1 Introduction
Since the birth of LED, its luminous efficiency and luminous intensity have developed rapidly. The main application areas of LED include traffic lights, lighting, full color LED display, car lights, background light sources and white LED solid lighting. Since the red LED has a luminous intensity of up to 10,000 mcd and a general product of more than 1,000 mcd, the green LED has a luminous intensity of up to 8,000 mcd, and the blue LED luminous intensity has recently been greatly improved. Therefore, the brightness of the outdoor full color screen can generally reach 5,000 cd/m2 or more. The maximum brightness of liquid crystal televisions (LCDs), plasma televisions (PDPs) and picture tube televisions (CRTs) can only reach several hundred cd/m2, and the brightness of DLP is lower. Moreover, the LED display has high reliability, low driving voltage, long life and fast response. Therefore, the use of LEDs for outdoor large screens is unmatched by other display devices. Full-color high-brightness LED large-screen displays have been widely used in various fields such as finance, securities, transportation, airports, railways, stadiums, commercials, and post and telecommunications.
In the mid-1980s, multicolor and monochrome displays were introduced, initially as text screens and animated screens. From the development of electronic computer technology and integrated circuit technology in the early 1990s, the video technology of LED display screens has been realized.
LEDs have several advantages over incandescent and fluorescent lamps. They are smaller (crystals can be cut into cubes smaller than the nib), lighter and stronger (no glass shell); low power consumption (low power consumption can be as low as incandescent) One tenth), long life (a dozen times the life of ordinary light bulbs). LEDs will trigger a new light source revolution since the advent of incandescent lamps. In the 21st century, it will profoundly affect society, economy and culture, as well as art and other art forms. For example, new high-tech buildings are decorated with LEDs. At night, the entire building looks bright and gives a feeling of flowing light.
The high brightness of the LED makes it a superior location in the large outdoor screen. The Nasdaq full-color screen in Times Square, USA, is 120 feet by 90 feet, or 1005 square meters, made of 19 million ultra-bright, red, green, and blue LEDs.
2. The latest development of Tianjin Optoelectronic Planet LED display
2.1 The adoption of point-by-point adjustment and correction techniques can adjust and correct the brightness and chromaticity of each LED, greatly improving the consistency of the display image.
2.2 Modular design eliminates the limitations on the shape and aspect ratio of the display.
2.3 The red, green and blue LEDs in each pixel can be independently controlled to achieve a perfect visual effect.
2.4 Unparalleled brightness, making the image more clear and vivid even under the direct illumination of outdoor sunlight.
2.5 Remote wireless LED information release system applied to residential LED display
Photoelectric Planet uses a remote wireless LED display information release system to install more than 300 outdoor 10000-point LED displays for a media company. The display is now mainly used in Tianjin commercial residential areas to achieve synchronized screen playback, daily real-time weather. Forecast, travel reference, healthy diet and other services to the community owners, become a model of modern new districts.
LED-200 builds a remote wireless LED display information release system, which can be used to build a remote wireless LED information release system without installation wiring, real-time communication and low cost, and is widely used in taxis, buses, and community billboards. application.
2.6 arc type LED full color electronic display
In order to meet the technical requirements of foreign users' LED display screens, Tianjin Optoelectronic Planet has successfully designed the first circular display with the true meaning in China. The display arc radius is 470mm and the central angle is 5.625°. It will be installed in The LED displays on the adjacent two walls are connected to form a complete display. The display changes the arrangement of the traditional LED display LEDs and changes the way the signals are displayed. Change the general signal horizontal transmission mode to the vertical signal transmission mode. The key technology of the circular display is to reduce the curvature of the unit display panel, improve the waterproof performance and the continuity of the viewing angle. The arc-shaped display unit housing is processed by a fully digital machine tool to ensure design accuracy requirements. At present, the display has been exported to foreign countries and completed installation, and its good visual effect has been well received by users.