KR102622805B1 - Method of manufacturing light shielding barrier pattern for multi-view display - Google Patents

Abstract

The present invention relates to a method of manufacturing a parallax barrier pattern for implementing a multi-image display that allows two or more observers to view two or more distinct images from different directions.

Description

Method of manufacturing parallax barrier pattern for multi-view display {METHOD OF MANUFACTURING LIGHT SHIELDING BARRIER PATTERN FOR MULTI-VIEW DISPLAY}

The present invention relates to a method of manufacturing a parallax barrier pattern for implementing a multi-view display that allows two or more observers to view two or more distinct images from different directions.

Display devices for displaying images include liquid crystal displays using liquid crystals, field emission displays, plasma display panels using discharge of inert gas, and organic light emitting diodes. There are organic electroluminescent displays (Organic Light Emitting Diode Displays) using them. Among these, plasma display panels are applied only to large-sized TVs, while liquid crystal displays and organic electroluminescent displays are applied to many fields in various sizes from small to large, such as mobile phones, portable computers, monitors, and TVs.

Here, the liquid crystal display device utilizes the electrical and optical properties of liquid crystal. This is because liquid crystals have different anisotropic properties, such as refractive index and dielectric constant, depending on the major and minor axis directions of the molecules, and have the advantage of being able to easily control the molecular arrangement and optical properties. In other words, a liquid crystal display displays an image by adjusting light transmittance by changing the arrangement direction of liquid crystal molecules according to an electric field.

Specifically, a liquid crystal display device displays images through a liquid crystal panel in which multiple pixels are arranged in a matrix form. Each pixel of the liquid crystal panel realizes the desired color through a combination of red, green, and blue sub-pixels that adjust the light transmittance by varying the liquid crystal arrangement according to the data signal. Each sub-pixel drives the liquid crystal by charging the data signal supplied to the pixel electrode through a thin film transistor and the differential voltage of the common voltage supplied to the common electrode. And since the liquid crystal display device is a non-light-emitting device, the liquid crystal display device is equipped with a backlight unit to supply light from the rear of the liquid crystal panel.

Meanwhile, recently, in order to meet the needs of various users, the development of a dual view liquid crystal display device that can display different images according to the left and right viewing angles without interference through a single liquid crystal display device has been required. there is.

A liquid crystal display device consists of a TFT substrate, a C/F substrate, and a liquid crystal layer located between them. By placing a substrate including a parallax barrier on the top of the C/F substrate, the first image emitted from the first pixel group can only be seen at the position of observer A, and the second image emitted from the second pixel group can be seen only at the position of observer B. It can only be seen in . The parallax barrier substrate may be located on the bottom of the TFT substrate as well as the top of the C/F substrate. Typically, conventional technology requires a process of forming a parallax barrier on a separate substrate (glass, plastic, film, etc.) and bonding it to the display substrate.

In Korean Patent Application Publication No. 2005-0021972, a parallax barrier is implemented directly within a display substrate, but a specific implementation method is not disclosed. For example, a parallax barrier may be included on the surface of the second polarizer (commonly known as a polarizing film), and a parallax barrier layer may be further formed before forming a color filter layer on the C/F substrate. However, this method is used in the process of the C/F substrate. It is not easy because it increases the number.

In addition, Korean Patent Application Publication No. 2012-0012994 discloses that the parallax barrier can be manufactured with a material for manufacturing a black matrix with a grid pattern, but the process of forming the barrier on a glass substrate, ultra-thin glass, or plastic and then impregnating it is performed. in need.

Meanwhile, a parallax barrier can be easily formed by directly applying a photopolymerizable resin composition to an already completed (laminated) display substrate using an inkjet process, but the printed barrier pattern may have high crosstalk.

Korean Patent Application Publication No. 2005-0021972 Korean Patent Application Publication No. 2012-0012994

Accordingly, the present invention seeks to provide a method of manufacturing a parallax barrier pattern that can reduce crosstalk by providing sufficient light-blocking characteristics of the barrier pattern in an inkjet process.

