Title: Light emitting device and display device
Application Number: 200410048196 Application Date: 2004.06.21
Publication Number: 1573887 Publication Date: 2005.02.02
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G09G3/32
Applicant(s) Name: Sanyo Electric Co. Address:
Inventor(s) Name:
Attorney & Agent: cheng wei
Abstract:
     To make time sharing digital gray-scale display possible with a simple circuit. Each pixel of the display device has an organic EL element 40, a drive TFT 36, a control TFT 32, and a control capacitor 38. The drive TFT 36 is disposed between the EL element 40 and an EL power source and controls the electric power supply to the element 40. The control TFT 32 is connected between a constant voltage source and the gate of the drive TFT 36, receives a digital data signal in the gate and performs control as to whether the gate voltage of the drive TFT 36 is fixed or not. A control pulse signal specifying the light emission period of the EL element 40 is applied to a control line and the control capacitor 38 is connected between the control line and the gate of the drive TFT 36. The gate voltage V2 of the drive TFT 36 shifts to the voltage corresponding to the control pulse signal when the control TFT 32 is off and V 2 is non-fixed during the light emission period specified by the control pulse signal. Whether the drive TFT 36 is on or not can be controlled by the level of the control pulse signal and the data signal is merely required to control the on and off of the control TFT 32.
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