CN101386772B - Photosensitive binder for liquid crystal display - Google Patents
Photosensitive binder for liquid crystal display Download PDFInfo
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- CN101386772B CN101386772B CN 200710154236 CN200710154236A CN101386772B CN 101386772 B CN101386772 B CN 101386772B CN 200710154236 CN200710154236 CN 200710154236 CN 200710154236 A CN200710154236 A CN 200710154236A CN 101386772 B CN101386772 B CN 101386772B
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- liquid crystal
- crystal display
- photosensitive binder
- reactive monomer
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Abstract
The invention relates to a photosensitive adhesive for a flexible liquid crystal display, which comprises an amino formic ester oligomer, a reactive monomer containing a phenyl group, and a photo initiator. The adhesive has good shearing strength and anti-stripping strength, and can also further reduce the driving voltage of the liquid crystal display.
Description
[technical field]
The present invention relates to a kind of photosensitive binder, particularly a kind of photosensitive binder for liquid crystal display.
[background technology]
The characteristics such as bendable liquid crystal display (flexible liquid crystal display) is frivolous owing to possessing, portable, economize the energy and processing procedure is simple and easy, cost is low come into one's own gradually.In addition, reflective liquid-crystal display becomes the cumulative display element of demand in information tool, as E-book or PDA etc. because possessing low power consumption and frivolous characteristic.Therefore, the reflective bendable liquid crystal display in conjunction with bendable substrate and reflective liquid-crystal display becomes one of emphasis of display development in the future especially.
Utilize plastic base (also being called flexible base, board) to form flat-panel screens, but except use the display of glass substrate to have the advantages such as lighter, thinner, shock-resistant, difficult broken curved surface demonstration and coiling property than tradition, also can utilize continuation mode (roll-to-roll) production, therefore can significantly reduce production costs, therefore become the development trend of following display of new generation.Yet, still have at present the restriction of many process conditions still need overcome and the character of plastic material still need be improved, just can make plastic base import in the processing procedure of flat-panel screens comprehensively and replace glass substrate.
It is namely that the cementing agent that does not have to be fit to can use that present flexible display suffers from one of great problem, the sealant that conventional liquid crystal is used (sealant) is not suitable for the plastic base of flexible, often cause flexible display to have the uneven problem of even peeling off of liquid crystal cells spacing (cell gap) when deflection, cause the quality of display to be affected, even can't use.
Therefore, the exploitation of cementing agent has become one of the material of flexible display key and technology.The present invention namely wishes via Molecular Design, adjust the composition of the cementing agent that bendable substrate uses, the photosensitive binder of a kind of high bond strength (for example: coat the capsule of liquid crystal and the cohesive strength between substrate), low driving voltage is provided with expectation.
[summary of the invention]
The invention provides the photosensitive binder that a kind of liquid crystal display is used, this photosensitive binder forms and makes itself and capsule and substrate of coating liquid crystal have good cohesive strength and physical property via Molecular Design, adjustment, in addition, reduce volume resistance by further interpolation metallic salt or by structural design as importing benzene ring structure, and then reduction driving voltage, therefore be suitable for very much serving as the photosensitive binder with high bond strength and low driving voltage in reflective bendable liquid crystal display.
According to the preferred embodiments of the present invention, the photosensitive binder that this liquid crystal display is used comprises: carbamate (urethane) oligomer; The reactive monomer that contains phenyl; And light initiator.
In addition, according to another preferred embodiment of the present invention, the photosensitive binder that this liquid crystal display is used comprises: the carbamic acid oligomer ester of 60 to 90 percentage by weights; The reactive monomer that contains phenyl of 10 to 40 percentage by weights; And the light initiator of 0.1 to 15 percentage by weight, wherein this percentage by weight system is take the gross weight of carbamic acid oligomer ester, the reactive monomer that contains phenyl and light initiator as benchmark.
