KR102325000B1 - Diffusion Plate and Backlight Unit and Liquid Crystal Display Device using the same - Google Patents

Abstract

The present invention relates to a diffusion plate including a first diffusion plate and a second diffusion plate bonded using an adhesive member, a backlight unit including the diffusion plate, and a liquid crystal display, wherein the size of the diffusion plate can be increased. Accordingly, it is possible to implement a large-sized backlight unit and a liquid crystal display using the same.

Description

Diffusion Plate and Backlight Unit and Liquid Crystal Display Device using the same

The present invention relates to a liquid crystal display device, and more particularly, to a diffusion plate provided in a backlight unit.

A liquid crystal display device includes an upper substrate, a lower substrate, and a liquid crystal layer formed between the two substrates, and the arrangement of the liquid crystal layer is adjusted depending on whether or not an electric field is applied, and the transmittance of light is adjusted accordingly to display an image. .

Since the liquid crystal display is non-luminous unlike other flat panel displays, a backlight unit is configured as a light source under the liquid crystal panel. Such a backlight unit is a direct-type method in which a light source is disposed on the entire lower surface of the liquid crystal panel to directly transmit the light emitted from the light source toward the liquid crystal panel, and a light source is disposed on the lower side of the liquid crystal panel to transmit the light emitted from the light source to the light guide plate. It can be divided into an edge-type method that is transmitted to the liquid crystal panel through the Hereinafter, a conventional direct-type backlight unit will be described with reference to the drawings.

1 is a schematic cross-sectional view of a conventional backlight unit.

As can be seen from FIG. 1 , a conventional backlight unit includes a case 10 , a reflection plate 20 , a light source 30 , and a diffusion plate 40 .

The reflector 20 is formed on the upper surface of the case 10 to reflect the light emitted from the light source 30 in an upward direction.

The light source 30 is formed on the reflection plate 20 to emit a predetermined light.

The diffusion plate 40 is formed above the light source 30 to diffuse the light emitted from the light source 30 so that uniform light can be transmitted to the liquid crystal panel.

In order to manufacture a large-sized liquid crystal display in order to meet the various demands of consumers, the size of the backlight unit must also be increased. However, there is a limit in increasing the size of the diffusion plate 40 when the current mass-produced diffusion plate 40 manufacturing equipment is used. Accordingly, there is a need for a method for obtaining a large-sized diffuser plate 40 applicable to a large-sized backlight unit.

The present invention has been devised to meet the above-mentioned conventional needs, and an object of the present invention is to provide a diffuser plate that can be realized in a large size, and a backlight unit and a liquid crystal display using the same.

In order to achieve the above object, the present invention provides a diffusion plate including a first diffusion plate and a second diffusion plate bonded using an adhesive member, a backlight unit including the diffusion plate, and a liquid crystal display device.

According to the present invention as described above, there are the following effects.

According to an embodiment of the present invention, by bonding the first diffusion plate and the second diffusion plate using an adhesive member to form a diffusion plate, the size of the diffusion plate can be increased, and accordingly, a large-sized backlight unit and a large-sized backlight unit using the same It becomes possible to realize a liquid crystal display device. In particular, it is possible to appropriately adjust the sizes of the first and second diffusion plates, and to increase the number of diffusion plates to be adhered through an adhesive member, so that large diffusion plates of various sizes can be realized.

