Touch screen integrated organic light emitting display device and method for fabricating the same

• US 8,946,690 B2
• Filed: 08/22/2012
• Issued: 02/03/2015
• Est. Priority Date: 12/07/2011
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, Jae-Do, Choi, Ho-Won
• Primary Examiner(s): HENRY, CALEB E
• Application Number:
  US13/592,207
• Publication Number:
  US 20130147727A1
• Time in Patent Office: 895 Days
• Field of Search: 345/173, 438/34, 257/E33.055, 257/40, 313/503, 313/504, 313/506, 313/512
• US Class Current: 257/40
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

Disclosed are a touch screen integrated organic light emitting display device which has a thin profile and is implemented in a flexible type and a method for fabricating the same. The touch screen integrated organic light emitting display device includes a film substrate, a first etch stopper layer and a first buffer layer sequentially formed on the film substrate, a thin film transistor array including thin film transistors formed on the first buffer layer, organic light emitting diodes connected to the thin film transistors, a passivation layer covering the thin film transistor array and the organic light emitting diodes, a touch electrode layer contacting the passivation layer, a second buffer layer and a second etch stopper layer sequentially formed on the touch electrode layer, and a polarizing plate formed on the second etch stopper layer.

Claims

1. A touch screen integrated organic light emitting display device, comprising:

a film substrate;

a first etch stopper layer and a first buffer layer sequentially formed on the film substrate;

a thin film transistor array including thin film transistors formed on the first buffer layer;

organic light emitting diodes connected to the thin film transistors;

a passivation layer covering the thin film transistor array and the organic light emitting diodes;

a touch electrode layer contacting the passivation layer;

a second buffer layer and a second etch stopper layer sequentially formed on the touch electrode layer; and

a polarizing plate formed on the second etch stopper layer.

2. The touch screen integrated organic light emitting display device according to claim 1, wherein the film substrate is formed as a plastic insulating film.

3. The touch screen integrated organic light emitting display device according to claim 1, wherein the first etch stopper layer and the second etch stopper layer are formed of polyimide or photo acryl.

4. The touch screen integrated organic light emitting display device according to claim 1, wherein the first buffer layer and the second buffer layer are formed as a plurality of layers of inorganic films.

5. The touch screen integrated organic light emitting display device according to claim 4, wherein the plurality of layers of inorganic films are formed by depositing at least one of an oxide layer and a nitride layer.

6. The touch screen integrated organic light emitting display device according to claim 1, wherein the touch electrode layer includes first touch electrodes and second touch electrodes intersecting each other and touch pad electrodes respectively transmitting signals to the first and second touch electrodes.

7. The touch screen integrated organic light emitting display device according to claim 6, wherein the touch pad electrodes are connected to dummy metal formed in the same layer as the thin film transistor array.

8. The touch screen integrated organic light emitting display device according to claim 7, wherein the touch pad electrodes and the dummy metal are connected by applying a sealant including conductive metal balls.

9. The touch screen integrated organic light emitting display device according to claim 8, wherein the conductive metal balls include gold (Au) or silver (Ag).

10. The touch screen integrated organic light emitting display device according to claim 7, wherein the first buffer layer protrudes more outwardly than the touch electrode layer.

11. The touch screen integrated organic light emitting display device according to claim 10, wherein a touch drive integrated circuit (IC) and an organic light emitting diode (OLED) IC are provided at a portion of the first buffer layer protruding more outwardly than the touch electrode layer, wherein the touch drive IC transmits and receives signals to and from the first touch electrodes and the second touch electrodes and wherein the OLED IC transmits signals to the thin film transistor array and the organic light emitting diodes.

12. The touch screen integrated organic light emitting display device according to claim 11, wherein the touch drive IC and the OLED IC are connected to a flexible printed circuit formed at the portion of the first buffer layer protruding more outwardly than the touch electrode layer.

13. The touch screen integrated organic light emitting display device according to claim 1, further comprising a transparent cover covering the polarizing plate.

14. The touch screen integrated organic light emitting display device according to claim 13, wherein the transparent cover is formed of a transparent insulating film or a glass.

15. The touch screen integrated organic light emitting display device according to claim 10, wherein:

the first buffer layer, the first etch stopper layer and the film substrate have a same first width;

the touch electrode layer, the second buffer layer and the second etch stopper layer have a same second width; and

the first width is greater than the second width.