In order to solve the above problems, the present invention,

Applying a parallax barrier pattern on a substrate using an ink composition; and

Curing the applied composition to form a parallax barrier pattern,

The taper angle of the barrier pattern is 4° to 10°,

The barrier pattern width is 100 to 300 μm,

A method of manufacturing a parallax barrier pattern is provided.

Additionally, the present invention provides a parallax barrier pattern formed by the above manufacturing method.

Additionally, the present invention provides a multi-view display panel including the parallax barrier pattern.

Conventionally, when a parallax barrier pattern is manufactured by directly applying an ink composition to a finished display substrate using an inkjet process, the thickness of the barrier pattern is not sufficient compared to the line width due to the spread of the printed ink composition, resulting in high crosstalk. can have In the present invention, by adopting a taper angle of 4 to 10 degrees for the barrier pattern made of the printed ink composition, the light blocking characteristics of the barrier pattern can be sufficiently achieved and crosstalk can be reduced as a result.

Figure 1 shows a pattern implemented according to the interval for forming discharged droplets of an ink composition.
Figure 2 is a diagram showing the barrier width, slit width, barrier spacing, and slit width error of the parallax barrier pattern according to the present invention.
Figure 3 is a diagram for explaining the dimensions and shape, barrier width, barrier height, taper angle, etc. of the printed barrier pattern when viewed from the side.
Figure 4 is a diagram showing patterns printed with various pattern widths.
Figure 5 shows that the effective rate of the barrier width varies depending on the taper angle of the printed barrier pattern. The X-axis means the width of the printed barrier pattern (μm), and the Y-axis means the height of the printed barrier pattern (μm). The graph on the left compares the high barrier pattern height due to a high taper angle, and the graph on the right compares the low barrier pattern height due to a low taper angle.
Figure 6 shows the crosstalk measurement results of the barrier pattern implemented in Example 1.

Since the present invention can be modified in various ways and can have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all transformations, equivalents, and substitutes included in the spirit and technical scope of the present invention. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

The method for manufacturing a parallax barrier pattern according to the present invention includes the steps of applying a parallax barrier pattern on a substrate using an ink composition; and curing the applied composition to form a parallax barrier pattern.

Ink jet nozzles spray ink hundreds to thousands of times per second, and the sprayed ink lands on the substrate in the form of spherical droplets. A linear parallax barrier pattern can be formed by adjusting the impact intervals of dot-shaped ink droplets to be adjacent.

As shown in FIG. 1, the narrower the spacing between droplets and the more dense the ink droplets are, the wider the ink droplets spread, making it possible to implement a wide linear pattern. In Figure 1, only width adjustment through one-dimensional spacing adjustment is explained, but it is also possible to implement a wider width pattern by arranging multiple lines adjacent to each other.

The design dimensions of the barrier pattern are as shown in Figure 2, and the slit width is obtained by subtracting the barrier width from the gap between the barrier patterns. In order to obtain a high-quality barrier pattern, the pattern spacing and pattern width must be constant, and the slit width must also be constant accordingly. However, during the inkjet process, positioning errors may occur due to various reasons such as poor ink straightness, equipment transfer error, head transfer error, etc. As a result, deviations in slit width may appear as shown in the gray/dotted line area in Figure 2. there is. The barrier pattern at the right end of Figure 2 should originally be printed in the gray/dotted line area, but may be moved to the left, such as the black/solid line area, depending on a specific cause. This error in slit width can range from several μm to tens of μm, which may be perceived by the user as a defect when viewing the display screen.

The taper angle of the barrier pattern may be 4° to 10°, or may be 8° to 10°. When the taper angle of the barrier pattern is less than 4°, the height of the barrier pattern decreases and the effective rate is less than 20%, and it is difficult for the printed ink composition to achieve a barrier pattern of 10° or more.

