KR20210047185A - Liquid crystal display device and multi-panel display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device capable of implementing a narrow bezel by minimizing the area of the bezel area. According to one embodiment of the present invention, the liquid crystal display device comprises: a light source; a glass light diffusion plate disposed on the light source to diffuse light emitted from the light source; a polarizing plate disposed on the glass light diffusion plate; a display panel disposed on the polarizing plate and including a display area and a bezel area surrounding the display area; and an adhesive layer disposed between the glass light diffusion plate and the polarizing plate to correspond to the bezel area, wherein the polarizing plate includes an optical pattern formed to correspond to the bezel area and changes a direction of the light.

Description

Liquid crystal display device and multi-panel display device {LIQUID CRYSTAL DISPLAY DEVICE AND MULTI-PANEL DISPLAY DEVICE}

The present specification relates to a liquid crystal display device, and more particularly, to a liquid crystal device having a narrow bezel with a minimized dark portion occurring in a display area adjacent to a bezel area.

A liquid crystal display (LCD) is a display device that implements an image by controlling the arrangement of liquid crystals by placing a light source under the liquid crystal and applying an electric field to the liquid crystal to control the transmittance of light generated from the light source. , Smart phone, tablet PC, etc. It is applied to a variety of electronic equipment. The liquid crystal display device includes a liquid crystal display panel disposed on a backlight unit including a light source.

On the other hand, in recent years, in order to make the design of the liquid crystal display more beautiful and to reduce the size of the liquid crystal display, researches have been actively conducted to reduce the bezel area of the liquid crystal display.

In addition, since there is a limit to realizing an extra-large screen as one panel, a multi-panel display device in which a display area is increased by connecting a plurality of display panels has recently been used. For example, a super large screen may be implemented by arranging a plurality of display panels in the form of a type of tile. However, when a plurality of display panels are connected, there may be a problem in that bezel regions between adjacent display panels are visually recognized by a user.

In addition, when the bezel area is significantly reduced, a part of the light coming from the lower backlight unit is covered by an adhesive layer for bonding the display panel to the components under the display panel. In this case, a dark portion is generated at the edge of the display panel, that is, in the display area adjacent to the bezel area, and thus, there is a problem that luminance imbalance of the liquid crystal display device occurs.

Accordingly, a problem to be solved by the present invention is to provide a liquid crystal display device capable of implementing a narrow bezel by minimizing the area of the bezel area.

Another problem to be solved by the present invention is to provide a multi-panel liquid crystal display device in which an area of a non-display area is minimized so that a bezel area between display panels is not visually recognized by a user.

Another problem to be solved by the present invention is to solve the problem of visual recognition and improve luminance uniformity by generating dark areas in a display area adjacent to the bezel area when implementing a narrow bezel.

The problems of the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

A liquid crystal display according to an embodiment of the present invention includes a light source, a glass light diffusion plate disposed on the light source to diffuse light emitted from the light source, a polarizing plate disposed on the glass light diffusion plate, and disposed on the polarizing plate, and a display area And a display panel having a bezel area surrounding the display area, and an adhesive layer disposed between the glass light diffusion plate and the polarizing plate so as to correspond to the bezel area, and the polarizing plate is formed to correspond to the bezel area, and Includes the pattern.

Details of other embodiments are included in the detailed description and drawings.

The present invention can provide a liquid crystal display device in which a bezel area is minimized.

The present invention can solve a problem in which dark portions are generated at the corners of a display panel, and improve uniformity of luminance.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present invention.

1 is a schematic exploded perspective view illustrating a liquid crystal display device according to an exemplary embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of I-I' of FIG. 1.
3 is a schematic cross-sectional view of an enlarged area A of FIG. 2.
4 is a schematic cross-sectional view illustrating a liquid crystal display according to another exemplary embodiment of the present invention.
5A and 5B are graphs showing a result of measuring luminance according to a point inside a display area from an end of a liquid crystal display according to an exemplary embodiment of the present invention.
6A and 6B are graphs showing a result of measuring luminance according to a point inside a display area from an end of a liquid crystal display according to a comparative example not including an optical pattern.
7A is an image of an end of a display panel in a liquid crystal display according to an exemplary embodiment of the present invention. 7B is an image photographing an end of a display panel in a liquid crystal display according to a comparative example.
8 is a graph showing a condensing effect according to the shape of an optical pattern.
9 is a graph showing a profile of a luminance value according to an angle change _{of a first base angle θ 1} of the optical pattern in an optical pattern having an asymmetrical prism structure of a liquid crystal display according to an exemplary embodiment of the present invention. .
10 is a schematic plan view illustrating a multi-panel liquid crystal display according to an exemplary embodiment.
11 is a schematic plan view of an enlarged area X of FIG. 10.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only the present embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for describing the embodiments of the present invention are exemplary, and thus the present invention is not limited to the illustrated matters. The same reference numerals refer to the same elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. When'include','have','consists of' and the like mentioned in the present invention are used, other parts may be added unless'only' is used. In the case of expressing the constituent elements in the singular, it includes the case of including the plural unless specifically stated otherwise.

