KR101234852B1 - Light guide plate, optical apparatus and method for forming the light guide plate - Google Patents

Abstract

The light guide plate of the present invention has a base plate having one surface and the other surface opposite thereto, and is present on the other surface of the base plate, and covers the uneven portion and the uneven portion for changing the path of light introduced from one side of the base plate to the one side. It includes a resin layer in which a plurality of openings spaced apart from each other.
The light guide plate may be manufactured in an inline, non-printing method, and has an advantage of excellent luminance characteristics and luminance uniformity of a backlight unit and a display device including the same.

Description

Light guide plate, optical apparatus and method for forming the light guide plate}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate, an optical device, and a method of manufacturing a light guide plate, and more particularly, to a method of manufacturing a light guide plate, an optical device, and a non-printing type light guide plate, in which a manufacturing process is simple, and brightness and luminance uniformity can be improved.

Liquid crystal displays (LCDs) are one of the most widely used flat panel displays. In general, a liquid crystal display has a structure in which a liquid crystal layer is enclosed between a thin film transistor (TFT) array substrate and a color filter substrate. When an electric field is applied to the electrodes existing on the array substrate and the color filter substrate, the arrangement of the liquid crystal molecules in the liquid crystal layer sealed between the array substrate and the color filter substrate is changed, and the image is displayed using the liquid crystal molecules.

BACKGROUND ART In recent years, LED TVs, notebook PCs, liquid crystal monitors, car navigation systems, and the like with liquid crystal display devices require a backlight unit capable of cost reduction and high luminance and uniform luminance distribution. The backlight unit is divided into a direct method of disposing a light source such as an LED lamp or a fluorescent lamp under the liquid crystal panel and an edge method of disposing a light source laterally. Recently, edge-type backlights have been widely used due to the tendency of thin and short electronic products such as LED TVs. In general, the backlight unit includes a protective film, a D-BEF film, a prism film, a diffusion film, a light guide plate, a light reflection film, a heat dissipation structure, and the like. It exists and the light efficiency greatly depends on the light exit pattern.

At present, many processes are required to manufacture a light guide plate. In other words, the original plate that melted the resin through the extruder using the transparent resin is moved to the processing company, and the import inspection, unpacking, cutting, mirror processing, etc. are carried out. Through natural drying and packaging, the light guide plate required by the backlight unit is completed. Therefore, the manufacturing cost of the light guide plate is high by many processes, the design of the light emitting pattern is limited by printing and laser processing, and the light emitting efficiency is low due to the light absorption of the printing ink. In addition, in order to manufacture the light exit pattern light guide plate by extrusion, many roll processes are involved.

One object of the present invention is to provide a light guide plate, a backlight unit, a display device, and a method of manufacturing a light guide plate having excellent brightness characteristics and brightness uniformity.

Another object of the present invention is to provide a method of manufacturing a non-printed light guide plate which can reduce manufacturing costs by a simple manufacturing process, a light guide plate manufactured by the same, a backlight unit and a display device using the same.

Still another object of the present invention is to provide a light guide plate manufacturing method capable of manufacturing an output pattern inline.

One aspect of the invention relates to a light guide plate. The light guide plate is provided on a base plate having one surface and the other surface opposite thereto, and is present on the other surface of the base plate, and covers the uneven portion and the uneven portion that change the path of the light introduced from one side of the base plate to the one side, and are spaced apart from each other. It is characterized by including a resin layer in which a plurality of openings exist.

In some embodiments, the uneven portion may include at least one of a prism pattern, a lenticular pattern, an embossed pattern, and a microlens pattern.

In an embodiment, the concave-convex portion may be a prism pattern in which the same prism is periodically repeated adjacent to each other, the lenticular pattern in which the same lenticular is periodically repeated adjacent to each other, and the same microlens is periodically repeated adjacent to each other It may be a microlens pattern.

