CN107272261A - A kind of diffusion barrier and preparation method thereof - Google Patents
A kind of diffusion barrier and preparation method thereof Download PDFInfo
- Publication number
- CN107272261A CN107272261A CN201710630323.2A CN201710630323A CN107272261A CN 107272261 A CN107272261 A CN 107272261A CN 201710630323 A CN201710630323 A CN 201710630323A CN 107272261 A CN107272261 A CN 107272261A
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- Prior art keywords
- coating
- diffusion barrier
- particle
- base material
- optical surface
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Dispersion Chemistry (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The present invention provides a kind of diffusion barrier and preparation method thereof, and the diffusion barrier includes base material, face-coating and back coating, it is characterised in that：The back coating includes glue, auxiliary agent and particle, and the TG (glass transition temperature) of glue described in the back coating is less than 100 DEG C；Particle density is more than 250ea/mm in the back coating2, the diffusion barrier collocation planar lightguide that the present invention is provided reaches preferable scratch resistant effect by controlling glue type and particle density.
Description
Technical field：
The present invention relates to optical film field, and in particular to diffusion barrier and preparation method thereof.
Background technology：
LCD Display Techniques are Display Techniques most widely used at present, are widely applied to TV, mobile phone, computer, pad, display
Device etc..In an lcd, diffusion barrier is important part.In LCD backlight module, including lamp source, glue frame, reflector plate, lead
Tabula rasa, diffusion barrier, prismatic lens etc..The effect of diffusion barrier is that the spot light that lamp source is sent is changed into area source.Diffusion barrier is divided into
Diffusion barrier and lower diffusion barrier.Diffusion barrier, using resin as skeleton, diffusion particle is uniformly arranged mainly using base material as carrier, is come
Reach the effect of disperse light.
Because application is different, the design of backlight module is not quite similar.For the ease of narration, diffusion barrier is abbreviated as D, by rib
Eyeglass is abbreviated as P.The structure included in backlight module has：D+P+P+D, D+P+D, D+D, D+P+P, P+D+D.By above
Structure can be seen that diffusion barrier touch light guide plate probability it is very high.
The material of light guide plate include makrolon (PC), polymethyl methacrylate (PMMA), MS materials are (with metering system
Sour methyl esters MMA and styrene SM are raw material).Have the site printed on light guide plate, light by site refraction so that point
Light source is changed into area source.
The backlight module assembled, exists between diaphragm and the relative motion between diaphragm and light guide plate in transportation.
In relative movement, if the hardness of the two, pattern are improper, scratch can be produced, the position of scratch is likely to occur in leaded light
Plate or diaphragm adjacent thereto, after scratch is produced, have considerable influence to the effect of display, can produce point-like or wire is bad.
In actual production process, the performance evaluated between diaphragm and light guide plate is often determined using vibration test.Vibrations
Test is often carried out using vibrations board, simulates transportation.
The mode of control scratch at present includes in the following manner：
1. reaching scratch resistant purpose by controlling cleanliness factor, the gap between light guide plate and diaphragm is smaller, therefore diaphragm
Small foreign matter between light guide plate can cause more serious scratch.
2. reaching improvement purpose by improving diaphragm, scratch degree is controlled by adding flexible particle.
3. diaphragm is reduced by improving the adhesive force of diaphragm falls considering to be worth doing property, so as to improve cleannes between diaphragm.
4. reaching the purpose of masking scratch by using the preferable diaphragm of shielding, but it is to sacrifice briliancy as cost
's.
5. by improving light guide plate, anti-scraping coating is coated with light guide plate, so as to reach scratch resistant purpose.
6. by designing light guide board microstructure, the contact area between light guide plate and diaphragm is reduced, in addition the chip between diaphragm
It can be received by the micro-structural of light guide plate, so as to buffer the abrasion of diaphragm and light guide plate.
The starting point of above all of measure is substantially from the cleannes between control diaphragm and light guide plate, or buffer film
Abrasion between piece and light guide plate, control cleannes deliberately, the requirement to composing room is higher, and production is had certain limitations.It is single
Solely add flexible particle improvement be not it is obvious that the cost for improving light guide plate is higher, have structured light guide plate nor
Current trend.
The content of the invention：
It is an object of the invention to provide a kind of diffusion barrier, by controlling glue type, particle types, particle size, particle
Density has preferable scratch resistant effect to diaphragm to reach.
