Integration of organic light-emitting components into the keyboard of an electronic device

• US 6,803,903 B1
• Filed: 08/17/2000
• Issued: 10/12/2004
• Est. Priority Date: 08/17/2000
• Status: Expired due to Term

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Mobile Phones UK Limited (Nokia Corporation)
• Inventors: Kaikuranta, Terho, Svarfvar, Bror, Östergård, Toni
• Primary Examiner(s): Eisen, Alexander
• Application Number:
  US09/641,286
• Time in Patent Office: 1,517 Days
• Field of Search: 200/5.A, 200/308, 200/310-314, 345/43-46, 345/76-82, 345/168-172, 341/22, 341/23, 341/34
• US Class Current: 345/168
• 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 2219/02 programmable
• CPC Class Codes: H01H 2219/037 using organic materials, e.g. organic LED
• CPC Class Codes: H01H 2219/048 Constituting key
• CPC Class Codes: H01H 2219/053 protected by inert gas
• CPC Class Codes: H04M 1/22 Illumination; Arrangements for improving the visibility of characters on dials
• CPC Class Codes: H04M 1/23 Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof by improving visibility H04M1/22
• CPC Class Codes: H04M 1/724 User interfaces specially adapted for cordless or mobile telephones
• CPC Class Codes: H04M 1/72466 with selection means, e.g. keys, having functions defined by the mode or the status of the device
• CPC Class Codes: H04M 1/72469 for operating the device by selecting functions from two or more displayed items, e.g. menus or icons

Abstract

An integrated key and a method of producing the integrated key, wherein the integrated key can be used on an electronic device. The integrated key includes an organic light-emitting layer and a plurality of electrodes, operatively connected to a power source, to activate the light-emitting layer in order to illuminate the key. Furthermore, the light-emitting layer and the electrodes can be arranged into a group of segments or pixels. The segments or pixels can be individually addressable so that they can be selectively activated to from a symbol or words. The key is implemented on a substrate and includes an encapsulation layer to form a cavity for filling with a gaseous species to protect the organic light-emitting layer in the key.

Claims

1. An emissive key for use in a keyboard or keypad in an electronic device having a substrate, wherein the substrate has a first surface to face a user of the keyboard and an opposing second surface, and a plurality of electrical conductors disposed in a layer on the second surface of the substrate, and wherein the substrate comprises a plurality of recesses having filler layers in the recesses, said emissive key comprising:

a first electrode layer having a first side and an opposing second side, wherein the first side of the first electrode layer is provided on the second surface of the substrate in one of the recesses adjacent to the filler layer therein;

an organic light-emitting layer have a first side and an opposing second side, wherein the first side of the organic light-emitting layer is provided on the second side of the first electrode layer in said one of the recesses;

a second electrode layer having a first side and an opposing second side, wherein the first side of the second electrode layer is provided on the second side of the organic light-emitting layer; and

a gas encapsulation layer provided adjacent to the second side of the second electrode defining a cavity between the encapsulation layer and the light emitting layer for containing at least one gaseous species in order to protect the light-emitting layer, wherein the first electrode layer and the second electrode layer are electrically connected to the electrical conductor for operatively connecting the first and second electrode layers to a power source in order to activate the organic light-emitting layer.

2. The emissive key of claim 1, wherein the gaseous species is nitrogen.

3. The emissive key of claim 1, wherein the gaseous species is argon.

4. The emissive key of claim 1, wherein the first electrode layer is transparent.

5. The emissive key of claim 1, wherein the organic light-emitting layer comprises a plurality of light-emitting segments and the first and second electrode layers comprise a plurality of electrodes for selectively activating the light-emitting segments.

6. The emissive key of claim 1, wherein the organic light-emitting layer produces light when it is activated, said emissive key further comprising a masking layer provided on the substrate, wherein the masking layer has a clear area and an opaque area to form a pattern, allowing the light produced by the organic light-emitting layer to pass through the pattern.

7. The emissive key of claim 6, wherein the pattern comprises an alphanumerical symbol.

8. The emissive key of claim 5, wherein the organic light-emitting segments produce light when they are activated, said emissive key further comprising a masking layer provided on the substrate, wherein the masking layer has a clear area and an opaque area to form a pattern, allowing the light produced by the organic light-emitting segments to pass through the pattern.

9. The emissive key of claim 8, wherein the pattern comprises a plurality of symbols and the organic light-emitting segments are selectively activated in order to produce light for passing through at least one of the symbols.

10. A method of producing an emissive key for use in a keyboard of an electronic device having a substrate, wherein the substrate has a first surface to face a user of the keyboard and an opposing second surface, and a plurality of electrical conductors disposed in a layer on the second surface of the substrate, and wherein the substrate comprises a plurality of recesses having filler layers in the recesses, said method comprising the steps of:

providing a first electrode layer on the second side of the substrate in one of the recesses adjacent to the filler layer therein;

providing an organic light-emitting layer on the first electrode layer in said one of the recesses;

providing a second electrode layer on the organic light-emitting layer;

providing a gas encapsulation layer adjacent to the second electrode layer defining a cavity between the encapsulation layer and the light emitting layer; and

providing at least one gaseous species in the cavity in order to protect the organic light-emitting layer, wherein the first electrode layer and the second electrode layer are electrically connected to the electrical conductors for operatively connecting to a power source in order to activate the organic light-emitting layer.

11. The method of claim 10, further comprising the step of providing the first and second electrode layers connections to a power source in order to activate the organic light-emitting layer.

12. The method of claim 10, wherein the organic light-emitting layer comprises a plurality of light-emitting segments and the first and second electrode layers comprise a plurality of electrodes for selectively activating the light-emitting segments.

13. The method of claim 10, further comprising the step of providing a masking layer on the substrate, wherein the masking layer has a clear area and an opaque area to form a pattern, so as to allow light produced by the organic light-emitting layer, when activated, to pass through the pattern.