WO2011021738A1 - Backlight device - Google Patents

Backlight device Download PDF

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Publication number
WO2011021738A1
WO2011021738A1 PCT/KR2009/004666 KR2009004666W WO2011021738A1 WO 2011021738 A1 WO2011021738 A1 WO 2011021738A1 KR 2009004666 W KR2009004666 W KR 2009004666W WO 2011021738 A1 WO2011021738 A1 WO 2011021738A1
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WO
WIPO (PCT)
Prior art keywords
light guide
guide plate
light
inclined surface
backlight device
Prior art date
Application number
PCT/KR2009/004666
Other languages
French (fr)
Korean (ko)
Inventor
유성일
Original Assignee
단비기술 유한회사
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 단비기술 유한회사 filed Critical 단비기술 유한회사
Priority to PCT/KR2009/004666 priority Critical patent/WO2011021738A1/en
Priority to PCT/KR2009/005690 priority patent/WO2011021741A1/en
Publication of WO2011021738A1 publication Critical patent/WO2011021738A1/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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • 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
    • G02B6/0045—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 by shaping at least a portion of the light guide
    • 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
    • G02B6/0018—Redirecting means on the surface of the light guide
    • 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
    • G02B6/002—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 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—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 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • 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
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer

Definitions

  • the present invention relates to a backlight device such as a liquid crystal display device, a backlight for illumination, and more particularly, at least one inclined surface is formed in the light guide plate, and the edge portion of the light guide plate is oblique at an angle of the upper edge of the inclined surface formed on the light guide plate. It relates to a backlight device for minimizing the strong light emission caused by.
  • a light guide panel is a plate that provides a path for uniformly scattering and diffusing light from a light source, and is applied to a light receiving type flat panel display device such as a liquid crystal display device or a backlight device used for lighting. .
  • a method of disposing a cold cathode fluorescent lamp (CCFL) or an LED is widely used.
  • FIG. 1 is a cross-sectional view schematically showing a conventional backlight device.
  • the conventional backlight device 10 includes a light guide plate 11, a first reflector 12 disposed below the light guide plate 11, a light source 13 provided at a side surface of the light guide plate 11, The second reflector 14 provided on the other side of the light guide plate 11 is included.
  • a cold cathode fluorescent lamp or an LED may be used as the light source.
  • the light guide plate 11 is formed with a plurality of light guide patterns 12 for uniformly guiding light incident into the light guide plate 11.
  • the backlight device 10 configured as described above, light from the light source 13 is incident on the light guide plate 11, and the incident light is guided through the light guide plate 11, as indicated by the arrow, and then the light guide pattern 12. After being refracted or scattered out of the light guide plate 11 and exiting to the outside of the light guide plate 11, it is reflected by the first reflector 12 or immediately exits to the upper surface and passes through the upper diffuser 15 or prism 16, thereby being relatively uniform. You get one surface light source.
  • the light emitted from the light source 13 when the light emitted from the light source 13 is incident on the second reflector 14, the light may be reflected back into the light guide plate 11, but a part of the light may be strongly emitted to the front surface of the light guide plate 11 to form a bright curve around the edge.
  • an object of the present invention is to improve the appearance quality by minimizing the strong light emission at the corner of the light guide plate while increasing the light efficiency without using an additional reflector.
  • the purpose is to provide.
  • a backlight device includes a light source, a light guide plate for uniformly guiding light emitted from the light source, a light guide pattern provided on at least one surface of the light guide plate, a reflector disposed below the light guide plate,
  • a backlight device including a diffusion material provided on an upper portion of the light guide plate at least one inclined surface is formed on the light guide plate, and the strong light emission caused by the edge portion of the light guide plate is formed by setting an obtuse angle of an upper edge of the inclined surface formed on the light guide plate. It is characterized in that to minimize.
  • the inclined surface formed on the light guide plate has a straight or curved shape, and the inclined surface formed on the light guide plate is formed by NC processing, injection, extrusion, or laser processing.
  • the light guide pattern is formed on both the upper and lower surfaces of the light guide plate, or the light guide pattern is formed on the inclined surface.
  • the light source is characterized in that provided on the lower surface of the light guide plate.
  • a backlight device includes at least one light source, at least one light guide plate for uniformly guiding light emitted from the light source, a light guide pattern provided at at least one surface of the light guide plate,
  • the backlight device comprising a reflector provided on the lower portion of the at least one light guide plate, and a diffusing material provided on the at least one light guide plate, at least one inclined surface is formed on each of the at least one light guide plate, the upper edge of the inclined surface is formed at an obtuse angle
  • the inclined surface formed on the light guide plate has a straight or curved shape, and the inclined surface formed on the light guide plate is formed by NC processing, injection, extrusion, or laser processing.