On the other hand a kind of preparation method of diffusion barrier is provided.
To achieve the above object, the technical scheme is that：
A kind of diffusion barrier, including base material, face-coating and back coating, it is characterised in that：The back coating includes glue
Water, auxiliary agent and particle, the Tg (glass transition temperature) of glue described in the back coating are less than 100 DEG C；Grain in back coating
Sub- density is more than 250ea/mm2, the glue is selected from heat curing-type glue and UV glue.The main function of glue is fixed tablet
Son, protection particle, scratch resistance, anti-absorption, antistatic and other effects are reached so that overall, the size matching of particle, material collocation with
And particle density has on scratch resistance and very significantly influenceed.The collocation of particle and glue has on scratch resistance obviously influences module to exist
During vibrations, the corresponding squeezing action by external force of diffusion back coated surface, can when film surface by force intensity more than its deformation intensity
The back of the body can be caused to apply the broken of particle, diaphragm scratch, the particle come off is moved in the space relaying reforwarding of diaphragm and light guide plate, so as to lead
Cause more serious light guide plate, diaphragm scratch, using the softer glue of material, it is relative be selection Tg (glass transition temperature) points compared with
Low glue, can increase the deformability of glue-line to a certain degree, i.e., compression strength strengthens, even and if vibrations process mesoglea first break
Split, because its is softer, the abrasion to particle is weaker, what another aspect was caused to light guide plate, which frays, can also mitigate, the grain of diffusion barrier
Sub- density has considerable influence to scratch light guide plate, and proper density increase can improve contact area, and different-grain diameter collocation is also to increase
Plus contact area, reduce stress.
Further, the base material includes the first optical surface and the second optical surface, first optical surface and described second
Optical surface is provided with precoated shet.
Further, the particle is selected from PMMA, PBMA, PU, PS, nylon, organosilicon and melamine.
Further, described base material is selected from optical grade PET film, and the thickness range of the PET film is 100-250 μ
m。
Further, described face-coating includes acrylic resin, retarder thinner, diffusion particle, dispersant, levelling agent
And curing agent.
Further, one or more of the described diffusion particle in PMMA, PBMA, PS and nylon.
Further, described diffusion particle average grain diameter in 5 μm, 10 μm, 15 μm and 20 μm at least two mix
Conjunction is used.
A kind of preparation method for including above-mentioned diffusion barrier, is comprised the following steps：
S1, the preparation of the diffusion barrier face-coating：Base material is unreeled to head region is applied, and the base material includes the first optical surface
With the second optical surface, by face-coating coating liquid in the first optical surface of base material, wind, contained after drying
The diffusion barrier semi-finished product of face-coating；
S2, the preparation of the diffusion barrier back coating：Diffusion barrier semi-finished product A described in step S1 is unreeled to painting head region,
By back coating coating liquid in after the second optical surface of base material, solidify by dry and UV, in the second optics of base material
Surface forms back coating.
Further, the face-coating coating fluid includes diffusion particle, diluent, acrylic resin, dispersant, solidification
Agent；The back coating coating fluid comprising particle, diluent, Tg be less than 100 DEG C acrylic resin, levelling agent, antistatic additive,
Initiator.
Further, before face-coating and/or back coating is prepared, in first optical surface and second light
Face is coated with precoated shet.
Beneficial effect：
This patent diffusion barrier collocation planar lightguide, by controlling glue type, particle types, particle size, particle close
Degree has preferable scratch resistant effect to light guide plate to reach
Brief description of the drawings：
With reference to Fig. 1 and embodiment, the present invention is further described.
Fig. 1 shows a kind of typical diffusion barrier of the present invention, including face-coating 1, precoated shet 2, base material 3, back coating
4, diffusion particle 5, particle 6.
Embodiment：
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
Invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.
The preparation of comparative example diffusion barrier：
S1, the preparation of diffusion barrier face-coating：188 μm of the PET base material containing precoated shet is unreeled to head region is applied, described
Base material includes the first optical surface and the second optical surface, will include diffusion particle, diluent, acrylic resin modified, levelling
The coating fluid gravure roll application that agent, dispersant, curing agent are mixed is in the first optical surface of base material, with 15-35m/min speed
Degree, by drying oven solvent flashing, winding obtains the diffusion barrier semi-finished product containing face-coating.
