KR100787913B1 - Back light unit and method for forming light guide panel of the same - Google Patents

Abstract

A backlight unit and a method for manufacturing a light guiding plate of the backlight unit are provided to form the light guiding plate of UV resin to simplify the manufacturing process of the light guiding plate and improve the productivity of the light guiding plate. A backlight unit(100) comprises a light emitting part(110) for emitting light, and a light guiding plate(120) for receiving the light and outputting the light through a surface. The light guiding plate is formed by curing UV resin. The light guiding plate includes a main body(121) having a light incident portion(121a), to which the light is incident, a light output surface, and a reflection pattern(121c) formed on the main body in a single body.

Description

Back light unit and method for forming light guide panel of the same}

1 is a cross-sectional view schematically showing the configuration of a conventional backlight unit;

2 is a cross-sectional view schematically showing one embodiment of a backlight unit according to the present invention;

3 is a perspective view illustrating a light guide plate of the backlight unit illustrated in FIG. 2;

4A and 4B are perspective and cross-sectional views showing one embodiment of an apparatus for manufacturing a light guide plate of the backlight unit shown in FIG.

5 is a cross-sectional view illustrating a process of curing the light guide plate of the backlight unit illustrated in FIG. 2;

FIG. 6 is a perspective view showing another embodiment of an apparatus for manufacturing a light guide plate of the backlight unit shown in FIG. 2; FIG.

7 is a cross-sectional view schematically showing another embodiment of a backlight unit according to the present invention;

8 is a perspective view illustrating a light guide plate of the backlight unit illustrated in FIG. 7;

9 is a perspective view showing an embodiment of an apparatus for manufacturing a light guide plate of the backlight unit shown in FIG.

10 is a plan view showing a keypad of a mobile phone which is an embodiment of a target to which a backlight unit according to the present invention is applied;

11 is a flowchart illustrating an embodiment of a method of manufacturing a light guide plate of a backlight unit according to the present invention;

12 is a flowchart illustrating another embodiment of a method of manufacturing a light guide plate of a backlight unit according to the present invention;

Explanation of symbols on the main parts of the drawings

100, 500: backlight unit 110, 510: light emitting unit

120, 520: Light guide plate 121: Light guide plate body

121a: light-receiving part 121b: exit face

121c: serration pattern 122: reflection pattern

210, 310, 610: lower body 220, 320, 620: upper body

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit for surface light emission, and more particularly, to a backlight unit that is easy to manufacture and has improved productivity.

In general, the backlight unit is a device that is applied to the light emitting for image display of a liquid crystal display (hereinafter referred to as LCD) and keypad lighting of a mobile phone.

Here, the LCD is a device for displaying an image according to the video signal by adjusting the light transmittance of the liquid crystal cells arranged in a matrix form as a video signal, comprising a liquid crystal panel, a backlight unit and a black matrix layer. Since the configuration of the LCD is generally known, an additional description of the configuration other than the backlight unit is omitted.

The backlight unit is a device that functions to evenly project light from the rear side of the liquid crystal panel, and includes a light emitting unit generating light and a light guide plate, a reflecting plate, and a diffuser to uniformly propagate the light emitted from the light emitting unit toward the liquid crystal panel. It is comprised including a plate, a prism sheet, etc.

Hereinafter, the conventional backlight unit 10 will be described with reference to FIG. 1.

Referring to FIG. 1, the conventional backlight unit 10 includes a light emitting part 11 that emits light and a light guide plate 12 that scatters light generated by the light emitting part 11 and emits the surface to a surface light source. do.

Although not shown in FIG. 1, a reflecting plate is provided below the light guide plate 12 to reflect light traveling through the light guide plate 12 toward the light guide plate 12 to prevent light loss. .

A diffusion plate (not shown) and a prism sheet (not shown) are provided on the light guide plate 12 to diffuse light emitted from the light guide plate 12 and to adjust a direction in which the light exits.

Here, the projection pattern 12b for light scattering is formed on the lower surface of the light guide plate 12, that is, on the opposite side of the emission surface 12a from which light is emitted. The purpose of forming the reflective pattern 12b as described above is to increase the amount of light that proceeds to the liquid crystal panel by minimizing the light loss so that light can smoothly proceed toward the exit surface 12a through light scattering.

