WIRING BOARDS FOR ARRAY-BASED ELECTRONIC DEVICES

• US 20140062318A1
• Filed: 03/13/2013
• Published: 03/06/2014
• Est. Priority Date: 09/06/2012
• Status: Active Grant

• Current Assignee: Cooledge Lighting Inc.
• Original Assignee: Cooledge Lighting Inc.
• Inventors: Tischler, Michael A., Jungwirth, Paul
• Granted Patent: US 8,947,001 B2
• Time in Patent Office: Days
• US Class Current: 315/186
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/73204 the bump connector being embedded into the layer connector
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H05B 45/325 Pulse-width modulation [PWM]
• CPC Class Codes: H05B 45/40 Details of LED load circuits
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices

Abstract

In accordance with certain embodiments, lighting systems include one or more lightsheets each including a plurality of strings of light-emitting elements, control elements, and power conductors for supplying power to the light-emitting elements and control elements.

Claims

1-29. -29. (canceled)

30. A lighting system comprising:

a substantially planar lightsheet;

disposed on the lightsheet, first and second spaced-apart power conductors each extending in a first direction;

a plurality of light-emitting strings, each light-emitting string (i) comprising a plurality of interconnected light-emitting elements spaced along the light-emitting string, (ii) having a first end electrically coupled to the first power conductor, (iii) having a second end electrically coupled to the second power conductor, and (iv) being oriented in a second direction not parallel to the first direction, wherein the power conductors supply power to each of the light-emitting strings; and

a plurality of control elements each (i) electrically connected to at least one light-emitting string and (ii) configured to utilize power supplied from the power conductors to control the current to the at least one light-emitting string to which it is electrically connected,

wherein, for each light-emitting string, a pitch at which the light-emitting elements are spaced is (i) substantially constant and (ii) independent of a position of the control element electrically connected to the light-emitting string.

31. The lighting system of claim 30, wherein the lightsheet is separable, via a cut spanning the first and second power conductors and not crossing a light-emitting string, into two partial lightsheets each comprising (i) one or more light-emitting strings, (ii) one or more control elements, and (iii) portions of the first and second power conductors configured to supply power to and thereby illuminate the one or more light-emitting strings of the partial lightsheet.

32. The lighting system of claim 30, further comprising, electrically connected to the power conductors, a power supply configured to provide a substantially constant voltage to the power conductors.

33. The lighting system of claim 32, further comprising a second lightsheet (i) coupled to the lightsheet and (ii) comprising third and fourth spaced-apart power conductors disposed thereon, wherein the power supply is configured to supply the substantially constant voltage to the third and fourth power conductors.

34. The lighting system of claim 32, wherein each light-emitting string comprises only 12, 16, 18, or 20 light-emitting elements.

35. The lighting system of claim 34, wherein the substantially constant voltage provided to the first, second, third, and fourth power conductors does not exceed approximately 60 volts.

37. The lighting system of claim 32, wherein the power supply is configured to adjust a light output of the lightsheet by pulse-width-modulating the substantially constant voltage.

45. The lighting system of claim 30, wherein, over the lightsheet, light-emitting elements are spaced apart at a substantially constant light-emitting-element pitch maintained between light-emitting elements of different light-emitting strings.

46. The lighting system of claim 30, wherein each control element is electrically connected to a different light-emitting string.

51. The lighting system of claim 30, wherein light-emitting elements of each light-emitting string are connected in series.

52. The lighting system of claim 30, wherein at least one control element is configured to provide a substantially constant current to the at least one light-emitting string to which the control element is connected.

53. The lighting system of claim 30, wherein at least one light-emitting element emits substantially white light.

54. The lighting system of claim 30, wherein at least one light-emitting element comprises a bare-die light-emitting diode.

55. The lighting system of claim 30, wherein at least one light-emitting element comprises a packaged light-emitting diode.

56. The lighting system of claim 30, wherein at least one light-emitting string is a folded string having a straight-line length longer than a dimension of the lightsheet spanned by the power conductors.

57. The lighting system of claim 56, wherein (i) the light-emitting elements of the folded string have a positive terminal and a negative terminal, and (ii) all of the positive terminals are oriented toward a single edge of the lightsheet notwithstanding folds in the folded string.

36. (canceled)

38-41. -41. (canceled)

47-50. -50. (canceled)

58-140. -140. (canceled)