LED backlights are divided into direct-lit and edge-lit types, each with advantages and disadvantages, and cost differences, but the prices of terminal products are different from each other; as ultra-thin TVs are becoming increasingly popular, the sales of edge-lit LEDTVs will grow. Faster and more approachable in price. The direct-lit LEDTV is popular with consumers who need high-end audio-visual equipment. When the direct-lit LED backlight LCD TV was first published, it was widely adopted by various manufacturers; the direct-lit type is to arrange the LED dies evenly behind the LCD panel as the light source, so that the backlight can be evenly transmitted to the entire screen, and the picture details are more Delicate and truthful.
Brands that use direct-lit LED backlights, such as Sharp XS1 series LCD TVs, require more LED dies than edge-lit LED backlights. The advantage of direct-lit LED backlights is that they can set different backlight module powers and responsibilities. In theory, it is possible to control the brightness of each LED independently, but the circuit and design costs are not easy. In fact, multiple areas are set in the backlight of the screen, so that the brightness of these areas can be adjusted independently..—Taiwan Large-size LCD TVs with direct-lit LED backlights require thousands of LED dies, and the cost is relatively high. Especially when the early LEDTVs were just launched, RGB three-color LEDs were used to improve the color, so that the color of the picture can be more vivid, and the cost is naturally high. However, as individual manufacturers use cheaper white LEDs as backlights in recent years, it is already possible. Adjust to a normal level. The edge-lit LED backlight is to arrange the LED dies on the periphery of the LCD screen, and then match the light guide plate, so that when the LED backlight module emits light, the light emitted from the edge of the screen is transmitted to the central area of the screen through the light guide plate. , In this way, the overall amount of backlight is available, allowing the LCD screen to display images.
There are two advantages of edge-lit LED backlights. One is that it can use fewer LED dies, saving costs, and the other is that it can create a thinner and lighter body, so that the rear of the LEDTV LCD panel does not need to be equipped with an 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 backlight LCD TV.
The LCD TV with edge-lit LED backlight can be very thin. In terms of shortcomings, when the bright area on the screen needs to be adjusted to a dark area during the screen change process, the gray level of the adjacent screen area will be affected and reduced, resulting in a slight blur. If the edge-type LED backlight module is placed behind the LCD screen, the higher the density of the LED crystal grains, or the more areas for dimming, the probability of blurring will be smaller. The advantage of the edge-lit LED backlight technology is that it can build a relatively thin and light LEDTV model, and the cost is relatively cheap; but the current edge-lit LED backlight has the disadvantage of poor picture uniformity.
Although the thickness of the edge-lit LEDTV is thinner, the number of LED dies used is relatively small, and the light is sent to the screen through the light guide plate, which will cause the brightness of the edge of the LEDTV to be higher than that of the center of the screen. Bright, the edge area of the screen will be hotter than the middle of the screen.
