Patent EP0375233A2 successfully refreshed from Google Patents.
EP0375233A2
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EP
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Active matrix type display device
Assignee: Seiko Epson Corp
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Filing: 1989-12-11
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Granted: —
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Expires: 2009-12-11
Abstract
Abstract An active matrix type display device has a plurality of scanning lines (Y1, ... Yn), a plurality of signal lines (X1, ... Xm), and pixels (10, 30, 40, 50, 60) disposed at inter-sections of the scanning lines and the signal lines for providing a display. Each pixel is driven by way of a respective plurality of thin film transistors (1, 2, 23, 24, 31, 32, 33, 41, 42, 51, 52) which are connected to an associated pixel electrode (P). Each pixel electrode also has connected thereto a respective plurality of storage capacitors (5, 6, 25, 26, 27, 37, 38, 45, 46, 47, 55, 56, 57) arranged in parallel. Thus, if a thin film transistor or a storage capacitor connected to one of the pixel electrodes is defective, the defect in the associated pixel can be relieved simply by disconnecting as a pair both one of the thin film transistors and at least one of the storage capacitors so long as the pair includes the defective element.
Inventors
- 👤 Yojiro Matsueda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 14:11
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/13624; G02F1/136213; H; H10; H10D; H10D86/00; H10D86/40; H10D86/481; H10D86/60; G02F1/136259; G02F1/136268
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
110 words
An active matrix type display device having a plurality of scanning lines (Y1, ... Yn), a plurality of signal lines (X1, ... Xm), and pixels (10, 30, 40, 50, 60) disposed at inter-sections of the scanning lines and the signal lines for providing a display, each pixel being driven by way of a respective plurality of thin film transistors (1, 2, 23, 24, 31, 32, 33, 41, 42, 51, 52) which are connected to an associated pixel electrode (P), characterised in that each pixel electrode has connected thereto a respective plurality of storage capacitors (5, 6, 25, 26, 27, 37, 38, 45, 46, 47, 55, 56, 57) arranged in parallel.
Claim 2
Dependent Claim
110 words
An active matrix type display device having a plurality of scanning lines (Y1, ... Yn), a plurality of signal lines (X1, ... Xm), and pixels (10, 30, 40, 50, 60) disposed at inter-sections of the scanning lines and the signal lines for providing a display, each pixel being driven by way of a respective plurality of thin film transistors (1, 2, 23, 24, 31, 32, 33, 41, 42, 51, 52) which are connected to an associated pixel electrode (P), characterised in that each pixel electrode has connected thereto a respective plurality of storage capacitors (5, 6, 25, 26, 27, 37, 38, 45, 46, 47, 55, 56, 57) arranged in parallel.
Claim 3
Dependent Claim
43 words
A display device according to claim 1 characterised in that the thin film transistors and the storage capacitors are arranged so as to permit selective disconnection of the same from the respective pixel electrodes if the operation of an associated pixel is defective.
Claim 4
Dependent Claim
80 words
A display device according to claim 1 or 2 characterised in that the arrangement is such that a drive voltage applied to a particular pixel following disconnection of a selected one or a plurality of the thin film transistors connected to the associated pixel electrode and a corresponding selected one or a plurality of the storage capacitors connected to the associated pixel electrode is substantially the same as the drive voltage applied to the other pixels for providing a display.
Claim 5
Dependent Claim
150 words
A display device according to claim 2 or 3 characterised in that the thin film transistors and the storage capacitors connected to each pixel electrode are arranged to permit the selective disconnection of the i-th thin film transistor and one or a plurality of the storage capacitors having a total capacitance Cp if said i-th thin film transistor or said one or a plurality of storage capacitors having said total capacitance Cp is defective, where there are a number n of the thin film transistors connected to the pixel electrode and where Cp = (C0 + Cs) x Ci / (Ci + Cn-1) with Ci being the gate-drain capacitance of the i-th thin film transistor, Cn-1 being the gate-drain capacitance of the remaining n-1 thin film transistors, C0 being the capacitance of electro-optic material of the pixel, and Cs being the total capacitance of the storage capacitors of the pixel.
Claim 6
Dependent Claim
60 words
A display device according to any preceding claim characterised in that the thin film transistors (102, 103, 104, 105) and the pixel electrodes (101) are formed on a substrate (110), and in that the join between each of the thin film transistors and the associated pixel electrode has a width smaller than the channel width of the thin film transistor.
