KR102147253B1 - Light guide panel, backlight unit and liquid crystal display comprising the same - Google Patents

Abstract

A light guide plate, a backlight unit, and a liquid crystal display device including the same are provided. The light guide plate according to an embodiment of the present invention includes an upper surface, a lower surface disposed opposite to the upper surface, and a first side and a second side disposed opposite to each other between the upper surface and the lower surface, wherein the lower surface protrudes from the reference surface and the reference surface. Alternatively, a plurality of scattering patterns formed by being recessed may be included, and the scattering pattern includes a first inclined surface having a first angle with the reference surface and a second inclined surface having one end in contact with the first inclined surface and forming a second angle with the reference surface.

Description

A light guide plate, a backlight unit, and a liquid crystal display device including the same {LIGHT GUIDE PANEL, BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY COMPRISING THE SAME}

The present invention relates to a light guide plate, a backlight unit, and a liquid crystal display device including the same, and more particularly, to a light guide plate, a backlight unit, and a liquid crystal display device including the same to induce front light emission.

The liquid crystal display device includes a liquid crystal display module connected to an external case. The liquid crystal display module includes a liquid crystal panel including two substrates interposed between a liquid crystal layer and a backlight unit positioned behind the liquid crystal panel to supply light to the liquid crystal layer. The liquid crystal panel displays an image by adjusting the transmittance of light provided from the backlight unit.

The backlight unit is divided into two types: a direct type type and a light meter type type according to the location of the light source. In the direct type method, the light source is provided at the rear of the display panel, and in the photometric type, the light source is provided at the rear side of the display panel.

In the case of a photometric backlight unit, a light guide plate for guiding the light emitted from the light source toward the display panel is required. The light guide plate guides the light to the display panel by changing a path of light. In such a liquid crystal display device, it is an important issue to focus light emitted in various directions and guide it toward the front, that is, a display panel, and accordingly, various technical attempts to improve the front emission luminance are being conducted. .

The problem to be solved by the present invention is to provide a light guide plate having an excellent front exit luminance.

Another problem to be solved by the present invention is to provide a backlight unit having excellent front emission luminance.

Another problem to be solved by the present invention is to provide a liquid crystal display device having excellent front emission luminance.

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

The light guide plate according to an embodiment of the present invention for solving the above problems includes an upper surface including a first side extending in the x-axis direction and a second side extending in the y-axis direction, a lower surface disposed opposite to the upper surface, and It includes a first side surface and a second side surface disposed opposite to each other between the lower surface, the lower surface includes a reference surface and a plurality of scattering patterns protruding or depressed from the reference surface, and the scattering pattern is a first The inclined surface and one end includes a second inclined surface in contact with the first inclined surface and forming a second angle with the reference surface.

The backlight unit according to an embodiment of the present invention for solving the above problems includes an upper surface including a first side extending in the x-axis direction and a second side extending in the y-axis direction, a lower surface disposed opposite to the upper surface, and the upper surface. It includes a first side and a second side that are disposed to be opposed to each other between the lower surface and the lower surface includes a reference surface and a plurality of scattering patterns formed by protruding or depressing from the reference surface, and the scattering pattern is 1 A light guide plate having an inclined surface and a second inclined surface having one end in contact with the first inclined surface and forming a second angle with the reference surface, a light source unit disposed adjacent to one side of the light guide plate, a plurality of light guides disposed on the upper surface of the light guide plate And a prism sheet provided with a prism.

A liquid crystal display device according to an embodiment of the present invention for solving the above problem includes a backlight unit and a display panel disposed on the backlight unit, wherein the backlight unit includes a first side extending in an x-axis direction and a y-axis direction. Includes an upper surface including a second side extending, a lower surface disposed opposite to the upper surface, and a first side and a second side disposed opposite to each other between the upper surface and the lower surface, wherein the lower surface is formed by protruding or depressing from the reference surface and the reference surface. Includes a plurality of scattering patterns, and the scattering pattern is a light guide plate including a first inclined surface forming a first angle with the reference surface and a second inclined surface having one end contacting the first inclined surface and forming a second angle with the reference surface, adjacent to one side of the light guide plate And a prism sheet disposed on the light guide plate and having a plurality of prisms facing the upper surface of the light guide plate.

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

According to the embodiments of the present invention, there are at least the following effects.

That is, the light irradiated by the light source unit may be guided toward the front of the display device, thereby improving front emission luminance.

In addition, it is possible to provide a backlight unit and a liquid crystal display device with improved front emission 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 specification.

1 is a perspective view of a light guide plate according to an embodiment of the present invention.
2 is a cross-sectional view of the light guide plate of FIG. 1.
3 is a bottom view of the light guide plate of FIG. 1.
4 is a partially enlarged view of the scattering pattern 300 of FIG. 1.
5 is a cross-sectional view of FIG. 4 taken along the line I-I'.
6 is a graph showing the relationship between the first angle β and the light concentration.
7 is a graph showing the relationship between the first angle β and the total flux.
8 is a graph showing the relationship between the first angle β and the front emission luminance.
9 is a cross-sectional view of the light guide plate of FIG. 1.
10 is a cross-sectional view of a scattering pattern according to a modified example of FIG. 5.
11 is a bottom view of a light guide plate according to another embodiment of the present invention.
12 is a partially enlarged view of the scattering pattern of FIG. 11. 13 is a cross-sectional view taken along line II-II' of FIG. 12.
14 is a cross-sectional view of a light guide plate scattering pattern according to a modified example of FIG. 13.
FIG. 15 is a cross-sectional view of a light guide plate scattering pattern boundary according to a modified example of FIG. 13 taken in a direction parallel to a y-axis direction.
16 is a perspective view of a light guide plate according to another embodiment of the present invention.
17 is a cross-sectional view of the light guide plate of FIG. 16. 18 is a bottom view of the light guide plate of FIG. 16.
19 is a partially enlarged view of the scattering pattern of FIG. 18.
20 is a cross-sectional view of the scattering pattern of FIG. 19 taken along line III-III'.
21 is a cross-sectional view of the light guide plate of FIG. 16.
22 is a bottom view of a light guide plate according to another embodiment of the present invention.
23 is a partially enlarged view of the scattering pattern 304 of FIG. 22.
24 is a cross-sectional view of the scattering pattern 304 of FIG. 23 taken along line IV-IV'.
25 is a cross-sectional view of a light guide plate scattering pattern according to a modified example of FIG. 24.
FIG. 26 is a cross-sectional view of a light guide plate scattering pattern boundary according to the modified example of FIG. 24 taken in a direction parallel to a y-axis direction.
27 is a perspective view of a backlight unit according to an embodiment of the present invention.
28 is a cross-sectional view of the backlight unit of FIG. 27.
29 is a cross-sectional view of the backlight unit of FIG. 27.
30 is a graph showing the relationship between the first and third angles and the front exit luminance.
31 is a cross-sectional view of a light guide plate according to the modified example of FIG. 29.
32 is a bottom view of a backlight unit according to another embodiment of the present invention.
33 is a bottom view of the backlight unit according to the modified example of FIG. 32.
34 is a bottom view of the backlight unit according to the modified example of FIG. 32.
35 is a bottom view of the backlight unit according to the modified example of FIG. 32.
36 is a partial perspective view of a backlight unit according to another embodiment of the present invention.
37 is a partial perspective view of a backlight unit according to another embodiment of the present invention.
38 is a perspective view of a backlight unit according to another embodiment of the present invention.
39 is a bottom view of the backlight unit of FIG. 38.
40 is a cross-sectional view taken along line V-V' of FIG. 39.
41 is a bottom view of the backlight unit according to the modified example of FIG. 39.
42 is a bottom view of the backlight unit according to the modified example of FIG. 41.
43 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

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 various forms different from each other, and only these 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 it, and the invention is only defined by the scope of the claims.