In embodiments, the refractive index of the material constituting the resin layer and the uneven portion may be the same, and the base plate and the uneven portion may be made of the same material.

In embodiments, the base plate may include any one or more of methacrylic resin, styrene resin, polycarbonate resin or olefin resin.

In an embodiment, the resin layer may include any one or more of methacrylic resin, styrene resin, polycarbonate resin or olefin resin.

Another aspect of the invention relates to an optical device. The optical device includes the light guide plate and a light source present on at least one side of the light guide plate.

In an embodiment, the further away from the light source, the greater the area of the opening or the density of the opening.

In an embodiment, the method may further include a liquid crystal panel stacked on one side of the base plate.

Another aspect of the present invention relates to a light guide plate manufacturing method. The method of manufacturing a light guide plate may include preparing a base plate having an uneven portion formed on one surface thereof, forming a photosensitive resin layer on an uneven portion of the base plate, placing a photomask above the photosensitive resin layer and exposing the photosensitive resin layer. And developing the exposed photosensitive resin layer to form a resin layer covering one surface of the uneven portion and having a plurality of openings spaced apart from each other.

In an embodiment, in the preparing of the base plate having the uneven portion formed on the one surface, the uneven portion may include any one or more of a prism pattern, a lenticular pattern, an embossed pattern or a microlens pattern.

In an embodiment, the preparing of the base plate having the uneven portion formed on the one surface may include extruding the molten resin constituting the base plate to the pattern forming roller having the intaglio pattern formed on the uneven portion.

In an embodiment, the forming of the photosensitive resin layer on the uneven portion of the base plate may be performed while removing the cover film or the protective film of the dry film including the photosensitive resin composition layer to form the photosensitive resin layer on the uneven portion of the base plate. Can be formed.

In an embodiment, the exposing may be performed by ultraviolet rays in the step of placing the photomask above the photosensitive resin layer and exposing the photosensitive resin layer.

In an embodiment, in the developing of the exposed photosensitive resin layer to form a resin layer covering one surface of the uneven portion and having a plurality of openings spaced apart from each other, the developing may be performed by an alkaline developer.

The light guide plate manufacturing method of the present invention, the light guide plate, the backlight unit, and the display device manufactured by the present invention have no light absorption due to printing ink, and thus have high luminance and excellent luminance uniformity.

In addition, the method of manufacturing a non-printing light guide plate of the present invention is simple and its inline manufacturing is possible, thereby lowering the manufacturing cost of the light guide plate manufactured, the backlight unit including the same, and a display device.

1 is a perspective view of a light guide plate according to an exemplary embodiment of the present invention, and FIG. 2 is a plan view seen from the direction A of FIG. 1.
3 shows various embodiments of the uneven portion of the present invention.
4 is a cross-sectional view illustrating a backlight unit according to an exemplary embodiment of the present invention.
5 shows various embodiments of the resin layer opening pattern of the present invention.
6 is a perspective view illustrating a method of manufacturing a disc base plate according to an embodiment of the present invention, FIG. 7 is a cross-sectional view for describing an exposure process, and FIG. 8 is a cross-sectional view showing a light guide plate after exposure.

One aspect of the invention relates to a light guide plate. Hereinafter, a perspective view of a light guide plate according to one embodiment of the present invention will be described with reference to FIG. 1 and FIG. The light guide plate 100 according to an embodiment of the present invention includes a base plate 102, an uneven portion 104, and a resin layer 106.

The base plate 102 has one surface 102a and the other surface 102b opposite thereto, and the uneven portion 104 and the resin layer 106 are present on the other surface 102b. The base plate 102 and the concave-convex portion 104 may be manufactured integrally by extrusion, injection, or the like. In addition, the base plate 102 may have a constant thickness, or may have a wedge shape in which the thickness becomes thinner or thicker.

The base plate 102 may be used without limitation as long as it is a material that transmits light to visible light. For example, one or more of methacrylic resin, styrene resin, polycarbonate resin or olefin resin may be included.

