PROBLEM TO BE SOLVED: To provide a projection type display device which maintains visibility of information for a driver even when ambient brightness of a vehicle varies and which does not obstruct a view field without requiring special wiring.SOLUTION: A projection type display device 10 includes: a projection unit 100 having a light source 110 that emits first light 120; a combiner 200 constituted by stacking a half mirror 210 that reflects a part of the first light 120 emitted from the projection unit 100 to generate reflected light 130, and a liquid crystal shutter 230 that transmits second light 500 coming in the opposite direction to the incident direction of the first light 120; a photo-electric conversion element 300 that generates electromotive force having a magnitude depending on the intensity of the second light 500; and a control part 400 that controls the intensity of the first light 120 on the basis of the magnitude of the electromotive force. In the projection display device 10, the liquid crystal shutter 230 is actuated by the electromotive force of the photo-electric conversion element 300, and the transmittance of the liquid crystal shutter 230 varies depending on the magnitude of the electromotive force.SELECTED DRAWING: Figure 2

    【課題】特別な配線が不要で、車両周囲の明るさが変化しても、運転者による情報の視認性が維持され、視野が遮られない投射型表示装置を提供する。【解決手段】投射型表示装置10は、第1の光120を出射する光源110を有する投射ユニット100と、投射ユニット100から出射された第1の光120の一部を反射して反射光130を生成するハーフミラー210及び第1の光120の入射方向とは反対方向から入射した第2の光500を透過させる液晶シャッタ230を積層して構成されたコンバイナ200と、第2の光500の強度に応じた大きさの起電力を発生する光電変換素子300と、該起電力の大きさに基づいて第1の光120の強度を制御する制御部400と、を備える。投射型表示装置10において、液晶シャッタ230は光電変換素子300の起電力により作動し、液晶シャッタ230の透過率は起電力の大きさに応じて変化する。【選択図】図2


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    Title :

    PROJECTION TYPE DISPLAY DEVICE AND ON-VEHICLE HEAD-UP DISPLAY USING THE PROJECTION TYPE DISPLAY DEVICE


    Additional title:

    投射型表示装置及び該投射型表示装置を用いた車載用ヘッドアップディスプレイ


    Contributors:

    Publication date :

    2017-01-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / G02F DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING,... , Vorrichtungen oder Anordnungen, deren optische Arbeitsweise durch Änderung der optischen Eigenschaften des Mediums der Vorrichtungen oder Anordnungen geändert wird zum Steuern der Intensität, Farbe, Phase, Polarisation oder der Richtung von...



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