1 is a schematic cross-sectional view of a conventional backlight unit.
2 is a schematic cross-sectional view of a backlight unit according to an embodiment of the present invention.
3A is a schematic cross-sectional view of a backlight unit according to another embodiment of the present invention, and FIGS. 3B and 3C are schematic plan views illustrating an arrangement of support members provided in the backlight unit according to another embodiment of the present invention. .
4A and 4B are schematic plan views illustrating an arrangement of light sources included in a backlight unit according to another embodiment of the present invention.
5A is a schematic cross-sectional view of a backlight unit according to another embodiment of the present invention, and FIG. 5B is a schematic bottom view of a diffusion plate provided in the backlight unit according to another embodiment of the present invention.
6A is a schematic cross-sectional view of a backlight unit according to another embodiment of the present invention, and FIG. 6B is a schematic plan view of a reflector provided in the backlight unit according to another embodiment of the present invention.
7 is a schematic plan view of a diffusion plate provided in a backlight unit according to another embodiment of the present invention.
8 is a schematic cross-sectional view of a liquid crystal display according to an exemplary embodiment.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction 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, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, and thus the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. 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, the detailed description thereof will be omitted. When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

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

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between the two parts unless 'directly' is used.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal relationship is described with 'after', 'following', 'after', 'before', etc. It may include cases that are not continuous unless this is used.

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

Each feature of the various embodiments of the present invention may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be implemented independently of each other or may be implemented together in a related relationship. may be

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

2 is a schematic cross-sectional view of a backlight unit according to an embodiment of the present invention.

As can be seen from FIG. 2 , the backlight unit according to an embodiment of the present invention includes a case 100 , a reflection plate 200 , a light source 300 , and a diffusion plate 400 .

The case 100 includes a flat lower structure, a side structure bent at a predetermined angle from both ends of the lower structure, and a support structure extending flat from the end of the side structure to the lower structure. The light source 300 is disposed on the lower structure of the case 100 , and the diffusion plate 400 is seated on the support structure of the case 100 . The structure of the case 100 may be changed in various forms known in the art.

The reflective plate 200 is formed on the upper surface of the case 100 so that the light emitted from the light source 300 proceeds in an upward direction. The reflector 200 may be formed on the upper surface of the lower structure and the side structure of the case 100 , but is not limited thereto. For example, the reflective plate 200 may extend on the support structure of the case 100 , or may be formed only on the lower structure of the case 100 .

The light source 300 is formed on the upper surface of the reflection plate 200 . The light source 300 may be formed of various types of light emitting devices (LEDs) known in the art. A plurality of the light sources 300 are disposed on the upper surface of the reflector 200 at predetermined intervals.

The diffusion plate 400 is formed on the upper side of the light source 300 . Accordingly, the light emitted from the light source 300 and the light reflected from the reflection plate 200 may be uniformly diffused while passing through the diffusion plate 400 .

The diffusion plate 400 includes a first diffusion plate 410 , a second diffusion plate 420 , and an adhesive member 430 .

The first diffusion plate 410 and the second diffusion plate 420 are adhered by the adhesive member 430 . Specifically, the side surface 411 of the first diffusion plate 410 and the side surface 421 of the second diffusion plate 420 are bonded to each other while facing each other with the adhesive member 430 interposed therebetween. The size and structure of the first diffusion plate 410 and the second diffusion plate 420 may be the same, but are not limited thereto.

As described above, the diffusion plate 400 according to an embodiment of the present invention is manufactured by bonding the first diffusion plate 410 and the second diffusion plate 420 using the adhesive member 430 to form the diffusion plate 400 . The size of the plate 400 can be increased, and accordingly, a large-sized backlight unit and a liquid crystal display using the same can be realized. In particular, by appropriately adjusting the sizes of the first diffusion plate 410 and the second diffusion plate 420 and increasing the number of diffusion plates adhered through the adhesive member 430 , the large diffusion plates of various sizes are implementation is possible.

In order for the light that has passed through the diffusion plate 400 to be uniformly diffused, a deviation in light transmittance between the light passing through the first and second diffusion plates 410 and 420 and the light passing through the adhesive member 430 is reduced. need to be minimized. Accordingly, in one embodiment of the present invention, optical clear adhesive (OCA) having excellent light transmittance may be used as the material of the adhesive member 430 .

