Convert the image signal from the outside (such as Blu-ray DVD, computer, high-definition playback box, etc.) into a signal that the LED display can accept, and perform certain optimization processing on the video image to make the LED screen display The picture is clearer and smoother.
1. Screen scaling
The display mode of the LED display is point-to-point, which determines that the LED display can only display images consistent with its own physical resolution size. The LED video processor can scale the image, output the picture at any size, and complete the mapping of the entire desktop onto the LED screen.
2. Signal conversion and switching
Video processing equipment can complete format conversion between many signals. Another important function of the video processor is to manage various signals and flexibly and quickly switch between signals when multiple signals are connected.
3. Image quality improvement
Because the pixel pitch of the LED display itself is much larger than that of some other flat panel display media, there are strict requirements for image processing technology, especially image enhancement technology. Require. A high-quality LED video processor can use advanced algorithms to modify signals with poor image quality, and perform a series of processes such as deinterlacing, edge sharpening, motion compensation, etc. to enhance image details and improve picture quality.
4. Large screen splicing
The pixel pitch of the LED display screen is getting smaller and smaller, and the overall size is getting larger and larger, which makes the physical resolution of the LED screen become smaller and smaller. Got to be very huge. The LED video processor has a splicing function and can drive large-resolution screens, which is a very cost-effective driving method.
5. Multi-picture processing
In many special scenarios, a display screen needs to display multiple pictures of the same or different signals. A video processor with multi-picture processing function can flexibly meet such display requirements.
Outdoor display screens are affected by regional weather, etc., which requires the video processor to have better image quality improvement capabilities and advanced image scaling processing algorithms to ensure that the video image is maximized after scaling processing. Maintain the clarity and grayscale levels of the image to a certain extent. In addition, the video processor also needs to have rich image adjustment options and adjustment effects to process image brightness, contrast, and grayscale to ensure that the screen outputs a soft and clear picture.
Extended information
The output video control module of the LED video processor has two clock domains: the system clock domain and the display clock domain. The system clock frequency is fixed at 166MHz according to the selected SDRAM type; for a high-definition TV with a resolution of 1280×720, the display clock domain can use a frequency of about 70 MHz.
The system clock domain contains two external interfaces: the system interface, which mainly includes the instructions issued by the upper-layer system and the feedback information of the output control module; the DRAM interface, which includes the signals provided by the data dedicated bus for the output control module. Comes from requesting displayed image data from DRAM.
Baidu Encyclopedia-Video Controller
Baidu Encyclopedia-LED Video Processor