LED backlight direct type and edge light type LCD difference
LED backlights are divided into direct-lit and side-lit, each with advantages and disadvantages, as well as cost differences, but in terms of the price of the end products are high and low; research institute LEDinside believes that because ultra-thin TV is increasingly popular, side-light LED TV sales will grow faster and the price will be more approachable. Direct-lit LED TVs are popular with consumers who need high-end audio and video equipment.
Direct-lit, Direct Illumination-type LED Backlight was widely adopted by TV manufacturers at the beginning of the publication; LEDinside said that the direct type is to evenly arrange the LED die behind the LCD panel. As a light source, the backlight can be evenly transmitted to the entire screen, and the details of the picture are more delicate and realistic.
However, compared with the side-lit LED backlight, more LED dies are used. The advantage of the direct-type type is that different backlight module responsibilities can be set separately. In theory, each LED can be independently controlled to control the brightness. However, the line and design cost are not easy. In fact, multiple areas are set in the backlight of the screen, so that these areas can independently adjust the brightness.
LEDinside said that a large-size LCD TV with a direct-lit LED backlight requires thousands of LED dies, which is relatively expensive. Especially when the early LED TV was just launched, the RGB tri-color LED was used to improve the color rendering, the color of the picture could be more vivid, and the cost was naturally high. However, with the use of cheaper white LEDs as backlights in recent years, it is now possible. Adjust to the better level.
As for the edge-lit LED backlight, the LED die is arranged on the periphery of the liquid crystal screen, and then the light guide plate is used to make the LED backlight module emit light, and the light emitted from the edge of the screen is transmitted through the light guide plate to the center of the screen. Go, so that there is enough backlight in the whole, so that the LCD screen can display.
LEDinside said that there are two advantages of edge-lit LED backlights. One is that fewer LEDs can be used to save costs. The second is to create a slimmer body, so that the rear of the LED TV panel is not Need to configure the LED module, but placed on the side, can reduce the overall thickness of the screen, to create a thinner model than the direct-lit LED-backlit LCD TV.
In terms of shortcomings, LEDinside said that in addition to the higher cost of the direct-lit LED TV, when the bright area on the screen is adjusted to a dark area during the picture conversion process, the gray level of the adjacent picture area is affected and reduced, resulting in a slight The phenomenon of blurring. If the direct-type LED backlight module is disposed at the rear of the LCD screen, the higher the LED grain density, or the more the area of ​​the area dimming, the probability of blurring will be compared.
Direct-lit LED TVs consume more power than side-lit LED TVs because of the higher number of LED dies, but still save power compared to CCFL-backlit LCD TVs. The advantage of the edge-lit LED backlight technology is that it can build a relatively thin LED TV model, and the cost is relatively cheap; but the shortcoming of the current edge-lit LED backlight is that the picture uniformity is not good.
LEDinside pointed out that although the thickness of the edge-lit LED TV is relatively small, the number of LED dies used is relatively small, and the light is sent to the screen through the light guide plate, which causes the brightness of the peripheral edge of the LED TV. It is brighter than the center of the screen, and the edge area of ​​the screen is higher than the temperature in the middle of the screen.
At present, the efforts of manufacturers in various countries are naturally trying to improve the blurring phenomenon, thickness and cost of direct-lit LED TVs. This must be done by optimizing the number of LED die configurations, improving luminous efficiency, and lowering LED prices. In terms of LED TV, it is necessary to improve the uniformity of the picture.
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