LED backlight LCD TV is the focus of our discussion, it is divided into two types of direct backlight and side-in backlight mode, because the LCD screen itself does not emit light, LCD screen display image must have a backlight source, as the name suggests, direct type and side The main difference is the location of the backlight.
The direct-lit backlight arranges a large number of LED light bulbs evenly behind the liquid crystal panel, and the LED light bulb of the side-entry backlight is located at the peripheral edge of the screen, and the light is uniformly scattered on the liquid crystal panel through the function of the light guide plate.
Compared with the direct-type backlight, the edge-type backlight does not need to configure the LED light bulb under the liquid crystal panel, which can reduce the overall thickness of the screen, thereby creating a thinner television.
The glass light guide plate makes the TV thickness further reduced. The side-entry backlight reduces the thickness of the TV. Many current ultra-thin TVs control the thickness of the body to about 9mm. It seems that there is no possibility of further reduction, but we can see that In the past few years, there have been some 4.9mm LCD TVs, such as Sony's series of floating aerial X9000C, micro whale TV drunk A series, millet TV 4 65 inches (not yet listed), they have in common is the use of Corning Iris glass light guide.
The light guide plate is a very important part of the liquid crystal panel. Its role is mainly to make the light from the backlight source more uniform and avoid uneven brightness distribution. In the past, the light guide plate had been made of acrylic material. The plastic light guide plate was distorted or expanded when it was exposed to heat or moisture, which affected its optical and mechanical properties. Therefore, it was necessary to add a wider frame and a thicker backlight. Source to solve plastic instability.
Glass instead of plastic can avoid this problem. Corning's Iris glass guarantees optical performance through patented technology, making thinner side-into LCD TVs possible. According to Corning's official data, Iris glass is 75% thinner and 32% lighter than regular acrylic. After using this glass, the thickness of the light guide plate will be reduced to less than 5mm. This is the reason why current LCD TVs can be so thin.
Glass light guide plate technology needs to be further mature Glass light guide plates allow LCD TVs to be further reduced in thickness, and it is possible to compete with OLED TVs. However, compared to acrylic materials, glass light guide plates require a higher manufacturing process and the cost naturally increases. The soon-to-be released micro whale drunk thin A series, 55 inches 8999 yuan, 65 inches 16999 yuan price is 2-3 times the ordinary LCD TV.
In addition, although the TV with a glass light guide plate is slim enough, according to the current situation, it cannot bear a larger size, and it is still difficult for a 70-inch or larger super-screen TV to use this technology.
“Thin†is one of the main development directions of current TV. For LCD TVs, 4.9mm pursues OLED. Of course, “thin†is not all. Individuals feel that the visual difference between 9.9mm and 4.9mm is not as large as they thought. If only In order to pursue thinness, loss of image quality is not worth it. â–
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