KR101262874B1 - Optical element - Google Patents

Abstract

PURPOSE: An optical element with increased light diffusion is provided to enable a liquid crystal display panel to spread light to wide ranges for widening viewing angle, and to be integrated with other plates of a display panel when multiple laminated plates are equipped or a refraction plate and light guide plate are equipped together in the display panel. CONSTITUTION: An optical element comprises a base plate(140), a top unit(100) which is disposed at the top of the base plate, and a bottom unit(200) which is disposed at the bottom of the base plate. The top unit and the bottom unit respectively has a diffusion plate(110) which includes a plurality of bent diffusion parts(115) formed one or more surfaces of the top surface(111) and the bottom surface(113) of the diffusion plate. The base plate, the top unit, and the bottom unit are integrally formed. The plurality of bent diffusion parts are formed into a shape of intaglios. The intaglio-shaped bent surfaces of the bent diffusion parts are equipped with beads for scattering the light that passes through the bent diffusion parts.

Description

Optical member {OPTICAL ELEMENT}

The present invention relates to an optical member, and more particularly, to an optical member that can be applied to a liquid crystal display, a light receiving display, a sign, lighting, and the like.

In general, a liquid crystal display (LCD) is a representative display device widely used in various fields. Since the liquid crystal display is a non-light emitting device, a backlight unit for generating light is required.

Therefore, such a backlight unit is an important factor for determining the size and light efficiency of the liquid crystal display, and is composed of an assembly of various optical members.

In general, the backlight unit includes a light source, a light guide plate, a reflecting plate, a diffusion sheet, a prism sheet, and a protective sheet.

Light generated from the light source is directed to the diffusion sheet through the light guide plate, and light diffused by the diffusion sheet is directed to the liquid crystal display panel through the first and second prism sheets.

The diffusion sheet serves to provide uniform luminance over the entire area, and as such, the backlight assembly requires various various sheets for performing different optical functions.

In the backlight unit, the prism sheet performs a function of improving luminance in a specific viewing angle range. The luminance improvement at this particular viewing angle may be realized by condensing by the prism structure.

However, in the conventional liquid crystal display device, since the diffusion sheet and the prism sheet are provided by simple contact, the diffusion sheet and the prism sheet may be displaced when the liquid crystal display device is used for a long time.

Therefore, a light leakage phenomenon may occur in the liquid crystal display panel, or the light may not be properly refracted to the liquid crystal display panel, resulting in a narrow viewing angle or a problem in that the screen cannot be viewed at a specific viewing angle.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems of the prior art, and an object thereof is to diffuse more regions of light so that a viewing angle of a liquid crystal display panel is wider, and a plurality of diffusion plates are provided or a refractive plate and a light guide plate are provided. Even if it is provided together with the optical member that can be provided integrally provided.

In order to achieve the above object, the optical member according to the first aspect of the present application is a base plate; An upper layer part provided on an upper side of the base plate; And a lower layer provided below the base plate, wherein each of the upper layer and the lower layer includes a diffusion plate having a plurality of curved diffusions formed on one or more of an upper surface and a lower surface to diffuse light. The base plate, the upper layer portion, and the lower layer portion are integrally formed.

According to the present invention, since a plurality of diffusion plates can be directly stacked, the light can be diffused to more areas. In addition, since the diffusion plate is formed of an adhesive resin, a plurality of laminated diffusion plates may be integrally formed. In addition, when the base plate or the refracting plate is provided together by the adhesiveness of the diffusion plate, it may be integrated with the diffusion plate to prevent the occurrence of light leakage.

According to the present invention, by dividing a plurality of diffusion plates by dividing the optical member into a lower layer and an upper layer, the light diffusion efficiency can be increased, so that the brightness of the optical member can be improved, and the curved diffusion portion of each of the lower layer and the upper layer can be improved. By differently combining one or more of the shape and the surface on which the curved diffusions are formed, the light diffusion can be made more efficient and an optical member having a greatly improved luminance can be provided.

