Method for sealing flat panel displays and bonding optical component parts

• US 20030205317A1
• Filed: 05/01/2002
• Published: 11/06/2003
• Est. Priority Date: 05/01/2002
• Status: Abandoned Application

• Current Assignee: Addison Clear Wave LLC
• Original Assignee: Addison Clear Wave LLC
• Inventors: Ha, Chau Thi Minh
• Application Number:
  US10/136,704
• Publication Number:
  US 20030205317A1
• Time in Patent Office: Days
• US Class Current: 156/275.7
• CPC Class Codes: C09J 5/00 Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
• CPC Class Codes: Y10T 428/12493 Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]

Abstract

A method for assembling a flat panel display is disclosed whereby the conductive layers disposed on the inside surfaces of the two panels to be laminated are connected or laminated together with a pressure-sensitive adhesive or a latent-cure adhesive. Protective insulating layers on the conductive layers disposed on the inside surfaces of the panels have been eliminated. The adhesive connecting the opposing conductive layers serves as a suitable insulating layer. An improved flat panel display whereby the conductive layers on opposing panels is connected with either a latent-cure adhesive or a pressure-sensitive adhesive is also disclosed. Methods of laminating panels of EL displays and methods of laminating substrates of optoelectronic devices are also disclosed.

Claims

1. A method of laminating two panels of a flat panel display, the method comprising:

providing a first panel with an inner surface partially coated with a first conductive layer;

providing a second panel with an inner surface partially coated with second conductive layer;

applying adhesive directly to at least one of the first and second conductive layers;

laminating the first panel to the second panel by aligning the first and second conductive layers with the adhesive sandwiched therebetween to adhere the first conductive layer to the second conductive layer with the adhesive.

2. The method of claim 1 wherein the adhesive is a pressure sensitive adhesive.

3. The method of claim 2 wherein the pressure sensitive adhesive is curable with ultra-violet light.

4. The method of claim 2 wherein the pressure sensitive adhesive comprises:

at least one oligomer having a glass transition temperature Tg of less than or about 25°

C.;

at least one monomer;

at least one resin;

at least one adhesion promoter;

at least one photo initiator.

5. The method of claim 2 wherein the pressure sensitive adhesive comprises:

from about 5 to about 80 wt % of at least one oligomer having a glass transition temperature Tg of less than or about 25°

C.;

from about 0 to about 70 wt % of at least one monomer;

from about 5 to about 80 wt % of at least one resin;

from about 0 to about 20 wt % of at least one adhesion promoter;

from about 0 to about 10 wt % of at least one photo initiator.

6. The method of claim 2 wherein the pressure sensitive adhesive comprises:

from about 5 to about 80 wt % of at least one oligomer having a glass transition temperature Tg of less than or about 25°

C., the at least one oligomer being selected from the group consisting of aliphatic urethanes, aromatic urethanes, polyester acrylates and mixtures thereof;

from about 0 to about 70 wt % of at least one monomer selected from the group consisting of isobornyl acrylate, hexanediol diacrylate, phenoxyethyl acrylate and mixtures thereof;

from about 5 to about 80 wt % of at least one resin selected from the group consisting of thermoplastic terpene, thermoplastic polyterpene, styrene butadiene, tall oil resin and mixtures thereof;

from about 0 to about 10 wt % of at least one cross-linkable adhesion promoter selected from the group consisting of polyazamide silane, aminoalkyl silane, gamma-mercaptopropyltrimethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, gamma-methacryloxypropyltrimethoxysilane, bis-(3[triethoxysily]propyl)tetrasulfane and mixtures thereof;

from about 0 to about 10 wt % of at least one adhesion promoter selected from the group consisting of zirconium salt, titanium salt, and mixtures thereof;

from about 0 to about 10 wt % of at least one photo initiator selected from the group consisting of benzophenone, ethyl-4-(dimethylamino)benzoate, benzil dimethyl ketal and mixtures thereof.

7. The method of claim 1 wherein the adhesive comprises:

from about 40 to about 70 wt % of a urethane diacrylate oligomer;

from about 5 to about 15 wt % of ethoxy ethoxy ethyl acrylate monomer;

from about 15 to about 35 wt % of a terpene resin;

from about 1 to about 5 wt % of gamma-mercaptopropyltrimethoxysilane; and

from about 5 to about 10 wt % benzil dimethyl ketal.

