KR101137796B1 - Optical element and method of manufacture - Google Patents

Abstract

PURPOSE: An optical member and a manufacturing method thereof are provided to enable the integration of a diffusion plate and a refraction plate since the diffusion plate adheres to the refraction plate which can improve brightness. CONSTITUTION: An optical member comprises a light guide plate(110), a diffusion plate(130), and a refraction plate(150). The diffusion plate is formed on the upper part of the light guide plate. The refraction plate is formed on the upper part of the diffusion plate. The light guide plate, the diffusion plate, and the refraction plate are integrated with each other.

Description

Optical member and its manufacturing method {OPTICAL ELEMENT AND METHOD OF MANUFACTURE}

The present invention relates to an optical member and a method for manufacturing the same, and more particularly, to an optical member and a method for manufacturing the same used in a liquid crystal display device.

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, light leakage may occur in the liquid crystal display panel, or the light may not be properly refracted to the liquid crystal display panel, thereby narrowing the viewing angle or causing 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-mentioned problems of the prior art, and an object thereof is to diffuse a diffuser plate for diffusing light generated from a light source to a liquid crystal display panel, thereby adhering the diffused plate to a refracting plate to improve luminance, and to diffuse the plate. And an optical member in which the refractive plate is integrally formed, and a method of manufacturing the same.

According to the present invention for achieving the above object, a base plate or a light guide plate; A refractive plate having a plurality of prisms formed thereon; And a surface disposed between the base plate and the refractive plate or between the light guide plate and the refractive plate, and in contact with the base plate or in contact with the light guide plate to diffuse light transmitted from the base plate or the light guide plate, and the refraction. A plurality of diffusion parts are formed on a surface in contact with the plate, and the diffusion plate attaches the base plate or the light guide plate to the refractive plate, and the base plate or the light guide plate, the refractive plate and the diffusion plate are integrally formed. It provides an optical member.

According to the present invention for achieving the above object, a) manufacturing a diffusion plate formed with a plurality of diffusion parts on the upper / lower surfaces; b) preparing a base plate or light guide plate; c) preparing a refractive plate on which a plurality of prism portions are formed; d) providing the diffusion plate on an upper surface of the base plate or the light guide plate; e) providing said refractive plate on an upper surface of said diffusion plate; And f) irradiating ultraviolet rays to the diffusion plate to adhere the base plate or the light guide plate and the refractive plate to the optical member.

The present invention provides an optical member in which a diffusion plate and a refraction plate are integrally formed by adhering a diffusion plate for diffusing light generated from a light source to be refracted by a liquid crystal display panel to improve brightness, thereby forming a diffusion plate and a refraction plate integrally. can do.

1 is a perspective view of an optical member according to a first embodiment of the present invention.
2 is a cross-sectional view of the optical member according to FIG. 1.
3 is a cross-sectional view of the diffusion plate according to FIG. 1.
4A and 4B are perspective views showing only one side surface according to various embodiments of the diffusion plate.
5 is a block diagram showing a manufacturing process of the optical member according to the first embodiment of the present invention.
6 to 8 are cross-sectional views illustrating an optical member manufacturing process according to FIG. 5.
9 is a sectional view of an optical member according to a second embodiment of the present invention.
10 is a block diagram showing a manufacturing process of the optical member according to the second embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. 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 . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

First, prior to describing the present invention, the optical member according to the present invention may be applied to all light receiving display devices such as an electrophoretic display device as well as a liquid crystal display (LCD).

1 is a perspective view of an optical member according to the present invention, FIG. 2 is a sectional view of the optical member according to FIG. 1, FIG. 3 is a sectional view of the diffusion plate according to FIG. 1, and FIGS. 4A and 4B show various implementations of the diffusion plate. Only one side according to the example is a perspective view shown.

First, referring to FIG. 1, an optical member according to a first embodiment of the present invention may include a light guide plate 110, a diffusion plate 130 provided on an upper side of the light guide plate 110, and an upper side of the diffusion plate 130. Including a refractive plate 150 provided, the light guide plate 110, the diffusion plate 130 and the refractive plate 150 is integrally formed.

Here, the integrally formed means that the light guide plate 110, the diffusion plate 130, and the refraction plate 150 are formed as one body so as not to be separated by an external force.

The light guide plate 110 is a component that converts light incident from the lamp 115 into uniform plane light, and is generally made of PMMA (polymethymethacrylate), which is an acrylic resin.