When an element or layer is referred to as “on” of 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. The same reference numerals refer to the same components throughout the specification.

Although the first, second, and the like are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are only used to distinguish one component from another component. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical idea of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view of a light guide plate according to an embodiment of the present invention. 2 is a cross-sectional view of the light guide plate of FIG. 1. 3 is a bottom view of the light guide plate of FIG. 1.

Referring to FIGS. 1 and 3 (120), a light guide plate 100 according to an embodiment of the present invention includes an upper surface 110 including a first side extending in the x-axis direction and a second side extending in the y-axis direction. ), a lower surface 120 disposed opposite to the upper surface 110, a first side 130 and a second side 140 disposed opposite to each other between the upper surface 110 and the lower surface 120, 120 includes a reference surface 1201 and a plurality of scattering patterns 300 formed by protruding or depressing from the reference surface 1201, and the scattering pattern includes a first inclined surface forming a first angle β with the reference surface 1201 ( 310) 310 and a second inclined surface 320 having one end in contact with the first inclined surface 310 and 310 and forming a second angle α with the reference surface 1201.

The upper surface 110 may be shaped to extend in a horizontal direction. 1 illustrates a case in which the upper surface 110 is a flat surface, but the shape of the upper surface 110 is not limited thereto, and a pattern having a specific shape is disposed on the upper surface 110, or at least partially an inclined surface Can be placed. A detailed description of this will be described later.

In an exemplary embodiment, the upper surface 110 may have a square shape. That is, the upper surface 110 may have four sides. In other words, the upper surface 110 may include a first side 110a extending in the x-axis direction and a second side 110b extending in the y-axis direction. In an exemplary embodiment, the second side 110b may be a tangent line in contact with the first side surface 130 to be described later.

The lower surface 120 is disposed to face the upper surface 110, and the shape of the lower surface 120 may be the same as the shape of the upper surface 110. That is, the upper surface 110 and the lower surface 120 are parallel to each other and extend in a horizontal direction, but have substantially the same shape and may face each other. In an exemplary embodiment, the upper surface 110 and the lower surface 120 may have a rectangular shape, but the shapes of the upper surface 110 and the lower surface 120 are not limited thereto.

The first side 130 and the second side 140 may be disposed between the upper surface 110 and the lower surface 120. Upper and lower ends of the first side 130 and the second side 140 may be in contact with both ends of the upper and lower surfaces 110 and 120. That is, the upper surface 110 and the lower surface 120 may be the bottom surface of the cube, and the first side 130 and the second side surface 140 may be two of the four side surfaces of the cube facing each other.

At least one of the first side 130 and the second side 140 may be disposed adjacent to the light source 220 to be described later. That is, it may be disposed to face one or more light source units 220. A detailed description of this will be described later.

1 illustrates a case where the thickness of the first side 130 and the second side 140 is substantially the same, but the thickness of the first side 130 and the thickness of the second side 140 may be different from each other. . In addition, FIG. 1 illustrates a case in which the first side 130 and the second side 140 are flat surfaces, but is not limited thereto, and the first side 130 and the second side 140 have a pattern of a specific shape. Can be formed. For example, an uneven pattern may be formed at least partially on the first side 130 or the second side 140.

The lower surface 120 may include a reference surface and at least one scattering pattern 300 formed by protruding or depressing from the reference surface.

The reference surface 1201 is a flat surface and may be a surface that serves as a reference for protrusion or depression.

At least one scattering pattern 300 may be provided on the lower surface 120. The scattering pattern 300 may be arranged in a plurality of matrix shapes, but is not limited thereto, and may be scattered and arranged in an irregular arrangement. In addition, the size of each scattering pattern 300 may be substantially the same, but is not limited thereto, and the scattering pattern 300 may have different sizes.

The scattering pattern 300 may be formed by protruding or depressing from the reference surface. That is, the scattering pattern 300 may be formed to protrude from the reference surface 1201 toward the lower side or may be formed by being recessed from the reference surface 1201 toward the upper surface, that is, toward the upper surface 110. A detailed description of the scattering pattern 300 will be described later.

The light guide plate 100 including the upper surface 110, the lower surface 120, the first side 130, and the second side 140 may be formed of a transparent material. In the present specification, the term “transparent” may be understood as a concept including a semi-transmissive property that completely passes light or a semi-transmissive property that partially passes light.

In order to have a transparent material, the light guide plate 100 may be made of, for example, polycarbonate (PC), polymethyl methacrylate (PMMA), or the like. However, this is exemplary, and the material of the light guide plate is not limited thereto.

In an exemplary embodiment, the light guide plate 100 may have flexibility. The flexibility of the light guide plate may be provided due to the thickness, shape, and material of the light guide plate, but is not limited thereto.

4 is a partially enlarged view of the scattering pattern 300 of FIG. 1. 5 is a cross-sectional view of FIG. 4 taken along the line I-I'.

4 and 5, the scattering pattern 300 may include a first inclined surface 310 and a second inclined surface 320. For convenience of explanation, a case where the scattering pattern 300 protrudes from the reference plane will be described first. A case in which the scattering pattern 300 is depressed from the reference plane will be described in detail later.

The scattering pattern 300 may include a first inclined surface 310 and a second inclined surface 320. The first inclined surface 310 and the second inclined surface 320 may be arranged to be aligned in the x-axis direction. That is, in each scattering pattern 300, the second inclined surface 320 may be disposed at a portion adjacent to the first side 130, and the first inclined surface 310 may be disposed at a portion adjacent to the second side 140. . That is, in the case of an exemplary embodiment in which the light source unit 200 is disposed adjacent to the first side 130, the second inclined surface 320 is disposed at a portion adjacent to the first side 130 in each scattering pattern 300 , The first inclined surface 310 may be disposed in a portion adjacent to the second side surface 140.

The first inclined surface 310 and the second inclined surface 320 may be formed to be inclined downward from the reference surface. That is, as shown in the cross-sectional view of FIG. 5, the first inclined surface 310 and the second inclined surface 320 are formed to be inclined downward from the reference surface, respectively, and the end of the first inclined surface 310 and the second inclined surface 320 The ends can be in contact with each other. That is, the boundary portion 330 where the end of the first inclined surface 310 and the end of the second inclined surface 320 meet may be formed. That is, when the scattering pattern 300 is cut along the line I-I', the cross-sectional shape may have a triangular shape. That is, the extension line of the reference plane, the first inclined surface 310 and the second inclined surface 320 may be one side of a triangle, respectively.

The first inclined surface 310 may form a first angle β with the reference surface, and the second inclined surface 320 may form a second angle α with the reference surface. That is, in the cross-sectional shape of FIG. 4, the first angle β and the second angle α may be two inner angles of a triangle.

In an exemplary embodiment, the first angle β may be smaller than the second angle α. Accordingly, the horizontal distance d1 of the first inclined surface 310 may be larger than the horizontal distance d2 of the second inclined surface 320.

In addition, in an exemplary embodiment, the first angle β may be 1.8 degrees to 5.7 degrees. Hereinafter, with reference to the experimental example, the effect when the first angle β has a range of 1.8 degrees to 5.7 degrees will be described.

6 is a graph showing the relationship between the first angle β and the light concentration. 7 is a graph showing the relationship between the first angle β and the total flux. 8 is a graph showing the relationship between the first angle β and the front emission luminance.