8. The method of claim 1 wherein the adhesive is a latent-cure adhesive.

9. The method of claim 8 wherein the latent-cure adhesive comprises:

an epoxy oligomer;

a reactive diluent;

an adhesion promoter; and

a photo initiator.

10. The method of claim 8 wherein the latent-cure adhesive comprises:

from about 5 to about 95 wt % of at least one epoxy oligomer;

from about 0 to about 70 wt % of at least one reactive diluent;

from about 0.1 to about 10 wt % of at least one photo initiator; and

from about 0 to about 10 wt % of at least one adhesion promoter.

11. The method of claim 8 wherein the latent-cure adhesive comprises:

from about 5 to about 95 wt % of at least one epoxy oligomer selected from the group consisting of bisphenol-A epoxy, bisphenol-F epoxy and mixtures thereof;

from about 0 to about 70 wt % of at least one reactive diluent selected from the group consisting of alcohols, polyols, polyether polyols, vinyl ethers and mixtures thereof;

from about 0.1 to about 10 wt % of a photo initiator selected from the group consisting of triarylsulfonium hexafluoroantimonate salt, triarylsulfonium hexafluorophosphate salt and mixtures thereof; and

from about 0 to about 10 wt % of at least one silane functional epoxy.

12. The method of claim 11 wherein the reactive diluent is selected from the group consisting of glycol, glycol derivatives, n-propyl alcohol and lilmonene dioxide.

13. The method of claim 1 wherein the applying of the adhesive is performed by a process selected from the group consisting of screen printing, offset printing, pattern printing, syringe dispensing and precision dispensing.

14. A method of laminating two panels of a flat panel display, the method comprising:

providing a first panel with an inner surface partially coated with a first conductive layer;

providing a second panel with an inner surface partially coated with second conductive layer;

applying pressure sensitive adhesive directly to at least one of the first and second conductive layers;

laminating the first panel to the second panel by aligning the first and second conductive layers with the pressure sensitive adhesive sandwiched therebetween to adhere the first conductive layer to the second conductive layer with the pressure sensitive adhesive and without the presence of any additional insulating material disposed between the first and second conducting layers other than the pressure sensitive adhesive.

15. The method of claim 14 wherein the pressure sensitive adhesive is curable with ultra-violet light.

16. The method of claim 15 wherein the pressure sensitive adhesive comprises:

at least one oligomer having a glass transition temperature Tg of less than or about 25°

C.;

at least one monomer;

at least one resin;

at least one adhesion promoter;

at least one photo initiator.

17. The method of claim 16 wherein the pressure sensitive adhesive comprises:

from about 5 to about 80 wt % of at least one oligomer having a glass transition temperature Tg of less than or about 25°

C.;

from about 0 to about 70 wt % of at least one monomer;

from about 5 to about 80 wt % of at least one resin;

from about 0 to about 20 wt % of at least one adhesion promoter;

from about 0 to about 10 wt % of at least one photo initiator.

18. The method of claim 16 wherein the pressure sensitive adhesive comprises:

from about 5 to about 80 wt % of at least one oligomer having a glass transition temperature Tg of less than or about 25°

C., the at least one oligomer being selected from the group consisting of aliphatic urethanes, aromatic urethanes, polyester acrylates and mixtures thereof;

from about 0 to about 70 wt % of at least one monomer selected from the group consisting of isobornyl acrylate, hexanediol diacrylate, phenoxyethyl acrylate and mixtures thereof;

from about 5 to about 80 wt % of at least one resin selected from the group consisting of thermoplastic terpene, thermoplastic polyterpene, styrene butadiene, tall oil resin and mixtures thereof;

from about 0 to about 10 wt % of at least one cross-linkable adhesion promoter selected from the group consisting of polyazamide silane, aminoalkyl silane, gamma-mercaptopropyltrimethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, gamma-methacryloxypropyltrimethoxysilane, bis-(3[triethoxysily]propyl)tetrasulfane and mixtures thereof;

from about 0 to about 10 wt % of at least one adhesion promoter selected from the group consisting of zirconium salt, titanium salt, and mixtures thereof;

from about 0 to about 10 wt % of at least one photo initiator selected from the group consisting of benzophenone, ethyl-4-(dimethylamino)benzoate, benzil dimethyl ketal and mixtures thereof.

