KR20130135483A - The light guide plate - Google Patents

The light guide plate Download PDF

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Publication number
KR20130135483A
KR20130135483A KR1020120059073A KR20120059073A KR20130135483A KR 20130135483 A KR20130135483 A KR 20130135483A KR 1020120059073 A KR1020120059073 A KR 1020120059073A KR 20120059073 A KR20120059073 A KR 20120059073A KR 20130135483 A KR20130135483 A KR 20130135483A
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KR
South Korea
Prior art keywords
guide plate
fixing groove
light guide
intaglio pattern
light
Prior art date
Application number
KR1020120059073A
Other languages
Korean (ko)
Inventor
장태갑
류득수
김민정
두준길
배한국
조춘성
Original Assignee
코오롱인더스트리 주식회사
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.)
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Publication date
Application filed by 코오롱인더스트리 주식회사 filed Critical 코오롱인더스트리 주식회사
Priority to KR1020120059073A priority Critical patent/KR20130135483A/en
Publication of KR20130135483A publication Critical patent/KR20130135483A/en

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Classifications

    • 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
    • G02B6/0065—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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (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 relates to a light guide plate used for a backlight unit. The light guide plate comprises an optical reflecting protrusion formed at one side and a fixing groove formed at the edge. The light guide plate is capable of preventing light from flashing as an intaglio pattern is formed at the upper or lower surface of the fixing groove.

Description

Light guide plate {The light guide plate}

The present invention relates to a light guide plate used in a backlight unit.

Liquid crystal display (LCD) mainly uses a back light unit (BLU), and the backlight unit includes a light emitting diode (LED), a light guide plate, a reflector, a diffusion plate, a diffusion film, Various parts such as prism film are used.

Recently, when using a light source LED, it is necessary to arrange the LED light source only on some side in an edge type to make the brightness of the entire screen uniform. Especially, as the TV screen is enlarged, the function of the light guide plate becomes very important.

As shown in FIG. 1, the light guide plate 100 spreads the light L in introduced from the LED 210 of the light source module 200 installed on a part of the light source, and spreads the light into the entire surface. The light reflection protrusion 110 is formed on one surface of the light guide plate 100 to be emitted to the vertical upper portion L up .

In addition, in order to fix the light guide plate 100 to the BLU module so as not to move, a plurality of fixing grooves 120 are installed at the edges, and the number of the fixing grooves 120 may be appropriately determined according to the size of the TV screen. .

By the way, the fixing groove 120 is mainly formed at the edge where the effective image of the TV is not formed, but as shown in Figs. 2 and 3, the light (Lin) introduced from the side is reflected in the vertical horizontal (Lno), the TV The reflected light toward the effective image of the light will cause a bright light phenomenon.

As various studies have been conducted to eliminate such light phenomena, recently, as shown in FIG. 4, the method of attaching the retroreflective film 130 to the upper and / or lower surfaces of the light guide plate 100 has a length in which fixing grooves are formed. However, as shown in FIG. 5, the effect is negligible in removing the light phenomenon. In order to attach the retroreflective film to the edge portion of the light guide plate, the retroreflective film must be attached again after manually removing it so as to attach the retroreflective film to the protective film to protect the upper and lower surfaces of the light guide plate when manufacturing the light guide plate. This is cumbersome, and accordingly there is a problem that the production cost is also significantly increased.

An object of the present invention is to provide a light guide plate from which light phenomena are removed.

As a first preferred embodiment of the present invention, a light guide plate having a fixing groove at an edge thereof is provided, and a light guide plate having an intaglio pattern is formed on an upper surface or a lower surface of the fixing groove.

In the light guide plate according to the embodiment, the intaglio pattern formed on the upper surface of the fixing groove may be formed horizontally with respect to the fixing groove, and may be formed perpendicular to the fixing groove of the intaglio pattern formed on the lower surface of the fixing groove.

In the light guide plate according to the embodiment, the intaglio pattern formed on the upper surface of the fixing groove portion is 3 ~ 10mm in length, the intaglio pattern formed on the lower surface of the fixing groove portion may be 3 to 5mm in length.

The intaglio pattern according to the embodiment may have a shape of hemisphere or polygon.

The intaglio pattern according to the embodiment may be a hemisphere whose shape is different in aspect ratio.

The intaglio pattern according to the embodiment may be formed by laser processing.

According to the present invention, it is possible to provide a light guide plate in which the light phenomena are effectively removed, and the process for removing the light phenomena is also simplified, thereby reducing the production cost.

1 is a conceptual diagram of a conventional light guide plate.
2 is a diagram illustrating an optical path of a conventional light guide plate.
Figure 3 is a photograph of the light beam phenomenon of the conventional light guide plate.
4 is a conceptual view of a conventional light guide plate (with retroreflective film) improved.
5 is a photograph of the light phenomena of the conventional light guide plate (with retroreflective film) improved.
6 is a partially enlarged photograph of an upper surface of a light guide plate having an intaglio pattern formed on an upper surface of a fixing groove according to the present invention.
FIG. 7 is a schematic view illustrating an upper surface of a fixing groove in which a negative pattern may be formed in the light guide plate according to the present invention.
8 is a partially enlarged view of an upper surface of the fixing groove in which the intaglio pattern may be formed in the light guide plate according to the present invention.

