KR20130076970A - Back light unit having structure serration patterned plate coupled with light guide plate - Google Patents

Back light unit having structure serration patterned plate coupled with light guide plate Download PDF

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Publication number
KR20130076970A
KR20130076970A KR1020110145423A KR20110145423A KR20130076970A KR 20130076970 A KR20130076970 A KR 20130076970A KR 1020110145423 A KR1020110145423 A KR 1020110145423A KR 20110145423 A KR20110145423 A KR 20110145423A KR 20130076970 A KR20130076970 A KR 20130076970A
Authority
KR
South Korea
Prior art keywords
light guide
guide plate
sawtooth
plate
coupling plate
Prior art date
Application number
KR1020110145423A
Other languages
Korean (ko)
Inventor
류충엽
박대성
Original Assignee
주식회사 엘에스텍
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 주식회사 엘에스텍 filed Critical 주식회사 엘에스텍
Priority to KR1020110145423A priority Critical patent/KR20130076970A/en
Publication of KR20130076970A publication Critical patent/KR20130076970A/en

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    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
    • 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
    • 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
    • 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
    • G02F1/1336—Illuminating devices

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention has a technical feature to provide a structure in which the tooth-shaped coupling plate is formed on the light-receiving surface of the light guide plate is formed in a constant embossed or intaglio.
The present invention has a technical effect that can solve the problem of excessive heat generated between the LED (light source) and the light guide plate, the increase in the mold manufacturing cost, the defect rate, the disadvantages of the conventional method that the tooth shape is inseparable from the light guide plate. .

Description

BACK UNIT HAVING STRUCTURE SERRATION PATTERNED PLATE COUPLED WITH LIGHT GUIDE PLATE}

The present invention relates to a backlight device, and more particularly, by allowing an embossed or intaglio serrated structure to be detachably attached to one side of a light incident surface of a light guide plate, so that the tooth shape cannot be separated from the light guide plate. The present invention relates to a backlight device having a structure in which a tooth shape is detachable to solve disadvantages such as an increase in a mold manufacturing cost, an increase in a defective rate, and an excessive heat problem generated between an LED light source and a light guide plate.

In general, a light guide panel is a plate that provides a path for uniformly scattering and diffusing light emitted from a light source, and is a backlight used in a light receiving type flat panel display device such as a liquid crystal display device or an illumination signboard. Applied to the back light unit (BLU).

As a light source that transmits light to the light guide plate, a plurality of LEDs (point light sources) are usually integrated side by side and used as a line light source. In this case, the gap between the LEDs (LEDs) increases the light portion, the dark portion, and the light leakage phenomenon. back light) It causes a problem of appearance deterioration.

In particular, as the light efficiency of LEDs increases, the number of LEDs decreases, so that the gap between the LEDs becomes wider and worsens the appearance.

On the other hand, when the light efficiency of the LED (LED) is very large, one to four LEDs (LED) can be used by using the side or edge of the light guide plate.

In this case, the use of a very small number of LEDs (LEDs) reduces the circuit cost and has a spatial design advantage. In order to use this advantage, conventionally, a serration shape is formed on the side or edge of the light guide plate. A method has been used that allows LED light to spread out at a wider radiation angle towards the interior of the light guide plate.

1 illustrates a structure of a light guide plate having a conventional sawtooth shape.

Referring to FIG. 1, in the conventional light guide plate 100, a general light guide pattern 110 is formed on a lower surface of the light guide plate 100, and a sawtooth shape 120 is formed on one side of the light incident part so that the light of the light source is inside the light guide plate. It has a structure that can be extended to a wider radial angle toward.

However, the prior art has a problem that the tooth shape is inseparable from the light guide plate, thereby increasing the mold manufacturing cost and increasing the defective rate due to the complicated mold structure.

In addition, the prior art has a problem that the heat generated from the LED (LED) light source is directly transmitted to the light guide plate melting the mirror surface of the inlet.

The technical problem to be solved by the present invention is to provide a backlight device having a structure in which the tooth shape including a toothed coupling plate formed with an embossed or intaglio serrated shape that can be freely attached to one side of the light receiving surface of the light guide plate. have.

The present invention for achieving the above technical problem provides a structure in which the tooth-shaped coupling plate and the tooth-shaped coupling plate is formed in a certain area of the light guide plate light-incident surface.

The present invention has a technical effect of separately manufacturing the tooth shape to the light guide plate and attaching it, thereby simplifying the mold structure to lower the mold cost and defective rate.

