Viewing area
Refers to the part of the display area that can be used to display images in actual applications. The full size is actually the size of the frame and PCB board. 3.5 inch lcd display，The part that can be used to display the image does not reach this size at all, because the frame occupies a part of the space. For LCD, the nominal size is basically the size of the viewable area, and the space occupied by the frame is relatively small. So when buying an LCD screen, just choose the one that suits you.
responding speed
The time unit to measure response speed is milliseconds (ms), which refers to the time it takes for a pixel to change from light to dark and from dark to light. The smaller the value, the better, the smaller the value, the faster the response speed. At present, the response speed of mainstream LCD is above 1-2ms, which has little effect on general industrial use.
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LCD screen resolution and screen color
What is the working principle of liquid crystal display