Mitsubishi Denki Kabushiki Kaisha

Masahisa Moroda

Akimasa Yuuki

Tomohiro Sasagawa

Kyoichiro Oda

Naoto Sugawara

Masahiro Yokoi

A compact and light weight front light, a reflective liquid crystal display device, and a personal digital assistant providing an image display of uniform brightness with high efficiency are provided. The front light includes a main optical guide plate and a second optical guide plate. The second optical guide plate is arranged at an end of the main optical guide plate along the widthwise direction, and, on an end surface opposite an end surface facing the main optical guide plate, grooves forming prisms are aligned along the longitudinal direction, extending in the depth direction. The front light further includes a point light source arranged at an end, in the longitudinal direction, of the second optical guide plate, and a reflective film covering the surfaces of the grooves.

Growing community of inventors

Tokyo, Japan

Masahisa Moroda