US4552436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display having uniform transmittance
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1983-07-26
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Granted: 1985-11-12
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Expires: 2003-07-26
Abstract
Abstract A liquid crystal display having a uniform transmittance in the visible light range. The display includes a polarizer and analyzer which correct a non-uniform light transmittance of a liquid crystal layer. This is accomplished by controlling an angle between polarization axes of the polarizer and the analyzer in dependence on the product of a refractive index anisotropy and a thickness of the liquid crystal layer, so that the combined transmittance of the polarizer and the analyzer is a maximum in the wavelength range from 400 nm to 500 nm. When the product is approximately 0.5 μm, the angle is selected in the range from 92 to 110 degrees and when the product is approximately 1.0 μm, the angle is selected in the range from 94 to 120 degrees.
Inventors
- 👤 Shuichi Kozaki
- 👤 Yutaka Ishii
- 👤 Fumiaki Funada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:09
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/1396
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
A liquid crystal display, comprising; a polarizer having a first polarization axis; an analyzer having a second polarization axis, the first and second polarization axes forming an angle therebetween; and a liquid crystal layer, mounted between said polarizer and said analyzer, having a refractive index anisotropy and thickness, such that when the product of the refractive index anisotropy and thickness is approximately 0.5 μm, the angle is selected in the range from 92 and 110 degrees, so that a combined light transmittance of said polarizer and said analyzer is a maximum in the wavelength range from 400 nm to 500 nm.
Claim 2
Dependent Claim
101 words
A liquid crystal display, comprising; a polarizer having a first polarization axis; an analyzer having a second polarization axis, the first and second polarization axes forming an angle therebetween; and a liquid crystal layer, mounted between said polarizer and said analyzer, having a refractive index anisotropy and thickness, such that when the product of the refractive index anisotropy and thickness is approximately 0.5 μm, the angle is selected in the range from 92 and 110 degrees, so that a combined light transmittance of said polarizer and said analyzer is a maximum in the wavelength range from 400 nm to 500 nm.
Claim 3
Dependent Claim
16 words
A liquid crystal display as recited in claim 1, wherein said liquid crystal layer comprises PCH.
Claim 4
Dependent Claim
19 words
A liquid crystal display as recited in claim 2, wherein said liquid crystal layer has a twisted nematic structure.
Claim 5
Dependent Claim
102 words
A liquid crystal display, comprising; a polarizer having a first polarization axis; an analyzer having a second polarization axis, the first and second polarization axes forming an angle therebetween; and a liquid crystal layer, mounted between said polarizer and said analyzer, having a refractive index anisotropy and a thickness, such that when the product of the refractive index anisotropy and thickness is approximately 1.0 μm, the angle is selected in the range from 94 to 120 degrees, so that a combined light transmittance of said polarizer and said analyzer is a maximum in the wavelength range from 400 nm to 500 nm.
Claim 6
Dependent Claim
102 words
A liquid crystal display, comprising; a polarizer having a first polarization axis; an analyzer having a second polarization axis, the first and second polarization axes forming an angle therebetween; and a liquid crystal layer, mounted between said polarizer and said analyzer, having a refractive index anisotropy and a thickness, such that when the product of the refractive index anisotropy and thickness is approximately 1.0 μm, the angle is selected in the range from 94 to 120 degrees, so that a combined light transmittance of said polarizer and said analyzer is a maximum in the wavelength range from 400 nm to 500 nm.
Claim 7
Dependent Claim
22 words
A liquid crsytal display as recited in claim 4, wherein said liquid crystal layer comprises a mixture of PCH, biphenyl and ester.
Claim 8
Dependent Claim
19 words
A liquid crystal display as recited in claim 5, wherein said liquid crystal layer has a twisted nematic structure.
Claim 9
Dependent Claim
131 words
A liquid crystal display, comprising: liquid crystal layer means for transmitting visible light, having a varying transmittance characteristic dependent upon a frequency of the light transmitted and a product of a refractive index anisotropy and a thickness; and means, mounted adjacent said liquid crystal layer and transmitting the visible light, for compensating the varying transmittance characteristic of said liquid crystal layer means and producing a substantially constant transmittance of the visible light, so that the visible light passing through said liquid crystal layer means and said means for compensating is transmitted substantially uniformly at the visible light frequencies, said means for compensating comprising a polarizer and an analyzer having respective polarization axes, and said means for compensating compensates by selecting an angle between the polarization axes in dependence upon the product.
Claim 10
Dependent Claim
131 words
A liquid crystal display, comprising: liquid crystal layer means for transmitting visible light, having a varying transmittance characteristic dependent upon a frequency of the light transmitted and a product of a refractive index anisotropy and a thickness; and means, mounted adjacent said liquid crystal layer and transmitting the visible light, for compensating the varying transmittance characteristic of said liquid crystal layer means and producing a substantially constant transmittance of the visible light, so that the visible light passing through said liquid crystal layer means and said means for compensating is transmitted substantially uniformly at the visible light frequencies, said means for compensating comprising a polarizer and an analyzer having respective polarization axes, and said means for compensating compensates by selecting an angle between the polarization axes in dependence upon the product.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |