US5719648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display apparatus and method for producing the same with electrodes for producing a reference signal outside display area
Assignee: Sharp Corp
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Filing: 1996-07-12
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Granted: 1998-02-17
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Expires: 2016-07-12
Abstract
Abstract A liquid crystal display apparatus includes an active matrix substrate and a counter substrate opposing the active matrix substrate via a liquid crystal layer. The active matrix substrate includes: a display portion having a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, a plurality of pixel electrodes arranged in a matrix in regions surrounded by the plurality of source lines and the plurality of gate lines, and switching elements for connecting the pixel electrodes to the source lines and the gate lines; and a first electrode provided along the source lines outside of the display portion, wherein the first electrode serves to produce a reference signal by changing a surface potential distribution of the substrate, and the positions of the plurality of pixel electrodes are determined based on the reference signal.
Inventors
- 👤 Shouji Yoshii
- 👤 Youichi Hiraishi
- 👤 Masanobu Ishii
- 👤 Yoshinori Shimada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:50
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/1306; G02F1/1309; G02F1/133; G02F1/1333; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G02F1/136; G02F1/1362; G02F1/136204; G02F1/136259; G02F1/136272; G02F2201/00; G02F2201/12; G02F2201/123; G09G2300/00; G09G2300/04; G09G2300/0421; G09G2300/043; G09G2330/00; G09G2330/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
138 words
A liquid crystal display apparatus comprising an active matrix substrate and a counter substrate opposing the active matrix substrate via a liquid crystal layer, the active matrix substrate including: a display portion having a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, a plurality of pixel electrodes arranged in a matrix in regions surrounded by the plurality of source lines and the plurality of gate lines, and switching elements for connecting the pixel electrodes to the source lines and the gate lines; and a first electrode provided along the source lines outside of the display portion, wherein the first electrode serves to produce a reference signal by changing a surface potential distribution of the substrate, and the positions of the plurality of pixel electrodes are determined based on the reference signal.
Claim 2
Dependent Claim
138 words
A liquid crystal display apparatus comprising an active matrix substrate and a counter substrate opposing the active matrix substrate via a liquid crystal layer, the active matrix substrate including: a display portion having a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, a plurality of pixel electrodes arranged in a matrix in regions surrounded by the plurality of source lines and the plurality of gate lines, and switching elements for connecting the pixel electrodes to the source lines and the gate lines; and a first electrode provided along the source lines outside of the display portion, wherein the first electrode serves to produce a reference signal by changing a surface potential distribution of the substrate, and the positions of the plurality of pixel electrodes are determined based on the reference signal.
Claim 3
Dependent Claim
23 words
A liquid crystal display apparatus according to claim 1, wherein the first electrode is a dummy electrode which is not used for display.
Claim 4
Dependent Claim
31 words
A liquid crystal display apparatus according to claim 1, wherein the first electrode is composed of a plurality of electrodes having the same structure as a structure of the pixel electrodes.
Claim 5
Dependent Claim
28 words
A liquid crystal display apparatus according to claim 1, wherein external single input terminals of the source lines are provided only on one side of the display portion.
Claim 6
Dependent Claim
36 words
A liquid crystal display apparatus according to claim 1, wherein external single input terminals of the source lines and external single input terminals of the first electrode are provided on different sides of the display portion.
Claim 7
Dependent Claim
30 words
A liquid crystal display apparatus according to claim 1, wherein at least two of the first electrodes are provided along the source lines on both sides of the display portion.
Claim 8
Dependent Claim
16 words
A liquid crystal display apparatus according to claim 1, wherein the first electrode has a strip-shape.
Claim 9
Independent Claim
154 words
A method for producing a liquid crystal display apparatus including: an active matrix substrate having a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, a plurality of pixel electrodes arranged in a matrix in regions surrounded by the plurality of source lines and the plurality of gate lines, and switching elements for connecting the pixel electrodes to the source lines and the gate lines; and a counter substrate opposing the active matrix substrate via a liquid crystal layer, the method comprising the steps of: forming a first electrode along the source lines outside the display portion; applying a voltage to an element connected to the first electrode produces a first surface potential distribution of the substrate; detecting the first surface potential distribution, thereby determining the position of the first electrode; and determining positions of the plurality of pixel electrodes based on the position of the first electrode.
Claim 10
Independent Claim
154 words
A method for producing a liquid crystal display apparatus including: an active matrix substrate having a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, a plurality of pixel electrodes arranged in a matrix in regions surrounded by the plurality of source lines and the plurality of gate lines, and switching elements for connecting the pixel electrodes to the source lines and the gate lines; and a counter substrate opposing the active matrix substrate via a liquid crystal layer, the method comprising the steps of: forming a first electrode along the source lines outside the display portion; applying a voltage to an element connected to the first electrode produces a first surface potential distribution of the substrate; detecting the first surface potential distribution, thereby determining the position of the first electrode; and determining positions of the plurality of pixel electrodes based on the position of the first electrode.
