Image display apparatus and head mount display
First Claim
1. An image display apparatus comprising:
- an illumination optical system;
a reflective type display device for displaying an image by modulating illumination light from the illumination optical system; and
an eyepiece optical system for directing image light from the reflective type display device to a pupil of a viewer, the illumination optical system comprising;
a light source for emitting light; and
an optical-path bending member for bending an optical path leading from the light source to the reflective type display device, wherein the optical-path bending member is so arranged that a ray of light traveling from the light source to the optical-path bending member and a ray of light traveling further on a same optical path as said ray of light from the reflective type display device to the eyepiece optical system cross each other in a medium located outside the eyepiece optical system and having a substantially uniform index of refraction.
1 Assignment
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Accused Products
Abstract
The light directed from a light source to a concave mirror and the light directed from a display device to an eyepiece optical system are intersected by each other in a layout. This allows the light source, the concave mirror, and the display device to be arranged in compactness adjacent to the eyepiece optical system without increasing the optical power of an illumination optical system. As the result, the apparatus can easily be minimized in the thickness or the overall size. A hologram optical element is provided where the relationship between the wavelength range Δλ1 at half of the diffraction efficiency of each of the three primary colors of the light in the hologram optical element and the wavelength range Δλ2 at half of the intensity of each of the three primary colors of the light emitted from the light source is defined by Δλ1<Δλ2. Accordingly, a component at desired wavelengths of each of the R, G, and B colors of the light emitted from the light source can be diffracted by the action of the hologram optical element and then directed to the pupil of the viewer. This allows the image to be increased in the color reproduction area and improved in the quality regardless of the display device actuated in a time-division mode.
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Citations
53 Claims
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1. An image display apparatus comprising:
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an illumination optical system;
a reflective type display device for displaying an image by modulating illumination light from the illumination optical system; and
an eyepiece optical system for directing image light from the reflective type display device to a pupil of a viewer, the illumination optical system comprising;
a light source for emitting light; and
an optical-path bending member for bending an optical path leading from the light source to the reflective type display device, wherein the optical-path bending member is so arranged that a ray of light traveling from the light source to the optical-path bending member and a ray of light traveling further on a same optical path as said ray of light from the reflective type display device to the eyepiece optical system cross each other in a medium located outside the eyepiece optical system and having a substantially uniform index of refraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A head-mount display comprising:
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an image display apparatus; and
a supporting member for supporting the image display apparatus at the front of a viewer, the image display apparatus comprising;
an illumination optical system;
a reflective type display device for displaying an image by modulating illumination light from the illumination optical system; and
an eyepiece optical system for directing image light from the reflective type display device to a pupil of a viewer, the illumination optical system comprising;
a light source for emitting light; and
an optical-path bending member for bending an optical path leading from the light source to the reflective type display device, wherein the optical-path bending member is so arranged that a ray of light traveling from the light source to the optical-path bending member and a ray of light traveling further on a same optical path as said ray of light from the reflective type display device to the eyepiece optical system cross each other in a medium located outside the eyepiece optical system and having a substantially uniform index of refraction.
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34. An image display apparatus comprising:
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a light source for emitting a light at different wavelengths corresponding to the three primary colors;
a display device for displaying an image through modulating the light emitted from the light source at each pixel; and
an eyepiece optical system for directing the image received from the display device to the pupil of a viewer, wherein each pixel in the display device is driven in a time-division mode in response to each of the three primary colors of the light emitted in a time-division sequence from the light source, and the eyepiece optical system includes a hologram optical element for diffracting the light at difference wavelengths corresponding to the three primary colors emitted from the light source, and when the wavelength range at half of the diffraction efficiency of each of the three primary colors of the light in the hologram optical element and the wavelength range at half of the intensity of each of the three primary colors of the light emitted from the light source are Δ
λ
1 and Δ
λ
2 respectively, a relation of Δ
λ
1<
Δ
λ
2 is established for each of the three primary color. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. A head-mount display comprising:
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an image display apparatus; and
a supporting member for supporting the image display apparatus at the front of a viewer, wherein the image display apparatus includes;
a light source for emitting a light at different wavelengths corresponding to the three primary colors;
a display device for displaying an image through modulating the light emitted from the light source at each pixel; and
an eyepiece optical system for directing the image received from the display device to the pupil of a viewer, each pixel in the display device is driven in a time-division mode in response to each of the three primary colors of the light emitted in a time-division sequence from the light source, the eyepiece optical system includes a hologram optical element for diffracting the light at difference wavelengths corresponding to the three primary colors emitted from the light source, and when the wavelength range at half of the diffraction efficiency of each of the three primary colors of the light in the hologram optical element and the wavelength range at half of the intensity of each of the three primary colors of the light emitted from the light source are Δ
λ
1 and Δ
λ
2 respectively, a relation of Δ
λ
1<
Δ
λ
2 is established for each of the three primary color.
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Specification