Detailed explanation of the basic knowledge of LED display and its characteristics

LED display basics

Modern society has entered the information age, information dissemination has become more and more important, and people's demands for visual media are getting higher and higher, requiring the media to reflect quickly, realistic (real-time), eye-catching (colorful, lifelike), The screen is super-large and powerful. In recent years, with the rapid development of microelectronics technology, automation technology and computer technology, the semiconductor manufacturing process has become more and more mature, resulting in smaller and smaller LED display points and higher resolution. The three primary colors (red, green, and blue) of the display light can be integrated into one body to achieve a full-color effect, so that the application range of the LED display screen is expanding.

LED display features

LED is the abbreviation of Light Emitting Diode. It is a widely used material for illuminating display in the field of optoelectronics. Different materials can be used to produce red, green, yellow, blue and other colors under certain conditions. LEDs have the following characteristics, making them Become the material of choice for making large screens:

â—†High brightness, the brightness of outdoor single lamp is close to 6,000mcd;

â—† Low power consumption and high photoelectric conversion efficiency;

â—†Long life, LED life is up to 200,000 hours or more;

â—† fast response, ns level, no residual ash;

◆ Low voltage and low current drive, easy to interface with the computer. ·Characteristics of LED display

Compared with other large screen displays, LED displays have the following characteristics:

â—†The screen size can be large or small, and the maximum can be 500m2.

◆The viewing angle is large, the indoor screen viewing angle is greater than ±80 degrees, and the outdoor screen viewing angle is greater than ±60 degrees.

â—†The line of sight can be adjusted by selecting products with different diameters and different dot pitches. It can be as small as several tens of centimeters and as large as several hundred meters. The minimum diameter of pixels can be 1.9mm.

â—†Flexible configuration, simple to digital display, complex to full-color video screens have different types of products to meet the requirements, indoor and outdoor have corresponding products.

â—† Easy to interface with computer, support software rich.

At present, other large-screen displays mainly have the following types, and their performances have their own advantages.

Screen type advantages and disadvantages

Magnetic flaps have low power consumption and low response speed, making it impossible to display video and high failure rate

TV wall full color with separate lines, low brightness, not suitable for text, can not be used outdoors

Projection full-color picture has low brightness and low brightness, can not be used outdoors, and has poor definition (uneven picture is uneven)

CRT full color cost, high power consumption, area can not be too large

PDP full color picture is delicate and costly, the angle of view is small, and the area cannot be too large

1.3 classification of LED display

1.3.1 According to the application site classification, depending on the application site, the LED display can be divided into indoor and outdoor.

The indoor screen is mainly used indoors. In the production process, the light-emitting die is first made into a dot matrix module (or digital tube), and then the module is spliced ​​into a certain size display unit board. According to user requirements, the display unit board is basically used. The units are spliced ​​to the size required by the user. According to the size of the pixel, the indoor screen is divided into Ф2, Ф3, Ф3.75, Ф4.8, Ф5, Ф8, Ф10, and the like.