Claim 11
Dependent Claim
101 words
A method for producing a liquid crystal display apparatus according to claim 8, further comprising the steps of: applying a voltage to the plurality of pixel electrodes through the plurality of source lines to produce a second surface potential distribution of the substrate after the step of determining positions of the plurality of pixel electrodes; detecting the second surface potential distribution of the substrate; sampling a sum potential distribution of the first surface potential distribution and the second surface potential distribution; and determining the position of a defective pixel based on a sample from the sampling of the sum potential distribution.
Claim 12
Dependent Claim
27 words
A method for producing a liquid crystal display apparatus according to claim 8, wherein the first electrode is a dummy electrode which is not used for display.
Claim 13
Dependent Claim
45 words
A method for producing a liquid crystal display apparatus according to claim 8, wherein the first electrode is formed in the same step as a step of forming the pixel electrodes so as to have the same structure as a structure of the pixel electrodes.
Claim 14
Dependent Claim
25 words
A method for producing a liquid crystal display apparatus according to claim 8, wherein the first electrode is formed so as to have a strip-shape.
Claim 15
Dependent Claim
35 words
A method for producing a liquid crystal display apparatus according to claim 12, wherein the strip-shaped first electrode functions so as to protect the switching elements from static charges generated in the course of production.
Claim 16
Dependent Claim
32 words
A method for producing a liquid crystal display apparatus according to claim 8, wherein external single input terminals of the source lines are provided only on one side of the display portion.
Claim 17
Dependent Claim
40 words
A method for producing a liquid crystal display apparatus according to claim 8, wherein external single input terminals of the source lines and external single input terminals of the first electrode are provided on different sides of the display portion.
Claim 18
Dependent Claim
34 words
A method for producing a liquid crystal display apparatus according to claim 8, wherein at least two of the first electrodes are provided along the source lines on both sides of the display portion.
Claim 19
Dependent Claim
114 words
An active matrix substrate comprising: a display portion having a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, a plurality of pixel electrodes arranged in a matrix in regions surrounded by the plurality of source lines and the plurality of gate lines, and switching elements for connecting the pixel electrodes to the source lines and the gate lines; and a first electrode provided along the source lines outside of the display portion, wherein the first electrode serves to produce a reference signal by changing a surface potential distribution of the substrate, and the positions of the plurality of pixel electrodes are determined based on the reference signal.
Claim 20
Dependent Claim
114 words
An active matrix substrate comprising: a display portion having a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, a plurality of pixel electrodes arranged in a matrix in regions surrounded by the plurality of source lines and the plurality of gate lines, and switching elements for connecting the pixel electrodes to the source lines and the gate lines; and a first electrode provided along the source lines outside of the display portion, wherein the first electrode serves to produce a reference signal by changing a surface potential distribution of the substrate, and the positions of the plurality of pixel electrodes are determined based on the reference signal.
Claim 21
Dependent Claim
19 words
An active matrix substrate according to claim 17, wherein the first electrode is in the form of a strip.
Claim 22
Independent Claim
140 words
A method for inspecting an active matrix substrate including: a display portion having a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, a plurality of pixel electrodes arranged in a matrix in regions surrounded by the plurality of source lines and the plurality of gate lines, and switching elements for connecting the pixel electrodes to the source lines and the gate lines; and a first electrode provided along the source lines outside of the display portion, the method comprising the steps of: applying a voltage to an element connected to the first electrode produces a first surface potential distribution of the substrate; detecting the first surface potential distribution, thereby determining the position of the first electrode; and determining positions of the plurality of pixel electrodes based on the position of the first electrode.
Claim 23
Independent Claim
140 words
A method for inspecting an active matrix substrate including: a display portion having a plurality of source lines, a plurality of gate lines crossing the plurality of source lines, a plurality of pixel electrodes arranged in a matrix in regions surrounded by the plurality of source lines and the plurality of gate lines, and switching elements for connecting the pixel electrodes to the source lines and the gate lines; and a first electrode provided along the source lines outside of the display portion, the method comprising the steps of: applying a voltage to an element connected to the first electrode produces a first surface potential distribution of the substrate; detecting the first surface potential distribution, thereby determining the position of the first electrode; and determining positions of the plurality of pixel electrodes based on the position of the first electrode.
Claim 24
Dependent Claim
100 words
A method for inspecting an active matrix substrate according to claim 19, further comprising the steps of: applying a voltage to the plurality of pixel electrodes through the plurality of source lines to produce a second surface potential distribution of the substrate after the step of determining positions of the plurality of pixel electrodes; detecting the second surface potential distribution of the substrate; sampling a sum potential distribution of the first surface potential distribution and the second surface potential distribution; and determining the position of a defective pixel based on a sample from the sampling of the sum potential distribution.
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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) | 2001-02-16 | 2001-08-18 | 2002-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-16 | 2005-08-18 | 2006-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-16 | 2009-08-18 | 2010-02-17 | $7700.00 | Window Closed / Lapsed |