US5289175A
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Method of and apparatus for driving ferroelectric liquid crystal display device
Assignee: Canon Inc
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Filing: 1992-09-08
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Granted: 1994-02-22
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Expires: 2012-09-08
Abstract
Abstract A method and an apparatus of driving a ferroelectric liquid crystal display device are provided having N scanning electrodes, and M data electrodes arranged in the form of an N×M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes and the data electrodes of the matrix. The method comprises the step of applying a selected scanning signal to a Kth selected scanning electrode in a time period, wherein K is a positive integer and K≦N. A selected data signal is applied to a data electrode in the time period to form a synthetic voltage at a selected pixel, and an auxiliary signal voltage is applied to a (K-A) scanning electrode in the time period, wherein A is a positive integer and 1<A<N.
Inventors
- 👤 Hideyuki Kawagishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:23
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G3/3629; G09G2320/00; G09G2320/02; G09G2320/0209
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
164 words
A method of driving a ferroelectric liquid crystal display device having N scanning electrodes, and M data electrodes arranged in the form of an N×M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes and the data electrodes of the matrix, said method comprising the steps of: applying a selected unipolar scanning signal to a Kth selected scanning electrode in a time period, wherein K is a positive integer and K≦N; applying a selected data signal to a data electrode in the time period to form a synthetic voltage at a selected pixel; applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal to a (K-A) scanning electrode in the time period, wherein A is a positive integer and 1<A<N; and applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining scanning electrodes in the time period.
Claim 2
Independent Claim
164 words
A method of driving a ferroelectric liquid crystal display device having N scanning electrodes, and M data electrodes arranged in the form of an N×M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes and the data electrodes of the matrix, said method comprising the steps of: applying a selected unipolar scanning signal to a Kth selected scanning electrode in a time period, wherein K is a positive integer and K≦N; applying a selected data signal to a data electrode in the time period to form a synthetic voltage at a selected pixel; applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal to a (K-A) scanning electrode in the time period, wherein A is a positive integer and 1<A<N; and applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining scanning electrodes in the time period.
Claim 3
Dependent Claim
38 words
A method according to claim 1, wherein the selected scanning signal has one polarity with respect to the non-selected scanning signal, and wherein the auxiliary signal voltage has the opposite polarity with respect to the non-selected scanning signal.
Claim 4
Dependent Claim
30 words
A method according to claim 1, wherein an erasing voltage is applied to the selected pixel on the Kth scanning electrode prior to the application of the selected scanning signal.
Claim 5
Dependent Claim
32 words
A method according to claim 1, wherein an erasing voltage is applied to the pixels on the scanning electrodes of the matrix prior to the application of the selected scanning signal voltage.
Claim 6
Dependent Claim
12 words
A method according to claim 1, wherein A is equal to 2.
Claim 7
Dependent Claim
36 words
A method according to claim 1, further comprising the step of: applying an additional auxiliary signal to the data electrode, after the application of the selected data signal to the data signal corresponding to the selected
Claim 8
Independent Claim
165 words
An apparatus for driving and controlling a ferroelectric liquid crystal display device having N scanning electrodes and M data electrodes arranged in the form of an N×M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes of the matrix, said apparatus comprising: first means applying a selected unipolar scanning signal to a Kth selected scanning electrode in a time period, wherein K is a positive integer and K≦N; second means applying a selected data signal to a data electrode in the time period to from a synthetic voltage at a selected pixel; third means for applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal to a (K-A) scanning electrode in the time period, wherein A is a positive integer and 1<A<N; and fourth means for applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining scanning electrodes.
Claim 9
Independent Claim
165 words
An apparatus for driving and controlling a ferroelectric liquid crystal display device having N scanning electrodes and M data electrodes arranged in the form of an N×M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes of the matrix, said apparatus comprising: first means applying a selected unipolar scanning signal to a Kth selected scanning electrode in a time period, wherein K is a positive integer and K≦N; second means applying a selected data signal to a data electrode in the time period to from a synthetic voltage at a selected pixel; third means for applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal to a (K-A) scanning electrode in the time period, wherein A is a positive integer and 1<A<N; and fourth means for applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining scanning electrodes.
Claim 10
Dependent Claim
38 words
An apparatus according to claim 7, wherein the selected scanning signal has one plurality with respect to the non-selected scanning signal, and wherein said auxiliary signal voltage has the opposite polarity with respect to the non-selected scanning signal.
Claim 11
Dependent Claim
31 words
An apparatus according to claim 7, wherein an erasing voltage is applied to the selected pixel on the Kth scanning electrode prior to the application of the selected scanning signal voltage.
Claim 12
Dependent Claim
32 words
An apparatus according to claim 7, wherein an erasing voltage is applied to the pixels on the scanning electrodes of the matrix prior to the application of the selected scanning signal voltages.