In interpreting the constituent elements, it is interpreted as including an error range even if there is no explicit description.

In the case of a description of the positional relationship, for example, if the positional relationship of two parts is described as'upper','upper of','lower of','next to','right' Or, unless'direct' is used, one or more other parts may be located between the two parts.

When an element or layer is referred to as “on” another element or layer, it includes all cases in which another layer or another element is interposed directly on or in the middle of another element.

Also, the first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are only used to distinguish one component from another component. Accordingly, the first component mentioned below may be a second component within the technical idea of the present invention.

The same reference numerals refer to the same elements throughout the specification.

The size and thickness of each component shown in the drawings are illustrated for convenience of description, and the present invention is not necessarily limited to the size and thickness of the illustrated component.

Each of the features of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or can be implemented together in an association relationship. May be.

Hereinafter, the present invention will be described with reference to the drawings.

1 to 3 are diagrams for describing a liquid crystal display according to an exemplary embodiment of the present invention. Specifically, FIG. 1 is a schematic exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of I-I' of FIG. 1. 3 is a schematic cross-sectional view of an enlarged area A of FIG. 2.

1 to 3, a liquid crystal display device 100 according to an exemplary embodiment includes a bottom cover 110, a backlight unit, and a liquid crystal display panel 170.

The bottom cover 110 is a case member that accommodates and protects components of a backlight unit and a component of a liquid crystal display.

The bottom cover 110 may be formed in a rectangular frame shape with an edge vertically bent. The bottom cover 110 includes a horizontal portion 112 and a vertical portion 114. The horizontal part 112 faces the rear surface of the light source 120 and is disposed to surround the rear surface of the light source 120. The vertical portion 114 extends from the horizontal portion 112 and is disposed to face the side surface of the light source 120 and surround the side surface of the light source 120. The vertical portion 114 extends from one end of the horizontal portion 112 in the front direction. That is, the vertical portion 114 has a shape protruding from the horizontal portion 112 in the front direction. The light source 120 and the reflective sheet REF are accommodated in the inner space provided by the horizontal portion 112 and the vertical portion 114.

The vertical portion 114 of the bottom cover 110 maintains a constant interval between the light source 120 and the glass light diffusion plate 150. That is, the height of the vertical portion 114 may be appropriately selected in consideration of an optical gap between the light source 120 and the glass light diffusion plate 150.

Meanwhile, the vertical portion 114 of the bottom cover 110 may have a shape that is inclined from the horizontal portion 112 of the bottom cover 110 and protrudes in the front direction.

The bottom cover 110 may include a material having high thermal conductivity and high rigidity so that heat from the driving circuit and the light source 120 can be smoothly discharged to the outside. For example, the bottom cover 110 is aluminum, aluminum nitride (AlN), electro-galvanized steel sheet (EGI), stainless steel (SUS), galvalume (SGLC), aluminum-plated steel sheet (aka ALCOSTA), tin-plated steel sheet (SPTE) It may be made of a metal plate such as, but is not limited thereto.

A plurality of light sources 120 are disposed inside the bottom cover 110. The light source 120 may be implemented as a light emitting diode (“LED”) having advantages such as high efficiency, high brightness, and low power consumption, but is not limited thereto. A plurality of light sources 120 may be disposed on the horizontal portion 112 of the bottom cover 110, and their positions and density may be appropriately selected in consideration of optical characteristics. In addition, the light source 120 is turned on and off by receiving an electrical signal from the light source driver through the light source PCB. A circuit for electrically connecting the light source 120 and the light source driver is formed on the light source PCB. The light source PCB may be formed of a metal light source PCB, and in this case, it may be made of aluminum to favor heat dissipation.

The reflector 130 is disposed on the light source 120. The reflector 130 may expose the light source 120 through a through hole penetrating the reflector 130, but is not limited thereto. The efficiency of light incident on the liquid crystal display panel 170 may be improved through the reflector 130. The reflector 130 may be bent and extend along the vertical portion 114 of the bottom cover 110.

A glass light diffusion plate 150 is disposed on the bottom cover 110. The glass light diffusion plate 150 may include a glass substrate 154, a first optical control layer 152 and a second optical control layer 156 disposed below and above the glass substrate 154.

