LED standard: from display application to semiconductor lighting

In an outdoor LED (semiconductor light-emitting diode) display acceptance, according to the provisions of the acceptance of the completion of most of the content, into the final key program - display effect evaluation. Owners of the unit leaders and experts have focused on the eyes of the screen to play the TV content, a moment, into the discussion:

"The screen brightness does not seem to be enough, the color is not very bright. Some experts say. "The font is not clear. It looks a little fuzzy. "There are experts to speak. "I think the screen surface is not smooth, some places seem to lack color? "Someone asks questions. The contract provides that the screen playback effect can reach the TV effect, the actual effect of the big screen is far worse than the tv! Owners excited voice let the atmosphere becomes particularly tense.

Technical personnel project together, and discuss a technical operation, according to the construction side of the proposed requirements, inspection personnel stand to a certain distance in front of the screen, the screen began to re open a new round of playing program. The first is the broadcast video animation, large screen display screen colors, fonts are also very clear; and then broadcast the video, white clouds, green grass, colorful flowers emit brilliance. Project acceptance smoothly!

China optical photonics industry association LED vice president and general manager of Beijing branch of the four intelligent transportation system integration Co. the company Jizhen in an "China electronic newspaper" reporter tells the story above. Guan Jizhen stressed that the above situation, in the LED display approval application project is not uncommon. In recent years, with the expansion of the field of application of LED display products, acceptance of the product, engineering dissent and even the court also heard. One of the crux of the problem lies in the understanding of product performance and quality differences.

Start from display application

In the information obtained by human beings, the proportion of the information obtained by the human eye is the largest. However, due to the complexity of the formation of human visual perception, the standardization of the display products that provide the human visual perception information becomes very complex.

According to the China optical photonics Optoelectronics Industry Association branch secretary Peng Wanhua introduction, the main technology and industrial development in recent years, LED very rapidly, its application is also expanding, from the earliest application of semiconductor lighting LED display the most widely to the increasingly hot, the product variety, the urgent need to have the relevant technical standards and product standards. Especially in the field of semiconductor lighting, the relevant organizations at home and abroad were active in the organization and the development of semiconductor lighting technology standards, has encountered many problems, but with the growth of market demand, accelerate the development of semiconductor lighting technology standard has been imminent.

Mass production application to promote and influence the development of product standards. LED display is a more obvious example.

1995 years ago, as a representative of the LED display applications LED display rapid development, but then the production of LED display industry norms and standards can be. In 1996 the former Ministry of Electronics commissioned by the Beijing blue company formulated "LED display general specification", January 1998 "," general specification of LED display as the electronics industry standard formally promulgated and implemented, the LED display industry standardization work began to regulate. At the beginning of 1998, China Guangxie optoelectronic devices branch LED display the formal establishment of the Specialized Committee, the industry association was founded, actively carry out the work in the guide and regulate the industry development, optoelectronic devices and LED display technology products and testing standards of communication and coordination etc.. In 1999 held a seminar for LED devices and applications in Kunming, Nanjing and commissioned by the company drafted the "slope detection method" in the LED display, to discuss the organization changes, formally issued in August 2000, in the LED display unit for members of Specialized Committee. In 2003, the revised "LED display general specification" and "LED display test method" as the Ministry of information industry standard officially released. At the same time, sports, transportation, railways and other industries have also issued a series of professional standards for industry applications.

Active light emitting LED display products are widely used in many fields, and it is one of the effective means to release and provide information in modern society. Guan Jizhen stressed that for LED display application standard, in fact the industry has been more and more attention, with the development of the industry, from scratch, in the continuous development and perfection. LED display and application environment and needs highly related materials, devices, etc., from the perspective of the horizon lattice directly determines the quality of display effect, the broadcast program content have a direct impact on the display. In the absence of a clear definition of technology and standard conditions, it is difficult to objectively evaluate the display effect.

LED reliability standards corresponding to speak is also very critical. China Semiconductor Industry Association vice president of discrete devices branch length, deputy general manager of Beijing Changjiang Zhiyuan Electronic Co., Chenglong Ding in an "Chinese electronic newspaper" reporter the interview said: "I'm on various occasions and called for the establishment of China's proposal, the reliability of LED standard system as soon as possible. In 2001, the application status of our scientific research department of Beijing Traffic Management Bureau in the investigation of LED traffic lights, traffic lights placed reception of our scientific research personnel at the roof of the said to us, this is an enterprise South sent traffic light samples last year. Less than a year, you can see the color? Looked at the indistinct red green blue