The width of the barrier pattern may be 100 to 300 μm, or 130 to 280 μm. If the width of the barrier pattern is less than 100 μm, it is difficult to expect a certain light blocking effect because it is smaller than the pixel size of a typical display panel, and if the width of the barrier pattern is more than 300 μm, it is not suitable for achieving a high-resolution display.

The substrate may be a hydrophilic substrate or a hydrophobic substrate.

The substrate may be a typical display glass substrate, and in particular, the hydrophilic substrate may be used to chemically and physically remove contaminant organic substances that may be adsorbed during production or processing using a cleaning solvent and a cleaner, chemical treatment with UV ozone, or corona discharge. It may be a glass substrate on which the ink composition is well spread by a cleaning treatment or a hydrophilic atmospheric pressure plasma cleaning treatment.

Typically, it is advantageous to adopt a hydrophilic substrate for the printing process of the ink composition, but in the present invention, a high taper angle can be realized by creating a hydrophobic substrate and then printing the composition. The hydrophobic substrate may be a substrate that imparts uniform hydrophobicity to a display glass substrate. According to one embodiment, in order to implement the hydrophobic substrate, hydrophobization treatment may be performed using hydrophobic plasma using a gas containing a fluorocarbon-based gas.

Alternatively, the hydrophobic substrate may be a substrate obtained by depositing ITO (Indium Tin Oxide) on a glass substrate.

The barrier pattern may have a barrier effectiveness rate of 20 to 80%, or may be 50 to 80%. If the barrier effectiveness rate is less than 20%, crosstalk is high, and if it is more than 80%, there is a high possibility of low pixel density.

Here, the barrier effectiveness rate refers to the barrier pattern width divided by the barrier effective width.

Figure 3 explains the dimensions and shape of the printed barrier pattern, barrier width, barrier height, taper angle, etc. when viewed from the side. Since the barrier pattern is intended to block light emitted from the pixel, a certain level of light blocking density is required. Since light blocking density is proportional to height, light blocking is possible only when the height of the barrier pattern is above a certain level, and this height is defined as the effective height. The width of the barrier pattern refers to the total distance from the starting point to the ending point of the barrier pattern on the substrate, and the effective width refers to the distance of the portion that has sufficient light blocking ability by having a height higher than the effective height. The ratio of the total barrier width to the effective width is defined as the effective rate. The taper angle is the angle formed between the substrate and the pattern at the starting point of the barrier width. Even if the barrier width is the same, the higher the taper angle, the higher the barrier height. Therefore, the effective width with a height higher than the effective height increases, and ultimately the effective rate increases. increases.

As a method of forming a pattern on the substrate, a method selected from among inkjet printing using ultraviolet curing resin, gravure coating, and reverse offset coating can be used instead of photolithography and screen printing.

Light sources for curing the ultraviolet curable ink composition of the present invention include, but are not necessarily limited to, mercury vapor arc, carbon arc, No.

Hereinafter, the ink composition used to form the parallax barrier pattern according to the present invention will be described.

The ink composition used in the present invention may include an alicyclic epoxy monomer.

The alicyclic epoxy monomer may refer to a compound containing one or more epoxidized aliphatic ring groups.

In the alicyclic epoxy compound containing an epoxidized aliphatic ring group, the epoxidized aliphatic ring group refers to an epoxy group bonded to an alicyclic ring, for example, 3,4-epoxycyclopentyl group, 3,4-epoxy Cyclohexyl group, 3,4-epoxycyclopentylmethyl group, 3,4-epoxycyclohexylmethyl group, 2-(3,4-epoxycyclopentyl)ethyl group, 2-(3,4-epoxycyclohexyl)ethyl group, 3- Examples may include functional groups such as (3,4-epoxycyclophethyl)propyl group or 3-(3,4-epoxycyclohexyl)propyl group. The hydrogen atom constituting the alicyclic ring above may be optionally substituted with a substituent such as an alkyl group. As the alicyclic epoxy compound, for example, compounds specifically exemplified below can be used, but the epoxy compounds that can be used are not limited to the types below.

