KR20180034765A - Prism sheet, back light unit and liquid crystal display device having thereof - Google Patents

Abstract

The present invention relates to a prism sheet capable of further improving luminance characteristics while satisfying a half angle specification, and a backlight unit and a liquid crystal display device including the same. The prism sheet according to the present invention includes a base film and a plurality of prisms configured with a triangular pyramid-shaped cross section and a triangular front edge part of a curved shape with a curvature radius to form a preset half angle and arranged on the front side of the base film. The half angle specification which is not previously satisfied can be satisfied by preventing the deterioration of the luminance characteristics of light by improving a half angle characteristic by deforming the prism cross section of the prism sheet. The prisms with different shapes or same shapes are constantly arranged by deforming the prism cross section, thereby improving the luminance characteristics of the light and further improving light efficiency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a prism sheet, a backlight unit having the prism sheet,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prism sheet and a backlight unit and a liquid crystal display having the prism sheet, and more particularly to a prism sheet capable of satisfying a half-size specification and further improving luminance characteristics.

A liquid crystal display device which is advantageous for moving picture display and has a large contrast ratio and which is actively used in a TV or a monitor is used in a liquid crystal display device which is produced by optical anisotropy and polarization of a liquid crystal It represents the image implementation principle.

The liquid crystal panel of such a liquid crystal display device changes the arrangement direction of the liquid crystal molecules due to the electric field characteristics of each pixel, thereby realizing the brightness with the difference in transmittance. However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image, and a backlight unit having a light source built therein is disposed on the back surface of the liquid crystal panel.

The backlight unit includes a plurality of optical sheets including at least one diffusion sheet and a prism sheet to improve the brightness of light emitted from the light source. Particularly, in order to realize high brightness, a diffusion sheet and a plurality of prism sheets may be stacked over a plurality of sheets.

However, since the liquid crystal display device has been widely used as a monitor and a wall-mounted image publicity device as well as a portable mobile communication terminal device, efforts are being made to realize a lightweight and thin liquid crystal display device. In particular, a technique capable of improving luminance without increasing the thickness is further demanded.

In addition, the commercial products used as the constant image publicity device are required to be more lightweight and thin, while the half angle characteristics of the up, down, left, and right sides are required to be standardized to realize an angle of more than 38 degrees. Here, the half-value angle is an angle that is 50% of the peak luminance value emitted from the light source, and is such that the half-value angle of 50% of the peak luminance value emitted from the backlight unit is maintained and formed at 38 degrees or more.

However, in the conventional liquid crystal display device, luminance has to be reduced because the light has to be further scattered in order to realize more than 38 degrees of half-angle characteristic. On the other hand, in order to increase the luminance characteristic, the viewing angle is narrowed There was a problem that it was necessary to endure.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a prism sheet, in which a triangular prism section of a prism sheet is deformed and triangular prisms having the same or different shapes are uniformly arranged, And it is an object of the present invention to provide a prism sheet and a backlight unit and a liquid crystal display device having the prism sheet.

As described above, in order to improve the half-value angle characteristics of light emitted through the optical sheet, in particular, the prism sheet, the triangular prism section shape is modified in order to prevent the luminance characteristic of the light from deteriorating or further improve the luminance characteristic, So that the object can be achieved. To this end, the prism sheet according to the present invention comprises a base film and a plurality of prism sheets each having a curved shape with a radius of curvature such that a front edge portion of a triangular shape has a predetermined half angle, Of the prism.

Further, the backlight unit for achieving the object of the present invention as described above includes a bottom cover, a light guide plate disposed inside the bottom cover, at least one light emitting module for emitting light to the light guide plate, and a light- Wherein at least one of the prism sheet has a base film and a triangular shape in section, wherein the front edge portion of the triangular shape has a radius of curvature so as to form a predetermined half angle, And a plurality of prisms arranged in a curved shape and arranged on the front surface of the base film.

