Difractive device
First Claim
1. An achromatic diffractive diffuser device comprising a plurality of discrete regions of individual surface relief diffractive devices each of a size below the normal visual resolution of an observer and arranged such that, under illumination by ambient light, the superposition of the diffractive effects serves to provide a uniform achromatic diffuse reflection into a defined viewing zone for observation by an observer.
1 Assignment
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Accused Products
Abstract
The invention provides in particular for an achromatic diffractive diffuser comprising a surface relief diffractive device arranged such that, under illumination by ambient light, the diffractive effect serves to provide a uniform achromatic diffuser reflection into a defined viewing zone for observation by an observer, and also such that the achromatic diffractive replay of the device has a non-symmetric distribution of diffractive light intensity between positive and negative diffractive order such that the diffractive efficiency in the desired diffractive order is enhanced over that of the undesired order to provide an enhanced brightness achromatic device.
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Citations
117 Claims
- 1. An achromatic diffractive diffuser device comprising a plurality of discrete regions of individual surface relief diffractive devices each of a size below the normal visual resolution of an observer and arranged such that, under illumination by ambient light, the superposition of the diffractive effects serves to provide a uniform achromatic diffuse reflection into a defined viewing zone for observation by an observer.
- 2. An achromatic diffractive diffuser comprising a surface relief diffractive device arranged such that, under illumination by ambient light, the diffractive effect serves to provide a uniform achromatic diffuser reflection into a defined viewing zone for observation by an observer, and also such that the achromatic diffractive replay of the device has a non-symmetric distribution of diffractive light intensity between positive and negative diffractive order such that the diffractive efficiency in the desired diffractive order is enhanced over that of the undesired order to provide an enhanced brightness achromatic device.
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7. An achromatic diffractive diffuser comprising at least one region of individual surface relief diffractive devices of a size below the normal visual resolution of an observer and arranged such that, under illumination by ambient light, the superposition of the diffractive effects serves to provide a uniform achromatic diffuser reflection into a defined viewing zone for observation by an observer, and also such that the achromatic diffractive replay of the device has a non-symmetric distribution of diffractive light intensity between positive and negative diffractive orders such that the diffraction efficiency in the desired diffractive order is enhanced over that of the undesired order to provide an enhanced brightness achromatic devices.
- 46. A display device viewable by both transmission and reflection and comprising an image-providing display element including a spatial light modulator arranged to provide an image viewable by the transmission of light there through, and visible to an observer under ambient light by reflection of a holographic reflector and arranged to be visible in transmission via a back light, the holographic reflector having a plurality of light transmitting micro holes and further including plurality of micro lenses which serve to concentrate light through the micro holes.
- 52. A display device comprising an image-providing display element and a spatial light modulator, a back light arranged to deliver light by way of a light guide behind the modulator, including a diffractive or holographic device arranged to couple light out of a light guide and towards the modulator, to provide replay into a defined viewing zone.
- 62. An overlay arranged for compiling light into a reflective image providing display device comprising a surface relief diffractive structure combined with a high refractive index material or left exposed to air and arranged such that upon illumination by ambient light the superposition of diffractive effects serves to provide a reflection enhanced over that which would be expected from a conventional specular reflector or lambertian diffuser into a defined viewing zone for observation by an observer.
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91. A method of forming a reflective transmission holographic diffuser wherein a substrate that is to comprise the diffuser is orientated such that both the object and reference beams are arranged to be incident thereon at angles of greater than 10°
- to the normal and on the same side of the normal.
- View Dependent Claims (92, 93, 94)
- 101. A display device comprising a metal reflection layer offering an image visible by reflection by two or more colours and a substantially diffractive uniform brightness achieved from gain offered by a diffractive device
Specification