Gate-on voltage generation circuit, display panel driving device and display device

Patent metadata

Field	Value
Publication number	US-11749174-B2
Application number	US-202217894382-A
Country	US
Kind code	B2
Filing date	Aug 24, 2022
Priority date	Feb 4, 2021
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

Disclosed are a gate-on voltage generation circuit, a display panel driving device and a display device. The gate-on voltage generation circuit includes an on/off voltage output terminal, a power management integrated circuit and a voltage switching circuit. The power management integrated circuit includes a detection terminal connected to the on/off voltage output terminal, is configured for detecting a voltage output by the on/off voltage output terminal, and outputting first switch control signal or second switch control signal according to the voltage output from the on/off voltage output terminal. The voltage switching circuit includes a first input terminal for inputting a first voltage value and a second input terminal for inputting a second voltage value larger than the first voltage value. The voltage switching circuit outputs the first voltage value upon receiving the first switch control signal, and outputs the second voltage value upon receiving the second switch control signal.

First claim

What is claimed is:

1. A gate-on voltage generation circuit, comprising:
an on/off voltage output terminal;
a power management integrated circuit comprising a detection terminal connected to the on/off voltage output terminal, wherein the power management integrated circuit is configured for detecting a voltage output by the on/off voltage output terminal, and outputting a first switch control signal or a second switch control signal according to the detected voltage output from the on/off voltage output terminal; and
a voltage switching circuit comprising:
a controlled terminal connected to the power management integrated circuit;
a first input terminal for inputting a first voltage value; and
a second input terminal for inputting a second voltage value larger than the first voltage value,

wherein the voltage switching circuit is configured to output the first voltage value upon receiving the first switch control signal, and output the second voltage value upon receiving the second switch control signal.

2. The gate-on voltage generation circuit of claim 1 , further comprising:
a voltage generation circuit comprising:
an input terminal connected to an output terminal of the voltage switching circuit;
an output terminal connected to the on/off voltage output terminal,

wherein the voltage generation circuit is configured to perform power conversion on the first voltage value or the second voltage value, and output the first voltage value or the second voltage value to the on/off voltage output terminal.

3. The gate-on voltage generation circuit of claim 2 , wherein a control terminal of the power management integrated circuit is connected to a controlled terminal of the voltage generation circuit, and the power management integrated circuit is configured for controlling the voltage generation circuit to operate, and to perform power conversion on the first voltage value or the second voltage value and output the first voltage value or the second voltage value to the on/off voltage output terminal.

4. The gate-on voltage generation circuit of claim 3 , wherein:
the voltage generation circuit comprises a first capacitor, a second capacitor, a third capacitor, a first unidirectional conducting element, a second unidirectional conducting element and a switch transistor;
an input terminal of the first unidirectional conducting element is an input terminal of the voltage generation circuit, and an output terminal of the first unidirectional conduction element is connected to the power management integrated circuit through the first capacitor;
an input terminal of the second unidirectional conducting element is connected to a common terminal of the first unidirectional conducting element and the first capacitor, and an output terminal of the second unidirectional conducting element is grounded through the second capacitor; and
a controlled terminal of the switch transistor is connected to the power management integrated circuit, an input terminal of the switch transistor is connected to a common terminal of the second unidirectional conducting element and the second capacitor, an output terminal of the switch transistor is an output terminal of the voltage generation circuit, and the output terminal of the switch transistor is grounded through the third capacitor.

5. The gate-on voltage generation circuit of claim 4 , wherein the switch transistor is any one or a combination of a metal-oxide-semiconductor (MOS) transistor, a triode, and an Insulated Gate Bipolar Transistor (IGBT).

6. The gate-on voltage generation circuit of claim 4 , wherein the first unidirectional conducting element and the second unidirectional conducting element are diodes.

7. The gate-on voltage generation circuit of claim 2 , wherein the voltage switching circuit comprises:
a first switch transistor, wherein an input terminal of the first switch transistor is the first input terminal, a controlled terminal of the first switch transistor is connected to an output terminal of the power management integrated circuit, an output terminal of the first switch transistor is connected to an input terminal of the voltage generation circuit for outputting the first voltage value to the voltage generation circuit when the voltage switching circuit receives the first switch control signal;
a second switch transistor, wherein an input terminal of the second switch transistor is the second input terminal, a controlled terminal of the second switch transistor is connected to an output terminal of the power management integrated circuit, an output terminal of the second switch transistor is connected to a common terminal of the first switch transistor and the voltage generation circuit for outputting the second voltage value to the voltage generation circuit when the voltage switching circuit receives the second switch control signal.

8. The gate-on voltage generation circuit of claim 7 , wherein the first switch transistor is any one or a combination of a MOS transistor, a triode, and an IGBT.

9. The gate-on voltage generation circuit of claim 7 , wherein the second switch transistor is any one or a combination of a MOS transistor, a triode, and an IGBT.

10. The gate-on voltage generation circuit of claim 1 , wherein the power management integrated circuit is a power management chip comprising an alternating current (AC)/direct current (DC) power management chip, a DC/DC power management chip or a pulse width modulation (PWM)/pulse frequency modulation (PFM) power management chip.

11. The gate-on voltage generation circuit of claim 10 , wherein when the power management integrated circuit is the DC/DC power management chip, the power management chip outputs different voltage values to other circuit modules through different pins of the power management chip to control working states of other circuit modules.

12. The gate-on voltage generation circuit of claim 10 , wherein the power management chip integrates a micro control unit (MCU), an analog digital converter (ADC) conversion circuit and a filter, and an output terminal of the power management integrated circuit comprises a first enable pin and a second enable pin.

13. The gate-on voltage generation circuit of claim 12 , wherein in response that a voltage level corresponding to a voltage detection signal is lower than a voltage level of a reference voltage, the MCU is configured to output the second switch control signal through the second enable pin.

14. The gate-on voltage generation circuit of claim 12 , wherein in response that a voltage level corresponding to a voltage detection signal is greater than a voltage level of a reference voltage, the MCU is configured to output the first switch control signal through the first enable pin.

15. A display panel driving device, comprising a gate-on voltage generation circuit, the gate-on voltage generation circuit comprising:
an on/off voltage output terminal;
a power management integrated circuit comprising a detection terminal connected to the on/off voltage output terminal, wherein the power management integrated circuit is configured for detecting a voltage output by the on/off voltage output terminal, and outputting a first switch control signal or a second switch control signal according to the detected voltage output from the on/off voltage output terminal; and
a voltage switching circuit comprising:
a controlled terminal connected to the power management integrated circuit;
a first input terminal for inputting a first voltage value; and
a second input terminal for inputting a second voltage value larger than the first voltage value,

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Assignees

• Chongqing Advance Display Tech Research
• Chongqing Hkc Optoelectronics Tech Co Ltd

Inventors

• Wang Mingliang

Classifications

• G09G3/2096 Primary

  Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167) · CPC title

• H02M1/08

  Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters · CPC title

• H03K17/56

  by the use, as active elements, of semiconductor devices (using diodes H03K17/74) · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G2330/028

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