Patent US5280374A successfully refreshed from Google Patents.
US5280374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display device and method of compensating for a defect
Assignee: Sharp Corp
•
Filing: 1992-02-28
•
Granted: 1994-01-18
•
Expires: 2012-02-28
Abstract
Abstract A liquid crystal display device and a method of compensating for a luminance point defect of the liquid crystal display device. After a detective luminance point pixel is detected, a laser beam is irradiated from an excimer laser oscillator on a portion of a surface of one of glass substrates of a liquid crystal panel on which an illuminating light is incident, the portion being located on the same irradiation path of the illuminating light with the luminance point pixel. In this way, the portion is laseretched, thereby forming a rough surface in the portion. When such a panel is used in a projection device, the light transmitted through the luminance point pixel is scattered and so reduced. Accordingly, the defective luminance point pixel is inconspicuous to normal pixels around the defective luminance point pixel.
Inventors
- 👤 Shunji Nakai
- 👤 Toshio Maeda
- 👤 Yasuo Mizokoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:46
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1306; G02F1/1309; G02F1/136; G02F1/1362; G02F1/136259; G02F1/136268; G02F2201/00; G02F2201/50; G02F2201/506; G02F2201/508
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
114 words
A liquid crystal display device comprising a transmission liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, wherein a processed concave portion is formed in a surface of one of the transparent substrates on which light from the light source means is incident, the portion being located in an irradiation path of the light illuminating a luminance point pixel having a luminance point defect, and the processed concave portion has a bottom which is rough so as to have a light scattering characteristic.
Claim 2
Dependent Claim
114 words
A liquid crystal display device comprising a transmission liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, wherein a processed concave portion is formed in a surface of one of the transparent substrates on which light from the light source means is incident, the portion being located in an irradiation path of the light illuminating a luminance point pixel having a luminance point defect, and the processed concave portion has a bottom which is rough so as to have a light scattering characteristic.
Claim 3
Dependent Claim
25 words
The liquid crystal display device according to claim 1, wherein the bottom of the processed concave portion comprises deep steps and shallow steps arranged alternately.
Claim 4
Dependent Claim
48 words
The liquid crystal display device according to claim 1, wherein the processed concave portion is narrower at the bottom thereof than at an upper opening thereof, and a side wall and the bottom of the processed concave portion are rough so as to have the light scattering characteristic.
Claim 5
Dependent Claim
24 words
The liquid crystal display device according to claim 3, wherein the side wall has a sawtooth-like roughness and the bottom has a mesh-like roughness.
Claim 6
Dependent Claim
40 words
The liquid crystal display device according to claim 1, wherein the bottom of the processed concave portion is formed to have a light scattering characteristic which is greater at a central portion thereof than that at an ambient portion thereof.
Claim 7
Dependent Claim
25 words
The liquid crystal display device according to claim 5, wherein the central portion of the bottom of the processed concave portion has a mesh-like roughness.
Claim 8
Dependent Claim
51 words
The liquid crystal display device according to claim 5, wherein the central portion of the bottom of the processed concave portion has a second processed concave portion therein which is deeper than the ambient portion, and is tapered to be narrower at a deepest end than at an upper opening thereof.
Claim 9
Dependent Claim
131 words
The liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, wherein a processed concave portion is formed in a portion of a surface of one of the transparent substrates on which light from the light source means is incident, the portion being located in an irradiation path of the light illuminating a luminance point pixel having a luminance point defect, and the processed concave portion has a bottom at a depth sufficient to be proximate to the luminance point pixel, wherein said bottom is rough so as to have a light scattering characteristic.
Claim 10
Dependent Claim
131 words
The liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, wherein a processed concave portion is formed in a portion of a surface of one of the transparent substrates on which light from the light source means is incident, the portion being located in an irradiation path of the light illuminating a luminance point pixel having a luminance point defect, and the processed concave portion has a bottom at a depth sufficient to be proximate to the luminance point pixel, wherein said bottom is rough so as to have a light scattering characteristic.
Claim 11
Dependent Claim
43 words
The liquid crystal display device according to any one of claims 1 and 8, wherein the processed concave portion having the bottom which is rough so as to have a light scattering characteristic is formed by the use of an excimer laser beam.
