KR20110042478A - Backlight module and liquid crystal display with the same - Google Patents

Abstract

PURPOSE: A backlight module of a liquid crystal display device is provided to efficiently fix optical sheets for preventing bending phenomenon. CONSTITUTION: A backlight module comprises a light source part(140) including one or more light sources(154), an optical sheet(160) supplying light from the light source to a liquid crystal panel(120), and a first and a second region which are corresponding to the display and the non-display region of the liquid crystal display panel. The optical sheet is placed at the rear part of the liquid crystal panel. An optical adhesive layer is partly located at the first region.

Description

BACKLIGHT MODULE AND LIQUID CRYSTAL DISPLAY WITH THE SAME}

The present invention relates to a backlight module for supplying light to a non-light emitting display device such as a liquid crystal display device and a liquid crystal display device having the module.

A non-light emitting display device such as a liquid crystal display device includes a liquid crystal panel and a backlight module. The liquid crystal panel includes a liquid crystal layer, a thin film transistor (TFT) substrate and a color filter substrate facing each other with the liquid crystal layer interposed therebetween, and displays an image using light provided from the backlight module.

The backlight module for supplying light includes at least one light source and a functional optical sheet for supplying light emitted from the light source to the liquid crystal panel.

Functional optical sheets include brightness enhancement sheets, prism sheets, and diffusion sheets, such as Dual Brightness Enhancement Film (DBEF) or Brightness Enhancement Film (BEF).

The aforementioned functional optical sheets are mainly fixed to each other by a fixing structure by double-sided tape, a fixing structure by a mechanical structure such as a boss, or a fixing structure by an adhesive layer. The liquid crystal panel or the diffusion plate (or the light guide plate) is also fixed by the fixing structure.

Here, the fixing structure by the double-sided tape forms a tab on a part of the optical sheet, positions the double-sided tape on the tab, fixes the two optical sheets using the double-sided tape, and uses the tab of the optical sheet as a light source. And a structure fixed to a recess of a support member for supporting a diffusion plate or the like.

And the fixing structure by a boss means the structure which fixes an optical sheet by forming a hole in the tab of an optical sheet, forming a boss in the said support member, and couple | bonding the said hole to a boss.

And the fixing structure by an adhesive layer means the structure which apply | coats an adhesive agent over the whole one surface of an optical sheet, and adhere | attaches another optical sheet using the apply | coated adhesive agent, and fixes two optical sheets.

However, since the fixing structure by the double-sided tape has to form a tab for adhering the double-sided tape, there is a problem in that the size of the bezel is limited.

In addition, the fixing structure by the boss has a problem that a tolerance occurs in the hole as time passes, and the optical sheets are flowed, thereby causing a gap between sheets.

In addition, the fixing structure by the adhesive layer has a problem in that warpage occurs due to problems such as differences in coefficients of thermal expansion between sheets.

As such, the conventional fixing structures do not effectively fix the optical sheets.

The technical problem to be achieved by the present invention is to provide a backlight module in which the optical sheets are effectively fixed.

Another object of the present invention is to provide a liquid crystal display device having the above-described backlight module.

In one embodiment, a backlight module includes: a light source unit including at least one light source; And an optical sheet positioned at a rear surface of the liquid crystal panel and supplying light of the light source to the liquid crystal panel, wherein the optical sheet includes first and second regions respectively corresponding to the display area and the non-display area of the liquid crystal panel. And a light transmissive adhesive layer partially positioned in the first region.

In an embodiment of the present invention, the light source unit includes a first layer for mounting the light source; And a second layer positioned over the first layer and covering the light source. The light source unit may further include a reflective layer formed between the first layer and the second layer.

The adhesive layer may be uniformly distributed or uniformly distributed in the first region. The adhesive layer may be formed at a position corresponding to a space between the subpixels of the liquid crystal panel.

The optical sheet may comprise at least one sheet. For example, the optical sheet may comprise a first sheet. In this case, the adhesive layer includes a first adhesive layer positioned on the first surface of the first sheet and a second adhesive layer positioned on the second surface of the first sheet, and the application position on the plane of the first adhesive layer and the second adhesive layer is partially. Do not overlap or overlap each other.

In addition, an auxiliary adhesive layer may be positioned in a second region of at least one of the first surface and the second surface of the first sheet. In this case, the auxiliary adhesive layer is located on at least one side of four sides constituting the second region of the first sheet.