  • the light guide pattern is formed on both the upper and lower surfaces of the light guide plate, or the light guide pattern is formed on the inclined surface.
  • At least one inclined surface is formed on the light guide plate, and the angle of the upper edge of the inclined surface is obtuse, thereby minimizing strong light emission at the corner of the light guide plate, thereby improving appearance quality.
  • FIG. 1 is a cross-sectional view showing a conventional backlight device.
  • FIG. 2 is a side cross-sectional view of a backlight device according to a first embodiment of the present invention.
  • FIG 3 is a side cross-sectional view of a backlight device according to a second embodiment of the present invention.
  • FIG. 4 is a side cross-sectional view of a backlight device according to a third embodiment of the present invention.
  • FIG. 5 is a plan view of the backlight device of FIG. 4 of the present invention.
  • FIG. 6 is a side cross-sectional view showing various shapes of the inclined surfaces of the first to third embodiments of the present invention.
  • FIG. 2 is a side cross-sectional view of a backlight device according to a first embodiment of the present invention.
  • a light guide plate 201 is provided in the backlight device 200.
  • the light guide pattern 201a is formed on the upper surface, the lower surface, or the entire upper and lower surfaces of the light guide plate 201.
  • At least one light source 202 is provided on the side of the light guide plate 201.
  • One or more inclined surfaces 203 are formed on the other side of the light guide plate 201 where the light source 202 is not provided.
  • the lower portion of the light guide plate 201 is provided with a reflector 204 that can reflect light emitted from the lower surface of the light guide plate 201 to the top.
  • a diffusion material 205 for scattering and diffusing light is provided on the light guide plate 201.
  • the light emitted from the light source 202 is incident to the light guide plate 201, and the incident light is guided to the inside of the light guide plate 201 by guiding the inside of the light guide plate 201. Thereafter, the light propagated into the light guide plate 201 is reflected, refracted, and scattered by the light guide pattern 201a, and the light is emitted to the outside of the light guide plate 201.
  • the light emitted to the lower surface of the light guide plate 201 is reflected through the reflector 204, passes through the light guide plate 201, and then passes through the diffuser 205 on the upper surface of the light guide plate 201 to be emitted to the front surface.
  • the light guide pattern 201a can obtain a uniform surface light source by increasing the pattern density at a part far from the light source 202 and lowering the pattern density at a part near the light source 202.
  • the light guide pattern 201a may be positioned on the inclined surface 203.
  • the light source 202 may use a cold cathode fluorescent lamp or an LED.
  • the light incident on the inclined surface 203 is totally reflected to the lower surface of the light guide plate 201 by the inclination of the inclined surface 203 and the light reflected to the lower surface again moves inside the light guide plate 201 or installed on the lower surface of the light guide plate 201.
  • the reflecting material 204 is emitted to the upper surface of the light guide plate 201.
  • the light that does not meet the total reflection condition on the inclined surface 203 is emitted to the outside of the inclined surface 203 when the front surface light source is viewed from the front so that the dark portion does not occur on the inclined surface 203.
  • Such inclined surfaces can be processed using various methods such as laser machining, NC machining, injection molding, and extrusion molding.
  • FIG 3 is a side cross-sectional view of a backlight device according to a second embodiment of the present invention.
  • one or more light sources 202 are provided on the lower surface instead of the side.
  • a separate reflector 206 or partial processing of the light guide plate 201 should be added to allow the light from the light source 202 to enter the light guide plate 201.
  • the light source 202 when the light source 202 is located on the lower surface of the light guide plate 201, the light source 202 does not occupy a separate space when viewed from the top surface. Therefore, when connecting the plurality of light guide plates 201 can be installed compactly without a margin, there is an advantage that can be designed so that the connection portion between the light guide plate 201 and the light guide plate 201 is not visible. In this manner, in the edge light type backlight device 200 using the light guide plate 201, the light efficiency of the light guide plate 201 can be increased without installing additional reflectors, and the appearance problem due to the strong light emission around the edges can be eliminated. Can be.
  • FIG. 4 is a side cross-sectional view of a backlight device according to a third embodiment of the present invention
  • FIG. 5 is a plan view of the backlight device of FIG. 4 of the present invention.
  • the backlight device 200 is provided with a plurality of light guide plates 201 arranged side by side.
  • the light guide pattern 201a is formed on at least one surface of the light guide plate 201.
  • One or more light sources 202 are disposed on the side surfaces of the plurality of light guide plates 201, and at least one inclined surface 203 is formed on the side surfaces of the light guide plates 201 where the light sources 202 are not disposed.
