CN102529026A

CN102529026A - Light guide plate cavity insert, method for manufacturing light guide plate and light guide plate

Info

Publication number: CN102529026A
Application number: CN2010106112939A
Authority: CN
Inventors: 许嘉麟
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Zhuhai Branch Photoelectric Co Ltd
Priority date: 2010-12-29
Filing date: 2010-12-29
Publication date: 2012-07-04
Anticipated expiration: 2030-12-29
Also published as: CN102529026B

Abstract

The invention relates to a light guide plate cavity insert, which comprises a forming surface, a plurality of lattice point recesses which are positioned on the forming surface and are formed by processing the forming surface by laser and at least one atomized area which is formed on a bottom surface and is formed by processing the forming surface by sand blasting, wherein the forming surface is used for forming a reflecting surface of the light guide plate; at least one atomized area comprises a plurality of micro lattice point recesses; and the density of the micro lattice point recesses is greater than that of the lattice point recesses within the same unit area. The invention also relates to a method for manufacturing the light guide plate and the light guide plate manufactured by the method.

Description

Light guiding board mould core, method for manufacturing light guide plate and LGP

Technical field

The present invention relates to a kind of light guiding board mould core, a kind of method for manufacturing light guide plate and a kind of LGP.

Background technology

Because liquid crystal can not self-luminous, therefore, LCD generally need comprise the backlight module that light source is provided to liquid crystal panel.And the key component in the backlight module is a LGP, and LGP is the assembly that spot light or line source is converted into area source, and LGP goes out the quality that uniformity of light directly influences backlight module.

At present, the method for making LGP is a jet forming method, is specially, and the die that will have optical texture is fixed in the die cavity of mould, and the moulding material of melting is injected in the die cavity of mould, after the cooling, the formed body in the die cavity is ejected just process LGP.The optical texture of die is transferred to the reflecting surface of LGP.Therefore, the design of die optical texture directly influences the light-emitting uniformity of LGP.

Summary of the invention

In view of this, be necessary to provide a kind of light guiding board mould core and a kind of method for manufacturing light guide plate and a kind of LGP, it all can improve the light-emitting uniformity of this LGP.

A kind of light guiding board mould core; It comprises forming surface, be positioned on this forming surface by this forming surface of Laser Processing formed a plurality of sites depression and be positioned on this bottom surface by formed at least one the atomizing zone of this forming surface of sandblast processing; This forming surface is used for the reflecting surface of formed light conductive plate; This at least one atomizing zone comprises a plurality of microgrid point depressions, and in the same unit are, the density of this microgrid point depression is bigger than the density of this site depression.

A kind of method for manufacturing light guide plate, it comprises:

Above-mentioned light guiding board mould core is provided;

This light guiding board mould core is fixed in the mould;

Injection moulding material in this mould;

Cool off this moulding material in this mould; And

The demoulding is to obtain LGP.

A kind of LGP; It is by making like above-mentioned method for manufacturing light guide plate; This LGP comprises reflecting surface and is positioned at a plurality of sites on this reflecting surface and is positioned at least one the atomizing zone on this reflecting surface; This at least one atomizing zone comprises a plurality of microgrid points, and in the same unit are, the density of this microgrid point is bigger than the density of this site.

Light guiding board mould core provided by the invention; It is provided with the different lattice point structures of being processed by different processing methods that reach of density in forming surface; When making the LGP homogenizing light that utilizes this die manufacturing; Can utilize low density lattice point structure that light is carried out thick homogenizing and utilize the high lattice point structure of density that light is carried out thin homogenizing and eliminates blanking bar, and then improve the light-emitting uniformity of LGP.

Description of drawings

The schematic perspective view of a kind of light guiding board mould core that Fig. 1 provides for first embodiment of the invention.

Fig. 2 is the graph of a relation of sandblast parameter that utilizes the light guiding board mould core of sandblast processing procedure manuscript 1.

Fig. 3 is another graph of a relation of sandblast parameter that utilizes the light guiding board mould core of sandblast processing procedure manuscript 1.

Fig. 4 is the schematic cross-section of mould that utilizes the die formed light conductive plate of Fig. 1.

The schematic perspective view of a kind of LGP that Fig. 5 provides for second embodiment of the invention.

Fig. 6 is the Luminance Distribution sketch map of exiting surface of the LGP of Fig. 5.

Fig. 7 is the Luminance Distribution sketch map of the exiting surface of another LGP of comparing with the LGP of Fig. 5.

