CN102287759A

CN102287759A - Light guide plate and backlight module

Info

Publication number: CN102287759A
Application number: CN201010200769XA
Authority: CN
Inventors: 骆世平
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: 2010-06-15
Filing date: 2010-06-15
Publication date: 2011-12-21

Abstract

The invention relates to a light guide plate which comprises an incident surface, an emergent light surface crossed with the incident surface, and a bottom surface opposite to the emergent light surface, wherein the bottom surface is provided with a fluorescent layer, and the fluorescent layer is used for activating an incident light so as to form an emergent white light. The invention also provides with a backlight module utilizing the light guide plate.

Description

LGP and module backlight

Technical field

The present invention is about a kind of LGP and module backlight.

Background technology

Advantage such as liquid crystal indicator has gently, approaches, power consumption is little is widely used in the modernized information equipment.Because the liquid crystal panel itself in the liquid crystal indicator is not had a characteristics of luminescence, for reaching display effect, must provide a planar light source device to liquid crystal panel, as module backlight, the function of this planar light source device is to provide brightness area source adequately and uniformly to liquid crystal panel.LGP is the key element in the planar light source device, and it must possess the good optical design, so that the light that LGP can guide light source to send is converted to brightness and colourity all can reach necessarily required area source.

Traditional backlight module needs the spare parts of organizing such as light source, LGP, reflector plate, diffusion sheet, concentration piece to make up more, and the light percent of pass penetrates the light ratio and only remains less than 30% because need to see through multiple diaphragm and LGP.

Summary of the invention

In view of this, be necessary to provide a kind of element few and luminous high LGP and the module backlight of light utilization efficiency that evenly reach.

A kind of LGP, the exiting surface that it comprises incidence surface, intersect with described incidence surface, and and described exiting surface opposed bottom surface, have fluorescence coating on the described bottom surface, described fluorescence coating is used for being excited by incident light and forms the white light outgoing.

Further, described exiting surface has the film of penetrating.

A kind of module backlight, it comprises LGP and light source, the exiting surface that described LGP comprises the incidence surface that receives described light source and emit beam, intersect with described incidence surface, and and described exiting surface opposed bottom surface, have fluorescence coating on the described bottom surface, the optical excitation that described fluorescence coating is used for being sent by described light source is to form the white light outgoing.

Compared with prior art, the LGP of the embodiment of the invention has fluorescence coating, and the light that light source sends incides that the fluorescence excitation layer sends white light on the fluorescence coating of bottom surface, and white light is by the exiting surface outgoing, since the diffusion that is excited that white light is the fluorescence coating from the bottom surface, outgoing comparatively equably; Incided fluorescence coating by the white light after the exiting surface reflection and reflected once more by the exiting surface outgoing, thereby improved light utilization efficiency by it again.

Description of drawings

Fig. 1 is the schematic diagram of embodiment of the invention module backlight.

The main element symbol description

Module 1 backlight

LGP 10

Incidence surface 11

Exiting surface 12

Bottom surface 13

Penetrate film 14

Fluorescence coating 15

Light source 20

High refractive index film 141

Low refractive index film 142

The specific embodiment

Below in conjunction with accompanying drawing the present invention is described in further detail.

See also Fig. 1, embodiment of the invention module 1 backlight comprises LGP 10 and light source 20.LGP 10 can be plate or wedge shape.

LGP 10 comprises the incidence surface 11 that receives light source 20 and emit beam, with so that beam projecting and exiting surface 12 that links to each other with incidence surface 11 and and exiting surface 12 opposed bottom surface 13.Light source 20 can be blue light-emitting diode or ultraviolet light-emitting diodes.

Have the film of penetrating 14 on the exiting surface 12, the thickness that penetrates film 14 is less than 0.5 millimeter.Penetrate film 14 and comprise high refractive index film 141 and the low refractive index film 142 that alternately superposes, the number of plies of high refractive index film 141 and low refractive index film 142 is all smaller or equal to 10 layers.Wherein, the material of high refractive index film 141 is titanium dioxide (TiO ₂) or three oxidations, two tantalum (Ta ₂O ₃), the material of low refractive index film 142 is silica (SiO ₂).

Penetrating film 14 can utilize CVD method such as vacuum deposition method, electricity slurry deposition process, method for sputtering etc. to form high refractive index film 141 and low refractive index film 142 or low refractive index film 142 and high refractive index film 141 successively on exiting surface 12.Certainly, also can utilize ink ejecting method or screen printing method to form and penetrate film 14.

Reflected by bottom surface 13 and incide light on the exiting surface 12 successively by high refractive index film 141 or low refractive index film 142, owing to have the different interface of refractive index between the film, make incident light between the light that each boundary reflection is returned, produce interference, less reverberation or areflexia light produce, more light is from exiting surface 12 outgoing, thereby makes the penetrance of light increase.

Bottom surface 13 is provided with fluorescence coating 15, and fluorescence coating 15 adopts yellow fluorescence layer or three primary colours (red, green, blue) fluorescence coating.The light that light source 20 sends is in incidence surface 11 enters LGP 10 and incide on the fluorescence coating 15 on the bottom surface 13, and fluorescence coating 15 is excited by incident light and sends white light, and white light is through exiting surface 13 outgoing.

Penetrate film 14 and be used for seeing through the light of wavelength 400 to 700 nanometers, and the light of other wavelength is reflexed in the LGP 10.

