led electronic screen is set microelectronic technology, photonics technology, computer technology, information processing technology in the large-scale integrated display system. With its colorful, wide dynamic range, high-brightness, long life, work performance and stability is becoming the best show in the media, widely used in advertising, securities, information dissemination, press releases, etc., is the worlds most advanced Showing the media.
led electronic screen (led panel) is controlled by a certain way, used to display text, graphics, images, animation, Quotes, video, video signals, and other information led array device composed of the display screen.
History shows that the evolution of methods
The plot traditional white lights, unable to overcome their power consumption, short life of the defects, neon lights, advertising light boxes, although the plane signboards advertising and color Xianli, but changes in monotone, can not play video ads; magnetic pirated although assembled by computer Simple patterns, but do not have the light source itself, the effect of the use of night differential. In recent years, with the micro-electronics technology, automation technology, computer technology is developing rapidly, the production process to update and the application of new materials, making the brightness LED chips, life has been rapid development, making it increasingly broad applications, LED display market have developed by leaps and bounds. 93, the ultra-highlighted blue, red and green LED for the emergence of true color screen makes achieving a reality, outdoor display of love by people, particularly in the stadiums, advertising, news and other fields increasingly extensive application . From the future development trends, currently has a video effect of several media, great deal of diversity among its performance advantages:
Cathode (crt) or quartz tube (dv) large-scale television: the cost is very expensive and usually only do 37-inch size will be limited to large, and do not need large screen and in the indoor use, the results are satisfactory.
Color liquid crystal display (led): equally costly, complex circuits, the area can not be too great, but the perspective of the impact of very large, very small viewing angle, but the delicate screen, visual sense of good.
Image projection equipment (projector): brightness of small, poor resolution (screen-by uneven), the advantage is easy installation, maintenance simple.
TV wall (tv-wall): Segmentation of the surface, the visual sense of a foreign body, the brightness of outdoor applications on the effects of poor, not suitable for that text, but the indoor performance of the television screen well.
led by smaller space constraints, and can be designed in accordance with the users screen size, with full-color effect, the perspective of the characteristics that can text, graphics, images (including animation and video).
Chinas rapid economic development, dissemination of information are growing demands. It is believed that, led electronic display with its bright colors, shows that the amount of information, long life and power consumption of small, light weight, space, small size, high stability, easy to operate, easy installation and maintenance, and other features will play in social and economic development越来More important role. Have to appear, led in todays display screen in the media and cost, is your best choice.
LED display applications
Rosoff lossew.ow discovered in 1923 in the semiconductor sic accidental formation of the light-emitting pn junction, but the use of semiconductor pn junction electroluminescence principle made of light-emitting diode in 1960 only to the late stage of rapid development .
In recent years, semiconductor production and processing technology to gradually mature and perfect, light-emitting diode (led: light emitting diode) display has been growing in solid dominated.
led by the extensive attention has been developing rapidly, and it is by itself has the advantage inseparable. These advantages can be summarized as: high brightness, low voltage and power consumption of small, integrated circuits and micro-of-match, driving a simple, long life, impact-resistant, stable performance. led the broad prospects for development, which is now in the higher brightness, higher climate of tolerance, higher luminous uniformity, higher reliability, panchromatic the direction of development.
Because of different semiconductor materials can be sent to different colors of LED chips led.
Video display system and the ultra-large-scale integrated chip programmable
Video shows that the traditional method is the use of discrete small-scale integrated circuit technology. When large-scale increase in system performance (such as 16 to 256 gray gray), such technology would have a serious impact on system reliability and maintainability. Gray-raising later, with the increase of computing data, to adopt a more complex and more numerous small-scale dispersion device, which will enable the system to ensure reliability and maintainability. In addition, the naked eye brightness levels and poor equipment distinguish between different feeling, to the naked eye low brightness differential sensitive, high-brightness difference can not be clearer distinction. This requires that the devices led to non-linear vision correction, low brightness differential compression, expanding high-brightness difference, so that shows that the actual level of ash poor physical feeling with the naked eye. This approach will increase the difficulty of computing and computing capacity, circuit design will be more complicated.
To address these two issues, raising effect, designed to reduce the difficulty to ensure system reliability and maintainability, the Canal Corporation from 1998 to the beginning of the ultra-large-scale integrated chip design work. The integrated chip density of 80,000 circuits, using hardware description language design, abandoned small-scale integration devices use, by adding a large number of complex logic operations. The canal company that paved the results of these two major technical obstacles, thus greatly enhancing the systems performance.
The canal 256 gray super-integrated video display control system using centralized control of the design, use of the unique 8421 encoding data flow control control scheme design is completed, thus greatly enhancing the control of the display led the accuracy, stability , Reliability, a large number of complex visual computing correction to improve the visual color gray-level. Gray led the 256 display in brightness, color smoothing over, such as contrast There is a great improvement, an increase of stitching can be arbitrary, can be charged plug, use of anti-static, and other features. These are great limits to meet the display is led semi-permanent electronic products this request. In this way, production, installation, maintenance, upgrades have become convenient easy. 90% of the control process concentrated in the main control system, and the main display only the basic driver circuit, but not complicated control circuits, thus increasing the overall system reliability and maintainability, and greatly reduce the control Line costs, reduced hardware costs led the screen.