The principle of liquid crystal display is that liquid crystal under the action of different voltage will show different optical properties. Liquid crystal display is composed of many liquid crystals arranged in an array, in a monochrome LCD screen, a liquid crystal is a pixel (the smallest unit that can be displayed on a computer screen), and in a color LCD screen, each pixel is composed of red, green and blue liquid crystals.
At the same time, it can be considered that there is an 8-bit register behind each liquid crystal, and the value of the register determines the brightness of each of the three liquid crystal cells. However, the value of the register does not directly drive the brightness of the three liquid crystal cells, but is accessed through a “palette”.
It is not practical to equip each pixel with a physical register. In fact, only one line of registers is provided. These registers are connected to each line of pixel in turn and loaded into the contents of the line.
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