Organic light emitting diode display device with touch screen and method of fabricating the same

• US 9,501,165 B2
• Filed: 12/23/2014
• Issued: 11/22/2016
• Est. Priority Date: 12/26/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Hyoung-Su, Lee, Bu-Yeol
• Primary Examiner(s): Wang, Quan-Zhen
• Assistant Examiner(s): Zheng, Xuemei
• Application Number:
  US14/582,057
• Publication Number:
  US 20150185942A1
• Time in Patent Office: 700 Days
• US Class Current: 1/1
• 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: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens

Abstract

An OLED display device with a touch screen includes first and second substrates; organic light emitting diodes in the display area over the first substrate; first pads and second pads in the non-display area over the first substrate; first and second touch electrodes in the display area over the second substrate; touch pads in the non-display area over the second substrate and corresponding to and overlapping the second pads, respectively; and a first adhesive layer between the first and second substrates and exposing the first and second pads, wherein pad contact holes pass through the second substrate, the touch pads, and the first adhesive layer and expose the second pads, respectively, and wherein a conduction means is disposed in each of the pad contact holes and electrically connects each of the touch pads with a corresponding second pad.

Claims

1. An organic light emitting diode display device with a touch screen, comprising:

first and second substrates where a display area including pixel regions and a non-display area at an outside of the display area are defined;

organic light emitting diodes in the display area over the first substrate;

first pads and second pads in the non-display area over the first substrate;

first and second touch electrodes in the display area over the second substrate;

touch pads in the non-display area over the second substrate and corresponding to and overlapping the second pads, respectively; and

a first adhesive layer between the first and second substrates and exposing the first and second pads,

wherein pad contact holes pass through the second substrate, the touch pads, and the first adhesive layer and expose the second pads, respectively, and

wherein a conduction means is disposed in each of the pad contact holes and electrically connects each of the touch pads with a corresponding second pad.

2. The display device of claim 1, wherein the touch screen comprises the second substrate and the first and second touch electrodes.

3. The display device of claim 1, wherein a flexible printed circuit board connector is mounted to the first substrate in the non-display area and contacts the first and second pads.

4. The display device of claim 1, wherein the pad contact holes pass through the second pads.

5. The display device of claim 1, wherein the first touch electrodes cross the second touch electrodes.

6. The display device of claim 5, wherein the first touch electrodes are disposed over a first surface of the second substrate, and the second touch electrodes are disposed over a second surface of the second substrate.

7. The display device of claim 5, wherein the first touch electrodes and the second touch electrodes are disposed over a surface of the second substrate with an insulating layer interposed between the first touch electrodes and the second touch electrodes.

8. The display device of claim 1,

wherein the touch pads include first touch pads connected to the first touch electrodes and second touch pads connected to the second touch electrodes, and

wherein the first and second touch pads have a single-layered structure of a same material as the first and second touch electrodes or a double-layered structure including a lower layer of a same material as the first and second touch electrodes and an upper layer of a metallic material.

9. The display device of claim 1, further comprising an encapsulation layer having a multiple-layered structure or an encapsulation film on the organic light emitting diodes.

10. The display device of claim 1, further comprising a polarizing film or a cover glass at an outer surface of the second substrate with a second adhesive layer between the second substrate and the polarizing film or the cover glass.

11. The display device of claim 1, further comprising a color filter layer including red, green, and blue color filter patterns on an inner surface of the second substrate in the display area,

wherein the red, green, and blue color filter patterns are sequentially and repeatedly disposed in the pixel regions, respectively, and the organic light emitting diodes emit white light.

12. The display device of claim 11, wherein the first and second touch electrodes are disposed over the color filter layer such that the color filter layer is interposed between the second substrate and the first and second touch electrodes.

13. The display device of claim 1, further comprising gate lines, data lines, and power supply lines in the display area over the first substrate, wherein the gate lines and the data lines cross each other to define the pixel regions, and the power supply lines are parallel to the gate lines or the data lines, and wherein the first pads are connected to the gate lines, the data lines, and the power supply lines, respectively.

14. The display device of claim 13, further comprising switching thin film transistors and driving thin film transistors in the pixel regions over the first substrate,

wherein the switching thin film transistors are connected to the gate lines and the data lines, and the driving thin film transistors are connected to the power supply lines, the switching thin film transistors, and the organic light emitting diodes.

15. A method of fabricating an organic light emitting diode display device with a touch screen, the method comprising:

forming organic light emitting diodes in a display area over a first substrate, the display area including pixel regions;

forming first pads and second pads in a non-display area over the first substrate, the non-display area disposed at an outside of the display area;

forming first and second touch electrodes in the display area and touch pads in the non-display area over a second substrate, the first and second touch electrodes crossing each other, and the touch pads connected to the first and second touch electrodes and corresponding to and overlapping the second pads, respectively;

attaching the first substrate and the second substrate with a first adhesive layer interposed therebetween, the first adhesive layer exposing the first and second pads;

forming pad contact holes by irradiating with a laser beam, the pad contact holes passing through the second substrate, the touch pads, and the first adhesive layer and exposing the second pads, respectively; and

forming a conduction means by applying and curing a metal paste in each of the pad contact holes, the conduction means electrically connecting each of the touch pads with a corresponding second pad.

16. The method of claim 15, further comprising a step of mounting a flexible printed circuit board connector to the first substrate in the non-display area, the flexible printed circuit board connector contacting the first and second pads.

17. The method of claim 15, wherein the pad contact holes pass through the second pads, and the conduction means contacts a side surface of one of the touch pads and a side surface of one of the second pads.

18. The method of claim 15, wherein the first touch electrodes are formed over a first surface of the second substrate, and the second touch electrodes are formed over a second surface of the second substrate.

19. The method of claim 15, wherein the first touch electrodes and the second touch electrodes are formed over a surface of the second substrate with an insulating layer interposed between the first touch electrodes and the second touch electrodes.

20. The method of claim 15, further comprising forming a color filter layer including red, green, and blue color filter patterns in the display area over the second substrate,

wherein the red, green, and blue color filter patterns are sequentially and repeatedly disposed in the pixel regions, respectively, and the organic light emitting diodes emit white light.

21. The method of claim 20, wherein the first and second touch electrodes are formed after forming the color filter layer.

22. The method of claim 15, further comprising:

forming gate lines, data lines, and power supply lines in the display area over the first substrate, wherein the gate lines and the data lines cross each other to define the pixel regions, and the power supply lines are parallel to the gate lines or the data lines, and wherein the first pads are connected to the gate lines, the data lines, and the power supply lines, respectively; and

forming switching thin film transistors and driving thin film transistors in the pixel regions,

wherein the switching thin film transistors are connected to the gate lines and the data lines, and the driving thin film transistors are connected to the power supply lines, the switching thin film transistors, and the organic light emitting diodes.