KR20120051830A - Methode of manufacturing light guide plate and the light guide plate - Google Patents

Methode of manufacturing light guide plate and the light guide plate Download PDF

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Publication number
KR20120051830A
KR20120051830A KR1020100113135A KR20100113135A KR20120051830A KR 20120051830 A KR20120051830 A KR 20120051830A KR 1020100113135 A KR1020100113135 A KR 1020100113135A KR 20100113135 A KR20100113135 A KR 20100113135A KR 20120051830 A KR20120051830 A KR 20120051830A
Authority
KR
South Korea
Prior art keywords
guide plate
light guide
scattering
light
manufacturing
Prior art date
Application number
KR1020100113135A
Other languages
Korean (ko)
Inventor
박철
Original Assignee
박철
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 박철 filed Critical 박철
Priority to KR1020100113135A priority Critical patent/KR20120051830A/en
Publication of KR20120051830A publication Critical patent/KR20120051830A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00663—Production of light guides
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26—Processing photosensitive materials; Apparatus therefor
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor

Abstract

A method of manufacturing a light guide plate that provides a movement path of light incident from the outside may include applying a liquid leveling agent to an incident surface of a light guide plate body to which light is incident, and curing the liquid leveling agent to an incident surface of the light guide plate body. Forming a planarization layer.

Description

Light guide plate manufacturing method and light guide plate {METHODE OF MANUFACTURING LIGHT GUIDE PLATE AND THE LIGHT GUIDE PLATE}

The present invention relates to a method of manufacturing a light guide plate and a light guide plate, and more particularly, to a method of manufacturing a light guide plate excellent in light transmission efficiency and a light guide plate.

Recently, flat panel displays such as a liquid crystal display, a plasma display panel, and an organic light emitting diode are used in place of a cathode ray tube. Among the flat panel display devices, the liquid crystal display device includes a liquid crystal panel constituting a screen and a backlight unit for supplying light to the liquid crystal panel because the liquid crystal display device is a non-light emitting device that cannot generate light by itself. The light source unit of the backlight unit uses a line light source such as a lamp or a point light source such as a light emitting diode, and the point light source may be mounted on a substrate.

1 is an exploded perspective view of a general liquid crystal display device.

Referring to FIG. 1, a general liquid crystal display device 1 includes a liquid crystal panel 10 and a backlight unit 40. The liquid crystal panel 10 does not emit light by itself and receives light from the backlight unit 40 disposed behind the liquid crystal panel 10.

In more detail, the liquid crystal display device 1 supplies light to the liquid crystal panel 10 forming the image, the mold frame 30 supporting the side of the liquid crystal panel 10, and the rear surface of the liquid crystal panel 10. It includes a backlight unit 40, a lower cover 50 for accommodating the backlight unit 40, the upper cover 60 is coupled to the lower cover 50 to cover the front of the liquid crystal panel 10.

The backlight unit 40 is positioned behind the liquid crystal panel 10 and includes an optical member 41, a light guide plate 45, a light source 46, and a reflective sheet 47.

The optical member 41 is positioned on the rear surface of the liquid crystal panel 10 and includes a diffusion sheet 42, a prism sheet 43, and a protective sheet 44. The diffusion sheet 42 serves to diffuse the light from the light source unit 46 and supply the light to the liquid crystal panel 10. The prism sheet 43 collects light diffused from the diffusion sheet 42 in a direction perpendicular to the plane of the upper liquid crystal panel 10. The light passing through the prism sheet 43 proceeds almost vertically to provide a uniform luminance distribution. The protective sheet 44 protects the prism sheet 43 which is weak to scratches.

The light guide plate 45 which guides light to the back surface of the prism sheet 43 is disposed on the back surface of the prism sheet 43. The light guide plate 45 is disposed behind the liquid crystal panel 10, and evenly distributes the light supplied from the light source unit 46 toward the liquid crystal panel 10. The light source unit 46 is disposed on any one side of the light guide plate 45 provided in a substantially rectangular plate shape to supply light toward the light guide plate 45. The light source unit 46 includes a light emitting diode and a light emitting diode substrate on which the light emitting diode is mounted.

On the other hand, the light guide plate 45 is made of a transparent plastic such as acrylic resin, and the light incident to the inside of the light guide plate 45 by the various scattering patterns formed on the bottom or top surface for scattering and reflection of light to the outside. Let go.

The scattering pattern on the surface of the light guide plate 45 is formed by screen printing using light scattering ink, or may be formed by directly processing a pattern into a mold and injecting the pattern.

FIG. 2 is a perspective view illustrating a silk screen printing method used to form a scattering pattern on a light guide plate surface, and FIG. 3 is a partially enlarged perspective view of a light guide plate having a scattering pattern formed through the silk screen printing method shown in FIG. 2. .