1 is a perspective view and a cross-sectional view showing a diffusion plate of an optical member according to an embodiment of the present invention.
2 shows an enlarged view of a part of the diffusion plate according to FIG. 1.
3 and 4 are a perspective view and a cross-sectional view showing another form of the diffusion plate of the optical member according to an embodiment of the present invention.
5A through 5N are cross-sectional views illustrating various embodiments of various upper and lower diffused plated parts according to an embodiment of the present invention.
6 is a cross-sectional view of an optical member according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

In the following description, the same reference numerals are used for the same or similar components, and overlapping descriptions will be briefly or omitted.

First, prior to describing the present invention, the optical member according to the exemplary embodiment of the present invention may be applied to various fields such as a liquid crystal display (LCD) as well as all light-receiving display devices such as electrophoretic display devices, signs, and lighting. .

1 is a perspective view and a cross-sectional view showing a diffusion plate of an optical member according to an embodiment of the present invention. 2 shows an enlarged view of a part of the diffusion plate according to FIG. 1. 3 and 4 are a perspective view and a cross-sectional view showing another form of the diffusion plate of the optical member according to an embodiment of the present invention. 5A to 5N are cross-sectional views illustrating various embodiments of stacked upper and lower layers of a plurality of diffusion plates according to an embodiment of the present invention. 6 is a cross-sectional view of an optical member according to another embodiment of the present invention.

1 to 5N, the optical member according to the exemplary embodiment includes diffusion plates 110, 110 ′, and 130.

The diffusion plates 110, 110 ′ and 130 serve to diffuse light into a wider area when light emitted from the light source is incident on the other surface side of the diffusion plates 110, 110 ′ and 130. Accordingly, the diffusion plates 110, 110 ′ and 130 may have a plurality of curved diffusions 115 formed on one or more surfaces of one side, that is, the upper side 113 and 131 and the lower side 113 and 133 to diffuse light. 135).

The curved diffusion portions 115 and 135 formed on at least one of the upper surfaces 111 and 131 and the lower surfaces 113 and 133 of the diffusion plates 110, 110 ′ and 130 are spaced apart from each other in an embossed or intaglio form. Can be formed.

Furthermore, the plurality of curved diffusions 115 and 135 formed on any one of the upper and lower surfaces of the diffusion plates 110, 110 ′ and 130 may be formed to be bent equally to each other in one of embossed and engraved forms. Can be. In other words, although the curved diffusion portions 115 and 135 formed on one surface of the diffusion plates 110, 110 ′ and 130 may have different shapes, the shapes may be different as shown in FIGS. 1 to 5N. By forming the same as each other, the light passing through the diffusion plate 110 can be made more uniform and regular.

For reference, referring to FIGS. 1A and 3A, the curved diffusions 115 and 135 may include one curved diffusion 115 and 135 for six curved diffusions 115 and 135. It may be formed to be arranged in a surrounding form. In other words, the curved diffusion portions 115 and 135 formed on one surface of the diffusion plates 110, 110 ′ and 130 may be formed in a two-dimensional hexagonal dense structure (or a triangular type array having a three-point center). The curved diffusion portions 115 and 135 may be formed to further increase the light diffusion efficiency.

In the following description, the concave diffusion portion 115 has a concave diffusion portion 115, and the concave diffusion portion 135 has a convex diffusion portion 135.

Referring to FIG. 1, a plurality of concave diffusion parts 115 may be formed in the diffusion plate 110 spaced apart from each other. For example, as shown in FIGS. 1A and 1B, the concave diffusion 115 is formed on the upper surface 111 of the diffusion plate 110, and according to FIG. 1C, the concave The diffuser 115 is formed on the lower side 113 of the diffuser plate 110. On the other hand, although not written in the drawing, in the diffusion plate 110 as shown in FIG. 1C, the concave diffusion portion 115 is not formed on the lower surface 113 of the diffusion plate 110. It may be formed on the upper side 111 of the diffusion plate 110.

For example, as shown in FIGS. 1A and 1B, after the concave diffusion portion 115 is formed on the upper surface 111 of the diffusion plate 110, the upper surface 111 of the diffusion plate 110 is formed. Inverting the diffusion plate 110 such that the position of the bottom surface 113) and the lower side 113 may be reversed may be formed as shown in the diffusion plate 110 shown in FIG.

