Optical Level Composite Pressure-Sensitive Adhesive and an Apparatus Therewith

• US 20120113361A1
• Filed: 11/10/2010
• Published: 05/10/2012
• Est. Priority Date: 11/10/2010
• Status: Abandoned Application

• Current Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Original Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Inventors: Huang, Jun-Yao, Hung, Po-Pin
• Application Number:
  US12/943,009
• Publication Number:
  US 20120113361A1
• Time in Patent Office: Days
• US Class Current: 349/96
• CPC Class Codes: C09J 2203/318 for the production of liquid crystal displays
• CPC Class Codes: C09J 2301/208 the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/041 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: Y10T 428/24959 of adhesive layers
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/3162 Cross-linked polyester [e.g., glycerol maleate-styrene, etc.]
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31794 Of cross-linked polyester

Abstract

The present invention is directed to an optical level composite pressure-sensitive adhesive (PSA), which includes a first portion and a second portion, which have different crosslinked densities and together form a mono-composite structure. The first portion and the second portion may be respectively bonded to a first lamination layer and a second lamination layer that are heterogeneous to each other. Accordingly, different interfacial adhesion and bulk rheology are generated at the interface of the first portion/first, lamination layer and the interface of the second portion/second lamination layer.

Claims

1. An optical level composite pressure-sensitive adhesive (PSA), comprising:

a first portion; and

a second portion having a crosslinked density less than a crosslinked density of the first portion, wherein the first portion and the second portion together form a mono-composite structure;

wherein the first portion and the second portion may be bonded to a first lamination layer and a second lamination layer respectively that are heterogeneous to each other.

2. The PSA of claim 1, wherein the first portion has a modulus greater than a modulus of the second portion.

3. The PSA of claim 2, wherein a storage modulus of the first portion is 2×

10⁵−

9×

10⁵, and a storage modulus of the second portion is 2×

10⁴−

9×

10⁴, under modulus detection in a dynamic mechanical analysis (DMA) at 80-85°

C.

4. The PSA of claim 2, wherein a storage modulus of the first portion is greater than 2×

10⁵, and the storage modulus of the second portion is less than 9×

10⁴.

5. The PSA of claim 1, wherein molecular weight of the first portion is greater than molecular weight of the second portion.

6. The PSA of claim 5, wherein the molecular weight of the first portion is above 60000, and the molecular weight of the second portion is below 30000.

7. The PSA of claim 1, wherein a glass transition temperature (Tg) of the first portion is higher than a glass transition temperature of the second portion.

8. The PSA of claim 1, wherein the first portion has a thickness smaller than a thickness of the second portion.

9. The PSA of claim 8, wherein the first portion has the thickness of about 10-25 μ

m, and the second portion has the thickness of about 100-500 μ

m.

10. The PSA of claim 1, wherein the first portion and the second portion are made of material of acrylic-based PSA, rubber-based PSA or silicon-based PSA.

11. The PSA of claim 1, wherein the first lamination layer is a non-glass layer, and the second lamination layer is a glass layer.

12. The PSA of claim 11, wherein the first lamination is a plastic-based layer, and the second lamination layer is a glass layer.

13. An apparatus with an optical level composite pressure sensitive adhesive, the apparatus being adapted as a touch apparatus, comprising:

a touch substrate;

a cover lens disposed above the touch substrate; and

a composite pressure-sensitive adhesive (PSA) bonded between the cover lens and the touch substrate;

wherein the composite PSA includes a first portion and a second portion that together form a mono-composite structure, and the first portion has a crosslinked density greater than a crosslinked density of the second portion.

14. The apparatus with the optical level composite pressure-sensitive adhesive of claim 13, wherein one of the cover lens and the touch substrate is a glass layer and the other is a plastic-based layer, wherein the first portion of the composite PSA is bonded to the plastic-based layer, and the second portion of the composite PSA is bonded to the glass layer.

15. The apparatus with the optical level, composite pressure-sensitive adhesive of claim 13, further comprising an ink layer disposed on a surface of the cover lens facing the touch substrate.

16. An apparatus with an optical level composite pressure-sensitive adhesive, the apparatus being adapted as a display apparatus, comprising:

at least one polarizer;

a display module including at least one glass layer and a cell layer; and

at least one composite pressure-sensitive adhesive (PSA) bonded between the polarizer and the display module;

wherein the composite PSA includes a first portion and a second portion that together form a mono-composite structure, and the first portion has a crosslinked density greater than a crosslinked density of the second portion; and

wherein the first portion is bonded to the polarizer and the second portion is bonded to the display module.

17. The apparatus with the optical level composite pressure-sensitive adhesive of claim 16 is a liquid crystal display (LCD), an organic light-emitting diode (OLED) display or an electroluminescent (EL) display.

18. The apparatus with the optical level composite pressure-sensitive adhesive of claim 16, wherein the at least one polarizer comprises a first polarizer and a second polarizer.

19. The apparatus with the optical level composite pressure-sensitive adhesive of claim 18, wherein the at least one glass layer comprises a first glass layer and a second glass layer, wherein the first glass layer is adjacent to the first polarizer, the second glass layer is adjacent to the second polarizer, and the cell layer is disposed between the first glass layer and the second glass layer.

20. The apparatus with the optical level composite pressure-sensitive adhesive of claim 19, further comprising a cover lens and another PSA, wherein the first polarizer is disposed between the first glass layer and the cover lens, and said another PSA, is bonded between the first polarizer and the cover lens.

21. The apparatus with the optical level, composite pressure-sensitive adhesive of claim 19, further comprising an optical compensation layer, wherein the cover lens is disposed between the first polarizer and the optical compensation layer.

22. The apparatus with the optical level, composite pressure-sensitive adhesive of claim 16, further comprising:

a cover lens; and

a touch layer disposed on a surface of the cover lens that faces the polarizer, thereby forming a touch-on-lens display apparatus.

23. The apparatus with the optical level composite pressure-sensitive adhesive of claim 16, further comprising a touch layer disposed on a surface of the display module that faces the polarizer, thereby forming an on-cell display apparatus.

24. The apparatus with the optical level composite pressure-sensitive adhesive of claim 16, further comprising a touch layer disposed in the display module, thereby forming an in-cell display apparatus.

25. An apparatus with an optical level composite pressure-sensitive adhesive, the apparatus being adapted as a touch-display screen, comprising:

a touch apparatus;

a display apparatus; and

a composite pressure-sensitive adhesive (PSA) bonded between the touch apparatus and the display apparatus;

wherein the composite PSA includes a first portion and a second portion that together form a mono-composite structure, and the first portion has a crosslinked density different from a crosslinked density of the second portion.

26. The apparatus with the optical level composite pressure-sensitive adhesive of claim 25, wherein the touch apparatus comprises:

a cover lens; and

a touch substrate disposed below the cover lens and above the display apparatus.

27. The apparatus with the optical level composite pressure-sensitive adhesive of claim 25, wherein the display apparatus comprises:

a first polarizer;

a second polarizer;

a first glass layer;

a cell layer; and

a second glass layer, wherein the first glass layer is adjacent to the first polarizer, the second glass layer is adjacent to the second polarizer, and the cell layer is disposed between the first glass layer and the second glass layer.