| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light emitting display device using a drive circuit formed of only unipolar thin film transistors, which suppresses effects of characteristic shifts of thin film transistors due to applied voltages, and is applicable to large, high-resolution light emitting displays. <P>SOLUTION: The device has a pixel including an organic EL device LED and a drive circuit 101 driving it. In a current writing period, the drive circuit sets TFT3, TFT4 and TFT5 ON at the same time and sets a ground line GND and one end of LED to the same voltage through TFT3. A current from a data line DL is supplied to transistors L-TFT and D-TFT forming a current mirror circuit through TFT4 and TFT5, and a voltage between gate and source terminals of L-TFT and D-TFT is retained in a capacitor C. During a LED driving period, TFT3, TFT4 and TFT5 are interrupted at the same time, and a current flowing between the source and drain of D-TFT is supplied to LED according to the retaining voltage in the capacitor C. <P>COPYRIGHT: (C)2008,JPO&INPIT |