The glass substrate 154 is made of a transparent glass material, and serves as a base substrate. The glass substrate 154 may include transparent beads capable of diffusing light in order to further improve optical properties.

As for the first optical control layer 152 and the second optical control layer 156, respectively, a light diffusion layer or a light condensing layer may be used as necessary. For example, the light diffusion layer diffuses light by refracting and scattering incident light. The diffusion layer may be formed by dispersing a light diffusion component such as beads or fibers in a binder resin. The binder resin is highly transparent, has excellent light transmittance, and is easy to control viscosity.For example, polyethylene terephthalate (PET), polyethylene naphthalate, acrylic resin (polymethyl methacrylate) : PMMA), polycarbonate, polystyrene, polyolefine, cellulose acetate, polyvinyl chloride, etc., but is not limited thereto. In addition, the diffusion layer may include a fine pattern in addition to light diffusion components such as beads or fibers to adjust the scattering angle of light, thereby diffusing the light and processing it into uniform light. Meanwhile, the light condensing layer refracts light using a fine pattern. The fine pattern may be configured in various ways, such as an elliptical pattern and a polygon pattern, but is not limited thereto.

Since the glass light diffusion plate 150 is made of a glass material having excellent thermal properties, not a light diffusion plate made of a plastic-based material, expansion, contraction, and displacement of the light diffusion plate according to external environmental factors can be minimized. Accordingly, according to the embodiment of the present invention, it is possible to minimize changes in the position and shape of the light diffusion plate according to temperature changes, and thus prevent the decrease in optical properties due to changes in the position and shape of the light diffusion plate. In addition, interference with other structures due to a change in the position of the light diffusion plate can be minimized.

The glass light diffusion plate 150 is supported by the vertical portion 114 of the bottom cover 110. The glass light diffusing plate 150 has excellent rigidity unlike the light diffusing plate made of a plastic material, and thus can be disposed on the vertical portion 114 of the bottom cover 110 without sagging.

Meanwhile, in the liquid crystal display device 100 illustrated in FIG. 1, the glass light diffusion plate 150 is disclosed, but the present invention is not limited thereto. That is, instead of the glass light diffusion plate 150, a light diffusion plate formed of a plastic material may be used, and the light diffusion plate is not disposed on the vertical portion 114 of the bottom cover 110, but inside the bottom cover 110 It may be arranged to be seated in

The first adhesive layer 140 is disposed between the vertical portion 114 of the bottom cover 110 and the glass light diffusion plate 150. The first adhesive layer 140 fixes the bottom cover 110 and the glass light diffusion plate 150. The first adhesive layer 140 may perform a function of limiting mutual movement of the glass light diffusion plate 150 and the bottom cover 110 and buffering an impact from the outside. In addition, the first adhesive layer 140 may further include a light blocking material to prevent light from leaking to the outside of the liquid crystal display. The first adhesive layer 140 may be a double-sided tape, but is not limited thereto.

The display panel 170 is disposed on the glass light diffusion plate 150. The display panel 170 is a panel that displays various types of images. The display panel 170 has a display area (DA) and a bezel area (BA) that is a non-display area. The display area DA is an area in which a display device is disposed and an actual image is displayed. The bezel area BA is an outer area surrounding the display area DA, and is an area in which an image is not substantially displayed by being covered with a light blocking member. Various driving elements for driving the display elements may be disposed in the bezel area BA.

The display panel 170 includes a lower substrate 172, an upper substrate 174, a lower polarizing plate 176, and an upper polarizing plate 178. In the liquid crystal display according to the exemplary embodiment of the present invention, since the display panel 170 is a liquid crystal display panel, a liquid crystal layer including liquid crystal molecules disposed between the lower substrate 172 and the upper substrate 174 facing each other is formed. Includes.

The lower substrate 172 is a substrate for supporting various components constituting the display panel 170, and on the lower substrate 172, a thin film transistor (TFT), a pixel electrode electrically connected to the thin film transistor, and a pixel A common electrode capable of forming an electric field with the electrode is disposed. Accordingly, the lower substrate 172 may be referred to as a thin film transistor substrate. The thin film transistor forms an electric field between a pixel electrode and a common electrode based on a driving signal transmitted through a wiring.

The upper substrate 174 faces the lower substrate 172. The upper substrate 174 is a substrate for supporting the color filter layer, and may be referred to as a color filter substrate. The color filter layer selectively transmits light of a specific wavelength. A full color image is displayed through the color filter layer.

