Laser oscillator

• US 20050058162A1
• Filed: 09/08/2004
• Published: 03/17/2005
• Est. Priority Date: 09/12/2003
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Nomura, Ryoji, Shimomura, Akihisa
• Granted Patent: US 7,502,392 B2
• Time in Patent Office: Days
• US Class Current: 372/9
• CPC Class Codes: H01S 5/02212 Can-type, e.g. TO-CAN housings with emission along or parallel to symmetry axis
• CPC Class Codes: H01S 5/02345 Wire-bonding
• CPC Class Codes: H01S 5/04256 characterised by the configuration
• CPC Class Codes: H01S 5/04257 having positive and negative electrodes on the same side of the substrate
• CPC Class Codes: H01S 5/1039 Details on the cavity length
• CPC Class Codes: H01S 5/18388 Lenses
• CPC Class Codes: H01S 5/36 comprising organic materials
• CPC Class Codes: H01S 5/423 having a vertical cavity

Abstract

The present invention provides a laser oscillator using an electroluminescent material that can enhance directivity of emitted laser light and resistance to a physical impact. The laser oscillator has a first layer including a concave portion, a second layer formed over the first layer to cover the concave portion, and a light emitting element formed over the second layer to overlap the concave portion, wherein the second layer is planarized, an axis of laser light obtained from the light emitting element intersects with a planarized surface of the second layer, the first layer has a curved surface in the concave portion, and a refractive index of the first layer is lower than that of the second layer.

Claims

1. A laser oscillator comprising:

a first layer having a concave portion;

a second layer formed over the first layer to cover the concave portion; and

a light emitting element formed over the second layer to overlap the concave portion,

wherein an optical axis of laser light emitted from the light emitting element intersects with a planarized surface of the second layer;

wherein the first layer has a curved surface in the concave portion; and

wherein a refractive index of the first layer is lower than that of the second layer.

2. A laser pointer having the laser oscillator according to claim 1.

3. An LCD having the laser oscillator according to claim 1.

4. A projector having the laser oscillator according to claim 1.

5. A laser oscillator comprising:

a first layer having a concave portion;

a reflective film formed over the first layer to cover the concave portion;

a second layer formed over the reflective film; and

a light emitting element formed over the second layer to overlap the concave portion,

wherein an optical axis of laser light emitted from the light emitting element intersects with a planarized surface of the second layer;

wherein the first layer has a curved surface in the concave portion; and

wherein the reflective film has a curved surface in the concave portion of the first layer.

6. A laser pointer having the laser oscillator according to claim 5.

7. An LCD having the laser oscillator according to claim 5.

8. A projector having the laser oscillator according to claim 5.

9. A laser oscillator comprising:

a first layer having a concave portion;

a second layer formed over the first layer to cover the concave portion; and

a light emitting element formed over the second layer to overlap the concave portion,

wherein the light emitting element includes a first electrode formed over the second layer, an electroluminescent layer formed over the first electrode, and a second electrode formed over the electroluminescent layer;

wherein light generated in the electroluminescent layer is oscillated between the first electrode and the second electrode, thereby emitting laser light from the first electrode toward the concave portion;

wherein the first layer has a curved surface in the concave portion; and

wherein a refractive index of the first layer is lower than that of the second layer.

10. A laser pointer having the laser oscillator according to claim 9.

11. An LCD having the laser oscillator according to claim 9.

12. A projector having the laser oscillator according to claim 9.

13. A laser oscillator comprising:

a first layer having a concave portion;

a reflective film formed over the first layer to cover the concave portion;

a second layer formed over the reflective film; and

a light emitting element formed over the second layer to overlap the concave portion,

wherein the light emitting element includes a first electrode formed over the second layer, an electroluminescent layer formed over the first electrode, and a second electrode formed over the electroluminescent layer;

wherein light generated in the electroluminescent layer is oscillated between the first electrode and the second electrode, thereby emitting laser light from the first electrode toward the concave portion;

wherein the first layer has a curved surface in the concave portion; and

wherein the reflective film has a curved surface in the concave portion of the first layer.

14. A laser pointer having the laser oscillator according to claim 13.

15. An LCD having the laser oscillator according to claim 13.

16. A projector having the laser oscillator according to claim 13.

17. A laser oscillator comprising:

a first layer having a concave portion;

a second layer formed over the first layer to cover the concave portion;

a reflective film formed over the second layer; and

a light emitting element formed over the reflective film to overlap the concave portion,

wherein the light emitting element includes a first electrode formed over the reflective film, an electroluminescent layer formed over the first electrode, and a second electrode formed over the electroluminescent layer;

wherein light generated in the electroluminescent layer is oscillated between the reflective film and the second electrode, thereby emitting laser light from the reflective film toward the concave portion;

wherein the first layer has a curved surface in the concave portion; and

wherein a refractive index of the first layer is lower than that of the second layer.

