LED definition

In some of the PN junction semiconductor materials, into a small number of the carrier and the majority of the carrier when the complex will be redundant in the form of light energy to release in order to directly convert electrical energy into light energy. PN junction reverse voltage increases, the minority-carrier injection is difficult, it is not luminous. This use of injection-EL produced by the principle called diode LED, or LED.

LED light and color LED light-emitting efficiency and the production of materials and technology relating to the current widespread use of the red, green and blue. As the low-voltage LED (only 1.5-3V), to take the initiative to have a certain brightness light-emitting and brightness while using voltage (or current) regulation, impact resistance itself, anti-vibration long life (100,000 hours), so in the large-scale Display equipment, there is no other display LED display with the match.

The red and green LED together as a pixel screen is called the production of two-color screen or color screen; the red, green and blue LED tubes of the three together as a pixel screen is called tri-color screen or Full-color screen.

Whether used to produce LED monochrome, dual-color or tri-color screen, the images need to want to show that constitute each pixel brightness of the LED must adjust its regulation of the level of fine is the display of gray level. The higher the level of gray, showing images of the more delicate, more color-rich, shows that the control system is also more complex. General 256 gray image, the color of the transition has been very soft, and 16 of the gray color images, color transition line is very clear. Therefore, the current color LED screen all requests made of 256 gray.

LED display working principle

LED display is a set of optical electronics and computer technology in one high-tech products,

LED performance characteristics

LED text display and LED graphic display should be provided in the detailed specification of the way into and out of the display.

LED video screen computer should have: animated feature. LED display screen animation request with the computer monitor displayed the same corresponding to the region; text display. Require stability in the text, clear crosstalk; gray function. With the requirements detailed in the norms laid down in the level of gray. In addition to the LED video screen TV with animation, text, gray-scale functions, should be able to show on television, the video screen. LED display market with its corresponding ability to display prices.

LED displays how classification

LED display can be based on the following conditions:
The use of the environment LED display is divided into the indoor environment by the use of LED displays and outdoor LED display.

Color LED display screen according to the color display is divided into single-color LED display (including pseudo-color LED display), two-color LED display and full-color (trichromatic) LED display. By gray-scale can be divided into 16,32,64,128,256 gray-level LED display, and so on.

Performance LED display screen shows the performance according to the text is divided into LED display, LED graphic display, LED video screen computer and television screens and LED video LED screen market, and so on. LED display market in general, including securities, interest rates, futures and so on the use of LED display.

The basic point of non-market-type light-emitting LED display, LED indoor LED screen used by a single point in diameter can be divided into Φ3mm, Φ375mm, Φ5mm, Φ8mm, and Φ10mm display, and so on; outdoor LED display used by the pixel diameter Can be divided into Φ19mm, Φ22mm and Φmm26 such as the LED display. LED-type display market by using digital pipe size can be divided into 2.0cm (0.8inch), 2.5cm (1.0inch), 3.0cm (1.2inch), 4.6cmm (1.8inch), 5.8cm (2.3inch), 7.6 cm (3inch), and other LED display.

LED screen to assess how good or bad?

Indoor LED display points out of control out of control point of not more than three ten thousandths, outdoor LED display should be out of control of not more than three thousandths, and for the discrete strong;

Consistency of the LED screen better consistency, the entire screen brightness to be balanced, no color;

Security without security, leakage, and leakage should be no more than 3.5mA (AC RMS); Anti-point intensity, LED display can be 50Hz, 1500V (AC RMS) of the experiment should not have happened Lmin voltage insulation breakdown ; At the same time, LED display at the Department fuse and switching power supply should be a warning sign;

Appearance, LED display frame no scratches. Outdoor LED display pixel pipes should be installed, without loosening of the shell and tube rupture;

Structure, LED display can be part of the steel, aluminum, wood, and other materials, structural requirements of sturdy and beautiful.


Reference link: http://www.17led.com/LEDdisplay/2008-03/11.html