CN205608346U

CN205608346U - Backlight module group

Info

Publication number: CN205608346U
Application number: CN201620194134.6U
Authority: CN
Inventors: 徐鸣鸽; 王冰清
Original assignee: InfoVision Optoelectronics Kunshan Co Ltd
Current assignee: InfoVision Optoelectronics Kunshan Co Ltd
Priority date: 2016-03-14
Filing date: 2016-03-14
Publication date: 2016-09-28
Anticipated expiration: 2026-03-14

Abstract

The utility model discloses a backlight module group, include: the light guide plate, set up in this light guide plate sideway laser lamp -house, its characterized in that, backlight module group is still including setting up the X prism and at least one diffusion piece between laser lamp -house and light guide plate, it is reentrant to pass at least one diffusion piece again behind the optics process X prism that laser lamp -house sent the light guide plate, the X prism forms X -shapeds by 4 the same positive prisms, and wherein, every positive prism has firstly to the third plane, and the first plane of one of them positive prism just sets up laser lamp -house, the light that laser lamp -house sent forms the area source through at least one diffusion piece and shines towards the light guide plate. The utility model provides a backlight module group improves luminous efficiency, reduces the consumption of being shaded, saves the cost.

Description

Backlight module

Technical field

This utility model belongs to field of display, more particularly, to a kind of backlight module.

Background technology

At present, in liquid crystal module display, back light generally uses LED, is spaced by LED Beat on a FPC, but LED light source luminance is low, energy consumption is high.In order to reduce energy consumption and Cost can only reduce LED usage amount on the premise of not producing Hotspot as far as possible；And in brightness Aspect, use increases LED luminance, uses brightening film sheet more, adjusts the methods such as light guide plate mesh point and comes Reduce optical loss, increase brightness utilization rate, but LED can promote brightness and have limitation, In the product of some high brightness demands, LED can only achieve the goal by increasing a number, light guide plate Adjusting version i.e. time-consuming, require the highest to site, brightening film sheet increases cost also with quality-improving.

Laser diode (Laser Diode, LD), as a kind of efficient luminous source, has monochromaticity Good, beam emissions angle is little, luminous intensity is high, volume is little, life-span length etc. various features, therefore Laser diode replaces LED light source can improve light source light-emitting efficiency, reduces power consumption and cost.

Utility model content

The purpose of this utility model is to provide a kind of backlight module.

According to one side of the present utility model, it is provided that a kind of backlight module, including: light guide plate, set It is placed in the LASER Light Source that this light guide plate is lateral, it is characterised in that described backlight module also includes arranging X prism between LASER Light Source and light guide plate and at least one diffusion sheet, described LASER Light Source is sent out The optics gone out enters back into described light guide plate again through at least one diffusion sheet after X prism, described X prism is formed X-shaped by 4 identical positive prisms, and wherein, each positive prism has first To the 3rd plane, LASER Light Source is just arranged by the first plane of one of them positive prism, described sharp The light that radiant sends forms area source through at least one diffusion sheet and irradiates towards light guide plate.

Preferably, described light guide plate have the end face bottom surface relative with this end face and connect end face and The incidence surface of bottom surface, the light that described LASER Light Source sends injects light guide plate through this incidence surface.

Preferably, described incidence surface is plane.

Preferably, described incidence surface is provided with lattice point structure.

Preferably, described LASER Light Source is made up of N number of laser diode.

Preferably, described backlight module also includes N-1 reflecting mirror, respectively with N-1 reflecting mirror And X prism is oppositely arranged, send for N-1 the laser diode making described reflecting mirror corresponding Light enter X prism through described N-1 reflecting mirror, and transfer through X prism with directional light Diffusion sheet injected by line.

Preferably, described backlight module also includes being arranged between described LASER Light Source and X prism Expand device, for the light extension bunchy sent by LASER Light Source.

The backlight module that this utility model provides uses LASER Light Source as light source, it is possible to reduce brightness Decaying low, reduce energy consumption, the volume making backlight module is little；And the Wavelength tunable of LASER Light Source joint, Color also can be adjusted the most at any time；The polarization direction of LASER Light Source can be adjusted by half-wave plate Joint, improves the light utilization efficiency of light source.The present embodiment also utilize the light guide plate with lattice point structure make into The light being mapped to light guide plate can uniformly export.

Accompanying drawing explanation

By description to this utility model embodiment referring to the drawings, of the present utility model above-mentioned And other objects, features and advantages will be apparent from, in the accompanying drawings:

Fig. 1 shows element and the light path schematic diagram of the backlight module that this utility model embodiment provides；

Fig. 2 shows that the element of the backlight module that another embodiment of this utility model provides and light path are shown It is intended to；

Fig. 3 shows the schematic diagram of the lattice point structure of light guide plate in this utility model embodiment.