Meanwhile, when the curved diffusion portion is formed as the concave diffusion portion 135, as shown in FIG. 2, an angle θ formed between the upper side 111 or the lower side 113 and the virtual axis X shown in the drawing is shown. ) May be a value between 10˚ ~ 170˚. Here, as shown in FIG. 2, the virtual axis X is the center of the concave diffuser 115 at the point A where the concave diffuser 115 and the upper side 111 or the lower side 113 abut. The axis intersects with C). Therefore, the depth of the concave diffusion portion 115 becomes deeper as the value of the angle θ formed between the upper side 111 or the lower side 113 and the virtual axis X becomes larger, and the upper side 111 or the lower side faces. As the value of the angle θ formed between the 113 and the virtual axis X becomes smaller, the depth becomes shallower.

Referring to FIG. 3, a plurality of convex diffusion parts 135 are spaced apart from each other in the diffusion plate 130. According to (a) and (b) of FIG. 3, the convex diffuser 135 is formed on the upper side 131 of the diffusion plate 130, and according to FIG. 3c, the convex diffuser 135 Is formed on the lower surface 133 of the diffusion plate 130. Meanwhile, although not shown in the drawing, in the diffusion plate 130 as shown in FIG. 3B, the convex diffusion 135 is not formed on the lower surface 133 of the diffusion plate 130. It may be formed on the upper side of the diffusion plate 130. For example, as shown in FIGS. 3A and 3B, after the convex diffusion 135 is formed on the upper surface 131 of the diffusion plate 130, the upper surface 131 of the diffusion plate 130 is formed. Inverting the diffusion plate 130 so that the position of the bottom surface 133 is reversed may be formed as shown in the diffusion plate 130 shown in FIG.

Referring to FIG. 4, a plurality of concave diffusion parts 115 may be formed on the diffusion plate 110 ′, spaced apart from each other, and a bead 117 may be provided in each concave diffusion part 115. The beads 117 are formed to further scatter the light passing through the concave diffusion 115. The beads 117 are preferably made of the same material as the diffusion plate 110 ', but after the diffusion plate 110' is manufactured in the same manner as the diffusion plate 110 shown in FIG. The concave surface of the 115 may be provided with a bead 117 manufactured separately. Therefore, according to (a) and (b) of FIG. 4, the concave diffusion part 115 having the beads 117 may be formed on the upper surface 111 of the diffusion plate 110 ′, and FIG. ), The concave diffusion portion 115 with the beads 117 may be formed on the lower side 113 of the diffusion plate 110 ′.

On the other hand, although not shown in the drawings, as described above, the curved diffusion portion is formed in an embossed or intaglio form on one or more of the upper side (111, 131) and the lower side (113, 133), the upper side 111 , 131 and the lower surfaces 113 and 133 may be formed in various shapes.

On the other hand, the diffusion plate (110, 110 ', 130) is formed of a resin having a tacky. The term “adhesiveness” refers to a state in which the adhesive force is semi-permanently maintained due to stickiness, and is different from the adhesion and adhesion in which the adhesive force is present only during the process and is lost after completion.

The diffusion plates 110, 110 ′ and 130 may be formed of a photocurable resin that is transparent to allow light to pass therethrough and that may be cured by light irradiation. For example, the photocurable resin may be made of any one of an ultraviolet curable resin cured by irradiation with ultraviolet rays and an infrared curable resin cured by irradiation with infrared rays.

As described above, the diffusion plates 110, 110 ′ and 130 may be made of a thermosetting resin having a tacky but cured by heat in addition to the photocurable resin having a tacky adhesive. For example, the heat may be a dry dryer. Can be supplied via In addition to the adhesive resin, it may be formed of an adhesive resin.

Optical member according to an embodiment of the present invention is provided with one or more diffusion plates 110, 110 ', 130 as described above are stacked. For example, the optical member may be provided with only one diffusion plate of the three types of diffusion plates 110, 110 ′ and 130 as described above, or three types of diffusion plates 110, 110 ′ and 130. A plurality of diffusion plates of different forms selected from among the plurality may be stacked and provided.