As another example, the optical sheet may include a first sheet and a second sheet. In this case, the adhesive layer is formed on the first adhesive layer positioned on the first surface of the first sheet, and on the second surface of the first sheet or on the second surface of the second sheet and the second adhesive layer positioned on the first surface of the second sheet. And a third adhesive layer positioned, wherein the application positions on the plane of the first to third adhesive layers partially overlap or do not overlap each other.

In this case, the first sheet and the second sheet may be fixed to each other by a stitch or a staple in the second region. The stitches or staples may be made of fibers, polymers, and metal wires and may be located on at least one of the four sides that make up the second region of the sheet.

When the adhesive layer is unevenly distributed in the first region, the first region may include a central region and a peripheral region, and the adhesive layer distributed in the peripheral region may be more densely distributed than the adhesive layer distributed in the central region.

The liquid crystal display device having the backlight module of such a configuration further includes a liquid crystal panel including a color filter substrate, a TFT substrate, and a liquid crystal layer filled between the substrates.

According to this feature, the adhesive layer for fixing the optical sheet is partially located in the first region corresponding to the display region of the liquid crystal panel.

Therefore, since the tab protruding from the side of the sheet can be removed in the fixing structure by the double-sided tape or the boss, the size of the bezel can be reduced.

In addition, the gap between the parts is kept constant due to the adhesive layer partially positioned in the first region, thereby maintaining the flatness of the optical sheets, preventing the occurrence of the sheet-to-sheet cleavage, and the difference in coefficient of thermal expansion between the sheets. It is possible to prevent the occurrence of warpage due to the problem of.

In addition, since the optical diffusion effect is increased due to the air layer formed between the sheets, it is possible to effectively compensate and offset the degradation of the optical properties due to the adhesive layer.

In addition, when the first adhesive layer and the second adhesive layer do not overlap each other, it is possible to more effectively compensate and cancel the optical property degradation due to the adhesive layer.

In addition, in the case where the second regions of the sheets are fixed by stitches, by setting the looseness of the stitches appropriately, the warpage phenomenon caused by the difference in the thermal expansion coefficient of the sheets can be buffered.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted for simplicity of explanation, and like reference numerals designate like parts throughout the specification.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. When a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the case directly above another portion but also the case where there is another portion in between. On the contrary, when a part is "just above" another part, there is no other part in the middle.

An embodiment of the present invention will now be described with reference to the accompanying drawings.

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the liquid crystal display includes a display module 100, a front cover 200 and a back cover 300 surrounding the display module 100, and a display module 100 with the front cover 200 and / or A fixing member 400 fixed to the back cover 300 may be included.

The front cover 200 may include a front panel (not shown) made of a transparent material that transmits light, and the front panel is disposed at the front of the display module 100 at regular intervals to prevent the display module 100 from external impact. Protect.

The fixing member 400 is fixed to one side of the front cover 200 by a fastening member (not shown) such as a screw, and then the other side supports the display module 100 with respect to the front cover 200 side. The display module 100 may be fixed to the cover 200. Of course, the display module 100 may be directly fixed to the front cover 200 or the back cover 300 by the fastening member.

FIG. 2 is a cross-sectional view illustrating a brief configuration of the display module illustrated in FIG. 1.

Referring to FIG. 2, the display module 100 included in the liquid crystal display device may include a liquid crystal panel 120 and a backlight module 140.

The liquid crystal panel 120 includes a color filter substrate 122 and a TFT substrate 124 bonded to maintain a uniform cell gap, and a liquid crystal layer (not shown) is filled between the two substrates 122 and 124. .

The liquid crystal layer is composed of a plurality of liquid crystal molecules, and the liquid crystal molecules are changed in accordance with the voltage difference generated between the pixel electrode and the common electrode provided in the TFT substrate 124. Therefore, the light provided from the backlight module 140 is incident on the color filter substrate 122 in response to the change in the molecular arrangement of the liquid crystal layer.

An upper polarizer 126 and a lower polarizer 128 may be disposed above and below the liquid crystal panel 120, respectively. In addition, a side of the liquid crystal panel 120 may include a gate and a data driver (not shown) for generating a driving signal for driving the panel 120.

The structure and configuration of the liquid crystal panel 120 is just an example, and the embodiments may be changed, added, or deleted within the scope of the spirit of the present invention.

As shown in FIG. 2, the display module 100 is configured by closely placing the backlight module 140 on the liquid crystal panel 120.

