Method for making interactive information devices with spacer elements

• US 6,706,552 B2
• Filed: 04/11/2003
• Issued: 03/16/2004
• Est. Priority Date: 09/22/2000
• Status: Expired due to Fees

• Current Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Original Assignee: Donnelly Corporation (Magna International Incorporated)
• Inventors: Getz, Catherine A., Mennig, Martin
• Primary Examiner(s): Nelms, David
• Assistant Examiner(s): HOANG, QUOC DINH
• Application Number:
  US10/411,923
• Publication Number:
  US 20030203534A1
• Time in Patent Office: 340 Days
• Field of Search: 438/100, 257/59, 257/72
• US Class Current: 438/100
• 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 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

An interactive information device for use as a touch panel, touch screen, digitizer panel, or pen-input device, and a method for making such a device includes a first, transparent, electrically conductive layer supported by the rigid substrate, a flexible, transparent substrate at least partially aligned with the rigid substrate and having a second, transparent, electrically conductive layer on a surface thereof, the second conductive layer being spaced from the first conductive layer. A plurality of transparent insulating spacer members/dots are positioned on one or both of the conductive layers to allow the conductive layers to engage when the flexible substrate is pressed. The spacer members/dots comprise polymeric material including at least some inorganic material, and more preferably, comprise organic-inorganic nanocomposites having an index of refraction optically matched to the transparent, electrically conductive layer on which they are positioned.

Claims

1. A method for making an interactive information device comprising:

providing a rigid, transparent substrate;

providing a first transparent, electrically conductive layer supported by a surface of said rigid substrate;

providing a first flexible, transparent substrate having a second transparent electrically conductive layer on a surface thereof;

forming a plurality of insulating spacer members by depositing portions of a material comprising polymeric material and at least some inorganic material at spaced locations on at least one of said first and second electrically conductive layer; and

securing said first flexible substrate to said rigid substrate such that said first and second electrically conductive layers on said respective substrates are at least partially aligned with one another and spaced from one another by a gap in which said spacer members are positioned whereby said flexible substrate may be flexed by pressing to engage said conductive layers.

2. The method of claim 1 including deleting portions of at least one of said first and second electrically conductive layers to provide a touch screen pattern.

3. The method of claim 1 including forming said spacer members by silk screening said material on at least said one electrically conductive layer, and curing said formed spacer members after silk screening.

4. The method of claim 3 including forming said spacer members by silk screening said material on both of said first and second electrically conductive layers, and curing said formed spacer members.

5. The method of claim 3 wherein said curing includes subjecting said spacer members to ultraviolet light.

6. The method of claim 3 wherein said curing includes drying said spacer members at less than about 300 degrees C. for less than about 40 minutes.

7. The method of claim 1 wherein said forming includes substantially matching the index of refraction of said spacer members to the index of refraction of said one transparent, electrically conductive layer.

8. The method of claim 1 wherein said forming of said spacer members includes incorporating nanoscale particles as said inorganic material.

9. The method of claim 8 wherein said forming of said spacer members includes incorporating nano-particle metal oxides as said nanoscale particles.

10. The method of claim 8 wherein said forming of said spacer members includes incorporating a pigment as said nanoscale particles.

11. The method of claim 1 including forming said spacer members to include at least one of a compound for surface modification of said inorganic material, and a cross-linking initiator.

12. The method of claim 1 including forming said spacer members from an organic-inorganic nano-composites.

13. The method of claim 1 wherein said forming includes preparing a paste of said material and silk screening said spacer members onto said one electrically conductive layer from said paste.

14. The method of claim 13 including silk screening said spacer members with a mesh screen such that at least one of said spacer members has a width dimension of at least about 15 microns.

15. The method of claim 14 including silk screening said spacer members with a mesh screen such that at least one of said spacer members has a height dimension of at least about 3 microns.

16. The method of claim 14 including silk screening said spacer members with a mesh screen such that at least one of said spacer members has a height dimension of about 3 microns to about 25 microns.

17. The method of claim 13 including silk screening said spacer members with a mesh screen such that at least one of said spacer members has a width dimension of about 15 microns to about 125 microns.

18. The method of claim 13 including silk screening said spacer members with a mesh screen such that at least one of said spacer members has a height dimension of at least about 3 microns.

19. The method of claim 13 including silk screening said spacer members with a mesh screen such that at least one of said spacer members has a height dimension of about 3 microns to about 25 microns.