Meanwhile, the optical member including a plurality of diffusion plates may include an upper layer part 100 and a lower layer part 200. As one or more diffusion plates are stacked on the upper layer 100 and the lower layer 200, the optical member may include a plurality of diffusion plates. 5A through 5N, a plurality of diffusion plates 110, 110 ′, and 130 may be stacked on each of the upper layer portion 100 and the lower layer portion 200.

At this time, for example, the curved diffusion parts 115 and 135 formed on the diffusion plates 110, 110 ′ and 130 of the upper layer part 100 and the bending diffusion parts formed on the diffusion plates 110, 110 ′ and 130 of the lower layer part 200 are provided. The portions 115 and 135 may be identical to each other (see FIGS. 5A, 5B, 5F, 5G, and 5H) or may be different from each other (FIGS. 5C, 5D, 5E, 5I, 5J, and 5J). 5k, 5l, 5m, 5n). In addition, the curved diffusion parts 115 and 135 formed on the diffusion plates 110, 110 ′ and 13 of the upper layer part 100 and the curved diffusion parts 115 formed on the diffusion plates 110, 110 ′ and 130 of the lower layer part 200. And 135 are the same as each other, the directions in which the curved diffusions 115 and 135 are formed may be the same (see FIGS. 5F and 5G) or may be different from each other (see FIGS. 5A, 5B and 5H).

 Meanwhile, the upper layer part 100 and the lower layer part 200 may be integrally formed by the adhesion of the plurality of stacked diffusion plates 110, 110 ′, and 130. Here, the integrally formed means that the plurality of stacked diffusion plates 110, 110 ′ and 130 are formed as one body which is not easily separated by an external force.

Meanwhile, even when a plurality of diffusion plates 110, 110 ′ and 130 are stacked and integrally formed, separation may be caused by a strong external force. In this case, when the diffusion plates 110, 110 ′ and 130 are formed of a resin having adhesiveness, as described above, even when the plurality of stacked and bonded diffusion plates 110, 110 ′ and 130 are separated, the respective diffusion plates are separated. Since the adhesive force is maintained by the (110, 110 ', 130), the plurality of diffusion plates (110, 110', 130) can be easily re-bonded by applying a slight pressure, light irradiation or heat, semi-permanent Phosphorus life can be maintained.

5A to 5N illustrate various embodiments of the upper layer portion 100 and the lower layer portion 200 including the plurality of diffusion plates 110, 110 ′ and 130 as described above. Hereinafter, various embodiments of the upper layer part 100 and the lower layer part 200 according to the stacked structure of the plurality of diffusion plates 110, 110 ′ and 130 will be briefly described with reference to respective drawings. Meanwhile, the cross-sectional views illustrated in FIGS. 5A to 5N illustrate cross-sectional views based on respective diffusion plates illustrated in FIGS. 1, 3, and 4.

Referring to FIG. 5A, the upper layer part 100 includes one or more diffusion plates 110 having a concave diffusion part 115 formed on an upper side 111, and a concave diffusion part on a lower side 113 of the lower layer part 200. One or more diffusion plates 110 on which the portions 115 are formed may be provided in a stack.

Referring to FIG. 5B, the upper layer part 100 includes one or more diffusion plates 130 having convex diffusion parts 135 formed on the upper side 131, and the lower layer 200 convex diffusion on the lower side 133. One or more diffusion plates 130 on which the portions 135 are formed may be provided in a stack.

Referring to FIG. 5C, the upper layer part 100 includes one or more diffusion plates 110 having concave diffusion parts 115 formed on the upper side 111, and the lower layer part 200 convexly spreading on the upper side 131. One or more diffusion plates 130 on which the portions 135 are formed may be provided in a stack.

Referring to FIG. 5D, the upper layer part 100 includes one or more diffusion plates 110 having concave diffusion parts 115 formed on the upper side 111, and the lower layer part 200 convexly diffused on the lower side 133. One or more diffusion plates 130 on which the portions 135 are formed may be provided in a stack.

Referring to FIG. 5E, the upper layer portion 100 includes one or more diffusion plates 130 having convex diffusion portions 135 formed on the upper side 131, and the lower layer 200 concave diffusion on the upper side 111. One or more diffusion plates 130 on which the portions 115 are formed may be provided in a stack.