For example, the backlight module 140 may be adhered to and fixed to the lower surface of the liquid crystal panel 120, more specifically, the lower polarizer 128.

By attaching the backlight module 140 to the liquid crystal panel 120 as described above, the overall thickness of the liquid crystal display device may be reduced to improve appearance, and the structure for fixing the backlight module 140 may be removed to remove the structure. Can simplify the structure and manufacturing process.

The liquid crystal panel 120 may be divided into a plurality of areas, and the brightness of light emitted from the area of the backlight module 140 corresponding to the gray peak value or the color coordinate signal of each of the divided areas, that is, the light source The brightness of the liquid crystal panel 120 may be adjusted by adjusting the brightness.

To this end, the backlight module 140 may be operated by being divided into a plurality of divided driving regions corresponding to each of the divided regions of the liquid crystal panel 120.

3 is a cross-sectional view illustrating a configuration of a backlight module according to a first embodiment of the present invention. Referring to FIG. 3, the backlight module 140 may include a light source unit 150 and an optical sheet 160 for supplying light emitted from the light source unit 150 to the liquid crystal panel 120.

The light source unit 150 may include a first layer 152, a plurality of light sources 154, a second layer 156, and a reflective layer 158. The plurality of light sources 154 are formed on the first layer 152, and the second layer 156 is disposed on the first layer 152 to cover the plurality of light sources 154.

The first layer 152 may be a substrate on which the plurality of light sources 154 are mounted, and the substrate may include an adapter (not shown) for supplying power and an electrode pattern (not shown) for connecting the light source 154. Can be formed.

For example, the first layer 152 may be a PCB (Printed Circuit Board) substrate formed using polyethylene terephthalate, glass, polycarbonate and silicon, and the light source 154 and the adapter are connected to an upper surface of the substrate. Carbon nanotube electrode patterns (not shown) may be formed.

The light source 154 may be one of a light emitting diode (LED) chip or a light emitting diode package having at least one light emitting diode chip. Hereinafter, a light emitting diode package is provided as the light source 154.

The light emitting diode package may be divided into a top view method and a side view method according to a direction in which the light emitting surface is directed, and the light source 154 of the present invention is a light emitting diode package of a top view method or a side view method. It may be configured using at least one of.

Although not specifically illustrated, the light source may include a light emitting device that emits light, a mold having a cavity, and a plurality of lead frames. The light emitting device may be the above-mentioned light emitting diode chip.

In addition, a semiconductor element such as a light receiving element and a protection element may be selectively mounted on the lead frame together with the light emitting diode chip inside the cavity. That is, not only the light emitting diode chip but also a protection element such as a zener diode for protecting the light emitting diode chip from static electricity or the like may be mounted on the lead frame.

The second layer 156 disposed above the first layer 152 and covering the plurality of light sources 154 transmits the light to uniformly provide the light emitted from the light source 154 to the liquid crystal panel 120. And spread at the same time.

The second layer 156 may be made of a light transmissive material, for example, silicone or acrylic resin. However, the second layer 156 is not limited to the above material and may be formed of various resins.

In addition, the second layer 156 may be formed of a resin having a refractive index of about 1.4 to 1.6 so that the light emitted from the light source 154 is diffused so that the backlight module 140 has a uniform brightness. For example, the second layer 156 may be formed of any one material selected from the group consisting of polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polystyrene and polyepoxy, silicone, acrylic, and the like.

The second layer 156 may include a polymer resin having a predetermined adhesiveness to firmly adhere to the light source 154 and the reflective layer 158. For example, the second layer 156 may comprise unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, Hydroxy ethyl methacrylate, hydroxy propyl methacrylate, hydroxy ethyl acrylate, acrylamide, metyrol acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, 2 -Acryl-based, urethane-based, epoxy-based, melamine-based, and the like, such as ethyl hexyl acrylate polymer or copolymer or terpolymer.

Meanwhile, the second layer 156 may be formed by applying a liquid or gel resin to the upper surface of the first layer 152 on which the plurality of light sources 154 and the reflective layer 158 are formed, and then curing the resin. It may be manufactured separately and adhered to an upper surface of the first layer 152.

As the thickness of the second layer 156 increases, the light emitted from the light source 154 may be spread more widely, but the amount of light absorbed by the second layer 156 may increase to decrease the luminance. Therefore, the thickness of the second layer 156 is preferably 0.1 to 4.5 nm so as to provide light of uniform brightness without greatly reducing the brightness of the light provided from the backlight module 140 to the liquid crystal panel 120.

