LCD display brightness test method and calculation method

   The LCD screen itself does not emit light, and a backlight needs to be added to the back of the glass for normal display. This involves how to test the surface brightness and backlight uniformity of the LCD screen. The brightness of the LCD screen surface and backlight brightness are measured through BM -7 equipment test, the test is more accurate when the display is powered normally and displays a solid color picture.

    Whether the average brightness of the backlight is uniform, the calculation method is: minimum brightness ÷ maximum brightness × 100% = uniformity (data). Small and medium-sized LCDs measure the brightness of 9 points, and divide the measured minimum value by the maximum value to get the uniformity of the LCD. The higher the uniformity, the better the consistency of the LCD image quality. A uniformity greater than 85 is considered qualified.

   The uneven brightness of the LCD display will cause a large difference in light and shade on the LCD display, and the overall display effect will be inconsistent. Some places will be dark and some will be bright. In severe cases, light spots and light leakage will occur.

   Shenzhen Hongjia Technology has a set of strict inspection procedures for incoming backlight materials, which can screen out backlights that emit uneven light and prevent bad backlights from being put into production, thereby affecting the overall brightness of the display. The company has also developed high-brightness backlights, which can be used on LCD screen surfaces The brightness can reach 2000 lumens, which is clearly visible under sunlight and the display brightness is uniform, which can satisfy customers with high requirements.