Patent NL52263C successfully refreshed from Google Patents.
Patent US922484A successfully refreshed from Google Patents.
EP0366459A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of repairing liquid crystal display and apparatus using the method
Assignee: Toshiba Corp
•
Filing: 1989-10-26
•
Granted: —
•
Expires: 2009-10-26
Abstract
Abstract An apparatus for repairing a liquid crystal display comprises a common electrode (4), pixel electrodes (5-1, 5-2, ...) facing the common electrode, and a liquid crystal sealed between the common and pixel electrodes. If the liquid crystal contains foreign matter (50) which short-circuits the common and pixel electrodes (4, 5-1, 5-2, ...) to each other, a pixel electrode (4) is irradiated with a laser beam such that at least a ring line region completely surrounding a portion touching the foreign matter (50) is burnt away, whereby a region inside of the ring line region (52) and a region outside of the ring line region are electrically insulated from each other.
Inventors
- 👤 Susumu Intellectual Property Division Yahagi
- 👤 Shuichi Intellectual Property Division Ishida
- 👤 Shigeru Intellectual Property Division Fujimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 03:57
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/13439; G02F1/1306; G02F1/1309
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
A method of repairing a liquid crystal display which comprises a common electrode, pixel electrodes facing the common electrode, and a liquid crystal sealed between the common and pixel electrodes, and wherein the liquid crystal contains conductive foreign matter short-circuiting the common and pixel electrodes to each other, said method characterized by comprising the step of: irradiating a pixel electrode with a laser beam such that at least a ring-like region of said pixel electrode which corresponds to a ring line completely surrounding a portion touching the foreign matter is removed by the laser beam, whereby a region of said pixel electrode inside of the ring line region and a region of said pixel electrode outside of the ring line region are electrically insulated from each other.
Claim 2
Independent Claim
127 words
A method of repairing a liquid crystal display which comprises a common electrode, pixel electrodes facing the common electrode, and a liquid crystal sealed between the common and pixel electrodes, and wherein the liquid crystal contains conductive foreign matter short-circuiting the common and pixel electrodes to each other, said method characterized by comprising the step of: irradiating a pixel electrode with a laser beam such that at least a ring-like region of said pixel electrode which corresponds to a ring line completely surrounding a portion touching the foreign matter is removed by the laser beam, whereby a region of said pixel electrode inside of the ring line region and a region of said pixel electrode outside of the ring line region are electrically insulated from each other.
Claim 3
Independent Claim
247 words
An apparatus for repairing a liquid crystal display having a common electrode and a plurality of pixel electrodes, characterized by comprising: laser oscillating means (30) for generating a laser beam; alignment beam source means (35) for outputting an alignment beam used for alignment of the laser beam generated from said laser oscillating means; first optical means (37) for defining the laser beam and the alignment beam in such a manner that the laser beam and the alignment beam have a cross section in the form of a closed loop; XY carriage means (20) on which the liquid crystal display is mounted and which is movable in an XY plane; driving means (24) for driving the liquid crystal display; second optical means (41) for focusing the laser beam and the alignment beam, the cross sections of which are in the form of a closed loop, on a predetermined portion of the liquid crystal display; illuminating means (46) for illuminating the liquid crystal display by directing light thereto through the second optical means; image sensor means (47) image-picking up the liquid crystal display means through the second optical means, to generate an image signal; monitor means (48) for visualizing the image signal supplied from said image sensor means to allow detection of at least one of the pixel electrodes which is in contact with the foreign matter; and a region of the pixel electrode which surrounds an electrode portion touching the foreign matter being removed by the laser beam.
Claim 4
Independent Claim
247 words
An apparatus for repairing a liquid crystal display having a common electrode and a plurality of pixel electrodes, characterized by comprising: laser oscillating means (30) for generating a laser beam; alignment beam source means (35) for outputting an alignment beam used for alignment of the laser beam generated from said laser oscillating means; first optical means (37) for defining the laser beam and the alignment beam in such a manner that the laser beam and the alignment beam have a cross section in the form of a closed loop; XY carriage means (20) on which the liquid crystal display is mounted and which is movable in an XY plane; driving means (24) for driving the liquid crystal display; second optical means (41) for focusing the laser beam and the alignment beam, the cross sections of which are in the form of a closed loop, on a predetermined portion of the liquid crystal display; illuminating means (46) for illuminating the liquid crystal display by directing light thereto through the second optical means; image sensor means (47) image-picking up the liquid crystal display means through the second optical means, to generate an image signal; monitor means (48) for visualizing the image signal supplied from said image sensor means to allow detection of at least one of the pixel electrodes which is in contact with the foreign matter; and a region of the pixel electrode which surrounds an electrode portion touching the foreign matter being removed by the laser beam.
Claim 5
Dependent Claim
25 words
An apparatus according to claim 2, characterized in that the alignment beam output from said alignment beam source means (35) is a white light beam.
Claim 6
Dependent Claim
44 words
An apparatus according to claim 2, characterized in that said first optical means (37) comprises a slit plate, which includes a glass plate (39), and a metal layer (40) coated on the glass plate and having a ring slit corresponding to the closed loop.
Claim 7
Dependent Claim
28 words
An apparatus according to claim 2, characterized in that said first optical means includes a plurality of slit plates which have different-diameter ring slits and are selectively employed.
Claim 8
Dependent Claim
50 words
An apparatus according to claim 2, characterized in that said first optical means includes a prism (65) for refracting the laser beam at a predetermined angle, a rotatable housing (62) for holding the prism, a motor (68), and a belt (69) for transmitting torque of the motor to the housing.
Claim 9
Dependent Claim
52 words
An apparatus according to claim 2, characterized in that said first optical means includes a slit plate (72) having an arcuate slit; and means for rotating the slit plate by a predetermined angle. 8. An apparatus according to claim 2, characterized in that said XY carriage means is an XY table (20).
Claim 10
Dependent Claim
50 words
An apparatus according to claim 2, characterized in that said first optical means includes a dichroic mirror (42) for reflecting the laser beam and the alignment beam guided from a slit plate, and a converging lens (43) for converging the laser beam and alignment beam reflected by the dichroic mirror.
Claim 11
Dependent Claim
20 words
An apparatus according to claim 2, characterized in that said image sensor means includes a solidstate charge coupled device (47).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.