Whether it is a customer or a practitioner, the customer needs to communicate with the salesperson for purchasing. Most of the time, the communication is very blind, because some of the parameters involved do not understand, and there are many people in the industry who often communicate with themselves. It is very unprofessional to understand. Many LED display parameters and terms are not understood. Therefore, whether it is a practitioner or a customer, it is necessary to have a general understanding of the common parameter terms of the LED display, which is conducive to the stable progress of the project. It is also conducive to communication with each other, and at the same time, it is a manifestation of being responsible for oneself to customers and projects.

Therefore, Winbond Ying Optoelectronics has sorted out the common parameter terms of LED display screens to explain it, and we will soon become professionals.

what is led

LED is the abbreviation of light-emitting diode (LIGHTEMITTINGDIODE). The LED in the LED display industry refers to the LED that can emit visible wavelengths.

What is pixel

The smallest light-emitting unit of an LED display has the same meaning as the pixel in an ordinary computer monitor.

What is dot pitch

The center distance between two adjacent pixels, the smaller the spacing, the shorter the visible distance. People in the industry usually abbreviate P to indicate the dot pitch.

What is pixel density

Also called dot matrix density, it usually refers to the number of pixels per square meter of the display screen.

What is LED module (unit board)

It is composed of several display pixels, which are independent in structure and can form the smallest unit of the LED display screen. The typical ones are 8*8, 8*7, etc. There are basic units that have a certain circuit and installation structure, have display functions, and can realize display functions through simple assembly.

What is DIP

DIP is the abbreviation of DOUBLEIN-LINEPACKAGE, dual in-line assembly.

What is SMD/STM

SMT is the surface mount technology (abbreviation of SURFACEMOUNTEDtechnology), which is currently the most popular technology and process in the electronic assembly industry; SMD is the abbreviation of surface mounted device.

What is LED display

Through a certain control method, a display screen composed of an array of LED devices.

What is in-line (plug-in light), what are the advantages and disadvantages

It means that the DIP packaged lamp passes the lamp pin through the PCB board, and fills the tin into the lamp hole by welding. The module made by this process is the plug-in lamp module. The advantages are: high brightness, good heat dissipation, but the disadvantages are The pixel density is small.

What is a surface mount module? What are the advantages and disadvantages

Surface mount is also called SMT. The SMT packaged lamp is soldered to the surface of the PCB board through a soldering process. The lamp pin does not need to pass through the PCB board. The module made by this process is called a surface mount module. The advantage is: good display effect. The pixel density is large, 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.

What is 3 in 1? What are its advantages and disadvantages

Refers to the SMT lamps encapsulated in three different colors of RGB LED chips are arranged vertically together at a certain interval, which not only has all the advantages of 3 in one, but also solves various shortcomings of three in one: complex process and difficult maintenance .

What is three in one

It is to vertically juxtapose three kinds of RGB SMT lamps with independent packages according to a certain pitch, which not only has the advantages of 3 in 1 but also solves the various shortcomings of 3 in 1.

What is dual primary color, pseudo color, full color display

Different color LEDs can form different display screens. The dual primary color is composed of red, green or yellow and green. The pseudo color is composed of three different colors of red, yellow-green and blue. The full color is composed of red. , Pure green, pure blue three different colors.

What is luminous brightness

The intensity of light emitted per unit area of the LED display is in CD/square meter, which is simply the intensity of light emitted by one square meter of display;

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.

What is gray scale

Under the same brightness level, the technical processing level of the LED display from the darkest to the brightest. The gray level has a variety of descriptions, including descriptions

What is maximum brightness

Under a certain environmental illuminance, each primary color of the LED display is at the maximum brightness and maximum gray level;

What is moiré

That is, when shooting a full-color LED display at work, some irregular water ripples will appear on the screen of the LED display. These water ripples are called "moir patterns" in physics.