For example, 3,4-epoxycyclohexylmethyl-3,4'-epoxycyclohexane, dicyclopentadiene dioxide, cyclohexene oxide, 4-vinyl-1,2-epoxy-4-vinylcyclohexene, vinylcyclohexene dioxide. , limonene monooxide, limonene dioxide, (3,4-epoxycyclohexyl)methyl-3,4-epoxycyclohexanecarboxylate, 3-vinylcyclohexene oxide, bis(2,3-epoxycyclopentyl)ether, bis (3,4-epoxycyclohexylmethyl)adipate, bis(3,4-epoxy-6-methylcyclohexylmethyl)adipate, (3,4-epoxycyclohexyl)methyl alcohol, (3,4-epoxy- 6-methylcyclohexyl)methyl-3,4-epoxy-6-methylcyclohexanecarboxylate, ethylene glycol bis(3,4-epoxycyclohexyl)ether, 3,4-epoxycyclohexenecarboxylic acid ethylene glycol diester , (3,4-epoxycyclohexyl)ethyltrimethoxysilane, Celoxide 8000 from Daicel Corporation, etc. can be used.

The content of the alicyclic epoxy monomer may be 5 to 30% by weight, or 10 to 20% by weight, based on the total weight of the ink composition. If the content is less than 5% by weight, hardness may decrease, and if the content exceeds 30% by weight, viscosity increases.

Additionally, the ink composition used in the present invention may include an oxetane monomer.

The oxetane monomer is a compound having a 4-membered cyclic ether group in its molecular structure, and can function to lower the viscosity of the cationic cured ink composition (for example, to less than 50 cPs at 25°C).

Specifically, 3-ethyl-3-hydroxymethyl oxetane, 1,4-bis[(3-ethyl-3-oxetanyl)methoxymethyl]benzene, bis[1-(ethyl(3-oxeta) Nyl))methyl ether, 3-ethyl-3-(phenoxymethyl)oxetane, di[(3-ethyl-3-oxetanyl)methyl]ether, 3-ethyl-3-(2-ethylhexyloxymethyl ) Oxetane, 3-ethyl-3-cyclohexyloxymethyl oxetane, or phenol novolac oxetane may be exemplified. Examples of the oxetane compound include "Alonoxetane OXT-101", "Alonoxetane OXT-121", "Alonoxetane OXT-211", and "Alonoxetane OXT-221" manufactured by Toagosei Co., Ltd., or “Alonoxetane OXT-212” etc. can be used. These can be used individually or in combination of two or more types.

The content of the oxetane monomer may be 10 to 40% by weight, or 20 to 30% by weight, based on the total weight of the ink composition. If the content is less than 10% by weight, the viscosity may increase and coating properties may be reduced, and if the content exceeds 40% by weight, the degree of curing may be insufficient.

The ink composition used in the present invention may contain a colorant.

As the colorant, one or more types of pigments, dyes, or mixtures thereof may be used, and are not particularly limited as long as they can express the desired color.

As a specific example, carbon black, graphite, metal oxide, organic black pigment, etc. can be used as the black pigment.

Additionally, the colorant used in the present invention may be a coloring pigment made of a combination of organic color pigments such as red, blue, yellow, and green, or a combination of black or color dyes.

The organic black pigment may be aniline black, lactam black, or perylene black, but is not limited thereto.

The ink composition used in the present invention is cured by irradiation of long-wavelength ultraviolet rays (for example, 365 or 395 nm) and is characterized by having a certain level of OD (Optical Density) at a film thickness of 3 μm or less.

For this purpose, the content of the colorant may be 10 to 30% by weight, or 10 to 20% by weight, based on the total weight of the ink composition. If the content of the colorant is less than 10% by weight, the desired level of OD may not appear, and if the content is more than 30% by weight, the excess colorant may not be dispersed in the ink and a precipitate may be formed, and deep photocuring efficiency may be reduced. This can be greatly reduced.

