WO2012153891A1

WO2012153891A1 - Optical member and method for manufacturing same

Info

Publication number: WO2012153891A1
Application number: PCT/KR2011/005107
Authority: WO
Inventors: 이대환; 서광석; 김종은
Original assignee: 주식회사 앤앤드에프
Priority date: 2011-05-06
Filing date: 2011-07-12
Publication date: 2012-11-15
Also published as: KR101137790B1

Abstract

The present invention relates to an optical member and a method for manufacturing the optical member, the optical member comprising: a base plate; a refraction plate having a plurality of prism parts formed thereon; and a diffusion plate provided between the base plate and the refraction plate, for diffusing a light delivered from the base plate, and for adhering the base plate and the refraction plate, wherein the base plate, the refraction plate, and the diffusion plate are formed integratingly, and the diffusion plate and the refraction plate are formed in a single body, the diffusion plate for diffusing the light generated from a light source being adhered to the refraction plate for enhancing the luminance by refracting the diffused light to a liquid crystal display panel.

Description

Optical member and manufacturing method thereof

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; A refractive plate having a plurality of prisms formed thereon; And a diffusion plate disposed between the base plate and the refractive plate and diffusing light transmitted from the base plate, and adhering the base plate and the refractive plate to each other, wherein the base plate, the refractive plate, and the diffusion plate are provided. The plate provides an optical member formed integrally.

Here, the diffusion plate may include a plurality of air tunnels for diffusing light toward the refracting plate on the surface in contact with the base plate or the refracting plate.

The diffusion plate may be formed of an ultraviolet curable transparent resin cured by ultraviolet rays.

The plurality of air tunnels may be formed in the form of any one of a semicircle, arc, square, and inverted triangle in cross section.

The base plate and the refractive plate may be made of at least one material of polyethylene terephthalate (PET) or polycarbonate (PC).

According to the present invention for achieving the above object, a light guide plate that can be mounted lamp; A refractive plate having a plurality of prisms formed thereon; And a diffusion plate disposed between the light guide plate and the refractive plate to diffuse light transmitted from the light guide plate and to adhere the light guide plate to the refractive plate, wherein the light guide plate, the refractive plate, and the diffusion plate are integrally formed. It provides an optical member formed.

Here, the diffusion plate may include a plurality of air tunnels to diffuse light toward the refractive plate on the surface in contact with the light guide plate or the refractive plate.

The lamp may be provided with at least one of a cold cathode fluorescent lamp (CCFL), a light emitting diode (LED), and an organic electroluminescence (EL).

According to the present invention for achieving the above object, a) manufacturing a diffusion plate formed with a plurality of air tunnel on the surface; 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 and adhering the base plate or the light guide plate and the refractive plate to each other.

Here, the diffusion plate may be manufactured by a mold.

The diffusion plate may be made of UV curable transparent resin.

Step a) comprises the steps of: a-1) coating the UV curable transparent resin on top of the mold formed corresponding to the air tunnel; a-2) semi-curing the ultraviolet curable transparent resin by irradiating the ultraviolet curable transparent resin with ultraviolet rays; And a-3) separating the semi-cured diffusion plate from the mold.

A plurality of protrusions corresponding to the plurality of air tunnels may be formed on the mold.

The base plate and the refractive plate may be made of at least one of polyethylene terephthalate (PET) or polycarbonate (PC).

The light guide plate may be equipped with a lamp for injecting light into the diffusion plate.

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.

4 is a cross-sectional view of the refractive plate according to FIG. 1.

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. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. 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 "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element 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 FIG. 4 is a sectional view of the refractive plate according to FIG. 1. to be.

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

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

The base plate 110 has a lower surface 111 and an upper surface 113 spaced apart from the lower surface 111.

The base plate 110 is made of a synthetic resin, for example, polyethylene terephthalate (PET), methacryl resin, acrylic resin, polycarbonate resin, polyester resin, vinyl chloride resin of at least one synthetic resin.

The base plate 110 in the first embodiment is made of a PET material, the light emitted from the light source is made of transparent PET so that the light can be transmitted to the diffusion plate 130 and the refracting plate 150.

On the other hand, the base plate 110 also serves to support the control and handling (handling) is easily made when the base plate 110, the diffusion plate 130 and the refracting plate 150 is integrally manufactured.

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.

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

A plurality of air tunnels 135 spaced apart from each other are formed on the second adhesive surface 133 of the diffusion plate 130 to diffuse light transmitted through the base plate 110 to the refractive plate 150.

In addition, a portion 133a in which adhesion between the second adhesive surface 133 of the diffusion plate 135 and the refractive plate 150 is formed between the plurality of air tunnels 135 spaced apart from each other.

The plurality of air tunnels 135 are formed in a recessed shape in a direction from the second adhesive surface 133 toward the first adhesive surface 131, and the z-axis longitudinal direction is referred to when referring to the coordinates illustrated in FIG. 1. Formed accordingly.

