Light diffusion device, backlight module and liquid crystal display
AssigneeAu Optronics Corporation
InventorsMing-Lung Chen, Chun-Chang Hung, Tai-Hao Chang, Hsiu-Mei Fang, Chiu-Chun Chen
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Abstract
A light diffusion device including a light incident surface and a light exit surface is provided. The light exit surface has at least one light scattering pattern. A trajectory of the light scattering pattern is a continuous curve. The continuous curve is winded to form a plurality of closed patterns in sequence on the light exit surface, and two adjacent closed patterns at least overlap partly.
Claims11
A light diffusion device, having a light incident surface and a light exit surface, wherein the light exit surface has at least one light scattering pattern, a trajectory of the light scattering pattern is a continuous curve, the continuous curve is shaped in a combination of arcs and winded to form a plurality of closed patterns in sequence on the light exit surface, each of the closed patterns is in tangent to at least one of the other closed patterns at a tangent point to form a rice-like structure between two adjacent tangent points, and two adjacent closed patterns overlap partly, the closed patterns are arranged in sequence along a direction, and each closed pattern is displaced by a fixed distance D with respect to a preceding closed pattern in the direction, a maximum width of each closed pattern along the direction is W, and D<W, W/D is an integer, and wherein the at least one light scattering pattern is a plurality of light scattering patterns arranged side by side, and a distance between two adjacent light scattering patterns is d, where 0 μm<d≦100 μm.
A backlight module, comprising:
- a light diffusion device, having a light incident surface and a light exit surface, wherein the light exit surface has at least one light scattering pattern, a trajectory of the light scattering pattern is a continuous curve, the continuous curve is shaped in a combination of arcs and winded to form a plurality of closed patterns in sequence on the light exit surface, each of the closed patterns is in tangent to at least one of the other closed patterns at a tangent point to form a rice-like structure between two adjacent tangent points, and two adjacent closed patterns overlap partly, the closed patterns are arranged in sequence along a direction, and each closed pattern is displaced by a fixed distance D with respect to a preceding closed pattern in the direction, a maximum width of each closed pattern along the direction is W, and D<W, W/D is an integer, and wherein the at least one light scattering pattern is a plurality of light scattering patterns arranged side by side, and a distance between two adjacent light scattering patterns is d, where 0 μm<d≦100 μm;
- and
- a light source, providing light rays that enter the light diffusion device through the light incident surface, and exit from the light exit surface of the light diffusion device.
A liquid crystal display, comprising:
- a backlight module, comprising:
- a light diffusion device, having a light incident surface and a light exit surface, wherein the light exit surface has at least one light scattering pattern, a trajectory of the light scattering pattern is a continuous curve, the continuous curve is shaped in a combination of arcs and winded to form a plurality of closed patterns in sequence on the light exit surface, each of the closed patterns is in tangent to at least one of the other closed patterns at a tangent point to form a rice-like structure between two adjacent tangent points, and two adjacent closed patterns overlap partly, the closed patterns are arranged in sequence along a direction, and each closed pattern is displaced by a fixed distance D with respect to a preceding closed pattern in the direction, a maximum width of each closed pattern along the direction is W, and D<W, W/D is an integer, and wherein the at least one light scattering pattern is a plurality of light scattering patterns arranged side by side, and a distance between two adjacent light scattering patterns is d, where 0 μm<d≦100 μm;
- and
- a light source, providing light rays that enter the light diffusion device through the light incident surface, and exit from the light exit surface of the light diffusion device;
- and
- an LCD panel, disposed beside the light exit surface of the light diffusion device.
Dependencies are inferred from the claim text.