# US 12,190,772 B1 · Gate driving circuits and display panels

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- Number: US 12,190,772 B1
- Document ID: US12190772B1
- Status: Granted
- Kind: B1
- Application number: 18/523,120
- Filed: 2023-11-29
- Granted: 2025-01-07
- Earliest claimed: 2023-09-21
- Assignees: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Applicants: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Inventors: Donghun Lim; Yunpeng Lin; Yingchun Zhao
- Web page: https://patentgrep.com/patent/US12190772B1

## CPC

- G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters}
- G09G 3/3677: {suitable for active matrices only}
- G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
- G09G 2310/0286: Details of a shift registers arranged for use in a driving circuit
- G09G 2320/04: Maintaining the quality of display appearance
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A gate driving circuit including cascaded gate driving units is provided. A gate driving unit includes a pull-up control module, a pull-up module electrically connected to the pull-up control module through a first node, a pull-down maintaining module electrically connected to the first node and a voltage line, and a voltage control module. An input terminal of the pull-up module loads a clock signal, and an output terminal is electrically connected to a gate line. The pull-down maintaining module is electrically connected to the pull-up module through the first node and includes an inverter module. The voltage control module is electrically connected to an output terminal of the inverter module to control a first transition edge of a signal at the output terminal of the inverter module to lag behind a second transition edge of the clock signal within a duration of a corresponding clock pulse of the clock signal.

## Claims

### Claim 1

A gate driving circuit, comprising a plurality of cascaded gate driving units, wherein each gate driving unit of at least one gate driving unit of the gate driving units comprises:
a pull-up control module configured to pull up a level of a first node of the each gate driving unit in response to a stage-transmission signal;
a pull-up module,
wherein a control terminal of the pull-up module is electrically connected to the pull-up control module through the first node, an input terminal of the pull-up module is electrically connected to a clock signal line to load a clock signal, an output terminal of the pull-up module is electrically connected to a gate line, and
the pull-up module is configured to respond to the level of the first node to transmit the clock signal to the gate line;
a pull-down maintaining module,
wherein the pull-down maintaining module is electrically connected between the first node and a voltage line and is electrically connected to the control terminal of the pull-up module through the first node,
the pull-down maintaining module comprises an inverter module and a switch element,
a control terminal of the inverter module is electrically connected to the first node, and an output terminal of the inverter module is electrically connected to a control terminal of the switch element, and
the switch element is configured to control connection between the gate line and the voltage line; and
a voltage control module,
wherein the voltage control module is electrically connected to the output terminal of the inverter module,
the voltage control module is configured to control a first transition edge of a signal at the output terminal of the inverter module to lag behind a second transition edge of the clock signal within a duration of a corresponding clock pulse of the clock signal,
the first transition edge is arranged adjacent to the second transition edge on a time axis, and
the second transition edge corresponds to an end of the clock pulse.

### Claim 2 (depends on 1)

The gate driving circuit according to claim 1, wherein the voltage control module comprises:
a first voltage control terminal electrically connected to a first control line to load a first control signal;
a voltage input terminal electrically connected to a first voltage line to load a first voltage; and
a voltage output terminal electrically connected to the output terminal of the inverter module;
wherein the first control signal is used to control transmission of the first voltage to the voltage output terminal before the clock signal reaches the second transition edge.

### Claim 3 (depends on 2)

The gate driving circuit according to claim 2, wherein the first control line is the clock signal line.

### Claim 4 (depends on 2)

The gate driving circuit of claim 2, wherein the first input terminal of the inverter module is electrically connected to the first voltage line.

### Claim 5 (depends on 2)

The gate driving circuit according to claim 2, wherein the voltage control module further comprises a second voltage control terminal electrically connected to a second control line to load a second control signal,
wherein the second control signal is used to control transmission of the first voltage to the voltage output terminal through the first control signal before the clock signal reaches the second transition edge.

### Claim 6 (depends on 5)

The gate driving circuit according to claim 5, wherein the second control signal is used to control the inverter module to control the level of the first node after the clock signal reaches the second transition edge.

### Claim 7 (depends on 5)

The gate driving circuit according to claim 5, wherein the at least one gate driving unit comprises a first gate driving unit and a second gate driving unit subsequently cascaded to the first gate driving unit, and the second control line of the first gate driving unit is electrically connected to the first node of the second gate driving unit.

