Views: 0 Author: Site Editor Publish Time: 2021-07-14 Origin: Site
This article mainly introduces the basic knowledges of led display screens, hoping to let you know more about the display screen.
What is a led display?
LED display is a new type of imaging electronic device made of light-emitting diodes arranged in sequence. Because of its high brightness, wide viewing angle, long life and other characteristics,it is widely used in outdoor advertising screens and other products.
LED display is generally used to display various information such as text, image, video, video signal, etc. It can not only integrate information release, arts and entertainment, promotion function, but also as a new high-tech goods, with its rich scientific and technological content, surging appearance of the momentum, the smooth appearance of the screen, delicate color embodiment, can add a new vitality to the environment, set up a landscape of activities, and now has become the head of the choice of corporate publicity.
What is the working principle of LED display?
Take LED (Light Emitting Diode) as the basic light-emitting element (pixel), control the brightness and extinction of each pixel or its brightness and darkness by controlling circuit and driving circuit, so that the display with a considerable number of pixels can display various information required by people.
What are the performance characteristics of LED display?
(1) High intensity luminescence, under the refraction of sunlight, the content of the screen surface can be presented in high definition in the visual range.
(2) High grayscale control level. Can use 1024 ~ 4096 levels of grayscale to control and clearly and realistically display more than 16.7M colors, to ensure that the picture of the superb three-dimensional sense.
(3) High drive power. The scanning mode is mainly static latching to ensure high intensity bright light.
(4) To ensure the best playback effect, the light brightness can be controlled reasonably by the automatic adjustment function in different background environments.
(5) With the help of large-scale imported integrated circuit devices, the reliability of operation is enhanced and maintenance and commissioning work is facilitated.
(6) Using modern digital processing technology to deal with video, choosing technology distribution of the scan, designing presents modularity, using static constant current drive, automatic adjust light, so that achieve high fidelity of the picture, no ghosting front, and enhance the clarity of the image screen.
(7)The information display is rich in variety, such as icons, videos, text, animations, pictures, etc., and there are various forms of reality, such as networking, remote reality, the combination of common colors and processes, etc.
What are the application areas of LED display?
LED display industry is developing rapidly, many people's demand for the display is also increasing, the following is to talk about what are the applications of LED display.
1.Road traffic information guidance.
Intelligent traffic information guidance screen is now rapidly emerging, mainly in urban traffic, highways and many other areas. LED traffic information guidance screen, variable information board speed limit signs, in a short period of time, has been rapidly and universally adopted, and has become an important carrier of intelligent transportation and even intelligent cities.
As we know, LED display can play the role of commodity promotion. In addition to the outdoor advertising screens we often see, along with the creation of window screens, more and more businesses are beginning to buy indoor advertising screens as a way to achieve the purpose of attracting customers.
Nowadays, LED display as the main means of game information display and live broadcast of the game, has been used in major stadiums for a long time, becoming the necessary game facilities in modern stadiums. For example, bucket screen, fence screen, which can play the game in real time, Fans no longer have to worry about the problem of being too far away to see the scene. It is also an important way for businesses to place advertisements.
Indoor and outdoor stage performances, concerts, large-scale activities, large opera houses, theaters, hotels, auditoriums, lecture halls, high-end entertainment venues, discos, nightclubs, karaoke rooms, etc. ,which are closely related to the stage LED display and inseparable.
5.Broadcast, media, exhibitions.
LED display large screen as one of the important services provided by the company's corporate exhibition organizers, provides their own home brand culture as well as the use of products to the majority of users. In addition, LED displays now also play an important role in radio and television studios and security monitoring rooms.
The use of LED displays is becoming more and more widespread, and as the small pitch technology becomes more and more mature, LED displays are also widely used in conference rooms, command and control centers, and even home theaters and other occasions. It has become a new display media that people fully use their imagination and technology to enhance the performance of the product. The original is the icing on the cake of the LED display, if it can give full play to its intelligent advantages, then the future application may have a different kind of heaven.
What is LED?
LED is the abbreviation of light-emitting diode, The LED that display industry LED refers can emit visible wavelengths.
What is a pixel?
Pixel is the smallest light-emitting unit of LED display, the same as the meaning of pixel in ordinary computer monitor.
What is the pixel pitch?
The center distance between two adjacent pixels. The smaller the distance, the shorter the visible distance. People in the industry usually abbreviate P to indicate the pixel pitch.
What is pixel density?
Also known as dot density, it usually refers to the number of pixels per square meter of display.
What is DIP, SMT(SMD)?
The led display can be divided into DIP led display and SMD led display according to the led lamp type. SMD led display is also called 3-in-1 type led display, and DIP led display is also called standalone led display.
What is an LED display module?
It is a basic unit with display function that is determined by circuit and installation structure and can realize display function by simple assembly.
What is a DIP module and what are the advantages and disadvantages?
