We see applications of Liquid Crystal Displays (LCDs) in our daily lives like our Smartphones, Tablets, Laptops, and countless other devices. But behind it, there's a fascinating world of LCD technology, with COB and COG being two main technologies. Let's discuss the key differences between these technologies to understand their unique strengths and applications.

COB (Chip-on-Board) and COG (Chip-on-Glass) are two types of LCD modules that differs in how the driver chip is positioned.

What is COB LCD Technology?

The “COB” stands for “Chip on Board” technology which is a lighting technology which makes use of light-emitting diodes (LCDs). 

In SMD (Surface Mount Device) technology, beads are soldered onto the PCB whereas the COB process involves covering the silicon placement point with thermally conductive epoxy resin on the surface of the substrate. And the LCD chip is fixed to the interconnected substrate using conductive or non-conductive adhesive via adhesive or solder. Because of this chip establishes electrical connectivity with the PCB board through lead bonding.

The COB packaging process represents a modern way from traditional packaging technologies reliant on brackets and supports, thereby reducing the number of soldering points.

This eliminates the need for traditional ribbon cables or connectors, streamlining the assembly process and reducing the overall size of the display module.

You May Also Like To Read: Pros and Cons of COB LCD Technology

COB displays are compact and cost-effective, but may have lower resolution than other technologies. COB modules are durable and robust, making them ideal for high-reliability applications.

Lets Understand What is COG Display

                 COG (Chip on Glass) Display

In traditional LCD modules, the LCD driver is usually situated on a PCB which is located behind the module, this increases the display's overall thickness. Connection to the drive is established using either fixed pins or elastomer connectors. These connectors need multiple bonds for each drive input to the LCD. LCDs typically demand multiple drive inputs (even with multiplex drive techniques), the quality of these bonds significantly impacts reliability.

In contrast, COG modules position the LCD driver directly onto an overlapping edge of one of the glass plates composing the LCD. This makes the display less than 3 mm thick, where all connections from the LCD driver to the LCD are totally shielded from the external surrounding. With COG modules, each connection requires only a single bond, ensuring optimal reliability of the module.

This eliminates the need for a separate PCB, resulting in incredibly thin and lightweight displays.

COG displays are smaller, more cost-effective, and highly customizable than typical LCD modules. They also have improved image quality and lower power consumption. COG modules are thinner and more compact than COB modules, and are often used in portable machines and handheld products. 

COG technology is often preferred for applications where space constraints are critical, such as in handheld devices and automotive displays.

Difference Between COB and COG Technology

Choosing between COB and COG

The choice between COB and COG depends on your development and application needs:

For Ruggedness and Reliability in remote conditions COB should be your choice.

For Thinness and Sleekness and stylish design COG should be your go to choice.

By understanding the different characteristics and features of COB and COG technologies, you can make good decisions when building the ideal LCD solution for your project.

Conclusion

Thus we have discussed above in detail the difference between the COB and COG LCD Technology. COB offers simplicity and cost-effectiveness, while COG provides compactness and enhanced reliability. By understanding these differences designers and engineers can make better decisions based on the specific requirements of their projects. Whether it's optimizing space, improving reliability, or managing costs, choosing the right LCD technology is essential for achieving success in display-based applications.

If you are building an IOT device and looking for COB or COG LCD display from brands such as Sinda , Nextion, Abilton to incorporate in your project then reach out to us today, we are the best electronic components online store Campus Component.

Among the most popular LCD display technology COG i.e chip on glass LCD displays are used in various applications and different industries on large scale. The COG displays are compact in size, have high resolution and are cost effective. In this blog post, we will discuss the COG LCD technology focused on their Pros and Cons.

Lets Understand What is COG Display

COG (Chip on Glass) Display

In contrast, COG modules position the LCD driver directly onto an overlapping edge of one of the glass plates composing the LCD. This makes the display less than 3 mm thick, where all connections from the LCD driver to the LCD are totally shielded from the external surrounding. With COG modules, each connection requires only a single bond, ensuring optimal reliability of the module.

Lets see specifications of COG LCD module display available at our Campus Component Store.

128X64 (S) COG White Display Small Size:

Our 128X64 (S) COG White Display, designed for professional industrial applications, offers a compact monochrome LCD solution. Ideal for a range of industries, including digital panel meters, UPS systems, inverters, multi-function meters, POS machines, fuel dispensers, oil dispensers, gas dispensers, flow meters, KWH meters, energy meters, water meters, gas meters, smart meters, and clocks, our COG Graphic LCD Module 128*64 comes in various models ready for use or can be customized to meet specific requirements. We offer flexibility in interface options such as I2C and Serial, and provide a range of font choices to suit your needs.

128X64 (S) COG White Display Small Size Features:

• LCD Type: FSTN, Positive Transflective

• Operating Voltage: Vdd- 3V

• Viewing Direction: 6 O'clock

• Drive Method: 1/65 Duty, 1/9 Bias

• Operating Voltage: -20c to +70c

• Storage Temp: -30C to +80C

• Connector Type: COG+20Pin

• Driver IC: ST7567S

• Backlight: White

128X64 (S) COG White Display Small Size Specifications:

Model No: SDGG12864-58

Outline Dimension(mm): 63.20x41.70x5.10

Viewing Area(mm): 50.00x25.00

Color available: Grey, Yellow-green, Blue

IC: ST7567

IC Package: COG

Interface: Parallel/SPI

Now let's discuss the Pros and Cons of COG LCD Technology.

Pros of COG LCD Technology

1. High Resolution

COG LCD modules have exceptional resolution capabilities, guaranteeing a sharp and smooth display of information. Through technological advancements, these modules achieve high pixel densities, enabling the complex details and maximizing the user experience.

2. Wide Viewing Angle

COG LCD modules offer a broader viewing angle, this ensures that displayed content remains visible from various angles. This feature has applications requiring multiple users to view the display simultaneously, such as public information displays and automotive dashboards.

