Illumination – Edge lighted panel – Light guide
Reexamination Certificate
2011-06-14
2011-06-14
Sawhney, Hargobind S (Department: 2885)
Illumination
Edge lighted panel
Light guide
C362S097100, C362S097300
Reexamination Certificate
active
07959343
ABSTRACT:
The invention relates to an illumination system (4) comprising at least one light source (10) for emitting light of a predominant wavelength (W), and a light-transmitting panel (14) which comprises a light-emitting window (16), a rear wall (18) situated opposite said light-emitting window, and edge walls (20) extending between the light-emitting window and the rear wall. Light from the LED is coupled into the light-transmitting panel and is transported substantially via total internal reflection. The rear wall is provided with a two-dimensional array of recesses (22, 24). A sub-set of recesses (22) is distributed substantially regularly on the rear wall. Each recess (22A,22B,22C) from the sub-set (22) comprises scattering material (26). When light from the light-transmitting panel reaches the scattering material of the recess, part of the light (W′) is coupled out of the light-transmitting panel via scattering. The regular distribution of the scattering material on the rear wall improves the uniformity of the light emitted via the light-emitting window. In an embodiment of the illumination system, the scattering material comprises a luminescent material (28), which absorbs light of the predominant wavelength (UV) and emits light of a further predominant wavelength (R, G, B).
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Cornelissen Hugo J.
Ijzerman Willem L.
Beloborodov Mark L.
Koninklijke Philips Electronics , N.V.
Salazar John F.
Sawhney Hargobind S
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