# US 12,762,999 B2 · Display device and driving method thereof

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- Number: US 12,762,999 B2
- Document ID: US12762999B2
- Status: Granted
- Kind: B2
- Application number: 18/660,039
- Filed: 2024-05-09
- Published: 2025-01-02
- Granted: 2026-10-13
- Earliest claimed: 2023-06-30
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Seungjin Yoo; HyunSuk Lee; Hyungi Hong
- Web page: https://patentgrep.com/patent/US12762999B2

## CPC

- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
- G09G 2310/0275: Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
- 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 display device and driving method thereof are disclosed. A display device is provided, which comprises a plurality of pixels and each of the plurality of pixels includes a first switching transistor operating depending on a scan signal, a second switching transistor operating depending on a sensing signal, a driving transistor including a gate electrode connected to a first node, a source electrode connected to a second node, and a drain electrode connected to a low potential voltage line, a light emitting device including an anode connected to a high potential voltage line and a cathode connected to the second node, and a storage capacitor connected between the first node and the second node.

## Claims

### Claim 1

A method of driving a display device including a display panel on which a gate line, a sensing line, a data line, and a plurality of pixels are disposed, the method comprising:
turning on a first switching transistor and a second switching transistor to initialize a voltage stored in a storage capacitor through an initialization voltage applied to the data line, during a first period,
sensing a threshold voltage of a driving transistor during a second period,
applying a data voltage to the data line during a third period,
compensating the threshold voltage of the driving transistor during a fourth period, and
emitting light by a light emitting element during a fifth period.

### Claim 2 (depends on 1)

The method of driving the display device of claim 1, wherein in the first period, the initialization voltage applied to the data line is supplied to a gate electrode of the driving transistor through the first switching transistor, a high potential voltage is supplied to a source electrode of the driving transistor through the second switching transistor, and the storage capacitor is initialized to a differential voltage between the initialization voltage and the high potential voltage.

### Claim 3 (depends on 1)

The method of driving the display device of claim 1, wherein in the second period, the first switching transistor maintains a turn-on state, the second switching transistor changes from a turn-on state to a turn-off state, a voltage of the gate electrode of the driving transistor is maintained, and a voltage of the source electrode of the driving transistor decreases.

### Claim 4 (depends on 3)

The method of driving the display device of claim 3, wherein a magnitude of a gate-source voltage of the driving transistor is equal to a magnitude of a threshold voltage of the driving transistor in the second period.

### Claim 5 (depends on 3)

The method of driving the display device of claim 3, wherein the storage capacitor stores the threshold voltage of the driving transistor in the second period.

### Claim 6 (depends on 1)

The method of driving the display device of claim 1, wherein in the third period, the first switching transistor changes from a turn-on state to a turn-off state, the second switching transistor maintains a turn-off state, and the data voltage different from the initialization voltage is applied to the data line.

### Claim 7 (depends on 1)

The method of driving the display device of claim 1, wherein in the fourth period, the first switching transistor changes from a turn-off state to a turn-on state, the second switching transistor maintains a turn-off state, and the data voltage applied to the data line through the first switching transistor is supplied to a gate electrode of the driving transistor.

### Claim 8 (depends on 1)

The method of driving the display device of claim 1, wherein in the fifth period, the first switching transistor changes from a turn-on state to a turn-off state, the second switching transistor maintains a turn-off state, and the light emitting element emits light according to a current having a current value based on the initialization voltage and the data voltage.

### Claim 9 (depends on 1)

The method of driving the display device of claim 1, wherein the first period, the second period, the third period and the fourth period are included in each of a first horizontal period and a second horizontal period, and
the first horizontal period and the second horizontal period are consecutive.

### Claim 10 (depends on 9)

The method of driving the display device of claim 9, wherein the first period, the second period, the third period, and the fourth period are consecutive.

### Claim 11 (depends on 9)

The method of driving the display device of claim 9, wherein the plurality of pixels includes a first pixel, a second pixel, a third pixel, and fourth pixel,
the gate line includes a first gate line and a second gate line,
the sensing line includes a first sensing line and a second sensing line,
the first gate line and the first sensing line supply signals to the first pixel and the second pixel in the first horizontal period, and
the second gate line and the second sensing line supply signals to the third pixel and the fourth pixel in the second horizontal period.

### Claim 12 (depends on 1)

The method of driving the display device of claim 1, wherein the first period and the second period are included in a first horizontal period,
the second period, the third period and the fourth period are included in a second horizontal period, and
the first horizontal period and the second horizontal period are consecutive.

### Claim 13 (depends on 12)

The method of driving the display device of claim 12, wherein the plurality of pixels includes a first pixel, a second pixel, a third pixel, and fourth pixel,
the gate line includes a first gate line and a second gate line, and
the sensing line includes a first sensing line and a second sensing line,
wherein in the first horizontal period, the first gate line and the first sensing line supply signals to the first pixel and the second pixel, and the second gate line and the second sensing line supply signals to the third pixel and the fourth pixel.

### Claim 14 (depends on 13)

The method of driving the display device of claim 13, wherein in the first horizontal period, the first gate line and the second gate line supply a same signal, and
the first sensing line and the second sensing lines supply a same signal.

### Claim 15 (depends on 12)

The method of driving the display device of claim 12, wherein the third period includes a 3-1th period and a 3-2th period in the second horizontal period,
the fourth period includes a 4-1th period and a 4-2th period in the second horizontal period,
the first gate line and the first sensing line supply signals to the first pixel and the second pixel in each of the 3-1th period and the 4-1th period,
the second gate line and the second sensing line supply signals to the third pixel and the fourth pixel in each of the 3-2th period and the 4-2th period.