1: What is LED?
LED is the English abbreviation of light emitting diode (Light emitting diode), the "LED" in the display industry refers to the LED that can emit visible light band;
2 : What is a pixel?
The minimum light-emitting pixel of the LED display screen has the same meaning as the "pixel" in ordinary computer monitors;
3: What is the pixel distance (dot spacing)?
The distance from the center of one pixel point to the center of another pixel point;
4: What is LED display module?
It is composed of several display pixels, which is independent in structure and can form the smallest unit of LED display screen. Typical ones are "8×8", "5×7", "5×8", etc.
It can be assembled into modules through specific circuits and structures;
5: What is DIP?
DIP is the abbreviation of Double In-line Package, double in-line assembly;
6: What is SMT? What is SMD?
SMT is Surface Mounted Technology (abbreviation of Surface Mounted Technology), which is the most popular technology and process in the electronic assembly industry;
SMD is a surface mounted device (abbreviation of Surface mounted device);
7: What is LED display module?
The basic unit with display function determined by the circuit and installation structure, which can realize the display screen function through simple assembly;
8: What is LED display?
Through a certain control method, a display screen composed of an array of LED devices;
9: 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 fills the lamp hole with tin by welding. The module made by this process is the plug-in module; the advantages are large viewing angle, high brightness and good heat dissipation. ; The disadvantage is that the pixel density is small;
10: What is a surface mount module? What are the advantages and disadvantages?
Surface mount is also called SMT. The SMT packaged lamp is welded on the surface of the PCB board through a welding process, and the lamp pins do not need to pass through the PCB board. The module made by this process is called a surface mount module; the advantages are: large viewing angle, The display image is soft and the pixel density is high, which is suitable for indoor viewing; the disadvantage is that the brightness is not high enough, and the heat dissipation of the lamp itself is not good enough;
11: What is a subsurface mount module? What are the advantages and disadvantages?
Subsurface mount is a product between DIP and SMT. The packaging surface of the LED lamp is the same as that of SMT, but its positive and negative pins are the same as those of DIP. It is also soldered through PCB during production. The advantages are: high brightness and good display effect, the disadvantages are: complex process and difficult maintenance;
12: What is 3 in 1? What are its advantages and disadvantages?
It refers to encapsulating LED chips with three different colors of R, G, and B in the same colloid; the advantages are: simple production, good display effect, but the disadvantages are: it is difficult to split light and color, and the cost is high;
13: What is 3 and 1? What are its advantages and disadvantages?
3-in-1 was first innovated and used by our company in the same industry. It refers to the vertical juxtaposition of three independently packaged SMT lamps of R, G and B according to a certain spacing, which not only has all the 3-in-1 lights. Advantages, but also solve various shortcomings of 3 in 1;
14: What is dual primary color, pseudo color, full color display?
Different display screens can be formed by light-emitting diodes of different colors. The dual primary color is composed of red, green or yellow-green, the pseudo-color is composed of three different colors of red, yellow-green, and blue, and the full color is composed of red. , pure green, pure blue three different colors;
15: What is luminous brightness?
The light intensity emitted by the LED display screen per unit area, the unit is cd/㎡, which is simply the light intensity emitted by a square meter display screen;
16: What is the brightness level?
The level of manual or automatic adjustment of the brightness of the whole screen between the lowest and the highest brightness;
17: What is gray scale?
Under the same brightness level, the technical processing level of the display screen from the darkest to the brightest;
18: What is the maximum brightness?
Under a certain ambient illumination, when the primary color of the LED display is at the maximum brightness and maximum gray level;
19: What is a PCB?
PCB is (abbreviation of Printed Circuit Board) printed circuit board;
20: What is a BOM?
BOM is (abbreviation of Bill of material) bill of materials;
21: What is white balance? What is white balance adjustment?
What we call white balance refers to the balance of white, that is, the balance of the brightness of the three colors of R, G, and B in a ratio of 3:6:1; the brightness ratio of the three colors of R, G, and B and the adjustment of the white coordinates, called white balance adjustment;
22: What is contrast?
Under a certain ambient illumination, the ratio of the maximum brightness of the LED display to the background brightness;
23: What is color temperature?
When the color of the light emitted by the light source is the same 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.