In addition, the present invention also provides a kind of liquid crystal display, comprises: first substrate and second substrate; The capsule-type liquid crystal layer, this capsule-type liquid crystal layer is formed between first and second substrate; And it is one of at least upper or coat on the capsule-type liquid crystal layer that the photosensitive binder that above-mentioned liquid crystal display is used, this photosensitive binder are coated first and second substrate, in order at least one in bond capsule-type liquid crystal layer and first and second substrate.
Below by a plurality of embodiment and comparative example, illustrate further method of the present invention, feature and advantage, but be not to limit the scope of the invention, scope of the present invention should be as the criterion with the scope of appended claims.
[description of drawings]
Fig. 1 a to Fig. 1 e does not show the manufacture method of bendable liquid crystal display of the present invention.
[main description of reference numerals]
10～first substrate; 50～sensitization bonding coating layer;
20～electrode layer; 60～second substrate;
30～capsule-type liquid crystal layer; 70～UV light;
40～capsule-type liquid crystal; 100～liquid crystal display.
[embodiment]
The present invention system provides the low driving voltage photosensitive binder that liquid crystal display uses and the liquid crystal display that comprises it, and wherein this photosensitive binder is specially adapted to bendable liquid crystal display.It should be noted that, this photosensitive binder is intermolecular has strong copolymerization power (cohesive strength), and provide cohesive force (adhesive strength) strong between substrate and liquid crystal capsule (parcel dichroic dye), and make display still possess fixing liquid crystal cells spacing (cell gap) when deflection, make the display quality can not be affected when deflection, be suitable for very much in bendable liquid crystal display.In addition, the present invention has high phenyl ring content by adding metallic salt and importing photo-sensitive monomer reduces volume resistance, and then reduces the whole driving voltage of liquid crystal display.
Photosensitive binder of the present invention comprises:
The carbamic acid oligomer ester of 60 to 90 percentage by weights;
The reactive monomer that contains phenyl of 10 to 40 percentage by weights; And
0.1 to the light initiator of 15 percentage by weights, wherein this percentage by weight system take the carbamic acid oligomer ester, contain phenyl reactive monomer, and the gross weight of light initiator as benchmark.
The molecular weight of this carbamic acid oligomer ester is preferably greater than 2000, when illumination and reactive monomer produced polyreaction, the carbamic acid oligomer ester with higher molecular weight can strengthen the intensity of photosensitive binder (higher glue material copolymerization power) when this carbamic acid oligomer ester.In addition, the OH value of this carbamic acid oligomer ester (OH value) is preferably greater than 40, because the raising by the OH value can increase considerably the cohesive strength between glue material and substrate or glue material and liquid crystal capsule (parcel dichroic dye).
The reactive monomer of this phenyl is the acrylate monomer that contains phenyl.Wherein, when the benzene content of this reactive monomer increased, the driving voltage of this liquid crystal display also decreased, and when benzene content accounts for the 40wt% of this reactive monomer when above, can make driving voltage than more than the low 2.5～9V of commercially available product.
this light initiator can make this monomer and oligomerization close after the UV irradiation to carry out polyreaction, this light initiator can be for example: diethoxy acetophenone (diethoxy acetophenone), benzophenone (benzophenone), benzyl benzoin isobutyl ether (benzyl benzoin isobutyl ether), benzyl dimethyl ketal (benzyl dimethyl ketal), 1-hydroxycyclohexylphenylketone (1-hydroxycyclohexyl phenyl ketone), diethyl thioxanthone (diethyl thioxanthone), 2-EAQ (2-ethyl anthraquinone), 2-hydroxy-2-methyl-1-phenyl-propane-1-ketone (2-hydroxy-2-methyl-1-phenylpropane-1-one), 1-(4-isopropyl phenyl)-2-hydroxy-2-methyl propane-1-ketone (1-(4-isopropylphenyl)-2-hydroxy-2-methylpropane-1-one), 2-methyl-[4-(methyl mercapto) phenyl]-2-morpholino-1-propane (2-methyl-[4-(meyhylthio) phenyl]-2-morpholino-1-propane), the heavy diazo salt (aromatic diazonium salts) of fragrance, triallyl sulfonium salt (triallysulfonium salts), diallyl salt compounded of iodine (diallyiodonium salts), triallyl selenium salt of lewis acid and metallocene compound (triallylselenium salts of Lewis acid as well as metallocene compounds) and composition thereof.
