What are the common problems of LCD LCD screen?

Do you know the common problems of LCD screens? With the development of science and technology, mobile phone LCD mobile LCD screen screens are loved by many users because they have no battery radiation, display a large amount of information, and have a long service life. However, problems often occur when using the LCD screen for a long time. What are the problems with the general mobile phone LCD screen? First: LCD image misalignment The LCD screen is displaced in the horizontal direction, or has a color, white, or black stripe of several pixels on the top or bottom. Generally speaking, this happens because the initialization parameters are set incorrectly, which is related to the line sync or field sync signal. If the display position is shifted or misplaced, check the width, front and rear delay, and polarity of the iphone LCD module and the LCD controller on the CPU to match the width, front and back delay, and polarity of the horizontal synchronization and vertical synchronization signals. The most likely thing is that the delay time before and after the retrace does not match. Second: Large-scale LCD images are dislocated, superimposed, and repeated. Large-scale images on the mobile phone LCD screen are misaligned, superimposed, or repeated. This situation is generally not caused by the delay of the line synchronization or field synchronization signals, and this aspect can basically be ruled out. Impact. You can check whether the parameters of functions such as downsampling are normal, and it is also caused by differences in timing or clock frequency due to different hardware platforms of LCD screens. When encountering this situation, the first thing to do is to carefully calculate the DMA transfer parameters. In other cases, specific issues should be analyzed in detail. Third: When the LCD is turned on, there is a blurry screen. Generally, it is because the backlight is already on when the LCD refreshes the first image after the initialization is completed and is not fully ready. The solution is to lengthen the delay before the backlight turns on when UBOOT is on. Point 4: LCD does not light up. There are many reasons for the problem of LCD not lighting up, but after this problem occurs, you should first judge whether the LCD is initialized correctly. The easiest way to judge is to measure the voltage across the capacitor on the FPC of the LCM. LCD screen LCD screen LCD screen LCD screen manufacturers

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