1. What is LED?
LED is the English abbreviation of light-emitting diode (IJghtemitting diode), the display industry said “LED” refers to the LED that can emit visible light band;
2. What is a pixel?
L.the minimum luminous pixel of the display screen, which has the same meaning as the “pixel” in the ordinary computer monitor;
3. What is pixel distance (dot spacing)?
The distance from the center of one pixel to the center of another pixel;
4. What is LH) display module?
Composed of a number of display pixels, structurally independent, can form the smallest unit of the LED display. Typical “8*8″,” 8*7 “, etc., 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 SWT? What is SMD?
SurfaceMounted Technology (SMT) is the most popular technology and process in the electronic assembly industry. SMD is an abbreviation for Surface mounted device;
7. What is LED display module?
The basic unit, which is determined by the circuit and installation structure, has the display function and can realize the display function by simple assembly;
8. What is LED display?
Through a certain control mode, the display screen composed of LED device array;
9. What is a plug-in module? What are the advantages and disadvantages?
It refers to the DIP encapsulated lamp foot through the PCB board, through the solder filling in the lamp hole N, the module made by this process is the plug-in lamp module; The advantages are large viewing Angle, high brightness, good heat dissipation; The disadvantage is that the pixel density is small;
10. What is a sticker module? What are the advantages and disadvantages?
Table mount is also called SMT, the SWT encapsulated lamp is connected to the surface of the PCB board through the welding process rod, the lamp foot does not need to pass through the PCB board, the module made by this process is called the table mount module; The advantages are: good display effect, pixel density, 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 Substicker module? What are the advantages and disadvantages?
Subsurface paste is a product between DIP and SMT, its LED lamp packaging surface and SMT, but its positive and negative pins and DIP, the production is also through the PCB to weld, its advantages are: high brightness, display effect is good, the disadvantage is: complex process, difficult maintenance;
12. What is 3 in 1? What are its advantages and disadvantages?
Refers to the K, G, B three different colors of LED chip packaging in the same colloid; The advantages are: simple production, good display effect, the disadvantages are: difficult to split color, high cost;
13. What is 3 and 1? What are its advantages and disadvantages?
3 and 1 is the first innovation and use by our company in the same industry, refers to the R, G, B three independent packaging SMI lamps in accordance with a certain distance vertical side by side, so that not only has all the advantages of 3 in 1, but also can solve the shortcomings of 3 in 1;
14. What is double primary color, false color, full color display?
Through different color LED can be composed of different display, double primary color is composed of red, green or yellow green two colors, false color is composed of red, yellow green, blue three different colors, full color is composed of red, pure green, pure blue three different colors;
15. What is luminance?
LH) The light intensity emitted by the unit area of the display screen, the unit is cd/m2, simply put, is the light intensity emitted by the display screen of one square meter;
16. What is brightness level?
The number of manual or automatic adjustments between the lowest and highest brightness of the entire screen;
17. What is Grayscale?
At the same brightness level, the technical processing level of the display from the darkest to the brightest;
18. What is the maximum brightness?
Under certain ambient illumination, the LED display solves the primary color at the maximum brightness and maximum gray level;
19. What is PCB?
PCB is (Printed Circuit Board) Printed circuit board:
20. What is BOM?
A BOM is a Bill of materials (short for Bill of material).
21. What is white balance? What is white balance regulation?
What we call white balance refers to the balance of white, that is, the balance of the brightness ratio of R, G, and B three colors: the brightness ratio of R, G, and B three colors and the adjustment of white coordinates, which is called white balance adjustment;
22. What is contrast?
Under a certain ambient illumination, the ratio of the maximum brightness of the UW display to the background brightness;
23. What is color temperature?
The color of the light emitted by the light source is the same as the color of the light radiated by the blackbody at a certain temperature, and the temperature of the black body is called the color temperature of the light source.
24. What is Frame change frequency?
Number of screen information updates per unit time:
25. What is refresh frequency?
The number of times the display screen is repeated by the display screen;
26. What is perspective? What is viewable? What is the best view?
The Angle of view is the Angle between the two observation directions and the normal direction of the same plane when the brightness of the observation direction drops to 1/2 of the brightness of the normal direction of the LED display. Divided into horizontal and vertical views:
The Angle of view is just the direction of the image content on the display screen, and the Angle formed by the normal line of the display screen:
The best Angle of view is just to see the N capacity on the display screen completely, without color bias, and the Angle between the clearest direction of the image N capacity and the normal line;
27. What is the best visual distance?
It is able to see the content on the display just completely, and without color bias, and the position of the image content is the clearest relative to the vertical distance of the screen;
28. What is a runaway point? How many kinds?
Pixels whose luminous state does not conform to the control requirements; Out of control points are divided into: blind spot (also known as dead point), normal bright spot (or taste point), flash point three;
29. What is static drive? What is Scan Driver? What’s the difference between the two?
The “point-to-point” control from the output pin of the driver 1C to the pixel points is called static drive; the “point-to-column” control from the output pin of the driver IC to the pixel points is called scan drive, which requires a line control circuit; It can be clearly seen from the drive board: static drive does not need line control circuit, high cost, but good display effect, good stability, small brightness loss, etc.; It needs a line control circuit, but the cost is low, the display effect is poor, the stability is poor, and the brightness loss is large.
