Micro-lighting Emitter Diode Control ChipDesign and Real-time Display System

• Main Authors: XIN-YAN JIANG, 江信諺
• Other Authors: Shih-Chang
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/s92x4n

碩士 === 國立雲林科技大學 === 電子工程系 === 107 === This paper proposes a control chip for micro-light emitting diode(μLED) display and real-time display system. The μLED control system divide into the transmitter and the LED display unit. The transmitter includes data receiving module, a memory management, an image format conversion. LED display unit employed the regional image scanning, memory management, PWM output controller, gamma correction for LED brightness calibration. In the data receiving module, the TPF 401 decoder is used to convert the HDMI signal of the graphics card into a TTL signal, which is transmitted to the FPGA. The image format conversion refers to bit plane for RGB pixels. Finally, the bit data is converted into a Serial Peripheral Interface (SPI) format for output. The BRAM (Block Memory) is used in the FPGA to increase the frame rate of the display, and also can avoid data conflict or loss. The area image scan technology use the memory management to make the display board use the lower frequency to achieve the high picture update rate, and to improve the stability of the display system. The data transmission is synchronized with the VGA scan line, and the display system contains the memory. When the transmitted image data is stored, and the image can be displayed even if the display image has not been received yet. The PWM output controller is used in the output of the LED to display the grayscale brightness to be displayed. The gray scale control for LED is displayed using the PWM method. In order to make the LED display panel have more linear on the naked eye, the gamma LED brightness calibration is used to improve the original brightness of the LED display panel. The LED display system drives a light-emitting diode module (123*66) with 12-bit (4096 grayscale) colors.