TWI574083B - Liquid crystal display module and liquid crystal display comprising the same - Google Patents

Description

Liquid crystal display module and liquid crystal display including liquid crystal display module

The invention relates to a liquid crystal module and a liquid crystal display comprising the module.

The liquid crystal display is operated to emit light through the liquid crystal panel after receiving light from the backlight unit. Therefore, the liquid crystal display can provide good color quality on the front side thereof. However, the liquid crystal display exhibits a color quality, a contrast ratio, and a brightness uniformity attribute on its side surface lower than its front surface. In order to improve the color quality and contrast at the side surface of a liquid crystal display, various attempts have been made to develop an improved liquid crystal panel or liquid crystal structure.

As the screen size of liquid crystal displays continues to increase, the visible area of the liquid crystal display is significantly increased not only on the front side but also on the left and right sides, resulting in a significant decrease in the contrast of the lateral side compared to the contrast on the front side. In addition, as the size of the liquid crystal display screen increases, the brightness uniformity of the liquid crystal display also decreases. Therefore, a separate liquid crystal display module must be provided according to the screen size, which reduces workability and economic feasibility.

According to an aspect of the invention, a liquid crystal display module may include: a liquid crystal display module, including: a first polarizing plate, a second polarizing plate, and the first polarizing plate and the second polarizing plate a liquid crystal panel, wherein the second polarizing plate includes a polarizer and an optical film formed on the polarizer, the optical film including a high refractive index pattern layer a high refractive index pattern layer having at least one engraved pattern, the low refractive index pattern layer having a filled pattern a filling pattern of at least a portion of the pattern, the high refractive index pattern layer having a higher refractive index than the low refractive index pattern layer; and the optical film being disposed such that light emitted from the liquid crystal panel enters The low refractive index pattern layer is then emitted through the high refractive index pattern layer.

According to an embodiment of the invention, the liquid crystal panel is a panel that is patterned in a vertical alignment mode.

According to an embodiment of the invention, the engraving pattern has an aspect ratio of 1.0 or less.

According to an embodiment of the invention, the engraving pattern comprises a lenticular lens pattern, a 稜鏡 pattern having a triangular to decagon cross section, or a rib having a triangular to decagon cross section and a curved surface at the top of the engraving pattern Mirror pattern.

According to an embodiment of the invention, the high refractive index pattern layer has a ratio of a maximum pitch to a period of the engraved pattern of 0.5 or less.

According to an embodiment of the invention, the high refractive index pattern layer further includes a flat portion between the engraved patterns.

According to an embodiment of the invention, the low refractive index pattern layer has a refractive index of less than 1.50.

According to an embodiment of the invention, the high refractive index pattern layer has a refractive index of 1.50 or more.

According to an embodiment of the invention, the filling pattern fills the engraving pattern.

According to an embodiment of the invention, the second polarizing plate further includes a second protective layer, and the polarizer, the low refractive index pattern layer, the high refractive index pattern layer, the second protective layer, and The functional layers are sequentially formed in this order.

According to an embodiment of the invention, the second polarizing plate further includes a second protective layer, and the polarizer, the second protective layer, the low refractive index pattern layer and the high refractive index pattern layer are pressed This order is sequentially formed, the low refractive index pattern layer contacting the second protective layer, and the high refractive index pattern layer is directly formed on the low refractive index pattern layer.

According to an embodiment of the invention, the second protective layer is formed of at least one of polyethylene terephthalate, triacetyl cellulose, acrylic acid, and a cyclic olefin polymer resin.

According to an embodiment of the invention, the liquid crystal display module further comprises a composite optical sheet, wherein the composite optical sheet emits light at an exit angle of -40° to +40°.

According to an embodiment of the invention, at least one of the high refractive index pattern layer and the low refractive index pattern further comprises a light diffusing agent.

According to another aspect of the present invention, a liquid crystal display may include a liquid crystal display module as described above.

The liquid crystal display module provided by the invention can increase the side contrast, the side viewing angle and the brightness uniformity, and at the same time minimize the variation of the brightness uniformity caused by the screen size of the liquid crystal display, thereby ensuring excellent workability and economic feasibility.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to provide a thorough understanding of the invention. It should be understood that the present invention may be embodied in different ways and is not limited to the embodiments described below. In the drawings, portions that are not related to the description will be omitted for clarity. Throughout the specification, like elements will be referred to by like reference numerals.

As used herein, spatially relative terms such as "upper" and "lower" are defined with reference to the drawings. Therefore, it should be understood that "upper" and "lower" are used interchangeably. It will be understood that when a layer is referred to as being "on" another layer, the layer can be formed directly on the other layer or the intervening layer can also be present. Therefore, it will be understood that when a layer is referred to as "directly on" another layer, the intervening layer is not interposed.

The terms "horizontal direction" and "vertical direction" as used herein mean the longitudinal direction and the lateral direction of a rectangular screen of a liquid crystal display, respectively.

The term "side surface" as used herein means a region in which the range of θ is between 60° and 90° (Φ, θ) in a spherical coordinate system, wherein the front surface passes (0°, 0) with reference to the horizontal direction. °) indicates that the left endpoint is indicated by (180°, 90°) and the right endpoint is indicated by (0°, 90°).

The term "exit angle" as used herein means the angle of a point of a liquid crystal display, where the brightness becomes half the brightness of the front of the liquid crystal display (by indicating -90° to +90°) The brightness value at each point is normalized.) When the front side of the liquid crystal display constructed by assembling the light source, the light guide plate, and the liquid crystal display module is indicated by 0°, referring to the horizontal direction in FIG. 12, its The left side is indicated by the negative (-) direction, its right side is indicated by the positive (+) direction, its left endpoint is indicated by -90°, and its right endpoint is indicated by +90°. In Fig. 12, the value indicated by * is the exit angle.

The term "aspect ratio" as used herein refers to the ratio of the maximum height of the optical structure to the maximum spacing of the optical structure (maximum height/maximum spacing).

The term "period" as used herein means the sum of the pitch of one engraved pattern in the optical film and the pitch of one flat portion.

As used herein, "in-plane retardation" is expressed as Equation A, and "out-of-plane retardation" is expressed as Equation B: <equation A> Re = (nx - ny) xd <Equation B> Rth = ((nx + ny)/2 - nz) xd (where nx, ny, and nz are the slow axis direction, the fast axis direction, and The refractive index at a wavelength of 550 nm in the thickness direction, and d is the thickness (in nanometers) of the corresponding optical device.

The term "brightness uniformity" as used herein is a value calculated by {(minimum brightness) / (maximum brightness)} x 100. Here, referring to FIG. 13, in a liquid crystal display constructed by assembling a light source, a light guide plate, and a liquid crystal display module, brightness is measured at each of points A, B, and C, wherein the center point and the left end of the screen are displayed. The point and the right end point are indicated by B, A, and C, respectively, and the maximum brightness value (Brightness max) and the minimum brightness value (Brightness min) are obtained. When measuring the brightness, the brightness tester EZ CONTRAST X88RC (EZXL-176R-F422A4, ELDIM Co., Ltd.) is fixed to point B, and then directed to face points A, B and Every one of C. In Fig. 13, A, B, and C are placed on the same line.

As used herein, the term "(meth)acrylyl" refers to propylene and/or methacryl.

The term "top portion" as used herein refers to a portion of the uppermost portion relative to the lowermost portion of a structure.

Hereinafter, a liquid crystal display module according to an embodiment of the present invention will be described with reference to FIGS. 1 through 3. 1 is a schematic cross-sectional view of a liquid crystal display module according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a second polarizing plate of the liquid crystal display module shown in FIG. 1, and FIG. 3 is FIG. A partially exploded perspective view of the optical film of the liquid crystal display module shown.

Referring to FIG. 1, a liquid crystal display module 1 according to this embodiment may include a first polarizing plate 20, a liquid crystal panel 30, and a second polarizing plate 100.

The first polarizing plate 20 may be disposed on a lower surface of the liquid crystal panel 30, and may polarize light entering the first polarizing plate 20. The first polarizing plate 20 may include a first polarizer and a first protective layer.

The first polarizer may polarize light entering the first polarizer and may include a typical polarizer known to those skilled in the art, such as a polyvinyl alcohol polarizer obtained by stretching a polyvinyl alcohol film in a uniaxial direction. Or a polyene polarizer obtained by dehydrating a polyvinyl alcohol film.

The first protective layer may be formed on the first polarizer to protect the first polarizer. The first protective layer can be an isotropic optical film. The term "isotropic optical film" as used herein may mean a film of substantially the same nx, ny and nz, and the expression "substantially identical" may encompass two cases: the case where the values are identical and There is a slight difference between these values. At a wavelength of 550 nm, the first protective layer may have a Re of about 5 nm or less, specifically about 0.1 nm to about 5 nm. At a wavelength of 550 nm, the first protective layer may have an Rth of about 5 nm or less, specifically about 0.1 nm to about 5 nm. In these ranges of Re and Rth, the first polarizing plate can increase the contrast in both the vertical direction and the gradient direction.

