The working principle of LED display screen -
(1) System composition
This 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 user's different requirements for the system.
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 picture, and outputs sound by adding a power amplifier and speakers.
Video input port: Provides a video input port. The signal source can be a video recorder, DVD player, 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 functions
The system has the following functions:
With the computer as the processing control center, the electronic screen and the computer monitor (VGA) window are connected Areas correspond to each other point by point, display content is synchronized in real time, and the screen mapping position is adjustable, making it easy to choose the size of the display screen at will.
The display dot matrix uses ultra-high brightness LED light-emitting tubes (red and green dual primary colors), 256 levels of grayscale, 65536 color change combinations, rich and realistic 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 ways, including covering, closing, opening curtains, alternating colors, and zooming in and out.
Using special program editing and playback software, you can edit, add, delete and modify text, graphics, images and other information through different input means such as keyboard, mouse, scanner and so on. The arrangement is stored in the control host or server hard disk, and the program playback sequence and time can be integrated and alternately played, and can be superimposed on each other.
Can receive and display video signals from video recorders, DVD players, etc.
Introduction and classification of LED electronic display systems
The LED display market has developed rapidly in recent years and has been widely used in banks, postal and telecommunications, taxation, airports, stations, and securities markets And other trading markets, hospitals, electric power, customs, stadiums and other occasions where announcements and publicity are required.
LED is the English abbreviation of Light Emitting Diode. The LED display screen is a display device composed of an arrangement of light-emitting diodes. It uses a low-voltage scan driver and has the following advantages: 1. Low power consumption, 2. Long service life, 3. Low cost, 4. High brightness, 5. Large viewing angle, 6. Long viewing distance, 7. Various specifications and varieties. .
LED display product series:
A. Monochrome, color bar display, B. Computer-controlled digital display, C. Monochrome graphic display, D. Three Color (red, green, yellow) graphic display screen, E, dot matrix and digital hybrid display screen (securities screen), F, dual primary color (red, green) multimedia video synchronization display screen, G, three primary color (red, green) , blue) multimedia video synchronization display
LED display classification:
According to the display color, it is divided into: single red, single green, red and green dual primary colors, red, green and blue three colors< /p>
According to the use function, it is divided into: graphic display screen, multimedia video display screen, market display screen, and bar display screen
According to the use environment, it is divided into: indoor display screen and outdoor display screen. , Semi-outdoor display screen
According to the diameter of the light-emitting point, it is divided into: φ3.0, φ3.7, φ4.8, φ5.0, φ8.0, ph8, ph10, ph16, ph20, etc.
In basic light-emitting point non-market LED displays, indoor LED displays can be divided into Φ3mm, Φ3.75mm, Φ5mm, Φ8mm, and Φ10mm display screens according to the LED single point diameter used; outdoor LED displays The display screen can be divided into Φ16mm, Φ19mm, Φ22mm and Φ26mm LED display screens according to the pixel diameter used. According to the size of the digital tube used in the market LED display screen, it can be divided into 2.0cm (0.8inch), 2.5cm (1.0inch), 3.0cm (1.2inch), 4.6cmm (1.8inch), 5.8cm (2.3inch), 7.6 cm (3inch) and other LED displays.
Display color: LED displays are divided into single-primary color LED displays (including pseudo-color LED displays), dual-primary color LED displays and full-color (three primary color) LED displays according to display color. According to the gray scale, it can be divided into 16, 32, 64, 128, 256 gray scale LED displays, etc.
Display performance: According to the display performance, LED displays are divided into text LED displays, graphic LED displays, computer video LED displays, TV video LED displays and market LED displays, etc. Market LED displays generally include LED displays for securities, interest rates, futures and other purposes.
Technical features of LED display screen:
A. Excellent effect: using dynamic scanning technology, the picture is stable, no noise, the image effect is clear, the animation effect is vivid and diverse; the video effect is smooth ; B. Rich content: can display text, charts, images, animations, and video information; C. Flexible method: the user can arrange the display mode arbitrarily; D. Quality assurance: using imported luminescent materials, high-quality IC chips, noise-free and high-power Power supply; E. Large amount of information: the displayed information is not restricted; F. Easy maintenance: modular design, easy installation and maintenance;