3. Cost-Effective

COG LCD modules stand out in the market for their low cost availability. Because the driver IC onto the glass substrate reduces overall manufacturing costs, making them an economical choice for various industries. Their affordable cost makes them well-suited for large-scale production and mass-market applications.

4. Compact Design

A standout feature of COG LCD modules is their compact design. By integrating the driver IC directly onto the glass substrate, the need for additional PCBs is eliminated, resulting in a thinner and lighter display module. This feature makes them suitable for space-limited applications such as portable devices and wearables.

5. Low Power Consumption

COG LCD modules have minimal power consumption, this makes them exceptionally energy-efficient. This feature proves particularly advantageous for battery-operated devices, as it long battery life and maximizes the overall user experience.

6. Enhanced Reliability

The direct integration of driver ICs onto the glass substrate enhances the display’s robustness and reliability by reducing the number of external components which are responsive to environmental factors and mechanical stress. This benefits in improved resistance to shock, vibration, and temperature variations, making COG LCDs suitable for complex applications.

Cons of COG LCD Technology

1. Restricted Customization Options

COG LCD modules have limited flexibility for customization. The integration of the driver IC onto the glass substrate limits the ability to change the module's layout or add additional components. This limitation may present challenges for applications which require specific design modifications or additional functionalities.

2. Responsive to Mechanical Strain

Due to their compact size and direct integration of the driver IC onto the glass substrate, COG LCD modules are more vulnerable to mechanical stress. Excessive bending or pressure can cause damage to the delicate components, which may result  in display malfunctions or complete failure. Careful handling and protective measures are important to handle these displays.

3. Restricted Operating Temperature Range

COG LCD modules have a restricted operating temperature range compared to alternative display technologies. Extreme temperatures can adversely affect the module's performance and longevity, this makes it less suitable for applications requiring operation in harsh environmental conditions.

4. Complex Manufacturing Process

The integration of driver ICs directly onto the glass substrate is a complex manufacturing process involving precise alignment, bonding, and testing procedures. This complexity leads to higher production costs and longer lead times, making COG LCDs less economical for low-volume production runs.

5. Limited Scalability

While COG LCD technology offers significant advantages in terms of compactness and reliability, it may not be easily scalable for larger display sizes due to the constraints by the integration of driver ICs onto the glass. This limits its applicability in certain markets requiring large displays such as televisions and digital boards.

Also Read: The Pros and Cons of COB LCD Technology

Conclusion

Thus above we discussed multiple aspects about COG LCD Technology and their pros and cons. Understanding these pros and cons is important while selecting the proper display technology for your applications. In conclusion, for industrial, automotive, and portable equipment devices, integrating COG LCD modules into your projects serves as an excellent choice. These modules offer significant advantages over traditional LCD modules with packaged LCD drivers. With their thinner and compact size, enhanced reliability, flexibility, and cost-effectiveness, COG modules present a good solution for diverse display requirements. 

Thus using COG LCD technology can optimize performance in various applications.

If you are looking for a COG LCD Display then Campus Component is your one stop solution for electronic components online where you can get COG displays from top brands like Sinda and many more.

In this article we will discuss in detail on the PROS and CONS of COB LCD Technology. So lets understand what COB LCD Technology is and how it is good to include in your project development. The demand for advanced display technologies is continuously rising. Among the various options available, Chip-on-Board (COB) LCD technology stands out as a promising solution for varied types of applications.

What is COB LCD Technology?

The “COB” stands for “Chip on Board” technology which is a lighting technology which makes use of light-emitting diodes (LCDs). 

In SMD (Surface Mount Device) technology, beads are soldered onto the PCB whereas the COB process involves covering the silicon placement point with thermally conductive epoxy resin on the surface of the substrate. And the LCD chip is fixed to the interconnected substrate using conductive or non-conductive adhesive via adhesive or solder. Because of this chip establishes electrical connectivity with the PCB board through lead bonding.

The COB packaging process represents a modern way from traditional packaging technologies reliant on brackets and supports, thereby reducing the number of soldering points.

Understanding COB LCD Technology

COB LCD technology involves mounting the integrated circuit directly onto the glass substrate, eliminating the need for a separate PCB (Printed Circuit Board). This compact design enhances reliability, reduces manufacturing costs, and facilitates miniaturization, making it an appealing choice for numerous electronic devices and integrated displays.

Features of COB LCD Technology

1. Ultra-micro pitch.

2. Ultra-clear display screen.

3. Lighter and thinner box compared to small-pitch LCDs.

4. Strong heat dissipation with small thermal resistance value.

5. Reduce moiré effect, offering superior visual experience.

6. Inconsistent screen color consistency due to small spacing.

7. Modern packaging methods utilized.

Pros of COB LCD Technology

Enhanced Reliability: The direct attachment of the integrated circuit onto the glass substrate minimizes the risk of connectivity issues and enhances overall reliability. This robust construction makes COB LCD displays ideal for applications requiring long-term durability, for example in automotive instrumentation and industrial control panels.

Space Efficiency: COB LCD technology enables a compact design, making it suitable for devices with limited space constraints. It has a small footprint and simplified assembly process helps in creation of sleek, lightweight products without compromising functionality.

Energy Efficient: COB LCDs have enhanced energy efficiency levels. This advantage comes from the distinctive configuration of COB LCD chips. If your aim is to conserve energy, then COB LCD is the best choice for you.

Customization Options: Manufacturers have flexibility in customizing COB LCD displays to meet customer requirements. From varying screen sizes and resolutions to integrate additional features like touch pads or backlighting, COB technology allows for giving solutions made for diverse applications.

Effective Heat Management: Every LCD produces heat during operation. COB LCDs excel in managing heat efficiently. Their design allows for the flow of generated heat across the module, and also the heat sinks increase thermal regulation. This eventually increases the lifespan of LCD.

Cons of COB LCD Technology

High Cost: There are multiple features COB LCD offers but that come with a higher price compared to traditional LCD options. From manufacturing to packaging and beyond, these LCDs hold a higher cost.

