KR101530257B1 - Antiglare coating layer and antiglare film - Google Patents

Abstract

The present invention relates to an antiglare layer and an antiglare film, and more particularly, to an antiglare layer and an antiglare film, in which all particles are uniformly distributed as a single layer by controlling the volume ratio of the matrix agent and particles contained in the antiglare layer, The present invention relates to an antiglare layer and an antiglare film which are excellent in flicker resistance and have improved glittering phenomenon without whitening and coating nonuniformity, thereby improving visibility.

Bulk density, particle, volume ratio, glittering

Description

ANGLE COATING LAYER AND ANTIGLARE FILM [0002]

The present invention relates to an antiglare layer and an antiglare film in which the distance between all the particles and the particle is adjusted to be less than the length of the minor axis of the color filter subpixel to improve the glittering phenomenon.

Various image display devices such as a liquid crystal display (LCD), an electroluminescence (EL) display, a plasma display (PDP), a field emission display (FED), and the like are exposed to external light such as natural light or illumination light, As the light incident on the surface is reflected, the contrast is lowered, the visibility is deteriorated due to the reflection of the image, and the screen becomes brighter and the character recognition becomes difficult, which easily increases the fatigue of the eyes or causes a headache.

In order to solve such a problem, an antiglare film having a function of inducing irregular reflection of light by the surface protruding portion to reduce reflection of light and disposed on the surface of various image display devices has been mainly used.

The antiglare film is formed by applying a resin containing filler particles such as silica or resin beads to the surface of the transparent base film. It is preferable that the resin film And surface irregularities are formed by adding organic filler particles having a larger particle diameter than the thickness.

However, as shown in FIG. 1, when the light emitted from the color filter 10 is scattered by the particles 41 on the surface of the antidazzle coating layer 40, the gap between the particles 41 becomes wider Light of a specific pixel of the color filter 10 leaks out, thereby causing a glittering phenomenon such as a flashing and blurring of the screen of the image display device.

In order to prevent such glittering phenomenon, excessive use of filler particles has been proposed, but whitening occurs on the surface of the film, resulting in deterioration of optical characteristics such as resolution, contrast and transparency, Unevenness is generated and the quality of the product is also deteriorated.

The present invention can adjust the distance between all the particles and particles according to the size of the subpixel of the color filter when applied to various display devices using a color filter, so that the anti-glare layer having improved whitening phenomenon and whitening phenomenon The purpose is to provide.

Another object of the present invention is to provide an antiglare film in which the antiglare layer is laminated.

It is still another object of the present invention to provide a polarizing plate or an image display device in which the antiglare layer is laminated.

As a result of intensive researches to achieve the above object, the present inventors have found that when the distance between all particles and particles is less than the short axis distance of the color filter subpixel, the light of a specific pixel does not leak out, And it was confirmed that the glittering phenomenon was prevented. In addition, in the conventional method of controlling the content (weight ratio or weight%) of the particles used for the anti-glare coating composition in order to prevent the glittering phenomenon in forming the antiglare layer, since the weight of each particle is not taken into account, It is confirmed that the amount of heavier particles becomes smaller when the particles are used and the amount of the particles becomes larger when the particles are used lightly. That is, it was difficult to make the distance between the particles and the particles to be less than a specific range only by the size and content of the particles. Instead, by calculating the volume ratio of the matrix agent and particles in the antiglare layer and using the corresponding particle content, the distance between all the particles and the particle can be controlled to a desired range value, It is possible to prevent the glittering phenomenon, and the present invention has been completed on the basis thereof.

The present invention provides a diffuser layer comprising a matrix and particles, wherein the distance between all particles and the particles is less than the length of the minor axis of the color filter subpixel.

The volume ratio (X) of the particles to the 100 volume ratio of the matrix 100 satisfies the following formula (4).

D is the length of the minor axis of the color filter subpixel, and d is the thickness ratio of the matrix coating to the particle diameter, 0 < P < 1).