Claim 12
Dependent Claim
121 words
A liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, wherein a processed concave portion is formed in a surface of one of the transparent substrates from which light from the light source means is outgoing, the portion being located in an irradiation path of the light illuminating a luminance point pixel having a luminance point defect, and wherein the processed concave portion has a bottom which is rough so as to minimize an amount of light emitted from the luminance point defect.
Claim 13
Dependent Claim
121 words
A liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, wherein a processed concave portion is formed in a surface of one of the transparent substrates from which light from the light source means is outgoing, the portion being located in an irradiation path of the light illuminating a luminance point pixel having a luminance point defect, and wherein the processed concave portion has a bottom which is rough so as to minimize an amount of light emitted from the luminance point defect.
Claim 14
Dependent Claim
25 words
The liquid crystal display device according to claim 10, wherein the bottom of the processed concave portion comprises deep steps and shallow steps arranged alternately.
Claim 15
Dependent Claim
40 words
The liquid crystal display device according to claim 10, wherein the bottom of the processed concave portion is formed to have a light scattering characteristic which is greater at a central portion thereof than that at an ambient portion thereof.
Claim 16
Dependent Claim
20 words
The liquid crystal display device according to claim 12, wherein the central portion of the bottom has a mesh-like roughness.
Claim 17
Independent Claim
139 words
A method for compensating for a defect of a liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, the method comprising the steps of: detecting a luminance point defect by illuminating the transmissive liquid crystal display pane; forming a processed concave portion in a surface of one of the transparent substrates on which light from the light source means is incident, the portion being located in an irradiation path of the light illuminating the luminance point pixel having a luminance point defect; and forming a rough surface having a light scattering area by surface-roughening a bottom of the processed concave portion.
Claim 18
Independent Claim
139 words
A method for compensating for a defect of a liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, the method comprising the steps of: detecting a luminance point defect by illuminating the transmissive liquid crystal display pane; forming a processed concave portion in a surface of one of the transparent substrates on which light from the light source means is incident, the portion being located in an irradiation path of the light illuminating the luminance point pixel having a luminance point defect; and forming a rough surface having a light scattering area by surface-roughening a bottom of the processed concave portion.
Claim 19
Dependent Claim
38 words
The method of compensating for a defect of a liquid crystal display device according to claim 14, further comprising a step of forming deep steps and shallow steps arranged alternately on the bottom of the processed concave portion.
Claim 20
Independent Claim
157 words
A method of compensating for a defect of a liquid crystal display device comprising a transmissive liquid crystal a panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, the method comprising the steps of: detecting a luminance point defect by illuminating the transmissive liquid crystal display panel; forming a processed concave portion which is narrower at a bottom thereof than at an upper opening thereof in a portion of a surface of one of the transparent substrates on which light from the light source means is incident, the processed concave portion being located in an irradiation path of the light illuminating a luminance point pixel having the luminance point defect; and forming a light scattering area by surface-roughening a wall and the bottom of the processed concave portion.
Claim 21
Independent Claim
157 words
A method of compensating for a defect of a liquid crystal display device comprising a transmissive liquid crystal a panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, the method comprising the steps of: detecting a luminance point defect by illuminating the transmissive liquid crystal display panel; forming a processed concave portion which is narrower at a bottom thereof than at an upper opening thereof in a portion of a surface of one of the transparent substrates on which light from the light source means is incident, the processed concave portion being located in an irradiation path of the light illuminating a luminance point pixel having the luminance point defect; and forming a light scattering area by surface-roughening a wall and the bottom of the processed concave portion.
Claim 22
Dependent Claim
33 words
The method of compensating for a defect of a liquid crystal display device according to claim 16, wherein the wall is surface-roughened to be sawtooth-like and the bottom is surface-roughened to be mesh-like.
Claim 23
Independent Claim
169 words
A method of compensating for a defect of a liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, the method comprising the steps of: detecting a luminance point defect by illuminating the transmissive liquid crystal display panel; forming a processed concave portion which has a rough bottom having a light scattering characteristic by surface-roughening a portion of a surface of one of the transparent substrates on which light from the light source means is incident, the portion being located in an irradiation path of the light illuminating the luminance point pixel having a luminance point defect; and forming another processed concave portion at a central portion of the rough bottom of the processed concave portion, the another processed concave portion being deeper than the rough surface of the processed concave portion.