The concave-convex portion 104 formed on the other surface 102b of the base plate has a concave portion and a convex portion, and changes the path of the light introduced from one side of the base plate toward the one surface 102a. The uneven portion 104 may include at least one of a prism pattern, a lenticular pattern, an embossed pattern, and a microlens pattern.

The resin layer 106 is formed on the upper surface (lower surface of the drawing) of the uneven portion 104 and serves to uniformly transmit the light incident on the light guide plate to one side 102a of the base plate. The resin layer 106 covers the uneven portion, and in some regions, openings (holes H) not covering the uneven portions exist to form a predetermined opening pattern.

The cross-sectional shape of the opening (H) may be a polygon, as well as an amorphous shape, such as a circle, oval, triangle, square, etc., may be a mixture of various cross-sectional shapes. As an example, FIG. 2 shows a resin layer 106 having an opening H having a circular cross-sectional shape. On the other hand, the diameter of the opening (H) may be 0.1mm to 20mm, preferably 1mm to 5mm, the diameter of the opening (H) may vary depending on the size, thickness, etc. of the light guide plate, the arrangement, type, etc. of the light source. have.

The resin layer 106 may be used without limitation as long as it is a material that transmits visible light. For example, the resin layer 106 may include any one or more of methacrylic resin, styrene resin, polycarbonate resin, or olefin resin. have.

The base plate 102, the uneven portion 104 and the resin layer 106 may be made of different materials, any two or more may be made of the same material. Preferably, the uneven part 104 and the resin layer 106 may be made of a material having the same refractive index. The refractive index of the uneven portion 104 and the resin layer 106 must be the same to suppress reflection and refraction due to the difference in refractive index. More preferably, the base plate 102, the uneven portion 104 and the resin layer 106 may be made of a material having the same refractive index. In the present invention, the meaning of a material having the same refractive index includes a case where it is substantially the same.

3 shows various embodiments of the uneven portion of the present invention. As shown in FIG. 3A, the uneven portion may be a prism pattern having a prism pitch P _P and a predetermined prism height H _P. That is, the same prism may be a prism pattern in which the same prism is periodically repeated adjacent to each other to have a predetermined pitch P _P and a predetermined height H _P , and the peaks (or valleys) of the prism extend in the Z direction of FIG. 3. .

The shape of the prism is preferably a symmetrical prism such as an equilateral triangle or an isosceles triangle, but may not be a symmetrical prism, and the shape may vary depending on the type and arrangement of the light source.

The prism pitch P _P and the height H _P of the prism may vary depending on the shape and material of the light guide plate, the position and type of the light source, and the like. For example, the prism pitch P _P may be 5 μm to 1,000 μm, preferably 5 μm to 500 μm, and the height H _P of the prism is 5 μm to 500 μm, preferably 5 μm. To 300 μm. In the range of the prism pitch P _P and the height H _P of the prism, the luminance characteristics and the luminance uniformity characteristics may be excellent and may be easily manufactured.

The length of the base of the prism constituting the prism pattern may be the same as or different from the prism pitch, and the vertex angle α of the prism is preferably 70 to 110 degrees.

Although not shown in the drawings, the prism pattern may have a structure in which two or more identical prisms are repeated. That is, the first prism and the second prism different in size or shape may be alternately repeated. Two kinds of prisms may be repeated, or three or more identical prisms may be repeated.

In addition, the shape of the prism according to the shape of the prism pattern, the prism pitch does not exist, the prism pitch is present but the height is not constant, the arbitrary (irregular) prism shape is arranged, the position of the light source Various types of prism patterns may be used, such as a gradually changing shape.