In addition, the present invention has a technical effect of preventing the damage caused by the physical collision between the light source and the light guide plate by using an elastic transparent material, and reduce the heat transfer between the high heat and the light guide plate generated from the light source.

1 illustrates a structure of a light guide plate having a conventional sawtooth shape.
FIG. 2 is a view illustrating a concept in which the toothed coupling plate having the sawtooth shape of the present invention is attached to and detached from one side of the light incidence part of the light guide plate.
Figures 3a-3d show the first to fourth embodiments of the removable tooth shape of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a view illustrating a concept in which the toothed coupling plate having the sawtooth shape of the present invention is attached to and detached from one side of the light incidence part of the light guide plate.

Referring to FIG. 2, the toothed coupling plate 200 of the present invention has a structure capable of freely coupling to one side of the light incident surface 150 of the light guide plate 100.

 Here, the light incident surface 150 refers to one surface of the incidence side where the light emitted by the light source (not shown) reaches the front side.

The sawtooth coupling plate 200 has an embossed or intaglio serration shape 220 on one side of the plate, and is formed in the same size or smaller size than the side of the light incident surface 150 of the light guide plate. can do.

At this time, a laser processing method, an injection molding method, a press molding method, a stamp molding method, a pressure molding method, an imprinting method, an extrusion molding method, etc. may be used as a method for processing the tooth shape on the tooth-shaped coupling plate 200.

On the other hand, it is obvious that various coupling forms, structures, methods, materials, and the like may be appropriately selected so that one side of the tooth-shaped coupling plate 200 and the light incident surface 150 of the light guide plate 100 are easily detached from each other.

In this case, the toothed coupling plate 200 is a transparent material having elasticity such as silicone resin, urethane, polystyrene (PC), polycarbonate (PET), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), etc. It can be used as a long rod-shaped plate (plate).

The light guide plate 100 may use PMMA (polymethyl methacrylate) as an acrylic resin whose main material is a transparent resin that transmits light, such as MMA (Methyl Meth Acrylate) monomer (Monomer).

 In this case, the toothed coupling plate 200 may be attached to and detached from the light guide plate 100 by using an interfacial adhesive property of each of the materials used in the toothed coupling plate 200 or by using an adhesive. Of course, it is possible to apply a variety of applications without being limited.

Figures 3a-3d show the first to fourth embodiments of the removable tooth shape of the present invention.

Referring to FIG. 3A, the sawtooth coupling plate 200 includes an intaglio-type triangular pattern 220a formed by neighboring intaglio triangular patterns having two identical shapes on the light incident surface, or two triangular patterns having two identical shapes. It includes a bilateral triangular triangular pattern (220a ') formed adjacent to.

In this case, the toothed coupling plate 200 may be formed with a plurality of intaglio triangular patterns 220a and a plurality of biangular triangular patterns 220a 'at regular intervals on the light incident surface.

In this case, when the height of the triangle is H and the length of the base is L for each of the intaglio triangular pattern 220a and the biangular triangular pattern 220a ', the H / L value is formed to be in the range of 0.4 to 2. It is preferable to. Since the value of H / L is more than 0.4, the light of the light source can be spread evenly. If the value is more than 2, the efficiency of the light guide plate decreases by more than 20%, which is not preferable.

Referring to FIG. 3B, the sawtooth coupling plate 200 includes an intaglio triangular pattern 220b formed by adjacent two intaglio triangle patterns having two different sizes on a light incident surface, or an inverted triangle having two different sizes. The pattern includes an embossed triangular pattern 220b 'formed adjacent to each other.

In this case, the toothed coupling plate 200 may be formed with a plurality of indented triangular patterns 220b and a plurality of embossed triangular patterns 220b 'at regular intervals on the light incident surface.

Referring to FIG. 3C, the sawtooth coupling plate 200 has an intaglio circular arc pattern 220c or two embossed arcs having an identical arc shape, an ellipse, or a curved pattern adjacent to the light incident surface. The circular arc, ellipse or curved pattern of the bilateral arc pattern includes a circular arc pattern (220c ') formed adjacent.

In this case, the saw-tooth coupling plate 200 may be formed with a plurality of intaglio circular arc patterns 220c and a plurality of bilateral arc circular arc patterns 220c 'at regular intervals on the light incident surface.

