Electronic Device and Method of Driving the Same

Abstract

To provide a novel driving method for driving an electronic device by using digital gray scale and time gray scale in combination, which secures high duty ratio, which can display an image normally even when a sustain period is shorter than an address period, and which is hardly affected by dulled signal waveform. In a sub-frame period ( 102 ) where a sustain period is shorter than an address period, a clear period ( 105 ) is squeezed in between completion of a sustain period ( 104 ) and start of an address period of the subsequent sub-frame period. The length of the sustain period ( 104 ) thus can be set without being limited by the length of an address period ( 103 ). This non-display period is provided by changing the electric potential of a storage capacitor line. Therefore, unlike the case where the non-display period is provided by changing the electric potential of a cathode wiring, the present invention is hardly affected by dulled signal waveform.

What is claimed is: 
     
         1 . (canceled) 
     
     
         2 . An electronic device comprising:
 a pixel comprising:
 a first transistor; 
 a second transistor; 
 a capacitor; and 
 an electro luminescence element, 
   wherein a gate of the first transistor is electrically connected to a first line,   wherein one of a source and a drain of the first transistor is electrically connected to a gate of the second transistor,   wherein the other of the source and the drain of the first transistor is electrically connected to a second line,   wherein a first electrode of the capacitor is electrically connected to the gate of the second transistor,   wherein a second electrode of the capacitor is electrically connected to a third line,   wherein one of a source and a drain of the second transistor is electrically connected to the electro luminescence element,   wherein the other of the source and the drain of the second transistor is electrically connected to a fourth line, and   wherein the third line is parallel to the first line.   
     
     
         3 . The electronic device according to  claim 2 ,
 wherein the one of the source and the drain of the second transistor is directly connected to the electro luminescence element.   
     
     
         4 . The electronic device according to  claim 2 ,
 wherein the other of the source and the drain of the second transistor is directly connected to the fourth line.   
     
     
         5 . The electronic device according to  claim 2 ,
 wherein the second line and the first line cross each other.   
     
     
         6 . The electronic device according to  claim 2 ,
 wherein the second line is a source signal line.   
     
     
         7 . The electronic device according to  claim 2 ,
 wherein the third line is a storage capacitor line.   
     
     
         8 . The electronic device according to  claim 2 ,
 wherein the third line is configured such that a potential of the third line is changed.   
     
     
         9 . An electronic device comprising:
 a first pixel comprising:
 a first transistor; 
 a second transistor; 
 a first capacitor; and 
 a first electro luminescence element; and 
   a second pixel comprising:
 a third transistor; 
 a fourth transistor; 
 a second capacitor; and 
 a second electro luminescence element, 
   wherein a gate of the first transistor is electrically connected to a first line,   wherein one of a source and a drain of the first transistor is electrically connected to a gate of the second transistor,   wherein the other of the source and the drain of the first transistor is electrically connected to a second line,   wherein a first electrode of the first capacitor is electrically connected to the gate of the second transistor,   wherein a second electrode of the first capacitor is electrically connected to a third line,   wherein one of a source and a drain of the second transistor is electrically connected to the first electro luminescence element,   wherein the other of the source and the drain of the second transistor is electrically connected to a fourth line,   wherein the third line is parallel to the first line,   wherein a gate of the third transistor is electrically connected to the first line,   wherein one of a source and a drain of the third transistor is electrically connected to a gate of the fourth transistor,   wherein a first electrode of the second capacitor is electrically connected to the gate of the fourth transistor,   wherein a second electrode of the second capacitor is electrically connected to the third line, and   wherein one of a source and a drain of the fourth transistor is electrically connected to the second electro luminescence element.   
     
     
         10 . The electronic device according to  claim 9 ,
 wherein the one of the source and the drain of the second transistor is directly connected to the first electro luminescence element.   
     
     
         11 . The electronic device according to  claim 9 ,
 wherein the other of the source and the drain of the second transistor is directly connected to the fourth line.   
     
     
         12 . The electronic device according to  claim 9 ,
 wherein the second line and the first line cross each other.   
     
     
         13 . The electronic device according to  claim 9 ,
 wherein the second line is a first source signal line.   
     
     
         14 . The electronic device according to  claim 9 ,
 wherein the third line is a storage capacitor line.   
     
     
         15 . The electronic device according to  claim 9 ,
 wherein the third line is configured such that a potential of the third line is changed.   
     
     
         16 . The electronic device according to  claim 9 ,
 wherein the other of the source and the drain of the third transistor is electrically connected to a fifth line.   
     
     
         17 . The electronic device according to  claim 9 ,
 wherein the second line is a second source signal line.