Liquid crystal device, liquid crystal device driving method, and electronic apparatus
地域：
Tokyo
摘要
A liquid crystal device includes, peripheral electrodes including three electrodes for ion trapping, and a transistor coupled to each of the three electrodes. A common signal (COM signal) that varies between a first potential and a second potential in a first period is applied to a counter electrode. A driving signal that varies between a third potential and a fourth potential is input to the transistor. The driving signal is coupled to or uncoupled from the peripheral electrodes by the transistor in a unit of a duration equal to or less than ? of the first period. AC signals varying between a positive-polarity potential and a negative-polarity potential, with a potential of the common signal being a reference, in a second period longer than the first period, are applied to the three electrodes of the peripheral electrodes, in a state where phases of the AC signals are shifted mutually.
說明書
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The present application is based on, and claims priority from JP Application Serial Number 2018-95150, filed May, 17, 2018, the disclosure of which is hereby incorporated by reference herein in its entirety.
The present disclosure relates to a liquid crystal device, a liquid crystal device driving method, and an electronic apparatus including the liquid crystal device.
A liquid crystal device includes a liquid crystal layer held between a pair of substrates. When DC voltages having the same polarity are continuously applied to the liquid crystal layer, the liquid crystal material will degrade and, for example, the specific resistance will change, then the liquid crystal layer cannot display properly. Accordingly, as a driving method for such a liquid crystal device, AC driving is used, in which the polarity of the voltage applied to the liquid crystal layer is inverted in a constant period, e.g., one horizontal duration or one field duration.
In such AC driving, when a driving method that oscillates the potential of an AC signal applied to the pixel electrodes with fixing the potential of a counter electrode, disposed to interpose a liquid crystal layer between the counter electrode and the pixel electrodes is used, the driving circuit that generates the AC signal may require a high breakdown voltage. Accordingly, JP-A-11-119193, for example, proposes a common inversion driving method in which the amplitude of the potential of an AC signal applied to the pixel electrodes is reduced by inverting the polarity of the potential of the counter electrode in one horizontal duration or in one field duration, as described above for example.
權(quán)利要求
What is claimed is:1. A liquid crystal device including an electro-optical material held between a pair of substrates opposing mutually with a sealant interposed therebetween, the liquid crystal device comprising:a pixel electrode disposed in a display region of the liquid crystal device; a common electrode disposed opposing the pixel electrode; a first electrode disposed between the display region and the sealant; a second electrode disposed between the first electrode and the sealant; and a third electrode disposed between the second electrode and the sealant, wherein a common signal varying between a first potential and a second potential, which is lower than the first potential, in a first period is supplied to the common electrode, a first AC signal varying in a second period, which is different from the first period, is supplied to the first electrode, a second AC signal having a phase different from that of the first AC signal is supplied to the second electrode, and a third AC signal having a phase different from those of the first AC signal and the second AC signal is supplied to the third electrode. 2. The liquid crystal device according to claim 1 , wherein the second period is longer than the first period. 3. An electronic apparatus comprising the liquid crystal device according to claim 1 . 4. A liquid crystal device comprising:a first substrate in which a plurality of pixel electrodes are arranged in a display region; a second substrate in which a common electrode is disposed, the common electrode being supplied with a potential of a common signal varying between a first potential and a second potential, which is lower than the first potential, in a first period; a liquid crystal layer held between the first substrate and the second substrate opposing mutually with a sealant interposed therebetween; at least three electrodes opposing the common electrode via the liquid crystal layer, the at least three electrodes being disposed between the display region of the first substrate and the sealant at different intervals from the display region; and a switching element coupled to each of the at least three electrodes, wherein a driving signal varying between a third potential and a fourth potential lower than the third potential is input to the switching element, in a unit of a duration equal to or less than ? of the first period, and AC signals varying between a positive-polarity potential and a negative-polarity potential, with a potential of the common signal being a reference, in a second period, which is longer than the first period, are applied to the at least three electrodes in a state where the phases of the AC signals are shifted from one another. 5. The liquid crystal device according to claim 4 , whereinthe switching element is in a coupled state in all or part of a first duration in which the common signal is at the first potential and the AC signals are at a negative-polarity potential or a second duration in which the common signal is at the second potential and the AC signals are at a positive-polarity potential, the switching element being in an uncoupled state in a duration other than the first duration, when the common signal is in the first duration and the switching element is in a coupled state, the driving signal is at the fourth potential, and when the common signal is in the second duration and the switching element is in the coupled state, the driving signal is at the third potential. 6. The liquid crystal device according to claim 4 , whereinan average of the second periods of the AC signal is an integral multiple (n times) of 6 of the first period of the common signal, and the AC signals applied to the three electrodes repeat a period of n×(6+1) and a period of n×(6?1). 7. The liquid crystal device according to claim 4 , whereina frequency of the common signal is from 60 Hz to 240 Hz, and a frequency of the AC signal is from 0.1 mHz to 5 mHz. 8. The liquid crystal device according to claim 4 , whereinthe at least three electrodes are disposed surrounding the display region in the first substrate. 