Transistor circuit, display panel and electronic apparatus

Abstract

A transistor circuit is provided including a driving transistor where conductance between the source and the drain is controlled in response to a supplied voltage, and a compensating transistor where the gate is connected to one of the source and the drain, the compensating transistor being connected so as to supply input signals to the gate of the driving transistor through the source and drain. In a transistor circuit where conductance control in a driving transistor is carried out in response to the voltage of input signals, it is possible to control the conductance by using input signals of a relatively low voltage and a variance in threshold characteristics of driving transistors is compensated. With this transistor circuit, a display panel that can display picture images with reduced uneven brightness is achieved.

What is claimed is: 
     
         1 . A display panel comprising:
 a scanning line which a scanning signal is applied to;   a data line which a data voltage is applied to;   a transistor circuit that is configured to take the data voltage from the data line and to generate a first voltage when the transistor circuit is selected by the scanning signal, conductance of the transistor circuit being set by the first voltage; and   a light emitting element which a driving current is supplied to, the driving current being set by the conductance of the transistor circuit,   wherein difference between the data voltage and the first voltage corresponds a threshold voltage of the driving transistor.   
     
     
         2 . The display panel according to  claim 1 ,
 wherein taking the data voltage from the data line and generating the first voltage are perfumed simultaneously.   
     
     
         3 . A display panel comprising:
 a scanning line;   a scanning line driving circuit supplying a scanning signal to the scanning line;   a data line;   a data line driving circuit supplying a data voltage to the data line;   a light emitting element;   a transistor circuit including:
 a switching transistor having a first gate electrically connected to the scanning line; and 
 a driving transistor having a second gate and controlling a driving current flowing through the light emitting element, 
   wherein, when the switching transistor turns on by the scanning signal, the transistor circuit is configured to take the data voltage from the data line and to apply a first voltage to the second gate, and   wherein difference between the data voltage and the first voltage corresponds a threshold voltage of the driving transistor.   
     
     
         4 . The display panel according to  claim 3 ,
 wherein taking the data voltage from the data line and applying the first voltage to the second gate are perfumed simultaneously.   
     
     
         5 . The display panel according to  claim 3 ,
 wherein the driving transistor is a P-channel type transistor, and   wherein the first voltage is lower than the data voltage by the threshold voltage.   
     
     
         6 . The display panel according to  claim 3 ,
 wherein the driving transistor is an N-channel type transistor, and   wherein the first voltage is higher than the data voltage by the threshold voltage.   
     
     
         7 . The display panel according to  claim 3 , further comprising a positive power source,
 wherein the driving transistor is connected between the positive power source and light emitting element.   
     
     
         8 . The display panel according to  claim 3 , the transistor circuit further comprising a capacitor electrically connected to the second gate. 
     
     
         9 . The display panel according to  claim 3 , the transistor circuit further comprising a reset circuit that supplies a reset voltage to the second gate before the switching transistor turns on by the scanning signal. 
     
     
         10 . An electronic apparatus comprising the display panel according to  claim 1 . 
     
     
         11 . An electronic apparatus comprising the display panel according to  claim 2 . 
     
     
         12 . An electronic apparatus comprising the display panel according to  claim 3 . 
     
     
         13 . An electronic apparatus comprising the display panel according to  claim 4 . 
     
     
         14 . An electronic apparatus comprising the display panel according to  claim 5 . 
     
     
         15 . An electronic apparatus comprising the display panel according to  claim 6 . 
     
     
         16 . An electronic apparatus comprising the display panel according to  claim 7 . 
     
     
         17 . An electronic apparatus comprising the display panel according to  claim 8 . 
     
     
         18 . An electronic apparatus comprising the display panel according to  claim 9 .