Display unit, drive circuit, amorphous silicon thin-film transistor, and method of driving OLED

Abstract

A display unit has an organic light emitting diode (OLED) 21 provided in correspondence with each of pixels and capable of emitting light by itself, a drive transistor 22 for driving the OLED 21 , a twig transistor 23 which is formed so as to have a portion of an electrode of the drive transistor 22 independently formed, and which is used to detect a threshold voltage (Vth) of the drive transistor 22 , a compensating capacitor 28 in which the threshold voltage (Vth) detected by the twig transistor 23 is written, a signal capacitor 27 in which a signal voltage to be supplied to the drive transistor 22 is written, a first transistor 24 provided between a data line and the signal capacitor 27 , a second transistor 25 provided between the signal capacitor 27 and the compensating capacitor 28 , and a third transistor 26 provided between a gate electrode and another electrode of the twig transistor 23.

1 .- 16 . (canceled)  
   
   
       17 . A method of driving an organic light emitting diode (OLED) by an amorphous silicon TFT, comprising the steps of: 
 writing a signal voltage to the amorphous silicon TFT;    reading a threshold voltage (Vth) of the amorphous silicon TFT by using a twig transistor provided on the amorphous silicon TFT; and    supplying a control voltage to the amorphous silicon TFT by correcting a new signal voltage on the basis of the threshold voltage (Vth).    
   
   
       18 . The method according to  claim 17 , wherein said step of supplying the control voltage comprises adding the new signal voltage and the threshold voltage (Vth) together.  
   
   
       19 . The method according to  claim 17 , wherein said step of reading the threshold voltage (Vth) comprises executing reading on the basis of an (N- 1 )th select signal precedent to an Nth select signal for supplying the control voltage.