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US 6,747,624 B1Granted
Driving circuit for supplying tone voltages to liquid crystal display panel
AssigneeFujitsu Limited
InventorsShinya Udo, Osamu Kudo
Life of this patent
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Abstract
In the LCD panel driving circuit, the voltage of first and second buffer amplifiers is supplied to first output pad, the voltage of second and third buffer amplifiers is supplied to second output pad, and voltage of third and fourth buffer amplifiers is supplied to third output pad. Thus, data-line selection switches and output-polarity selection switches are switched in such a way that the voltage supplied to any adjacent output pads is always supplied from adjacent buffer amplifiers.
Claims7
An LCD panel driving circuit comprising:
- a plurality of buffer amplifiers which are arranged so as to form a line and supply tone voltages to a plurality of output terminals which are also arranged so as to form a line,
- wherein tone voltages supplied to any two adjacent output terminals of said plurality of output terminals are always output from two adjacent buffer amplifiers of said plurality of buffer amplifiers,
- further wherein each pair of adjacent output terminals of said output terminals are configured to be supplied selectively by three of said buffer amplifiers with said tone voltages so that a first two of said three of said buffer amplifiers supply said tone voltages during a first time period and a second two of said three of said buffer amplifiers supply said tone voltages during a second time period subsequent to said first time period.
An LCD panel driving circuit for feeding output from 2j units of selectors, wherein j is a natural number, to 2j data lines;
- said circuit comprising:
- j units of first-polarity selectors which select a tone voltage based on a data for first-polarity output;
- j units of second-polarity selectors which select a tone voltage based on a data for second-polarity output;
- j units of first-polarity buffer amplifiers each one of which is connected to each one said first-polarity selectors;
- a second-polarity buffer amplifier connectable to one particular unit of said second-polarity selector;
- j units of second-polarity buffer amplifiers each one of which is correlated to two units of said second-polarity selectors and are shared by said two units of second-polarity selector;
- j units of data-line selection switches each one of which switches a target for connection of said second-polarity selection between the correlated pair of said second-polarity buffer amplifiers at the same time;
- and
- 2j units of output-polarity selection switches each one of which switches a target for output of said first-polarity buffer amplifier between a pair of adjacent data lines at the same timing as that of said data-line selection switches, switches a target for output of one second-polarity buffer amplifier of said pair of second-polarity buffer amplifiers between one of said pair of data lines and the data line further adjacent thereto, and also switches a target for output of the other second-polarity buffer amplifier between the other one of said pair of data lines and the data line further adjacent thereto.
6 more elements
An LCD panel driving circuit for feeding output from 2j units of selectors, wherein j is a natural number, to 2j data lines;
- said circuit comprising:
- an LCD panel which can display colors using pixels;
- and
- each data line block corresponding to the pixels of said LCD panel displaying the same color has
- j units of first polarity selectors which select a tone voltage based on a data for first-polarity output;
- j units of second-polarity selectors which select a tone voltage based on a data for second-polarity output;
- j units of first-polarity buffer amplifiers each one of which is connected to each one of said first-polarity selectors;
- a second-polarity buffer amplifier connectable to one particular unit of said second-polarity selector;
- j units of second-polarity buffer amplifiers each one of which is correlated to two units of said second-polarity selectors and are shared by said two units of a second-polarity selector;
- j units of data-line selection switches each one of which switches a target for connection of said second-polarity selector between the correlated pair of said second-polarity buffer amplifiers at the same timing;
- and
- 2j units of output-polarity selection switches each one of which switches a target for output of said first-polarity buffer amplifier between a pair of adjacent data lines at the same timing as that of said data-line selection switches, switches a target for output of one second-polarity buffer amplifier of said pair of second-polarity buffer amplifiers between one of said pair of data lines and the data line further adjacent thereto, and also switches a target for output of the other second-polarity buffer amplifier between the other one of said pair of data lines and the data line further adjacent thereto.
9 more elements
Dependencies are inferred from the claim text.