Polarizing plates that transmit only linearly polarized light in a specific direction may be attached to outer surfaces of the lower substrate 172 and the upper substrate 174, respectively. Specifically, the lower polarizing plate 176 is disposed on the lower surface of the lower substrate 172 and the upper polarizing plate 178 is disposed on the upper surface of the upper substrate 174. The lower polarizing plate 176 and the upper polarizing plate 178 may have an area larger than that of the display area DA and may have an area smaller than that of the display panel 170.

The lower polarizing plate 176 and the upper polarizing plate 178 may be formed by stretching poly-vinyl alcohol (PVA) dyed with iodine (I). The lower polarizing plate 176 and the upper polarizing plate 178 have absorption axes formed in the stretching direction to absorb light vibrating in a direction parallel to the absorption axis, and selectively transmit only light vibrating in a direction perpendicular to the absorption axis.

In the liquid crystal display, the light transmission axis of the lower polarizing plate 176 may be disposed perpendicular to the light transmission axis of the upper polarizing plate 178.

Referring to FIG. 3 in which area A of FIG. 2 is enlarged, a plurality of optical patterns P are formed at the corners of the lower polarizing plate 176 corresponding to the bezel area BA. The plurality of optical patterns P may be formed at the corners of the lower polarizing plate 176 along the bezel area BA. The plurality of optical patterns P function to convert the light L1 emitted from the light source 120 and incident on the bezel area BA to the display area DA.

Specifically, in order to implement a narrow bezel, a display device may be manufactured in which the length of the bezel area BA is 1 mm or less or 0.5 mm or less. When the length of the bezel area BA is extremely narrow to 1 mm or less, the second adhesive layer 160 bonding the display panel 170 and the glass light diffusion plate 150 to the display area DA in the bezel area BA As a result, it is invaded by a predetermined distance d2. When the bezel area BA becomes extremely narrow, if the second adhesive layer 160 is formed in response to only the bezel area BA, it may be difficult to secure sufficient adhesive strength between the display panel 170 and the glass light diffusion plate 150. . However, when the second adhesive layer 160 extends to the display area DA, the second adhesive layer 160 invading the display area DA covers a part of the light emitted from the light source 120. As a result, a dark portion occurs at a corner portion of the display area DA, that is, a boundary portion between the display area DA and the bezel area BA, resulting in a problem in that luminance uniformity is deteriorated.

The plurality of optical patterns P use a condensing effect to more efficiently condense light of various angles entering the bezel area BA into the display area DA, so that the display area adjacent to the bezel area BA ( It is possible to minimize the problem that the dark part occurs in DA).

Each of the optical patterns P has a concave shape recessed from the lower surface of the lower polarizing plate 176 toward the upper side. That is, the optical pattern P is formed as an intaglio pattern. More specifically, the optical pattern P has a prism structure. That is, the optical pattern P may have a structure having a triangular cross-section extending in parallel in one direction.

At this time, the optical pattern P has a prism structure having an asymmetric shape in cross section. Referring to FIG. 3, the optical pattern P has a structure in which the upper edge of the prism structure is skewed toward the inside of the display area. _{That is, in the optical pattern P, the first base angle θ 1} adjacent to the inside of the liquid crystal display 100, that is, the display area DA is greater than _{the second base angle θ 2} adjacent to the outside of the display panel 170. It has a large shape.

In this case, the first base angle θ ₁ of the optical pattern P may exceed 45° and may be 55° or more. In particular, in order to maximize the light condensed into the display area DA, the first base angle θ ₁ of the optical pattern P is preferably 60° to 75°, but is not limited thereto. The sizes of the first base angle θ ₁ and the second base angle θ ₂ of the optical pattern P may vary according to _{the width W 1 or the height H of the optical pattern P.}

The height H of the optical pattern P is smaller than the height of the lower polarizing plate 176. When the height H of the optical pattern P is higher than the height of the lower polarizing plate 176, since the optical pattern P penetrates the upper surface of the lower polarizing plate 176 and extends to the lower substrate 172, the lower polarizing plate 176 ) And the lower substrate 172, the light cannot be efficiently condensed due to the difference in refractive index.

Meanwhile, the height H of the optical pattern P may be 30 um to 55 um, and may be 35 um to 50 um. When the first base angle θ ₁ of the optical pattern P is 60° to 75° and the height H of the optical pattern P satisfies the above range, the display area DA from the bezel area BA The condensing effect can be maximized by the corner.

_{The width W 1} of the optical pattern P may be 30 μm to 60 μm, and may be 40 μm to 50 μm. When the first base angle θ ₁ of the optical pattern P is 60° to 75° and the width W ₁ of the optical pattern P satisfies the above range, the display area DA from the bezel area BA The condensing effect can be maximized by the corner of the.

