Touch activated electroluminescent lamp and display switch

• US 5,680,160 A
• Filed: 02/09/1995
• Issued: 10/21/1997
• Est. Priority Date: 02/09/1995
• Status: Expired due to Term

• Current Assignee: Technomark, Inc.
• Original Assignee: Leading Edge Industries, Inc.
• Inventors: LaPointe, Bradley J.
• Primary Examiner(s): GARBER, WENDY RAE
• Application Number:
  US08/388,061
• Time in Patent Office: 985 Days
• Field of Search: 345/76, 345/80, 345/173, 345/174, 313/508, 313/502, 313/501, 313/498, 313/506, 313/509, 315/169.3
• US Class Current: 345/173
• CPC Class Codes: H01H 13/702 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
• CPC Class Codes: H01H 13/703 characterised by spacers between contact carrying layers
• CPC Class Codes: H01H 13/807 characterised by the spatial arrangement of the contact sites, e.g. superimposed sites
• CPC Class Codes: H01H 2211/01 Ink
• CPC Class Codes: H01H 2219/018 Electroluminescent panel
• CPC Class Codes: H01H 2219/046 above switch site
• CPC Class Codes: H01H 2225/002 superimposed
• CPC Class Codes: H01H 2225/018 Consecutive operations
• CPC Class Codes: H01H 2229/002 Screen printing
• CPC Class Codes: H01H 2229/038 Folding of flexible printed circuit
• CPC Class Codes: H01H 2239/03 Avoiding erroneous switching

Abstract

The present invention is for touch activated electroluminescent lamps and displays having a flexible translucent or transparent substrate, a transparent electrode deposited onto the flexible transparent substrate, a phosphor layer over the transparent electrode, a dielectric layer over the phosphor layer, and a second electrode, which together form a lamp. A third electrode is separated from the second electrode by an insulating spacer having an open region configured to allow contact between the second electrode and the third electrode when pressure is applied to the flexible transparent substrate. For a touch activated display, a segmented second electrode is employed to allow selectively energizing regions of the display. In a two-staged embodiment, a fourth electrode is separated from the third electrode by an insulating sheet, and a fifth electrode is separated from the fourth electrode by a second insulating spacer which has a second open region therein, which is configured to allow contact between the fourth electrode and the fifth electrode when additional pressure is applied to the flexible transparent substrate.

Claims

1. A touch activated electroluminescent lamp comprising:

a flexible transparent substrate;

a transparent first electrode deposited onto said transparent substrate;

a phosphor layer overlaying said transparent first electrode;

a dielectric layer overlaying said phosphor layer;

a second electrode overlaying said dielectric layer;

a third electrode spaced apart from said second electrode; and

an insulating spacer having an open region, said insulating spacer interposed between said second electrode and said third electrode, said open region being configured to allow contact between said second electrode and said third electrode when pressure is applied to said flexible transparent substrate,

said transparent first electrode and said second electrode serving to energize said phosphor layer when said second electrode contacts said third electrode.

2. The touch activated electroluminescent lamp of claim 1 wherein said insulating spacer has a frame bounding said open region and isolated insulating bodies affixed with respect to said frame and distributed therein.

3. The touch activated electroluminescent lamp of claim 2 wherein said isolated insulating bodies are affixed to said third electrode and contoured so as to provide smooth contact between said insulating bodies and said second electrode when said second electrode is in contact with said third electrode.

4. The touch activated electroluminescent lamp of claim 3 wherein said isolated insulating bodies are hemi-spherical caps uniformly distributed in an array, said isolated insulating bodies being arranged in a first set of parallel rows and a second set of parallel rows.

5. The touch activated electroluminescent lamp of claim 4 wherein said first set of parallel rows are orthogonal with respect to said second set of parallel rows.

10. The touch activated electroluminescent lamp of claim 3 further comprising;

a flexible film having a front region, a hinge region, and a back region;

wherein said transparent first electrode, said phosphor layer, said dielectric layer, and said second electrode are deposited onto said front region of said flexible film, said front region of said flexible film providing said transparent substrate; and

wherein said third electrode and said insulating spacer with said isolated insulating bodies are deposited onto said back region of said flexible film; and

said hinge region allowing folding of said front region with respect to said back region so that said second electrode is substantially parallel to said third electrode and is brought into registry with said insulated spacer.

11. The touch activated electroluminescent lamp of claim 1 further comprising:

a fourth electrode;

an insulating sheet separating said fourth electrode from said third electrode;

a fifth electrode; and

a second insulating spacer separating said fifth electrode from said fourth electrode, said second insulating spacer having a second open region therein which is configured to allow contact between said fourth electrode and said fifth electrode when additional pressure is applied to said flexible transparent substrate.

12. The touch activated electroluminescent lamp of claim 3 wherein said isolated insulating bodies are ridges.

6. A touch activated electroluminescent display comprising:

a flexible transparent substrate;

a transparent first electrode deposited onto said transparent substrate;

a phosphor layer overlaying said transparent first electrode;

a dielectric layer overlaying said phosphor layer;

a second electrode which is segmented, said segmented second electrode overlaying said dielectric layer, said segmented second electrode having at least a first electrode segment bounded by a first peripheral edge and a second electrode segment bounded by a second peripheral edge;

a third electrode spaced apart from said segmented second electrode; and

an insulating spacer having an open region, said insulating spacer being interposed between said segmented second electrode and said third electrode and being configured to

allow contact between said segmented second electrode and said third electrode when pressure is applied to said flexible transparent substrate,

said transparent first electrode and said segmented second electrode serving to energize said phosphor layer when said second electrode contacts said third electrode.

7. The touch activated electroluminescent display of claim 6 wherein said insulating spacer further comprises:

a frame bounding said open region;

an array of isolated insulating bodies distributed within said frame and attached to said third electrode; and

ridges residing within said frame and attached to said third electrode, said ridges aligning with said peripheral edge for each of said first and second electrode segments.

8. The touch activated electroluminescent display of claim 7 wherein said isolated insulating bodies are arranged in a first set of parallel rows and a second set of parallel rows.

9. The touch activated electroluminescent display of claim 8 wherein said first set of parallel rows is orthogonal to said second set of parallel rows.

13. The touch activated electroluminescent display of claim 7 wherein said phosphor layer is a segmented phosphor layer, said segmented phosphor layer having at least a first phosphor segment which is coincident with said first electrode segment and a second phosphor segment which is coincident with said second electrode segment.