EP0526067A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in or relating to displays
Assignee: Qioptiq Ltd
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Filing: 1992-07-20
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Granted: —
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Expires: 2012-07-20
Abstract
Abstract An optical system for a display having a combiner (1) with a non-conformal reflection hologram and in which an intermediate image (II) of a display source is formed at a location in the light path to and spaced from the combiner (1), the system comprising at least one diffractive element (5,7) disposed in the light path between the display source (2) and the intermediate image (II) and arranged to counter, at least partially, the chromatic dispersion of the non-conformal reflection hologram (1).
Inventors
- 👤 Martin David Roberts
- 👤 Anthony John Kirkham
- 👤 David Gordon Norrie
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 11:24
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/0101; G02B27/0103; G02B27/017; G02B27/0172; G02B5/00; G02B5/32; G02B2027/0105; G02B2027/0107; G02B2027/0112; G02B2027/0116; G02B2027/0132; G02B2027/0145
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
An optical system for a display having a combiner (1) with a non-conformal reflection hologram and in which an intermediate image (II) of a display source is formed at a location in the light path to and spaced from the combiner (1), the system comprising at least one diffractive element (5,7) disposed in the light path between the display source (2) and the intermediate image (II) and arranged to counter, at least partially, the chromatic dispersion of the non-conformal reflection hologram (1).
Claim 2
Dependent Claim
48 words
An optical system according to Claim 1 comprising two diffractive elements disposed in the light path between the display source and the intermediate image, wherein one of the two diffractive elements is arranged largely to counter lateral colour and the other is arranged largely to counter longitudinal colour.
Claim 3
Dependent Claim
40 words
An optical system according to Claim 2 in which said one diffractive element basically takes the form of a lined diffraction grating and is located towards the conjugate position of the non-conformal reflection hologram with respect to the intermediate image.
Claim 4
Dependent Claim
31 words
An optical system according to Claim 2 in which said other diffractive element basically takes the form of a circular diffraction grating and is located at or near a pupil position.
Claim 5
Dependent Claim
25 words
An optical system according to Claim 3 in which said other diffractive element takes the form of a surface relief hologram in a hydrid doublet.
Claim 6
Dependent Claim
20 words
An optical system according to Claim 2 in which the two diffractive elements are incorporated in a relay lens arrangement.
Claim 7
Dependent Claim
16 words
An optical system according to Claim 6 in which the relay lens arrangement incorporates a prism.
Claim 8
Dependent Claim
25 words
An optical system according to Claim 1 having a single diffractive element disposed in the light path between the display source and the intermediate image.
Claim 9
Dependent Claim
31 words
An optical system according to Claim 8 in which the single diffractive element is located at or near the conjugate position of the non-conformal hologram with respect to the intermediate image.
Claim 10
Dependent Claim
30 words
A display having an optical system according to claim 1, the display being mounted on a helmet having a visor which carries the non-conformal reflection hologram and constitutes the combiner.
References Cited (Backward Citations)
No citation records indexed.
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