_{The interval W 2} between the plurality of optical patterns P may be 30 μm to 60 μm, and may be 40 μm to 50 μm, but is not limited thereto.

Meanwhile, the optical pattern P is spaced apart by a predetermined distance d1 from the boundary between the display area DA and the bezel area BA. When the optical pattern P is positioned excessively close to the boundary between the display area DA and the bezel area BA, the amount of light condensed by the optical pattern P inside the edge of the display panel 170 where the dark part is generated. As this increases, a luminance line may occur or a luminance uniformity may decrease. Accordingly, it is preferable that the optical pattern P formed on the lower polarizing plate 176 corresponding to the bezel area BA is spaced apart by a predetermined distance from the boundary between the display area DA and the bezel area BA. For example, the distance d1 between the optical pattern P from the boundary between the display area DA and the bezel area BA is preferably 50 μm or more. When the distance d1 between the optical pattern P from the boundary between the display area DA and the bezel area BA is less than 50 μm, a bright line may be recognized.

The plurality of optical patterns P are formed so as not to overlap with the light source 120. Considering that the plurality of optical patterns P are formed at positions corresponding to the bezel area BA, the plurality of optical patterns P do not overlap the light source 120 disposed to correspond to the display area. If the plurality of optical patterns P are arranged to overlap the light source 120, the amount of light may be changed, and thus the luminance uniformity of the liquid crystal display may be lowered.

A second adhesive layer 160 is disposed between the glass light diffusion plate 150 and the display panel 170. The second adhesive layer 160 fixes the glass light diffusion plate 150 and the display panel 170. The second adhesive layer 160 may perform a function of limiting mutual movement of the glass light diffusion plate 150 and the display panel 170 and buffering an impact from the outside. The first adhesive layer 140 may use a liquid adhesive material that can be applied. For example, the first adhesive layer 140 may be resin, but is not limited thereto.

A side sealing part 180 is positioned on the side of the display panel 170. The side sealing part 180 surrounds at least one side surface of the display panel 170, protects the display panel 170 from external impact, and prevents moisture from penetrating into the display panel 170. The side sealing part 180 may be formed on all sides of the display panel 170, but is not limited thereto. The side sealing part 180 may include an acrylic material, a urethane material, a silicone material, or a mixture thereof.

The liquid crystal display device 100 according to an exemplary embodiment of the present invention implements a narrow bezel with a length of the bezel area BA of 1 mm or less or 0.5 mm or less. However, when the size of the bezel area BA becomes very narrow, a space in which an adhesive layer is disposed for bonding the display panel 170 and a component disposed under the display panel 170 is insufficient. In this case, the adhesive layer under the display panel 170 invades from the bezel area BA to the display area DA. Since the adhesive layer extending to the display area DA blocks light emitted from the lower backlight unit, there is a problem that a dark portion occurs between the bezel area BA and the display area DA.

In the liquid crystal display 100 according to an exemplary embodiment of the present invention, an optical pattern P is formed on the lower polarizing plate 176 disposed on the lower surface of the display panel 170 to correspond to the bezel area. The optical pattern P having a triangular prism shape in cross section may convert light from the light source 120 to the bezel area to a display area adjacent to the bezel area in which the dark part is formed. Through the optical pattern formed on the lower polarizing plate 176, the occurrence of dark portions can be minimized and luminance uniformity can be improved.

4 is a schematic cross-sectional view illustrating a liquid crystal display according to another exemplary embodiment of the present invention.

The liquid crystal display 200 shown in FIG. 4 is substantially the same as the liquid crystal display 100 shown in FIG. 1 except that the lower polarizing plate 276 is formed of a triple layer. Description is omitted.

4, the lower polarizing plate 276 includes a base layer 276a, a first polarizing layer 276b under the base layer 276a, and a second polarizing layer 276c over the base layer 276a. It has a three-layer structure.

The base layer 276a is a layer that supports the polarizing layer on both sides, and is made of tri-acetyl cellulose (TAC), polycarbonate (PC), polyethylene terephthalate (PET), and a cyclone. It can be formed as a base material of one of the cyclo olefin polymers (COP). TAC may be mainly used as the base layer in terms of heat resistance and durability, but is not limited thereto.

The first polarizing layer 276b and the second polarizing layer 276c are formed by stretching poly-vinyl alcohol (PVA) dyed with iodine (I).

