CN1641432A - Diffusion plate of direct type backlight module and manufacturing method thereof - Google Patents
Diffusion plate of direct type backlight module and manufacturing method thereof Download PDFInfo
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- CN1641432A CN1641432A CN 200410001041 CN200410001041A CN1641432A CN 1641432 A CN1641432 A CN 1641432A CN 200410001041 CN200410001041 CN 200410001041 CN 200410001041 A CN200410001041 A CN 200410001041A CN 1641432 A CN1641432 A CN 1641432A
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 24
- 229920005989 resin Polymers 0.000 claims abstract description 62
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- 238000001816 cooling Methods 0.000 claims abstract description 26
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 14
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- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
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- 230000005142 aphototropism Effects 0.000 description 57
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Abstract
A direct type backlight module diffusion plate and a manufacturing method thereof. In order to provide a display component and a manufacturing method thereof, wherein the display component can provide light rays with high uniformity and high transmittance, is suitable for different displays, is simple to manufacture and has low cost, the invention provides that a direct type backlight module diffusion plate is positioned above a plurality of light sources; the light source is provided with an incident surface close to the light source and an emergent surface far away from the light source; the incident surface or the emergent surface is provided with a plurality of cylindrical lens surfaces for scattering incident light and dispersing and homogenizing emergent light; the direct type backlight module diffusion plate manufacturing method comprises a resin preparation step, a forming step of extruding and forming resin by an extruder, and a cooling step of cooling and forming the extruded and formed resin by two cooling wheels; at least one of the two cooling wheels in the cooling step has a plurality of cylindrical lens surfaces, so that the resin has a plurality of cylindrical lens surfaces when being formed.
Description
Technical field
The invention belongs to display components, particularly a kind of down straight aphototropism mode set diffuser plate and manufacture method thereof.
Background technology
Module backlight claims backlight again, and its function is to provide the light source of LCD panel, and its light emitting source must possess characteristics such as high brightness and life-span length.Present light source has cold cathode fluorescent lamp (Cold CathodeFluorescent Lamp; CCFL) and hot cathode fluorescent lamp, LED, electroluminescence sheet (EL) etc.Wherein be main flow, and can be divided into two kinds of straight-down negative and side-light types according to light source position with CCFL.
Again, LCD Monitor is the personal information product that closely uses, so brightness is about 250～350nits.For meeting the demand that the TV long distance is viewed and admired, will be then towards the high brightness development of＞500nits.
Because liquid crystal is non-self-luminescent material, therefore must provide light source by Lamp, the light source that product below 20 cun adopts mainly is the sidelight source, improves uniformity of light and luminescence efficiency with light guide plate and brightness enhancement film diaphragms such as (bloomings) again, and employed fluorescent tube number is about 2～8.LCD TV has relatively high expectations to brightness and wide viewing angle characteristic, and therefore, directly-down light source will become the main flow of large-scale Monitor and TV.
Moreover, large LCD application product face was mainly notebook computer (Note Book PC) and LCD monitor (LCD Monitor) in the past, that required module characteristic backlight mainly is is in light weight, volume is little, thin thickness, relatively when exploitation LCD TV used backlight, the important item of being considered then was to have enough video picture brightness (to require 450cd/m at least
2More than), broad visual angle (the sell goods specification can reach 170 degree at present), distinct image contrast (the LCD TV product about 500 1 at present of watching; PDP TV product about 1,000 1) and standardized serviceable life (at present product test value about 60,000 hours).Consider down in above specification, " down straight aphototropism mode set " (Direct Type Back light) just becomes the technology main flow of present collocation large LCD TV, the main concept of its design promptly is to can be in response to the demand of high brightness more, with originally for alleviating side light source that module weight and thickness considers by making after the straight-down negative line source is broken up light evenly it change the technology mode that enters liquid crystal panel behind the planar light source into.
As shown in Figure 1, known down straight aphototropism mode set 1 ' comprise reflecting piece 10 ', several light sources 20 ' and diffuser plate 30 '.