As shown in FIG. 3B, the uneven portion may be a lenticular pattern. The lenticular pattern may be a regular lenticular pattern having a lenticular pitch P _L and a constant lenticular height H _L. That is, the same lenticular may be periodically repeated adjacent to each other to have a predetermined pitch P _L and a predetermined height H _L , and may be a regular lenticular pattern in which the valley of the lenticular extends in a straight line in the Z direction of FIG. 3. .

The lenticular pitch P _P and the lenticular height H _P may vary depending on the shape and material of the light guide plate, the position and type of the light source, and the like. For example, the lenticular pitch P _L may be 5 μm to 1,000 μm, preferably 5 μm to 500 μm, and the lenticular height H _P is 5 μm to 500 μm, preferably 5 μm to 300 μm. In the lenticular pitch P _L and the lenticular height H _P , luminance characteristics and luminance uniformity characteristics may be excellent and may be easily manufactured.

In addition, there are various forms such as a shape having a lenticular pattern but no lenticular pitch, a shape in which the height of the lenticular is not constant, an arbitrary lenticular shape is arranged, and a shape in which the lenticular shape gradually changes depending on the position of the light source. Lenticular patterns can be used.

As shown in FIG. 3C, the uneven portion may be an amorphous embossed pattern without a predetermined shape, or may be a microlens pattern in which microlenses of a predetermined shape are regularly or irregularly arranged, although not shown in the drawing. .

Another aspect of the invention relates to an optical device. The optical device may be a backlight unit (BLU). 4 is a cross-sectional view illustrating a backlight unit according to an exemplary embodiment of the present invention. As shown, the backlight unit according to one embodiment of the present invention includes the light guide plate 100 and the light source 110 described above, and may further include various optical films (sheets, plates).

The light source 110 may be a light emitting diode (LED) or a cold cathode fluorescent lamp (CCFL). The light emitting diode may be a white light emitting diode or three kinds of light emitting diodes of R, G, and B.

The light source reflector 120 may be present around the light source 110 to prevent an external outflow of the light emitted from the light source 110 and to increase the efficiency of use of the light. The reflector 130 may exist below the light guide plate 100, and may reflect light leaked from the light guide plate 100 to the lower side and send the light back toward the light guide plate 100. One or more of a diffusion sheet, a brightness enhancement film, or a protective film may be further present on the light guide plate 100. This is indicated by reference numeral 140.

Light emitted from the light source 110 positioned on at least one side of the light guide plate 100 enters one side of the light guide plate and flows into the bottom surface (the other side) of the light guide plate. The light introduced into the portion where the resin layer is present is mainly totally reflected or refracted to go to the upper side, and the light introduced into the region in which the opening is present is made to be totally reflected inside the light guide plate due to a small refractive angle. That is, a light guide plate having a uniform luminance distribution may be manufactured by adjusting an area, an arrangement, and the like of the opening.

5 shows various embodiments of the resin layer opening pattern of the present invention. The cross section of the opening H forming the opening pattern may have various shapes, but FIG. 5 shows the opening H having a circular cross section as an example. In the present invention, the overall shape formed by the plurality of openings is referred to as an 'opening pattern'.

As shown in FIG. 5A, when the light source 110 is located on one side of the light guide plate, the area of the opening H gradually increases as the distance from the light source 110 increases, and the density of the opening H is increased. It is desirable to increase gradually in terms of luminance and luminance uniformity. That is, the cross section of the opening H is larger toward the right side of the drawing, and the density of the opening H may increase.

As shown in FIG. 5B, when the light source 110 is located at both sides of the light guide plate, the area of the opening H gradually increases as the distance from the light source 110 increases, and the density of the opening H is increased. It is desirable to increase gradually, but the present invention is not limited thereto.

As shown in FIG. 5C, when the light source 110 is located at four side surfaces of the light guide plate, the area of the opening H gradually increases as the distance from the light source 110 increases, and the density of the opening H is increased. May increase gradually. That is, the area of the opening H may be the largest in the central portion of the light guide plate, and the density thereof may be high, and the size and density thereof may gradually decrease toward the outside.