In the first embodiment, the air tunnel 135 has a semicircular cross section in the x-axis direction. However, the shape of the air tunnel 135 need not be limited thereto, and may be formed in various shapes such as an arc shape, a rectangle, and an inverted triangle.

Meanwhile, as shown in FIG. 7B, when the air tunnel 135 is formed in a semicircle or arc shape, an angle θ formed between the first adhesive surface 131 and the virtual axis X shown in the drawing is 10 °. It consists of a value between ~ 170˚.

Here, the virtual axis X is an axis intersecting with the center C of the air tunnel 135 at a point A where the air tunnel 135 and the first adhesive surface 131 contact each other, as shown in FIG. 7B. Becomes

The air tunnel 135 has a deeper depth as the value of the angle θ formed by the first adhesive surface 131 and the virtual axis X increases, and the first adhesive surface 131 and the virtual shaft ( The smaller the value of the angle θ formed by X), the shallower the depth.

In addition, although the air tunnel 135 is formed in the second adhesive surface 133 in the first embodiment, the first adhesive surface 131 or the first adhesive surface 131 and the second adhesive surface ( 133 may be formed between.

Meanwhile, the diffusion plate 130 is manufactured using the mold 200.

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

The plurality of protrusions 210 correspond to the plurality of air tunnels 135 formed on the second adhesive surface 133 of the diffusion plate 130. In the first embodiment, the cross section in the x-axis direction is formed in a semicircular shape. do.

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 refractive plate 150 and the base plate 110 are 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 and the base plate 110 are made of at least one material 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, a step of coating a transparent resin on the mold 200 to produce a diffusion plate 130 is made (step S305).

In this case, the resin 130 ′ coated on the mold 200 uses an ultraviolet curable resin that is cured when irradiated with ultraviolet rays.

After the resin is coated on the mold 200, the resin 130 'is irradiated with ultraviolet rays to semi-harden the resin, thereby completing the fabrication 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 mold 200 (step S315).

When the diffusion plate 130 is separated from the mold 200, air having a shape corresponding to the protrusion 210 is formed on the second adhesive surface 133 of the diffusion plate 130 by the protrusion 210 of the mold 200. The tunnel 135 is formed, and the portion 133a on which the refractive plate 150 and the adhesion are formed is formed between the air tunnels 135.

Then, the base plate 110 and the refractive plate 150 are prepared, respectively. (S320 and S325)

The base plate 110 is made of a PET material, and is prepared to facilitate the control and handling of the diffusion plate 130 and the refractive plate 150 when the optical member is manufactured.

The refractive plate 150 is made of the same PET material as the base plate 110.

The diffusion plate 130 is provided on the upper surface 113 of the base plate 110 (step S330), and the first adhesive surface 131 of the diffusion plate 130 is provided to contact the upper surface 113.

That is, when the diffusion plate 130 is manufactured and provided on the base plate 110, the positions of the first adhesive surface 131 and the second adhesive surface 133 are reversed.

This can be seen with reference to FIGS. 6 and 7. As shown in FIG. 6, when the diffusion plate 130 is manufactured, the second adhesive surface 133 is positioned below the first adhesive surface 131. .

However, as shown in FIG. 7, when the diffusion plate 130 is provided on the base plate 110, the first adhesive surface 131 is disposed below the second adhesive surface 133.

When the diffusion plate 130 is provided on the base plate 110, the refractive plate 150 is provided on the diffusion plate 130 (step S335).

In this case, the first surface 151 of the refractive plate 150 is in contact with the second adhesive surface 133 of the diffusion plate 130, but the portion 133a on which the second adhesive surface 133 is adhered is substantially formed. It is in contact with.

When the base 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 (step S340).

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

The base 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 In addition, since the diffusion plate 130 itself is adhesive, it is not necessary to form a separate adhesive layer or coating layer between the diffusion plate 130 and the base plate 110 or the refractive plate 150, the manufacturing process is simplified As a result, the optical member can be formed thin.

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.

9 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 light guide plate 210 to which a lamp 211 can be mounted, a refractive plate 250 having a plurality of prism portions 255 formed thereon, a light guide plate 210 and a refractive plate 250. The diffusion plate 230 is disposed between the light guide plate 210 and diffuses the light transmitted from the light guide plate 210, and adheres the light guide plate 210 to the refractive plate 250.

The light guide plate 210, the refractive plate 250, and the diffusion plate 230 are integrally formed by the diffusion plate 230.

Here, the light guide plate 210 is a component that converts light incident from the lamp 211 into uniform plane light, and is generally made of PMMA (polymethymethacrylate), which is an acrylic resin.

9, the lamp 211 is illustrated as being provided on the side surface of the light guide plate 210. The location of the lamp 211 may be provided at various positions without being limited thereto.

