CN100419532C

CN100419532C - Back light system and its manufacturing method

Info

Publication number: CN100419532C
Application number: CNB2003101120360A
Authority: CN
Inventors: 江宗韦; 郑文峰
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: 2003-11-01
Filing date: 2003-11-01
Publication date: 2008-09-17
Anticipated expiration: 2023-11-01
Also published as: CN1612019A

Abstract

The present invention relates to a back light system which comprises a frame, a light guide plate and at least one light source, wherein the frame is provided with concave zone with an upward opening, and at least one cavity which is connected with the concave zone, and the light source is arranged in the cavity. The light guide plate is arranged in the concave zone by an injection molding technology, and thereby, the light guide plate and the frame form an integral structure.

Description

Back light system and manufacture method thereof

[technical field]

The invention relates to a kind of back light system, particularly about a kind of back light system that is used for liquid crystal indicator.

[background technology]

Because advantages such as the liquid crystal indicator tool is light, thin, power consumption is little are widely used in modernized information equipments such as notebook, mobile phone, personal digital assistant.But, need provide back light system to realize Presentation Function for it because liquid crystal itself is not had a characteristics of luminescence.

Seeing also Fig. 1, is a kind of back light system structural representation of prior art.This back light system 1 comprises light guide plate 4, light source 5, light source cover 6, reflector plate 7 and framework 8.This light guide plate 4 comprises two relative light entrance face 4A, a light-emitting face 4B, a bottom surface 4C and a plurality of sides (not mark), this bottom surface 4C is provided with a plurality of sites 9, the effect of this light guide plate 4 is that the light that guiding light source 5 sends penetrates from light-emitting face 4B, improves the homogeneity of liquid crystal panel (figure does not show) emitting brightness; The light entrance face 4A of light source 5 relative light guide plate 4 is provided with and light emission is arrived light guide plate 4, it can be cold cathode fluorescent lamp (Cold CathodeFluorescence Lamp, CCFL), light emitting diode (Light-Emitting Diode, LED) or electroluminescent lamp (Electroluminescent Lamp, EL); Reflector plate 7 is arranged between light guide plate 4 bottom surface 4C and the framework 8, and its effect is the light of reflection from the bottom surface 4C of light guide plate 4, to strengthen the emitting brightness of this back light system 1; Framework 8 generally is a macromolecule resin material, and it mainly acts on is assemblies such as protection light guide plate 4, reflector plate 7 and light source 5.

This back light system 1 is assembled by light guide plate 4, light source 5, light source cover 6, reflector plate 7 and framework 8 cooperations, and United States Patent (USP) the 6th, 163 in addition, No. 350, the 6th, 502, No. 945, the 6th, 513, No. 943, the 6th, 590, No. 626 and the 6th, 593, the back light system that is disclosed for No. 980 assembles by assemblies such as light guide plate, light source, light source cover, reflector plate and frameworks.

But, the above-mentioned back light system that assembles is mainly assembled by manually-operated, this assembling process complexity therefore expend man-hour and human cost, and manually-operated exists instability and skill level difference, therefore each inter-module need be reserved than high tolerance, have big gap between the assembly of assembling back, in the communication process, the gap between assembly produces light leakage phenomena to light between assembly, cause the liquid crystal panel emitting brightness lower, influence properties of product.Though, adopt means such as mechanical automation to replace manually-operated to reduce the reservation tolerance in the actual engineering, it fails thoroughly to solve the lower problem of back light system panel emitting brightness that light leakage phenomena causes all the time.

[summary of the invention]

Back light system panel emitting brightness is lower in order to overcome in the prior art, complex structure and defect of high cost, the invention provides a kind of simple in structure, emitting brightness is higher and cost is low back light system.

The present invention also provides the manufacture method of above-mentioned back light system.

The technical scheme that technical solution problem of the present invention is adopted is: a kind of back light system is provided, it comprises a framework, a light guide plate and at least one light source, this framework has the recessed zone that an opening makes progress, at least one cavity that links to each other with this recessed zone, this light source is arranged on this cavity, wherein this light guide plate is to utilize to imbed ejection forming technique and be arranged on this recessed zone, thereby forms integral structure with this framework.

Back light system manufacture method of the present invention comprises the following steps: to provide a light guide plate, and this light guide plate is inserted in the mould; The fusion receptacle material is injected this mould, solidify receptacle material, make this framework and this light guide plate form integral structure, and make at least one cavity of formation on the framework relative with light guide plate; Take out this framework and this light guide plate; And at least one light source is arranged in the cavity of this framework, form a back light system.

Compare with prior art, the advantage of back light system of the present invention is: adopt and imbed ejection forming technique, framework and light guide plate form integral structure, so no gap exists between the assembly, can effectively reduce or eliminate light leakage phenomena, and the liquid crystal panel emitting brightness improves; Framework adopts highly reflective material to make, and therefore need not to use reflector plate and light source cover, and is simple in structure, and cost reduces.

[description of drawings]

Fig. 1 is a kind of back light system structural representation of prior art.

Fig. 2 is the stereographic map of back light system of the present invention.

Fig. 3 is the cut-open view of back light system of the present invention along the III-III direction.

