Display apparatus
First Claim
Patent Images
1. A display apparatus comprising:
- a display;
a first diffraction grating for diffracting light emitted from said display, said first diffraction grating having a diffraction efficiency with a first wavelength spectrum and the diffracted light having a center wavelength; and
a second diffraction grating for diffracting diffracted light from said first diffraction grating toward a pupil of an observer, with a half-width of the first wavelength spectrum of said first diffraction grating being larger than a sum of a half-width of a second wavelength spectrum of a diffraction efficiency of said second diffraction grating and a variation amount of the center wavelength of the diffracted light directed toward the pupil, wherein the variation amount varies in accordance with variation of the position of the pupil.
1 Assignment
0 Petitions
Accused Products
Abstract
A display apparatus comprises a display, a first diffraction grating for diffracting light from the display, and a second diffraction grating for diffracting diffracted light from the first diffraction grating, so that a half-width of the first diffraction grating is set to be larger than that of the second diffraction grating.
-
Citations
33 Claims
-
1. A display apparatus comprising:
-
a display; a first diffraction grating for diffracting light emitted from said display, said first diffraction grating having a diffraction efficiency with a first wavelength spectrum and the diffracted light having a center wavelength; and a second diffraction grating for diffracting diffracted light from said first diffraction grating toward a pupil of an observer, with a half-width of the first wavelength spectrum of said first diffraction grating being larger than a sum of a half-width of a second wavelength spectrum of a diffraction efficiency of said second diffraction grating and a variation amount of the center wavelength of the diffracted light directed toward the pupil, wherein the variation amount varies in accordance with variation of the position of the pupil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A display apparatus comprising:
-
a display; a beam combiner having a diffraction grating for diffracting light emitted from said display toward a pupil; and diffracting means, arranged in an optical path between said display and said beam combiner and having a diffraction efficiency with a first wavelength spectrum, for directing the light from said display toward said beam combiner, wherein said diffracting means exhibits color dispersion opposite to that caused by said diffraction grating, and a half-width of the first wavelength spectrum of said diffracting means is larger than a sum of a half-width of a second wavelength spectrum of a diffraction efficiency of said diffraction grating and a variation amount of a center wavelength of the diffracted light directed toward the pupil, wherein the variation amount varies in accordance with variation of the position of the pupil. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A display apparatus comprising:
-
a display; a first diffraction grating having a smaller half-width of a wavelength spectrum of a diffraction efficiency than a wavelength spectrum of light emitted from said display, with said first diffraction grating diffracting light from said display toward a pupil; and a second diffraction grating for diffracting the light emitted from said display toward said first diffraction grating, said second diffraction grating having a larger half-width of the wavelength spectrum of a diffraction efficiency than a sum of a half-width of the wavelength spectrum of said first diffraction grating and a variation amount of a center wavelength of the light directed toward said pupil, wherein the variation amount varies in accordance with variation of the position of the pupil. - View Dependent Claims (17, 18, 19, 20, 21, 22)
-
-
23. A head-up display apparatus comprising:
-
a display; a beam combiner having a hologram for reflectively diffracting light from said display toward a pupil; and a diffraction grating, arranged in an optical path between said display and said beam combiner and having a diffraction efficiency with a first wavelength spectrum, for reflectively diffracting the light from said display toward said beam combiner, said diffraction grating having a larger half-width of the first wavelength spectrum of a diffraction efficiency than a sum of a half-width of a second wavelength spectrum of a diffraction efficiency of said hologram and a variation amount of a center wavelength of said light toward said pupil, wherein the variation amount varies in accordance with variation of the position of the pupil. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. A display apparatus for displaying an image on a front glass of a vehicle, comprising:
-
a display for emitting light; a first diffraction grating for diffracting light emitted from said display, with said first diffraction grating having a diffraction efficiency with a first wavelength spectrum and the diffracted light having a center wavelength; and a second diffraction grating for diffracting diffracted light from said first diffraction grating toward a pupil of a driver, said second diffraction grating toward a pupil of a driver, said second diffraction grating being arranged near the front glass, wherein a half-width of the first wavelength spectrum of said first diffraction grating is larger than a sum of a half-width of a second wavelength spectrum of a diffraction efficiency of said second diffraction grating and a variation amount of the center wavelength of said diffracted light toward the pupil, wherein the variation amount varies in accordance with variation of the position of the pupil.
-
Specification