Further, the present invention provides an antiglare film in which the antiglare layer is laminated on one side of a transparent base film.

Further, the present invention provides a polarizing plate in which a protective film is laminated on at least one surface of a polarizer, wherein at least one of the protective films is a laminated film of the antiglare layer.

The present invention also provides an image display device provided with the antiglare layer or the polarizer.

According to the present invention, all the particles for forming the unevenness of the antiglare layer are uniformly distributed as a single layer and the distance between all the particles and the particles is adjusted to be less than the short axis distance of the color filter subpixel, It is possible to provide an antiglare layer and an antiglare film with improved visibility due to the improvement of the glittering phenomenon even without the development and coating non-uniformity. Unlike the method of controlling the diameter and the content of the conventional particles, by using a method of controlling the volume ratio of the particles to the volume ratio of the matrix as shown in Equations 1 to 4, .

The present invention relates to an antiglare layer and an antiglare film in which the distance between all the particles and the particle is adjusted to be less than the length of the minor axis of the color filter subpixel to improve the glittering phenomenon.

Hereinafter, the present invention will be described in detail.

The antiglare layer of the present invention comprises a matrix agent and particles, wherein the distance between all particles and the particle is less than the length of the minor axis of the color filter subpixel.

It is preferable that the volume ratio (X) of the particles to the 100 volume ratio of the matrix 100 satisfy the following expression (4).

&Quot; (4) &quot;

D is the length of the minor axis of the color filter subpixel, and d is the thickness ratio of the matrix coating to the particle diameter, 0 < P < 1).

The matrix agent is a curable resin for forming a coating layer, and conventional thermosetting or ultraviolet curable resins used for forming a coating layer can be used.

The particles are for imparting antistatic properties by forming irregularities on the surface of the coating layer, and the kind thereof is not particularly limited. For example, organic particles, inorganic particles, or organic-inorganic composite particles can be used.

The average diameter of the particles is not particularly limited, but is preferably smaller than the length of the minor axis of the color filter subpixel, more preferably 1 to 20 mu m. When the average diameter is less than 1 탆, it is difficult to form irregularities large enough to impart sufficient antiglare property. When the average diameter exceeds 20 탆, the transmittance decreases and the image visibility deteriorates.

The matrix agent and particles should be included so that the distance between all the particles and the particles is less than the short axis distance M of the sub-pixels 11 of the color filter 10, as shown in Fig.

Generally, since the weight of these particles is not taken into account when they are used, the amount of heavy particles is decreased when they are used in the same amount. When light particles are used, the amount of heavy particles is increased. It becomes difficult to adjust the distance between the light source and the light source to a desired range value. In particular, if the gap between the particles becomes too large, the glittering phenomenon can not be improved. If the gap between the particles becomes too narrow, the transmittance may be lowered.

In the present invention, it is assumed that the distance between the particle 41 and the particle 41 in the coating layer is less than the short axis distance M of the sub pixel 11, We tried to obtain the particle content value which can improve the glittering phenomenon by calculating the volume ratio.

Specifically, it is assumed that the distance between the particle 41 and the other particle 41 is less than the short axis distance M of the sub pixel 11, and this is converted to a volume ratio. 1, the radius of the particle 41 plus the distance M of the short axis of the sub pixel 11 is set as a radius, and the particle is arranged at the center bottom of the cylinder having a height lower than the particle diameter . At this time, the distance (M) of the short axis of the sub-pixel 11 is the distance between the particles 41. The volume of the matrix 41 excluding the particles in the column is the volume of the matrix 42. When the volume ratio is 100, the volume ratio X of the particles 41 can be expressed by the following equation (1). That is, the volume ratio X of the particles is a volume ratio to the 100 volume ratio of the matrix.

[Equation 1]

100: X = volume ratio of the matrix agent forming the coating layer:

In addition, the volume ratio of the matrix agent and the particles of the formula (1) can be expressed by the following equation (2).

