The side-light type puts the LED on the upper and lower sides of the backlight, and the layout adjustment greatly reduces the use of the LED, thereby reducing the production cost and the energy consumption, and has great benefits for manufacturers and consumers. However, its weakness of local dimming has led to the birth of a locally dimmable matrix backlighting scheme, a backlighting technique that combines side-in and direct-down. 
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Recalling the history of TV development, the traditional CRT TV in the home must be the product that everyone thought of for the first time. In 2000, plasma TVs began to appear; around 2003, CCFL (Cold Fluorescent Tube Light Source) LCD TVs began to appear and became popular; until 2010, LED backlight technology gradually replaced CCFL. Most people inside and outside the world should be able to completely replace CCFL as the backlight of the main TV in two to three years.
Most people know that LED backlights have several advantages, including thinner TV thickness, lower power consumption, and richer colors. These advantages are reflected in the public's ability to simply compare with CCFL TV. In addition, the price of LED TV has been declining, making LED TV more advantageous in terms of cost performance. These are the main reasons why LED-backlit TV can be popularized in the market.
During the development of LED backlights, technology has been improving. The development of the original dot matrix to today's sidelight is one of the important technological advancements. Under various obvious advantages, manufacturers have actively developed LED-backlit TVs in recent years. Domestic brands such as Hisense, TCL, Konka, and Skyworth are all working hard to develop their own LED backlights. Among them, technology improvement and cost control are important links. In order to make modern LED backlights popular in the market, everyone has begun to consider the use of LEDs to reduce product costs. But the most important thing is to improve the energy consumption significantly to match the country's latest environmental protection and energy conservation policies. Use less LEDs and adjust them in the backlight array. The original dot matrix type placed the LEDs on the TV backlight on average, while the sidelight type placed the LEDs on the upper and lower sides of the backlight. This layout adjustment greatly reduces the use of LEDs, thereby reducing production costs and energy consumption.
But most people think that LEDs are less used, and the brightness of the screen will not drop? Isn't TV picture quality also falling? This problem is expected by manufacturers early on, so most manufacturers will find the best way to solve it.
Figure title: dot matrix and edge-lit LED layout
The most common solution in the market today is to use high-performance brightening film to improve brightness. The use of brightness enhancement film is different from other solutions. It is simple and straightforward compared to the improvement of glass penetration rate. It does not depend on the development progress of upstream glass suppliers. It is also different from the use of high-performance LEDs, resulting in higher production costs. Problem (generally high-performance LEDs are two to three times more expensive than regular LEDs). The brightness enhancement film is simply an ultra-thin plastic optical sheet. Using it in the edge-lit LED backlight not only does not affect the overall thickness of the TV, but also compensates for the brightness of the TV screen under cost control. Now DBEF produced by 3M Company of the United States can generally increase the brightness of about 30%. If the TV backlight itself has a brightness of only 300 nits, DBEF can be used without any changes, and the illuminance can be increased to about 390 nits.
Use high-performance brightening film to increase picture brightness
Sidelight backlight development
With the continuous development of technology, the side-mounted LED backlight will develop from a single LED on the upper and lower sides to the final single-sided single LED. The 32" single-sided LED-backlit TVs that are generally visible in the market are about 120 to 150 LEDs. If the TV backlight is changed to a single-sided single LED, the number of LEDs can be reduced to 80-100 (finally reduced) The number of LEDs depends on the brand technology. If the technology is matched, in the foreseeable future, a single LED will be turned from the long side (up or down) to the short side (left or right). Number.
LED backlight simple layout
Extended life
Reducing the use of LEDs not only has a positive effect on cost control, we also see other positive effects on the module. For example, the module temperature will be reduced by the use of fewer LEDs. Take the 32" LCD TV as an example, the number of LEDs can be reduced by about 10%-15%. Although we can't scientifically calculate the number of electronic parts, even the life of the TV can be extended, but From a general technical point of view, temperature reduction must be positive for the life of electronic components. This help is even more pronounced in larger areas of LED-backlit TVs, as fewer LEDs are used less.
Wider angle of view
In addition, the use of high-performance brightening film solutions also contributes positively to the TV viewing angle. The technical principle of the high-performance brightness enhancement film is to allow the polarized light to circulate and reflect in the backlight module until it penetrates the glass. A backlight module using a brightness enhancement film has a brightness enhancement of about 30% higher than that of a module that does not generally use an optical film. Since the high-performance brightness enhancement film is different from the general prism film, it does not need to sacrifice the viewing angle to enhance the brightness, so such a high-performance brightness enhancement film is very popular among domestic and foreign TV manufacturers. LCD TVs are getting bigger and bigger, and consumers are beginning to have certain requirements for viewing angles. A 10,000-inch LCD TV is placed in the middle of the living room. Of course, the head of the household wants to enjoy the TV picture of the same quality.
High-performance brightening film simple schematic
Energy saving
Of course, Volkswagen is most directly able to experience the benefits of side-lit LED backlights, which is the overall energy consumption of the TV. Ordinary 32" LED-backlit TVs, the current level of general energy consumption is about 80W. This level is equivalent to Level 3 in the country's latest energy efficiency standards.
If manufacturers want to improve TV energy consumption standards, there are many solutions, but using high-performance brightening film should be the easiest and most effective way to improve energy consumption. If combined with a high-performance brightening film, the energy consumption can be reduced by about 20%-30% while maintaining the same brightness (final performance depends on the brand technology). From the digital calculation, the TV energy consumption can basically be improved from 80W to 60W through the high-performance brightness enhancement film. The improvement of energy consumption not only allows manufacturers to cooperate with the national environmental protection policy, but also helps consumers to pay related electricity expenses.