19. The method of claim 16 wherein the pressure sensitive adhesive comprises:

from about 40 to about 70 wt % of a urethane diacrylate oligomer;

from about 5 to about 15 wt % of ethoxy ethoxy ethyl acrylate monomer;

from about 15 to about 35 wt % of a terpene resin;

from about 1 to about 5 wt % of gamma-mercaptopropyltrimethoxysilane; and

from about 5 to about 10 wt % benzil dimethyl ketal.

20. A method of laminating two panels of a flat panel display, the method comprising:

providing a first panel with an inner surface partially coated with a first conductive layer;

providing a second panel with an inner surface partially coated with second conductive layer;

applying a latent-cure sensitive adhesive directly to at least one of the first and second conductive layers;

laminating the first panel to the second panel by aligning the first and second conductive layers with the latent-cure adhesive sandwiched therebetween to adhere the first conductive layer to the second conductive layer with the latent-cure adhesive and without the presence of any additional insulating material disposed between the first and second conducting layers other than the latent-cure adhesive.

21. The method of claim 20 wherein the latent-cure adhesive comprises:

an epoxy oligomer;

a reactive diluent;

an adhesion promoter; and

a photo initiator.

22. The method of claim 20 wherein the latent-cure adhesive comprises:

from about 5 to about 95 wt % of at least one epoxy oligomer;

from about 0 to about 70 wt % of at least one reactive diluent;

from about 0.1 to about 10 wt % of at least one photo initiator; and

from about 0 to about 10 wt % of at least one adhesion promoter.

23. The method of claim 20 wherein the latent-cure adhesive comprises:

from about 5 to about 95 wt % of at least one epoxy oligomer selected from the group consisting of bisphenol-A epoxy, bisphenol-F epoxy and mixtures thereof;

from about 0 to about 70 wt % of at least one reactive diluent selected from the group consisting of alcohols, polyols, polyether polyols, vinyl ethers and mixtures thereof;

from about 0.1 to about 10 wt % of a photo initiator selected from the group consisting of triarylsulfonium hexafluoroantimonate salt, triarylsulfonium hexafluorophosphate salt and mixtures thereof; and

from about 0 to about 10 wt % of at least one silane functional epoxy.

24. The method of claim 20 wherein the reactive diluent is selected from the group consisting of glycol, glycol derivatives, polyalcohols, n-propyl alcohol and limonene dioxide.

25. The method of claim 20 further comprising curing the latent-cure adhesive with ultra-violet light.

26. A flat panel display comprising:

a first panel with an inner surface partially coated with a first conductive layer, a second panel with an inner surface partially coated with second conductive layer,

the first and second conductive layers being connected with an adhesive that is sandwiched therebetween and without the presence of any additional insulating material disposed between the first and second conducting layers other than the adhesive.

27. The flat panel display of claim 26 wherein the adhesive is a pressure sensitive adhesive.

28. The flat panel display of claim 27 wherein the pressure sensitive adhesive is curable with ultra-violet light.

29. The flat panel display of claim 27 wherein the pressure sensitive adhesive comprises:

at least one oligomer having a glass transition temperature Tg of less than or about 25°

C.;

at least one monomer;

at least one resin;

at least one adhesion promoter;

at least one photo initiator.

30. The flat panel display of claim 27 wherein the pressure sensitive adhesive comprises:

from about 5 to about 80 wt % of at least one oligomer having a glass transition temperature Tg of less than or about 25°

C.;

from about 0 to about 70 wt % of at least one monomer;

from about 5 to about 80 wt % of at least one resin;

from about 0 to about 20 wt % of at least one adhesion promoter;

from about 0 to about 10 wt % of at least one photo initiator.