Although not shown in FIG. 1, the first polarizing plate 20 may be attached to the liquid crystal panel 30 via an adhesive layer or an adhesive layer. The adhesive layer or adhesive layer can be formed from a composition comprising an adhesive resin and optionally comprising a crosslinking agent, a decane coupling agent, a photoradical initiator or a photocationic initiator. The adhesive layer or adhesive layer may further comprise a light diffusing agent for promoting diffusion of light. The light diffusing agent can comprise a typical light diffusing agent known to those skilled in the art.

The liquid crystal panel 30 may be disposed between the first polarizing plate 20 and the second polarizing plate 100 and may be configured to allow light received from the first polarizing plate 20 to be transmitted through the second polarizing plate 100. The liquid crystal panel 30 may include a first substrate, a second substrate, and a liquid crystal layer, which is fixed between the first substrate and the second substrate, and functions as a display medium. The first substrate may include a color filter and a black matrix mounted thereon. The second substrate can include: switching means configured to control the optical characteristics of the liquid crystal; an injection line configured to supply a gate signal to the switching device; and a signal line for providing the source signal; a pixel electrode and a counter electrode. The liquid crystal layer may contain liquid crystals that are uniformly aligned when no electric field is applied. Specifically, the liquid crystal panel 30 may utilize a vertical alignment (VA) mode, a patterned vertical alignment (PVA) mode, or a super-patterned vertical alignment (S-PVA) mode.

The second polarizing plate 100 may be disposed on an upper surface of the liquid crystal panel 30 and may be configured to polarize and diffuse light received from the liquid crystal panel 30. With this configuration, the second polarizing plate 100 can improve various properties including contrast, brightness uniformity, and viewing angle at the side surface of the liquid crystal display while minimizing variations in brightness uniformity caused by the screen size of the liquid crystal display. The second polarizing plate 100 may include a second polarizer, an optical film, and a second protective layer.

Next, the second polarizing plate 100 according to this embodiment will be described with reference to FIGS. 2 and 3. Referring to FIGS. 2 and 3, the second polarizing plate 100 according to this embodiment may include a second polarizer 110, an optical film 120, and a second protective layer 130.

The second polarizer 110 may be formed on the liquid crystal panel 30, and may polarize light received from the liquid crystal panel 30. The second polarizer 100 can include the same or a different class of polarizers than the first polarizer.

The optical film 120 may be formed on the second polarizer 110 to be directly disposed on the second polarizer 110, and may diffuse the polarized light received from the second polarizer 110. Here, the optical film 120 may directly contact the second protective layer 130. With this configuration, the second polarizing plate can improve various properties including contrast, brightness uniformity, and viewing angle at the side surface while minimizing variations in brightness uniformity caused by the screen size of the liquid crystal display.

The optical film 120 may include a low refractive index pattern layer 121 and a high refractive index pattern layer 122. The optical film 120 may be disposed to the liquid crystal display module 1 such that light emitted from the liquid crystal panel 30 may enter the low refractive index pattern layer 121 and may then be emitted through the high refractive index pattern layer 122. With this structure, the optical film can greatly improve the contrast and viewing angle at the side surface of the liquid crystal display by improving the light diffusion effect.

Next, the optical film 120 according to this embodiment will be described in more detail with reference to FIGS. 2 and 3. Referring to FIGS. 2 and 3, the optical film 120 according to this embodiment may include a high refractive index pattern layer 122 and a low refractive index pattern layer 121, and the high refractive index pattern layer 122 includes at least one engraving pattern 127, and a low refractive index pattern layer 121. A fill pattern 125 filling at least a portion of the engraving pattern 127 is included.

The high refractive index pattern layer 122 can have a first plane 124, which can include one or more engraved patterns 127 and one or more flat portions 126. Although the optical film is shown in FIGS. 2 and 3 to include the engraving pattern 127 and the flat portion 126 which are alternately arranged one by one, the order of formation of the engraving pattern 127 and the flat portion 126 is not limited thereto. Referring to FIGS. 2 and 3, a lenticular lens pattern including a curved surface is shown as an engraved pattern 127. However, it should be understood that the invention is not limited thereto. The curved surface may serve as a lens for diffusing the polarized light received from the second polarizer 110 in such a manner that the light is refracted in various directions according to the position at which the light on the curved surface reaches. Surfaces can include spherical surfaces, parabolic surfaces, elliptical surfaces, hyperbolic surfaces, or amorphous surfaces. The engraving pattern 127 may be a serpentine pattern having a triangular to decagon cross section and a curved surface at the top thereof. Further, although the curved surface is illustrated in FIGS. 2 and 3 as having a smooth surface without roughness, the curved surface may further include roughness to improve the light diffusion effect. The engraving pattern 127 may have an aspect ratio (H3/P3) of about 1.0 or less, specifically about 0.4 to about 1.0, and more specifically about 0.7 to about 1.0. Referring to Figure 2, the aspect ratio means the ratio of the maximum height to the maximum spacing of the engraved pattern. The ratio of the sum of the maximum pitches P3 of the engraved patterns 127 to the total width A of the high refractive index pattern layers 122 (B/A) may range from about 40% to about 60%, specifically from about 45% to about 55%. Within these ranges of aspect ratio and width ratio, liquid crystal displays can improve various properties of the side surface including contrast, brightness uniformity, and viewing angle while minimizing variations in brightness uniformity caused by screen size.

Referring also to Figure 2, the engraved pattern 127 can have a pitch P3 of about 30 microns or less, specifically about 5 microns to about 20 microns. The engraved pattern 127 can have a maximum height H3 of about 20 microns or less, specifically about 15 microns or less, more specifically about 5 microns to about 15 microns, and more specifically about 5 microns to about 10 microns. In these ranges of pitch and height, the engraved pattern can provide a light diffusion effect.

The flat portion 126 may be disposed between the engraved patterns 127 to diffuse the light by the total engraving of the light by the engraving pattern 127 when the light reaches the flat portion 126. The pitch P4 of the flat portion 126 may be greater than the maximum pitch P3 of the engraved pattern 127 or the same as the maximum pitch P3 (P4 ≥ P3). The ratio (P3/P4) of the maximum pitch P3 of the engraving pattern 127 to the pitch P4 of the flat portion 126 may be about 1 or less. The ratio of the maximum pitch P3 of the engraving pattern 127 to the period C (P3/C) may be about 0.5 or less. Within these ranges, the high refractive index pattern layer 122 can ensure high light collection and diffusion effects. When light reaches the low refractive index pattern layer 121 and is not reflected by the flat portion 126 toward the filling pattern 125, the high refractive index pattern layer 122 may diffuse light, thereby improving the light diffusion effect. Further, the engraving patterns 127 may be arranged in a predetermined period, thereby further improving the light diffusion effect.

The high refractive index pattern layer 122 may have a refractive index of about 1.50 or more, specifically about 1.50 to about 1.60. Within this range, the high refractive index pattern layer 122 can provide a good light diffusion effect. The high refractive index pattern layer 122 may be formed of a UV curable composition, including at least one of (meth)acrylic acid, polycarbonate, anthrone, and epoxy resin, but is not limited thereto.

The low refractive index pattern layer 121 may be formed on the second polarizer 110, and may refract light in various directions according to the light incident position to diffuse the polarized light when receiving light from the second polarizer 110 in one direction.

The low refractive index pattern layer 121 may be formed of a material having a lower refractive index than the high refractive index pattern layer 122, and may have a refractive index of less than about 1.50, specifically, about 1.35 to less than about 1.50. Within this range, the low refractive index pattern layer 121 can ensure a good light diffusion effect and can be easily formed. The low refractive index pattern layer 121 may be formed of a composition containing a UV curable transparent resin. Specifically, the resin may contain at least one of (meth)acrylic acid, polycarbonate, anthrone, and epoxy resin, but is not limited thereto. The composition may further comprise a typical initiator for forming a patterned layer.

The low refractive index pattern layer 121 may include a second plane 123 that faces the first plane 124 of the high refractive index pattern layer 122 and may include at least one fill pattern 125. The fill pattern 125 may fill at least a portion of the engraved pattern 127 of the high refractive index pattern layer 122. The expression "filling at least a portion" as used herein may include a structure in which a filling pattern fills the engraving pattern 127 and a structure in which the filling pattern partially fills the engraving pattern 127. In the structure in which the filling pattern partially fills the engraving pattern, the remaining portion of the engraving pattern may be filled with air or a resin having a predetermined refractive index. Specifically, the refractive index of the resin may be the same as or higher than the refractive index of the low refractive index pattern layer, and the refractive index of the high refractive index pattern layer 122 is the same as or lower than the high refractive index pattern. The refractive index of layer 122. Although the filling pattern 125 and the engraving pattern 127 in the optical film shown in FIG. 3 extend in a strip shape, the filling pattern 125 and the engraving pattern 127 may be formed in a dot shape. The term "dot" as used herein means that the combination of the fill pattern and the engraved pattern is dispersed.