Referring to FIG. 4, the lower polarizing plate 276 includes a plurality of optical patterns P formed on the first polarizing layer 276b under the base layer 276a. In the liquid crystal display device 200 according to another embodiment of the present invention, the optical pattern P for changing the direction of light is formed only on the first polarizing layer 276b, and the base layer 276a or the second polarizing layer 276c It is not formed to extend to ). That is, the height of the optical pattern P is smaller than the height of the first polarizing layer 276b of the lower polarizing plate 276. When the height of the optical pattern P is higher than the height of the first polarizing layer 276b, since the optical pattern P penetrates the top surface of the first polarizing layer 276b and extends to the base layer 276a, the first polarization Due to the difference in refractive index between the layer 276b and the base layer 276a, it may be difficult to expect an efficient light collecting effect.

5A and 5B are graphs illustrating a result of measuring luminance according to a point inside a display area from an end of a liquid crystal display according to an exemplary embodiment of the present invention. 5A is a graph showing a result of measuring luminance while moving 27 mm from the long side end of the liquid crystal display toward the inside of the display area. 5B is a graph showing a result of measuring luminance while moving 27 mm from an end of a short side of a liquid crystal display toward a display area.

6A and 6B are graphs showing a result of measuring luminance according to a point inside a display area from an end of the liquid crystal display according to Comparative Example 1 not including an optical pattern. 6A is a graph showing a result of measuring luminance while moving 27 mm from the long side end of the liquid crystal display toward the display area. 6B is a graph showing a result of measuring luminance while moving 27 mm from an end of a short side of a liquid crystal display toward a display area.

Comparing FIGS. 5A and 5B with FIGS. 6A and 6B, it can be seen that in the case of the liquid crystal display according to an exemplary embodiment of the present invention, a phenomenon in which the luminance rapidly decreases in the outer portion of the panel is suppressed. Specifically, looking at Figs. 6a and 6b according to Comparative Example 1, the relative luminance values at the ends of the long side and the short side are 25.2% and 36.2%, respectively, but looking at Figs. 5a and 5b according to an embodiment of the present invention, the long side And the relative luminance values at the ends of the short sides are 45.6% and 59.7%, respectively. That is, through the optical pattern formed on the lower polarizing plate corresponding to the bezel region, it was confirmed that the luminance at the end was improved by 20% or more.

7A is an image of an end of a display panel in a liquid crystal display according to an exemplary embodiment of the present invention. 7B is an image photographing an end of a display panel in a liquid crystal display according to Comparative Example 1; Referring to FIG. 7B, a dark portion DP in which the boundary portion between the display area and the bezel area of the liquid crystal display according to Comparative Example 1 is darkened can be seen. However, referring to FIG. 7A, it can be seen that the luminance of the boundary portion between the display area and the bezel area does not significantly decrease in the liquid crystal display according to the present invention including the optical pattern.

8 is a graph showing a condensing effect according to the shape of an optical pattern.

Example 1 disclosed in FIG. 8 is a prism structure having an asymmetrical shape in cross section in the shape of an optical pattern of a liquid crystal display according to an embodiment of the present invention. Looking at the omnidirectional viewing angle luminance of the optical pattern having the structure of Example 1, it can be seen that the luminance is high around a specific angle, and the luminance distribution is asymmetric. From this, it can be confirmed that light can be condensed in a specific direction.

Comparative Example 2 describes a rental structure in the shape of an optical pattern. Looking at the omni-directional viewing angle luminance of the optical pattern having the structure of Comparative Example 2, it was confirmed that the luminance was evenly distributed across the viewing angle. From this, it can be seen that Comparative Example 2 has no condensing effect.

Comparative Example 3 describes a rectangular parallelepiped structure in the shape of an optical pattern. Looking at the omnidirectional viewing angle luminance of the optical pattern having the structure of Comparative Example 3, the luminance value is high around a specific viewing angle, so there is a condensing effect. .

Comparative Example 4 describes a trapezoidal structure in the shape of an optical pattern. Looking at the omni-directional viewing angle luminance of the optical pattern having the structure of Comparative Example 4, it can be seen that the condensing effect is large, but since it has a luminance value that is completely symmetric, it is difficult to perform the function of transmitting light at a specific angle Is judged.

Accordingly, referring to FIG. 8, it can be seen that by forming an optical pattern through an asymmetric prism structure, the formation of dark portions can be minimized by changing the optical path from the bezel area to the display area.

9 is a graph showing a profile of a luminance value according to an angle change _{of a first base angle θ 1} of the optical pattern in an optical pattern having an asymmetrical prism structure of a liquid crystal display according to an exemplary embodiment of the present invention. .

Referring to FIG. 9, when the height (H) and width (W ₁ ) of the optical pattern are 40 μm, respectively, when _{the angle of the first base angle (θ 1} ) is 60° or 75°, the luminance value in a specific direction is large. It was confirmed that it was improved. That is, when the _{angle of the first base angle θ 1} is designed to be about 60° to 75°, the house, effect, and light path can be easily set.

