Low-absorptive diffuser sheet and film stacks for direct-lit backlighting
There is provided an optical diffuser sheet. The optical diffuser sheet has a first surface and a second surface opposite to the first surface. The first surface has a plurality of optical structures arranged to diffuse and direct light illuminated onto the first surface. The optical diffuser sheet when illuminated is characterized by an absorption of less than 10% and an absolute hiding power of less than 10%.
1 . An optical diffuser sheet, comprising:
a first surface having a plurality of optical structures arranged to diffuse and direct light illuminated onto the first surface, wherein the optical structures have a concave cross-section; and
a second surface opposite to the first surface.
2 . The optical diffuser sheet of claim 1 , wherein the second surface has a plurality of optical structures arranged to diffuse and direct light illuminated onto the second surface.
3 . An optical diffuser sheet, comprising:
a first surface having a plurality of optical structures arranged to diffuse and direct light illuminated onto the first surface, wherein the optical structures have a sinusoidal wave cross-section; and
a second surface opposite to the first surface.
4 . The optical diffuser sheet of claim 3 , wherein the second surface has a plurality of optical structures arranged to diffuse and direct light illuminated onto the second surface.
5 . An optical diffuser sheet, comprising:
a first surface having a plurality of optical structures arranged to diffuse and direct light illuminated onto the first surface, wherein a shape and dimensions of each optical structure represents a random modulation of a corresponding idealized structure; and
a second surface opposite to the first surface.
6 . The optical diffuser sheet of claim 5 , wherein the second surface has a plurality of optical structures arranged to diffuse and direct light illuminated onto the second surface.
7 . The optical diffuser sheet of claim 5 , wherein the shape and dimensions of each optical structure represents a random modulation of a corresponding idealized structure in a lateral direction.
8 . The optical diffuser sheet of claim 5 , wherein the shape and dimensions of each optical structure represents a random modulation of a corresponding idealized structure in a vertical direction.
9 . An optical diffuser sheet, comprising:
a first surface having a plurality of optical structures arranged to diffuse and direct light illuminated onto the first surface; and
a second surface opposite to the first surface,
wherein the optical diffuser sheet when illuminated is characterized by an absorption of less than 10% and an absolute hiding power of less than 10%.
10 . The optical diffuser sheet of claim 9 , wherein the optical diffuser sheet when illuminated is characterized by an absorption of less than 7% and an absolute hiding power of less than 7%.
11 . The optical diffuser sheet of claim 10 , wherein the optical diffuser sheet when illuminated is characterized by an absorption of less than 4% and an absolute hiding power of less than 4%.
12 . The optical diffuser sheet of claim 9 , wherein the optical structures have one of a half cylinder cross-section or a sinusoidal wave cross-section.
13 . The optical diffuser sheet of claim 9 , wherein the second surface has a plurality of optical structures arranged to diffuse and direct light illuminated onto the second surface.
14 . The optical diffuser sheet of claim 9 , wherein the optical diffuser sheet has a density of light scattering particles to provide light diffusion.
15 . An optical display assembly comprising:
a light provider comprising a plurality of light sources;
an optical diffuser sheet comprising:
a first surface having a plurality of optical structures arranged to diffuse and direct light illuminated onto the first surface from the light provider; and
a second surface opposite to the first surface; and
a diffuser film over the light provider and optical diffuser sheet, arranged to receive light from the optical diffuser sheet, the diffuser film having a density of light scattering particles to provide light diffusion and/or a rough surface to provide light diffusion.
16 . The optical display assembly of claim 15 , wherein the plurality of light sources comprise a plurality of lamps arranged to run in a horizontal direction parallel to each other.
17 . An optical display assembly comprising:
a light provider comprising a plurality of light sources;
an optical diffuser sheet comprising:
a first surface having a plurality of optical structures arranged to diffuse and direct light illuminated onto the first surface from the light provider, wherein a shape and dimensions of each optical structure represents a random modulation of a corresponding idealized structure in a vertical direction; and
a second surface opposite to the first surface; and
an optical film arranged on the optical diffuser sheet adjacent to the first surface.
18 . The optical display assembly of claim 17 , further comprising:
a light recycling polarizer arranged above the optical film.
19 . An optical display assembly comprising:
a light provider comprising a plurality of light sources;
a first optical diffuser sheet comprising:
a first surface having a plurality of optical structures arranged to diffuse and direct light illuminated onto the first surface from the light provider; and
a second surface opposite to the first surface, and having a plurality of optical structures arranged to diffuse and direct light illuminated onto the second surface; and
a second optical diffuser sheet arranged above the first optical diffuser sheet comprising:
a third surface having a plurality of optical structures arranged to diffuse and direct light illuminated onto the third surface; and
a fourth surface opposite to the third surface.
20 . An optical display assembly comprising:
a light provider comprising a plurality of light sources;
an optical diffuser sheet comprising:
a first surface having a plurality of optical structures arranged to diffuse and direct light illuminated onto the first surface from the light provider; and
a second surface opposite to the first surface, and having a plurality of optical structures arranged to diffuse and direct light illuminated onto the second surface; and
a light collimating diffuser film arranged above the optical diffuser sheet.
21 . The optical display assembly of claim 20 , further comprising:
a light recycling polarizer arranged above the light collimating diffuser film.
22 . The optical display assembly of claim 20 , further comprising:
a second light collimating diffuser film arranged above the light collimating diffuser film.
23 . The optical display assembly of claim 22 , further comprising:
a third light collimating diffuser film arranged above the second light collimating diffuser film.
24 . The optical display assembly of claim 20 , further comprising:
a prism film arranged between the light collimating diffuser film and the optical diffuser sheet.
25 . The optical display assembly of claim 24 further comprising:
a second light collimating diffuser film arranged above the prism film.
26 . The optical display assembly of claim 20 , further comprising:
a prism film arranged above the light collimating diffuser film and the optical diffuser sheet.
27 . An optical display assembly comprising:
a light provider comprising a plurality of light sources;
an optical diffuser sheet comprising:
a first surface having a plurality of optical structures arranged to diffuse and direct light illuminated onto the first surface from the light provider; and
a second surface opposite to the first surface; and
a light collimating diffuser film arranged above the optical diffuser sheet.
28 . The optical display assembly of claim 27 , further comprising:
a second light collimating diffuser film arranged above the light collimating diffuser film.
29 . The optical display assembly of claim 28 , further comprising:
a third light collimating diffuser film arranged above the second light collimating diffuser film.
30 . The optical display assembly of claim 27 , further comprising:
a prism film arranged between the light collimating diffuser film and the optical diffuser sheet.
31 . The optical display assembly of claim 30 , further comprising:
a second light collimating diffuser film arranged above the prism film.
32 . The optical display assembly of claim 27 , further comprising:
a light recycling polarizer arranged above the light collimating diffuser film.
33 . The optical display assembly of claim 27 , further comprising:
a prism film arranged above the light collimating diffuser film and the optical diffuser sheet.