Patent US3490872A successfully refreshed from Google Patents.
Patent US5666174A successfully refreshed from Google Patents.
US5666174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emissive liquid crystal display with liquid crystal between radiation source and phosphor layer
Assignee: Innolux Corp
•
Filing: 1996-02-15
•
Granted: 1997-09-09
•
Expires: 2016-02-15
Abstract
Abstract An emissive liquid crystal display has a backlight and a liquid crystal cell for modulating the light. A phosphor layer receives the modulated light and converts the light into visible light. The phosphor layer may contain just red and green phosphors, with blue light being produced by the backlight, or may contain red, green, and blue phosphors based on near-ultraviolet light produced by the backlight. The use of the phosphor layer eliminates the need for a color filter within the liquid crystal cell and provides a greater transmittance efficiency. The liquid crystal display also provides an optimal viewing angle, correct chromacity for television, an increased contrast ratio, and a reduction in smear and flicker for a passive-matrix display. The liquid crystal display enables the use of redundant transistors in active-matrix displays and eliminates the need for retardation films or multiple domain architectures and, as a result, presents a lower manufacturing cost for the display.
Inventors
- 👤 Anthony M. Cupolo, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:50
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133617
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
143 words
An emissive liquid crystal display, comprising: a source of radiation; means for dispersing said radiation; means for modulating said radiation at a plurality of pixel locations, said modulating means including a layer of liquid crystal material to control a passage of said radiation through said pixel locations; a layer of emissive material positioned to receive modulated radiation from said modulating means and for converting said modulated radiation into visible light, said layer of emissive material producing at least red and green visible light; wherein said modulating means is located between said layer of emissive material and said source of radiation whereby said layer of emissive material produces said modulated visible light directly from said modulated radiation, said layer of emissive material comprises a phosphor layer, and said phosphor layer comprises only red and green phosphors for producing red and green visible light, respectively.
Claim 2
Dependent Claim
143 words
An emissive liquid crystal display, comprising: a source of radiation; means for dispersing said radiation; means for modulating said radiation at a plurality of pixel locations, said modulating means including a layer of liquid crystal material to control a passage of said radiation through said pixel locations; a layer of emissive material positioned to receive modulated radiation from said modulating means and for converting said modulated radiation into visible light, said layer of emissive material producing at least red and green visible light; wherein said modulating means is located between said layer of emissive material and said source of radiation whereby said layer of emissive material produces said modulated visible light directly from said modulated radiation, said layer of emissive material comprises a phosphor layer, and said phosphor layer comprises only red and green phosphors for producing red and green visible light, respectively.
Claim 3
Dependent Claim
25 words
The emissive liquid crystal display as set forth in claim 1, wherein said source of radiation emits light centered between 420 mm and 450 nm.
Claim 4
Dependent Claim
18 words
The emissive liquid crystal display as set forth in claim 1, wherein said dispersing means comprises a diffuser.
Claim 5
Dependent Claim
25 words
The emissive liquid crystal display as set forth in claim 1, further comprising means for collimating said radiation for reducing cross-talk between said pixel locations.
Claim 6
Dependent Claim
34 words
The emissive liquid crystal display as set forth in claim 1, further comprising a light pipe positioned between said source of radiation and said modulating means for directing said radiation across said pixel locations.
Claim 7
Dependent Claim
21 words
The emissive liquid crystal display as set forth in claim 1, wherein said modulating means comprises an active-matrix liquid crystal cell.
Claim 8
Dependent Claim
21 words
The emissive liquid crystal display as set forth in claim 1, wherein said modulating means comprises a passive-matrix liquid crystal cell.
Claim 9
Dependent Claim
48 words
The emissive liquid crystal display as set forth in claim 1, further comprising a dichroic filter positioned between said modulating means and said layer of emissive material, said dichroic filter being transmissive to said radiation and being reflective to visible light emitted from said layer of emissive material.
Claim 10
Dependent Claim
20 words
The emissive liquid crystal display as set forth in claim 1, wherein said modulating means comprises a liquid crystal cell.
Claim 11
Dependent Claim
46 words
The emissive liquid crystal display as set forth in claim 9 wherein said liquid crystal cell includes a first black matrix disposed between said layer of liquid crystal material and said layer of emissive material and said layer of emissive material includes a second black matrix.
Claim 12
Dependent Claim
24 words
The emissive liquid crystal display as set forth in claim 10, wherein said second black matrix is oversized relative to said first black matrix.
