CN201103850Y

CN201103850Y - Backlight module

Info

Publication number: CN201103850Y
Application number: CNU2007201934112U
Authority: CN
Inventors: 洪哲槟; 吕学荣
Original assignee: Foxlink Image Technology Co Ltd
Current assignee: Foxlink Image Technology Co Ltd
Priority date: 2007-11-05
Filing date: 2007-11-05
Publication date: 2008-08-20
Anticipated expiration: 2017-11-05

Abstract

The utility model provides a backlight module, comprising a light resource and a light guide plate which is provided with a light introduction surface. The light resource has a plurality of light emitting diodes arranged in a line with certain distances; the light source is arranged on one side of the light introduction surface,; the light introduction surface is provided with a plurality of lenses which are arranged corresponding to the positions of the gaps between light emitting diodes. The module has the advantage that as the light beam projected to the light introduction surface of the light guide plate is refracted with the condensing effect of the lenses and a part of light beam is concentrated on the position of the light guide plate with low brightness, the brightness of the light beam projected into the light guide plate is uniform and the brightness of the output beam of the backlight module is uniform.

Description

Backlight module

Technical field

The utility model relates to a kind of backlight module, relates in particular to a kind of even brightness side light type back light module.

Background technology

Side light type back light module is widely used in the electronic equipments such as LCD and scanner.Backlight module shows beam direction LCD or the scanner that external light source sent or scan function with realization.

See also Fig. 1, be the structural representation of existing a kind of side light type back light module 1 '.This backlight module 1 ' has a light source 10 ', a reflecting plate 20 ', a LGP 30 ', a diffuser plate 40 ' and a blast sheet 50 '.(Light-emitting Diode LED) forms this light source 10 ' by a plurality of light emitting diodes 11 ' arranged in a straight line.LGP 30 ' is wedge shape, has an incidence surface 31 ', a bottom surface 32 ' and an exiting surface 33 ' that tilts.Light source 10 ' is provided with respect to the incidence surface 31 ' of LGP 30 ', the bottom surface 32 ' that reflecting plate 20 ' is positioned at the below of LGP 30 ' and is parallel to LGP 30 ' is provided with, and diffuser plate 40 ' and blast sheet 50 ' are cascading in LGP 30 ' top and be arranged in parallel with the exiting surface 33 ' of LGP 30 '.Light source 10 ' emitted light beams enters in the LGP 30 ' from the incidence surface 31 ' of LGP 30 '; The light beam that enters LGP 30 ' is penetrated by the exiting surface 33 ' of LGP 30 ' after through the repeatedly total reflection of the reflection of reflecting plate 20 ' and LGP 30 '.Improve its brightness by blast sheet 50 ' from the light beam that LGP 30 ' penetrates again after diffuser plate 40 ' diffusion, the light beam that penetrates from blast sheet 50 ' throws to LCD or scanner.

Please in conjunction with consulting Fig. 2, because the light source 10 ' of this backlight module 1 ' is made up of a plurality of light emitting diodes 11 ', and the Luminance Distribution characteristic of light emitting diode 11 ' makes that the light beam that enters LGP 30 ' is higher in the brightness of the vertical ejaculation direction of light emitting diode 11 ', the brightness of penetrating direction in the inclination of light emitting diode 11 ' is lower, thereby light source 10 ' is injected the beam brightness skewness of LGP 30 ' and is presented the bright state that secretly replaces, and then influences the display effect of LCD or scanner.

Summary of the invention

The purpose of this utility model is to provide a kind of at the defective that above-mentioned prior art exists can make outgoing beam even brightness backlight module.

For achieving the above object, the utility model provides a kind of backlight module, comprises a light source and a LGP.This LGP has an incidence surface.This light source comprises a plurality of light emitting diodes along straight line and interval one spacing arrangement; Described light source is arranged on a side of the incidence surface of LGP.The incidence surface of this LGP is provided with a plurality of lens, and each lens is all corresponding to the position in space between the adjacent light emitting diode.

Backlight module of the present utility model has following useful technique effect than prior art: by the incidence surface at LGP a plurality of lens are set, make projection under the optically focused effect of light beam at lens of the incidence surface of LGP, reflect, segment beam is aggregated in the lower position of brightness of LGP, thereby make that the brightness of the light beam enter LGP is even, and then make the outgoing beam brightness of this backlight module even.

Description of drawings

Fig. 1 is the side schematic view of existing a kind of backlight module.

Fig. 2 enters schematic diagram in the LGP for the light beam of the light emitted of backlight module shown in Figure 1 via the incidence surface of LGP.

Fig. 3 is the side schematic view of the utility model backlight module.

Fig. 4 enters schematic diagram in the LGP for the light beam of the light emitted of backlight module shown in Figure 3 via the incidence surface of LGP.

