EP0525852A1
Expired / Lapsed
EP
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Display device
Assignee: Koninklijke Philips NV
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Filing: 1992-07-02
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Granted: —
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Expires: 2012-07-02
Abstract
Abstract When an active matrix LCD is driven while using inversion per n rows (n ≧ 2), stripe effects occur. In the case of double line inversion this leads to stripes in the picture. According to the invention this can be largely obviated by giving at least the last row of the rows in a group of n rows a different selection voltage.
Inventors
- 👤 Peter Bas Anton Wolfs
- 👤 Karel Elbert Kuijk
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 23:18
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/367; G09G3/3607; G09G3/3648; G09G3/3614
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A display device comprising a system of pixels arranged in rows and columns and a line selection circuit which can select rows of pixels by means of selection voltages during operation, the device also comprising a circuit for presenting column or data voltages during selection, characterized in that the line selection circuit can select consecutive rows of pixels within groups of at least two rows of pixels during operation and charges consecutive groups of pixels in the opposite sense, the line selection circuit being capable of applying a selection voltage to at least one row electrode or selection electrode at the beginning or the end of a group of rows during operation, which selection voltage differs from the other selection voltages within the group.
Claim 2
Dependent Claim
124 words
A display device comprising a system of pixels arranged in rows and columns and a line selection circuit which can select rows of pixels by means of selection voltages during operation, the device also comprising a circuit for presenting column or data voltages during selection, characterized in that the line selection circuit can select consecutive rows of pixels within groups of at least two rows of pixels during operation and charges consecutive groups of pixels in the opposite sense, the line selection circuit being capable of applying a selection voltage to at least one row electrode or selection electrode at the beginning or the end of a group of rows during operation, which selection voltage differs from the other selection voltages within the group.
Claim 3
Dependent Claim
40 words
A display device as claimed in Claim 1, characterized in that it comprises a colour filter whose colour pixels of one and the same colour in consecutive rows are shifted with respect to each other by one or more columns.
Claim 4
Dependent Claim
32 words
A display device as claimed in Claim 1 or 2, characterized in that the rows are divided into groups of two, with the possible exception of the first and the last row.
Claim 5
Dependent Claim
28 words
A display device as claimed in Claim 1, 2 or 3, characterized in that the picture electrodes are connected to the rows or columns via active switching units.
Claim 6
Dependent Claim
22 words
A display device as claimed in Claim 4, characterized in that the active switching unit comprises one or more two-poles or three-poles.
References Cited (Backward Citations)
EP0295802A1
Cited
EP0479552A2
Cited
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