As shown in Figure 2, the route that known diffuser plate inner light source carries out be light enter diffuser plate 30 ' after, when its 32 ' time of several light diffusing agents that touches diffuser plate 30 ' interior, promptly can produce and not have a scattering of directivity, even by light diffusing agent 32 ' absorption.
The down straight aphototropism mode set product technology has following characteristic:
1, all neat degree is lower
Reason is to use the down straight aphototropism mode set product to consider emphasis usually to be the high brightness demand, and the module size then is the consideration point of sacrificing relatively, so the fluorescent tube number becomes many situations that present the light and shade striped that more easily cause and produce, and equal neat degree is had certain influence degree.
2, down straight aphototropism mode set thickness is thicker
Though the fluorescent tube number briliancy that promoted more; the heat energy that fluorescent tube caused also uprises relatively; liquid crystal molecule and the chromatic photoresist high to temperature susceplibility easily cause the secret worry that the color mutation is arranged under the different-colour; therefore down straight aphototropism mode set can be deepened thickness usually, with the arrange in pairs or groups specification requirement of fluorescent tube number and integral brightness of the mode of adjusting depth.
3, luminescence efficiency height
Down straight aphototropism mode set has avoided the sidelight mode to lose part luminous energy in side light leakage, and utilizes aluminium (Al) backboard that spuious luminous energy is reflexed to the video picture exiting surface light, and whole luminous energy efficient is promoted to some extent.
4, the parts kind tails off
As shown in Figure 1, be not difficult to have found obviously to lack the use of the light guide plate of side-light type module backlight, because light guide plate is to utilize lattice point structure on the light guide plate that light is produced the CCFL line source of side or LED pointolite to repeat to export as uniform area light source after the refraction in the function of side-light type module backlight, therefore in down straight aphototropism mode set light by under directly inject, the complanation of its light source only need be finished by diffusion barrier and get final product, and does not need the guiding of light guide plate; Part at blooming (prismatic lens), also can be because of the adding of fluorescent tube number, strengthen briliancy after, can consider the assembling that deducts blooming, cause the limitation at visual angle to avoid blooming that light is converged after concentrating, and influenced the specification requirement of large-scale panel (especially LCD TV) the visual angle.Generally speaking, down straight aphototropism mode set reduces than the kind demand of side-light type module for parts, but CCFL quantity relatively obviously increases.
Down straight aphototropism mode set uses diffuser plate to replace the illuminated light guide plate of side as the critical elements that light is evenly dispersed.Diffuser plate is as the term suggests be to be diffused as main function with light.For example the employed lamp box of X-ray sheet is inspected by advertising lamp box, luminous signboard even hospital, nearly all is to use similar diffuser plate that light is evenly distributed, and on the effect of light diffusion pretty good effect is arranged also.
But, though the diffuser efficiency of early stage diffuser plate meet the requirements, but the penetrance of light and uniformity coefficient still are apparent not enough, and cause it when being applied to display, have the shortcoming of luminance shortage.
Generally speaking, the full light territory penetration of known diffuser plate is between 30～50%, at display under the trend of high brightnessization, do not met request for utilization, in recent years, the diffuser plate manufacturer of Japan improves at these shortcomings one after another, by the kind of adding light diffusing agent change and processing procedure on strictness control down, successful lifting the efficient and the uniformity coefficient of light penetration.Though the penetrance of improvement back diffuser plate has risen to 50～70%, more and more higher for the requirement of penetrance with person's LCD, such penetrance is still gradually and can not meets customer need, and the cost of light diffusing agent is high.
So, so down straight aphototropism mode set becomes only the considering of LCD TV backlight technology, according to the required characteristic of present LCDTV is high evenness and high efficiency smooth diffusion effect, liquid crystal panel is provided stable and uniform light, so the technology of present required research and development is the diffuser plate of high penetration and high diffusibleness.
Therefore, how a kind of manufacture method and structure thereof of diffuser plate of novel down straight aphototropism mode set are proposed at the problems referred to above, not only can improve tradition and insert the shortcoming that too much light diffusing agent causes low penetration rate and low diffusibleness, not be to use the person eagerly to look forward to for a long time always.