  • the lower surface of the light guide plate 201 is provided with a reflector 204 for reflecting light emitted from the lower surface of the light guide plate 201 to the upper portion, and a diffusion material 205 for scattering and diffusing light on the upper portion of the light guide plate 201. ) Is installed.
  • Light from one or more light sources 202 installed on the side of the light guide plate 201 is incident into the light guide plate 201, and the light incident into the light guide plate 201 proceeds by guiding the inside of the light guide plate 201 by the total reflection effect. do.
  • Some of the light propagated into the light guide plate 201 is refracted or scattered by the light guide pattern 201a and emitted to the upper surface of the light guide plate 201, and the light emitted from the light guide pattern 201a is reflected through the reflector 204.
  • the light guide plate 201 After passing through the light guide plate 201 again, the light guide plate 201 passes through the diffusion material 205 on the upper surface of the light guide plate 201 and has a principle of exiting to the front surface.
  • the light guide pattern 201a has a high density at the portion far away from the light source 202 in each of the light guide plates 201, and has a low density at a portion relatively close to the light source 202 so as to provide a uniform surface light source. Can be obtained.
  • the light source 202 is made of a combination of a plurality of LEDs and may be used by installing a plurality of light sources 202 on one substrate.
  • the light guide pattern 201a may be positioned on the inclined surface 203.
  • the light incident on the inclined surface 203 is totally reflected to the lower surface of the light guide plate 201 by the inclination of the inclined surface 203 and the light reflected to the lower surface again moves inside the light guide plate 201 or installed on the lower surface of the light guide plate 201.
  • the reflecting material 204 is emitted to the upper surface of the light guide plate 201.
  • some of the light that does not meet the total reflection condition on the inclined surface 203 is emitted to the outside of the inclined surface 203 when the front surface light source is viewed from the front so that the dark portion does not occur on the inclined surface 203.
  • the inclined surface 203 can be processed by various methods such as laser processing, NC processing, injection molding, extrusion molding.
  • FIG. 6 is a side sectional view showing various shapes of the inclined surfaces of the first to third embodiments of the present invention.
  • the angle ⁇ of the corner is an obtuse angle exceeding 90 degrees, preferably around 135 degrees.
  • the shape of the inclined surface 203 may be a straight line shape as shown in (a), an arc shape having a predetermined curvature as a whole as shown in (b), or a predetermined upper portion as shown in (c). With a curvature of, the lower part can also be machined into a combination shape that is straight. Shapes of the inclined surface of Figure 6 is only one embodiment, it is apparent that it can be implemented by various modifications, such as curves, according to the needs of those skilled in the art.

Abstract

Disclosed is a backlight device. The backlight device comprises: a light source; a light guide panel which uniformly guides the light emitted from the light source; light guide patterns which are installed on at least one side of the light guide panel; a reflection member which is installed in the lower part of the light guide panel; and a diffusion member which is installed in the upper part of the light guide panel, wherein at least one inclined surface is formed on the light guide panel, and the angle of the upper edges of the inclined surface formed on the light guide plate is set to an obtuse angle in such a manner that a strong emission of light produced from the edge part of the light guide panel is minimized.

Description

백라이트 장치Backlit device
본 발명은 액정표시소자, 조명용 백라이트 등의 백라이트 장치에 관한 것으로서, 더욱 상세하게는 도광판에는 적어도 하나 이상의 경사면이 형성되고, 도광판에 형성되는 경사면의 상부 모서리의 각도를 둔각으로 함으로써, 도광판의 에지부에 야기되는 강한 발광을 최소화하기 위한 백라이트 장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device such as a liquid crystal display device, a backlight for illumination, and more particularly, at least one inclined surface is formed in the light guide plate, and the edge portion of the light guide plate is oblique at an angle of the upper edge of the inclined surface formed on the light guide plate. It relates to a backlight device for minimizing the strong light emission caused by.
통상적으로, 도광판(light guide panel)은 광원으로부터 나온 빛을 균일하게 산란 및 확산시키는 경로를 제공하는 플레이트로서, 액정 표시 소자와 같은 수광형 평판 표시 장치나, 조명 등에 사용되는 백라이트 장치에 적용되고 있다.In general, a light guide panel is a plate that provides a path for uniformly scattering and diffusing light from a light source, and is applied to a light receiving type flat panel display device such as a liquid crystal display device or a backlight device used for lighting. .
도광판을 사용한 백라이트 장치로는 냉음극 형광 램프(cold cathode fluorescent lamp, CCFL) 또는 LED를 배치하는 방식이 널리 사용되고 있다. As a backlight device using a light guide plate, a method of disposing a cold cathode fluorescent lamp (CCFL) or an LED is widely used.
