| US 7,548,670 B2 | ||
| Thin and efficient light collimating device | ||
| Willem Lubertus Ijzerman, Eindhoven (Netherlands); Michel Cornelis Josephus Marie Vissenberg, Eindhoven (Netherlands); Marcellinus Petrus Carolus Michael Krijn, Eindhoven (Netherlands); and Hugo Johan Cornelissen, Eindhoven (Netherlands) | ||
| Assigned to Koninklijke Philips Electronics N.V., Eindhoven (Netherlands) | ||
| Appl. No. 12/92,990 PCT Filed Oct. 27, 2006, PCT No. PCT/IB2006/053963 § 371(c)(1), (2), (4) Date May 08, 2008, PCT Pub. No. WO2007/054848, PCT Pub. Date May 18, 2007. |
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| Claims priority of application No. 05110683 (EP), filed on Nov. 14, 2005. | ||
| Prior Publication US 2008/0252986 A1, Oct. 16, 2008 | ||
| Int. Cl. G02B 6/32 (2006.01) | ||
| U.S. Cl. 385—33 [385/129; 385/146; 359/443; 359/641] | 19 Claims |
| 1. A light collimating device comprising a wave guide plate (100) having a first surface (101), an opposing faceted second surface (102) comprising a plurality of planar parallel portions (103) and a plurality of facets (104) connecting said planar parallel portions (103) and at least one surface (105) for receiving light, characterized in that,
each facet (104) is formed at a non-right angle (β) to said planar parallel portions (103) and,
said device further comprises a plurality of collimating refractive elements (106), wherein each collimating refractive element (106) corresponds to a separate one of the plurality of facets (104), and each collimating refractive element (106) is located in the beam path of at least the major part of light being reflected on the corresponding facet (104) and extracted from said wave guide plate (100).
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