31. The flat panel display of claim 27 wherein the pressure sensitive adhesive comprises:

from about 5 to about 80 wt % of at least one oligomer having a glass transition temperature Tg of less than or about 25°

C., the at least one oligomer being selected from the group consisting of aliphatic urethanes, aromatic urethanes, polyester acrylates and mixtures thereof;

from about 0 to about 70 wt % of at least one monomer selected from the group consisting of isobornyl acrylate, hexanediol diacrylate, phenoxyethyl acrylate and mixtures thereof;

from about 5 to about 80 wt % of at least one resin selected from the group consisting of thermoplastic terpene, thermoplastic polyterpene, styrene butadiene, tall oil resin and mixtures thereof;

from about 0 to about 10 wt % of at least one cross-linkable adhesion promoter selected from the group consisting of polyazamide silane, aminoalkyl silane, gamma-mercaptopropyltrimethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, gamma-methacryloxypropyltrimethoxysilane, bis-(3[triethoxysily]propyl)tetrasulfane and mixtures thereof;

from about 0 to about 10 wt % of at least one adhesion promoter selected from the group consisting of zirconium salt, titanium salt, and mixtures thereof;

from about 0 to about 10 wt % of at least one photo initiator selected from the group consisting of benzophenone, ethyl-4-(dimethylamino)benzoate, benzil dimethyl ketal and mixtures thereof.

32. The flat panel display of claim 27 wherein the adhesive comprises:

from about 40 to about 70 wt % of a urethane diacrylate oligomer;

from about 5 to about 15 wt % of ethoxy ethoxy ethyl acrylate monomer;

from about 15 to about 35 wt % of a terpene resin;

from about 1 to about 5 wt % of gamma-mercaptopropyltrimethoxysilane; and

from about 5 to about 10 wt % benzil dimethyl ketal.]

33. The flat panel display of claim 26 wherein the adhesive is a latent-cure adhesive.

34. The flat panel display of claim 33 wherein the latent-cure adhesive comprises:

an epoxy oligomer;

a reactive diluent;

an adhesion promoter; and

a photo initiator.

35. The flat panel display of claim 33 wherein the latent-cure adhesive comprises:

from about 5 to about 95 wt % of at least one epoxy oligomer;

from about 0 to about 70 wt % of at least one reactive diluent;

from about 0.1 to about 10 wt % of at least one photo initiator; and

from about 0 to about 10 wt % of at least one adhesion promoter.

36. The flat panel display of claim 33 wherein the latent-cure adhesive comprises:

from about 5 to about 95 wt % of at least one epoxy oligomer selected from the group consisting of bisphenol-A epoxy, bisphenol-F epoxy and mixtures thereof;

from about 0 to about 70 wt % of at least one reactive diluent selected from the group consisting of alcohols, polyols, polyether polyols, vinyl ethers and mixtures thereof;

from about 0.1 to about 10 wt % of a photo initiator selected from the group consisting of triarylsulfonium hexafluoroantimonate salt, triarylsulfonium hexafluorophosphate salt and mixtures thereof; and

from about 0 to about 10 wt % of at least one silane functional epoxy.

37. The flat panel display of claim 36 wherein the reactive diluent is selected from the group consisting of ethylene glycol, n-propyl alcohol and limonene dioxide.

38. A method of laminating two panels of a flat panel display comprising:

providing a first panel with an inner surface;

coating the inner surface with a pressure sensitive adhesive or a latent-cure adhesive;

applying a second panel to the inner surface of the first panel with the adhesive disposed therebetween; and

curing the adhesive by exposing the first and second panels and adhesive to UV light.

39. The method of claim 38 wherein the adhesive is a pressure sensitive adhesive that comprises:

from about 5 to about 80 wt % of at least one oligomer having a glass transition temperature Tg of less than or about 25°

C., the at least one oligomer being selected from the group consisting of aliphatic urethanes, aromatic urethanes, polyester acrylates and mixtures thereof;

from about 0 to about 70 wt % of at least one monomer selected from the group consisting of isobornyl acrylate, hexanediol diacrylate, phenoxyethyl acrylate and mixtures thereof;

from about 5 to about 80 wt % of at least one resin selected from the group consisting of thermoplastic terpene, thermoplastic polyterpene, styrene butadiene, tall oil resin and mixtures thereof;

from about 0 to about 10 wt % of at least one cross-linkable adhesion promoter selected from the group consisting of polyazamide silane, aminoalkyl silane, gamma-mercaptopropyltrimethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, gamma-methacryloxypropyltrimethoxysilane, bis-(3[triethoxysily]propyl)tetrasulfane and mixtures thereof;

from about 0 to about 10 wt % of at least one adhesion promoter selected from the group consisting of zirconium salt, titanium salt, and mixtures thereof;

from about 0 to about 10 wt % of at least one photo initiator selected from the group consisting of benzophenone, ethyl-4-(dimethylamino)benzoate, benzil dimethyl ketal and mixtures thereof.

