CN103899978A

CN103899978A - Backlight module

Info

Publication number: CN103899978A
Application number: CN201210569317.8A
Authority: CN
Inventors: 陈柏洲
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2012-12-25
Filing date: 2012-12-25
Publication date: 2014-07-02
Anticipated expiration: 2032-12-25
Also published as: CN103899978B

Abstract

A backlight module comprises a light guide plate and a plurality of light-emitting diode light sources arranged in the side direction of the light guide plate. The light guide plate is provided with a first portion attached to the light-emitting diode light sources and a second portion which is far away from the light-emitting diode light sources and is connected with the first portion. The refractive index of the first portion is unequal to that of the second portion. A microstructure is arranged on one side, close to the second portion, of the first portion and enables the light exiting angle of light shining on the microstructure from each light-emitting diode light source to become large.

Description

Backlight module

Technical field

The present invention relates to a kind of backlight module, relate in particular to a kind of utilization rate and luminous uniform backlight module that improves light.

Background technology

Than traditional light emitting source, the advantage such as that light emitting diode (Light Emitting Diode, LED) has is lightweight, volume is little, it is low to pollute, the life-span is long, it is applied in the middle of each field more and more as a kind of novel light emitting source.

But the backlight module of liquid crystal panel generally includes a LGP and and is arranged on some LED sources of this LGP one side.If in the time that this LGP arranges rough micro-structural towards a side of these some LED sources, so can make the dispersion angle of LED source become large, the light that these some LED sources are sent is more even, but produce gap between these some LED sources and this LGP, make some light of both sides cannot enter into this LGP and produce light leakage phenomena, reduced the utilization rate of light; If when this LGP is plane towards a side of these some LED sources, these some LED sources can be close to this LGP, so can make the rising angle of LED source less, light that these some LED sources are sent is inhomogeneous and easily cause the phenomenon of bright dark inequality.

Summary of the invention

Given this, the present invention aims to provide a kind of utilization rate and luminous uniform backlight module that improves light.

A kind of backlight module, comprise a LGP and some LED sources of being located at this LGP side direction, this LGP has and attaches the Part I of these some LED sources and away from these some LED sources and the Part II that joins with this Part I, and the refractive index of this Part I and the refractive index of this Part II are unequal, this Part I is provided with micro-structural in the side near this Part II, and the rising angle that this micro-structural makes each LED source inject the light on it becomes large.

The present invention is by providing a LGP, this LGP comprises that one is close to the Part I of some LED sources and away from these some LED sources and the Part II that joins with this Part I, because these some LED sources are closely arranged on this Part I, therefore avoided producing gap between these some LED sources and this LGP, make the light originally exposing from gap location inject the inside of this LGP, improved the utilization rate of light; In addition, be formed with a micro-structural at this Part I near a side of Part II, this micro-structural can make the rising angle of LED source increase, thereby light mixing distance is shortened, and the light that these some LED sources send is more even.

Brief description of the drawings

The top view of the backlight module that Fig. 1 provides for first embodiment of the invention.

The top view of the backlight module that Fig. 2 provides for second embodiment of the invention.

The top view of the backlight module that Fig. 3 provides for third embodiment of the invention.

The top view of the backlight module that Fig. 4 provides for fourth embodiment of the invention.

Main element symbol description

Backlight module	1、1a
		LGP	10
Part I	11
		Side plane	111
Micro-structural	112
		Projection	113
Pit	114
		Part II	12
LED source	20

Following detailed description of the invention further illustrates the present invention in connection with above-mentioned accompanying drawing.

Detailed description of the invention

The top view of the backlight module 1 that Fig. 1 provides for a preferred embodiment of the present invention.Backlight module 1 comprises a LGP 10 and is arranged on some LED sources 20 of LGP 10 1 sides.

LGP 10 is a thin type flat board, and it has the Part I 11 that coordinates with these some LED sources 20 and away from these some LED sources 20 and the Part II 12 that joins with Part I 11.The refractive index N1 of the Part I 11 of LGP 10 and the refractive index N2 of Part II 12 are unequal.Part I 11 has the side plane 111 away from Part II 12, and these some LED sources 20 are closely arranged on side plane 111 and are transversely arranged.Part I 11 is formed with a micro-structural 112 in the side near Part II 12, the rising angle that micro-structural 112 makes each LED source 20 inject the light on it becomes large, when the light sending when each LED source 20 passes through Part I 11 directive Part II 12, owing to having micro-structural 112, its rising angle increases.In the present embodiment, these some LED sources 20 are attached on Part I 11; The projection of protruding towards Part II 12 113 that micro-structural 112 is several horizontally sets, and the refractive index N1 of the Part I 11 of LGP 10 is less than the refractive index N2 of Part II 12.Further, the cross section semicircular in shape of projection 113.Refer to Fig. 2, understandably, the cross section of projection 113 also can be triangular in shape.

