Display device capable of monitoring voltage of pixel array
A display device includes a pixel array, a power line, a ground line, at least one power detection line, at least one ground detection line, and a power supply circuit. The power supply circuit configured to provide to the pixel array a supply voltage via the power line and a ground voltage via the ground line, receive from the pixel array at least one detected supply voltage via the at least one power detection line and at least one detected ground voltage via the at least one ground detection line, and adjust the supply voltage and/or the ground voltage according to the at least one detected supply voltage and the at least one detected ground voltage.
1. A display device comprising:
a pixel array;
a power line;
a ground line;
a plurality of power detection lines;
a plurality of ground detection lines; and
a power supply circuit, configured to provide to the pixel array a supply voltage via the power line and a ground voltage via the ground line, receive from the pixel array a plurality of detected supply voltages via the plurality of power detection lines and a plurality of detected ground voltages via the plurality of ground detection lines, and adjust the supply voltage and/or the ground voltage according to the plurality of detected supply voltages and the plurality of detected ground voltages;
wherein the plurality of detected supply voltages are obtained from a plurality of different locations in the pixel array, and the plurality of detected ground voltages are obtained from the plurality of different locations in the pixel array.
2. The display device of claim 1 , wherein the power supply circuit comprises:
a voltage-averaging circuit, coupled to the pixel array, and configured to generate a supply voltage average according to the plurality of detected supply voltages, and generate a ground voltage average according to the plurality of detected ground voltages;
a voltage difference circuit, coupled to the voltage-averaging circuit, and configured to generate a difference according to the supply voltage average and the ground voltage average; and
a control circuit, coupled to the voltage difference circuit, and configured to update the supply voltage and/or the ground voltage according to the difference.
3. The display device of claim 2 , wherein the power supply circuit comprises:
an overvoltage protection circuit, coupled to the control circuit and the power line, and configured to output an overvoltage signal to the control circuit to update the supply voltage with the predetermined high voltage when the supply voltage exceeds a predetermined high voltage.
4. The display device of claim 2 , wherein the power supply circuit comprises:
an overvoltage protection circuit, coupled to the control circuit and the ground line, and configured to output an overvoltage signal to the control circuit to update the ground voltage with the predetermined low voltage when the ground voltage is lower than a predetermined low voltage.
5. The display device of claim 2 , wherein when the difference is less than a predetermined value, the control circuit is configured to increase the supply voltage and/or decrease the ground voltage.
6. The display device of claim 2 , wherein when the difference exceeds a predetermined value, the control circuit is configured to decrease the supply voltage and/or increase the ground voltage.
7. A display device comprising:
a pixel array;
a power line;
a ground line;
a single power detection line;
a single ground detection line; and
a power supply circuit, configured to provide to the pixel array a supply voltage via the power line and a ground voltage via the ground line, receive from the pixel array a single detected supply voltage via the single power detection line and a single detected ground voltage via the single ground detection line, and adjust the supply voltage and/or the ground voltage according to the single detected supply voltage and the single detected ground voltage,
the power supply circuit comprising:
a voltage difference circuit, coupled to the pixel array, and configured to generate a difference according to the single supply voltage and the single ground voltage; and
a control circuit, coupled to the voltage difference circuit, and configured to update the supply voltage and/or the ground voltage according to the difference.
8. The display device of claim 7 , wherein the power supply circuit comprises:
an overvoltage protection circuit, coupled to the control circuit and the power line, and configured to output an overvoltage signal to the control circuit to update the supply voltage with the predetermined high voltage when the supply voltage exceeds a predetermined high voltage.
9. The display device of claim 7 , wherein the power supply circuit comprises:
an overvoltage protection circuit, coupled to the control circuit and the ground line, and configured to output an overvoltage signal to the control circuit to update the ground voltage with the predetermined low voltage when the ground voltage is lower than a predetermined low voltage.