Referring to FIG. 5F, the upper layer portion 100 includes one or more diffusion plates 130 having convex diffusion portions 135 formed on the upper side 131, and the lower layer 200 convex diffusion on the upper side 131. One or more diffusion plates 130 on which the portions 135 are formed may be provided in a stack.

Referring to FIG. 5G, the upper layer portion 100 includes one or more diffusion plates 110 having the concave diffusion portion 115 formed on the upper side 111, and the lower layer 200 concave diffusion on the upper side 111. One or more diffusion plates 110 on which the portions 115 are formed may be provided in a stack.

Referring to FIG. 5H, at least one diffusion plate 110 having a concave diffusion portion 115 including a bead 117 is formed on the upper side portion 111, and the lower layer portion 200 has a lower layer portion 200. At least one diffusion plate 110 having a concave diffusion portion 115 having a bead 117 may be provided on the side surface 113.

Referring to FIG. 5I, the upper layer portion 100 includes one or more diffusion plates 110 having a concave diffusion portion 115 including the beads 117 formed on the upper side 111 and the lower layer portion 200. At least one diffusion plate 130 having a convex diffusion 135 formed on the side surface 133 may be provided in a stack.

Referring to FIG. 5J, one or more diffusion plates 110 including a concave diffusion part 115 including a bead 117 are formed on the upper side part 111, and the lower layer part 200 includes an upper layer part 100. At least one diffusion plate 130 having a convex diffusion 135 formed on the side surface 131 may be provided in a stack.

Referring to FIG. 5K, at least one diffusion plate 130 having a convex diffusion portion 135 is formed on the upper side 131, and the lower layer 200 has a bead on the upper side 111. One or more diffusion plates 110 including the concave diffusion portion 115 having the 117 may be stacked.

Referring to FIG. 5L, the upper layer part 100 includes one or more diffusion plates 110 having convex diffusion parts 135 formed on the upper side 131, and the lower layer part 200 having beads on the lower side 113. One or more diffusion plates 110 including the concave diffusion portion 115 having the 117 may be stacked.

Referring to FIG. 5M, one or more diffusion plates 130 having convex diffusion portions 135 are formed on the lower side 133, and the lower layer 200 has beads on the lower side 113. One or more diffusion plates 110 including the concave diffusion portion 115 having the 117 may be stacked.

Referring to FIG. 5N, at least one diffusion plate 110 having a concave diffusion part 115 including a bead 117 is formed on the lower side 113, and the lower layer part 200 has a lower layer part 200. At least one diffusion plate 130 having a convex diffusion 135 formed on the side surface 133 may be provided in a stack.

As such, when the plurality of diffusion plates 110, 110 ′ and 130 are stacked and the upper layer 100 and the lower layer 200 are formed, the plurality of diffusion plates 110, 110 ′ and 130 are set to be optical. Fabrication of the member can be facilitated, and since the plurality of diffusion plates 110, 110 ′ and 130 are stacked, light diffusion efficiency can be improved. In addition, as shown in the drawings, the upper layer portion 100 and the lower layer portion 200 may be provided as diffusion plates 110, 110 ', and 130 of different types, respectively, and the diffusion plates 110, 110', and 130 may be provided through a combination thereof. The diffusion efficiency of the light passing through it can be further improved.

5A to 5N, the optical member according to the exemplary embodiment of the present invention includes a base plate 140. The base plate 140 is provided between the upper layer part 100 and the lower layer part 200 of the plurality of diffusion plates 110 having a laminated structure. The base plate 140 may serve to support the upper layer part 100 and the lower layer part 200 in the manufacturing process of the optical member.

Looking at the manufacturing method of the optical member according to an embodiment of the present invention briefly, one or more diffusion plates (110, 110 ', 130) on one surface of the base plate 140 by sequentially stacked upper layer portion 100 After forming (the base plate 140 serves to support the stacked upper layer part 100), the upper layer part 100 and the base plate 140 are integrated, and then the base plate 140 is turned upside down and the base plate 140 is inverted. The lower layer 200 is formed by sequentially stacking one or more diffusion plates 110, 110 ′, and 130 on the other surface of the base layer (the base plate 140 supports the lower layer 200 to be stacked). By integrating the 200 and the base plate 140, the optical member according to an embodiment of the present invention can be provided.