40. The method of claim 39 wherein the adhesive is a latent-cure adhesive that comprises:

from about 5 to about 95 wt % of at least one epoxy oligomer selected from the group consisting of bisphenol-A epoxy, bisphenol-F epoxy and mixtures thereof;

from about 0 to about 70 wt % of at least one reactive diluent selected from the group consisting of alcohols, polyols, polyether polyols, vinyl ethers and mixtures thereof;

from about 0.1 to about 10 wt % of a photo initiator selected from the group consisting of triarylsulfonium hexafluoroantimonate salt, triarylsulfonium hexafluorophosphate salt and mixtures thereof; and

from about 0 to about 10 wt % of at least one silane functional epoxy.

41. A method of laminating two panels of a flat panel display comprising:

providing a first panel with an inner surface;

applying adhesive to the inner surface of the first panel;

curing the adhesive by exposing the adhesive and first panel to UV light to provide a high tack adhesive coating or to initiate the latent-cure adhesive on the inner surface of the first panel;

stacking a second panel on the high tack adhesive coating disposed on the inner surface of the first panel; and

laminating the first and second panels together.

42. The method of claim 41 further comprising the following steps between the curing and the stacking of the second panel on the high tack adhesive:

applying release paper to the high tack adhesive;

storing the first panel, high tack adhesive and release paper;

removing the release paper; and

applying a second panel to the high tack adhesive.

43. The method of claim 41 wherein the adhesive is a pressure sensitive adhesive that comprises:

from about 5 to about 80 wt % of at least one oligomer having a glass transition temperature Tg of less than or about 25°

C., the at least one oligomer being selected from the group consisting of aliphatic urethanes, aromatic urethanes, polyester acrylates and mixtures thereof;

from about 0 to about 70 wt % of at least one monomer selected from the group consisting of isobornyl acrylate, hexanediol diacrylate, phenoxyethyl acrylate and mixtures thereof;

from about 5 to about 80 wt % of at least one resin selected from the group consisting of thermoplastic terpene, thermoplastic polyterpene, styrene butadiene, tall oil resin and mixtures thereof;

from about 0 to about 10 wt % of at least one cross-linkable adhesion promoter selected from the group consisting of polyazamide silane, aminoalkyl silane, gamma-mercaptopropyltrimethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, gamma-methacryloxypropyltrimethoxysilane, bis-(3[triethoxysily]propyl)tetrasulfane and mixtures thereof;

from about 0 to about 10 wt % of at least one adhesion promoter selected from the group consisting of zirconium salt, titanium salt, and mixtures thereof;

from about 0 to about 10 wt % of at least one photo initiator selected from the group consisting of benzophenone, ethyl-4-(dimethylamino)benzoate, benzil dimethyl ketal and mixtures thereof.

44. The method of claim 41 wherein the adhesive is a latent-cure adhesive that comprises:

from about 5 to about 95 wt % of at least one epoxy oligomer selected from the group consisting of bisphenol-A epoxy, bisphenol-F epoxy and mixtures thereof;

from about 0 to about 70 wt % of at least one reactive diluent selected from the group consisting of alcohols, polyols, polyether polyols, vinyl ethers and mixtures thereof;

from about 0.1 to about 10 wt % of a photo initiator selected from the group consisting of triarylsulfonium hexafluoroantimonate salt, triarylsulfonium hexafluorophosphate salt and mixtures thereof; and

from about 0 to about 10 wt % of at least one silane functional epoxy.

45. A method for bonding two substrates or an optoelectronic device together, the method comprising:

applying a pressure sensitive adhesive to at least one of the substrates;

activating the pressure sensitive adhesive with ultraviolet light; and

pressing the two substrates together with the adhesive disposed therebetween.

46. A method for bonding two substrates or an optoelectronic device together, the method comprising:

applying a latent-cure to at least one of the substrates;

activating the latent-cure with ultraviolet light; and

pressing the two substrates together with the adhesive disposed therebetween.