It means that the DIP package of the lamp will pass the lamp pin through the PCB board, through the welding will fill the tin in the lamp hole, by this process into the module is the plug lamp touch group, the advantages are: high brightness, good heat dissipation, the disadvantage is that the pixel density is small.
What is a SMD led module? What are the advantages and disadvantages?
SMD is also called SMT, which is a process of welding the SMT packaged lamp to the surface of the PCB board, without the lamp pin going through the PCB board.
The advantages: good display effect, high 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.
What is bi-colour, pseudo-colour and full-colour display?
By different colours of light emitting diodes are able to form different displays, dual base colour is composed of red, green or yellow-green, pseudo-colour is composed of red, yellow-green, blue three different colours, full colour is composed of red, pure green, pure blue three different colours.
What is luminous intensity?
The intensity of light emitted by a unit area of an LED display, in CD/square metre, simply the intensity of light emitted by a square metre of display.
What are brightness levels?
The number of steps of manual or automatic adjustment of the brightness of the whole screen between the lowest and highest brightness.
What is a greyscale level?
The number of technical processing steps between the darkest and the brightest of a display at the same brightness level
What is maximum brightness?
The individual base colours of an LED display at maximum brightness and maximum grey level under a given ambient illumination.
What is moiré?
When photographing a full colour LED display at work, some irregular water ripples will appear on the LED display screen, these water ripples are called "moire" in physics.
What is a PCB?
PCB is (short for printed circuit board) a printed circuit board.
What is a PCB specification?
It is the size of the board, usually expressed as an expression of the length of the board multiplied by its width, in millimetres.
What is the resolution of a cell board?
The number of pixels on a board, usually expressed as the number of rows of pixels on a board multiplied by the number of columns. (e.g. 64 x 32)
What is a BOM?
BOM is a bill of material.
What is white balance and what is white balance adjustment?
White balance is the balance of white, which is the balance of the brightness ratio of the three RGB colours; the adjustment of the brightness ratio of the three RGB colours and the white coordinates is called white balance adjustment.
What is contrast ratio?
Under a certain ambient illumination, the ratio between the maximum brightness of the LED display and the background brightness.
What is colour temperature?
The colour emitted by the light source and the black body at a certain temperature radiation light colour at the same time, the temperature of the black body is called the colour temperature of the light source.
What is chromatic aberration?
LED displays are made of a combination of red, green and blue colours to produce a variety of colours, but these three colours are made of different materials, the perspective is different, the spectral distribution of different LEDs are changing, these differences that can be observed are called chromatic aberration, when deviating from a certain angle to observe the LED, its colour changes, the human eye's ability to judge the colour of the real picture (such as a movie screen) is better than the observation of computer-generated images.
What is the frame rate?
The number of times the information on the display screen is updated per unit of time.
What is the refresh frequency?
The number of times a display screen is repeated by the display in a unit of time.
What is Perspective? What is a viewable perspective? What is the optimum viewing angle?
The angle of view is the angle between the two viewing directions of the same plane and the normal direction when the brightness of the viewing direction drops to 1/2 of the brightness of the LED display normal. Divided into horizontal and vertical viewing angles.
The viewable angle is the direction in which the image content on the display can just be seen, and the angle made by the normal to the display. The best viewing angle is the position where the content of the display can be seen just right, without discolouration, at the vertical distance from the screen where the image content is clearest.
What is a Out-of-control dots? How many types are there?
Out-of-control dots are pixel dots where the luminous state does not match the control requirements. There are three types of out-of-control dots: blind dots (also known as dead dots), constant bright dots (or dark dots) and flashing dots.
What is a static drive? What is a scanning drive? What is the difference between the two?
The "point-to-point" control from the output pin of the driver IC to the pixel dots is called static drive, while the "point-to-column" control from the output pin of the driver IC to the pixel dots is called scan drive, which requires a line control circuit: it is clear from the driver board that.
Static drive does not need line control circuit, the cost is higher, but the display effect is good, good stability, less brightness loss, etc.; scan drive it needs line control circuit, but the cost is low, the display effect is poor, the brightness loss is larger, etc.
What is a constant current driver? What is constant voltage drive?
Constant current refers to the current value specified in the design of a constant output within the operating environment allowed by the driver IC; constant voltage refers to the voltage value specified in the design of a constant output within the operating environment allowed by the driver IC.
What is the general aspect ratio of LED displays?
Graphic screens: depending on the content of the display; video screens: generally 4:3 or close to 4:3; the ideal ratio is 16:9.
How many points can a control system control?
Communication screen A card: monochrome, bi-colour 1024 x 64; communication screen B card: monochrome: 896 x 512 bi-colour: 896 x 256; DVI bi-colour screen: 1280 x 768; DVI full colour screen: 1024 x 512
What is non-linear correction?
If the digital signal output from the computer is displayed on the LED display without correction, there will be colour distortion, so in the system control circuit, the original signal output from the computer is calculated through a non-linear function to derive the signal needed for the display, because the relationship between the front and back signal is non-linear, so we often call it non-linear correction.