On the other hand, the boundary region between the first diffusion plate 410 and the adhesive member 430 and the boundary region between the second diffusion plate 420 and the adhesive member 430 have lower light transmittance compared to other regions. Accordingly, a problem in which dark stripes are seen in the boundary region may occur. Therefore, a method for improving the light transmittance in the boundary region is required.

In an embodiment of the present invention, mirror-like finishing is performed on the side surface 411 of the first diffusion plate 410 and the side surface 421 of the second diffusion plate 420 corresponding to the boundary region. It is possible to improve the surface uniformity by performing precision processing such as As described above, when the surface uniformity of the side surface 411 of the first diffusion plate 410 and the side surface 421 of the second diffusion plate 420 is improved, the first diffusion plate 410 and the adhesive member 430 are improved. The transmittance of light passing through the boundary region of , and the boundary region between the second diffusion plate 420 and the adhesive member 430 may be improved.

The upper surface 412 and the lower surface 413 of the first diffusion plate 410 and the upper surface 422 and the lower surface 423 of the second diffusion plate 420 have a fine concavo-convex structure for light diffusion, so that the surface uniformity is improved. On the other hand, it is preferable that the side surface 411 of the first diffusion plate 410 and the side surface 421 of the second diffusion plate 420 have good surface uniformity. That is, the side surface 411 of the first diffusion plate 410 preferably has better surface uniformity than the upper surface 412 and the lower surface 413 of the first diffusion plate 410 , and the second diffusion plate 410 has a better surface uniformity. It is preferable that the side surface 421 of the 420 has better surface uniformity than the upper surface 422 and the lower surface 423 of the second diffusion plate 420 .

In addition, the light source 300 may be preferably disposed at a position facing the adhesive member 430 to increase the transmittance of light passing through the adhesive member 430 .

3A is a schematic cross-sectional view of a backlight unit according to another embodiment of the present invention, and FIGS. 3B and 3C are schematic plan views illustrating an arrangement of support members provided in the backlight unit according to another embodiment of the present invention. , which is the same as the backlight unit according to FIG. 2 described above, except that the support member 500 is further included. Accordingly, the same reference numerals are assigned to the same components, and only different components will be described below.

As can be seen from FIG. 3A , according to another embodiment of the present invention, a support member 500 is formed between the reflection plate 200 and the diffusion plate 400 . The support member 500 may prevent the diffusion plate 400 from sagging by supporting the lower surface of the diffusion plate 400 . The plurality of support members 500 are formed in a plurality of rows to effectively prevent sagging of the diffusion plate 400 .

As can be seen from FIGS. 3B and 3C , the arrangement intervals of the plurality of support members 400 are not all the same. Specifically, the distance L1 between the support members 500 disposed in any one row positioned close to the adhesive member 430 , in particular, the row closest to the adhesive member 430 , L1 is relatively high. It may be formed to be smaller than the distance L2 between the support members 500 arranged in any one row far from the member 430 . Since the possibility of deflection of the diffusion plate 400 at the position where the adhesive member 430 is formed is relatively large, the gap L1 between the support members 500 arranged in rows positioned close to the adhesive member 430 . By forming the s to be relatively small, sagging of the diffusion plate 400 can be more effectively prevented.

The gap L1 between the adhesive member 430 and the support members 500 disposed in the closest row is formed to be smaller than the gap L2 between the support members 500 disposed in the other row, and The spacing L2 between the support members 500 may be formed to be the same, but is not necessarily limited thereto.

In addition, as can be seen from FIG. 3B , the spacing W between the support members 500 disposed in one row and the support members 500 disposed in an adjacent row may be the same, but is limited thereto. As can be seen from FIG. 3C , with the adhesive member 430 interposed therebetween, the interval W1 between the two rows closest to the adhesive member 430 is set between any other two adjacent rows. It is also possible to form the gap W2 smaller than the distance W2 between the row furthest from the adhesive member 430 and the row adjacent thereto. As described above, by increasing the number of the support members 500 arranged close to the adhesive member 430 , the sagging of the diffusion plate 400 can be effectively prevented.

