Back to results
US 7,802,893 B2Granted
Bulb reflector for thin direct lit backlights
AssigneeSabic Innovative Plastics IP B.V.
InventorsJohn Frederick Graf, Dennis Joseph Coyle
Life of this patent
Estimating the term…
Abstract
In one embodiment, a backlight assembly comprises: a bulb having a bulb first side and a bulb second side located on a side of the bulb opposite the first side, a reflector plate disposed on the bulb first side, and a front bulb reflector disposed over the bulb second side. The front bulb reflector has a partially reflective member capable of reflecting greater than or equal to 60% of light from the bulb toward the reflector plate, and an inner surface on a reflector second side located opposite the reflector first side. The overall geometry of the front bulb reflector is concave on the reflector second side and convex on the reflector first side.
Claims16
A backlight assembly, comprising:
- a bulb having a bulb first side and a bulb second side located on a side of the bulb opposite the first side;
- a reflector plate disposed on the bulb first side;
- a front bulb reflector disposed over the bulb second side, the front bulb reflector having a partially reflective member capable of reflecting greater than or equal to 60% of light from the bulb toward the reflector plate, and an inner surface on a reflector second side located opposite the reflector first side, wherein an overall geometry of the front bulb reflector is concave on the reflector second side and convex on the reflector first side;
- and
- a diffuser plate disposed on a side of the front bulb reflector opposite the bulb, and comprising a ratio of bulb hiding difficulty of less than or equal to 0.35.
2 more elements
A backlight assembly, comprising:
- a reflector plate;
- a plurality of bulbs positioned in front of the reflector;
- a front bulb reflector comprising
- an outward facing surface curved over and positioned partially around each of the plurality of bulbs, the outward facing surface having a plurality of reflecting structures radially arranged upon the outward facing surface to reflect light towards the reflector plate;
- an inner surface facing the plurality of bulbs;
- and
- a diffuser plate positioned on a side of the front bulb reflector opposite the plurality of bulbs.
4 more elements
A backlight assembly comprising:
- a bulb having a bulb first side and a bulb second side located on a side of the bulb opposite the first side;
- a reflector plate disposed on the bulb first side;
- a front bulb reflector disposed over the bulb second side, the front bulb reflector having an outward facing surface having a plurality of reflecting structures on a reflector first side, the plurality of reflecting structures capable of reflecting light from the bulb toward the reflector plate, and an inner surface on a reflector second side located opposite the reflector first side, wherein an overall geometry of the front bulb reflector is concave on the reflector second side and convex on the reflector first side;
- and
- a diffuser plate disposed on a side of the front bulb reflector opposite the bulb, and comprising a ratio of bulb hiding difficulty of less than or equal to 0.35.
2 more elements
A backlight assembly comprising:
- a bulb having a bulb first side and a bulb second side located on a side of the bulb opposite the first side;
- a reflector plate disposed on the bulb first side;
- a front bulb reflector disposed over the bulb second side, the front bulb reflector having an outward facing surface having a plurality of reflecting structures on a reflector first side, the plurality of reflecting structures capable of reflecting light from the bulb toward the reflector plate, and an inner surface on a reflector second side located opposite the reflector first side, wherein an overall geometry of the front bulb reflector is concave on the reflector second side and convex on the reflector first side;
- and
- having an absolute hiding power of less than or equal to 3% when viewed through a diffuser plate covering the plurality of front bulb reflectors.
2 more elements
A backlight assembly comprising:
- a bulb having a bulb first side and a bulb second side located on a side of the bulb opposite the first side;
- a reflector plate disposed on the bulb first side;
- a front bulb reflector disposed over the bulb second side, the front bulb reflector having an outward facing surface having a plurality of reflecting structures on a reflector first side, the plurality of reflecting structures capable of reflecting light from the bulb toward the reflector plate, and an inner surface on a reflector second side located opposite the reflector first side, wherein an overall geometry of the front bulb reflector is concave on the reflector second side and convex on the reflector first side;
- and
- wherein an apex angle changes across the first side.
2 more elements
A backlight assembly comprising:
- a bulb having a bulb first side and a bulb second side located on a side of the bulb opposite the first side;
- a reflector plate disposed on the bulb first side;
- a front bulb reflector disposed over the bulb second side, the front bulb reflector having an outward facing surface having a plurality of reflecting structures on a reflector first side, the plurality of reflecting structures capable of reflecting light from the bulb toward the reflector plate, and an inner surface on a reflector second side located opposite the reflector first side, wherein an overall geometry of the front bulb reflector is concave on the reflector second side and convex on the reflector first side;
- and
- wherein the reflecting structures have an apex angle of 60 to 120 degrees.
2 more elements
A backlight assembly comprising:
- a bulb having a bulb first side and a bulb second side located on a side of the bulb opposite the first side;
- a reflector plate disposed on the bulb first side;
- a front bulb reflector disposed over the bulb second side, the front bulb reflector having an outward facing surface having a plurality of reflecting structures on a reflector first side, the plurality of reflecting structures capable of reflecting light from the bulb toward the reflector plate, and an inner surface on a reflector second side located opposite the reflector first side, wherein an overall geometry of the front bulb reflector is concave on the reflector second side and convex on the reflector first side;
- and
- wherein the front bulb reflector further comprises a trough portion, wherein the reflecting structures are selected from a group consisting of prisms and parabolas.
2 more elements
Dependencies are inferred from the claim text.