Summary of the invention
The purpose of this invention is to provide a kind ofly can provide high evenness and high penetration light, is suitable for different displays, makes simple, that cost is low down straight aphototropism mode set diffuser plate and manufacture method thereof.
Down straight aphototropism mode set diffuser plate of the present invention is positioned at the top of several light sources; It has contiguous light source plane of incidence and with away from the exit facet of light source; The plane of incidence or exit facet are provided with several lens pillar surfaces that makes emergent light dispersion and homogenising so as to making incident light carry out scattering; Down straight aphototropism mode set diffuser plate manufacture method comprises the material preparation step of preparing resin, for the forming step that resin extruded is shaped with extruder and for seeing through the cooling step that two cooling wheels make the resin cooling forming of extrusion molding; In the cooling step in two cooling wheels at least one cooling wheel have several lens pillar surfaces so that have several lens pillar surfaces during ester moulding.
Wherein:
Inside is provided with several light diffusing agents.
Several lens pillar surfaces are arranged at exit facet.
Several lens pillar surfaces are arranged at the plane of incidence and exit facet.
Several lens pillar surfaces that are arranged at the plane of incidence are paralleloscope to setting with several lens pillar surfaces that are arranged at exit facet.
Several lens pillar surfaces that are arranged at the plane of incidence are perpendicular mirrors to setting with several lens pillar surfaces that are arranged at exit facet.
It is for to be made by acryl resin, epoxy resin, PU, transparent heat hardening resin or uv-hardening resin.
A kind of down straight aphototropism mode set diffuser plate manufacture method, it comprises the material preparation step of preparing resin, for seeing through that flat plate mold makes the forming step of ester moulding and for take out the demoulding step that forms the diffuser plate with several lens pillar surfaces in flat plate mold; One of the male model of flat plate mold or master mold have several lens pillar surfaces, and resin monomer carries out the agglomerate polymerization in flat plate mold.
The male model of flat plate mold and master mold all have several lens pillar surfaces.
A kind of manufacture method of down straight aphototropism mode set diffuser plate, it comprises material preparation step, forming step and the demoulding step of preparing resin; Comprise shaping base material step, the preparation first mould step, coating resin step and sclerosis integrating step in the forming step; Shaping base material step is put into resin has several lens pillar surfaces with shaping base material for the mould that will have several lens pillar surfaces; Prepare first mould for mould and base material are formed first mould; Coating resin for resin-coated on first mould; When being hardening of resin, the sclerosis integrating step engages with base material with several lens pillar surfaces; The demoulding forms the diffuser plate with several lens pillar surfaces for taking out in first mould.
Formation has the base material step that repeats to be shaped behind the diffuser plate on several lens pillar surfaces, prepares the second mould step, coating resin step, sclerosis integrating step and demoulding step; Shaping base material step is put into the diffuser plate with several lens pillar surfaces for the mould that will have several lens pillar surfaces, and, all has second base material on several lens pillar surfaces with the shaping two sides with to have phase back sides, several lens pillars surface relative with mould; Prepare second mould for the mould and second base material are formed second mould; Coating resin for resin-coated on second mould; The sclerosis integrating step engages with second base material that the two sides all has several lens pillar surfaces when being hardening of resin; The demoulding forms the diffuser plate that the two sides all has several lens pillar surfaces for taking out in second mould.
Because down straight aphototropism mode set diffuser plate of the present invention is positioned at the top of several light sources; It has contiguous light source plane of incidence and with away from the exit facet of light source; The plane of incidence or exit facet are provided with several lens pillar surfaces that makes emergent light dispersion and homogenising so as to making incident light carry out scattering; Down straight aphototropism mode set diffuser plate manufacture method comprises the material preparation step of preparing resin, for the forming step that resin extruded is shaped with extruder and for seeing through the cooling step that two cooling wheels make the resin cooling forming of extrusion molding; In the cooling step in two cooling wheels at least one cooling wheel have several lens pillar surfaces so that have several lens pillar surfaces during ester moulding.During use, can be with the incident light scattering improving its light uniformity coefficient, and can the light diffusing agent decrement in the down straight aphototropism mode set diffuser plate is few 30～50%, to improve its light transmittance; Manufacture method of the present invention can't increase the complexity of its production, and is of value to the advantage of production; Solved the expensive shortcoming of known techniques in the light diffusing agent of diffuser plate.In sum, the present invention is real in having novelty, progressive and can supplying the industry utilization.High evenness and high penetration light can not only be provided, be suitable for different displays, and manufacturing is simple, cost is low, thereby reach purpose of the present invention.
