US 5,703,615 A · Method for driving matrix type flat panel display device · patentgrep

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Abstract

There is provided a matrix-addressed driving method by which the image quality of a matrix type flat panel display device having bistability can be improved. Immediately after an application of an effective pulse of a selection signal, a counter-assist signal which has a polarity inverse to the polarity of the effective pulse of a selection signal for inverting the dark or bright state is added to the scanning signal. In lieu of this counter-assist signal or in addition to the counter-assist signal, an aid-assist signal having a polarity same as the polarity of the effective pulse of the selection signal may also be added at least one time before or after the application of the effective pulse.

Claims14

Dependent claims

In a method for driving a matrix type flat panel display device wherein a row of scanning electrodes intersects a row of signal electrodes at an intersecting point,

wherein a bistable picture element is arranged at said intersecting point,
wherein a scanning signal is applied to said row of scanning electrodes and an ON or OFF display signal is applied to said row of signal electrodes,
wherein a drive signal is synthesized by a combination of said scanning signal and said ON or OFF display signal at said intersecting point, and
wherein said scanning signal comprises:
(1) a reset signal for resetting all said bistable picture elements along said row of scanning electrodes to one of a dark or bright state;
(2) a selection signal for setting a particular bistable picture element at a particular intersecting point on said row of scanning electrodes to one of the bright or dark states from a reset state which has been reset by said reset signal;
(3) a non-selection signal following the selection signal, said non-selection signal keeping the state of said particular bistable picture element set by said selection signal,
(4) where a first part of said drive signal synthesized by a combination of said non-selection signal and said ON or OFF display signal has alternating positive and negative polarity pulses;
the improvement comprising the step of providing said scanning signal with an additional counter-assist signal which is applied immediately after said selection signal and before said non-selection signal;
said counter-assist signal having a waveform such that a second part of said drive signal synthesized by a combination of said counter-assist signal and said ON or OFF display signal has a polarity inverse to a polarity of an effective pulse,
said effective pulse being a third part of said drive signal synthesized by a combination of said selection signal and said ON or OFF display signal and which contributes to setting the particular bistable picture element to one of the bright or dark states;
and
a first time period of said counter-assist signal overlapping a second time period of a respective next selection signal for a respective next row of scanning electrodes.

10 more elements

In a method for driving a matrix type flat panel display device wherein a row of scanning electrodes intersects a row of signal electrodes at an intersecting point,

wherein a bistable picture element is arranged at said intersecting point,
wherein a scanning signal is applied to said row of scanning electrodes and an ON or OFF display signal is applied to said row of signal electrodes,
wherein a drive signal is synthesized by a combination of said scanning signal and said ON or OFF display signal at said intersecting point, and
wherein said scanning signal comprises:
(1) a reset signal for resetting all said bistable picture elements along said row of scanning electrodes to one of a dark or bright state;
(2) a selection signal for setting a particular bistable picture element at a particular intersecting point on said row of scanning electrodes to one of the bright or dark states from a reset state which has been reset by said reset signal;
(3) a non-selection signal following the selection signal, said non-selection signal keeping the state of said particular bistable picture element set by said selection signal,
(4) where a first part of said drive signal synthesized by a combination of said non-selection signal and said ON or OFF display signal has alternating positive and negative polarity pulses;
the improvement comprising the step of providing said scanning signal with an additional aid-assist signal which is applied at least one time immediately before or immediately after the application of said selection signal;
said aid-assist signal having a waveform such that a second part of said drive signal synthesized by a combination of said aid-assist signal and said ON or OFF display signal has a polarity same as a polarity of an effective pulse,
said effective pulse being a third part of said drive signal synthesized by a combination of said selection signal and said ON or OFF display signal and which contributes to setting the particular bistable picture element to one of the bright or dark states;
and
a first time period of said aid-assist signal overlapping a second time period of a respective adjacent selection signal for a respective adjacent row of scanning electrodes.

10 more elements

In a method for driving a matrix type flat panel display device wherein a row of scanning electrodes intersects a row of signal electrodes at an intersecting point,

wherein a bistable picture element is arranged at said intersecting point,
wherein a scanning signal is applied to said row of scanning electrodes and an ON or OFF display signal is applied to said row of signal electrodes,
wherein a drive signal is synthesized by a combination of said scanning signal and said ON or OFF display signal at said intersecting point, and
wherein said scanning signal comprises:
(1) a reset signal for resetting all said bistable picture elements along said row of scanning electrodes to one of a dark or bright state;
(2) a selection signal for setting a particular bistable picture element at a particular intersecting point on said row of scanning electrodes to one of the bright or dark states from a reset state which has been reset by said reset signal;
(3) a non-selection signal following the selection signal, said non-selection signal keeping the state of said particular bistable picture element set by said selection signal,
(4) where a first part of said drive signal synthesized by a combination of said non-selection signal and said ON or OFF display signal has alternating positive and negative polarity pulses;
the improvement comprising the step of providing said scanning signal with an additional aid-assist signal which is applied immediately after the application of said selection signal;
said aid-assist signal having a waveform such that a second part of said drive signal synthesized by a combination of said aid-assist signal and said ON or OFF display signal has a polarity same as a polarity of an effective pulse,
said effective pulse being a third part of said drive signal synthesized by a combination of said selection signal and said ON or OFF display signal and which contributes to setting the particular bistable picture element to one of the bright or dark states;
and
a first time period of said aid-assist signal overlapping a second time period of a respective next selection signal for a respective next row of scanning electrodes.

