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US5019001A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for manufacturing liquid crystal display device

Assignee: Toshiba Corp
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Filing: 1989-12-20
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Granted: 1991-05-28
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Expires: 2009-12-20
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Abstract

Abstract In a method for manufacturing a liquid crystal display device, address and data lines are provided over a substrate, and a short-circuit area and an area to be made short-circuit are provided to cause short-circuiting between the address and data lines. It is prevented a TFT array from dielectric breakdown by static electricity in manufacturing processes, and examination is made for a connection breakage, and short-circuiting, at a TFT array for the liquid crystal display device, prior to the manufacturing step by cutting the short-circuit. Moreover, it can be presented from dielectric breakdown by static electricity in later processes to short the area to be made short-circuit after the examination. It is possible to both decrease a faults percentage of liquid crystal devices and improve their productivity.

Inventors

  • 👤 Masanori Abe
  • 👤 Yoshiaki Komatsubara
  • 👤 Tsuyoshi Iyama

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 11:31
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1306; G02F1/1309; G02F1/1333; G02F1/1345; G02F1/136; G02F1/1362; G02F1/136204; G02F1/136254

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 211 words
A method for manufacturing a liquid crystal display device, comprising the steps of: (a) forming a plurality of address lines and a plurality of data lines, in an intersecting fashion, over a first substrate; (b) forming at least on short-circuit line for short-circuiting the address and data lines; (c) forming at least one area to be made short-circuit having two short-circuit electrodes connected to the short-circuit lines of the address and data lines, the two short-circuit electrodes being located opposite to each other with an insulating film formed therebetween; (d) exposing, subsequent to forming the short-circuit line, a spot between the short-circuit lines of the address and data lines to a laser beam and cutting the short-circuit line; (e) examining, subsequent to the exposing and cutting step (d), the presence or absence of a connection breakage and that of short-circuiting; (f) subsequent to the step (e), exposing the area to be made short-circuit to a laser beam to make short-circuiting between the two short-circuit electrodes; (g) forming a electrode on a second substrate; (h) sealing a liquid crystal composition between the first and second substrate; and (i) subsequent to making a short-circuit between the two short-circuit electrodes but prior to completing the liquid crystal display element, cutting off the short-circuit electrodes.
Claim 2
Independent Claim 211 words
A method for manufacturing a liquid crystal display device, comprising the steps of: (a) forming a plurality of address lines and a plurality of data lines, in an intersecting fashion, over a first substrate; (b) forming at least on short-circuit line for short-circuiting the address and data lines; (c) forming at least one area to be made short-circuit having two short-circuit electrodes connected to the short-circuit lines of the address and data lines, the two short-circuit electrodes being located opposite to each other with an insulating film formed therebetween; (d) exposing, subsequent to forming the short-circuit line, a spot between the short-circuit lines of the address and data lines to a laser beam and cutting the short-circuit line; (e) examining, subsequent to the exposing and cutting step (d), the presence or absence of a connection breakage and that of short-circuiting; (f) subsequent to the step (e), exposing the area to be made short-circuit to a laser beam to make short-circuiting between the two short-circuit electrodes; (g) forming a electrode on a second substrate; (h) sealing a liquid crystal composition between the first and second substrate; and (i) subsequent to making a short-circuit between the two short-circuit electrodes but prior to completing the liquid crystal display element, cutting off the short-circuit electrodes.
Claim 3
Dependent Claim 36 words
The method according to claim 1, wherein said area to be made short-circuit is formed in the neighborhoods of corners where the short-circuit line of said address line is connected to that of said data line.
Claim 4
Independent Claim 295 words
A method for manufacturing a liquid crystal display device, comprising the steps of: (a) forming a plurality of address lines and a plurality of data lines in an intersecting fashion over a first substrate; (b) forming a short-circuit line for short-circuiting the address and data lines; (c) forming at least two area to be made short-circuit having two short-circuit electrodes connected to the short-circuit lines of the address and data lines at the neighborhoods of corners, the two short-circuit electrodes being located opposite to each other with an insulating film formed therebetween; (d) exposing, subsequent to the step (b), a spot between the short-circuit lines of the address and data lines to a laser beam and cutting the short-circuit line; (e) examining, subsequent to the exposing and cutting step, the presence or absence of a connection breakage and that of short-circuiting; (f) subsequent to the examining step, exposing one area to be made short-circuit to a laser beam to cause short-circuiting between the two associated electrodes; (g) subsequent to coating an orientation film on the first substrate, and performing a rubbing step, the two associated short-circuit electrodes be exposed to a laser beam to cut the short-circuit line; (h) subsequent to the cutting step (g), making examination for a connection breakage and short-circuiring between the address and data lines; (i) subsequent to the examining step (h), exposing the other area to be made short-circuit to a laser beam to again performing short-circuiting between the two short-circuit electrodes; (j) forming a electrode on a second substrate; (k) assembling a liquid crystal cell; (l) sealing a liquid crystal composition between the first and second substrates; and (m) subsequent to the short-circuiting step (i) but prior to completing the liquid crystal display device, cutting off the short-circuit electrodes.
