EP0501837A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A liquid crystal display device and a method of compensating for a defect of a liquid crystal panel of the liquid crystal display device
Assignee: Sharp Corp
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Filing: 1992-03-02
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Granted: —
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Expires: 2012-03-02
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 luminance point pixel is detected, a laser beam (10) is irradiated from an excimer laser oscillator on a portion in the vicinity of a surface of one of glass substrates (2, 27) of a liquid crystal panel (1) on which an illuminating light (40) is incident, the portion being located on the same irradiation path of the illuminating light with the luminance point pixel (5). In this way, the portion (16) is laser-etched, 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 (5) is scattered and so reduced. Accordingly, the luminance point pixel is inconspicuous against normal pixels (28) around the luminance point pixel (5).
Inventors
- 👤 Shunji Nakai
- 👤 Toshio Maeda
- 👤 Yasuo 1-205 Southern Hills Gakuenmae Mizokoshi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:05
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: 24
Claim 1
Independent Claim
132 words
A liquid crystal display device comprising a transmission liquid crystal panel (1) including a liquid crystal (30) enclosed between a pair of transparent substrates (2, 27) and pixels (28) for display arranged in a matrix and light source means for irradiating an illuminating light (40) for display from a back of the transmission liquid crystal panel (1), wherein a processed concave portion (18) is formed in a portion in the vicinity of a surface of one of the transparent substrates on which the illuminating light is incident, the portion being located on an irradiation path of the illuminating light irradiated on a luminance point pixel (5) having a luminance point defect, and the processed concave portion (18) has a bottom (17) which is rough so as to have a light scattering characteristic.
Claim 2
Dependent Claim
26 words
A liquid crystal display device according to claim 1, wherein the bottom of the processed concave portion (18) comprises deep steps and shallow steps arranged alternately.
Claim 3
Dependent Claim
54 words
A liquid crystal display device according to claim 1, wherein the processed concave portion (185) is formed to be narrower at the bottom thereof than at an upper opening thereof, and a side wall (171) and the bottom (170) of the processed concave portion are rough so as to have the light scattering characteristic.
Claim 4
Dependent Claim
25 words
A liquid crystal display device according to claim 3, wherein the wall (171) has a sawtooth-like roughness and the bottom (170) has a mesh-like roughness.
Claim 5
Dependent Claim
37 words
A liquid crystal display device according to claim 1, wherein the bottom of the processed concave portion is formed to have a more excellent light scattering charcteristic at a central portion thereof than an ambient portion thereof.
Claim 6
Dependent Claim
21 words
A liquid crystal display device according to claim 5, wherein the central portion of the bottom has a mesh-like roughness (172).
Claim 7
Dependent Claim
42 words
A liquid crystal display device according to claim 5, wherein the central portion of the bottom has another processed concave portion (187) which is deeper than the ambient portion and is narrower at a bottom thereof than at an upper opening thereof.
Claim 8
Dependent Claim
146 words
A liquid crystal display device comprising a transmission liquid crystal panel (1) including a liquid crystal (30) enclosed between a pair of transparent substrates (2, 27) and pixels (28) for display arranged in a matrix and light source means for irradiating an illuminating light (40) for display from a back of the transmission liquid crystal panel, wherein a processed concave portion (188) is formed in a portion in the vicinity of a surface of one of the transparent substrates on which the illuminating light is incident, the portion (188) being located on an irradiation path of the illuminating light irradiated on a luminance point pixel (5) having a luminance point defect, and the processed concave portion (188) has a bottom (17) which is deep so as to be close to the luminance point pixel (5) and is rough so as to have a light scattering characteristic.
Claim 9
Dependent Claim
46 words
A liquid crystal display device according to any one of claims 1 and 8, wherein the processed concave portion (18, 188) having the bottom (17) which is rough so as to have a light scattering characteristic is formed by the use of an excimer laser beam.
Claim 10
Dependent Claim
133 words
A liquid crystal display device comprising a transmission liquid crystal panel (1) including a liquid crystal (30) enclosed between a pair of transparent substrates (2, 27) and pixels (28) for display arranged in a matrix and light source means for irradiating an illuminating light (40) for display from a back of the transmission liquid crystal panel, wherein a processed concave portion (19) is formed in a portion in the vicinity of a surface of one of the transparent substrates from which the illuminating (40) light is outgoing, the portion being located on an irradiation path of the illuminating light (40) irradiated on a luminance point pixel (5) having a luminance point defect, and the processed concave portion (19) has a bottom (17) which is rough so as to have a luminance reducing characteristic.
Claim 11
Dependent Claim
26 words
A liquid crystal display device according to claim 10, wherein the bottom of the processed concave portion (19) comprises deep steps and shallow steps arranged alternately.
Claim 12
Dependent Claim
40 words
A liquid crystal display device according to claim 10, wherein the bottom (17) of the processed concave portion (19) is formed to have a more excellent light scattering characteristic at a central portion thereof than at an ambient portion thereof.