The main element symbol description

Light guiding board mould core 100

Forming surface 12

Site depression 14

Atomizing zone 16

First side 17

Second side 18

Mould 200

Cover half 21

Dynamic model 22

Sprue 25

Runner 26

Cast gate 24

Die cavity 23

LGP 300

Incidence surface 31

Exiting surface 32

Reflecting surface 33

Side 34

Optical design structure 35

Site 351

Atomizing zone 352

The specific embodiment

To combine below graphic the present invention to be done further explain.

See also Fig. 1, a kind of light guiding board mould core 100 that first embodiment of the invention provides comprises forming surface 12, is positioned at a plurality of sites depression 14 on the forming surface 12 and is positioned at two atomizing zones 16 on the forming surface 12.

The material of this light guiding board mould core 100 is a stainless steel.This forming surface 12 is a minute surface, and it is used for the reflecting surface 33 (bottom surface, ginseng Fig. 5) of formed light conductive plate 300.

This a plurality of sites depression 14 is to be formed by 12 of this forming surface of Laser Processing.This first side 17 and this second side 18 are positioned at the opposing both sides of this light guiding board mould core 100.

In this embodiment, the surface roughness in each atomizing zone 16 is the 0.5-0.7 micron.This atomizing zone 16 is to be formed by this forming surface of sandblast processing.Atomizing zone 16 comprises a plurality of microgrid point depressions.The surface roughness in atomizing zone 16 is big more, and the density of microgrid point depression is high more.In the same unit are, the density of this microgrid point depression is bigger than the density of this site depression 14.

Two atomizing zones 16 are two corners that lay respectively near the light guiding board mould core 100 of second side 18.This atomizing zone 16 surrounds some sites depression 14 of this a plurality of sites depression 14.

The main adjustable parameter of sandblast processing procedure comprises sand-blast material, jetting height, (ginseng tables 1) such as scan spacing (nozzle moving interval), nozzle translational speed and expulsion pressures.At this; The target workpiece is the light guiding board mould core 100 of steel; So sand-blast material is selected the bigger carborundum (SiC) of cutting force, the transcription property of the reflecting surface pattern of LGP 300 is not good when avoiding microgrid point cup depth deficiency because of the zone 16 that atomizes to make ejection formation.Jetting height control effectively circle footpath scope also influence simultaneously suitably scan the selection of spacing, take suitable height and spacing and preset parameter, the collocation through speed and pressure obtains required roughness.

Table 1 sandblast parameter

Below be variable with expulsion pressure and nozzle translational speed respectively just, and fixing other parameter is as an example, obtain surface roughness respectively with the graph of a relation of expulsion pressure and nozzle translational speed.

Example 1: preset parameter comprises sand-blast material: SiC; Nozzle height: 150mm; Translational speed: 150mm/s; And nozzle moving interval (Pitch): 5mm.The graph of a relation of resultant surface roughness and expulsion pressure please be joined Fig. 2.

Example 2: preset parameter comprises sand-blast material: SiC; Nozzle height 150mm; Expulsion pressure: 3MPa; Nozzle moving interval: 5mm.The graph of a relation of resultant surface roughness and nozzle translational speed please be joined Fig. 3.Therefore, through the control above-mentioned parameter, can make the surface roughness in required atomizing zone 16.

Please join Fig. 4, when utilizing this die 100 to make LGP 300, this die 100 is fixed in the mould 200.Particularly, this mould 200 comprises cover half 21 and dynamic model 22, and light guiding board mould core 100 is fixed on the diapire of dynamic model 22.Wherein, on cover half 21, be formed with the sprue 25 and the runner 26 that supply molten resin (moulding material) to flow into, this runner 26 is big to the tapered change in dynamic model 22 1 lateral sections.At the faying face of cover half 21 with dynamic model 22, form cast gate 24 along two

moulds

21,22, cast gate 24 is communicated with runner 26.Engage with dynamic model 22 through cover half 21, be formed for the die cavity 23 of LGP shaping usefulness, die cavity 23 all is communicated with above-mentioned cast gate 24, runner 26 and sprue 25.When making LGP, the resin of fusion is like polymethyl methacrylate (PMMA); Get into die cavity 23 through sprue 25, runner 26 and cast gate 24; When the enclosure space of die cavity 23 is full of by the mobile molten resin that injects, pass through refrigerating work procedure again, open dynamic model 22; Utilize ejecting mechanism (figure does not show) to make the LGP demoulding that has been shaped, can obtain plate shaped LGP 300 as shown in Figure 5.

