Liquid crystal apparatus
First Claim
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1. A liquid crystal apparatus, comprising:
- (A) a liquid crystal device comprising a group of scanning electrodes, a group of data electrodes intersecting the scanning electrodes, and a liquid crystal disposed so as to form a matrix of pixels each at an intersection of the scanning electrodes and the data electrodes, said liquid crystal having at least two stable states so as to be written into one stable state when supplied with a voltage of one polarity exceeding a threshold, and (B) drive means for driving the liquid crystal device by selectively applying scanning signals and data signals to the scanning electrodes and the data electrodes so as to selectively apply a combined voltage to each pixel;
said drive means comprising means for;
simultaneously selecting M scanning electrodes (M being an integer of at least
2), and applying scanning signals to the simultaneously selected scanning electrodes and data signals to the data electrodes so as to apply writing pulses for determining states of pixels to pixels at the intersections of the selected scanning electrodes and the data electrodes and so that each pixel on the selected scanning electrodes is supplied with writing pulse(s) of a writing polarity having a time-integrated voltage value which is larger than that of writing pulse(s) of an anti-writing polarity, if any, wherein each scanning signal includes a selection period composed of 2M phases;
the M scanning electrodes selected simultaneously receive scanning signals having mutually different voltage patterns in the selection period, each composed of a various combination of a phase having a selection pulse for determining a pixel state denoted by a voltage pattern digit “
1” and
a phase having no selection pulse denoted by a voltage pattern digit “
0”
;
each data signal is selected from 2M voltage patterns based on display data for associated M pixels on the selected scanning electrodes so as to provide a various combination of a written pixel state denoted by a display pattern digit “
1” and
a non-written pixel state denoted by a display pattern digit “
0”
, so that each data signal is set to have voltage levels for the respective phases which are determined depending on the decree of coincidence between the voltage pattern digit and the display pattern digit at the respective phases, and wherein the voltage level of each phase of a data signal is set to have a highest voltage V1 of a writing polarity when the voltage pattern digits for the M scanning electrodes fully coincide with the display pattern digits for the M pixels, a highest voltage V2 of an anti-writing polarity when the voltage pattern digits for the M scanning electrodes do not coincide at all with the display pattern digit for the M pixels, and a medium voltage Vn when the voltage Pattern digits partly coincide with the display pattern digits, Vn being determined depending on the degree of the coincidence.
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Abstract
A liquid crystal device having a matrix of pixels formed at intersections of scanning electrodes and data electrodes with e.g., a chiral smectic liquid crystal having at least two stable states, is driven at a high speed by simultaneously selecting M scanning electrodes (M being an integer of at least 2), and applying scanning signals to the simultaneously selected scanning electrodes and data signal to the data electrodes so as to apply writing pulses for determining states of pixels to pixels at the intersections of the selected scanning electrodes and the data electrodes and so that each pixel on the selected scanning electrodes is supplied with writing pulse(s) of a writing polarity having a time-integrated voltage value which is larger than that of writing pulse(s) of an anti-writing polarity, if any.
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Citations
15 Claims
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1. A liquid crystal apparatus, comprising:
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(A) a liquid crystal device comprising a group of scanning electrodes, a group of data electrodes intersecting the scanning electrodes, and a liquid crystal disposed so as to form a matrix of pixels each at an intersection of the scanning electrodes and the data electrodes, said liquid crystal having at least two stable states so as to be written into one stable state when supplied with a voltage of one polarity exceeding a threshold, and (B) drive means for driving the liquid crystal device by selectively applying scanning signals and data signals to the scanning electrodes and the data electrodes so as to selectively apply a combined voltage to each pixel;
said drive means comprising means for;
simultaneously selecting M scanning electrodes (M being an integer of at least
2), andapplying scanning signals to the simultaneously selected scanning electrodes and data signals to the data electrodes so as to apply writing pulses for determining states of pixels to pixels at the intersections of the selected scanning electrodes and the data electrodes and so that each pixel on the selected scanning electrodes is supplied with writing pulse(s) of a writing polarity having a time-integrated voltage value which is larger than that of writing pulse(s) of an anti-writing polarity, if any, wherein each scanning signal includes a selection period composed of 2M phases;
the M scanning electrodes selected simultaneously receive scanning signals having mutually different voltage patterns in the selection period, each composed of a various combination of a phase having a selection pulse for determining a pixel state denoted by a voltage pattern digit “
1” and
a phase having no selection pulse denoted by a voltage pattern digit “
0”
;
each data signal is selected from 2M voltage patterns based on display data for associated M pixels on the selected scanning electrodes so as to provide a various combination of a written pixel state denoted by a display pattern digit “
1” and
a non-written pixel state denoted by a display pattern digit “
0”
, so thateach data signal is set to have voltage levels for the respective phases which are determined depending on the decree of coincidence between the voltage pattern digit and the display pattern digit at the respective phases, and wherein the voltage level of each phase of a data signal is set to have a highest voltage V1 of a writing polarity when the voltage pattern digits for the M scanning electrodes fully coincide with the display pattern digits for the M pixels, a highest voltage V2 of an anti-writing polarity when the voltage pattern digits for the M scanning electrodes do not coincide at all with the display pattern digit for the M pixels, and a medium voltage Vn when the voltage Pattern digits partly coincide with the display pattern digits, Vn being determined depending on the degree of the coincidence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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13. A liquid crystal apparatus according to claim 1, wherein the liquid crystal is a liquid crystal exhibiting chiral smectic phase.
