# US 12,190,809 B2 · Display device and method for driving the same

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- Number: US 12,190,809 B2
- Document ID: US12190809B2
- Status: Granted
- Kind: B2
- Application number: 18/238,812
- Filed: 2023-08-28
- Published: 2024-06-27
- Granted: 2025-01-07
- Earliest claimed: 2022-12-26
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Jihoon Ha
- Web page: https://patentgrep.com/patent/US12190809B2

## CPC

- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/2081: {with combination of amplitude modulation and time modulation (space and time error diffusion G09G3/2066)}
- G09G 3/2096: {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)}
- G09G 3/2011: {by amplitude modulation}
- G09G 3/2014: {by modulation of the duration of a single pulse during which the logic level remains constant}
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
- 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 2320/0626: for control of overall brightness
- G09G 2320/0633: by amplitude modulation of the brightness of the illumination source
- G09G 2320/064: by time modulation of the brightness of the illumination source
- G09G 2330/021: Power management, e.g. power saving
- 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 a method for driving the same are capable of driving a light-emitting element while a decrease in external quantum efficiency (EQE) is suppressed even when the light-emitting element is used in a small display device. The display device may include a display panel including at least one of a first sub-pixel, a second sub-pixel and a third sub-pixel; and a driver configured to control a light-emission operation of the at least one of the first to third sub-pixels, wherein the driver is configured to control the light-emission operation of the at least one of the first to third sub-pixels so that a data voltage value set in a first control mode is applied, in a fixed manner, to the at least one of the first to third sub-pixels in a second control mode.

## Claims

### Claim 1

A display device comprising:
a display panel including at least one of a first sub-pixel, a second sub-pixel and a third sub-pixel; and
a driver configured to control a light-emission operation of the at least one of the first to third sub-pixels,
wherein the driver is configured to control the light-emission operation of the at least one of the first to third sub-pixels so that a data voltage value set in a first control mode is applied to the at least one of the first to third sub-pixels for a pulse width set in a second control mode, and
wherein in the second control mode, a current value and the data voltage value of the at least one of the first to third sub-pixels are fixed respectively to a second specific value and a third specific value, and the pulse width is variable.

### Claim 2 (depends on 1)

The display device of claim 1, wherein in the first control mode, the pulse width is fixed to a first specific value, and each of the current value and the data voltage value of the at least one of the first to third sub-pixels is variable.

### Claim 3 (depends on 2)

The display device of claim 2, wherein in the first control mode, the driver is configured to fix the pulse width to the first specific value, set the current value of the at least one of the first to third sub-pixels to be in a range of about 30 to 60 milliampere (mA), and set the data voltage value of the at least one of the first to third sub-pixels to be in a range of about 1 to 2 volts (V).

### Claim 4 (depends on 2)

The display device of claim 2, wherein in the second control mode, the driver is configured to fix the data voltage value and the current value of the at least one of the first to third sub-pixels respectively to the second and third specific values, and set the pulse width to be in a range of about 10 to 1,000 microseconds (μs).

### Claim 5 (depends on 1)

The display device of claim 1, wherein each of the first to third sub-pixels includes a micro-LED chip.

### Claim 6 (depends on 5)

The display device of claim 5, wherein the driver is embodied as a micro driver configured to control light-emission operation of the micro-LED chip of the at least one of the first to third sub-pixels.

### Claim 7 (depends on 1)

The display device of claim 1, wherein each of the first to third sub-pixels includes an organic light-emitting diode (OLED).

### Claim 8 (depends on 1)

The display device of claim 1, wherein the first to third sub-pixels are configured to emit light of different colors, respectively.

### Claim 9 (depends on 8)

The display device of claim 8, wherein a sub-pixel selected from among the first sub-pixel, the second sub-pixel, and the third sub-pixel is configured to emit light of one of red, blue, and green colors.

### Claim 10 (depends on 1)

The display device of claim 1, wherein each of the first to third sub-pixels is electrically connected to a driving circuit for driving light-emission of each sub-pixel.

### Claim 11 (depends on 10)

The display device of claim 10, wherein the driving circuit includes:
a light-emission transistor connected to each sub-pixel and configured to be turned on for the pulse width set in the second control mode; and
a driving transistor connected to and disposed between the light-emission transistor and a data voltage line, wherein the driving transistor is configured to switch application of the data voltage set in the first control mode to each sub-pixel.

### Claim 12 (depends on 11)

The display device of claim 11, wherein the driver is configured to:
upon receiving a light-emitting control command from a timing controller, turn on the driving transistor so that the data voltage set in the first control mode is applied to the each sub-pixel; and
turn on the light-emission transistor so that the light-emission transistor is switched in the pulse width set in the second control mode.

### Claim 13 (depends on 10)

The display device of claim 10, wherein a plurality of power lines, a plurality of scan lines, a reference voltage line, a data voltage line, and a light-emitting control line are disposed in the driving circuit.

### Claim 14 (depends on 1)

The display device of claim 1, wherein the driver is configured to:
when an image signal is applied thereto, generate a coordinate value of each sub-pixel to emit light among the first to third sub-pixels; and
apply the data voltage set in the first control mode to each sub-pixel corresponding to the generated coordinate value for the pulse width set in the second control mode.

### Claim 15

A method for driving a display device, wherein the display device includes:
a display panel including at least one of a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel;
a light-emission transistor connected to each of the first to fourth sub-pixels;
a driving transistor connected to the light-emission transistor; and
a driver configured to control a light-emission operation of the at least one of the first to fourth sub-pixels,
wherein the method comprises:
receiving a light-emitting control signal in response to application of an image signal from a timing controller;
turning on the driving transistor;
switching the driving transistor so that a data voltage set in a first control mode is applied to the at least one of the first to fourth sub-pixels;
turning on the light-emission transistor;
switching the light-emission transistor for a set pulse width in a second control mode; and
emitting a light of the at least one of the first to fourth sub-pixels in the pulse width set in the second control mode by the data voltage set in the first control mode,
wherein in the second control mode, the current value and the data voltage value of the at least one of the first to fourth sub-pixels are fixed respectively to a first specific value and a second specific value, and the pulse width is variable.

### Claim 16 (depends on 15)

The method of claim 15, wherein in the switching the driving transistor, in the first control mode, the driver fixes the pulse width to about 1,000 microseconds (μs), sets the current value of the at least one of the first to fourth sub-pixels to be in a range of about 30 to 60 milliampere (mA), and sets the data voltage value of the at least one of the first to fourth sub-pixels to be in a range of about 1 to 2 volts (V).

### Claim 17 (depends on 15)

The method of claim 15, wherein in the switching the light-emission transistor, in the second control mode, the driver fixes the data voltage value of the at least one of the first to fourth sub-pixels to about 1 volt (V), fixes the current value of the at least one of the first to fourth sub-pixels to about 30 milliamperes (mA), and sets the pulse width to be in a range of about 10 to 1,000 microseconds (μs).

### Claim 18 (depends on 1)

The display device of claim 1, wherein the first control mode is a high luminance operation of the at least one of the first to third sub-pixels.

### Claim 19 (depends on 18)

The display device of claim 18, wherein the second control mode is a low luminance operation mode of the at least one of the first to third sub-pixels.

### Claim 20 (depends on 2)

The display device of claim 2, wherein a maximum pulse width of the second control mode is set to the first specific value.