In addition, the backlight unit for achieving the object of the present invention as described above is a liquid crystal display device having a liquid crystal panel in which a plurality of pixel regions are defined and an image is displayed, and a backlight unit for irradiating light to the liquid crystal panel In the configuration, the backlight unit includes at least one light emitting module disposed inside the bottom cover, at least one light emitting module for emitting light to the light guide plate, and at least one prism sheet disposed on the front surface of the light guide plate for collecting light from the light guide plate Wherein at least one prism sheet has a curved shape with a radius of curvature such that a front edge portion of the triangular shape of the base film and the triangular shape of the triangular shape of the base film forms a predetermined half angle, Of the prism.

A prism sheet according to an embodiment of the present invention having various technical features as described above, and a backlight unit and a liquid crystal display device having the same have deformation of a prism sectional shape of a prism sheet, And it is possible to satisfy the half-size specifications which have not been satisfied before.

In addition, by changing the cross-sectional shape of the prism, the prisms having the same shape or different shapes are arranged uniformly, thereby improving the brightness characteristics of light and further improving the light efficiency.

1 is a perspective view illustrating a prism sheet according to an embodiment of the present invention.
2 is a cross-sectional view specifically showing a cross section taken along the line II 'in FIG.
3 is a cross-sectional view for explaining the half angle characteristic and the light output efficiency according to the prismatic deformation of the prism sheet.
FIG. 4 is a cross-sectional view illustrating various configurations of a prism array according to an embodiment of the present invention.
5 is another cross-sectional view specifically showing a cross section taken along line II 'in FIG.
6 is an exploded perspective view showing an edge type backlight unit and a liquid crystal display device having a prism sheet according to an embodiment of the present invention.
7 is another perspective view illustrating a direct-type backlight unit and a liquid crystal display device having a prism sheet according to an embodiment of the present invention.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, a prism sheet according to an embodiment of the present invention and a backlight unit and a liquid crystal display device having the same will be described in detail with reference to the accompanying drawings.

1 is a perspective view illustrating a prism sheet according to an embodiment of the present invention. And FIG. 2 is a cross-sectional view specifically showing a cross-section taken along line I-I 'of FIG.

The prism sheet 121 shown in FIGS. 1 and 2 includes a base film 121a and a plurality of prisms 121b and 121c uniformly arranged on the entire surface of the base film 121a so as to form the same or different half angle, .

The base film 121a may be made of polyethylene terephthalate (PET), a transparent plastic resin, or an acrylic resin. But it is not limited thereto. Therefore, it can be replaced with an extremely thin film having excellent durability and excellent electrical properties such as PET.

The plurality of prisms 121b and 121c may be uniformly arranged or patterned on the entire surface of the base film 121a. The plurality of prisms 121b and 121c may include at least one of an acrylic resin, a fluorine-containing compound, and a silicon-containing compound.

The plurality of prisms 121b and 121c have a triangular cross section, but are configured to have predetermined curvatures at corner portions of the front surface. In other words, in the present invention, the cross-sectional shape of each of the prisms 121b and 121c is a triangular peak shape, but the front corner portion of the triangular shape is formed in a curved shape so as to form a predetermined half angle, Curvature).

The half angle is an angle that is 50% of the front luminance peak value at which light from the light source is transmitted and outputted. Here, the half angle is an angle that is emitted from the light source and transmitted through at least one prism 121b, 121c of the prism sheet 121 or the prism sheet 121 Is 50% of the luminance peak value. Therefore, when the peak emission luminance is 100 cd / m < 2 > (= nit) at the front side, any angle at which the emission luminance is observed at 50 cd / m 2 when transmitted through at least one prism 121 b, 121 c of the prism sheet 121 is Angle. Thus, when the half angle is formed to be 38 degrees or more, a curvature is formed at the front corner of the triangle so that a half angle of 38 degrees or more is formed, and the corresponding radius of curvature is maintained.

Referring to FIG. 2, the plurality of prisms 121b and 121c includes a plurality of first prisms 121b each having a front corner portion of a triangular cross section configured to have a curvature and a radius of curvature to form a predetermined first half angle, And a plurality of second prisms 121c configured to have a curvature and a radius of curvature to form a second half-angle angle different from the first half-angle angle, the front edge portion of the shape cross-section.

