US5499126A
Expired / Lapsed
US
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Liquid crystal display with patterned retardation films
Assignee: Guardian Industries Corp
•
Filing: 1993-12-02
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Granted: 1996-03-12
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Expires: 2013-12-02
Abstract
Abstract A multi-colored pixel for a twisted nematic liquid crystal display including red, green, and blue subpixels, wherein each subpixel includes a pair of substrates, a pair of polarizers, opposing electrodes, and a color personalized retardation film which compensates for the different wavelength of each color. The personalized retardation films of the different color subpixels results in elimination of the multi-gap approach and substantially eliminates the problem of different color leakages at different viewing angles, including normal. Also, one polymer based element, preferably a polyimide, functions as both a color filter and a retardation film in certain embodiments of this invention.
Inventors
- 👤 Adiel Abileah
- 👤 Gang Xu
- 👤 Patrick F. Brinkley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:45
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133509; G02F1/133514; G02F1/13356; G02F1/133565; G02F1/133631; G02F2413/00; G02F2413/02; G02F2413/03; G02F2413/07
Claims Analysis
Total Claims: 53
Claim 1
Independent Claim
66 words
A twisted nematic pixel for use in a liquid crystal display, said pixel comprising: a first subpixel having a first color filter and first retardation film; a second subpixel having a second color filter and a second retardation film; and wherein said first and second retardation films have retardation values different from one another and said first and second color filters are different from one another.
Claim 2
Dependent Claim
66 words
A twisted nematic pixel for use in a liquid crystal display, said pixel comprising: a first subpixel having a first color filter and first retardation film; a second subpixel having a second color filter and a second retardation film; and wherein said first and second retardation films have retardation values different from one another and said first and second color filters are different from one another.
Claim 3
Dependent Claim
26 words
The pixel of claim 1, wherein said first and second retardation films and their respective retardation values are selected according to the color of each subpixel.
Claim 4
Dependent Claim
36 words
The pixel of claim 2, further including a third subpixel having a third color filter and a third retardation film having a retardation value different than said retardation values of said first and second retardation films.
Claim 5
Dependent Claim
23 words
The pixel of claim 2, wherein said first and second retardation films are directly deposited onto said first and second color filters respectively.
Claim 6
Dependent Claim
42 words
The pixel of claim 4, further comprising a liquid crystal layer having a thickness less than about 10 μm, and wherein said color filters are located on a substrate and wherein said substrate is located between said color filters and a polarizer.
Claim 7
Dependent Claim
42 words
The pixel of claim 5, further comprising a retardation layer between said substrate and said polarizer and wherein said retardation layer has a substantially constant retardation value and wherein said first color filter is red and said second color filter is green.
Claim 8
Dependent Claim
23 words
The pixel of claim 2, wherein said first and second retardation films are made of the same material and having substantially different thickness.
Claim 9
Dependent Claim
22 words
The pixel of claim 2, wherein said first and second retardation films are made of different materials yet have substantially equal thicknesses.
Claim 10
Dependent Claim
22 words
The pixel of claim 2, wherein said first and second retardation films are made of different materials and have substantially different thicknesses.
Claim 11
Dependent Claim
22 words
The pixel of claim 2, wherein said first and second retardation films are spin-coated onto said first and second color filters respectively.
Claim 12
Dependent Claim
16 words
An active matrix liquid crystal display comprising a matrix array of the pixels of claim 2.
Claim 13
Dependent Claim
22 words
The pixel of claim 1, wherein said first and second retardation films have optical axes which are substantially parallel to one another.
Claim 14
Dependent Claim
44 words
The pixel of claim 1, wherein said first and second retardation films have retardation values greater than zero, and said pixel further comprises a liquid crystal layer which twists at least one visible normally incident wavelength of light about 82°-100° as it passes therethrough.
Claim 15
Dependent Claim
47 words
The pixel of claim 1, wherein a red wavelength of about 630 nm, a green wavelength of about 550 nm, and a blue wavelength of about 480 nm all have contrast ratios at a normal viewing angle, 0° horizontal and 0° vertical of at least about 50:1.
