US 8,147,111 B2Granted

Light guide plate and backlight module

AssigneeAu Optronics Corporation

InventorsChiung-Han Wang, Jing-Huan Liao, Yu-Tsung Huang

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Abstract

A light guide plate including a body and a plurality of prism microstructures is provided. The body has a bottom surface, a light emitting surface opposite to the bottom surface, and a plurality of side surfaces. The light emitting surface has a central area and at least one peripheral area outside the central area. The prism microstructures are disposed on the light emitting surface and the bottom surface. The prism microstructure disposed on the light emitting surface includes a plurality of first prism microstructures in the central area and a plurality of second prism microstructures in the peripheral area. A top angle θ2 of the second prism microstructure is greater than a top angle θ1 of the first prism microstructure. A backlight module including the above-mentioned light guide plate is also provided.

Claims48

Dependent claims

A light guide plate, comprising:

a body having a bottom surface, a light emitting surface opposite to the bottom surface, and a plurality of side surfaces connected between the bottom surface and the light emitting surface, wherein the light emitting surface has a central area and at least one peripheral area disposed thereon, and the peripheral area is located outside the central area;
and
a plurality of prism microstructures disposed on the light emitting surface and the bottom surface, wherein the prism microstructures on the light emitting surface comprise a plurality of first prism microstructures located in the central area and a plurality of second prism microstructures located in the peripheral area, and a top angle θ2 of each of the second prism microstructures is greater than a top angle θ1 of each of the first prism microstructures, wherein the prism microstructures on the light emitting surface comprise a plurality of triangular prisms arranged in parallel to each other, and the prism microstructures on the bottom surface comprise a plurality of triangular prisms arranged in parallel to each other, and relative to the bottom surface, each of the triangular prisms on the bottom surface has a first height corresponding to the central area and a second height corresponding to the peripheral area, and the second height is greater than the first height.

A backlight module, comprising:

a light guide plate, comprising:
a body having a bottom surface, a light emitting surface opposite to the bottom surface, and a plurality of side surfaces connected between the bottom surface and the light emitting surface, wherein the light emitting surface has a central area and at least one peripheral area disposed thereon, and the peripheral area is located outside the central area;
a plurality of prism microstructures disposed on the light emitting surface and the bottom surface, wherein the prism microstructures on the light emitting surface comprise a plurality of first prism microstructures located in the central area and a plurality of second prism microstructures located in the peripheral area, and a top angle θ2 of each of the second prism microstructures is greater than a top angle θ1 of each of the first prism microstructures, wherein the prism microstructures on the light emitting surface comprise a plurality of triangular prisms arranged in parallel to each other, and the prism microstructures on the bottom surface comprise a plurality of triangular prisms arranged in parallel to each other, and relative to the bottom surface, the triangular prisms on the bottom surface have a first height corresponding to the central area and a second height corresponding to the peripheral area, and the second height is greater than the first height;
and
a light source set located by at least one side surface of the body for emitting a light into the body via the at least one side surface.

2 more elements

A light guide plate, comprising:

a body having a bottom surface, a light emitting surface opposite to the bottom surface, and a plurality of side surfaces connected between the bottom surface and the light emitting surface, wherein the light emitting surface has a central area and at least one peripheral area disposed thereon, and the peripheral area is located outside the central area;
and
a plurality of prism microstructures disposed on the light emitting surface and the bottom surface, wherein the prism microstructures on the light emitting surface comprise a plurality of first prism microstructures located in the central area and a plurality of second prism microstructures located in the peripheral area, and a top angle θ2 of each of the second prism microstructures is greater than a top angle θ1 of each of the first prism microstructures, wherein the prism microstructures on the light emitting surface comprise a plurality of triangular prisms arranged in parallel to each other, the prism microstructures on the bottom surface comprise a plurality of V-shaped trenches arranged in parallel to each other, and, relative to the bottom surface, each of the V-shaped trenches on the bottom surface has a first depth corresponding to the central area and a second depth corresponding to the peripheral area, and the second depth is greater than the first depth.

A backlight module, comprising:

a light guide plate, comprising:
a body having a bottom surface, a light emitting surface opposite to the bottom surface, and a plurality of side surfaces connected between the bottom surface and the light emitting surface, wherein the light emitting surface has a central area and at least one peripheral area disposed thereon, and the peripheral area is located outside the central area;
a plurality of prism microstructures disposed on the light emitting surface and the bottom surface, wherein the prism microstructures on the light emitting surface comprise a plurality of first prism microstructures located in the central area and a plurality of second prism microstructures located in the peripheral area, and a top angle θ2 of each of the second prism microstructures is greater than a top angle θ1 of each of the first prism microstructures, wherein the prism microstructures on the light emitting surface comprise a plurality of triangular prisms arranged in parallel to each other, the prism microstructures on the bottom surface comprise a plurality of V-shaped trenches arranged in parallel to each other, and relative to the bottom surface, the V-shaped trenches on the bottom surface have a first depth corresponding to the central area and a second depth corresponding to the peripheral area, and the second depth is greater than the first depth;
and
a light source set located by at least one side surface of the body for emitting a light into the body via the at least one side surface.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/421,654Filed 10 Apr 2009
Priority: TW 97145560 A25 Nov 2008
Published: US 2010/0128495 A127 May 2010
Granted: 3 Apr 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G02B 6/0038
Provided on the surface of the light guide or in the bulk of it: linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves,…
G02B 6/0046
By shaping at least a portion of the light guide: tapered light guide, e.g. wedge-shaped light guide
G02B
Optical elements, systems or apparatus

Family

US 2010/0128495 A1Pre-grant publication · published 27 May 2010
US 8,147,111 B2This patent

From the US filing history. Foreign family members aren’t listed.

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