The brightness of the LCD is uneven, which is manifested on the LCD. The display has a large difference in brightness and darkness. Our eyes consume more energy than usual when dealing with this difference in brightness and darkness. Therefore, the eyes are prone to fatigue when using LCDs with uneven brightness.

The calculation method of the uniformity of the average brightness distribution of the surface light source is brightness÷brightness×100%=uniformity (data). Generally, internal inspections are increased by 5% on customer requirements. Generally speaking, small and medium-sized LCDs measure the brightness of 9 points, and divide the measured value by the uniformity of the LCD. The higher the uniformity, the better the consistency of the LCD image quality. The ideal uniformity is 100%, the higher the uniformity, the better the consistency of the picture brightness.