Method and circuit for driving electrophoretic display and electronic device using same

Abstract

An active matrix electrophoretic display is driven. In a reset period Tr a reset voltage is applied to each pixel electrode. Next, in a writing period an applied voltage is applied to each of said pixel electrode during a time period corresponding to a gradation value designated by an image data. Next, a common voltage is applied to each of said pixel electrode, so that electric charge accumulated in each capacitor is taken away and no electric field is applied to each dispersal system, thereby a displayed image is held.

What is claimed is: 
     
       1. A method for driving a display including pigment particles that are included in a dispersal system, the method comprising:
 applying a constant voltage to the pigment particles through a first electrode and a second electrode, so as to cause the pigment particles to migrate to a position corresponding to a gradation, which includes levels of gradation between zero and one hundred percent, for display by an element; and; and 
 applying, before the pigment particles reach the position, a brake voltage to the pigment particles through the first electrode and the second electrode after the applying of the constant voltage is carried out, so as to stop movement of the pigment particles at the position, the brake voltage having a non-zero value. 
 
     
     
       2. The method according to  claim 1 , wherein a duration of application of the brake voltage is set according to the a duration of the constant voltage. 
     
     
       3. The method according to  claim 1 , the brake voltage functioning as a brake on the pigment particles. 
     
     
       4. The method according to  claim 1 , an influence of the constant voltage on the pigment particles being opposite to an influence of the brake voltage on the pigment particles. 
     
     
       5. The method according to  claim 1 , the brake voltage being applying a force applied to the pigment particles that is induced by opposite an action a force applied by the constant voltage. 
     
     
       6. The method according to  claim 1 , the brake voltage being inducing an action of the pigment particles that is induced by opposite an action induced by the constant voltage. 
     
     
       7. The method according to  claim 1 , the brake voltage being applied to the pigment particles such that the brake voltage suspends an action of the pigment particles induced by the constant voltage. 
     
     
       8. The method according to  claim 1 , the brake voltage functioning as a brake for an action of the pigment particles induced by the constant voltage. 
     
     
       9. A method for driving a display including pigment particles that are included in a dispersal system between a first electrode and the a second electrode, the method comprising:
 applying a first voltage to the pigment particles so as to cause the pigment particles to migrate to a position corresponding to a gradation, which includes levels of gradation between zero and one hundred percent, for display by an element; and 
 applying, before the pigment particles reach the position, a second voltage to the pigment particles, so as to stop movement of the pigment particles at the position. position,  
 a polarity of the first voltage with regard to a potential of the second electrode being opposite to a polarity of the second voltage with regard to the potential of the second electrode. 
 
     
     
       10. The method according to  claim 9 , the applying of the first voltage being according to a gray scale. 
     
     
       11. The method according to  claim 9 , wherein a duration of application of the second voltage is set according to the a duration of the first voltage. 
     
     
       12. The method according to  claim 9 , the second voltage functioning as a brake on the pigment particles. 
     
     
       13. The method according to  claim 9 , an influence of the first voltage on the pigment particles being opposite to an influence of the second voltage on the pigment particles. 
     
     
       14. The method according to  claim 9 , the second voltage being applying a force applied to the pigment particles that is induced by opposite an action a force applied by the first voltage. 
     
     
       15. The method according to  claim 9 , the second voltage being inducing an action of the pigment particles that is induced by opposite an action induced by the first voltage. 
     
     
       16. The method according to  claim 9 , the second voltage being applied to the pigment particles such that the second voltage suspends an action of the pigment particles induced by the first voltage. 
     
     
       17. The method according to  claim 9 , the second voltage functioning as a brake for an action of the pigment particles induced by the first voltage.