US5552840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three dimensional projection display reflecting divided polarized light on to reflective liquid crystal display elements
Assignee: Sharp Corp
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Filing: 1993-03-11
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Granted: 1996-09-03
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Expires: 2013-03-11
Abstract
Abstract The present invention relates to a projection type liquid crystal display. In a preferred aspect, the projection type liquid crystal display of the invention includes an optical source for generating light, a light dividing unit which divides the light into a first light having a first polarization direction and a second polarization direction and allows the first and second lights to come out in different directions from each other, a pair of reflective liquid crystal display elements formed of a first reflective liquid crystal display element and a second reflective liquid crystal display element with synchronization, a light synthesizing unit for receiving the first light which comes out of the first reflective liquid crystal display element and the second light which comes out of the second reflective liquid crystal display element and synthesizing the first and second lights into image light, and a screen.
Inventors
- 👤 Yutaka Ishii
- 👤 Yoshitaka Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:14
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105; G; G02; G02B; G02B27/00; G02B27/28; G02B27/283; G02B30/00; G02B30/20; G02B30/22; G02B30/25; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/13362; H04N13/00; H04N13/30; H04N13/324; H04N13/332; H04N13/337; H04N13/363; H04N13/398; H04N13/10; H04N13/189; H04N13/20; H04N13/204; H04N13/239
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
247 words
A projection type liquid crystal display comprising: an optical source for generating light; a light dividing means which divides the light into a first light having a first polarization direction and a second light having a second polarization direction, and allows the first and second lights to come out in different directions from each other; a pair of reflective liquid crystal display elements formed of a first reflective liquid crystal display element and a second reflective liquid crystal display element, each of the pair of reflective liquid crystal display elements including a pair of substrates facing each other and liquid crystal sealed between the pair of substrates, the first reflective liquid crystal display element changing the first polarization direction of the first light by the liquid crystal sealed therein to allow the first light to come out thereof, and the second reflective liquid crystal display element changing the second polarization direction of the second light by the liquid crystal sealed therein to allow the second light to come out thereof; a driving means for driving the first reflective liquid crystal display element and the second reflective liquid crystal display element with synchronization; a light synthesizing means for receiving the first light which comes out of the first reflective liquid crystal display element and the second light which comes out of the second reflective liquid crystal display element, and synthesizing the first and second lights into image light; and a screen on which the image light is displayed.
Claim 2
Dependent Claim
247 words
A projection type liquid crystal display comprising: an optical source for generating light; a light dividing means which divides the light into a first light having a first polarization direction and a second light having a second polarization direction, and allows the first and second lights to come out in different directions from each other; a pair of reflective liquid crystal display elements formed of a first reflective liquid crystal display element and a second reflective liquid crystal display element, each of the pair of reflective liquid crystal display elements including a pair of substrates facing each other and liquid crystal sealed between the pair of substrates, the first reflective liquid crystal display element changing the first polarization direction of the first light by the liquid crystal sealed therein to allow the first light to come out thereof, and the second reflective liquid crystal display element changing the second polarization direction of the second light by the liquid crystal sealed therein to allow the second light to come out thereof; a driving means for driving the first reflective liquid crystal display element and the second reflective liquid crystal display element with synchronization; a light synthesizing means for receiving the first light which comes out of the first reflective liquid crystal display element and the second light which comes out of the second reflective liquid crystal display element, and synthesizing the first and second lights into image light; and a screen on which the image light is displayed.
Claim 3
Dependent Claim
22 words
A projection type liquid crystal display according to claim 1, wherein the light synthesizing means also functions as the light dividing means.
Claim 4
Dependent Claim
19 words
A projection type liquid crystal display according to claim 1, wherein the light dividing means is a beam splitter.
Claim 5
Dependent Claim
38 words
A projection type liquid crystal display according to claim 1, further comprising a light selection means for converting the light from the optical source into either one of a red light, a green light, and a blue light.
Claim 6
Dependent Claim
28 words
A projection type liquid crystal display according to claim 4, wherein the light selection means is formed of a cyan filter, a magenta filter, and a yellow filter.
Claim 7
Dependent Claim
41 words
A projection type liquid crystal display according to claim 5, wherein the cyan filter, the magenta filter, and the yellow filter have a pair of transparent substrates facing each other and liquid crystal sealed between the pair of transparent substrates, respectively.
Claim 8
Dependent Claim
21 words
A projection type liquid crystal display according to claim 4, wherein the light selection means is a mechanical R.G.B. rotary filter.
Claim 9
Dependent Claim
37 words
A projection type liquid crystal display according to claim 1, wherein the first liquid crystal display element and the second liquid crystal display element have a plurality of pixels and color filters formed on each pixel, respectively.
Claim 10
Dependent Claim
37 words
A projection type liquid crystal display according to claim 1, wherein at least one of the pair of substrates is a transparent substrate, and the first light or the second light are incident upon the transparent substrate.
Claim 11
Dependent Claim
70 words
A projection type liquid crystal display according to claim 9, wherein the pair of reflective liquid crystal display elements further have a reflection means and a non-reflection means, the reflection means is formed facing the transparent substrate and reflects the first light or the second light, and the non-reflection means is formed on the side of the transparent substrate upon which the first light or the second light is incident.
Claim 12
Dependent Claim
32 words
A projection type liquid crystal display according to claim 1, wherein one substrate of the pair of substrates is a silicon substrate, and the driving means is formed on the silicon substrate.
Claim 13
Dependent Claim
40 words
A projection type liquid crystal display according to claim 11, wherein the pair of reflective liquid crystal display elements have a plurality of pixels, respectively, and the driving means is formed on a back face of the plurality of pixels.
Claim 14
Dependent Claim
42 words
A projection type liquid crystal display according to claim 11, wherein the pair of reflective liquid crystal display elements have a display portion formed of the plurality of pixels and the driving means is formed in the periphery of the display portion.
Claim 15
Dependent Claim
32 words
A projection type liquid crystal display according to claim 1, wherein an angle formed by the first polarization direction and the second polarization direction is in the range of 45° to 135°.
Claim 16
Dependent Claim
59 words
A projection type liquid crystal display according to claim 1, wherein the first light having the first polarization direction is an S-polarized light, the second light having the second polarization direction is a P-polarized light, and the liquid crystal converts the S-polarized light into light having a P-polarized component and the P-polarized light into light having an S-polarized component.
Claim 17
Dependent Claim
44 words
A projection type liquid crystal display according to claim 4, wherein the light selection means is driven to selectively convert the light from the optical source into ones of the red light, the green light, and the blue light in a time divisional manner.
Claim 18
Dependent Claim
51 words
A projection type liquid crystal display according to claim 5, wherein the cyan filter, the magenta filter and the yellow filter are selectively driven to convert the light from the optical source into selected ones of the red light, the green light, and the blue light in a time divisional manner.
Claim 19
Dependent Claim
18 words
A projection type liquid crystal display according to claim 1, wherein the display can perform a non-three-dimensional display.
Claim 20
Dependent Claim
27 words
A projection type liquid crystal display according to claim 15, wherein the display can perform a non-three-dimensional display using both the P-polarized component and the S-polarized component.
Claim 21
Dependent Claim
26 words
A projection type liquid crystal display according to claim 1, wherein the display does not include a cathode ray tube in addition to the optical source.
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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) | 1999-09-03 | 2000-03-04 | 2000-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-03 | 2004-03-04 | 2004-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-03 | 2008-03-04 | 2008-09-03 | $7700.00 | Window Closed / Lapsed |