KR101162357B1 - Multifunctional optical plate with nano-dot, back light unit having the same optical plate, and manufacturing method for the same multifunctional optical plate - Google Patents

Abstract

PURPOSE: A multifunctional optical plate with nano dots, a backlight unit therewith, and a manufacturing method thereof are provided to improve optical efficiency by concentrating and diffusing light without various sheets. CONSTITUTION: A multifunctional optical plate with nano dots comprises a light guide plate(10), multiple nano dots(20), and multiple micro patterns. The surface of the light guide plate discharges light flowing into the light guide plate to the outside. The nano dots are formed on one surface of the light guide plate. The diameter of each nano dot is 10-500 nanometers. The micro patterns are formed between the light guide plate and the nano dots.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite optical plate in which a nano dot is formed, a backlight unit including the same, and a composite optical plate having a nano dot formed thereon. PLATE}

The present invention relates to a composite optical plate. And more particularly, to a composite optical plate on which a nano dot is formed, a backlight unit including the same, and a method for manufacturing a composite optical plate on which a nano dot is formed.

A light source used in a backlight unit of a lighting or LCD (Liquid Crystal Display) is generally converted into a surface light source having uniform intensity rather than being used by itself. Therefore, in addition to a light source, a light guide panel (LGP), a diffuser sheet for diffusing light by arranging a plurality of beads or micro lenses or lenticular type lenses, a diffuser sheet passing through the diffuser sheet, A prism sheet for refracting and condensing light to increase the brightness, a reflector sheet for blocking light escaping to the lower end of the light guide plate and re-introducing the light into the light guide plate, and the like are used. However, when such a plurality of sheets is used, there is a problem that the light utilization efficiency is rapidly lowered.

In addition, the sheets stacked in a plurality may suffer surface damage and scratches due to the friction of the upper and lower surfaces, thereby deteriorating the quality of outgoing light.

Therefore, there is a need for research on a composite optical plate capable of performing the same functions such as diffusion and light condensation without using a plurality of sheets.

SUMMARY OF THE INVENTION The present invention has been made in view of the above needs, and it is an object of the present invention to provide a composite optical plate in which a nano dot is formed, a backlight unit including the nano dot, And to provide a manufacturing method thereof.

According to an aspect of the present invention, there is provided a light guide plate comprising: a light guide plate for emitting light incident on a surface light source based on optical dispersion; And a plurality of nano dots having a diameter of 10 nm or more and 500 nm or less, the nano dots being formed on one surface of the light guide plate that is emitted to the surface light source.

A plurality of micro-patterns are formed in the form of micro-sized projections between the light guide plate and the nanodots, and the plurality of nanodots may be formed along the upper portion of the micro pattern.

The object of the present invention can also be achieved by providing a backlight unit including a composite optical plate having a plurality of nano dots formed thereon.

In another aspect of the present invention, there is provided a method of manufacturing a light guide plate, comprising the steps of: (S10) preparing a light guide plate; (S20) coating a liquid curable resin thin film on one surface of a light guide plate; A step (S30) in which a nano stamp in which a plurality of nano dots are engraved is pressed onto the curable resin thin film; A step (S40) of curing the liquid curable resin thin film; A step (S50) in which the nanostamp is removed from the cured curable resin thin film; And a step (S60) of completing a composite optical plate in which a plurality of nano dots are formed in the form of protrusions (S60).

In addition, an object of the present invention is to provide a light guide plate (S110) A step S115 of forming a plurality of micropatterns in the form of protrusions of a micro size as one surface of a light guide plate to be emitted to a surface light source; A step (S120) in which a liquid curable resin thin film is applied on top of the micro pattern; A step (S130) in which a nano stamp having a plurality of nano dots formed intensely is pressed against a liquid curable resin thin film; A step (S140) of curing the liquid curable resin thin film; A step (S150) in which the nano stamp is removed from the cured curable resin thin film; And a step (S160) of completing a composite optical plate in which a plurality of nano dots are formed in the form of protrusions (S160).

According to an embodiment of the present invention, since a plurality of nanodots are formed on the light guide plate, diffusion and condensing functions can be performed without using a plurality of sheets used in a backlight unit, thereby increasing light efficiency.

In addition, since the manufacturing method of the composite optical plate on which the nano dot is formed is manufactured by the nanoimprint process, an expensive exposing apparatus is not required, and the manufacturing is easy and the process is simple.

1 is a sectional view showing a cross section of a composite optical plate according to a first embodiment of the present invention,
2 is a sectional view showing a cross section of a composite optical plate according to a second embodiment of the present invention,
3 is a sectional view showing a cross section of a composite optical plate according to a third embodiment of the present invention,
FIG. 4 is a diagram showing a conical illuminance of a conventional light guide plate having a V-cut only on its surface for light dispersion,
5 is a view showing the conical illuminance of the composite optical plate according to the first embodiment of the present invention,
6 is a flowchart showing a sequential order of a first embodiment of a method of manufacturing a composite optical plate on which a nano dot is formed according to the present invention,
7 is a flowchart sequentially showing a second embodiment of a method of manufacturing a composite optical plate on which a nano dot is formed according to the present invention.

