At the 10th Guangzhou International Lighting Exhibition, the LED display is undoubtedly the most powerful lineup, and the small-pitch LED has become the highlight of the exhibitor's concentrated display. Due to the small pitch, the display resolution is further improved, the display effect is comparable to projectors and liquid crystal displays, and entering indoor lighting has become a natural move for manufacturers to open up new markets.
So how do small-pitch LEDs enter the indoor market, and what problems are faced in the process of entering the market? How to solve them?
Zhang Qiang, general manager of an industry website that continues to pay attention to the progress of LED display technology, should be invited to explain in detail the “LED display project bidding and standard construction exchange meeting†held during the exhibition.
Zhang Qiang introduced that there are currently four types of applications in the indoor display, including conference display, video surveillance, command and control, and information display. Statistics show that in 2013, these four types of display markets reached 21 billion yuan, which is a very large market space. But to cut into the indoor application market, small-pitch LEDs must meet the technical requirements of six aspects.
How to achieve "low light and high gray"
Unlike outdoor display, which requires high brightness, refresh rate and energy saving requirements, indoor display needs to reduce the brightness. Experimental tests show that the brightness of LED (active light source) is passive light source from the perspective of human eye sensitivity (projector And the liquid crystal display) twice, as far as the specific data is concerned, the optimal brightness of the small-pitch LED entering the room is 100-300 cd/m2. However, reducing the gradation loss caused by the brightness needs to be completed by technical supplementation. At this exhibition, the large screen showed that the performance network released test samples of small-pitch LEDs, and gave test methods and standards. The tests show that only a few manufacturers can achieve low-light and high-ash at the same time, most manufacturers need a certain degree. Improvement.
How to match the standard resolution of the source
Different from the outdoor display, the outdoor advertisers will select the content suitable for playing according to the resolution of the display. The indoor display signal source has certain standards. As a manufacturer, the source of the indoor access signal cannot be adapted to the resolution of the display screen, but Adapt to the needs of indoor signal sources, design and guarantee the corresponding resolution to meet user needs. It is gratifying to note that after more than a year of understanding of indoor display products and understanding of customer needs, some manufacturers have completed this transformation and met user needs.
How to support system access and display control of multi-signal and complex signals
Compared with outdoor display signals, indoor display features multi-signal access and complex signal access, such as multi-site video conferencing, requiring remote access signals, local access signals, and multi-user access. Experiments show that simple Split screen schemes to achieve multiple signal access will reduce signal standards. Therefore, how to solve the problem of multi-signal and complex signal access requires technical support of small-pitch LEDs.
How to solve the problem of display effect unique to small spacing
Compared with the conventional screen, the pitch becomes smaller, and the afterglow, the first sweep darkness, the low gray reddish, and the low gray unevenness problem occur, and the small pitch LED is required to be considered and solved.
How to achieve seamless seam and high speed correction
The biggest advantage of small pitch LEDs is that they are seamless, but they are more demanding when splicing. For the liquid crystal, as long as the seam is uniform, there is no problem, and the seam is not obvious. However, the small spacing of the LEDs is not good. If the modules are too tightly packed, a bright line will appear. When the module leaves, a dark line will appear. It is not easy to really splicing. Therefore, the process and calibration technology of the cabinet as well as the guarantee and good combination of efficiency are guaranteed.
How to reduce the dead light rate and ensure the stability of the screen
The traditional industry standard is that the LED dead light rate is one in ten thousand, but the small spacing is not good. According to the traditional standard, if there is one dead light in 10,000 square meters, the display can't be seen. The future dead light rate needs to be controlled to one in 100,000 or even one in a million to meet the needs of long-term use. Otherwise, it takes a while for the full screen to be a dead light, which is unacceptable to users.
In addition to the technical guarantees to meet the six major problems, Zhang Qiang also pointed out that the outdoor display is selling products, and asking how much to sell for 1 square meter. But the indoor display sells the overall solution. When outdoor display manufacturers enter the indoor market, they first need to change their mindset. From asking customers what specifications and size of products they want to buy, go to ask customers, what to display, how many signals to display on the screen, and what are the signal specifications? ? Then design according to the resolution requirements, how many points are used, what system is used, and how to connect the user signal to the system to meet the user's needs. Therefore, the indoor display does the overall solution and optimization, rather than the competition of the simple screen price. Since different integrators will adopt different solutions, differentiation will naturally occur, which can explain why the indoor display market does not have the same vicious competition as outdoor display.
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