高灰阶硅基OLED微显示器的递归扫描算法

Recursive scanning algorithm for high-gray micro OLED display on silicon

硅基微显示器正向着高灰度、高帧率方向发展,而传统的扫描算法存在时间冗余问题。通过对数字脉宽调制扫描算法、灰度权值扫描算法及子场扫描算法进行研究,对微显示的扫描进行分析,建立了一种递归扫描模型,并推导出递归扫描算法在任意比特位的扫描结构。通过数学模型将扫描过程抽象为矩阵的形式,其原理是将整个显示空间分为多个子空间,充分利用数据传输过程中的等待时间使传输效率达到100%。经现场可编程逻辑门阵列(field programmable gate array,FPGA)硬件平台验证,在时钟频率50 MHz、256级灰阶下采用递归扫描算法可使转换效率达到100%,同时帧率可达85 Hz,基本可以满足高灰阶微显示器中帧率和灰度高、时钟频率低的要求。该扫描算法不仅可以运用在微显示器的图像数据传输,也可以运用在平板、大屏显示等领域。

While the traditional scanning algorithm has the problem of time redundancy,the new development in silicon-based micro display shows a tendency for high gray and high frame rate.Through the research of digital pulse width modulation(PWM)scanning algorithm,weight scan algorithm and subfield scanning algorithm,a recursive scanning model is established and the scanning structure of the recursive scanning algorithm in any bit is deduced.The scanning process is abstracted into matrix form by mathematical model,the principle is to divide the whole display space into many sub spaces,and make full use of the waiting time in the data transmission process,so that the transmission efficiency can reach 100%.It is verified by FPGA hardware platform that the recursive scanning algorithm can make the conversion efficiency reach 100%and the frame rate can reach 85 Hz at the clock frequency 50 MHz and 256 gray scale.It can mainly meet the requirement of high frame rate,high gray scale and low clock frequency in high gray level micro display.The scanning algorithm can not only be applied to the image data transmission of the micro display,but also can be utilized in the flat panel,large screen display and other fields.