Claim 13
Dependent Claim
20 words
A liquid crystal display device according to claim 12, wherein the central portion of the bottom has a mesh-like roughness.
Claim 14
Independent Claim
164 words
A method for compensating of a defect of a liquid crystal display device comprising a transmission liquid crystal panel (1) including a liquid crystal (30) enclosed between a pair of transparent substrates (2, 27) and pixels (28) for display arranged in a matrix and light source means for irradiating an illuminating light (40) for display from a back of the transmission liquid crystal panel, the above method comprising the steps of: detecting a luminance point defect by irradiating the illuminating light (40) on the transmission liquid crystal display panel (1); forming a processed concave portion (18) in a portion in the vicinity of a surface of one of the transparent substrates on which the illuminating light 40 is incident, the portion (18) being located on an irradiation path of the illuminating light irradiated on a luminance point pixel (5) having a luminance point defect; and forming a rough surface (17) having a light scattering area by surface-roughening a bottom of the processed concave portion.
Claim 15
Dependent Claim
39 words
A 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 (18).
Claim 16
Independent Claim
173 words
A method of compensating for a defect of a liquid crystal display device comprising a transmission liquid crystal panel (1) including a liquid crystal (30) enclosed between a pair of transparent substrates (2, 27) and pixels (28) for display arranged in a matrix and light source means for irradiating an illuminating light (40) for display from a back of the transmission liquid crystal panel, the above method comprising the steps of: detecting a luminance point defect by irradiating the illuminating light (40) on the transmission liquid crystal display panel (1); forming a processed concave portion (185) which is narrower at a bottom thereof than an upper opening thereof in a portion in the vicinity of a surface of one of the transparent substrates on which the light is incident, the portion being located on an irradiation path of the illuminating light irradiated on a luminance point pixel (5) having a luminance point defect; and forming a light scattering area by surface-roughening a wall (171) and the bottom (170) of the processed concave portion.
Claim 17
Dependent Claim
35 words
A method of compensating for a defect of a liquid crystal display device according to claim 16, wherein the wall (171) is surface-roughened to be sawtooth-like and the bottom (170) is surface-roughened to be mesh-like.
Claim 18
Independent Claim
185 words
A method of compensating for a defect of a liquid crystal display device comprising a transmission liquid crystal panel (1) including a liquid crystal (30) enclosed between a pair of transparent substrates (2, 27) and pixels (28) for display arranged in a matrix and light source means for irradiating an illuminating light (40) for display from a back of the transmission liquid crystal panel, the above method comprising the steps of: detecting a luminance point defect by irradiating the illuminating light (40) on the transmission liquid crystal display panel (1); forming a processed concave portion (16) which has a rough bottom (17) having a light scattering characteristic by surface-roughening a portion in the vicinity of a surface of one of the transparent substrates on which the light is incident, the portion being located on an irradiation path of the illuminating light irradiated on a luminance point pixel (5) having a luminance point defect; and forming another processed concave portion (187) at a central portion of the rough bottom of the processed concave portion, the another processed concave portion (187) being deeper than the rough surface.
Claim 19
Independent Claim
167 words
A method of compensating for a defect of a liquid crystal display device comprising a transmission liquid crystal panel (1) including a liquid crystal (30) enclosed between a pair of transparent substrates (2, 27) and pixels (28) for display arranged in a matrix and light source means for irradiating an illuminating light (40) for display from a back of the transmission liquid crystal panel, the above method comprising the steps of: detecting a luminance point defect by irradiating the illuminating light (40) on the transmission liquid crystal display panel (1); and forming a processed concave portion (188) having a bottom (17) which is close to a luminance point pixel (5) having a luminance point defect and which is rough so as to have a light scattering characteristic by surface-roughening a portion in the vicinity of a surface of one of the transparent substrates on which the light is incident, the portion being located on a irradiation path of the illuminating light irradiated on the luminance point pixel.
Claim 20
Independent Claim
44 words
A 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 portion is surface-roughened by way of laser etching by the use of an excimer laser beam.
Claim 21
Dependent Claim
53 words
A method of compensating for a defect of a liquid crystal display device according to claim 20, wherein the excimer laser beam is irradiated on the 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 22
Independent Claim
164 words
A method of compensating for a defect of a liquid crystal display device comprising a transmission liquid crystal panel (1) including a liquid crystal (30) enclosed between a pair of transparent substrates (2,27) and pixels (28) for display arranged in a matrix and light source means for irradiating an illuminating light (40) for display from a back of the transmission liquid crystal panel (1), the above method comprising the steps of: detecting a luminance point defect by irradiating the illuminating light (40) on the transmission liquid crystal display panel (1); and forming a processed concave portion (19) in a portion in the vicinity of a surface of one of the transparent substrates from which the illuminating light is outgoing, the portion (19) being located on an irradiation path of the illuminating light irradiated on a luminance point pixel having a luminance point defect and surface-roughening a bottom (17) of the processed concave portion (19) to form a rough surface having a luminance reducing area.
Claim 23
Dependent Claim
38 words
A 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 24
Dependent Claim
30 words
A 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)
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