Claim 13
Dependent Claim
12 words
An apparatus according to claim 7, wherein A is equal to 2.
Claim 14
Dependent Claim
37 words
An apparatus according to claim 7, further comprising: fifth means for applying an additional auxiliary signal to the data electrodes, after the application of the selected data signal to the data signal corresponding to the selected pixel.
Claim 15
Independent Claim
167 words
A method of driving a ferroelectric liquid crystal display device having N scanning electrodes, and M data electrodes arranged in the form of an N×M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes and the data electrodes of matrix, said method comprising the steps of: applying a selected unipolar scanning signal of a first frequency to a Kth selected scanning electrode line in a time period, wherein K is a positive integer and K<N; applying a selected data signal to a data electrode in the time period to form a synthetic voltage at a selected pixel; applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal of the frequency to a (K-A) scanning electrode in the time period, wherein A is a positive integer and A<N; and applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining scanning electrodes.
Claim 16
Independent Claim
167 words
A method of driving a ferroelectric liquid crystal display device having N scanning electrodes, and M data electrodes arranged in the form of an N×M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes and the data electrodes of matrix, said method comprising the steps of: applying a selected unipolar scanning signal of a first frequency to a Kth selected scanning electrode line in a time period, wherein K is a positive integer and K<N; applying a selected data signal to a data electrode in the time period to form a synthetic voltage at a selected pixel; applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal of the frequency to a (K-A) scanning electrode in the time period, wherein A is a positive integer and A<N; and applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining scanning electrodes.
Claim 17
Dependent Claim
38 words
A method according to claim 13, wherein the selected scanning signal has one polarity with respect to the non-selected scanning signal, and wherein the auxiliary signal voltage has the opposite polarity with respect to the non-selected scanning signal.
Claim 18
Dependent Claim
30 words
A method according to claim 13, wherein an erasing voltage is applied to the selected pixel on the Kth scanning electrode prior to the application of the selected scanning signal.
Claim 19
Dependent Claim
32 words
A method according to claim 13, wherein an erasing voltage is applied to the pixels on the scanning electrodes of the matrix prior to the application of the selected scanning signal voltage.
Claim 20
Dependent Claim
12 words
A method according to claim 13, wherein A is equal to 1.
Claim 21
Dependent Claim
37 words
A method according to claim 13, further comprising the step of: applying an additional auxiliary signal to the data electrodes, after the application of the selected data signal to the data signal corresponding to the selected pixel.
Claim 22
Independent Claim
170 words
An apparatus for driving and controlling a ferroelectric liquid crystal display device having N scanning electrodes and M data electrodes arranged in the form of an N×M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes of the matrix, said apparatus comprising: first means applying a selected unipolar scanning signal of a frequency to a Kth selected scanning electrode in a time period, wherein K is a positive integer and K<N; second means applying a selected data signal to a data electrode in the time period to form a synthetic voltage at a selected pixel; third means for applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal of the frequency to a (K-A) scanning electrode in the time period, wherein A is a positive integer and A<N; and fourth means for applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining electrodes.
Claim 23
Independent Claim
170 words
An apparatus for driving and controlling a ferroelectric liquid crystal display device having N scanning electrodes and M data electrodes arranged in the form of an N×M matrix, N and M being positive integers, and a pixel being formed at each intersection of the scanning electrodes of the matrix, said apparatus comprising: first means applying a selected unipolar scanning signal of a frequency to a Kth selected scanning electrode in a time period, wherein K is a positive integer and K<N; second means applying a selected data signal to a data electrode in the time period to form a synthetic voltage at a selected pixel; third means for applying an auxiliary signal voltage polarized opposite to the selected unipolar scanning signal on the basis of a non-selected scanning signal of the frequency to a (K-A) scanning electrode in the time period, wherein A is a positive integer and A<N; and fourth means for applying a non-selected scanning signal different from the auxiliary signal voltage to each of the remaining electrodes.
Claim 24
Dependent Claim
38 words
An apparatus according to claim 19, wherein the selected scanning signal has one polarity with respect to the non-selected scanning signal, and wherein said auxiliary signal voltage has the opposite polarity with respect to the non-selected scanning signal.
Claim 25
Dependent Claim
31 words
An apparatus according to claim 19, wherein an erasing voltage is applied to the selected pixel on the Kth scanning electrode prior to the application of the selected scanning signal voltage;
Claim 26
Dependent Claim
32 words
An apparatus according to claim 19, wherein an erasing voltage is applied to the pixels on the scanning electrodes of the matrix prior to the application of the selected scanning signal voltage.
Claim 27
Dependent Claim
12 words
An apparatus according to claim 19, wherein A is equal to 1.
Claim 28
Dependent Claim
37 words
An apparatus according to claim 19, further comprising fifth means for applying an additional auxiliary signal to the data electrodes, after the application of the selected data signal to the data signal corresponding to the selected pixel.
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