LIGHT EMITTING PANELS FOR DISPLAY DEVICES

• US 20080100771A1
• Filed: 10/25/2006
• Published: 05/01/2008
• Est. Priority Date: 10/25/2006
• Status: Active Grant

• Current Assignee: Ademco Inc. (Resideo Technologies, Inc.)
• Original Assignee: Honeywell International Inc.
• Inventors: Ableitner, Jason L.
• Granted Patent: US 7,708,442 B2
• Time in Patent Office: Days
• US Class Current: 349/61
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like

Abstract

Devices and assemblies for providing light to a display panel, including methods of attaching such devices and assemblies to a circuit board, are disclosed. An illustrative device can include a light emitting panel including at least one light interface for receiving light from a light source. The light interface may define an aperture adapted to receive a portion of the light source, forming an air gap between the light source and interface. A number of centering ribs and/or beveled sections can be used to align the light source within the aperture during assembly of the device to a circuit board.

Claims

1. A device for providing backlighting or front-lighting to a display panel, the device comprising:

a light emitting panel having an emitting face, a rear face, and an edge;

the light emitting panel including at least one light interface for receiving light from a light source spaced apart from the light emitting panel, the light interface defining an aperture adapted to at least partially receive a portion of the light source therein; and

at least one guiding member for aligning the light source within the light interface aperture.

2. The device of claim 1, wherein the light emitting panel includes a light guide adapted to receive incident light from a light receiving surface of the interface.

3. The device of claim 2, wherein the light guide includes a curved or bent section.

4. The device of claim 1, wherein the light interface aperture is adapted to at least partially surround the light source.

5. The device of claim 1, wherein the light interface aperture is dimensioned to maintain a non-zero air gap between a light receiving surface of the interface and a light emitting surface of the light source.

6. The device of claim 1, wherein the light interface aperture is dimensioned to maintain a uniform air gap between a light receiving surface of the interface and a light emitting surface of the light source.

7. The device of claim 6, wherein the light interface aperture is further dimensioned to maintain a non-zero air gap between the light receiving surface of the interface and the light emitting surface of the light source.

8. The device of claim 1, wherein the light interface aperture includes a semi-circular notch or groove.

9. The device of claim 8, wherein said at least one guiding member includes one or more ribs extending inwardly within the semi-circular notch or groove.

10. The device of claim 8, wherein said at least one guiding member includes a beveled section of the semi-circular notch or groove located on the rear face of the light emitting panel.

11. The device of claim 10, wherein the beveled section includes a plurality of beveled sections.

12. The device of claim 1, further comprising a reflective element coupled to the rear face of the light emitting panel.

13. A backlight assembly mountable to a circuit board having a component side and a non-component side, the backlight assembly comprising:

a display panel;

at least one light source coupled to the circuit board; and

a light emitting panel having an emitting face, a rear face opposite the emitting face, and an edge, the light emitting panel including a light aperture adapted to form an air gap between the at least one light source and a light receiving surface of the light emitting panel;

wherein the light aperture includes a number of inwardly extending ribs adapted to align the at least one light source within the aperture.

14. The backlight assembly of claim 13, wherein the light source is detached from the light emitting panel.

15. The backlight assembly of claim 13, wherein the light emitting panel includes a light guide adapted to receive light from the light receiving surface of the light emitting panel.

16. The backlight assembly of claim 15, wherein the light guide includes a curved or bent section.

17. The backlight assembly of claim 13, wherein the light aperture is adapted to at least partially surround the light source.

18. The device of claim 13, wherein the light aperture is dimensioned to maintain a non-zero air gap between the light receiving surface of the light emitting panel and a light emitting surface of the light source.

19. The backlight assembly of claim 13, wherein the light aperture is dimensioned to maintain a uniform air gap between the light receiving surface of the light emitting panel and a light emitting surface of the light source.

20. The device of claim 19, wherein the light aperture is further dimensioned to maintain a non-zero air gap between the light receiving surface of the light emitting panel and the light emitting surface of the light source.

21. The backlight assembly of claim 13, wherein the light aperture includes a semi-circular notch or groove.

22. The backlight assembly of claim 21, wherein the semi-circular notch or groove includes at least one beveled section located on the rear face of the light emitting panel.

23. The backlight assembly of claim 13, further comprising a reflective element coupled to the rear face of the light emitting panel.

24. The backlight assembly of claim 13, wherein the rear face of the light emitting panel is adapted to lie adjacent to the non-component side of the circuit board.

25. The backlight assembly of claim 13, wherein the rear face of the light emitting panel is adapted to lie adjacent to and flush with the non-component side of the circuit board.

26. The backlighting assembly of claim 13, wherein said at least one light source includes a light emitting diode.

27. The backlight assembly of claim 26, wherein the leads of the light emitting diode are coupled to the component side of the printed circuit board using a plug-in connector.

28. The backlight assembly of claim 13, further comprising a conductive member electrically coupling the display panel to the circuit board.

29. The backlight assembly of claim 28, wherein the conductive member includes an elastomeric zebra-strip having a reflective element.

30. The backlight assembly of claim 28, further comprising a display retainer adapted to support the display panel, conductive member, and light emitting panel adjacent to the non-component side of the circuit board.

31. A method for attaching a backlight assembly to a circuit board having a component side and a non-component side, the method comprising the steps of:

attaching at least one light source to the circuit board;

providing a backlight assembly including a display panel, a light emitting panel including a light interface, and display retainer, the light interface defining an aperture having at least one guiding member therein;

assembling the display panel and light emitting panel within the display retainer; and

securing the assembled display retainer to the circuit board;

wherein, during said step of securing the assembled display retainer to the circuit board, the at least one guiding member is adapted to align the light source within the aperture forming an air gap between the light source and interface.

32. The method of claim 31, wherein the display retainer includes a number of locking tabs, and wherein said step of securing the assembled display retainer to the circuit board includes the step of securing the locking tabs into a number of slots on the circuit board.

33. The method of claim 31, wherein said at least one guiding member includes a number of ribs extending inwardly within the aperture.

34. The method of claim 31, wherein said at least one guiding member includes a beveled section of the aperture.

35. The method of claim 31, wherein said step of attaching the at least one light source to the circuit board includes the steps of:

mounting a plug-in connector to the component side of the circuit board; and

inserting a number of leads of the light source through several openings formed through the circuit board and plug-in connector with the light source positioned adjacent to the non-component side of the circuit board.