&Quot; (2) &quot;

From the proportional expression in Equation (2), the X value can be calculated to obtain the volume ratio of the particles to the 100 volume ratio of the matrix.

&Quot; (3) &quot;

In the above equations (2) and (3), d is 1 占 퐉? D? 20 占 퐉 in particle diameter, M is the length of the minor axis of the color filter subpixel, and d <M.

P is a thickness ratio of the coating to the particle diameter with respect to the particle diameter, and 0 < P < 1, more preferably 0.1 to 0.99 in consideration of the fact that the particles are distributed in a single layer. When the P value is less than 0.1, the matrix agent can not sufficiently support the particles and the mechanical strength of the antiglare layer can be weakened. When the P value is more than 0.99, surface irregularities are hardly formed and sufficient effect as the antiglare layer is hardly obtained.

Since the calculated volume ratio is a value such that the distance between all the particles and the particle becomes the distance of the short axis of the subpixel, the volume ratio satisfying the following expression (4) It is possible to make the distance between all the particles and the particle smaller than the short axis distance of the subpixel so that the leakage of light from the subpixel is prevented and the glitter phenomenon can be improved.

&Quot; (4) &quot;

In addition, it is possible to calculate the minimum content of the particles so that the distance between all the particles becomes the distance of the short axis of the subpixel using the volume ratio and the density value of the particles. If the content is used in excess of the content, .

In addition, the upper limit of X is the minimum value of P, and the particle-to-particle spacing is O, that is, the volume ratio of particles when all the particles and the particles are completely adhered to each other in a single layer.

In addition to the matrix agent and particles, the flame-retardant coating liquid composition may include a solvent, a photopolymerization initiator, a photopolymerization initiator, and the like. It may further include additives such as an antioxidant, an ultraviolet absorber, a light stabilizer, a passivation polymerizing inhibitor, a leveling agent, a surfactant, a lubricant, an antistatic agent and a dispersant.

The antiglare film of the present invention is characterized in that the antiglare layer is laminated on a transparent base film.

The transparent base film is not particularly limited as long as it is a transparent plastic film. Examples of the transparent base film include polyolefin films such as polyethylene, polypropylene, cyclo- or norbornene-structured polyolefin and ethylene propylene copolymer; Cellulose-based films such as diacetyl cellulose, triacetyl cellulose, acetyl cellulose butyrate, isobutyl ester cellulose, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose and acetyl propionyl cellulose; Polyester films such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate and polybutylene terephthalate; Styrene-based films such as polystyrene and acrylonitrile-styrene copolymer; Amide type films such as nylon and aromatic polyamide; Polyether imide films; Polyimide films; Acrylic films such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Polyethersulfone film; Polysulfone film; Polyvinyl chloride films; Polyvinylidene chloride films; Polyvinyl alcohol film; Polyvinyl acetal film; Polyether ketone films; Polyetheretherketone films; Polycarbonate film; Polyurethane film; Epoxy film and the like. These may be unstretched, uniaxially or biaxially stretched films.

The thickness of the transparent base film is not particularly limited and may be 8 to 1000 탆, preferably 40 to 100 탆.

Wherein the antiglare layer comprises a matrix agent and particles, wherein the volume ratio X of the particles to the 100 volume ratio of the matrix in the antiglare layer satisfies the expression (4), and the distance between all the particles and the particles is less than the short axis distance of the subpixel of the color filter The particles are uniformly distributed as a single layer.

&Quot; (4) &quot;

D is the length of the minor axis of the color filter subpixel, and d is the thickness ratio of the matrix coating to the particle diameter, 0 < P < 1).

P is preferably 0.1 to 0.99.

