Display efficiency optimization by color filtering
First Claim
1. A display system comprising:
- a display including a waveguide configured to output colors viewable by one or more human eyes as a colored image; and
an image generation unit optically coupled to the waveguide to provide the waveguide with image forming light rays that are then distributively reflected within and output by the waveguide, the image generation unit being configured to generate first light rays within a first waveband for a first color which first waveband is narrower than and used in place of a full spectral bandwidth perceivable by human eyes for the first color and to generate second light rays within a second waveband for a different second color perceivable by human eyes, the generated first and second being coupled through a shared optical input into the waveguide.
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Abstract
Technology is disclosed for optimizing a near-eye display using a waveguide. A first waveband for a first color narrower than the full spectral bandwidth for the first color and a second waveband for a second color adjacent to the first color in the visible spectrum are generated in image light of an image generation unit like a microdisplay. The first waveband and the second waveband are coupled into a same layer of a diffractive waveguide. An input grating of the same layer of the waveguide has a grating wavelength band approximately matching a waveband extensive with the first waveband and the second waveband. A converted green light emitting diode (LED) may be used for obtaining a first waveband centered around 515 nm in some examples. One of more of the wavebands may be obtained using filters, for example filters using dichroic mirrors, quantum dots or a combination of these.
55 Citations
20 Claims
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1. A display system comprising:
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a display including a waveguide configured to output colors viewable by one or more human eyes as a colored image; and an image generation unit optically coupled to the waveguide to provide the waveguide with image forming light rays that are then distributively reflected within and output by the waveguide, the image generation unit being configured to generate first light rays within a first waveband for a first color which first waveband is narrower than and used in place of a full spectral bandwidth perceivable by human eyes for the first color and to generate second light rays within a second waveband for a different second color perceivable by human eyes, the generated first and second being coupled through a shared optical input into the waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A near-eye display system comprising:
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a near-eye support structure; a near-eye display (NED) supported by the near-eye support structure, the near-eye display including a waveguide having a plurality of layers; the waveguide having a respective input grating for each respective one of the plurality of layers, and at least one of the layers having an input grating receptive to both of a first waveband for a first color, which first waveband is narrower than and used in place of a full spectral bandwidth perceivable by human eyes for the first color and to a second waveband for a different second color adjacent to the first color in a visible spectrum; and an image generation unit supported by the near-eye support structure and optically coupled to the waveguide to provide the waveguide with image forming light rays that are then distributively reflected within and output by the waveguide, the image generation unit being configured to generate first light rays within the first waveband for a first color in place of generating light rays in the full spectral bandwidth perceivable by human eyes for the first color and being configured to generate second light rays within the second waveband for the different second color perceivable by human eyes, the generated first and second light rays being coupled through a shared optical input into the waveguide. - View Dependent Claims (12, 13, 14, 15)
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16. A method of coupling optical imagery into an image displaying waveguide in a near-eye display (NED) system, the method comprising:
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generating image light of at least three colors for coupling into the waveguide of the near-eye display (NED) by an image generation unit mounted on a near-eye support structure of the near-eye display system, the image light including a first waveband for a first color narrower than and used in place of a full spectral bandwidth for the first color and a second waveband for a second color of the three colors adjacent to the first color in a visible spectrum; and optically coupling both of the first waveband and the second waveband from the image generation unit into an input grating of one layer of the waveguide such that the input image light is then distributively reflected within and output by the waveguide, the input grating having a grating wavelength band approximately matching a waveband extensive with the first waveband and the second waveband. - View Dependent Claims (17, 18, 19, 20)
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Specification