Therefore, the light guide plate 12 functions to change the incident light generated by the light emitting part 11 into the surface light source distribution.

Here, as the material of the conventional light guide plate 12, polymethyl methacrylate (hereinafter abbreviated as PMMA) or polycarbonate (hereinafter abbreviated as PC) has been mainly used.

As described above, the light guide plate 12 made of PMMA or PC material having the reflective pattern 12b formed therein was manufactured by an injection molding method, a thermocompression pattern transfer method, or the like.

However, in order to manufacture the light guide plate 12 made of PMMA or PC material having the reflective pattern as described above by injection molding, a complicated injection molding apparatus, for example, a heater for liquefying a thermoplastic resin, a pressurized plunger and an injection mold is required. In addition, there is a problem in that the loss of material in the process of injection molding the light guide plate, the production of the light guide plate is accompanied by a number of processes (heating, pressurization, injection, cooling, etc.) has a low productivity.

In addition, the conventional method of manufacturing a light guide plate by a thermocompression pattern transfer method also requires expensive and complicated equipment for thermocompression bonding, and a lot of processes are involved in the manufacture of the light guide plate, thereby having low productivity.

Furthermore, in the trend of slimming LCDs and mobile phones as the current market demands, there is a limitation in mold manufacturing technology to reduce the thickness of the light guide plate using the PMMA or PC as a material, and even if possible, high cost is required. there was.

Accordingly, the light guide plate formed of PMMA or PC is currently recognized as a limit of 0.4 mm (0.4T).

Disclosure of Invention The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a backlight unit having a light guide plate having improved productivity by changing the light guide plate material and improving productivity.

Another object of the present invention is to provide a light guide plate of a backlight unit having a minimized thickness and a method of manufacturing the same for slimming an LCD or a mobile phone.

The present invention, in order to achieve the above object, the light emitting unit for emitting light; The present invention provides a back light unit including a light guide plate that receives light emitted from the light emitting part and emits the surface of the light emitted from the light emitting part and cures the UV resin.

The light guide plate may include: a light guide plate body having a light incident part to which light emitted from the light emitting part is incident and an emission surface for emitting light; The light guide plate is integrally formed with the light guide plate and includes a reflection pattern for reflecting light.

And it is preferable that a serration pattern is formed in the light incident part.

The reflection pattern is; The further away from the light incident portion, it is preferable to have a denser density distribution.

The light guide plate is; After pressing the UV resin to a predetermined thickness, it is molded by irradiation with ultraviolet light and curing.

Here, the UV resin is preferably applied to the resin coating portion and then pressurized by an ultraviolet light transmitting press.

At least one of the resin coating portion and the press is preferably provided with a pattern portion for forming a reflective pattern of the light guide plate.

The resin coating unit; It is preferably configured to include a mold having a molding groove recessed as much as the manufacturing thickness of the light guide plate.

The light guide plate is more preferably at least 80% light transmittance.

In another aspect, the present invention, the step of pressing the UV resin to a predetermined thickness to the upper body and the lower body formed with a pattern portion on at least one side; Irradiating ultraviolet light to cure the UV resin; And it provides a light guide plate manufacturing method of a backlight unit comprising the step of taking out the light guide plate of the UV resin material formed with a reflective pattern.

In another aspect, the present invention, the step of pressing the UV resin to a predetermined thickness to the upper body and the lower body; Irradiating ultraviolet light to cure the UV resin; Taking out the light guide plate of the UV resin material; And it provides a light guide plate manufacturing method of a backlight unit comprising the step of forming a reflective pattern on the light guide plate.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention can be specifically realized the object of the present invention. In the description of this embodiment, the same name and the same reference numerals are used for the same configuration and additional description thereof will be omitted.

First, a preferred embodiment of the backlight unit according to the present invention will be described with reference to FIGS. 2 and 3.

2 is a cross-sectional view schematically showing an embodiment of a backlight unit according to the present invention, and FIG. 3 is a perspective view showing a light guide plate of the backlight unit shown in FIG. 2.

2 and 3, the backlight unit 100 according to the present invention includes a light emitting unit 110 for emitting light and a light guide plate 120 provided at one side of the light emitting unit 110.

