Title:
【発明の名称】ヘッドアップディスプレイ
Document Type and Number:
Japanese Patent JP3077092
Kind Code:
B2
Abstract:
PURPOSE:To economize power consumption without impairing visibility by forming such structure as to hold the fixed luminance without a polarizing plate being rotated in one stage range of background luminance divided into plural stages in a head up display for turning the polarizing plate to adjust display luminance. CONSTITUTION:A head up display H is provided with a polarizing transmission type display panel D1, a turnable polarizing plate E, and a display luminance adjusting means U for turning the polarizing plate E so as to increase/decrease display luminance. With this constitution, display luminance is changed only by turning the polarizing plate E so as to enable high speed adjustment. The display luminance adjusting means U is provided with a background luminance stage detecting means for detecting which range of 5-7 stages background luminance belongs to, and a stepping motor S for turning the polarizing plate E into a position corresponding to the background luminance of 5-7 stages. It is also so formed that the polarizing plate E is not turned within the specified stage range of background luminance even if the background luminance changes. Power can be thereby economized without impairing the visibility.
Inventors:
Isamu Tanaka
Hidefumi Saito
Yasuyuki Kinoshita
Shigeru Kitayama
Kazuhiko Kobayashi
Hidefumi Saito
Yasuyuki Kinoshita
Shigeru Kitayama
Kazuhiko Kobayashi
Application Number:
JP19237591A
Publication Date:
August 14, 2000
Filing Date:
July 31, 1991
Export Citation:
Assignee:
SHIMADZU CORPORATION
Tokai Passenger Railway Co., Ltd.
Tokai Passenger Railway Co., Ltd.
International Classes:
B61D37/00; B60K35/00; (IPC1-7): B60K35/00
Domestic Patent References:
| JP4325323A | ||||
| JP4229892A |
Attorney, Agent or Firm:
Takahide Tanaka (1 outside)