EP0319661A2
Expired / Lapsed
EP
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Source electrode driving circuit for matrix type liquid crystal display apparatus
Assignee: Sharp Corp
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Filing: 1988-09-28
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Granted: —
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Expires: 2008-09-28
Abstract
Abstract A source electrode driving circuit for a matrix type liquid crystal display apparatus is respectively provided in the plurality of a partial source electrode driving circuits to output a sampling signal into the shift register (11) after counting of the clock signals by the number of the stages of the shift register has been repeated by an externally set number, with an input timing signal as a reference, so that a connection signal between the partial source electrode driving circuits which causes an image disturbances is not required, with the result of superior display images.
Inventors
- 👤 Makoto Takeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:22
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3685; G09G3/3688; H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/127
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
A source electrode driving circuit for a matrix type liquid crystal display device comprising a plurality of sampling hold circuits (12) each having a concatenated connection for sampling, holding from the input display signal the voltage corresponding to the variable brigthness of the display to be applied to each of the picture elements through a switching element to be added to the respective picture elements of the matrix type liquid crystal display apparatus, of output buffer circuits (13) each outputting to each of the switching elements the voltage held by the sampling hold circuit, a shift register (11) which sequentially shifts in accordance with the clock signal the sampling signal for sequentially operating the plurality of sampling hold circuits, and a shift register controlling circuit (14) outputting into the shift register (11) the sampling signals after the operation for counting the clock signals by the stage-number of the shift register has been repeated by the externally set number, with the inputted timing signal as reference.
Claim 2
Dependent Claim
165 words
A source electrode driving circuit for a matrix type liquid crystal display device comprising a plurality of sampling hold circuits (12) each having a concatenated connection for sampling, holding from the input display signal the voltage corresponding to the variable brigthness of the display to be applied to each of the picture elements through a switching element to be added to the respective picture elements of the matrix type liquid crystal display apparatus, of output buffer circuits (13) each outputting to each of the switching elements the voltage held by the sampling hold circuit, a shift register (11) which sequentially shifts in accordance with the clock signal the sampling signal for sequentially operating the plurality of sampling hold circuits, and a shift register controlling circuit (14) outputting into the shift register (11) the sampling signals after the operation for counting the clock signals by the stage-number of the shift register has been repeated by the externally set number, with the inputted timing signal as reference.
Claim 3
Dependent Claim
114 words
The circuit as defined in Claim 1, wherein the sampling signal is composed by the shift register control circuit (14) comprising a sampling signal generating circuit (15) and a timing selection circuit (16), the sampling signal generating circuit generating one sampling signal every time the clocks are counted by k number with an externally inputted timing signal as a reference when the number of the stages of the shift register circuit (11) is assumed to be k, and the timing selection circuit (16)selecting the ℓth ( ℓ= 0,1,2,...) signal among a series of sampling signals made by the sampling signal generating circuit through the external setting to input it into the shift register circuit.
Claim 4
Dependent Claim
139 words
The circuit as defined in Claim 2, wherein the clock signal which is the same as the clock signal to be inputted to the shift register (11), and a timing signal which controls the start position of the sampling operation are inputted into the sampling signal generating circuit, and the sampling signal generating circuit (15), immediately after the timing signal (S) has been inputted, generates one sampling signal at first, and thereafter the sampling signal one by one every time the clocks are counted as many as the stage-number k of the shift register circuit (11) so as to output the sampling signal into the timing selection circuit (16), the interval tk between the sampling signals being the same as the time required for the sampling signal to completely shift all the stages of the shift register circuit (11).
Claim 5
Dependent Claim
39 words
The circuit as defined in Claim 2, wherein the timing selection circuit takes out only the ℓth pulse from among a series of inputted sampling signals to output it as one sampling signal into the shift register circuit (11).
References Cited (Backward Citations)
No citation records indexed.
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