The type of lamp 211 mounted on the light guide plate 210 may include a Cold Cathode Fluorescent Lamp (CCFL), a Light Emitting Diode (LED), and an Electro Luminescent (EL).

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

Referring briefly to the manufacturing process of the optical member according to the second embodiment with reference to Figure 10, after coating the transparent resin on the mold, and then irradiated with ultraviolet rays to semi-transparent transparent resin, the semi-cured transparent resin is thereby spread It is made of a plate 230.

Once the diffusion plate 230 is fabricated, the semi-radiated diffusion plate 230 is separated from the mold.

Then, the light guide plate 210 and the refracting plate 250 in which the lamp 211 is mounted are prepared.

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

Subsequently, ultraviolet rays are irradiated onto the light guide 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 light guide plate 210 and the refractive plate 250 to complete an integrated optical member.

In the optical member as in the second embodiment, the light guide plate, the diffusion plate, and the refractive plate are integrally formed by the diffusion plate made of the transparent resin as in the first embodiment. In addition, since the diffusion plate and the refractive plate or the light guide plate do not need to form a separate adhesive layer or coating layer therebetween, the manufacturing process can be simplified and the cost can be reduced. In particular, since the diffuser plate is integrally formed directly on the light guide plate, a separate base plate for controlling and handling the diffuser plate is unnecessary, and thus an optical member having a more compact and simple structure can be formed.

That is, since one plate for transmitting the light transmitted from the light guide plate to the diffusion plate is omitted, an effect of thinning the thickness can be obtained. Therefore, the optical member in which the light guide plate, the diffusion plate, and the refraction plate are integrally formed may correspond to the tendency of the thickness of the liquid crystal display device to become slim recently.

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. Therefore, it should be understood that the embodiments described above are exemplary in all respects 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.

Claims

In the optical member,

Base plate;

A refractive plate having a plurality of prisms formed thereon; And

A diffusion plate provided between the base plate and the refracting plate and diffusing light transmitted from the base plate and adhering the base plate and the refracting plate,

The base plate, the refractive plate and the diffusion plate is formed integrally.
The method of claim 1,

The diffusion plate,

And a plurality of air tunnels on a surface in contact with the base plate or the refracting plate to diffuse light toward the refracting plate.
The method of claim 1,

The diffusion plate is formed of an ultraviolet curable transparent resin cured by ultraviolet light.
The method of claim 1,

The plurality of air tunnels are optical members having a cross section in the form of any one of a semi-circle, arc, square and inverted triangle.
The method of claim 1,

The base plate and the refractive plate is an optical member made of at least one material of polyethylene terephthalate (PET) or polycarbonate (PC).
In the optical member,

A light guide plate to which a lamp can be mounted;

A refractive plate having a plurality of prisms formed thereon; And

A diffusion plate disposed between the light guide plate and the refraction plate to diffuse light transmitted from the light guide plate, and to adhere the light guide plate to the refraction plate,

The light guide plate, the refractive plate and the diffusion plate are integrally formed.
The method of claim 6,

The diffusion plate,

And a plurality of air tunnels on a surface in contact with the light guide plate or the refracting plate to diffuse light toward the refracting plate.
The method of claim 7, wherein

The plurality of air tunnels are optical members, the cross section is formed in any one of the shape of a semi-circle, arc, square and inverted triangle.
The method of claim 6,

The lamp is provided with at least one of a cold cathode fluorescent lamp (CCFL), a light emitting diode (LED) and an organic electroluminescence (EL).
In the optical member manufacturing method,

a) manufacturing a diffusion plate having a plurality of air tunnels formed on a surface 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) irradiating ultraviolet rays to the diffusion plate and adhering to the base plate or the light guide plate and the refractive plate.
The method of claim 10,

The diffusion plate is an optical member manufacturing method produced by the mold.
The method of claim 10,

The diffusion plate is an optical member manufacturing method consisting of ultraviolet curable transparent resin.
The method of claim 10,

Step a) is

a-1) coating the UV curable transparent resin on an upper portion of the mold formed to correspond to the air tunnel;

a-2) semi-curing the ultraviolet curable transparent resin by irradiating the ultraviolet curable transparent resin with ultraviolet rays; And

a-3) separating the semi-radiated diffusion plate from the mold.
The method of claim 13,

And a plurality of protrusions corresponding to the plurality of air tunnels is formed on the mold.
The method of claim 10,

The plurality of air tunnel has a cross-section optical member manufacturing method formed in any one of the shape of a semi-circle, arc, square and inverted triangle
The method of claim 10,

The base plate and the refractive plate is an optical member manufacturing method comprising at least one of polyethylene terephthalate (PET) or polycarbonate (PC).
The method of claim 10,

And the light guide plate is mounted with a lamp for injecting light into the diffusion plate.
The method of claim 17,

The lamp is provided with at least one of a cold cathode fluorescent lamp (CCFL), a light emitting diode (LED) and an organic electroluminescence (EL).