CN102434824A

CN102434824A - Backlight module

Info

Publication number: CN102434824A
Application number: CN2011103594277A
Authority: CN
Inventors: 赵永贵
Original assignee: AU Optronics Suzhou Corp Ltd; AU Optronics Corp
Current assignee: AU Optronics Suzhou Corp Ltd; AU Optronics Corp
Priority date: 2011-11-09
Filing date: 2011-11-09
Publication date: 2012-05-02

Abstract

A backlight module includes: light guide plate, circuit board, a plurality of light sources, frame and blooming. The light guide plate is provided with a light incident surface and a light emergent surface, the light incident surface is positioned on one side of the light guide plate and is symmetrically formed by two first inclined surfaces, and the two first inclined surfaces are connected with each other to form an included angle. The circuit board corresponds to the light incident surface of the light guide plate, and the light sources on the two second inclined surfaces are arranged in a staggered mode. The plurality of light sources are arranged on the second inclined plane of the circuit board and correspond to the first inclined plane. The outer frame is provided with a plurality of bends to form an accommodating space which is matched with the light guide plate to accommodate the circuit board, the light source and the light guide plate. The optical film is arranged on the light-emitting surface of the light guide plate and is contained in the outer frame. The invention can reduce the weight of the backlight module, make the emitted light more uniform, and can make the light source and the light guide plate better align.

Description

Backlight module

Technical Field

The present disclosure relates to backlight modules, and particularly to a backlight module with an optical element.

Background

A backlight Unit (BLU) is one of the key components of a liquid crystal display panel, and functions to provide a Light source with sufficient brightness and uniform distribution so that the liquid crystal display can normally display images. In order to display high-quality pictures, especially for the birth of tablet computers, higher requirements are placed on the brightness of the backlight module. The backlight unit (BLU) can be classified into a vertical type and a side type. Currently, in the side type backlight module, the number of Light Emitting Diodes (LEDs) is increased or light is incident from both sides of the light guide plate to achieve high brightness, but these methods may limit the optical performance or increase the thickness of the backlight module (BLU). In another method, three-color light bars are disposed on the light incident side of the light guide plate, and are controlled by independent circuit boards, and the three-color light sources can be arranged in parallel in the same light incident direction, so that the light mixing is not uniform.

In view of the above, an urgent need exists in the art to provide a backlight unit (BLU) that can increase the incident area, increase the light condensing efficiency, and make the light emitted uniform without increasing the weight of the BLU.

Disclosure of Invention

The invention provides a backlight module aiming at the defects that the backlight module (BLU) in the prior art is thick, the light emitting is not uniform, and the light source and the light guide plate are not easy to align.

According to the present invention, there is provided a backlight module comprising: light guide plate, circuit board, a plurality of light sources, frame and blooming. The light guide plate is provided with a light incident surface and a light emergent surface, the light incident surface is positioned on one side of the light guide plate and is symmetrically formed by two first inclined surfaces, and the two first inclined surfaces are connected with each other to form an included angle. The circuit board corresponds to the light incident surface of the light guide plate, and the light sources on the two second inclined surfaces are arranged in a staggered mode. The plurality of light sources are arranged on the second inclined plane of the circuit board and correspond to the first inclined plane. The outer frame is provided with a plurality of bends to form an accommodating space which is matched with the light guide plate to accommodate the circuit board, the light source and the light guide plate. The optical film is arranged on the light-emitting surface of the light guide plate and is contained in the outer frame.

Preferably, the included angle is a right angle.

Preferably, the included angle is an acute angle.

Preferably, the circuit board further includes a plane connecting the two second inclined planes and corresponding to a common side of the two first inclined planes.

Preferably, the circuit board is a flexible printed circuit board.

Preferably, the circuit board and the outer frame are attached by a double-sided adhesive tape.

Preferably, the plurality of light sources is a plurality of LEDs.

Preferably, the light-emitting surface of the light guide plate is a flat surface.

Preferably, the light-emitting surface of the light guide plate has a recess, and the optical film is located in the recess.

The invention has the advantages that: one side of the light guide plate is designed to be a triangular structure to increase the incident area, so that the weight of the backlight module can be reduced. In addition, only one circuit board is used for driving, the light sources are arranged in a staggered mode, emitted light can be more uniform, and meanwhile the light sources and the light guide plate can be well aligned due to the fact that the light sources are arranged in a matched mode.

Drawings

The various aspects of the present invention will become more apparent to the reader after reading the detailed description of the invention with reference to the attached drawings. Wherein,

fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the invention.