24: What is the frame change frequency?
The number of times the display screen information is updated per unit time;
25: What is the refresh rate?
The number of times the display screen is repeatedly displayed by the display screen;
26: What is perspective? What is the viewing angle? What is the best viewing angle?
The viewing angle is the angle formed between the two viewing directions of the same plane and the normal direction when the brightness in the viewing direction drops to 1/2 of the brightness in the normal direction of the LED display. Divided into horizontal and vertical viewing angles;
The viewing angle is the angle formed by the direction in which the image content on the display screen can be seen, and the normal line of the display screen;
The best viewing angle is the angle formed by the clearest direction of the image content and the normal line that can just completely see the content on the display screen without color cast;
27: What is the optimal viewing distance?
It is the vertical distance between the position of the clearest image content and the screen body that can just completely see the content on the display screen without color cast;
28: What is a runaway point? How many?
Pixels whose luminous state does not meet the control requirements; out-of-control points are divided into three types: blind spot (also known as dead spot), constant bright spot (or dark spot), and flash point;
29: What is a static drive? 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 "point-to-column" control 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 effect, poor stability, large loss of brightness, etc.;
30: What is constant current drive? What is 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 in the working environment allowed by the driver IC;
31: What is nonlinear correction?
If the digital signal output by the computer is displayed on the LED display screen without correction, color distortion will appear. Therefore, in the system control circuit, the signal output by the original computer is calculated by a nonlinear function to obtain the signal required by the display screen. Since there is a nonlinear relationship between the before and after signals, we often call it nonlinear correction;
32: What is the rated working voltage? What is the working voltage? What is the supply voltage?
The rated working voltage refers to the voltage of the electrical appliance when it is working normally; the working voltage refers to the voltage value of the electrical appliance during normal operation within the rated voltage range; the power supply voltage is divided into AC and DC power supply voltages, and the AC power supply voltage of our displays is It is AC220V~240V, and the DC power supply voltage is 5V;
33: What is color distortion?
It refers to the difference between the sensory vision of the human eye when the same object is displayed in nature and on the display screen;
34: What is a synchronous system and what is an asynchronous system?
Synchronization and asynchrony are relative to the computer. The so-called synchronous system refers to the LED display control system in which the content displayed on the display screen is displayed synchronously with the computer monitor; the asynchronous system refers to the display data edited by the computer is stored in advance. In the display control system, the normal display of the LED display will not be affected after the computer is turned off. Such a control system is an asynchronous system;
35: What is blind spot detection technology?
Through the host computer software and the underlying hardware, blind spots (LED open and short circuits) on the display screen can be detected, and a report can be formed to tell the LED screen manager. Such a technology is called blind spot detection technology;
36: What is power detection?
Through the host computer software and the underlying hardware, the working conditions of each power supply on the display screen can be detected, and a report can be formed to tell the LED screen manager. Such a technology is called power supply detection technology;
37: What is brightness detection? What is brightness adjustment?
The brightness in brightness detection refers to the brightness of the environment where the LED display is located. Through the light sensor, the ambient brightness of the display is detected. This detection method is called brightness detection; the brightness mentioned in brightness adjustment refers to the LED display. The brightness of the light emitted, the detected data is fed back to the LED display control system or control computer, and then the brightness of the display screen is adjusted and adjusted according to this data, which is called brightness adjustment;
38: What is a real pixel? What is a virtual pixel? How many virtual pixels are there? What is pixel sharing?
Real pixel refers to the 1:1 relationship between the number of physical pixels on the display screen and the number of pixels actually displayed, how many points the display screen actually has, and only how many points of image information can be displayed;
Virtual pixel refers to the relationship between the number of physical pixels on the display and the number of pixels actually displayed, which is 1:N (N=2, 4), and it can display 2 or 4 times more image pixels than the actual pixels of the display;
According to the virtual control method, virtual pixels can be divided into: software virtual and hardware virtual; According to the multiple relationship, it is divided into: 2 times virtual and 4 times virtual;
39: What is remote control? Under what circumstances is it used?
The so-called remote does not necessarily mean long distance. 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 in a relatively long spatial distance; customer requirements or according to the customer's control position beyond the optical fiber direct control distance, then use remote control;
40: What is optical fiber transmission? What is network transmission?
