Method for driving electrophoretic display apparatus, electrophoretic display apparatus, electronic apparatus, and electronic timepiece
View Patent ↗An electrophoretic display apparatus driving method that allows DC balance to be achieved and reduces variations in size and color tone of a displayed image that may occur in a partial-screen drive method and related apparatus are provided. The drive method includes a first image display step (S 2 ) of displaying a first image in a first color on a display section, a first image adjustment step (S 3 ) of displaying a background of the first image in a second color, a first image deletion step (S 4 ) of displaying the background of the first image in the first color, a second image display step (S 12 ) of displaying a background of a second image in the second color, a second image adjustment step (S 13 ) of displaying the second image in the first color, and a second image deletion step (S 14 ) of displaying the second image in the second color.
1. A method for driving an electrophoretic display apparatus including a display section having the following components: a pair of substrates that sandwich an electrophoretic device containing electrophoretic particles; pixels capable of displaying at least a first color and a second color; a pixel electrode corresponding to each of the pixels and formed between one of the substrates and the electrophoretic device; and a common electrode facing the plurality of pixel electrodes and formed between the other substrate and the electrophoretic device, the method comprising:
a first image display step of displaying a first image in the first color on the display section by using a partial-screen drive method for applying a voltage based on a drive pulse signal that repeats a first potential and a second potential to the common electrode and applying a voltage based on a reversal signal or a normal signal of the drive pulse signal to each of the plurality of pixel electrodes to produce an electric field between the pixel electrode and the common electrode so that the electrophoretic particles are moved to redraw an image displayed on the display section;
a first image adjustment step of displaying a background of the first image in the second color on the display section by using the partial-screen drive method after the first image display step;
a first image deletion step of displaying the background of the first image in the first color on the display section by using the partial-screen drive method after the first image adjustment step;
a second image display step of displaying a background of a second image in the second color on the display section by using the partial-screen drive method after the first image deletion step; and
a second image adjustment step of displaying the second image in the first color on the display section by using the partial-screen drive method after the second image display step,
wherein the second image adjustment step is followed by a second image deletion step of displaying the second image in the second color on the display section by using the partial-screen drive method, and
after the second image deletion step, the following first image display step is executed.
2. The method for driving an electrophoretic display apparatus according to claim 1 ,
wherein the first image deletion step includes
a first-image-deletion first step of displaying the background of the first image in the first color in such a way that a voltage-time product in the first-image-deletion first step is equal to the voltage-time product in the first image display step, the voltage-time product being a product of a voltage applied between the common electrode and each of the pixel electrodes multiplied by a voltage application period, and
a first-image-deletion second step of displaying the background of the first image in the first color in such a way that the sum of the voltage-time product in the first-image-deletion second step and the voltage-time product in the first image adjustment step is zero, and
the second image deletion step includes
a second-image-deletion first step of displaying the second image in the second color in such a way that the voltage-time product in the second-image-deletion first step is equal to the voltage-time product in the second image display step, and
a second-image-deletion second step of displaying the second image in the second color in such a way that the sum of the voltage-time product in the second-image-deletion second step and the voltage-time product in the second image adjustment step is zero.
3. The method for driving an electrophoretic display apparatus according to claim 1 , wherein
the voltage-time product in the first image adjustment step is smaller than the voltage-time product in the first image display step, and
the voltage-time product in the second image adjustment step is smaller than the voltage-time product in the second image display step.
4. The method for driving an electrophoretic display apparatus according to claim 1 , wherein
after the first image deletion step and before the second image display step, a first single-color display step of causing all the pixels of the display section to display the first color is added, and
after the second image deletion step and before the following first image display step, a second single-color display step of causing all the pixels of the display section to display the second color is added.
5. An electrophoretic display apparatus comprising
a control section that executes the method for driving an electrophoretic display apparatus according to claim 1 .
6. An electronic apparatus comprising the electrophoretic display apparatus according to claim 5 .
7. An electronic timepiece comprising the electrophoretic display apparatus according to claim 5 .