Here, the light emitting unit 110 may include various light emitting means 111 such as a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED), but currently has various advantages such as long life and white light. LED is mainly used because of the situation.

In addition, the light guide plate 120 receives a surface of the light emitted from the light emitting unit 110. Since the basic contents of the light guide plate 120 and the backlight unit have been described in the related art of the present disclosure, an additional description of the function will be omitted.

However, in the present invention, the light guide plate 120 is characterized in that it is molded by curing UV resin (hereinafter referred to as UV resin).

In other words, the light guide plate 120 receives the surface of the light emitted from the light emitting unit 110 and emits the surface. The material is made of a UV resin to improve manufacturability.

The UV resin is generally a mixed liquid of an oligomer, a monomer, and a photointiator, hereinafter referred to as a mixed solution for UV curing. The UV curing mixture may include a scattering agent, etc. in addition to the above materials.

Here, the oligomer is generally called a UV curing resin as a polymer compound, and the monomer is added to control the viscosity and curing rate of the UV curing mixture as a low molecular material. The photoinitiator is a material that is activated by ultraviolet light to cause the UV curing mixture to start a polymerization reaction.

Here, the UV curing mechanism is a radical reaction mechanism, and proceeds as an initiation reaction, growth reaction, chain reaction and stop reaction.

In summary, the light guide plate 120 according to the present invention may be molded into a desired shape within a few seconds (about 5 to 6 seconds according to the experiment) by irradiating UV light to the UV curing mixture. Of course, the curing time of the UV curing liquid mixture may be further shortened by adjusting conditions such as UV irradiation amount, light intensity, light guide plate thickness, photoinitiator concentration, temperature and the like.

The light guide plate 120 includes a light guide plate body 121 having a light incident part 121a through which light emitted from the light emitter is incident, an emission surface 121b emitting surface light, and a reflection pattern for reflecting light. And 122.

Here, the reflective pattern 122 is provided for light scattering, and integrally formed in the light guide plate body 121. The reflective pattern 122 may be formed by a direct processing method, an etching method, a laser processing method, or a sand blasting method.

The reflective pattern 122 is provided on one side and / or the other side of the light guide plate body 121 to form a reflective surface. More specifically, as shown in FIGS. 2 and 3, in the flat type light guide plate, the reflective pattern 122 may be formed on the opposite side of the exit surface 121b, and the edge type (described later) ( edge type) In the light guide plate, the reflective pattern may be formed on the exit surface.

In more detail, the reflective pattern 122 may be formed in a protruding or recessed shape, and may be evenly distributed on one side and / or the other side of the light guide plate body to have a uniform density as a whole. Preferably, the further away from the light emitting unit 110 is configured to have a dense density distribution.

Here, as the density of the reflective pattern 122 is farther from the light emitting part 110, the denser density distribution may be formed depending on the distance from the light emitting part 110 of the reflective pattern 122. In addition to the manner in which the number of grooves increases with the first function or the second function, the distance from the light emitting unit 110 may be divided in arbitrary steps so that the number of protrusions or grooves increases gradually as the number of grooves crosses the boundary of the partition. And the manner in which the size of the protrusions or grooves forming the reflective pattern 122 is gradually or stepwise enlarged.

Accordingly, in the light guide plate 120 according to the present invention, the luminance of light emitted from the light emitting part 110 in the light emitting part 110b is far from the light emitting part 110, so that the light emission uniformity of the entire light emitting surface is predetermined. Can be maintained above the level.

More preferably, the light guide plate 120 according to the present invention may further include a serration pattern 121c formed in the light incident part 121a.

This is to improve the uniformity of the emission near the light incident part 121a by diffusing the light incident from the light emitting part 110 to diffuse the incident light.

2 and 3, the serration pattern 121c will be described in more detail. The light emitting unit 110 is provided to face one side surface of the light guide plate body 121. One side of the light guide plate body 121 opposite to 110 forms the light incident portion 121a.

Although not shown, the light emitting unit 110 includes a plurality of light emitting lamps 111 such as LEDs disposed at equal intervals along a line parallel to the light receiving unit.