10 more elements

In a method for driving a matrix type flat panel display device wherein a row of scanning electrodes intersects a row of signal electrodes at an intersecting point,

wherein a bistable picture element is arranged at said intersecting point,
wherein a scanning signal is applied to said row of scanning electrodes and an ON or OFF display signal is applied to said row of signal electrodes,
wherein a drive signal is synthesized by a combination of said scanning signal and said ON or OFF display signal at said intersecting point, and
wherein said scanning signal comprises:
(1) a reset signal for resetting all said bistable picture elements along said row of scanning electrodes to one of a dark or bright state;
(2) a selection signal for setting a particular bistable picture element at a particular intersecting point on said row of scanning electrodes to one of the bright or dark states from a reset state which has been reset by said reset signal;
(3) a non-selection signal following the selection signal, said non-selection signal keeping the state of said particular bistable picture element set by said selection signal,
(4) where a first part of said drive signal synthesized by a combination of said non-selection signal and said ON or OFF display signal has alternating positive and negative polarity pulses;
the improvement comprising the step of providing said scanning signal with an additional aid-assist signal which is applied immediately before the application of said selection signal;
said aid-assist signal having a waveform such that a second part of said drive signal synthesized by a combination of said aid-assist signal and said ON or OFF display signal has a polarity same as a polarity of an effective pulse,
said effective pulse being a third part of said drive signal synthesized by a combination of said selection signal and said ON or OFF display signal and which contributes to setting the particular bistable picture element to one of the bright or dark states;
and
a first time period of said aid-assist signal overlapping a second time period of a respective preceding selection signal for a respective preceding row of scanning electrodes.

10 more elements

In a method for driving a matrix type flat panel display device wherein a row of scanning electrodes intersects a row of signal electrodes at an intersecting point,

wherein a bistable picture element is arranged at said intersecting point,
wherein a scanning signal is applied to said row of scanning electrodes and an ON or OFF display signal is applied to said row of signal electrodes,
wherein a drive signal is synthesized by a combination of said scanning signal and said ON or OFF display signal at said intersecting point, and
wherein said scanning signal comprises:
(1) a reset signal for resetting all said bistable picture elements along said row of scanning electrodes to one of a dark or bright state;
(2) a selection signal for setting a particular bistable picture element at a particular intersecting point on said row of scanning electrodes to one of the bright or dark states from a reset state which has been reset by said reset signal;
(3) a non-selection signal following the selection signal, said non-selection signal keeping the state of said particular bistable picture element set by said selection signal,
(4) where a first part of said drive signal synthesized by a combination of said non-selection signal and said ON or OFF display signal has alternating positive and negative polarity pulses;
the improvement comprising the step of providing said scanning signal with an additional aid-assist signal which is applied immediately before and immediately after the application of said selection signal;
said aid-assist signal having a waveform such that a second part of said drive signal synthesized by a combination of said aid-assist signal and said ON or OFF display signal has a polarity same as a polarity of an effective pulse,
said effective pulse being a third part of said drive signal synthesized by a combination of said selection signal and said ON or OFF display signal and which contributes to setting the particular bistable picture element to one of the bright or dark states;
and
a first time period of said aid-assist signal applied immediately before the application of the selection signal overlapping with a second time period of a respective preceding selection signal for a respective preceding row of scanning electrodes, and a third time period of said aid-assist signal applied immediately after the application of the selection signal overlapping with a fourth time period of a respective next selection signal for a respective next row of scanning electrodes.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/457,305Filed 1 Jun 1995 · continuation
Priority: JP 4-05756510 Feb 1992
Granted: 30 Dec 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G09G 3/3629
Using a passive matrix: using liquid crystals having memory effects, e.g. ferroelectric liquid crystals
G09G 2310/06
Command of the display device: details of flat display driving waveforms
G09G 2310/061
Details of flat display driving waveforms: for resetting or blanking
G09G
Arrangements or circuits for control of indicating devices using static means to

Family

Serial15,864Parent of this continuation · filed 10 Feb 1993
US 5,703,615 AThis patent

From the US filing history. Foreign family members aren’t listed.

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