TWI490238B - An acrylic resin composition, an alignment film formed, and a three-dimensional liquid Crystal display - Google Patents

Description

Acrylic resin composition, alignment film formed thereof, and three-dimensional liquid Crystal display

The present invention relates to an acrylic resin composition, and more particularly to an acrylic resin composition comprising an acrylate having a specific content ratio and having a long carbon chain functional group.

In liquid crystal displays, it is generally desirable to utilize an alignment film to align liquid crystal molecules in a particular direction. In the naked-view three-dimensional liquid crystal display, the anchoring force and alignment uniformity of the alignment film for the liquid crystal are crucial for the image quality of the finally rendered three-dimensional image, which means that the alignment film is subjected to directional friction. The ability to align liquid crystal molecules neatly and evenly in a particular direction. If the alignment film has insufficient anchoring force or alignment uniformity to the liquid crystal, the three-dimensional liquid crystal display will have a significant difference in the alignment area, causing distortion of the image signal transmission, and the image quality of the three-dimensional image presented is low, thereby enabling the user to When viewing a three-dimensional picture through the three-dimensional liquid crystal display, undesirable visual phenomena such as image chromatic aberration or overlap occur.

Therefore, the first object of the present invention is to provide a propylene The acid resin composition can effectively improve the alignment uniformity of the liquid crystal.

Thus, the acrylic resin composition of the present invention contains an acrylate component, a photoinitiator, and a binder. Wherein the acrylate component comprises a first acrylate represented by the following formula (I): CH ₂ =CRCO(CH ₂ ) _n CH ₃ (I)

In the formula (I), R represents hydrogen or a methyl group, and n represents 7 to 17. Wherein, the total weight of the acrylic resin composition is 100 wt%, and the content of the first acrylate is in the range of 10 to 19 wt%.

A second object of the present invention is to provide an alignment film which is formed by coating an acrylic resin composition as described above and then exposing it, and is suitable for improving a reactive liquid crystal formed thereon. Orientation uniformity.

A third object of the present invention is to provide a three-dimensional liquid crystal display having good alignment uniformity, comprising a transparent substrate, a polyimide film formed on the transparent substrate, and a polyimine film formed on the polyimide film. a liquid crystal layer and an alignment film which is in contact with the liquid crystal layer and has an interface formed by the alignment film and the liquid crystal layer in a wave-shape.

The effect of the acrylic resin composition of the present invention is that an alignment film capable of producing a good alignment uniformity to a liquid crystal can be formed by a first acrylate containing a specific content ratio and having a long carbon chain functional group, and can be formed into a three-dimensional shape. LCD Monitor.

Other features and effects of the present invention will be described with reference to the drawings. It is clearly shown in the embodiment, wherein: FIG. 1 is a polarizing microscope photograph illustrating the alignment result of the three-dimensional liquid crystal display of the application example 1 of the present invention; and FIG. 2 is a polarizing microscope photograph illustrating the three-dimensional liquid crystal display of the application example 2 of the present invention. Fig. 3 is a polarizing microscope photograph illustrating the alignment result of the three-dimensional liquid crystal display of Comparative Example 1, and Fig. 4 is a polarizing microscope photograph illustrating the alignment result of the three-dimensional liquid crystal display of Comparative Example 2.

The acrylic resin composition of the present invention contains an acrylate component, a photoinitiator, and a binder. Wherein the acrylate component comprises a first acrylate represented by the following formula (I): CH ₂ =CRCO(CH ₂ ) _n CH ₃ (I)

In the formula (I), R represents hydrogen or a methyl group, and n represents 7 to 17. Wherein, the total weight of the acrylic resin composition is 100 wt%, and the content of the first acrylate is in the range of 10 to 19 wt%.

The total weight of the acrylic resin composition is 100 wt%, and when the content of the first acrylate is less than 10 wt%, the alignment film formed is insufficient to produce uniform alignment to the liquid crystal; When the content of the acrylate is more than 19% by weight, the hardness of the alignment film formed is insufficient, so that the effect of rubbing after the film formation of the acrylic resin composition is poor, and the liquid crystal which is subsequently coated cannot be aligned. . Preferably, the content of the first acrylate ranges from 13 to 17 wt%.