Fig. 4 is the process flow diagram of back light system method for making of the present invention.

[embodiment]

Please consulting Fig. 2 and Fig. 3 together, is the structural representation of back light system 2 of the present invention.This back light system 2 comprises light guide plate 21, framework 22 and a plurality of light source 23.This framework 22 is box-like, it comprises side surface 222 that a lower surface 221, a plurality of and this lower surface 221 intersect and a upper surface 223 relative with this lower surface 221, this upper surface 223 be provided with that an opening makes progress recessed regional 224 with a plurality of and these recessed regional 224 cavitys that link to each other 225, the material of this framework 22 is polycarbonate (Polycarbonate of high reflection, PC) material, reflectivity is greater than 95%, as MitsubishiHPR3000, GE BFL2000 etc.; Light guide plate 21 is arranged on recessed regional 224 and form integral structures with this framework 22, it comprises a light entrance face 211, a light-emitting face adjacent with this light entrance face 211 212, one and this light-emitting face 211 opposed bottom surface 213 and a plurality of side 214, and the bottom surface 213 of this light guide plate 21 is provided with a plurality of light diffusions site 215; Light source 23 is that (Light-Emitting Diode, LED), it is interior and relative with the light entrance face 211 of light guide plate 21 that it is arranged on cavity 225 for light emitting diode.

This light guide plate 21 adopts with framework 22 and imbeds ejection formation (Insert Molding) technology formation integral structure.

, be the manufacture method of back light system 2 of the present invention please together with reference to figure 4.Use jetting formation process to form a light guide plate 21 earlier, it comprises a light entrance face 211, a light-emitting face 212, a bottom surface 213 and a plurality of side 214, and this bottom surface 213 is provided with a plurality of light diffusions site 215 (step 101); By mechanical arm this light guide plate 21 is inserted in the mould, this mould comprises a master mold, the die of one male model that cooperates with this master mold and between male model and master mold, wherein this die has a plurality of convex patterns, this convex pattern is a semicylinder, this semicylinder surface roughness Ra＜0.08um, the consistency of thickness of the light entrance face 211 of its convex height and light guide plate 21, when inserting light guide plate 21, the incidence surface 211 of light guide plate 21 contacts with the planar section of this semicylinder, in mould, inject the high reflected P C material of fusion, the PC material cured is a framework 22, and this framework 22 and light guide plate 21 formation integral structures (step 102); Take out the framework 22 and light guide plate 21 of integral structure, the light entrance face 211 of framework 22 and light guide plate 21 side that links to each other forms a plurality of cavitys 225, goes into light source 23, formation back light system 2 (step 103) in that cavity 225 is mid-.

Light guide plate is to make with transparent material such as acryl resin, polycarbonate, polyvinyl resin or glass etc.; The bottom surface of light guide plate is provided with light diffusion site so that light is transmitted to different directions in light guide plate, can make emergent ray more even, this light diffusion site can be shapes such as microprism shape, point-like, square, spherical shape, cylindric, square or pyramid.

Compare with existing manually-operated assembling back light system technology, back light system of the present invention adopts Imbed ejection forming technique, framework and LGP form integral structure, so between the assembly Gapless exists, and can effectively reduce or eliminate light leakage phenomena, and the liquid crystal panel emitting brightness improves; Framework adopts highly reflective material to make, and therefore need not to use reflector plate and light source cover, structure Simply, cost.

Claims

1. back light system, comprise a framework, a light guide plate and at least one light source, this framework has the recessed zone that an opening makes progress, with at least one cavity that links to each other with this recessed zone, this light guide plate has a light entrance face, this light source is arranged in this cavity and is relative with the light entrance face of light guide plate, it is characterized in that: this light guide plate is to utilize to imbed ejection forming technique and be arranged on this recessed zone, thereby forms integral structure with this framework.

2. back light system as claimed in claim 1 is characterized in that: the material of this framework is a highly reflective material.

3. back light system as claimed in claim 1 is characterized in that: the bottom surface of this light guide plate is provided with a plurality of light diffusions site.

4. back light system as claimed in claim 1 is characterized in that: this light source is a light emitting diode.

5. back light system as claimed in claim 1 is characterized in that: this light guide plate material is acryl resin, polycarbonate, polyvinyl resin or clear glass.

6. the manufacture method of a back light system comprises the following steps: to provide one to have the light guide plate of a light entrance face, and this light guide plate is inserted in the mould; The fusion receptacle material is injected this mould, solidifies receptacle material, form one with the framework of this light guide plate integral structure, and make at least one cavity of formation between the light entrance face of this framework and light guide plate; Take out this framework and this light guide plate; And at least one light source is arranged in the cavity of this framework and relative with the light entrance face of light guide plate, form a back light system.

7. back light system manufacture method as claimed in claim 6 is characterized in that: the material of this framework is a highly reflective material.

8. back light system manufacture method as claimed in claim 6 is characterized in that: comprise that further one forms the step of a plurality of light diffusion site at this bottom surface of light guide plate, this step is positioned to be inserted light guide plate before the mould.

9. back light system manufacture method as claimed in claim 6 is characterized in that: this light guide plate material is acryl resin, polycarbonate, polyvinyl resin or clear glass.