# US 12,223,911 B2 · Pixel, organic light emitting display device using the same, and method of driving the organic light emitting display device

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- Number: US 12,223,911 B2
- Document ID: US12223911B2
- Status: Granted
- Kind: B2
- Application number: 18/591,712
- Filed: 2024-02-29
- Published: 2024-06-20
- Granted: 2025-02-11
- Earliest claimed: 2016-06-17
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Jin Tae Jeong; Min Ku Lee; Ji Hyun Ka; Tae Hoon Kwon; Seung Kyu Lee; Seung Ji Cha
- Web page: https://patentgrep.com/patent/US12223911B2

## CPC

- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G09G 3/3225: using an active matrix
- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2310/0216: Interleaved control phases for different scan lines in the same sub-field, e.g. initialization, addressing and sustaining in plasma displays that are not simultaneous for all scan lines
- G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage
- G09G 2310/0262: The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
- G09G 2320/0214: with crosstalk due to leakage current of pixel switch in active matrix panels
- G09G 2320/0238: Improving the black level
- G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements
- 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 pixel includes an organic light emitting diode (OLED), a pixel circuit, and first and second transistors. The OLD includes a cathode electrode connected to a second power source. The pixel circuit includes a driving transistor having a gate electrode initialized by a third power source. The driving transistor controls the amount of current flowing from a first power source to the second power source via the OLED. The first transistor is connected between a fourth power source and the second power source and an anode electrode of the OLED. The first transistor is turned on based on a scan signal is supplied to a scan line. The second transistor is connected between a data line and the pixel circuit. The second transistor is turned on when the scan signal is supplied to the ith scan line.

## Claims

### Claim 1

A pixel comprising:
a first transistor connected to a first node and having a gate electrode connected to a second node, the first node connected to a first power source;
a light emitting element having a first electrode connected to a third node and a second electrode connected to a second power source, the third node connected between the first transistor and the light emitting element;
a second transistor connected between a data line and the first node and configured to be turned on in response to a first signal enabled in a first time period;
a third transistor connected between the second node and a first initializing power line to initialize a voltage of the gate electrode of the first transistor;
a fourth transistor connected between the third node and the second node to electrically connect the third node and the gate electrode of the first transistor to each other;
a fifth transistor connected between the first node and the first power source and configured to be turned on in response to a second signal enabled in a second time period; and
a sixth transistor connected between the first electrode of the light emitting element and a second initializing power line to initialize a voltage of the first electrode;
wherein the first initializing power line has a voltage greater than a voltage of the second initializing power line, and
wherein the second time period does not overlap the first time period.

### Claim 2 (depends on 1)

The pixel of claim 1, further comprising a seventh transistor connected between the third node and the first electrode of the light emitting element and configured to be turned on in response to the second signal.

### Claim 3 (depends on 1)

The pixel of claim 1, further comprising a capacitor connected between the first power source and the second node.

### Claim 4 (depends on 1)

The pixel of claim 1, wherein the first node is directly connected to the first transistor, the second transistor, and the fifth transistor.

### Claim 5 (depends on 1)

The pixel of claim 1, wherein the third node is directly connected to the first transistor and the fourth transistor.

### Claim 6 (depends on 1)

The pixel of claim 1, wherein the sixth transistor has a gate electrode connected to a scan line configured to supply the first signal.

### Claim 7 (depends on 1)

The pixel of claim 1, wherein the second transistor has a gate electrode connected to a first scan line configured to supply the first signal, and wherein the third transistor has a gate electrode connected to a second scan line different from the first scan line.

### Claim 8 (depends on 1)

The pixel of claim 1, wherein the fifth transistor has a turn-on period that does not overlap a turn-on period of the second transistor.

### Claim 9 (depends on 1)

The pixel of claim 1, wherein the voltage of the second initializing power line is greater than a voltage of the second power source.

### Claim 10 (depends on 1)

The pixel of claim 1, wherein the voltage of the first initializing power line is lower than a voltage of a data signal of the data line.

### Claim 11

A display device comprising:
pixels connected to scan lines, data lines, and emission control lines;
a scan driver to supply scan signals to the scan lines;
an emission control driver to supply emission control signals to the emission control lines; and
a data driver to supply data signals to the data lines,
one of the pixels comprises:
a first transistor connected to a first node and having a gate electrode connected to a second node, the first node connected to a first power source;
a light emitting element having a first electrode connected to a third node and a second electrode connected to a second power source, the third node connected between the first transistor and the light emitting element;
a second transistor connected between one of the data lines and the first node and configured to be turned on in response to one of the scan signals;
a third transistor connected between the second node and a first initializing power line to initialize a voltage of the gate electrode of the first transistor;
a fourth transistor connected between the third node and the second node to electrically connect the third node and the gate electrode of the first transistor to each other;
a fifth transistor connected between the first node and the first power source and configured to be turned on in response to one of the emission control signals; and
a sixth transistor connected between the first electrode of the light emitting element and a second initializing power line to initialize a voltage of the first electrode;
wherein the first initializing power line has a voltage greater than a voltage of the second initializing power line, and
wherein:
the one of the scan signals is enabled in a first time period;
the one of the emission control signals is enabled in a second time period; and
the second time period does not overlap the first time period.

### Claim 12 (depends on 11)

The display device of claim 11, wherein the first node is directly connected to the first transistor, the second transistor, and the fifth transistor.

### Claim 13 (depends on 11)

The display device of claim 11, wherein the third node is directly connected to the first transistor and the fourth transistor.

### Claim 14 (depends on 11)

The display device of claim 11, wherein the sixth transistor has a gate electrode connected to one of the scan lines configured to supply the one of the scan signals.

### Claim 15 (depends on 11)

The display device of claim 11, wherein the second transistor has a gate electrode connected to a first one of the scan lines configured to supply the one of the signal signals, and,
wherein the third transistor has a gate electrode connected to a second one of the scan lines different from the first one of the scan lines.

### Claim 16 (depends on 11)

The display device of claim 11, further comprising a seventh transistor connected between the third node and the first electrode of the light emitting element and configured to be turned on in response to the one of the emission control signals.