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US 12,736,810 B2Granted
Light guide and display device including a holographic optical element
AssigneePanasonic Automotive Systems Co., Ltd.
InventorsKen'ichi Kasazumi, Kosuke Imawaka, Keiji Sugiyama
Life of this patent
Estimating the term…
Abstract
A light guide includes: a holographic optical element that receives image light emitted from an image light emitter; and a light guide member that includes the holographic optical element. In an intensity distribution of the image light diffracted by and emitted from the holographic optical element, intensity is smaller in an end portion of the intensity distribution than in an intermediate portion of the intensity distribution.
Claims9
A light guide comprising:
- a holographic optical element that receives image light emitted from an image light emitter;
- and
- a light guide member that includes the holographic optical element, wherein
- in an intensity distribution of the image light diffracted by and emitted from the holographic optical element, intensity is smaller in an end portion of the intensity distribution than in an intermediate portion of the intensity distribution,
- the holographic optical element includes:
- a first holographic optical element that receives the image light;
- and a second holographic optical element that receives the image light,
- an intensity distribution of the image light diffracted by and emitted from the first holographic optical element is different from an intensity distribution of image light diffracted by and emitted from the second holographic optical element,
- the first holographic optical element and the second holographic optical element are any two of the following holographic optical elements:
- a light-entering holographic optical element that receives the image light;
- a turning holographic optical element that receives the image light emitted from the light-entering holographic optical element;
- and a light-emitting holographic optical element that receives the image light emitted from the turning holographic optical element,
- an intensity distribution of the image light diffracted by and emitted from the light-entering holographic optical element includes a first intermediate portion and a pair of first end portions that are located on opposite sides of the first intermediate portion,
- the first intermediate portion and the pair of first end portions are arranged in a first direction that is parallel to a direction in which the image light emitted propagates through the light guide member, and
- in the intensity distribution of the image light diffracted by and emitted from the light-entering holographic optical element, intensity is smaller in the pair of first end portions of the intensity distribution than in the first intermediate portion of the intensity distribution.
12 more elements
A display device comprising:
- a holographic optical element that receives image light emitted from an image light emitter;
- a light guide member that includes the holographic optical element, wherein, in an intensity distribution of the image light diffracted by and emitted from the holographic optical element, intensity is smaller in an end portion of the intensity distribution than in an intermediate portion of the intensity distribution;
- and
- the image light emitter that outputs the image light to the light guide,
- wherein the image light emitter emits the image light whose intensity distribution has a trapezoidal shape, a triangular shape, or a semicircular shape according to a distribution of diffraction efficiency of the holographic optical element.
2 more elements
Dependencies are inferred from the claim text.