1, what is LED
LED is a light emitting diode (LIGHT EMITTING DIODE), the LED in the display industry specifically refers to a LED that emits a visible band
2, what is a pixel
The smallest luminous unit of the LED display has the same meaning as the pixel in the ordinary computer monitor.
3, what is the pixel pitch (point spacing)
The distance between the centers of two adjacent pixels;
4, what is the LED display module consists of a number of display pixels, the structure is independent, can form the smallest unit of LED display. Typical 8*8, 8*7, etc.
5, what is DIP
DIP is the abbreviation of DOUBLE IN-LINE PACKAGE,Dual Inline Assembly
6. What is SMT? What is SMD?
SMT is surface mount technology (abbreviation of SURFACE MOUNTED technology) and is the most popular technology and process in the electronics assembly industry.
SMD is a surface mount device (abbreviation for surface mounted device)
7. What is the basic unit of the LED display module that has the circuit and installation structure determined, has the display function, and can realize the display function through simple assembly
8, what is the LED display through a certain control method, composed of LED device array display screen;
9. What are the advantages and disadvantages of the plug-in lamp module?
It refers to the DIP packaged lamp passing the lamp foot through the PCB board and filling the lamp hole with solder. The module made by this process is the plug-in lamp module. The advantages are: 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?
The surface mount is also called SMT. The SMT packaged lamp is soldered to the surface of the PCB board through the soldering process. The lamp leg does not need to pass through the PCB board. The module made of this process is called the surface mount module. The advantage is that the display effect is good. Pixel density, suitable for indoor viewing: The disadvantage is that the brightness is not high enough, the lamp itself is not good enough for heat dissipation.
11. What is a sub-adhesive module? What are the advantages and disadvantages?
Sub-SMT is a product between DIP and SMT. Its LED lamp has the same packaging surface as SMT, but its positive and negative pins are the same as those of DIP. It is soldered through the PCB during production. The advantages are: high brightness and good display effect. The disadvantages are: complicated process and difficult maintenance;
12. What is 3 in one? What are its advantages and disadvantages?
It means that the SMT lamps encapsulated by three different colors of LED chips of different colors are vertically aligned along a certain distance. This not only has all the advantages of 3-in-1, but also can solve various shortcomings of 3-in-1: the process is complicated and maintenance is difficult. .
13, what is the three and the first is to RGB three independent packaged SMT lamps in parallel with a certain distance, this will not only have the advantages of 3 in one, but also solve the three-in-one shortcomings:
14. What is a dual-Color, pseudo-color, full-color display screen can be composed of different display screens with different colors of light-emitting diodes, dual-color is composed of red, green or yellow-green colors, pseudo-color is from red, yellow and green , blue three different colors, full color is composed of red, pure green, pure blue three different colors.
15: What is the brightness of light
The light intensity emitted by a LED display unit area is expressed in units of CD/square meter, which is simply the intensity of light emitted by a square meter display;
16: What is the brightness level? The number of manually or automatically adjusted levels from full-brightness to full-brightness.
17, what is the gray level in the same brightness level, the display from the darkest to the brightest between the number of technical processing
18, what is the maximum brightness in a certain degree of ambient illumination, the LED display screen in each primary color at the maximum brightness and maximum gray scale;
19, what is PCB
PCB is (printed circuit board abbreviation) printed circuit board
20 what is BOM
BOM is (bill of material) BOM
21: What is white balance, what is the white balance to adjust what we call the white balance, refers to the white balance, that is, the balance of the brightness ratio of the three colors of RGB; the brightness ratio of the three colors of RGB and the adjustment of the white coordinates, said Adjust for white balance;
22: What is the ratio of the maximum brightness of the LED display to the background brightness under a certain ambient illumination?
23, what is the color temperature of light emitted by the light source and the black body at a certain temperature when the radiation is the same color, the temperature of the black body is called the color temperature of the light source.
24 What is the number of update times of the display screen information per unit time of frame change frequency;
25. What is the number of times the refresh frequency display screen is repeatedly displayed on the display screen in unit time;
26: What is the perspective? What is the perspective? What is the best perspective?
The viewing angle is when the brightness of the viewing direction drops to 1/2 of the brightness of the normal line of the LED display. The angle between the two observation directions and the normal direction of the same plane. Divided into horizontal and vertical perspectives;
The view angle is the angle that just looks at the image content on the display screen and the normal to the display screen.
The best viewing angle is the angle between the normal direction of the image content and the normal line.
27: What is the best line of sight?
