Prismatic film backlight
First Claim
Patent Images
1. A light guide comprising:
- a prismatic film with parallel prisms on a first side of the prismatic film;
a low-index film on the prisms as an intermediate layer;
a cover layer having a first surface that contacts the intermediate layer, the cover layer having a substantially flat second surface opposite to the first surface; and
a reflective layer facing a second side of the prismatic film, the reflective layer disposed at an angle with respect to the second side of the prismatic film.
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Abstract
A selectively light-reflecting sheet (30) includes a prismatic film (1) with parallel prisms (10) on its face, a low-index film (3) on the prisms and a layer (5) on the low-index film, this layer having a substantially flat surface. This results in a low effective index, which means that light incident at steeper angles on the prismatic film (1) will pass through it. This “leaky” effect can be used in conjunction with a reflector sheet (20) in a tapered-waveguide arrangement to construct a lightweight backlight.
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Citations
20 Claims
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1. A light guide comprising:
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a prismatic film with parallel prisms on a first side of the prismatic film; a low-index film on the prisms as an intermediate layer; a cover layer having a first surface that contacts the intermediate layer, the cover layer having a substantially flat second surface opposite to the first surface; and a reflective layer facing a second side of the prismatic film, the reflective layer disposed at an angle with respect to the second side of the prismatic film. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A light guide comprising:
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a sheet comprising; a prismatic film with parallel prisms on a first side; a cover layer including a first surface facing the parallel prisms, the cover layer having a substantially flat second surface opposite to the first surface; and a low-index intermediate layer located between the prismatic film and the cover layer; and a reflective layer disposed in a spaced relationship with the sheet, the reflective layer positioned to reflect light toward a second side of the prismatic film. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A display apparatus comprising:
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a light guide comprising; a prismatic film with first parallel prisms on a first side of the prismatic film; an intermediate layer including a low-index film deposited on the first parallel prisms on the first side of the prismatic film; and a cover layer having a first surface contacting the intermediate layer opposite to the prismatic film, the cover layer having second parallel prisms on the first surface contacting the intermediate layer, the second parallel prisms having prism apexes aligned with prism bases of the first parallel prisms, the cover layer having a substantially flat second surface opposite to the first surface; and a reflective layer facing a second side of the prismatic film, the reflective layer positioned at an angle with respect to the second side of the prismatic film to reflect light into the second side of the prismatic film; and a light source arranged to inject light into the light guide along a prism axis direction. - View Dependent Claims (17, 18, 19, 20)
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Specification