In this case, if the height of the arc, ellipse or curve is H and the length of the base is L for each of the intaglio circular arc pattern 220c and the embossed circular arc pattern 220c ', the value of H / L is 0.4 to 2. It is possible to spread the light of the light source evenly from H / L value of 0.4 or more, and if the value exceeds 2, the efficiency of the light guide plate is less than 20%, which is not preferable.

Referring to FIG. 3D, the sawtooth coupling plate 200 has a negative arc pattern 220d or two different sizes formed by neighboring negative arcs, ellipses, or curved patterns having two different sizes on the light incident surface. The embossed triangular pattern has a bilateral arc pattern 220d 'formed adjacent to each other.

In this case, the toothed coupling plate 200 may be formed with a plurality of indented arc patterns 220d and a plurality of embossed arc patterns 220d 'at regular intervals on the light incident surface.

Meanwhile, in the case of the present invention, the sawtooth-shaped cross section has been exemplified for a triangle, an arc, an ellipse, or a curve, but the present invention is not limited thereto and can be implemented in various forms.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention.

100: light guide plate
110: light guide pattern
120: tooth shape
150: light incident surface
200: tooth shape joining plate
220: tooth shape pattern
220a: embossed isometric triangle pattern 220a ': embossed isometric triangle pattern
220b: embossed triangular pattern 220b ': embossed triangular pattern
220c: embossed isometric arc pattern 220c ': embossed isometric arc pattern
220d: embossed hetero arc pattern 220d ': embossed hetero arc pattern

Claims (7)

A backlight device having a structure in which a sawtooth coupling plate is coupled to a light guide plate, wherein a sawtooth coupling plate having a serrated shape having a constant embossed or intaglio is coupled to a light incident surface of the light guide plate. According to claim 1, wherein the toothed coupling plate,
Tooth-shaped bonding plate is formed using at least one of a silicone resin, urethane, polyurethane (PS), polycarbonate (PC), polyethylene terephthalate (PET), and polymethyl methacrylate (PMMA). A backlight device having a structure coupled to the light guide plate. According to claim 2, The serrated coupling plate,
A backlight device having a structure in which a sawtooth coupling plate is bonded to a light guide plate by using an interfacial adhesion property of the material used or by using an adhesive. The method of claim 1, wherein the sawtooth shape,
A backlight device having a structure in which a sawtooth coupling plate is coupled to a light guide plate, wherein the sawtooth shape has a structure in which a cross section has a triangle shape or an arc, an ellipse, or a curved shape. The toothed coupling plate according to claim 4, wherein when the sawtooth-shaped cross section has a triangle or an arc, an ellipse or a curved shape, the sawtooth coupling plate has a shape in which a plurality of tooth shapes are attached to each other or spaced apart from each other. A backlight device having a structure coupled to the light guide plate. The method of claim 5, wherein the sawtooth shape,
When the height of the triangle or arc, ellipse or curve is H and the length of the base is L, the backlight having a structure in which the sawtooth coupling plate is coupled to the light guide plate, characterized in that the value of H / L is in the range of 0.4 to 2. Device. The method of claim 1, wherein the sawtooth shape,
The saw-tooth coupling plate has a structure that is bonded to the light guide plate, characterized in that formed using at least one method of laser processing method, injection molding method, press molding method, stamp molding method, pressure molding method, imprinting method, extrusion molding method. Backlight device.
KR1020110145423A 2011-12-29 2011-12-29 Back light unit having structure serration patterned plate coupled with light guide plate KR20130076970A (en)

Priority Applications (1)

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KR1020110145423A KR20130076970A (en) 2011-12-29 2011-12-29 Back light unit having structure serration patterned plate coupled with light guide plate

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KR1020110145423A KR20130076970A (en) 2011-12-29 2011-12-29 Back light unit having structure serration patterned plate coupled with light guide plate

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104696743A (en) * 2013-12-04 2015-06-10 富士通株式会社 Illumination device and apparatus provided with illumination device
WO2015137612A1 (en) * 2014-03-14 2015-09-17 동부라이텍 주식회사 Lighting apparatus
CN105278028A (en) * 2014-06-20 2016-01-27 群创光电股份有限公司 Light guide plate and display device using light guide plate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104696743A (en) * 2013-12-04 2015-06-10 富士通株式会社 Illumination device and apparatus provided with illumination device
WO2015137612A1 (en) * 2014-03-14 2015-09-17 동부라이텍 주식회사 Lighting apparatus
CN105278028A (en) * 2014-06-20 2016-01-27 群创光电股份有限公司 Light guide plate and display device using light guide plate

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