Hereinafter, in the region in which the adhesive member 430 is formed, in the boundary region between the first diffusion plate 410 and the adhesive member 430 , and in the boundary region between the second diffusion plate 420 and the adhesive member 430 . Various embodiments of the present invention that can improve the light transmittance of the will be described.

4A and 4B are schematic plan views illustrating an arrangement of a light source 300 provided in a backlight unit according to another embodiment of the present invention.

According to FIGS. 4A and 4B , the arrangement intervals of the plurality of light sources 300 are not all the same. Specifically, the distance L1 between the light sources 300 arranged in the row facing the adhesive member 430 is the light source 300 arranged in any one row of the position not facing the adhesive member 430 . It may be formed to be smaller than the interval L2 between them. Accordingly, a region where the adhesive member 430 is formed, a boundary region between the first diffusion plate 410 and the adhesive member 430 , and a boundary region between the second diffusion plate 420 and the adhesive member 430 . It is possible to improve the light transmittance in

As illustrated, all of the intervals L2 between the light sources 300 disposed in a column of positions that do not face the adhesive member 430 may be equally formed, but the present invention is not limited thereto. In some cases, it is also possible to form the distance L2 between the adhesive member 430 and the light sources 300 disposed in the closest row to be smaller than the distance L2 between the light sources 300 disposed in the remaining rows. .

In addition, as can be seen from FIG. 4A , the distance between the light sources 300 arranged in one column and the light sources 300 arranged in an adjacent column may be the same, but is not necessarily limited thereto, and in FIG. 4B As can be seen, the spacing W1 between the row facing the adhesive member 430 and the row adjacent thereto is the spacing W2 between any two adjacent rows, for example, the adhesive member ( It is also possible to form smaller than the distance W2 between the row furthest from 430 and the adjacent row.

As described above, by increasing the number of light sources 300 arranged close to the adhesive member 430 , the formation area of the adhesive member 430 , the first diffusion plate 410 and the adhesive member 430 are increased. The light transmittance in the boundary region and the boundary region between the second diffusion plate 420 and the adhesive member 430 may be improved.

Although not shown, the support member 500 according to FIGS. 3A to 3C may be additionally provided to the structure according to FIGS. 4A to 4C .

5A is a schematic cross-sectional view of a backlight unit according to another embodiment of the present invention, and FIG. 5B is a schematic bottom view of a diffuser plate provided in the backlight unit according to another embodiment of the present invention, which is provided on the diffuser plate. It is the same as the backlight unit according to FIG. 2 described above, except that diffusion patterns 415 and 425 are additionally provided. Accordingly, the same reference numerals are assigned to the same components, and only different components will be described below.

As can be seen from FIGS. 5A and 5B , a first diffusion pattern 415 is formed on the lower surface of the first diffusion plate 410 , and a second diffusion pattern 425 is formed on the lower surface of the second diffusion plate 420 . is formed

The first diffusion pattern 415 is not formed uniformly on the entire lower surface of the first diffusion plate 410 , but is formed adjacent to the adhesive member 430 . That is, the first diffusion pattern 415 is formed in a region close to the adhesive member 430 with respect to the center line C of the first diffusion plate 410 . As described above, since the first diffusion pattern 415 is formed adjacent to the adhesive member 430 , the light emitted from the light source 300 passes through the first diffusion pattern 415 and the first diffusion plate 410 . ) and the adhesive member 430 or a region where the adhesive member 430 is formed, so that the first diffusion plate 410 and the adhesive member 430 are at a boundary region or the adhesive member 430 . The light transmittance in the formation region of 430 may be improved. In the present specification, the position adjacent to the adhesive member 430 corresponding to the position where the first diffusion pattern 415 is formed means that the light emitted from the light source 300 passes through the first diffusion pattern 415 . It means a position at which the first diffusion plate 410 and the adhesive member 430 may be incident on the boundary region or the formation region of the adhesive member 430 .

