Light-modulating unit and display device using the same
A light-modulating unit is provided. The light-modulating unit includes a light-modulating structure that has a light-emitting surface and a bottom surface that are opposite to each other. The light-modulating structure includes a housing cavity that extends from the bottom surface into the interior of the light-modulating structure. The light-modulating unit also includes a light-emitting element disposed in the housing cavity. The light-modulating unit further includes a light-reflecting array structure disposed on the light-emitting surface and directly above the light-emitting element. The light-reflecting array structure includes multiple grooves that form an m×n array, where m and n are positive integers greater than or equal to 2.
1 . A light-modulating unit, comprising:
a light-modulating structure having a light-emitting surface and a bottom surface that are opposite to each other, wherein the light-modulating structure comprises a housing cavity that extends from the bottom surface into an interior of the light-modulating structure;
a light-emitting element disposed in the housing cavity; and
a light-reflecting array structure disposed on the light-emitting surface and directly above the light-emitting element, wherein the light-reflecting array structure comprises grooves that form an m×n array, and m and n are positive integers greater than or equal to 2, wherein in a cross-sectional view, each of the grooves has a first included angle, and the first included angle is less than 120 degrees, and wherein the grooves comprise a plurality of first sub-grooves and a plurality of second sub-grooves, the second sub-grooves surround the first sub-grooves, and the first included angle of each of the first sub-grooves is less than the first included angle of each of the second sub-grooves.
2 . The light-modulating unit as claimed in claim 1 , wherein in a top view, an area of the light-reflecting array structure is greater than or equal to an area of the light-emitting element and less than an area of the light-emitting surface of the light-modulating structure.
3 . The light-modulating unit as claimed in claim 1 , wherein the light-reflecting array structure further comprises a reflective layer that is coated on at least part of surfaces of the grooves.
4 . The light-modulating unit as claimed in claim 1 , wherein the light-reflecting array structure further comprises a reflective layer that is partially filled or completely fills the grooves.
5 . The light-modulating unit as claimed in claim 1 , wherein there are microstructures on sidewalls of the housing cavity, and the microstructures comprise triangular prism structures or dots.
6 . The light-modulating unit as claimed in claim 5 , wherein in a bottom view, each of the triangular prism structures has a second included angle, and the second included angle is greater than 30 degrees.
7 . The light-modulating unit as claimed in claim 1 , further comprising: a plurality of first light-guiding dots disposed on the light-emitting surface of the light-modulating structure and surrounding the light-reflecting array structure.
8 . The light-modulating unit as claimed in claim 7 , wherein in a top view, the first light-guiding dots are arranged from sparse to dense in a direction away from the light-reflecting array structure.
9 . The light-modulating unit as claimed in claim 7 , wherein in a top view, sizes of the first light-guiding dots increase in a direction away from the light-reflecting array structure.
10 . The light-modulating unit as claimed in claim 1 , further comprising: a plurality of second light-guiding dots disposed on the bottom surface of the light-modulating structure and surrounding the housing cavity.
11 . The light-modulating unit as claimed in claim 10 , wherein in a bottom view, the second light-guiding dots are arranged from sparse to dense in a direction away from the housing cavity.
12 . The light-modulating unit as claimed in claim 10 , wherein in a bottom view, sizes of the second light-guiding dots increases in a direction away from the housing cavity.
13 . The light-modulating unit as claimed in claim 1 , wherein in a top view, a shape of the light-modulating structure is rectangular.
14 . A display device, comprising:
a display panel;
a backlight module disposed on a back side of the display panel, wherein the backlight module comprises a substrate having a plurality of light-modulating zones, and each of the light-modulating zones comprises the light-modulating unit as claimed in claim 1 ; and
a plurality of driving devices disposed on the substrate and driving a corresponding light-modulating unit of each of the light-modulating zones.