The difference in refractive index between the high refractive index pattern layer 122 and the low refractive index pattern layer 121 may be about 0.20 or less, specifically about 0.10 to about 0.20, more specifically about 0.10 to about 0.15. Within this range, the optical film ensures a collection of light and a diffusing effect.

Although not shown in FIGS. 2 and 3, at least one of the high refractive index pattern layer and the low refractive index pattern layer may contain a light diffusing agent. Therefore, the liquid crystal display can achieve an improvement in the viewing angle corresponding to the longitudinal direction of the horizontal direction of the display screen and the viewing angle corresponding to the lateral direction of the vertical direction of the display screen. Further, when the engraving pattern height is further reduced as compared with the height of the high refractive index pattern layer not containing the light diffusing agent, the viewing angle can be greatly improved. The light diffusing agent may comprise an organic light diffusing agent, an inorganic light diffusing agent, or a mixture thereof. The mixture of the organic light diffusing agent and the inorganic light diffusing agent can be advantageous for improving the diffusing rate and transmittance of the low refractive index pattern layer or the high refractive index pattern layer. These light diffusing agents can be used singly or as a mixture. The organic light diffusing agent may include at least one of (meth)acrylic acid particles, siloxane oxide particles, and styrene particles. The inorganic light diffusing agent may include at least one of calcium carbonate, barium sulfate, titanium oxide, aluminum hydroxide, vermiculite, glass, talc, mica, white carbon, magnesium oxide, and zinc oxide. In particular, the inorganic light diffusing agent can more advantageously prevent a decrease in whiteness while further improving the light diffusing ratio compared to a light diffusing agent containing only an organic light diffusing agent. The light diffusing agent is not limited to a specific shape and particle diameter. In particular, the light diffusing agent may comprise spherical crosslinked particles and may have an average particle size (D50) of from about 0.1 microns to about 30 microns, specifically from about 0.5 microns to about 10 microns, more specifically about 1 Micron to about 5 microns. Within this range, the light diffusing agent can achieve a light diffusing effect, increasing the surface roughness of the pattern layer so that the bonding strength with the second protective layer is not problematic, and good dispersion can be ensured. The light diffusing agent may be present in an amount of from about 0.1 wt% to about 20 wt% of the total of only the high refractive index pattern layer, only the low refractive index pattern layer or the high refractive index pattern layer and the low refractive index pattern layer, specifically about 1 wt% to about 15 wt%. Within this range, the light diffusing agent can ensure the light diffusion effect. When the low refractive index pattern layer utilizes a light diffusing agent, the refractive index of the resin can be selected in a wide range and the manufacturing cost can be reduced.

Next, the second protective layer 130 will be described in more detail. The second protective layer 130 may be formed on the high refractive index pattern layer 122 or the low refractive index pattern layer 121 to protect the optical film 120 while supporting the optical film 120. In FIG. 2, the second protective layer 130 may be formed directly on the high refractive index pattern layer 122. However, it should be understood that the invention is not limited thereto. Alternatively, the second protective layer 130 may be formed on the low refractive index pattern layer 121. That is, FIG. 2 shows a structure in which the low refractive index pattern layer 121, the high refractive index pattern layer 122, and the second protective layer 130 are sequentially stacked in this order. However, in an alternative embodiment, the second protective layer 130, the low refractive index pattern layer 121, and the high refractive index pattern layer 122 may be sequentially stacked in this order, wherein the second protective layer 130 may be via the adhesive layer and the second polarizer 110. merge.

The second protective layer 130 may have a Re of about 8,000 nanometers or more, about 10,000 nanometers or more, specifically, more than about 10,000 nanometers, more specifically about 10,100 nanometers to about 15,000 nanometers. . Within this range, the second protective layer 130 can prevent the rainbow spot from being seen. The second protective layer 130 may be a film formed by stretching an optically transparent resin in a uniaxial direction or a biaxial direction. Specifically, the optically transparent resin may comprise at least one polyester comprising polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, Polybutylene naphthalate or the like; acrylic resin; cellulose ester, comprising cyclic olefin polymer (COP), triacetyl cellulose (TAC), etc.; polyvinyl acetate; Polyvinyl chloride (PVC); polynorbornene, polycarbonate (PC), polyamine, polyacetal, polyphenylene ether, polyphenylene sulfide, polyfluorene, polyether oxime, poly aryl Ester and polyimine. The second protective layer may include a film formed by modifying the aforementioned resin. Modifications can include copolymerization, branching, crosslinking, or terminal molecular modification. The second protective layer 130 may be combined with the optical film 120. The term "combined" as used herein means a state in which the second protective layer 130 and the optical film 120 are not independently separated from each other.

Although not shown in FIG. 2, an adhesive layer may be formed between the second polarizer 110 and the optical film 120. In one embodiment, the adhesive layer may be formed of a photocurable adhesive comprising an epoxy resin, a (meth)acrylic monomer and a photoinitiator, or a water-based adhesive of polyvinyl alcohol. The adhesive layer may further comprise a light diffusing agent to improve the light diffusion effect.

Further, although not shown in FIG. 2, a functional layer may be further formed on the second protective layer 130. The functional layer may provide the second protective layer 130 with at least one of the following functions: anti-reflection, low reflection, hard coating, anti-glare, anti-fingerprint, anti-pollution, diffusion, and refraction functions. In one embodiment, the functional layer may be formed as a single layer on the second protective layer 130. For example, the functional layer may be formed on the second protective layer 130 by coating the composition for the functional layer on the second protective layer 130, or may be deposited on the second protective layer 130 via an adhesive layer or an adhesive layer. In another embodiment, the functional layer may be implemented through one surface of the second protective layer 130.

Further, although not shown in FIG. 2, in a structure in which the second protective layer 130, the low refractive index pattern layer 121, and the high refractive index pattern layer 122 may be sequentially stacked in this order, the functional layer may be in a high refractive index pattern. Layer 122 is formed as a separate layer. Referring to FIG. 4, the second polarizing plate 100' may include an optical film 120' including a high refractive index pattern layer 122', and one surface of the high refractive index pattern layer 122' is subjected to surface treatment to have a high refractive index. The surface of the patterned layer 122' provides at least one of the aforementioned functions. For example, the high refractive index pattern layer 122' may be formed such that one surface of the high refractive index pattern layer 122' has roughness, or a fine particle may be subjected to surface treatment such that one surface thereof becomes a functional layer.

Next, a method for manufacturing a second polarizing plate according to an embodiment will be described.

First, a stacked structure of the second protective layer and the optical film can be formed. Specifically, a resin for a high refractive index pattern layer may be coated on one surface of the second protective layer. Coating is not limited to a particular method. For example, coating can be performed by bar coating, spin coating, dip coating, roll coating, fluid coating, die coating, and the like. Next, the pattern can be transferred onto the coating using the pattern film on which the embossed filling pattern and the flat portion are formed. Thereafter, the resin for the low refractive index pattern layer may be coated and filled onto the transferred pattern, followed by curing. Curing can be performed by at least one of photo curing or thermal curing. Photocuring can be performed using light having a wavelength of about 400 m or less of about 10 mJ/cm ² to about 1000 mJ/cm ² . Thermal curing can be performed at about 40 ° C to about 200 ° C for about 1 hour to about 30 hours. Under these conditions, the resin for the pattern layer can be sufficiently cured.

Next, a second polarizer can be fabricated. The second polarizer can be manufactured by a typical method. In one embodiment, the second polarizer can be fabricated by inflating, stretching, and dyeing a polyvinyl alcohol film. Swelling, stretching and dyeing can be carried out by typical methods known to those skilled in the art. In another embodiment, the second polarizer can be fabricated by dehydrating a polyvinyl alcohol film.

Next, the second polarizing plate can be manufactured by applying a binder for the polarizing plate to one surface of the optical film of the stacked structure to form an adhesive layer, attaching the second polarizer to the optical film via the adhesive layer, and The adhesive layer is cured.

Next, a liquid crystal display module according to another embodiment of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view of a second polarizing plate according to another embodiment.

The liquid crystal display module according to this embodiment may include a first polarizing plate, a liquid crystal panel, and a second polarizing plate. The liquid crystal display module according to this embodiment is substantially the same as the liquid crystal display module according to the above embodiment, except that the liquid crystal display module according to this embodiment includes the second polarizing plate shown in FIG. 5 instead of FIG. The second polarizing plate shown in the drawing. The following description will focus on the second polarizing plate shown in FIG.

Referring to FIG. 5, the second polarizing plate 200 according to this embodiment includes a second polarizer 110, an optical film 140 including a low refractive index pattern layer 141 and a high refractive index pattern layer 142, and a second protective layer 130. The second polarizer 110 and the second protective layer 130 are substantially the same as the second polarizer and the second protective layer of the second polarizing plate according to the above embodiment, and thus the following description will focus on the optical film 140.

