# US 9,040,999 B2 · Organic light emitting display device

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- Number: US 9,040,999 B2
- Document ID: US9040999B2
- Status: Granted
- Kind: B2
- Application number: 14/050,503
- Filed: 2013-10-10
- Published: 2014-12-04
- Granted: 2015-05-26
- Earliest claimed: 2013-05-29
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Yul-Kyu Lee; Kyu-Sik Cho; Sun Park; Ji-Hoon Song
- Web page: https://patentgrep.com/patent/US9040999B2

## CPC

- H10K 59/124: Insulating layers formed between TFT elements and OLED elements
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- G09G 2300/043: Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
- G09G 2300/0465: Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
- 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 2310/0205: Simultaneous scanning of several lines in flat panels
- G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- 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

An organic light emitting display device includes an active layer of a transistor disposed on a substrate, a gate electrode disposed on the active layer and on a first insulation layer, a second insulation layer which is disposed on the gate electrode and exposes a source area and a drain area of the active layer, a drain electrode which is disposed on the second insulation layer and is connected to an exposed area of the drain area, a third insulation layer on the drain electrode, and a cathode electrode on the third insulation layer, where the cathode electrode penetrates the first insulation layer, the second insulation layer and the third insulation layer, and the cathode electrode is connected to an exposed area of the source area.

## Claims

### Claim 1

An organic light emitting display device comprising:
an active layer of a transistor disposed on a substrate;
a gate electrode disposed on the active layer and on a first insulation layer;
a second insulation layer which is disposed on the gate electrode and exposes a source area and a drain area of the active layer;
a drain electrode which is disposed on the second insulation layer and is connected to an exposed area of the drain area;
a third insulation layer on the drain electrode; and
a cathode electrode on the third insulation layer,
wherein the cathode electrode penetrates the first insulation layer, the second insulation layer and the third insulation layer, and the cathode electrode is connected to an exposed area of the source area.

### Claim 2 (depends on 1)

The organic light emitting display device of claim 1, further comprising:
a source electrode between the source area and the cathode electrode.

### Claim 3 (depends on 1)

The organic light emitting display device of claim 1, further comprising:
an organic light emitting device including an anode electrode on the first insulation layer;
an organic light emitting layer on the anode electrode; and
the cathode electrode on the organic light emitting layer.

### Claim 4 (depends on 1)

The organic light emitting display device of claim 1, further comprising:
a capacitor including a lower electrode under the first insulation layer and an upper electrode on the first insulation layer, wherein the first insulation layer is a dielectric layer.

### Claim 5 (depends on 1)

The organic light emitting display device of claim 1, further comprising:
a buffer layer on the substrate.

### Claim 6 (depends on 1)

The organic light emitting display device of claim 1, further comprising:
a sealing member on the cathode electrode.

### Claim 7 (depends on 1)

The organic light emitting display device of claim 1, wherein the transistor is an initialization transistor.

### Claim 8 (depends on 7)

The organic light emitting display device of claim 7, wherein the cathode electrode applies an initialization voltage to the initialization transistor.

### Claim 9 (depends on 8)

The organic light emitting display device of claim 8, wherein the initialization voltage is a voltage applied to the cathode electrode.

### Claim 10

An organic light emitting display device comprising:
an organic light emitting device including an anode electrode, a cathode electrode, and an organic light emitting layer disposed between the anode electrode and the cathode electrode; and
a pixel circuit which supplies electric current to the organic light emitting device
and includes an initialization transistor comprising:
a substrate;
an active layer disposed on the substrate;
a first insulation layer on the active layer;
a gate electrode disposed on the first insulation layer;
a second insulation layer on the active layer;
a drain electrode connected to a drain area of the active layer exposed by a contact hole of a second insulation layer, and
a third insulation layer on the drain electrode,
wherein a source area of the initialization transistor is connected to the cathode electrode,
wherein the cathode electrode applies an initialization voltage to the initialization transistor, and
wherein the cathode electrode penetrates the first insulation layer, the second insulation layer and the third insulation layer.

### Claim 11 (depends on 10)

The organic light emitting display device of claim 10, wherein a first power voltage is applied to the anode electrode, and a second power voltage is applied to the cathode electrode,
wherein the second power voltage is the initialization voltage and is applied to the initialization transistor.

### Claim 12 (depends on 11)

The organic light emitting display device of claim 11, further comprising:
a source electrode between the source area and the cathode.

### Claim 13 (depends on 10)

The organic light emitting display device of claim 10, wherein the pixel circuit further comprises a driving transistor,
wherein a drain area of the initialization transistor is connected to a gate electrode of the driving transistor.

### Claim 14 (depends on 13)

The organic light emitting display device of claim 13, wherein a second power voltage is applied to the gate electrode of the driving transistor as a gate signal.