# US 10,872,567 B2 · Method for driving display device

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- Number: US 10,872,567 B2
- Document ID: US10872567B2
- Status: Granted
- Kind: B2
- Application number: 16/324,309
- Filed: 2018-03-06
- Published: 2020-03-19
- Granted: 2020-12-22
- Earliest claimed: 2017-03-10
- Assignees: KunShan Go-Visionox Opto-Electronics Co., Ltd
- Applicants: Kunshan Go-Visionox Opto-Electronics Co., Ltd.
- Inventors: Shuhuan Zhang; Haibin Jiang; Xinquan Chen
- Web page: https://patentgrep.com/patent/US10872567B2

## CPC

- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G09G 3/2007: {Display of intermediate tones}
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED]
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2330/00: Aspects of power supply; Aspects of display protection and defect management
- G09G 2330/02: Details of power systems and of start or stop of display operation
- 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 application discloses a method for driving a display apparatus. The display apparatus includes an OLED and a driver transistor. An anode of the OLED is connected to a source of the driver transistor, a drain of the driver transistor is connected to a positive power supply, a cathode of the OLED is connected to a negative power supply, and a voltage difference between the positive power supply and the negative power supply is in a range from 7.1 V to 9.6 V.

## Claims

### Claim 1

A method for driving a display apparatus, wherein the display apparatus comprises an OLED, a driver transistor and first to fourth switch transistors, the method comprising:
connecting a source of the first switch transistor to a data signal power supply, connecting a drain of the first switch transistor to a drain of the driver transistor and connecting a gate of the first switch transistor to a second scan power supply; connecting a source of the second switch transistor to the drain of the driver transistor, connecting a drain of the second switch transistor to a positive power supply and connecting a gate of the second switch transistor to an emission power supply; connecting a source of the third switch transistor to a reference power supply, connecting a drain of the third switch transistor to a gate of the driver transistor and connecting a gate of the third switch transistor to a first scan power supply; connecting a source of the fourth switch transistor to a gate of the driver transistor, connecting a drain of the fourth switch transistor to a source of the fifth switch transistor and connecting a gate of the fourth switch transistor to the second scan power supply;
connecting a cathode of the OLED to a negative power supply; and
conducting a voltage difference between the positive power supply and the negative power supply in a range from 7.1 V to 9.6 V.

### Claim 2 (depends on 1)

The method for driving a display apparatus according to claim 1, wherein a voltage provided by the positive power supply has a fixed value, and a voltage provided by the negative power supply is an adjustable voltage.

### Claim 3 (depends on 2)

The method for driving a display apparatus according to claim 2, wherein the voltage provided by the positive power supply ranges from 4 V to 5 V.

### Claim 4 (depends on 2)

The method for driving a display apparatus according to claim 2, wherein the voltage provided by the negative power supply ranges from −5 V to −2.5 V.

### Claim 5 (depends on 2)

The method for driving a display apparatus according to claim 2, wherein the voltage difference between the positive power supply and the negative power supply is configured in a range from 8.1 V to 9.1 V.

### Claim 6 (depends on 5)

The method for driving a display apparatus according to claim 5, wherein the voltage provided by the negative power supply ranges from −4.5 V to −3.5 V.

### Claim 7 (depends on 1)

The method for driving a display apparatus according to claim 1, wherein a voltage provided by the positive power supply is an adjustable voltage, and a voltage provided by the negative power supply has a fixed value.

### Claim 8 (depends on 1)

The method for driving a display apparatus according to claim 1, wherein a drain-source voltage of the driver transistor is as follows:
Vds=a voltage of the positive power supply−a voltage of the negative power supply−Voled,
Vds is the drain-source voltage of the driver transistor, and Voled is a voltage between two terminals of the OLED.

### Claim 9 (depends on 1)

The method for driving a display apparatus according to claim 1, wherein the display apparatus further comprises a capacitor, a gate of the driver transistor connected to the positive power supply through the capacitor.

### Claim 10 (depends on 1)

The method for driving a display apparatus according to claim 1, further comprising: connecting a source of the fifth switch transistor to a source of the driver transistor, connecting a drain of the fifth switch transistor to an anode of the OLED and connecting a gate of the fifth switch transistor to the emission power supply; connecting a source of the sixth switch transistor to a reference power supply, connecting a drain of the sixth switch transistor to the anode of the OLED and connecting a gate of the sixth switch transistor to the first scan power supply.