10 is a schematic plan view illustrating a multi-panel liquid crystal display according to an exemplary embodiment. 11 is a schematic plan view of an enlarged area X of FIG. 10.

Referring to FIGS. 10 and 11, a multi-panel display device 1000 according to an exemplary embodiment includes a plurality of liquid crystal displays. A plurality of liquid crystal displays may be arranged in the form of an m x n tile, and may be implemented as a single multi-panel display device 1000. In FIG. 10, for convenience of explanation, it is described that 20 liquid crystal displays are arranged in a 5 x 4 tile shape, but the present invention is not limited thereto, and an appropriate number of display devices may be arranged as necessary.

Referring to FIG. 11 showing region X of FIG. 10, a plurality of liquid crystal display devices 100A, 100B, 100D, and 100D may be disposed in vertical or horizontal contact. For example, the plurality of liquid crystal displays includes a first liquid crystal display device 100A, a second liquid crystal display device 100B, a third liquid crystal display device 100C, and a fourth liquid crystal display device 100D. The first liquid crystal display device 100A and the second liquid crystal display device 100B are arranged to contact left and right, and the first liquid crystal display device 100A and the third liquid crystal display device 100C are arranged to make vertical contact.

The liquid crystal display device included in the multi-panel display device illustrated in FIG. 11 may be the liquid crystal display device illustrated in FIGS. 1 to 3. In this case, the liquid crystal display shown in FIGS. 1 to 3 has a narrow bezel with a width of the bezel area BA of 1 mm or less or 0.5 mm or less. Referring to FIG. 11, in the multi-panel display device 1000 according to an exemplary embodiment, the shim S is the sum of the lengths of the bezel areas BA of the display devices 100A and 100B adjacent to each other. . That is, the shim S is twice the size B of the bezel area of the display device 100A adjacent to each other. Since the multi-panel display device 1000 according to the exemplary embodiment of the present disclosure may implement a narrow bezel, the shims S of the liquid crystal displays 100A and 100B adjacent to each other may be minimized.

A liquid crystal display device according to various embodiments of the present disclosure may be described as follows.

A liquid crystal display according to an exemplary embodiment of the present invention includes a glass light diffusion plate disposed on a light source to diffuse light emitted from the light source, a polarizing plate disposed on the glass light diffusion plate, and disposed on the polarizing plate, and An optical pattern comprising a display panel having a bezel area surrounding the display area and an adhesive layer disposed between the glass light diffusion plate and the polarizing plate so as to correspond to the bezel area, and the polarizing plate is formed to correspond to the bezel area and changes the direction of light Includes.

According to another feature of the present invention, the optical pattern may have a concave prism structure from a lower surface to an upper surface of the polarizing plate.

According to another feature of the present invention, the optical patterns may be elongated along the length direction of the display panel and may be arranged in plural along the thickness direction of the display panel.

According to another feature of the present invention, the optical pattern may have a structure in which the upper edge of the prism structure is skewed toward the inside of the display area.

According to another feature of the present invention, the optical pattern may have a shape in which the first base angle θ adjacent to the display area is larger than the second base angle θ adjacent to the outside of the display panel.

According to another feature of the present invention, the first base angle θ of the optical pattern may be 60° to 75°.

According to another feature of the present invention, the height H of the optical pattern may be 30 μm to 55 μm, and the width W1 of the optical pattern may be 30 μm to 60 nm.

According to another feature of the present invention, the height of the optical pattern may be smaller than the height of the polarizing plate.

According to another feature of the present invention, the optical pattern may be disposed to be spaced apart by 50 μm or more from the boundary between the display area and the bezel area.

According to another feature of the present invention, the polarizing plate includes a base layer made of a polymer material, a first polarizing layer disposed under the base layer, and a second polarizing layer disposed over the base layer, and the optical pattern is a first polarizing layer. And the height H of the optical pattern may be smaller than the height of the first polarizing layer.

According to another feature of the present invention, the adhesive layer may extend from the bezel area to a part of the display area to partially overlap the display area.

According to another feature of the present invention, a bottom cover having a vertical portion supporting the edge of the glass light diffusion plate from the rear surface and a horizontal portion extending from the vertical portion facing the rear surface of the light source, and the vertical portion of the bottom cover and the glass light diffusion plate An adhesive member for adhering to may be further included, and the vertical portion of the bottom cover may be disposed to correspond to the bezel area.

According to another feature of the present invention, the width of the bezel area may be 1 mm or less.