6 to 8, when the first angle β has a range of 1.8 to 5.7 degrees, the front outgoing luminance of light that passes through the upper surface 110 of the light guide plate and exits the light guide plate is at a first angle ( When β) has a value other than 1.8 degrees to 5.7 degrees, it can be remarkably superior. In another exemplary embodiment, the first angle β may be 3.3 degrees. When the first angle β is 3.3 degrees, the luminance of light that passes through the upper surface 110 of the light guide plate and exits to the upper surface of the light guide plate may be maximum. In other words, the smaller the first angle β, the larger the light concentration (see Fig. 6), and the smaller the first angle β, the smaller the total flux (see Fig. 7). The branch elements can bring about opposite effects in terms of front emission luminance. That is, the angle value of the most ideal first angle β, in which the two elements are properly harmonized, has an important meaning. In an exemplary experimental example, the first angle β is 1.8 degrees to 5.7 degrees, especially the first angle ( When β) is 3.3 degrees, the most ideal front exit luminance could be obtained.

The first inclined surface 310 and the second inclined surface 320 may have a square shape in a plan view. However, this is exemplary, and the planar shape of the first inclined surface 310 and the second inclined surface 320 may be circular, or may be at least partially curved. A detailed description of this will be described later.

6 is referred to to describe a path of light in the light guide plate according to an embodiment of the present invention.

9 is a cross-sectional view of the light guide plate of FIG. 1.

Referring to FIG. 9, light emitted from the light source unit 220 disposed adjacent to the first side surface 130 may be totally reflected inside the light guide plate 100 and then proceed toward the upper surface 110 of the light guide plate.

For convenience of explanation, any one of the myriad rays of light emitted from the light source unit 220 will be described as an example. One of the light rays emitted from the light source unit 220 may be irradiated to the upper surface 110 of the light guide plate. When the incident angle of light irradiated to the upper surface 110 of the light guide plate (the first incident angle θ1 in FIG. 9) is greater than the critical angle, total reflection may occur. In this case, the light may be reflected from the upper surface 110 of the light guide plate and proceed to the lower surface 120 of the light guide plate. Light traveling to the lower surface 120 of the light guide plate may reach the first inclined surface 310. The light hitting the first inclined surface 310 may be reflected and directed toward the upper surface 110 of the light guide plate again. The incident angle (the second incident angle θ2 in FIG. 9) of light reflected on the first inclined surface 310 may be smaller than the first incident angle θ1. In an exemplary embodiment, the second incident angle θ2 may be smaller than the critical angle, and light may pass through the upper surface 110 of the light guide plate and proceed to the top of the light guide plate.

In FIG. 9, a case where light passes through one total reflection, is reflected from the first inclined surface 310, and then proceeds to the upper portion of the light guide plate 100 is illustrated, but the path of the light is not limited thereto. That is, the light may proceed directly to the top of the light guide plate 100 without going through total reflection, or may go to the top of the light guide plate 100 through at least one total reflection. In addition, light passing through at least one total reflection may contact the first inclined surface 310 at least once or more. In addition, when the incident angle of light reflected from the first inclined surface 310 and traveling to the upper surface 110 of the light guide plate is greater than the critical angle, total reflection occurs again at the upper surface 110 of the light guide plate, and the above-described sequence may be repeated. In addition, in an exemplary embodiment, the light that has undergone a plurality of total reflections may be reflected from the second side surface 140 and proceed toward the upper surface 110 of the light guide plate or the lower surface 120 of the light guide plate.

Hereinafter, other embodiments of the present invention will be described. In the following embodiments, the same components as those previously described are referred to by the same reference numerals, and redundant descriptions will be omitted or simplified.

10 is a cross-sectional view of a scattering pattern according to a modified example of FIG. 5.

Referring to FIG. 10, the scattering pattern according to the modified example of the present invention differs from the embodiment of FIG. 5 in that the second angle α is substantially perpendicular.

In an exemplary embodiment, the second angle α may be a substantially right angle. However, even in this case, the first angle β may be the same as that of FIG. 5. As the second angle α is substantially perpendicular and the first angle β has the same angle as the embodiment of FIG. 5, the horizontal distance d1 of the first inclined surface 310 is The scattering pattern may be relatively larger than the horizontal distance d1 of the first inclined surface 310.

In addition, when the second angle α is substantially perpendicular, the horizontal distance of the second inclined surface 320a may be '0'. That is, the second inclined surface 320a may be a surface perpendicular to the reference surface 1201.

11 is a bottom view of a light guide plate according to another embodiment of the present invention.

Referring to FIG. 11, the light guide plate according to another embodiment of the present invention differs from the embodiment of FIG. 3 in that the planar shape of the scattering pattern 301 includes a curve.

The planar shape of the scattering pattern 301 may include a curve. In other words, the outer periphery of each scattering pattern 301 may at least partially include a curve. In an exemplary embodiment, each scattering pattern 301 may have an elliptical shape having a major axis and a minor axis. In this case, the major axis may extend in the x-axis direction, and the minor axis may extend in the y-axis direction.

12 to 13 are referred to for a detailed description of the scattering pattern 301.

12 is a partially enlarged view of the scattering pattern of FIG. 11. 13 is a cross-sectional view taken along line II-II' of FIG. 12.

Referring to FIG. 12, the elliptical scattering pattern 301 may include a first inclined surface 311 and a second inclined surface 321.

In each scattering pattern 301, the second inclined surface 321 is disposed at a portion adjacent to the first side 130, and the first inclined surface 311 is disposed at a portion adjacent to the second side 140. As described in Examples.

Referring to FIG. 13, the cross-sectional shape of the scattering pattern of FIG. 12 taken along the line II-II' may be substantially the same as the embodiment of FIG. 5.

In other words, a cross-sectional shape obtained by cutting the scattering pattern 301 of FIG. 12 in a direction parallel to the x-axis direction may have a triangular shape. In other words, the outer periphery of the first inclined surface 311 and the second inclined surface 321 may at least partially include a curved surface, but the first inclined surface 311 and the second inclined surface 321 may be formed of a flat surface rather than a curved surface. . Accordingly, the boundary 331 of the first inclined surface 311 and the second inclined surface 321, that is, the boundary 331 where the ends of the first inclined surface 311 and the second inclined surface 321 meet, is in the y-axis direction It can be a straight line parallel to

14 is a cross-sectional view of a light guide plate scattering pattern according to a modified example of FIG. 13.

Referring to FIG. 14, the first inclined surface 312 and the second inclined surface 322 may include a curved surface. That is, the cross-sectional shape obtained by cutting the scattering pattern 302 in a direction parallel to the x-axis may include a downwardly convex parabolic shape. That is, a part of the outer periphery of the cross-sectional shape may have a parabolic shape. In other words, the first inclined surface 312 and the second inclined surface 322 are inclined downward from the reference surface 1201, but may form a smooth curved surface. However, even in this case, the boundary 332 between the first inclined surface 312 and the second inclined surface 322 may be a straight line.

In this case, the first angle β passes through the contact point where the first inclined surface 312 and the reference surface 1201 in FIG. 14 are in contact, and the angle formed by the tangent line l1 in contact with the first inclined surface 312 and the reference surface 1201 Can be defined as Like the first angle β, the second angle α passes through the contact point where the second inclined surface 322 and the reference surface 1201 are in contact with each other, and the tangent line l2 and the reference surface in contact with the second inclined surface 322 This can be defined as the angle that makes up. In this case, as described above, the first angle β may have a value of 1.8 degrees to 5.7 degrees.

