EP0391655A2
Expired / Lapsed
EP
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A drive device for driving a matrix-type LCD apparatus
Assignee: Sharp Corp
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Filing: 1990-04-03
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Granted: —
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Expires: 2010-04-03
Abstract
Abstract A drive device for driving a matrix-type LCD apparatus is disclosed. The drive device comprises a signal electrode drive circuit for converting an input digital video signal into a voltage signal having one of predetermined plural levels, and supplying the voltage signal to one of the signal electrodes. The signal electrode drive circuit comprises: a video signal memory (30) for storing the input digital video signals; a data decoder (40) for decoding the information contained in the stored digital video signals; a voltage signal supply circuit (50) for outputting a plurality of voltage signals with different levels; and a selection circuit (55) for selecting one of the plurality of voltage signals in accordance with the output of the data decoding circuit.
Inventors
- 👤 Yoshiharu Kanatani
- 👤 Hirofumi Fukuoka
- 👤 Shigeyuki Uehira
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:42
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/127; G09G3/2007; G09G3/2011; G09G3/3611; G09G3/3614; G09G3/3648; G09G3/3659; G09G3/3674; G09G3/3677; G09G3/3685; G09G3/3688; G09G3/3696; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/027; G09G2310/0283; G09G2310/0289; G09G2320/00; G09G2320/02; G09G2320/0247
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
62 words
A drive device for driving a display apparatus having a display unit which includes a plurality of signal electrodes arranged in juxtaposition, said drive device being characterised by a signal electrode drive means for converting an input digital video signal into a voltage signal having one of predetermined plural levels, and for supplying said voltage signal to one of said signal electrodes.
Claim 2
Dependent Claim
62 words
A drive device for driving a display apparatus having a display unit which includes a plurality of signal electrodes arranged in juxtaposition, said drive device being characterised by a signal electrode drive means for converting an input digital video signal into a voltage signal having one of predetermined plural levels, and for supplying said voltage signal to one of said signal electrodes.
Claim 3
Dependent Claim
89 words
A drive device according to claim 1, wherein said signal electrode drive means comprises: a video signal memory means (30) for storing said input digital video signals; a data decoding means (40) for decoding the information contained in said digital video signals which are stored in said memory means; a voltage signal supply means (50) for outputting a plurality of voltage signals with different levels; and a selection menas (55) for selecting one of said plurality of voltage signals in accordance with the output of said data decoding means.
Claim 4
Dependent Claim
25 words
A drive device according to claim 2, wherein said video signal memory means stores said digital video signals for at least one horizontal scanning period.
Claim 5
Dependent Claim
15 words
A drive device according to claim 1, wherein said voltage signals are DC voltage signals.
Claim 6
Dependent Claim
108 words
A drive device for driving a display apparatus having a display unit which includes a plurality of signal electrodes arranged in juxtaposition and at least one counter electrode, said drive device being characterised by: a voltage signal supply means for outputting a plurality of voltage signals with different levels, said plurality of voltage signals having alternately positive and negative levels with respect to the level of the voltage applied to said counter electrode; and a signal electrode drive means for selecting one of said plurality of voltage signals in accordance with an input digital video signal, and supplying said selected voltage signal to one of said signal electrodes.
Claim 7
Dependent Claim
108 words
A drive device for driving a display apparatus having a display unit which includes a plurality of signal electrodes arranged in juxtaposition and at least one counter electrode, said drive device being characterised by: a voltage signal supply means for outputting a plurality of voltage signals with different levels, said plurality of voltage signals having alternately positive and negative levels with respect to the level of the voltage applied to said counter electrode; and a signal electrode drive means for selecting one of said plurality of voltage signals in accordance with an input digital video signal, and supplying said selected voltage signal to one of said signal electrodes.
Claim 8
Dependent Claim
55 words
A drive device according to claim 5, wherein each of the periods of said positive level and periods of said negative level corresponds to one horizontal scanning period, and the relationship between the levels in horiziontal scanning periods during one frame is inverted in corresponding horizontal scanning periods during the frame following said one frame.
Claim 9
Dependent Claim
83 words
A drive device according to claim 5, wherein said signal electrode drive means comprises: a video signal memory means for storing said input digital video signals; a data decoding means for decoding the information contained in said digital video signals which are stored in said memory means; and a selection means for selecting one of said plurality of voltage signals in accordance with the output of said data decoding means, and for supplying said selected voltage signal to one of said signal electrodes.
Claim 10
Dependent Claim
158 words
A drive device for driving a display apparatus having a display unit which includes a plurality of signal electrodes arranged in juxtaposition; a plurality of scanning electrodes intersecting said signal electrodes; a plurality of pixel electrodes which are disposed respectively at the intersections of said signal electrodes and said scanning electrodes; at least one counter electrode opposing said pixel electrodes; and supplemental capacitance electrodes for forming capacitors in co-operation with said pixel electrodes, said drive device being characterised by: a signal electrode drive means for AC-driving said signal electrodes; a voltage apply means for applying an AC voltage to said counter electrode, the phase of said AC voltage being different from that of the AC-drive of said signal electrodes, the level of said AC voltage varying with respect to a predetermined reference voltage; and a supplemental capacitance electrode drive means for driving said supplemental electrodes, the drive of said supplemental electrodes being in phase with said AC voltage.