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

The present invention relates to a light guide plate having a fixing groove formed at an edge thereof and having a negative pattern formed on an upper surface or a lower surface of the fixing groove. In this case, the upper surface of the fixing groove is a portion of the upper surface of the upper surface of the light guide plate centered on the fixing groove, and specifically, means a portion of 0.001 to 0.01% of the total width of the upper surface of the light guide plate based on the edge of the light guide plate. In addition, the lower surface of the fixing groove is a part of the lower surface of the lower surface of the light guide plate centering on the fixing groove, and specifically, means a portion of 0.001 to 0.01% of the total width of the lower surface of the light guide plate on the basis of the edge of the light guide plate (FIG. 7). ).

For example, if the upper surface or the lower surface of the fixing groove portion in which the intaglio pattern is formed is defined in another manner, the upper surface or the lower surface of the fixing groove portion in which the intaglio pattern is formed is 2 to the inner direction of the light guide plate based on the inner end of the fixing groove portion. It can be referred to as an area formed within the range of 5mm. If it is formed in the outward direction of the light guide plate based on the inner end point of the fixing groove of the intaglio pattern, there is no effect of improving light phenomena, and if it is formed to a range exceeding 5 mm in the inner direction of the light guide plate based on the inner end point of the fixing groove part This is because the intaglio pattern is visually recognized (Fig. 8).

The light guide plate according to the present invention does not reflect the light introduced from the side surface by light scattering by the intaglio pattern formed on the upper surface or the lower surface of the fixing groove portion, thereby eliminating light phenomena. At this time, when the intaglio pattern is formed on both the upper and lower surfaces of the fixing groove part, the amount of reflection is increased due to the excess of the pattern, so that the intaglio pattern part is visually recognized. It is preferably formed.

That is, in order to prevent the light guide plate from being fixed to the BLU module, a plurality of fixing grooves are installed at the edges, and fixing pins are installed in the fixing grooves. An intaglio pattern formed on the upper or lower surface of the fixing groove is located at the side of the light guide plate. It scatters the light from the LED to the fixing pin and scatters the light reflected from the fixing pin so that it is not concentrated in the light guide plate fixing groove.

In order to control the light transmitted and reflected through the light guide plate, an intaglio pattern controlling both incident and outgoing light is more effective than an embossed pattern for controlling the outgoing light.

As shown in FIG. 6, the intaglio pattern 300 formed on the upper surface 121 of the fixing groove portion may be formed horizontally with respect to the fixing groove portion 120, and may have a length of 3 to 10 mm.

In the case of the light guide plate in which light is incident from the vertical direction with respect to the fixing groove, and the lenticular pattern is formed on the upper surface, the lenticular pattern of the upper surface of the light guide plate is also formed perpendicular to the fixing groove, so that the negative pattern formed on the upper surface of the fixing groove is When formed in the horizontal direction with respect to the light scattering angle is increased to be advantageous to prevent the appearance of light.

If the length of the intaglio pattern formed on the upper surface of the fixing groove is less than 3mm, the incident light may not be scattered through the intaglio pattern.If the length of the intaglio pattern is greater than 10mm, the pattern may be perceived by the human eye rather than the light scattering effect. have.

In addition, the intaglio pattern formed on the lower surface of the fixing groove is formed perpendicular to the fixing groove, the length may be 3 ~ 5mm.

When the intaglio pattern formed on the lower surface of the fixing groove is formed in the horizontal direction with respect to the fixing groove, there is a problem in that the shape of the intaglio pattern itself is recognized by reflecting light incident on the lower surface of the light guide plate, while in the vertical direction with respect to the fixing groove. When formed, the light incident on the lower surface of the light guide plate is dispersed in a plurality of images, thereby fainting the light beam.

If the length of the intaglio pattern formed on the lower surface of the fixing groove is less than 3mm, the light scattering effect is insignificant, and if it is more than 5mm, the shape of the intaglio pattern itself is recognized.

On the other hand, the intaglio pattern formed on the upper or lower surface of the fixing groove portion may be hemispherical or polygonal in shape, in particular, the hemisphere may have a different aspect ratio. In this case, the aspect ratio may be determined by the amount of energy of the laser when the intaglio pattern is formed by laser processing. When the width L of the intaglio pattern decreases, the depth D decreases, and when the width L increases, the depth D also increases. Increases. The aspect ratio (D: L) is advantageously 1: 1.5 to 1.5: 1 to prevent glare.

On the other hand, by adjusting the density of the intaglio pattern formed on the upper or lower surface of the fixing groove may be minimized light. At this time, the density of the intaglio pattern may be adjusted according to the TCV model, the LED position and the shape of the fixing groove.

In the light guide plate according to the present invention, the intaglio pattern formed on the upper or lower surface of the fixing groove portion may be formed by laser processing, and if the intaglio pattern is formed by laser processing, there is no need to use a material for forming the intaglio pattern, thus contaminating the product. And there is no fear of deterioration, there is an effect that the light loss problem is reduced compared to the method of coating or blocking the color used in the general pattern process.