The first diffusion pattern 415 may include a plurality of dot patterns arranged in at least one row near the adhesive member 430 . Although FIG. 5B illustrates that the first diffusion patterns 415 are arranged in two columns, the present invention is not limited thereto, and may be arranged in one column or three or more columns.

The second diffusion pattern 425 is not formed uniformly on the entire lower surface of the second diffusion plate 420 , but is formed adjacent to the adhesive member 430 . That is, the second diffusion pattern 425 is formed in a region close to the adhesive member 430 with respect to the center line C of the second diffusion plate 420 . As described above, since the second diffusion pattern 425 is formed at a position adjacent to the adhesive member 430 , the light emitted from the light source 300 passes through the second diffusion pattern 425 and the second diffusion plate 420 . ) and the adhesive member 430 or the region where the adhesive member 430 is formed, so that the second diffusion plate 420 and the adhesive member 430 are at the boundary region or the adhesive member. The light transmittance in the formation region of 430 may be improved. In the present specification, the position adjacent to the adhesive member 430 corresponding to the position where the second diffusion plate 420 is formed means that the light emitted from the light source 300 passes through the second diffusion pattern 425 . It means a position at which the second diffusion plate 420 and the adhesive member 430 may be incident on a boundary region or a formation region of the adhesive member 430 .

The second diffusion pattern 425 may include a plurality of dot patterns arranged in at least one row near the adhesive member 430 . Although the drawing shows that the second diffusion patterns 425 are arranged in two columns, the present invention is not limited thereto, and may be arranged in one column or three or more columns.

Although not shown, the support member 500 according to FIGS. 3A to 3C may be additionally provided to the structure according to FIGS. 5A and 5B, and the light source 300 may have the same structure as FIGS. 4A and 4B described above. ) can be placed.

6A is a schematic cross-sectional view of a backlight unit according to another embodiment of the present invention, and FIG. 6B is a schematic plan view of a reflector provided in the backlight unit according to another embodiment of the present invention, which is a first and second It is the same as the backlight unit according to FIGS. 5A and 5B described above, except that an adhesive layer 600 and a reflective sheet 700 are additionally provided on the lower surfaces of the diffusion patterns 415 and 425 . Accordingly, the same reference numerals are assigned to the same components, and only different components will be described below.

As can be seen from FIGS. 6A and 6B , a reflective sheet 700 is formed on lower surfaces of the first and second diffusion patterns 415 and 425 . The reflective sheet 700 is adhered to the first and second diffusion patterns 415 and 425 , the adhesive member 430 , the first diffusion plate 410 and the second diffusion plate 420 through the adhesive layer 600 . has been The adhesive layer 600 may use OCA (Optical Clear Adhesive) having excellent light transmittance.

The reflective sheet 700 includes a transmissive part 710 and a reflective part 720 .

The transmitting part 710 allows the light emitted from the light source 300 to move toward the upper portion of the reflective sheet 700 . As can be seen from FIG. 6B , the transmission portion 710 may include a plurality of transmission holes arranged at predetermined intervals. By increasing the size of the transmission holes, increasing the number of transmission holes, or reducing the spacing between the transmission holes, the amount of light emitted from the light source 300 and moving toward the upper portion of the reflective sheet 700 may be increased.

The reflector 720 reflects the light traveling downward after colliding with the first and second diffusion patterns 415 and 425 in the upper direction again. The light transmittance in the boundary region between the first and second diffusion plates 410 and 420 and the adhesive member 430 or in the region where the adhesive member 430 is formed may be improved by the reflection unit 720 . have.

By appropriately adjusting the transmitting part 710 and the reflecting part 720, the amount of light moving from the bottom to the top is minimized while reflecting the light moving from the top to the bottom, so that the first and second diffusion plates 410 , 420 ) and the adhesive member 430 may improve light transmittance at a boundary region or in a region where the adhesive member 430 is formed.

