"Quick Guide for LED Display Industry Experts"

Frontier: LED display technology continues to develop, new application areas and market demands continue to emerge. As a practitioner in the LED display industry, it is very important to understand the basic concepts, technical principles, market trends and application scenarios of the industry. This article will provide you with a comprehensive LED display industry knowledge guide to help you quickly become an expert in the LED display industry.

1. LED: abbreviation for light emitting diode, is a semiconductor device that emits visible light.
2. Pixel: The smallest imaging unit of a display screen, usually consisting of a single or multiple light emitting diodes.
3. Pixel spacing (dot spacing): The center distance between two adjacent pixel points. The smaller the spacing, the shorter the visual distance.
4. Pixel density: The number of pixels per inch of the screen. The higher the pixel density, the richer the details of the display.
5. LED display module: A component composed of a quadrangular module integrating multiple rows and columns of light emitting diodes.
6. DIP: Dual in-line packaging technology is a form of packaging integrated circuit chips.
7. SMT: Surface mounting technology is currently the most popular technology and process in the electronic assembly industry.
8. SMD: Surface mounted device, which means surface mounted device.
9. LED display module: One of the main components of the LED display screen, consisting of LED lights, PCB circuit board, driver IC, resistor, capacitor and plastic kit.
10. LED display: A flat panel display consisting of small LED module panels used to display various information such as text, images, videos, and video signals.
11. Plug-in lamp module: A DIP-encapsulated lamp has its legs passed through the PCB board and tin filled the lamp holes through soldering. The module is made by this process. The advantages are high brightness and good heat dissipation, and the disadvantage is low pixel density.
12. Surface mount module: A module made by soldering the SMT-packaged lamp to the surface of the PCB through a soldering process, and the lamp feet do not need to pass through the PCB. The advantages are good display effect and high pixel density, which is suitable for indoor viewing; the disadvantages are that the brightness is not high enough and the heat dissipation of the lamp tube itself is not good enough.
13. Sub-surface mount modules: For products between DIP and SMT, the packaging surface of the LED lights is the same as SMT, but the positive and negative pins are the same as DIP's, and are also soldered through the PCB during production. The advantages are high brightness and good display effect. The disadvantages are complex process and difficult maintenance.
14. Brightness of the LED display: When the display works normally, the luminous intensity per unit area, in cd/m2.
15. 3 in one: SMT lamps packaged with three different colors of RGB LED chips are vertically juxtaposed together at a certain spacing. The advantage is that it has all the advantages of three-in-one, and can also solve various shortcomings of three-in-one; the disadvantage is that the process is complex and maintenance is difficult.
16. Dual primary color: Display consisting of two colors: red, green or yellow and green.
17. False color: A display composed of three different colors: red, yellow green, and blue.
18. Full color: A display composed of three different colors: red, pure green, and pure blue.
19. Luminous brightness: The luminous flux emitted by a monochromatic light source per unit solid angle in a given direction. The international unit is candela, abbreviated to cd.
20. Brightness level: The level of manual or automatic adjustment of the brightness of the entire screen from the lowest to the highest brightness.
21. Gray level: The gray level of an LED display is an indicator that reflects the image level of the display screen. It is generally divided into 64, 128, 256, 512, 1024, 2048, 4096, etc.
22. Maximum brightness: Under a certain environmental illumination, the brightness of each primary color of the LED display at the maximum brightness and maximum gray level.
23. Moiré: Irregular water ripples that appear on the LED display screen when shooting a full-color LED display at work.
24. PCB: Printed circuit board is the support body of electronic components and the carrier for electrical connection of electronic components.
25. Unit board specification: The size of the unit board is usually expressed in the expression of unit board length multiplied by width, in millimeters.
26. Resolution of the cell panel: The number of pixels on a cell panel is usually expressed by the expression of the number of rows of pixels on the cell panel multiplied by the number of columns.
27. BOM: Bill of Materials is a technical document that defines the structure of a product. It is also the most popular technology and process in the electronic assembly industry.
28. White balance: The balance of white, that is, the balance of the brightness ratios of the three colors of RGB.
29. White balance adjustment: Adjustment of the brightness ratio and white coordinates of the three RGB colors.
30. Contrast ratio: Under a certain environmental illumination, the ratio of the maximum brightness of the LED display to the brightness of the background.
31. Color temperature: The color emitted by the light source is at the same time as the color of the light radiated by the black body at a certain temperature. The temperature of the black body is called the color temperature of the light source.
32. Color difference: The LED display consists of a combination of red, green and blue to produce various colors, but these three colors are made of different materials, and the viewing angle is different. The spectral distribution of different LEDs is changed. These differences can be observed. called color difference.
33. Frame changing frequency: The number of times the display screen information is updated per unit time.
34. Refresh frequency: The number of times the display screen is repeatedly displayed on the display screen in unit time.
35. Angle of view: When the brightness in the observation direction drops to 1/2 of the brightness of the normal of the LED display screen, the angle formed by the two observation directions on the same plane and the normal direction.
36. Viewable angle: You can just see the direction of the image content on the display screen and the angle formed by the normal to the display screen.
37. Best viewing angle: You can just see the content on the display without being flat, and the angle formed between the direction where the image content is clearest and the normal.
38. Best viewing distance: You can just see the content on the display screen completely without being flat, and the vertical distance relative to the screen body where the image content is the clearest.
39. Out-of-control point: Pixel points whose luminous status does not meet the control requirements are divided into three types: blind spot, constant bright spot, and flash point.
40. Static driving: Point-to-point control is implemented from the output pin of the driving IC to the pixel point"".
41. Scan driving: Point-to-column control is implemented from the output pin of the driver IC to the pixel point"".
42. Constant current drive: In the working environment allowed by the drive IC, the constant current value specified in the output design is constant.
43. Constant voltage drive: In the working environment allowed by the driver IC, the constant output voltage value specified during design.
44. The aspect ratio of the LED display: the graphic screen is determined according to the content displayed; the video screen is generally 4:3 or close to 4:3; the ideal ratio is 16:9.
45. Points that a set of control system can control: Communication screen A