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US 12,345,890 B2Granted
Virtual image display device
AssigneeSeiko Epson Corporation
InventorMitsutaka Ide
Life of this patent
Estimating the term…
Abstract
A virtual image display device includes a display element, which is an image light generating unit that generates an image light, a first mirror that reflects the image light, a second mirror that reflects the image light reflected by the first mirror, and a third mirror that transmits external light and that reflects part of the image light reflected by the second mirror to guide the image light to a position of an exit pupil, wherein the first mirror has an angular dependence on a reflective surface.
Claims15
A virtual image display device comprising:
- an image light generating unit that generates an image light;
- a first mirror that reflects the image light;
- a second mirror that reflects the image light reflected by the first mirror;
- and
- a third mirror that transmits an external light
- and that reflects, toward a position of an exit pupil, part of the image light reflected by the second mirror, wherein
- the first mirror has a reflective film reflecting the image light, and a light absorption film being provided on a surface opposite to a surface with the reflective film,
- the reflective film of the first mirror has an angular dependence such that a reflectance of the first mirror varies depending on an angle of incidence of the image light reaching the first mirror from the light generator unit,
- the third mirror has an angle-dependent reflectance such that a reflectance with respect to light incident at an angle greater than 45° is higher than a reflectance with respect to light incident at an angle of 45° or less, and
- the light absorption film of the first mirror absorbs the external light passed thought the third mirror.
7 more elements
Dependencies are inferred from the claim text.