OPTICAL FILM
An optical film includes a number of phosphor layers. The phosphor layers are stacked together, and each of the phosphor layers is excited by an exciting light source and respectively emits a secondary light beam. The secondary light beams emitted by the phosphor layers are in different wavelength ranges.
1 . An optical film, comprising:
a plurality of phosphor layers stacked together, wherein each of the phosphor layers is excited by an exciting light source and respectively emits a secondary light beam, and the secondary light beams emitted by the phosphor layers are in different wavelength ranges.
2 . The optical film as claimed in claim 1 , further comprising a first substrate on which the phosphor layers are stacked.
3 . The optical film as claimed in claim 1 , wherein a wavelength of the exciting light source is shorter than a wavelength of each of the secondary light beams.
4 . The optical film as claimed in claim 2 , wherein the first substrate is a transparent substrate.
5 . The optical film as claimed in claim 2 , wherein the first substrate is a reflective substrate.
6 . The optical film as claimed in claim 1 , wherein the phosphor layers comprise at least two of a red phosphor layer, a green phosphor layer, and a yellow phosphor layer.
7 . The optical film as claimed in claim 2 , wherein one of the phosphor layers located bottommost entirely covers a surface of the first substrate.
8 . The optical film as claimed in claim 2 , further comprising a second substrate, wherein the second substrate covers one of the phosphor layers located topmost, such that the phosphor layers are interposed between the first substrate and the second substrate.
9 . The optical film as claimed in claim 8 , wherein the first substrate is a transparent substrate, and the second substrate is a transparent substrate or a reflective substrate.
10 . The optical film as claimed in claim 8 , wherein the first substrate is a reflective substrate, and the second substrate is a transparent substrate.
11 . The optical film as claimed in claim 1 , wherein the optical film is capable of peeling off or separating from an object.
12 . An optical film, comprising:
a plurality of patterned phosphor layers arranged in array, wherein each of the patterned phosphor layers is excited by an exciting light source and respectively emits a secondary light beam, and the secondary light beams emitted by the patterned phosphor layers are in different wavelength ranges.
13 . The optical film as claimed in claim 12 , further comprising a first substrate on which the patterned phosphor layers are stacked.
14 . The optical film as claimed in claim 12 , wherein a wavelength of the exciting light source is shorter than a wavelength of each of the secondary light beams.
15 . The optical film as claimed in claim 13 , wherein the first substrate is a transparent substrate.
16 . The optical film as claimed in claim 13 , wherein the first substrate is a reflective substrate.
17 . The optical film as claimed in claim 12 , wherein the patterned phosphor layers comprise at least two of a patterned red phosphor layer, a patterned green phosphor layer, and a patterned yellow phosphor layer.
18 . The optical film as claimed in claim 13 , wherein the patterned phosphor layers cover different regions on a surface of the first substrate, and the patterned phosphor layers entirely cover the surface of the first substrate.
19 . The optical film as claimed in claim 13 , further comprising a second substrate, wherein the second substrate covers the patterned phosphor layers, such that the patterned phosphor layers are interposed between the first substrate and the second substrate.
20 . The optical film as claimed in claim 19 , wherein the first substrate is a transparent substrate, and the second substrate is a transparent substrate or a reflective substrate.
21 . The optical film as claimed in claim 19 , wherein the first substrate is a reflective substrate, and the second substrate is a transparent substrate.
22 . The optical film as claimed in claim 12 , wherein the patterned phosphor layers have a matrix arrangement.
23 . The optical film as claimed in claim 12 , wherein the patterned phosphor layers have a delta arrangement.
24 . The optical film as claimed in claim 12 , wherein the patterned phosphor layers have a honeycomb arrangement.
25 . The optical film as claimed in claim 12 , wherein the optical film is capable of peeling off or separating from an object.