Although not shown, the support member 500 according to FIGS. 3A to 3C may be additionally provided to the structure according to FIGS. 6A and 6B , and the light source 300 may have the same structure as in FIGS. 4A and 4B described above. ) can be placed.

7 is a schematic plan view of a diffusion plate provided in a backlight unit according to another embodiment of the present invention.

As can be seen from FIG. 7 , the diffusion plate according to another embodiment of the present invention includes a first diffusion plate 410 , a second diffusion plate 420 , a third diffusion plate 440 , and a fourth diffusion plate 450 . , and an adhesive member 430 .

The first diffusion plate 410 , the second diffusion plate 420 , the third diffusion plate 440 , and the fourth diffusion plate 450 are bonded to each other through the adhesive member 430 . As shown, the adhesive member 430 is formed in a cross structure, the first diffusion plate 410 is disposed on the upper left side, the second diffusion plate 420 is disposed on the right side, and the second diffusion plate 410 is disposed on the right side. The third diffusion plate 440 may be disposed on the lower left side, and the fourth diffusion plate 450 may be disposed on the lower right side.

The detailed configuration of each of the first diffusion plate 410 , the second diffusion plate 420 , the third diffusion plate 440 , and the fourth diffusion plate 450 may be changed as in the above-described various embodiments.

As described above, the diffusion plate according to another embodiment of the present invention includes the first diffusion plate 410, the second diffusion plate 420, the third diffusion plate 440, and the And by bonding the fourth diffusion plate 450 to manufacture, the overall size of the diffusion plate can be increased, and accordingly, a large-sized backlight unit and a liquid crystal display using the same can be realized.

8 is a schematic cross-sectional view of a liquid crystal display according to an exemplary embodiment.

As can be seen from FIG. 8 , the liquid crystal display according to an embodiment of the present invention includes a case 100 , a reflective plate 200 , a light source 300 , a diffuser plate 400 , an adhesive layer 600 , and a reflective sheet 700 . , a liquid crystal panel 800 , and an optical sheet 900 .

The case 100, the reflective plate 200, the light source 300, the diffuser plate 400, the adhesive layer 600, and the reflective sheet 700 show the backlight unit according to FIGS. 6A and 6B described above, Such a backlight unit may be changed to the above-described various embodiments, and a repeated description thereof will be omitted.

The liquid crystal panel 800 is positioned above the backlight unit to display an image.

The liquid crystal panel 800 may include a lower substrate 810 , an upper substrate 820 , a lower polarizing plate 830 , and an upper polarizing plate 840 .

Although not shown, a liquid crystal layer is sealed with a sealant between the lower substrate 810 and the upper substrate 820 .

In addition, on the upper surface of the lower substrate 810, a gate line and a data line are formed to cross each other to define a pixel area, and a thin film transistor as a switching element is formed in a region where the gate line and the data line cross each other, and the A pixel electrode connected to the thin film transistor may be formed in each pixel area.

In addition, a light blocking layer for preventing light leakage is formed in a matrix structure on the lower surface of the upper substrate 820 , and red, green, and blue color filter layers are formed between the light blocking layers, and on the color filter layer An overcoat layer may be formed thereon.

A specific configuration of the lower substrate 810 and the upper substrate 820 includes a driving mode of the liquid crystal layer, for example, a twisted nematic (TN) mode, a vertical alignment (VA) mode, an in plane switching (IPS) mode, and an FFS. According to (Fringe field switching) mode, etc., it may be changed and formed in various forms known in the art.

The lower polarizing plate 830 is formed on the lower surface of the lower substrate 810 , and the upper polarizing plate 840 is formed on the upper surface of the upper substrate 820 . The lower polarizing plate 830 and the upper polarizing plate 840 may have a structure in which optical axes are identical to each other or may have a structure in which optical axes are orthogonal to each other.

