Electro-optic apparatus, driving method for the same, and electronic appliance
To provide an electro-optic apparatus, a driving method for the same, and an electronic appliance that can reduce power consumption, a liquid crystal display device includes a plurality of scan lines, a plurality of data lines, pixel electrodes disposed at each intersection of the scan lines and the data lines, and counter electrodes disposed facing the pixel electrodes, with the counter electrodes being set at a predetermined potential. A memory circuit stores logic corresponding to a tone of a data signal supplied from a data line to the pixel electrode in accordance with logic of a polarity signal. A power supply selecting circuit switches the power supply supplied to the memory circuit based on switches in the logic of the polarity signal. The read circuit switches a read of logic stored in the storage circuit based on switches in the logic of the polarity signal and supplies the pixel electrode.
1. An electro-optic apparatus, comprising:
a plurality of scan lines;
a plurality of data lines that intersect the scan lines;
pixel electrodes disposed at respective intersections of the scan lines and the data lines;
a counter electrode disposed opposite the pixel electrodes, the counter electrodes being set at a predetermined potential;
electro-optic material disposed between the respective pixel electrodes and the respective counter electrodes,
a memory to store logic corresponding to a tone of a data signal supplied from the data lines to the pixel electrodes in accordance with logic of a polarity signal;
a power supply selecting device, the power supply selecting device switching between a first state in which a first potential and a second potential are supplied to the memory and a second state in which a third potential and a fourth potential are supplied to the memory, based on a switching of the logic of the polarity signal; and
a reading device to switch a read of logic stored in the memory device based on the switching of the logic of the polarity signal, and supplying the pixel electrodes,
the predetermined potential being lower than the first potential and the second potential and being higher than the third potential and the fourth potential.
2. The electro-optic apparatus according to claim 1 , in accordance with the logic of the polarity signal, the power supply selecting device selecting one pair of potentials for the logic of the memory out of a first pair and a second pair and supplying the memory with the selected potentials.
3. The electro-optic apparatus according to claim 1 , further comprising:
a tone power supply selecting device that selects, in accordance with the logic of the polarity signal, one pair of potentials for tones of the data signal supplied to the pixel electrodes, out of a first pair and a second pair.
4. The electro-optic apparatus according to claim 3 , one potential in the respective pairs of potentials for tones in the data signal supplied to the pixel electrodes being set at the counter electrode potential.
5. The electro-optic apparatus according to claim 3 , further comprising:
a control device to select one of a moving picture mode and a still picture mode as an operation mode; and a selection permitting device that prohibits supply of the data signal to the pixel electrodes in accordance with a selection of the scan lines when the still picture mode is selected by the control device,
when the still picture mode is selected by the control device, the tone power supply selecting device does not select the potentials of the respective tones of the data signal in accordance with the logic of the polarity signal.
6. The electro-optic apparatus according to claim 5 , further comprising:
a polarity signal processing device to supply, when the still picture mode is selected by the control device, the power supply selecting device and the reading device with a polarity signal in accordance with a selection of the scan lines, and holding the polarity signal and supplying the power supply selecting device and reading device with the held polarity signal in accordance with an unselection of the scan lines.
7. The electro-optic apparatus according to claim 6 , when the still picture mode is selected by the control device, a scan line driving circuit operates as a polarity inverting circuit, the scan lines are successively selected one line at a time, and the polarity is successively inverted by the polarity signal processing device, and when the still picture mode is selected by the control device, a selection period of the scan lines is set longer than a selection period of the scan lines when the moving picture mode is selected.
8. A driving method for an electro-optic apparatus including a plurality of scan lines, a plurality of data lines that intersect the scan lines, pixel electrodes disposed at respective intersections of the scan lines and the data lines, counter electrodes disposed opposite the pixel electrodes, electro-optic material disposed between the respective pixel electrodes and the respective counter electrodes, and a memory to store logic corresponding to a tone of a data signal supplied from the data lines, the driving method comprising:
setting the counter electrodes at a predetermined potential; and
switching between a first state in which a first potential and a second potential are supplied to the memory and a second state in which a third potential and a fourth potential are supplied to the memory, based on a switching of logic of a polarity signal, and
switching a read of logic stored in the memory based on a switch of the logic of the polarity signal, the predetermined potential being lower than the first potential and the second potential and being higher than the third potential and the fourth potential.
9. An electronic appliance, comprising:
an electro-optic apparatus according to claim 1 .