Method for controlling electro-optic device, device for controlling electro-optic device, electro-optic device, and electronic apparatus
View Patent ↗A method for controlling an electro-optic device switches between a first driving scheme for changing an optical state between a-number of optical states and a second driving scheme for changing an optical state between b-number of optical states (b>a). In the first driving scheme, an integrated value W (A→B) of drive voltage and drive time when changing an optical state A to an optical state B, and an integrated value W (B→A) of drive voltage and drive time when changing the pixel from the optical state B to the optical state A satisfy a relation of W (A→B)=−W (B→A), and the integrated value W (A→B) and W (B→A) for the optical state A and B in the second driving scheme are equal to the integrated value W (A→B) and W (B→A) in the first driving scheme, respectively.
1. A method for controlling an electro-optic device having a display section including a plurality of pixels provided at positions corresponding to intersections between mutually intersecting plural scanning lines and plural data lines, each of the pixels including electro-optic material placed between mutually opposing pixel electrode and counter electrode, and capable of assuming a first limit optical state, a second limit optical state and a plurality of intermediate optical states between the first limit optical state and the second limit optical state, and a drive part that supplies, for displaying an image corresponding to image data at the display section, voltage pulses according to the image data to the pixel electrode of each of the pixels in a plurality of frame periods, the method comprising:
switching between a first driving scheme for changing an optical state between a-number of optical states among an optical state group composed of the first limit optical state, the second limit optical state and the plurality of intermediate optical states and a second driving scheme for changing an optical state between b-number of optical states (b>a) among the optical state group,
in the first driving scheme, an integrated value W (A→B) that is an integrated value of drive voltage and drive time when changing the pixel from an optical state A included in the a-number of optical states to an optical state B, and an integrated value W (B→A) that is an integrated value of drive voltage and drive time when changing the pixel from the optical state B to the optical state A satisfying a relation of W (A→B)=−W (B→A), and
the integrated value W (A→B) and the integrated value W (B→A) for the optical state A and the optical state B in the second driving scheme being equal to the integrated value W (A→B) and the integrated value W (B→A) in the first driving scheme, respectively.
2. The method for controlling an electro-optic device according to claim 1 , wherein the a-number of optical states in the first driving scheme are selected to be equal to corresponding ones of the b-number of optical states in the second driving scheme.
3. The method for controlling an electro-optic device according to claim 2 , comprising switching between the first driving scheme, the second driving scheme and a third driving scheme to change the optical state between c-number of optical states (c>b) among the optical state group, the a-number of optical states in the first driving scheme being selected to be equal to corresponding ones of the c-number of optical states in the third driving scheme.
4. The method for controlling an electro-optic device according to claim 3 , wherein the integrated value W (A→B) and the integrated value W (B→A) for the optical state A and the optical state B in the third driving scheme are equal to the integrated value W (A→B) and the integrated value W (B→A) in the first driving scheme, respectively.
5. The method for controlling an electro-optic device according to claim 1 , wherein an integrated value W (Li→Lj) of drive voltage and drive time for arbitrary optical states Li and Lj are set using a weight table having one weight value for each reference optical state, and the integrated value W (Li→Lj) is decided to be proportional to the value of WHT (Lj)−WHT (Li) where WHT (Li) is the weight value of an optical state Li and WHT (Lj) is the weight value of an optical state Lj in the weight table.
6. The method for controlling an electro-optic device according to claim 5 , wherein the weight table is provided for each of the driving schemes, and the weight values corresponding to the same optical states are mutually equal in the weight tables of the driving schemes, respectively.
7. A control device for controlling an electro-optic device comprising:
a display section including a plurality of pixels provided at positions corresponding to intersections between mutually intersecting plural scanning lines and plural data lines, each of the pixels including electro-optic material placed between mutually opposing pixel electrode and counter electrode, and capable of assuming a first limit optical state, a second limit optical state and a plurality of intermediate optical states between the first limit optical state and the second limit optical state;
a drive part that supplies, for displaying an image corresponding to image data at the display section, voltage pulses according to the image data to the pixel electrode of each of the pixels in a plurality of frame periods; and
a control part for controlling the electro-optic device through switching between a first driving scheme for changing an optical state between a-number of optical states among an optical state group composed of the first limit optical state, the second limit optical state and the plurality of intermediate optical states and a second driving scheme for changing an optical state between b-number of optical states (b>a) among the optical state group,
in the first driving scheme, an integrated value W (A→B) of drive voltage and drive time when changing the pixel from an optical state A included in the a-number of optical states to an optical state B, and an integrated value W (B→A) of drive voltage and drive time when changing the pixel from the optical state B to the optical state A satisfying a relation of W (A→B)=−W (B→A), and
the integrated value W (A→B) and the integrated value W (B→A) for the optical state A and the optical state B in the second driving scheme being equal to the integrated value W (A→B) and the integrated value W (B→A) in the first driving scheme, respectively.
8. The control device according to claim 7 , wherein the a-number of optical states in the first driving scheme are selected to be equal to corresponding ones of the b-number of optical states in the second driving scheme.
9. The control device according to claim 8 , wherein the control part switches between the first driving scheme, the second driving scheme and a third driving scheme for changing the optical state among c-number of optical states (c>b) in the optical state group, and the a-number of optical states in the first driving scheme are selected to be equal to corresponding ones of the c-number of optical states in the third driving scheme.
10. The control device according to claim 9 , wherein the integrated value W (A→B) and the integrated value W (B→A) for the optical state A and the optical state B in the third driving scheme are equal to the integrated value W (A→B) and the integrated value W (B→A) in the first driving scheme, respectively.
11. An electro-optic device comprising the control device for controlling an electro-optic device recited in claim 7 .
12. An electronic apparatus comprising the electro-optic device recited in claim 11 .