OPTICAL SYSTEM FOR VIRTUAL IMAGE DISPLAY DEVICE, VIRTUAL IMAGE DISPLAY DEVICE, AND HEAD-MOUNTED DISPLAY

To more effectively prevent ghost and flare.SOLUTION: An optical system for a virtual image display device includes: a light guide member that guides image light from an image display element that displays an image; a partial reflection unit that reflects part of the image light guided inside the li...

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Hauptverfasser: TSUTSUI TAKEMASA, SUDO YOSHIFUMI
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To more effectively prevent ghost and flare.SOLUTION: An optical system for a virtual image display device includes: a light guide member that guides image light from an image display element that displays an image; a partial reflection unit that reflects part of the image light guided inside the light guide member and emits the part of the image light to the outside from an emission surface of the light guide member; and a polarization unit that is arranged on an outside surface of the light guide member located on an opposite side of the emission surface. In the polarization unit, relative to vertical incident light incident vertically on the polarization unit, transmittance of first polarized light is higher than the transmittance of second polarized light having a polarization direction orthogonal to that of the first polarized light. In the partial reflection unit, relative to the vertical incident light, reflectance of the first polarized light is lower than the reflectance of the second polarized light.SELECTED DRAWING: Figure 2 【課題】ゴーストやフレア等をより効果的に抑制すること。【解決手段】虚像表示装置用光学系は、画像を表示する画像表示素子からの画像光を導光する導光部材と、導光部材内を導光される画像光の一部を反射して導光部材の射出面から外部へ射出させる部分反射部と、射出面と反対側に位置する導光部材の外側面に配置された偏光部と、を含む。偏光部は、偏光部に垂直に入射される垂直入射光に対し、第1偏光の透過率が、第1偏光と偏光方向が直交する第2偏光の透過率よりも高い。部分反射部は、垂直入射光に対し、第1偏光の反射率が第2偏光の反射率より低い。【選択図】図2