Meanwhile, the plurality of diffusion particles 156a may be dispersed in the second layer 156. The diffusing particles 156a scatter or refract light incident on the second layer 156 so that the light emitted from the light source unit 150 is diffused more widely. To this end, the diffusion particles 156a may be made of a material having a refractive index different from that of the material constituting the second layer 156.

The reflective layer 158 formed between the first layer 152 and the second layer 156, and more specifically, on the top surface of the first layer 152, is formed by the second layer 156 of the light emitted from the light source 154. The light is diffused widely by reflecting light totally reflected from the boundary.

The reflective layer 158 may include a white pigment such as titanium oxide dispersed in a sheet of a synthetic resin material, a metal deposition film laminated on a surface thereof, or a bubble dispersed to scatter light in a synthetic resin sheet. In order to increase the reflectivity, silver (Ag) may be coated on the surface. Meanwhile, the reflective layer 158 may be formed by coating the upper surface of the first layer 152.

The reflective layer 158 may be formed with a pattern (not shown) for facilitating propagation of light emitted from the light source 154 to the adjacent light source 154. The pattern may include a plurality of protrusions, and the density of the protrusions may increase farther from any one light source 154, that is, closer to an adjacent light source 154.

Accordingly, it is possible to prevent the luminance of light emitted upward from the region far from the light source 154, that is, the region close to the adjacent light source 154.

The plurality of light sources 154 may be arranged to emit light in different directions. That is, some of the light sources 154 may be configured as side view LED chips, and the other light sources 154 may be configured as top view LED chips.

In addition, some light sources may emit light in the left direction of FIG. 3, and others may emit light in the right direction of FIG. 3.

As such, by forming the light emission directions of the light sources in opposite directions, the phenomenon in which the luminance is concentrated or weakened in a specific region of the light source unit 154 may be reduced.

On the other hand, a large amount of light may be emitted in a region adjacent to the light source 154 by the strong scattering phenomenon near the light source 154 or the light emitted in a direction closer to the upper side from the light source 154.

In order to solve this problem, a light shielding pattern (not shown) is formed on the second layer 156 to reduce the luminance of light emitted from an area adjacent to the light source 154 to provide uniform luminance from the light source unit 150. Light can be emitted. The light shielding pattern may be composed of titanium dioxide.

The second layer 156 may be formed of first and second resin layers made of the same or different materials.

A support member (not shown) made of a metal having electrical conductivity, for example, a solder pad, may be provided to support and fix the light source 154 on the first layer 152. At this time, in order to reduce the occurrence of power loss due to the increase in resistance, the thickness of the support member may be formed to 0.14mm or less.

The reflective layer 158 may be formed to a thickness of 0.03 to 0.14 mm in order to improve the incident efficiency of light and to reflect most of the light incident from the light source 154.

The reflective layer 158 may be configured to have different reflectances according to the formed position. For example, the reflective layer 158 may be configured by alternately disposing a first reflective layer and a second reflective layer having different refractive indices.

In this case, the first reflective layer may be composed of a specular reflection sheet, and the second reflective layer may be composed of a diffuse reflection sheet.

On the other hand, in order to make the luminance of the light emitted from the light source unit 150 uniform, the first reflecting layer and the second reflecting layer may be formed in an appropriate range, and the second reflecting layer is configured such that the reflectance gradually increases or decreases according to the position. can do.

In the light source unit 150 having such a configuration, the optical sheet 160 including the first sheet 162 may be positioned on the second layer 156. The first sheet 162 may be a prism sheet that condenses the light of the light source unit 150 and supplies the light to the liquid crystal panel 120.

4 is a plan view showing a first surface of the first sheet according to the first embodiment of the present invention.

Referring to FIG. 4, the first sheet 162 includes a first area A1 corresponding to the display area of the liquid crystal panel 120 and a second area A2 corresponding to the non-display area. A light transmissive first adhesive layer 172 and a second adhesive layer 174 are formed on the first surface 162a and the second surface 162b of 162, respectively.

In this case, the first adhesive layer 172 and the second adhesive layer 174 are positioned in the first area A1 and are formed of a plurality of adhesives formed in a dot shape. Here, the shape of the first adhesive layer 172 and the second adhesive layer 174 may be formed in a rib shape or other shapes.