### Claim 8 (depends on 5)

The gate driving circuit according to claim 5, wherein the voltage control module comprises:
a first voltage control transistor, wherein a gate of the first voltage control transistor is configured as the second voltage control terminal, and a source of the first voltage control transistor is configured as the first voltage control terminal; and
a second voltage control transistor, wherein a gate of the second voltage control transistor is electrically connected to a drain of the first voltage control transistor, a source of the second voltage control transistor is configured as the voltage input terminal, and a drain of the second voltage control transistor is configured as the voltage output terminal.

### Claim 9 (depends on 1)

The gate driving circuit according to claim 1, wherein the switch element comprises:
a first pull-down transistor, wherein a gate of the first pull-down transistor is electrically connected to the output terminal of the inverter module, a source of the first pull-down transistor is electrically connected to the voltage line, and a drain of the first pull-down transistor is electrically connected to the gate line.

### Claim 10

A display panel, comprising a gate driving circuit, wherein the gate driving circuit comprises a plurality of cascaded gate driving units, wherein each gate driving unit of at least one gate driving unit of the gate driving units comprises:
a pull-up control module configured to pull up a level of a first node of the each gate driving unit in response to a stage-transmission signal;
a pull-up module,
wherein a control terminal of the pull-up module is electrically connected to the pull-up control module through the first node, an input terminal of the pull-up module is electrically connected to a clock signal line to load a clock signal, an output terminal of the pull-up module is electrically connected to a gate line, and
the pull-up module is configured to respond to the level of the first node to transmit the clock signal to the gate line;
a pull-down maintaining module,
wherein the pull-down maintaining module is electrically connected between the first node and a voltage line and is electrically connected to the control terminal of the pull-up module through the first node,
the pull-down maintaining module comprises an inverter module and a switch element,
a control terminal of the inverter module is electrically connected to the first node, and an output terminal of the inverter module is electrically connected to a control terminal of the switch element, and
the switch element is configured to control connection between the gate line and the voltage line; and
a voltage control module,
wherein the voltage control module is electrically connected to the output terminal of the inverter module,
the voltage control module is configured to control a first transition edge of a signal at the output terminal of the inverter module to lag behind a second transition edge of the clock signal within a duration of a corresponding clock pulse of the clock signal,
the first transition edge is arranged adjacent to the second transition edge on a time axis, and
the second transition edge corresponds to an end of the clock pulse.

### Claim 11 (depends on 10)

The display panel according to claim 10, wherein the voltage control module comprises:
a first voltage control terminal electrically connected to a first control line to load a first control signal;
a voltage input terminal electrically connected to a first voltage line to load a first voltage; and
a voltage output terminal electrically connected to the output terminal of the inverter module;
wherein the first control signal is used to control transmission of the first voltage to the voltage output terminal before the clock signal reaches the second transition edge.

### Claim 12 (depends on 11)

The display panel according to claim 11, wherein the first control line is the clock signal line.

### Claim 13 (depends on 11)

The display panel of claim 11, wherein the first input terminal of the inverter module is electrically connected to the first voltage line.

### Claim 14 (depends on 11)

The display panel according to claim 11, wherein the voltage control module further comprises a second voltage control terminal electrically connected to a second control line to load a second control signal,
wherein the second control signal is used to control transmission of the first voltage to the voltage output terminal through the first control signal before the clock signal reaches the second transition edge.

### Claim 15 (depends on 14)

The display panel according to claim 14, wherein the second control signal is used to control the inverter module to control the level of the first node after the clock signal reaches the second transition edge.

### Claim 16 (depends on 14)

The display panel according to claim 14, wherein the at least one gate driving unit comprises a first gate driving unit and a second gate driving unit subsequently cascaded to the first gate driving unit, and the second control line of the first gate driving unit is electrically connected to the first node of the second gate driving unit.

### Claim 17 (depends on 14)

The display panel according to claim 14, wherein the voltage control module comprises:
a first voltage control transistor, wherein a gate of the first voltage control transistor is configured as the second voltage control terminal, and a source of the first voltage control transistor is configured as the first voltage control terminal; and
a second voltage control transistor, wherein a gate of the second voltage control transistor is electrically connected to a drain of the first voltage control transistor, a source of the second voltage control transistor is configured as the voltage input terminal, and a drain of the second voltage control transistor is configured as the voltage output terminal.

### Claim 18 (depends on 10)

The display panel according to claim 10, wherein the switch element comprises:
a first pull-down transistor, wherein a gate of the first pull-down transistor is electrically connected to the output terminal of the inverter module, a source of the first pull-down transistor is electrically connected to the voltage line, and a drain of the first pull-down transistor is electrically connected to the gate line.