Holographic brightness enhancement film
First Claim
1. A display device, comprising:
- an array of display elements; and
a holographic film overlying the display elements, the holographic film comprising a pixilated hologram,wherein the hologram is configured to turn ambient light incident on the holographic film towards the array of display elements such that the turned light is reflected and propagates away from the display device at angles within a view cone of the display device, wherein a range of light that the hologram is configured to turn consists of light incident on the holographic film at angles outside of the view cone of the display device, wherein some pluralities of pixels of the hologram are configured to turn light incident on the hologram from a first direction without turning incident light from a second direction and wherein other pluralities of pixels of the hologram are configured to turn light incident on the hologram from the second direction without turning incident light from the first direction.
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Accused Products
Abstract
This disclosure provides systems, methods and apparatus, including a display device that includes an overlying holographic film. In one aspect, the holographic film includes a hologram that is configured to turn light incident on the film. The light is turned towards the display device at desired angles. The display can be formed of interferometric modulators and the turned light can be reflected off the display, and towards a viewer, to form an image. For light that is incident on the film at angles outside of a view cone, the holographic film is provided with holographic light turning features that turn this light so that it is reflected off the display at angles within a view cone of the display.
579 Citations
31 Claims
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1. A display device, comprising:
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an array of display elements; and a holographic film overlying the display elements, the holographic film comprising a pixilated hologram, wherein the hologram is configured to turn ambient light incident on the holographic film towards the array of display elements such that the turned light is reflected and propagates away from the display device at angles within a view cone of the display device, wherein a range of light that the hologram is configured to turn consists of light incident on the holographic film at angles outside of the view cone of the display device, wherein some pluralities of pixels of the hologram are configured to turn light incident on the hologram from a first direction without turning incident light from a second direction and wherein other pluralities of pixels of the hologram are configured to turn light incident on the hologram from the second direction without turning incident light from the first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A display device, comprising:
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a first means for reflecting incident light outward from an image-displaying side of the display system to form a displayed image; and a second means for selectively turning light depending on the location of incidence of the light on the display device, wherein the second means turns the light towards the first means such that the turned light is reflected from the first means and the reflected turned light propagates away from the display device at angles within a view cone of the display device, wherein a range of light that the second means is configured to turn consists of light incident on the second means at angles outside of the view cone of the display device, the second means comprising a pixilated hologram, wherein some pluralities of pixels of the hologram are configured to turn light incident on the hologram from a first direction without turning incident light from a second direction and wherein other pluralities of pixels of the hologram are configured to turn light incident on the hologram from the second direction without turning incident light from the first direction. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method for manufacturing a display device, comprising:
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providing a display having a reflective layer; and providing a holographic film on the display, the holographic film including a pixilated hologram configured to turn light incident on the display device towards the reflective layer such that the turned light is reflected off the reflective layer and the reflected turned light propagates away from the display device at angles within a view cone, wherein a range of light that the hologram is configured to turn consists of light incident on the holographic film at angles outside of the view cone, wherein some pluralities of pixels of the hologram are configured to turn light incident on the hologram from a first direction without turning incident light from a second direction and wherein other pluralities of pixels of the hologram are configured to turn light incident on the hologram from the second direction without turning incident light from the first direction. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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Specification