A multi-panel display device according to an exemplary embodiment of the present invention includes a plurality of liquid crystal displays disposed adjacent to each other, and each of the plurality of liquid crystal displays is disposed on a light source and a light source to diffuse light emitted from the light source. To correspond to the bezel area between the glass light diffusing plate, the polarizing plate disposed on the glass light diffusing plate, the display panel disposed on the polarizing plate and having a display area and a bezel area surrounding the display area, and between the glass light diffusing plate and the polarizing plate. It includes an adhesive layer disposed, and the polarizing plate is formed to correspond to the bezel area, and includes an optical pattern for changing a direction of light.

According to another feature of the present invention, the optical pattern may have a concave prism structure from a lower surface of the polarizing plate toward an upper portion, extend long along a length direction of the display panel, and may be arranged in plural along the thickness direction of the display panel.

According to another feature of the present invention, the optical pattern may have a structure in which the upper edge of the prism structure is skewed toward the inside of the display area.

According to another feature of the present invention, the adhesive layer may extend from the bezel area to a part of the display area to partially overlap the display area.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made without departing from the spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and are not restrictive. The scope of protection of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100, 200: liquid crystal display
110: bottom cover
120: light source
130: reflector
140: first adhesive layer
150: glass light diffusion plate
160: second adhesive layer
170: display panel
172: lower substrate
174: upper substrate
176, 276: lower polarizer
178: upper polarizer
180: side sealing part

Claims (17)

Light source;
A glass light diffusion plate disposed on the light source to diffuse light emitted from the light source;
A polarizing plate disposed on the glass light diffusing plate;
A display panel disposed on the polarizing plate and including a display area and a bezel area surrounding the display area; And
Including an adhesive layer disposed between the glass light diffusion plate and the polarizing plate to correspond to the bezel region,
The polarizing plate is formed to correspond to the bezel area and includes an optical pattern for changing a direction of light. The method of claim 1,
The optical pattern has a prism structure concave from a lower surface to an upper surface of the polarizing plate. The method of claim 2,
A liquid crystal display device, wherein the optical patterns are elongated along a length direction of the display panel and are arranged in plural along a thickness direction of the display panel. The method of claim 2,
The optical pattern has a structure in which the upper edge of the prism structure is skewed toward the inside of the display area. The method of claim 4,
The optical pattern has a shape in which a first base angle θ adjacent to the display area is greater than a second base angle θ adjacent to the outside of the display panel. The method of claim 5,
The first base angle (θ ₁ ) of the optical pattern is 60° to 75°. The method of claim 6,
The height H of the optical pattern is 30um to 55um, and the width W1 of the optical pattern is 30um to 60nm. The method of claim 1,
The height of the optical pattern is smaller than the height of the polarizing plate, liquid crystal display The method of claim 1,
The optical pattern is disposed to be spaced apart by 50 μm or more from a boundary between the display area and the bezel area. The method of claim 1,
The polarizing plate includes a base layer made of a polymer material, a first polarizing layer disposed below the base layer, and a second polarizing layer disposed above the base layer,
The optical pattern is formed on the first polarizing layer, and the height H of the optical pattern is smaller than the height of the first polarizing layer. The method of claim 1,
The adhesive layer extends from the bezel area to a part of the display area to partially overlap the display area. The method of claim 1,
A bottom cover having a vertical portion supporting an edge of the glass light diffusion plate from a rear surface and a horizontal portion extending from the vertical portion and facing the rear surface of the light source; And
Further comprising an adhesive member for bonding the vertical portion of the bottom cover and the glass light diffusion plate,
The vertical portion of the bottom cover is disposed to correspond to the bezel area. The method of claim 1,
The liquid crystal display device, wherein the width of the bezel area is 1 mm or less. Including a plurality of liquid crystal display devices arranged to be adjacent to each other,
Each of the plurality of liquid crystal displays:
Light source;
A glass light diffusion plate disposed on the light source to diffuse light emitted from the light source;
A polarizing plate disposed on the glass light diffusing plate;
A display panel disposed on the polarizing plate and including a display area and a bezel area surrounding the display area; And
Including an adhesive layer disposed between the glass light diffusion plate and the polarizing plate to correspond to the bezel region,
The polarizing plate is formed to correspond to the bezel area and includes an optical pattern for changing a direction of light. The method of claim 14,
The multi-panel display device, wherein the optical pattern has a concave prism structure from a lower surface to an upper portion of the polarizing plate, extends long along a length direction of the display panel, and is arranged in plural along a thickness direction of the display panel. The method of claim 14,
The optical pattern has a structure in which the upper edge of the prism structure is skewed toward the inside of the display area. The method of claim 14,
The adhesive layer extends from the bezel area to a part of the display area to partially overlap the display area.

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