消除自由立体显示串扰的定向背光源设计

Design on the Directional Backlight of Crosstalk Eliminated Autostereoscopic Display

定向背光柱透镜光栅式多视点自由立体显示器的串扰和亮度均匀性问题是影响其广泛应用的主要因素之一.本文通过分析串扰产生的原因,根据偏轴光线的成像光学原理,推导出液晶显示屏光开关板列单元与柱透镜组成的偏轴光学系统的参数计算式.提出一种液晶显示屏光开关蝶形单元结构,设计了采用该蝶形单元的定向背光自由立体显示背光源模组.模拟仿真结果表明:所设计的定向背光自由立体显示背光源可消除自由立体显示的串扰;在视点平面90%观看区域的串扰度小于0.5%,光束10%峰值宽度的串扰面积比γ=0,光束90%峰值宽度比普通液晶单元结构的增大37%,改善了不同位置观看图像亮度变化大的问题.

The brightness uniformity and the crosstalk are the main factors which affect the applicability of the directional backlight lenticular-lens-based multiple autostereoscopic display. In this paper , by analyzing the causes of the generation of the crosstalk, according to the imaging optics principle of off-axis rays, the parameter calculating formula of the off-axis optical system which is consist of Liquid Crystal Display （LCD）panel column unit and cylindrical lens was derived. Then, a structure of butterfly- shaped LCD panel was proposed and used to design the module of the directional backlight autostereoscopic display. The simulation results show that, the directional backlight autostereoscopic 3D display backlight can eliminate the crosstalk. The crosstalk of the autostereoscopic display is less than 0. 5% for the 90% viewing area of the view plane, the 10% peak width of the beam crosstalk area ratio is 0. The 90% peak width of the light beam is 1.37 times larger than that of the common liquid crystal cell structure, and the problem on the brightness of the image in different positions is improved.