The first adhesive layer 172 and the second adhesive layer 174 are uniformly distributed in the first region A1, and the sum of the total areas of the plurality of adhesives constituting the first adhesive layer 172 and the second adhesive layer 174. It is formed with less than 50% of the total area of this first sheet 162.

According to this configuration, the first sheet 162 and the second layer 156 are bonded by the first adhesive layer 172, and the first sheet 162 and the liquid crystal panel 120 are attached to the second adhesive layer 174. Are bonded by. Also, between the first sheet 162 and the second layer 156 and between the first sheet 162 and the liquid crystal panel 120 by the first adhesive layer 172 and the second adhesive layer 174, a predetermined distance d Is maintained. For this reason, an air layer is formed in the space between the first sheet 162 and the second layer 156 and the space between the first sheet 162 and the liquid crystal panel 120.

When the air layer is formed in this way, it is possible to compensate and cancel the optical property of the adhesive site is reduced due to the optical diffusion effect due to the adhesive layer. Here, the optical diffusion effect refers to the effect due to the diffusion action occurring in the air layer. According to such a configuration, even if the first adhesive layer 172 and the second adhesive layer 174 are positioned in the first region A1, the image quality may be prevented from being degraded due to the adhesive layers 172 and 174.

On the other hand, when the second adhesive layer 174 is formed at a position overlapping with the first adhesive layer 172, the optical properties at the bonding site may be reduced. In order to prevent this, the second adhesive layer 174 is preferably formed at a position not overlapping with the first adhesive layer 172.

In order to facilitate understanding of the present invention, in FIG. 4, the second adhesive layer 174 formed on the second surface 162b of the first sheet 162 is illustrated by dotted lines.

In the above description, the first adhesive layer 172 and the second adhesive layer 174 do not overlap with each other. However, the first adhesive layer 172 and the second adhesive layer ( It is also possible that some of the parts 174 overlap.

5 is a plan view showing a first surface of a first sheet according to a second embodiment of the present invention. Hereinafter, a description of the same configuration as that of the first embodiment of the configuration of the first sheet shown in FIG. 5 will be omitted.

In the second embodiment of FIG. 5, the auxiliary adhesive layer 176 is formed in the second region A2 of at least one of the first surface 162a or the second surface 162b of the first sheet 162. .

FIG. 5 illustrates the formation of the auxiliary adhesive layer 176 on the first surface 162a of the first sheet 162, but not the second adhesive layer 174 formed on the second surface 162b.

The auxiliary adhesive layer 176 may be formed at the lower end of the first sheet 162 as shown, and although not shown, an upper end portion, a left end portion and a right end portion, a left end portion and a lower end portion, or an upper and lower portion of the first sheet 162. It may be formed at the left and right ends.

In addition, the auxiliary adhesive layer 176 may be formed only in a partial region of the lower portion, unlike in FIG. 5, and may be formed in a dot shape or a rib shape like the first adhesive layer 172 and the second adhesive layer 174.

In the present exemplary embodiment, although the first adhesive layer 172 is formed in the first region A1 of the first sheet 162 and the auxiliary adhesive layer 176 is formed in the second region A2, the first region ( It is also possible not to form the 1st adhesive layer 172 in A1).

As such, it is not necessary to use the auxiliary adhesive layer 176 together with the first adhesive layer 172 or the second adhesive layer 174.

6 is a plan view showing a first surface of a first optical sheet according to a third embodiment of the present invention. Hereinafter, the description of the same configuration as that of the first embodiment of the configuration of the first sheet shown in FIG. 6 will be omitted.

The above-described embodiment has described that the first adhesive layer 172 and the second adhesive layer 174 are uniformly distributed in the first region A1.

However, the first adhesive layer 172 may be unevenly distributed in the first region A1 as shown in FIG. 6. Of course, it is also possible to form the second adhesive layer 174 to have a non-uniform distribution like the first adhesive layer 172.

When viewing an image displayed on the liquid crystal panel 120, the viewer's eyes typically face the center of the liquid crystal panel 120.

With this in mind, the first area A1 is divided into a center area A11 and a peripheral area A12, and the distribution of the first adhesive layer 172 in the center area A11 to which the viewer's eyes are directed is surrounded. It can be formed less densely than the area A12.

According to this configuration, there is an effect that the viewer can not easily recognize that the optical characteristics are degraded due to the adhesive layer.