The method of laminating the antiglare layer is not particularly limited, and for example, a method of coating the composition of the antifogging coating liquid on the transparent substrate film by a method such as die coater, air knife, reverse roll, spray, blade, casting, gravure or spin coating Followed by post-curing. At this time, the temperature, the time, the curing method and the like are not particularly limited.

Further, a high refractive index layer, a low refractive index layer, an antistatic layer, an antifouling layer, a moisture-proof layer, an antistatic high refractive index layer, an antistatic low refractive index layer and the like may be laminated on the antiglare film.

Such an anti-glare film is excellent in anti-glare properties and has improved glittering effect without whitening phenomenon and coating non-uniformity, and can be used as a polarizing plate or a liquid crystal display (LCD), an electroluminescence (EL) display, a plasma display (FED) and the like to improve the visibility.

The polarizing plate of the present invention is characterized in that a protective film is laminated on at least one surface of a polarizer, and at least one of the protective films is a film on which the antiglare layer is laminated.

Further, the image display apparatus of the present invention is characterized in that the antiglare layer or the polarizing plate is provided.

Examples of the image display device include a liquid crystal display (LCD), an electroluminescent (EL) display, a plasma display (PDP), a field emission display (FED) and the like.

In the present invention, since the polarizing plate and the image display device are well known to those skilled in the art, detailed description of each constitution will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, it is apparent to those skilled in the art that various modifications and variations are possible within the scope and spirit of the present invention, , And it is natural that such variations and modifications fall within the scope of the appended claims.

Example 1

(1) Calculation of the volume ratio (X) of particles

An antireflection layer was formed so that particles having an average diameter of 6 占 퐉 were used and the thickness ratio P of the matrix coating to the particle diameter was 0.5 and the application of the color filter subpixel to an image display device having a short axis length of 30 占 퐉 , The volume ratio of the particles to the 100 volume ratio of the matrix was calculated.

According to Equation 2, 100: X = 3267π ( ㎛ 3) -54 / 3π (㎛ 3): 108 / 3π (㎛ 3), i.e., 100: X = 3249: is 36, solving this proportion is 1.11 X .

As a result, when the volume ratio of the matrix agent and the particle is 100: 1.11, the distance between the particle and the particle becomes equal to the length of the short axis of the subpixel of the color filter. If particles are used so that X exceeds 1.11, The distance between particles can be adjusted to be less than the short axis distance of the subpixel.

(2) Production of antiglare film

The matrix composition, the particles having an average diameter of 6 m and the common components used for the coating solution were put into a coating solution composition so that the ratio of the matrix agent and the particles was 100: 1.2. The prepared coating liquid composition was coated on a transparent substrate film (TAC, 80 탆) so that the thickness ratio (P) of the coating layer and the particles was 0.5, and dried to form an antiglare layer to prepare a film.

Example 2

The same procedure as in Example 1 was carried out except that a matrix agent and particles were used so that the volume ratio was 100: 2.0.

Comparative Example 1

The same procedure as in Example 1 was carried out except that a matrix agent and particles were used so that the volume ratio was 100: 0.8.

Comparative Example 2

The same procedure as in Example 1 was carried out except that a matrix agent and particles were used so that the volume ratio was 100: 0.5.

Example 3

(1) Calculation of the volume ratio (X) of particles

An anti-glare layer is formed so that particles having an average diameter of 8 탆 are used and the thickness ratio P of the matrix coating to the particle diameter is 0.5, and the application of the color filter subpixel to an image display device having a short axis length of 30 탆 , The volume ratio of the particles to the 100 volume ratio of the matrix was calculated.

Solving the proportional expression of equation (2), X becomes 1.86.

As a result, when the volume ratio of the matrix agent and the particle is 100: 1.86, the distance between the particle and the particle becomes equal to the length of the short axis of the subpixel of the color filter. If particles are used so that X exceeds 1.86, And the distance between particles can be adjusted to be less than the short axis distance of the subpixel.

