Method for driving electrophoresis display device, electrophoresis display device, and electronic apparatus
View Patent ↗There is provided a method for driving an electrophoresis display device equipped with a plurality of pixel electrodes, each of the pixel electrode being provided for every pixel, a common electrode provided to oppose the plurality of pixel electrodes, and an electrophoresis element containing electrophoresis particles, the electrophoresis element being sandwiched by the plurality of pixel electrodes and the common electrode. The method includes driving the electrophoresis element and updating a display by a common voltage swing drive method in which a rectangular wave in which a first potential and a second potential are repeated is applied to the common electrode for not less than one cycle during a display update time in which the first potential or the second potential for moving the electrophoresis particles is applied to each of the pixel electrodes. A frequency of the rectangular wave is not less than 20 Hz.
1. A method for driving an electrophoresis display device equipped with a pixel electrode that is provided for a pixel, a common electrode provided to oppose the pixel electrode, and an electrophoresis element containing electrophoresis particles, the electrophoresis element being sandwiched by the pixel electrode and the common electrode, the method for driving an electrophoresis display device comprising:
driving the electrophoresis element and updating a display by a common voltage swing drive method in which a rectangular wave in which a first potential and a second potential are repeated is applied to the common electrode for not less than one cycle during a display update time in which the first potential or the second potential for moving the electrophoresis particles is applied to the pixel electrode,
wherein:
the rectangular wave has a first frequency during a first portion of a display update time period such that the first potential and the second potential are alternately applied to the common electrode a plurality of times according to the first frequency during the first portion of the display update time period, the first frequency of the rectangular wave being not less than 20 Hz;
the rectangular wave has a second frequency during a second portion of the display update time period such that the first potential and the second potential are alternately applied to the common electrode a plurality of times according to the second frequency during the second portion of the display update time period, the second portion of the display update time period being later than the first portion of the display update time period.
2. The method for driving an electrophoresis display device according to claim 1 , wherein
a period during applying the first potential and a period during applying the second potential in the rectangular wave are not less than 1 ms and not more than 25 ms.
3. The method for driving an electrophoresis display device according to claim 1 , wherein
a period during applying the first potential and a period during applying the second potential in the rectangular wave are not less than 5 ms and not more than 20 ms.
4. The method for driving an electrophoresis display device according to claim 1 , wherein the first frequency differs from the second frequency.
5. The method for driving an electrophoresis display device according to claim 1 , wherein the second frequency is less than the first frequency.
6. An electrophoresis display device including at least a pixel electrode that is provided for a pixel, a common electrode provided to oppose the pixel electrode, and an electrophoresis element containing electrophoresis particles, the electrophoresis element being sandwiched by the pixel electrode and the common electrode, wherein
driving of the electrophoresis element for updating a display is performed by a common voltage swing drive method in which a rectangular wave in which a first potential and a second potential are repeated is applied to the common electrode for not less than one cycle during a display update time in which the first potential or the second potential for moving the electrophoresis particles is applied to the pixel electrode, and
including a control unit for controlling a frequency of the rectangular wave,
wherein:
the rectangular wave has a first frequency during a first portion of a display update time period such that the first potential and the second potential are alternately applied to the common electrode a plurality of times according to the first frequency during the first portion of the display update time period, the first frequency of the rectangular wave being controlled so as to be not less than 20 Hz;
the rectangular wave has a second frequency during a second portion of the display update time period such that the first potential and the second potential are alternately applied to the common electrode a plurality of times according to the second frequency during the second portion of the display update time period, the second portion of the display update time period being later than the first portion of the display update time period.
7. The electrophoresis display device according to claim 6 , wherein
the control unit controls a period during applying the first potential and a period during applying the second potential in the rectangular wave so as to be not less than 1 ms and not more than 25 ms.
8. The electrophoresis display device according to claim 6 , wherein
the control unit controls a period during applying the first potential and a period during applying the second potential in the rectangular wave so as to be not less than 5 ms and not more than 20 ms.
9. The electrophoresis display device according to claim 6 , wherein
the pixel is equipped with a pixel circuit, and
the control unit employs an active matrix method for controlling the pixel via the pixel circuit.
10. The electrophoresis display device according to claim 9 , wherein the pixel circuit is equipped with a storage device.
11. An electronic apparatus comprising the electrophoresis display device according to claim 6 .
12. A controller for controlling an electrophoresis display device including at least a plurality of pixel electrodes, each of the pixel electrodes being provided for every pixel, a common electrode provided to oppose the plurality of pixel electrodes, and an electrophoresis element containing electrophoresis particles, the electrophoresis element being sandwiched by the plurality of pixel electrodes and the common electrode, the controller executing a method for driving the electrophoresis display device comprising:
driving the electrophoresis element and updating a display by a common voltage swing drive method in which a rectangular wave in which a first potential and a second potential are repeated is applied to the common electrode for not less than one cycle during a display update time in which the first potential or the second potential for moving the electrophoresis particles is applied to each of the pixel electrodes,
wherein:
the rectangular wave has a first frequency during a first portion of a display update time period such that the first potential and the second potential are alternately applied to the common electrode a plurality of times according to the first frequency during the first portion of the display update time period, the first frequency of the rectangular wave being not less than 20 Hz;
the rectangular wave has a second frequency during a second portion of the display update time period such that the first potential and the second potential are alternately applied to the common electrode a plurality of times according to the second frequency during the second portion of the display update time period, the second portion of the display update time period being later than the first portion of the display update time period.