Limited Scalability: While COB technology goes perfect in compact applications, it is not suitable for larger displays due to scalability limitations. As the size of the display increases, the challenges associated with precise circuit placement and thermal management rises, affecting the performance and reliability.

Complex Repair Process: Repairing COB LCD displays is more challenging compared to traditional modules. The integrated circuit which is directly attached to the glass substrate requires specialized equipment and expertise, making repairs potentially more costly and time-consuming.

Susceptibility to Damage: Despite their enhanced reliability, COB LCD displays are more susceptible to damage from mechanical stress or environmental factors. Mishandling during installation or operation can lead to cracked substrates or detached integrated circuits.

Limited Supply Chain Options: Due to the specialized nature of COB technology, manufacturers may face limited options in terms of suppliers and components. This dependency on specific vendors can be challenging in terms of supply chain management and procurement, this impacts production schedules and costs.

Maintenance Difficulties: Repairing LCDs in a COB display has complexities due to the integrated nature of the LCDs and circuits. This can lead to higher repair or replacement costs compared to SMD displays.

Applications of COB LCD Display

Milk Analyzer: COB LCDs are used in an ultrasonic milk analyzer based on the measurement of sound velocity through a milk sample. 

Automotive Applications: It is also well-suited for automotive applications enhancing visibility. Their brightness and compact design make them a preferred choice

Weighing Machine: COB Displays are used in a weighing machine that displays the mass of the body by measuring the weight of the body.  COB LCDs provide a dependable display solution when reliability and long-lasting performance matters most.

Medical Applications: COB Displays are also used in medical applications including Oxymeter, X-ray device, Angiography device, Blood storage cabinet etc.

COB LCD Display: 16x4(S) COB White/Black Backlight

16x4(S) COB White/Black Backlight Features:

• LCD Type: STN- Positive Transflective

• Duty: 1/16 and Bias 1/5

• Viewing Angle: 6 O'clock

• Operating Temperature: -20 to + 70C

• Storage Temp: -30 to +80c

• Driver IC: ST7066U

• Drive Power: Vdd: 5V

Conclusion

COB LCD technology offers multiple advantages for high-resolution displays, particularly in terms of picture quality, contrast, and durability. By carefully considering the pros and cons, you can determine if COB LCD technology is the right choice for your specific needs. Because of increasing applications and development in the Internet of Things, the need for LCD displays is going to increase in the coming future. If you are going to select a LCD Display for your project, consider the COB LCD.

Waveshare provides cutting-edge electronic displays, modules, and accessories. Waveshare displays are renowned for their expertise display designs, Waveshare comes with a wide range of display solutions like LCD displays, OLED displays, e-paper displays, TFT displays, touchscreens, and many more display modules tailored for diverse applications. 

Waveshare Displays are versatile and user-friendly display modules that can be easily integrated into various projects. These displays come in different sizes and types, offering crisp and vivid visuals for applications ranging from DIY electronics to industrial projects. Whether you are a hobbyist, a developer, or a tech enthusiast, understanding how to use the power of Waveshare Displays can open up a world of possibilities for your projects.

In this blog we will explore in depth features of some waveshare displays that will help you take your project to the next level.

1. Waveshare 1.44inch LCD HAT

The ST7735S, a robust 132x162 pixel LCD controller, is a key component of the 1.44-inch LCD HAT, giving a pixel resolution of 128x128. This LCD supports 8-bits, 9-bits, 16-bits, and 18-bit parallel interfaces, accommodating RGB444, RGB565, and RGB666 color formats. This LCD comes with a 4-wire SPI interface, effectively reducing the required GPIO while significantly boosting communication speed. This strategic design ensures a smoother and faster data exchange, elevating the overall user experience.

Specification:

• Operating voltage: 3.3V

• Interface: SPI

• LCD type: TFT

• Controller: ST7735S

• Resolution: 128*128 (Pixel)

• Display size: 25.5*26.5（mm）

• Pixel size: 0.129(W)*0.219 (H)(MM)

• Dimension: 65 x 30.2 (mm)

2. Waveshare 10.1inch HDMI LCD (B) (with case)

Specifications of Waveshare 10.1inch HDMI LCD:

• Comes with 10.1” size

• Resolution of 1280*800

• HDMI Display Interface

• IPS display panel

• Viewing angle of 170 degree

• Capacitive touch type

• Low power consumption

• Acrylic Enclosure

• Works with Raspberry Pi, supports Raspberry Pi OS / Ubuntu / Kali and Retropie.

• Supports Windows 11/10/8.1/8/7.

3. Waveshare 2.23inch OLED HAT

Waveshare 2.23-inch OLED display, equipped with an integrated controller for seamless functionality. Can be easily integrated with raspberry pi through the 40 PIN pin header. Alternatively, for compatibility with other hardware platforms you can utilize the I2C and SPI interfaces. The default interface for the 2.23-inch OLED HAT is SPI, ensuring straightforward connectivity. You can easily choose I2C by a simple modification– just solder the resistors on the back of the OLED to make the switch. This flexibility empowers you to effortlessly adapt the OLED display to suit your specific project requirements.

Specifications of 2.23inch OLED HAT:

• Controller: SSD1305

• Interface: SPI/I2C/OLED

• Resolution: 128 * 32

• Display size: 2.23inch

• Pixel size: 0.41mm x 0.39mm

• Display color: White

• Working voltage: 3.3V

• Working temperature: -40~70℃.

4. Waveshare 1.3" LCD Display Module /Pico-LCD-1.3

Specifications of Waveshare 1.3" LCD Display Module:

• Raspberry Pi Pico Header Compatibility with Onboard Female Pin Header For Direct Attaching To Raspberry Pi Pico.

