# US 8,570,249 B2 · Pixel coupled to three horizontal lines and organic light emitting display device using the same

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- Number: US 8,570,249 B2
- Document ID: US8570249B2
- Status: Granted
- Kind: B2
- Application number: 12/828,036
- Filed: 2010-06-30
- Published: 2011-04-21
- Granted: 2013-10-29
- Earliest claimed: 2009-10-15
- Assignees: Samsung Display Co., Ltd.
- Applicants: Sam-Il Han
- Inventors: Sam-Il Han
- Web page: https://patentgrep.com/patent/US8570249B2

## CPC

- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0852: being a dynamic memory with more than 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 2320/043: Preventing or counteracting the effects of ageing
- 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 pixel and organic light emitting display device. The pixel includes an organic light emitting diode, first through fourth transistors, and a second capacitor. The fourth transistor is for controlling an amount of current flowing through the organic light emitting diode. A first transistor is coupled between a second terminal of the second capacitor and a data line and is configured to turn on in response to a scan signal supplied to an i-th scan line. A second transistor is coupled between a first terminal of the second capacitor and an initial power source and is configured to turn on in response to an other scan signal supplied to an (i−1)-th scan line. A third transistor is coupled between the second terminal of the second capacitor and a reference power source and is configured to turn off in response to an emission control signal supplied to an (i+1)-th emission control line.

## Claims

### Claim 1

A pixel located on an i-th horizontal line of a plurality of horizontal lines, where i is a positive integer and each of the horizontal lines includes a scan line and an emission control line, the pixel being coupled to the scan line of an (i−1)-th horizontal line of the horizontal lines, the scan line of the i-th horizontal line, the emission control line of the i-th horizontal line, and the emission control line of an (i+1)-th horizontal line of the horizontal lines, the pixel comprising:
an organic light emitting diode having a cathode electrode coupled to a second power source, an emission of the organic light emitting diode being controlled by an emission control signal supplied to the emission control line of the i-th horizontal line;
a fourth transistor for controlling an amount of current flowing to the second power source from a first power source via the organic light emitting diode;
a first capacitor having a first terminal coupled to a gate electrode of the fourth transistor;
a first transistor coupled between a second terminal of the first capacitor and a data line, and configured to turn on in response to a scan signal supplied to the scan line of the i-th horizontal line;
a second transistor coupled between the first terminal of the first capacitor and an initial power source, and configured to turn on in response to a scan signal supplied to the scan line of the (i−1)-th horizontal line; and
a third transistor coupled between the second terminal of the first capacitor and a reference power source, and configured to turn off in response to an emission control signal supplied to the emission control line of the (i+1)-th horizontal line.

### Claim 2 (depends on 1)

The pixel of claim 1, wherein the initial power source has a voltage at which the fourth transistor is turned on.

### Claim 3 (depends on 2)

The pixel of claim 2, wherein the initial power source has a voltage lower than that of the first power source.

### Claim 4 (depends on 1)

The pixel of claim 1, wherein the amount of current is controlled by a voltage difference between a voltage of a data signal supplied to the data line and a voltage of the reference power source.

### Claim 5 (depends on 1)

The pixel of claim 1, further comprising:
a second capacitor coupled between the first terminal of the first capacitor and the first power source;
a fifth transistor for diode-connecting the fourth transistor when the scan signal is supplied to the scan line of the i-th horizontal line; and
a sixth transistor coupled between the fourth transistor and the organic light emitting diode, and configured to turn off in response to the emission control signal supplied to the emission control line of the i-th horizontal line.

### Claim 6

An organic light emitting display device comprising:
a scan driver for sequentially supplying scan signals to scan lines and sequentially supplying emission control signals to emission control lines;
a data driver for supplying data signals to data lines in synchronization with the scan signals; and
pixels located at crossing regions of the data lines, the scan lines, and the emission control lines,
wherein each of the pixels is located on an i-th horizontal line of a plurality of horizontal lines, where i is a positive integer and each of the horizontal lines includes one of the scan lines and one of the emission control lines, coupled to the one of the scan lines of an (i−1)-th horizontal line of the horizontal lines, the one of the scan lines of the i-th horizontal line, the one of the emission control lines of the i-th horizontal line, and the one of the emission control lines of an (i+1)-th horizontal line of the horizontal lines, and comprises:
an organic light emitting diode having a cathode electrode coupled to a second power source, an emission of the organic light emitting diode being controlled by one of the emission control signals supplied to the one of the emission control lines of the i-th horizontal line;
a fourth transistor for controlling an amount of current to the second power source from a first power source via the organic light emitting diode;
a first capacitor having a first terminal coupled to a gate electrode of the fourth transistor;
a first transistor coupled between a second terminal of the first capacitor and one of the data lines, and configured to turn on in response to one of the scan signals supplied to the one of the scan lines of the i-th horizontal line;
a second transistor coupled between the first terminal of the first capacitor and an initial power source, and configured to turn on in response to one of the scan signals supplied to the one of the scan lines of the (i−1)-th horizontal line; and
a third transistor coupled between the second terminal of the first capacitor and a reference power source, and configured to turn off in response to one of the emission control signals supplied to the one of the emission control lines of the (i+1)-th horizontal line.

### Claim 7 (depends on 6)

The organic light emitting display device of claim 6, wherein the initial power source has a voltage at which the fourth transistor is turned on.

### Claim 8 (depends on 7)

The organic light emitting display device of claim 7, wherein the initial power source has a voltage lower than that of the first power source.

### Claim 9 (depends on 6)

The organic light emitting display device of claim 6, wherein the amount of current is controlled by a voltage difference between a voltage of one of the data signals supplied to the one of the data lines and a voltage of the reference power source.

### Claim 10 (depends on 6)

The organic light emitting display device of claim 6, each of the pixels located on the i-th horizontal line further comprising:
a second capacitor coupled between the first terminal of the first capacitor and the first power source;
a fifth transistor for diode-connecting the fourth transistor when the one of the scan signals is supplied to the one of the scan lines of the i-th horizontal line; and
a sixth transistor coupled between the fourth transistor and the organic light emitting diode, and configured to turn off in response to the one of the emission control signals supplied to the one of the emission control lines of the i-th horizontal line.

### Claim 11 (depends on 6)

The organic light emitting display device of claim 6, wherein the scan driver is configured to supply the one of the emission control signals to the one of the emission control lines of the i-th horizontal line concurrently with the one of the scan signals supplied to the one of the scan lines of the (i−1)-th horizontal line and the one of the scan signals supplied to the one of the scan lines of the i-th horizontal line.