Application of Pi-cells in Time-Multiplexed Stereoscopic and Autostereoscopic Displays, Based on LCD Panels

摘要

We investigated Pi-cell based polarization switches regarding their applications in both glass type and autostereoscopic 3D displays, which employ LCD as an image panel. It is found that Pi-cell should be divided into the number of individually addressable segments to be capable of switching in synchronism with line-by-line image update in order to reduce time-mismatch crosstalk. We estimated the number of segments, sufficient to reduce local and average crosstalk to acceptable level. It is found experimentally that the displayed stereoscopic image has unequal brightness and crosstalk in the right and left channels. The asymmetry of stereoscopic image parameters is probably caused by the asymmetry of rise/fall time, inherent in Pi-cells. The improved driving method capable of symmetrizing the crosstalk and brightness is proposed. It is also shown that the response time acceleration technique (RTA), developed for the reduction of motion blur, is capable of canceling the dynamic crosstalk caused by slow response of LCD pixels.