Wherein, utilize the design of this photosensitive binder and capsule-type liquid crystal structure and interaction force, functional group as nonpolar in polarity, π-π (the π ﹠amp that interacts; π interaction), the Design of Compatibilities such as hydrogen bond (Hydrogen bonding) and viscosity (viscosity), make it have good pliability and physical property, also can add in addition metallic salt or reduce volume resistance and then reduce driving voltage as importing benzene ring structure by structural design, the sensitization binding material of high transparent, the low viscosity of exploitation, high bond strength, low volume resistance and low process temperatures.Wherein, this metallic salt can be for example: lithium salts, sodium salt, sylvite and composition thereof.
The present invention also provides a kind of liquid crystal display, is for example bendable liquid crystal display, below in conjunction with its manufacture method of description of drawings.
At first, please refer to Fig. 1 a, first substrate 10 is provided, the material of this first substrate 10 can be glass or plastic base, can be in the present embodiment for example pet substrate, can not form any electrode on substrate, also can be pre-formed the electrode layer 20 of patterning, as shown in Fig. 1 b.This electrode layer can be transparency electrode, and as tin indium oxide (ITO), indium zinc oxide (IZO), zinc oxide aluminum (AZO) or zinc paste (ZnO), and its generation type can be sputter or plasma reinforced chemical vapour deposition mode.
Then, please refer to Fig. 1 c, form capsule-type liquid crystal layer 30 on first substrate 10, wherein this capsule-type liquid crystal layer 30 comprises a plurality of capsule-type liquid crystal 40 that contain dichroic dye.
Then, please refer to Fig. 1 d, photosensitive binder of the present invention is coated on this capsule-type liquid crystal layer 30, form sensitization bonding coating layer 50.
At last, please refer to Fig. 1 e, second substrate 60 is configured on this sensitization bonding coating layer 50, and utilize this sensitization bonding coating layer 50 of UV light 70 irradiations, make this sensitization bonding coating layer 50 sclerosis, namely complete liquid crystal display 100 of the present invention.
Below, show a series of preferred embodiment and comparative examples that meet photosensitive binder of the present invention, in order to further to illustrate technical characterictic of the present invention.
The photosensitive binder strength test
With photosensitive binder A, photosensitive binder B, with commercially available NOA65 (make and sell by Noland) respectively with 10um spacer (Japanese catalyst, Epostar L15) blending, and coat on the PET base material.Then, use the Instron tension tester to measure adhesive strength (shear strength (Shear strength) and peel strength (Peel strength)), the composition of this photosensitive binder A, photosensitive binder B and NOA65, OH value and result are as shown in table 1.It should be noted that, the OH value of photosensitive binder A exceeds 1.6 times than the commercial goods, no matter be that shear strength or peel strength all are much better than commercially available product to the PET cohesive strength, wherein the peel strength paid attention to of flexible display is higher more than 30 times than the commercial goods.
Table 1
The driving voltage test of liquid crystal display
The above-mentioned liquid crystal display manufacture method (method shown in Fig. 1 a～1e) according to the present invention, and the glue material of arranging in pairs or groups different prepares a series of liquid crystal display, and (substrate that uses is pet substrate, the capsule-type liquid crystal layer that uses mixes (mode of allotment is that anthraquinone dye is mixed with ZLI-1565 with the ratio of 1: 9) as ZLI-1565 (Merck company produce) with anthraquinone dye (anthraquinone dye), and measures its driving voltage (V
90) (penetrance becomes 90% voltage), composition and the result of photosensitive binder are as shown in table 2.
Table 2
From the above, the phenyl ring content of answering monomer when reflexive can make by the importing of benzene ring structure driving voltage than the low 2.5～9V of commercially available product greater than 40% the time.