• Supply Voltage: 2.6V~5.5V

• Operating Current: 40mA

• IPS screen type

• 240x240 Pixels resolution

• 65K RGB colors, clear and colorful displaying effect

• SPI interface, requires minimal IO pins

• 1x joystick and 4x user buttons for easy interacting

• Comes with development resources and manual (Raspberry Pi Pico C/C++ and MicroPython examples)

5. Waveshare 2.13″ E-Paper HAT (B)

The E-paper display comes with the revolutionary Microencapsulated Electrophoretic Display (MED). At its core, this innovation creates the charged color pigments, suspended within transparent oil, and responsive to electronic charges. The Waveshare 2.13″ E-Paper HAT screen showcases patterns by reflecting ambient light, eliminating the need for a background light source. Also, under ambient light conditions, the E-paper screen gives exceptional visibility, offering a wide viewing angle of 180 degrees. Because of this distinctive feature it is the premier choice for E-reading enthusiasts, providing an optimal and glare-free reading experience.

Specifications: 

Dimensions: 2.13 inch

Driver Board Dimensions: 65mm × 30.2mm

Display Dimensions: 48.55mm × 23.71mm

Outline Dimensions (screen only): 59.2mm*29.2mm*0.98mm

Operating Voltage: 3.3V / 5V (5V is required for power and signal)

Communication Interface: SPI

Dot Pitch: 0.194mm × 0.194mm

Resolution: 250 × 122

Display Color: Black, White, Red

Grey Scale: 2

Refresh Time of: 15s

Refresh Power: 26.4mW

Standby Current: < 0.01uA (almost 0).

Conclusion

Thus we have seen multiple displays features offered from waveshare, Using Waveshare Displays provides a seamless and enhanced visual experience for your projects. With high resolution and vibrant display capabilities, these screens offer clarity and precision. Depending on your device's compatibility, you can connect your Waveshare Display using an HDMI cable for a direct digital interface or GPIO pins for customized integration. Additionally, Waveshare Displays are compatible with a wide range of devices and modules like Raspberry pi, Arduino, ESP32, ESP8266, Nuvoton, and many more, making them a versatile choice for both beginners and experienced users. 

If you are looking for a display device for your project from brands like Waveshare then reach out to us at Campus Component- the best electronic components online store today!

Working on low-power embedded or IOT applications could become a bit challenging. They always need keen attention at all stages to keep power consumption the lowest possible because the device you are building should run for maximum time.

One of the most power-hungry components in your embedded/IOT could be the displays if your product has it. So, it is important to understand the power consumption of various displays before you select one. Whether you're tinkering with gadgets or diving into IoT projects, knowing about TFT, OLED, and Glass displays is important. Let's break down the basics and learn how to pick displays that won't drain our device's battery. In this article we will see how Power consumption differs from displays such as TFT, OLED, and Glass display(HDMI).

TFT Displays

TFT displays typically use TN (Twisted Nematic) type LCD technology, making them active-matrix LCDs. Active-matrix LCDs allow holding back some pixels while using others, ensuring the display operates with minimal energy consumption. TFT LCDs contain capacitors and transistors, crucial elements that contribute to the efficient functioning of the display. These components play a key role in utilizing a very small amount of energy, preventing the display from running out of operation. When we mention TFT LCD panels or screens, we're essentially referring to TN (Twisted Nematic) Type TFT displays. TFT, standing for active-matrix LCDs, represents a specific category within LCD technologies.

TFT displays boast wider viewing angles and a better contrast ratio compared to TN displays. This technology has found extensive use in various applications, including computer monitors, laptops, medical monitors, industrial displays, ATMs, and point-of-sale systems. In essence, TFT technology thrives on its active-matrix LCD characteristics, offering improved performance and versatility across a range of electronic devices. The power consumption of tft displays is composed of lcd panel, led backlit and touch screen, among which the power consumption of led backlight takes more than 90% of the whole tft screen, especially the high-brightness display module.

OLED Displays

OLED displays stand apart as emissive display technology, distinguishing themselves from LCDs. Each illuminated dot on the OLED display creates a small, bright area with glowing phosphor, contributing to its unique visual appeal. OLED displays are renowned for their exceptionally high contrast, making them a preferred choice for high-end applications. Some of the most sophisticated TVs and mobile phones feature AMOLED (Active Matrix Organic Light Emitting Diodes) displays, emphasizing their premium status. OLED technology surpasses LCD in various aspects, offering better color reproduction, image quality, and a broader color gamut.Importantly, OLED displays consume less power compared to LCD technology.

OLED encompasses both AMOLED and PMOLED (Passive Matrix Organic Light Emitting Diodes). When choosing for TVs and mobile phones, opting for AMOLED is recommended over PMOLED for enhanced performance. For those with a bit more budget, incorporating a touch screen into the display is an option. All these technologies are part of the family of Flat Panel Displays, distinguishing themselves from the bulky, heavy, old-fashioned, and expensive CRT (Cathode-Ray Tube) displays.

OLED and AMOLED displays consume more power as you turn more pixels on. This is because each pixel is composed of three tiny LEDs (four in some LG TVs), which emit their own light. With every pixel off, the display will only draw enough current to keep the controller chip running. The chip itself only needs a few milliamps.

In summary, OLED displays bring futuristic charm to visual experiences, offering superior contrast, vibrant colors, and energy efficiency. Whether you're choosing between AMOLED and PMOLED or contemplating touch screen integration, understanding OLED technology opens doors to cutting-edge display solutions.

Glass Displays

Actually, Glass display technology is a kind of TFT display with thin film transistors for individual pixels. But Glass displays have superior high contrast, wide viewing angle, color reproduction, image quality etc. Glass Display screens have been found in high-end IOT and Embedded applications, like manufacturing industries, cars, mobile phones, EV Vehicles, etc. 

Both TFT LCD displays and Glass displays are active matrix displays, neither of them can produce color, there is a layer of RGB (red, green, blue) color filter in each LCD pixel to make LCD showing colors. LED backlights are usually together with them in the display modules as the light sources. Besides, both TFT screens and Glass display screens are transmissive, it will need more power or more expensive than passive matrix LCD screens to be seen under sunlight.