도 1은 종래의 백라이트 장치를 개략적으로 도시한 단면도이다.1 is a cross-sectional view schematically showing a conventional backlight device.
도 1을 참조하면, 종래의 백라이트 장치(10)는 도광판(11)과, 도광판(11)의 하부에 설치된 제1 반사재(12)와, 도광판(11)의 측면에 설치된 광원(13)과, 도광판(11)의 타측면에 설치된 제2 반사재(14)를 포함한다. 광원으로는 냉음극 형광 램프 또는 LED 등이 사용될 수 있다. 도광판(11)에는 도광판(11) 내부로 입사된 빛을 균일하게 도광시키는 다수의 도광패턴(12)이 형성되어 있다.Referring to FIG. 1, the conventional backlight device 10 includes a light guide plate 11, a first reflector 12 disposed below the light guide plate 11, a light source 13 provided at a side surface of the light guide plate 11, The second reflector 14 provided on the other side of the light guide plate 11 is included. As the light source, a cold cathode fluorescent lamp or an LED may be used. The light guide plate 11 is formed with a plurality of light guide patterns 12 for uniformly guiding light incident into the light guide plate 11.
상기와 같이 구성된 백라이트 장치(10)는 광원(13)으로부터 나온 빛이 도광판(11)으로 입사되고, 입사된 광은 화살표로 표시한 바와 같이 도광판(11)을 통하여 도광된 다음에 도광패턴(12)에 의해 굴절 또는 산란되어 도광판(11)의 외부로 빠져 나간 후, 제1 반사재(12)에서 반사되거나 상면으로 바로 빠져나가서 상면의 확산재(15)나 프리즘(16)을 통과하게 됨으로써 비교적 균일한 면광원을 얻게 된다.In the backlight device 10 configured as described above, light from the light source 13 is incident on the light guide plate 11, and the incident light is guided through the light guide plate 11, as indicated by the arrow, and then the light guide pattern 12. After being refracted or scattered out of the light guide plate 11 and exiting to the outside of the light guide plate 11, it is reflected by the first reflector 12 or immediately exits to the upper surface and passes through the upper diffuser 15 or prism 16, thereby being relatively uniform. You get one surface light source.
그런데, 이때 광원(13)에서 나온 빛이 제2 반사재(14)에 입사된 경우 도광판(11) 내로 다시 반사되기도 하지만 일부는 도광판(11)의 전면으로 강하게 출사되어 모서리 주변에 밝은 휘부를 만든다.However, in this case, when the light emitted from the light source 13 is incident on the second reflector 14, the light may be reflected back into the light guide plate 11, but a part of the light may be strongly emitted to the front surface of the light guide plate 11 to form a bright curve around the edge.
만약 다수개의 도광판(11)을 조합한 대면적의 면광원을 구현하고자 하는 경우에는 모서리 주변에서의 이러한 밝은 휘부는 균일한 면광원을 구현하는데 큰 문제가 되며 이러한 휘부를 가려주기 위해서는 보다 많은 수의 광학 시트나 두꺼운 확산재가 추가로 소요되는 문제를 가진다.If a large area surface light source combining a plurality of light guide plates 11 is to be realized, such bright curves around the corners are a big problem to realize a uniform surface light source. There is a problem that an optical sheet or a thick diffuser is additionally required.
본 발명은 상기와 같은 문제점을 해결하기 위해 안출한 것으로, 본 발명의 목적은, 추가의 반사재를 사용하지 않고 광효율을 높이면서, 도광판 모서리 부위에서의 강한 발광을 최소화하여 외관 품질을 높일 수 있는 백라이트를 제공하는 것을 목적으로 한다.The present invention has been made to solve the above problems, an object of the present invention is to improve the appearance quality by minimizing the strong light emission at the corner of the light guide plate while increasing the light efficiency without using an additional reflector. The purpose is to provide.
상기의 목적을 달성하기 위하여 본 발명에 따른 백라이트 장치는, 광원과, 광원에서 나온 빛을 균일하게 도광시키는 도광판과, 도광판의 적어도 일면에 설치되는 도광패턴과, 도광판의 하부에 설치되는 반사재와, 도광판의 상부에 설치되는 확산재를 포함하는 백라이트 장치에 있어서, 도광판에는 적어도 하나 이상의 경사면이 형성되고, 도광판에 형성되는 경사면의 상부 모서리의 각도를 둔각으로 함으로써, 도광판의 에지부에 야기되는 강한 발광을 최소화하는 것을 특징으로 한다.In order to achieve the above object, a backlight device according to the present invention includes a light source, a light guide plate for uniformly guiding light emitted from the light source, a light guide pattern provided on at least one surface of the light guide plate, a reflector disposed below the light guide plate, In a backlight device including a diffusion material provided on an upper portion of the light guide plate, at least one inclined surface is formed on the light guide plate, and the strong light emission caused by the edge portion of the light guide plate is formed by setting an obtuse angle of an upper edge of the inclined surface formed on the light guide plate. It is characterized in that to minimize.
