PULSE WIDTH MODULATED DISPLAY WITH EQUALIZED PULSE WIDTH SEGMENTS

• Main Author: WILLIS DONALD H
• Format: Patent
• Language: English; Japanese
• Published: 04.12.2014
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CRYPTOGRAPHY; DISPLAY; EDUCATION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; SEALS

PROBLEM TO BE SOLVED: To provide a field sequential display system that reduces adverse effects on moving images attributable to light redistribution effects on intensity gradients.SOLUTION: A display system 10 comprises a DMD 24 having a plurality of micromirrors that reflect light toward a screen 28. A driver circuit 30 controls the DMD 24 in response to sequences of pulse width segments. A processor 31 alters the actuation state of at least one pulse in a first pulse width segment corresponding to a given color to alter pixel brightness in a range lying between first and second pixel brightness boundaries. Further, the processor alters the actuation state of at least one pulse within at least one additional pulse width segment to alter pixel brightness above the second brightness boundary to make nearly equal the total width of pulses becoming the actuation state within a segment and the total pulse width becoming the de-actuation state within the same segment to achieve an incremental change in brightness. 【課題】強度勾配の光再分配効果に起因する動画への悪影響を低減するフィールドシーケンシャル方式ディスプレイシステムを提供する。【解決手段】ディスプレイシステム１０は、光をスクリーン２８に向け反射させる複数の微小ミラーを持つＤＭＤ２４を有し、駆動回路３０はパルス幅セグメントのシーケンスに応答してＤＭＤ２４を制御し、プロセッサ３１は、所与の色に対応する第１パルス幅セグメントの少なくともひとつのパルスの作動状態を変えて第１ピクセル輝度境界と第２ピクセル輝度境界との間にある範囲内のピクセル輝度を変更し、さらに、少なくともひとつの追加パルス幅セグメント内にある少なくともひとつのパルスの作動状態を変えて、第２輝度境界より高いピクセル輝度を変更し、セグメント内の作動状態になるパルスの全体幅と、同一のセグメント内の非作動状態になるパルスの全体幅とをほぼ等しくして、輝度の漸進的変化を実現する。【選択図】図１