What is a PCB board

PCB is (abbreviation of printedcircuitboard) printed circuit board

What is the cell board specification

Refers to the size of the cell board, usually expressed by the expression of cell board length multiplied by width, in millimeters. (48×244)

What is the resolution of the module (unit board)

It refers to the number of pixels in a unit board, usually expressed by multiplying the number of rows of pixels of the unit board by the number of columns. (For example: 64×32)

What is BOM

BOM is (abbreviation of billofmaterial) bill of materials

What is white balance and what is white balance adjustment

What we call white balance refers to the balance of white, that is, the balance of the brightness ratio of the three colors of RGB; the adjustment of the brightness ratio of the three colors of RGB and the white coordinate is called white balance adjustment;

What is contrast

Under a certain environmental illumination, the ratio of the maximum brightness of the LED display to the background brightness.

What is color temperature

When the color emitted by the light source is the same as that of the black body at a certain temperature, the temperature of the black body is called the color temperature of the light source.

What is color difference

The LED display screen is composed of red, green and blue colors to produce various colors, but these three colors are made of different materials, the viewing angle is different, and the spectral distribution of different LEDs are changed. These differences that can be observed are called For color difference. When observing the LED from a certain angle, its color changes. The human eye's ability to judge the color of a real picture (such as a movie picture) is better than observing a picture produced by a computer.

What is the frame rate

The number of times the LED display screen information is updated per unit time is to divide the screen content we see into multiple segments for playback. The frame change frequency is generally about 60, which is almost invisible to the naked eye.

What is the refresh rate

The number of times the display screen of the led display is repeatedly displayed by the display in a unit time, the higher the refresh frequency, the more delicate the picture.

What is perspective? What is the viewing angle? 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 formed by the two viewing directions of the same plane and the normal direction. Divided into horizontal and vertical viewing angles; the viewing angle is the direction in which the image content on the display can be seen, and the angle formed by the normal of the display. The best viewing angle is to be able to just see the content on the display, and not flat, the angle between the clearest direction of the image content and the normal;

What is the best viewing distance

It is the vertical distance of the clearest position of the image content relative to the screen body that can just see the content on the display screen completely, and is not flat.

What is the point of out of control? There are several

Pixels whose light-emitting state does not meet the control requirements, out-of-control points are divided into three types: blind spots (also known as dead spots) and constant bright spots (or dark spots);

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 point is called static drive, and the "point-to-column" control from the output pin of the driver IC to the pixel point is called scan drive. It needs a row control circuit: It can be clearly seen on the driver board that static driving does not require a line control circuit, which is costly, but the display effect is good, stability is good, and the brightness loss is small. Scanning driving requires a line control circuit, but the cost is low. Poor effect, high brightness loss, etc.;

What is constant current drive? What is constant voltage drive

Constant current refers to the current value specified in the constant output design within 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 the LED display

Graphic screen: Determined according to the displayed content; Video screen: Generally 4:3 or close to 4:3; The ideal ratio is 16:9.

The number of points that a control system can control

Communication screen A card: monochrome, dual color 1024×64; communication screen B card: monochrome: 896×512 dual color: 896×256; DVI dual color screen: 1280×768; DVI full color screen: 1024×512.

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 non-linear function to obtain the signal required by the display. Because of the nonlinear relationship between the front and rear signals, we often call it nonlinear correction.

What is the rated working voltage? What is the working voltage? What is the supply voltage

Rated working voltage refers to the voltage when the voltage is used for normal operation; working voltage refers to the voltage value of the electrical appliance in the rated voltage range and when working normally: the power supply voltage is divided into AC and tributary power supply voltages. Our actual AC power supply voltages are both AC220V-240V, DC power supply voltage is generally 5VDC 12V solar power supply is generally 12V

What is color distortion

It refers to the difference between the display of the same object in the natural world and the display on 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 synchronous system refers to the LED display control system that displays the content displayed on the display screen and the computer monitor synchronously; the asynchronous system refers to the storage of the display data edited by the computer in advance In the display control system, the normal display of the LED display will not be affected after the computer is shut down. 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) on the display can be detected, and a report can be formed to inform the LED screen manager. Such a technology is called blind spot detection technology;