또한, 상기 도광판에 형성되는 경사면의 형상은, 직선 또는 곡선 형상을 가지며, 도광판에 형성되는 경사면은, NC 가공, 사출, 압출, 레이저 가공의 방법에 의해 형성된 것을 특징으로 한다.The inclined surface formed on the light guide plate has a straight or curved shape, and the inclined surface formed on the light guide plate is formed by NC processing, injection, extrusion, or laser processing.
또한, 상기 도광판의 상면과 하면 모두에 도광패턴이 형성되거나, 경사면에도 도광패턴이 형성된 것을 특징으로 한다.In addition, the light guide pattern is formed on both the upper and lower surfaces of the light guide plate, or the light guide pattern is formed on the inclined surface.
또한, 상기 광원이 도광판의 하면에 설치된 것을 특징으로 한다.In addition, the light source is characterized in that provided on the lower surface of the light guide plate.
본 발명의 제2 실시예에 따르면, 백라이트 장치가 제공되는데, 상기 백라이트 장치는 하나 이상의 광원과, 광원에서 나온 빛을 균일하게 도광시키는 하나 이상의 도광판과, 도광판의 적어도 일면에 설치되는 도광패턴과, 하나 이상의 도광판의 하부에 설치되는 반사재와, 하나 이상의 도광판의 상부에 설치되는 확산재를 포함하는 백라이트 장치에 있어서, 하나 이상의 도광판 각각에 하나 이상의 경사면이 형성되고, 경사면의 상부 모서리가 둔각으로 이루어지고, 하나 이상의 광원을 소정의 영역에서 구획되어 발광하도록 구동함으로써 로컬 디밍 효과를 구현하는 것을 특징으로 한다.According to a second embodiment of the present invention, a backlight device is provided, wherein the backlight device includes at least one light source, at least one light guide plate for uniformly guiding light emitted from the light source, a light guide pattern provided at at least one surface of the light guide plate, In the backlight device comprising a reflector provided on the lower portion of the at least one light guide plate, and a diffusing material provided on the at least one light guide plate, at least one inclined surface is formed on each of the at least one light guide plate, the upper edge of the inclined surface is formed at an obtuse angle By driving at least one light source is partitioned in a predetermined area to emit light, it is characterized in that to implement a local dimming effect.
또한, 상기 도광판에 형성되는 경사면의 형상은, 직선 또는 곡선 형상을 가지며, 도광판에 형성되는 경사면은, NC 가공, 사출, 압출, 레이저 가공의 방법에 의해 형성된 것을 특징으로 한다.The inclined surface formed on the light guide plate has a straight or curved shape, and the inclined surface formed on the light guide plate is formed by NC processing, injection, extrusion, or laser processing.
또한, 상기 도광판의 상면과 하면 모두에 도광패턴이 형성되거나, 경사면에도 도광패턴이 형성된 것을 특징으로 한다.In addition, the light guide pattern is formed on both the upper and lower surfaces of the light guide plate, or the light guide pattern is formed on the inclined surface.
상술한 바와 같이 본 발명에 따르면, 도광판에 적어도 하나의 경사면을 형성시키고, 경사면의 상부 모서리의 각도를 둔각으로 함으로써, 도광판 모서리 부위에서의 강한 발광을 최소화하여 외관 품질을 높일 수 있다.As described above, according to the present invention, at least one inclined surface is formed on the light guide plate, and the angle of the upper edge of the inclined surface is obtuse, thereby minimizing strong light emission at the corner of the light guide plate, thereby improving appearance quality.
도 1은 종래의 백라이트 장치를 도시한 단면도이다.1 is a cross-sectional view showing a conventional backlight device.
도 2는 본 발명의 제1 실시예에 따른 백라이트 장치의 측단면도이다.2 is a side cross-sectional view of a backlight device according to a first embodiment of the present invention.
도 3은 본 발명의 제2 실시예에 따른 백라이트 장치의 측단면도이다.3 is a side cross-sectional view of a backlight device according to a second embodiment of the present invention.
도 4는 본 발명의 제3 실시예에 따른 백라이트 장치의 측단면도이다.4 is a side cross-sectional view of a backlight device according to a third embodiment of the present invention.