Wherein, description of reference numerals is as follows:

Backlight module 1,1 '

light source

10,10 '

Light emitting diode 11,11 ' reflecting plate 20,20 '

LGP 30,30 ' incidence surface 31,31 '

Bottom surface 32,32 ' exiting surface 33,33 '

Diffuser plate 40,40 ' blast sheet 50,50 '

Lens 60

The specific embodiment

For describing technology contents of the present utility model, structural feature, the purpose of being reached and effect in detail, described in detail below in conjunction with embodiment and conjunction with figs..

See also Fig. 3, the utility model backlight module 1 comprises light source 10, reflecting plate 20, LGP 30, diffuser plate 40 and blast sheet 50.

See also Fig. 3 and Fig. 4, light source 10 is formed along straight line and interval one spacing arrangement by a plurality of light emitting diodes 11.LGP 30 roughly is wedge shape, and it has an incidence surface 31, a bottom surface 32 and an exiting surface 33.Light source 10 relative set are in a side of the incidence surface 31 of LGP 30.The bottom surface 32 of LGP 30 is an inclined plane, and the angle of itself and incidence surface 31 is an acute angle; The exiting surface 33 of LGP 30 and incidence surface 31 vertical settings.Described reflecting plate 20 is parallel to bottom surface 32 settings of LGP 30 and is positioned at a corresponding side of the bottom surface 32 of LGP 30.Diffuser plate 40, blast sheet 50 all be arranged at LGP 30 exiting surface 33 a corresponding side and be parallel to the exiting surface 33 of LGP 30.Diffuser plate 40 is between the exiting surface 33 and blast sheet 50 of LGP 30.The incidence surface 31 of LGP 30 is provided with the lens 60 of a plurality of convex surfaces towards light emitting diode 11, and lens 60 equal correspondences are arranged at the position in incidence surface 31 space between light emitting diode 11.

When self-luminous diode 11 emitted light beams enter LGP 30 through the incidence surface 31 of LGP 30, because the optically focused effect of lens 60, make the light beam of process lens 60 reflect, light beam after the refraction converges in the position of LGP 30 between light emitting diode 11, make the beam brightness of this position increase, and LGP 30 is reduced relatively over against the beam brightness of the position of light emitting diode 1, thereby enter the illuminance distribution of light beam after lens 60 refractions of LGP 30.The a part of light beam that enters LGP 30 penetrates and throws to diffuser plate 40 through the exiting surface 33 from LGP 30 after the total reflection effect of LGP 30; Some light beam enters LGP 30 once more after the bottom surface 32 of LGP 30 is penetrated again by reflecting plate 20 reflections in addition, and the exiting surface 33 from LGP 30 penetrates and throws to diffuser plate 40 then.This projection is throwed to blast sheet 50 after diffuser plate 40 diffusions to the light beam of diffuser plate 40 again, and the light beam projection behind blast sheet 50 is to LCD or scanner, with the Presentation Function of reaching LCD or the scan function of scanner.

As mentioned above, the utility model backlight module 1 is provided with a plurality of lens 60 by the incidence surface 31 at LGP 30, make projection under the optically focused effect of light beam at lens 60 of the incidence surface 31 of LGP 30, reflect, segment beam is aggregated in the lower position of brightness of LGP 30, thereby make that the beam brightness that enters LGP 30 is even, and then make the outgoing beam brightness of this backlight module 1 even.In sum, the utility model backlight module can reach described effect by the structure of above-mentioned disclosure.But above disclosed only be preferred embodiment of the present utility model, from not limiting interest field of the present utility model with this.The equivalence that every the technical staff in the technical field does according to the spirit of utility model is modified or is changed, and all should be encompassed in the application's the claim.

Claims

1. a backlight module comprises LGP and light source, and this LGP has an incidence surface; This light source is arranged on a side of the incidence surface of LGP, and this light source comprises a plurality of light emitting diodes along straight line and interval one spacing arrangement; It is characterized in that: the incidence surface of this LGP is provided with a plurality of lens, and each lens is all corresponding to the position in space between the adjacent light emitting diode.

2. backlight module according to claim 1 is characterized in that: described lens have a convex surface towards described light source protrusion.

3. backlight module according to claim 2 is characterized in that: described LGP also has bottom surface and exiting surface; This backlight module also has reflecting plate, diffuser plate and blast sheet; This reflecting plate be arranged at this LGP the bottom surface a corresponding side and be parallel to the bottom surface of this LGP; This diffuser plate and this blast sheet all be arranged at this LGP exiting surface a corresponding side and be parallel to the exiting surface of this LGP, this diffuser plate is between the exiting surface and this blast sheet of this LGP.

4. backlight module according to claim 3 is characterized in that: the bottom surface of described LGP and the angle of incidence surface are an acute angle; The exiting surface of this LGP is vertical with incidence surface to be provided with.