US5559618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal compensator satisfying nx>nz>ny having ny and nz inclined
Assignee: Fujifilm Holdings Corp
•
Filing: 1994-10-20
•
Granted: 1996-09-24
•
Expires: 2014-10-20
Abstract
Abstract Disclosed is an optical compensatory sheet which has nx, ny and nz satisfying the condition of nx>nz>ny wherein nx, ny and nz represent main refractictive indices, and wherein the direction of nx is on the plane of the sheet, the direction of ny is inclined from the plane of the sheet and the direction of nz is inclined from the normal of the sheet, the directions of ny and nz crossing each other at a right angle, and a liquid crystal display provided with the optical compensatory sheet.
Inventors
- 👤 Hiroyuki Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:04
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133632; G02B; G02B5/00; G02B5/30; G02B5/3083; G02F1/133634
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
An optical compensatory sheet which has main refractive indices of nx, ny and nz satisfying the condition of nx>nz>ny, wherein the direction of nx is on the plane of the sheet, the direction of ny is inclined from the plane of the sheet and the direction of nz is inclined at 5 to 50 degrees from the normal to the sheet, the directions of ny and nz crossing each other at a right angle.
Claim 2
Dependent Claim
74 words
An optical compensatory sheet which has main refractive indices of nx, ny and nz satisfying the condition of nx>nz>ny, wherein the direction of nx is on the plane of the sheet, the direction of ny is inclined from the plane of the sheet and the direction of nz is inclined at 5 to 50 degrees from the normal to the sheet, the directions of ny and nz crossing each other at a right angle.
Claim 3
Dependent Claim
27 words
The optical compensatory sheet as defined in claim 1, which shows a retardation of 50 to 1,000 nm to a light having a wavelength of 632.8 nm.
Claim 4
Dependent Claim
19 words
The optical compensatory sheet as defined in claim 1, nx, ny and nz further satisfy the condition of: 0.2≦(nx-nz)/(nx-ny)≦0.8.
Claim 5
Dependent Claim
135 words
A liquid crystal display comprising a liquid crystal cell which comprises a pair of substrates each of which is provided with a transparent electrode and liquid crystal sealed therebetween, a polarizing sheet arranged on each side of the cell, and an optical compensatory sheet provided between at least one side of the liquid crystal cell and the polarizing sheet; wherein the optical compensatory sheet has main refractive indices of nx, ny and nz satisfying the condition of nx>nz>ny, in which the direction of nx is on the plane of the sheet, the direction of ny is inclined from the plane of the sheet and the direction of nz is inclined at a 5 to 50 degrees from the normal to the sheet, the directions of ny and nz crossing each other at a right angle.
Claim 6
Dependent Claim
135 words
A liquid crystal display comprising a liquid crystal cell which comprises a pair of substrates each of which is provided with a transparent electrode and liquid crystal sealed therebetween, a polarizing sheet arranged on each side of the cell, and an optical compensatory sheet provided between at least one side of the liquid crystal cell and the polarizing sheet; wherein the optical compensatory sheet has main refractive indices of nx, ny and nz satisfying the condition of nx>nz>ny, in which the direction of nx is on the plane of the sheet, the direction of ny is inclined from the plane of the sheet and the direction of nz is inclined at a 5 to 50 degrees from the normal to the sheet, the directions of ny and nz crossing each other at a right angle.
Claim 7
Dependent Claim
101 words
The liquid crystal display as defined in claim 4, wherein the optical compensatory sheet is provided on each side of the liquid crystal cell to form a pair of optical compensatory sheets, and the optical compensatory sheets are arranged in such a manner that the surfaces of the sheets of the sides to which the directions of ny and nz are inclined face to the surfaces of the liquid crystal cell, and an angle formed where two directions of nx of the two sheets cross each other is equally divided by a bisector of a twist angle of the liquid crystal.
Claim 8
Dependent Claim
19 words
The liquid crystal display as defined in claim 4, wherein the liquid crystal is super twisted nematic liquid crystal.
Claim 9
Dependent Claim
155 words
A liquid crystal display comprising a liquid crystal cell which comprises a pair of substrates each of which is provided with a transparent electrode and liquid crystal sealed therebetween, a polarizing sheet arranged on each side of the cell, and an optical compensatory sheet provided between at least one side of the liquid crystal cell and the polarizing sheet; wherein the optical compensatory sheet has main refractive indices of nx, ny and nz satisfying the condition of nx>nz>ny, in which the direction of nx is on the plane of the sheet, the direction of ny is inclined from the plane of the sheet and the direction of nz is inclined at 5 to 50 degrees from the normal to the sheet, the directions of ny and nz crossing each other at a right angle; and the optical compensatory sheet further shows retardation of 50 to 1,000 nm to light having a wavelength of 632.8 nm.
Claim 10
Dependent Claim
155 words
A liquid crystal display comprising a liquid crystal cell which comprises a pair of substrates each of which is provided with a transparent electrode and liquid crystal sealed therebetween, a polarizing sheet arranged on each side of the cell, and an optical compensatory sheet provided between at least one side of the liquid crystal cell and the polarizing sheet; wherein the optical compensatory sheet has main refractive indices of nx, ny and nz satisfying the condition of nx>nz>ny, in which the direction of nx is on the plane of the sheet, the direction of ny is inclined from the plane of the sheet and the direction of nz is inclined at 5 to 50 degrees from the normal to the sheet, the directions of ny and nz crossing each other at a right angle; and the optical compensatory sheet further shows retardation of 50 to 1,000 nm to light having a wavelength of 632.8 nm.
Claim 11
Dependent Claim
101 words
The liquid crystal display as defined in claim 7, wherein the optical compensatory sheet is provided on each side of the liquid crystal cell to form a pair of optical compensatory sheets, and the optical compensatory sheets are arranged in such a manner that the surfaces of the sheets of the sides to which the directions of ny and nz are inclined face to the surfaces of the liquid crystal cell, and an angle formed where two directions of nx of the two sheets cross each other is equally divided by a bisector of a twist angle of the liquid crystal.
Claim 12
Dependent Claim
19 words
The liquid crystal display as defined in claim 7, wherein the liquid crystal is super twisted nematic liquid crystal.
References Cited (Backward Citations)
US3924930A
Cited
US5194975A
Cited
JPH02285303A
Cited
JPH02308128A
Cited
US5175638A
Cited
US5184237A
Cited
JPH04113301A
Cited
JPH04120512A
Cited
JPH05157911A
Cited
US5245456A
Cited
JPH05196818A
Cited
US5227903A
Cited
JPH0580323A
Cited
JPH05157913A
Cited
EP0576304A1
Cited
US5375006A
Cited
JPH06174920A
Cited
US5490006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-24 | 2000-03-25 | 2000-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-24 | 2004-03-25 | 2004-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-24 | 2008-03-25 | 2008-09-24 | $7700.00 | Window Closed / Lapsed |