도 5는 본 발명의 도 4의 백라이트 장치의 평면도이다.5 is a plan view of the backlight device of FIG. 4 of the present invention.
도 6은 본 발명의 제1 실시예 내지 제3 실시예의 경사면의 다양한 형상을 도시한 측단면도이다.6 is a side cross-sectional view showing various shapes of the inclined surfaces of the first to third embodiments of the present invention.
이하에서는 첨부 도면을 참조하여 본 발명에 따른 백라이트 장치에 대하여 바람직한 실시예를 상세히 설명하기로 한다. 그러나, 본 발명은 이하에서 개시되는 실시예에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 수 있으며, 단지 본 실시예는 본 발명의 개시가 완전하도록 하며 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이다.Hereinafter, a preferred embodiment of a backlight device according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and only the embodiments are intended to complete the disclosure of the present invention and to those skilled in the art. It is provided for complete information.
이하에서 첨부된 도면을 참조하면서 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.
도 2는 본 발명의 제1 실시예에 따른 백라이트 장치의 측단면도이다.2 is a side cross-sectional view of a backlight device according to a first embodiment of the present invention.
도　2를 참조하면, 백라이트 장치(200)에는 도광판(201)이 마련되어 있다. 도광판(201)의 상면, 하면 또는 상하면 전체에는 도광패턴(201a)이 형성되어 있다. 도광판(201)의 측면에는 하나 이상의 광원(202)이 설치되어 있다. 광원(202)이 설치되어 있지 않은 도광판(201)의 다른 측면에는 하나 이상의 경사면(203)이 형성되어 있다. 도광판(201)의 하부에는 도광판(201) 하면으로 나온 빛을 상부로 반사시킬 수 있는 반사재(204)가 설치되어 있다. 도광판(201)의 상부에는 빛을 산란 및 확산시키는 확산재(205)가 설치되어 있다.Referring to FIG. 2, a light guide plate 201 is provided in the backlight device 200. The light guide pattern 201a is formed on the upper surface, the lower surface, or the entire upper and lower surfaces of the light guide plate 201. At least one light source 202 is provided on the side of the light guide plate 201. One or more inclined surfaces 203 are formed on the other side of the light guide plate 201 where the light source 202 is not provided. The lower portion of the light guide plate 201 is provided with a reflector 204 that can reflect light emitted from the lower surface of the light guide plate 201 to the top. A diffusion material 205 for scattering and diffusing light is provided on the light guide plate 201.
광원(202)에서 나온 빛은 도광판(201) 내부로 입사되고, 입사된 빛은 도광판(201) 내부로 전반사 효과에 의해 경로가 바뀌어 도광판(201) 내부를 도광하여 진행한다. 이후 도광판(201) 내부로 진행된 빛은 도광패턴(201a)에 의해서 반사, 굴절 및 산란을 하고, 다시 그 빛은 도광판(201) 외부로 출사된다. 도광판(201) 하면으로 출사된 빛은 반사재(204)를 거쳐 반사되고 다시 도광판(201)을 통과한 후 도광판(201) 상면의 확산재(205)를 통과하여 전면으로 출사되는 원리를 가진다. 이 때 경사면(203)으로 입사된 빛의 일부는 도광판(201)의 하면으로 반사 또는 굴절되며 나머지는 경사면(203)의 바깥으로 출사된다. 이때, 도광패턴(201a)은 광원(202)에서 멀리 떨어진 부분은 패턴 밀도를 높게 하고, 광원(202)에서 가까운 부분은 패턴 밀도를 낮게 함으로써 균일한 면광원을 얻을 수 있다. 실시예에 따라서는 도광패턴(201a)은 경사면(203)에도 위치 할 수 있다. 광원(202)은 냉음극 형광램프 또는 LED를 사용할 수 있다.The light emitted from the light source 202 is incident to the light guide plate 201, and the incident light is guided to the inside of the light guide plate 201 by guiding the inside of the light guide plate 201. Thereafter, the light propagated into the light guide plate 201 is reflected, refracted, and scattered by the light guide pattern 201a, and the light is emitted to the outside of the light guide plate 201. The light emitted to the lower surface of the light guide plate 201 is reflected through the reflector 204, passes through the light guide plate 201, and then passes through the diffuser 205 on the upper surface of the light guide plate 201 to be emitted to the front surface. At this time, part of the light incident on the inclined surface 203 is reflected or refracted to the lower surface of the light guide plate 201, and the rest is emitted to the outside of the inclined surface 203. In this case, the light guide pattern 201a can obtain a uniform surface light source by increasing the pattern density at a part far from the light source 202 and lowering the pattern density at a part near the light source 202. In some embodiments, the light guide pattern 201a may be positioned on the inclined surface 203. The light source 202 may use a cold cathode fluorescent lamp or an LED.
