Organic light emitting display device and method for fabricating the same

• US 8,895,971 B2
• Filed: 12/20/2012
• Issued: 11/25/2014
• Est. Priority Date: 08/22/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Eun-Ah, Lee, Joon-Suk
• Primary Examiner(s): Doan, Theresa T
• Application Number:
  US13/721,319
• Publication Number:
  US 20140054555A1
• Time in Patent Office: 705 Days
• Field of Search: 257/40, 257/79, 438/22, 438/82
• US Class Current: 257/40
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/875 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

The organic light emitting display device includes a substrate, a thin film transistor formed on the substrate, a protective film formed to cover the thin film transistor, a color filter layer formed on the substrate exposed by removing a gate insulating layer of the thin film transistor and the protective film, an overcoat layer formed over the entire surface of the substrate to cover the color filter layer and the protective film, a drain contact hole exposing the thin film transistor by selectively removing the protective film and the overcoat layer, and a first electrode connected to the thin film transistor through the drain contact hole on the overcoat layer, a white organic light emitting layer formed on the first electrode, and a second electrode formed to cover the white organic light emitting layer.

Claims

1. An organic light emitting display device comprising:

a substrate;

a thin film transistor formed on the substrate;

a protective film formed to cover the thin film transistor;

a color filter layer formed on the substrate corresponding to a portion of a display region and exposed by removing a gate insulating layer of the thin film transistor and the protective film;

an overcoat layer formed over the entire surface of the substrate to cover the color filter layer and the protective film;

a drain contact hole exposing the thin film transistor by selectively removing the protective film and the overcoat layer;

a first electrode connected to the thin film transistor through the drain contact hole on the overcoat layer;

a white organic light emitting layer formed on the first electrode; and

a second electrode formed to cover the white organic light emitting layer.

2. The organic light emitting display device of claim 1, wherein white light emitted by the white organic light emitting layer is discharged to the outside sequentially through the overcoat layer, the color filter layer, and the substrate.

3. The organic light emitting display device of claim 1, wherein the color filter layer and the overcoat layer have the same index of refraction.

4. The organic light emitting display device of claim 1, wherein the indexes of refraction of the gate insulating layer and the protective film are greater than indexes of refraction of the substrate and the color filter layer.

5. The organic light emitting display device of claim 1, wherein one edge of the protective film formed in the display region of the substrate is disposed at the same position of one edge of the gate insulating layer.

6. The organic light emitting display device of claim 1, wherein the gate insulating layer and the protective film are formed of the same material.