2 and 3, a stencil 72 having a pattern composed of fine holes 73 formed in correspondence to a scattering pattern for silk screen printing is disposed on one surface of the light guide plate 45, and the stencil 72 is disposed on the surface of the light guide plate 45. When the ink is provided to the upper part through the squeegee 70 containing the ink on the silk, the ink leaks through the minute hole 73 formed in the stencil 72 so that the ink is patterned on one surface of the light guide plate 45. They can be buried and stamped out to form scattering patterns.

On the other hand, the projection 75 of the scattering pattern formed using the silk screen printing method has a diameter (A) of approximately 600㎛. Each of the protrusions 75 constituting the scattering pattern is preferably smaller in diameter and more distributed. Because the light passing through the light guide plate 45 is diffused and scattered and is visible from the outside through the liquid crystal panel 10. At this time, when the projection 75 is large and open, the light transmitted through the light guide plate 45 is transmitted. The silver protrusions 75 form unevenness in luminance at the exit surface of the light guide plate 45, which may cause deterioration of the quality of the liquid crystal display device 1.

In addition, the thickness of the light guide plate 45 is a trend to manufacture the thickness of the light guide plate 45 from 2.5 mm or more to 2 mm or less in general in order to consider light loss or reduce the thickness of the liquid crystal display device 1. In the case where the diameter of the protrusion 75 is about 600 μm, a problem that the image of the protrusion 75 is dimly visible from the outside occurs.

Moreover, it is difficult to form the diameter of the fine hole 73 formed in the stencil 72 to 600 micrometers or less through the silk screen method. This is because, when the diameter of the hole 73 becomes 600 µm or less, the ink 73 does not escape the hole 73 well and the hole 73 is clogged.

In addition, in recent years, the liquid crystal display device 1 is gradually enlarged, and thus the area of the light guide plate 45 is also increased. However, it is increasingly difficult to make fine scattering patterns through the conventional silk screen printing method or injection using a mold. .

The present invention provides a method of manufacturing a light guide plate having excellent light transmission efficiency and a light guide plate. In particular, the present invention provides a method of manufacturing a light guide plate and a light guide plate capable of providing a scattering protrusion provided in order to uniformize the luminance of light passing through the light guide plate with a smaller diameter.

The present invention provides a method of manufacturing a light guide plate and a light guide plate in which afterimages due to scattering projections are not visible even if the thickness of the light guide plate is reduced.

The present invention provides a light guide plate manufacturing method and a light guide plate which can easily form scattering protrusions on a large light guide plate that can be applied to a liquid crystal display device which is gradually being enlarged.

According to an exemplary embodiment of the present invention, the method of manufacturing a light guide plate for guiding a movement path of light incident from the outside, the step of forming a photosensitive resin layer by applying a photosensitive resin on the upper surface or the bottom surface of the light guide plate body, and The photosensitive resin layer may be treated by a photolithography process to form scattering protrusions.

By forming the scattering protrusions by a photolithography process, it is easy to form the diameter of the scattering protrusions to a size of 400 μm or less, and more scattering protrusions on the area of the same light guide plate as compared with the conventional scattering protrusions having a diameter of 600 μm or more. It can be arranged, which is much more advantageous to make the luminance of light passing through the light guide plate uniform.

In addition, as in the related art, when the diameter of the scattering protrusions is about 600 μm, a problem of the appearance of the scattering protrusions is dimly visible from the outside, and it is difficult to form the thickness of the light guide plate to 2 mm or less, but the diameter of the scattering protrusions Even if the thickness of the light guide plate is formed to be less than 400 μm and the thickness of the light guide plate body is formed to be 2 mm or less, the afterimage caused by scattering protrusions does not occur. Thus, the thickness of the light guide plate is reduced, thereby making the overall thickness of the liquid crystal display device thin. There is an advantage to this.

On the other hand, in the case where the light source portion for providing light to the light guide plate is disposed on the side of the light guide plate, the scattering projection is denser so that the number of light incident from the side where the light guide plate is disposed and gradually increases along the path of light passing through the light guide plate. In this way, it is possible to improve the luminance of light that can fall away from the incident surface. In addition, the photosensitive resin may include a scattering material, and the scattering material may be more scattered or reflected by the scattering material at the emission surface of the light guide plate, thereby preventing the afterimage caused by the scattering protrusions from being visible from the outside. As the scattering material, at least one of TiO 2 and SiO 2 may be used.

In addition, according to the method of manufacturing a light guide plate according to the present invention, it is easy to manufacture a light guide plate which is enlarged together in accordance with the trend of a liquid crystal display device which is gradually enlarged in recent years. Specifically, in the case of forming the scattering protrusions through the conventional silk screen printing method or injection using a mold, it is difficult to manufacture a light guide plate of 42 inches or more, but the scattering protrusions according to the present invention are enlarged by being formed through a photolithography process. It is easy to form scattering protrusions on the light guide plate.