Description of drawings
Fig. 1, be known down straight aphototropism mode set structural representation front elevation.
Fig. 2, be source light course synoptic diagram in diffuser plate in the known down straight aphototropism mode set.
Fig. 3, for being provided with the down straight aphototropism mode set structural representation front elevation of down straight aphototropism mode set diffuser plate of the present invention.
Fig. 4, be source light course synoptic diagram in down straight aphototropism mode set diffuser plate of the present invention.
Fig. 5, for being provided with the down straight aphototropism mode set structural representation front elevation (several lens pillar surfaces are positioned at exit facet) of down straight aphototropism mode set diffuser plate of the present invention.
Fig. 6, for being provided with the down straight aphototropism mode set structural representation front elevation (several lens pillar surfaces are positioned at the exit facet and the plane of incidence) of down straight aphototropism mode set diffuser plate of the present invention.
Fig. 7, be structural representation stereographic map of the present invention (two sides configuration be several lens pillar surfaces that are parallel to each other).
Fig. 8, be structural representation stereographic map of the present invention (two sides configuration is mutually vertical several lens pillar surfaces).
Fig. 9, for down straight aphototropism mode set diffuser plate manufacturing flow chart of the present invention (extrusion molding).
Figure 10, be down straight aphototropism mode set diffuser plate manufacturing flow chart of the present invention (being shaped) with flat plate mold.
Figure 11, be down straight aphototropism mode set diffuser plate manufacturing flow chart of the present invention (forming first mould of forming with base material and mould).
Embodiment
The present invention is the building block that is used for the down straight aphototropism mode set of LCD TV.As shown in Figure 3, down straight aphototropism mode set (Backlight Module) 10 comprises reflecting piece 120, several light sources 130 and down straight aphototropism mode set diffuser plate 140 of the present invention.Down straight aphototropism mode set diffuser plate 140 of the present invention is positioned at the top of several light sources 130, down straight aphototropism mode set diffuser plate 140 has the plane of incidence 147 of contiguous light source 130 and away from the exit facet 149 of light source 130, its surface has several lens pillars surfaces 142 and inside is provided with several light diffusing agents 146.Can carry out scattering through several lens pillar surfaces 142 of down straight aphototropism mode set diffuser plate 140 of the present invention so that enter the incident light of down straight aphototropism mode set diffuser plate 140 of the present invention, and emergent light is disperseed and homogenising.
As shown in Figure 4, when the incident light 144 that produces when light source 130 enters down straight aphototropism mode set diffuser plate 140 of the present invention with several lens pillar surfaces 142, promptly can make incident light 144 that scattering takes place, see through the light diffusing agent 146 that several make incident light 144 diffusions again, so as to strengthening the effect of incident light 144 diffusions, make emergent light 148 have the effectiveness of diffusion.So see through when down straight aphototropism mode set diffuser plate 140 of the present invention makes entering of incident light 144 down straight aphototropism mode set diffuser plate 140 of the present invention and just produced scattering, see through the effect that light diffusing agent 146 is strengthened its diffusions again.
As Fig. 5, shown in Figure 6, the down straight aphototropism mode set diffuser plate 140 of the present invention that is used for the down straight aphototropism mode set 10 of LCD TV has several lens pillar surfaces 142, and several lens pillar surfaces 142 are positioned at the top of several light sources 130.As shown in Figure 5, several lens pillar surfaces 142 can be positioned at the exit facet 149 of down straight aphototropism mode set diffuser plate 140 of the present invention.As shown in Figure 6, several lens pillar surfaces 142 can be positioned at the plane of incidence 147 and the exit facet 149 of down straight aphototropism mode set diffuser plate 140 of the present invention.
