Patent US5664072A successfully refreshed from Google Patents.
Patent US5671031A successfully refreshed from Google Patents.
US5671031A
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Reflection type liquid crystal display device and personal digital equipment using the same
Assignee: Sharp Corp
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Filing: 1996-08-27
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Granted: 1997-09-23
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Expires: 2016-08-27
Abstract
Abstract A reflection type liquid crystal display device of the present invention includes: a first substrate having a reflective electrode formed thereon; a second substrate having a transparent counter substrate and a color filter formed thereon; and a liquid crystal layer interposed between the first and second substrates, wherein the color filter includes a red color filter portion and a cyan color filter portion. The cyan color filter portion transmits light having a complementary color of a color of light transmitted through the red color filter portion. The light transmitted through the red color filter portion has a chromaticity (x, y) on the XYZ color system chromaticity diagram satisfying the following formulae at a 2 DEG viewing angle using a standard light source D65: (0.038)2</=(x-0.313)2+(25/4)x(y-0.329)2</=(0.178)2; y</=0.145x+0.236; and y>/=-0.233x+0.376.
Inventors
- 👤 Kozo Nakamura
- 👤 Mariko Ban
- 👤 Naofumi Kimura
- 👤 Akio Haneda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:16
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; G02F1/136
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
136 words
A reflection type liquid crystal display device comprising: a first substrate having a reflective electrode formed thereon; a second substrate having a transparent counter substrate and a color filter formed thereon; and a liquid crystal layer interposed between the first substrate and the second substrate, wherein the color filter includes a red color filter portion and a cyan color filter portion, the cyan color filter portion transmitting light having a complementary color of a color of light transmitted through the red color filter portion, and wherein the light transmitted through the red color filter portion has a chromaticity (x, y) on an XYZ color system chromaticity diagram satisfying the following formulae under the condition of a 2° viewing angle using a standard light source D 65 : (0.038).sup.2 ≦(x-0.313).sup.2 +(25/4)·(y-0.329).sup.2 ≦(0.178).sup.2 ; y≦0.145x+0.236; and y≧-0.233x+0.376. 2.
Claim 2
Dependent Claim
136 words
A reflection type liquid crystal display device comprising: a first substrate having a reflective electrode formed thereon; a second substrate having a transparent counter substrate and a color filter formed thereon; and a liquid crystal layer interposed between the first substrate and the second substrate, wherein the color filter includes a red color filter portion and a cyan color filter portion, the cyan color filter portion transmitting light having a complementary color of a color of light transmitted through the red color filter portion, and wherein the light transmitted through the red color filter portion has a chromaticity (x, y) on an XYZ color system chromaticity diagram satisfying the following formulae under the condition of a 2° viewing angle using a standard light source D 65 : (0.038).sup.2 ≦(x-0.313).sup.2 +(25/4)·(y-0.329).sup.2 ≦(0.178).sup.2 ; y≦0.145x+0.236; and y≧-0.233x+0.376. 2.
Claim 3
Dependent Claim
45 words
A reflection type liquid crystal display device according to claim 1, wherein the light transmitted through the red color filter portion further has the chromaticity (x, y) on the XYZ color system chromaticity diagram satisfying the following formulae: (0.038).sup.2 ≦(x-0.313).sup.2 +(25/4)·(y-0.329).sup.2 ; y≦-0.233x+0.412; and x=0.420.
Claim 4
Dependent Claim
56 words
A reflection type liquid crystal display device according to claim 1, wherein the light transmitted through the red color filter portion after being reflected by the reflective electrode have a value of Y in the range from 30 to 75, the value of Y being one of three stimulus values defined in the XYZ color system.
