US 8,944,663 B2Granted

Light guide plate and backlight module having V-cut structure

AssigneeAu Optronics Corporation

InventorsChiung-Han Wang, Jing-Huan Liao

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Abstract

A light guide plate having a V-cut structure and a backlight module are disclosed. The light guide plate comprises straight-striped V-cut structure sets and a base plate having a light-entering side. The straight-striped V-cut structure sets are formed on a surface of the base plate adjacent to the light-entering side, wherein each straight-striped V-cut structure set is composed of at least one V-cut element, each V-cut element having a first base angle and a second base angle formed between its respective two inclined surfaces and a horizontal surface of the base plate. The first base angle is located closer to the light-entering side than the second base angle is, and is smaller than or equal to the second base angle. The straight-striped V-cut structure sets have a plurality of second average angle values which are gradually decreased from the light-entering side to a central position of the base plate.

Claims38

Dependent claims

A light guide plate having a V-cut structure, comprising:

a base plate having a first side and a second side opposite to the first side, wherein the first side is a first light-entering side;
and
a plurality of straight-striped V-cut structure sets directly formed on a surface of the base plate adjacent to the first side, wherein each of the straight-striped V-cut structure sets is composed of at least one V-cut element;
each of the at least one V-cut element having a first base angle and a second base angle formed between its respective two inclined surfaces and a horizontal surface of the base plate, wherein the first base angle is located closer to the first side than the second base angle is, and the first base angle is smaller than or equal to the second base angle;
and
each of the straight-striped V-cut structure sets having a first average angle value and a second average angle value, wherein the first average angle value is an averaged value of the at least one first base angle in the each of the straight-striped V-cut structure sets, and the second average angle value is an averaged value of the at least one second base angle in the each of the straight-striped V-cut structure sets, and the second average angle values of the straight-striped V-cut structure sets are gradually decreased from the first side to a central position of the base plate,
wherein when the first side is the only one light-entering side of the light guide plate, the first average angle values of the straight-striped V-cut structure sets are the same, and the second average angle values of the straight-striped V-cut structure sets are gradually decreased from the central position to the second side.

4 more elements

A light guide plate having a V-cut structure, comprising:

a base plate having a first side and a second side opposite to the first side, wherein the first side is a first light-entering side;
and
a plurality of straight-striped V-cut structure sets directly formed on a surface of the base plate adjacent to the first side, wherein each of the straight-striped V-cut structure sets is composed of at least one V-cut element;
each of the at least one V-cut element having a first base angle and a second base angle formed between its respective two inclined surfaces and a horizontal surface of the base plate, wherein the first base angle is located closer to the first side than the second base angle is, and the first base angle is smaller than or equal to the second base angle;
and
each of the straight-striped V-cut structure sets having a first average angle value, a second average angle value and a smaller average angle value, wherein the first average angle value is an averaged value of the at least one first base angle in the each of the straight-striped V-cut structure sets, and the second average angle value is an averaged value of the at least one second base angle in the each of the straight-striped V-cut structure sets, and the smaller average angle value is the minimum value between the first average angle and the second average angle, the straight-striped V-cut structure sets comprising:
a first V-cut structure set parallel to the first side;
and
a second V-cut structure set located between the first side and the first V-cut structure set, wherein the smaller average angle value of the first V-cut structure set is less than the smaller average angle value of the second V-cut structure set.

6 more elements

A light guide plate having a V-cut structure, comprising:

a base plate having a first side and a second side opposite to the first side, wherein the first side is a first light-entering side;
and
a plurality of straight-striped V-cut structure sets directly formed on a surface of the base plate adjacent to the first side, wherein each of the straight-striped V-cut structure sets is composed of at least one V-cut element;
each of the at least one V-cut element having a first base angle and a second base angle formed between its respective two inclined surfaces and a horizontal surface of the base plate, wherein the first base angle is located closer to the first side than the second base angle is;
and
each of the straight-striped V-cut structure sets having a first average angle value, a second average angle value and a larger average angle value, wherein the first average angle value is an averaged value of the at least one first base angle in the each of the straight-striped V-cut structure sets, and the second average angle value is an averaged value of the at least one second base angle in the each of the straight-striped V-cut structure sets, and the larger average angle value is the maximum value between the first average angle and the second average angle, the straight-striped V-cut structure sets comprising:
a first V-cut structure set parallel to the first side;
and
a second V-cut structure set located between the first side and the first V-cut structure set, wherein the larger average angle value of the first V-cut structure set is less than the larger average angle value of the second V-cut structure set;
a third V-cut structure set, wherein the first V-cut structure set is located between the third V-cut structure set and the second V-cut structure set, and the larger average angle value of the first V-cut structure set is less than the smaller average angle value of the third V-cut structure set.