Another aspect of the invention relates to an optical device. The optical device (not shown) may be a backlight unit. The backlight unit may include a base plate having one surface and the other surface opposite thereto, and an uneven portion formed on the other surface of the base plate and having recesses and concave portions for changing the path of light introduced from one side of the base plate to the one surface side. And a light guide plate covering one surface of the uneven portion and including a resin layer having an opening pattern, and a light source existing on at least one side of the light guide plate.

A liquid crystal panel may be positioned at one side of the backlight unit. The liquid crystal panel may include a liquid crystal layer between an upper substrate and a lower substrate, and upper and lower polarizers may be positioned on each of the upper and lower substrates. The liquid crystal layer may include twisted nematic (TN) and super twisted nematic (STN) liquid crystals, and may include horizontal alignment mode liquid crystals such as IPS (In-Plane Switching), Super-IPS, and FFS (Fringe Field Switching). It may also include a vertical alignment (VA) mode liquid crystal.

The liquid crystal panel may be a passive matrix or an active matrix, but a TFT (Thin Film Transistor) active matrix liquid crystal panel is preferable. The liquid crystal display device may be used for image display of an electronic device such as a mobile phone, a monitor, a TV, a tablet PC, a notebook computer, and the like.

In addition, by attaching a photo or the like instead of the liquid crystal panel to one surface of the above-described backlight unit may be an electronic picture frame, it may be an advertisement board if the advertising picture is placed.

Another aspect of the invention relates to a method of manufacturing a light guide plate. 6 is a perspective view illustrating a method of manufacturing a disc base plate according to an embodiment of the present invention, FIG. 7 is a cross-sectional view for describing an exposure process, and FIG. 8 is a cross-sectional view showing a light guide plate after exposure. Hereinafter, a description will be given with reference to FIGS. 6 to 8.

First, a base plate having an uneven portion on one surface is prepared. The base plate may be formed by melt extrusion of the resin constituting the base plate, or may be formed by injection molding, it is preferable in terms of productivity from the melt extrusion.

In an embodiment, when the resin constituting the base plate is melted and provided by the resin supply unit 202, the uneven portion having a specific pattern is formed by passing through the first roller 204, the second roller 206, and the third roller 208. Disc base plate 102c is formed. The number of rollers is only one example and may include two or more rollers. At least one of the rollers, for example, the second roller 206 may be a pattern forming roller for forming the uneven portion. In the pattern forming roller for forming the uneven portion, a negative pattern of a pattern to be formed on the base plate is formed, and a predetermined pattern (uneven portion) is formed on the disc base plate 102c while extruding the molten resin.

Next, the disc base plate 102c is cut to complete a base plate 102 having a predetermined size, and a photosensitive resin layer 106a is formed on the upper surface of the uneven portion of the base plate 102 (FIG. 7). Of course, the following process may be performed on the disc base plate 102c which proceeds in the form of a web without cutting the disc base plate 102c.

The photosensitive resin layer 106a may be formed by laminating a dry film on which the photosensitive resin composition layer is formed, or may be formed by screen printing, spin coating, dip coating, or the like. can do.

In an embodiment, a method of forming the photosensitive resin layer 106a on the base plate 102 by the method of laminating the dry film on which the photosensitive resin composition layer is formed is preferable in terms of productivity and price, but the present invention is not limited thereto. .

The photosensitive dry film may be composed of a cover film, a photosensitive resin composition layer, and a protective film. The said photosensitive dry film is obtained by apply | coating and drying the said photosensitive resin composition on a cover film, forming a photosensitive resin composition layer on the said cover film, and laminating | stacking a protective film in order to protect the exposed surface of this photosensitive resin composition layer. Can lose. The photosensitive resin composition layer may include a synthetic resin material, a sensitive material reacting with light such as ultraviolet rays (UV), a solvent, and the like, and a portion in which light is irradiated melts in a developer or a portion in which no light is irradiated. This melting negative photosensitive resin composition layer may be sufficient.