9. A liquid crystal device comprising:a first substrate in which a plurality of pixel electrodes are arranged in a display region; a second substrate in which a common electrode is disposed throughout the display region, the common electrode being supplied with a potential of a common signal varying between a first potential and a second potential, which is lower than the first potential, in a first period; a liquid crystal layer held between the first substrate and the second substrate, opposing mutually with a sealant interposed therebetween; at least three electrodes for ion trapping, the at least three electrodes being disposed at intervals from one another and between the display region of the first substrate and the sealant; a switching element coupled to each of the at least three electrodes; and a holding capacitor coupled between each of the at least three electrodes and a wiring line to which a potential of the common signal is supplied, wherein a driving signal varying between a third potential and a fourth potential lower than the third potential is input to the switching element, in a unit of a duration equal to or less than ? of the first period, and AC signals varying between a positive-polarity potential and a negative-polarity potential, with a potential of the common signal being a reference, in a second period, which is longer than the first period, are applied to the at least three electrodes in a state where the phases of the AC signals are shifted from one another. 10. A driving method for a liquid crystal device including an electro-optical material held between a pair of substrates opposing mutually with a sealant interposed therebetween, the liquid crystal device including,a pixel electrode disposed in a display region of the liquid crystal device, a common electrode disposed opposing the pixel electrode, and a first electrode, a second electrode, and a third electrode disposed between the sealant and the display region at different intervals from the display region, the driving method comprising: supplying, to the common electrode, a common signal varying between a first potential and a second potential, which is lower than the first potential, in a first period; supplying, to the first electrode, a first AC signal varying in a second period different from the first period; supplying, to the second electrode, a second AC signal having a phase different from that of the first AC signal; and supplying, to the third electrode, a third AC signal having a phase different from those of the first AC signal and the second AC signal. 11. The driving method for a liquid crystal device according to claim 10 , wherein the second period is longer than the first period. 12. A driving method for a liquid crystal device including, a first substrate in which a plurality of pixel electrodes are arranged in a display region, a second substrate in which a common electrode is disposed, the common electrode being supplied with a potential of a common signal varying between a first potential and a second potential, which is lower than the first potential, in a first period, a liquid crystal layer held between the first substrate and the second substrate opposing mutually with a sealant interposed therebetween, at least three electrodes for ion trapping, the at least three electrodes being disposed at intervals from one another and between the display region of the first substrate and the sealant, and opposing the common electrode via the liquid crystal layer, anda switching element coupled to each of the at least three electrodes, the driving method comprising: inputting, to the switching element, a driving signal varying between a third potential and a fourth potential, which is lower than the third potential, in a unit of a duration equal to or less than ? of the first period; and applying, to the at least three electrodes, AC signals varying between a positive-polarity potential and a negative-polarity potential, with a potential of the common signal being a reference, in a second period, which is longer than the first period, in a state where phases of the AC signals are shifted from one another. 13. The driving method for a liquid crystal device according to claim 12 , whereinthe switching element is in a coupled state in all or part of a first duration in which the common signal is at the first potential and the AC signals are at a negative-polarity potential, or a second period in which the common signal is at the second potential and the AC signals are at a positive-polarity potential, the switching element being in an uncoupled state in a duration other than the first duration; and when the common signal is in the first duration and the switching element is in a coupled state, the driving signal is at the fourth potential, and when the common signal is in the second duration and the switching element is in the coupled state, the driving signal is at the third potential. 14. The driving method for a liquid crystal device according to claim 12 , whereinthe liquid crystal device comprises three electrodes for ion trapping, an average of the second periods of the AC signal is an integral multiple (n times) of 6 of the first period of the common signal; and the AC signals repeating a period of n×(6+1) and a period of n×(6?1) are applied to the three electrodes. 15. A driving method for a liquid crystal device including, a first substrate in which a plurality of pixel electrodes are arranged in a display region, a second substrate in which a common electrode is disposed throughout the display region, the common electrode being supplied with a potential of a common signal varying between a first potential and a second potential, which is lower than the first potential, in a first period, a liquid crystal layer held between the first substrate and the second substrate, opposing mutually with a sealant interposed therebetween, at least three electrodes for ion trapping, the at least three electrodes being disposed at intervals from one another and between the display region of the first substrate and the sealant, a switching element coupled to each of the at least three electrodes, and a holding capacitor coupled between each of the at least three electrodes and a wiring line to which a potential of the common signal is supplied,the driving method comprising: inputting, to the switching element, a driving signal varying between a third potential and a fourth potential, which is lower than the third potential, in a unit of a duration equal to or less than ? of the first period; and applying, to the at least three electrodes, AC signals varying between a positive-polarity potential and a negative-polarity potential, with a potential of the common signal being a reference, in a second period, which is longer than the first period, in a state where phases of the AC signals are shifted from one another.
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