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Brightness and contrast: Brightness and contrast can be said to be the most basic conditions for judging the quality of liquid crystal displays. Usually the screen has a higher brightness value to make the picture brighter, and the LCD screen needs a brightness value of at least 200cd/m2 to display a picture that meets the basic requirements. Of course, the higher the brightness value, the better the performance. The picture is also more vivid.
Contrast refers to the brightness contrast between black and white colors. In other words, a high-contrast liquid crystal display can display richer color levels. Basically, the contrast index of the liquid crystal display must be at least 200:1, otherwise, uneven color blocks may appear when displaying pictures with the same color gradient, and the display texture is poor. Of course, the higher the value of this indicator, the better.We are the lcd manufacturersfor small size displays such as 1.8inch 128x160, 2.0inch 176x220, 2.0inch 240x320 IPS, 2.8inch 240x320, 3.5inch 320x240 and 3.5inch 320x480 IPS ect.
Signal reaction time: The signal reaction time refers to the time required for each pixel of the liquid crystal display to go from dark to bright and from bright to dark. The general specification indicates the average value of the above two, but some manufacturers will list both values. For consumers who want to use LCD to play games and watch movies, this data is very important. If the signal response time is too long, the dynamic picture is prone to afterimages, and the display effect will be greatly reduced.
Generally speaking, the signal response time of the current liquid crystal displays on the market should be below 30ms, and even models below 15ms can be seen everywhere. If the user has a large number of dynamic picture needs, such as game players, it is best to choose a product with a shorter response time.
In addition to the proper nouns that often appear in the manual, there is an important criterion for the quality of LCD monitors: the number of bright spots. The so-called bright spot is a pixel (pixel) that is continuously lit and does not accept the extinguishing signal, which is also called a dead pixel. Bright spots are usually not easy to spot, and users have to watch them carefully in a completely black screen to find them.
The bright spot can be said to be a unique problem of liquid crystal displays. Its cause is: in the process of manufacturing the LCD panel, the good rate cannot reach 100%, so there will be a bright spot problem when leaving the factory. Generally speaking, the number of bright spots of A-level panels is limited to 3 or less, and some brands also offer no bright spot guarantee. If the bright spot exceeds the quantity standard specified by the manufacturer, it can usually be replaced with a new one.
To check whether the LCD display has bright spots, you can use graphics software (the simplest tool is the drawing that comes with Windows) to draw a black picture, and zoom in to the full screen state (such as 1024X768 resolution), and then carefully check the screen Are there any shiny dots? In addition, after a long period of use, liquid crystal displays sometimes gradually appear bright spots. Therefore, after consumers get the product, they may wish to start the test for a few days. If during the replacement period (usually 7 days), the number of bright spots exceeding the replacement standard is found, the merchant can be required to replace the new product.
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