S2, the preparation of the diffusion barrier back coating：Above-mentioned diffusion barrier semi-finished product B is unreeled to head region is applied, will be included
The coating liquid that the acrylic resin of particle, diluent, Tg less than 100 DEG C, levelling agent, antistatic additive, initiator are mixed
In after the second optical surface of base material, with 20-40m/min speed, by drying oven solvent flashing, by UV lamp, in base material
The second optical surface formation back coating 4, finally wind.
The preparation of diffusion barrier 100 shown in Fig. 1：
The preparation of diffusion barrier face-coating：188 μm of the PET base material 3 containing precoated shet (primer) 2 is unreeled to painting Head Section
Domain, the base material 3 includes the first optical surface and the second optical surface, will include diffusion particle 5, diluent, modified acroleic acid
The coating fluid gravure roll application that resin, levelling agent, dispersant, curing agent are mixed is in the first optical surface of base material, with 15-
35m/min speed, by drying oven solvent flashing, winding obtains the diffusion barrier semi-finished product containing face-coating 1.
S2, the preparation of the diffusion barrier back coating：Above-mentioned diffusion barrier semi-finished product are unreeled to head region is applied, grain will be included
The coating liquid that the acrylic resin, levelling agent, antistatic additive, initiator that son 6, diluent, TG are less than 100 DEG C are mixed in
After second optical surface of base material 3, with 20-40m/min speed, by drying oven solvent flashing, by UV lamp, in base material
Second optical surface formation back coating 4, finally winds.
Following table is the concrete component of embodiment：
The product of comparative example 1 cures 24h in 50 DEG C of curing chamber, after the completion of test data, vibration test is：(D+P+D is tied
Structure).
| Physical property | Data |
| Haze% | 93.45 |
| T.t.% | 85.42 |
| Particle density ea/mm2 | 245 |
| Pencil hardness/H | 2H |
| The back of the body applies wear-resisting/g | >600g |
| Vibration test | Cover OK, slight scratch light guide plate under cell states |
The product of comparative example 2 cures 24h in 50 DEG C of curing chamber, after the completion of test data, vibration test is：(D+P+P+D
Structure).
| Physical property | data |
| Haze/% | 94.65 |
| T.t./% | 84.97 |
| Particle density ea/mm2 | 240 |
| Pencil hardness/H | 2H |
| Wear-resisting/g | >600g |
| Vibration test | Cover NG, scratch light guide plate under cell states |
The product of embodiment 1 cures 24h in 50 DEG C of curing chamber, after the completion of test data, vibration test is：(D+P+D is tied
Structure).
| Physical property | Data |
| Haze% | 93.40 |
| T.t.% | 86.21 |
| Particle density ea/mm2 | 260 |
| Pencil hardness/H | 2H |
| Wear-resisting/g | >600g |
| Vibration test | Point at OK under cell states, 2 is covered to scrape |
The product of embodiment 2 cures 24h in 50 DEG C of curing chamber, after the completion of test data, vibration test is：(D+P+P+
D) structure.
| Physical property | Data |
| Haze% | 94.21 |
| T.t.% | 84.32 |
| Particle density ea/mm2 | 280 |
| Pencil hardness/H | 2H |
| Wear-resisting/g | >600g |
| Vibration test | OK |
The product of embodiment 3 cures 24h in 50 DEG C of curing chamber, after the completion of test data, vibration test is：(P+P+D is tied
Structure).
| Physical property | Data |
| Haze/% | 96.32 |
| T.t./% | 83.21 |
| Particle density ea/mm2 | 320 |
| Pencil hardness/H | 2H |
| Wear-resisting/g | >600g |
| Vibration test | OK |
From above-mentioned comparative example and embodiment：By controlling glue type, particle types, particle size, particle density
There is preferable scratch resistant effect to diaphragm to reach.
The foregoing is only the preferred embodiment of invention, be not intended to limit the present invention, it is all the spirit and principles in the present invention it
Interior made modifications, equivalent substitutions and improvements etc., should be included in the scope of the protection.Attempt according to this to the present invention
Make any formal limitation, therefore all have any modification or change for making the relevant present invention under identical spirit,
It should all be included in that the invention is intended to the category protected.