Although the present invention discloses as above with a plurality of preferred embodiments, so it is not to limit the present invention, any the technical staff in the technical field of the invention, and without departing from the spirit and scope of the present invention, Ying Kezuo is change and retouching arbitrarily.Therefore, protection scope of the present invention should be as the criterion with the appended claims restricted portion.
Claims (11)
1. photosensitive binder that liquid crystal display is used comprises:
The carbamic acid oligomer ester, wherein the OH value of this carbamic acid oligomer ester is greater than 40;
The reactive monomer that contains phenyl is more than wherein the benzene content of this reactive monomer accounts for the 40wt% of this reactive monomer, take the gross weight of this reactive monomer as benchmark; And
The light initiator.
2. the photosensitive binder that uses of liquid crystal display as claimed in claim 1, wherein the molecular weight of this photonasty carbamic acid oligomer ester is greater than 20,000.
3. the photosensitive binder that uses of liquid crystal display as claimed in claim 1, wherein this reactive monomer that contains phenyl is the acrylate monomer that contains phenyl.
4. the photosensitive binder that uses of liquid crystal display as claimed in claim 1, further comprise: metallic salt.
5. photosensitive binder that liquid crystal display is used comprises:
The carbamic acid oligomer ester of 60 to 90 percentage by weights, wherein the OH value of this carbamic acid oligomer ester is greater than 40;
The reactive monomer that contains phenyl of 10 to 40 percentage by weights is more than wherein the benzene content of this reactive monomer accounts for the 40wt% of this reactive monomer, take the gross weight of this reactive monomer as benchmark; And
0.1 to the light initiator of 15 percentage by weights, wherein this percentage by weight system is take the gross weight of carbamic acid oligomer ester, the reactive monomer that contains phenyl and light initiator as benchmark,
Wherein the percentage by weight sum of carbamic acid oligomer ester, the reactive monomer that contains phenyl and light initiator is 100 percentage by weights.
6. the photosensitive binder that uses of liquid crystal display as claimed in claim 5, wherein the molecular weight of this photonasty carbamic acid oligomer ester is greater than 20,000.
7. the photosensitive binder that uses of liquid crystal display as claimed in claim 5, wherein this reactive monomer that contains phenyl is the acrylate monomer that contains phenyl.
8. the photosensitive binder that uses of liquid crystal display as claimed in claim 5, further comprise: metallic salt.
9. liquid crystal display comprises:
First substrate and second substrate;
Capsule-type liquid crystal layer, this capsule-type liquid crystal layer are formed between this first and second substrate; And
The photosensitive binder that liquid crystal display as claimed in claim 1 is used, it is one of at least upper or coat on the capsule-type liquid crystal layer that this photosensitive binder is coated this first and second substrate, in order at least one in bond this capsule-type liquid crystal layer and first and second substrate.
10. liquid crystal display as claimed in claim 9, wherein this capsule-type liquid crystal layer comprises a plurality of capsule-type liquid crystal that contain dichroic dye.
11. liquid crystal display as claimed in claim 9, wherein this first and second substrate is glass or plastic base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710154236 CN101386772B (en) | 2007-09-11 | 2007-09-11 | Photosensitive binder for liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710154236 CN101386772B (en) | 2007-09-11 | 2007-09-11 | Photosensitive binder for liquid crystal display |
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| CN101386772A CN101386772A (en) | 2009-03-18 |
| CN101386772B true CN101386772B (en) | 2013-06-05 |
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| CN 200710154236 Expired - Fee Related CN101386772B (en) | 2007-09-11 | 2007-09-11 | Photosensitive binder for liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916022B (en) * | 2010-07-06 | 2012-10-10 | 友达光电股份有限公司 | Flexible display panel and manufacturing method thereof |
| KR102386996B1 (en) * | 2017-11-20 | 2022-04-14 | 엘지디스플레이 주식회사 | Liquid Crystal Display Device Including Liquid Crystal Capsule And Method Of Fabricating The Same |
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2007
- 2007-09-11 CN CN 200710154236 patent/CN101386772B/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
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| JP特开2003-147281A 2003.05.21 |
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