An apparatus and method to high quality image implementation technology for improving outdoor visibility of LED display Board

摘要

The present invention focuses on the fact that the human eye perceives low luminance of the LED signboard during the daytime when the daylight illuminance increases relative to the change in the ambient brightness, that is, the daylight illuminance, which is an external environment, and is perceived as high at night when the daylight illuminance decreases. In order to improve the visibility of the outdoor by matching the brightness and contrast of the LED display to the change of the daylight illuminance, the image with dark and bright gradations during the day is processed brightly, increasing the contrast ratio, and not only the dark gradations at night, but also the bright gradation values. Implement high-quality images to improve the outdoor visibility of LED display boards that can always watch high-quality images by adaptively processing brightness, saturation, and gamma correction to improve visibility by increasing the contrast ratio while lowering the brightness of the image. Regarding the system, in an LED display consisting of a screen in which a digital image playback device such as a computer, a DVD player, etc., a video signal distribution device, a brightness and color control device, and LPM modules are combined, the screen to be displayed on the LED sign is displayed as a digital image. It converts the digital video signal into a signal, converts the digital video signal into a DVI/HDMI transmission signal, and transmits it to a video signal distribution device, and sets the screen size and position of the LED display board, controls the screen division, ON/Off, schedules operating hours, A digital image reproducing apparatus that performs an image schedule function such as determining a display order of an image, and functions such as contrast, gamma correction, brightness, and saturation adjustment; A DVI/HDMI receiver receiving the DVI/HDMI transmission signal TMDS signal, a dimming controller, an image and dimming data processing device, a timing and video control signal generator, and converting the dimming data and image data into a DVI/HDMI signal TMDS signal. A digital video signal distribution device comprising a repeater for transmitting to a brightness and color control device of a plurality of LED display boards using a DVI, HDMI, UTP cable, or the like; A repeater capable of receiving TMDS signals, which are DVI/HDMI signals transmitted using cables such as DVI, HDMI, UTP, etc., and transmitting the signals to other brightness and color control devices connected to the next stage, and clock signals and video signals. Timing and LPM module signal generator for converting data signals, image control signals, and dimming data signals, R, G, B memory devices in one FPGA, and perform operations to convert 8-bit image data from 12 bits to 20 bits A color enhancement device that performs functions of brightness control, saturation enhancement, and gamma correction to improve image quality, and a bit conversion and color enhancement processing unit that generates a control signal to control these devices. Brightness and color control device and shift clock signal, output enable signal, strobe that meet the standard of the LPM module so that the 12-bit to 20-bit image data generated by performing the brightness increase, decrease, and color enhancement can be transmitted to the LPM module. It characterized in that it comprises a control signal, such as a signal, a scan line selection signal and the role of transmitting to the LPM module, and the control signal is synchronized with the control signal to generate and transmit R, G, B image data to be displayed and transmits.