Patent US5287207A successfully refreshed from Google Patents.
US5287207A
Expired / Lapsed
US
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Double TN cell LCD display with different Gooch and Tarry extremes
Assignee: US Philips Corp
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Filing: 1992-09-02
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Granted: 1994-02-15
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Expires: 2012-09-02
Abstract
Abstract In a double cell the values of d.Δn for both the actual cell (10) and the compensation cell (20) having opposite twist angles φ are chosen to be such that they are associated with different Gooch & Tarry extrema for a given wavelength. The compensation cell may then be thicker and can be obtained in a simpler manner. A universal compensation cell may alternatively be used.
Inventors
- 👤 Johannes C. H. Mulkens
- 👤 Ingrid E. J. R. Heynderickx
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:34
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13471; G02F1/1335; G02F1/13363; G02F1/133636; G02F1/137; G02F1/139; G02F1/1396
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
200 words
A liquid crystal display device comprising a first liquid crystal cell and a compensating layer between two polarizers, the first cell comprising a twisted neumatic layer of liquid crystalline material having a twist angle φ 1 , a thickness d 1 , an anisotropy Δn 1 , and an optical path length difference d 1 .Δn 1 for incident light having a central wavelength λ 0 , the compensating layer comprising an optically anisotropic material having a twist angle φ 2 in the opposite direction of that of φ 1 , a thickness d 2 , an anisotropy Δn 2 and an optical path length difference d 2 .Δn 2 for incident light having a central wavelength λ 0 , characterized in that the twist angle φ 1 is between 65° and 115° and the value of d 1 .Δn 1 /λ 0 for the first liquid crystal cell is determined by a Gooch & Tarry extremum, while the twist angle φ 2 is between -115° and -65° for the compensating layer and the value of d 2 .Δn 2 /λ 0 is determined by a Gooch & Tarry extremum of a different order than that of the first cell.
Claim 2
Dependent Claim
200 words
A liquid crystal display device comprising a first liquid crystal cell and a compensating layer between two polarizers, the first cell comprising a twisted neumatic layer of liquid crystalline material having a twist angle φ 1 , a thickness d 1 , an anisotropy Δn 1 , and an optical path length difference d 1 .Δn 1 for incident light having a central wavelength λ 0 , the compensating layer comprising an optically anisotropic material having a twist angle φ 2 in the opposite direction of that of φ 1 , a thickness d 2 , an anisotropy Δn 2 and an optical path length difference d 2 .Δn 2 for incident light having a central wavelength λ 0 , characterized in that the twist angle φ 1 is between 65° and 115° and the value of d 1 .Δn 1 /λ 0 for the first liquid crystal cell is determined by a Gooch & Tarry extremum, while the twist angle φ 2 is between -115° and -65° for the compensating layer and the value of d 2 .Δn 2 /λ 0 is determined by a Gooch & Tarry extremum of a different order than that of the first cell.
Claim 3
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 1, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 65° and 75° and a d.Δn-/λ 0 value of 0.65-0.75 or of 1.60-1.70 or of 2.55-2.65 or of 3.45-3.65.
Claim 4
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 1, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 75° and 85° and a d.Δn-/λ 0 value of 0.75-0.85 or of 1.70-1.80 or of 2.65-2.75 or of 3.60-3.80.
Claim 5
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 1, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 85° and 95° and a d.Δn-/λ 0 value of 0.85-0.95 or of 1.90-2.00 or of 2.95-3.05 or of 3.90-4.10.
Claim 6
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 1, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 95° and 105° and a d.Δn-/λ 0 value of 0.90-1.00 or of 2.10-2.20 or of 3.15-3.25 or of 4.15-4.35.
Claim 7
Dependent Claim
50 words
A liquid crystal display device as claimed in any one of claim 1, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 105° and 115° and a d.Δn-/λ 0 value of 1.00-1.10 or of 2.15-2.25 or of 3.25-3.35 or of 4.25-4.45.
Claim 8
Dependent Claim
20 words
A liquid crystal display device as claimed in claim 1, characterized in that the polarizers cross each other mutually perpendicularly.
Claim 9
Dependent Claim
31 words
A liquid crystal display device as claimed in claim 7, characterized in that the compensating layer has a Gooch & Tarry extremum of a higher order than the first crystal cell.
Claim 10
Dependent Claim
50 words
A liquid crystal display device as claimed in claim 7, characterized in that the compensating layer comprises a liquid crystalline material and in that the director halfway across the first liquid crystal cell extends at a substantially right angle to the director halfway the compensating layer in the voltageless state.