When the content of the colorant is within the above range, OD can be achieved at 2.0 or more at a film thickness of 3 μm or less after curing.

The ink composition used in the present invention may include a solvent.

The organic solvent may be used without particular limitations as long as it has excellent curing sensitivity even after printing a barrier pattern on a display substrate using the ink composition according to the present invention. However, in order to improve inkjet process performance, the organic solvent must have a boiling point of 200° C. or higher. , it is recommended to use one with a viscosity of 1 to 5 cP at 25°C, preferably 3 cP or less.

In the present invention, the use of an organic solvent that can enhance or improve the inkjet process performance is required, and the inkjet process performance is achieved under the conditions of high boiling point and low viscosity as described above (boiling point is 200°C or higher, viscosity is 25°C). Since the use of an organic solvent that satisfies 1 to 5 cP, especially 3 cP or less, improves, the use of an organic solvent that satisfies these conditions, for example, butyl diglyme (Butyl diglyme, or diethylene glycol dibutyl ether) ), Dipropylene glycol methyl ether acetate, ethylene glycol dibutyrate, diethyl succinate, and ethyl caprate must be used. It is most preferable to use the butyl diglyme.

The content of the solvent may be 10 to 50% by weight, or 15 to 35% by weight, based on the total weight of the ink composition. If the content is less than 10% by weight, the coating properties may be reduced because the solvent content is insufficient, and if the content is more than 50% by weight, the content of the solvent that does not participate in the reaction is too high, which may interfere with polymerization, resulting in curing. Sensitivity may decrease or voids may form.

Additionally, the ink composition used in the present invention may contain a surfactant.

Commercially available surfactants can be used, for example, BYK's BYK-307, BYK-310, BYK-320, BYK-331, BYK-333, BYK-344, BYK-350, BYK-354, BYK- 355, BYK-356, BYK-358N, BYK-359, BYK-361N, BYK-381, BYK-370, BYK-371, BYK-373, BYK-378, BYK-388, BYK-392, BYK-394, BYK-SILCLEAN 3700, BYK-SILCLEAN 3710, BYK-UV 3570 or TEGO ^® Wet 500, TEGO ^® Wet 280, TEGO ^® Wet 260, TEGO ^® Wet 270, TEGO ^® Wet 240, TEGO ^® Wet KL 245, TEGO ^® from TEGO Glide 100, TEGO ^® Glide 110, TEGO ^® Glide 130 ^, TEGO ^® Glide 406, TEGO ® Glide 410, TEGO ^® Glide 411, TEGO ^® Glide 415, TEGO ^® Glide 432, TEGO ^® Glide 435, TEGO ^® Rad 2010, TEGO ^® One selected from the group consisting of Rad 2011, TEGO ^® Rad 2100, TEGO ^® Rad 2200 N, TEGO ^® Rad 2250, TEGO ^® Rad 2500 and TEGO ^® Rad 2700 can be used.

The content of the surfactant may be 0.05 to 5% by weight, or 0.1 to 2% by weight, based on the total weight of the ink composition. If the content of the surfactant is less than 0.05% by weight, the spreadability of the ink is not controlled to the desired level, resulting in difficulty in printing precise patterns, and if the content exceeds 5% by weight, the surfactant is used in excess and the composition There is a problem in that the compatibility and defoaming properties are rather reduced.

The ink composition used in the present invention may include a photopolymerization initiator.

The ink composition of the present invention contains, as a cationic photopolymerization initiator, a compound that produces cationic species or Bronsted acid upon irradiation of ultraviolet rays, such as an iodonium salt or a sulfonium salt, but is necessarily limited thereto. It doesn't work.

The iodonium salt or sulfonium salt causes a curing reaction in which monomers having unsaturated double bonds contained in the ink react to form a polymer during the ultraviolet curing process, and a photosensitizer may be used depending on the polymerization efficiency.

