What is the best line of sight?
Is the content that can be seen completely on the display, and is not flat, the clearest position of the image content relative to the vertical distance of the screen.
What is the point of loss? How many?
The pixel points whose illumination state does not match the control requirements are divided into three types: blind point (also known as a dead point) and constant bright point (or dark point).
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 control of “point-to-column” from the output pin of the driver IC to the pixel is called scan drive. He needs the line control circuit: The driver board can be clearly seen: the static driver does not need the row control circuit, the cost is high, but the display effect is good, the stability is good, the brightness loss is small, etc.; the scan driver needs the line control circuit, but the cost is low, the display Poor effect, brightness loss, etc.
What is a 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.
What is the general aspect ratio of LED display?
Graphic screen: determined according to the displayed content; video screen: generally 4:3 or close to 4:3; ideal ratio is 16:9.
What is the number of points that a control system can control?
Communication screen A card: monochrome, two-color 1024×64; communication screen B card: monochrome: 896×512 two-color: 896×256; DVI two-color screen: 1280×768; DVI full-color screen: 1024×512.
What is a nonlinear correction?
If the digital signal output from the computer is not corrected, the color distortion will appear on the LED display. Therefore, in the system control circuit, the signal output by the original computer is calculated by a nonlinear function. Because the front and back signals are nonlinear, we often call it a nonlinear correction.
What is the rated working voltage? What is the working 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 electrical appliance in the rated voltage range and normal working: the power supply voltage is divided into the AC and the branch supply voltage and our actual AC supply voltage is AC220V—240V, DC power supply voltage is generally 5V DC12V Solar power supply is generally 12V.
What is color distortion?
It means that the same object is displayed in nature and on the display, and the difference between the two is the sensory vision of the human eye.
What is a synchronous system and what is an asynchronous system?
Synchronous and asynchronous are relative to the computer. The so-called synchronization system refers to the LED display control system that displays the content displayed on the display and the computer display. The asynchronous system means that the computer-edited display data 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 control system.
What is blind spot detection technology?
Through the upper software and the underlying hardware, the blind spots (LED open and short circuit) on the display screen can be detected, and a report is generated to tell the LED screen manager that such a technology is called blind spot detection technology.
What is power detection?
Through the upper software and the underlying hardware, the working status of each power supply on the display can be detected, and a report is generated to tell the LED screen manager that such a technology is called power detection technology.
What is brightness detection? What is brightness adjustment?
The brightness in the brightness detection refers to the ambient brightness of the LED display screen. Through the light sensor, the ambient brightness of the display screen is detected. This detection method is called brightness detection; the brightness mentioned in the brightness adjustment refers to the LED display. The brightness emitted, the detected data is fed back to the LED display control system or the control computer, and then the brightness of the display screen is adjusted according to the data, called brightness adjustment.
What is the real pixel? What is a virtual pixel? What kinds of virtual pixels are there? What is pixel sharing?
Answer 45) The real pixel refers to the relationship between the physical pixel number on the display screen and the actual displayed pixel point is 1:1. How many points actually appear on the display screen can only display the image information of how many points. The virtual pixel refers to the relationship between the physical pixel number of the display screen and the actual displayed pixel number: 1: N (N=2, 4), which can display the image pixel 2 times or 4 times more than the actual pixel of the display screen; Pixels can be divided into virtual and hardware virtual according to the virtual way: divided into 2 times virtual and 4 times virtual according to the multiple relationship, according to the lighting mode on one module: 1R1G1B virtual and 2R1G1B virtual.
What is a 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 controlling terminal in a local area network, and the space distance is not far, and the main control terminal and the controlling terminal are within a relatively distant spatial distance, and the customer requests or directly exceeds the optical fiber according to the customer control position. Control the distance, then use remote control.
What is fiber transmission? What is network cable transmission?
Optical fiber transmission is the conversion of electrical signals into optical signals by transparent glass fiber transmission. The transmission of the network cable is the direct transmission of electrical signals by means of metal wires.
Under what circumstances do you use a network cable? When do you use fiber?
When the wiring distance between the display screen and the control computer is less than 100 meters, it is transmitted by the network cable; when the distance between the two is less than 500 meters and more than 100 meters, the multimode fiber is used, and when the distance is more than 500 meters, the single mode fiber is used.
What is LAN control? What is internet control?
In the LAN, another computer is controlled by another computer or connected to other external devices. This control method is called LAN control. The main controller is controlled by the IP address of the controller in the INTERNET network, called the Internet. control.
What is DVI? What is VGA?
DVI(Digital Video Interface) is a digital video interface. It is a digital video signal interface that is now internationally accepted.
What is a digital signal? What is a digital circuit?
The 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 for processing and controlling the west signal is called a digital circuit.
What is the analog signal and what is the analog circuit?
The analog signal means that the value of the signal amplitude is continuous over time; the circuit that processes and controls such a signal is called an analog circuit.
What is a PCI slot?
The PCI slot is an expansion slot based on the PCI local bus (PEDPHERD Component Interconnect). The PCI slot is the main expansion slot of the motherboard. By plugging in different expansion cards, you can get almost all the external functions that the computer can achieve.
What is the AGP slot?
Accelerate the graphics interface. AGP is an interface specification that can be displayed at a faster speed on a normal PC using 3D graphics. AGP is an interface designed to transfer 3D graphics faster and more smoothly. He uses the main memory of a normal PC to refresh the image displayed on the display and supports 3D graphics technology such as texture mapping, zero buffering and alpha blending.
What is GPRS and what is GSM? What is CDMA?
GPRS is a new bearer service developed on the existing GSM system through packet radio service（General Packet Radiosrvice）, mainly used for radio communication; GSM is the “Global System For Mobile Communication” standard uniformly introduced by the European Committee for Standardization in 1992. The use of digital communication technology, unified network standards, to ensure the quality of communication, and the development of more new services to provide users. Code division address（CODE DIVISION MULTIPLE ACCess）: A new and mature wireless communication technology based on spread spectrum technology.
Where is the use of GPRS technology for the display?
On the GPRS data network based on mobile communication, the data of our LED display screen is communicated through the GPRS transceiver module for data communication, which can realize point-to-point small-scale data transmission remotely and remotely, achieving the purpose of remote control.
What is a USB interface?
The English abbreviation for USB is UNIVERSAL SERIAL BUS, which translates into Chinese: Universal Serial Bus. Also known as the universal serial interface, it can support hot swapping and can connect up to 127 PC external devices: USB1.0 and USB2.0 interface standards.