Optical fiber transmission is to convert electrical signals into optical signals and use transparent glass fiber for transmission; network cable transmission is to use metal wires for direct electrical signal transmission;
41: Under what circumstances do you use a network cable? When to use fiber optics?
When the distance between the display screen and the control computer is less than 100M, use network cable for transmission; when the distance between the two is less than 500M and greater than 100M, use multi-mode fiber, and when the distance is greater than 500M, use single-mode fiber;
42: What is LAN control? What is Internet Control?
Inside the LAN, one computer controls another computer or the external devices connected to it. This control method is called LAN control; the main controller achieves the purpose of control by accessing the IP address of the controller in the Interner network. called Internet Control;
43: What is DVI? What is VGA?
DVI is the abbreviation of Digital Video Interface, that is, digital video interface. It is a digital video signal interface commonly used internationally;
The full English name of VGA is Video Graphic Array, that is, the display graphics array. It is R, G, B three analog output video signal interface;
44: What is a digital signal? What is a digital circuit?
Digital signal means that the value of the signal amplitude is discrete, and the amplitude value is limited to two finite values of 0 and 1; the circuit that processes and controls this signal is called a digital circuit;
45: What is an analog signal? What is an analog circuit?
Analog signal means that the value of the signal amplitude is continuous in time; the circuit that processes and controls this signal is called an analog circuit;
46: What is a PCI slot?
PCI slot is an expansion slot based on PCI local bus (Pedpherd Component Interconnect, peripheral component expansion interface).
The PCI slot is the main expansion slot of the motherboard. By plugging in different expansion cards, almost all the external functions that can be achieved by the current computer can be obtained;
47: What is an AGP slot?
Accelerated Graphics Interface. AGP is an interface specification that enables 3D graphics to be displayed at faster speeds on ordinary personal computers. AGP is an interface designed to deliver 3D graphics faster and more smoothly. It uses the main memory of a normal PC to refresh the image displayed by the monitor, and supports 3D graphics techniques such as texture mapping, zero buffering and alpha blending.
48: What is GPRS? What is GSM? What is CDMA?
GPRS is a general packet radio service (General Packet Radio Service), which is a new bearer service developed on the existing GSM system, mainly used for radio communication;
GSM is the abbreviation of the "Global System For Mobile Communication" standard (Global System for Mobile Communication) uniformly launched by the European Committee for Standardization in 1992. It adopts digital communication technology and unified network standards to ensure communication quality and develop more new services. user use.
Code Division Multiple Access (Code Division Multiple Access), a new and mature wireless communication technology based on spread spectrum technology;
49: Where is the use of GPRS technology for the display screen?
On the GPRS data network based on mobile communication, the data of our LED display screen is communicated through the GPRS transceiver module, which can realize the remote point-to-point small amount of data transmission! To achieve the purpose of remote control;
50: What is RS-232 communication, what is RS-485 communication, what is RS-422 communication? What are the advantages of each?
51: What is an ARM system? What is it good for for the LED industry?
ARM (Advanced RISC Machines), ARM is a company specializing in the design and development of chips based on RISC (reduced instruction set computer) technology. Can be thought of as the name of a technology. The signal control processing system constructed with the CPU containing this technology as the core is called the ARM system.
The LED special control system made of ARM technology can realize asynchronous control, and the communication methods can include: peer-to-peer network, local area network, Internet, and serial communication. It contains almost all PC interfaces;
52: What is a USB interface?
The English abbreviation of USB is UniversalSerialBus, which is translated into Chinese as "Universal Serial Bus", also known as Universal Serial Interface. It can support hot swap and can connect up to 127 PC external devices; there are two types of USB1.0 and USB2.0 interface standard;
53: What is the light fill factor?
In each square, the light-emitting area of each single pixel point is compared, such as 3-in-1 and 3-in-1, when the point distance is the same, the light-emitting area of 3-in-1 is larger than that of 3-in-1.
54: What is subsurface paste?
The sub-surface mount is a DIP (in-line) packaged light-emitting diode. Its characteristics are: slightly higher brightness, but smaller viewing angle, more complicated manufacturing process, and only manual plug-in welding, so the name is defined as sub-surface mount
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