LED electronic display screen integrates microelectronic technology, computer technology and information processing, and has the advantages of bright colors, wide dynamic range, high brightness, long service life, stable and reliable work. LED display screen is widely used in commercial media, cultural performance market, stadiums, information release, news release, securities trading and other fields, which can meet the needs of different environments.
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LED screen can realize the conversion between different forms of information presentation, and can be used indoors and outdoors, which has incomparable advantages over other display screens. It has the characteristics of high brightness intensity, low power consumption, low voltage demand, small and convenient equipment, long service life, stable impact resistance and strong anti-interference ability, and has developed rapidly and been widely used in various fields.
The luminous color and luminous efficiency of LED are related to the material and technology of making LED. At first, the bulbs were all blue, and then the fluorescent powder was added. Adjust different light colors according to different needs of users. There are four widely used colors: red, green, blue and yellow.
Because the working voltage of LED is low (only 1.2~4.0V), it can actively emit light with a certain brightness, the brightness can be adjusted by voltage (or current), and it is shock-resistant, vibration-resistant and has a long service life (65438+100000 hours), so there is no other display mode comparable to LED display mode in large-scale display equipment. ?
LED, light emitting diode (short for light emitting diode). It is a diode made of gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N) and indium (In) by controlling the display mode of a semiconductor light-emitting diode. When electrons and holes recombine, they can emit visible light, so they can be used to make light-emitting diodes.
Used as an indicator light in circuits and instruments, or as a text or digital display. Gallium arsenide phosphorescent diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light, and indium gallium nitride diodes emit blue light.
A display screen made of red and green led chips or tubes together as a pixel is called a three-color or two-color screen, and a display screen made of red, green and blue LED chips or tubes together as a pixel is called a three-color screen or a full-color screen. If there is only one color, it is called monochrome or monochrome screen.
The pixel size of indoor LED screen is generally 1.5- 12 mm, and several LED dies that can produce different primary colors are often packaged as a whole. The pixel size of outdoor LED screens is mostly 6-4 1.5 mm, and each pixel consists of several monochromatic LEDs. Common finished products are called pixel tubes, and bicolor pixel tubes are generally composed of 2 red and 1 green.
Whether LED is used to make monochrome, two-color or three-color screens, the brightness of each LED that needs to form pixels to display images must be adjustable, and the fine degree of adjustment is the gray level of the display screen. The higher the gray level, the finer the displayed image, the richer the color, and the more complicated the corresponding display control system.
Generally, the color transition of 256-level gray images is very soft, while the color transition boundary of 16-level gray images is very obvious. Therefore, at present, color LED screens are required to be made of 256 to 4096 gray levels.
Reference source Baidu Encyclopedia -led display