The present invention will now be described in detail with reference to specific examples. However, it should be understood that the present invention is not limited to these embodiments and that various changes and modifications may be made therein without departing from the scope of the present invention. Of course.

Examples 1-5 and Comparative Examples 1-5

Using a laser pattening device (Hangwang Opto Co., Ltd.) on a light guide plate (KOLON Industries, Inc., AL232) in which the fixing groove was formed, an intaglio pattern having a formation position, shape, length, and spacing as shown in Table 1 was formed.

About the light guide plate of an Example and a comparative example, visual glare phenomenon was evaluated by the following method, and the result is shown in Table 1.

<Lightning phenomenon evaluation criteria>

Good: no glare

Negative pattern area visual recognition: Negative pattern shape recognized

Poor: A luminous phenomenon is observed

Intaglio pattern Evaluation Formation location Forming direction based on fixing groove shape Length (diameter) interval Example 1 Top level hemisphere 8mm 0.5mm Good Example 2 Top level hemisphere 10mm 0.5mm Good Example 3 Top level hemisphere 5mm 0.5mm Good Example 4 if Perpendicular hemisphere 3mm 0.5mm Good Example 5 if Perpendicular hemisphere 5mm 0.5mm Good Comparative Example 1 Top level hemisphere 15mm 0.5mm Poor visibility of the intaglio pattern area Comparative Example 2 Top Perpendicular hemisphere 3mm 0.5mm Bad Comparative Example 3 Top Perpendicular hemisphere 5mm 0.5mm Bad Comparative Example 4 if level hemisphere 2mm 0.5mm Bad Comparative Example 5 if level hemisphere 7mm 0.5mm Poor visibility of the intaglio pattern area Comparative Example 6 if level hemisphere 5mm 0.5mm Bad

As a result of the physical property evaluation, as shown in Table 1, when the hemispherical intaglio pattern of the appropriate size is formed on the upper surface of the light guide plate fixing groove portion, when it is formed horizontally based on the fixing groove portion (Examples 1 to 3), the fixing groove When formed on the lower surface of the negative can be seen that the light evaluation results are observed well when formed vertically based on the fixing groove.

On the other hand, although the intaglio pattern is formed horizontally on the upper surface of the fixing groove, the intaglio pattern is too large (Comparative Example 1) and the intaglio pattern is formed vertically on the lower surface of the fixing groove, but the size of the intaglio pattern is excessive. If large (Comparative Example 5), it can be seen that the poor visibility of the intaglio pattern area appears.

In addition, when the intaglio pattern is formed vertically on the upper surface of the fixing groove (Comparative Examples 2 and 3), or when the intaglio pattern is formed horizontally on the lower surface of the fixing groove (Comparative Examples 4 and 5), the light phenomenon is observed. have.

100: light guide plate, 110: light reflecting projection, 120: fixing groove, 121: upper surface of the fixing groove, 122: lower surface of the fixing groove, 123: inner surface of the fixing groove, 130: retroreflective film,
140: antireflection layer
200: light source module, 210: LED
300: intaglio pattern

Claims (6)

In the light guide plate formed with a fixing groove at the edge,
The light guide plate, characterized in that the intaglio pattern is formed on the upper or lower surface of the fixing groove.
The method of claim 1,
The intaglio pattern formed on the upper surface of the fixing groove is formed horizontally with respect to the fixing groove,
The light guide plate is formed perpendicular to the fixing groove of the intaglio pattern formed on the lower surface of the fixing groove.
The method of claim 1,
The intaglio pattern formed on the upper surface of the fixing groove is 3 ~ 10mm in length,
The intaglio pattern formed on the lower surface of the fixing groove is a light guide plate, characterized in that the length is 3 ~ 5mm.
The method of claim 1,
The intaglio pattern is a light guide plate, characterized in that the shape is hemisphere or polygon.
5. The method of claim 4,
The intaglio pattern is a light guide plate, characterized in that the shape is a hemisphere having a different aspect ratio.
The method of claim 1,
The intaglio pattern is a light guide plate, characterized in that formed by laser processing.
KR1020120059073A 2012-06-01 2012-06-01 The light guide plate KR20130135483A (en)

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KR1020120059073A KR20130135483A (en) 2012-06-01 2012-06-01 The light guide plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120059073A KR20130135483A (en) 2012-06-01 2012-06-01 The light guide plate

Publications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016155050A1 (en) * 2015-04-02 2016-10-06 深圳市华星光电技术有限公司 Backlight unit and display device
US9897381B2 (en) 2016-03-25 2018-02-20 Wuhan China Star Optoelectronics Technology Co., Ltd. Supporting structure and oven

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016155050A1 (en) * 2015-04-02 2016-10-06 深圳市华星光电技术有限公司 Backlight unit and display device
US10197720B2 (en) 2015-04-02 2019-02-05 Shenzhen China Star Optoelectronics Technology Co., Ltd Backlight module and display device
US9897381B2 (en) 2016-03-25 2018-02-20 Wuhan China Star Optoelectronics Technology Co., Ltd. Supporting structure and oven

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