Claim 13
Dependent Claim
25 words
The emissive liquid crystal display as set forth in claim 10, wherein said first black matrix is equal in size to said second black matrix.
Claim 14
Dependent Claim
44 words
The emissive liquid crystal display as set forth in claim 1, further comprising a dichroic filter positioned on an opposite side of said layer of emissive material as said modulating means, said dichroic filter being transmissive to visible light and reflective to said radiation.
Claim 15
Dependent Claim
19 words
The emissive liquid crystal display as set forth in claim 1, wherein said source of radiation emits blue light.
Claim 16
Dependent Claim
33 words
The emissive liquid crystal display as set forth in claim 14, further comprising a diffusive element positioned to diffuse the modulated radiation from said modulating means, said diffusive element diffusing the blue light.
Claim 17
Dependent Claim
33 words
The emissive liquid crystal display as set forth in claim 1, further comprising diffusive elements positioned within spaces in the layer of emissive material for diffusing the modulated radiation from the modulating means.
Claim 18
Dependent Claim
172 words
An emissive liquid crystal display, comprising: a source of radiation; means for dispersing said radiation; means for modulating said radiation at a plurality of pixel locations, said modulating means including a layer of liquid crystal material to control a passage of said radiation through said pixel locations; a layer of emissive material positioned to receive modulated radiation from said modulating means and for converting said modulated radiation into visible light, said layer of emissive material producing at least red and green visible light; wherein said modulating means is located between said layer of emissive material and said source of radiation whereby said layer of emissive material produces said modulated visible light directly from said modulated radiation, said modulating means comprises a liquid crystal cell, said liquid crystal cell includes a first black matrix disposed between said layer of liquid crystal material and said layer of emissive material and said layer of emissive material includes a second black matrix, and wherein said first black matrix is oversized relative to said second black matrix.
Claim 19
Dependent Claim
172 words
An emissive liquid crystal display, comprising: a source of radiation; means for dispersing said radiation; means for modulating said radiation at a plurality of pixel locations, said modulating means including a layer of liquid crystal material to control a passage of said radiation through said pixel locations; a layer of emissive material positioned to receive modulated radiation from said modulating means and for converting said modulated radiation into visible light, said layer of emissive material producing at least red and green visible light; wherein said modulating means is located between said layer of emissive material and said source of radiation whereby said layer of emissive material produces said modulated visible light directly from said modulated radiation, said modulating means comprises a liquid crystal cell, said liquid crystal cell includes a first black matrix disposed between said layer of liquid crystal material and said layer of emissive material and said layer of emissive material includes a second black matrix, and wherein said first black matrix is oversized relative to said second black matrix.
Claim 20
Dependent Claim
25 words
The emissive liquid crystal display as set forth in claim 17, wherein said source of radiation emits light centered between 350 mm and 365 nm.
Claim 21
Dependent Claim
21 words
The emissive liquid crystal display as set forth in claim 17, wherein said layer of emissive material comprises a phosphor layer.
Claim 22
Dependent Claim
29 words
The emissive liquid crystal display as set forth in claim 19, wherein said phosphor layer comprises only red and green phosphors for producing red and green visible light, respectively.
Claim 23
Dependent Claim
31 words
The emissive liquid crystal display as set forth in claim 19, wherein said phosphor layer further comprises red, green, and blue phosphors for producing red, green, and blue visible light, respectively.
Claim 24
Dependent Claim
39 words
The emissive liquid crystal display as set forth in claim 19, further comprising a color mosaic filter having red filters aligned with red phosphors of said phosphor layer and green filters aligned with green phosphors of said phosphor layer.
Claim 25
Dependent Claim
49 words
The emissive liquid crystal display as set forth in claim 19, further comprising a color mosaic filter having red filters aligned with red phosphors of said phosphor layer, green filters aligned with green phosphors of said phosphor layer, and blue filters aligned with blue phosphors of said phosphor layer.
References Cited (Backward Citations)
US4881797A
Cited
JPS62194279A
Cited
JPS62194280A
Cited
US4799050A
Cited
US5146355A
Cited
US4822144A
Cited
US5305154A
Cited
JPH0277725A
Cited
US5510916A
Cited
US5504597A
Cited
JPH06222360A
Cited
US5434688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-08 | 2001-03-10 | 2001-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-08 | 2005-03-10 | 2005-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-08 | 2009-03-10 | 2009-09-09 | $7700.00 | Window Closed / Lapsed |