In recent years, with the Beijing Olympic Games, Shanghai World Expo, and Guangzhou Asian Games, LED displays can be seen everywhere. The LED display screen can display changing numbers, text, and graphic images; it can be used not only in indoor environments but also in outdoor environments, and has advantages that projectors, TV walls, and LCD screens cannot match.

LED has been widely valued and developed rapidly, which is inseparable from its own advantages. These advantages are summarized as follows: high brightness, low operating voltage, low power consumption, miniaturization, long life, impact resistance and stable performance. The development prospect of LED is extremely broad, and it is currently developing towards higher brightness, higher weather resistance, higher luminous density, higher luminous uniformity, reliability, and full color.

1. Types of LED display

1. Classify according to color

Single-color display: single red or single green; dual-color display: red and green dual-primary colors, 256-level grayscale, can display 65536 colors; full-color display: red, green, blue three-primary colors, 256-level grayscale The full-color display can display more than 16 million colors.

2. Classify according to the constituent pixel units

Digital display screen: the display pixels are 7-segment digital tubes, suitable for making clock screens, interest rate screens, etc.;

Graphic display screen: the display pixels are dot matrix modules, suitable for playing text and image information;

Video display screen: Display pixels are composed of many light-emitting diodes, which can display various video files such as videos and animations.

3. Classification according to the location of use

Indoor display screen: small luminous point, dense pixel pitch, suitable for close viewing;

Semi-outdoor display screen: between indoor and outdoor, not rainproof, suitable for information guidance on the lintel;

Outdoor display screen: Large luminous point, large pixel pitch, high brightness, can work in the sun, with windproof, rainproof, waterproof functions, suitable for long-distance viewing.

4. According to the driving mode, there are static, horizontal scrolling, vertical scrolling and page turning display, etc.

2. Types and advantages and disadvantages of LEDs for display screens

According to the classification of the display screen, the pixel LEDs used can also be divided into the following types:

1. Dot matrix module

Advantages: low cost, mature processing technology, stable quality; Disadvantages: poor control of brightness and color consistency, prone to mosaic phenomenon;

2. Plug-in lamp

Advantages: the color consistency is relatively easy to control, and the size of the pixel pitch can be freely adjusted and combined according to needs; Disadvantages: the effect of red, green and blue color mixing is not good, the angle is not large, it is difficult to control the consistency of the angle, and it is easy to appear uneven, up and down, left and right in processing easy to misplace;

3. Patch

Advantages: Display color, color mixing effect, angle consistency, etc. are the best; Disadvantages: high cost of packaging and processing;