FIG. 15 is a cross-sectional view of a light guide plate scattering pattern boundary according to a modified example of FIG. 13 taken in a direction parallel to a y-axis direction.

In an exemplary embodiment, a cross-sectional shape obtained by cutting the boundary portion 332 of the first inclined surface 312 and the second inclined surface 322 of the light guide plate scattering pattern 302 in a direction parallel to the y-axis direction may be a downwardly convex parabolic shape. have.

In an exemplary embodiment, the scattering pattern may be formed including all the shapes of FIGS. 14 and 15. In other words, in an exemplary embodiment, the scattering pattern 302 may include a cross-sectional shape cut in the x-axis direction and a parabolic shape in which both the cross-sectional shape cut in the y-axis direction are convex downward. In other words, the scattering pattern 302 may have a shape obtained by cutting a three-dimensional ellipse along a horizontal plane including a major axis. In other words, the scattering pattern 302 may be a shape obtained by cutting a shape of a rugby ball along a plane including a long axis.

16 is a perspective view of a light guide plate according to another embodiment of the present invention. 17 is a cross-sectional view of the light guide plate of FIG. 16. 18 is a bottom view of the light guide plate of FIG. 16.

16 to 18, the light guide plate according to another exemplary embodiment of the present invention differs from the embodiment of FIGS. 1 and 3 in that the scattering pattern 303 is recessed from the reference surface 1201.

In the light guide plate according to another embodiment of the present invention, the scattering pattern may be formed by being recessed from the reference surface 1201 of the lower surface 120 toward the upper surface 110.

As described above, the reference surface 1201 is a flat surface and may be a surface that serves as a reference for protrusion or depression.

At least one scattering pattern 303 may be provided on the lower surface 120. The scattering patterns 303 may be arranged in a plurality of matrix shapes, but are not limited thereto, and may be scattered and arranged in an irregular arrangement. In addition, the size of each scattering pattern 303 may be substantially the same, but is not limited thereto, and the scattering patterns 303 may have different sizes.

The scattering pattern 303 may be formed by protruding or depressing from the reference surface 1201. Hereinafter, a case in which the scattering pattern 303 is recessed from the reference surface 1201 will be described.

19 and 20 are referred to for a detailed description of the shape of the scattering pattern 303.

FIG. 19 is a partially enlarged view of the scattering pattern of FIG. 18, and FIG. 20 is a cross-sectional view of the scattering pattern of FIG. 19 taken along line III-III'.

19 and 20, the scattering pattern may include a first inclined surface 313 and a second inclined surface 323.

The first inclined surface 313 and the second inclined surface 323 may be arranged and arranged along the x-axis direction. However, unlike the embodiments of FIGS. 4 and 5, in the embodiments of FIGS. 19 and 20, the first inclined surface 313 is disposed in a portion adjacent to the first side surface 130 in each scattering pattern 303, and the second A second inclined surface 323 may be disposed at a portion adjacent to the side surface 140. That is, in an exemplary embodiment in which the light source unit 220 is disposed adjacent to the first side surface 130, the first inclined surface 313 of each scattering pattern 303 is relatively compared to the second inclined surface 323. 220) can be placed closer.

The first inclined surface 313 and the second inclined surface 323 may be formed to be inclined upward from the reference surface 1201. That is, as shown in the cross-sectional view of FIG. 20, the first inclined surface 313 and the second inclined surface 323 are formed to be inclined upward from the reference surface 1201, respectively, and the end of the first inclined surface 313 and the second inclined surface ( The ends of the 323 may be in contact with each other. That is, the boundary portion 333 where the end of the first inclined surface 313 and the end of the second inclined surface 323 meet may be formed.

That is, when the scattering pattern 303 is cut along the line III-III', the cross-sectional shape may have a triangular shape. That is, the extension line of the reference surface 101, the first inclined surface 313, and the second inclined surface 323 may be one side of a triangle, respectively.

The first inclined surface 313 may form a first angle β with the reference surface 1201, and the second inclined surface 323 may form a second angle α with the reference surface. That is, in FIG. 20, the first angle β and the second angle α may be two inner angles of a triangle.

In an exemplary embodiment, the first angle β may be smaller than the second angle α. Accordingly, the horizontal distance d3 of the first inclined surface may be larger than the horizontal distance d4 of the second inclined surface.

In addition, in an exemplary embodiment, the first angle β may be 1.8 degrees to 5.7 degrees. When the first angle β has a range of 1.8 degrees to 5.7 degrees, the superiority of the front exit luminance when having different values is as described in FIGS. 6 to 8. The second angle α may be an acute angle, but is not limited thereto. In an exemplary embodiment, the second angle α may be a right angle.

The first inclined surface 313 and the second inclined surface 323 may have a square shape in a plan view. However, this is exemplary, and the planar shapes of the first inclined surface 313 and the second inclined surface 323 may be circular, or may be at least partially curved. A detailed description of this will be described later.

21 is referred to to describe a path of light in a light guide plate according to another embodiment of the present invention.

21 is a cross-sectional view of the light guide plate of FIG. 16.

Referring to FIG. 21, light emitted from the light source unit 220 disposed adjacent to the first side surface 130 may be totally reflected inside the light guide plate and then proceed toward the upper surface 110 of the light guide plate.

For convenience of explanation, any one of the myriad rays of light emitted from the light source unit 220 will be described as an example. One of the light rays emitted from the light source unit 220 may be irradiated to the upper surface 110 of the light guide plate. When the incident angle of light irradiated to the upper surface 110 of the light guide plate (the first incident angle θ1 in FIG. 21) is greater than the critical angle, total reflection may occur. The light is reflected from the upper surface 110 of the light guide plate, and the lower surface of the light guide plate ( 120). Light traveling to the lower surface 120 of the light guide plate may reach the first inclined surface 313. The light hitting the first inclined surface 313 may be reflected and directed toward the upper surface 110 of the light guide plate again. The incident angle of light reflected on the first inclined surface 313 (the second incident angle θ2 in FIG. 21) may be smaller than the first incident angle θ1. In an exemplary embodiment, the second incident angle θ2 may be smaller than the critical angle, and light may pass through the upper surface 110 of the light guide plate and proceed to the top of the light guide plate.

21 illustrates a case where light passes through a single total reflection, is reflected from the first inclined surface 313, and then proceeds to the upper portion of the light guide plate, but the path of light is not limited thereto. That is, the light may proceed directly to the top of the light guide plate without going through total reflection, or may go to the top of the light guide plate through at least one total reflection. In addition, light that has passed through at least one total reflection may contact the first inclined surface 313 at least once or more. In addition, when the incident angle of light reflected from the first inclined surface 313 and traveling to the upper surface 110 of the light guide plate is greater than the critical angle, total reflection occurs again at the upper surface 110 of the light guide plate, and the above-described sequence may be repeated. In addition, in an exemplary embodiment, light that has undergone a plurality of total reflections may be reflected from the second side surface 140 and may travel toward the upper surface 110 of the light guide plate or the lower surface 120 of the light guide plate.

That is, the path through which light emitted from the light source unit 220 moves in the light guide plate may be substantially the same as described in the embodiment of FIG. 6.

22 is a bottom view of a light guide plate according to another embodiment of the present invention.

Referring to FIG. 22, the light guide plate according to another embodiment of the present invention differs from the embodiment of FIG. 18 in that the plane shape of the scattering pattern 304 includes a curve.

The planar shape of the scattering pattern 304 may include a curve. In other words, the outer periphery of each scattering pattern 304 may at least partially include a curve. In an exemplary embodiment, each scattering pattern 304 may have an elliptical shape having a major axis and a minor axis. In this case, the major axis may be parallel to the x-axis direction, and the minor axis may be parallel to the y-axis direction.

