Device and method for improved LED driving
An electronic device comprises a display and a controller. The controller is configured to provide a first frequency refresh rate to the display. The controller is also configured to generate a control signal configured to control emission of a light emitting diode of a display pixel of the display at a second frequency based on whether the first frequency refresh rate of the display is less than a predetermined threshold value.
1. A display pixel comprising:
a light-emitting diode;
a drive transistor coupled in series with the light-emitting diode;
a reference voltage line;
an oxide transistor coupled between the reference voltage line and a gate terminal of the drive transistor;
a switching transistor coupled between a data line and a source terminal of the drive transistor; and
a capacitor having a first terminal directly coupled to the gate terminal of the drive transistor and having a second terminal directly coupled to the switching transistor.
2. The display pixel of claim 1 , wherein the drive transistor comprises a silicon transistor.
3. The display pixel of claim 1 , further comprising:
a first emission transistor coupled to the source terminal of the drive transistor.
4. The display pixel of claim 3 , further comprising:
a second emission transistor coupled between a drain terminal of the drive transistor and the light-emitting diode.
5. The display pixel of claim 4 , wherein the first and second emission transistors comprise silicon transistors.
6. The display pixel of claim 1 , wherein the switching transistor is directly coupled to the source terminal of the drive transistor.
7. The display pixel of claim 1 , further comprising:
an anode reset transistor coupled to an anode terminal of the light-emitting diode.
8. The display pixel of claim 7 , wherein the anode reset transistor is coupled between the anode terminal of the light-emitting diode and the data line.
9. The display pixel of claim 8 , wherein the switching transistor and the anode reset transistor comprise silicon transistors.
10. The display pixel of claim 8 wherein the switching transistor is configured to operate at a refresh rate of less than 30 Hz.
11. The display pixel of claim 1 , further comprising:
an anode reset transistor coupled between an anode terminal of the light-emitting diode and the reference voltage line.
12. A display pixel comprising:
a light-emitting diode;
a p-type drive transistor coupled in series with the light-emitting diode;
an oxide transistor coupled between a first voltage line and a terminal of the p-type drive transistor; and
a first silicon switching transistor coupled between a second voltage line and an anode terminal of the light-emitting diode.
13. The display pixel of claim 12 , further comprising:
a second switching transistor coupled between a gate terminal and an additional terminal of the p-type drive transistor, wherein the first and second switching transistors are configured to receive a same gate line signal.
14. The display pixel of claim 13 , further comprising:
a capacitor coupled between the gate terminal of the p-type drive transistor and the anode terminal of the light-emitting diode;
a first emission transistor coupled to the additional terminal of the p-type drive transistor; and
a second emission transistor coupled between the terminal of the p-type drive transistor and the anode terminal of the light-emitting diode.
15. The display pixel of claim 12 , wherein the first voltage line comprises a reference voltage and the second voltage line comprises a data line.
16. The display pixel of claim 12 , wherein the first silicon switching transistor is activated at a rate greater than or equal to a refresh rate of the display pixel.
17. The display pixel of claim 7 , wherein the anode reset transistor is configured to receive a reset voltage separate from the reference voltage.
18. A display pixel comprising:
a light-emitting diode;
a drive transistor coupled in series with the light-emitting diode;
an oxide transistor coupled between a reference voltage line and a terminal of the drive transistor;
a first switching transistor coupled between a data line and an anode terminal of the light-emitting diode; and
a second switching transistor coupled between the data line and a source terminal of the drive transistor.
19. The display pixel of claim 18 , wherein the first switching transistor is activated at a rate different than a refresh rate of the display pixel.
20. The display pixel of claim 18 , wherein the first switching transistor receives a first control signal and the second switching transistor receives a second control signal different than the first control signal.