CN103899974A

CN103899974A - Backlight module

Info

Publication number: CN103899974A
Application number: CN201210568852.1A
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: CN103899974B

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 top surface and a bottom surface opposite to the top surface. A groove sunken in the direction far away from the light-emitting diode light sources is formed in one side, close to the light-emitting diode light sources, of the light guide plate. The extension direction of the groove and the arrangement direction of the light-emitting diode light sources are the same. The groove enables external light shining on the groove to be refracted, and then the original direction of the light is changed. A reflection layer is arranged on the bottom surface.

Description

Backlight module

Technical field

The present invention relates to a kind of backlight module, relate in particular to a kind of backlight module of the utilization rate 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 side direction.These some LED sources are transversely arranged, so make partial parallel cannot derive from the end face of this LGP after the light of the end face of this LGP is injected LGP, and directly send away from a side of this LED source from this LGP, so, this part light cannot be utilized, thereby the optical efficiency of backlight module is reduced.

Summary of the invention

In view of this, the present invention aims to provide a kind of backlight module of the utilization rate 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 an end face and a bottom surface relative with this end face, this LGP is provided with to the groove of the direction depression away from these some LED sources near a side of these some LED sources, and the bearing of trend of this groove is consistent with the orientation of these some LED sources, and this groove reflects the light of outside incident on it, and then changing the original direction of this light, this bottom surface is provided with reflecting layer.

In the present invention by being provided with to the groove of the side depression away from this LED source near a side of these some LED sources at this LGP, this groove makes the light of incident on it that refraction occur and then changes direction, make the light of the end face that is parallel to this LGP that this LED source sends form a fixed inclination with the end face of this LGP under the refraction of this groove, wherein a part penetrates this end face and bright dipping, avoid optical loss, improved the luminous efficiency of this backlight module.

Accompanying drawing explanation

The structural representation of the backlight module that Fig. 1 provides for a preferred embodiment of the present invention.

Fig. 2 is the inversion figure of backlight module in Fig. 1.

Fig. 3 is side view and the light path schematic diagram of backlight module in Fig. 1.

Main element symbol description

Backlight module	1
		LGP	10
End face	11
		Bottom surface	12
Raised line	121
		Leading flank	13
Groove	131
		Upper surface	132
Lower surface	133
		Trailing flank	14
Left surface	15
		Right flank	16
LED source	20

The following specific embodiment further illustrates the present invention in connection with above-mentioned accompanying drawing.

The specific embodiment

As depicted in figs. 1 and 2, the backlight module 1 that a preferred embodiment of the present invention provides, it comprises a LGP 10, is arranged on some LED sources 20 of the side direction of LGP 10.

LGP 10 is roughly a rectangle plate body, and the critical angle that total reflection occurs while being incident upon air the light in it is β.LGP 10 has an end face 11 and a bottom surface 12 relative with end face 11, and connects a leading flank 13, a trailing flank 14, a left surface 15 and a right flank 16 of end face 11 and bottom surface 12.

End face 11 is smooth surfaces shape, and bottom surface 12 is provided with some raised lines 121 that continuous adjacent arranges, and which is provided with reflecting layer.These some raised lines 121 extend to right flank 16 from the left surface 15 of LGP 10, and are arranged in parallel.In the present embodiment, the cross section of raised line 121 is curved.Certainly, the cross section of raised line 121 also can V-shaped or other shape.The longitudinal centre position of leading flank 13 is provided with to the groove 131 of trailing flank 14 1 side depressions, and the bearing of trend of groove 131 is identical with the bearing of trend of raised line 121.Groove 131 reflects the light of incident on it, and then changes its incident direction.In the present embodiment, the cross section of groove 131 is V-shaped, and groove 131 has a upper surface 132 of end face 11 of close LGP 10 and a lower surface 133 of the bottom surface 12 of close LGP 10.Certainly, the cross section of groove 131 also can be curved, zigzag or other shape.

The just groove 131 to LGP 10 of these some LED sources 20, and it is horizontally arranged at interval.