23 and 24 are referred to for a detailed description of the scattering pattern 304.

23 is a partially enlarged view of the scattering pattern 304 of FIG. 22. 24 is a cross-sectional view of the scattering pattern 304 of FIG. 23 taken along line IV-IV'.

Referring to FIG. 23, the elliptical scattering pattern 304 may include a first inclined surface 314 and a second inclined surface 324.

In each scattering pattern 304, the first inclined surface 314 is disposed at a portion adjacent to the first side 130, and the second inclined surface 324 is disposed at a portion adjacent to the second side 140. As described.

Referring to FIG. 24, a cross-sectional shape of the scattering pattern 304 of FIG. 23 taken along the line IV-IV' may be substantially the same as the embodiment of FIG. 20.

In other words, a cross-sectional shape obtained by cutting the scattering pattern 304 of FIG. 24 in a direction parallel to the x-axis direction may have a triangular shape. In other words, the outer periphery of the first inclined surface 314 and the second inclined surface 324 may at least partially include a curved surface, but the first inclined surface 314 and the second inclined surface 324 may be formed of a flat surface rather than a curved surface. . Accordingly, the boundary between the first inclined surface 314 and the second inclined surface 324, that is, the boundary where the ends of the first inclined surface 314 and the second inclined surface 324 meet may be a straight line parallel to the y-axis direction.

25 is a cross-sectional view of a light guide plate scattering pattern according to a modified example of FIG. 24.

Referring to FIG. 25, the first inclined surface 315 and the second inclined surface 325 may include curved surfaces.

That is, a cross-sectional shape obtained by cutting the scattering pattern in a direction parallel to the x-axis may have a parabolic shape convex upward. That is, the first inclined surface 315 and the second inclined surface 325 are inclined upward from the reference surface 1201, but may form a smooth curved surface. However, even in this case, the boundary 334 between the first inclined surface 315 and the second inclined surface 325 may be a straight line.

In this case, the first angle β is the angle formed by the tangent line l3 and the reference surface 1201 in contact with the first inclined surface 315 and the reference surface 1201 passing through the contact point in contact with the first inclined surface 315 and the reference surface 1201 in FIG. Can be defined. Like the first angle β, the second angle α passes through the contact point where the second inclined surface 325 and the reference surface 1201 are in contact with each other, and the tangent line l4 and the reference surface in contact with the second inclined surface 325 It can be defined as the angle formed by (1201). In this case, as described above, the first angle β may have a value of 1.8 degrees to 5.7 degrees.

26 is a cross-sectional view of a light guide plate scattering pattern boundary portion 334 according to the modified example of FIG. 24 cut in a direction parallel to the y-axis direction.

In an exemplary embodiment, a cross-sectional shape obtained by cutting the boundary 334 between the first inclined surface 315 and the second inclined surface 325 of the light guide plate scattering pattern in a direction parallel to the y-axis direction may be a downwardly convex parabolic shape.

In an exemplary embodiment, the scattering pattern may be formed including all of the shapes of FIGS. 25 and 26. In other words, in the exemplary embodiment, the scattering pattern may have a parabolic shape in which both a cross-sectional shape cut in the x-axis direction and a cross-sectional shape cut in the y-axis direction are convex upward. In other words, the scattering pattern may be a shape obtained by cutting a three-dimensional ellipse along a horizontal plane including a major axis. In other words, the scattering pattern may be a shape obtained by cutting a shape of a rugby ball along a plane including a long axis.

27 is a perspective view of a backlight unit according to an embodiment of the present invention. 28 is a cross-sectional view of the backlight unit of FIG. 27.

Referring to FIGS. 27 and 28, the backlight unit according to an exemplary embodiment of the present invention includes an upper surface 110 and an upper surface 110 including a first side extending in the x-axis direction and a second side extending in the y-axis direction. ) And a lower surface 120 disposed opposite to each other, a first side 130 and a second side 140 disposed opposite to each other between the upper surface 110 and the lower surface 120, but the lower surface 120 is a reference surface 1201 and a plurality of scattering patterns 300 formed by protruding or depressing from the reference surface 1201, and the scattering pattern 300 has a first inclined surface and one end forming a first angle β with the reference surface 1201 The light guide plate 100 including a second inclined surface in contact with the first inclined surface and forming a second angle α with the reference surface 1201, a light source unit 220 disposed adjacent to the first side 130 of the light guide plate 100, It is disposed on the upper portion of the light guide plate 100 and includes a prism sheet 400 having a plurality of prisms 410 facing the upper surface 110 of the light guide plate 100.

The light guide plate 100 may be substantially the same as the light guide plate 100 according to some embodiments of the present invention. Therefore, a detailed description thereof will be omitted.

The light source unit 220 may be disposed adjacent to the first side surface 130 of the light guide plate 100. The light source unit 220 may include a base 220 extending in the y-axis direction and at least one light source disposed on one side of the base 220.

The base 220 serves to support at least one or more light sources, and may have a bar shape extending in the y-axis direction. In an exemplary embodiment, a sidewall may be formed on one side of the base 220 to at least partially surround the side of the light source.

At least one light source may be provided on one side of the base 220, that is, on a surface facing the first side 130 of the light guide plate 100. The light source may be a light emitting diode (LED), but this is only an example, and the type of the light source is not limited thereto.

In an exemplary embodiment, a plurality of light sources may be disposed at predetermined intervals along the y-axis direction.

A prism sheet 400 may be disposed on the light guide plate 100. Specifically, the prism sheet 400 may be disposed in contact with the upper surface 110 of the light guide plate 100 or spaced apart from the upper surface 110 of the light guide plate 100 by a predetermined distance.

The prism sheet 400 may include a plurality of prisms 410. The plurality of prisms 410 may be disposed along the x-axis direction, and each prism 410 may extend along the y-axis direction. That is, a plurality of bar-shaped prisms 410 may be disposed in a direction parallel to the y-axis.

Each prism 410 may have a mountain portion. The peak of the prism 410 may be disposed to face the upper surface 110 of the light guide plate 100. That is, as shown in FIG. 28, the cross section of the prism 410 cut in the x-axis direction has a triangular shape, and the peak of the prism 410 is the triangle closest to the upper surface 110 of the light guide plate 100 It can mean near a vertex.

Referring to FIG. 29 to describe a movement path of light irradiated from the light source unit 220 in the backlight unit according to an embodiment of the present invention.

29 is a cross-sectional view of the backlight unit of FIG. 27.

Referring to FIG. 29, light emitted from the light source unit 220 disposed adjacent to the first side surface 130 is totally reflected inside the light guide plate 100, then passes through the upper surface 110 of the light guide plate 100, and passes through the upper surface of the light guide plate 100. You can proceed with

For convenience of explanation, any one of the myriad rays of light emitted from the light source unit 220 will be described as an example. Any one of the light rays emitted from the light source unit 220 may be irradiated toward the upper surface 110 of the light guide plate 100. When the incident angle of light irradiated to the upper surface 110 of the light guide plate 100 (the first incident angle in FIG. 29) is greater than the critical angle, total reflection may occur. In this case, the light may be reflected from the upper surface 110 of the light guide plate 100 and may proceed to the lower surface 120 of the light guide plate 100. Light traveling to the lower surface 120 of the light guide plate 100 may reach the first inclined surface. The light hitting the first inclined surface may be reflected and directed toward the upper surface 110 of the light guide plate 100 again. The incident angle of light reflected on the first inclined surface (the second incident angle in FIG. 29) may be smaller than the first incident angle. In an exemplary embodiment, the second incident angle may be smaller than the critical angle, and light may pass through the upper surface 110 of the light guide plate 100 and proceed to the upper portion of the light guide plate 100.