When the cover film or the protective film of the photosensitive dry film is heated while being removed, a photosensitive resin layer may be formed (coated) on the base plate 102 (FIG. 7). The heating can be performed by a heating roller.

Next, the photomask 108 is fixed and the photosensitive resin layer 106a is exposed. The photomask may be a mask having a predetermined light shielding pattern formed on a quartz substrate, a glass substrate, or the like, or a flexible photomask having a light shielding pattern formed on a plastic substrate. For example, the photomask may be a film mask (flexible photomask) prepared by coating a gelatin and a silver halide, which is a photosensitive material, on a polyester substrate, forming a pattern using a laser, and developing and washing water.

The light source used for the exposure may be ultraviolet (UV), and may be near UV, mid UV, or deep UV. As a light source, a mercury (Hg) lamp, a cadmium (Cd) lamp, a xenon (Xe) lamp, an excimer laser, etc. may be used, but the present invention is not limited thereto.

Next, the exposed photosensitive resin layer is developed to cover one surface of the uneven portion to form a resin layer 106 in which the opening H is present (FIG. 8). Although there is no restriction | limiting in the developing solution which develops the exposed photosensitive resin layer, Alkali developing solution can be used. Specifically, 0.5-2.0 wt% of potassium carbonate (K ₂ CO ₃ ) developer and sodium carbonate (Na ₂ CO ₃ ) developer (aqueous solution) can be used. The development may be performed at a temperature range of about 15 ° C. to about 40 ° C., and may be further subjected to washing and drying with hot water after development.

The light guide plate manufacturing method described above may be performed inline. That is, the extruded disc base plate is cut into a predetermined size by a cutting device to form a base plate, and then a photosensitive resin layer is formed by a dry film coating device or a spin coating device, exposed in an exposure machine, and then developed in a developing machine. The process can be carried out inline.

< Example  And Comparative example >

In the following examples and comparative examples, the openings, that is, the light emission pattern shapes, present in the resin layer were designed using a simulation program. Specifically, the cross-sectional shape of the opening was circular dot, and the radius of the circular circle was gradually larger from 250 µm to 700 µm in the center of light, and the pitch between the circular dots was 2 mm in width and 1 mm in length.

 Example 1

A prism pattern roll having a pitch of 300 µm and a height of 150 µm was used to prepare a base plate having an uneven portion of a prism pattern, and then placed a mask film to form a resin layer through UV irradiation to form a 40-inch light guide plate. That is, a light guide plate having a prism in a dot was manufactured.

[Example 2]

Using a lenticular pattern roll having a pitch of 300 μm and a height of 150, a base plate having a lenticular pattern having an uneven portion was placed, and then a mask film was placed to form a resin layer through UV irradiation to form a 40-inch light guide plate .

[Example 3]

Using the amorphous embossed pattern roll to produce a base plate of the embossed portion of the uneven portion and then placed a mask film to form a resin layer through UV irradiation to make a 40-inch light guide plate.

Comparative Example 1

A light output pattern was formed on the base plate extruded by Sumitomo resin by screen printing (screen printing) to make a 40-inch light guide plate.

[Luminance measurement]

The light guide plates of Examples 1 to 3 and Comparative Example 1 were assembled into a 40-inch backlight unit, and luminance was measured using a BM7 luminance meter, and luminance uniformity was measured by measuring 9 points of the 40-inch light guide plate to evaluate luminance and luminance uniformity. As a light source of the backlight unit used, a short side LED edge type BLU was used.

