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First, use the following abbreviations and definitions led display 1, LED light-emitting diodes: ligth emitting diode LED light-emitting diodes 2, LED display | display device: LED panel through a certain control method, used to display text, text, Various information such as graphics, images, animations, and quotes, as well as display screens composed of LED and video signals and arrays of LED devices.
3. Display unit: The smallest unit of the LED display that is determined by the circuit and the installation structure and has a display function.
4. Fatal failure: Critical defect may cause harm or unsafe condition to the use, maintenance or related personnel, or the important characteristics of the unit product do not meet the requirements or the quality characteristics of the unit product are not in conformity with the regulations.
5, out of control points: out-of-control point The state of illumination does not match the display state of the control requirements and is a discrete distribution of LED basic light points.
6, pseudo-color LED display: pseudo-color LED panel in different areas of the LED display to install LED display of different color single-color LED devices.
7, full-color LED display: all-color LED panel consists of red, green, blue three primary color LED devices and can be adjusted to a variety of color LED display.
Second, the LED display classification 1, the use of the environment: LED display is divided into indoor LED display and outdoor LED display according to the use environment .
2, display color: LED display according to the display color is divided into single primary color LED display (including pseudo color LED display), dual primary color LED display and full color (three primary color) LED display. According to the gray level, it can be divided into 16, 32, 64, 128, 256 gray LED display.
3, display performance: LED display according to display performance is divided into text LED display, graphic LED display, computer video LED display, TV video LED display and market LED display. The market LED display generally includes LED displays for securities, interest rates, futures, and the like.
4, the basic light point non-line type LED display, indoor LED display according to the LED single point diameter can be divided into Φ3mm, Φ3.75mm, Φ5mm, Φ8mm, and Φ10mm display; outdoor LED display according to the use The pixel diameter can be divided into LED displays such as Φ19mm, Φ22mm and Φmm26. In the market type LED display, the size of the digital tube 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. LED display such as cm (3inch).
Third, the LED display hardware and software use environment 1, the hardware use environment LED display hardware part includes the general computer part, communication line, dedicated data conversion part and display part determined according to the type of LED display, area, use site and other conditions . A detailed description should be given:
(1) Requirements for computer mainframes, various optional plug-in cards, external devices, and communication interfaces;
(2) Requirements for the communication line and indicate the maximum communication distance;
(3) The communication mode between the data conversion part and the computer host;
(4) Power supply requirements and structural installation requirements.
2, the software use environment for different performance of the LED display should be configured to meet the display function requirements of the display software, the software has the following functions:
(1) Comply with serialization and standardization requirements, and can be backward compatible;
(2) Adopt the operating system and language specified in the detailed specification;
(3) It is equipped with a complete self-test procedure and various levels of diagnostic procedures as needed;
(4) The special-purpose LED display is equipped with its corresponding dedicated software.
Fourth, appearance and materials 1, appearance: LED display frame without obvious scratches. The outdoor LED display pixel tube should be installed consistently, without looseness and broken shell.
2, materials: LED display parts can be steel, aluminum, wood and other materials. The structure is required to be strong and beautiful.
Five, safety, power supply | voltage regulator, temperature and humidity 1, safety LED display is a Class I safety equipment specified in GB4943.
(1) LED display protection ground terminal.
(2) Safety mark 1 Display protection The ground terminal should be marked.
The 2 LED display should have a warning sign at the fuse and switching power supply.
(3) Earth leakage current: The earth leakage current of the LED display should not exceed 3.5mA (AC RMS).
(4) Anti-electricity strength: The LED display screen can be insulated with a test voltage of 50HZ and 1500V (AC rms) for 1 min.
2, power supply: LED display power supply is 220W ± 10%, 50HZ ± 5% or 80V ± 10%, 50HXZ ± 5% should specify the maximum power consumption of various LED display unit display area in the detailed specification 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: low temperature in working environment: optional -20 ° C, -10 ° C; high temperature: +50 ° C. Storage environment low temperature: -40 ° C; high temperature: +60 ° C.
4. Humidity: At the highest working temperature, the LED display should work normally at a relative humidity of 90%.
Sixth, LED display performance characteristics 1, performance: text LED display and graphic LED display should have the move in and out mode and display mode specified in the detailed specification. The computer video LED display should have: an animation function. It is required that the LED display animation display is consistent with the area corresponding to the computer display; the text display function. Requires text to display stable, clear crosstalk; grayscale function. It is required to have the grade gray scale specified in the detailed specification. In addition to animation, text display, and grayscale functions, the TV video LED display should be able to display TV and video images. The market LED display has the corresponding market display capability.
2. Uniformity: The requirements for the uniformity of the LED display should be specified in the detailed specification .
3, out of control points: the out-of-control point of the indoor LED display is not more than three ten thousandth, the out-of-control point of the outdoor LED display should be no more than three thousandth; and is discretely distributed
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