LCD liquid crystal screen classification

Nowadays, the pictures of LCD screenproducts on the market are getting clearer and more refined, but not all screens are so excellent. So how does the mobile phone LCD screen distinguish between good and bad screens? This involves a concept, the classification of LCD screens. Different display application scenarios, choose different LCD screen grades, so as to match the most suitable screen for your product. Generally, the grades of LCD mobile LCD screen screens can be roughly divided into A grade, B grade, and C grade. LCD panel manufacturers also divide A-level panels into two levels, A+ and A, which are mainly aimed at products with higher display quality requirements. So what is the basis for distinguishing LCD screen levels? Usually the LCD screen industry judges the level of LCD screens based on the number of dead pixels on the LCD screen. First of all, let's introduce a concept: LCD screen dead pixels. We all know that the LCD screen can be subdivided into each sub-pixel, and the sub-pixels can display black and white and the three primary colors of red, green and blue. The dead pixel of the LCD screen means that no matter what the image displayed on the LCD screen is, a certain sub-pixel on the screen will always display the same color. Dead pixels can be roughly divided into two categories, one is that the sub-pixels are always black no matter how the screen is, called dark spots, and the other is that as long as the screen is turned on, there will always be bright spots, called bright spots. Generally speaking, dead pixels on the screen cannot be repaired, and can only be repaired by replacing the entire screen. Knowing the concept of LCD screen dead pixels, let's roughly introduce the division of LCD screen grades: A+ grade LCD screen: mobile phone LCD screens without any dead pixels are called A+ grade LCD screens. Through the professional test software test, there is no bright spot in the power-on state, and there is no dark spot behind the display screen, and the display screen is stable and smooth. The A+ grade LCD screen is the highest quality LCD screen, suitable for display fields that require extremely high display quality, such as LCD monitors, vehicle displays, medical displays, etc. A-level LCD screen: The total number of dead pixels does not exceed 3, and there is only one bright spot at most, and the bright spot is not in the central area of ​​the screen. We call it an A-level LCD screen. The screen display is still high-quality and smooth, and generally there will be no obvious dead pixels during use. General application and LCD TV, home appliance display and other fields. B-level LCD screen: The total number of dead pixels does not exceed 5, and there are only 2 bright spots at most, and the bright spots are not in the central area of ​​the screen, which is called B-level mobile phone LCD screen. The brightness of the screen is relatively uneven, and the color saturation is relatively insufficient. Most cheap LCD monitors use this kind of B-level panel, and the cost is relatively cheap. C-level LCD screen: In addition to the dead pixels of the LCD screen, the screen with line defects is called a C-level LCD screen. A line defect refers to a bright or dark line on the screen. It is a display defect caused by a short circuit or an open circuit in the screen. The image color reproduction ability of c-level LCD screen is poor, and the appearance may even be damaged. It is basically not used in large-screen products, and most of them are cut into small-area LCD panels to be used in small-sized display fields.

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