US 9,435,929 B2Granted

Back light module

AssigneeYoung Lighting Technology Inc.

InventorsMing-Dah Liu, Chin-Ming Lin, Sze-Ke Wang

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Abstract

A back light module includes a light guide plate, at least one first light source, at least one second light source and at least one first reflection element. The light guide plate includes a first light incident surface, a second light incident surface opposite to the first light incident surface, a light emitting surface, and a bottom surface opposite to the light emitting surface. The first light source is disposed beside the first light incident surface and suitable to provide a first non-collimated light beam to the first light incident surface. The second light source is disposed beside the second light incident surface and suitable to provide a first collimated light beam to the second light incident surface. The first reflection element is disposed beside the first light incident surface to reflect the first collimated light beam emitted so as to make the first collimated light beam diverge.

Claims25

Dependent claims

A back light module, comprising:

a light guide plate including a first light incident surface, a second light incident surface opposite to the first light incident surface, a light emitting surface, and a bottom surface opposite to the light emitting surface, wherein the light emitting surface connects the first light incident surface and the second light incident surface, and the bottom surface connects the first light incident surface and the second light incident surface;
at least one first light source disposed beside the first light incident surface, the first light source being suitable to provide a first non-collimated light beam to the first light incident surface;
at least one second light source disposed beside the second light incident surface, the second light source being suitable to provide a first collimated light beam to the second light incident surface;
and
at least one first reflection element disposed beside the first light incident surface, wherein the first reflection element is suitable to reflect the first collimated light beam emitted from the second light source so as to make the first collimated light beam diverge,
wherein the first reflection element is a convex micro mirror array.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/305,573Filed 16 Jun 2014
Priority: CN 2013 1 024718720 Jun 2013
Published: US 2014/0376261 A125 Dec 2014
Granted: 6 Sep 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G02B 6/0031
Provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source: reflecting…
G02B 6/003
Provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source: lens or…
G02B 6/0068
Characterised by the light source being coupled to the light guide: arrangements of plural sources, e.g. multi-colour light sources
G02B 6/0036
Provided on the surface of the light guide or in the bulk of it: 2-D arrangement of prisms, protrusions, indentations or roughened surfaces

Family

US 2014/0376261 A1Pre-grant publication · published 25 Dec 2014
US 9,435,929 B2This patent

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

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