In addition, after the photolithography process, a heat treatment step of applying heat to the scattering protrusion may be further performed, in order to smooth the surface of the scattering protrusion through the heat treatment process, and the surface of the smoothed scattering protrusion is emitted to the exit surface of the light guide plate. Scattering and reflection of light can be made more uniform.

According to an exemplary embodiment of the present invention, the light guide plate for guiding the movement path of the light incident from the outside is formed on the light guide plate body and the top or bottom surface of the light guide plate body, the photosensitive resin is provided by a photolithography process It may include scattering projections.

By forming the scattering protrusion in the light guide plate of the present invention and the light guide plate by a photolithography process, the diameter of the scattering protrusion can be easily formed to a size of 400 μm or less, and compared with a conventional scattering protrusion having a diameter of 600 μm or more. More scattering projections can be placed on the area of the light guide plate, which is much more advantageous to make the luminance of light passing through the light guide plate uniform.

A scattering material may be included in the method of manufacturing the light guide plate of the present invention and the photosensitive resin for scattering protrusions in the light guide plate. This can be compared with the difficulty in forming protrusions of 600 μm or less by including scattering material because ink is hardened and clogged in the fine holes formed in the stencil when forming protrusions through the silk screen method.

In the manufacturing method of the light guide plate and the light guide plate of the present invention, even after the thickness of the light guide plate body is formed to be 2 mm or less, the phenomenon of afterimages due to scattering protrusions does not occur. It can manufacture.

According to the method of manufacturing a light guide plate and a light guide plate according to the present invention, it is easy to manufacture a light guide plate which is enlarged together in accordance with the trend of a liquid crystal display device which is gradually enlarged in recent years. Specifically, in the case of forming the scattering protrusions through the conventional silk screen printing method or injection using a mold, it is difficult to manufacture a light guide plate of 42 inches or more, but the scattering protrusions according to the present invention are enlarged by being formed through a photolithography process. It is easy to form scattering protrusions on the light guide plate.

1 is an exploded perspective view of a general liquid crystal display device.
2 is a perspective view illustrating a silk screen printing method used to form a scattering pattern on a light guide plate surface.
3 is a partially enlarged perspective view of a light guide plate having a scattering pattern formed through the silk screen printing method illustrated in FIG. 2.
4 is a cross-sectional view of a photosensitive resin layer formed on one surface of a light guide plate body according to an exemplary embodiment of the present invention.
5 is a cross-sectional view for explaining a step of exposing a photosensitive resin layer using a mask according to an embodiment of the present invention.
6 is a cross-sectional view for describing a step of etching an exposed photosensitive resin layer according to an exemplary embodiment of the present invention.
FIG. 7 is a cross-sectional view for describing a process of heat treating a scattering protrusion obtained in FIG. 6.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments. For reference, in the present description, the same numbers refer to substantially the same elements, and may be described by quoting contents described in other drawings under such a rule, and the contents repeated or deemed apparent to those skilled in the art may be omitted.

4 is a cross-sectional view of forming a photosensitive resin layer on one surface of a light guide plate body according to an embodiment of the present invention, Figure 5 is a view for explaining the step of exposing the photosensitive resin layer using a mask according to an embodiment of the present invention 6 is a cross-sectional view for explaining a step of etching the exposed photosensitive resin layer according to an embodiment of the present invention, Figure 7 is a cross-sectional view for explaining the process of heat treatment of the scattering projections obtained in FIG. .

First, referring to FIG. 7, the light guide plate 100 formed according to the method of manufacturing a light guide plate according to the present embodiment includes a light guide plate body 110 and a hemispherical scattering protrusion 130 formed on one surface of the light guide plate body 110. do.

Hereinafter, the manufacturing process of the light guide plate 100 described above will be described sequentially with reference to FIGS. 4 to 7.

First, referring to FIG. 4, the light guide plate body 110 manufactured using a transparent acrylic resin is disposed, and a photosensitive resin layer 120 is formed on the upper surface of the light guide plate body 110 using a liquid photosensitive resin. Here, the photosensitive resin layer 120 may include a scattering material 125 to increase light scattering efficiency, and may use TiO 2 and SiO 2 as the scattering material 125.

After the photosensitive resin layer 120 is formed, as shown in FIG. 5, the photosensitive resin layer 120 is subjected to an exposure process using the mask 140.

The mask 140 used in the exposure process is provided with a mask pattern 145 in the form of a hole formed in accordance with the diameter or pattern of the scattering protrusion 130 to be formed later.