Accordingly, even though light is emitted radially from the light emitting lamps 111 and is incident through the light incidence part 121a and refracted according to the refractive index of the light guide plate 120, the light is incident in the vicinity of the light incidence part 121a. The non-overlapping portion of the non-light is displayed, which causes the LCD screen to appear dark in the vicinity of the light incident portion 121a.

However, when the serration-shaped pattern 121c is provided on the side surface of the light incident part 121a as in the present invention, the light emitted radially by the adjacent light emitting lamps 111 is the light guide plate body ( While incident to 121, the light penetrates the serration pattern 121c and is diffused by the law of refraction to minimize the matt portion.

Here, the serration pattern 121c is formed in a sawtooth shape, a semicircular cross-sectional shape, or the like along one side surface of the light guide plate 120.

As the light guide plate 120 according to the present invention having the above-described shape, it is preferable to use a UV curing liquid mixture having a light transmittance of at least 80% or more. It can be prepared by adjusting the ratio or type of the composition constituting the mixed solution for UV curing experimentally.

Of course, it is obvious that a light guide plate having a light transmittance of 80% or less may be used depending on the purpose of use of the backlight unit 100 to which the light guide plate 120 is applied and / or the development of the light source.

The properties of the UV resin as described above are affected by the type of oligomer and monomer mixed in the UV curing mixture.

However, more preferably, the light transmittance of the light guide plate 120 is at least 85% or more to increase the light efficiency. The refractive index of the light guide plate 120 is preferably about 1.4 to 1.7 when air is 1.

[Table 1] provided below is the experimental data of the conventional PMMA injection light guide plate, [Table 2] is the experimental data of the light guide plate of the UV resin material according to the present invention.

The UV resin light guide plate provided in this experiment was formed by curing the FA9344-2 mixed solution formulated to have an oligomer: monomer: photoinitiator = 68: 29: 3 when the weight of the UV curing mixed solution was 100. It is apparent that the present invention is not limited thereto and may be variously changed.

In other words, the present invention has a main technical idea to improve the manufacturability of the light guide plate by curing the UV resin to produce a light guide plate, and does not have a main technical idea in the type of UV resin and its mixing ratio.

In Tables 1 and 2, the light guide portion represents the opposite side of the light incident portion 121a, and the center portion represents the central portion of the light guide plate 120. The test specimens were randomly extracted from each of the conventional light guide plate and the UV resin light guide plate according to the present invention, respectively, and the luminance was measured by three points of the light portion, three points of the center portion, and three points of the light incident portion. Was performed.

As can be seen from [Table 1] and [Table 2], the conventional PMMA injection light guide plate and the light guide plate of the UV resin material according to the present invention have a high level without significant difference in luminance, uniformity and color coordinate (CIE). It can be seen that.

In addition, it is understood that the UV resin light guide plate may be manufactured by mixing and curing at various ratios within the ratio range of oligomer 60 to 72, monomer 23 to 34, and photoinitiator 5 to 7 based on 100 weight of the UV curing mixture. In addition to the above-described range, those skilled in the art of UV resin can be seen that the UV resin light guide plate can be easily and experimentally manufactured using the gist of the present invention.

Next, with reference to FIGS. 4A, 4B, and 5, an apparatus for manufacturing a light guide plate of a backlight unit according to the present invention will be described.

4A and 4B are a perspective view and a cross-sectional view of an embodiment of an apparatus for manufacturing a light guide plate of the backlight unit illustrated in FIG. 2, and FIG. 5 illustrates a process of curing the light guide plate of the backlight unit illustrated in FIG. 2. It is sectional drawing shown.

4A, 4B and 5, the light guide plate 120 according to the present invention may be molded by pressing the UV curing liquid to a predetermined thickness and then irradiating and curing UV light.

To this end, one embodiment of the apparatus 200 for manufacturing the light guide plate 120 according to the present invention, the resin coating portion 210 is applied to the UV curing aqueous solution and the UV curing applied to the resin coating portion 210 It is configured to include a press 220 for pressurizing the aqueous solution.

For convenience of description, the resin coating part 210 will be referred to as a lower body, and the press 220 will be referred to as an upper body.

Here, it is preferable that the pattern part 211 for forming the reflective pattern 122 is formed in the lower body 210. Of course, the pattern portion may be provided on the upper body 220 as described later.