In addition, the base plate 140 may be made of polymethymethacrylate (PMMA), PET, PE, and the like, which are acrylic resins.

In addition, although not shown in the drawing, the lowermost portion of the lower layer 200 may be provided with a light guide plate for converting the light incident from the light source into a uniform plane light. The light source may be provided at the side of the light guide plate or may be provided in a direct type at the rear portion of the light guide plate. Here, the light source mounted on the light guide plate may be, for example, a Cold Cathode Fluorescent Lamp (CCFL), a Light Emitting Diode (LED), an Electro Luminescent (EL), or the like.

On the other hand, it will be described below with respect to the optical member according to another embodiment of the present invention. However, the same reference numerals are used for the same or similar components as those of the optical member according to an embodiment of the present invention, and descriptions of overlapping configurations, functions, functions, effects, manufacturing methods, etc. will be briefly or omitted. .

6 is a cross-sectional view showing an optical member according to another embodiment of the present invention.

Prior to describing the optical member according to another embodiment of the present invention, the optical member according to another embodiment of the present invention is a diffusion plate (110, 110 ', 130) such as the optical member according to an embodiment of the present invention described above ) And an upper layer part 100 and a lower layer part 200 in which one or more diffusion plates 110, 110 ′ and 130 are stacked and provided. The description thereof will be omitted since it has been described in the optical member according to the exemplary embodiment of the present invention.

Referring to FIG. 6, the optical member according to the present invention may include a refractive plate 300. Referring to FIG. 6, the optical member may be provided by being stacked on the uppermost side of the plurality of diffusion plates 110 in which the refractive plate 300 is a stacked structure, and although not shown in the drawing, the refractive plate 300 may be provided. Like the diffusion plate 110, two or more may be stacked.

Since the refracting plate 300 must transmit light like the diffusion plate 110, the refractive plate 300 may be made of a transparent synthetic resin. For example, the synthetic resin may be polyethylene terephthalate (PET), methacryl resin, acrylic resin, polycarbonate (PC) resin, polyester resin, vinyl chloride resin, or the like.

In addition, the refraction plate 300 serves to refract light so that the light transmitted from the diffusion plate 110 is transmitted to the display panel, and a plurality of prisms that can refract light on the upper surface of the refraction plate 300. The part 310 may be formed.

The prism part 310 may be provided in plurality in a direction crossing the direction in which the refractive plates 300 are stacked. In addition, when a plurality of refraction plates 300 are stacked, the refraction plates 300 may be stacked so that the arrangement directions of the prism portions 310 cross each other.

Although not shown in the drawings, the surface of the prism portion 310 may be provided with a fine concave-convex portion that can adjust the brightness or transmittance.

Given that the vertex angle of the conventional prism portion 310 is 90 °, the plurality of prism portions 310 have a vertex angle smaller than 90 °, and for example, it may be designed to have a vertex angle of 80 ° or less. Can be. However, since too small a peak angle is difficult to manufacture, the peak angles of the plurality of prism portions 310 may be formed to be 30 ° or more.

Referring to FIG. 6, the optical member according to the present invention may include a base plate 140. The base plate 140 may be provided between the upper layer part 100 and the lower layer part 200 of the plurality of diffusion plates 110 having a stacked structure. In addition, the base plate 140 may be generally made of polymethymethacrylate (PMMA), PET, PE, or the like, which is an acrylic resin.

In addition, although not shown in the drawing, the lowermost portion of the lower layer 200 may be provided with a light guide plate for converting the light incident from the light source into a uniform plane light. The light source may be provided at the side of the light guide plate or may be provided in a direct type at the rear portion of the light guide plate. Here, the light source mounted on the light guide plate may be, for example, a Cold Cathode Fluorescent Lamp (CCFL), a Light Emitting Diode (LED), an Electro Luminescent (EL), or the like.

