Pixel structure of active organic light emitting diode
AssigneeAu Optronics Corporation
InventorKun-Hong Chen
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Abstract
A pixel structure of active organic light emitting diode is disclosed, which comprises an organic light emitting diode, a data-line, a scan-line, a switch thin film transistor (TFT), a control TFT, and a capacitor. The switch TFT has a first lightly doping drain and the control TFT has a second lightly doping drain. The doped concentration of the second lightly doped drain region is higher than that of the first lightly doped drain region. The leakage current in the switch TFT is reduced and the kink effect in the control TFT is improved by the pixel structure of an active organic light emitting diode. Therefore, a better display performance is provided.
Claims17
A pixel structure of an active organic light emitting diode, comprising:
- an organic light emitting diode;
- a data-line;
- a scan-line;
- a switch thin film transistor having a first gate terminal, a first source terminal, a first drain terminal and a first lightly doped drain region, wherein the first gate terminal is coupled to the scan-line and the first source terminal is coupled to the data-line;
- a control thin film transistor having a second gate terminal, a second source terminal, a second drain terminal and a second lightly doped drain region, wherein the second drain terminal is coupled to the organic light emitting diode and the first lightly doped drain region and the second lightly doped drain region have different doped concentrations;
- and
- a capacitor coupled to the first drain terminal and to the second gate terminal.
A pixel structure of an active organic light emitting diode, comprising:
- an organic light emitting diode;
- a data-line;
- a scan-line;
- a switch thin film transistor having a first gate terminal, a first source terminal, a first drain terminal and a first lightly doped drain region, wherein the first gate terminal is coupled to the scan-line and the first drain terminal is coupled to the data-line;
- a control thin film transistor having a second gate terminal, a second source terminal, a second drain terminal and a second lightly doped drain region, wherein the second gate terminal is coupled to the first drain terminal, the second drain terminal is coupled to the organic light emitting diode and the first lightly doped drain region and the second lightly doped drain region have different lengths;
- and
- a capacitor coupled to the first drain terminal and to the second gate terminal.
A pixel structure of an active organic light emitting diode, comprising:
- an organic light emitting diode;
- a data-line;
- a scan-line;
- a switch thin film transistor having a first gate terminal, a first source terminal, a first drain terminal and a first lightly doped drain region, wherein the first gate terminal is coupled to the scan-line and the first drain terminal is coupled to the dam-line;
- a control thin film transistor having a second gate terminal, a second source terminal and a second drain terminal, wherein the second gate terminal is coupled to the first drain terminal and the second drain terminal is coupled to the organic light emitting diode, and wherein no lightly doped drain region is formed in the control thin film transistor;
- and
- a capacitor coupled to the first drain terminal and to the second gate terminal.
Dependencies are inferred from the claim text.