The first half angle formed by the plurality of first prisms 121b may be 42 degrees. Alternatively, the second half angle formed by the plurality of second prisms 121c may be 39 degrees. The plurality of first prisms 121b and the plurality of second prisms 121c are formed such that the curvature is formed at the front corner portion of the triangle so that the half-value angles of 42 degrees and 39 degrees are formed, respectively, .

As shown in FIG. 2, a plurality of first prisms 121b forming a first half angle and a plurality of second prisms 121c forming a second half angle are alternately arranged . In other words, a plurality of first and second prisms 121b and 121c may be alternately arranged one by one, and a plurality of first and second prisms 121b and 121c may be arranged in two or three or more plural units They may be arranged alternately.

3 is a cross-sectional view for explaining the half angle characteristic and the light output efficiency according to the prismatic deformation of the prism sheet.

Referring to FIG. 3, the cross-sectional shape of the prism formed on the prism sheet 121 may be hemispherical, triangular, or polygonal in various forms.

3 (a), when the prism has a hemispherical shape having a constant curvature, the hemispherical curvature is 30 R in curvature R, and the hemispherical shape having a curvature of 30 R is 44 degrees in the front direction. The hemispherical shape with a curvature of 30R has a side-by-side half angle of 51 degrees in the lateral direction. In this case, the optical efficiency is 105% as an experimental value. In this case, when the cross-sectional shape of the prism is a hemispherical shape having a constant curvature, the vertically and horizontally halftone angles can be maintained at 38 degrees or more, which is a standard range. However, the light efficiency due to scattering is inevitably decreased as the half-

On the other hand, when the cross-sectional shape of the prism is a triangle having no curvature as shown in 3 (b), the triangle is 0R with no curvature. Since the side angle of the light source and triangle of the back surface is always constant, the triangular shape with a curvature of 0 is 31 degrees smaller in the vertical direction. And the triangle has a side angle of 49 degrees in the lateral direction. In this case, the optical efficiency is 122% as an experimental value. Thus, when the cross-sectional shape of the prism is a triangular shape without curvature, the upper and lower half-value angles are equal to or less than the standard range of 38 degrees. When the half-value angle is narrow, the light efficiency on the straight line is improved, but the half-angle angle is narrowed and the viewing angle is inevitably narrowed.

In the case of a plurality of first prisms 121b configured to have a curvature and a radius of curvature only in the front edge portion of the triangular cross section as shown in FIG. 3 (c), the first front half angle is set to 42 degrees A curvature may be formed such that the first half angle is formed. In this case, the front curvature is 7R, and the vertical half angle in the front direction is 42 degrees. The lateral half angle is 49 degrees in the lateral direction, and the light efficiency is 105% in the experimental data. As described above, in the case of the first prism 121b having the curvature and the curvature radius only at the front edge portion, it is possible to determine that the vertical efficiency and the light efficiency are somewhat lowered have.

On the other hand, in the case of a plurality of second prisms 121c configured to have a curvature and a radius of curvature only in the front corner portion of the triangular cross-section as in 3 (d), the second half- A curvature may be formed or configured such that a second half angle angle of 39 degrees is formed. In this case, the front curvature is 6R, and the upper and lower half angle in the front direction is 39 degrees. The lateral half angle is 49 degrees in the lateral direction, and the light efficiency is 110% in the experimental value. As described above, in the case of the second prism 121c, it is possible to judge that the light efficiency is improved although the upper and lower half-angle characteristics are somewhat lowered compared with the first prism 121b.

If at least one of the first prisms 121b forming the first half angle and the plurality of second prisms 121c forming the second half angle are alternately arranged, The light efficiency can be appropriately adjusted and improved.

FIG. 4 is a cross-sectional view illustrating various configurations of a prism array according to an embodiment of the present invention.

4 (a) shows an example in which a plurality of first prisms 121b constituting the first half angle are arranged on the base film 121a. In the case where only a plurality of first prisms 121b are disposed, the vertical half angle in the front direction is 42 degrees, the horizontal half angle is 49 degrees, and the light efficiency is 105%. Therefore, if only the plurality of first prisms 121b are disposed, the vertical angle and the left and right half angle can be kept wide, so that the present invention can be applied to a small-size panel or a small display device in which the viewing angle characteristic is set more important than the light efficiency.