7 is a cross-sectional view illustrating a configuration of a backlight module according to a second embodiment of the present invention. Hereinafter, a description of the same configuration as that of the above-described first embodiment among the structures of the second embodiment shown in FIG. 7 will be omitted.

The light source unit 150 includes a first layer 152, a plurality of light sources 154, a second layer 156, and a reflective layer 158. The second layer 156 may or may not include the plurality of diffusion particles 156a.

The optical sheet 160, for example, the first sheet 162 and the second sheet 164 may be sequentially disposed on the second layer 156. The first sheet 162 may be a diffusion sheet for diffusing the light of the light source unit 150, and the second sheet 164 may be a prism sheet for collecting and supplying the diffused light to the liquid crystal panel 120.

A first adhesive layer 172 is positioned on the first surface 162a of the first sheet 162 and the second surface 162b of the first sheet 162 or the first surface 164a of the second sheet 164. A second adhesive layer 174 is located thereon, and a third adhesive layer 178 is located on the second surface 164b of the second sheet 164.

The first adhesive layer 174 to the third adhesive layer 178 are uniformly distributed or unevenly distributed in the first region A1.

According to this configuration, the first sheet 162 and the second layer 156 are bonded by the first adhesive layer 172, and the first sheet 162 and the second sheet 164 are the second adhesive layer 174. The second sheet 164 and the liquid crystal panel 120 are bonded by the third adhesive layer 178.

The first adhesive layer 172 to the third adhesive layer 178 may be formed at a position not overlapping or may be formed at a portion overlapping with each other.

8 is a plan view showing a first surface of a second sheet according to the first embodiment of the present invention. In the present embodiment, the second area A2 of the second sheet 164 is fixed to the second area A2 of the first sheet 162 by stitches 176a or staples.

Stitch 176a or staples may be made of fibers, polymers, and metal wires. The stitches 176a or staples may be formed at various positions of the sheet in the second region A2 like the auxiliary adhesive layer 176.

9 is a conceptual diagram for illustrating a positional relationship between an adhesive layer and a subpixel of a liquid crystal panel.

In the TFT substrate 124 of the liquid crystal panel 120, a plurality of data lines and a plurality of gate lines are arranged to cross each other, and subpixels R, G, and B are formed in the crossing regions of the lines.

Therefore, as shown in the drawing, when the adhesive layers 172 and 174 are formed in the first region A1 at a position corresponding to the space between the subpixels R, G, and B of the liquid crystal panel 120, the optical characteristics may be degraded due to the adhesive layer. It is possible to suppress it.

Although the backlight module having the light source unit configured in the form of a film has been described above, the adhesive structure of the optical sheet can be used in a conventional edge type backlight module using a light guide plate and a general direct type backlight module using a diffusion plate.

In the case of the large-screen liquid crystal display, a plurality of backlight modules may be arranged in a matrix form. In this case, the backlight module may be driven by a full driving method or a partial driving method such as local dimming or impulsive. In addition, when a failure occurs in any one of the backlight modules, only the defective backlight module needs to be replaced, thereby facilitating replacement work and reducing component replacement costs.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a brief configuration of the display module illustrated in FIG. 1.

3 is a cross-sectional view illustrating a configuration of a backlight module according to a first embodiment of the present invention.

4 is a plan view showing a first surface of the first sheet according to the first embodiment of the present invention.

5 is a plan view showing a first surface of a first sheet according to a second embodiment of the present invention.

6 is a plan view showing a first surface of the first sheet according to the third embodiment of the present invention.

7 is a cross-sectional view illustrating a configuration of a backlight module according to a second embodiment of the present invention.

8 is a plan view showing a first surface of a second sheet according to the first embodiment of the present invention.

9 is a conceptual diagram for illustrating a positional relationship between an adhesive layer and a subpixel of a liquid crystal panel.

Brief description of the main parts of the drawing

100: display module 120: liquid crystal panel

140: backlight module 150: light source

160: optical sheet 172: first adhesive layer

174: second adhesive layer 176: auxiliary adhesive layer

176a: stitch 178: third adhesive layer

A1: first region A11: center region

A12: peripheral area A2: second area

Claims (29)