Claim 7
Dependent Claim
63 words
A display device according to any preceding claim characterised in that the storage capacitors connected to each of the pixel electrodes each comprise a respective storage capacitor electrode (111, 112) and the pixel electrode (101) mounted on a substrate (110), and in that the join between the storage capacitor electrodes has a width which is smaller than the width of the pixel electrode.
Claim 8
Independent Claim
174 words
A method of correcting for defects in a display provided by an active matrix type display device having a plurality of scanning lines (Y1, ... Yn), a plurality of signal lines (X1, ... Xm), and pixels (10, 30, 40, 50, 60) disposed at inter-sections of the scanning lines and the signal lines for providing the display, wherein each pixel is driven by way of a respective plurality of thin film transistors (1, 2, 23, 24, 31, 32, 33, 41, 42, 51, 52) connected to an associated pixel electrode (P), the method being characterised by providing a respective plurality of storage capacitors (5, 6, 25, 26, 27, 37, 38, 45, 46, 47, 55, 56, 57) arranged in parallel connected to each pixel electrode, and disconnecting a selected one or a plurality of the thin film transistors connected to a respective pixel element and a corresponding selected one or a plurality of the storage capacitors connected to the respective pixel element in the event that the operation of the associated pixel is found to be defective.
Claim 9
Independent Claim
174 words
A method of correcting for defects in a display provided by an active matrix type display device having a plurality of scanning lines (Y1, ... Yn), a plurality of signal lines (X1, ... Xm), and pixels (10, 30, 40, 50, 60) disposed at inter-sections of the scanning lines and the signal lines for providing the display, wherein each pixel is driven by way of a respective plurality of thin film transistors (1, 2, 23, 24, 31, 32, 33, 41, 42, 51, 52) connected to an associated pixel electrode (P), the method being characterised by providing a respective plurality of storage capacitors (5, 6, 25, 26, 27, 37, 38, 45, 46, 47, 55, 56, 57) arranged in parallel connected to each pixel electrode, and disconnecting a selected one or a plurality of the thin film transistors connected to a respective pixel element and a corresponding selected one or a plurality of the storage capacitors connected to the respective pixel element in the event that the operation of the associated pixel is found to be defective.
Claim 10
Dependent Claim
21 words
A method according to claim 7 characterised in that a defect in the operation of a respective pixel is detected electrically.
Claim 11
Dependent Claim
21 words
A method according to claim 7 characterised in that a defect in the operation of a respective pixel is detected optically.
Claim 12
Dependent Claim
150 words
An electro-optic display device having an electro-optic material sandwiched between a pair of substrates, an opposing electrode formed on one of said substrates, a plurality of scanning lines (Y1, ... Yn) and a plurality of signal lines (X1, ... Xm), which are arranged in a matrix on the other substrate, a thin film transistor (1, 2, 23, 24, 31, 32, 33, 41, 42, 51, 52) provided at each of the inter-sections between said scanning and signal lines and connected to the corresponding scanning and signal lines, a pixel electrode (P) connected to said thin film transistor, and a storage capacitor (5, 6, 25, 26, 27, 37, 38, 45, 46, 47, 55, 56, 57) connected to said pixel electrode, characterised in that each pixel electrode is connected to a parallel connection of a plurality of the thin film transistors and to a parallel connection of a plurality of the storage capacitors.
Claim 13
Dependent Claim
150 words
An electro-optic display device having an electro-optic material sandwiched between a pair of substrates, an opposing electrode formed on one of said substrates, a plurality of scanning lines (Y1, ... Yn) and a plurality of signal lines (X1, ... Xm), which are arranged in a matrix on the other substrate, a thin film transistor (1, 2, 23, 24, 31, 32, 33, 41, 42, 51, 52) provided at each of the inter-sections between said scanning and signal lines and connected to the corresponding scanning and signal lines, a pixel electrode (P) connected to said thin film transistor, and a storage capacitor (5, 6, 25, 26, 27, 37, 38, 45, 46, 47, 55, 56, 57) connected to said pixel electrode, characterised in that each pixel electrode is connected to a parallel connection of a plurality of the thin film transistors and to a parallel connection of a plurality of the storage capacitors.
References Cited (Backward Citations)
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