On the other hand, as described above, since the plurality of diffusion plates 110 are made of the diffusion plate 110 having adhesiveness, the refractive plate 300 and the plurality of diffusion plates stacked on the uppermost side of the plurality of diffusion plates 110 are provided. The base plate 400 provided to be stacked on the lowermost side of the 110 may be integrally formed by being bonded by the adhesiveness of the diffusion plate 110.

And even when the optical member according to the present invention is separated during use, the plurality of diffusion plates 110 may be re-bonded with each other by the property of the diffusion plate 110 which maintains adhesiveness. As such, the plurality of diffusion plates 110 and the refraction plate 300 or the base plate 400 may be rebonded with each other due to the adhesive material, and thus the life of the optical member may be semi-permanently extended as compared with the conventional art.

Meanwhile, in FIG. 6, a stacking structure of a plurality of diffusion plates 110 according to another embodiment of the present invention is illustrated as a stacking structure as shown in FIG. 5A, but this is merely exemplary and is not illustrated in the drawings. A stack structure of a plurality of diffusion plates according to another embodiment of the present invention may also be variously formed as a stack structure of a plurality of diffusion plates according to an embodiment of the present invention.

The optical member according to the exemplary embodiment of the present invention may maintain adhesiveness even after the diffusion plate is manufactured because the plurality of diffusion plates constituting the resin are formed of a resin having adhesiveness. In this way, if the adhesiveness is maintained, even if the optical member on which the plurality of diffusion plates are stacked is separated during use, the adhesiveness is maintained on the diffusion plate, so that the diffusion plate can be re-bonded by applying a predetermined pressure, thereby semi-permanently extending the life of the optical member. It can have an effect.

In addition, since the optical member according to an embodiment of the present invention is provided with a plurality of diffusion plates stacked, the diffusion region of the light passing through the diffusion plate becomes wider, so that the refractive plate may be omitted, and the optical plate is omitted by the omission of the refractive plate. It can be provided in a compact, thereby the effect that the liquid crystal display device can be provided more slim.

On the other hand, in the optical member according to another embodiment of the present invention, when the plurality of diffusion plates and the refractive plate or the base plate are provided, the plurality of diffusion plates and the refractive plate or the base plate are integrally manufactured by the adhesion of the diffusion plate. Light leakage phenomenon of the liquid crystal display device can be prevented from occurring.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

10: resin 100: upper layer
200: lower floor
110, 110 ', 130: diffusion plate
111, 131: upper side 113, 133: lower side
115: concave diffusion 117: bead
135: convex diffusion 300: refractive plate
140: base plate

Claims (11)

In the optical member,
Base plate;
An upper layer part provided on an upper side of the base plate; And
Including a lower layer provided on the lower side of the base plate,
Each of the upper layer and the lower layer includes a diffusion plate having a plurality of curved diffusions that are bent on at least one of the upper and lower surfaces to diffuse light,
The base plate, the upper layer and the lower layer is integrally formed,
The plurality of curved diffusions are formed curved in the form of intaglio,
The curved surface of the curved diffusion portion in the form of the intaglio is provided with a bead for scattering light passing through the curved diffusion portion. The method of claim 1,
The diffusion plate is one or more laminated to each of the upper layer and the lower layer. The method of claim 1,
The optical member further comprises one or more refractive plates stacked on the upper layer. The method of claim 1,
The diffusion plate is formed of an adhesive resin,
The base plate, the upper layer portion, and the lower layer portion is formed integrally by the adhesive. 5. The method of claim 4,
The resin is an optical member which is a photocurable resin or a thermosetting resin having adhesiveness even in a cured state. delete The method of claim 1,
The plurality of curved diffusions formed on any one of the upper side and the lower side of the diffusion plate is formed to be bent equal to each other. delete delete The method of claim 1,
The curved diffusion portion of the diffusion plate stacked on the lower layer portion is formed on one of the upper side and the lower side,
The curved diffusion portion of the diffusion plate stacked on the upper layer portion is formed on the other side of the upper side and the lower side. The method of claim 3,
The refractive plate is a plurality of prism portion is formed on the upper side,
When the plurality of refractive plates are stacked, the plurality of prism portions of the upper refractive plate and the plurality of prism portions of the lower refractive plate are formed to cross each other.

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