4 (b) shows an example in which only a plurality of first prisms 121c forming the second half angle are disposed on the base film 121a. When only a plurality of second prisms 121c are disposed, the upper and lower half angle angles in the front direction are 39 degrees, the left and right half angle angles in the side direction are 49 degrees, and the light efficiency is 110%. Therefore, if only the plurality of second prisms 121c are disposed, the light efficiency can be increased even if the vertical angle and the left / right half angle are narrowed, so that it can be applied to a lighting device or a large panel .

4 (c), on the base film 121a, a plurality of first prisms 121b forming a first half angle and a plurality of second prisms 121c forming a second half angle are alternately As shown in Fig. When the first prism 121b and the second prism 121c are combined as described above, the upper and lower half angle angles are maintained at 39 degrees while the left and right half angle angles are maintained at 49 degrees, and the resulting light efficiency is also 110% . Therefore, when the first prism 121b and the second prism 121c are combined, the light efficiency can be improved while maintaining the full-angle characteristic at or above the standard range.

5 is another cross-sectional view specifically showing a cross section taken along line I-I 'of FIG.

As shown in FIG. 5, the plurality of first prisms 121b forming the first half angle and the plurality of second prisms 121c forming the second half angle are alternately arranged at least one, , At least one of the first and second prisms 121b and 121c may be arranged apart from each other.

In other words, the plurality of first prisms 121b and second prisms 121c disposed adjacent to each other may be arranged so that the intervals between the adjacent prisms are not spaced apart as shown in FIGS. 1 and 2, but at least one The first and second prisms 121b and 121c may be spaced apart from each other.

In terms of the light diffusion efficiency of the prism sheet, it is preferable that the plurality of first and second prisms 121b and 121c arranged on the base film 121a are arranged so as not to be separated from each other. However, at least one of the first and second prisms 121b and 121c may be arranged to be spaced apart from each other according to the requirement according to the prism sheet application environment. At this time, it is preferable that the light in the form of a line is not recognized by the interval between the first and second prisms 121b and 121c. Therefore, the spacing d between the first and second prisms 121b and 121c, It is preferable to arrange them so as to be spaced apart by an interval of 1/3 or less of the width w.

6 is an exploded perspective view showing an edge type backlight unit and a liquid crystal display device having a prism sheet according to an embodiment of the present invention.

First, the structure of the backlight unit 129 of the liquid crystal display device of FIG. 6 will be described first.

The backlight unit 129 of the liquid crystal display device includes a bottom cover 150, a reflection plate 128 disposed on the inner surface of the bottom cover 150, a light guide plate 127 disposed on the front surface of the reflection plate 128, And a plurality of optical sheets 120 including the at least one prism sheet 121 described above.

The bottom cover 150 has four sides of the bottom or bottom of the bottom folded in the front direction so that the four sides of the bottom cover 150 are formed in the shape of a rectangular frame whose face is open. A reflection plate 128, a light emitting module 126, a light guide plate 127, and a plurality of optical sheets 120 are accommodated in the bottom cover 150.

The light emitting module 126 includes at least one printed circuit board 124 having at least one light source 125 and at least one light source 125 and a drive circuit for driving the at least one light source 125 .

Each of the light sources 125 may be a light emitting diode (LED). The plurality of LEDs may be spaced apart from each other at a predetermined interval and may be mounted on the printed circuit board 124, .

Although not shown in the drawing, a fluorescent lamp may be used in place of the light emitting module 126 using LEDs. In this case, a lamp guide for guiding and guiding the outside of the fluorescent lamp and focusing the light toward the light guide plate 127 may be further included.

The light emitting module 126 is fixed in position by adhesion or the like so that the light emitted from the plurality of light sources 125 faces the side light incoming surface of the light guide plate 127. Although the light emitting modules 126 are illustrated as being arranged on only one side of the light guide plate 127 in the figure, they may be arranged on opposite sides of a plurality of side surfaces, for example, the light guide plate 127, .