< Nano dot  Formed composite optical plate>

My 1 Embodiment

1 is a cross-sectional view showing a cross section of a composite optical plate 1 according to a first embodiment of the present invention. As shown in FIG. 1, the first embodiment includes a plurality of nano dots 20 formed on a surface of a light guide plate 10 and a planar light source 10, which are nano-sized. The first embodiment of the composite optical plate 1 according to the first embodiment of the present invention includes a plurality of nano dots 20 formed on the plane light exit surface of the light guide plate 10, So that a wide viewing angle can be realized and a high luminance can be realized.

The light guiding plate 10 is a light guiding plate that receives an internal light that flows into the interior of the light guiding plate 10 through a side light source (not shown) or a direct light source (not shown) and that is nonuniformly distributed by optical processes such as reflection, total reflection, To the outgoing light (L). For this, a two-dimensional light dispersion pattern (not shown) may be formed on the surface of the light guide plate 10 through screen printing or molding. The light guide plate 10 may be generally formed of a transparent acrylic material.

The plurality of nano dots 20 can enlarge the viewing angle without providing a separate diffusion sheet in the direction of the emitted light L of the light guide plate 10 and thereby increase the light efficiency of the emitted light L. [ The plurality of nanodots 20 may be provided on one surface of the light guide plate 10 in a protruding shape and have a diameter of 10 nm or more and 500 nm or less. The pitch between the projections may be a distance corresponding to the diameter of the projection, and may be formed adjacent to each other as shown in FIG. 1, but may be spaced apart from several tens to several hundreds of nanometers.

The plurality of nanodots 20 may be formed through a nano imprint process. That is, a nano stamp in which a plurality of nano dots are formed at an obtuse angle is formed, and the liquid curable resin applied on the upper side of the light guide plate 10 is pressed with the nano stamp and ultraviolet (UV) And can be molded by curing the resin. On the other hand, the plurality of nanodots 20 may be formed by applying thermal energy to a thermoplastic resin in a film form.

By forming a plurality of nanodots 20 through the nanoimprint process, an expensive exposing apparatus is not required and the process can be simplified. Particularly, in the case of UV nanoimprint, the curing resin is sintered in a short time of several seconds to several tens of seconds, so that the processing time is very short.

The nano stamp may be made of silicon or nickel. In this embodiment, a quartz plate, a glass plate, a polymer film or the like is used because a UV curing method is used. The negative structure of the nano stamp is formed in a nanoscale .

On the other hand, the composite optical plate 1 having a plurality of nano dots according to the present invention has a light source (not shown) such as a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED) And can be used together to constitute a back light unit (Bcak Light Unit).

In addition to the light source, the backlight unit also includes a reflection sheet (not shown) provided on the back surface of the light guide plate 10 to block and reflect the light emitted from the light source in all directions, A lamp reflector (not shown) may be further provided.

My 2 Embodiment

2 is a cross-sectional view showing a cross section of a composite optical plate 2 according to a second embodiment of the present invention. 2, the second embodiment includes a V-shaped micro pattern 31 formed on the light guide plate 10 and the upper side of the light guide plate 10, and a plurality of Nano dot formed on the nano- (20).

Hereinafter, only the configuration that differs from the first embodiment will be described. 2, the second embodiment is provided with the light guide plate 10 in the same manner as the first embodiment, but a plurality of nano dot 20 are not formed directly on the light guide plate 10, And is formed on the pattern 31. The V-shaped micro patterns 31 may be formed perpendicularly to each other on the plane of the light guide plate 10, and may have a size of tens to hundreds of microns.

A plurality of nano dots 20 formed on the V-shaped micro pattern 31 may be formed in the same manner using a nano stamp formed with a recessed shape as in the first embodiment, Due to the elasticity of the resin. The plurality of nano dot 20 formed on the V-shaped micro pattern 31 presses the nano stamp perpendicularly to the plane of the light guide plate 10 so that the protrusions of the plurality of nano dot 20 are perpendicular to the plane of the light guide plate 10 .

My 3 Example

3 is a cross-sectional view showing a cross section of a composite optical plate 3 according to a third embodiment of the present invention. As shown in Fig. 3, the third embodiment has a dot micropattern 32 whose diameter is tens to hundreds of microns, unlike the second embodiment. Here, the method of forming a plurality of nanodots 20 on the dot micropattern 32 is the same as that of the first and second embodiments. The dot micropattern 32 may be formed by an inkjet method.