The first acrylate has a long carbon chain functional group of C ₈ ~ C ₁₈ , which can be used to enhance the forward direction of the acrylic resin composition after directional rubbing, and increase the anchoring force to the liquid crystal, so that the liquid crystal It is not easily affected by the surface of the terrain and slides. When the first acrylate has a long carbon chain functional group of less than 8 carbons, the acrylic resin composition has poor forward direction when oriented rubbing after film formation, and the formed alignment film does not have liquid crystal for the liquid crystal. Good alignment uniformity; when the first acrylate has a long carbon chain functional group of more than 18 carbons, the acrylic resin composition exhibits a haze at normal temperature, is difficult to transmit light, and is subjected to subsequent processing and application. Preferably, the first acrylate has a C ₁₂ ~ C ₁₈ long carbon chain functional group.

Preferably, the first acrylate is commercially available from Changxing Chemical Co., Ltd. EM-2191 [containing octyl acrylate and octyl-decyl acrylate], EM-215 [containing lauryl acrylate] ] or EM-218 [containing stearyl acrylate].

Preferably, the acrylate component further comprises a second acrylate containing at least one OCH ₂ CH ₂ group to enhance the alignment force of the alignment film formed thereby.

Preferably, the second acrylate is selected from 2-(2-ethoxyethoxy)ethyl acrylate, EOEOEA, 2-phenoxyethyl acrylate (2-phenoxyethyl acrylate, PHEA), 2-( p- cumylphenoxy)ethyl acrylate, CPEA, 2-(o-phenylphenoxy) acrylate Ethyl 2-[ o- phenylphenoxy)ethyl acrylate, OPPEA], ethoxylated (3) phenoxyl acrylate, PH (3EO) A, or a combination thereof. Preferably, the second acrylate is selected from the group consisting of 2-(2-ethoxyethoxy)ethyl acrylate (EOEOEA), 2-phenoxyethyl acrylate (PHEA) or a combination thereof. More preferably, the second acrylate is EM-210 (containing PHEA), EM-211 (containing EOEOEA), or a combination thereof, which is commercially available from Changxing Chemical.

In a specific embodiment of the present invention, the acrylate component further comprises EM-223 [containing tripropylene glycol diacrylate], EM-2108 (containing CPEA), DR-U026, which is commercially available from Changxing Chemical Co., Ltd. [containing an aliphatic urethane acrylate], FS-2250 [containing fluorene-based acrylate] or a combination thereof.

Preferably, the photoinitiator is an ultraviolet light initiator. More preferably, the ultraviolet light initiator is commercially available I-184, I-819, I-173 or TPO from Ciba Corporation. In a particular embodiment of the invention, the photoinitiator is commercially available I-184 [containing 1-hydroxycyclohexyl phenyl ketone] from Ciba Corporation.

Preferably, the binder is a PMMA type binder, a urethane acrylate type binder, a siloxane acrylate type binder, and a liquid rubber acrylate type binder. In a particular embodiment of the invention, the binder is 353H (containing PMMA) commercially available from Double Bond Chemicals.

Preferably, the acrylic resin composition of the present invention further comprises an antifoaming agent. In a specific embodiment of the invention, the antifoaming agent is WD-608 [containing Silicone-acrylate] commercially available from Cooper.

The alignment film of the present invention is an acrylic system as described above After the resin composition is applied, it is formed by exposure. In a specific embodiment of the present invention, the alignment film is coated on a polyethylene terephthalate (PET) substrate by an acrylic resin composition as described above, and is subjected to a rolling process. It is exposed to ultraviolet light and formed by directional rubbing.

Preferably, in the acrylic resin composition forming the alignment film, the acrylate component further comprises a second acrylate containing at least one OCH ₂ CH ₂ group.

The three-dimensional liquid crystal display of the present invention comprises a transparent substrate, a polyimide film formed on the transparent substrate, a liquid crystal layer formed on the polyimide film, and a liquid crystal layer in contact with the liquid crystal layer as described above. An alignment film, wherein an interface between the alignment film and the liquid crystal layer is wavy.

<Example> [Examples 1 to 2 and Comparative Examples 1 to 3]

The acrylic resin compositions of Examples 1 to 2 and Comparative Examples 1 to 3 of the present invention were obtained by mixing at normal temperature and normal pressure according to the formulation and the amount (wt%) listed in Table 1 below.