It is the vertical distance from the screen body that can exactly see the contents of the display screen, and is not flat and the most clear image content is relative to the screen body:
28: What is the out-of-control point? Several kinds!
Pixels that do not correspond to the lighting state and control requirements are divided into three categories: blind spot (also known as dead point), and constantly bright spot (or dark spot) flash point;
29. What is 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 driving. The "point-to-column" control from the output pin of the driver IC to the pixel is called scan drive. He needs to control the circuit from: The driver board can be clearly seen: static drive does not need to control the circuit, the cost of teaching, but the display is good, good stability, brightness loss, teaching, etc.; scan drive it requires line control circuit, but the cost is low, display Poor results, loss of brightness, etc.;
30. What is constant current drive? What is a constant voltage drive?
Constant current refers to the constant current output value specified in the allowable working environment of the driver IC: Constant voltage refers to the voltage value specified in the constant output design within the allowable operating environment of the driver IC.
31. What is a nonlinear correction?
If the digital signal output from the computer is displayed without correction on the LED display, color distortion may occur. Therefore, in the system control circuit, the signals output from the computer output signal are calculated through a nonlinear function. Because the front and back signals are nonlinear, we often call it a nonlinear correction.
32. What is the rated operating voltage? What is the operating voltage? What is the supply voltage?
The rated working voltage refers to the voltage when the voltage is working normally; the working voltage refers to the voltage value of the electric appliance within the rated voltage range during normal operation: the supply voltage is divided into AC and tributary supply voltages, and our actual AC supply voltage is both AC220V---240V, DC supply voltage is generally 5V DC12V Solar power supply is generally 12V
33. What is color distortion? It means that the same object is displayed in nature and on the display, both of which have differences in the visual sense of the human eye.
34: What is a synchronous system and what is an asynchronous system?
Synchronous and asynchronous are relative to what the computer says. The so-called synchronous system refers to the LED display control system that displays the content displayed on the display screen in synchronization with the computer monitor. The asynchronous system means that the computer-displayed display data is stored in advance. In the display control system, the shutdown of the computer will not affect the normal display of the LED display. Such a control system is an asynchronous control system.
35 What is the blind spot detection technology? Through the upper software and the underlying hardware, it can detect the blind spot (LED open circuit and short circuit) on the display, and form a report to tell the LED screen administrator, such a technology is called blind spot detection technology;
36, what is the power detection through the upper software and the underlying hardware, can monitor 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
37. What is brightness detection? What is brightness adjustment?
Brightness in brightness detection refers to the brightness of the environment in which the LED display screen is located. Through the light sensor, the ambient brightness of the display screen is detected. This detection method is called brightness detection; the brightness in the brightness adjustment refers to the LED display screen. The brightness sent out, the detected data feedback to the LED display control system or control computer, and then adjust the brightness of the display according to this data, called brightness adjustment;
38 What is a real pixel? What is a virtual pixel? What are the virtual pixels? What is pixel sharing?
The real pixel refers to the relationship between the number of physical pixels on the display screen and the actually displayed pixels. The actual number of points on the display screen can only show how many points of image information.
The virtual pixel refers to the relationship between the number of physical pixels of the display screen and 1:N (N=2, 4) of the actually displayed pixel points. It can display the image pixels by 2 or 4 times the actual pixels of the display screen.
The virtual pixels can be divided into virtual modes according to virtual modes: software virtual and hardware virtual: divided into 2 times virtual and 4 times virtual according to the multiple relationship, and divided into 1R1G1B virtual and 2R1G1B virtual according to the row of lights on a module;
39. What is remote control? Under what circumstances?
The so-called remote is not necessarily a long distance. The remote control includes the main control end and the controlled end in a local area network, but the space distance is not far; and the main control end and the controlled end are in two kinds of distances within a relatively long distance. The customer request or according to the customer control position exceeds the optical fiber directly Control distance, then use remote control;
40 What is fiber optic transmission? What is a cable transmission?
Optical fiber transmission is the use of transparent glass fiber for the transmission of electrical signals to optical signals. Transmission of electrical lines is the use of metal wires for direct electrical signal transmission.
41. Under what circumstances is the network cable used? Under what circumstances with fiber?
When the distance between the display screen and the control computer is less than 100 meters, the cable is used for transmission. When the distance between the two is less than 500 meters and greater than 100 meters, the multimode optical fiber is used. When the distance is more than 500 meters, the single-mode optical fiber is used.
42, what is LAN control? What is Internet Control?
