CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Taiwan Application Serial Number 109129888, filed Sep. 1, 2020, which is herein incorporated by reference in its entirety.

BACKGROUND

Technical Field

The present disclosure relates to a voltage regulating circuit, especially a circuit that can adjust the voltage value of the output voltage.

Description of Related Art

When the electronic device operates in different states, the internal power supply circuit needs to generate different voltages. The traditional method uses multiple sets of DC-DC modules to achieve the purpose of generating multiple sets of different voltages. However, this method requires too many components and the configuration area of the components will increase, which will affect the cost and operational stability of the electronic device.

SUMMARY

One aspect of the present disclosure is a voltage regulating circuit, comprising an impedance circuit, a control unit and a power supply circuit. The impedance circuit comprises a first node and a second node, wherein the second node is electrically coupled to a load through an impedance element. The control unit is electrically coupled to the first node, and configured to control a first voltage value of the first node according to a control signal. An input terminal of the power supply circuit electrically coupled to the second node. An output terminal of the power supply circuit electrically coupled to the load, wherein the power supply circuit is configured to output a control voltage to the load according to a second voltage value of the second node.

Another aspect of the present disclosure is a display device, comprising a display circuit and a voltage regulating circuit. The display circuit comprises a driver and at least a pixel unit. The voltage regulating circuit comprises an impedance circuit, a control unit and a power supply circuit. The impedance circuit comprises a first node and a second node, wherein the second node is electrically coupled to the display circuit through an impedance element. The control unit is electrically coupled to the first node, and configured to control a first voltage value of the first node according to a control signal. An input terminal of the power supply circuit electrically coupled to the second node. An output terminal of the power supply circuit electrically coupled to the display circuit, wherein the power supply circuit is configured to output a control voltage to the display circuit according to a second voltage value of the second node.

Another aspect of the present disclosure is a voltage regulating method, comprising the following steps: adjusting a first voltage value of a first node in an impedance circuit according to a control signal, wherein the impedance circuit comprises a plurality of resistors, the first node and a second node, and the second node is electrically coupled to a power supply circuit and a display circuit; outputting a control voltage to the display circuit through the power supply circuit according to a second voltage value of the second node; and driving at least a pixel unit through the display circuit according to the control voltage to adjust a grayscale value of the at least pixel unit.

It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the disclosure as claimed.