A light source unit including at least one light source; And Located in the rear of the liquid crystal panel, the optical sheet for supplying the light of the light source to the liquid crystal panel Including, The optical sheet includes a first region and a second region respectively corresponding to the display area and the non-display area of the liquid crystal panel, and the light transmitting adhesive layer is partially positioned in the first area. In claim 1, The light source unit, A first layer mounting the light source; And A second layer positioned over the first layer and covering the light source Backlight module comprising a. In claim 2, The backlight module further comprises a reflective layer formed between the first layer and the second layer. The method according to any one of claims 1 to 3, And the adhesive layer is uniformly distributed in the first region. In claim 4, And the adhesive layer is formed at a position corresponding to a space between subpixels of the liquid crystal panel. In claim 4, The optical sheet includes a first sheet, and the adhesive layer includes a first adhesive layer positioned on a first surface of the first sheet and a second adhesive layer positioned on a second surface of the first sheet. 1. A backlight module in which the application positions on the plane of the adhesive layer and the second adhesive layer partially overlap or do not overlap each other. In claim 6, And a second adhesive layer on a second region of at least one of the first surface and the second surface of the first sheet. In claim 7, The auxiliary adhesive layer is located on at least one side of the four sides constituting the second region of the first sheet. In claim 4, The optical sheet includes a first sheet and a second sheet, and the adhesive layer includes a first adhesive layer positioned on a first surface of the first sheet, a second surface of the first sheet, or a first surface of the second sheet. And a third adhesive layer positioned on a second surface of the second sheet, wherein the coating positions on the plane of the first to third adhesive layers partially overlap or do not overlap each other. The method of claim 9, And the first sheet and the second sheet are fixed to each other by a stitch or a staple in the second area. In claim 10, The stitch or staple is a backlight module consisting of a wire of fiber, polymer and metal. In claim 11, The stitch or staple is located on at least one side of the four sides constituting the second area of the sheet. The method according to any one of claims 1 to 3, And the adhesive layer is unevenly distributed in the first region. The method of claim 13, The first region includes a center region and a peripheral region, and the adhesive layer distributed in the peripheral region is densely distributed than the adhesive layer distributed in the central region. The method of claim 13, And the adhesive layer is formed at a position corresponding to a space between subpixels of the liquid crystal panel. The method of claim 13, The optical sheet includes a first sheet, and the adhesive layer includes a first adhesive layer positioned on a first surface of the first sheet and a second adhesive layer positioned on a second surface of the first sheet. 1. A backlight module in which the application positions on the plane of the adhesive layer and the second adhesive layer partially overlap or do not overlap each other. The method of claim 16, And a second adhesive layer on a second region of at least one of the first surface and the second surface of the first sheet. The method of claim 17, The auxiliary adhesive layer is located on at least one side of the four sides constituting the second region of the first sheet. The method of claim 13, The optical sheet includes a first sheet and a second sheet, and the adhesive layer includes a first adhesive layer positioned on a first surface of the first sheet, a second surface of the first sheet, or a first surface of the second sheet. And a third adhesive layer positioned on a second surface of the first sheet, wherein the coating positions on the plane of the first to third adhesive layers partially overlap or do not overlap each other. The method of claim 19, And the first sheet and the second sheet are fixed to each other by a stitch or a staple in the second area. The method of claim 20, The stitch or staple is a backlight module consisting of a wire of fiber, polymer and metal. The method of claim 21, The stitch or staple is located on at least one side of the four sides constituting the second area of the sheet. Liquid crystal panels; A backlight module supplying light to the liquid crystal panel; And Front cover and back cover surrounding the liquid crystal panel and the backlight module To include, the backlight module, A light source unit including at least one light source; And Located in the rear of the liquid crystal panel, the optical sheet for supplying the light of the light source to the liquid crystal panel Including; The optical sheet includes a first region and a second region corresponding to the display region and the non-display region of the liquid crystal panel, respectively, wherein the light transmissive adhesive layer is partially positioned in the first region. The method of claim 23, And the backlight module is adhesively fixed to the liquid crystal panel. The method of claim 23, The light source unit, A first layer mounting the light source; A second layer on the first layer and covering the light source; And And a reflective layer formed between the first layer and the second layer. The method according to any one of claims 23 to 25, The liquid crystal display device wherein the adhesive layer is uniformly distributed in the first region. The method according to any one of claims 23 to 25, The liquid crystal display device wherein the adhesive layer is unevenly distributed in the first region. The method of claim 27, The first region includes a central region and a peripheral region, and the adhesive layer distributed in the peripheral region is densely distributed than the adhesive layer distributed in the central region. The method according to any one of claims 23 to 24, And the adhesive layer is formed at a position corresponding to a space between subpixels of the liquid crystal panel.

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