This LGP 300 comprises incidence surface 31, exiting surface 32, reflecting surface 33, side 34 and optical design structure 35.This incidence surface 31 connects this exiting surface 32 and this reflecting surface 33, and this side 34 connects this exiting surface 32 and this reflecting surface 33.This incidence surface 31 and this side 34 are positioned at the opposing both sides of LGP 300.This optical design structure 35 is positioned on this reflecting surface 33.This optical design structure 35 and this reflecting surface 33 are by 100 moulding of light guiding board mould core, and this optical design structure 35 comprises a plurality of sites 351 and two atomizing zones 352.A plurality of sites 351 are by 14 moulding of a plurality of site depression on the forming surface 12 of light guiding board mould core 100, and atomizing zone 352 is by 16 moulding in zone of the atomizing on the forming surface 12 of light guiding board mould core 100.The surface roughness in two atomizing zones 352 is the 0.5-0.7 micron, and it lays respectively at 300 two corners of LGP near side 34.Atomizing zone 352 comprises a plurality of microgrid points.In the same unit are, the density of this microgrid point is bigger than the density of this site 351, like big 10-100 doubly.

Please join Fig. 6 to Fig. 7, the intensity map of the exiting surface 32 of the LGP 300 that Fig. 6 provides for this embodiment, A representes incidence surface 31 sides, B representes side 34 sides opposing with incidence surface 31.Fig. 7 is not provided with the intensity map of LGP exiting surface of the light guiding board mould core institute moulding in atomizing zone 16 on forming surface 12 for utilization, A1 representes the incidence surface side, and B1 representes the side opposing with incidence surface.The intensity map of exiting surface can be by brightness instrumentation amount.

In the intensity map among Fig. 7, the minimum brightness that measures is 4695cd/m2, and maximum brightness is 6156cd/m2, and the luminance difference value of maximum brightness and minimum brightness is 1461, and the uniformity (uniformity=minimum brightness/maximum brightness) is 76.27%.In the intensity map among Fig. 6, the minimum brightness that measures is 4746cd/m2, and maximum brightness is 5646cd/m2, and the luminance difference value of maximum brightness and minimum brightness is 900, and the uniformity (uniformity=minimum brightness/maximum brightness) is 84.05%.Know that by above the LGP of this embodiment 300 significantly promotes outgoing light homogeneity, can be with light outgoing more equably.

Light guiding board mould core 100 provided by the invention; It is different and by the formed lattice point structure of different processing methods that it is provided with density in forming surface 12; When making the LGP 300 homogenizing light that utilize these die 100 manufacturings; Can utilize 351 pairs of light of low density lattice point structure to carry out thick homogenizing and utilize 352 pairs of light of the high lattice point structure of density to carry out thin homogenizing and eliminate blanking bar, and then improve the light-emitting uniformity of LGP 300.

In addition, those skilled in the art can also do other variation in spirit of the present invention.Certainly, these all should be included within the present invention's scope required for protection according to the variation that the present invention's spirit is done.

Claims

1. light guiding board mould core; It is characterized in that; This die comprises forming surface, be positioned on this forming surface by this forming surface of Laser Processing formed a plurality of sites depression and be positioned on this bottom surface by formed at least one the atomizing zone of this forming surface of sandblast processing, and this forming surface is used for the reflecting surface of formed light conductive plate, and this at least one atomizing zone comprises that a plurality of microgrid points cave in; In the same unit are, the density of this microgrid point depression is bigger than the density of this site depression.

2. light guiding board mould core as claimed in claim 1 is characterized in that, the surface roughness in this at least one atomizing zone is the 0.5-0.7 micron.

3. light guiding board mould core as claimed in claim 1 is characterized in that, this at least one atomizing zone surrounds some sites depression of this a plurality of sites depression.

4. method for manufacturing light guide plate, it comprises:

Light guiding board mould core as claimed in claim 1 is provided;

This light guiding board mould core is fixed in the mould;

Injection moulding material in this mould;

Cool off this moulding material in this mould; And

The demoulding is to obtain LGP.

5. method for manufacturing light guide plate as claimed in claim 4 is characterized in that, the surface roughness in this at least one atomizing zone is the 0.5-0.7 micron.

6. LGP; Its improvement is; This LGP is made by method for manufacturing light guide plate as claimed in claim 5, and this LGP comprises reflecting surface and be positioned at a plurality of sites on this reflecting surface and be positioned at least one the atomizing zone on this reflecting surface that this at least one atomizing zone comprises a plurality of microgrid points; In the same unit are, the density of this microgrid point is bigger than the density of this site.

7. LGP as claimed in claim 6; It is characterized in that this LGP also comprises incidence surface, exiting surface and side, this incidence surface connects this exiting surface and this reflecting surface; This side connects this exiting surface and this reflecting surface, and this incidence surface and this side are positioned at the opposing both sides of this LGP.

8. LGP as claimed in claim 7 is characterized in that, with respect to this incidence surface, this at least one atomizing zone is near this side.