For example, the photopolymerization initiator may have an anion represented by SbF ₆ -, AsF ₆ -, BF ₆ -, (C ₆ F ₅ ) ₄ B-, PF ₆ - or RfnF _6-n , but is necessarily limited thereto. It doesn't work.

The photopolymerization initiator is preferably included in 1 to 15% by weight, more preferably 2 to 10% by weight, based on the total weight of the ultraviolet curable ink composition. If the photopolymerization initiator content is less than 1% by weight, the curing reaction is not sufficient, and if it is more than 15% by weight, the photopolymerization initiator may not be completely dissolved or the viscosity may increase, resulting in reduced coating properties.

In addition, the ink composition used in the present invention may include ingredients commonly used in the art, such as photosensitizers and adhesion enhancers, in addition to the ingredients described above.

For example, the ink composition has a viscosity of 1 cP to 50 cP at 25°C, more preferably 1 cp to 30 cp at 25°C, making it suitable for the inkjet process. The ultraviolet curable ink composition having the above viscosity range has good ejection at the process temperature.

The ultraviolet curable ink composition used in the present invention spreads within a short time immediately after inkjet printing, exhibits excellent film properties, and hardens to exhibit excellent adhesive properties. Therefore, when applying the ultraviolet curable ink composition, it is desirable to install a UV-lamp immediately behind the inkjet head to enable curing at the same time as inkjet printing.

The ultraviolet curable ink composition has a curing dose of 1 to 10,000 mJ/cm2, preferably 100 to 3,000 mJ/cm2. The ultraviolet curable ink composition is cured by absorbing radiation in a wavelength range of 250 nm to 450 nm, preferably 360 nm to 410 nm.

Additionally, the present invention provides a parallax barrier pattern formed by the above manufacturing method.

The barrier pattern may have a thickness measured after curing of 0.1 ㎛ to 20 ㎛, or 0.5 ㎛ to 5 ㎛. The parallax barrier pattern of the present invention has the above-described characteristics, so that it does not exhibit short-circuiting due to large step differences, generation of bubbles, or deterioration in viewing quality due to release of the film.

The optical density of the parallax barrier pattern is 0.05 to 2.5 based on a film thickness of 1.0 μm, and may be 0.1 to 1.0, if necessary. In this case, there is an advantage in that the shielding characteristics due to the pattern are excellent. If the optical density exceeds 2.5, the required amount of pigment to be added becomes very high, which may have a negative effect on ink manufacturing and inkjet processes, and may inhibit curing of the ultraviolet curable ink composition by radiation.

Additionally, the present invention provides a multi-view display panel including the parallax barrier pattern.

Hereinafter, the operation and effects of the invention will be described in more detail through specific examples of the invention. However, this is presented as an example of the invention and the scope of the invention is not limited in any way.

Example

Reference Example 1: Preparation of inkjet composition

Pigment Black 6 as a colorant, Celoxide 2021P (manufactured by Daicel) as an epoxy monomer, Aaron Oxetane 221 (manufactured by TOAGOSEI) as an oxetane monomer, Bupyl Diglyme (manufactured by BASF) as a solvent, Omnicat as a photopolymerization initiator. 250 (manufactured by IGM Resin) and BYK-373 (manufactured by BYK) as a surfactant were added to the reactor in the proportions (% by weight) shown in Table 1 below, and stirred and mixed for 6 hours to prepare Composition A. In Table 1, the content of each ingredient is expressed as weight percent based on the total composition.

coloring agent epoxy
monomer oxetane
monomer menstruum Surfactants light curing
initiator Composition A 15 10 35 30 2.5 7.5

<Manufacturing example>

Using the composition A, an inkjet printer (UJ-200, manufactured by Unijet) was used to print fine prints on a substrate under the conditions of printing voltage (2-8-2 us, 100V), printing head temperature of 40°C, and driving speed of 1000 Hz. A line pattern was formed. The substrate uses a fully bonded display LCD panel, or uses borosilicate glass or alkali-resistant glass manufactured for displays. To remove contamination caused by foreign substances during the manufacturing process, it was cleaned with UV ozone for 5 minutes. A parallax barrier pattern was formed by curing the linear pattern formed by inkjet printing by irradiating ultraviolet rays. A UV LED lamp was used as the ultraviolet irradiator, and a light amount of about 2000 mJ/cm ² was irradiated based on the UVV wavelength of the integrated photometer. UV Power Puck 2 (EIT) was used to measure the light amount.

