Backlight module having a prisim reflector
AssigneeBlackBerry Limited
InventorsHsin Chin Lee, Michael Lorne Purdy, Choongho Lee
Life of this patent
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Abstract
A backlight module for illuminating a display is described. The backlight module may be provided in an electronic device along with a light source for illuminating an LCD display. The backlight module includes a diffuser, a light guide having a top surface and a bottom surface, a reflector, and a prism structure positioned between the light guide bottom surface and the reflector. The prism structure has a plurality of prisms extending towards the light guide. The prism structure may include a film or a top portion of the reflector having a plurality of prisms extending towards the light guide.
Claims16
A backlight module comprising:
- a planar light diffuser;
- a planar light guide located directly below the light diffuser;
- a prism structure located directly below the light guide and having a plurality of asymmetric triangular prisms extending upwardly towards a bottom surface of the light guide, the prism structure defining channels extending perpendicular to light incident at an edge of the light guide, each asymmetric triangular prism having a first base angle smaller than a second base angle, wherein an air gap is defined between at least some regions of a top surface of the prism structure and the bottom surface of the light guide;
- and
- a planar reflector located directly below the prism structure.
An electronic device comprising
- a backlight module including:
- a planar light diffuser;
- a planar light guide located directly below the light diffuser;
- a prism structure located directly below the light guide and having a plurality of asymmetric triangular prisms extending upwardly towards the bottom surface of the light guide, the prism structure defining channels extending perpendicular to light incident at an edge of the light guide, each asymmetric triangular prism having a first base angle smaller than a second base angle, wherein an air gap is defined between at least some regions of a top surface of the prism structure and a bottom surface of the planar light guide;
- and
- a planar reflector located directly below the prism structure, wherein an air gap is defined between the prism structure and the planar reflector;
- a light source arranged to supply light to the edge of the light guide.
A backlight module comprising:
- a planar light diffuser;
- a brightness enhancement film located directly above the light diffuser;
- a planar light guide located directly below the light diffuser;
- a prism structure located directly below the light guide and having a plurality of asymmetric triangular prisms extending upwardly towards a bottom surface of the light guide, the prism structure defining channels extending perpendicular to light incident at an edge of the light guide, each asymmetric triangular prism having a first base angle smaller than a second base angle, wherein an air gap is defined between at least some regions of a top surface of the prism structure and a bottom surface of the light guide;
- and
- a planar reflector located directly below the prism structure.
Dependencies are inferred from the claim text.