When the second incident angle is smaller than the critical angle, the light transmitted through the upper surface 110 of the light guide plate 100 has a third refraction angle θ3 and may travel toward the prism sheet 400. Light having a third refraction angle θ3 passes through one side of any one prism 410 and is reflected from the other side of the prism 410, and is directed toward the front side, that is, the upper part of the prism sheet 400. You can proceed.

In more detail 120, the light from the upper surface 110 of the light guide plate 100 may follow the following equation.

Equation 1

Here, θi may be an incidence angle, n2 may be a refractive index of the light guide plate 100, and n3 may be a refractive index of the prism sheet 400. In addition, γ may be a third angle (γ). That is, according to the above equation, an optimal first angle β according to a specific incident angle can be calculated. According to the experimental example (refer to FIG. 30) performed based on this equation, when the first angle (β) is about 3.3 degrees and the third angle (γ) is about 65 degrees, the backlight unit is It can be seen that it has an outgoing light intensity value. In addition, when the first angle β is about 2.3 degrees and the third angle γ is about 68 degrees, it can be seen that the backlight unit has the second largest front luminance value. That is, in the above two cases, the effect of having a remarkably superior front luminance was exhibited compared to the case where the first angle β has different values.

31 is a cross-sectional view of a light guide plate according to the modified example of FIG. 29.

Referring to FIG. 31, the scattering pattern 303 of the light guide plate is depressed from the reference surface 1201 toward the upper surface 110 in that it is different from the embodiment of FIG. 29.

As described above, the scattering pattern 303 may be formed to be recessed from the reference surface 1201 of the lower surface 120 of the light guide plate toward the upper surface 110. In addition, when the scattering pattern 303 is recessed, the light path in the light guide plate may be substantially the same as in the embodiment of FIG. 29. That is, light that is totally reflected from the upper surface of the light guide plate 110 and directed toward the lower surface 120 of the light guide plate reaches the first inclined surface 313 and is reflected, and when the incident angle of the reflected light is greater than the critical angle, it passes through the upper surface of the light guide plate 110 , Proceeding toward the prism sheet 400 disposed on the light guide plate, and the proceeding light passes through one side of one prism 410 and is reflected from the other side of the prism 410, and is It can proceed toward the top of the sheet 400.

32 is a bottom view of a backlight unit according to another embodiment of the present invention.

Referring to FIG. 32, in the scattering pattern 301 of the light guide plate of the backlight unit according to another exemplary embodiment of the present invention, the density of the scattering pattern 301 may increase as the distance from the light source unit 220 increases.

As described above, the scattering patterns 301 on the lower surface of the light guide plate 120 may be regularly or irregularly arranged. Further, as described above, the plurality of scattering patterns 301 may be arranged in a matrix form having a plurality of columns and a plurality of rows. In an exemplary embodiment, the plurality of scattering patterns 301 may be disposed more farther from the light source unit 220. In other words, as the distance from the light source unit 220 increases, the density of the scattering pattern 301 may increase. That is, as the distance from the light source 220 increases, the number of scattering patterns 301 per unit area may increase. In other words, from the lower surface of the light guide plate 120 to the positive x-axis direction, the number of scattering patterns 301 per unit area may increase.

33 is a bottom view of the backlight unit according to the modified example of FIG. 32.

Referring to FIG. 33, the scattering pattern 301 of the light guide plate of the backlight unit according to the modified example of FIG. 32 is irregularly arranged in a point different from FIG. As described above, the scattering patterns 301 of the light guide plate may be irregularly arranged. However, even in this case, the number of scattering patterns 301 per unit area may increase in a direction away from the first side surface 130 or the light source unit 220 from the lower surface 120 of the light guide plate, that is, in the positive x-axis direction. .

34 is a bottom view of the backlight unit according to the modified example of FIG. 32.

Referring to FIG. 34, the scattering patterns 301 of the backlight unit light guide plate according to the modified example of FIG. 34 are different from the embodiment of FIG. 32 in that their respective sizes are different.

In the backlight unit according to another embodiment of the present invention, the size of the scattering pattern 301 may be different.

In an exemplary embodiment, the size of the scattering pattern 301 may increase toward a positive x-axis direction. In other words, the size of the scattering pattern 301 may increase from the lower surface 120 of the light guide plate toward a direction away from the first side surface 130 or the light source unit 220. That is, the ratio of the area occupied by the scattering pattern 301 per unit area may increase from the lower surface 120 of the light guide plate in the positive x-axis direction.

35 is a bottom view of the backlight unit according to the modified example of FIG. 32.

The scattering pattern 301 of the light guide plate of the backlight unit according to the modified example of FIG. 35 is adjacent to the first center line c1 crossing the center of the lower surface 120 of the light guide plate in a direction parallel to the x-axis. The difference from FIG. 32 is that the number increases.

A first center line c1 crossing the central portion of the lower surface 120 of the light guide plate may be defined. The first center line c1 may cross the central portion of the lower surface 120 of the light guide plate in a direction parallel to the x-axis. The number of scattering patterns 301 on the lower surface of the light guide plate 120 may increase as it approaches the center line. That is, the number of scattering patterns 301 per unit area may increase from the third side and the fourth side perpendicular to the first side 130 and the second side 140 of the light guide plate toward the center of the lower surface 120 of the light guide plate. .

36 is a partial perspective view of a backlight unit according to another embodiment of the present invention.

Referring to FIG. 36, the upper surface 110 of the light guide plate of the backlight unit according to another embodiment of the present invention is different from the embodiment of FIG. 27 in that it includes an inclined surface.

In an exemplary embodiment, the upper surface 110 of the light guide plate may include an inclined surface. In more detail 120, the upper surface 110 of the light guide plate is a first flat surface 111a extending in a horizontal direction from the upper end of the first side 130, and downward from the end of the first flat surface 111a. It may include an inclined inclined surface 111b and a second flat surface 111c extending in a horizontal direction from an end of the inclined surface 111b.

The end of the second flat surface 111c may contact the upper end of the second side surface 140. In an exemplary embodiment in which the upper surface 110 of the light guide plate includes an inclined surface, the thickness of the first side surface 130 and the thickness of the second side surface 140 may be different. That is, the thickness of the first side 130 may be relatively larger than the thickness of the second side 140.

37 is a partial perspective view of a backlight unit according to another embodiment of the present invention.

Referring to FIG. 37, a difference from the embodiment of FIG. 27 is that a plurality of diffusion patterns 112a are formed on the upper surface 112 of the backlight unit light guide plate according to another exemplary embodiment of the present invention.

In an exemplary embodiment, a plurality of diffusion patterns 112a may be formed on the upper surface 112 of the light guide plate. In an exemplary embodiment, a plurality of diffusion patterns 112a are disposed along the x-axis direction, and each diffusion pattern 112a may extend along the y-axis direction. That is, each diffusion pattern 112a may have a bar shape extending along the y-axis direction. 37 illustrates a case in which the cross-sectional shape of each diffusion pattern 112a is a semicircular shape, but this is illustrative and is not limited thereto, and the cross-sectional shape of the diffusion pattern 112a may be a polygonal shape.

38 is a perspective view of a backlight unit according to another embodiment of the present invention. 39 is a bottom view of the backlight unit of FIG. 38. 40 is a cross-sectional view taken along line V-V' of FIG. 39.

