[Paper] Design of VA-LCD System with Microstructure Film for Wide Viewing

Abstract

We have developed a wide viewing VA-LCD system with the microstructure film. This film is attached on LC panel and scatters incident lights from LC panel by reflection at internal air cavities to improve the viewing angle characteristics. In this system, we have optimized LC alignment directions and BL distribution as well as the scattering profile of the film. LC panel has two-domain LC aligned pixel (each LC director is antiparallel in vertical direction) and wide viewing angle in horizontal direction. Backlight distribution is collimated to horizontal direction. To distribute lights in horizontal direction to vertical direction, we designed and fabricated the microstructure film which had rhombus shaped air cavities. This display system indicated smaller color shift and higher CR at oblique angles than the conventional VA-LCD; the color shift from the normal direction (Δu'v') at θ= 60° was reduced by 60% and the CR was over 100:1 at all directions.