Method of manufacturing electroluminescent lamps having surface designs and lamps produced thereby

• US 5,620,348 A
• Filed: 05/12/1995
• Issued: 04/15/1997
• Est. Priority Date: 05/12/1995
• Status: Expired due to Term

• Current Assignee: Timex Corporation (Tanager Group BV)
• Original Assignee: Timex Corporation (Tanager Group BV)
• Inventors: Dixon, John, Ledesma, Andrew C., Santana, Jose, Thorgersen, Harold
• Primary Examiner(s): Ramsey, Kenneth J.
• Assistant Examiner(s): Knapp, Jeffrey T.
• Application Number:
  US08/439,840
• Time in Patent Office: 704 Days
• Field of Search: 445/24, 427/66, 313/506, 313/111, 313/110, 362/84
• US Class Current: 445/24
• CPC Class Codes: H05B 33/02 Details
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources

Abstract

The method and structure for providing surface designs to electroluminescent (EL) lamps involves two essential steps. First, a layer of transflective material is introduced to the EL lamp comprising a transparent substrate and front and back electrodes sandwiching an electroluminescent layer and an insulating layer. The layer of transflective material reflects incident ambient light and transmits light emitted by an energized electroluminescent layer. In the preferred embodiment of the invention, the layer of transflective material replaces the front electrode of the EL lamp. Second, a predetermined surface design is provided to the transparent substrate to enhance diffusion and fringing of both the reflected incident ambient light and the light emitted by the energized electroluminescent layer. This enhanced diffusion and fringing leads to a visually appealing appearance.

Claims

1. An improved method of manufacturing an electroluminescent lamp having a front side and a back side of the type having a transparent substrate with top and bottom surfaces, and front and back electrodes having interposed therebetween an electroluminescent layer and an insulating layer, wherein the improvement comprises:

adapting the front side of said lamp to reflect incident ambient light and transmit light received from the electroluminescent layer when the electroluminescent layer is energized; and

providing the transparent substrate with a predetermined surface configuration on one surface to enhance the diffusion and fringing of the reflected incident ambient light and the light emitted by the electroluminescent layer when energized.

2. An improved method of manufacturing an electroluminescent lamp of the type having a transparent substrate with top and bottom surfaces, and front and back electrodes having interposed therebetween an electroluminescent layer and an insulating layer, wherein the improvement comprises:

adapting the front electrode to reflect incident ambient light and transmit light received from the electroluminescent layer when the electroluminescent layer is energized; and

providing the transparent substrate with a predetermined surface configuration on one surface to enhance the diffusion and fringing of the reflected incident ambient light and the light emitted by the electroluminescent layer when energized.

3. The method according to claim 2, which further comprises the step of applying lacquer to the top surface of the transparent substrate.

4. The method according to claim 2, which further comprises the step of providing indicia on the top surface of the transparent substrate.

5. The method according to claim 2, wherein the step of providing the predetermined surface configuration comprises scratching the top surface of the transparent substrate with an abrasive instrument.

6. The method according to claim 5, wherein the abrasive instrument is a metallic brush.

7. The method according to claim 2, wherein the step of adapting the front electrode comprises forming the front electrode out of a layer of aluminum.

8. The method according to claim 7, wherein the layer of aluminum is 500 to 1000 angstroms in thickness.

9. A method for manufacturing an electroluminescent lamp of the type having a transparent substrate with top and bottom surfaces, and front and back electrodes having interposed therebetween an electroluminescent layer and an insulating layer, wherein the improvement comprises:

interposing a layer of transflective material between the front electrode and the electroluminescent layer, the layer of transflective material being adapted to reflect incident ambient light and transmit light received from the electroluminescent layer when the electroluminescent layer is energized; and

providing the transparent substrate with a predetermined surface configuration on one surface to enhance the diffusion and fringing of the reflected incident ambient light and the light emitted by the electroluminescent layer when energized.

10. The method according to claim 9, which further comprises the step of applying lacquer to the top surface of the transparent substrate.

11. The method according to claim 9, which further comprises the step of providing indicia on the top surface of the transparent substrate.

12. The method according to claim 9, wherein the step of providing the predetermined surface configuration comprises scratching the top surface of the transparent substrate with an abrasive instrument.

13. The method according to claim 12, wherein the abrasive instrument is a metallic brush.

14. The method according to claim 9, wherein the transflective material comprises aluminum.

15. The method according to claim 14, wherein the layer of transflective material has thickness on the order of 500 angstroms.

16. An improved method of manufacturing an electroluminescent lamp of the type having a first transparent substrate with top and bottom surfaces, and front and back electrodes having interposed therebetween an electroluminescent layer and an insulating layer, wherein the improvement comprises:

providing a layer of transflective material having top and bottom surfaces to the top surface of the first transparent substrate, the layer of transflective material being adapted to reflect incident ambient light and transmit light received from the electroluminescent layer when the electroluminescent layer is energized;

providing a second transparent substrate having top and bottom surfaces to the top surface of the layer of transflective material; and

providing the second transparent substrate with a predetermined surface configuration on one surface to enhance the diffusion and fringing of the reflected incident ambient light and the light emitted by the electroluminescent layer when energized.

17. The method according to claim 16, which further comprises the step of applying lacquer to the top surface of the second transparent substrate.

18. The method according to claim 16, which further comprises the step providing indicia on the top surface of the second transparent substrate.

19. The method according to claim 16, wherein the transflective material comprises aluminum.

20. The method according to claim 16, wherein the step of providing the predetermined surface configuration comprises scratching the top surface of the second transparent substrate with an abrasive instrument.

21. The method according to claim 20, wherein the abrasive instrument is a metallic brush.