[Application Examples 1 to 2 and Comparative Application Examples 1 to 3]

The acrylic resin compositions of the above Examples 1 to 2 and Comparative Examples 1 to 3 were applied onto a polyethylene terephthalate (PET) substrate, and subjected to a cam rolling process, followed by ultraviolet light (1000 mJ). /cm ² ) Exposure, a wavy continuous concave film was formed, and after oriented rubbing, the alignment films of Application Examples 1 to 2 and Comparative Application Examples 1 to 3 were respectively obtained. Among them, the alignment film of Comparative Application Example 3 contained too many long carbon chain functional groups, resulting in insufficient hardness, so that the effect of performing directional rubbing was not good, and the subsequent applied liquid crystal could not be aligned.

A Nematic reactive liquid crystal polymer is applied to the alignment film, and a glass having a polyimide film formed on the upper surface is coated thereon, and finally exposed to ultraviolet light to cure the liquid crystal, respectively. Application Examples 1 to 2 and Comparative Application Examples 1 to 2 of the three-dimensional liquid crystal display, and the alignment results were observed by a polarizing microscope, The results are shown in Figures 1 to 4, respectively.

Referring to FIG. 1 to FIG. 4, the three-dimensional liquid crystal display of Application Examples 1 to 2 has no obvious alignment area difference, and shows that it has good alignment uniformity. Referring to FIG. 3 and FIG. 4, the three-dimensional liquid crystal display of Comparative Application Examples 1 and 2 has significant difference in brightness and darkness of the alignment area (as indicated by the arrows in the figure), and the alignment is less due to lack of long carbon chain functional groups or insufficient content. Uniform, thus causing image chromatic aberration or overlap when viewing a three-dimensional picture through the three-dimensional liquid crystal display.

As described above, since the acrylic resin composition of the present invention contains 10 to 19% by weight of the first acrylate having a long carbon chain functional group of C ₈ to C ₁₈ , the acrylic resin composition can be effectively strengthened to form an alignment film. The forward directional ability during directional rubbing can produce uniform alignment to the liquid crystal and increase the anchoring force to the liquid crystal, so that the liquid crystal is not easily affected by the surface of the surface and slides, so the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

Claims (9)

An acrylic resin composition for preparing an alignment film of a three-dimensional liquid crystal display, comprising: an acrylate component, comprising a first acrylate; a photoinitiator; and a binder, wherein the first acrylate is Formula (I): CH ₂ = CRCOO(CH ₂ ) _n CH ₃ (1) In the formula (I), R represents hydrogen or methyl, and n represents 7 to 17; wherein, the acrylic resin is composed The total weight of the material is 100% by weight, and the content of the first acrylate is in the range of 10 to 19% by weight. The acrylic resin composition according to claim 1, wherein the total weight of the acrylic resin composition is 100% by weight, and the content of the first acrylate is in the range of 13 to 17% by weight. The acrylic resin composition according to claim 1, wherein, in the formula (I), n represents 11 to 17. The acrylic resin composition according to claim 3, wherein, in the formula (I), n represents 11. The acrylic resin composition according to claim 1, wherein the acrylate component further comprises a second acrylate having at least one OCH ₂ CH ₂ group. The acrylic resin composition according to claim 5, wherein the second acrylate is selected from the group consisting of 2-(2-ethoxyethoxy)ethyl acrylate, 2-phenoxyethyl acrylate, and acrylic acid. 2-(p-isopropylphenylphenoxy)B Ester, 2-(o-phenylphenoxy)ethyl acrylate, ethoxylated 2-phenoxyethyl acrylate or a combination thereof. The acrylic resin composition according to claim 5, wherein the second acrylate is selected from the group consisting of 2-(2-ethoxyethoxy)ethyl acrylate and 2-phenoxyethyl acrylate or combination. An alignment film formed by coating an acrylic resin composition according to any one of claims 1 to 7 and then exposing it. A three-dimensional liquid crystal display comprising a transparent substrate, a polyimide film formed on the transparent substrate, a liquid crystal layer formed on the polyimide film, and a contact with the liquid crystal layer and as claimed in claim 8 In the alignment film, the interface between the alignment film and the liquid crystal layer is wavy.