The optical film 140 may be disposed between the second polarizer 110 and the second protective layer 130 and may diffuse the polarized light received from the second polarizer 110. With this structure, the optical film can increase the contrast and viewing angle at the side surface of the liquid crystal display while improving the brightness uniformity of the liquid crystal display.

Referring to FIG. 5, the optical film 140 according to this embodiment may include a high refractive index pattern layer 142 and a low refractive index pattern layer 141. The high refractive index pattern layer 142 is formed with one or more engraved enamel patterns 144, a low refractive index pattern. The layer 141 has a fill pattern 143 on it that fills at least a portion of the engraved enamel pattern 144.

FIG. 5 shows a second polarizing plate comprising an engraved 稜鏡 pattern 144 having a triangular cross section. However, the second polarizing plate may include a meandering pattern having an n-sided (n is an integer from 4 to 10) cross section. Further, although the optical film shown in FIG. 5 does not include a flat portion, the optical film may further include a flat portion 126 as shown in FIG. 2 between the engraved 稜鏡 patterns 144. In some embodiments, roughness may be further formed on the engraved enamel pattern shown in FIG. 5 to further improve the light diffusion effect. In other embodiments, the engraved plaque pattern shown in Figure 5 may include a curved surface at the top thereof.

The engraved plaque pattern 144 can have a pitch P5 of from about 5 microns to about 20 microns, specifically from about 7 microns to about 15 microns. The engraved plaque pattern 144 can have a height H5 of from about 3 microns to about 16 microns, specifically from about 4 microns to about 16 microns. The engraved plaque pattern 144 may have an apex angle g of from about 55° to about 90°, specifically from about 65° to about 80°. The engraved plaque pattern 144 can have an aspect ratio of about 1.0 or less, specifically about 0.50 to about 0.96, and more specifically about 0.6 to about 0.8. In these ranges of pitch, height, apex angle, and aspect ratio, the engraved 稜鏡 pattern 144 can ensure a light diffusion effect.

Next, a liquid crystal display module according to another embodiment will be described with reference to FIG. Figure 6 is a cross-sectional view of a second polarizing plate in the liquid crystal display module according to this embodiment.

The liquid crystal display module according to this embodiment may include a first polarizing plate, a liquid crystal panel, and a second polarizing plate. The liquid crystal display module according to this embodiment is substantially the same as the liquid crystal display module according to the above embodiment, except that the liquid crystal display module according to this embodiment includes the second polarizing plate shown in FIG. 6 instead of FIG. The second polarizing plate shown in the drawing. The following description will focus on the second polarizing plate shown in FIG. 6.

Referring to FIG. 6, the second polarizing plate 300 according to this embodiment may include a second polarizer 110, an optical film 150 including a low refractive index pattern layer 151 and a high refractive index pattern layer 152, and a second protective layer 130. The high refractive index pattern layer 152 may include an engraved pattern 153 and a flat portion 154, and may further include a curved surface 155 formed at an interface between the engraved pattern 153 and the flat portion 154. With this structure, the second polarizing plate can provide a high light diffusion effect. The low refractive index pattern layer 151 may include a filling pattern 156 filling the engraving pattern 153.

Next, a liquid crystal display module according to still another embodiment of the present invention will be described with reference to FIG. Fig. 7 is a cross-sectional view showing a second polarizing plate of the liquid crystal display module according to this embodiment.

The liquid crystal display module according to this embodiment may include a first polarizing plate, a liquid crystal panel, and a second polarizing plate. The liquid crystal display module according to this embodiment is substantially the same as the liquid crystal display module according to the above embodiment, except that the liquid crystal display module according to this embodiment includes the second polarizing plate shown in FIG. 7 instead of FIG. The second polarizing plate shown in the drawing. The following description will focus on the second polarizing plate shown in FIG.

Referring to FIG. 7, the second polarizing plate 400 according to this embodiment may include a second polarizer 110, an optical film 160 including a high refractive index pattern layer 122 and a low refractive index pattern layer 161, and a second protective layer 130, wherein The refractive index pattern layer 122 includes an engraved pattern 127 and a flat portion 126. The second polarizing plate 400 according to this embodiment is substantially the same as the second polarizing plate shown in FIG. 2 except that the thickness of the low refractive index pattern layer 161 and the engraved pattern 127 in the second polarizing plate are 127 according to this embodiment. The height is the same.

Next, a liquid crystal display module according to still another embodiment of the present invention will be described with reference to FIG. Figure 8 is a cross-sectional view of a second polarizing plate of the liquid crystal display module according to this embodiment.

The liquid crystal display module according to this embodiment may include a first polarizing plate, a liquid crystal panel, and a second polarizing plate. The liquid crystal display module according to this embodiment is substantially the same as the liquid crystal display module according to the above embodiment, except that the liquid crystal display module according to this embodiment includes the second polarizing plate shown in FIG. 8 instead of FIG. The second polarizing plate shown in the drawing. The following description will focus on the second polarizing plate shown in FIG.

Referring to FIG. 8, the second polarizing plate 500 according to this embodiment may include a second polarizer 110, an optical film 120 including a low refractive index pattern layer 121 and a high refractive index pattern layer 122, a second protective layer 130, and a third protection. Layer 170. The second polarizing plate 500 according to this embodiment is substantially the same as the second polarizing plate shown in FIG. 2, except that the second polarizing plate 500 according to this embodiment further includes a third protective layer 170.

The third protective layer 170 may be formed on the lower surface of the second polarizer 110 to protect the second polarizer 110 while suppressing warpage of the second polarizing plate 500 under severe conditions together with the second protective layer 130.

The third protective layer 170 may be a film formed by stretching an optically transparent resin in a uniaxial direction or a biaxial direction. Specifically, the optically transparent resin may comprise at least one polyester comprising polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate Alcohol esters and the like; acrylic resin; cellulose ester, comprising a cyclic olefin polymer, triacetyl cellulose, etc.; polyvinyl acetate; polyvinyl chloride; polynorbornene, polycarbonate, polyamine, polycondensation Aldehydes, polyphenylene ethers, polyphenylene sulfides, polyfluorenes, polyether oximes, polyarylates, and polyimines. The third protective layer 170 may include a film formed by modifying the aforementioned resin. Modifications can include copolymerization, branching, crosslinking, or terminal molecular modification. The third protective layer 170 may have a predetermined delay distance to provide a viewing angle compensation function. Specifically, the third protective layer 170 may have a Re of about 40 nm to about 60 nm at a wavelength of 550 nm. Within this range, the third protective layer can compensate for the viewing angle to provide good image quality.

Although the optical film 120 is illustrated as being formed between the second protective layer 130 and the second polarizer 110 in FIG. 8, the optical film 120 may be formed between the second polarizer 110 and the third protective layer 170. That is, the second polarizing plate according to this embodiment may have a structure in which the third protective layer 170, the low refractive index pattern layer 121, the high refractive index pattern layer 122, the second polarizer 110, and the second protective layer 130 Formed in this order.

Although not shown in FIG. 8, an adhesive layer may be formed on the lower surface of the third protective layer 170 to facilitate adhesion between the third protective layer 170 and the liquid crystal panel 30. The details of the adhesive layer are the same as those of the above adhesive layer. Although not shown in FIG. 8, an adhesive layer may be formed between the second polarizer 110 and the third protective layer 170.

Next, a liquid crystal display module according to still another embodiment of the present invention will be described with reference to FIG. Figure 9 is a cross-sectional view of a second polarizing plate of the liquid crystal display module according to this embodiment.

The liquid crystal display module according to this embodiment may include a first polarizing plate, a liquid crystal panel, and a second polarizing plate. The liquid crystal display module according to this embodiment is substantially the same as the liquid crystal display module according to the above embodiment, except that the liquid crystal display module according to this embodiment includes the second polarizing plate shown in FIG. 9 instead of FIG. The second polarizing plate shown in the drawing. The following description will focus on the second polarizing plate shown in FIG.

Referring to FIG. 9, the second polarizing plate 600 according to this embodiment includes a second polarizer 110, an optical film 120 including a low refractive index pattern layer 121 and a high refractive index pattern layer 122, and a third protective layer 170. The second polarizing plate according to this embodiment is substantially the same as the second polarizing plate 500 shown in FIG. 8, except that the optical film 120 is disposed under the second polarizer 110 and formed directly on the third protective layer 170, and There is no second protective layer 130.

Next, a liquid crystal display module according to still another embodiment of the present invention will be described with reference to FIG. Figure 10 is a perspective view of a composite optical sheet of a liquid crystal display module according to this embodiment.

The liquid crystal display module according to this embodiment may include a composite optical sheet, a first polarizing plate, a liquid crystal panel, and a second polarizing plate. The liquid crystal display module according to this embodiment is substantially the same as the liquid crystal display module according to the above embodiment, but does not include a composite optical sheet. The composite optical sheet may be disposed under the first polarizing plate and collect light incident on a lower side thereof. The following description will focus on composite optical sheets.

