基于双层屏幕的防窥可切换显示技术

Research of dual cell switchable privacy display technology

开发了基于双层显示屏幕架构的防窥显示技术方案,可实现共享显示和防窥显示切换功能。本文首先对双层屏幕架构的光场显示模型进行分析,提取出双图像叠加算法的数据要求,给出双屏幕像素点空间对应及亮度随视角变换关系,再利用深度学习算法得出双层屏幕图像拆分结果,并进行仿真模拟评估防窥显示效果,最后搭建双层屏幕样机实测分析模型和仿真效果准确性,评价样机大视角防窥效果。通过计算和比较侧视角图像和原图像的差异,认为侧视角图像SSIM<0.2时有明显防窥效果,再利用实际样机进行可视角度实验,验证了防窥性与计算值基本相符。实验结果表明拆分图像叠加效果符合光场显示模型,在45°以上视角基本实现防窥显示。

A kind of privacy display solution is developed using dual cell stack up,which can achieved switchable function between share mode and privacy mode.First we build the lighting-field display model in theory by dual cell LCD device,then extract data require by dual image generate algorithm,so can get dual cell image by deep learning algorithm.Meanwhile we simulate to evaluate the privacy mode,and assemble the dual cell sample to verify the result.By calculating and comparing the difference between side view images and original image,the view angle can has obviously anti-peep effect if SSIM<0.2.The actual sample experiment is basically consistent with the above result.According to the experiment,can verify the dual cell image multiplication mode following the principle of lighting field theory.The view angle over 45°can get the chaos image and achieve privacy display condition.