Claim 5
Dependent Claim
132 words
A reflection type liquid crystal display device according to claim 1, wherein white colored light is obtained by mixing the light transmitted through the cyan color filter portion with the light transmitted through the red color filter portion, a range of a chromaticity of the white colored light being an elliptical range defined by the chromaticity (x, y) of (0.321, 0.310) as its center on the XYZ color system chromaticity diagram and having a major axis of 0.018, a minor axis of 0.014, and a tilt angle of 45°, and wherein the light transmitted through the red color filter portion after being reflected by the reflective electrode has a value of Y of 25 or more, the value of Y being one of the three stimulus values in the XYZ color system.
Claim 6
Dependent Claim
42 words
A reflection type liquid crystal display device according to claim 4, wherein values x and y of the chromaticity (x, y) of the white colored light are within a range from 0.301 to 0.317 and a range from 0.310 to 0.333, respectively.
Claim 7
Dependent Claim
33 words
A reflection type liquid crystal display device according to claim 1, wherein the liquid crystal layer has a transmittance of 40% in a bright state, and 15% or less in a dark state.
Claim 8
Dependent Claim
23 words
A personal digital equipment comprising a display portion, wherein the display portion is a liquid crystal display device as claimed in claim 1.
Claim 9
Dependent Claim
90 words
A color filter including a red color filter portion and a cyan color filter portion, wherein the cyan color filter portion transmits light having a complementary color of a color of light transmitted through the red color filter portion, and wherein the light transmitted through the red color filter portion has a chromaticity (x, y) on an XYZ color system chromaticity diagram satisfying the following formulae under the condition of a 2° viewing angle using a standard light source D 65 : (0.038).sup.2 ≦(x-0.313).sup.2 +(25/4)·(y-0.329).sup.2 ≦(0.178).sup.2 ; y≦0.145x+0.236; and y≧-0.233x+0.376.
Claim 10
Dependent Claim
90 words
A color filter including a red color filter portion and a cyan color filter portion, wherein the cyan color filter portion transmits light having a complementary color of a color of light transmitted through the red color filter portion, and wherein the light transmitted through the red color filter portion has a chromaticity (x, y) on an XYZ color system chromaticity diagram satisfying the following formulae under the condition of a 2° viewing angle using a standard light source D 65 : (0.038).sup.2 ≦(x-0.313).sup.2 +(25/4)·(y-0.329).sup.2 ≦(0.178).sup.2 ; y≦0.145x+0.236; and y≧-0.233x+0.376.
Claim 11
Dependent Claim
41 words
A color filter according to claim 8, wherein the light transmitted through the red color filter portion further has the chromaticity (x, y) on the XYZ color system chromaticity diagram satisfying the following formulae: (0.038).sup.2 ≦(x-0.313).sup.2 +(25/4)·(y-0.329).sup.2 ; y≦-0.233x+0.412; and x=0.420.
Claim 12
Dependent Claim
61 words
A color filter according to claim 8, wherein, when the color filter is used together with a reflector, the light transmitted through the red color filter portion after being reflected by the reflector has a value of Y in the range from 30 to 75, the value of Y being one of three stimulus values defined in the XYZ color system.
Claim 13
Dependent Claim
137 words
A color filter according to claim 8, wherein white colored light is obtained by mixing the light transmitted through the cyan color filter portion with the light transmitted through the red color filter portion, a range of a chromaticity of the white colored light being an elliptical range defined by the chromaticity (x, y) of (0.321, 0.310) as its center on the XYZ color system chromaticity diagram and having a major axis of 0.018, a minor axis of 0.014, and a tilt angle of 45°, and wherein, when the color filter is used together with a reflector, the light transmitted through the red color filter portion after being reflected by the reflector has a value of Y of 25 or more, the value of Y being one of the three stimulus values in the XYZ color system.
Claim 14
Dependent Claim
38 words
A color filter according to claim 11, wherein values x and y of the chromaticity (x, y) of the white colored light are within a range from 0.301 to 0.317 and a range from 0.310 to 0.333, respectively.
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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) | 2000-09-22 | 2001-03-24 | 2001-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-22 | 2005-03-24 | 2005-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-22 | 2009-03-24 | 2009-09-23 | $7700.00 | Window Closed / Lapsed |