Referring to FIG. 10, the composite optical sheet 10 according to this embodiment may include: a first optical sheet 12 including one or more first ruthenium patterns 11 formed on one surface thereof; and a second optical sheet 14 It is formed on the first optical sheet 12 and includes one or more second ruthenium patterns 13 formed on one surface thereof.

The composite optical sheet 10 can allow light to exit at an exit angle of from about -40° to about +40°, specifically from about -30° to about +30°, more specifically from about -28° to about +28°. Within this range of exit angles, the composite optical sheet can collect light before it exits through the liquid crystal panel by inhibiting light from exiting through the side surface of the composite optical sheet, thereby increasing the contrast at its side surfaces.

The first optical sheet 12 may be disposed on a lower surface of the second optical sheet 14. The first optical sheet 12 has a light exiting plane corresponding to its upper surface and a light incident plane corresponding to its lower surface to change the optical path of the incident light, thereby allowing light to exit to the second optical sheet 14. The first optical sheet 12 may include a first base film 15 and at least one first meander pattern 11 formed on the first base film 15.

The first substrate film 15 can support the first optical sheet 12 and have a thickness of from about 10 microns to about 500 microns, specifically from about 25 microns to about 250 microns, more specifically from about 75 microns to about 150 microns, but not Limited to this. Within this range, the first base film can be used for a liquid crystal display. The first base film 15 may be formed of a thermoplastic resin or a composition including a thermoplastic resin. Specifically, the thermoplastic resin may comprise at least one polyester resin such as polyethylene terephthalate and polyethylene naphthalate, polyacetal resin, acrylic resin, polycarbonate resin, styrene Resin, vinyl resin, polyphenylene ether resin, acyclic polyolefin resin (such as polyethylene and polypropylene), cycloolefin resin, acrylonitrile-butadiene-styrene copolymer resin, polyacrylate resin, polyfang Anthracene resin, polyether oxime resin, polyphenylene sulfide resin, fluororesin and (meth)acrylic resin.

The first meander pattern 11 may be formed on the upper surface of the first optical sheet 12, and collect light received from the lower surface thereof while improving brightness. Although FIG. 10 shows that the meandering pattern has a triangular cross section, it should be understood that the present invention is not limited thereto, and the first meandering pattern 11 may have a polygonal meander shape with a number of sides ranging from 4 to 10. The first meander pattern 11 can have a height H1 of from about 5 microns to about 50 microns, specifically from about 5 microns to about 40 microns, and more specifically from about 10 microns to about 30 microns. The first meander pattern 11 may have an apex angle (α) of from about 80° to about 100°, specifically from about 85° to about 95°. Within these height and apex angles, the first 稜鏡 pattern can improve brightness while suppressing the Moiré phenomenon. The first meander pattern 11 may have an aspect ratio of from about 0.3 to about 0.7, specifically from about 0.4 to about 0.6. Within this range, the first pattern can improve brightness. The first ruthenium pattern 11 may be formed of a composition containing a UV-curable unsaturated compound and an initiator, or may be formed of the same material as the material of the first base film 15 or a different material. For example, the UV curable unsaturated compound may comprise an epoxy (meth) acrylate, a urethane (meth) acrylate, a phenyl phenol ethoxylated (meth) acrylate, a trimethylol Propane ethoxylated (meth) acrylate, benzofluorene-derived unsaturated resin, phenoxybenzyl (meth) acrylate, phenylphenoxyethyl (meth) acrylate, di(methyl) At least one of ethoxylated thiodiphenyl acrylate, phenyl thioethyl (meth) acrylate monomer or a low polymer thereof, but is not limited thereto. The initiator may be a photoinitiator and may include a ketone or a phosphine oxide-based initiator, but is not limited thereto. The first meander pattern 11 may have an elongated shape extending in a strip shape, and the longitudinal direction of the first meandering pattern is substantially the same as the vertical direction thereof. As used herein, the expression "substantially the same" encompasses the case where the values are identical and the case where there is a slight difference between these values.

The second optical sheet 14 may be disposed on an upper surface of the first optical sheet 12 and may have a light exiting plane corresponding to an upper surface thereof and a light incident plane corresponding to a lower surface thereof to change reception from the first optical sheet 12 Optical path of light. The second optical sheet 14 may include a second base film 16 and a second ruthenium pattern 13 formed on the second base film 16.

The second substrate film 16 can support the second optical sheet 14, and can have a thickness of from about 10 microns to about 500 microns, specifically from about 25 microns to about 250 microns, and more specifically from about 75 microns to about 150 microns. Within this range, the second substrate film can be used for a liquid crystal display. The second base film 16 may be formed of the same resin as the first base film 15 or a different resin. The thickness of the second base film 16 may be the same as or different from the thickness of the first base film 15.

The second meander pattern 13 may be formed on the upper surface of the second optical sheet 14, and collect light received from the lower surface thereof while improving brightness. Although FIG. 10 shows that the meandering pattern has a triangular cross section, it should be understood that the present invention is not limited thereto, and the second meandering pattern 13 may have a polygonal meander shape with a number of sides ranging from 4 to 10. The second meander pattern 13 may be formed of the same or different kind of resin as the first meander pattern 11. The second meander pattern 13 can have a height H2 of from about 5 microns to about 50 microns, specifically from about 5 microns to about 40 microns, more specifically from about 10 microns to about 30 microns. The second meander pattern 13 may have an apex angle (β) of from about 80° to about 100°, specifically from about 85° to about 95°. In the range of these heights and apex angles, the second 稜鏡 pattern can improve the brightness while suppressing the ripple phenomenon. The second meander pattern 13 may have an aspect ratio of from about 0.3 to about 0.7, specifically from about 0.4 to about 0.6. Within this range, the second pattern can improve brightness. Prism range of the second pattern 13 is the aspect ratio (A ²⁾ and the aspect ratio (A ¹⁾ a first pattern 11 Prism ratio (A ² / A ¹⁾ may be between about 0.9 to about 1.1. Within this range, the second meander pattern 13 may allow light to exit at an exit angle of about -40° to about +40°, thereby improving contrast at the side surfaces. The second meander pattern 13 may have an elongated shape extending in a strip shape, and the longitudinal direction of the second meander pattern is substantially orthogonal to the longitudinal direction of the first meander pattern. As used herein, the expression "substantially orthogonal to" encompasses the case where the two directions are completely orthogonal to each other and the case where there is a slight difference therebetween.

The liquid crystal display module may further include a diffuser disposed between the composite optical sheet 10 and the first polarizing plate 20. The diffuser can protect the composite optical sheet 10 and can include a light diffusing agent. In this embodiment, the diffuser and light source may be disposed under the composite optical sheet 10 in sequence.

FIG. 10 shows a structure in which the second optical sheet 14 is stacked on the first optical sheet 12 with no adhesive layer therebetween. In another embodiment, the composite optical sheet may further include an adhesive layer formed on a lower surface of the second optical sheet 14, such that the first meander pattern 11 of the first optical sheet 12 may penetrate into the adhesive layer. The adhesive layer can prevent deformation of the first optical sheet and the second optical sheet, thereby preventing sheet wrinkling and waviness. The adhesive layer can be formed of a typical adhesive resin such as an acrylic or methacrylate resin. The adhesive layer can have a thickness of from about 1 micron to about 10 microns, specifically from about 2 microns to about 8 microns. Within this range, the adhesive layer ensures sufficient bond strength.

Next, a liquid crystal display according to an embodiment of the present invention will be described with reference to FIG. Figure 11 is a perspective view of a liquid crystal display according to this embodiment.

Referring to Fig. 11, a liquid crystal display 2 according to this embodiment may include a light source 40, a light guiding plate 60 guiding light emitted from the light source 40, a reflective sheet 50 disposed under the light guiding plate 60, and a diffusing sheet disposed above the light guiding plate 60. 70. A liquid crystal display module 80 disposed above the diffusing sheet 70, and a window film 90 disposed above the liquid crystal display module 80, wherein the liquid crystal display module 80 may include a liquid crystal according to an embodiment of the present invention. Display module.

The light source 40 can generate light and can be disposed at the side of the light guide plate 60 (sidelight type). The light source 40 can be a line light, a surface light or a variety of other light sources, such as a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED). The light source cover 41 may be disposed outside the light source 40.

The light guide plate 60 can guide the light emitted from the light source 40 to the diffusion sheet 70. When a direct type light source is used, the light guide plate can be omitted.

The reflective sheet 50 may reflect light emitted from the light source 40 to supply light toward the diffusing sheet 70.

The diffusing sheet 70 can diffuse and scatter light received from the light guiding plate 60 to supply light to the liquid crystal display.

Although the light source 40 is disposed on the side of the light guiding plate 60 in the liquid crystal display shown in FIG. 11, the light source 40 may be disposed on the lower surface of the light guiding plate 60 (direct type). In this configuration, the light guide plate 60 can be omitted and the liquid crystal display can further include a diffuser.

The invention will be described in more detail hereinafter with reference to some examples. However, it should be understood that these examples are provided for the purpose of illustration only, and are not to be construed as limiting the invention in any way.

Preparation Example 1: Fabrication of Composite Optical Sheets

A composition was prepared comprising 35 wt% epoxy acrylate, 15 wt% urethane acrylate oligomer, 36 wt% o-phenylphenol ethoxylated acrylate, 10 wt% three Hydroxymethylpropane 9-ethoxylated acrylate and 4 wt% photoinitiator.

The composition was applied to a polyethylene terephthalate (PET) film (T910E, thickness: 125 μm, Mitsubishi Co., Ltd.) for the first base film. A surface is formed to form a coating. A 稜鏡 pattern (triangular cross section, height: 12 μm, pitch: 24 μm, apex angle: 90°) was transferred from a pattern roll having an embossed pattern corresponding to the 稜鏡 pattern to the coating, followed by solidification, thereby forming A first optical sheet on which the first meander pattern is formed.

The composition was applied to a polyethylene terephthalate (PET) film (T910E, thickness: 125 μm, Mitsubishi Co., Ltd.) for the second under film. A surface is formed to form a coating. A 稜鏡 pattern (triangular cross section, height: 12 μm, pitch: 24 μm, apex angle: 90°) was transferred from a pattern roll having an embossed pattern corresponding to the 稜鏡 pattern to the coating, followed by solidification, thereby forming A second optical sheet having a second meander pattern formed thereon.

The composite optical sheet is manufactured by stacking the second optical sheets on the first optical sheet such that the longitudinal direction of the first meander pattern is orthogonal to the longitudinal direction of the second meander pattern.

The exit angle is measured by a method of measuring the viewing angle with respect to the composite optical sheet.

Preparation Example 2: Fabrication of Composite Optical Sheets

The composite optical sheet was produced in the same manner as in Preparation Example 1, except that the microlens pattern listed in Table 1 was formed on a polyethylene terephthalate (PET) film for the first base film. On the surface, not the enamel pattern.

<Table 1>

Preparation Example 3: Fabrication of First Polarizing Plate

The first polarizer was fabricated by stretching a polyvinyl alcohol film to three times its original length at 60 ° C, and adsorbing iodine onto the stretched film, followed by an aqueous solution of boric acid at 40 ° C. The resulting film was stretched to 2.5 times the stretched length of the film. Adhesive (Z-200, Nippon Goshei Co., Ltd.) for the polarizer is used to bond the triacetyl cellulose film (having a thickness of 80 μm) as a first protective layer to the first polarizer. Two surfaces, thereby providing a first polarizing plate.

Example 1: Manufacturing of a liquid crystal display module

(1) Manufacture of the second polarizing plate

The polarizer was fabricated in the same manner as in Preparation Example 3.

A UV curable resin (SSC155, Shin-A T&C) was applied to a transparent PET film for a second protective layer (SRF, thickness: 80 μm, Re=14000 nm at a wavelength of 550 nm, Toyobo Co., One surface of Ltd.)) to form a coating. An engraved lenticular lens pattern and a flat portion are formed on the coating layer using a film having an embossed lenticular lens pattern (pitch: 10 μm, height: 10 μm) and a flat portion (pitch: 10 μm) alternately formed thereon, followed by curing, Thereby, a high refractive index pattern layer is formed. Next, a UV curable resin (SSC140, Shin-A T&C) is applied onto the high refractive index pattern layer so that the engraved lenticular lens pattern can be filled with the UV curable resin, followed by curing, thereby forming a direct formation on the high refractive index pattern layer. An optical film of a low refractive index pattern layer.

A polarizing plate adhesive (Z-200, Nippon Synthetic Chemical Co., Ltd.) is applied onto one surface of the low refractive index pattern layer, and the low refractive index pattern layer is bonded to the manufactured polarizer, followed by curing, thereby manufacturing The second polarizing plate.

(2) Manufacturing of liquid crystal display module

The composite optical sheet manufactured in Preparation Example 1, the first polarizing plate manufactured in Preparation Example 3, the liquid crystal panel (PVA mode), and the manufactured second polarizing plate were assembled in this order, thereby manufacturing a liquid crystal display module.

Example 2: Manufacturing of a liquid crystal display module

(1) Manufacture of the second polarizing plate

The polarizer was fabricated in the same manner as in Preparation Example 3.

A UV curable resin (SSC155, Shin-A T&C) was applied to a transparent PET film for a second protective layer (SRF, thickness: 80 μm, Re=14000 nm at a wavelength of 550 nm, Toyobo Co., One surface of Ltd.)) to form a coating. Using a film having an embossed enamel pattern (pitch: 13 μm, height: 10 μm, apex angle: 65.5°, triangular cross section) formed thereon, an engraved enamel pattern is formed on the coating, followed by curing, thereby forming a high Refractive index pattern layer. Next, a UV curable resin (SSC140, Shin-A T&C) is applied onto the high refractive index pattern layer so that the engraved enamel pattern can be filled with the UV curable resin, followed by curing, thereby forming a direct formation on the high refractive index pattern layer. An optical film of a low refractive index pattern layer.

A polarizing plate adhesive (Z-200, Nippon Synthetic Chemical Co., Ltd.) is applied onto one surface of the low refractive index pattern layer, and the low refractive index pattern layer is bonded to the manufactured polarizer, followed by curing, thereby manufacturing The second polarizing plate.

(2) Manufacturing of liquid crystal display module

The composite optical sheet manufactured in Preparation Example 1, the first polarizing plate manufactured in Preparation Example 3, the liquid crystal panel (PVA mode), and the manufactured second polarizing plate were assembled in this order, thereby manufacturing a liquid crystal display module.

Example 3: Manufacturing of a liquid crystal display module

The polarizer was fabricated in the same manner as in Preparation Example 3.

A UV curable resin (SSC155, Shin-A T&C) was applied to a transparent PET film for a second protective layer (SRF, thickness: 80 μm, Re=14000 nm at a wavelength of 550 nm, Toyobo Co., One surface of Ltd.)) to form a coating. An engraved lenticular lens pattern and a flat portion are formed on the coating layer using a film having an embossed lenticular lens pattern (pitch: 10 μm, height: 10 μm) and a flat portion (pitch: 10 μm) alternately formed thereon, followed by curing, Thereby, a high refractive index pattern layer is formed. Next, a UV curable resin (SSC143, Shin-A T&C) is applied onto the high refractive index pattern layer so that the engraved lenticular lens pattern can be filled with the UV curable resin, followed by curing, thereby forming a direct formation on the high refractive index pattern layer. An optical film of a low refractive index pattern layer.

A polarizing plate adhesive (Z-200, Nippon Synthetic Chemical Co., Ltd.) was applied to a TAC film for a low refractive index pattern layer and a third protective film (KC4DR-1, thickness: 40 μm, Konica Corporation) On one surface of each of Co., Ltd.)), the low refractive index pattern layer and the TAC film are bonded to the fabricated polarizer, followed by curing, thereby fabricating a second polarizing plate.

The composite optical sheet manufactured in Preparation Example 1, the first polarizing plate manufactured in Preparation Example 3, the liquid crystal panel (PVA mode), and the manufactured second polarizing plate were assembled in this order, thereby manufacturing a liquid crystal display module.

Example 4: Manufacturing of a liquid crystal display module

The polarizer was fabricated in the same manner as in Preparation Example 3.

A UV curable resin (SSC155, Shin-A T&C) was applied to a transparent PET film for a second protective layer (SRF, thickness: 80 μm, Re=14000 nm at a wavelength of 550 nm, Toyobo Co., One surface of Ltd.)) to form a coating. Using a film having an embossed enamel pattern (pitch: 13 μm, height: 10 μm, apex angle: 65.5°, triangular cross section) formed thereon, an engraved enamel pattern is formed on the coating, followed by curing, thereby forming a high Refractive index pattern layer. Next, a UV curable resin (SSC143, Shin-A T&C) is applied onto the high refractive index pattern layer so that the engraved enamel pattern can be filled with the UV curable resin, followed by curing, thereby forming a direct formation on the high refractive index pattern layer. An optical film of a low refractive index pattern layer.

A polarizing plate adhesive (Z-200, Nippon Synthetic Chemical Co., Ltd.) was applied to a TAC film for a low refractive index pattern layer and a third protective film (KC4DR-1, thickness: 40 μm, Konica Corporation) On one surface of each of Co., Ltd.)), the low refractive index pattern layer and the TAC film are bonded to the fabricated polarizer, followed by curing, thereby fabricating a second polarizing plate.

The composite optical sheet manufactured in Preparation Example 1, the first polarizing plate manufactured in Preparation Example 3, the liquid crystal panel (PVA mode), and the manufactured second polarizing plate were assembled in this order, thereby manufacturing a liquid crystal display module.

Example 5: Manufacturing of a liquid crystal display module

(1) Manufacture of the second polarizing plate

The polarizer was fabricated in the same manner as in Preparation Example 3.