18. A laser pointer having the laser oscillator according to claim 17.

19. An LCD having the laser oscillator according to claim 17.

20. A projector having the laser oscillator according to claim 17.

21. A laser oscillator comprising:

a first layer having a concave portion;

a first reflective film formed over the first layer to cover the concave portion;

a second layer formed over the first reflective film;

a second reflective film formed over the second layer; and

a light emitting element formed over the second reflective film to overlap the concave portion,

wherein the light emitting element includes a first electrode formed over the second reflective film, an electroluminescent layer formed over the first electrode, a second electrode formed over the electroluminescent layer;

wherein light generated in the electroluminescent layer is oscillated between the second reflective film and the second electrode, thereby emitting laser light from the second reflective film toward the concave portion;

wherein the first layer has a curved surface in the concave portion; and

wherein the first reflective film has a curved surface in the concave portion of the first layer.

22. A laser pointer having the laser oscillator according to claim 21.

23. An LCD having the laser oscillator according to claim 21.

24. A projector having the laser oscillator according to claim 21.

25. A laser oscillator comprising:

a light emitting element; and

a light-transmitting layer formed to cover the light emitting element,

wherein the light-transmitting layer has a convex portion to overlap the light emitting element;

wherein an optical axis of laser light emitted from the light emitting element intersects with the light-transmitting layer; and

wherein the light-transmitting layer has a curved surface in the convex portion.

26. A laser pointer having the laser oscillator according to claim 25.

27. An LCD having the laser oscillator according to claim 25.

28. A projector having the laser oscillator according to claim 25.

29. A laser oscillator according to claim 25,

wherein the light emitting element formed over a first layer.

30. A laser pointer having the laser oscillator according to claim 29.

31. An LCD having the laser oscillator according to claim 29.

32. A projector having the laser oscillator according to claim 29.

33. A laser oscillator comprising:

a light emitting element formed over a first layer; and

a second layer that is light-transmitting and that is formed to cover the light emitting element,

wherein the second layer a convex portion to overlap the light emitting element;

wherein the light emitting element includes a first electrode formed over the first layer, an electroluminescent layer formed over the first electrode, and a second electrode formed over the electroluminescent layer;

wherein light generated in the electroluminescent layer is oscillated between the first electrode and the second electrode, thereby emitting laser light from the second electrode toward the convex portion; and

wherein the second layer has a curved surface in the convex portion.

34. A laser pointer having the laser oscillator according to claim 33.

35. An LCD having the laser oscillator according to claim 33.

36. A projector having the laser oscillator according to claim 33.

37. A laser oscillator comprising:

a reflective film formed over a first layer;

a light emitting element formed over the reflective film; and

a second layer that is light-transmitting and that is formed to cover the light emitting element,

wherein the second layer has a convex portion to overlap the light emitting element;

wherein the light emitting element includes a first electrode formed over the reflective film, an electroluminescent layer formed over the first electrode, and a second electrode formed over the electroluminescent layer;

wherein light generated in the electroluminescent layer is oscillated between the reflective film and the second electrode, thereby emitting laser light from the second electrode toward the convex portion; and

wherein the second layer has a curved surface in the convex portion.

38. A laser pointer having the laser oscillator according to claim 37.

39. An LCD having the laser oscillator according to claim 37.

40. A projector having the laser oscillator according to claim 37.

41. A laser oscillator comprising:

a first layer having a concave portion;

a second layer that is light-transmitting and that is formed over the first layer to cover the concave portion;

a light emitting element formed over the second layer to overlap the concave portion; and

a third layer that is light-transmitting and that is formed to cover the light emitting element,

wherein the third layer has a convex portion to overlap the light emitting element;

wherein the first layer has a curved surface in the concave portion;

wherein the third layer has a curved surface in the convex portion,

wherein an optical axis of laser light emitted from the light emitting element intersects with a planarized surface of the second layer; and

wherein a refractive index of the first layer is lower than that of the second layer.

42. A laser pointer having the laser oscillator according to claim 41.

43. An LCD having the laser oscillator according to claim 41.

44. A projector having the laser oscillator according to claim 41.

45. A laser oscillator comprising:

a first layer having a concave portion;

a reflective film formed over the first layer to cover the concave portion;

a second layer that is light-transmitting and that is formed over the reflective film;

a light emitting element formed over the second layer to overlap with the concave portion; and

a third layer that is light-transmitting and that is formed to cover the light emitting element,

wherein the third layer has a convex portion to overlap the light emitting element;

wherein the first layer has a curved surface in the concave portion;

wherein the third layer has a curved surface in the convex portion;

wherein the reflective film has a curved surface in the concave portion of the first layer;

wherein an optical axis of laser light emitted from the light emitting element intersects with a planarized surface of the second layer; and

wherein a refractive index of the first layer is lower than that of the second layer.

46. A laser pointer having the laser oscillator according to claim 45.

47. An LCD having the laser oscillator according to claim 45.

48. A projector having the laser oscillator according to claim 45.