US5398081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for projecting colored images
Assignee: Raychem Corp
•
Filing: 1993-06-07
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Granted: 1995-03-14
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Expires: 2013-06-07
Abstract
Abstract A color projection display uses a dichroic cube for modulating the color of light reaching the imaging element of the display. This way, a colored image may be projected by frame sequential technique, but with the use of only a single imaging element.
Inventors
- 👤 Philip J. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:41
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/14; G02B27/149; G02B27/145; H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
288 words
An apparatus for projecting a colored image onto a screen, comprising: light source means for generating white light; image cell means on which an image to be displayed may be formed, which image cell means imparts an image to be displayed to light reaching the image cell means from the light source means; color modulator means for modulating the color of the light reaching the image cell means from the light source means, the color modulator means being optically positioned between the image cell means and the light source means and comprising a dichroic cube for separating white light from the light source means into plural component colored light beams and light valve means for controlling which of the plural component light beams exits the color modulator means and reaches the image cell means; controller means for controlling the image formed on the image cell means and the color of the light exiting the color modulator means, the controller means synchronizing the formation of images on the image cell means and the modulation of light color by the color modulator means such that the color of the light reaching the image cell means at a particular time corresponds to the color of the image formed on the image cell means at that particular time; and projection lens for projecting imaged light from the image cell means onto a screen; wherein the light valve means comprises reflector means associated with each colored light beam, each reflector means being independently controllably reflective or non-reflective, to affect whether each respective component colored light beam is reflected or not by the reflector means and forms part of the exiting light beam, thereby determining the color of the light exiting the dichroic cube.
Claim 2
Independent Claim
288 words
An apparatus for projecting a colored image onto a screen, comprising: light source means for generating white light; image cell means on which an image to be displayed may be formed, which image cell means imparts an image to be displayed to light reaching the image cell means from the light source means; color modulator means for modulating the color of the light reaching the image cell means from the light source means, the color modulator means being optically positioned between the image cell means and the light source means and comprising a dichroic cube for separating white light from the light source means into plural component colored light beams and light valve means for controlling which of the plural component light beams exits the color modulator means and reaches the image cell means; controller means for controlling the image formed on the image cell means and the color of the light exiting the color modulator means, the controller means synchronizing the formation of images on the image cell means and the modulation of light color by the color modulator means such that the color of the light reaching the image cell means at a particular time corresponds to the color of the image formed on the image cell means at that particular time; and projection lens for projecting imaged light from the image cell means onto a screen; wherein the light valve means comprises reflector means associated with each colored light beam, each reflector means being independently controllably reflective or non-reflective, to affect whether each respective component colored light beam is reflected or not by the reflector means and forms part of the exiting light beam, thereby determining the color of the light exiting the dichroic cube.
Claim 3
Dependent Claim
17 words
An apparatus according to claim 1, wherein the image cell means is a reflective image cell means.
Claim 4
Dependent Claim
17 words
An apparatus according to claim 1, wherein the image cell means is a transmissive image cell means.
Claim 5
Dependent Claim
31 words
An apparatus according to claim 1, further comprising prism means positioned in front of the dichroic cube for increasing the divergence between the light entering and exiting the dichroic cube means.
Claim 6
Dependent Claim
28 words
An apparatus according to claim 1, further comprising a focusing means for focusing light entering the dichroic cube to a disk of least diameter at the reflector means.
Claim 7
Dependent Claim
22 words
An apparatus according to claim 1, wherein the reflector means comprises encapsulated liquid crystal material and a reflective surface means positioned therebehind.
Claim 8
Dependent Claim
17 words
An apparatus according to claim 7, wherein the image cell means is a reflective image cell means.
Claim 9
Dependent Claim
17 words
An apparatus according to claim 6, wherein the image cell means is a transmissive image cell means.
Claim 10
Dependent Claim
103 words
An apparatus according to claim 1, wherein the image cell means is divided into a plurality of segments on each of which a portion of an image may be independently formed and each reflector means is divided into a plurality of segments, each of which may be independently controlled to be reflective or non-reflective, and is associated with a segment of the image cell means; the controller means synchronizing the reflectivity of each segment of the reflector means to correspond to the presence or not of image information on the associated segment of the image cell means and the color of that image.
Claim 11
Dependent Claim
17 words
An apparatus according to claim 9, wherein the image cell means is a reflective image cell means.
Claim 12
Dependent Claim
17 words
An apparatus according to claim 9, wherein the image cell means is a transmissive image cell means.
Claim 13
Dependent Claim
31 words
An apparatus according to claim 9, further comprising prism means positioned in front of the dichroic cube means for increasing the divergence between the light entering and exiting the dichroic cube.
Claim 14
Dependent Claim
28 words
An apparatus according to claim 9, further comprising a focussing means for focussing light entering the dichroic cube to a disk of least diameter at the reflector means.
Claim 15
Dependent Claim
22 words
An apparatus according to claim 9, wherein the reflector means comprises encapsulated liquid crystal material and a reflective surface means positioned therebehind.
Claim 16
Dependent Claim
17 words
An apparatus according to claim 14, wherein the image cell means is a reflective image cell means.
Claim 17
Dependent Claim
17 words
An apparatus according to claim 14, wherein the image cell means is a transmissive image cell means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-13 | 1998-09-12 | 1999-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-13 | 2002-09-12 | 2003-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-13 | 2006-09-12 | 2007-03-14 | $7700.00 | Window Closed / Lapsed |