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For those who do not understand LED display, but also need to purchase LED display, it is necessary to understand the basic knowledge of LED display before purchasing, you can choose The most suitable LED display that you need, you can also learn from the friends who are new to LED display. Here we will introduce the basic knowledge of LED display:
1. What is a pixel?
The minimum illuminating pixel of the LED display has the same meaning as the "pixel" in the ordinary computer display;
2. What is the pixel distance (point spacing)?
The distance from the center of one pixel to the center of another pixel;
3. What is the LED display module?
A small unit consisting of several display pixels that are structurally independent and can form an LED display.
4. What is DIP?
DIP is the abbreviation of Double In-line Package, in-line assembly;
5. What is SMT? What is SMD?
SMT is the surface mount technology (short for Surface Mounted Technology), which is currently in the electronics assembly industry. One of the most popular technologies and processes; SMD is a surface-mounted device (short for Surface mounted device);
6. What is an LED display module?
The basic unit defined by the circuit and the installation structure and having the display function and capable of realizing the display function by simple assembly;
7. What is the LED display?
A display screen composed of an array of LED devices by a certain control method;
8. What is a plug-in module?
What are the advantages and disadvantages? It means that the lamp of DIP package passes the lamp foot through the PCB board, and the tin is filled in the lamp hole by soldering. The module made by this process is the plug-in module; the advantage is that the viewing angle is large, the brightness is high, and the heat dissipation is good. The disadvantage is that the pixel density is small;
9. What is a surface mount module?
What are the advantages and disadvantages? The surface mount is also called SMT. The SMT packaged lamp is soldered to the surface of the PCB by soldering process. The lamp pin does not need to pass through the PCB. The module made by this process is called the surface mount module. The advantage is: the viewing angle is large. The display image is soft, the pixel density is large, suitable for indoor viewing; the disadvantage is that the brightness is not high enough, the heat dissipation of the lamp itself is not good enough;
10. What is the double primary color, full color display?
Different color LEDs can be used to form different display screens. The two primary colors are composed of red, green or yellow and green. The full color is composed of three different colors: red, pure green and pure blue.
11. What is luminous? brightness?
The intensity of light emitted by the unit area of the LED display, in cd/m2, is simply the intensity of light emitted by a display of one square meter;
12. What is the brightness level?
The number of levels of manual or automatic adjustment of the brightness of the entire screen from the lowest to the highest brightness;
13. What is the gray level?
At the same brightness level, the technical processing level between the darkest and the brightest display;
14. What is the maximum brightness?
Under a certain ambient illumination, the primary color of the LED display is at the maximum brightness and maximum gray level;
15. What is a PCB?
PCB is (short for Printed Circuit Board) printed circuit board;
16, what is white balance?
What is white balance adjustment? The white balance we mean is the balance of white, that is, the balance of the brightness of the three colors of R, G, and B: 3:6:1; the ratio of the brightness of the three colors of R, G, and B, and the adjustment of the white coordinates. Called white balance adjustment;
17, what is contrast?
Under certain ambient illumination, LED
The ratio of the maximum brightness of the display to the background brightness;
18. What is the color temperature?
When the color of the light emitted by the light source is the same as the color of the black body at a certain temperature, the temperature of the black body is called the color temperature of the light source.
19. What is the frame change frequency?
The number of times the display screen information is updated in a unit time;
20. What is the refresh rate?
The number of times the display is repeatedly displayed by the display;
21, what is the angle of view?
What is the angle of view? What is the best perspective? The viewing angle is the angle between the two viewing directions of the same plane and the normal direction when the brightness of the viewing direction drops to 1/2 of the brightness of the normal direction of the LED display screen. Divided into horizontal and vertical viewing angles; the viewing angle is just the direction of the image content on the display, and the angle formed by the normal of the display; the best viewing angle is just enough to completely see the content on the display, and No color cast, the sharpest direction of the image content and the angle formed by the normal;
22, what is the best line of sight?
It is just enough to completely see the content on the display, and does not color cast, the clearest position of the image content relative to the vertical distance of the screen;
23, what is the point of loss? How many?
