Virtual image display device
    4.
    发明授权

    公开(公告)号:US11226490B2

    公开(公告)日:2022-01-18

    申请号:US16953394

    申请日:2020-11-20

    Abstract: A virtual image display device presents a virtual image to a user via a virtual image presentation plate. The virtual image display device includes a display unit that generates an image display light; a concave mirror that reflects the image display light and projects the image display light toward the virtual image presentation plate; and a driving mechanism that changes an orientation of the concave mirror to change an incidence angle of the image display light on the concave mirror and change a distance a from the concave mirror to the display unit in accordance with the orientation of the concave mirror.

    Liquid crystal illumination device, head up display, and illumination method

    公开(公告)号:US10690963B2

    公开(公告)日:2020-06-23

    申请号:US16598943

    申请日:2019-10-10

    Abstract: The liquid crystal illumination device includes a light source projecting light to a liquid crystal panel, a first diffusion unit diffusing the projected light, a first light guide unit including a radially widened reflection surface and reflect the diffused light at the reflection surface, a reflecting mirror including an opening, part of the light guided by the first light guide unit being reflected and returned to inside the first light guide unit, and remaining light passing through the opening, a light collecting unit collecting light passing through an opening on the reflecting mirror, and a second diffusion unit diffusing the collected light toward the liquid crystal panel. The opening on the reflecting mirror is formed correspondingly to a display region where the liquid crystal panel display an image. A haze value of the first diffusion unit is set to a value higher than that of the second diffusion unit.

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