Illuminated membrane switch

• US 20040069607A1
• Filed: 05/01/2003
• Published: 04/15/2004
• Est. Priority Date: 08/20/1998
• Status: Abandoned Application

• Current Assignee: Screen Sign Arts Limited
• Original Assignee: Screen Sign Arts Limited
• Inventors: Hunter, Richard Stuart, Tucker, John Kenneth
• Application Number:
  US10/426,959
• Publication Number:
  US 20040069607A1
• Time in Patent Office: Days
• US Class Current: 200/512
• 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 2219/018 Electroluminescent panel

Abstract

An electroluminescent switch is described incorporating an electroluminescent lamp assembly and one or more membrane switch assembly. The rear or base electrode of the electroluminescent lamp and a conductive layer of the membrane switch are superimposed on opposite sides of the same element which functions as the means by which the membrane switch may be closed upon actuation by a user. The membrane switch can be constructed from two electrodes arranged so that the conductive layer when brought into contact with said electrodes, shorts the electrodes thereby closing the circuit. Applications for the membrane switch include electronic devices where panel switches are required or electronic devices requiring particularly thin switches which are to be backlit.

Claims

1. An electroluminescent device and membrane switch including:

one or more electroluminescent lamp assemblies and one or more membrane switch assemblies, wherein a rear flexible electrode of the electroluminescent lamp(s) and a conductive layer of the membrane switch are superimposed on opposite sides of the same element(s) which function as the means by which the membrane switch(es) is/are closed upon actuation by a user.

2. An the electroluminescent lamp/membrane switch assembly comprises:

a membrane switch including;

at least two electrodes arranged so that upon bringing a flexible conductive layer in contact with said electrodes, the electrodes are shorted;

a flexible conductive layer covering at least two of the electrodes;

a spacer interposed between the conductive layer and the at least two electrodes, the spacer being adapted to hold the conductive layer away from the at least two electrodes while allowing the conductive layer to come into contact with the at least two electrodes upon the application of pressure by a user;

an electroluminescent lamp comprising;

a rear electrode;

a substrate layer juxtaposed over the rear electrode wherein a phosphor layer and dielectric layer are interposed between the rear electrode and a substrate layer;

wherein the rear electrode of the electroluminescent lamp and the conductive layer of the membrane switch superimposed on opposite sides of the same element.

3. An electroluminescent lamp/membrane switch assembly as claimed in claim 2 wherein the at least two electrodes are in the form of a conductive array deposited on a switch substrate layer wherein the conductive array is adapted so that when the conductive layer is pressed thereupon, the at least two electrodes are shorted.

4. An electroluminescent lamp/membrane switch assembly as claimed in claim 3 wherein the at least two electrodes are in the form of an array of intermeshed tracks formed on the switching substrate.

5. An electroluminescent lamp/membrane switch assembly as claimed in claim 2 wherein the dielectric layer is superimposed over the rear electrode wherein the phosphor layer is superimposed on top of the dielectric layer and the substrate layer is superimposed upon the phosphorous layer.

6. An electroluminescent lamp/membrane switch assembly as claimed in claim 3 wherein the dielectric layer is superimposed over the rear electrode wherein the phosphor layer is superimposed on top of the dielectric layer and the substrate layer is superimposed upon the phosphorous layer.

7. An electroluminescent lamp/membrane switch assembly as claimed in claim 4 wherein the dielectric layer is superimposed over the rear electrode wherein the phosphor layer is superimposed on top of the dielectric layer and the substrate layer is superimposed upon the phosphorous layer.

8. An electroluminescent lamp/membrane switch assembly as claimed in claim 2 wherein the at least two electrodes activate devices including a driving circuit adapted to supply a current to the assembly.