(2) Production of antiglare film

The matrix component and particles having an average diameter of 8 μm and a common component used in the coating solution were added to the matrix composition so that the volume ratio of the matrix component and the particles was 100: 2.0, thereby preparing a coating solution composition. The prepared coating liquid composition was coated on a transparent substrate film (TAC, 80 탆) so that the thickness ratio (P) of the coating layer and the particles was 0.5, and dried to form an antiglare layer to prepare a film.

Example 4

The same procedure as in Example 3 was carried out except that a matrix agent and particles were used so that the volume ratio was 100: 2.5.

Comparative Example 3

The same procedure as in Example 3 was carried out except that a matrix agent and particles were used so that the volume ratio was 100: 1.5.

Comparative Example 4

The same procedure as in Example 3 was carried out except that a matrix agent and particles were used so that the volume ratio was 100: 1.0.

Test Example

The antiglare properties of the antiglare films prepared in the above Examples and Comparative Examples were measured by the following methods, and the results are shown in Table 1 below.

Glistening resistance: The produced antiglare film was attached to a color filter having a short axis length of 30 mu m of a subpixel, and whether glittering occurred was visually observed and evaluated based on the following criteria.

○: No glittering occurred

?: Partial glittering occurred

X: Overall glittering occurrence

division Thickness ratio, P Particle diameter D
(탆) Subpixel
Length M
(탆) Theoretical
X For Matrix
Particle volume ratio Glittering
Preventiveness Example 1 0.5 6 30 1.11 100: 1.2 ○ Example 2 0.5 6 30 1.11 100: 2.0 ○ Example 3 0.5 8 30 1.86 100: 2.0 ○ Example 4 0.5 8 30 1.86 100: 2.5 ○ Comparative Example 1 0.5 6 30 1.11 100: 0.8 △ Comparative Example 2 0.5 6 30 1.11 100: 0.5 × Comparative Example 3 0.5 8 30 1.86 100: 1.5 △ Comparative Example 4 0.5 8 30 1.86 100: 1.0 ×

As shown in Table 1, in the antiglare film of Examples 1 to 4 according to the present invention, the volume ratio of the matrix agent and particles was adjusted so as to satisfy the expression (4), so that the distance between all the particles and the particles was shortened It is confirmed that the glittering phenomenon is prevented when adhered to the color filter.

On the other hand, in Comparative Examples 1 to 4, since the volume ratio of the matrix agent and the particles does not satisfy the expression (4), the distance between all the particles and the particles in the antiglare layer can not be adjusted so as to be less than the short axis distance of the sub- The overall glittering phenomenon occurred.

As described above, the antiglare film according to the present invention has a polarizing plate which is required to improve visibility by improving the glittering phenomenon, and a liquid crystal display (LCD), an electroluminescence (EL) display, a plasma display (FED), and the like.

FIG. 1 is a schematic view showing the principle of equations (1) to (4) for solving the glittering phenomenon occurring on an antiglare film.

Description of the Related Art [0002]

10: Color filter 11: Sub-pixel

20: glass substrate 30: polarizer

40: Coating layer 41: Particle

42: matrix

Claims (6)

Wherein the distance between all of the particles and the particles is less than the length of the minor axis of the color filter subpixel, wherein the volume ratio X of the particles to the volume ratio of the matrix 100 satisfies the following expression (4) : &Quot; (4) &quot;

D is the length of the minor axis of the color filter subpixel, and d is the thickness ratio of the matrix coating to the particle diameter, 0 < P < 1). delete The antiglare layer according to claim 1, wherein the thickness ratio of the matrix coating to the particle diameter is 0.1 to 0.99. An antiglare film laminated with the antiglare layer of any one of claims 1 to 3 on a transparent base film. A polarizing plate in which a protective film is laminated on at least one surface of a polarizer, wherein at least one of the protective films is a film in which the antiglare layer of claim 1 is laminated. An image display device comprising the antiglare layer of claim 1 or the polarizing plate of claim 5.

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