CN-224217224-U - Display panel and display device

CN224217224UCN 224217224 UCN224217224 UCN 224217224UCN-224217224-U

Abstract

The present utility model relates to a display panel and a display device. The display panel comprises a half-voltage circuit, a voltage reducing circuit and a power management integrated circuit, wherein the output end of the half-voltage circuit is connected with the input end of the voltage reducing circuit, the output end of the voltage reducing circuit is connected with the input end of an operational amplifier in the power management integrated circuit, the voltage reducing circuit inputs half-mode power supply voltage from the half-voltage circuit through the input end and outputs half-mode power supply voltage through the output end when the display panel is started, and when the display panel is shut down, first voltage is output through the output end and is smaller than half-mode power supply voltage, and the discharge time of the first voltage is smaller than the discharge time of the analog power supply voltage. The technical scheme provided by the utility model can ensure that the half-analog power supply voltage is always smaller than the analog power supply voltage.

Inventors

LIU BING
LOU JIANJIAN

Assignees

昆山龙腾光电股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250423

Claims (10)

1. The display panel is characterized by comprising a half-voltage circuit, a voltage reducing circuit and a power management integrated circuit; the output end of the half-voltage circuit is connected with the input end of the voltage reduction circuit, and the output end of the voltage reduction circuit is connected with the input end of an operational amplifier in the power management integrated circuit; The half-voltage circuit inputs the analog power supply voltage through an input end and outputs the half-analog power supply voltage through an output end, and the half-analog power supply voltage is half of the analog power supply voltage; The step-down circuit inputs the half-mode power supply voltage through an input end, outputs the half-mode power supply voltage through an output end when the display panel is started, and outputs a first voltage through the output end when the display panel is shut down, wherein the first voltage is smaller than the half-mode power supply voltage and the discharge time of the first voltage is smaller than the discharge time of the simulation power supply voltage.
2. The display panel according to claim 1, wherein a potential of the first voltage is 0.
3. The display panel of claim 2, wherein the buck circuit includes a control module; The control module comprises a first end, a second end and a third end, wherein the first end of the control module is connected with the output end of the half-voltage circuit, and the third end of the control module is connected with the input end of the operational amplifier; and the control module inputs the half-mode power supply voltage through a first end, acquires a reference voltage through a second end, and outputs the half-mode power supply voltage or the first voltage through a third end according to a voltage comparison result of the half-mode power supply voltage and the reference voltage, wherein the reference voltage is related to the on-off state of the display panel.
4. A display panel according to claim 3, wherein the control module is a voltage comparator; The voltage comparator comprises a forward input end, a reverse input end and an output end, wherein the forward input end of the voltage comparator is connected with the output end of the half-voltage circuit, and the output end of the voltage comparator is connected with the operational amplifier; the voltage comparator inputs the half-mode power supply voltage through a forward input end, inputs the reference voltage through a reverse input end, outputs the half-mode power supply voltage through an output end when the half-mode power supply voltage is larger than the reference voltage, and outputs the first voltage through the output end when the half-mode power supply voltage is smaller than the reference voltage.
5. The display panel of claim 4, wherein the reference voltage is a gate low voltage when the display panel is turned on and the reference voltage is a gate high voltage when the display panel is turned off.
6. The display panel according to claim 5, wherein the step-down circuit further comprises a first switch circuit and a second switch circuit; The first end of the first switch circuit and the first end of the second switch circuit are connected with a second voltage, the second end of the first switch circuit and the second end of the second switch circuit are connected with the reference voltage, the third end of the first switch circuit and the third end of the second switch circuit are connected with the reverse input end of the voltage comparator, and the second voltage is larger than the grid low voltage and smaller than the grid high voltage; The first switch circuit inputs an electric signal through the first terminal and the second terminal, and outputs the electric signal input from the second terminal through the third terminal when the voltage of the electric signal input at the first terminal is greater than the voltage of the electric signal input at the second terminal; The second switching circuit inputs an electrical signal through the first terminal and the second terminal, and outputs the electrical signal input from the second terminal through the third terminal when the voltage of the electrical signal input at the first terminal is smaller than the voltage of the electrical signal input at the second terminal.
7. The display panel according to claim 6, wherein a potential of the second voltage is 0.
8. The display panel of claim 7, wherein the first switching circuit is NMOS and the second switching circuit is PMOS.
9. The display panel according to any one of claims 1 to 8, further comprising a source driving chip; and the output end of the operational amplifier is connected with the input end of the source electrode driving chip.
10. A display device comprising the display panel according to any one of claims 1 to 9.

