Projection display with led-based illumination module
AssigneeKoninklijke Philips Electronics N.V.
InventorsMarcellinus Petrus Carolus Michael Krijn, Ramon Pascal Van Gorkom
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Abstract
A projection display device comprising an illumination module (100; 200; 301) and at least one projection lens (304) for projecting light from said illumination module (301) onto a projection screen (305) is provided. The illumination module (100) comprises at least two lighting units (103, 104), each comprising of a light emitting diode (113, 114) and a collimating funnel (130, 140) arranged in front thereof. The output areas (132, 142) of the two funnels are at least partly overlapping. Hence, light collimation and mixing is possible in the same structure, yielding an etendue conserving illumination module.
Claims11
A projection display device (300) comprising an illumination module (100;
- 200;
- 301) and at least one projection lens (304) for projecting light from said illumination module (301) onto a projection screen (305), said illumination module comprising:
- at least two lighting units (103, 104), each comprising a collimating funnel (130, 140) arranged in front of a corresponding light emitting diode (113, 114),
- each collimating funnel (130, 140) comprising an input area (131, 141) arranged towards said corresponding light emitting diode (113, 114), an output area (132, 142) being larger than said input area (131, 141) and sidewalls (133, 143) connecting said input area (131, 141) and said output area (132, 142), wherein
- the sidewalls (133, 143) of each collimating funnel (130, 140) are reflective for light from the corresponding light emitting diode (113, 114),
- the output area (132) of each of the collimating funnels (130) at least partly overlaps with the output area (142) of at least one other of said at least two collimating funnels (140)
- a portion (135, 145) of the sidewalls of each of the collimating funnels (130, 140), which portion is located in the light path between the input area (141, 131) and the output area (142, 132) of one other of said at least two collimating funnels (140, 130), is transmissive for light from the light emitting diode (114, 113) corresponding to said one other collimating funnel (140, 130).
An image light generating system for a projection display device, comprising an illumination module (100, 200, 301) and an image forming device (302) arranged to be illuminated by said illumination module and to spatially modulate light from said illumination module (301) to form image light, wherein illumination module comprises:
- at least two lighting units (103, 104), each comprising a collimating funnel (130, 140) arranged in front of a corresponding light emitting diode (113, 114),
- each collimating funnel (130, 140) comprising an input area (131, 141) arranged towards said corresponding light emitting diode (113, 114), an output area (132, 142) being larger than said input area (131, 141) and sidewalls (133, 143) connecting said input area (131, 141) and said output area (132, 142), wherein
- the sidewalls (133, 143) of each collimating funnel (130, 140) are reflective for light from the corresponding light emitting diode (113, 114),
- the output area (132) of each of the collimating funnels (130) at least partly overlaps with the output area (142) of at least one other of said at least two collimating funnels (140)
- portion (135) of the sidewalls of each of the collimating funnels (130), which portion is located in the light path between the input area (141) and the output area (142) of one other of said at least two collimating funnels (140), is transmissive for light from the light emitting diode (114) corresponding to said one other collimating funnel (140).
Dependencies are inferred from the claim text.