Liquid crystal display device

Abstract

Abstract PURPOSE:To obtain a liquid crystal display device high in contrast and visibility both at the time of turning on and off of an illumination device by arranging the illumination device on the front side of a liquid crystal display panel. CONSTITUTION:The illumination device 1 is arranged on the front side of a liquid crystal panel 2 and a reflector 3 is arranged on the back side of the panel 2. The illumination device 1 is provided with such functions as projecting a light beam on the panel 2 side and transmitting the light beam reflected on the reflector 3 almost without being dispersed. That means, when there is sufficient external light, the illumination device 1 is used in off-state, and in such a case, the illumination device 1 works as a simple transparent plate without deteriorating visibility nor affecting display quality. When the illumination device 1 is used in on-state at a dark place with in sufficient external light, the panel 2 is illuminated by the illumination device 1 and the light reflected on the reflector 3 is transmitted as it is because the illumination device 1 functions as the simple transparent plate in the same way as it is turned off. Therefore, the high visibility is held.

Inventors

• 👤 Tatsuaki Funamoto
• 👤 達昭 舟本
• 👤 Fumiaki Akaha
• 👤 史明 赤羽
• 👤 Toru Yagasaki
• 👤 透 矢ケ崎

Bibliographic Details