LUMINAIRE AND DISPLAY UNIT

• Main Author: AKIBA AKIRA
• Format: Patent
• Language: English; Japanese
• Published: 16.04.2020
• Subjects: ACCESSORIES THEREFOR; ADVERTISING; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; BLASTING; CINEMATOGRAPHY; CRYPTOGRAPHY; DISPLAY; EDUCATION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; HOLOGRAPHY; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; SEALS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

To enhance gradation expression in generating an image in a PWM manner.SOLUTION: A luminaire according to the present disclosure comprises: an illumination optical system which has a first variable stop and a second variables top in the order of incidence of light from a light source, and generates, based upon the light from the light source, illumination light to be used to generate an image in a pulse width modulation manner; a luminance calculation part which calculates average luminance of at least every frame of the image signal; a gradation evaluating computation part which evaluates a gradation value in a screen in every display period of at least unit gradation bits; a first opening diameter decision part which decides, based upon the average luminance calculated by the luminance calculation part, an opening diameter of a first variable stop; and a second opening diameter decision part which decides, based upon evaluation of the gradation evaluation arithmetic part, an opening diameter of the second variable stop.SELECTED DRAWING: Figure 1 【課題】ＰＷＭ方式による画像の生成を行う際の階調表現を向上させることを可能にする。【解決手段】本開示の照明装置は、光源からの光が入射する順に、第１の可変絞りおよび第２の可変絞りを有し、光源からの光に基づいて、パルス幅変調方式による画像の生成に用いられる照明光を生成する照明光学系と、画像信号における少なくとも１フレームごとの平均輝度を算出する輝度算出部と、少なくとも単位階調ビットの表示期間ごとに画面内の階調値を評価する階調評価演算部と、輝度算出部によって算出された平均輝度に基づいて、第１の可変絞りの開口径を決定する第１の開口径決定部と、階調評価演算部による評価に基づいて、第２の可変絞りの開口径を決定する第２の開口径決定部とを備える。【選択図】図１