LED is a solid-state semiconductor device, which can directly convert electricity into light. The core of LED is semiconductor chip. One end of the chip is attached to the bracket, one end is the negative electrode, and the other end is connected to the positive electrode of the power supply, so that the whole chip is encapsulated by epoxy resin. The semiconductor wafer consists of two parts, one is a P-type semiconductor, in which holes are dominant, and the other is an N-type semiconductor, mainly electrons. But when these two semiconductors are connected together, a "pn junction" is formed between them. When the current acts on the chip through the wire, the electrons will be pushed to the P region, where the electrons will recombine with the holes, and then the energy will be emitted in the form of photons, which is the principle of LED display.
LED system composition
The system consists of special computer equipment, display screen, video input port and system software.
Computers and special equipment: Computers and special equipment directly determine the functions of the system, and different types can be selected according to the different requirements of users for the system.
Display screen: the control circuit of the display screen receives the display signal of the computer, drives the LED to emit light to generate a picture, and outputs sound by adding a power amplifier and a sound box.
Video input port: provides a video input port. The signal source can be a video recorder, DVD player, video camera, etc. , and supports NTSC, PAL, S_Video and other standards.
System software: provide LED playing special software, powerpoint or ES98 video playing software.
The working principle of led display screen The basic structure of LED is a piece of electroluminescent semiconductor material, which is put on the shelf with leads and then sealed with epoxy resin to protect the internal core wire, so the LED has good seismic performance. The core of LED is a chip 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 pn junction. In the PN junction of some semiconductor materials, when the injected minority carriers recombine with the majority carriers, the excess energy will be released in the form of light, thus directly converting electric energy into light energy. When reverse voltage is applied to PN junction, minority carriers are difficult to inject, so they do not emit light. This kind of diode made by injection electroluminescence principle is called light emitting diode, commonly known as led. When working in the forward direction (that is, DC voltage is applied at both ends), when the current flows from the anode of the LED to the cathode, the semiconductor crystal emits different colors of light from ultraviolet to infrared, and the intensity of light is related to the current. Energy-saving lamp can be said to be a special fluorescent lamp, which is based on the fluorescent powder on the lamp body being excited by ultraviolet light. Nowadays, most energy-saving lamps refer to gas discharge lamps excited by electronic circuits, while LEDs are light-emitting diodes, which can be directly ignited by rated voltage. From the development point of view, it is a new type of energy-saving lamp.
The only difference between LED and LCD is that backlight and panel are the same.
It is somewhat deceptive for merchants to say so.
The real LED is just like the big billboard on the wall we see.
Both of their panels are LCD panels, also called TN panels.
The types of backlight, LED and CCFL, are diode and cold cathode tube respectively. You will understand it in Baidu.
In contrast, of course, diodes are good, energy-saving and environmentally friendly, with small space, high brightness and fashion.
But the price is more expensive.
If you are optimistic that the two prices are similar, buy LED. If the difference is too much, buy an LCD.
LCD is also beneficial. I think the tube is softer and the adjustable range is higher.
How the led display works—
(1) system composition
The system consists of special computer equipment, display screen, video input port and system software.
Computers and special equipment: Computers and special equipment directly determine the functions of the system, and different types can be selected according to the different requirements of users for the system.
Display screen: the control circuit of the display screen receives the display signal of the computer, drives the LED to emit light to generate a picture, and outputs sound by adding a power amplifier and a sound box.
Video input port: provides a video input port. The signal source can be a video recorder, DVD player, video camera, etc. , and supports NTSC, PAL, S_Video and other standards.
System software: provide LED playing special software, powerpoint or ES98 video playing software.
(2) System function
The system has the following functions:
With the computer 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, and the screen mapping position can be adjusted, which is convenient for choosing the display screen size at will.
The display lattice adopts ultra-high brightness LED (red and green double primary colors), 256 shades of gray and 65,536 combinations of color changes, with 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. There are more than ten ways for playing software to display information, such as covering, closing, opening curtains, alternating colors, zooming in and out, etc.
Using special program editing and playing software, you can edit, add, delete and modify information such as text, graphics and images through different input means such as keyboard, mouse and scanner. Arrange the playing sequence and time of programs stored in the hard disk of the control host or server, so as to realize integrated alternating playing and overlapping.