38 to 40, the backlight unit according to another exemplary embodiment of the present invention is different from the exemplary embodiment of FIG. 27 in that it further includes a second light source unit 221 adjacent to the second side surface 140.

A backlight unit according to another embodiment of the present invention may include two light source units 220. That is, the first light source unit 220 may be disposed adjacent to the first side surface 130, and the second light source unit 221 may be disposed adjacent to the second side surface 140.

The second light source unit 221 may include a base 220 and at least one light source formed on one side of the base 220. Since the second light source unit 221 may be substantially the same as the first light source unit 220 described above, a detailed description thereof will be omitted.

In an exemplary embodiment in which the backlight unit includes two light source units 220, the scattering patterns 305 on the lower surface 120 of the light guide plate may have a shape symmetrical to each other.

In more detail 120, the first angle β and the second angle α formed by the first inclined surface 316 and the second inclined surface 326 with the reference surface may be substantially the same. That is, the horizontal distance d5 of the first inclined surface 316 and the horizontal distance d6 of the second inclined surface 326 may be substantially the same. That is, as illustrated in FIG. 40, a figure formed by the extension line of the first inclined surface 316, the second inclined surface 326, and the reference surface 1201 may be an isosceles triangle.

41 is a bottom view of the backlight unit according to the modified example of FIG. 39.

Referring to FIG. 41, the lower surface 120 of the light guide plate of the backlight unit according to the modified example of FIG. 39 is divided into a first region 127 and a second region 128 by a second center line. The difference is.

A second center line c2 is defined that passes through the central portion of the light guide plate in a direction parallel to the y-axis direction, and divides the lower surface 120 of the light guide plate. That is, the lower surface 120 of the light guide plate may be divided into a first region 127 and a second region 128 by the second center line c2.

The scattering pattern 307 disposed in the first area 127 and the scattering pattern 308 disposed in the second area 128 may be disposed in opposite directions to each other. That is, the scattering pattern 307 disposed in the first region 127 may be a mirror image of the scattering pattern 308 disposed in the second region 128.

In an exemplary embodiment, each scattering pattern 307 disposed in the first region 127 has a second inclined surface disposed at a portion adjacent to the first side 130, and a first inclined surface disposed at a portion adjacent to the second center line c1 Inclined surfaces can be arranged. However, this exemplifies a case of a scattering pattern protruding from the reference surface 1201, and positions of the first and second inclined surfaces may be changed in the case of the recessed scattering pattern.

In the scattering pattern 308 disposed in the second area 128 to correspond to this, a second inclined surface is disposed in a portion adjacent to the second side 140 and a first inclined surface is disposed in a portion adjacent to the second center line c2 Can be. That is, the first inclined surface and the second inclined surface may be disposed in a direction opposite to the scattering pattern 307 disposed in the first area.

42 is a bottom view of the backlight unit according to the modified example of FIG. 41.

Referring to FIG. 42, in the scattering patterns 307 and 308 of the backlight unit according to the modified example of FIG. 41, the number of scattering patterns 307 and 308 per unit area increases as they are adjacent to the second center line c2. It is different from

As described above, the density of the scattering patterns 307 and 308 may be different from each other in each portion of the lower surface 120 of the light guide plate. In an exemplary embodiment, the density of the scattering patterns 307 and 308 may increase from the first side 130 and the second side 140 toward the second center line. That is, the number of scattering patterns 307 and 308 per unit area may increase from the first side 130 to the second center line and from the second side 140 to the second center line.

43 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention. Referring to FIG. 43, a liquid crystal display according to an embodiment of the present invention includes a backlight unit and a display panel disposed on the backlight unit, wherein the backlight unit includes a first side extending in an x-axis direction and a y-axis direction. The upper surface 110 including the extending second side, the lower surface 120 disposed opposite to the upper surface 110, the first side 130 disposed opposite to each other between the upper surface 110 and the lower surface 120, and Including a second side surface 140, the lower surface 120 includes a reference surface 1201 and a plurality of scattering patterns 300 formed by protruding or depressing from the reference surface 1201, and the scattering pattern 300 is a reference surface 1201 ) And a first inclined surface 310 forming a first angle β, and a second inclined surface 320 having one end in contact with the first inclined surface 310 and forming a second angle α with the reference surface 1201 (100), a light source unit 220 disposed adjacent to one side of the light guide plate 100, a prism sheet 400 disposed above the light guide plate 100, and having a plurality of prisms facing the upper surface of the light guide plate 110 Includes.

The backlight unit may be substantially the same as the backlight unit according to some exemplary embodiments described above. Therefore, a detailed description thereof will be omitted.

The liquid crystal display device 1000 according to the exemplary embodiment may further include a display panel 160, a top chassis 150, and a bottom chassis 152. A detailed description of a liquid crystal display device 1000 according to an exemplary embodiment of the present invention will be given below.

The display panel 160 includes a display area and a non-display area. In addition, the display panel 160 includes a first substrate 162, a second substrate 161 facing the first substrate, a liquid crystal layer (not shown), and a driving unit 164 attached to the first substrate 162. A printed circuit board 167 may be included.

The display area of the display panel 160 may mean an area in which an image is displayed, and the non-display area of the display panel 160 may mean an area in which an image is not displayed. In an exemplary embodiment, the display area may be located at a central portion of an area where the first substrate 162 and the second substrate 161 overlap, and the non-display area is the first substrate 162 and the second substrate ( 161) may be located at the edge of the overlapping region. Also, the display area may be an area where the display panel 160 and the top chassis 150 do not overlap, and the non-display area may be an area where the display panel 160 and the top chassis 150 overlap. Also, the shape of the display area is similar to that of the second substrate 162, but the internal area may be small. Also, boundary lines between the display area and the non-display area may be parallel to sides of the second substrate 162 that face each other. Also, a shape formed by the boundary line between the display area and the non-display area may have a rectangular shape.

At least a portion of the first substrate 161 may overlap the second substrate 162. The central portion of the area where the first substrate 161 and the second substrate 162 overlap may be the display area, and the edge portion of the area where the first substrate 161 and the second substrate 162 overlap is not displayed It can be an area. In a region where the first substrate 161 and the second substrate 162 do not overlap, the driver 164 and the printed circuit board 167 may be attached.

The second substrate 162 may be disposed to face the first substrate 161. A liquid crystal layer may be interposed between the first substrate 161 and the second substrate 162. Between the first substrate 161 and the second substrate 162, a sealing member such as a sealant is disposed along the edge portions of the first substrate 161 and the second substrate 162, so that the first substrate 161 and the second substrate 162 The substrates 162 may be bonded to each other and sealed.

The first substrate 161 and the second substrate 162 may have a rectangular parallelepiped shape. For convenience of explanation, the shapes of the first and second substrates 161 and 162 are shown as a rectangular parallelepiped, but the shape of the first substrate 161 and the second substrate 162 is not limited thereto, and the shape of the display panel 160 The substrate 162 may be manufactured in various shapes.

The driver 164 may apply various signals, such as a driving signal, required to display an image in the display area. The printed circuit board 167 may output various signals to the driver 164.

An optical sheet 126, a backlight unit, and a bottom chassis 152 may be disposed on the rear surface of the display panel 160. Regarding the positional relationship based on the backlight unit, the optical sheet 126 may be disposed above the backlight unit, and the bottom chassis 152 may be disposed below the backlight unit.

At least one optical sheet 121 that modulates optical properties of light and a mold frame 151 accommodating them may be disposed on the backlight unit.

Here, the mold frame 151 may be in contact with an edge portion of the other surface of the display panel 160 to support and fix the display panel 160. In an exemplary embodiment, the edge portion of the other surface of the display panel 160 may be a non-display area of the display panel 160. That is, at least a portion of the mold frame 151 may overlap the non-display area of the display panel 160.

