Method for operating electrophoretic display apparatus, electrophoretic display apparatus, and electronic system
View Patent ↗A method for operating an electrophoretic display apparatus including a first substrate; a second substrate; an electrophoretic device being held between the first substrate and the second substrate and containing electrophoretic particles; a first electrode formed on a surface of the first substrate, the surface facing the electrophoretic device; and a second electrode formed on a surface of the second substrate, the surface facing the electrophoretic device is provided. The method includes image displaying in which a voltage is applied to the electrophoretic device. The image displaying includes device driving in which the electrophoretic device is driven by inputting a first potential into the first electrode and inputting a second potential into the second electrode, and accumulated-charge removing in which a potential of the first electrode is changed, from the first potential to the second potential, stepwise or uniformly at a potential change velocity lower than a potential change velocity upon starting of the device driving.
1. A method for operating an electrophoretic display apparatus, the electrophoretic display apparatus including:
a first substrate;
a second substrate;
an electrophoretic device being held between the first substrate and the second substrate and containing electrophoretic particles;
a first electrode formed on a surface of the first substrate, the surface facing the electrophoretic device; and
a second electrode formed on a surface of the second substrate, the surface facing the electrophoretic device, the method comprising:
image displaying in which a voltage is applied to the electrophoretic device, the image displaying including
device driving in which the electrophoretic device is driven by inputting a first potential into the first electrode and inputting a second potential into the second electrode, and
accumulated-charge removing in which a potential of the first electrode is changed, from the first potential to the second potential, stepwise or uniformly at a potential change velocity lower than a potential change velocity upon starting of the device driving,
wherein, in the accumulated-charge removing, the potential change velocity for the first electrode is in a region represented by Expression (1) below:
v e ≦|V 1 −V 2|/τ (1)
where v e represents the potential change velocity for the first electrode, V1 represents the first potential, V2 represents the second potential, and τ represents a time constant of the electrophoretic device.
2. The method according to claim 1 , wherein, in the accumulated-charge removing, the potential change velocity for the first electrode is set to a maximum value of a range in which self-erasing of the electrophoretic device does not occur.
3. The method according to claim 1 , wherein, in the accumulated-charge removing, driving signals having a waveform for changing the potential of the first electrode at a constant velocity are input into the first electrode.
4. The method according to claim 1 ,
wherein the electrophoretic display apparatus further includes a transistor on the first substrate, the transistor including a drain terminal connected to the first electrode, and
wherein, in the accumulated-charge removing, selection signals having a waveform for changing the potential of the first electrode at a constant velocity are input into a gate terminal of the transistor.
5. The method according to claim 1 , wherein, the image displaying further includes temperature correcting in which the potential change velocity for the first electrode in the accumulated-charge removing is corrected in accordance with environmental temperature, the temperature correcting being performed prior to the accumulated-charge removing.
6. An electrophoretic display apparatus comprising:
a first substrate;
a second substrate;
an electrophoretic device being held between the first substrate and the second substrate and containing electrophoretic particles;
a first electrode formed on a surface of the first substrate, the surface facing the electrophoretic device;
a second electrode formed on a surface of the second substrate, the surface facing the electrophoretic device; and
a voltage control section that applies a driving voltage to the electrophoretic device,
wherein the voltage control section is configured to drive the electrophoretic device to display an image by conducting
a device driving operation in which the electrophoretic device is driven by inputting a first potential into the first electrode and inputting a second potential into the second electrode, and
an accumulated-charge removing operation in which a potential of the first electrode is changed, from the first potential to the second potential, stepwise or uniformly at a potential change velocity lower than a potential change velocity upon starting of the device driving operation,
wherein, in the accumulated-charge removing operation, the potential change velocity for the first electrode is in a region represented by Expression (1) below:
v e ≦|V 1 −V 2|/τ (1)
where v e represents the potential change velocity for the first electrode V1 represents the first potential, V2 represents the second potential, and τ represents a time constant of the electrophoretic device.
7. An electronic system comprising the electrophoretic display apparatus according to claim 6 .