The white light that fluorescence coating 15 sends is by exiting surface 12 outgoing, since the diffusion that is excited that white light is the fluorescence coating 15 from the bottom surface 13, outgoing comparatively equably, again, incided fluorescence coating 15 by the white light after exiting surface 13 reflections and reflected once more by exiting surface 12 outgoing, thereby improved light utilization efficiency by it.

When light source 20 was blue light-emitting diode, fluorescence coating 15 was the yellow fluorescence layer, and the component of yellow fluorescence layer 15 comprises Y ₃Al ₅O ₁₂: Ce ³⁺

When light source 20 was ultraviolet light-emitting diodes, fluorescence coating 15 comprised three primary colors fluorescent powder, and three primary colors fluorescent powder comprises red fluorescence powder, green emitting phosphor and blue colour fluorescent powder, and the red fluorescence powder component comprises Y ₂O ₃: Eu ²⁺, YBO ₃: Eu ³⁺Or GdBO ₃: Eu ³⁺, the green emitting phosphor component comprises Zn ₂SiO ₄: Mn ²⁺, ZnSiO _x: Mn ²⁺Or mix Mn ²⁺Many aluminates, the blue colour fluorescent powder component comprises BaMgAlO _X1: Eu ²⁺, CaMgSiO _X2: Eu ²⁺, BaMgAl ₁₀O ₁₇: Eu ²⁺Or other mixes Eu ²⁺Many aluminates, wherein, the value of x is 1 or 2, the value of x1 is 1,2 or 3, the value of x2 is 1 or 2.

Light source 20 is not limited to blue light-emitting diode and ultraviolet light-emitting diodes, as long as light source 20 can send white light by fluorescence excitation layer 15.

Be understandable that those skilled in the art also can do other variation etc. and be used for design of the present invention in spirit of the present invention, as long as it does not depart from technique effect of the present invention and all can.The variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.

Claims

1. LGP, the exiting surface that it comprises incidence surface, intersect with described incidence surface, and with described exiting surface opposed bottom surface, it is characterized in that having fluorescence coating on the described bottom surface, described fluorescence coating is used for being excited with the outgoing of formation white light by incident light.

2. LGP as claimed in claim 1 is characterized in that, has the film of penetrating on the described exiting surface, and the described film that penetrates is used for seeing through wavelength at the light of 400 to 700 nanometers and reflect the light of other wavelength.

3. LGP as claimed in claim 2 is characterized in that, the described film that penetrates comprises high refractive index film and the low refractive index film that is arranged alternately.

4. LGP as claimed in claim 3 is characterized in that, the material of described high refractive index film is titanium dioxide or three oxidations, two tantalums, and the material of described low refractive index film is a silica.

5. LGP as claimed in claim 2 is characterized in that, the described thickness of film that penetrates is less than 0.5 millimeter.

6. as each described LGP of claim 1 to 5, it is characterized in that described fluorescence coating adopts yellow fluorescent powder or three primary colors fluorescent powder.

7. LGP as claimed in claim 6 is characterized in that, described three primary colors fluorescent powder comprises red fluorescence powder, green emitting phosphor and blue colour fluorescent powder, and described red fluorescence powder component comprises Y ₂O ₃: Eu ²⁺, YBO ₃: Eu ³⁺, GdBO ₃: Eu ³⁺, described green emitting phosphor component comprises Zn ₂SiO ₄: Mn ²⁺, ZnSiO _x: Mn ²⁺Or mix Mn ²⁺Many aluminates, described blue colour fluorescent powder component comprises BaMgAlO _X1: Eu ²⁺, CaMgSiO _X2: Eu ²⁺, BaMgAl ₁₀O ₁₇: Eu ²⁺Or other mixes Eu ²⁺Many aluminates, wherein, the value of x is 1 or 2, the value of x1 is 1,2 or 3, the value of x2 is 1 or 2.

8. module backlight, it comprises light source and LGP, the exiting surface that described LGP comprises the incidence surface that receives described light source and send optical fiber, intersect with described incidence surface, and and described exiting surface opposed bottom surface, it is characterized in that, have fluorescence coating on the described bottom surface, the optical excitation that described fluorescence coating is used for being sent by described light source is to form the white light outgoing.

9. module backlight as claimed in claim 8 is characterized in that, described light source is a blue light-emitting diode, and described fluorescence coating comprises yellow fluorescent powder.

10. module backlight as claimed in claim 8 is characterized in that, described yellow fluorescence layer component comprises Y ₃Al ₅O ₁₂: Ce ³⁺

11. module backlight as claimed in claim 8 is characterized in that, described light source is a UV LED, and described fluorescence coating comprises three primary colors fluorescent powder.

12. module backlight as claimed in claim 11 is characterized in that, described three primary colors fluorescent powder comprises red firefly powder, green firefly powder and blue colour fluorescent powder, and described red fluorescence powder component comprises Y ₂O ₃: Eu ²⁺, YBO ₃: Eu ³⁺, GdBO ₃: Eu ³⁺, described green emitting phosphor component comprises Zn ₂SiO ₄: Mn ²⁺, ZnSiO _x: Mn ²⁺Or mix Mn ²⁺Many aluminates, described blue colour fluorescent powder component comprises BaMgAlO _X1: Eu ²⁺, CaMgSiO _X2: Eu ²⁺, BaMgAl ₁₀O ₁₇: Eu ²⁺Or other mixes Eu ²⁺Many aluminates, wherein, the value of x is 1 or 2, the value of x1 is 1,2 or 3, the value of x2 is 1 or 2.

13., it is characterized in that described LGP is plate or wedge shape as each described module backlight of claim 8 to 12.