Image Signal Processing of LED Display Screen

There are generally two methods for processing image signals on LED display screen:

Image Signal Processing of LED Display Screen 1

One method is to use a special large screen signal processor to process the interlaced TV signal into progressive signal, and then play it on the large screen. The high-performance processor can process more than 10 bits. When doing scanning transformation, interpolation operation, motion prediction and compensation, scanning transformation and so on should be carried out. Now high-order large LED screens also use this method, and carry out more image signal processing, trying to improve the signal to the broadcast level, of course, the effect is also better. Computer images are also processed by this processor and then sent to the large screen for display. Processing technology is still developing, and many new algorithms have been proposed. This method is widely used in large-size back projection TV and plasma large screen TV, and the effect is much better than that of ordinary TV. In this case, the output signal is usually described according to the transformed signal format, which is more accurate.

Another method is the multimedia method, commonly known as the synchronous screen method. This method uses an ordinary multimedia card to capture TV signals, demodulate, filter and separate timbre. After a / D conversion, the image signal is encoded and compressed by MPEG for storage. Decompress it when playing and watch it directly on the computer monitor. The signal sent to the large screen is obtained from the DVI interface or graphics card of the computer through a special interface card, and some processing needs to be carried out on the interface card. At this time, the large screen is actually equivalent to the monitor of the computer or a part of it, usually called window, which can realize one-to-one synchronous display. Because the computer monitor scans line by line, if the frame and line extraction processing is not carried out for the display signal, the display format of the large screen is the format of the monitor.

For example, VGA format is a progressive scanning format with 640x480 pixels, and its scanning update rate is 75Hz. However, the 75Hz progressive scanning signal here is not the improvement of the image source itself, and the image quality has not been improved. In fact, it is worse than the standard of 50Hz interlaced scanning, similar to the effect of DVD or VCD, which is often confused. As for some screens, the screen is changed. For example, the even screen information is discarded and only the odd screen information is sent to display. Of course, the effect is worse. Incidentally, the situation of non video programs is relatively simple. Although some game animations also require good continuity, for animations played on the large screen, the picture update rate of more than 10Hz is acceptable.

For the display screen controlled by the embedded controller or single chip microcomputer, the program is generated by the controller. Limited by the processing capacity of the controller, the speed of providing the picture is not fast enough, which will cause the picture discontinuity. The most typical phenomenon is that the bar screen controlled by single chip microcomputer is not smooth but jumping when the text moves left or right. Both experience and calculation show that if a bar screen composed of 10 16xi6 dot matrix Chinese characters wants to move the whole picture to the left at the speed of 5 seconds, its frame rate must reach more than 15Hz in order to move smoothly and coherently.

Image Signal Processing of LED Display Screen 2

get in touch with us
recommended articles
FAQ
How to Quickly Solve the Heat Dissipation Problem of LED Display Screen
?1. The fatal bane of electronic products is that the temperature is too high, because high temperature will lead to a series of problems such as reduced reliability, unstable performance and shortened service life of electronic products. The display screen is also afraid of high temperature, so engineers have taken various methods to solve the heat dissipation problem in order to control the temperature of electronic parts inside the display screen and make it not exceed the specified higher allowable temperature under the working environment conditions of the display screen.2. In fact, when selecting the heat dissipation mode, we should consider the following issues: heat flux density, volume power density, total power consumption, surface area, volume, working environment conditions (temperature, humidity, air pressure, dust, etc.) of the display screen.3. According to the principle of heat conduction, there are natural cooling, forced air cooling and direct liquid cooling; Evaporation cooling; Thermoelectric cooling; Heat pipe heat transfer and other heat dissipation methods.Common heat dissipation methods of display1. It is a common method to use a long-life and high-energy fan to strengthen heat dissipation inside the lamp shell. This method has low cost and good effect.2. Aluminum cooling fins are used, which is a common heat dissipation method. Aluminum cooling fins are used as part of the shell to increase the heat dissipation area.3. Aerodynamics, using the shell shape to produce convective air, which is a low-cost method to strengthen heat dissipation.4. Surface radiation heat dissipation treatment: the surface of the lamp shell is treated with radiation heat dissipation. The simpler thing is to apply radiation heat dissipation paint, which can bring the heat away from the surface of the lamp shell by radiation.5. The purpose of heat conduction and heat dissipation is to reduce the working temperature of the high-definition display chip. Due to the large difference between the expansion coefficient of the chip and the expansion coefficient of our common metal heat conduction and heat dissipation materials, the chip cannot be directly welded to avoid the high and low temperature thermal stress damaging the display chip.6. The heat conduction tube is used for heat dissipation, and the heat is guided from the display chip to the shell heat dissipation fin by using the heat conduction tube technology.7. The heat conducting plastic shell is made of heat conducting plastic material during injection molding of the plastic shell, so as to increase the heat conduction and heat dissipation capacity of the plastic shell.Advantages and applications of digital displayDigital display is a display that receives and processes digital signals. In various electronic control equipment, digital display has become an indispensable and important link. The electronic devices and corresponding driving circuits used for digital display are called digital display.Application of tif100 thermal conductive silica gel in monitorTif100 thermal conductive silica gel sheet series thermal conductive interface materials are used to fill the air gap between heating devices and heat sinks or metal bases. Their flexible and elastic characteristics enable them to cover very uneven surfaces. Its excellent performance enables heat to be transmitted from the heating device or the overall circuit board to the metal shell or diffusion plate, so as to improve the efficiency and service life of the heating electronic components.Characteristics of tif100-30-50e heat conductive silica gel productsTif100-30-50e pressure gauge for heat conductive silica gel products
How to Choose a Led Display Screen for Your Premies to Attract Customer
How to Realize the Intelligent Configuration Design of LED Display Screen in Installation and Debugg
With the Rapid Development of LED, the Supporting Equipment of LED Display Screen Needs to Be Upgrad
What Kind of LED Display Screen Is More Suitable for Party and Government Organs
How to Judge the Quality of Huge LED Display Screen, Three Key Words and Technical Indicators
Explanation of Common Terms of LED Display Screen
As for the Size of LED Display Screen, Can It Be Enlarged at Will
How Can the Heat Dissipation of LED Display Screen Be Improved
For the Size of LED Display Screen, Can Its Size Be Enlarged at Will
related searches
How to Quickly Solve the Heat Dissipation Problem of LED Display Screen
How to Realize the Intelligent Configuration Design of LED Display Screen in Installation and Debugg
With the Rapid Development of LED, the Supporting Equipment of LED Display Screen Needs to Be Upgrad
What Kind of LED Display Screen Is More Suitable for Party and Government Organs
Explanation of Common Terms of LED Display Screen
As for the Size of LED Display Screen, Can It Be Enlarged at Will
How Can the Heat Dissipation of LED Display Screen Be Improved
For the Size of LED Display Screen, Can Its Size Be Enlarged at Will
Ten Common Faults and Solutions of LED Display Screen
Contact US

    Bao’an District  Shenzhen City, China

     +86 189 3806 5764

NEWSLETTER SUBSCRIBE
no data
Copyright © 2021 CrowBerry

   

chat online
NEED HELP? WE'RE HERE!