Backlight module with reflective diffuser and liquid crystal display with same
An exemplary backlight module includes a first light source, and a diffusing film. The diffusing film includes a light incident surface adjacent to the first light source, a light emitting surface located at an opposite side thereof, and a plurality of first reflective portions provided at the light incident surface. A pitch between every two adjacent first reflective portions progressively increases with increasing distance away from the first light source. A liquid crystal display employing the backlight module is also provided.
1 . A backlight module comprising:
a first light source; and
a diffusing film comprising:
a light incident surface adjacent to the first light source;
a light emitting surface located at an opposite side thereof; and
a plurality of first reflective portions provided at the light incident surface, a pitch between every two adjacent first reflective portions increasing with increasing distance away from the first light source.
2 . The backlight module of claim 1 , further comprising a second light source, wherein the first and second light sources are located at two opposite sides of the light incident surface of the diffusing film.
3 . The backlight module of claim 2 , further comprising a plurality of second reflective portions provided at the light incident surface, wherein a pitch between every two adjacent second reflective portions increases with increasing distance away from the second light source.
4 . The backlight module of claim 3 , wherein the first and second reflective portions are substantially parallel to each other.
5 . The backlight module of claim 1 , wherein the first reflective portions are separate from each other, and are substantially parallel to the first light source.
6 . The backlight module of claim 3 , wherein the second reflective portions are separate from each other, and are substantially parallel to the second light source.
7 . The backlight module of claim 1 , further comprising a second light source, wherein the first and second light sources are located at two adjacent sides of the light incident surface of the diffusing film.
8 . The backlight module of claim 7 , further comprising a plurality of second reflective portions provided at the light incident surface, wherein a pitch between every two adjacent second reflective portions increases with increasing distance away from the second light source.
9 . The backlight module of claim 8 , wherein the first reflective portions are substantially parallel to the first light source, and the second reflective portions are substantially parallel to the second light source.
10 . A backlight module comprising:
a first light source; and
a diffusing film comprising:
a first surface adjacent to the first light source;
a second surface located at an opposite side thereof; and
a plurality of first reflective portions provided at the first surface, a pitch between every two adjacent first reflective portions increasing with increasing distance away from the first light source.
11 . The backlight module of claim 10 , further comprising a second light source, wherein the first and second light sources are located at two opposite sides of the first surface of the diffusing film.
12 . The backlight module of claim 11 , further comprising a plurality of second reflective portions provided at the first surface, wherein a pitch between every two adjacent second reflective portions increases with increasing distance away from the second light source.
13 . The backlight module of claim 12 , wherein the first and second reflective portions are substantially parallel to each other.
14 . The backlight module of claim 10 , wherein the first reflective portions are separate from each other, and are substantially parallel to the first light source.
15 . The backlight module of claim 12 , wherein the second reflective portions are separate from each other, and are substantially parallel to the second light source.
16 . The backlight module of claim 10 , further comprising a second light source, wherein the first and second light sources are located at two adjacent sides of the first surface of the diffusing film.
17 . The backlight module of claim 16 , further comprising a plurality of second reflective portions provided at the first surface, wherein a pitch between every two adjacent second reflective portions increases with increasing distance away from the second light source.
18 . The backlight module of claim 17 , wherein the first reflective portions are substantially parallel to the first light source, and the second reflective portions are substantially parallel to the second light source.
19 . The backlight module of claim 10 , further comprising a reflective film located opposite to the first surface of the diff-using film.
20 . A liquid crystal display comprising:
a liquid crystal panel; and
a backlight module capable of illuminating the liquid crystal panel, the backlight module comprising:
a light source; and
a diffusing film comprising:
a light incident surface adjacent to the light source;
a light emitting surface located at an opposite side thereof; and
a plurality of reflective portions provided at the light incident surface, a pitch between every two adjacent reflective portions progressively increasing with increasing distance away from the corresponding light source.