Description

Display panel and display device Technical Field The present utility model relates to the field of semiconductor technologies, and in particular, to a display panel and a display device. Background In order to meet the working requirements of different circuit modules in a display product, energy conservation and circuit performance are simultaneously considered, and the high power supply voltage can be converted into a proper low power supply voltage through half-voltage design, so that power is supplied to the different circuit modules. For example, an analog power supply (AVDD) voltage may be converted to a half-analog power supply (half AVDD, HAVDD) voltage by a half-voltage circuit, HAVDD voltage being half the AVDD voltage for a module requiring a lower operating voltage. To improve the stability and load-carrying capability of HAVDD voltages, HAVDD voltages may be passed through an operational amplifier (operational amplifier, OP) of a power management integrated circuit (power integrated circuit, power IC) to power the circuit module. However, the potential HAVDD is higher than the potential AVDD in the shutdown process of the display product, and the requirement of the chip specification (IC SPEC) is not met. Disclosure of utility model The utility model provides a display panel and a display device, so that a display product can meet the requirement that the potential of an analog power supply (analog VDD, AVDD) is higher than that of a half AVDD, HAVDD. The utility model provides a display panel which comprises a half-voltage circuit, a voltage reducing circuit and a power management integrated circuit, wherein the output end of the half-voltage circuit is connected with the input end of the voltage reducing circuit, the output end of the voltage reducing circuit is connected with the input end of an operational amplifier in the power management integrated circuit, the half-voltage circuit inputs analog power supply voltage through the input end and outputs half-analog power supply voltage which is half of the analog power supply voltage through the output end, the voltage reducing circuit inputs half-analog power supply voltage through the input end and outputs half-analog power supply voltage through the output end when the display panel is started, and the output end outputs first voltage when the display panel is shut down, wherein the first voltage is smaller than the half-analog power supply voltage and the discharge time of the first voltage is smaller than the discharge time of the analog power supply voltage. With reference to the first aspect, in one possible implementation manner, the potential of the first voltage is 0. With reference to the first aspect, in one possible implementation manner, the step-down circuit includes a control module, where the control module includes a first end, a second end and a third end, the first end of the control module is connected to the output end of the half-voltage circuit, the third end of the control module is connected to the input end of the operational amplifier, the control module inputs the half-analog power supply voltage through the first end, obtains a reference voltage through the second end, and outputs the half-analog power supply voltage or the first voltage through the third end according to a voltage comparison result of the half-analog power supply voltage and the reference voltage, where the reference voltage is related to a switching-on/off state of the display panel. With reference to the first aspect, in one possible implementation manner, the control module is a voltage comparator, the voltage comparator includes a forward input end, a reverse input end and an output end, the forward input end of the voltage comparator is connected with the output end of the half-voltage circuit, the output end of the voltage comparator is connected with the operational amplifier, the half-voltage power supply voltage is input through the forward input end, the reference voltage is input through the reverse input end, the half-voltage power supply voltage is output through the output end when the half-voltage power supply voltage is greater than the reference voltage, and the first voltage is output through the output end when the half-voltage power supply voltage is less than the reference voltage. With reference to the first aspect, in one possible implementation manner, the reference voltage is a gate low voltage when the display panel is turned on, and the reference voltage is a gate high voltage when the display panel is turned off. With reference to the first aspect, in one possible implementation manner, the step-down circuit further includes a first switch circuit and a second switch circuit, wherein the first end of the first switch circuit and the first end of the second switch circuit are connected with a second voltage, the second end of the first switch circuit and the second end of the second switch circuit are connected with th