In the time that backlight module 1 moves, the Part I 11 of the light directive LGP 10 that these some LED sources 20 send, in micro-structural, 112 places reflect.Because the refractive index N1 of the Part I 11 of LGP 10 is less than the refractive index N2 of Part II 12, and micro-structural 112 is several projections 113 of protruding towards Part II 12, according to the law of refraction of light, the light that these some LED sources 20 send is refracted at micro-structural 112 places, and its refracted ray is more dispersed compared with incident ray, be that dispersion angle becomes greatly, thereby light mixing distance is shortened, the light that these some LED sources 20 send is more even.

In the present invention, because LGP 10 comprises that one near the Part I 11 of these some LED sources 20 with away from these some LED sources 20 and the Part II 12 that joins with Part I 11, and Part I 11 has the side plane 111 away from Part II 12, these some LED sources 20 are closely arranged on side plane 111, therefore avoided generation gap between these some LED sources 20 and LGP 10, make the light that originally can expose from gap location inject the inside of LGP 10, improved the utilization rate of light; In addition, be formed with a micro-structural 112 at Part I 11 near a side of Part II 12, micro-structural 112 can make the rising angle of LED source 20 increase, thereby the light that these some LED sources 20 are sent is more even.

Refer to Fig. 3, it is depicted as the top view of the backlight module 1a that another preferred embodiment of the present invention provides.The structure of backlight module 1a and above-mentioned backlight module 1 is similar, its difference is only: micro-structural 112 is several horizontally sets and the pit 114 that caves in towards side plane 111, and the refractive index N1 of the Part I 11 of LGP 10 is greater than the refractive index N2 of Part II 12.Further, the cross section semicircular in shape of pit 114.Refer to Fig. 4, understandably, the cross section of pit 114 also can be triangular in shape.

Understandably, Fig. 1 to Fig. 4 only demonstrates the principle of backlight module 1 for simplicity, and other structures of not shown backlight module 1, therefore in the present invention, backlight module 1 is not limited to and only includes structure shown in figure, it can also include liquid crystal panel and other structure, does not repeat them here.

Technology contents of the present invention and technical characterstic disclose as above, but those skilled in the art still may be based on teaching of the present invention and announcements and made all replacement and modifications that does not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present invention and modifications, and is contained by appended claim.

Claims

1. a backlight module, comprise a LGP and some LED sources of being located at this LGP side direction, it is characterized in that: this LGP comprises the Part I that coordinates with these some LED sources and away from these some LED sources and the Part II that joins with this Part I, and the refractive index of this Part I and the refractive index of this Part II are unequal, this Part I is provided with micro-structural in the side near this Part II, and the rising angle that this micro-structural makes each LED source inject the light on it becomes large.

2. backlight module as claimed in claim 1, is characterized in that: the refractive index of the Part I of this LGP is less than the refractive index of Part II.

3. backlight module as claimed in claim 2, is characterized in that: the projection of protruding towards this Part II that this micro-structural is several horizontally sets.

4. backlight module as claimed in claim 3, is characterized in that: the cross section semicircular in shape of this projection.

5. backlight module as claimed in claim 3, is characterized in that: the cross section of this projection is triangular in shape.

6. backlight module as claimed in claim 1, is characterized in that: the refractive index of the Part I of this LGP is greater than the refractive index of Part II.

7. backlight module as claimed in claim 6, is characterized in that: the pit towards these some LED source depressions that this micro-structural is several horizontally sets.

8. backlight module as claimed in claim 7, is characterized in that: the cross section semicircular in shape of this pit.

9. backlight module as claimed in claim 7, is characterized in that: the cross section of this pit is triangular in shape.

10. backlight module as claimed in claim 1, is characterized in that: this Part I has the side plane away from this Part II, and these some LED sources are attached on this side plane.