The driver circuit for driving the light sources 125 may be further provided on the printed circuit board 124 of the light emitting module 126, for example, an LED driver integrated circuit (not shown). The light emitted from each light source 125 by the LED driver integrated circuit is indirectly emitted toward the liquid crystal panel by using refraction and reflection at the light guide plate 127. [

The reflection plate 128 is positioned on the inner bottom surface of the bottom cover 150 and is configured to correspond to the back surface direction of the light guide plate 127. In addition, the reflection plate 128 may be formed on the inner side surface of the bottom cover 150 to cover the side surface of the light guide plate 127. The reflection plate 128 reflects the light directed toward the back surface and the side surface of the light guide plate 127 toward the front surface of the light guide plate 127, thereby improving the brightness of the light emitted.

The light guide plate 127 uniformly spreads the light incident from each of the light sources 125 of the light emitting module 126 to the wide area of the front surface of the light guide plate 127 while advancing in the light guide plate 127 by total reflection, .

The light guide plate 127 may include a pattern of a specific shape on the back surface to supply a uniform surface light source. The pattern may be formed in various shapes such as an elliptical pattern, a polygonal pattern, a hologram pattern, and the like in order to guide light incident into the light guide plate 127, And may be formed on the lower surface of the base plate 127 by a printing method or an injection method.

The plurality of optical sheets 120 mounted on the light guide plate 127 diffuses or condenses the light converted into the surface light source by the light guide plate 127 so that a more uniform surface light source is incident on the liquid crystal panel on the front side.

The plurality of optical sheets 120 may include at least one diffusing sheet 122 for diffusing light, at least one prism sheet 121 for condensing light, and an auxiliary sheet 121 for protecting the prism sheet 121 and diffusing light A protective sheet 123 may be included. Here, the prism sheet 121, which is a characteristic element of the present invention, may be the prism sheet 121 shown in FIGS. 1 to 4 described above. The prism sheet 121 will be described in detail with reference to FIGS. 1 to 5. FIG.

The plurality of optical sheets 120 are not limited to those shown in Fig. 6, and may be composed of a diffusion sheet 122 and a prism sheet 121, or a prism sheet 121 and a protective sheet 123, Only the prism sheet 121 may be interposed.

7 is another perspective view illustrating a direct-type backlight unit and a liquid crystal display device having a prism sheet according to an embodiment of the present invention.

The structure of the direct-type backlight unit 129 of Fig. 7 is different from that of the edge-type backlight unit of Fig. 5 in the arrangement structure of the light-emitting module 126 and the light-

A plurality of light emitting modules 126 are arranged and arranged on the front surface of the reflection plate 128 in a state in which the reflection plate 128 disposed on the inner front surface of the bottom cover 150 is disposed. A light guide plate 127 is disposed on the entire surface of the plurality of light emitting modules 126. Accordingly, the plurality of light emitting modules 126 irradiate light to the back surface of the light guide plate 127 disposed on the front surface.

A plurality of optical sheets 120 including the at least one prism sheet 121 described above may be disposed and configured on the front surface of the light guide plate 127.

The light emitting module 126 is configured such that a plurality of light sources 125 are mounted on a plurality of printed circuit boards 124, respectively. Each of the light sources 125 may be a light emitting diode (LED), and the plurality of LEDs are spaced apart from each other at a predetermined interval to be mounted on the printed circuit board 124 and irradiate light toward the back surface of the light guide plate 127. Although not shown in the drawing, a fluorescent lamp may be used in place of the light emitting module 126 using LEDs.

6 and 7, the liquid crystal display device shown in FIGS. 6 and 7 includes a liquid crystal panel 110 in which a plurality of pixel regions are defined to display an image, a backlight unit A support main body 130 for modulating the liquid crystal panel 110 and the backlight unit 129, In addition, a top case 140 may be further provided to cover and protect the outer and inner surfaces of the front and rear sides of the liquid crystal panel 110 and the support main body 130.

The liquid crystal panel 110 is a part that plays a key role in image display and is composed of a first substrate 112 and a second substrate 115 which are bonded to each other with a liquid crystal layer interposed therebetween. Although not shown in the drawing, pixel regions are defined on the inner surface of a first substrate 112, which is usually called a lower substrate or an array substrate, on the premise of an active matrix method, in which a plurality of gate lines and data lines cross each other, A thin film transistor (TFT) is provided and connected in a one-to-one correspondence with the transparent pixel electrodes formed in the respective pixel regions.

