Basic knowledge of LED display screen（3）

4. Classification introduction

(1) Divided into indoor, outdoor and semi-outdoor according to the use environment:

The indoor screen area is generally less than 1 square meter to more than ten square meters. The indoor LED display is used in indoor environment. This type of display has moderate brightness, large viewing angle, close color mixing distance, light weight and high density. It is suitable for closer viewing. .

The outdoor screen area is generally from a few square meters to tens or even hundreds of square meters, the point density is relatively thin (more than 2500-1000 points per square meter), the brightness of the light is 5500-8500cd / square meter (different direction, different brightness requirements), in the sun It is used under direct shooting conditions, and the viewing distance is several tens of meters away. The screen body has good wind, rain and lightning protection capabilities.

The semi-outdoor screen is between the outdoor and the indoors. It has a high luminous brightness and can be used outdoors under direct sunlight. The screen has a certain seal, usually under the eaves or in the window.

(2) Divided into single color, double primary color, and three primary colors (full color) according to color:

Monochrome refers to a luminescent material with only one color on the display, mostly single red, and yellow green in some special occasions (such as funeral homes).

The dual primary color LED display consists of red and green LED lights, and the 256-level gray dual-color display can display 65,536 colors (two-color screen can display red, green, and yellow colors).

The full-color LED display consists of red, green and blue LED lights that display white balance and 16,777,216 colors.

(3) Synchronous and asynchronous according to control or usage:

Synchronous mode means that the LED display works basically the same as the monitor of the computer. It maps the computer image to the map on the real monitor with an update rate of at least 30 fields/second, usually with multi-gradation color display. Ability to achieve multimedia advertising effects.

Asynchronous mode means that the LED screen has the ability to store and play automatically. The edited text and non-grayscale pictures on the PC are transmitted to the LED screen through the serial port or other network interface, and then automatically played by the LED screen offline. Generally, there is no gray. The display capability is mainly used to display text information and can be multi-screened.

(4) Divided by pixel density or pixel diameter:

P1.58 400689 points / square meter

P1.9 277000 points / square meter

P2.0 250000 points / square meter

P2.5 160000 points / square meter

P3 111111 points / square meter

P4 62500 points / square meter

P5 40000 points / square meter

P6 27777 points / square meter

P7.62 17222 points / square meter

P8 15625 points / square meter

P10 10000 points / square meter

Pixel diameter and number of pixels of the outdoor screen:

P10 10000 points / square meter

P12.5 6400 points / square meter

P16 3906 points / square meter

P20 2500 points / square meter

P25 1600 points / square meter

P31.25 1024 points / square meter

According to the display performance can be divided into:

Video display: generally full color display

Text display: generally single color display

Graphic display: generally dual-color display

Market display: generally digital tube or single primary color display;

LED video display: The display device is composed of many light-emitting diodes, which can display various video files such as video and animation.

Conventional LED display: The display is fixed in one position with a steel structure. The main common ones are outdoor large single-column LED advertising screens, as well as single and two-color LED displays installed on the wall for playing the train information.

Rental LED display: At the time of design, the R&D department considers that the screen is often used for installation and disassembly. Therefore, the left and right cabinets are fast-locked with positioning function, and the positioning is accurate. The entire cabinet is installed within 10 seconds. Rental LED screens are mainly used for stage performances, wedding venues and large spring festivals.