Novastar VX1000 Video Processor With 10 LAN Ports For Rental LED Video Wall

LED Display 6 Key Technologies

LED electronic display has good pixels, no matter day or night, sunny or rainy days, LED display can let the audience see the content, to meet people's demand for display system.

Image acquisition technology

The main principle of LED electronic display is to convert digital signals into image signals and present them through the luminous system. The traditional method is to use video capture card combined with VGA card to achieve display function. The main function of video acquisition card is to capture video images, and obtain the index addresses of line frequency, field frequency and pixel points by VGA, and obtain digital signals mainly by copying the color lookup table. Generally, software can be used for real-time replication or hardware theft, compared with hardware theft is more efficient. However, the traditional method has the problem of compatibility with VGA, which leads to blurred edges, poor image quality and so on, and finally damages the image quality of electronic display.
Based on this, industry experts developed a dedicated video card JMC-LED, the principle of the card is based on PCI bus using 64-bit graphics accelerator to promote VGA and video functions into one, and to achieve the video data and VGA data to form a superposition effect, the previous compatibility problems have been effectively solved. Secondly, the resolution acquisition adopts the full-screen mode to ensure the full Angle optimization of the video image, the edge part is no longer fuzzy, and the image can be arbitrarily scaled and moved to meet different playback requirements. Finally, the three colors of red, green and blue can be effectively separated to meet the requirements of true color electronic display screen.

Real image color reproduction

The principle of the LED full-color display is similar to that of the television in terms of visual performance. Through the effective combination of red, green and blue colors, different colors of the image can be restored and reproduced. The purity of the three colors red, green and blue will directly affect the reproduction of the image color. It should be noted that the reproduction of the image is not a random combination of red, green and blue colors, but a certain premise is required.

First, the light intensity ratio of red, green and blue should be close to 3:6:1; Secondly, compared with the other two colors, people have a certain sensitivity to red in vision, so it is necessary to evenly distribute red in the display space. Thirdly, because people's vision is responding to the nonlinear curve of the light intensity of red, green and blue, it is necessary to correct the light emitted from the inside of the TV by white light with different light intensity. Fourth, different people have different color resolution abilities under different circumstances, so it is necessary to find out the objective indicators of color reproduction, which are generally as follows:

(1) The wavelengths of red, green and blue were 660nm, 525nm and 470nm;

(2) The use of 4 tube unit with white light is better (more than 4 tubes can also, mainly depends on the light intensity);

(3) The gray level of the three primary colors is 256;

(4) Nonlinear correction must be adopted to process LED pixels.

The red, green and blue light distribution control system can be realized by the hardware system or by the corresponding playback system software.