Detailed description of the invention

It is more fully described various embodiment of the present utility model hereinafter with reference to accompanying drawing.Attached at each In figure, identical element uses same or similar reference to represent.For the sake of clarity, Various piece in accompanying drawing is not necessarily to scale.

This utility model can present in a variety of manners, some of them example explained below.

Fig. 1 shows element and the light path schematic diagram of the backlight module that this utility model embodiment provides. As it is shown in figure 1, described backlight module 100, including light guide plate 10, it is arranged on this light guide plate 10 Lateral LASER Light Source 20, the X that is arranged between described LASER Light Source 20 and described light guide plate Prism 30 and at least one diffusion sheet 40.The light that described LASER Light Source 20 sends passes X prism Described light guide plate 10 is entered back into again through described diffusion sheet 40 after 30.

Above-mentioned light guide plate 10 is substantially in a rectangular panel body, and its interior light can occur when being incident upon air entirely The critical angle of reflection is β.Described light guide plate 10 has an end face 11 and is oppositely arranged with end face 11 Bottom surface 12, and connect end face 11 and bottom surface 12 and towards entering that described diffusion sheet 40 is arranged Bright finish 13.Described end face 11 and bottom surface 12 use the modes such as black and white glue or white paint to improve optics profit By rate.

In the present embodiment, described incidence surface 13 is plane, and is provided with lattice point structure 14.As Shown in Fig. 3, described lattice point structure include multiple by radium-shine, print or hit a little etc. formed irregular The site of shape, the density of site affects brightness.

LASER Light Source 10 can be pulse laser (such as YAG laser, ruby laser) In xenon flash lamp, semiconductor pumped laser (is again DPSS laser, such as green laser pen) In semiconductor laser, in gas discharge laser (such as helium neon laser, CO2 laser instrument) Electric discharge, the chemical reaction in chemical laser (oxygen-iodine laser of such as weapongrade).

Described X prism 30 is formed X-shaped, wherein, often by 4 identical positive prism 31-34 Individual positive prism has the first to the 3rd plane (3n1-3n3), one of them positive prism such as this enforcement LASER Light Source 20 is just arranged by the first plane 311 of the positive prism 31 of first in example, described sharp The light that radiant 20 sends forms area source through described diffusion sheet 40 and irradiates towards light guide plate.

Described diffusion sheet 40 is for providing a uniform area source for display.Base material need to select light The material such as PET/PC/PMMA that transmitance is high.The most traditional diffusion barrier is mainly at diffusion barrier In base material, add the chemical particle of many, as scattering particles, and existing diffuser plate it is micro- Particle is dispersed in tree and refers between layer, so light is can two refractions the most again through diffusion layer Passing in the medium that rate is different, light will occur many refractions, reflect and scattering at the same time Phenomenon, the most just causes the effect of optics diffusion.In the present embodiment, diffusion sheet 40 can set Put multiple.

In a preferred embodiment, described backlight module also includes being arranged on described LASER Light Source And expand device 60 between X prism, for the light extension bunchy sent by LASER Light Source.

In the present embodiment, described in expand device 60 can be laser beam expanding lens, but be not limited to this. Laser beam expanding lens with the diameter of expanded beam, can reduce the angle of divergence of laser beam.A branch of expanded The angle of divergence of light beam, and expand than inversely proportional change.Compare with without the light beam expanded, expand Light beam after bundle can be focused less.From the spot size of laser beam of laser instrument output with dissipate Angle product is optical invariant, is approximately certain value.When waist radius expands x times, it dissipates The 1/x that the corresponding boil down in angle is original.The compression angle of divergence can not improve beam quality, and beam quality is Waist radius and the product of the angle of divergence；By the increase with waist radius while the compression angle of divergence, Then spot size increases.

Fig. 2 shows that the element of the backlight module that another embodiment of this utility model provides and light path are shown It is intended to.As in figure 2 it is shown, described backlight module 100, including light guide plate 10, it is arranged on this leaded light The lateral LASER Light Source 20 of plate 10, it is arranged at described LASER Light Source 20 and described light guide plate 10 Between X prism 30 and at least one diffusion sheet 40.The light that described LASER Light Source 20 sends Described light guide plate 10 is entered back into again through described diffusion sheet 40 after X prism 30.

Wherein, described LASER Light Source 20 is by N number of laser diode (21-2n).Swash with three below Have as a example by optical diode (red laser diode, green laser diode, blue laser diode) Body explanation.

LASER Light Source 20 includes that red laser diode 21, green laser diode 22, blueness swash Optical diode 23.The laser diode of different colours can be in any permutation.