A composition for a high refractive index pattern layer was prepared by mixing 100 parts by weight of a UV curable resin (SSC157, Shin-A T&C) and 4 parts by weight of an anthrone-based light diffusing agent (particle size: 4 μm, Momentive, Tospearl 145), then dispersed.

The prepared composition was applied to a transparent PET film for a second protective layer (SRF, thickness: 80 μm, Re=14,000 nm at a wavelength of 550 nm, Toyobo Co., Ltd.) The surface is formed to form a coating. An engraved lenticular lens pattern and a flat portion are formed on the coating layer using a film having an embossed lenticular lens pattern (pitch: 10 μm, height: 10 μm) and a flat portion (pitch: 10 μm) alternately formed thereon, followed by curing, Thereby, a high refractive index pattern layer is formed. Next, a UV curable resin (SSC140, Shin-A T&C) is applied onto the high refractive index pattern layer so that the engraved lenticular lens pattern can be filled with the UV curable resin, followed by curing, thereby forming a direct formation on the high refractive index pattern layer. An optical film of a low refractive index pattern layer.

A polarizing plate adhesive (Z-200, Nippon Synthetic Chemical Co., Ltd.) is applied onto one surface of the low refractive index pattern layer, and the low refractive index pattern layer is bonded to the manufactured polarizer, followed by curing, thereby manufacturing The second polarizing plate.

(2) Manufacturing of liquid crystal display module

The composite optical sheet manufactured in Preparation Example 1, the first polarizing plate manufactured in Preparation Example 3, the liquid crystal panel (PVA mode), and the manufactured second polarizing plate were assembled in this order, thereby manufacturing a liquid crystal display module.

Example 6: Manufacturing of a liquid crystal display module

The liquid crystal display module was fabricated in the same manner as in Example 5 except that the light diffusing agent content changes as listed in Table 3.

Example 7: Manufacturing of a liquid crystal display module

The liquid crystal display module was fabricated in the same manner as in Example 6, except that the light diffusing agent content changes as listed in Table 3.

Example 8: Manufacturing of a liquid crystal display module

The polarizer was fabricated in the same manner as in Preparation Example 3.

A composition for a high refractive index pattern layer was prepared by mixing 100 parts by weight of a UV curable resin (SSC155, Shin-A T&C) and 4 parts by weight of an anthrone-based light diffusing agent (particle size: 4 μm, Momentive, Tospearl 145), then dispersed.

The prepared composition was applied to a transparent PET film for a second protective layer (SRF, thickness: 80 μm, Re=14,000 nm at a wavelength of 550 nm, Toyobo Co., Ltd.) The surface is formed to form a coating. An engraved lenticular lens pattern and a flat portion are formed on the coating layer using a film having an embossed lenticular lens pattern (pitch: 10 μm, height: 10 μm) and a flat portion (pitch: 10 μm) alternately formed thereon, followed by curing, Thereby, a high refractive index pattern layer is formed. Next, a UV curable resin (SSC145, Shin-A T&C) is applied onto the high refractive index pattern layer so that the engraved lenticular lens pattern can be filled with the UV curable resin, followed by curing, thereby forming a direct formation on the high refractive index pattern layer. An optical film of a low refractive index pattern layer.

A polarizing plate adhesive (Z-200, Nippon Synthetic Chemical Co., Ltd.) is applied onto one surface of the low refractive index pattern layer, and the low refractive index pattern layer is bonded to the manufactured polarizer, followed by curing, thereby manufacturing The second polarizing plate.

A liquid crystal display module was manufactured using the manufactured second polarizing plate in the same manner as in Example 1.

Example 9: Manufacturing of a liquid crystal display module

The liquid crystal display module was fabricated in the same manner as in Example 8, except that the light diffusing agent content changes as listed in Table 3.

Example 10: Manufacturing of a liquid crystal display module

The polarizer was fabricated in the same manner as in Preparation Example 3.

A composition for a low refractive index pattern layer was prepared by mixing 100 parts by weight of a UV curable resin (SSC140, Shin-A T&C) and 10 parts by weight of an anthrone-based light diffusing agent (particle size: 4 μm, Momentive, Tospearl 145), then dispersed.

A UV curable resin (SSC157, Shin-A T&C) was applied to a transparent PET film for a second protective layer (SRF, thickness: 80 μm, Re=14000 nm at a wavelength of 550 nm, Toyobo Co., One surface of Ltd.)) to form a coating. An engraved lenticular lens pattern and a flat portion are formed on the coating layer using a film having an embossed lenticular lens pattern (pitch: 10 μm, height: 8 μm) and a flat portion (pitch: 10 μm) alternately formed thereon, followed by curing, Thereby, a high refractive index pattern layer is formed. Next, the prepared composition is applied onto the high refractive index pattern layer such that the engraved lenticular lens pattern can be filled with the composition and then cured, thereby forming an optical film directly forming a low refractive index pattern layer on the high refractive index pattern layer. film.

A polarizing plate adhesive (Z-200, Nippon Synthetic Chemical Co., Ltd.) is applied onto one surface of the low refractive index pattern layer, and the low refractive index pattern layer is bonded to the manufactured polarizer, followed by curing, thereby manufacturing The second polarizing plate.

A liquid crystal display module was manufactured using the manufactured second polarizing plate in the same manner as in Example 5.

Comparative Example 1: Manufacturing of a liquid crystal display module

A second polarizer was fabricated by stretching a polyvinyl alcohol film to three times its original length at 60 ° C, and adsorbing iodine onto the stretched film, followed by an aqueous solution of boric acid at 40 ° C. The resulting film was stretched to 2.5 times the stretched length of the film.

The adhesive for the polarizing plate is applied to both surfaces of the second polarizer, and the second polarizer is assembled to the transparent PET film for the second protective layer (SRF, thickness: 80 μm, 550 nm wavelength) A polarizing plate was produced by using a TAC film (KC4DR-1, thickness: 40 μm, Konica Co., Ltd.) for a third protective film of Re=14,000 nm, Toyo Co., Ltd.).

The composite optical sheet produced in Preparation Example 2, the first polarizing plate manufactured in Preparation Example 3, the liquid crystal panel (PVA mode), and the manufactured polarizing plate were assembled in this order, thereby manufacturing a liquid crystal display module.

Comparative Example 2: Manufacturing of a liquid crystal display module

A second polarizer was fabricated by stretching a polyvinyl alcohol film to three times its original length at 60 ° C, and adsorbing iodine onto the stretched film, followed by an aqueous solution of boric acid at 40 ° C. The resulting film was stretched to 2.5 times the stretched length of the film.

The adhesive for the polarizing plate is applied to both surfaces of the second polarizer, and the second polarizer is assembled to the transparent PET film for the second protective layer (SRF, thickness: 80 μm, 550 nm wavelength) A polarizing plate was produced by using a TAC film (KC4DR-1, thickness: 40 μm, Konica Co., Ltd.) for a third protective film of Re=14,000 nm, Toyo Co., Ltd.).

The composite optical sheet produced in Preparation Example 1, the first polarizing plate manufactured in Preparation Example 3, the liquid crystal panel (PVA mode), and the manufactured polarizing plate were assembled in this order, thereby manufacturing a liquid crystal display module.

Schematic configurations of the liquid crystal display modules fabricated in the examples and comparative examples are shown in Table 2 and Table 3.

The liquid crystal display modules manufactured in the examples and comparative examples were evaluated with respect to the following attributes, and the evaluation results are shown in Table 2, Table 3, and FIG.

(1) Brightness: The LED light source, the light guide plate and the liquid crystal display module are assembled to manufacture a liquid crystal display, and one side of the liquid crystal display includes a side light type LED light source (the configuration is the same as that of the Samsung LED TV (UN32H5500)), and the difference is in the example. And the configuration of the liquid crystal display module manufactured in the comparative example. The front brightness was measured using an EZ contrast analyzer X88RC (EZXL-176R-F422A4, ELDIM Co., Ltd.). The relative luminance is calculated by {(luminance of the example and comparative example) / (brightness of the comparative example)} x 100.

(2) 1/2 viewing angle and 1/3 viewing angle: The liquid crystal display was manufactured in the same manner as in Evaluation 1, and the brightness was measured using an EZ contrast analyzer X88RC (EZXL-176R-F422A4, Eldim Co., Ltd.). . The 1/2 viewing angle and the 1/3 viewing angle mean that the luminance value becomes a viewing angle of 1/2 and 1/3 of the front luminance, respectively.

(3) Contrast: The liquid crystal display was manufactured in the same manner as in Evaluation 1, and the spherical coordinate system (Φ, θ) and contrast were measured using an EZ contrast analyzer X88RC (EZXL-176R-F422A4, Eldim Co., Ltd.).

