# US 2014/0197744 A1 · Organic light emitting display device and method of testing the same

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- Number: US 2014/0197744 A1
- Document ID: US20140197744A1
- Status: Published application
- Kind: A1
- Application number: 13/925,710
- Filed: 2013-06-24
- Published: 2014-07-17
- Earliest claimed: 2013-01-15
- Assignees: Samsung Display SDI Co., Ltd.
- Inventors: Young Woo Choi; Kwangsae Lee
- Web page: https://patentgrep.com/patent/US20140197744A1

## CPC

- H05B 45/60: Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
- G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)}
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- 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
- Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- 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)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

Provided is an organic light emitting display device including: a display unit including a plurality of pixels, each pixel of the pixels including an organic light emitting diode; and a test circuit configured to apply a first signal and a second signal to the display unit and to receive a third signal from the display unit. The test circuit is configured to determine whether or not the display unit is in a normal state based on a voltage level of the third signal when the first and second signals have a first level.

## Claims

### Claim 1

An organic light emitting display device comprising:
a display unit comprising a plurality of pixels, each of the pixels comprising an organic light emitting diode; and
a test circuit configured to apply a first signal and a second signal to the display unit and to receive a third signal from the display unit, wherein the test circuit is configured to determine whether or not the display unit is in a normal state based on a voltage level of the third signal when the first and second signals have a first level.

### Claim 2 (depends on 1)

The organic light emitting display device of claim 1, wherein each of the pixels further comprises:
a first transistor comprising a gate electrode coupled to a first node, the first transistor being coupled between a second node and a third node;
a second transistor comprising a gate electrode configured to receive the first signal, the second transistor being coupled between a data line and the second node;
a third transistor comprising a gate electrode configured to receive the first signal, the third transistor being coupled between the first node and the third node;
a fourth transistor comprising a gate electrode configured to receive the first signal applied to a previous pixel of the pixels, the fourth transistor being coupled between the first node and an initialization voltage;
a fifth transistor including a gate electrode configured to receive the second signal, the fifth transistor being coupled between a source voltage and the second node; and
a sixth transistor including a gate electrode configured to receive the second signal, sixth transistor being coupled between the third node and a fourth node,
wherein the organic light emitting diode is coupled between the fourth node and a ground voltage source.

### Claim 3 (depends on 2)

The organic light emitting display device of claim 2, wherein the test circuit is configured to determine whether or not the fifth transistor is in a normal state based on the voltage level of the third signal through the data line when the first and second signals have the first level.

### Claim 4 (depends on 3)

The organic light emitting display device of claim 3, wherein the test circuit is configured to determine whether or not the fifth transistor is in the normal state based on the third signal being in a low level while the first and second signals are applied and the second and fifth transistors are turned on.

### Claim 5 (depends on 2)

The organic light emitting display device of claim 2, wherein each of the pixels further comprises:
a first capacitor coupled between the source voltage and the first node; and
a capacitor coupled between the gate electrode of the second transistor and the first node.

### Claim 6 (depends on 2)

The organic light emitting display device of claim 2, wherein the first signal is supplied through a gate line and the second signal is supplied through a light emitting control line.

### Claim 7

A method of testing an organic light emitting display device, the method comprising:
applying a first signal and a second signal to a display unit, wherein the display unit comprises a plurality of pixels each having an organic light emitting diode;
receiving a third signal from the display unit; and
determining whether or not the display unit is in a normal state based on a voltage level of the third signal when the first and second signals have a first level.

### Claim 8 (depends on 7)

The method of claim 7, wherein each of the pixels further comprises:
a first transistor comprising a gate electrode coupled to a first node, the first transistor being coupled between a second node and a third node;
a second transistor comprising a gate electrode coupled to the first signal, the second transistor being coupled between a data line and the second node;
a third transistor comprising a gate electrode coupled to the first signal, the third transistor being coupled between the first node and the third node;
a fourth transistor comprising a gate electrode coupled to the first signal applied to a previous pixel of the pixels, the fourth transistor being coupled between the first node and an initialization voltage;
a fifth transistor comprising a gate electrode coupled to the second signal, the fifth transistor being coupled between a source voltage and the second node; and
a sixth transistor comprising a gate electrode coupled to the second signal, the sixth transistor being coupled between the third node and a fourth node, and the organic light emitting diode being coupled between the fourth node and a ground voltage source.

### Claim 9 (depends on 8)

The method of claim 8, wherein determining whether or not the display unit is in the normal state further comprises determining whether or not the fifth transistor is in a normal state based on the voltage level of the third signal provided through the data line when the first and second signals have the first level.

### Claim 10 (depends on 8)

The method of claim 8, wherein determining whether or not the display unit is in the normal state further comprises determining whether or not the fifth transistor is in the normal state based on the third signal being in a low level while the first and second signals are applied and the second and fifth transistors being turned on.

### Claim 11 (depends on 10)

The method of claim 10, wherein the first signal is supplied through a gate line and the second signal is supplied through a light emitting control line.