US5969781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homeotropic liquid crystal display with common electrodes parallel and positioned at both sides of pixel electrodes to improve viewing angle
Assignee: Gold Charm Ltd
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Filing: 1998-06-30
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Granted: 1999-10-19
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Expires: 2018-06-30
Abstract
Abstract An LCD (Liquid Crystal Display) of the present invention includes a pair of substrates facing each other and at least one of which is transparent. A liquid crystal composition intervenes between the substrates. Scanning wirings and signal wirings are arranged on one substrate in a matrix configuration. Pixel electrodes each constitutes one pixel. Switching devices each is positioned at a portion where one of the scanning wirings and one of the signal wirings intersect each other, for controlling the application of a voltage to the associated pixel electrode. Common electrodes are formed on the other substrate. The liquid crystal composition has positive dielectric constant anisotropy and is oriented vertically to the facing surfaces of the substrates when a voltage is not applied. The common electrodes are parallel to the pixel electrodes and positioned at both sides of said pixel electrodes.
Inventors
- 👤 Hiroaki Matsuyama
- 👤 Shinichi Nishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/134363; G02F1/137; G02F1/139; G02F1/1393; G02F2201/00; G02F2201/12; G02F2201/121
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
181 words
An LCD comprising: a pair of substrates facing each other and at least one of which is transparent; a liquid crystal composition intervening between said pair of substrates; scanning wirings and signal wirings arranged on one of said pair of substrates in a matrix configuration; a plurality of pixel electrodes; switching devices each being positioned at a portion where one of said scanning wirings and one of said signal wirings intersect each other, for controlling application of a voltage to an associated one of said pixel electrodes; and a plurality of common electrodes parallel to each other formed on the other substrate; wherein said liquid crystal composition has positive dielectric constant anisotropy and is oriented vertically to facing surfaces of said pair of substrates when a voltage is not applied, and wherein adjoining pairs of said common electrodes and adjoining pairs of said signal wirings define pixels, and each of said pixel electrodes is positioned in one of said pixels such that said common electrodes are parallel to said pixel electrodes and are positioned at both sides of said pixel electrodes.
Claim 2
Dependent Claim
181 words
An LCD comprising: a pair of substrates facing each other and at least one of which is transparent; a liquid crystal composition intervening between said pair of substrates; scanning wirings and signal wirings arranged on one of said pair of substrates in a matrix configuration; a plurality of pixel electrodes; switching devices each being positioned at a portion where one of said scanning wirings and one of said signal wirings intersect each other, for controlling application of a voltage to an associated one of said pixel electrodes; and a plurality of common electrodes parallel to each other formed on the other substrate; wherein said liquid crystal composition has positive dielectric constant anisotropy and is oriented vertically to facing surfaces of said pair of substrates when a voltage is not applied, and wherein adjoining pairs of said common electrodes and adjoining pairs of said signal wirings define pixels, and each of said pixel electrodes is positioned in one of said pixels such that said common electrodes are parallel to said pixel electrodes and are positioned at both sides of said pixel electrodes.
Claim 3
Dependent Claim
48 words
An LCD as claimed in claim 1, wherein each of said pixel electrodes is connected to an associated one of said switching devices and extended to one of said scanning wirings to be scanned immediately before an adjoining scanning wiring to which the associated switching device is connected.
Claim 4
Dependent Claim
22 words
An LCD as claimed in claim 2, wherein said pixel electrode and said adjoining scanning wiring face in parallel to each other.
Claim 5
Dependent Claim
52 words
An LCD as claimed in claim 3, wherein there is satisfied the condition: 10°<tan.sup.-1 [d/(w+L)]<30° where d is the distance between said pair of substrates, w is the width of each of said pixel electrodes and said common electrodes, and L is the distance between said pixel electrodes and said common electrodes.
Claim 6
Dependent Claim
27 words
An LCD as claimed in claim 4, wherein there is satisfied the condition: 350 nm<Δn·d<700 nm where Δn is refractive index anisotropy of said liquid crystal composition.
Claim 7
Dependent Claim
22 words
An LCD as claimed in claim 5, wherein said liquid crystal composition has dielectric constant anisotropy Δε satisfying the condition: Δε>10. 7.
Claim 8
Dependent Claim
52 words
An LCD as claimed in claim 2, wherein there is satisfied a condition: 10°<tan.sup.-1 [d/(w+L)]<30° where d is the distance between said pair of substrates, w is the width of each of said pixel electrodes and said common electrodes, and L is the distance between said pixel electrodes and said common electrodes.
Claim 9
Dependent Claim
37 words
An LCD as claimed in claim 2, wherein there is satisfied the condition: 350 nm<Δn·d<700 nm where Δn is refractive index anisotropy of said liquid crystal composition, and d is the distance between said pair of substrates.
Claim 10
Dependent Claim
21 words
An LCD as claimed in claim 2, wherein said liquid crystal composition has dielectric constant anisotropy Δε satisfying a condition: Δε>10.
Claim 11
Dependent Claim
52 words
An LCD as claimed in claim 1, wherein there is satisfied the condition: 10°<tan.sup.-1 [d/(w+L)]<30° where d is the distance between said pair of substrates, w is the width of each of said pixel electrodes and said common electrodes, and L is the distance between said pixel electrodes and said common electrodes.
Claim 12
Dependent Claim
37 words
An LCD as claimed in claim 1, wherein there is satisfied the condition: 350 nm<Δn·d<700 nm where Δn is refractive index anisotropy of said liquid crystal composition, and d is the distance between said pair of substrates.
Claim 13
Dependent Claim
21 words
An LCD as claimed in claim 1, wherein said liquid crystal composition has dielectric constant anisotropy Δε satisfying the condition: Δε>10.
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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) | 2002-10-18 | 2003-04-19 | 2003-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-18 | 2007-04-19 | 2007-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-18 | 2011-04-19 | 2011-10-19 | $7700.00 | Window Closed / Lapsed |