In a local area network, a computer controls another computer or connects to other external devices. This control method is called local area network control. The main controller achieves the purpose of control through the IP address of the controller in the Internet network. It is called the Internet. control;
43, What is DVI? What is VGA?
DVI is the abbreviation of Digital Video interface, namely digital video interface. It is now a universal digital video signal interface.
44, what is a digital signal? What is a digital circuit?
The digital signal means that the amplitude of the signal is discrete, the amplitude is limited to two finite values ​​of 0 and 1, and the circuit for processing and controlling the west signal is called a digital circuit.
45. What is an analog signal and what is an analog circuit?
Analog signal means that the value of signal amplitude is continuous in time; the circuit that processes and controls this signal is called analog circuit.
46, what is the PCI slot
The PCI slot is an expansion slot based on a PCI local bus (PEDPHERD component interconnect).
The PCI slot is the main expansion slot of the motherboard. By plugging in different expansion cards, almost all external functions that the computer can achieve can be achieved:
47, what is the AGP slot accelerated graphics interface. AGP is an interface specification that can be displayed at a faster speed on ordinary personal computers using 3D graphics. AGP is an interface designed to transfer 3D graphics faster and more smoothly. He uses the main memory of an ordinary personal computer 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 a new bearer service developed in the existing GSM system through packet radio service (General Packet Radio Service), mainly used for radio communications;
GSM is the abbreviation of "Global System For Mobile Communication" standard (Global System for Mobile Communication), which was uniformly introduced by the European Committee for Standardization in 1992.
It uses digital communication technology and a unified network standard to ensure the quality of communications and to develop more new services for users.
Code Division Addressing (CO DE DIVISION MULTIPLE ACCess): A new and mature wireless communication technology based on spread spectrum technology.
49, GPRS technology for the usefulness of the display there?
In the GPRS data network based on mobile communication, the data of our LED display screen is used for data communication through the GPRS transceiver module, which can realize point-to-point small-scale data transmission remotely and remotely, achieving the purpose of remote control;
50 what is the USB interface
The English acronym for USB is UNIVERSAL SERIALBUS, translated into Chinese: Universal Serial Bus. Also known as Universal Serial Interface, it supports hot-plugging and can connect up to 127 PC external devices: USB 1.0 and USB 2.0 interface standards
LED is a light emitting diode (LIGHT EMITTING DIODE), the LED in the display industry specifically refers to a LED that emits a visible band
2, what is a pixel
The smallest luminous unit of the LED display has the same meaning as the pixel in the ordinary computer monitor.
3, what is the pixel pitch (point spacing)
The distance between the centers of two adjacent pixels;
4, what is the LED display module consists of a number of display pixels, the structure is independent, can form the smallest unit of LED display. Typical 8*8, 8*7, etc.
5, what is DIP
DIP is the abbreviation of DOUBLE IN-LINE PACKAGE,Dual Inline Assembly
6. What is SMT? What is SMD?
SMT is surface mount technology (abbreviation of SURFACE MOUNTED technology) and is the most popular technology and process in the electronics assembly industry.
SMD is a surface mount device (abbreviation for surface mounted device)
7. What is the basic unit of the LED display module that has the circuit and installation structure determined, has the display function, and can realize the display function through simple assembly
8, what is the LED display through a certain control method, composed of LED device array display screen;
9. What are the advantages and disadvantages of the plug-in lamp module?
It refers to the DIP packaged lamp passing the lamp foot through the PCB board and filling the lamp hole with solder. The module made by this process is the plug-in lamp module. The advantages are: 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?
The surface mount is also called SMT. The SMT packaged lamp is soldered to the surface of the PCB board through the soldering process. The lamp leg does not need to pass through the PCB board. The module made of this process is called the surface mount module. The advantage is that the display effect is good. Pixel density, suitable for indoor viewing: The disadvantage is that the brightness is not high enough, the lamp itself is not good enough for heat dissipation.
11. What is a sub-adhesive module? What are the advantages and disadvantages?
Sub-SMT is a product between DIP and SMT. Its LED lamp has the same packaging surface as SMT, but its positive and negative pins are the same as those of DIP. It is soldered through the PCB during production. The advantages are: high brightness and good display effect. The disadvantages are: complicated process and difficult maintenance;
12. What is 3 in one? What are its advantages and disadvantages?
It means that the SMT lamps encapsulated by three different colors of LED chips of different colors are vertically aligned along a certain distance. This not only has all the advantages of 3-in-1, but also can solve various shortcomings of 3-in-1: the process is complicated and maintenance is difficult. .
13, what is the three and the first is to RGB three independent packaged SMT lamps in parallel with a certain distance, this will not only have the advantages of 3 in one, but also solve the three-in-one shortcomings:
14. What is a dual-Color, pseudo-color, full-color display screen can be composed of different display screens with different colors of light-emitting diodes, dual-color is composed of red, green or yellow-green colors, pseudo-color is from red, yellow and green , blue three different colors, full color is composed of red, pure green, pure blue three different colors.
15: What is the brightness of light
The light intensity emitted by a LED display unit area is expressed in units of CD/square meter, which is simply the intensity of light emitted by a square meter display;
16: What is the brightness level? The number of manually or automatically adjusted levels from full-brightness to full-brightness.
17, what is the gray level in the same brightness level, the display from the darkest to the brightest between the number of technical processing
18, what is the maximum brightness in a certain degree of ambient illumination, the LED display screen in each primary color at the maximum brightness and maximum gray scale;
19, what is PCB
PCB is (printed circuit board abbreviation) printed circuit board
20 what is BOM
BOM is (bill of material) BOM
21: What is white balance, what is the white balance to adjust what we call the white balance, refers to the white balance, that is, the balance of the brightness ratio of the three colors of RGB; the brightness ratio of the three colors of RGB and the adjustment of the white coordinates, said Adjust for white balance;
22: What is the ratio of the maximum brightness of the LED display to the background brightness under a certain ambient illumination?
23, what is the color temperature of light emitted by the light source and the black body at a certain temperature when the radiation is the same color, the temperature of the black body is called the color temperature of the light source.
24 What is the number of update times of the display screen information per unit time of frame change frequency;
25. What is the number of times the refresh frequency display screen is repeatedly displayed on the display screen in unit time;
26: What is the perspective? What is the perspective? What is the best perspective?
The viewing angle is when the brightness of the viewing direction drops to 1/2 of the brightness of the normal line of the LED display. The angle between the two observation directions and the normal direction of the same plane. Divided into horizontal and vertical perspectives;
The view angle is the angle that just looks at the image content on the display screen and the normal to the display screen.
The best viewing angle is the angle between the normal direction of the image content and the normal line.
27: What is the best line of sight?
It is the vertical distance from the screen body that can exactly see the contents of the display screen, and is not flat and the most clear image content is relative to the screen body:
28: What is the out-of-control point? Several kinds!
Pixels that do not correspond to the lighting state and control requirements are divided into three categories: blind spot (also known as dead point), and constantly bright spot (or dark spot) flash point;
29. What is 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 driving. The "point-to-column" control from the output pin of the driver IC to the pixel is called scan drive. He needs to control the circuit from: The driver board can be clearly seen: static drive does not need to control the circuit, the cost of teaching, but the display is good, good stability, brightness loss, teaching, etc.; scan drive it requires line control circuit, but the cost is low, display Poor results, loss of brightness, etc.;
30. What is constant current drive? What is a constant voltage drive?
Constant current refers to the constant current output value specified in the allowable working environment of the driver IC: Constant voltage refers to the voltage value specified in the constant output design within the allowable operating environment of the driver IC.
31. What is a nonlinear correction?
If the digital signal output from the computer is displayed without correction on the LED display, color distortion may occur. Therefore, in the system control circuit, the signals output from the computer output signal are calculated through a nonlinear function. Because the front and back signals are nonlinear, we often call it a nonlinear correction.
32. What is the rated operating voltage? What is the operating voltage? What is the supply voltage?
The rated working voltage refers to the voltage when the voltage is working normally; the working voltage refers to the voltage value of the electric appliance within the rated voltage range during normal operation: the supply voltage is divided into AC and tributary supply voltages, and our actual AC supply voltage is both AC220V---240V, DC supply voltage is generally 5V DC12V Solar power supply is generally 12V
33. What is color distortion? It means that the same object is displayed in nature and on the display, both of which have differences in the visual sense of the human eye.
34: What is a synchronous system and what is an asynchronous system?
Synchronous and asynchronous are relative to what the computer says. The so-called synchronous system refers to the LED display control system that displays the content displayed on the display screen in synchronization with the computer monitor. The asynchronous system means that the computer-displayed display data is stored in advance. In the display control system, the shutdown of the computer will not affect the normal display of the LED display. Such a control system is an asynchronous control system.