Please refer to Fig. 3, in the time that backlight module 1 is worked, the light that these some LED sources 20 send is incident upon the groove 131 of LGP 10 from all directions, and then is refracted to the inside of LGP 10.The upper surface 132 or lower surface 133 of the light directive groove 131 of the end face that is parallel to LGP 10 11 wherein sending from LED source 20, due to the refraction of upper surface 132 or lower surface 133, and make this part light depart from original direction, and then the end face 11 of directive LGP 10 or bottom surface 12.Below, be described with the light of the end face 11 that is incident to LGP 10.In the time of the end face 11 of light directive LGP 10, if when incidence angle is less than β, light directly penetrates end face 11 and bright dipping; If when incidence angle is more than or equal to β, light generation total reflection, and then be directed to the bottom surface 12 of LGP 10.Owing to being coated with on bottom surface 12 with reflecting layer, and which is provided with spaced some raised lines 121, therefore being directed to the light of bottom surface 12, this part can be reflected again to end face 11 by bottom surface 12, and when this light is incident to end face 11 again, incidence angle while causing it to be again incident to end face 11 due to the shape of raised line 121 changes, make this part light become possibility via end face 11 outgoing, if the incidence angle after changing is still greater than critical angle β, will be again by end face 11 guide floor 12, so repeatedly until light via end face 11 outgoing.Same, the path of the light of what LED source 20 sent the be incident to bottom surface 12 of LGP 10 is the same similar.So, the light of the end face that is parallel to LGP 10 11 that LED source 20 sends is originally under the upper surface 132 of groove 131 or the refraction of lower surface 133, pass through again some raised lines 121 of bottom surface 12 of LGP 10 and the effect of reflector layer, major part penetrates end face 11 and bright dipping, avoid light directly to lose from trailing flank 14 outgoing, improved the light utilization ratio of backlight module 1.

In the present invention, LGP 10 is by being provided with near a side of these some LED sources 20 to the groove 131 of the side depression away from LED source 20, this groove 131 makes the light of incident on it that refraction occur and then changes direction, and the bottom surface 12 of LGP 10 is provided with reflecting layer and some raised lines 121, so, the light of the end face that is parallel to LGP 10 11 that LED source 20 sends is originally under the refraction of groove 131, pass through again some raised lines 121 of bottom surface 12 of LGP 10 and the effect of reflector layer, by repeatedly changing its incidence angle that is incident to end face 11 until it is less than critical angle β, finally by by end face 11 outgoing, avoid light directly to lose from trailing flank 14 outgoing, improve the light utilization ratio of backlight module 1.

Understandably, the some raised lines 121 on the bottom surface 12 of LGP 10 also can arrange at interval.Fig. 1 to Fig. 3 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, and it can also include liquid crystal panel and other supporting construction, 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, this LGP has an end face and a bottom surface relative with this end face, it is characterized in that: this LGP is provided with to the groove of the direction depression away from these some LED sources near a side of these some LED sources, and the bearing of trend of this groove is consistent with the orientation of these some LED sources, and this groove reflects the light of outside incident on it, and then changing the original direction of this light, this bottom surface is provided with reflecting layer.

2. backlight module as claimed in claim 1, it is characterized in that: on this bottom surface, be provided with some raised lines, this reflecting layer is arranged on these some raised lines, these some raised lines extend to its relative opposite side along the orientation of LED source from a side of this LGP, and the bearing of trend of each raised line and the bearing of trend of this groove consistent.

3. backlight module as claimed in claim 2, is characterized in that: the cross section of this raised line is curved.

4. backlight module as claimed in claim 2, is characterized in that: the cross section of this raised line is V-shaped.

5. backlight module as claimed in claim 2, is characterized in that: these some raised lines are arranged on this bottom surface continuously.

6. backlight module as claimed in claim 2, is characterized in that: these some raised lines are disposed on this bottom surface.

7. backlight module as claimed in claim 1, is characterized in that: the cross section of this groove is V-shaped, and this groove has a lower surface near the bottom surface of a upper surface of the end face of this LGP and close this LGP.

8. backlight module as claimed in claim 1, is characterized in that: the curved or zigzag in the cross section of this groove.