Publisher: Supplier of LED Display Time: 2022-08-05 19:27 Views: 835
With the continuous acceleration of the urbanization process, in order to meet the promotion needs of various industries, all streets and alleys are occupied by various full-color LED displays, which also presents a problem that everyone is more concerned about, then What is the working principle of LED full color display? Next, the editor of Liancheng will give you an analysis one by one!
We should often see colored light-emitting diodes on some roads, which can be called a full-color LED display, and the full-color LED screen is controlled by the display method of RGB semiconductor light-emitting diodes, composed of many RGB three It is composed of light-emitting diodes of different colors, and each pixel combination has RGB diodes. A display screen used to display various information such as text, graphics, images, animations, market quotations, videos, and video signals. Its working principle is actually very similar to that of a color TV display, which is to restore and reproduce the image color through different light intensities of red, green and blue.
If you want to understand the working principle of the full-color LED display, you must first figure out the various signal directions of the LED display. The LED display mainly has 5 kinds of signals, and these 5 kinds of signals must cooperate to complete the data transmission to complete the The display of the display works.
LED full-color display display principle and signal trend analysis
The led display is composed of three parts: data acquisition system, control system, and display system. The direction of the data signal is: peripherals - computer - DVI graphics card - data sending card - data receiving card - HUB adapter board - display screen.
The actual situation is that the HUB adapter board is used as the last link of data transmission, and all signals can be found on the HUB adapter board. The HUB adapter board is a card board that divides the signal sent by the control board into several tributaries, also called a breakout board. Under normal circumstances, it is determined according to the vertical number of modules of the LED electronic screen itself.
The various signals contained in the display. The signal starts from the HUB board and is connected to the unit board or module through the cable to complete the data transmission. Except for the data signal, which is transmitted serially, all other signals are transmitted in parallel. Now the various signal effects are analyzed as follows:
1. CLK clock signal
Shift pulses supplied to the shift register, each pulse will cause data to be shifted in or out one bit. The data on the data port must be coordinated with the clock signal to transmit data normally, and the frequency of the data signal must be 1/2 times the frequency of the clock signal. In any case, when the clock signal is abnormal, it will make the whole board display chaotic.
2. STB latch signal
When one channel of data transmission is completed, the STB latch signal is valid, the data in the shift register is latched, and the data content is displayed by lighting the LED through the drive circuit. However, since the drive circuit is controlled by the EN enable signal, the premise of its lighting must be the enable state. The latch signal also needs to be coordinated with the clock signal to display a complete image. In any case, when the latch signal is abnormal, it will make the whole board display chaotic.
3. EN enable signal
The whole screen brightness control signal is also used for screen blanking. Just adjust its duty cycle to control the change in brightness. When the enable signal is abnormal, the whole screen will appear dark, dark or trailing.
4. Color data signal
Provides the data required to display the image. It must be coordinated with the clock signal to transmit data to any one of the display points. Generally, the data signals of red, green and blue are separated in the LED display screen. If a data signal is short-circuited to the positive or negative pole, the corresponding color will be fully lit or not lit. When the data signal is suspended, the corresponding color will appear. Display is uncertain.
5.ABCD line signal
It only exists in dynamic scanning display. ABCD is actually a binary number, and A is the lowest bit. If the ABCD signal is expressed in binary, the maximum control range is 16 lines (0000-1111), and only the AB signal is required in the 1/4 scan. Because the representation range of the AB signal is 4 lines (00-11). When the line control signal is abnormal, there will be display dislocation, highlight or image overlap.
the working principle of full color led display
1. System composition
The system is composed of special computer equipment, display screen, video input port and system software.
Computer and special equipment: The computer and special equipment directly determine the function of the system, and different types can be selected according to the different requirements of users for the system.
LED display screen: The control circuit of the display screen receives the display signal from the computer, drives the LED to emit light to produce a screen, and outputs sound by adding power amplifiers and speakers.
Video input port: Provide video input port, the signal source can be VCR, DVD player, video camera, etc. It supports NTSC, PAL, S_Video and other formats.
System software: Provide special software for LED playback, powerpoint or ES98 video playback software.
2. System function
The system has the following functions:
Taking the computer as the processing control center, the electronic screen corresponds to a certain area of the computer monitor (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 and arbitrarily selected.
The display dot matrix adopts ultra-high brightness LED light-emitting tube (red and green dual primary colors), 256-level grayscale, 65536 kinds of color change combinations, rich and vivid colors, and supports VGA 24-bit true color display mode.
Equipped with graphic information and 3D animation playback software, it can play high-quality graphic information and 3D animation. The playback software displays information in more than ten forms, including covering, closing, opening curtains, alternating colors, and zooming in and out.
Using special program editing and playing software, you can edit, add, delete and modify text, graphics, images and other information through different input means such as keyboard, mouse, and scanner. The arrangement is stored in the control host or the hard disk of the server, and the program play sequence and time can realize integrated alternate play and can be superimposed on each other.
It can receive video signals such as video recorders and DVD players.
The above is the display principle of LED full color display screen organized by LCF Xiaobian for you, welcome to add or correct it. LCF is a world-leading provider of LED display applications and solutions, as well as a national-level specialized, special, and new little giant enterprise. The main business covers "smart city", "cultural tourism business performance", "commercial display project", "content technology" four major sections, with the world's leading automated production equipment and modern post-doctoral research laboratory and perfect sales and services team. Friends who want to buy LED display can also contact us, LCF LED display manufacturer, a big country brand, trustworthy!