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LED Display Related Knowledge Tutorial

[1] Use the following abbreviations and definitions for LED display

　　1, LED light-emitting diode: the abbreviation of ligth emitting diode LED light-emitting diode

　　2. LED display | display device: LED panel is used to display text, text, graphics, images, animation, market information and other information through certain control methods, as well as a display screen composed of LED device arrays with TV and video signals.

　　3. Display unit: display unit The smallest unit of the LED display screen determined by the circuit and installation structure and has the display function.

　　4. Fatal disqualification: critical defect is the disqualification that may cause harm or unsafe conditions to the use, maintenance of the product or the personnel related to it, or the important characteristics of the unit product do not meet the requirements or the quality characteristics of the unit product seriously do not meet the requirements.

　　5. Out-of-control point: out-of-control point The basic luminous point of the LED whose light-emitting state does not match the display state required by the control and is discretely distributed.

　　6. Pseudo-color LED display: a pseudo-color LED panel is installed in different areas of the LED display, which is composed of single-color LED devices of different colors.

　　7. Full-color LED display: all-color LED panel is composed of red, green and blue LED devices and can be adjusted to a variety of colors of LED display.

[2] LED display classification

　　 1. Use environment: LED display screens are divided into indoor LED display screens and outdoor LED display screens according to their use environment.

　　2. Display color: LED display screens are divided into single-color LED display (including pseudo-color LED display), dual-color LED display and full-color (three-color) LED display according to their display colors. According to the gray scale, it can be divided into 16, 32, 64, 128, 256 gray scale LED display screens and so on.

　　3. Display performance: LED displays are divided into text LED displays, graphic LED displays, computer video LED displays, TV video LED displays, and market LED displays according to their display performance. Market LED displays generally include LED displays for securities, interest rates, futures and other purposes.

4. Among the basic non-market LED displays with luminous points, indoor LED displays can be divided into Φ3mm, Φ3.75mm, Φ5mm, Φ8mm, and Φ10mm according to the LED single point diameter used; outdoor LED displays are based on the adopted LED display. The pixel diameter can be divided into LED display screens such as Φ19mm, Φ22mm and Φmm26. The market information LED display 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 according to the size of the digital tube used. cm (3inch) and other LED displays.

[3] The hardware and software environment of the LED display

　　 1. Hardware usage environment

　　The hardware part of the LED display includes a general-purpose computer part, communication line, special data conversion part and display part determined according to the type, area, and use site of the LED display. A detailed description should be given:

　　 (1) Requirements for the computer host, various optional plug-in cards, external equipment and communication interfaces;

　　 (2) Requirements for communication lines and indicate the maximum communication distance;

　　 (3) The communication method between the data conversion part and the host computer;

　　 (4) Power supply requirements and structural installation requirements.

　　2, software use environment

　　 LED displays with different performance should be equipped with display software that can meet the requirements of their display functions. The software has the following functions:

　　 (1) Meet the requirements of serialization and standardization, and be backward compatible;

　　 (2) Use the operating system and language specified in the detailed specification;

　　 (3) Equipped with complete self-check procedures and various levels of diagnostic procedures as required;

　　 (4) Equipped with corresponding dedicated software for special-purpose LED displays.

[4] Appearance and material

　　 1. Appearance: There is no obvious scratch on the outer frame of the LED display. The pixel tubes of the outdoor LED display should be installed uniformly, without loosening or breaking the tube shell.

　　2. Material: The LED display can be made of steel, aluminum, wood and other materials. The structure is required to be strong and beautiful.

[5] Safety, power supply|stabilizer, temperature and humidity

    1. Security

　　LED display is a Class I safety equipment specified by GB4943.

　　 (1) LED display protection ground terminal.

　　 (2) Safety signs: ①The protective ground terminal of the display should be marked; ②The LED display should have warning signs at the fuse and switch power supply.

　　 (3) Earth leakage current: The earth leakage current of the LED display should not exceed 3.5mA (AC effective value).

　　 (4) Dielectric strength: The LED display screen can be used with a test voltage of 50HZ, 1500V (AC effective value) for 1 minute and no insulation breakdown should occur.

2. Power supply: The power supply of the LED display is 220W±10%, 50HZ±5% or 80V±10%, 50HXZ±5%, the maximum power consumption per unit display area of various LED displays should be specified in the detailed specifications Or the total power consumption of the LED display.

　　3, temperature:

　　 The ambient temperature of the indoor screen is: working environment low temperature: 0°C; high temperature: +40°C. Storage environment: low temperature: -40°C; high temperature: +60°C.

　　The ambient temperature of the outdoor screen is: working environment low temperature: optional -20°C, -10°C; high temperature: +50°C. Storage environment: low temperature: -40°C; high temperature: +60°C.

　　4. Humidity: At the highest operating temperature, the LED display should be able to work normally under the condition of a relative humidity of 90%.

[6] LED display performance characteristics

　　1. Performance: The text LED display screen and the graphic LED display screen should have the moving in and out mode and display mode specified in the detailed specification. Computer video LED display should have: animation function. It is required that the animation display of the LED display screen is consistent with the display of the corresponding area of the computer display; the text display function. Requires text display to be stable and clear crosstalk; grayscale function. It is required to have the gradation level specified in the detailed specification. In addition to the functions of animation, text display, and grayscale, the TV video LED display should be able to show TV and video images. The quotation LED display has the corresponding quotation display capability.

　　2. Uniformity: The requirements for the uniformity of the LED display should be specified in the detailed specification.

　　3. Out-of-control point: the out-of-control point of the indoor LED display should not be more than three ten thousandths, and the out-of-control point of the outdoor LED display should not be more than three thousandths; and it is discretely distributed.