Superlens component for directional display
First Claim
1. A display device, comprising:
- a transmissive spatial light modulator comprising an array of pixels arranged to modulate light passing therethrough;
a waveguide having an input end, and first and second opposed guide surfaces for guiding light along the waveguide, the first and second opposed guide surfaces extending from the input end across the spatial light modulator, wherein the waveguide is arranged to output light through the first guide surface for supply through the spatial light modulator, the waveguide being arranged to direct input light from different input positions across the input end in output directions relative to the normal to the first guide surface that are dependent on said input position; and
an optical element disposed between the waveguide and the spatial light modulator, comprising first and second arrays of lenses, the lenses each having a positive optical power in respective first meridians and no optical power in respective second meridians perpendicular to the first meridians, the first and second arrays of lenses being arranged with respective focal planes that extend perpendicular to the normal to the spatial light modulator between the first and second arrays of lenses, the lenses of each array having parallel second meridians.
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Accused Products
Abstract
Disclosed is an imaging directional backlight apparatus comprising a waveguide, a light source array, and a further optical element for providing large area directed illumination from localized light sources. The imaging directional backlight may comprise a stepped waveguide that may include a stepped structure, in which the steps may further include extraction features optically hidden to guided light, propagating in a first forward direction. Returning light propagating in a second backward direction may be refracted, diffracted, or reflected by the features to provide discrete illumination beams exiting from the top surface of the waveguide. Viewing windows are formed through imaging individual light sources. The further optical element may comprise a superlens comprising first and second aligned lens arrays that may be arranged to modify the output viewing windows to achieve enhanced window imaging from the directional backlight.
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Citations
28 Claims
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1. A display device, comprising:
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a transmissive spatial light modulator comprising an array of pixels arranged to modulate light passing therethrough; a waveguide having an input end, and first and second opposed guide surfaces for guiding light along the waveguide, the first and second opposed guide surfaces extending from the input end across the spatial light modulator, wherein the waveguide is arranged to output light through the first guide surface for supply through the spatial light modulator, the waveguide being arranged to direct input light from different input positions across the input end in output directions relative to the normal to the first guide surface that are dependent on said input position; and an optical element disposed between the waveguide and the spatial light modulator, comprising first and second arrays of lenses, the lenses each having a positive optical power in respective first meridians and no optical power in respective second meridians perpendicular to the first meridians, the first and second arrays of lenses being arranged with respective focal planes that extend perpendicular to the normal to the spatial light modulator between the first and second arrays of lenses, the lenses of each array having parallel second meridians. - 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)
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25. A display apparatus, comprising:
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a transmissive spatial light modulator comprising an array of pixels arranged to modulate light passing therethrough; a waveguide having an input end, and first and second opposed guide surfaces for guiding, light along the waveguide, the first and second opposed guide surfaces extending from the input end across the spatial light modulator, wherein the waveguide is arranged to output light through the first guide surface for supply through the spatial light modulator, the waveguide being arranged to direct input light from different input positions across the input end in output directions relative to the normal to the first guide surface that are dependent on said input position; an optical element disposed between the waveguide and the spatial light modulator, comprising, first and second arrays of lenses, the lenses each having a positive optical power in respective first meridians and no optical power in respective second meridians perpendicular to the first meridians, the first and second arrays of lenses being arranged with respective focal planes that extend perpendicular to the normal to the spatial light modulator between the first and second arrays of lenses, the lenses of each array having parallel second meridians; an array of light sources at different input positions across the input end of the waveguide; and a control system arranged to selectively operate the light sources to direct light into viewing windows corresponding to said output directions; wherein the control system is arranged to control the light sources so that, when light is directed from a given light source into a given viewing window, in the event that the light from the given light source is directed into a viewing window other than the given viewing window by splitting through different lenses of the second array, a further, separated light source is operated to direct compensatory light into the given viewing window. - View Dependent Claims (26, 27, 28)
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Specification