한편, 경사면(203)에 입사되는 빛은 경사면(203)의 기울기에 의해 도광판(201)의 하면으로 전반사되고 하면으로 반사된 빛은 다시 도광판(201) 내부를 이동하거나 도광판(201) 하면에 설치된 반사재(204)에 의해 도광판(201) 상면으로 출사된다. 이 때 경사면(203)에서 전반사 조건을 충족하지 못한 빛은 경사면(203) 외부로 출사되어 전면에서 면광원을 바라 보았을 때 경사면(203)에서 암부가 생기지 않게 된다. 이러한 경사면은 레이저 가공, NC 가공, 사출 성형, 압출 성형 등 여러 가지 공법을 사용하여 가공할 수 있다.On the other hand, the light incident on the inclined surface 203 is totally reflected to the lower surface of the light guide plate 201 by the inclination of the inclined surface 203 and the light reflected to the lower surface again moves inside the light guide plate 201 or installed on the lower surface of the light guide plate 201. The reflecting material 204 is emitted to the upper surface of the light guide plate 201. At this time, the light that does not meet the total reflection condition on the inclined surface 203 is emitted to the outside of the inclined surface 203 when the front surface light source is viewed from the front so that the dark portion does not occur on the inclined surface 203. Such inclined surfaces can be processed using various methods such as laser machining, NC machining, injection molding, and extrusion molding.
한편, 도 3은 본 발명의 제2 실시예에 따른 백라이트 장치의 측단면도이다.3 is a side cross-sectional view of a backlight device according to a second embodiment of the present invention.
도 3을 참조하면, 도 2와 달리, 하나 이상의 광원(202)이 측면이 아닌 하면에 설치되어 있다. 이와 같은 방식에 의할 경우, 별도의 반사재(206)나 도광판(201)의 부분적인 가공을 추가하여 광원(202)에서 나온 빛이 도광판(201)의 내부로 들어갈 수 있도록 하여야 한다. 또한, 광원(202)이 도광판(201) 하면에 위치하는 경우에는 상면에서 바라보았을 때 광원(202)이 별도의 공간을 차지하지 않는다. 따라서 다수개의 도광판(201)을 연결하는 경우 여백이 없이 콤팩트 하게 설치할 수 있으므로, 도광판(201)과 도광판(201) 사이의 연결부위가 보이지 않게 설계할 수 있는 장점을 가진다. 이와 같은 방법으로 도광판(201)을 사용하는 에지라이트 방식의 백라이트 장치(200)에서는, 추가의 반사재 설치없이도 도광판(201)의 광효율을 높일 수 있고, 모서리 주변의 강한 발광에 의한 외관상 문제를 제거할 수 있다.Referring to FIG. 3, unlike FIG. 2, one or more light sources 202 are provided on the lower surface instead of the side. In this way, a separate reflector 206 or partial processing of the light guide plate 201 should be added to allow the light from the light source 202 to enter the light guide plate 201. In addition, when the light source 202 is located on the lower surface of the light guide plate 201, the light source 202 does not occupy a separate space when viewed from the top surface. Therefore, when connecting the plurality of light guide plates 201 can be installed compactly without a margin, there is an advantage that can be designed so that the connection portion between the light guide plate 201 and the light guide plate 201 is not visible. In this manner, in the edge light type backlight device 200 using the light guide plate 201, the light efficiency of the light guide plate 201 can be increased without installing additional reflectors, and the appearance problem due to the strong light emission around the edges can be eliminated. Can be.
한편, 도 4는 본 발명의 제3 실시예에 따른 백라이트 장치의 측단면도이며, 도 5는 본 발명의 도 4의 백라이트 장치의 평면도이다.4 is a side cross-sectional view of a backlight device according to a third embodiment of the present invention, and FIG. 5 is a plan view of the backlight device of FIG. 4 of the present invention.