<Example 1>

Using the composition A, printing was performed using an inkjet process on a glass substrate as described in the preparation example. As a result, a barrier pattern with a taper angle of 4.30° and a barrier pattern width of 200.3 μm was implemented. The effective barrier width was 42.3 μm, the barrier effective rate was 21.1%, and low crosstalk was observed.

<Example 2>

A barrier pattern was formed as in Example 1, except that a barrier pattern with a taper angle of 4.34° and a pattern width of 224.4 μm was implemented. The barrier effective width increased to 103.7 μm, and the barrier effective rate accordingly increased to 46.2%, showing low crosstalk.

<Example 3>

A barrier pattern was formed as in Example 1, except that a barrier pattern with a taper angle of 4.53° and a pattern width of 283.6 μm was implemented. The barrier effective width increased to 157.0 μm, and the barrier effective rate accordingly increased to 55.3%, showing low crosstalk.

<Example 4>

Using Composition A, an ITO (Indium Tin Oxide) target was deposited on glass to a thickness of 250 Å by sputtering as described in the Preparation Example, and printing was performed using an inkjet process on a substrate obtained. As a result, as shown in Figure 5, a taper angle of 8.19°, which is higher than that of the glass substrate, was obtained, and although the effective barrier width was reduced to 153.0 μm, the barrier effective rate was high at 65.8% and low crosstalk was shown.

<Example 5>

The glass substrate is hydrophobized by surface treating it with plasma using C ₄ F ₈ for 10 to 30 seconds. Using the composition A, printing was performed using an inkjet process on the hydrophobized organic substrate as described in the preparation example. As a result, as shown in Figure 5, a high taper angle of 8.18° was obtained, and although the barrier effective width was reduced to 84.5 μm, the barrier effective rate was high at 63.6% and low crosstalk was observed.

<Comparative Example 1>

A barrier pattern was formed as in Example 1, except that a barrier pattern with a taper angle of 3.90° and a pattern width of 159.0 μm was implemented. The barrier pattern height was only 2.3 μm, and the effectiveness rate was only 0%, resulting in high crosstalk.

<Comparative Example 2>

A barrier pattern was formed as in Example 1, except that a wide barrier pattern was implemented with a pattern width of 434.7 μm. The barrier effectiveness rate reached 81.7%, but because the pixel density was relatively low, it did not fit the recent trend toward higher resolution.

<Experimental example>

Measurement of barrier effective height

The effective height of the barrier pattern formed by Composition A can be calculated as follows. A light blocking rate of 99.5% is required to prevent crosstalk, and the optical density (OD) at this time is 2.3. Composition A has an OD of 2.3 at a film thickness of 3.2 μm, resulting in an effective height. Film thickness was measured using a contact surface profile meter (KLA Tencor, ASIQ), and thin film OD was measured using an X-rite 341C.

The dimensions and shape of the printed barrier pattern, that is, barrier width, barrier height, and taper angle, were measured as shown in FIG. 3 using a contact surface profile measuring device. The taper angle was calculated using a trigonometric function (tangent distance/height) from the height change at a distance of about 100 μm from the starting point of the barrier pattern. The effective width can be calculated from the surface profile data from the width of the region with a height greater than 3.2 μm. As shown in Figure 4, the taper angle and barrier effectiveness rate at various pattern widths were calculated.

Here, the barrier effectiveness rate is the value obtained by dividing the barrier effective width by the barrier pattern width.

