The uneven brightness of the LCD screen is reflected on the LCD, and the brightness of the display is very different. Our eyes consume more energy than usual when dealing with this difference in light and dark, so our eyes can easily get tired when using LCD monitors 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). General inspection increases customer requirements by 5%. Generally speaking, small and medium-sized liquid crystal displays measure the brightness of 9 points, and divide the measured value by this value as the uniformity of the liquid crystal display. The higher the uniformity, the better the consistency of LCD image quality. The ideal uniformity is 100%, the higher the uniformity, the better the consistency of the picture brightness.
In the manufacturing process of liquid crystal panels, it can be roughly divided into three stages: array, cel1 and module.
Although most of the process of LCD panel manufacturing is done in a clean room with a high level of cleanliness, some defects will inevitably appear on the LCD screen. There are many reasons for these defects, which can be found in their manufacture.
Every link has flaws. Pinhole defects and black spot defects formed in the box forming stage are two common point defects.
Pinhole defects are formed if vacuum bubbles are created in the cell when the liquid crystal is poured. If there are some clusters of particles in the empty box before pouring the liquid crystal, or.
When the liquid crystal is filled, some particles are mixed into the cell, causing black spot defects.
The core of the point defect will anchor the liquid crystal molecules around it, so it will inevitably affect the orientation of the liquid crystal molecules within a certain range. through two typical point defects.
It is found that the ability of different defect nuclei to affect the arrangement of surrounding liquid crystal molecules varies greatly, and the experimental phenomenon is demonstrated by the extrapolated length theory and elastic long-range correlation theory.
Defects and attention points of LCD screen
2022 03/21