Vehicle Commercial Advertising P4 SMD Outdoor LED Screen Panel
Vehicle Commercial Advertising P4 SMD Outdoor LED Screen Panel LED display application and development overview The led display screen is a new type of flat panel display device that appeared in the 1990s. Due to its high brightness, clear picture, and vivid colors, it makes it stand out in the...
Vehicle Commercial Advertising P4 SMD Outdoor LED Screen Panel
LED display application and development overview
The led display screen is a new type of flat panel display device that appeared in the 1990s. Due to its high brightness, clear picture, and vivid colors, it makes it stand out in the public multimedia display field, so the market space is huge.
Led display market rises with technological development
The development of led display can be divided into the following stages: The first stage is from 1990 to 1995, mainly monochrome and 16-color graphic screen. It is used to display texts and simple pictures. It is mainly used in public places such as stations, financial securities, banks, and post offices as public information display tools.
The second stage was from 1995 to 1999, and there were 64-level and 256-level grayscale dual-color video screens. Applications such as video control technology, image processing technology, and optical fiber communication technology have brought the LED display to a new level. Led display control specific LSI chips are also developed and used by domestic companies at this time.
The third stage began in 1999. A large number of red, green, and blue LED tubes flooded into China. At the same time, domestic companies conducted in-depth research and development. Full color displays using red, green, and blue primary LEDs were widely used. Massive access to sports venues, convention centers, plazas and other public places will bring the domestic large screen into the full-color era.
With the rapid development of the LED raw material market, surface mount devices have been available since 2001. They are mainly used in indoor full-color screens. With their high brightness, vivid colors, and low temperature characteristics, the dot pitches that can be adjusted freely have been demanded by different price points. It was accepted that in just over two years, the sales volume of the product has exceeded 300 million yuan, and the surface mount full-color LED display application market has entered the new century. In order to adapt to the “slimming” plan for the 2008 Olympic Games, Ryadh developed a surface-mount dual-color display, which is used extensively for training halls and competition timing scoring systems. In the full color screen of Olympic venues, most of the full-color screens are detachable for tight investment. They can be used as live broadcasting tools during the Olympic Games. After the end of the competition, they can be used for leasing. As public utilities such as performances and national policy announcements, such applications can be used. The method can recover the cost as soon as possible.
In terms of the market, China's accession to the WTO and Beijing's successful bid for the Olympic Games have become new opportunities for the LED display industry. The domestic led display market continues to grow. Currently, in the domestic market, the domestic led display market share is nearly 95%. The international led display market capacity is expected to grow at a rate of 30% per year.
At present, the major manufacturers of led display screens are concentrated in Japan, North America and other places, and the export share of China's LED manufacturers is insignificant. According to incomplete statistics, there are currently at least 150 manufacturers in the world producing full-color screens, of which about 30 are full-scale companies.
Domestic LED display technology gap where
With the continuous expansion of the led display market, the current domestic full-color market is gradually divided into three grades. The first grade is high-end products produced by internationally renowned companies such as Barco and Panasonic; the second grade is products manufactured by Riyal High-quality LED developed by large-scale domestic enterprises; and the third grade is LED-made display panels produced in China. These three grades of led display have a big difference in price and function.
In terms of technology, the development of led display should closely follow the quality characteristics of world-class companies. At present, the difference between domestically produced high-quality led display and foreign top-notch products in image processing technology and front-end video processing technology is not significant. The main gap is the following: Two aspects:
Single color verification
The "single-point color verification" technology ensures a realistic color display that lasts for years.
At present, domestic products can only be adjusted to unit modules and unit boxes, and can not be truly single-point adjustment, so there is a difference in the consistency of color and brightness, especially after the replacement of the display unit after maintenance, due to LED The parameters may have changed, the display effect is difficult to keep consistent with the original screen, and this work is completed by a dedicated large-scale equipment in foreign countries, and there is no domestic equipment developed due to product characteristics, and it also hopes that the relevant industries And equipment manufacturers can give attention.
At present, this work is done in Bakkerade: In the module, LED lamps in each pixel have their own values of color and brightness. These LEDs must be accurately measured when installed at the factory. However, these data are stored to the EEPROM in each module at the same time. When the display signal is processed, the digital processor (DIGITIZER) will read the information from each EEPROM and correct the LED brightness and color difference. , to ensure that the display results in a consistent best state.
At present, the casings of domestic products are basically made of single-piece sheet metal. The processing technology is poor, the accuracy is not high, the appearance is not beautiful, and the waterproofness is not very good. Especially in the harsh outdoor environment, it may easily cause system instability. .
The cabinets should be suitable for the harsh working environment. All the external hardware of the cabinets are packed in the aluminum alloy casting box with IP65 standard. The special sealing measures adopted by the box are sufficient to prevent the entry of rainwater and dust. The number "5" is a grade that prevents the infiltration of liquids and is one of the design requirements, so that the display system can work normally in a rainy and water-free environment.
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