Claim 16
Dependent Claim
25 words
The pixel of claim 14, wherein all three of said wavelengths have a contrast ratio at said normal viewing angle of at least about 110:1.
Claim 17
Dependent Claim
36 words
The pixel of claim 14, wherein all three of said wavelengths have at least about a 30:1 contrast ratio at viewing angles of about: (i) 0° vertical, ±30° horizontal; and (ii) ±20 ° vertical, 0° horizontal.
Claim 18
Dependent Claim
28 words
The pixel of claim 16 wherein all three of said wavelengths have at least about 50:1 contrast ratios at a viewing angle of about 0° horizontal, 30° vertical.
Claim 19
Dependent Claim
39 words
The pixel of claim 1, wherein a red wavelength of about 630 nm and a green wavelength of about 550 nm each have contrast ratios of at least about 50:1 at viewing angles of about ±50° horizontal, 0° vertical.
Claim 20
Dependent Claim
13 words
The pixel of claim 1, wherein said pixel is a normally black pixel.
Claim 21
Dependent Claim
13 words
The pixel of claim 1, wherein said pixel is a normally white pixel.
Claim 22
Dependent Claim
11 words
The pixel of claim 1, wherein said retardation values are positive.
Claim 23
Dependent Claim
11 words
The pixel of claim 1, wherein said retardation values are negative.
Claim 24
Dependent Claim
30 words
The pixel of claim 1, further including a liquid crystal layer which twists normally incident light about 180°-270° when said light passes therethrough thereby defining a supertwisted liquid crystal pixel.
Claim 25
Dependent Claim
121 words
A multi-colored pixel for use in a liquid crystal display, comprising: a first polarizer on a first substrate; a second polarizer on a viewer side of the pixel, and on a second substrate; a liquid crystal layer disposed between said first and second polarizers; first and second subpixels each having a different color optical filter therein for transmitting a different predetermined color or wavelength of optical radiation; and wherein said first subpixel includes a first retardation means having a first predetermined retardation value, and said second subpixel includes a second retardation means having a second predetermined retardation value different than said first predetermined retardation value, and wherein said first and second retardation means are disposed between said first and second substrates.
Claim 26
Dependent Claim
121 words
A multi-colored pixel for use in a liquid crystal display, comprising: a first polarizer on a first substrate; a second polarizer on a viewer side of the pixel, and on a second substrate; a liquid crystal layer disposed between said first and second polarizers; first and second subpixels each having a different color optical filter therein for transmitting a different predetermined color or wavelength of optical radiation; and wherein said first subpixel includes a first retardation means having a first predetermined retardation value, and said second subpixel includes a second retardation means having a second predetermined retardation value different than said first predetermined retardation value, and wherein said first and second retardation means are disposed between said first and second substrates.
Claim 27
Dependent Claim
25 words
The pixel of claim 24, wherein said first and second retardation values are selected according to the different colors of said first and second subpixels.
Claim 28
Dependent Claim
36 words
The pixel of claim 25, wherein said first subpixel has a red color filter and said second subpixel has a green color filter and said liquid crystal layer has a thickness less than about 10 μm.
Claim 29
Dependent Claim
33 words
The pixel of claim 26, further comprising a third subpixel having a blue color filter and a third retardation means having a third retardation value different than said first and second retardation values.
Claim 30
Dependent Claim
47 words
The pixel of claim 24, wherein said liquid crystal layer is of the twisted nematic type and is disposed between said first and second substrates and wherein at least one wavelength of visible light is twisted about 82°-100° by the liquid crystal layer in the OFF state.
Claim 31
Dependent Claim
29 words
The pixel of claim 28, wherein said color filters are located on said second substrate with said liquid crystal layer disposed between said color filters and said first substrate.
Claim 32
Dependent Claim
19 words
The pixel of claim 29, wherein said first and second retardation means are directly laminated on said color filters.
Claim 33
Dependent Claim
22 words
The pixel of claim 30, wherein said first and second retardation means are located between said color filters and said second substrate.