In more detail, a molding groove 212 having a shape corresponding to the shape of the light guide plate 120 may be formed in the lower body 210, and the molding groove 212 may be manufactured in the light guide plate 120. It is preferable that the shape is recessed by the thickness.

A pattern portion 211 corresponding to the reflective pattern 122 is formed at the bottom of the molding groove 212, and a serration portion corresponding to the serration pattern 121c is formed at one side wall of the molding groove 212. 213a is formed.

The side frame 213 on which the serration portion 213a of the serration pattern 121a is formed may be separately manufactured and assembled on the lower body 210.

When the light guide plate 120 is taken out, when the side frame 213 is separated from the lower body 210, the light guide plate 120 may be easily taken out.

The mold (lower body) and the press (upper body) configured as described above apply the predetermined amount of the UV curing mixture to the molding groove 212 of the lower body, and the light guide plate is applied to the upper body 220. In the state pressurized to a predetermined desired thickness, as shown in FIG.

When the UV curing mixture is completely cured, the light guide plate of the UV resin material according to the present invention is manufactured by separating the upper body 220 from the lower body 210 and then taking out the light guide plate 120. do.

Here, the ultraviolet light is irradiated by an ultraviolet lamp, at least one of the lower body and the upper body is preferably a material that can transmit the ultraviolet light.

In the present invention, the upper body 220 having the press function is provided as a UV-permeable glass press, but is not limited thereto.

Therefore, the light guide plate 120 of the UV resin material according to the present invention may be manufactured in a short time through a simple device and a simple process.

This is because UV resin light guide plate can be manufactured at room temperature and excessive design conditions such as being able to withstand high temperature and high pressure like injection method are not required. This is because there is no need to provide an expensive peripheral device.

Furthermore, the light guide plate 120 according to the present invention may be slimmer than the conventional one by the pressure thickness control by the press 220. In other words, since the thickness adjustment by the press 220 or the molding groove 212 may be easily performed, the light guide plate 120 may be manufactured to a desired thickness as needed.

6 is a perspective view illustrating another embodiment of an apparatus for manufacturing a light guide plate of the backlight unit illustrated in FIG. 2.

Referring to FIG. 6, the light guide plate manufacturing apparatus 300 includes a lower body 310 to which the UV curing liquid mixture U is applied, and an upper body 320 provided above the lower body 310. do.

In the present embodiment, a pattern portion 311 corresponding to the reflective pattern 122 is formed on the bottom of the upper body 320. In addition, a bottom of the upper body 320 may be provided with a molding groove (not shown) having the pattern portion 311 formed on the ceiling surface thereof. The molding groove is preferably recessed upward by the thickness of the light guide plate 120.

However, when the forming groove is not formed, the UV curing liquid mixture may be cured while being pressed with the upper body to a predetermined thickness, and then the UV resin plate having the reflective pattern may be cut to an appropriate size to obtain a light guide plate having an area. .

Except for the above-described configuration, since its function and structure are similar to those of the embodiment of the light guide plate manufacturing apparatus 200 described above, other additional descriptions are omitted.

Therefore, the pattern part 311 may be formed on any one of the lower body 310 and the upper body 320, and when the light guide plate of a special shape is to be formed, the upper body 320 and the lower body ( The pattern portion 311 may be formed in all of the 310.

However, as described above, the reflective pattern of the light guide plate according to the present invention may be formed by using other methods such as direct processing, laser processing method, or etching method on the light guide plate basic shape cured by the above-described UV resin curing operation. Can be.

Next, another embodiment of the backlight unit 500 and the manufacturing apparatus thereof according to the present invention will be described with reference to FIGS. 7 to 9.

7 is a cross-sectional view schematically showing another embodiment of the backlight unit according to the present invention, FIG. 8 is a perspective view showing a light guide plate of the backlight unit shown in FIG. 7, and FIG. 9 is a view of the backlight unit shown in FIG. 7. A perspective view of one embodiment of an apparatus for manufacturing a light guide plate.

7 and 8, an edge type light guide plate 520 is applied to another embodiment of the backlight unit 500 according to the present invention.

The edge type light guide plate 520 has a shape that is relatively thicker than other portions of the light incident part 521, so as to minimize the loss of light emitted from the light emitting part 510 and to slim down the light guide plate 520. Are manufactured.