<Experimental data>

4 is a view showing the conical illuminance of a conventional light guide plate V-cut on the surface for light dispersion according to the distance, and Fig. 5 is a view showing a conical illuminance of the composite optical plate 1 according to the first embodiment of the present invention In accordance with the distance. In the comparison experiment between the conventional light guide plate and the first embodiment, the test light source uses one and the same point light source.

4. As can be seen from comparison between FIG. 4 and FIG. 5, the same distance (for example, 1.00 m, 2.00 m, 3.00 m, 4.00 m, 5.00 m, 6.00 m, 7.00 m, 8.00 m), but have a wider viewing angle in the first embodiment of the present invention. This means that a wider viewing angle can be formed without the diffusion sheet on the upper side of the light guide plate. That is, in the illumination in which the existing light guide plate is provided, a diffusion sheet can only be used in order to widen the viewing angle. However, in the illumination using the composite optical plate 1 having the nano dot, diffusion sheet is not necessary as a result of diffusion.

Furthermore, when the composite optical plate 1 of the present invention is used for illumination, the light efficiency of illumination can be increased since a diffusion sheet is unnecessary.

< Nano dot  Method of producing composite optical plate formed>

My 1 Embodiment

6 is a flowchart sequentially showing a first embodiment of a method of manufacturing a composite optical plate on which a nano dot is formed according to the present invention. Referring to FIG. 6, first, the light guide plate 10 is prepared (S10). Here, the light guide plate 10 may use a light guide plate whose surface is V-cut to optically disperse the internal light into the outgoing light L, and may be formed of acrylic material.

Next, a liquid curable resin thin film is applied to one surface of the light guide plate 10 to be emitted to the surface light source 40 (S20). Here, as the liquid curable resin thin film, a photo-curable resin can be used.

Next, a nanostamp in which a plurality of nano dots 20 are engraved is pressed to the upper portion of the liquid curable resin thin film (S30). The liquid curable resin thin film can be pressed at a low pressure using a resin having a low viscosity.

Next, the liquid curable resin thin film is cured (S40). In the case of the photocurable resin thin film, ultraviolet irradiation at a wavelength of 300 to 400 nm can be performed.

Next, the nano stamp is removed from the curable resin thin film (S50).

Finally, a composite optical plate on which a plurality of nano dots 20 are formed in the shape of a protrusion is completed (S60), so that a first embodiment of a method for producing a composite optical plate in which a nano dot 20 is formed is carried out. A complete plurality of nano dot 20 may be formed between the steps S50 and S60 by removing a residual layer by adding a reactive ion etching (RIE) process.

My 2 Embodiment

7 is a flowchart sequentially showing a second embodiment of a method of manufacturing a composite optical plate on which a nano dot is formed according to the present invention. 7, the light guide plate preparation step S110, the pressing step of the nanostamp S130, the curing step S140 of the liquid curable resin thin film, the step of removing the nanostamps S150 in the second embodiment of the manufacturing method, The composite optical plate is completed in step S160. In the first embodiment, the light guide plate preparation step S10, the nano stamp pressing step S30, the liquid curable resin thin film curing step S40, Stamp removal step (S50), the composite optical plate is the same as the completion step (S60).

However, in the second embodiment, after the light guide plate preparation step (S110), a plurality of micro patterns provided in the form of protrusions of a micro size are formed on one surface of the light guide plate to be emitted to the surface light source (S115) Is applied onto the micro pattern (S120). Here, the micro pattern may be a V-shaped micro pattern 31 or a dot micro pattern 32, and such micro patterns may be formed through an ink jet method.
When such a micropattern is formed by an ink jet method, a UV curable ink such as an acryl compound may be directly patterned on a light guide plate in micrometer size and cured by UV exposure. The formation of the nanopattern through the nanoimprinting process on the cured micropattern is caused by the difference in scale between the cured micropattern and the nanopattern, as described above.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the above detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

L: Outgoing light
1, 2, 3: Composite optical plate
10: light guide plate
20: Nano dot
31: V-shaped micro pattern
32: dot micro pattern

Claims (5)

delete A light guide plate for emitting incident light based on light dispersion to a surface light source;
A plurality of nano dots having a diameter of 10 nm or more and 500 nm or less; And
And a plurality of micropatterns formed between the light guide plate and the nano dot in the form of protrusions of a micro size,
Wherein the plurality of nanodots are formed along an upper portion of the micropattern.
A backlight unit comprising the composite optical plate according to claim 2.
delete A step of preparing a light guide plate (S110);
A step S115 of forming a plurality of micropatterns in the form of protrusions of a micro size as one surface of the light guide plate to be emitted to the surface light source;
(S120) a liquid curable resin thin film is coated on the micro pattern;
A step (S130) in which a nano stamp formed with a plurality of nano dots engraved is pressed onto the liquid curable resin thin film;
A step (S140) of curing the liquid curable resin thin film;
Removing the nanostamp from the cured curable resin thin film (S150); And
And a step (S160) of completing a composite optical plate having a plurality of nano dots formed in a protrusion shape.

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