Claim 24
Independent Claim
169 words
A method of compensating for a defect of a liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, the method comprising the steps of: detecting a luminance point defect by illuminating the transmissive liquid crystal display panel; forming a processed concave portion which has a rough bottom having a light scattering characteristic by surface-roughening a portion of a surface of one of the transparent substrates on which light from the light source means is incident, the portion being located in an irradiation path of the light illuminating the luminance point pixel having a luminance point defect; and forming another processed concave portion at a central portion of the rough bottom of the processed concave portion, the another processed concave portion being deeper than the rough surface of the processed concave portion.
Claim 25
Independent Claim
155 words
A method of compensating for a defect of a liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, the method comprising the steps of: detecting a luminance point defect by illuminating the transmissive liquid crystal display panel; and forming a processed concaved portion having a bottom which is close to a luminance point pixel having a luminance point defect and which is rough so as to have a light scattering characteristic by surface-roughening a portion of a surface of one of the transparent substrates on which light from the light source means is incident, the surface-roughened portion being located in an irradiation path of the light incident on the luminance point pixel having the luminance point defect.
Claim 26
Independent Claim
155 words
A method of compensating for a defect of a liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, the method comprising the steps of: detecting a luminance point defect by illuminating the transmissive liquid crystal display panel; and forming a processed concaved portion having a bottom which is close to a luminance point pixel having a luminance point defect and which is rough so as to have a light scattering characteristic by surface-roughening a portion of a surface of one of the transparent substrates on which light from the light source means is incident, the surface-roughened portion being located in an irradiation path of the light incident on the luminance point pixel having the luminance point defect.
Claim 27
Independent Claim
46 words
The method of compensating for a defect of a liquid crystal display device according to any one of claims 14, 15, 16, 17, 18 and 19, wherein the processed concave portion is surface-roughened by way of laser etching by the use of an excimer laser beam.
Claim 28
Dependent Claim
52 words
The method of compensating for a defect of a liquid crystal display device according to claim 20, wherein the excimer laser beam is irradiated on a defect compensation area by way of reduction-slit-exposure through a slit pattern having a slit of an enlarged shape of an outline of the defect compensation area.
Claim 29
Independent Claim
139 words
A method of compensating for a defect of a liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, the method comprising the steps of: detecting a luminance point defect by illuminating the transmissive liquid crystal display panel; and forming a processed concave portion in a surface of one of the transparent substrates from which light from light source means is outgoing, the portion being located in an irradiation path of the light illuminating a luminance, point pixel having the luminance point defect and surface-roughening a bottom of the processed concave portion to make a rough surface having a luminance reducing characteristic.
Claim 30
Independent Claim
139 words
A method of compensating for a defect of a liquid crystal display device comprising a transmissive liquid crystal panel including a liquid crystal enclosed between a pair of transparent substrates and pixels for a display arranged in a matrix and light source means for illuminating the display from a back of the transmissive liquid crystal panel, the method comprising the steps of: detecting a luminance point defect by illuminating the transmissive liquid crystal display panel; and forming a processed concave portion in a surface of one of the transparent substrates from which light from light source means is outgoing, the portion being located in an irradiation path of the light illuminating a luminance, point pixel having the luminance point defect and surface-roughening a bottom of the processed concave portion to make a rough surface having a luminance reducing characteristic.
Claim 31
Dependent Claim
38 words
The method of compensating for a defect of a liquid crystal display device according to claim 22, further comprising a step of forming deep steps and shallow steps arranged alternately on the bottom of the processed concave portion.
Claim 32
Dependent Claim
30 words
The method of compensating for a defect of a liquid crystal display device according to claim 22, wherein the portion is surface-roughened by the use of an excimer laser beam:
References Cited (Backward Citations)
JPS60243635A
Cited
JPS6468723A
Cited
JPH02127614A
Cited
EP0404072A2
Cited
US5142386A
Cited
US5121236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-17 | 1997-07-19 | 1998-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-17 | 2001-07-19 | 2002-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-17 | 2005-07-19 | 2006-01-18 | $7700.00 | Window Closed / Lapsed |