30. What is constant current drive? What is constant pressure drive?
Constant current refers to the current value specified at the time of constant output design in the operating environment allowed by the driver IC; Constant voltage refers to the voltage value specified at the time of constant output design in the operating 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 without correction, there will be color distortion, so in the system control circuit, the original computer output signal is calculated by a nonlinear function of the display required signal, because the nonlinear relationship between the front and back signals, so we often call it nonlinear correction;
32. What is the rated operating voltage? What is the operating voltage? What is the supply voltage?
Rated working voltage refers to the voltage when the electrical appliance is working normally; The working voltage refers to the voltage value of the electrical appliance in the rated voltage range and normal operation: the power supply voltage is AC and DC power supply voltage, our display AC power supply voltage is AC220V~240V, DC power supply voltage is SV;
33. What is color distortion?
It refers to the same object displayed in nature and on the display screen, and the difference between the sensory vision of the human eye;
34: What is a synchronous system and what is an asynchronous system?
M step and asynchronous is relative to the computer, the so-called step system, refers to the display display content and computer display synchronous display LED display control system; Asynchronous system refers to the computer edited display data stored in advance in the display control system, the computer will not affect the normal display of the LED display after shutdown, such a control system is asynchronous system;
35. What is blind spot detection technology?
Through the upper computer software and the underlying hardware, the blind spot (LED open circuit and short circuit) on the display can be detected, and a report is formed to tell the LED screen body manager, such a technology is called blind spot detection technology;
36. What is power inspection?
Through the upper computer software and the underlying hardware, the work of each power supply on the display can be detected, and a report can be formed to tell the WD screen manager, such a technology is called power detection technology:
37. What is brightness detection? What is brightness adjustment?
The brightness in the brightness detection refers to the ambient brightness of the LED display. Through the light sensor, the ambient brightness of the display screen is currently detected. This detection method is called brightness detection; The brightness adjustment refers to the brightness emitted by the LED display, the detected data is fed back to the LBD display control system or the control computer, and then adjust the brightness of the display according to this data, which is called brightness adjustment;
38. What are real pixels? What is a virtual pixel? How many virtual pixels are there? What is pixel sharing?
Real pixel refers to the physical pixel number on the display and the actual display pixel number is 1:1 relationship, the actual number of points on the display screen, can only display not many points of image information; Virtual pixel refers to the system where the physical pixel number on the display and the actual pixel number on the display are 1: N (N=2, 4), and the image pixel that can be displayed is 2 times or 4 times more than the actual pixel of the display. According to the virtual control mode, virtual pixels can be divided into software virtual and hardware virtual; According to the multiple laugh system, it is divided into: 2x virtual and 4x virtual, according to the arrangement of lights on a module, it is divided into: IRIGIB virtual and 2RIGIB virtual;
39. What is process control? Under what circumstances is it used?
Distance is not necessarily distance. The extended range control includes the main control end and the controlled end in a local area network, and the space distance is not far away; And the main control end and the controlled end in a relatively far space distance two; Customer requirements or according to the customer control position beyond the direct control of the optical fiber distance, then use the process control;
40. What is fiber optic transmission? What is network cable transmission?
Optical fiber transmission is the conversion of electrical signals into optical signals using transparent glass fiber transmission; Network cable transmission is the use of metal wire direct electrical signal transmission;
41. When do I use cable? When to use fiber optics?
When the distance between the display screen and the control computer is less than 100M, use network cable transmission; When the distance between the two is less than 500M and greater than 100M, use a multi-mode fiber; when the distance is greater than 500M, use a single-mode fiber;
42. What is LAN control? What is Internet Control?
In the LAN through a computer to control another computer or connected to its external devices, this control mode is called LAN control; The main controller accesses the IP address of the controller in the Intemer network to achieve the purpose of control, which is called Internet control.
43. What is DVI? What is VGA?
DVI is the abbreviation of DigitalVideoInterface, that is, digital video interface. It is now an international common digital video signal interface; The full English name of VGA is Video Graphic Array, that is, display graphics array. It is R, G, B three kinds of analog output video signal interface;
44. What is a digital signal? What is a digital circuit?
Digital signal means that the value of signal amplitude is discrete, and the amplitude is limited to two finite values of 0 and I; The circuits that process and control such signals are called digital circuits;
45. What is analog signal? What is an analog circuit?
Analog signal means that the value of signal amplitude is continuous in time; The circuits that process and control such signals are called analog circuits;
46. What is a PCI slot?
PCT slot is an expansion slot based on PCT local bus (Pedpherd Component Interconnect, peripheral component expansion interface). PCI slot is the main expansion slot of the motherboard, and almost all external functions can be achieved by the R front computer through plugging different expansion cards.
47. What is an AGP slot?
Accelerated Graphics Interface.AGP is an interface UI specification that enables 3D graphics to be displayed faster 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 images displayed on the monitor, and supports 3D graphics technologies such as texture mapping, zero buffering, and alpha blending.
48. What is GPRS? What is GSM? What is CDMA?
GPRS is the general packet radio service (GeneralPacketRadioService), is on the existing GSM system developed a kind of new bearing business, mainly used in radio communication; GSM is the abbreviation of “GlobalSystemForMobi 1 eCommunication” standard (GlobalSystem for Mobile Communication) launched by the European Standardization Committee in 1992. It adopts digital communication technology and unified network standards to ensure the quality of communication. And can develop more new services for users to use. 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 is communicated through the GPRS transceiver module, which can achieve a small amount of remote and remote point-to-point data transmission! Achieve the purpose of remote control;
50. What is USB interface?
USB abbreviation is UniversalSerialBus, translated into Chinese is “universal serial bus”, also known as universal series interface, it can support hot swap, can connect up to 127 PC external devices; There are USBI.0 and USB2.0 two kinds of 1_1 standard;