Pixels whose illumination state does not match the control requirements; the out-of-control points are divided into: blind spot (also known as dead point), constant bright point (or dark point), and flash point;
24. What is static driving? What is a scan driver? What is the difference between the two?
The "point-to-point" control from the output pin of the driver IC to the pixel is called static drive; the control of "point-to-column" from the output pin of the driver IC to the pixel is called scan drive, which requires a row control circuit; It can be clearly seen from the driver board: the static drive does not require a row control circuit, and the cost is high, but the display effect is good, the stability is good, the brightness loss is small, etc.; the scan drive requires a row control circuit, but the cost is low. Poor display, poor stability, large loss of brightness, etc.;
25, what is constant current drive? What is a constant voltage drive?
Constant current refers to the current value specified in the constant output design in the working environment allowed by the driver IC; constant voltage refers to the voltage value specified in the constant output design within the working environment allowed by the driver IC;
26,What rated operating voltage? What is the working voltage? What is the supply voltage?
The rated working voltage refers to the voltage when the appliance is working normally; the working voltage refers to the voltage value of the appliance under the rated voltage range and normal operation; the supply voltage is divided into AC and DC supply voltage, and our display screen AC supply voltage All are AC220V~240V, DC power supply voltage is 5V;
27, What is color distortion?
It means that the same object is displayed in nature and on the display screen, and the difference between the two is about the human sensory vision;
28. What is a synchronous system, what is an asynchronous system?
Synchronous and asynchronous are relative to the computer, the so-called synchronous system , refers to the LED display control system displayed on the display and the computer display synchronously; the asynchronous system means that the computer-edited display data is stored in the display control system in advance, and the LED display will not be affected after the computer is turned off. The normal display of the screen, such a control system is an asynchronous system;
29, what is the blind spot detection technology?
Through the host computer software and the underlying hardware, the blind spot (LED open and short circuit) on the display screen can be detected and a report is generated to tell the LED Screen manager, such a technology is called blind spot detection technology;
30, what is power detection?
Through the host computer software and the underlying hardware, can detect the working status of each power supply on the display, and form a report to tell the LED screen Manager, such a technology is called power detection technology;
31, what is brightness detection? What is brightness adjustment?
Brightness in brightness detection refers to the ambient brightness of the LED display, through the light sensor, the display is currently in The ambient brightness is detected. This detection method is called brightness detection. The brightness mentioned in the brightness adjustment refers to the brightness of the light emitted by the LED display. The detected data is fed back to the LED display control system or the control computer, and then according to this data. Adjust the brightness of the display, called brightness adjustment;
32, what is remote control? Under what circumstances?
The so-called remote is not necessarily a long distance. The remote control includes the main control terminal and the controlled terminal in a local area network, and the spatial distance is not far; and the main control terminal and the controlled terminal are within a relatively long distance; the customer requests or directly exceeds the optical fiber according to the customer control position. Control the distance, then use remote control;
33, what is fiber transmission? What is network cable transmission?
Optical fiber transmission is to convert electrical signals into optical signals by transparent glass fiber transmission; network cable transmission is to use metal wires to directly transmit electrical signals;
34. Under what circumstances use network cables? When do you use fiber?
When the distance between the display screen and the control computer is less than 100M, it is transmitted by the network cable; when the distance between the two is less than 500M and greater than 100M, the multimode fiber is used, when the distance is greater than 500M, the single mode fiber is used;
35, what is the local area network control? What is internet control?
In the LAN, another computer is controlled by one computer or connected to other external devices. This control method is called LAN control; the main controller achieves the control purpose by accessing the IP address of the controller in the Interner network. , called Internet Control;
36, What is DVI? What is VGA?
DVI is the abbreviation of Digital Video Interface, which is a digital video interface. It is the present country A universal digital video signal interface; the full name of VGA in English is Video Graphic Array, which is a display graphics array. It is the R, G, B three analog output video signal interface;
37, what is the PCI slot?
PCI slot is based on the PCI local bus (Pedpherd Component Interconnect) expansion slot, PCI slot It is the main expansion slot of the motherboard. It can get almost all external functions that can be realized by the computer by plugging in different expansion cards.
38. What is GPRS?
GPRS is a general packet radio service (General Packet Radio Service), which is in the existing GSM system. A new bearer service developed on the basis of radio communication; GSM is a mobile phone card wireless communication.