Working principle of LED display
Author:Red leaf Time:2021-06-10 08:05 Browse(561)
The basic structure of LED is an electroluminescent semiconductor material, which is placed on a shelf with leads, and then sealed with epoxy resin around to protect the internal core wire, so the anti-seismic performance of LED is good. The core part of light-emitting diode is a wafer composed of p-type semiconductor and n-type semiconductor. There is a transition layer between p-type semiconductor and n-type semiconductor, which is called p-n junction. In some semiconductor PN junctions, when the injected minority carriers are combined with the majority carriers, the excess energy will be released in the form of light, thus the electric energy can be directly converted into light energy. When the PN junction is applied with reverse voltage, it is difficult to inject a few carriers/
The basic structure of LED is an electroluminescent semiconductor material, which is placed on a shelf with leads, and then sealed with epoxy resin to protect the inner core wire, so the anti-seismic performance of LED is good.
the core part of LED is a chip composed of p-type semiconductor and n-type semiconductor.

Working principle of LED display

there is a transition layer between p-type semiconductor and n-type semiconductor, It is called p-n junction.
in some PN junctions of semiconductor materials,
when the injected minority carriers are combined with the majority carriers, the excess energy will be released in the form of light, so that the electric energy can be directly converted into light energy.
it is difficult to inject the minority carriers in the PN junction with reverse voltage, So it doesn't emit light.
this kind of diode based on the principle of injection electroluminescence is called light-emitting diode.
it is generally called led.
when it is in the positive working state (that is, the positive voltage is applied at both ends).
when the current flows from the anode to the cathode of the LED, the semiconductor crystal emits light of different colors from ultraviolet to infrared, The intensity of light is related to the current.
energy saving lamp is a kind of special fluorescent lamp.
it is based on the fluorescent powder on the lamp body excited by ultraviolet light.
at present, most of energy saving lamps are gas discharge lamps excited by electronic circuits.
LED is a light-emitting diode, which can be directly ignited by rated voltage, From the perspective of development, it is a new type of energy-saving lamp..
(1) led display system compositionThe system consists of special computer equipment, display screen, video input port and system software1. Computer and special equipment: computer and special equipment directly determine the function of the system.
different types can be selected according to different requirements of users for the system   2. Display screen: the control circuit of the display screen receives the display signal from the computerThe LED is driven to emit light to generate pictures, and the sound is output by adding power amplifier and speaker.
the LED is driven to emit light to generate pictures   3. Video input port: provide video input port.
the signal source can be VCR, VCR, camera, etc., and support NTSC, pal, s, etc_ Video and other formats   4. System software: special software for LED playback is provided.
PowerPoint or es98 video playback software is provided   ( 2) LED display system function   The system has the following functions:   1. The computer is used as the processing control center.
the electronic screen corresponds to a certain area of the computer display (VGA) window point by point, the display content is synchronized in real time, the screen mapping position is adjustable, and the size of the display screen can be easily selected at will.
the system has the advantages of simple operation, convenient operation and convenient operationtwo   The display dot matrix adopts ultra-high brightness LED (red and green dual primary colors).
256 gray levels, 65536 color change combinations, rich and realistic colors, and supports VGA 24 bit true color display mode.
the display dot matrix adopts ultra-high brightness LED (red and green dual primary colors)three   It is equipped with graphic information and three-dimensional animation playing software.
it can play high-quality graphic information and three-dimensional animation.
there are more than ten ways to display information in the playing software, such as covering, closing, opening curtain, color alternation, zooming in and out.
the software can play high-quality graphic information and three-dimensional animation   4. Special program editing and playing software can be used to edit, add, delete and modify text, graphics, images and other information through keyboard, mouse, scanner and other different input means.
the program is arranged and stored in the hard disk of the control host or server, and the program playing sequence and time can be integrated and overlapped with each other.
the program can be edited and played in an integrated way   It can receive and display video signals such as VCR and VCD(3) Introduction and classification of LED electronic display system           In recent years, LED display market has developed rapidlyIt has been widely used in banks, posts and telecommunications, taxation, airports, stations, securities markets and other trading markets, hospitals, electric power, customs, stadiums and many other occasions that need to be announced and publicized(4) Working principle of LED display screen   Indoor multimedia LED electronic display system mainly includes:Control computer (or a workstation in the network), video signal processing and control, communication transmission and control, data distribution and scanning control, LED display box, etc.
in this paper, the design and implementation of the system are introducedThe following is a brief introduction to the basic working principle of each part   1. Control computer (or network)   The control computer (or a workstation on the network) controls the display effect of the electronic display screen.
it can run a program list compiled according to the user's needs and extract the relevant display data on the computer's local hard disk or the network server.
of course.
it can also artificially produce the display effect of the LED screen.
the pixels on the screen and the screen control computer's display The pixels in the corresponding region are mapped one by one.
directly   The computer can be controlled by the electronic display screen.
the brightness, contrast and chroma of the display screen can be adjusted manually or automatically, and the gray correction data suitable for the current environment can be selected. The computer can transmit the information to be displayed to the video signal processor and the control unit for video information processing.
the system can be used to control the computer    2. Video signal processing control system   The video processing controller is a set of multimedia video card specially designed for LED display screen.
it is used for image processing of display data, including: gray adjustment, brightness adjustment, image noise reduction, motion compensation, color coordinate space transformation, chroma adjustment function, mosaic elimination, etc.
the video processing controller is a set of multimedia video card specially designed for LED display screen   The video controller can transmit the processed display information to the communication module for long distance transmission to the display screenCommunication system   The communication system controls the computer and the display screen by connecting 25 pairs of super five twisted pairs.
it effectively ensures that the contents displayed on the computer display will be transmitted to the display screen.
the communication system can be used to control the computer and the display screenPowerful giant color photoelectric.
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