Glass Display screens transmittance is lower than TFT screens, lower power is needed for Glass display displays compared to TFT displays.

Conclusion

As we discussed above, the conclusion is if you need the lowest power consumption, OLED and glass LCDs are the best. Also you must have a power gating mechanism to reduce further power when the display is not in use. Understanding the power consumption parameters of TFT, OLED, and Glass displays is crucial for choosing a perfect display. Whether you prioritize energy efficiency, visual quality, or a balance of both, the right display technology can enhance user experience while minimizing environmental impact.

If you are building an IOT or Embedded device and looking for displays which can save your power consumption, We at Campus Component- electronic components shop pune, provide displays from popular brands such as Sinda, Nextion and DWIN to incorporate in your project.

In this article we will interface Nextion Display with ESP32, we will see how to configure the display for the first time, download the needed resources, and how to integrate it with the ESP32 microcontroller board. The Nextion display is a powerful Human Machine Interface (HMI) solution that lets you create interactive graphical user interfaces (GUIs) for your embedded projects. When combined with the ESP32 microcontroller, you can develop user-friendly interfaces for various applications, including IoT devices, automation projects, and data visualization dashboards.

Hardware & Software Requirements to Interface Nextion Display with ESP32

Hardware:

• ESP32 Dev Board (e.g., ESP32-WROOM-32)

• Nextion Display

• Jumper wires

Software:

• Nextion Editor

• Arduino IDE 

Nextion Display Setup

Nextion Editor is a development software used for visual building of graphic interface for embedded/IOT/GUI-intensive devices with various types of TFT displays and Touch Panels. Using this software, we can start creating user interfaces for TFT based devices in a faster and easier way.

You can download Nextion Editor from this link

https://nextion.itead.cc/resources/download/nextion-editor/

After downloading the editor install the nextion editor .

Nextion Editor General Overview

Here’s a quick overview of the different sections of the Nextion Editor.

1. Main Menu

2. Canvas – this is where you add your components to build the User Interface.

3. Toolbox – this is where you have a wide variety of components you can add to the user interface, like pictures, progress bar, buttons, sliders, and much more.

4. Picture/Fonts list – this shows the fonts and pictures imported to your projects. Here you can also add new fonts and pictures.

5. Page area – you can manage your pages here, like add more pages, copy and delete pages.

6. Attributes area – this part shows your component’s attributes. You can edit the component’s attributes here.

7. Compiler output window – this will show any errors occurred during compiling.

8. Event window – here you can add code to be run when an event is met.

Interfacing ESP32 with Nextion Display

• Connect the Nextion display to the ESP32:

• Connect the TX pin of the Nextion display to the RX pin of the ESP32 (e.g., ESP32 Tx0 to Nextion Rx).

• Connect the RX pin of the Nextion display to the TX pin of the ESP32 (e.g., ESP32 Rx0 to Nextion Tx).

• Use the jumper wires to connect the GND pins of both devices.

Configure the Nextion display:

• Open the Nextion Editor and create a new project.

• Select the model of your Nextion display.

• Design your desired interface using the built-in components like buttons, text boxes, images, and progress bars.

• Assign unique IDs to each component for interaction with the ESP32 code.

Example User Interface designed in Nextion Editor:

The above image shows the connection diagram of ESP 32 wifi four relay board with the nextion display.From the ESP 32 board J1 and J2 connect 5v and Ground(G) to the nextion display as show below.Connect Tx of nextion to the Rx0 of the ESP32 board and Rx of nextion to the Tx0 of the ESP32 board .This will establish Uart communication.

Example Code to Show Temperature, Humidity and State of Button on Nextion Display

#include "Nextion.h"

#include "DHT.h"

#define DHTPIN 4     // what digital pin we're connected to

// Uncomment whatever type you're using!

#define DHTTYPE DHT11   // DHT 11

//#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Initialize DHT sensor.

DHT dht(DHTPIN, DHTTYPE);

// LED pins

const int led1 = 8;

const int led2 = 9;

// Declare your Nextion objects - Example (page id = 0, component id = 1, component name = "b0") 

NexText tState = NexText(0, 4, "tState"); 

NexButton bOn = NexButton(0, 2, "bOn");

NexButton bOff = NexButton(0, 3, "bOff");

NexSlider h0 = NexSlider(0, 5, "h0");

NexText tSlider = NexText(0, 6, "tSlider");

NexText tTempC = NexText(1, 5, "tTempC");

NexText tTempF = NexText(1, 4, "tTempF");

NexProgressBar jHumidity = NexProgressBar(1, 8, "jHumidity");

NexText tHumidity = NexText(1, 9, "tHumidity");

NexButton bUpdate = NexButton(1,10, "bUpdate");

// Register a button object to the touch event list. 

NexTouch *nex_listen_list[] = {

 &bOn,

 &bOff,

 &h0,

 &bUpdate,

 NULL

};

/*

 * Button bOn component pop callback function. 

 * When the ON button is released, the LED turns on and the state text changes. 

 */

void bOnPopCallback(void *ptr) {

 tState.setText("State: on");

 digitalWrite(led1, HIGH);

}

/*

 * Button bOff component pop callback function. 

 * When the OFF button is released, the LED turns off and the state text changes. 

 */

void bOffPopCallback(void *ptr) {

 tState.setText("State: off");

 digitalWrite(led1, LOW);

}

/*

 * Slider h0 component pop callback function. 

 * When the slider is released, the LED brightness changes and the slider text changes. 

 */

void h0PopCallback(void *ptr) {

 uint32_t number = 0;

 char temp[10] = {0};

 // change text with the current slider value

 h0.getValue(&number);

 utoa(number, temp, 10);

 tSlider.setText(temp);

 // change LED brightness

 analogWrite(led2, number); 

}

/*

 * Button bUpdate component pop callback function. 

