# US 2019/0172392 A1 · Pixel driving circuit, driving method for the same and display panel

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- Number: US 2019/0172392 A1
- Document ID: US20190172392A1
- Status: Published application
- Kind: A1
- Application number: 16/152,263
- Filed: 2018-10-04
- Published: 2019-06-06
- Earliest claimed: 2017-12-04
- Assignees: Boe Technology Group Co., Ltd.; Hefei Xinsheng Optoelectronics Technology Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.; Hefei Xinsheng Optoelectronics Technology Co., Ltd.
- Inventors: Xianrui Qian; Yuting Chen; Zixuan Wang; Bo Li; Fei Li
- Web page: https://patentgrep.com/patent/US20190172392A1

## CPC

- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/3266: Details of drivers for scan electrodes
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
- G09G 2300/0871: with level shifting
- G09G 2310/0248: Precharge or discharge of column electrodes before or after applying exact column voltages
- G09G 2310/0264: Details of driving circuits
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0252: Improving the response speed
- G09G 2320/043: Preventing or counteracting the effects of ageing
- G09G 2330/08: Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
- 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

The present disclosure relates to a pixel driving circuit and a driving method for the same and a display panel. The pixel driving circuit includes a driver unit, a circuit switching unit, and a storage capacitor unit. The driver unit includes a first sub-driver unit and a second sub-driver unit. The circuit switching unit has a first switching unit and a second switching unit. Two terminals of the first switching unit are electrically connected to a first terminal of the light emitting unit and the first sub-driver unit, respectively, two terminals of the second switching unit are electrically connected to the light emitting unit and the second sub-driver unit, respectively, and the circuit switching unit is configured to switch conductive states of the first switching unit and the second switching unit.

## Claims

### Claim 1

A pixel driving circuit comprising a driver unit, a circuit switching unit, and a storage capacitor unit, wherein:
the driver unit comprises a first sub-driver unit and a second sub-driver unit;
the circuit switching unit has a first switching unit and a second switching unit, wherein two terminals of the first switching unit are electrically connected to a first terminal of a light emitting unit and the first sub-driver unit, respectively, two terminals of the second switching unit are electrically connected to the light emitting unit and the second sub-driver unit, respectively, and the circuit switching unit is configured to switch conductive states of the first switching unit and the second switching unit.

### Claim 2 (depends on 1)

The pixel driving circuit according to claim 1, wherein the first sub-driver unit and the second sub-driver unit are thin film transistors.

### Claim 3 (depends on 1)

The pixel driving circuit according to claim 1, wherein the pixel driving circuit further comprises a switching unit:
the storage capacitor unit comprises a first capacitor and a second capacitor;
the switching unit comprises a first data writing unit and a second data writing unit;
wherein the first data writing unit and a gate of the first sub-driver unit are connected via the first capacitor, and the second data writing unit and a gate of the second sub-driver unit are connected via the second capacitor.

### Claim 4 (depends on 3)

The pixel driving circuit according to claim 3, wherein the pixel driving circuit comprises:
a data terminal connected to a first electrode of the first data writing unit and a first electrode of the second data writing unit;
a first control terminal connected to a gate of the first data writing unit;
a second control terminal connected to a gate of the second data writing unit;
a third control terminal connected to a gate of the first switching unit;
a fourth control terminal connected to a gate of the second switching unit;
a first level signal input terminal connected to a second terminal of the light emitting unit;
a second level signal input terminal connected to a first electrode of the first sub-driver unit and a first electrode of the second sub-driver unit;
wherein a second electrode of the first sub-driver unit is connected to a first electrode of the first switching unit, a second electrode of the second sub-driver unit is connected to a first electrode of the second switching unit, a second electrode of the first switching unit is connected to a first terminal of the light emitting unit, and a second electrode of the second switching unit is connected to the first terminal of the light emitting unit.

### Claim 5 (depends on 4)

The pixel driving circuit of claim 4, further comprising a first charging unit and a first discharging unit;
wherein:
the first charging unit has a first charging switch, and two terminals of the first charging switch are connected to a charging circuit and a first terminal of the first capacitor, respectively;
the first discharging unit has a first discharging switch, and two terminals of the first discharging switch are connected to a discharging circuit and a second terminal of the first capacitor.

### Claim 6 (depends on 5)

The pixel driving circuit according to claim 5, wherein:
a gate of the first charging unit is connected to the second control terminal, a first electrode of the first charging unit is connected to the first electrode of the first switching unit, and a second electrode of the first charging unit is connected to the first terminal of the first capacitor;
a gate of the first discharging unit is connected to the second control terminal, a first electrode of the first discharging unit is connected to a second terminal of the first capacitor, and a second electrode of the first discharging unit is connected to a common ground.

### Claim 7 (depends on 4)

The pixel driving circuit according to claim 4, further comprising a second charging unit and a second discharging unit;
wherein:
the second charging unit has a second charging switch, and two terminals of the second charging switch are connected to a charging circuit and a first terminal of the second capacitor, respectively;
the second discharging unit has a second discharging switch, and two terminals of the second discharging switch are connected to a discharging circuit and a second terminal of the second capacitor.

