# US 11,910,662 B2 · Display device using a simultaneous light emitting method and driving method thereof

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- Number: US 11,910,662 B2
- Document ID: US11910662B2
- Status: Granted
- Kind: B2
- Application number: 16/886,860
- Filed: 2020-05-29
- Published: 2020-12-17
- Granted: 2024-02-20
- Earliest claimed: 2019-06-12
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Hong Soo Kim; Bon Seog Gu; Woo Mi Bae
- Web page: https://patentgrep.com/patent/US11910662B2

## CPC

- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED]
- G09G 3/3266: Details of drivers for scan electrodes
- G09G 3/3275: Details of drivers for data electrodes
- H10K 59/1213: {the pixel elements being TFTs}
- H10K 59/1216: {the pixel elements being capacitors}
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0686: with two or more screen areas displaying information with different brightness or colours
- G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD
- 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)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display device includes a first pixel coupled to a first scan line and a data line, and including a first light emitting diode having a cathode coupled to a first power line, and a second pixel coupled to a second scan line and the data line, and including a second light emitting diode having a cathode coupled to a second power line. The first scan line and the second scan line are different from each other. The first power line and the second power line are different from each other. Emission start times and emission end times of the first pixel and the second pixel are synchronized.

## Claims

### Claim 1

A display device comprising:
a first area including first pixels coupled to first scan lines and data lines, each of the first pixels coupled to a corresponding first scan line among the first scan lines and a corresponding data line among the data lines, and including a first light emitting diode having a cathode directly coupled to a first power line; and
a second area including second pixels coupled to second scan lines and the data lines, each of the second pixels being coupled to a corresponding second scan line among the second scan lines and the corresponding data line among the data lines, and including a second light emitting diode having a cathode directly coupled to a second power line,
wherein the first scan lines and the second scan lines are different from each other so that the first area and the second area are not overlapped,
wherein the first power line and the second power line are different from each other,
wherein emission start times and emission end times of the first pixels and the second pixels are synchronized, and
wherein voltage levels of the first power line and the second power line are different from each other in a period between the emission start times and the emission end times.

### Claim 2 (depends on 1)

The display device of claim 1, wherein each of the first pixels and the second pixels further includes a first transistor including a gate electrode coupled to a first node, a first electrode coupled to a third power line, and a second electrode coupled to a second node, and
wherein the third power line is commonly coupled to the first pixels and the second pixels.

### Claim 3 (depends on 2)

The display device of claim 2, wherein each of the first pixels and the second pixels further includes a second transistor including a first electrode coupled to the first node and a second electrode coupled to a third node,
wherein a gate electrode of the second transistor of each of the first pixels is coupled to the corresponding first scan line, and
wherein a gate electrode of the second transistor of each of the second pixels is coupled to the corresponding second scan line.

### Claim 4 (depends on 3)

The display device of claim 3, wherein each of the first pixels and the second pixels further includes a third transistor including a gate electrode coupled to a control line, a first electrode coupled to the third node, and a second electrode coupled to the second node, and
wherein the control line is commonly coupled to the first pixels and the second pixels.

### Claim 5 (depends on 4)

The display device of claim 4, wherein each of the first pixels and the second pixels further includes a first capacitor including a first electrode coupled to the first node and a second electrode coupled to an initialization line, and
wherein the initialization line is commonly coupled to the first pixels and the second pixels.

### Claim 6 (depends on 5)

The display device of claim 5, wherein each of the first pixels and the second pixels further includes a second capacitor including a first electrode coupled to the third node and a second electrode coupled to the corresponding data line.

### Claim 7 (depends on 6)

The display device of claim 6, wherein, in a data write period, a time at which a scan signal having a turn-on level is supplied to the corresponding first scan line is earlier than that at which a scan signal having the turn-on level is supplied to the corresponding second scan line, and
wherein, in the period between the emission start times and the emission end times, a voltage applied to the first power line is greater than that applied to the second power line.

### Claim 8 (depends on 1)

The display device of claim 1, wherein each of the first pixels and the second pixels further includes a first transistor including a gate electrode coupled to a first node, a first electrode, and a second electrode coupled to a second node,
wherein the first electrode of the first transistor of each of the first pixels is coupled to a third power line,
wherein the first electrode of the first transistor of each of the second pixels is coupled to a fourth power line, and
wherein the third power line and the fourth power line are different from each other.