1 and 2, the lamp 115 is illustrated as being provided on the side surface of the light guide plate 110. The position of the lamp 115 may be provided at various positions without being limited thereto.

In particular, as in the present exemplary embodiment, the lamp 115 may be provided in a direct type behind the light guide plate 110 except for the case where the lamp 115 is provided on the side surface of the light guide plate 110.

The lamp 115 mounted on the light guide plate 110 may include a Cold Cathode Fluorescent Lamp (CCFL), a Light Emitting Diode (LED), and an Electro Luminescent (EL).

The diffusion plate 130 serves to diffuse and transmit the light transmitted through the base plate 110 to the refractive plate 150 and is provided between the base plate 110 and the refractive plate 150. It also serves to adhere to the base plate 110 and the refractive plate 150.

Therefore, the diffusion plate 130 is made of an ultraviolet curable resin that is tacky, transparent, and cured by ultraviolet (UV).

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.

However, the diffusion plate 130 may be formed of an adhesive resin in addition to the adhesive resin, and may be cured by an infrared ray (IR) or a heat dryer (Dryer) in addition to the ultraviolet ray.

The diffusion plate 130 includes a first adhesive surface 131 and a second adhesive surface 133 spaced apart from the first adhesive surface 131.

The first adhesive surface 131 and the second adhesive surface 133 of the diffusion plate 130 have a plurality of diffusion parts 135 spaced apart from each other so that light transmitted through the light guide plate 110 is diffused to the refractive plate 150. Is formed.

The first adhesive surface 131 and the light guide plate 110, the second adhesive surface 133, and the refractive plate 150 may be adhered between the plurality of diffusion parts 135 spaced apart from each other. 131a and 133a are formed.

The plurality of diffusions 135 are recessed in a direction from the first adhesive surface 131 to the second adhesive surface 133 and in a direction from the second adhesive surface 133 toward the first adhesive surface 131. It is formed in a groove shape and is formed along the z-axis longitudinal direction when referring to the coordinates shown in FIG. 1.

The plurality of diffusion parts 135 may be formed in a hemispherical shape or a tunnel shape as shown in FIGS. 4A and 4B.

In addition, when the plurality of diffusion parts 135 are formed in a tunnel shape, they may be formed in various shapes such as an arc shape, a quadrangle, and an inverted triangle.

Meanwhile, as shown in FIG. 7B, when the diffusion part 135 is formed in the shape of a hemisphere, a semicircle, or an arc, an angle θ formed between the second adhesive surface 133 and the virtual axis X shown in the drawing is It consists of a value between 10˚ and 170˚.

Here, the imaginary axis X is an axis intersecting with the center C of the diffusion part 135 at the point A where the diffusion part 135 and the second adhesive surface 133 contact each other, as shown in FIG. 8B. Becomes

The diffusion part 135 has a deeper depth as the value of the angle θ formed by the second adhesive surface 133 and the virtual axis X is increased, and the second adhesive surface 133 and the virtual axis ( The smaller the value of the angle θ formed by X), the shallower the depth.

In addition, in the first embodiment, the diffusion part 135 is formed on the first adhesive surface 131 and the second adhesive surface 133, but need not be limited thereto, and the first adhesive surface 131 and the second adhesive surface ( It may be formed between the surface on any one side of the 133, or between the first adhesive surface 131 and the second adhesive surface 133.

On the other hand, the diffusion plate 130 is manufactured using the mold 200, the mold 200 is provided in a pair provided up / down.

The mold 200 has a plurality of protrusions 210 spaced apart from each other on one side on which the resin 130 is coated.

The plurality of protrusions 210 correspond to the plurality of diffusion parts 135 formed on the first adhesive surface 131 and the second adhesive surface 133 of the diffusion plate 130, and in the first embodiment, the x-axis direction The cross section of the furnace is formed as a hemisphere in the shape of a semicircle.

However, as shown in FIG. 4B, since the plurality of diffusion parts 135 may be formed in a tunnel shape, the protrusion part 210 may also be formed in a shape corresponding to the tunnel diffusion part 135.

The refractive plate 150 includes a first surface 151 contacting the second adhesive surface 133 of the diffusion plate 130, and a second surface 153 spaced apart from the first surface 151.

The refracting plate 150 is made of a transparent synthetic resin.

For example, synthetic resins include polyethylene terephthalate (PET), methacryl resins, acrylic resins, polycarbonate (PC) resins, polyester resins, vinyl chloride resins, and the like.

