Hitachi, Ltd.

Hiroshi Oshima

Takuya Shimizu

Satoshi Nakayama

Mikio Shiraishi

Kazuo Shikita

Futoshi Yamasaki

Tatsumi Hasebe

Fusamitsu Tsubata

Yoshimasa Takeuchi

Michiyuki Yoshino

If a projection display device includes a shifting mechanism for shifting a projection lens to adjust the direction in which the display projects an optical image, it is difficult to find suitable position where the display should be installed. Thus, the projection lens is fitted with a projection angle adjusting mechanism, which includes an adjusting dial having a scale representing the position of the lens relative to a display element. The projection display device is capable of automatically displaying on the projected optical image a scale image corresponding to the scale. The projection display also is capable of displaying on the projected optical image the position of the optical axis of the projection lens, which can be shifted by the adjusting mechanism.

Projection display

A projection type image display device superior in reliability and also superior in both repairability and maintainability is to be provided at a low cost. Support members disposed between liquid crystal panels and a prism are made of a thermoplastic polymer material, and the liquid crystal panels and the support members are fixed to each other by heat-fusion of the support members. When it is necessary to remove a liquid crystal panel which is at fault for example from the corresponding support member, the fused portion on the support member side which less expensive is cut off, thereby permitting the liquid crystal panel which is expensive to be taken out re-utilizably without any damage thereto.

Projection type image display device

Growing community of inventors

Fujisawa, Japan

Hiroshi Oshima