In the edge type light guide plate 520, the reflective pattern 522 of the light guide plate is generally formed on the emission surface 523, and the light emission part 521 includes the above-mentioned serration pattern 521 a. It is preferable.

Since the edge type light guide plate 520 and the flat plate type light guide plate described in the present embodiment exist in the conventional injection light guide plate, the description thereof is omitted.

Next, referring to FIG. 9, a manufacturing apparatus for molding another embodiment of a backlight unit according to the present invention is shown.

9, the light guide plate manufacturing apparatus 600 according to the present embodiment includes a lower body 610 to which the UV curing aqueous solution is applied and an upper part to pressurize the UV curing aqueous solution applied to the lower body 610. It comprises a sieve 620.

Here, a pattern portion 611 for forming the reflective pattern 522 is formed on the lower body 610, and a guide corresponding to the outer shape of the light guide plate 520 on the upper side of the lower body 610. The frame 630 is installed.

Accordingly, the guide frame 630 and the lower body 610 together form a molding groove of the light guide plate 520. In the edge type light guide plate 520, since the light incident part 521 of the light guide plate is formed relatively thicker than other parts, the shape of the light incident part 521 is formed on the upper surface of the lower body 610. The stepped groove 612 corresponding to the groove is formed deeper than the bottom of the molding groove forming the reference surface of the pattern portion 611.

Meanwhile, the lower body 610 may be separately manufactured and assembled with a side frame 613 on which a corresponding serration portion 613a of the serration pattern 521a is formed.

In addition, when the side frame 613 is separated from the lower body 610 for taking out the light guide plate 520, the taking out of the light guide plate 520 is easily performed.

Except for the above-described configuration, the rest of the configuration is the same as in the above-described embodiment of the light guide plate manufacturing apparatus, and a repeated description thereof will be omitted.

However, in one embodiment 200 of the light guide plate manufacturing apparatus described with reference to FIGS. 4A and 4B, the deepest portion adjacent to the serration portion 213 is formed deeper among the bottom edges of the forming grooves 212. By doing so, the edge type light guide plate 520 may be formed.

FIG. 10 is a plan view illustrating a keypad unit 700 of a cellular phone to which the backlight unit according to the present invention is applied. The backlight units 120 and 520 are provided behind the keypad 710 of the cellular phone and input letters or numbers. In order for the key 720 provided in the keypad 720 to be pressed to emit an electric signal, the light is emitted, and the numbers or letters printed on the keypad can be identified by the naked eye at night or in a dark place. .

According to the present invention, the light emitted from the rear side of the keypad 720 is incident on the light guide plate (120, 520) provided to the rear of the keypad 720, the surface of the conventional top view LED (direct lighting LED, Compared to keypads using LEDs that emit light directly behind the keypad, high emission uniformity can be obtained at the same time, and the same level of uniformity and high luminance can be obtained at a lower cost than EL (Electro Luminescence). Can be.

Next, referring to FIGS. 11 and 12, a method of manufacturing the light guide plate of the backlight unit according to the present invention will be described.

11 is a flowchart illustrating an embodiment of a method of manufacturing a light guide plate of a backlight unit according to the present invention, and FIG. 12 is a flowchart of another embodiment of a method of manufacturing a light guide plate of a backlight unit according to the present invention.

First, referring to FIG. 11, an embodiment of the light guide plate manufacturing method is a method in which a UV resin is cured and a reflection pattern is also formed.

In more detail, in one embodiment of the manufacturing method of the light guide plate, the step of applying a UV curing liquid mixture on the lower body (S10), pressing the UV curing liquid mixture to a predetermined thickness to the upper body and the lower body ( S20), irradiating UV light to the pressure-curable mixed solution for UV curing (S30), and curing (S30) to take out the cured UV resin light guide plate.

Here, when at least one of the upper body 220, 320, 620 and the lower body (210, 310, 610), the pattern portion 211, 311, 611 for forming the reflective pattern is formed, According to the manufacturing method according to the embodiment, it is possible to obtain a light guide plate on which the reflective patterns 122 and 522 are formed at the same time as curing.

That is, a light guide plate is manufactured by a method of pressing a UV resin, that is, a UV curing mixed solution in a patterned mold, and curing UV resin by irradiating ultraviolet rays.