What is the rated operating voltage? What is the operating voltage? What is the supply voltage?
The rated working voltage is the voltage when the voltage works normally; the working voltage is the voltage value when the appliance works normally within the rated voltage range; the supply voltage is divided into AC and tributary supply voltage, our realistic AC supply voltage is AC220V --- 240V , and the DC supply voltage is usually 5V DC.DC supply voltage is generally 5V DC12V solar power supply is generally 12V
What is colour distortion?
It is the difference between the same object in nature and when it is displayed on a monitor, for the human eye's sensory vision.
What is a synchronous system and what is an asynchronous system?
Synchronous and asynchronous is relative to the computer is said, the so-called synchronous system, refers to the display of the content and computer monitor synchronous display LED display control system;.
Asynchronous system means that the computer edited display data stored in advance in the display control system, the computer shutdown will not affect the normal display of the LED display, such a control system is the asynchronous control system
What is blind spot detection technology?
The ability to detect blind spots (open and shorted LEDs) on a display through the upper software and underlying hardware, and to form a report to tell the LED screen manager, this technology is called blind spot detection technology.
What is power detection?
Through the upper software and the underlying hardware, can be on the display of the work of each power supply detection, and form a report to tell the LED screen managers, this technology is called power detection technology
What is brightness detection? What is brightness adjustment?
Brightness in brightness detection refers to the brightness of the environment where the LED display is located, through the light sensor, the display is currently located in the environment brightness detection, this detection method is called brightness detection.
The brightness in brightness adjustment refers to the brightness emitted by the LED display, the detected data is fed back to the LED display control system or control computer, and then the brightness of the display is adjusted according to this data, called brightness adjustment;.
What is a real pixel? What is a virtual pixel? What are the different types of virtual pixels? What is pixel sharing?
A real pixel is a 1:1 relationship between the number of physical pixel dots on a display and the actual number of pixel dots displayed, where the display can only show as many dots of image information as there are actual dots on the display. Virtual pixels are the number of physical pixels on the display and the actual number of pixels displayed in a 1:N (N = 2, 4) relationship, which can display two or four times more image pixels than the actual pixels on the display; virtual pixels can be divided according to the virtual way: software virtual and hardware virtual: according to the multiplication relationship is divided into 2 times virtual and 4 times virtual, according to the way the lights on a module are arranged is divided into. 1R1G1B virtual and 2R1G1B virtual.
What is remote control? Under what circumstances is it used?
Remote is not necessarily a long distance. Remote control includes both where the main console and the controlled end are within a local area network and the spatial distance is not far; and where the main console and the controlled end are within a relatively long spatial distance, and where the customer requires or, depending on the customer's control location, exceeds the distance of direct fibre optic control, then remote control is used.
What is fibre optic transmission? What is network cable transmission?
Optical fibre transmission is the exchange of electrical signals for optical signals using transparent glass fibres; network cable transmission is the direct transmission of electrical signals using metal wires.
When is a network cable used? When is fibre optic used?
When the wiring distance between the display and the control computer is less than 100 metres, use network cable transmission; when the distance between the two is less than 500 metres and more than 100 metres, use multi-mode optical fibre, when the distance is greater than 500 metres, use single-mode optical fibre.
What is Local Area Network Control? What is Internet Control?
The control of a computer within a local area network by controlling another computer or connecting to other external devices is called LAN control; the control of a master controller through the IP address of the controller in the INTERNET network is called Internet control.
What is DVI?
DVI is the abbreviation of Digital Video interface. It is now an internationally used interface for digital video signals.
What is a digital signal? What is a digital circuit?
A digital signal is a signal whose amplitude is discrete and whose amplitude representation 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 analogue signal and what is an analogue circuit?
An analogue signal is one in which the amplitude of the signal is continuous in time; the circuit that processes and controls this signal is called an analogue circuit.
What is a PCI slot?
PCI slots are expansion slots based on the PCI local bus (PEDPHERD component interconnect) and are the main expansion slots on a motherboard, allowing you to plug in different expansion cards for almost all the external functions currently available on your computer.
What is an AGP slot?
AGP is an interface specification that allows 3D graphics to be displayed at a faster speed on a normal PC. AGP is an interface used to transfer 3D graphics faster and smoother.
It uses the main memory of a normal PC to refresh the image displayed on the monitor and supports 3D graphics techniques such as texture mapping, zero buffering and alpha blending.
What is the usefulness of GPRS technology for display screens?
Data communication of our LED displays via GPRS transceiver modules on GPRS data networks based on mobile communications, allowing for remote off-site point-to-point transmission of small amounts of data for remote control purposes.
What is USB interface？
The abbreviation for USB is UNIVERSAL SERIALBUS, also known as Universal Serial Interface, which supports hot-swapping and can connect up to 127 PC external devices: there are two interface standards, USB1.0 and USB2.0.