In the first embodiment, the refractive plate 150 is made of at least one of transparent polyethylene terephthalate (PET) or polycarbonate (PC).

The refraction plate 150 serves to refract the light so that the light transmitted from the diffusion plate 130 is transmitted to the display panel. The refraction plate 150 may refract light to the second adhesive surface 153 of the refraction plate 150. A plurality of prism portions 155 are formed.

As illustrated in FIG. 1, a plurality of prism units 155 are formed along the z-axis length direction when referring to the coordinates illustrated in FIG. 1.

In the first embodiment, the prism portion 155 has a triangular cross section in the x-axis direction. However, the shape of the prism portion 155 need not be limited to a triangular shape, and may be formed in various shapes.

In addition, the surface of the prism portion 155 may include a fine concave-convex portion that can adjust the brightness or transmittance.

In view of the fact that the vertex angle of the conventional prism portion 155 is 90 degrees, the plurality of prism portions 155 preferably have a vertex angle smaller than 90 degrees, and more preferably have a vertex angle of 80 degrees or less. Can be designed.

However, since too small a peak angle is difficult to manufacture, the peak angles of the plurality of prism portions 155 are formed to be 30 ° or more.

5 is a block diagram illustrating a manufacturing process of the optical member according to the present invention, and FIGS. 6 to 8 are cross-sectional views illustrating a manufacturing process of the optical member according to FIG. 5.

First, as illustrated in FIG. 7, a transparent resin is coated between a pair of molds 200 to manufacture the diffusion plate 130 (step S305).

In this case, the resin 130 ′ coated between the pair of molds 200 uses ultraviolet curable resin that is cured when irradiated with ultraviolet rays.

After the resin 130 is coated between the pair of molds 200, the resin 130 'is irradiated with ultraviolet rays to semi-harden the resin to complete the manufacture of the diffusion plate 130 (step S310).

On the other hand, the reason to make the resin semi-cured is because the resin used in the manufacture of the diffusion plate 130 is an adhesive material, if the resin is completely cured, the mold 200 may adhere to the mold 200, so that the resin is semi-cured. will be.

After fabrication of the diffusion plate 130 is completed, the diffusion plate 130 is separated from the pair of molds 200 (step S315).

When the diffusion plate 130 is separated from the pair of molds 200, the first adhesive surface 131 and the second adhesive surface of the diffusion plate 130 are formed by the protrusions 210 of the pair of molds 200. A diffuser 135 having a shape corresponding to the protrusion 210 is formed at 133, and portions 131a and 133a, which are adhered to the refractive plate 150, are formed between the diffuser 135.

Then, the light guide plate 110 and the refracting plate 150 on which the lamp 115 is mounted are prepared, respectively. (Step S320 and Step S325)

On the other hand, the refractive plate 150 is made of a PET material.

The diffusion plate 130 is provided on the upper surface 113 of the light guide plate 110.

When the diffusion plate 130 is provided on the light guide plate 110, the refractive plate 150 is provided on the diffusion plate 130. (S330 and S335).

At this time, the first surface 151 of the refractive plate 150 is in contact with the portion 133a where the adhesion is formed between the second adhesion surface 133 and the diffusion portion 135 of the diffusion plate 130.

When the light guide plate 110, the diffusion plate 130, and the refracting plate 150 are sequentially stacked, ultraviolet rays are irradiated onto the three plates 110, 130, and 150.

In this step, the semi-cured diffusion plate 130 is adhered to the light guide plate 110 and the refracting plate 150 while being completely cured by ultraviolet (UV) radiation.

Therefore, the light guide plate 110, the diffusion plate 130, and the refractive plate 150 are adhered by the diffusion plate 130 to be integrally formed and completed.

Since the optical member as the first embodiment of the present invention manufactures the diffusion plate 130 using adhesive resin, the optical member in which the diffusion plate 130 and the refractive plate 150 are integrally formed when the optical member is manufactured. Can be produced with

Therefore, rather than separately preparing the diffusion plate 130 and the refractive plate 150 and combining them in the assembly process of the liquid crystal display device of the liquid crystal display device using the optical member formed integrally with the diffusion plate 130 and the refractive plate 150 The assembly can be produced quickly, saving time and cost.

In addition, since the diffusion plate 130 is integrally manufactured by attaching the diffusion plate 130 to the refractive plate 150 using an adhesive resin, the diffusion plate 130 and the refractive plate 150 may be used even when the liquid crystal display device has a long service life. Since is not separated, an effect of preventing light leakage and the like of the liquid crystal display device can be obtained.

