Electroluminescent display
In an electroluminescent display, a pixel driving circuit is coupled between a ground potential terminal and a power voltage terminal of a power source to drive the operation of a light-emitting device. Upon receiving addressing and image data signals from a scan line and a data line, the pixel driving circuit operates to deliver an electric current to the light-emitting device according to the image data signal.
1. An electroluminescent display, comprising:
at least a scan line and a data line;
a light-emitting device; and
a pixel driving circuit coupled with the scan line, the data line and the light-emitting device, wherein the pixel driving circuit when turned on in response to a scan signal issued on the scan line is configured to deliver to the light-emitting device an electric current according to a data signal delivered through the data line;
wherein the pixel driving circuit is coupled between a ground potential terminal and a negative voltage terminal, and the pixel driving circuit further comprises a PMOS transistor having a gate coupled to the scan signal and the data signal, wherein the PMOS transistor receives a gate-source voltage substantially equal to 0V at an ON state and a positive gate-source voltage at an OFF state.
2. The electroluminescent display according to claim 1 , wherein the pixel driving circuit and the light-emitting device are serially coupled between the ground potential terminal and the negative voltage terminal.
3. The electroluminescent display according to claim 1 , wherein the pixel driving circuit comprises:
a current driving circuit that includes the PMOS transistor having a source coupled to the ground potential terminal and a drain coupled to the negative voltage terminal through the light-emitting device;
a storage capacitor coupled with the current driving circuit; and
a switch circuit coupled with the scan line, the data line and the storage capacitor;
wherein the current driving circuit is configured to deliver to the light-emitting device an electric current according to a charge voltage of the storage capacitor selectively charged by the switch circuit in response to the scan and data signals received on the scan and data lines, respectively.
4. The electroluminescent display according to claim 3 , wherein the PMOS transistor is in a saturation range when it is at the ON state.
5. The electroluminescent display according to claim 3 , wherein the switch circuit includes a thin film transistor operating as a switch.
6. The electroluminescent display according to claim 1 , wherein the light-emitting device includes an organic light-emitting diode.
7. The electroluminescent display according to claim 6 , wherein the negative voltage terminal is connected to a cathode of the organic light-emitting diode.
8. An electroluminescent display, comprising:
a power voltage source having a negative voltage terminal and a ground potential terminal; and
a pixel driving circuit coupled between the negative voltage terminal and the ground potential to drive the operation of a light-emitting device in response to addressing and image data signals inputted to the pixel driving circuit,
wherein the pixel driving circuit further comprises a PMOS transistor having a gate coupled to the addressing signal and the image data signal, wherein the PMOS transistor receives a gate-source voltage substantially eciual to 0V at an ON state and a positive gate-source voltage at an OFF state.
9. The electroluminescent display according to claim 8 , wherein the pixel driving circuit and the light-emitting device are serially coupled between the ground potential terminal and the negative voltage terminal.
10. The electroluminescent display according to claim 8 , wherein the light-emitting device includes an organic light-emitting diode.
11. The electroluminescent display according to claim 10 , wherein a cathode of the organic light-emitting diode is connected to the negative voltage terminal.
12. The electroluminescent display according to claim 8 , wherein the pixel driving circuit comprises:
a current driving circuit that includes the PMOS transistor having a source coupled to the ground potential terminal and a drain coupled to the negative voltage terminal through the light emitting device;
a storage capacitor coupled with the current driving circuit; and
a switch circuit coupled with the storage capacitor;
wherein the current driving circuit is configured to deliver to the light-emitting device an electric current according to a charge voltage of the storage capacitor charged through the switch circuit in response to the addressing and image data signals.
13. The electroluminescent display according to claim 12 , wherein the PMOS transistor is in a saturation range when it is at the ON state.
14. The electroluminescent display according to claim 12 , wherein the switch circuit includes a thin film transistor operating as a switch.
15. The electroluminescent display according to claim 3 , wherein the PMOS transistor has a saturation voltage substantially equal to 0V.
16. The electroluminescent display according to claim 12 , wherein the PMOS transistor has a saturation voltage substantially equal to 0V.