The extraction of the light guide plates 120 and 520 is performed after the upper bodies 220, 320 and 620 are separated from the lower bodies 210, 310 and 610.

Next, referring to FIG. 12, one embodiment of the light guide plate manufacturing method is a method of forming a reflective pattern on one side of the light guide plate after curing the UV resin to form a basic shape of the light guide plate.

In more detail, another embodiment of the light guide plate manufacturing method, the step of applying a UV curing liquid mixture on the lower body (S100), the step of pressing the UV curing liquid mixture to a predetermined thickness to the upper body and the lower body ( S200), irradiating UV light to the pressure-curable liquid mixture to cure the UV-cured liquid mixture (S300), taking out the cured UV resin light guide plate (S400), and forming a reflective pattern on the light guide plate It comprises a step (S500).

Here, the forming of the reflective pattern (S500) may be performed by the above-described direct processing, etching method, laser processing method, or the like.

As described above, the preferred embodiments of the present invention have been described, and the fact that the present invention can be embodied in other specific forms in addition to the above-described embodiments without departing from the spirit or scope thereof has ordinary skill in the art. It is obvious to them.

Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive, and thus, the present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents.

The backlight unit and the light guide plate manufacturing method of the backlight unit according to the present invention have the following effects.

First, since the light guide plate of the backlight unit is formed of a UV resin material, the molding process of the light guide plate is simple, the manufacturing of the manufacturing apparatus required for this is easy, and the manufacturing cost is also reduced, thereby reducing equipment investment cost and Productivity is improved.

Secondly, according to the present invention, the light-curing plate is molded by curing the UV-curing mixed solution by ultraviolet rays, and thus, even when forming a molding groove having a desired depth in the mold (resin coating part), it does not require the technology of high difficulty and heat resistance required for the mold And since the level of strength is not high, it is possible to slim the light guide plate by setting the depth of the pressurized height control molding groove of the press. And this effect makes it possible to slim down the object to which the backlight unit according to the present invention is applied.

Third, according to the present invention, since it takes only a few seconds to cure the UV curing liquid mixture, the time required for manufacturing is shortened compared to the light guide plate of PMMA or PC material.

Fourth, according to the present invention, since the equipment required to cure the UV curing liquid mixture is simple and the volume of the equipment is small, the area occupied by the equipment is minimized to improve the space utilization rate inside the light guide plate production plant.

Claims (11)

Light emitting unit for emitting light; And And a light guide plate configured to receive light emitted from the light emitting part and output the surface to the surface, and to form a UV resin by curing the UV resin. The method of claim 1, The light guide plate is: A light guide plate body having a light incident part to which light emitted from the light emitting part is incident and an emission surface for emitting light; And The backlight unit is formed integrally with the light guide plate body and includes a reflection pattern for reflecting light. The method of claim 2, And a serration pattern is formed in the light incident part. The method of claim 2 or 3, The reflection pattern is; The backlight unit, characterized in that the closer to the light incident portion has a density density distribution. The method according to any one of claims 1 to 3, The light guide plate is; After pressing the UV resin to a predetermined thickness, the backlight unit, characterized in that the molding by irradiating ultraviolet light to cure. The method of claim 5, The UV resin is applied to a resin coating portion and then back light unit, characterized in that the press (Press). The method of claim 6, At least one of the resin coating portion and the press is provided with a pattern portion for forming a reflective pattern of the light guide plate. The method of claim 7, wherein The resin coating unit; And a mold having a molding groove recessed as much as the manufacturing thickness of the light guide plate. The method according to any one of claims 1 to 3, The light guide plate has a light transmittance of at least 80%. Pressing the UV resin to a predetermined thickness with an upper body and a lower body having a pattern portion formed on at least one side; Irradiating ultraviolet light to cure the UV resin; And A method of manufacturing a light guide plate of a backlight unit, comprising: extracting a light guide plate made of a UV resin material having a reflective pattern formed thereon. Pressing the UV resin to a predetermined thickness with an upper body and a lower body; Irradiating ultraviolet light to cure the UV resin; Taking out the light guide plate of the UV resin material; And The light guide plate manufacturing method of the backlight unit comprising the step of forming a reflective pattern on the light guide plate.

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