Claim 5
Independent Claim 295 words
A method for manufacturing a liquid crystal display device, comprising the steps of: (a) forming a plurality of address lines and a plurality of data lines in an intersecting fashion over a first substrate; (b) forming a short-circuit line for short-circuiting the address and data lines; (c) forming at least two area to be made short-circuit having two short-circuit electrodes connected to the short-circuit lines of the address and data lines at the neighborhoods of corners, the two short-circuit electrodes being located opposite to each other with an insulating film formed therebetween; (d) exposing, subsequent to the step (b), a spot between the short-circuit lines of the address and data lines to a laser beam and cutting the short-circuit line; (e) examining, subsequent to the exposing and cutting step, the presence or absence of a connection breakage and that of short-circuiting; (f) subsequent to the examining step, exposing one area to be made short-circuit to a laser beam to cause short-circuiting between the two associated electrodes; (g) subsequent to coating an orientation film on the first substrate, and performing a rubbing step, the two associated short-circuit electrodes be exposed to a laser beam to cut the short-circuit line; (h) subsequent to the cutting step (g), making examination for a connection breakage and short-circuiring between the address and data lines; (i) subsequent to the examining step (h), exposing the other area to be made short-circuit to a laser beam to again performing short-circuiting between the two short-circuit electrodes; (j) forming a electrode on a second substrate; (k) assembling a liquid crystal cell; (l) sealing a liquid crystal composition between the first and second substrates; and (m) subsequent to the short-circuiting step (i) but prior to completing the liquid crystal display device, cutting off the short-circuit electrodes.
Claim 6
Independent Claim 132 words
A method for manufacturing a liquid crystal display device comprising the steps of: (a) forming a plurality of address lines and a plurality of data lines, in an intersecting fashion, over a first substrate; (b) examining the presence or absence of a connection breakage within the address and data lines, and that of short-circuiting between the address and data lines; (c) forming a electrode on a second substrate; (d) sealing a liquid crystal composition between the first and second substrates, and wherein, (e) subsequent to the step (a), said address and data lines are, each, formed of a U-shape with the two adjacent lines arranged in an interdigital fashion; and, (f) forming a plurality of short-circuit lines in a manner to have the plurality of address lines connected in a single array.
Claim 7
Independent Claim 132 words
A method for manufacturing a liquid crystal display device comprising the steps of: (a) forming a plurality of address lines and a plurality of data lines, in an intersecting fashion, over a first substrate; (b) examining the presence or absence of a connection breakage within the address and data lines, and that of short-circuiting between the address and data lines; (c) forming a electrode on a second substrate; (d) sealing a liquid crystal composition between the first and second substrates, and wherein, (e) subsequent to the step (a), said address and data lines are, each, formed of a U-shape with the two adjacent lines arranged in an interdigital fashion; and, (f) forming a plurality of short-circuit lines in a manner to have the plurality of address lines connected in a single array.
Claim 8
Dependent Claim 35 words
The method according to claim 4, wherein, in said step (f), n-th and (n+2)-th address lines which are counted from an end are connected by a short-circuit line to each other, where n=a natural number.
Claim 9
Independent Claim 132 words
A method for manufacturing a liquid crystal display device, comprising the steps of: (a) forming a plurality of address lines and a plurality of data lines, in an intersecting fashion, over a first substrate; (b) examining the presence or absence of a connection breakage within the address and data lines, and that of short-circuiting between the address and data lines; (c) forming a electrode over a second substrate; and (d) sealing a liquid crystal composition between the first and second substrate, wherein, (e) in said step (a), said gate and data lines are so formed as to have a U-shape, each, with the respective U-shaped address and data lines arranged in an interdigital fashion; and (f) a plurality of short-circuit lines are so provided as to be connected as a single array.
Claim 10
Independent Claim 132 words
A method for manufacturing a liquid crystal display device, comprising the steps of: (a) forming a plurality of address lines and a plurality of data lines, in an intersecting fashion, over a first substrate; (b) examining the presence or absence of a connection breakage within the address and data lines, and that of short-circuiting between the address and data lines; (c) forming a electrode over a second substrate; and (d) sealing a liquid crystal composition between the first and second substrate, wherein, (e) in said step (a), said gate and data lines are so formed as to have a U-shape, each, with the respective U-shaped address and data lines arranged in an interdigital fashion; and (f) a plurality of short-circuit lines are so provided as to be connected as a single array.
Claim 11
Dependent Claim 57 words
The method according to claim 6, wherein, in said step (f), n-th and (n+2)-th address lines which are counted from an end are connected as a single array to each other wherein n=a natural number, and the address and data lines are connected by a corresponding short-circuit line to each other to provide a single line array.

References Cited (Backward Citations)

US4296372A Cited
US4455739A Cited
US4820222A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-05-27 1994-11-26 1995-05-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-05-27 1998-11-26 1999-05-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-05-27 2002-11-26 2003-05-28 $7700.00 Window Closed / Lapsed

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