35 What is the blind spot detection technology? Through the upper software and the underlying hardware, it can detect the blind spot (LED open circuit and short circuit) on the display, and form a report to tell the LED screen administrator, such a technology is called blind spot detection technology;
36, what is the power detection through the upper software and the underlying hardware, can monitor 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
37. What is brightness detection? What is brightness adjustment?
Brightness in brightness detection refers to the brightness of the environment in which the LED display screen is located. Through the light sensor, the ambient brightness of the display screen is detected. This detection method is called brightness detection; the brightness in the brightness adjustment refers to the LED display screen. The brightness sent out, the detected data feedback to the LED display control system or control computer, and then adjust the brightness of the display according to this data, called brightness adjustment;
38 What is a real pixel? What is a virtual pixel? What are the virtual pixels? What is pixel sharing?
The real pixel refers to the relationship between the number of physical pixels on the display screen and the actually displayed pixels. The actual number of points on the display screen can only show how many points of image information.
The virtual pixel refers to the relationship between the number of physical pixels of the display screen and 1:N (N=2, 4) of the actually displayed pixel points. It can display the image pixels by 2 or 4 times the actual pixels of the display screen.
The virtual pixels can be divided into virtual modes according to virtual modes: software virtual and hardware virtual: divided into 2 times virtual and 4 times virtual according to the multiple relationship, and divided into 1R1G1B virtual and 2R1G1B virtual according to the row of lights on a module;
39. What is remote control? Under what circumstances?
The so-called remote is not necessarily a long distance. The remote control includes the main control end and the controlled end in a local area network, but the space distance is not far; and the main control end and the controlled end are in two kinds of distances within a relatively long distance. The customer request or according to the customer control position exceeds the optical fiber directly Control distance, then use remote control;
40 What is fiber optic transmission? What is a cable transmission?
Optical fiber transmission is the use of transparent glass fiber for the transmission of electrical signals to optical signals. Transmission of electrical lines is the use of metal wires for direct electrical signal transmission.
41. Under what circumstances is the network cable used? Under what circumstances with fiber?
When the distance between the display screen and the control computer is less than 100 meters, the cable is used for transmission. When the distance between the two is less than 500 meters and greater than 100 meters, the multimode optical fiber is used. When the distance is more than 500 meters, the single-mode optical fiber is used.
42, what is LAN control? What is Internet Control?
In a local area network, a computer controls another computer or connects to other external devices. This control method is called local area network control. The main controller achieves the purpose of control through the IP address of the controller in the Internet network. It is called the Internet. control;
43, What is DVI? What is VGA?
DVI is the abbreviation of Digital Video interface, namely digital video interface. It is now a universal digital video signal interface.
44, what is a digital signal? What is a digital circuit?
The digital signal means that the amplitude of the signal is discrete, the amplitude is limited to two finite values ​​of 0 and 1, and the circuit for processing and controlling the west signal is called a digital circuit.
45. What is an analog signal and what is an analog circuit?
Analog signal means that the value of signal amplitude is continuous in time; the circuit that processes and controls this signal is called analog circuit.
46, what is the PCI slot
The PCI slot is an expansion slot based on a PCI local bus (PEDPHERD component interconnect).
The PCI slot is the main expansion slot of the motherboard. By plugging in different expansion cards, almost all external functions that the computer can achieve can be achieved:
47, what is the AGP slot accelerated graphics interface. AGP is an interface specification that can be displayed at a faster speed on ordinary personal computers using 3D graphics. AGP is an interface designed to transfer 3D graphics faster and more smoothly. He uses the main memory of an ordinary personal computer 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 a new bearer service developed in the existing GSM system through packet radio service (General Packet Radio Service), mainly used for radio communications;
GSM is the abbreviation of "Global System For Mobile Communication" standard (Global System for Mobile Communication), which was uniformly introduced by the European Committee for Standardization in 1992.
It uses digital communication technology and a unified network standard to ensure the quality of communications and to develop more new services for users.
Code Division Addressing (CO DE DIVISION MULTIPLE ACCess): A new and mature wireless communication technology based on spread spectrum technology.
49, GPRS technology for the usefulness of the display there?
In the GPRS data network based on mobile communication, the data of our LED display screen is used for data communication through the GPRS transceiver module, which can realize point-to-point small-scale data transmission remotely and remotely, achieving the purpose of remote control;
50 what is the USB interface
The English acronym for USB is UNIVERSAL SERIALBUS, translated into Chinese: Universal Serial Bus. Also known as Universal Serial Interface, it supports hot-plugging and can connect up to 127 PC external devices: USB 1.0 and USB 2.0 interface standards
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