Can receive and display video signals, such as video recorders and DVD players.
Brief introduction and classification of LED electronic display system
In recent years, the LED display screen market has developed rapidly, and has been widely used in trading markets such as banks, posts and telecommunications, taxation, airports, stations, securities markets, hospitals, electric power, customs, stadiums and gymnasiums, etc. where announcements and publicity are needed.
LED is short for light emitting diode. LED display screen is a display device composed of light emitting diodes. Adopting low-voltage scanning drive has the following advantages: 1, power saving, 2, long service life, 3, low cost, 4, high brightness, 5, large viewing angle, 6, long visual distance, 7, and many specifications and varieties.
LED display product series:
A, monochrome, color bar display screen b, computer-controlled digital display screen c, monochrome graphic display screen d, tricolor (red, green and yellow) graphic display screen e, dot matrix and digital mixed display screen (security screen) f, bicolor (red, green and blue) multimedia video synchronous display screen g, tricolor (red, green and blue) multimedia.
LED display screen classification:
According to the display color, it is divided into three colors: single red, single green, double primary colors of red and green and red, green and blue.
According to the use function, it is divided into: graphic display, multimedia video display, market display and bar display.
According to the use environment, it is divided into indoor display, outdoor display and semi-outdoor display.
According to the diameter of the luminous point, it can be divided into: φ3.0, φ3.7, φ4.8, φ5.0, φ8.0, ph8, ph 10, ph 16, ph20, etc.
Among the LED display screens with basic light-emitting points on the market, indoor LED display screens can be divided into 3mm, 3.75mm, 5mm, 8mm and φ 10mm according to the diameter of LED single point. Outdoor LED display screen can be divided into φ 16mm, φ 19mm, 22mm and 26mm according to pixel diameter. According to the size of LED display screen used in the market category, it is divided into 2.0cm(0.8 inch), 2.5cm( 1.0 inch), 3.0cm( 1.2 inch), 4.6cm (1.8 inch) and 5.8cm(2.3 inch).
Display color: LED display screen is divided into monochrome LED display screen (including pseudo-color LED display screen), two-color LED display screen and full-color (three-color) LED display screen according to display color. According to the gray scale, it can be divided into 16, 32, 64, 128 and 256 gray LED display screens.
Display efficiency: LED display screens are divided into text LED display screens, graphic LED display screens, computer video LED display screens, TV video LED display screens and market LED display screens according to display efficiency. Quote LED displays usually include LED displays for securities, interest rates, futures and other purposes.
Technical characteristics of LED display screen:
A, excellent effect: using dynamic scanning technology, the picture is stable, without miscellaneous points, the image effect is clear, and the animation effect is vivid and diverse; The video effect is smooth; B, rich in content: it can display text, charts, images, animations and video information; C. Flexible mode: users can arrange the display mode at will; D quality assurance: imported luminescent materials, high-quality IC chips and noise-free high-power power supply are adopted; E, large amount of information: the information displayed is not limited; F, convenient maintenance: modular design, convenient installation and maintenance;
Is the color display an led display? Nonsense, LCD and LED display are not the same concept. Well, can LCD be used outdoors? If you want to know more, you can talk privately.
Find the manufacturing process of LED color display screen. There is nothing too special about the manufacturing methods of full color and monochrome. The basic manufacturing process is as follows:
1. Customize the cell board according to the actual size, customize the box according to the cell board, and install it. (You must not cut corners when choosing the power cord! 2? To 2.5? Pure copper power cord is more suitable, single strand is more durable, but the cost is high, and multiple strands are also acceptable. )
2. Customize the control card. Customize a certain number of control cards according to the screen size. The number of control cards is even. The full-color control system is divided into two parts: sending and receiving. I really won't do it myself, and I won't call the manufacturer. (It is recommended to install the control card after installing the box to reduce unnecessary damage. )
3. When assembling the box, the steel structure can be welded at the position where the screen body is installed, which saves time and improves work efficiency.