When the mask 140 is disposed on the photosensitive resin layer 120, and the light is irradiated from the mask 140, the light passing through the mask pattern 145 is irradiated to the photosensitive resin layer 120 disposed below. do.

As described above, the exposed photosensitive resin layer 120 leaves an original scattering protrusion 132 before heat treatment as shown in FIG. 6 through an etching process.

For reference, in the present embodiment, a photosensitive resin having a positive property of leaving the photosensitive resin layer 120 in the exposed portion is used. In some cases, however, the scattering protrusions may be formed using a mask having a mask pattern corresponding to a region other than the scattering protrusions. In this case, a photosensitive resin having negative properties may be used.

As described above, after the raw scattering protrusion 132 is formed through the etching process, a separate washing process may be further performed.

On the other hand, the raw scattering projections 132 formed through the exposure, etching, cleaning operations, as shown in Figure 6, has an angled corner. These edges may act as a cause of irregularity in scattering or reflection of light emitted through the light guide plate body 110.

Thus, in the method of manufacturing the light guide plate according to the present invention, after the photolithography process, the heat treatment step of applying heat to the raw scattering protrusion 132 is further performed. When heat is applied to the raw scattering protrusion 132, the angular edges of the raw scattering protrusion 132 are dropped or partially liquefied, as shown in FIG. 7 by the surface tension of the raw scattering protrusion 132. Is transformed smoothly. The surface of the smoothed scattering protrusion 130 may be more uniformly scattered and reflected light emitted from the exit surface of the light guide plate body 110.

For reference, one surface of the light guide plate body in which the scattering protrusions are formed may be disposed to face the liquid crystal panel, may be disposed to face each other, and the scattering protrusions may be formed on both surfaces of the light guide plate body.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

100: Light guide plate 110: Light guide plate body
120: photosensitive resin layer 125: scattering material
130: scattering protrusion 140: mask
145 ： mask pattern

Claims (13)

In the manufacturing method of the light guide plate for guiding the movement path of the light incident from the outside,
Forming a photosensitive resin layer by coating a photosensitive resin on an upper surface or a bottom surface of the light guide plate body; And
Treating the photosensitive resin layer by a photolithography process to form scattering protrusions;
Method of manufacturing a light guide plate comprising a. The method of claim 1,
The scattering projection is a manufacturing method of the light guide plate, characterized in that formed in a size of 400㎛ or less. The method of claim 1,
The thickness of the light guide plate body is 2mm or less is provided. The method of claim 1,
The scattering protrusions are distributed to increase gradually along the movement path of the light guide plate manufacturing method. The method of claim 1,
The photosensitive resin manufacturing method of the light guide plate, characterized in that it comprises a scattering material. The method of claim 5,
The scattering material comprises at least one of TiO 2 and SiO 2 manufacturing method of the light guide plate. The method of claim 1,
After the photolithography process,
And a heat treatment step of applying heat to the scattering protrusions, wherein the scattering protrusions have a smooth surface by the heat treatment. In the light guide plate for guiding the movement path of the light incident from the outside,
A light guide plate body; And
A scattering protrusion formed on an upper surface or a bottom surface of the light guide plate body and provided by treating a photosensitive resin by a photolithography process;
Method of manufacturing a light guide plate comprising a. The method of claim 7, wherein
The scattering projection is a light guide plate, characterized in that formed in a size of 400㎛ or less. The method of claim 1,
A light guide plate, characterized in that provided in the thickness of the light guide plate body 2mm or less. The method of claim 8,
The scattering protrusions are distributed to increase gradually along the movement path of the light. The method of claim 8,
The photosensitive resin includes a scattering material,
The scattering material comprises at least one of TiO 2 and SiO 2. The method of claim 8,
The scattering protrusion is a light guide plate, characterized in that provided in a hemispherical form through heat treatment.
KR1020100113135A 2010-11-15 2010-11-15 Methode of manufacturing light guide plate and the light guide plate KR20120051830A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100113135A KR20120051830A (en) 2010-11-15 2010-11-15 Methode of manufacturing light guide plate and the light guide plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100113135A KR20120051830A (en) 2010-11-15 2010-11-15 Methode of manufacturing light guide plate and the light guide plate

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KR20120051830A true KR20120051830A (en) 2012-05-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102141649B1 (en) * 2019-03-06 2020-08-05 주식회사 케이티앤지 A fixture including a light guide portion and an aerosol generating device including the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102141649B1 (en) * 2019-03-06 2020-08-05 주식회사 케이티앤지 A fixture including a light guide portion and an aerosol generating device including the same
WO2020180128A1 (en) * 2019-03-06 2020-09-10 Kt&G Corporation Fixture including light guide and aerosol generating device including the fixture
US11493184B2 (en) 2019-03-06 2022-11-08 Kt&G Corporation Fixture including light guide and aerosol generating device including the fixture

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