From the above technical analysis, we have seen that the side-lit backlight design has great benefits for manufacturers and consumers. In the near future, side-lit single-sided single LEDs must be the ultimate destination for LED backlighting.
Side-light advantage comprehensive analysis
There is also a side-lit type called side-in type, and the biggest weakness is that local dimming cannot be achieved. Since the LED lights are concentrated on the edge of the TV, the light must be evenly outputted to the TV screen by the light guide. Therefore, it is difficult to adjust the brightness of a certain area of ​​the screen. In the direct type, since a certain partial LED switch can be realized by the LED driving chip, the advantage of local dimming is obvious. Therefore, a new local dimming matrix backlighting scheme combining the advantages of both direct and side-input technologies has emerged as the times require, and has become the focus of relevant backlight manufacturers.
Regarding the matrix backlighting scheme that can be locally dimmed, it should be said that it is a backlight technology combining side-in and down-down. Lu Yihang, a senior engineer from the Optical Systems Department of 3M Company, said that the technology has already done some basic research in the backlight factory as early as 2009. At present, many backlights are classified into direct-lit backlight technology, which is referred to as matrix backlight.
The advantages of this technology should be said to focus on the advantages of both direct and side-entry technologies:
1. Local dimming: At the beginning of the early LED TV, there were two kinds of technical direct and side-in type. One of the biggest weaknesses of the side-entry type is that it cannot be locally dimmed. Since the LED lights are concentrated at the edge of the TV, the light must be evenly outputted to the TV screen by the light guide. Therefore, it is difficult to adjust the brightness of a certain area of ​​the screen. In the direct type, since a certain partial LED switch can be realized by the LED driving chip, the advantage of local dimming is obvious. As a combination of the two technologies, the matrix backlight can also achieve the function of local dimming, and the controllable partition is completely determined by the LED driver. In some of the earlier matrix products, there are more controllable partitions than the current direct type.
2. Thickness: Regarding the thickness, it is a fatal weakness of the direct type backlight. Even if Sharp uses the LED+lenslet method, the thickness of the LED lamp shadow is greatly reduced, and the thickness of the TV is still much higher than that of the side-in type. The thickness of the light plate, which is also the main reason for the complete failure of the direct type under the two kinds of LED backlight technology. It can be said that the matrix backlight perfectly solves this contradiction.
3. Picture contrast: As an important point of image quality, contrast is relatively a weakness of LCD. Since the twist of the liquid crystal cannot always achieve the 0,1 control of the full switch, the contrast of the side-in liquid crystal is usually only about several thousand even if the dimming technique is applied. While direct dimming technology turns off the LEDs when displaying black images, the contrast can be greatly improved. According to LG claims, their contrast ratio can reach 7 million:1.
4. Energy saving: In the darker part of the image, the power consumption is reduced by turning off or reducing the LED current, which is also an advantage of the direct backlight. Similarly, the matrix backlight has the same advantages.
5. Heat Dissipation: As a technical point of the side-lit backlight, since the matrix backlight disperses the LEDs in the backlight in a large amount instead of being concentrated on one side of the TV set, the heat dissipation design is relatively simple.
Although the matrix backlight has some of the above advantages, it should be said that it is a new direction of LED design in the future, but its shortcomings are also obvious at present:
1. Since matrix backlighting requires precise control of the block backlight, in general, the design of the circuit will be much more complicated; in addition, the selection of LED chips and some control chips will also increase the cost.
2, in the assembly, matrix backlight correspondingly, the process complexity is much higher than the current direct type and side-entry type. Therefore, the yield and cost of assembly are also a major factor limiting it.
Compared with the traditional direct-type backlight, the matrix backlight has a higher local precision than the direct-type backlight. Since the direct-descent type has been diffused in the lower diffuser, the matrix type is in the lower diffuser. The film is evenly lit, so that the influence between adjacent partitions needs to be smaller than the direct type, and the contrast control will be finer. However, due to the small mutual influence of the partitions, in the event of damage to the LEDs of a certain block, the optical defects will be much more obvious than the direct type. In addition, its thickness advantage is extremely obvious. However, since each partition of the matrix is ​​relatively independent and has a side-in backlight, the complexity of the mechanism is much higher. At present, many direct-type partial-area control lights are controlled by the light of some LEDs in a region, and the matrix type must control each block, so the circuit is relatively complicated.
Compared with the side entry, the matrix method solves the problems of local light control and intelligent energy saving, greatly improves the screen contrast, and has a relatively simple heat dissipation design; and its optical distance due to the light guide backlight is much lower than the side input type, and its optical The efficiency will be higher than the side entry type, and the thickness can also be compared with the side-in backlight. The only area that is insufficient compared to the side-in backlight is the cost and manufacturing complexity mentioned above. A typical light guide plate needs to be realized by hundreds of partitions, which means that the number of parts and the assembly complexity are also increased by several hundred times. Since the backlight components are display-related, the defective rate during assembly is poor. Believe it is also a big problem.
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Our products are extensively used in household industry/electronic industry/automobile industry/building industry and other industries.
We have rich experience on one-stop solution, provide various services from new product design,prototype,mold making,mass production,assembly and logistics. The most important advantage is we have our own R&D team to help clients to turn ideas into actual parts. All of these engineers and designers have over 15 years experience in these plastic products fields.
We have a strict quality control system, an excellent management team and also a dedicated sales force, enable us to fulfill our commitment in high quality products and outstanding services.
If you are looking for a trustworthy supplier of customized items, please do not hesitate to contact us. We are always striving to establish a win-win partnership with customers from all over the world and help our partners to stay one step in front of your competitors.
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