(4) Brightness uniformity: A liquid crystal display is manufactured by assembling an LED light source, a light guide plate, a liquid crystal display module, and a screen unit having a long axis and a short axis. Referring to FIG. 13, in a liquid crystal display including a light source, a light guide plate, and a liquid crystal display module, brightness is measured at each of points A, B, and C, wherein the center point, the left end point, and the right end point of the display screen are respectively passed through B. , A and C indicate, and obtain the maximum brightness value (Brightness max) and the minimum brightness value (Brightness min). Brightness uniformity can be calculated by (Brightness min) / (Brightness max) x 100. When measuring the brightness, the brightness tester EZ Contrast Analyzer X88RC (EZXL-176R-F422A4, Eldim Co., Ltd.) was fixed to point B and then guided to face each of points A, B and C.

<Table 2>

<Table 3>

* Refractive index difference: refractive index of high refractive index pattern layer - refractive index of low refractive index pattern layer

As shown in Tables 2 and 3, the liquid crystal display module manufactured in the example has high front luminance, and can increase the side viewing angle by increasing the 1/2 viewing angle and the 1/3 viewing angle, and has high side contrast. In addition, the liquid crystal display module manufactured in the example can increase the brightness uniformity and does not need to be changed due to the change of the size of the liquid crystal display by minimizing the change in brightness uniformity caused by the screen size of the liquid crystal display (as shown in FIG. 14). Show), thereby improving processability and economic viability. Therefore, the liquid crystal display module provided by the present invention can increase side contrast, side viewing angle and brightness uniformity, and minimize brightness uniformity variation caused by the screen size of the liquid crystal display, thereby ensuring excellent workability and economic feasibility. Sex.

In contrast, the liquid crystal display module of Comparative Example 1 did not utilize the optical film of the example, and its side contrast was low and the relative brightness was low.

The liquid crystal display module of Comparative Example 2 did not utilize the optical film of the example, and although the relative brightness was high, the viewing angle and contrast which it exhibited were not significantly improved. Further, as shown in FIG. 14, the liquid crystal display exhibits a brightness uniformity which varies significantly depending on the screen size of the liquid crystal display, and thus is less processable and economically viable than the liquid crystal display module manufactured in the example.

It will be appreciated that various modifications, changes, variations and equivalents may be made without departing from the spirit and scope of the invention.

1‧‧‧LCD module
2‧‧‧LCD display
10‧‧‧Composite optical sheets
11‧‧‧ First pattern
12‧‧‧First optical sheet
13‧‧‧second pattern
14‧‧‧Second optical sheet
15‧‧‧First base film
16‧‧‧Second base film
20‧‧‧First polarizer
30‧‧‧LCD panel
40‧‧‧Light source
41‧‧‧Light source cover
50‧‧‧Reflecting foil
60‧‧‧Light guide
70‧‧‧Diffuse sheet
80‧‧‧LCD module
90‧‧‧ window film
100‧‧‧second polarizer
100'‧‧‧second polarizer
110‧‧‧Second polarizer
120‧‧‧Optical film
120'‧‧‧Optical film
121‧‧‧Low-refractive-index pattern layer
122‧‧‧High refractive index pattern layer
122'‧‧‧High refractive index pattern layer
123‧‧‧ second plane
124‧‧‧ first plane
125‧‧‧fill pattern
126‧‧‧flat part
127‧‧‧ carving pattern
130‧‧‧Second protective layer
140‧‧‧Optical film
141‧‧‧Low-refractive-index pattern layer
142‧‧‧High refractive index pattern layer
143‧‧‧fill pattern
144‧‧‧ Engraving pattern
150‧‧‧Optical film
151‧‧‧Low-refractive-index pattern layer
152‧‧‧High refractive index pattern layer
153‧‧‧ carving pattern
154‧‧‧flat part
155‧‧‧ Surface
156‧‧‧fill pattern
160‧‧‧Optical film
161‧‧‧Low-refractive-index pattern layer
170‧‧‧ third protective layer
200‧‧‧second polarizer
300‧‧‧second polarizer
400‧‧‧second polarizer
500‧‧‧second polarizer
600‧‧‧second polarizer
A‧‧‧Display left endpoint of the screen
B‧‧‧Show screen center point
C‧‧‧Display screen right endpoint
A ¹ , A ² ‧ ‧ aspect ratio
H1, H2, H3, H5‧‧‧ height
P3, P4, P5‧‧‧ spacing α, β, g‧‧‧ apex angle

1 is a schematic cross-sectional view of a liquid crystal display module in accordance with an embodiment of the present invention. 2 is a cross-sectional view of a second polarizing plate of the liquid crystal display module shown in FIG. 1. 3 is a partially exploded perspective view of the optical film of the liquid crystal display module shown in FIG. 2. 4 is a cross-sectional view of a second polarizing plate of a liquid crystal display module in accordance with another embodiment of the present invention. FIG. 5 is a cross-sectional view of a second polarizing plate of a liquid crystal display module according to another embodiment of the present invention. 6 is a cross-sectional view of a second polarizing plate of a liquid crystal display module in accordance with still another embodiment of the present invention. 7 is a cross-sectional view of a second polarizing plate of a liquid crystal display module in accordance with still another embodiment of the present invention. 8 is a cross-sectional view of a second polarizing plate of a liquid crystal display module in accordance with still another embodiment of the present invention. 9 is a cross-sectional view of a second polarizing plate of a liquid crystal display module in accordance with still another embodiment of the present invention. Figure 10 is a perspective view of a composite optical sheet of a liquid crystal display module in accordance with still another embodiment of the present invention. Figure 11 is a perspective view of a liquid crystal display in accordance with one embodiment of the present invention. Figure 12 is a conceptual diagram of the exit angle. Fig. 13 is a view showing a display screen at the time of luminance uniformity measurement. Figure 14 is a graph depicting brightness uniformity.

1‧‧‧LCD module

20‧‧‧First polarizer

30‧‧‧LCD panel

100‧‧‧second polarizer

Claims (16)

A liquid crystal display module comprising: a first polarizing plate, a second polarizing plate, and a liquid crystal panel disposed between the first polarizing plate and the second polarizing plate, wherein the second polarizing plate comprises a polarizer and An optical film formed on the polarizer, the optical film comprising a high refractive index pattern layer and a low refractive index pattern layer, the high refractive index pattern layer having at least one engraving pattern, the low refractive index pattern layer having a filling a filling pattern of at least a portion of the engraved pattern, the high refractive index pattern layer having a higher refractive index than the low refractive index pattern layer; and the optical film being disposed such that light emitted from the liquid crystal panel enters the A low refractive index pattern layer is then emitted through the high refractive index pattern layer, and the optical film is disposed such that polarized light received from the polarizer is diffused through the optical film. The liquid crystal display module of claim 1, wherein the liquid crystal panel is a panel that is patterned in a vertical alignment mode. The liquid crystal display module of claim 1, wherein the engraved pattern has an aspect ratio of 1.0 or less. The liquid crystal display module of claim 1, wherein the engraving pattern comprises a lenticular lens pattern, a 稜鏡 pattern having a triangular to decagonal cross section, or a triangular to decagon cross section and The 稜鏡 pattern of the curved surface at the top of the engraving pattern. The liquid crystal display module of claim 1, wherein the high refractive index pattern layer has a ratio of a maximum pitch to a period of the engraved pattern of 0.5 or less. The liquid crystal display module of claim 1, wherein the high refractive index pattern layer further comprises a flat portion between the engraved patterns. The liquid crystal display module of claim 1, wherein the low refractive index pattern layer has a refractive index of less than 1.50. The liquid crystal display module of claim 1, wherein the high refractive index pattern layer has a refractive index of 1.50 or more. The liquid crystal display module of claim 1, wherein the filling pattern fills the engraving pattern. The liquid crystal display module of claim 1, wherein the second polarizing plate further comprises a second protective layer, and the polarizer, the low refractive index pattern layer, and the high refractive index pattern layer The second protective layer and the functional layer are sequentially formed in this order. The liquid crystal display module of claim 1, wherein the second polarizing plate further comprises a second protective layer, and the polarizer, the second protective layer, the low refractive index pattern layer, and The high refractive index pattern layer is sequentially formed in this order, the low refractive index pattern layer contacting the second protective layer, and the high refractive index pattern layer is directly formed on the low refractive index pattern layer. The liquid crystal display module of claim 10 or 11, wherein the second protective layer is made of polyethylene terephthalate, triethylene terephthalate, acrylic acid and cycloolefin polymer resin. At least one resin is formed. The liquid crystal display module of claim 1, further comprising: a composite optical sheet, wherein the composite optical sheet emits light at an exit angle of -40° to +40°. The liquid crystal display module of claim 1, wherein at least one of the high refractive index pattern layer and the low refractive index pattern further comprises a light diffusing agent. The liquid crystal display module of claim 14, wherein the light diffusing agent is in the high refractive index pattern layer, the low refractive index pattern or the high refractive index pattern layer, and the low refractive index The rate pattern layer is present in a total amount of from 0.1% by weight to 20% by weight. A liquid crystal display comprising the liquid crystal display module according to claim 1 of the patent application.