 * When the UPDATE button is released, the temperature and humidity readings are updated. 

 */

void bUpdatePopCallback(void *ptr) {

 // Reading temperature or humidity takes about 250 milliseconds!

 // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)

 float h = dht.readHumidity();

 // Read temperature as Celsius (the default)

 float t = dht.readTemperature();

 // Read temperature as Fahrenheit (isFahrenheit = true)

 float f = dht.readTemperature(true);

 // Check if any reads failed and exit early (to try again).

 if (isnan(h) || isnan(t) || isnan(f)) {

 return;

 }

 // Update temperature in Celsius

 static char temperatureCTemp[6];

 dtostrf(t, 6, 2, temperatureCTemp);

 tTempC.setText(temperatureCTemp);

 // Update humidity percentage text and progress bar

 char hTemp[10] = {0}; 

 utoa(int(h), hTemp, 10);

 tHumidity.setText(hTemp);

 jHumidity.setValue(int(h));

 // Update temperature in Fahrenheit

 static char temperatureFTemp[6];

 dtostrf(f, 6, 2, temperatureFTemp);

 tTempF.setText(temperatureFTemp);

}

void setup(void) { 

 dht.begin();

 Serial.begin(9600);

 // You might need to change NexConfig.h file in your ITEADLIB_Arduino_Nextion folder

 // Set the baudrate which is for debug and communicate with Nextion screen

 nexInit();

 // Register the pop event callback function of the components

 bOn.attachPop(bOnPopCallback, &bOn);

 bOff.attachPop(bOffPopCallback, &bOff);

 h0.attachPop(h0PopCallback);

 bUpdate.attachPop(bUpdatePopCallback, &bUpdate);

 // Set LEDs as outputs

 pinMode(led1, OUTPUT);

 pinMode(led2, OUTPUT);

}

void loop(void) { 

 /*

 * When a pop or push event occured every time,

 * the corresponding component[right page id and component id] in touch event list will be asked.

 */

 nexLoop(nex_listen_list);

}

Working of the Project

Once the hardware is connected and the software is programmed, the ESP32 communicates with the Nextion display through serial communication. The ESP32 sends commands to the display, telling it what to display and how to respond to user input. The Nextion display then updates its GUI and sends back any user interactions to the ESP32 for further processing.

You May Also Like To Read: AT Commands, Call and SMS Using A7672S 4G GSM with Nuvoton Microcontroller

Conclusion

In this post we have seen the interfacing of Nextion display with ESP32, following the above tutorial you can explore multiple dimensions of Nextion Display and as well of ESP32. Nextion is a great display that makes the process of creating user interfaces simple and easy. Campus Component offer a diverse range of components to fuel your innovation. If you're ready to elevate your projects with the seamless synergy of Nextion Displays and ESP32, and many other electronic components, visit Campus Component today and buy electronic components online in India.

OLED (Organic light emitting diodes) are a type of display technology that is rapidly gaining popularity in a variety of applications including embedded systems, IOT, smart wearables, smartphones. OLED displays offer many advantages over  LCD displays. OLED has revolutionized the way we interact with screens on various devices. In this blog, we'll discuss OLED displays, their advantages, and applications.

What is OLED?

The acronym ‘OLED’ stands for Organic Light-Emitting Diode. OLED is a technology that uses LEDs in which the light is produced by organic molecules. OLED displays are made by placing a series of thin organic films between two conductors. When an electrical current is applied, a bright light is emitted. 

OLEDs make use of emissive displays, allowing each pixel to be individually controlled and emit its light, in contrast to LCDs that work on a backlighting unit. This feature of OLED displays results in excellent image quality, vivid colors, rapid motion response, and high contrast. Another advantage of the uncomplicated design of OLEDs, this makes it easy to produce flexible and transparent displays.

Advantages of OLED Displays

• Flexible and Thin: OLED displays can be made to be flexible and thin, which makes them ideal for applications such as wearables and curved and small displays.

• Faster Response Times: OLED pixels have faster response times than LCD pixels, reducing motion blur in fast-paced scenes, which is especially beneficial for gaming and sports enthusiasts.

• Wider Viewing Angles: OLED displays maintain their picture quality at wider viewing angles, ensuring a consistent visual experience for viewers from various positions.

• Improved Image Quality: OLED displays offer superior contrast, brightness, and viewing angles compared to LCD displays. This is because OLED displays emit their own light, rather than relying on a backlight.

• Thinner and Lighter: OLED displays are significantly thinner and lighter than LCD displays. This is because OLED displays do not require a backlight or polarizer, which are two of the major components of LCD displays.

• Lower Power Consumption: OLED displays consume significantly less power than LCD displays. This is because OLED displays only emit light when they are being activated, which means that they can be turned off when they are not being used.

Applications of OLED Displays

• Consumer Electronics: OLED displays are commonly used in smartphones, tablets, laptops, and smartwatches, enhancing the user experience with vibrant colors and sharp images.

• Television and Monitors: High definition televisions and monitors use OLED technology to deliver superior picture quality, captivating viewers with lifelike images.

• Automotive: OLED displays are increasingly finding their way into the automotive industry, dashboards, infotainment systems, and rear lights, providing both aesthetic appeal and functionality.

• Lighting: OLEDs are also used in lighting solutions, offering soft, diffused lighting that can be taken use into various designs and shapes.

Lets See Some Features of Available OLED Displays from Campus Component

1. 0.96 inch OLED Display -AR-826-D

0.96 inch OLED display Features:-

• Display Type: OLED

• Dot Matrix: 128x64

• Dot Size: 0.154mm * 0.154mm

• Dot Pitch: 0.17 * 0.17 mm

• Aperture Rate : 78%

• Active Area : 21.744 * 10.864mm

• Driver IC: SSD1306

2. 2.8" DWIN Smart Capacitive Touch Screen Display DMG32240C028_03WTC- LC-2849-D

The DMG32240C028 2.8" Smart Capacitive Touchscreen Display can easily be interfaced with microcontrollers & controller boards like Arduino Uno, Arduino Nano, Arduino Mega, ESP8266, ESP32, PIC Microcontrollers, 8051 family of microcontrollers, etc.

