Understanding LCD Module Circuit Principles
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Schematic Diagram
2. Definition of LCD Circuit Signals
VCOM: Voltage 10V
VDD: Digital Power
REST: Reset
STBYB:
GND: Ground
RXIN0-: LVDS Differential Data Input
RXIN0+: LVDS Differential Data Input
RXCLKIN-: LVDS Differential Clock Input
RXCLKIN+: LVDS Differential Clock Input
DIMO: Backlight CABC Control Signal Output
AVDD: Analog Power
LED+: Backlight Power +
LED-: Backlight Power –
VGL: Voltage -7V
VGH: Voltage 15V
3. Working Principle of LCD Circuit
The image or video input from the camera, or the downloaded video signal is first given to the CPU. The CPU decodes and processes the image according to the format, retrieves the image data from memory through the internal DMA circuit of the CPU, and sends it to the LCD controller inside the CPU. The LCD controller sends the signal to the screen for display, and also generates some other control signals.
The various control signals and image data signals generated by the LCD controller are completed by the hardware and software (drivers) of the LCD controller. The LCD controller is integrated inside the CPU, and the software runs on the built-in LCD controller. The hardware part of the LCD controller mainly establishes pin connections between the CPU DMA circuit and peripheral interface circuits, while the software driver mainly transmits the timing control signals needed by the LCD along these circuits and pin lines, converting and decoding the image data into the data format for LCD display, which is sent to the LCD module through data connections, enabling the LCD to display images normally.
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