Claims (10)
1. a kind of diffusion barrier (100), including base material (3), face-coating (1) and back coating (4), it is characterised in that：The back of the body
Finishing coat (4) includes glue, auxiliary agent and particle (6), the Tg (glass transition temperature) of glue described in the back coating (4)
Less than 100 DEG C；Particle (6) density is more than 250ea/mm in the back coating (4)2。
2. a kind of diffusion barrier (100) according to claim 1, it is characterised in that the base material (3) includes the first optical surface
With the second optical surface, first optical surface and second optical surface are provided with precoated shet (2).
3. a kind of diffusion barrier (100) according to claim 1, it is characterised in that the particle (6) is selected from polymethyl
Sour methyl esters (PMMA), Vinalac 5920 (PBMA), polystyrene (PS), nylon (Nylon), polyurethane (PU) has
Machine silicon and melamine.
4. diffusion barrier (100) according to claim 1, it is characterised in that described base material (3) is selected from optical grade PET film,
The thickness range of the optical grade PET film is 100-250 μm.
5. diffusion barrier (100) according to claim 1, it is characterised in that described face-coating (1) includes acrylic acid tree
Fat, retarder thinner, diffusion particle, dispersant, levelling agent and curing agent.
6. diffusion barrier (100) according to claim 5, it is characterised in that described diffusion particle (5) be selected from PMMA,
One or more in PBMA, PS and nylon.
7. diffusion barrier (100) according to claim 5, it is characterised in that described diffusion particle (5) average grain diameter is selected from
At least two in 5 μm, 10 μm, 15 μm and 20 μm are used in mixed way.
8. one kind includes the preparation method of any one of the claim 1-7 diffusion barrier (100), it is characterised in that comprising as follows
Step：
S1, the preparation of the diffusion barrier face-coating：Base material (3) is unreeled to head region is applied, and the base material (3) includes the first optics
Face and the second optical surface, by face-coating coating liquid in the first optical surface of base material, wind after drying, are contained
There is the diffusion barrier semi-finished product A of face-coating (1)；
S2, the preparation of the diffusion barrier back coating：Diffusion barrier semi-finished product A described in step S1 is unreeled to head region is applied, will be carried on the back
Topcoat coating fluid is coated on after the second optical surface of base material (3), is solidified by dry and UV, in the second light of base material (3)
Learn surface and form back coating (4).
9. preparation method according to claim 8, it is characterised in that the face-coating coating fluid includes diffusion particle
(5), diluent, acrylic resin, dispersant, curing agent；The back coating coating fluid is small comprising particle (6), diluent, TG
In 100 DEG C of acrylic resin, levelling agent, antistatic additive, initiator.
10. preparation method according to claim 8, it is characterised in that prepare face-coating and/or back coating it
Before, in first optical surface and second optical surface coating precoated shet (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710630323.2A CN107272261A (en) | 2017-07-28 | 2017-07-28 | A kind of diffusion barrier and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710630323.2A CN107272261A (en) | 2017-07-28 | 2017-07-28 | A kind of diffusion barrier and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107272261A true CN107272261A (en) | 2017-10-20 |
Family
ID=60075328
Family Applications (1)
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|---|---|---|---|
| CN201710630323.2A Pending CN107272261A (en) | 2017-07-28 | 2017-07-28 | A kind of diffusion barrier and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907926A (en) * | 2017-12-28 | 2018-04-13 | 深圳大学 | A kind of light diffusing sheet and preparation method |
| CN107942420A (en) * | 2017-11-29 | 2018-04-20 | 宁波激智科技股份有限公司 | A kind of diffusion barrier for improving the anti-ball falling impact of light guide plate and preparation method thereof |
| CN109633800A (en) * | 2018-03-30 | 2019-04-16 | 张家港康得新光电材料有限公司 | A kind of diffusion barrier and optical film |
| WO2021143619A1 (en) * | 2020-01-16 | 2021-07-22 | 京东方科技集团股份有限公司 | Display device |
| CN114815022A (en) * | 2022-04-12 | 2022-07-29 | 凯鑫森(上海)功能性薄膜产业股份有限公司 | High-shielding double-sided diffusion film and preparation method thereof |
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Application publication date: 20171020 |
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| WD01 | Invention patent application deemed withdrawn after publication |