Claim 11
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 7, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 65° and 75° and a d.Δn-/λ 0 value of 0.65-0.75 or of 1.60-1.70 or of 2.55-2.65 or of 3.45-3.65.
Claim 12
Dependent Claim
46 words
A liquid crystal display device as claimed in claim 7, characterized in that the first liquid crystal cell or the compensating layer has a twist angle between 75° and 85° and a d.Δn-/λ 0 value of 0.75-0.85 or of 1.70-1.80 or of 2.65-2.75 or of 3.60-3.80.
Claim 13
Dependent Claim
46 words
A liquid crystal display device as claimed in claim 7, characterized in that the first liquid crystal cell or the compensating layer has a twist angle between 85° and 95° and a d.Δn-/λ 0 value of 0.85-0.95 or of 1.90-2.00 or of 2.95-3.05 or of 3.90-4.10.
Claim 14
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 7, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 95° and 105° and a d.Δn-/λ 0 value of 0.90-1.00 or of 2.10-2.20 or of 3.15-3.25 or of 4.15-4.35.
Claim 15
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 7, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 105° and 115° and a d.Δn-/λ 0 value of 1.00-1.10 or of 2.15-2.25 or of 3.25-3.35 or of 4.25-4.45.
Claim 16
Dependent Claim
32 words
A liquid crystal display device as claimed in claim 1, characterized in that the compensating layer has a Gooch & Tarry extremum of a higher order than the first liquid crystal cell.
Claim 17
Dependent Claim
49 words
A liquid crystal display device as claimed in claim 15, characterized in that the compensating layer comprises a liquid crystalline material and in that the director halfway the first liquid crystal cell extends at a substantially right angle to the director halfway the compensating layer in the voltageless state.
Claim 18
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 15, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 65° and 75° and a d.Δn-/λ 0 value of 0.65-0.75 or of 1.60-1.70 or of 2.55-2.65 or of 3.45-3.65.
Claim 19
Dependent Claim
46 words
A liquid crystal display device as claimed in claim 15, characterized in that the first liquid crystal cell or the compensating layer has a twist angle between 75° and 85° and a d.Δn-/λ 0 value of 0.75-0.85 or of 1.70-1.80 or of 2.65-2.75 or of 3.60-3.80.
Claim 20
Dependent Claim
46 words
A liquid crystal display device as claimed in claim 15, characterized in that the first liquid crystal cell or the compensating layer has a twist angle between 85° and 95° and a d.Δn-/λ 0 value of 0.85-0.95 or of 1.90-2.00 or of 2.95-3.05 or of 3.90-4.10.
Claim 21
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 15, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 95° and 105° and a d.Δn-/λ 0 value of 0.90-1.00 or of 2.10-2.20 or of 3.15-3.25 or of 4.15-4.35.
Claim 22
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 15, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 105° and 115° and a d.Δn-/λ 0 value of 1.00-1.10 or of 2.15-2.25 or of 3.25-3.35 or of 4.25-4.45.
Claim 23
Dependent Claim
57 words
A liquid crystal display device as claimed in claim 1, characterized in that the compensating layer comprises a second liquid crystal cell having a liquid crystalline material and in that the director halfway across the first liquid crystal cell extends at a substantially right angle to the director halfway across the compensating layer in the voltageless state.
Claim 24
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 22, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 65° and 75° and a d.Δn-/λ 0 value of 0.65-0.75 or of 1.60-1.70 or of 2.55-2.65 or of 3.45-3.65.
Claim 25
Dependent Claim
46 words
A liquid crystal display device as claimed in claim 22, characterized in that the first liquid crystal cell or the compensating layer has a twist angle between 75° and 85° and a d.Δn-/λ 0 value of 0.75-0.85 or of 1.70-1.80 or of 2.65-2.75 or of 3.60-3.80.
Claim 26
Dependent Claim
46 words
A liquid crystal display device as claimed in claim 22, characterized in that the first liquid crystal cell or the compensating layer has a twist angle between 85° and 95° and a d.Δn-/λ 0 value of 0.85-0.95 or of 1.90-2.00 or of 2.95-3.05 or of 3.90-4.10.
Claim 27
Dependent Claim
47 words
A liquid crystal display device as claimed in claim 22, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 95° and 105° and a d.Δn-/λ 0 value of 0.90-1.00 or of 2.10-2.20 or of 3.15-3.25 or of 4.15-4.35.
Claim 28
Dependent Claim
46 words
A liquid crystal display device as claimed in claim 22, characterized in that the first liquid crystal cell or the compensating layer has a twist angle of between 105° and 115° and d.Δn-/λ 0 value of 1.00-1.10 or of 2.15-2.25 or of 3.25-3.25 or of 4.25-4.45.
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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) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |