LCD Graphic 128 x 64 Display ST7920 12864B

Wiring Connections

• VCC: Connect to 5V power supply.
• GND: Connect to the ground of the system.
• RS (Register Select): Connect to the data/command selection pin of the microcontroller.
• RW (Read/Write): Connect to the read/write control pin of the microcontroller.
• E (Enable): Connect to the enable pin of the microcontroller.
• DB0-DB7: (For Parallel Mode) Connect to the data pins of the microcontroller.
• PSB: Connect to GND for SPI mode or to VCC for parallel mode.
• RST: Connect to the reset pin of the microcontroller.
• SDA: (For SPI Mode) Connect to the MOSI pin of the microcontroller.
• SCK: (For SPI Mode) Connect to the SCK pin of the microcontroller.

Power

The display operates at a standard 5V DC input. It is designed to be power-efficient,  consuming less than 25mA during operation. This low power requirement makes it ideal for projects where power conservation is a priority.

Input and Output

The ST7920 12864B display supports both parallel and SPI input methods. In parallel mode, it uses an 8-bit data bus, while in SPI mode, it requires only three pins (SDA, SCK, and PSB). The output is the graphical representation on the LCD screen, which can include text, images, and custom graphics depending on the project’s needs.

Physical Characteristics

The display module is compact, with dimensions  around 93mm x 70mm x 10mm. The active display area, which is 128 x 64 pixels, is approximately 72mm x 40mm. The module is lightweight and features mounting holes for secure attachment to your project’s enclosure. The screen itself is made of a durable material, with a green backlight that enhances visibility.

Technical Specifications

• Resolution: 128 x 64 pixels
• Controller: ST7920
• Interface: 8-bit parallel or SPI
• Operating Voltage: 5V
• Current Consumption: Less than 25mA
• Backlight: Green
• Dimensions: 93mm x 70mm x 10mm
• Viewing Area: 72mm x 40mm

Additional Features

The display module includes a built-in contrast adjustment feature, which can be controlled via software. This allows you to adjust the display’s visibility according to ambient lighting conditions. The ST7920 controller also supports Chinese and English fonts, which can be beneficial in multi-language projects. Furthermore, the module is compatible with various graphic libraries like U8g2, simplifying its integration into Arduino and other platforms.

How to Use

1. Wiring: Connect the VCC to a 5V power supply and GND to ground. Depending on your choice of interface, connect the appropriate pins (parallel or SPI) to your microcontroller.
2. Library Installation: Install the relevant graphic library in your development environment, such as U8g2 for Arduino.
3. Code Setup: Use the library functions to initialize the display and begin sending commands for text, images, or graphics.
4. Contrast Adjustment: Adjust the contrast via software commands or using the onboard potentiometer if available.
5. Testing: Upload your code to the microcontroller and observe the display output. Adjust the code to fit your project requirements.
6. Mounting: Secure the display in your project enclosure using the provided mounting holes. Ensure stable connections and avoid exposure to excessive heat or moisture.

The LCD Graphic 128 x 64 Display ST7920 12864B is a robust and flexible module that can enhance any project requiring a graphical display. Its dual interface capability and efficient design make it a valuable component for a wide range of applications.