The liquid crystal panel 800 as described above may be changed into various forms known in the art.

The optical sheet 900 is formed between the liquid crystal panel 800 and the diffuser plate 400 of the backlight unit to improve characteristics of light incident to the liquid crystal panel 800 through the diffuser plate 400 . . For example, the optical sheet 900 may be formed of a plurality of prism sheets, but is not limited thereto, and may include various sheets known in the art.

The above has been described with respect to the direct backlight in which the light source 300 is disposed on the entire lower surface of the liquid crystal panel 800 , but the present invention is not necessarily limited thereto. It also includes an edge-type backlight that is disposed in the light source 300 and transmits the light emitted from the light source 300 toward the liquid crystal panel 800 through the light guide plate.

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 within the scope without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit 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 not restrictive. The protection scope of the present invention should be construed by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: case 200: reflector
300: light source 400: diffuser plate
410: first diffusion plate 415: first diffusion pattern
420: second diffusion plate 425: second diffusion pattern
430: adhesive member 500: support member
600: adhesive layer 700: reflective sheet
710: transmitting unit 720: reflecting unit
800: liquid crystal panel 900: optical sheet

Claims (14)

a first diffusion plate having an upper surface, a lower surface, and a side surface;
a second diffusion plate having an upper surface, a lower surface, and a side surface;
an adhesive member provided between a side surface of the first diffusion plate and a side surface of the second diffusion plate;
a first diffusion pattern provided on a lower surface of the first diffusion plate adjacent to the adhesive member with respect to a center line of the first diffusion plate; and
a diffusion plate comprising a second diffusion pattern provided on a lower surface of the second diffusion plate adjacent to the adhesive member with respect to a center line of the second diffusion plate. According to claim 1,
The surface uniformity of the side surface of the first diffusion plate is better than the surface uniformity of upper and lower surfaces of the first diffusion plate. delete According to claim 1,
A diffusion plate further comprising a reflective sheet provided on a lower surface of the first diffusion pattern and a lower surface of the second diffusion pattern. 5. The method of claim 4,
The reflective sheet is a diffuser plate having a transmissive portion through which light can pass. a plurality of light sources; and
and a diffusion plate for diffusing the light emitted from the plurality of light sources,
The diffusion plate is a backlight unit formed of the diffusion plate according to any one of claims 1, 2, 4, or 5. 7. The method of claim 6,
The plurality of light sources is arranged in a plurality of columns, and the plurality of light sources includes a plurality of light sources arranged in a column facing the adhesive member. 8. The method of claim 7,
The distance between the light sources disposed in the row facing the adhesive member is smaller than the distance between the light sources disposed in any one row not facing the adhesive member. 8. The method of claim 7,
A distance between a row facing the adhesive member and a row adjacent to the adhesive member is smaller than a distance between any other two adjacent rows. 7. The method of claim 6,
Further comprising a plurality of support members arranged in a plurality of rows while supporting the lower surface of the diffusion plate,
The distance between the support members disposed in any one row positioned close to the adhesive member is smaller than the distance between the support members disposed in any one row positioned far from the adhesive member. 7. The method of claim 6,
Further comprising a plurality of support members arranged in a plurality of rows while supporting the lower surface of the diffusion plate,
A distance between two rows closest to the adhesive member is smaller than a distance between any other two adjacent rows. backlight unit; and
and a liquid crystal panel positioned above the backlight unit,
The backlight unit is a liquid crystal display including the backlight unit according to claim 6 . 6. The method of claim 5,
The reflective sheet is a diffusion plate formed only in a region adjacent to the adhesive member to overlap the first diffusion pattern and the second diffusion pattern. 14. The method of claim 13,
The transmission portion is a diffusion plate that does not overlap the first diffusion pattern and the second diffusion pattern.

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