The top chassis 150 may cover an edge of the display panel 160 and may wrap a side surface of the display panel 160. The bottom chassis 152 may accommodate the optical sheet 121 and the backlight unit 300. The top chassis 150 and the bottom chassis 152 may be made of a conductive material, such as a metal.

Embodiments of the present invention have been described above with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. You can understand. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects.

100: light guide plate
110, 111: upper surface
120: if
130: first aspect
140: second aspect
200: light source unit
210: light source
220: base
300, 301, 302, 303, 304, 305, 306, 307, 308: scattering pattern
1201: reference plane
400: prism sheet
410: prism
1000: liquid crystal display
160: display panel
150: top chassis
151: mold frame
152: bottom chassis

Claims (30)

an upper surface including a first side extending in the x-axis direction and a second side extending in the y-axis direction;
A lower surface disposed to face the upper surface;
Including a first side and a second side disposed to be opposed to each other between the upper surface and the lower surface,
The lower surface includes a reference surface and a plurality of scattering patterns protruding or depressed from the reference surface,
The scattering pattern includes a first inclined surface forming a first angle with the reference surface and a second inclined surface having one end in contact with the first inclined surface and forming a second angle with the reference surface,
The first angle is 1.8 to 5.7 degrees,
The planar shape of the scattering pattern is an elliptical shape having a major axis and a minor axis,
The major axis extends in the x-axis direction, the minor axis extends in the y-axis direction,
The first inclined surface and the second inclined surface are each semi-elliptical flat surface,
The light guide plate having a width of the first inclined surface with respect to the x-axis direction is greater than that of the second inclined surface. delete The method of claim 1,
The first angle is a light guide plate of 3.3 degrees. delete delete delete The method of claim 1,
The scattering pattern is formed to protrude from the reference plane,
The cross-sectional shape obtained by cutting the scattering pattern in the x-axis direction includes a convex parabola,
The cross-sectional shape obtained by cutting the scattering pattern in the y-axis direction includes a parabola convex upward. The method of claim 1,
The scattering pattern is formed depressed from the reference surface toward the upper surface,
The cross-sectional shape obtained by cutting the scattering pattern in the x-axis direction includes a downwardly convex parabola,
The cross-sectional shape obtained by cutting the scattering pattern in the y-axis direction includes a downwardly convex parabola. delete an upper surface including a first side extending in the x-axis direction and a second side extending in the y-axis direction;
A lower surface disposed to face the upper surface;
Including a first side and a second side disposed to be opposed to each other between the upper surface and the lower surface,
The lower surface includes a reference surface and a plurality of scattering patterns protruding or depressed from the reference surface,
The scattering pattern includes a first inclined surface forming a first angle with the reference surface and a second inclined surface having one end in contact with the first inclined surface and forming a second angle with the reference surface,
The first angle is 1.8 to 5.7 degrees,
The planar shape of the scattering pattern is an elliptical shape having a major axis and a minor axis,
The major axis extends in the x-axis direction, the minor axis extends in the y-axis direction,
The first inclined surface and the second inclined surface are each semi-elliptical flat surface,
A light guide plate having a width of the first inclined surface that is greater than a width of the second inclined surface based on the x-axis direction;
A light source unit disposed adjacent to the first side surface of the light guide plate; And
A backlight unit comprising a prism sheet disposed on the light guide plate and having a plurality of prisms facing an upper surface of the light guide plate. The method of claim 10,
The plurality of prisms are disposed along the x-axis direction, and each of the prisms extends along the y-axis direction. The method of claim 10,
Each of the prisms includes a mountain part, and the mountain part is a backlight unit disposed to face an upper surface of the light guide plate. The method of claim 12,
A third angle, which is the inner angle of the ridge, is defined,
The first angle is 3.3 degrees,
The third angle is a backlight unit of 65 degrees. The method of claim 12,
A third angle, which is the inner angle of the ridge, is defined,
The first angle is 2.3 degrees,
The third angle is a backlight unit of 68 degrees. delete delete The method of claim 10,
The scattering pattern is formed to protrude from the reference plane,
The cross-sectional shape obtained by cutting the scattering pattern in the x-axis direction includes a convex parabola,
The cross-sectional shape obtained by cutting the scattering pattern in the y-axis direction includes a parabola convex upward. The method of claim 10,
The scattering pattern is formed depressed from the reference surface toward the upper surface,
The cross-sectional shape obtained by cutting the scattering pattern in the x-axis direction includes a downwardly convex parabola,
The cross-sectional shape obtained by cutting the scattering pattern in the y-axis direction includes a downwardly convex parabola. delete The method of claim 10,
A backlight unit in which the number of scattering patterns per unit area increases from a lower surface of the light guide plate in the positive x-axis direction. The method of claim 10,
The size of each of the scattering patterns on the lower surface of the light guide plate increases toward the positive x-axis direction. The method of claim 10,
The upper surface of the light guide plate includes a first flat surface extending in a horizontal direction from an upper end of the first side surface, an inclined surface inclined downward from an end of the first flat surface, and a second flat surface extending in a horizontal direction from an end of the inclined surface. Backlight unit comprising. The method of claim 10,
A backlight unit in which a plurality of diffusion patterns are formed on an upper surface of the light guide plate. The method of claim 10,
The backlight unit further comprises a second light source adjacent to the second side. Backlight unit; And
Including a display panel disposed on the backlight unit,
The backlight unit
an upper surface including a first side extending in the x-axis direction and a second side extending in the y-axis direction;
A lower surface disposed to face the upper surface;
Including a first side and a second side disposed to be opposed to each other between the upper surface and the lower surface,
The lower surface includes a reference surface and a plurality of scattering patterns protruding or depressed from the reference surface,
The scattering pattern includes a first inclined surface forming a first angle with the reference surface and a second inclined surface having one end in contact with the first inclined surface and forming a second angle with the reference surface,
The first angle is 1.8 to 5.7 degrees,
The planar shape of the scattering pattern is an elliptical shape having a major axis and a minor axis,
The major axis extends in the x-axis direction, the minor axis extends in the y-axis direction,
The first inclined surface and the second inclined surface are each semi-elliptical flat surface,
A light guide plate having a width of the first inclined surface that is greater than a width of the second inclined surface based on the x-axis direction;
A light source unit disposed adjacent to the first side surface of the light guide plate; And
A liquid crystal display device comprising a prism sheet disposed on the light guide plate and having a plurality of prisms facing an upper surface of the light guide plate. The method of claim 25,
Each of the prisms includes an acid portion, and the acid portion is disposed to face an upper surface of the light guide plate. The method of claim 26,
A third angle, which is the inner angle of the ridge, is defined,
The first angle is 3.3 degrees,
The third angle is 65 degrees. The method of claim 26,
A third angle, which is the inner angle of the ridge, is defined,
The first angle is 2.3 degrees,
The third angle is 68 degrees. The method of claim 25,
The scattering pattern is formed to protrude from the reference plane,
The cross-sectional shape obtained by cutting the scattering pattern in the x-axis direction includes a convex parabola,
A cross-sectional shape obtained by cutting the scattering pattern in the y-axis direction includes a parabola convex upward. The method of claim 25,
The scattering pattern is formed depressed from the reference surface toward the upper surface,
The cross-sectional shape obtained by cutting the scattering pattern in the x-axis direction includes a downwardly convex parabola,
The cross-sectional shape obtained by cutting the scattering pattern in the y-axis direction includes a downwardly convex parabola.

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