| As a new type of electronic paper display device,electrowetting displays have attracted more and more attention from universities and research institutions in various countries due to their advantages of fast response,high contrast,low power consumption and easy colorization.At present,the preparation technology of electrowetting display is not mature,and there are still some problems in the display panel,such as ink splitting,ink reflow,low gray level,and color space mismatch.These will cause low gray levels,gray level jumps,and color distortions in the displayed image.In order to reduce the impact of the above-mentioned problems on the display,this article has conducted an in-depth study on the image quality optimization technology of the electrowetting display drive system,and completed the following work around the purpose of improving the display quality of electrowetting electronic paper.Aiming at the photoelectric characteristics of electrowetting displays and the problems in the display process of image transmission across devices,this paper designs a video image display drive system dedicated to color electrowetting displays with a three-layer structure,and proposes a color correction method based on L~*(6~*(7~*color space.The HDMI video image coding and decoding system is mainly responsible for the collection,coding,decoding and communication of high-quality signal source data.The HDMI video image coding and decoding system is mainly responsible for the acquisition of high-quality signal sources,image coding and decoding,and data communication.The FPGA timing control system consists of three parts:a data buffer module,an image optimization module,and a timing control module:the data buffer module uses two SRAMs for ping-pong operation to buffer the image data transferred from the previous stage;the image optimization module uses a color correction algorithm based on L~*(6~*(7~*color space to convert the image from RGB color space to L~*(6~*(7~*color space,and then completes the conversion from L~*(6~*(7~*color space to CMY color space by improving the search method of tetrahedral interpolation;the timing control module is responsible for generating the timing and driving waveform required by the subsequent driver chip;the power module is responsible for providing the voltage required by the subsequent driver in accordance with the timing requirements of the driver chip.In order to optimize the design of the drive waveform,it is necessary to accurately measure the relationship between the aperture ratio and the drive voltage.For this reason,this paper proposes an improved Otsu electrowetting ink detection algorithm,which improves the measurement accuracy of the electrowetting panel aperture ratio,and provides an important basis for the waveform design of the drive system.The experimental results show that The developed color display driving system with a resolution of 1280×3×800 successfully drives a color electrowetting display with a resolution of 640×3×480,and realizes real-time video display.The frame rate reaches60 frames per second,the highest gray scale reaches 64 levels.At the same time,the system realizes the color space conversion from RGB to CMY.Compared with the traditional electrowetting drive system,the average brightness of the video image of this system is increased by 85.2%.Taking the L~*(6~*(7~*color gamut as the benchmark,the average color conversion error rate of the color image in the(6~*and(7~*directions of this system is respectively reduced by 7.8%and 5.8%,which better restores the color performance of the image. |
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