2.8” Smart Capacitive Touch screen Display DMG32240C028_03WTC Features:-

• Size: 2.8"

• Touch Type: Capacitive

• Resolution: 320x240

• Grade: Commercial

• Color: 262K Colors; 18 Bit

• Dimensions: 85.2 mm (W) x 55.6 mm (H) x 11.65 mm (T)

• Backlight: LED

• Brightness: 200 nit

• Operating Voltage: 5 Volts

• Operating Current: 40ma to 105ma

• Working Temperature: -20 to 70°C

3. OLED 0.91 Inches 128X32-LC-585-D

OLED 0.91 inches 128*32 – LC – 585 – D Features:-

• 0.91inch small form factor

• 128x32 high resolution

• I2C interface, requires only two signal pins

• Driver: 1306

• Interface: I2C

• Display color: White

• Resolution: 128x32

• Viewing angle: >160°

• Operating voltage: 3.3V / 5V

Conclusion

OLED display is a promising new display technology that offers a number of advantages over traditional LCD displays. As OLED technology continues to develop and more applications come in, it's become easier for developers to rely on an OLED display because of features offered at lower price.

If you are building an IOT device and looking for OLED display from brands such as Sinda, Nextion, Abilton to incorporate in your project then reach out to us at Campus Component today!

What’s Nextion

Nextion is a Human Machine Interface（HMI)solution combining an onboard processor and memory touch display with Nextion Editor software for HMI GUI project development.

Using the Nextion Editor software, you can quickly develop the HMI GUI by drag-and-drop components (graphics, text, button, slider, etc.) and ASCII text-based instructions for coding how components interact on the display side.

Nextion HMI display connects to peripheral MCU via TTL Serial (5V, TX, RX, GND) to provide event notifications that peripheral MCU can act on, the peripheral MCU can easily update progress, and status back to Nextion display utilizing simple ASCII text-based instructions.

Nextion displays are available in a variety of sizes and resolutions, and can be used for a variety of applications, such as industrial automation, home automation, etc,. It facilitates seamless integration with popular boards such as Arduino, Raspberry Pi, ESP8266, ESP32, and more.

In this blog post, we will walk you through the steps of getting started with Nextion displays. We will cover topics such as:

• Installing the Nextion Editor

• Creating a new project

• Adding elements to your project

• Programming your display

• Connecting your display to your device

By the end of this post, you will have a basic understanding of how to use Nextion displays and you will be able to create your own custom HMI projects.

• Installing the Nextion Editor

The first step is to download and install the Nextion Editor software. You can download the software from the Nextion website. 

Once the software is installed, open it and you will be presented with the following screen:

• Creating a New Project

To create a new project, click on the File menu and select New. This will open a new window where you can enter the name of your project and select the type of display you are using.

Once you have entered the project name and selected the display type, click on the Create button. This will create a new project file and open it in the Nextion Editor.

• Adding Elements to Your Project

Now that you have created a new project, you can start adding elements to your display. To do this, click on the Objects tab and drag and drop the elements you want to use onto the display canvas.

You can resize and reposition the elements as needed. To change the properties of an element, double-click on it. This will open the Element Properties window.

• Programming Your Display

Once you have added the elements you want to use, you can start programming your display. To do this, click on the Script tab and enter the code you want to use.

The Nextion Editor supports a variety of programming languages, including C, C++, and JavaScript. You can also use the built-in function library to access a variety of functions, such as reading and writing to the display, controlling the backlight, and more.

• Connecting Your Display to Your Device

To connect the display to the microcontroller there’s a need of some Hardware components:

The Hardware requirements include the Nextion display module, a power supply, a microcontroller or development board, and the necessary cables for connection. Ensure that you have the correct display model and check the documentation for any additional requirements.

Once you have programmed your display, you can connect it to your microcontroller. The type of connection you use will depend on the device you are using. For example, if you are using an Arduino, you will use the Arduino IDE to show the data on the display through arduino program..

Once the display is connected, you can start using it. To do this, you will need to send commands to the display using the Nextion Editor. The commands you need to send will depend on the code you have written.

For more information on using Nextion displays, please refer to the Nextion documentation.

Examples of Nextion Displays

Here are some examples of Nextion displays that you can use for your projects:

NX3224T028 2.8" HMI LCD Touch Display

• Operating Voltage: 5 to 7 Volt

• Operating current: 65mA

• Resolution:-320×240 pixel

• Flash memory: 4mb

• Ram: 3584byte 

NX8048T050 5.0" HMI TFT LCD Touch Display 

.

Specifications of NX8048T050 5.0" HMI TFT LCD Touch Display:-

• Operating Voltage: 5 to 7 Volt

• Operating current: 410mA

• Resolution:-800×480 pixel

• Flash memory: 16mb

• Ram: 3584byte 

NX8048P070-011C-Y 7.0" HMI Capacitive Touch LCD Display with Enclosure 

NX8048P070-011C-Y 7.0" HMI Capacitive Touch LCD Display Specifications:-

• Operating Voltage: 5 to 6.5 Volt

• Operating current: 750mA

• Resolution: 800×480 pixel

• Flash memory: 120mb

• Ram: 512kb

For more Nextion Displays and details visit CampusComponent!

Conclusion

Nextion displays are a versatile and affordable option for HMI displays. They are easy to use and can be programmed and connected with different microcontrollers. If you are looking for a HMI display for your next project, then Nextion is a good option to consider.

If you are interested in purchasing a Nextion display, then you can purchase from  Campus Component today! Campus Component is a leading supplier of Nextion displays and other electronic components. They offer a wide variety of Nextion displays to choose from and they have a team who will help you with your project.

