EP0363206A2
Expired / Lapsed
EP
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A method of and an apparatus for projecting a scanned two- or threedimensional modulated light pattern originating from a light source
Assignee: EMI Group Ltd
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Filing: 1989-10-05
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Granted: —
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Expires: 2009-10-05
Abstract
Abstract A scanned 2- or 3-D modulated light pattern originating from a light source and represented by a matrix of pixels is projected onto a defined surface or into a defined region distant from the light source. A plurality of means (88) for modulating light one operated between at least a first mode and a second mode. This operation is synchronised with the scanning of the matrix of pixels so that: a) respective modulating means (88) is in the first mode when its associated plurality of pixels are being scanned; and b) a respective plurality of pixels are not being scanned when its associated modulating means (88) is in the second mode. When a modulating means (88) is in the first mode, it allows light to be distributed from the defined surface or the defined region. When a modulating means (88) is in the second mode, it allows the effect produced by any light incident on the defined surface or in the defined region to be reduced.
Inventors
- 👤 Ian Alexander Shanks
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 16:13
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/74; H04N5/7416; H04N5/7441; G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
193 words
A method of projecting a scanned two- or three-dimensional modulated light pattern originating from a light source and represented by a matrix of pixels, the method comprising the steps of: projecting said pattern onto a defined surface or into a defined region distant from the light source; operating a plurality of means for modulating light between at least a first mode and a second mode, each of the modulating means being associated with a plurality of pixels; wherein the scanning of the matrix of pixels and the operation of said plurality of modulating means are synchronised so that a) a respective said modulating means is in said first mode when its associated plurality of pixels are being scanned and b) a respective plurality of pixels are not being scanned when its associated said modulating means is in said second mode; and each of said moduiating means in said first mode allows light to be distributed from said defined surface or said defined region and each of said modulating means in said second mode allows the effect produced by any light incident on said defined surface or in said defined region to be reduced.
Claim 2
Independent Claim
193 words
A method of projecting a scanned two- or three-dimensional modulated light pattern originating from a light source and represented by a matrix of pixels, the method comprising the steps of: projecting said pattern onto a defined surface or into a defined region distant from the light source; operating a plurality of means for modulating light between at least a first mode and a second mode, each of the modulating means being associated with a plurality of pixels; wherein the scanning of the matrix of pixels and the operation of said plurality of modulating means are synchronised so that a) a respective said modulating means is in said first mode when its associated plurality of pixels are being scanned and b) a respective plurality of pixels are not being scanned when its associated said modulating means is in said second mode; and each of said moduiating means in said first mode allows light to be distributed from said defined surface or said defined region and each of said modulating means in said second mode allows the effect produced by any light incident on said defined surface or in said defined region to be reduced.
Claim 3
Independent Claim
222 words
An apparatus for projecting a scanned two- or three-dimensional modulated light pattern originating from a light source and represented by a matrix of pixels, the apparatus comprising a light source; means for projecting a scanned two- or three-dimensional modulated light pattern from said light source onto a defined surface or into a defined region distant from the light source; a plurality of means for modulating light having at least a first mode and a second mode, each of the modulating means being associated with a plurality of pixels; means for operating each of said modulating means between said first and said second mode; and means for synchronizing the scanning of the matrix of pixels and the operation of said plurality of modulating means so that, in use, a) a respective said modulating means is in said first mode when its associated plurality of pixels are being scanned and b) a respective plurality of pixels are not being scanned when its associated said modulating means is in said second mode; wherein each of said modulating means in said first mode allows light to be distributed from said defined surface or said defined region and each of said modulating means in said second mode allows the effect produced by any light incident on said defined surface or in said defined region to be reduced.
Claim 4
Independent Claim
222 words
An apparatus for projecting a scanned two- or three-dimensional modulated light pattern originating from a light source and represented by a matrix of pixels, the apparatus comprising a light source; means for projecting a scanned two- or three-dimensional modulated light pattern from said light source onto a defined surface or into a defined region distant from the light source; a plurality of means for modulating light having at least a first mode and a second mode, each of the modulating means being associated with a plurality of pixels; means for operating each of said modulating means between said first and said second mode; and means for synchronizing the scanning of the matrix of pixels and the operation of said plurality of modulating means so that, in use, a) a respective said modulating means is in said first mode when its associated plurality of pixels are being scanned and b) a respective plurality of pixels are not being scanned when its associated said modulating means is in said second mode; wherein each of said modulating means in said first mode allows light to be distributed from said defined surface or said defined region and each of said modulating means in said second mode allows the effect produced by any light incident on said defined surface or in said defined region to be reduced.
Claim 5
Dependent Claim
25 words
An apparatus according to Claim 2 wherein each of said modulating means in said first mode forms a scattering screen to provide said defined surface.
Claim 6
Dependent Claim
18 words
An apparatus according to Claim 3 wherein said modulating means in said first mode forms a reflective screen.
Claim 7
Dependent Claim
25 words
An apparatus according to Claim 4 further comprising a layer on the other side of said plurality of modulating means from the matrix of pixels.
Claim 8
Dependent Claim
24 words
An apparatus according to Claim 5 wherein the layer is reflective when viewed from one direction and absorbing when viewed from the other direction.
Claim 9
Dependent Claim
17 words
An apparatus according to Claim 6 wherein the layer comprises a louvred panel and a reflective layer.
Claim 10
Dependent Claim
39 words
An apparatus according to Claim 2 further comprising a screen for distributing light to provide said defined surface, each of said modulating means forming an optical shutter, being transmissive in said first mode and non-transmissive in said second mode.
Claim 11
Independent Claim
23 words
An apparatus according to any one of Claims 1 to 8 wherein said modulating means is a layer containing a liquid crystal material.
Claim 12
Dependent Claim
21 words
An apparatus according to Claim 9 wherein said modulating means comprises a polymer film containing microdroplets of the liquid crystal material.
References Cited (Backward Citations)
No citation records indexed.
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