A color filter of red (R), green (G) and blue (B) colors corresponding to each pixel is formed on the inner surface of a second substrate 115 called an upper substrate or a color substrate, A black matrix for covering non-display elements such as a gate line, a data line, and a thin film transistor, and a transparent common electrode covering the black matrix. Here, the transparent common electrode may be formed on the first substrate 112. A polarizing plate (not shown) selectively transmitting only specific light is attached to the outer surfaces of the first and second substrates 112 and 115, respectively.

A printed circuit board 117 is connected to at least one edge of the liquid crystal panel 110 via a connection member 116 such as a flexible circuit board or a tape carrier package (TCP) The main cover 130 or the bottom cover 150 may be appropriately folded and brought into close contact with each other.

When the thin film transistor selected for each gate line is turned on by the ON or OFF signal of the gate driving circuit transmitted through the printed circuit board 117, the liquid crystal panel 110 having the above- Is transmitted to the corresponding pixel electrode through the data line, and the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode.

A backlight unit 129 according to an embodiment of the present invention is provided on the back surface of the liquid crystal panel 110 to supply light so that a difference in transmittance can be displayed as an image. The liquid crystal panel 110 and the backlight unit 129 described above are modularized through the top case 140, the support main body 130, and the bottom cover 150.

More specifically, the liquid crystal panel 110 and the backlight unit 129 include a top case 140 which surrounds the upper surface of the liquid crystal panel 110 in a state where the liquid crystal panel 110 and the backlight unit 129 are surrounded by the support main body 130, And the bottom cover 150 covering the back surface of the main cover 129 are coupled to each other at the front and rear sides to be integrated into a module through the support main 130.

The light emitted from each of the plurality of light sources 125 of the backlight unit 129 is incident on the side or backlight incident surface of the light guide plate 127 and then refracted toward the liquid crystal panel 110 And is processed into a more uniform high-quality surface light source while being passed through the plurality of optical sheets 120 together with the light reflected by the reflection plate 128, and is supplied to the liquid crystal panel 110.

As described above, the plurality of optical sheets 120 includes at least one diffusion sheet 122 for diffusing light, at least one prism sheet 121 for condensing light, and a prism sheet 121, And a protective sheet 123 serving as an assistant to the user. Here, the prism sheet 121, which is a characteristic element of the present invention, may be the prism sheet 121 shown in FIGS. 1 to 5 described above. Thus, the prism sheet 121 will be described in detail with reference to FIGS. 1 to 4. FIG.

The prism sheet 121 and the backlight unit 129 having the various technical features as described above and the backlight unit 129 having the same and the liquid crystal display device according to the embodiment of the present invention can be manufactured by deforming the prism sheet 121 By increasing the half-angle characteristics, the luminance characteristics of the light are not degraded, and the half-size specifications which can not be satisfied before can be satisfied.

Further, by changing the cross-sectional shape of the prism and arranging the prisms having the same or different shapes to be constant, the luminance characteristics of the light can be improved and the light efficiency can be further improved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the following claims. It will be possible.

110: liquid crystal panel
120: plural diffusion sheets
121: prism sheet
121a: base film
121b: a plurality of first prisms
121c: a plurality of second prisms
126: Light emitting module
129: Backlight unit
130: Support Main
140: Top case

Claims (15)