Fig. 2 is a schematic structural diagram of a backlight module according to another embodiment of the invention.

Detailed Description

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the invention. Referring to fig. 1, the backlight assembly 1 includes: light guide plate 10, circuit board 11, multiple light sources 12, outer frame 13 and optical film 14. The light guide plate 10 has a light incident surface 101 and a light emitting surface 102, the light incident surface 101 is located on one side of the light guide plate 10 and is symmetrically formed by two first inclined surfaces 103, and the two first inclined surfaces 103 are connected to form an included angle θ. The light emitting surface 102 is a flat surface. The circuit board 11 corresponds to the light incident surface 101 of the light guide plate 10, and has two second inclined surfaces 111 corresponding to the first inclined surfaces 103, in this embodiment, the two second inclined surfaces 111 are connected by a plane 112, and the plane 112 corresponds to the common side edge 104 of the two first inclined surfaces 103. The two second inclined planes 111 of the circuit board 11 are respectively provided with a plurality of light sources 12, here, LEDs, and the light sources 12 on one second inclined plane 111 are staggered with the light sources 12 on the other second inclined plane 111. Since the light sources 12 are located on the same circuit board 11, a driving capacitor can be maintained, and the light transmitted through the light guide plate 10 is more uniform due to the staggered arrangement. In this embodiment, the circuit board 11 is a flexible printed circuit board. The outer frame 13 has a plurality of bending portions to form a receiving space (not shown) to be matched with the light guide plate 10, so as to receive the light guide plate 10, the circuit board 11 and the light source 12. The outer frame 13 and the circuit board 11 are attached by double-sided adhesive tape. The optical film 14 is located on the light emitting surface 102 of the light guide plate 10 and is contained in the outer frame 13. Because the outer frame 13 is bent to form a receiving space matched with the light guide plate 10, the thickness of the whole backlight module 1 is thinner on the basis of increasing the number of light sources, which is more beneficial to the competition of thinning the liquid crystal panel.

FIG. 2 is a schematic diagram illustrating a structure of a backlight module according to an embodiment of the invention. Referring to fig. 2, as in the embodiment shown in fig. 1, the backlight module 1 includes: light guide plate 10, circuit board 11, multiple light sources 12, outer frame 13 and optical film 14. In the backlight module 1, the light-emitting surface 102 of the light guide plate 10 has a recess 105, and the optical film 14 is located in the recess 105. Accordingly, the frame 13 is matched with the light guide plate 10 to cover the light guide plate 10, the circuit board 11 and the optical film 14. With such a design, the thickness of the backlight module 1 can be further reduced.

Hereinbefore, specific embodiments of the present invention are described with reference to the drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present invention without departing from the spirit and scope of the invention. Such modifications and substitutions are intended to be included within the scope of the present invention as defined by the appended claims.

Claims

1. A backlight module, comprising:

the light guide plate is provided with a light incident surface and a light emergent surface, the light incident surface is positioned on one side of the light guide plate and is symmetrically formed by two first inclined surfaces, and the two first inclined surfaces are connected with each other to form an included angle;

the circuit board corresponds to the light incident surface of the light guide plate and is provided with two second inclined surfaces corresponding to the first inclined surfaces;

the light sources are arranged on the second inclined planes of the circuit board, and the light sources on the two second inclined planes are arranged in a staggered mode;

the outer frame is provided with a plurality of bent parts to form an accommodating space which is matched with the light guide plate to accommodate the circuit board, the light source and the light guide plate; and

and the optical film is arranged on the light-emitting surface of the light guide plate and is contained in the outer frame.

2. The backlight module as claimed in claim 1, wherein the included angle is a right angle.

3. The backlight module of claim 1, wherein the included angle is an acute angle.

4. The backlight module as claimed in claim 1, wherein the circuit board further comprises a plane connecting the two second inclined planes and corresponding to a common edge of the two first inclined planes.

5. The backlight module of claim 1, wherein the circuit board is a flexible printed circuit board.

6. The backlight module as claimed in claim 1, wherein the circuit board is attached to the outer frame by a double-sided tape.

7. The backlight module of claim 1, wherein the plurality of light sources are a plurality of LEDs.

8. The backlight module according to any one of claims 1-7, wherein the light-emitting surface of the light guide plate is a flat surface.

9. The backlight module according to any one of claims 1-7, wherein the light-emitting surface of the light guide plate has a recess, and the optical film is disposed in the recess.