Shenzhen Three Li Heng Ying Technology Co。, Ltd。
Company address: No。 2266 Longgang Avenue, Longgang District, Shenzhen
Factory address: 3 building C9, Xin'an second industrial district, Xixiang street, Baoan District, Shenzhen
A method of finding a new type of LED display to get the display data
As a new type of display media, LED display is a high-tech product integrating photoelectric and computer technology. With the rapid development of large scale integrated circuits and computer technology, it has been developed rapidly and has been widely used in all walks of life.
In the LED display system, most are used for transmission, processing, control signals are digital signals, and most of the computer and the external display are connected through the analog VGA interface device between internal computer digitally born to display the image information, the graphics in the D / A (analog / digital) converter changes R, G, B color signal and line field synchronous signal, the signal through the cable to the display device. For analog display devices, such as analog CRT displays, signals are directly sent to the corresponding processing circuits to drive and control the imaging of Guan Tiansheng images. For LCD, DLP and other digital display devices, the display device needs to configure the corresponding A / D (analog / digital) converter to transform the analog signals into digital signals.
Is now on the market there are many digital display interface products, they have a special output interface on the computer screen digital red, green and blue three primary color signals and control signals, but most of these products are high price, sometimes there are compatibility topics, but also did not form the same standard.
LED display screen
So the analog interface, display data method mainly has two kinds: one is the special LED display of multimedia video by manufacturers to provide the data acquisition card, realizing synchronous display LED display and computer; second is to obtain data by intercepting display analog signal output card, realizing synchronous display LED display and computer. Both of these two technologies have already been formed and applied to the actual work of the LED display.
For the first plan, the development of science and technology will lead to the rapid upgrading of all kinds of products。 Multimedia video cards will cause unnecessary economic and resource waste due to continuous technological updating, and thus be eliminated by the market。 For the second schemes, the adaption of the product is poor due to the need for constant transformation of parameters for different display cards and resolution settings。
Based on the above situation, this paper presents a new method to realize the synchronous display of LED display and computer, which can completely replace multimedia video card, thereby avoiding some disadvantages of the existing multimedia video card, and realizing the connection with the international display industry standard.
The design principle of 2VGA conversion interface card
The basic working principle of VGA conversion interface card is that A / D acquisition technology is adopted to collect image information directly from analog output of general display card, no need to install multimedia video card again. The analog signal through the A / D converter into a digital signal to the display screen; another analog signal through a video preamplifier is to simulate the signal form back to the CRT display, so that the display content and display the contents of LED keep consistent, and can monitor the acquisition effect. The A / D system, but also reduces the complexity of installation and operation. The VGA conversion interface card, as the peripherals of the computer, can be "not installed on the machine", thus improving the compatibility of the whole system.