TOUCH-SENSITIVE DISPLAY DEVICE AND FABRICATION METHOD THEREFOR

• US 20130293499A1
• Filed: 05/06/2013
• Published: 11/07/2013
• Est. Priority Date: 05/07/2012
• Status: Active Grant

• Current Assignee: Wintek Corporation
• Original Assignee: Wintek Corporation
• Inventors: CHANG, TING-YU, KANG, HEN-TA, HSU, CHING-FU, LIAO, HSIAO-HUI
• Granted Patent: US 9,507,449 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

A touch-sensitive display device includes a substrate, an OLED structure and a cover plate. The OLED structure is disposed on the substrate and includes a first electrode layer, a light-emitting layer and a second electrode layer. The first electrode layer is disposed on the substrate, the light-emitting layer is disposed on the first electrode layer, and the second electrode layer is disposed on the light-emitting layer and patterned to form a plurality of touch-sensing electrodes. The cover plate is disposed opposite the substrate and spaced at an interval from the substrate, and the OLED structure is sealed between the substrate and the cover plate.

Claims

1. A touch-sensitive display device, comprising:

a substrate;

an OLED structure disposed on the substrate, wherein the OLED structure comprises;

a first electrode layer disposed on the substrate;

a light-emitting layer disposed on the first electrode layer; and

a second electrode layer disposed on the light-emitting layer and patterned to form a plurality of touch-sensing electrodes; and

a cover plate disposed opposite the substrate and spaced at an interval from the substrate, and the OLED structure being sealed between the substrate and the cover plate.

2. The touch-sensitive display device as claimed in claim 1, wherein the first electrode layer is an anode layer, and the second electrode layer is a cathode layer.

3. The touch-sensitive display device as claimed in claim 1, wherein the touch-sensitive display device comprises a plurality of pixels, and a distribution area of each of the touch-sensing electrodes covers multiple pixels.

4. The touch-sensitive display device as claimed in claim 1, further comprising:

a plurality of partitioning structures for partitioning the second electrode layer to form the touch-sensing electrodes.

5. The touch-sensitive display device as claimed in claim 4, wherein the touch-sensitive display device comprises a plurality of pixels, and each of the partitioning structures is disposed in a gap between adjacent pixels.

6. The touch-sensitive display device as claimed in claim 1, wherein each of the touch-sensing electrodes is in the shape of a polygon.

7. The touch-sensitive display device as claimed in claim 1, wherein the substrate is an active matrix TFT substrate.

8. The touch-sensitive display device as claimed in claim 1, further comprising:

a cover lens stacked on the cover plate; and

a decoration layer disposed on a periphery of the cover lens.

9. The touch-sensitive display device as claimed in claim 8, wherein the decoration layer comprises at least one of diamond like carbon, ceramic, colored ink, resin and photo resist.

10. The touch-sensitive display device as claimed in claim 8, wherein the cover lens is made of glass or plastic.

11. The touch-sensitive display device as claimed in claim 1, wherein each frame time is divided into a display period and a touch-sensing period, and at least one touch-sensing signal drives the touch-sensing electrodes only in the touch-sensing period.

12. The touch-sensitive display device as claimed in claim 11, wherein the touch-sensitive display device comprises a plurality of pixels, each pixel comprises a first switch, a second switch, a third switch and a fourth switch, one end of the OLED structure is connected to the first switch and the second switch in parallel, another end of the OLED structure is connected to the third switch and the fourth switch in parallel, the fourth switch is electrically connected to a touch-sensing signal, the first switch and the third switch are turned on and the second switch and the fourth switch are turned off during the display period, and the first switch and the third switch are turned off and the second switch and the fourth switch are turned on during the touch-sensing period.

13. The touch-sensitive display device as claimed in claim 12, wherein each of the first switch, the second switch, the third switch and the fourth switch is a thin film transistor.

14. The touch-sensitive display device as claimed in claim 11, wherein the second electrode layer is in a low voltage level and the first electrode layer is in a high voltage level during the display period, and the second electrode layer is in a high voltage level and the first electrode layer in a low voltage level during the touch-sensing period.

15. A fabrication method for a ouch-sensitive display device, comprising the steps of:

providing a substrate;

forming a first electrode layer and a light-emitting layer on the substrate;

disposing multiple partitioning structures on the light-emitting layer; and

forming a second electrode layer on the light-emitting layer, wherein a height difference is formed between a part of the second electrode layer on the partitioning structures and another part of the second electrode layer not on the partitioning structures to partition the second electrode layer to form multiple disconnected segments.

16. The fabrication method as claimed in claim 15, wherein the first electrode layer is an anode layer, and the second electrode layer is a cathode layer.

17. The fabrication method as claimed in claim 15, wherein the touch-sensitive display device comprises a plurality of pixels, and each of the partitioning structures is disposed in a gap between adjacent pixels.