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14. A liquid crystal apparatus, comprising:
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(A) a liquid crystal device comprising a group of scanning electrodes, a group of data electrodes intersecting the scanning electrodes, and a liquid crystal disposed so as to form a matrix of pixels each at an intersection of the scanning electrodes and the data electrodes, said liquid crystal having at least two stable states so as to be written into one stable state when supplied with a voltage of one polarity exceeding a threshold, and (B) drive means for driving the liquid crystal device by selectively applying scanning signals and data signals to the scanning electrodes and the data electrodes so as to selectively apply a combined voltage to each pixel;
said drive means comprising means for;
simultaneously selecting M scanning electrodes (M being an integer of at least
2), andapplying scanning signals to the simultaneously selected scanning electrodes and data signals to the data electrodes so as to apply writing pulses for determining states of pixels to pixels at the intersections of the selected scanning electrodes and the data electrodes and so that each pixel on the selected scanning electrodes is supplied with writing pulse(s) of a writing polarity having a time-integrated voltage value which is larger than that of writing pulse(s) of an anti-writing polarity, if any, wherein the scanning signals and the data signals are determined so as to provide a bias ratio of 2-4 in terms of a ratio between the level of the combined voltage applied to a pixel in its selection period and the level of the data signals applied to a pixel in a non-selection period.
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15. A liquid crystal apparatus, comprising:
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(A) a liquid crystal device comprising a group of scanning electrodes, a group of data electrodes intersecting the scanning electrodes, and a liquid crystal disposed so as to form a matrix of pixels each at an intersection of the scanning electrodes and the data electrodes, said liquid crystal having at least two stable states so as to be written into one stable state when supplied with a voltage of one polarity exceeding a threshold, and (B) drive means for driving the liquid crystal device by selectively applying scanning signals and data signals to the scanning electrodes and the data electrodes so as to selectively apply a combined voltage to each pixel;
said drive means comprising means for;
simultaneously selecting M scanning electrodes (M being an integer of at least
2), andapplying scanning signals to the simultaneously selected scanning electrodes and data signals to the data electrodes so as to apply writing pulses for determining states of pixels to pixels at the intersections of the selected scanning electrodes and the data electrodes and so that each pixel on the selected scanning electrodes is supplied with writing pulse(s) of a writing polarity having a time-integrated voltage value which is larger than that of writing pulse(s) of an anti-writing polarity, if any, wherein said liquid crystal has a threshold characteristic represented by a formula of
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Specification
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Current AssigneeCanon Ayutthaya Limited (Canon Inc.)
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Original AssigneeCanon Ayutthaya Limited (Canon Inc.)
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InventorsTsuboyama, Akira, Iba, Jun, Inaba, Yutaka
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Primary Examiner(s)Shalwala, Bipin
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Assistant Examiner(s)Kovalick, Vincent E.
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Application NumberUS09/119,661Time in Patent Office1,008 DaysField of Search345/94, 345/100, 345/103, 345/204, 345/208, 345/210, 348/792US Class Current345/94CPC Class CodesG09G 2310/0205 Simultaneous scanning of se...G09G 2310/062 Waveforms for resetting a p...G09G 3/3629 using liquid crystals havin...