Claim 11
Dependent Claim
158 words
A drive device for driving a display apparatus having a display unit which includes a plurality of signal electrodes arranged in juxtaposition; a plurality of scanning electrodes intersecting said signal electrodes; a plurality of pixel electrodes which are disposed respectively at the intersections of said signal electrodes and said scanning electrodes; at least one counter electrode opposing said pixel electrodes; and supplemental capacitance electrodes for forming capacitors in co-operation with said pixel electrodes, said drive device being characterised by: a signal electrode drive means for AC-driving said signal electrodes; a voltage apply means for applying an AC voltage to said counter electrode, the phase of said AC voltage being different from that of the AC-drive of said signal electrodes, the level of said AC voltage varying with respect to a predetermined reference voltage; and a supplemental capacitance electrode drive means for driving said supplemental electrodes, the drive of said supplemental electrodes being in phase with said AC voltage.
Claim 12
Dependent Claim
24 words
A drive device according to claim 8, wherein the phases of said AC voltage and said AC-drive of said signal electrodes are substantially reversed.
Claim 13
Dependent Claim
84 words
A drive device according to claim 8, wherein said drive device further comprises a voltage signal supply means for outputting a plurality of voltage signals with different levels, said plurality of voltage signals having alternatively positive and negative levels with respect to said reference voltage, and said signal electrode drive means comprises a supply means for selecting one of said plurality of voltage signals in accordance with an input digital video signal, and supplying said selected voltage signal to one of said signal electrodes.
Claim 14
Dependent Claim
40 words
A drive device according to claim 8, wherein said supplemental capacitance electrodes correspond respectively to predetermined ones of said scanning electrodes, and each of said supplemental capacitance electrodes is electrically connected to scanning electrodes other than said predetermined scanning electrodes.
Claim 15
Dependent Claim
19 words
A drive device according to claim 8, wherein said supplemental capacitance electrodes are electrically connected to said counter electrode.
Claim 16
Dependent Claim
33 words
A drive device according to claim 8, wherein said drive device further comprises a scanning electrode drive means for driving said scanning electrodes, said scanning electrode drive means operating at a floating state.
Claim 17
Dependent Claim
20 words
A drive device according to claim 8, wherein said signal electrode drive means is powered by a single power source.
Claim 18
Independent Claim
183 words
A method of driving a display apparatus having a display unit, said display unit including a plurality of signal electrodes arranged in juxtaposition, said display apparatus comprising a signal electrode drive means for converting input digital video signals into voltage signals each having one of plural levels, and supplying said voltage signal to one of said signal electrodes, said method being characterised by: supplying in each frame, when obtaining a standard gray-scale corresponding to one of said voltage signals, a digital video signal which is to be converted to a voltage signal corresponding to said standard gray-scale, to said signal electrode drive means as the input digital video signal corresponding to one signal electrode; and supplying in plural frames, when obtaining an intermediate gray-scale corresponding to none of said voltage signals, a plurality of digital video signals with different levels which are to be converted to different ones of said voltage signals, to said signal electrode drive means as the input digital video signal corresponding to one signal electrode, the ratios of said plurality of digital video signals depending to said intermediate gray-scale.
Claim 19
Independent Claim
183 words
A method of driving a display apparatus having a display unit, said display unit including a plurality of signal electrodes arranged in juxtaposition, said display apparatus comprising a signal electrode drive means for converting input digital video signals into voltage signals each having one of plural levels, and supplying said voltage signal to one of said signal electrodes, said method being characterised by: supplying in each frame, when obtaining a standard gray-scale corresponding to one of said voltage signals, a digital video signal which is to be converted to a voltage signal corresponding to said standard gray-scale, to said signal electrode drive means as the input digital video signal corresponding to one signal electrode; and supplying in plural frames, when obtaining an intermediate gray-scale corresponding to none of said voltage signals, a plurality of digital video signals with different levels which are to be converted to different ones of said voltage signals, to said signal electrode drive means as the input digital video signal corresponding to one signal electrode, the ratios of said plurality of digital video signals depending to said intermediate gray-scale.
Claim 20
Dependent Claim
67 words
A method according to claim 15, wherein said voltage signals are two voltage signals, the levels of which are adjacent to each other, the level of the first one of said two voltage signals being lower than the voltage level corresponding to said intermediate gray-scale, the level of the second one of said two voltage signals being higher than the voltage level corresponding to said intermediate gray-scale.
References Cited (Backward Citations)
No citation records indexed.
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