One preferred embodiment, as in figure 2 it is shown, green laser diode 22 and X prism Just to setting, red laser diode 21 is positioned at the surface of green laser diode 22, blue Laser diode 23 is positioned at the underface of green laser diode 22.

Described backlight module 100 also includes the first reflecting mirror 51 and the second reflecting mirror 52.Wherein, First reflecting mirror 51 is positioned at the surface of X prism, and is oppositely arranged with red laser diode 21； Second reflecting mirror 52 is positioned at the underface of X prism, and is oppositely arranged with blue laser diode 23.

First reflecting mirror 51 is for being reflected into X rib by the light that red laser diode 21 sends Mirror, the refraction being then passed through X prism injects diffusion sheet 40 with parallel rays.

Second reflecting mirror 51 is for being reflected into X rib by the light that blue laser diode 23 sends Mirror, the refraction being then passed through X prism injects diffusion sheet 40 with parallel rays.

Above-mentioned light guide plate 10 is substantially in a rectangular panel body, and its interior light can occur when being incident upon air entirely The critical angle of reflection is β.Described light guide plate 10 has an end face 11 and is oppositely arranged with end face 11 Bottom surface 12, and connect end face 11 and bottom surface 12 and towards entering that described diffusion sheet 40 is arranged Bright finish 13.

Described X prism 30 is formed X-shaped, wherein, often by 4 identical positive prism 31-34 Individual positive prism has the first to the 3rd plane (3n1-3n3).

Wherein, the first plane 311 of the first positive prism 31 in the present embodiment is just to green laser Diode 21 is arranged, the first of the first positive prism 31 of plane 321 first of the second positive prism Plane 311 is vertically arranged, and towards the first reflecting mirror 51；First plane 331 of the 3rd positive prism First plane 311 of the first positive prism 31 is vertically arranged, and towards the second reflecting mirror 52.

Described diffusion sheet 40 is for providing a uniform area source for display.Base material need to select light The material such as PET/PC/PMMA that transmitance is high.The most traditional diffusion barrier is mainly at diffusion barrier In base material, add the chemical particle of many, as scattering particles, and existing diffuser plate it is micro- Particle is dispersed in tree and refers between layer, so light is can two refractions the most again through diffusion layer Passing in the medium that rate is different, light will occur many refractions, reflect and scattering at the same time Phenomenon, the most just causes the effect of optics diffusion.

Preferably, expand device 60 described in include swashing with red laser diode 21, green respectively The first of optical diode 22 and blue laser diode 23 correspondence expands device 61, second expands Device 62 and the 3rd expands device 63.

According to embodiment of the present utility model as described above, these embodiments do not have detailed descriptionthe All of details, is also not intended to the specific embodiment that this utility model is only described.Obviously, according to Above description, can make many modifications and variations.This specification is chosen and is specifically described these and implements Example, is to preferably explain principle of the present utility model and actual application, so that affiliated technology Skilled person can utilize this utility model and the amendment on the basis of this utility model well Use.The scope that protection domain of the present utility model should be defined with this utility model claim It is as the criterion.

Claims

1. a backlight module, including: light guide plate, is arranged at the LASER Light Source that this light guide plate is lateral, It is characterized in that, described backlight module also includes the X rib being arranged between LASER Light Source and light guide plate Mirror and at least one diffusion sheet, the optics that described LASER Light Source sends after X prism again through extremely A few diffusion sheet enters back into described light guide plate, and described X prism is by 4 identical positive prism shapes Becoming X-shaped, wherein, each positive prism has the first to the 3rd plane, one of them positive prism The first plane just LASER Light Source is arranged, light that described LASER Light Source sends is through at least one Diffusion sheet forms area source and irradiates towards light guide plate.

Backlight module the most according to claim 1, it is characterised in that described light guide plate has Bottom surface that end face is relative with this end face and connect end face and the incidence surface of bottom surface, described LASER Light Source The light sent injects light guide plate through this incidence surface.

Backlight module the most according to claim 2, it is characterised in that described incidence surface is flat Face.

Backlight module the most according to claim 3, it is characterised in that set on described incidence surface It is equipped with lattice point structure.

Backlight module the most according to claim 1, it is characterised in that described LASER Light Source by N number of laser diode forms.

Backlight module the most according to claim 5, it is characterised in that described backlight module is also Including N-1 reflecting mirror, it is oppositely arranged with N-1 reflecting mirror and X prism respectively, is used for making The light that N-1 the laser diode that described reflecting mirror is corresponding sends is through described N-1 reflecting mirror Enter X prism, and inject diffusion sheet through the turnover of X prism with parallel rays.

Backlight module the most according to claim 1, it is characterised in that described backlight module is also Device is expanded, for being sent out by LASER Light Source including be arranged between described LASER Light Source and X prism The light extension bunchy gone out.