As shown in Figure 3, Figure 4, several lens pillar surfaces 142 of down straight aphototropism mode set diffuser plate 140 of the present invention can be positioned at the plane of incidence 147 or exit facet 149.As Fig. 7, shown in Figure 8, when desire control diffusion light is a certain side's line and carries out scattering, several lens pillar surfaces are be parallel to each other mirror to or the vertical configuration mirror to the two sides that is arranged at down straight aphototropism mode set diffuser plate 140 of the present invention.
Down straight aphototropism mode set diffuser plate of the present invention 140 is for to be made by acryl resin, epoxy resin, PU, transparent heat hardening resin or uv-hardening resin.
As shown in Figure 9, down straight aphototropism mode set diffuser plate manufacture method of the present invention comprises the steps:
Step 1 S500
Get the raw materials ready
Prepare resin;
Step 2 S510
Be shaped
With extruder resin extruded is shaped;
Step 3 S520
Cooling
See through the resin cooling forming that two cooling wheels make extrusion molding.Two cooling wheels comprise at least one cooling wheel and have several lens pillar surfaces, have several lens pillar surfaces when making ester moulding.
As shown in figure 10, down straight aphototropism mode set diffuser plate manufacture method of the present invention comprises the steps:
Step 1 S600
Get the raw materials ready
Prepare resin;
Step 2 S610
Be shaped
See through flat plate mold and make ester moulding; One of the male model of flat plate mold or master mold have several lens pillar surfaces, and resin monomer carries out the agglomerate polymerization in flat plate mold; The male model of flat plate mold and master mold all have several lens pillar surfaces, all have the diffuser plate on several lens pillar surfaces with the shaping two sides.
Step 3 S620
Demoulding
In flat plate mold, take out and form diffuser plate with several lens pillar surfaces.
As shown in figure 11, down straight aphototropism mode set diffuser plate manufacture method of the present invention comprises the steps:
Step 1 S700
Get the raw materials ready
Prepare resin;
Step 2 S710
The shaping base material
The mould that will have several lens pillar surfaces is put into resin has several lens pillar surfaces with shaping base material;
Step 3 S720
Prepare first mould
Mould and base material are formed first mould;
Step 4 S730
Coating resin
With resin-coated on first mould;
Step 5 S740
The sclerosis combination
Engage with base material during hardening of resin with several lens pillar surfaces;
Step S750
The demoulding
Form diffuser plate in first mould, taking out with several lens pillar surfaces.
Down straight aphototropism mode set diffuser plate step of manufacturing with several lens pillar surfaces, two sides is the base material step that repeats to be shaped, the preparation second mould step, coating resin step, sclerosis integrating step and demoulding step after formation has the diffuser plate on several lens pillar surfaces; Shaping base material step is put into the diffuser plate with several lens pillar surfaces for the mould that will have several lens pillar surfaces, and, all has second base material on several lens pillar surfaces with the shaping two sides with to have phase back sides, several lens pillars surface relative with mould; Prepare second mould for the mould and second base material are formed second mould; Coating resin for resin-coated on second mould; The sclerosis integrating step engages with second base material that the two sides all has several lens pillar surfaces when being hardening of resin; The demoulding forms the diffuser plate that the two sides all has several lens pillar surfaces for taking out in second mould.
Down straight aphototropism mode set diffuser plate of the present invention, can be with the incident light scattering to improve its light uniformity coefficient, and can be with the light diffusing agent decrement in the down straight aphototropism mode set diffuser plate few 30～50%, to improve its light transmittance, and by being perpendicular or parallel several lens pillar surfaces that are arranged at the two sides mutually respectively, with the diffusibleness of adjustment light to all directions, and manufacture method of the present invention, can't increase the complexity of its production, and be of value to the advantage of production; Solved the expensive shortcoming of known techniques in the light diffusing agent of diffuser plate.In sum, the present invention is real in having novelty, progressive and can supplying the industry utilization.