A base film; And
A plurality of prisms arranged in front of the base film and having a curvature radius so as to form a predetermined half angle, while the front edge portion of the triangle has a triangular shape in cross section;
A prism sheet,
The method according to claim 1,
The plurality of prisms
The front edge portion of the triangular shape has a triangular shape in cross section, a plurality of first prisms configured to have a curvature and a radius of curvature to form a predetermined first half angle, And
A plurality of second prisms configured such that a front edge portion of the triangular shape has a curvature and a radius of curvature forming a second half angle different from the first half angle;
.
3. The method of claim 2,
The plurality of prisms
At least one of the plurality of first prisms constituting the first half angle and the plurality of second prisms constituting the second half angle are alternately arranged.
The method of claim 3,
The plurality of prisms
The prism sheet being arranged so as to be spaced apart from each other by a distance of not more than 1/3 of the width of the base of the triangular shape.
The method of claim 3,
The first half-value angle is set so that the up-and-down half angle is 42 degrees and the left and right half-size angle is 49 degrees in the front direction,
The second half-value angle is set so that the up-and-down half angle is 39 degrees and the left and right half-size angle is 49 degrees in the front direction,
Wherein the plurality of first prisms and the plurality of second prisms are alternately arranged so that the upper and lower half angle angles are set to 39 degrees and the left and right half angle angles are set to 49 degrees in the front direction.
Bottom cover;
A light guide plate disposed inside the bottom cover;
At least one light emitting module for emitting light to the light guide plate; And
And at least one prism sheet disposed on the front surface of the light guide plate for collecting and outputting light from the light guide plate,
The at least one prism sheet
A base film; And
A plurality of prisms arranged in front of the base film and having a curvature radius so as to form a predetermined half angle, while the front edge portion of the triangle has a triangular shape in cross section;
And a backlight unit.
The method according to claim 6,
The plurality of prisms
The front edge portion of the triangular shape has a triangular shape in cross section, a plurality of first prisms configured to have a curvature and a radius of curvature to form a predetermined first half angle, And
A plurality of second prisms configured such that a front edge portion of the triangular shape has a curvature and a radius of curvature forming a second half angle different from the first half angle;
And a backlight unit.
8. The method of claim 7,
The plurality of prisms
Wherein at least one of the plurality of first prisms forming the first half angle and the plurality of second prisms forming the second half angle are alternately arranged.
9. The method of claim 8,
The plurality of prisms
And arranged so as to be spaced apart from each other by not more than 1/3 of the base width of the triangular shape.
9. The method of claim 8,
The first half-value angle is set so that the up-and-down half angle is 42 degrees and the left and right half-size angle is 49 degrees in the front direction,
The second half-value angle is set so that the up-and-down half angle is 39 degrees and the left and right half-size angle is 49 degrees in the front direction,
Wherein the upper and lower half angle angles are set to 39 degrees and the left and right half angle angles are set to 49 degrees in the front direction when the plurality of first prisms and the plurality of second prisms are alternately arranged.
A liquid crystal display comprising a liquid crystal panel in which a plurality of pixel regions are defined to display an image, and a backlight unit for irradiating light to the liquid crystal panel,
The backlight unit
A light guide plate disposed inside the bottom cover;
At least one light emitting module for emitting light to the light guide plate; And
And at least one prism sheet disposed on the front surface of the light guide plate for collecting and outputting light from the light guide plate,
The at least one prism sheet
The at least one prism sheet
A base film; And
A plurality of prisms arranged in front of the base film and having a curvature radius so as to form a predetermined half angle, while the front edge portion of the triangle has a triangular shape in cross section;
And the liquid crystal display device.
12. The method of claim 11,
The plurality of prisms
The front edge portion of the triangular shape has a triangular shape in cross section, a plurality of first prisms configured to have a curvature and a radius of curvature to form a predetermined first half angle, And
A plurality of second prisms configured such that a front edge portion of the triangular shape has a curvature and a radius of curvature forming a second half angle different from the first half angle;
And the liquid crystal display device.
13. The method of claim 12,
The plurality of prisms
Wherein at least one of the plurality of first prisms forming the first half angle and the plurality of second prisms forming the second half angle are alternately arranged.
14. The method of claim 13,
The plurality of prisms
And arranged so as to be spaced apart by an interval equal to or less than 1/3 of the width of the base of the triangular shape.
14. The method of claim 13,
The first half-value angle is set so that the up-and-down half angle is 42 degrees and the left and right half-size angle is 49 degrees in the front direction,
The second half-value angle is set so that the up-and-down half angle is 39 degrees and the left and right half-size angle is 49 degrees in the front direction,
And the upper and lower half-angle angles are set to 39 degrees and the left and right half-angle angles are set to 49 degrees in the front direction when the plurality of first prisms and the plurality of second prisms are alternately arranged.

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