What is power detection

Through the upper software and the underlying hardware, the working conditions of each power supply on the display can be detected, and a report can be formed to tell the LED screen manager. 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 brightness of the environment where the LED display is located. The light sensor detects the brightness of the environment where the display is currently located. This detection method is called brightness detection; the brightness in the brightness adjustment refers to the LED display The emitted brightness and the detected data are fed back to the LED display control system or control computer, and then the brightness of the display is adjusted according to this data, which is called brightness adjustment;

What are real pixels? What is a virtual pixel? What kinds of virtual pixels are there? What is pixel sharing

Real pixels refer to the 1:1 relationship between the number of physical pixels on the LED display screen and the actual displayed pixels. How many points are actually displayed on the display screen can only display image information. Virtual pixel refers to the 1:N (N=2, 4) relationship between the number of physical pixels on the display screen and the number of pixels actually displayed. It can display image pixels 2 or 4 times more than the actual pixels on the display screen; virtual Pixels can be divided into software virtual and hardware virtual according to the virtual way: according to the multiple relationship, they are divided into 2 times virtual and 4 times virtual, and according to the row of lights on a module, they are divided into: 1R1G1B virtual and 2R1G1B virtual;

What is remote control? Under what circumstances

The so-called long distance is not necessarily long distance. 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 within a relatively long space distance, customer requirements or according to customer control position beyond the optical fiber directly Control the distance, then use remote control;

What is fiber optic transmission? What is network cable transmission

Optical fiber transmission uses transparent glass fiber to convert electrical signals into optical signals, while network cable transmission uses metal wires to directly transmit electrical signals.

Under what circumstances use a network cable? When to use optical fiber

When the wiring distance between the display screen and the control computer is less than 100 meters, use network cable for transmission; when the distance between the two is less than 500 meters and greater than 100 meters, use multi-mode fiber, and when the distance is more than 500 meters, use single-mode fiber.

What is LAN control? What is internet control

In the LAN, one computer is used to control another computer or connected to other external devices. This control method is called LAN control. The main controller achieves the purpose of control through the IP address of the controller in the INTERNET network, which is called Internet control;

What is DVI? What is VGA

DVI is the abbreviation of DigitalVideointerface, that is, digital video interface. It is a digital video signal interface commonly used internationally.

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.

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

What is a PCI slot

PCI slot is an expansion slot based on PCI local bus (PEDPHERDcomponentinterconnect, peripheral component expansion interface). The PCI slot is the main expansion slot of the motherboard. Almost all the external functions that the current computer can achieve can be obtained by plugging in different expansion cards:

What is an AGP slot

Speed up the graphics interface. AGP is an interface specification that can be displayed at a faster speed on a normal personal computer using 3D graphics. AGP is an interface designed to transmit 3D graphics faster and more smoothly. He uses the main memory of an ordinary personal computer to refresh the image displayed on the monitor, and supports 3D graphics technologies such as texture mapping, zero buffering and alpha blending.

What is GPRS and what is GSM? What is CDMA

GPRS is a new carrier service developed on the existing GSM system through packet radio service (GeneralPacketRadiosrvice), mainly used for radio communication; GSM is the "GlobalSystemForMobileCommunication" standard (Global System The abbreviation for communication system), which uses digital communication technology and unified network standards to ensure communication quality and develop more new services for users to use. Code Division Addressing (CODEDIVISIONMULTIPLEACCess): 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, which can realize remote point-to-point small data transmission and achieve the purpose of remote control;

What is the USB interface

The English abbreviation of USB is UNIVERSALSERIALBUS, translated into Chinese is: Universal Serial Bus. Also known as the universal serial interface, it can support hot swap and can connect up to 127 PC peripheral devices: there are two interface standards: USB1.0 and USB2.0.

The common parameters and nouns of led display are the above. If you understand the general meaning of these parameters, I believe you will not be so blind. Although you can't directly become a professional, it at least plays a very good role in attracting ideas. Let everyone quickly understand the LED display parameter information, and communicate more smoothly, and for the project itself, there will be no mistakes.