Claims (12)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410001041 CN1641432A (en) | 2004-01-16 | 2004-01-16 | Diffusion plate of direct type backlight module and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410001041 CN1641432A (en) | 2004-01-16 | 2004-01-16 | Diffusion plate of direct type backlight module and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN1641432A true CN1641432A (en) | 2005-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410001041 Pending CN1641432A (en) | 2004-01-16 | 2004-01-16 | Diffusion plate of direct type backlight module and manufacturing method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100385310C (en) * | 2004-04-16 | 2008-04-30 | 大日本印刷株式会社 | Diffusion plate, surface light source device and transmissive display device |
| CN100401158C (en) * | 2005-09-05 | 2008-07-09 | 奇菱科技股份有限公司 | Polymer optical element with micro-pattern and manufacturing method thereof |
| CN101285902B (en) * | 2007-04-11 | 2010-05-26 | 颖台科技股份有限公司 | Diffusion plate group |
| CN101470301B (en) * | 2007-12-28 | 2010-08-25 | 财团法人工业技术研究院 | Composite light guide film module |
| US7911700B2 (en) | 2007-10-04 | 2011-03-22 | Industrial Technology Research Institute | Light guiding film |
| US7940461B2 (en) | 2006-08-14 | 2011-05-10 | Industrial Technology Research Institute | Optical diffusion module |
| CN101135739B (en) * | 2006-09-01 | 2011-08-31 | 颖台科技股份有限公司 | Diffusion plate with multiple aspheric surface structures |
| US8460585B2 (en) | 2006-08-30 | 2013-06-11 | Industrial Technology Research Institute | Method of forming an optical diffusion module |
| US8690373B2 (en) | 2006-11-15 | 2014-04-08 | 3M Innovative Properties Company | Back-lit displays with high illumination uniformity |
| CN109633806A (en) * | 2019-02-25 | 2019-04-16 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN110275349A (en) * | 2018-03-13 | 2019-09-24 | 苹果公司 | Displays with direct-lit backlight units |
| CN115657177A (en) * | 2022-11-24 | 2023-01-31 | 四川龙华光电薄膜股份有限公司 | A kind of diffusion membrane and the preparation method of diffusion membrane |
-
2004
- 2004-01-16 CN CN 200410001041 patent/CN1641432A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100385310C (en) * | 2004-04-16 | 2008-04-30 | 大日本印刷株式会社 | Diffusion plate, surface light source device and transmissive display device |
| CN100401158C (en) * | 2005-09-05 | 2008-07-09 | 奇菱科技股份有限公司 | Polymer optical element with micro-pattern and manufacturing method thereof |
| US7940461B2 (en) | 2006-08-14 | 2011-05-10 | Industrial Technology Research Institute | Optical diffusion module |
| US8460585B2 (en) | 2006-08-30 | 2013-06-11 | Industrial Technology Research Institute | Method of forming an optical diffusion module |
| CN101135739B (en) * | 2006-09-01 | 2011-08-31 | 颖台科技股份有限公司 | Diffusion plate with multiple aspheric surface structures |
| US8690373B2 (en) | 2006-11-15 | 2014-04-08 | 3M Innovative Properties Company | Back-lit displays with high illumination uniformity |
| CN101285902B (en) * | 2007-04-11 | 2010-05-26 | 颖台科技股份有限公司 | Diffusion plate group |
| US7911700B2 (en) | 2007-10-04 | 2011-03-22 | Industrial Technology Research Institute | Light guiding film |
| CN101470301B (en) * | 2007-12-28 | 2010-08-25 | 财团法人工业技术研究院 | Composite light guide film module |
| CN110275349A (en) * | 2018-03-13 | 2019-09-24 | 苹果公司 | Displays with direct-lit backlight units |
| US11221512B2 (en) | 2018-03-13 | 2022-01-11 | Apple Inc. | Displays with direct-lit backlight units and color conversion layers |
| CN110275349B (en) * | 2018-03-13 | 2022-08-30 | 苹果公司 | Display with direct-lit backlight unit |
| CN109633806A (en) * | 2019-02-25 | 2019-04-16 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN115657177A (en) * | 2022-11-24 | 2023-01-31 | 四川龙华光电薄膜股份有限公司 | A kind of diffusion membrane and the preparation method of diffusion membrane |
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