For most consumers, LED backlighting is almost the technological vocabulary of the most cutting-edge technology, and it seems to be a combination of technology. But like other new technologies, the development of LED backlights has also undergone a long period of time, and LED backlights can be clearly separated from generation to generation. At present, the most popular side-in LED backlighting method on the market has certain defects in technology. When the latest generation of Full LED is getting closer and closer to us, it is necessary to review the LED backlight along the time footprint. development path.
Fish and bear's paw can't have both
We divide the LED backlight type, the main basis is according to the distribution of LED lights. In the past, we are most familiar with the two methods of side-in and direct-down. The side-in type backlight is placed on the upper and lower edges of the screen, which can be made very thin. Most LED TVs on the market are of this type, but the light sources are mainly concentrated on the upper and lower edges. In the use, you will find that in the center of the screen, it is easy to cause the brightness recessed area or the light leakage area. The contrast of the central position is not high enough, and the contrast of the picture is ambiguous; the direct type backlight is to evenly place the LED directly behind the panel. Compared with the side-in backlight, it can make the light source distribution more uniform, and the local brightness control is more precise, which also effectively improves the picture display quality, but unfortunately, the direct type backlight has high cost and volume. Larger, although there are certain advantages in performance, it is rarely used in the products actually sold.
The best of both worlds
So is there a new way of backlighting that can combine the advantages of side-in and direct-down, while avoiding the shortcomings of these two methods? The Full LED introduced to you today can fully satisfy the user's wishes. The biggest difference between the Full LED and the previous two generations of LEDs is that the number of LED lamps is increased in cost, the controllable area is greatly increased, and the thickness is greatly reduced. Take the example of a 55-inch product. The total number of LEDs in the direct-lit backlight is only 336, and the number of controllable partitions is 16. In the same size of the Full LED backlight system, the number of LEDs is up to 1,200, which can be independently controlled. The partition has reached 240, and the thinnest thickness of the Full LED backlight can be reduced to 23.3mm. These exciting numbers have witnessed the LED backlight mode, which has led to an increase in the quality of the display due to the number and distribution of LEDs.
From left to right, there are three backlights: side-in, direct-down and Full LED.
So what are the specific advantages of the Full LED compared to the previous two generations of LED backlights? In fact, according to the schematic we provided above and our explanation below, it is easy to think clearly, and you can choose to understand when you buy TV.
The light source of the side-in LED is also mainly distributed on the upper and lower edges. It relies on the light guide plate to transmit light energy. Even if the efficiency of the light guide plate is higher, the efficiency and uniformity of the direct light source must be compromised, and The light guide plate is integrated, it can not differentiate and personalize the brightness control of an area, which is easy to cause brightness depression or black screen light leakage, and the contrast in the center of the middle screen will often decrease, resulting in contrast of the light and dark details of the middle picture. vague. Compared to the Full LED backlight, the side-lit backlight is only similar in volume, and it is a Full LED backlight in terms of image quality.
The direct-lit LED backlight distributes the LED evenly behind the liquid crystal panel, so the brightness uniformity is improved, and the contrast can be improved by controlling the LED of a certain area, thereby obtaining higher image quality. At the same time, however, direct-lit LED backlights are generally thicker because of the need to ensure that relatively dense LEDs have good heat dissipation. Although the picture quality is still acceptable, due to its large size, it is almost the same as the thickness of the ordinary CCFL backlight type product. Therefore, manufacturers are not interested in the promotion of direct-lit LED backlight. Full LED responds faster and more accurately to changes in a certain area, which makes the precision of the Full LED in the area control and the final picture quality stronger than that of the direct-lit LED. In addition, it has made a huge breakthrough in volume control, so Full The LED has achieved no suspense in the comparison with the direct-lit LED.
Efficient and energy efficient
If you measure these three kinds of LED backlights from the perspective of using durability and protecting user investment, you will find that although the Full LED doubles the number of LEDs, but because of the higher photoelectric efficiency, the result does not consume much power, but instead The negative light load requirement for each LED unit is also greatly reduced, which is beneficial for effectively reducing the heat generation of the LED, thereby greatly increasing the useful life of the Full LED.
Human pursuit of quality and comfort has remained unchanged. Through the various LED backlight schematics and analog diagrams above, I believe that the advantages and disadvantages of LED backlight types are also clear. Full LED has made great progress in display quality, durability and lightness, representing the future of backlight technology.
Technology has become productive
The good news is that the Full LED we are talking about today is no longer a distant concept technology in the lab. It is now assembled into some of the latest models, including LG in the high-end LEX9, LX9500 and In the LE8600 series, innovative Full LED technology is used. Today, domestic users are already able to purchase commercially available models using this state-of-the-art backlight technology.
Recently, with the launch of the Full LED model, users will feel the quality improvement and thin fashion brought by Full LED. Full LED is likely to become a benchmark technology for high-end flat-panel TVs, just like the early Full HD guide. In the era of a full HD, the benchmark performance of flat-panel TVs continues to increase. After the new technology benchmark is established, users can enjoy new technologies earlier in fully competitive market conditions. Let us look forward to the wave of Full LED to clean up the high-end flat-panel market as soon as possible. We also hope that Full LED will enhance the quality of the picture and the slimming fashion, which are two different trends that can be compatible and combined to avoid the regrets caused by users.
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