### Claim 9 (depends on 8)

The display device of claim 8, wherein, in a data write period, at a time at which a scan signal having a turn-on level is supplied to the corresponding first scan line is earlier than that at which a scan signal having the turn-on level is supplied to the corresponding second scan line, and
wherein, in the period between the emission start times and the emission end times, a voltage applied to the first power line is greater than that applied to the second power line, and a voltage applied to the third power line is smaller than that applied to the fourth power line.

### Claim 10

A display device comprising:
a first area including first pixels coupled to first scan lines and data lines, each of the first pixels coupled to a corresponding first scan line among the first scan lines and a corresponding data line among the data lines; and
a second area including second pixels coupled to second scan lines and the data lines, each of the second pixels being coupled to a corresponding second scan line among the second scan lines and a corresponding data line among the data lines,
wherein the first scan lines and the second scan lines are different from each other so that the first area and the second area are not overlapped,
wherein each of the first pixels and the second pixels includes a first transistor including a gate electrode coupled to a first node, a first electrode, and a second electrode directly coupled to a second node,
wherein the first electrode of the first transistor of each of the first pixels is directly coupled to a first power line,
wherein the first electrode of the first transistor of each of the second pixels is directly coupled to a second power line,
wherein the first power line and the second power line are different from each other,
wherein emission start times and emission end times of the first pixels and the second pixels are synchronized,
wherein voltage levels of the first power line and the second power line are different from each other in a period between the emission start times and the emission end times, and
wherein each of the first pixels and the second pixels further includes a light emitting diode including an anode directly coupled to the second node and a cathode coupled to a third power line.

### Claim 11 (depends on 10)

The display device of claim 10, wherein the third power line is commonly coupled to the first pixels and the second pixels.

### Claim 12 (depends on 11)

The display device of claim 11, wherein each of the first pixels and the second pixels further includes a second transistor including a first electrode coupled to the first node and a second electrode coupled to a third node,
wherein a gate electrode of the second transistor of each of the first pixels is coupled to the corresponding first scan line, and
wherein a gate electrode of the second transistor of each of the second pixels is coupled to the corresponding second scan line.

### Claim 13 (depends on 12)

The display device of claim 12, wherein each of the first pixels and the second pixels further includes a third transistor including a gate electrode coupled to a control line, a first electrode coupled to the third node, and a second electrode coupled to the second node, and
wherein the control line is commonly coupled to the first pixels and the second pixels.

### Claim 14 (depends on 13)

The display device of claim 13, wherein each of the first pixels and the second pixels further includes a first capacitor including a first electrode coupled to the first node and a second electrode coupled to an initialization line, and
wherein the initialization line is commonly coupled to the first pixels and the second pixels.

### Claim 15 (depends on 14)

The display device of claim 14, wherein each of the first pixels and the second pixels further includes a second capacitor including a first electrode coupled to the third node and a second electrode coupled to the corresponding data line.

### Claim 16 (depends on 15)

The display device of claim 15, wherein, in a data write period, a time at which a scan signal having a turn-on level is supplied to the corresponding first scan line is earlier than that at which a scan signal having the turn-on level is supplied to the corresponding second scan line, and
wherein, in the period between the emission start times and the emission end times, a voltage applied to the first power line is smaller than that applied to the second power line.

### Claim 17

A method for driving a display device,
wherein the display device includes:
a first area including first pixels coupled to first scan lines and data lines, each of the first pixels being coupled to a corresponding first scan line among the first scan lines and a corresponding data line among the data lines, and including a first light emitting diode having a cathode coupled to a first power line; and
a second area including second pixels coupled to second scan lines and the data lines, each of the second pixels being coupled to a corresponding second scan line among the second scan lines and the corresponding data line among the data lines, and including a second light emitting diode having a cathode coupled to a second power line,
wherein the first scan lines and the second scan lines are different from each other so that the first area and the second area are not overlapped,
wherein the method comprises:
decreasing voltages of the first power line and the second power line at substantially the same time; and
increasing the voltages of the first power line and the second power line at substantially the same time, and
wherein, in the decreasing, a voltage applied to the first power line is greater than that applied to the second power line.

### Claim 18 (depends on 17)

The method of claim 17, wherein, in the increasing, the voltage applied to the first power line and the voltage applied to the second power line are equal to each other.

### Claim 19 (depends on 17)

The method of claim 17, wherein, in a data write period, a time at which a scan signal having a turn-on level is supplied to the corresponding first scan line is earlier than that at which a scan signal having the turn-on level is supplied to the corresponding second scan line.

### Claim 20 (depends on 19)

The method of claim 19, wherein, in an initialization period, a time at which a scan signal having the turn-on level is supplied to the corresponding first scan line is substantially equal to that at which a scan signal having the turn-on level is supplied to the corresponding second scan line.