Power-supply adjusting circuit and display terminal

Patent metadata

Field	Value
Publication number	US-12482403-B2
Application number	US-202418634330-A
Country	US
Kind code	B2
Filing date	Apr 12, 2024
Priority date	Apr 20, 2023
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

Disclosed are a power-supply adjusting circuit and a display terminal. The power-supply adjusting circuit is applied to a display panel for image display. The power-supply adjusting circuit is connected to a driving power output terminal of a power-supply circuit, the power-supply circuit is configured to output driving power to multiple data driving circuits of the display panel via the driving power output terminal. The power-supply adjusting circuit is configured to receive reverse current and absorb-and-store the reverse current or the power-supply adjusting circuit is configured to receive the reverse current and discharge the reverse current to a ground terminal, when the power-supply adjusting circuit detects that the reverse current is input via the driving power output terminal.

First claim

What is claimed is:

1 . A power-supply adjusting circuit applicable to a display panel for image display, wherein the power-supply adjusting circuit is connected to a driving power output terminal of a power-supply circuit, the power-supply circuit is configured to output driving power to a plurality of data driving circuits of the display panel via the driving power output terminal; and the power-supply adjusting circuit is configured to receive reverse current and absorb-and-store the reverse current or the power-supply adjusting circuit is configured to receive the reverse current and discharge the reverse current to a ground terminal, when the power-supply adjusting circuit detects that the reverse current is input via the driving power output terminal;
wherein the power-supply adjusting circuit comprises a detecting circuit, a first adjusting circuit, an energy storage circuit, and a second adjusting circuit; wherein the detecting circuit is connected to the driving power output terminal, the first adjusting circuit is connected to the detecting circuit and the energy storage circuit, and the second adjusting circuit is connected to the energy storage circuit; wherein the driving power output terminal is electrically connected to the plurality of data driving circuits via a power transmission line, the detecting circuit comprises a first resistor, a first node, and a second node, the first node and the second node are two nodes at different positions in the power transmission line, the first resistor is connected in the power transmission line via the first node and a second node, the first node is disposed at one end of the first resistor away from the power-supply circuit, and the second node is located at one end of the first resistor close to the power-supply circuit; and wherein the detecting circuit further comprises a comparator, the comparator has comparison input ends connected to the first node and the second node respectively, the comparator is configured to detect and compare a voltage at the first node and a voltage at the second node; and the comparator is configured to output the first control signal from a first comparison output terminal to the first adjusting circuit in response to detecting that the voltage at the first node is greater than the voltage at the second node, and the comparator is configured to output the second control signal from a second comparison output terminal to the second adjusting circuit in response to detecting that the voltage at the second node is greater than the voltage at the first node.

2 . The power-supply adjusting circuit according to claim 1 , wherein when the power-supply adjusting circuit detects that current output via the driving power output terminal serves as the driving power, the power-supply adjusting circuit is configured to output a compensation current for compensating the driving power output by the power-supply circuit to the plurality of data driving circuits.

3 . The power-supply adjusting circuit according to claim 1 ,
wherein the detecting circuit is configured to detect the reverse current input via the driving power output terminal; and wherein when the detecting circuit detects the reverse current, the detecting circuit is configured to output a first control signal to the first adjusting circuit, and the first adjusting circuit is configured to receive the reverse current according to the first control signal and transmit the reverse current to the energy storage circuit for storage or discharge.

4 . The power-supply adjusting circuit according to claim 3 ,
wherein when the detecting circuit detects current is output via the driving power output terminal, the detecting circuit is configured to output a second control signal to the second adjusting circuit, and the second adjusting circuit is configured to control, according to the second control signal, the energy storage circuit to output the compensation current to compensate the driving power output by the power-supply circuit.

5 . The power-supply adjusting circuit according to claim 1 , wherein the first adjusting circuit comprises a first switching transistor and a second switching transistor, the first switching transistor has a control terminal connected to the first comparison output terminal of the comparator, and is configured to receive the first control signal from the comparator and to be turned on under control of the first control signal, and the first switching transistor has a first conductive terminal connected to the power transmission line and a second conductive terminal connected to the energy storage circuit; and wherein
the second switching transistor has a control terminal connected to the first comparison output terminal of the comparator, and is configured to receive the first control signal from the comparator and to be turned on under control of the first control signal, the second switching transistor has a first conductive terminal connected to the energy storage circuit and a second conductive terminal connected to the ground terminal, and the energy storage circuit is configured to receive and store electric charges in the signal transmission line when the first switching transistor and the second switching transistor are turned on.

6 . The power-supply adjusting circuit according to claim 5 , wherein the second adjusting circuit comprises a third switching transistor and a fourth switching transistor, the third switching transistor has a control terminal connected to the second comparison output terminal of the comparator, and is configured to receive the second control signal from the comparator and to be turned on under control of the second control signal, the third switching transistor has a first conductive terminal connected to the energy storage circuit and a second conductive terminal connected to the power transmission line; and
the fourth switching transistor has a control terminal connected to the second comparison output terminal of the comparator, and is configured to receive the second control signal from the comparator and to be turned on under control of the second control signal, the fourth switching transistor has a first conductive terminal connected to a power supply voltage terminal and a second conductive terminal connected to the energy storage circuit, and the energy storage circuit is configured to output the compensation current to the power transmission line when the third switching transistor and the fourth switching transistor are tuned on.

7 . The power-supply adjusting circuit according to claim 6 , wherein the energy storage circuit comprises a first capacitor, a second capacitor, a third node, and a fourth node, the first capacitor and the second capacitor are connected in parallel between the third node and the fourth node, the second conductive terminal of the first switching transistor and the first conductive terminal of the third switching transistor are connected to the third node, and the first conductive terminal of the second switching transistor and the second conductive terminal of the fourth switching transistor are connected to the fourth node.

8 . The power-supply adjusting circuit according to claim 7 , wherein the power-supply adjusting circuit further comprises a voltage regulator circuit, the voltage regulator circuit comprises a second resistor and a third resistor, the second resistor is connected between the ground terminal and control terminals of the first switching transistor and the second switching transistor, the second resistor is configured to maintain the first switching transistor and the second switching transistor in an off state when the comparator does not output the first control signal; and
the third resistor is connecte

Assignees

• Hkc Corp Ltd

Inventors

• Wu Han
• Yuan Haijiang

Classifications

• G09G2320/0223

  Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes · CPC title

• G09G3/3291

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title

• G09G3/3696

  Generation of voltages supplied to electrode drivers · CPC title

• G06F1/30

  Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations (for resetting only G06F1/24) · CPC title