Claim 34
Dependent Claim
41 words
The pixel of claim 30, wherein said first and second retardation means are located on a top side of said color filters adjacent said liquid crystal layer whereby said color filters are located between said second substrate and said retardation means.
Claim 35
Dependent Claim
37 words
The pixel of claim 30, further comprising a transparent electrode film directly laminated on said first and second retardation means whereby said color filters and said retardation means are disposed between said electrode and said second substrate.
Claim 36
Dependent Claim
30 words
The pixel of claim 33, further comprising an orientation film laminated onto said transparent electrode whereby said liquid crystal layer is disposed between said orientation film and said first substrate.
Claim 37
Dependent Claim
38 words
The pixel of claim 24, wherein said first retardation means includes an optical compensating film having a first thickness and said second retardation means includes an optical compensating film having a second thickness different than said first thickness.
Claim 38
Dependent Claim
38 words
The pixel of claim 35, wherein said second retardation means has a retardation value larger than said value of said first retardation means and wherein said liquid crystal layer has a thickness of less than about 10 μm.
Claim 39
Dependent Claim
27 words
The pixel of claim 36, wherein said retardation values are negative and said first and second polarizers have transmission axes which are substantially perpendicular to one another.
Claim 40
Dependent Claim
11 words
The pixel of claim 36, wherein said retardation values are positive.
Claim 41
Dependent Claim
21 words
The pixel of claim 38, wherein said first and second polarizers have transmission axes which are substantially parallel to one another.
Claim 42
Dependent Claim
34 words
The pixel of claim 35, wherein said liquid crystal material has about a 90° twist for at least one wavelength of visible light in the OFF state when no voltage is being applied thereto.
Claim 43
Dependent Claim
51 words
The pixel of claim 24, wherein said first and second retardation means each include an optical compensating or retardation film directly laminated onto said color filters, and said color filters are laminated onto said second substrate whereby said liquid crystal layer is disposed between said retardation means and said first substrate.
Claim 44
Dependent Claim
37 words
The pixel of claim 41, wherein said first and second retardation means combine to include only one optical compensating film and wherein said optical compensating film has an upper terraced surface defining different thicknesses of said film.
Claim 45
Dependent Claim
20 words
The pixel of claim 41, further comprising a third retardation means laminated between said second substrate and said second polarizer.
Claim 46
Dependent Claim
21 words
The pixel of claim 24, further comprising a third retardation means laminated directly between said second substrate and said second polarizer.
Claim 47
Dependent Claim
21 words
The pixel of claim 24, further comprising a third retardation means laminated directly between said first substrate and said first polarizer.
Claim 48
Dependent Claim
15 words
The pixel of claim 24, further comprising an active matrix element on said first substrate.
Claim 49
Dependent Claim
25 words
The pixel of claim 24, further comprising a third subpixel having a color filter different than said color filters of said first and second subpixels.
Claim 50
Dependent Claim
42 words
The pixel of claim 47, wherein only said first and second subpixels include a retardation means directly laminated onto said color filters wherein said retardation values of said first and second retardation means are selected according to the color of each subpixel.
Claim 51
Dependent Claim
41 words
The pixel of claim 48, further comprising a third retardation means for all three subpixels laminated between one of said polarizers and one of said substrates, wherein said third retardation means includes an optical compensating film having a substantially constant thickness.
Claim 52
Dependent Claim
39 words
The pixel of claim 24, wherein a red wavelength of about 630 nm and a green wavelength of about 550 nm each have contrast ratios of at least about 30:1 at viewing angles of about ±50° horizontal, 0° vertical.
Claim 53
Dependent Claim
31 words
The pixel of claim 50, wherein a blue wavelength of about 480 nm has a contrast ratio of at least about 100:1 at viewing angles of about 0° horizontal, ±20° vertical.
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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) | 1999-03-12 | 1999-09-11 | 2000-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-12 | 2003-09-11 | 2004-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-12 | 2007-09-11 | 2008-03-12 | $7700.00 | Window Closed / Lapsed |