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US 5,475,512 AGranted
Head-up display and a combiner used to control diffraction of light including a hologram with a half width between 200-400 nm
AssigneeAsahi Glass Company, Limited
InventorsNorihito Nakazawa, Shoichi Takeuchi, Hiroaki Shimozono, Yuji Aizawa
Life of this patent
Estimating the term…
Abstract
A hed-up display comprises a light source and a liquid crystal display device for displaying an image, and a hologram arranged on a windshield glass of a vehicle to diffract the light to an observer, wherein the hologram has the half width of the diffraction spectrum so that a white light entering into the vehicle from the outside is diffracted as substantially a white light.
Claims11
A head-up display comprising:
- an information displaying source for generating information to be displayed by means of light, comprising at least a light source and a display device for displaying information to be displayed;
- and
- a combiner arranged in or on a windshield glass of a vehicle to diffract light to an observer, wherein the combiner comprises a hologram having a diffraction spectrum which has, as a central peak wavelength, a wavelength of light corresponding to a green color, and a half width between 200-400 nm, so that a white light entering into the vehicle from outside is diffracted as substantially a white light.
A combiner for a head-up display comprising:
- an information displaying source for generating information to be displayed by means of light, comprising at least a light source and a display device for displaying information to be displayed;
- and
- a combiner arranged in or on a windshield glass of a vehicle to diffract light to an observer, wherein the combiner comprises a hologram having a diffraction spectrum which has, as a central peak wavelength, a wavelength of light corresponding to a green color, and a half width between 200- 400 nm, so that a white light entering into the vehicle from outside is diffracted as substantially a white light.
A head-up display comprising:
- an information displaying source for generating information to be displayed by means of light, comprising at least a light source and a display device to display information to be displayed;
- and
- a combiner arranged in or on a windshield glass of a vehicle to diffract light to an observer, wherein the combiner comprises a hologram having a diffraction spectrum which has, as central peak wavelengths, wavelengths of light corresponding to blue, green and red colors, each having respective spectra with half widths greater than 80 nm which are superpositioned, so that a white light entering into the vehicle from outside is diffracted as substantially a white light.
Dependencies are inferred from the claim text.