Electronic displays that are utilized in computers, TVs, and smartphones include TFT and LCD. TFT can be found in a wide variety ranging from Graphics LCD display to 240*128 COG Displays by manufacturers like Sinda Display, and DWIN. Keep reading this blog to understand more about TFT vs LED which is better.

What is TFT?

 TFT represents a "Thin Film Transistor." These transistors are utilized in premium liquid crystal flat panel displays (LCDs). Each pixel on TFT-based displays has its own transistor. This makes the display brighter and depicts motion more smoothly by enabling the electrical current that illuminates the display to be turned on and off more quickly. TFT LCD Displays are referred to as "active-matrix" displays, which are superior to older "passive-matrix" LCDs in terms of quality. Therefore, a TFT AMLCD monitor is a "thin-film transistor active-matrix liquid crystal display" if you ever encounter one at your neighborhood computer store. In essence, it is a top-notch flat-screen display.

What is LED?

 Electrical equipment frequently uses light-emitting diodes (LEDs) as a conventional source of illumination. It can be used for a variety of things, including mobile phones and huge billboards for advertising. They are typically used in gadgets that display various forms of data and display time.

When an electric current passes through a semiconductor device called a light-emitting diode (LED), the LED emits light. An LED produces light when electricity passes through it due to the recombination of its electrons and holes. LEDs limit the direction that current can travel in and prevent it from going in the other direction.

P-n junctions in light-emitting diodes are highly doped. When forward-biased, an LED will emit a colored light at a certain spectral wavelength depending on the semiconductor material employed and the amount of doping. An LED is enclosed with a transparent cover, as seen in the image, to allow the light emitted to escape.

How Does TFT Display Technology Work?

 Liquid crystal material is sandwiched between two glass plates in a TFT LCD Display (Thin-Film-Transistor Liquid Crystal Display) technology. The precise amount of light that is permitted to pass and the colors that are produced are controlled by two polarizer filters, color filters (RGB, red/green/blue), and two alignment layers.

A transistor and capacitor are coupled with each pixel in an active matrix, allowing each sub-pixel to keep its charge rather than requiring an electrical charge to be transferred every time it has to be updated. Light flow is controlled by the TFT layer. The color is shown through a color filter, and your viewable screen is housed in the top layer.

 Utilizing an electrical charge to modify the molecular structure of the liquid crystal material to allow different backlight wavelengths to "pass-through". The TFT display's active matrix is constantly changing and refreshes quickly based on the signal received from the control device.

The underlying density (resolution) of the color matrix and TFT arrangement determine the pixels of TFT displays. Higher detail is possible with more pixels. The TFT displays are defined by the available screen size, power consumption, resolution, and interface (how to connect). The underlying density (resolution) of the color matrix and TFT arrangement determine the pixels of TFT displays. Higher detail is possible with more pixels. The TFT displays are defined by the available screen size, power consumption, resolution, and interface (how to connect).

The TFT screen requires a white, bright backlight to produce the image since, unlike OLED displays, it cannot emit light on its own. Modern panels generate their light using LED backlight (light emitting diodes), which by design uses less power and takes up less space. The TFT display screen, LED backlight, and drive circuits are all included in TFT display modules.

 What is the difference between TFT and LED?   

 TFT and LED screens both use LCD technology; the only distinction is in the backlighting. CCFL (cool compound fluorescent lamp) is used by TFT LCD Displays whereas LED is used for the other's backlight.

·        When compared to TFT, LED uses less power since, as you are probably aware, it uses significantly less power than a CFL. Additionally, the CCFL configuration would be in an array behind the screen to provide uniform illumination. As a result, it uses more energy.

·        In the case of LED monitors, LEDs are positioned next to the screen's edges.

·        The only negative effect of this would be that occasionally the corners would be brighter than the center. You might also believe that they use white LEDs, but in reality, they actually use blue LEDs that have been coated in phosphorous to appear white. The composition of this coating might fluctuate, which affects the color tone that different firms display.

Benefits and Uses of TFT LCD Displays

 TFT LCD displays from trusted manufacturers like Sinda Display, and DWIN provide a number of benefits over other display kinds (CRT, Plasma). Mobile phones, laptops, hang-on-the-wall LCD TVs, flat computer monitors, and other hand-held devices are all made possible by their lightweight, thin design, and energy efficiency. TFT LCDs at Campus Component by Sinda Display, DWIN are reasonably priced, making them popular in the display industry.

When we refer to an LCD kind, we mean either an Active TFT color display or a Passive Monochrome panel. Passive matrix LCD was widely utilized for many years prior to the development of TFT displays. Only monochrome displays, such as those on calculators, watches (not watches), thermostats (not Nest), utility meters, etc., can employ passive matrix LCD technology. The world is more colorful as a result of TFT LCD.

 Summary-

Overall, TFT panels are only used in low-end phones, such as feature phones and entry-level Android phones, despite the fact that they have certain clear advantages. TFT screens are rarely used in mid-range and high-end devices since plastic feels less pleasant to the touch than glass.

TFT technology will eventually be implemented on more expensive gadgets as it advances. TFT displays were utilized by Samsung in the midrange Galaxy A13 and Galaxy A23 models in 2022. Those improvements may already be taking place. The most common display type currently found in contemporary cell phones is LCD. Campus Component offers you a wide variety of TFT panels or displays from premium manufacturers like Sinda Display and DWIN, products you can find range from Graphics LCD displays, COB LCD Display, TFT displays, OLED display modules, 3/5/7-inch TFT Displays, 16*2 Character Display, 8*1 Character Display, 128*64 LCD Display 240*128 COG displays and more at the very top of the market.

TFT displays have components of greater quality than typical LCD displays. Compared to LCD panels, TFT displays are crisper, brighter, and refresh faster. Visit Campus Component today to place orders.

 Related Video-

https://www.campuscomponent.com/blogs/post/thing-to-know-before-buying-raspberry-pi-touch-screen-lcd

https://www.campuscomponent.com/blogs/post/advantages-of-touch-screen-displays-over-led-displays1