7 more elements

A backlight module, comprising:

a light guide plate having a V-cut structure comprising:
a base plate having a first side and a second side opposite to the first side, wherein the first side is a first light-entering side;
and
a plurality of straight-striped V-cut structure sets directly formed on a surface of the base plate adjacent to the first side, wherein each of the straight-striped V-cut structure sets is composed of at least one V-cut element;
each of the at least one V-cut element having a first base angle and a second base angle formed between its respective two inclined surfaces and a horizontal surface of the base plate, wherein the first base angle is located closer to the first side than the second base angle is, and the first base angle is smaller than or equal to the second base angle;
and
each of the straight-striped V-cut structure sets having a first average angle value and a second average angle value, wherein the first average angle value is an averaged value of the at least one first base angle in the each of the straight-striped V-cut structure sets, and the second average angle value is an averaged value of the at least one second base angle in the each of the straight-striped V-cut structure sets, and the second average angle values of the straight-striped V-cut structure sets are gradually decreased from the first side to a central position of the base plate,
wherein when the first side is the only one light-entering side of the light guide plate, the first average angle values of the straight-striped V-cut structure sets are the same, and the second average angle values of the straight-striped V-cut structure sets are gradually decreased from the central position to the second side;
an optical film disposed above a light-emitting surface of the light guide plate;
and
a first light source disposed adjacent to the first side of the light guide plate.

8 more elements

A light guide plate having a V-cut structure, comprising:

a base plate having a first side and a second side opposite to the first side, wherein the first side is a first light-entering side;
and
a plurality of straight-striped V-cut structure sets directly formed on a surface of the base plate adjacent to the first side, wherein each of the straight-striped V-cut structure sets is composed of at least one V-cut element;
each of the at least one V-cut element having a first base angle and a second base angle formed between its respective two inclined surfaces and a horizontal surface of the base plate, wherein the first base angle is located closer to the first side than the second base angle is, and the first base angle is smaller than or equal to the second base angle;
and
each of the straight-striped V-cut structure sets having a first average angle value and a second average angle value, wherein the first average angle value is an averaged value of the at least one first base angle in the each of the straight-striped V-cut structure sets, and the second average angle value is an averaged value of the at least one second base angle in the each of the straight-striped V-cut structure sets, and the second average angle values of the straight-striped V-cut structure sets are gradually decreased from the first side to a central position of the base plate,
wherein, when the first side is the only one light-entering side of the light guide plate, the first average angle values of the straight-striped V-cut structure sets are the same from the first side to the central position and then are gradually decreased from the central position to the second side;
and the second average angle values of the straight-striped V-cut structure sets are gradually increased from the central position to the second side.

5 more elements

A backlight module, comprising:

a light guide plate having a V-cut structure comprising:
a base plate having a first side and a second side opposite to the first side, wherein the first side is a first light-entering side;
and
a plurality of straight-striped V-cut structure sets directly formed on a surface of the base plate adjacent to the first side, wherein each of the straight-striped V-cut structure sets is composed of at least one V-cut element;
each of the at least one V-cut element having a first base angle and a second base angle formed between its respective two inclined surfaces and a horizontal surface of the base plate, wherein the first base angle is located closer to the first side than the second base angle is, and the first base angle is smaller than or equal to the second base angle;
and
each of the straight-striped V-cut structure sets having a first average angle value and a second average angle value, wherein the first average angle value is an averaged value of the at least one first base angle in the each of the straight-striped V-cut structure sets, and the second average angle value is an averaged value of the at least one second base angle in the each of the straight-striped V-cut structure sets, and the second average angle values of the straight-striped V-cut structure sets are gradually decreased from the first side to a central position of the base plate,
wherein, when the first side is the only one light-entering side of the light guide plate, the first average angle values of the straight-striped V-cut structure sets are the same from the first side to the central position and then are gradually decreased from the central position to the second side;
and the second average angle values of the straight-striped V-cut structure sets are gradually increased from the central position to the second side;
an optical film disposed above a light-emitting surface of the light guide plate;
and
a first light source disposed adjacent to the first side of the light guide plate.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/492,354Filed 26 Jun 2009
Priority: TW 98102546 A22 Jan 2009
Published: US 2010/0182802 A122 Jul 2010
Granted: 3 Feb 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 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 6/0053
Provided by one optical element, or plurality thereof, placed on the light output side of the light guide: prismatic sheet or layer; Brightness…
G02B 6/0051
Provided by one optical element, or plurality thereof, placed on the light output side of the light guide: diffusing sheet or layer
G02B
Optical elements, systems or apparatus