Crosstalk evaluation

The crosstalk of the barrier pattern can be evaluated as follows. Measure the luminance for each viewing angle with the pixels that implement the image light from the driver's perspective and the image light from the passenger's perspective driven in all black, all white, or black/white or white/black respectively. And it can be defined as that ratio. The crosstalk value is calculated according to the formula below.

In the above equation,

L _P is the luminance when the driver/passenger pixels are driven in black/white respectively,

L _D is the luminance when the driver/passenger pixels are driven in white/black respectively,

L _BK is the luminance when all driver/passenger pixels are driven in black,

XT _P is the crosstalk value in the passenger's field of view.

XT _D is the crosstalk value in the driver's field of view.

If the value obtained by subtracting L _BK from L _D is divided by the value obtained by subtracting L _BK from L _P , the crosstalk value from the passenger's point of view becomes XT _P (θ). Conversely, if you divide the value obtained by subtracting L _P from L _BK by the value obtained by subtracting L _BK from L _D , the crosstalk value at the time of the XT _D (θ) driver becomes. The luminance measures the ratio of omnidirectional luminance while moving from the driver side (-30 degrees) to the passenger side (+30 degrees). In this specification, when the crosstalk measurement value was less than 2.0%, the crosstalk was evaluated as 'low', and when it was more than 2.0%, the crosstalk was evaluated as 'high'.

Figure 6 shows the crosstalk measurement results of the barrier pattern implemented in Example 1 according to the above method. In Figure 6, as in Example 1, when the barrier effectiveness rate was 21.1%, the crosstalk was low at 1.45 to 1.47% (top Figure), as in Comparative Example 1, the crosstalk when the barrier effectiveness rate is 0% shows a high result of 3.07 to 3.09% (figure below).

The formation conditions and experimental results of the parallax barrier patterns formed in the examples and comparative examples are shown in Table 2.

In order to prevent crosstalk in a parallax barrier pattern manufactured using an inkjet process, the light blocking characteristics of the barrier pattern must be sufficient. As shown in the table above, in the case of a glass substrate, when the barrier width is 200 to 300 μm and the taper angle is 4 to 10°, the ratio of the effective light blocking area of the barrier pattern reaches 20 to 60%, resulting in low crosstalk. It can be seen that it provides.

As the specific parts of the present invention have been described in detail above, it is clear to those skilled in the art that these specific techniques are merely preferred embodiments and do not limit the scope of the present invention. something to do. Accordingly, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

Claims (9)

Applying a parallax barrier pattern on a substrate using an ink composition; and
Curing the applied composition to form a parallax barrier pattern,
The taper angle of the parallax barrier pattern is 4° to 10°,
The barrier pattern width is 100 to 300 μm,
The effective barrier width of the barrier pattern is 42.3 to 157.0 ㎛,
The barrier effectiveness rate of the barrier pattern is 20 to 80%,
The ink composition includes an alicyclic epoxy monomer, an oxetane monomer, a colorant, a solvent, a surfactant, and a photopolymerization initiator, and the solvent is a solvent having a boiling point of 190 to 280°C. The method of claim 1, wherein the substrate includes a hydrophilic substrate or a hydrophobic substrate. The method of claim 2, wherein the hydrophilic substrate includes an organic substrate. The parallax barrier pattern of claim 2, wherein the hydrophobic substrate includes a glass substrate treated with hydrophobic plasma using a gas containing a fluorocarbon-based gas or a glass substrate on which ITO (Indium Tin Oxide) is deposited. Manufacturing method. delete delete The method of claim 1, wherein the solvent is butyl diglyme (or diethylene glycol dibutyl ether), dipropylene glycol methyl ether acetate, ethylene glycol dibutyrate, A method of manufacturing a parallax barrier pattern selected from the group consisting of diethyl succinate and ethyl caprate. A parallax barrier pattern formed by the method according to any one of claims 1 to 4 and 7. A multi-visual display panel comprising a parallax barrier pattern according to claim 8.