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US 7,126,653 B2Granted
Liquid crystal picture screen with collimator having microprisms
AssigneeKoninklijke Philips Electronics N.V.
InventorsHarald Glaeser, Hans-Helmut Bechtel, Dietrich Bertram
Life of this patent
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Abstract
The invention relates to a liquid crystal picture screen provided with a background lighting system which comprises at least one light source and a collimator formed by hourglass-shaped microprisms. The light of the light source can be effectively collimated within a desired angular range by means of the collimator.
Claims16
A liquid crystal picture screen comprising:
- a liquid crystal panel, and
- a background lighting system that includes:
- at least one light source, and
- a collimator that includes a plurality of microprisms;
- wherein
- each microprism of the plurality of microprisms includes:
- a light entry surface,
- a light exit surface at a distance from the light entry surface,
- at least one side face between the light entry surface and the light exit surface, and
- at least one portion between the light entry surface and the light exit surface that has a narrower cross-section than each of the light entry and exit surfaces.
7 more elements
A background lighting system comprising:
- at least one light source, and
- a collimator that includes a plurality of microprisms,
- wherein
- each microprism of the plurality of microprisms includes:
- a light entry surface,
- a light exit surface at a distance from the light entry surface,
- at least one side face between the light entry surface and the light exit surface, and
- at least one portion between the light entry surface and the light exit surface that has a narrower cross-section than each of the light entry and exit surfaces.
5 more elements
A collimator comprising
- a plurality of microprisms,
- each microprism of the plurality of microprisms including:
- a light entry surface,
- a light exit surface at a distance from the light entry surface,
- at least one side face between the light entry surface and the light exit surface, and
- at least one portion between the light entry surface and the light exit surface that has a narrower cross-section than each of the light entry and exit surfaces.
3 more elements
A luminaire comprising:
- at least one light source,
- a housing, and
- a collimator that includes a plurality of microprisms,
- wherein
- each microprism of the plurality of microprisms includes:
- a light entry surface,
- a light exit surface at a distance from the light entry surface,
- at least one side face between the light entry surface and the light exit surface, and
- at least one portion between the light entry surface and the light exit surface that has a narrower cross-section than each of the light entry and exit surfaces.
6 more elements
Dependencies are inferred from the claim text.