Light guide plate thickness Average luminance
(cd / m ² ) Luminance
Uniformity (%) Example 1 3mm 5,620 79 Example 2 3mm 5,374 81 Example 3 3mm 4,993 83 Comparative Example 1 3mm 4,821 81

As shown in Table 1, Example 1 in which the uneven portion was a prism pattern had the highest average brightness, followed by Example 2 in which the uneven portion was a lenticular pattern, and then Example 3 in which the uneven portion was an emboss pattern. The luminance uniformity was not significantly different, but Example 3 in which the uneven portion was an embossed pattern was found to be the most excellent. On the other hand, Comparative Example 1 in which the light output pattern is formed by conventional screen printing shows that the average luminance is only 85.8% of Example 1, which can clearly confirm the effect of improving the brightness of the present invention.

100: light guide plate 102: base plate
104: uneven portion 106: resin layer
108: photomask 110: light source
120: light source reflector 130: reflector
202: resin supply unit 204, 206, 208: roller

Claims (19)

A base plate having one surface and the other surface opposite thereto;
An uneven portion present on the other side of the base plate, and configured to change a path of light introduced from one side of the base plate to the one side; And
A resin layer covering the uneven parts and having a plurality of openings spaced apart from each other.
Light guide plate comprising a.
The light guide plate of claim 1, wherein the uneven portion comprises at least one of a prism pattern, a lenticular pattern, an embossed pattern, and a microlens pattern.
The light guide plate of claim 1, wherein the uneven portion is a prism pattern in which the same prism is periodically repeated adjacent to each other.
The light guide plate of claim 1, wherein the uneven portion is a lenticular pattern in which the same lenticular is periodically repeated adjacent to each other.
The light guide plate of claim 1, wherein the uneven parts are microlens patterns in which the same microlenses are periodically repeated adjacent to each other.
The light guide plate according to claim 1, wherein a refractive index of the material constituting the resin layer and the uneven portion is the same.
The light guide plate of claim 1, wherein the base plate and the uneven portion are made of the same material.
The light guide plate of claim 1, wherein the base plate comprises at least one of methacrylic resin, styrene resin, polycarbonate resin, and olefin resin.
The light guide plate according to claim 1, wherein the resin layer comprises at least one of methacrylic resin, styrene resin, polycarbonate resin, and olefin resin.
The light guide plate of claim 1; And
A light source existing on at least one side of the light guide plate
Optical device comprising a.
The optical device of claim 10, wherein an area of the opening increases as the distance from the light source increases.
The optical device of claim 10, wherein a density of the opening increases as the distance from the light source increases.
The optical device of claim 10, further comprising a liquid crystal panel stacked on one side of the base plate.
Preparing a base plate having an uneven portion formed on one surface thereof;
Forming a photosensitive resin layer on the uneven portion of the base plate;
Placing a photomask above the photosensitive resin layer and exposing the photosensitive resin layer; And
Developing the exposed photosensitive resin layer to form a resin layer covering one surface of the uneven portion and having a plurality of openings spaced apart from each other;
Light guide plate manufacturing method comprising a.
The method of claim 14, wherein, in the preparing of the base plate having the uneven portion formed on the one surface, the uneven portion includes at least one of a prism pattern, a lenticular pattern, an embossed pattern, and a microlens pattern.
The method of claim 14, wherein the preparing of the base plate having the uneven portion formed on the one surface comprises extruding the molten resin constituting the base plate with a pattern forming roller having a negative pattern formed on the uneven portion.
The method of claim 14, wherein the forming of the photosensitive resin layer on the uneven portion of the base plate is heated while removing the cover film or the protective film of the dry film including the photosensitive resin composition layer to the photosensitive portion of the base plate A light guide plate manufacturing method for forming a ground layer.
The method of claim 14, wherein the exposing is performed by ultraviolet light in the step of placing the photomask above the photosensitive resin layer and exposing the photosensitive resin layer.
The light guide plate of claim 14, wherein the exposed photosensitive resin layer is developed to form a resin layer covering one surface of the uneven portion and having a plurality of openings spaced apart from each other, wherein the developing is performed by an alkaline developer. Way.

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