On the other hand, Figure 10 is a cross-sectional view showing a second embodiment of the optical member according to the present invention.

The optical member according to the second embodiment includes a base plate 210, a refractive plate 250 having a plurality of prism portions 255 formed therebetween, and a base plate 210 between the base plate 210 and the refractive plate 250. A plurality of diffusers 235 are formed on a surface in contact with the base plate 210 and a surface in contact with the refracting plate 250 to diffuse light transmitted from the base plate 210, and the base plate 210 and the refracting plate. Diffusion plate 230 to adhere 250.

The base plate 210, the refracting plate 250, and the diffusion plate 230 are integrally formed by the diffusion plate 230.

The second embodiment uses the base plate 210 instead of the light guide plate 110 as compared with the first embodiment. The diffusion plate 230 and the refraction plate 250 other than the base plate 210 are different from the first embodiment. Since it is the same, a description thereof will be omitted.

The base plate 210 has a lower surface and an upper surface spaced apart from the lower surface.

The base plate 210 is made of synthetic resin, for example, polyethylene terephthalate (PET), methacryl resin, acrylic resin, polycarbonate resin, polyester resin, or vinyl chloride resin.

The base plate 210 in the second embodiment is made of a PET material, and the light emitted from the light source is made of transparent PET so that the light is transmitted to the diffusion plate 230 and the refractive plate 250.

On the other hand, the base plate 210 also serves to support easy control and handling (handling) when the base plate 210, the diffusion plate 230 and the refracting plate 250 is integrally manufactured.

11 is a block diagram showing a manufacturing process of the optical member according to the second embodiment of the present invention.

Briefly looking at the manufacturing process of the optical member according to the second embodiment with reference to Figure 10, after coating a transparent resin on a pair of mold, and then irradiated with ultraviolet rays to semi-cured transparent resin, thereby semi-transparent The resin is made of the diffusion plate 230.

Once the diffusion plate 230 is fabricated, the semi-radiated diffusion plate 230 is separated from the pair of molds.

The base plate 210 and the refractive plate 250 are prepared.

When the base plate 210 is prepared, the diffusion plate 230 is provided above the base plate 210, and the refractive plate 250 is provided above the diffusion plate 230.

Subsequently, ultraviolet rays are irradiated to the base plate 210, the diffusion plate 230, and the refraction plate 250, which are sequentially stacked.

At this time. The diffusion plate 230 is cured by the ultraviolet rays irradiated and adhered to the base plate 210 and the refractive plate 250 to complete an integrated optical member.

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 type may be implemented in a distributed manner, and similarly, components described as distributed may 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.

110: light guide plate 115: lamp
130: diffusion plate
131: first adhesive surface 133: second adhesive surface
131a and 133a: part where adhesion is made 135: diffusion part
150: refractive plate 151: first side
153: Second Scene 155: Prism Section
210: base plate

Claims (18)

delete delete delete delete delete delete delete delete In the optical member manufacturing method,
a) manufacturing a semi-radius diffuser plate with a plurality of diffusers formed on upper and lower surfaces thereof;
b) preparing a base plate or light guide plate;
c) preparing a refractive plate on which a plurality of prism portions are formed;
d) providing the diffusion plate on an upper surface of the base plate or the light guide plate;
e) providing said refractive plate on an upper surface of said diffusion plate; And
f) completely curing the diffuser plate through any one of ultraviolet radiation, infrared radiation, and a heat dryer such that the diffuser plate is integrally formed with the base plate or light guide plate and the refracting plate,
The step a)
a-1) coating a curable transparent resin between a pair of molds having a plurality of protrusions corresponding to the plurality of diffusions;
a-2) semi-curing the resin through any one of ultraviolet radiation, infrared radiation, and heat dryer; And
a-3) separating the diffusion plate formed by semi-curing the resin from the pair of molds. delete delete delete delete delete The method of claim 9,
The plurality of diffusion parts are formed concave in the shape of a hemisphere. The method of claim 9,
The plurality of diffusion parts are formed concave in a tunnel form optical member manufacturing method. The method of claim 9,
The method of manufacturing an optical member in which the plurality of diffusion parts are formed in the form of any one of a semicircle, arc, square, and inverted triangle in cross section. The method of claim 9,
The base plate and the refractive plate is an optical member manufacturing method comprising at least one of polyethylene terephthalate (PET) or polycarbonate (PC).

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