4. Install the control system after assembly. Be sure to double-check whether the box is electrified before sending electricity, or your loss will be miserable! It is best to test in sections and finally send electricity as a whole. Don't miss the grounding of the power supply! After electrifying, the static electricity is very large, which has an impact on human injury and screen life.
All that's left is a simple test, keeping it the same as monochrome.
The assembly method of led color display screen has good quality, good service and high cost performance, so who are we? (See Introduction to Smart Links)
We are all the oldest veterans of the LED display industry in Wuhan, providing various types of LED display users in Hubei Province, as well as the maintenance and transformation of LED displays made by different companies in the industry.
We provide you with fast, efficient, high-quality, professional LED display installation, repair, maintenance, upgrade and other services.
① Install and maintain LED display control system (monochrome, indoor and outdoor full color) for customers to solve problems quickly.
② Transform or upgrade the LED display control system for customers.
③ Provide customers with system-level and wafer-level maintenance of indoor and outdoor single and double primary colors and full-color LED displays. .
④ Provide customers with LED display control software upgrade.
Sign up to provide you with full-screen after-sales service.
⑥ Provide technical support for LED display multimedia card, video processor and display system.
⑦ Answer some technical questions about the failure of the display screen.
Undertake LED display screen renovation/screen cleaning /LED projects of various large and medium-sized groups.
We have Jin Gangzuan, and we are not afraid of porcelain work!
Working principle of led electronic display screen
We mainly analyze the working principle of LED electronic display screen from three aspects:
(A) the composition of the LED electronic display system
The system consists of special computer equipment, display screen, video input port and system software.
Computers and special equipment: Computers and special equipment directly determine the functions of the system, and different types can be selected according to the different requirements of users for the system.
Display screen: the control circuit of the display screen receives the display signal of the computer, drives the LED to emit light to generate a picture, and outputs sound by adding a power amplifier and a sound box.
Video input port: provides a video input port. The signal source can be a video recorder, DVD player, video camera, etc. , and supports NTSC, PAL, S_Video and other standards.
System software: provide LED playing special software, powerpoint or ES98 video playing software.
The schematic diagram of the system is as follows:
(2) Functions of LED electronic display system
The system has the following functions:
With the computer 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, and the screen mapping position can be adjusted, which is convenient for choosing the display screen size at will.
The display lattice adopts ultra-high brightness LED (red and green double primary colors), 256 shades of gray and 65,536 combinations of color changes, with 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. There are more than ten ways for playing software to display information, such as covering, closing, opening curtains, alternating colors, zooming in and out, etc.
Using special program editing and playing software, you can edit, add, delete and modify information such as text, graphics and images through different input means such as keyboard, mouse and scanner. Arrange the playing sequence and time of programs stored in the hard disk of the control host or server, so as to realize integrated alternating playing and overlapping.
Can receive and display video signals, such as video recorders and DVD players.
Brief introduction and classification of LED electronic display system
In recent years, the LED electronic display screen market has developed rapidly, and has been widely used in trading markets such as banks, posts and telecommunications, taxation, airports, stations, securities markets, hospitals, electric power, customs, stadiums and other places that need publicity.
LED is short for light emitting diode. LED display screen is a display device composed of light emitting diodes. Adopting low-voltage scanning drive has the following advantages: 1, power saving, 2, long service life, 3, low cost, 4, high brightness, 5, large viewing angle, 6, long visual distance, 7, and many specifications and varieties.
LED display screen classification:
According to the display color, it is divided into three colors: single red, single green, double primary colors of red and green and red, green and blue.
According to the use function, it is divided into: graphic display, multimedia video display, market display and bar display.
According to the use environment, it is divided into indoor display, outdoor display and semi-outdoor display.
Technical characteristics of LED display screen:
A, excellent effect: using dynamic scanning technology, the picture is stable, without miscellaneous points, the image effect is clear, and the animation effect is vivid and diverse; The video effect is smooth; B, rich in content: it can display text, charts, images, animations and video information; C. Flexible mode: users can arrange the display mode at will; D quality assurance: imported luminescent materials, high-quality IC chips and noise-free high-power power supply are adopted; E, large amount of information: the information displayed is not limited; F, convenient maintenance: modular design, convenient installation and maintenance;
Shenzhen Sunwitt Optoelectronic website has a detailed introduction.