LCD Display Common Fault

- Feb 11, 2018 -

Frequently Asked Questions 1: There are water ripples and Huaping problems.

The first thing to do is to double-check the computer for the existence of sources of electromagnetic interference, and then replace a video card, or the monitor connected to another computer to confirm the video card itself is no problem, and then adjust the refresh rate. If you exclude the above reasons, it is likely the quality of the liquid crystal display, such as the existence of thermal stability is not good. Water ripples appear more common LCD quality problems, can not solve their own, it is recommended to replace or repair as soon as possible. Some LCD displays will appear Huaping problems at startup, giving the impression that as high-frequency electromagnetic interference, the writing on the screen is very vague and jagged. This phenomenon is generally due to the graphics card does not have a digital interface, and through the internal digital / analog conversion circuit connected to the video card VGA interface. Although this form of connection solves the problem of signal matching, it poses the problem of being susceptible to interference and distortion. The reason is mainly because the clock frequency of the liquid crystal display itself is difficult to keep one hundred percent synchronization with the clock frequency of the input analog signal, especially when the frequency of the analog synchronization signal is constantly changing. If the LCD synchronization circuit at this time is either With the video card synchronization signal transmission line short circuit, poor contact and other issues, and can not be adjusted to follow up in time to maintain the necessary synchronization relationship, there will be problems Huaping.

Common problem two: display resolution set improperly.

As the LCD display principle and the CRT monitor completely different, it is a direct one-to-one corresponding display. Working under the best resolution of the liquid crystal display graphics output analog signal processing, conversion to a specific address with the information (the pixel absolute address on the screen) display signal, and then sent to the LCD panel, the display signal Added to the corresponding pixel on the drive tube, some with memory addressing and writing similar. Therefore, the LCD screen resolution can not be arbitrarily set, while the traditional CRT monitor for the resolution supported by a more flexible. The LCD only supports so-called "true resolution," and the best image can only be seen at true resolution. When set to a resolution other than the true resolution, the display will generally remain the same by expanding or shrinking the screen display, leaving blank areas for the excess. Such as liquid crystal display work in the low resolution of 800 * 600, if the display is still using the pixel-by-one display, then it can only use the screen to narrow the center of the screen using the 800 * 600 pixels to display, though The picture is still clear, but the display area is too small, not only uncomfortable in the sense but also a huge waste of expensive LCD panels. In addition, you can also use interpolation and other methods, no matter what the resolution remains full screen display, but then the display will be greatly reduced. In addition, LCD screen refresh rate settings and the picture quality also has a certain relationship. Friends can set the appropriate refresh rate according to their actual situation, under normal circumstances or set to 60Hz best. 

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