55.2: Reduction of Light Leakage by Optical Compensation Film in VA‐LCDs

Abstract

We investigated a light leakage at normal incidence of a vertically aligned liquid crystal display (VA-LCD) at black state. The light leakage was strongly affected by the polarization states of light obliquely incident on the cell. Experimental results were explained by a light scattering model of substrates on both sides of liquid crystal layer. Applying this result, we showed the light leakage can be highly reduced by controlling the retardation value of optical compensation film between the cell and a backlight unit.

A novel quarter‐wave retardation film for improving viewing angle properties in time‐sequential stereoscopic 3D‐LCDs

“…To make the QWFs whose Rth was 0 nm, we investigated two methods of fabrication: a stretch process and a coating process. Using these methods, we have developed various compensation films with a wide range of retardation values required for various modes of the LCDs, such as twisted nematic, optically compensated bend (OCB), vertical alignment, and in-plane switching [8][9][10][11][12][13][14] . Although a stretch process easily made QWFs, it was quite difficult to develop QWFs whose Rth was 0 nm by this stretch process.…”