### Claim 8 (depends on 7)

The pixel driving circuit according to claim 7, wherein:
a gate of the second charging unit is connected to the first control terminal, a first electrode of the second charging unit is connected to the first electrode of the second switching unit, and a second electrode of the second charging unit is connected to a first terminal of the second capacitor;
a gate of the second discharging unit is connected to the first control terminal, a first electrode of the second discharging unit is connected to a second terminal of the second capacitor, and a second electrode of the second discharging unit is connected to a common ground.

### Claim 9 (depends on 4)

The pixel driving circuit according to claim 4, wherein the first sub-driver unit and the second sub-driver unit are P-type thin film transistors, a signal input to the first level signal input terminal is a high level signal, and a signal input to the second level signal input terminal is a low level signal.

### Claim 10

An array substrate, comprising a pixel driving circuit;
wherein the pixel driving circuit comprises a light emitting unit, a driver unit, a circuit switching unit, and a storage capacitor unit, wherein:
the driver unit comprises a first sub-driver unit and a second sub-driver unit;
the circuit switching unit has a first switching unit and a second switching unit, wherein two terminals of the first switching unit are electrically connected to a first terminal of the light emitting unit and the first sub-driver unit, respectively, two terminals of the second switching unit are electrically connected to the light emitting unit and the second sub-driver unit, respectively, and the circuit switching unit is configured to switch conductive states of the first switching unit and the second switching unit.

### Claim 11 (depends on 10)

A display panel, comprising the array substrate according to claim 10.

### Claim 12 (depends on 4)

A driving method for the pixel driving circuit according to claim 4, comprising:
in a first writing stage, inputting a high level signal to the first control terminal to make the first data writing unit in a conductive state, and to transmit a data signal at the data terminal to the first capacitor;
in a first driving stage, inputting a high level signal to the third control terminal to make the first switching unit in a conductive state, inputting a low high level signal to the fourth control terminal to make the second switching unit in a non-conductive state, and driving the light emitting unit to emit light by the first sub-driver unit;
in a second writing stage, inputting a high level signal to the second control terminal to make the second data writing unit in a conductive state, and to transmit the data signal at the data terminal to the second capacitor;
in a second driving stage, inputting a high level signal to the fourth control terminal to make the second switching unit in a conductive state, inputting a low level signal to the third control terminal to make the first switching unit in a non-conductive state, and driving the light emitting unit to emit light by the second sub-driver unit.

### Claim 13 (depends on 12)

The method according to claim 12, wherein the pixel driving circuit further comprises a first charging unit and a first discharging unit;
wherein:
the first charging unit has a first charging switch, and two terminals of the first charging switch are connected to a charging circuit and a first terminal of the first capacitor, respectively;
the first discharging unit has a first discharging switch, and two terminals of the first discharging switch are connected to a discharging circuit and a second terminal of the first capacitor;
a gate of the first charging unit is connected to the second control terminal, a first electrode of the first charging unit is connected to the first electrode of the first switching unit, and a second electrode of the first charging unit is connected to the first terminal of the first capacitor;
a gate of the first discharging unit is connected to the second control terminal, a first electrode of the first discharging unit is connected to a second terminal of the first capacitor, and a second electrode of the first discharging unit is connected to a common ground;
in the second writing stage, the method further comprises:
inputting a high level signal to the second control terminal, and at the same time inputting a high level signal to the third control terminal to make the first charging unit in a conductive state and the first discharging unit in a conductive state and to charge the first capacitor;
inputting a low level signal to the third control terminal to make the first switching unit in a non-conductive state to discharge the first capacitor until a voltage across the first and second terminals of the first capacitor is dropped to a threshold voltage of the first sub-driver unit;
in the second driving state, the method further comprises:
inputting a low level signal to the second control terminal to make the first charging unit in a non-conductive state and the first discharging unit in a non-conductive state.

### Claim 14 (depends on 12)

The method according to claim 12, wherein the pixel driver unit further comprises a second charging unit and a second discharging unit;
wherein:
the second charging unit has a second charging switch, and two terminals of the second charging switch are connected to a charging circuit and a first terminal of the second capacitor, respectively;
the second discharging unit has a second discharging switch, and two terminals of the second discharging switch are connected to a discharging circuit and a second terminal of the second capacitor;
a gate of the second charging unit is connected to the first control terminal, a first electrode of the second charging unit is connected to the first electrode of the second switching unit, and a second electrode of the second charging unit is connected to a first terminal of the second capacitor;
a gate of the second discharging unit is connected to the first control terminal, a first electrode of the second discharging unit is connected to a second terminal of the second capacitor, and a second electrode of the second discharging unit is connected to a common ground;
in the first writing stage, the method further comprises:
inputting a high level signal to the first control terminal, and at the same time inputting a high level signal to the fourth control terminal to make the second charging unit in a conductive state, the second discharging unit in a conductive state and the second switching unit in a conductive state to charge the second capacitor;
inputting a low level signal to the fourth control terminal to make the second switching unit in a non-conductive state to discharge the second capacitor, until a voltage across first and second terminals of the second capacitor is dropped to a threshold voltage of the second sub-driver unit;
in the first driving stage, the method further comprises:
inputting a low level signal to the first control terminal to make the second charging unit in a non-conductive state and the second discharging unit in a non-conductive state.

### Claim 15 (depends on 12)

The method according to claim 12, wherein the first writing stage, the first driving stage, the second writing stage and the second driving stage are performed sequentially and cyclically.