도　4 및 도 5를 참조하면, 백라이트 장치(200)에는 나란히 배열된 다수개의 도광판(201)이 마련되어 있다. 도광판(201)의 적어도 일면에는 도광패턴(201a)이 형성되어 있다. 다수개의 도광판(201) 측면에는 하나 이상의 광원(202)이 배치되어 있고, 광원(202)이 배치되어 있지 않은 도광판(201)의 측면에는 적어도 하나 이상의 경사면(203)이 형성되어 있다. 도광판(201)의 하부 면에는 도광판(201) 하부 면으로 나온 빛을 상부로 반사시킬 수 있는 반사재(204)가 설치되어 있으며, 도광판(201)의 상부에는 빛을 산란 및 확산시키는 확산재(205)가 설치되어 있다.4 and 5, the backlight device 200 is provided with a plurality of light guide plates 201 arranged side by side. The light guide pattern 201a is formed on at least one surface of the light guide plate 201. One or more light sources 202 are disposed on the side surfaces of the plurality of light guide plates 201, and at least one inclined surface 203 is formed on the side surfaces of the light guide plates 201 where the light sources 202 are not disposed. The lower surface of the light guide plate 201 is provided with a reflector 204 for reflecting light emitted from the lower surface of the light guide plate 201 to the upper portion, and a diffusion material 205 for scattering and diffusing light on the upper portion of the light guide plate 201. ) Is installed.
도광판(201)의 측면에 설치된 하나 이상의 광원(202)에서 나온 빛은 도광판(201) 내부로 입사되고, 도광판(201) 내부로 입사된 빛은 전반사 효과에 의해 도광판(201) 내부를 도광하여 진행한다. 도광판(201) 내부로 진행된 빛 중에서 일부는 도광패턴(201a)에 의해 굴절되거나 산란되어 도광판(201) 상면으로 출사되고, 일부 도광패턴(201a)에서 출사된 빛은 반사재(204)를 거쳐 반사되고 다시 도광판(201)을 통과한 후 도광판(201) 상면의 확산재(205)를 통과하여 전면으로 출사되는 원리를 가진다. 이 때, 도광패턴(201a)은 각각의 도광판(201) 구획 내에서 광원(202)에서 멀리 떨어진 부위는 밀도가 높게, 상대적으로 광원(202)에서 가까운 부위는 밀도가 낮게 형성되어 균일한 면광원을 얻을 수 있다.Light from one or more light sources 202 installed on the side of the light guide plate 201 is incident into the light guide plate 201, and the light incident into the light guide plate 201 proceeds by guiding the inside of the light guide plate 201 by the total reflection effect. do. Some of the light propagated into the light guide plate 201 is refracted or scattered by the light guide pattern 201a and emitted to the upper surface of the light guide plate 201, and the light emitted from the light guide pattern 201a is reflected through the reflector 204. After passing through the light guide plate 201 again, the light guide plate 201 passes through the diffusion material 205 on the upper surface of the light guide plate 201 and has a principle of exiting to the front surface. At this time, the light guide pattern 201a has a high density at the portion far away from the light source 202 in each of the light guide plates 201, and has a low density at a portion relatively close to the light source 202 so as to provide a uniform surface light source. Can be obtained.
또한, 하나 이상의 광원(202)을 적절하게 차등하여 디밍함으로써 각 구획의 밝기를 다른 구획과 차등되게 조절할 수 있다. 이 때, 광원(202)은 다수개의 LED의 조합으로 이루어지며 하나의 기판에 여러개의 광원(202)을 설치하여 사용할 수도 있다. 실시예에 따라서는 도광패턴(201a)은 경사면(203)에도 위치할 수 있다.In addition, by dimming the one or more light sources 202 appropriately, the brightness of each compartment can be adjusted to be different from the other compartment. At this time, the light source 202 is made of a combination of a plurality of LEDs and may be used by installing a plurality of light sources 202 on one substrate. In some embodiments, the light guide pattern 201a may be positioned on the inclined surface 203.
한편, 경사면(203)에 입사되는 빛은 경사면(203)의 기울기에 의해 도광판(201)의 하면으로 전반사되고 하면으로 반사된 빛은 다시 도광판(201) 내부를 이동하거나 도광판(201) 하면에 설치된 반사재(204)에 의해 도광판(201) 상면으로 출사된다. 이 때 경사면(203)에서 전반사 조건을 충족하지 못한 일부 빛은 경사면(203) 외부로 출사되어 전면에서 면광원을 바라 보았을 때 경사면(203)에서 암부가 생기지 않게 된다. 한편, 경사면(203)은 레이저 가공, NC 가공, 사출 성형, 압출 성형 등 여러 가지 공법에 의해 가공할 수 있다.On the other hand, the light incident on the inclined surface 203 is totally reflected to the lower surface of the light guide plate 201 by the inclination of the inclined surface 203 and the light reflected to the lower surface again moves inside the light guide plate 201 or installed on the lower surface of the light guide plate 201. The reflecting material 204 is emitted to the upper surface of the light guide plate 201. At this time, some of the light that does not meet the total reflection condition on the inclined surface 203 is emitted to the outside of the inclined surface 203 when the front surface light source is viewed from the front so that the dark portion does not occur on the inclined surface 203. On the other hand, the inclined surface 203 can be processed by various methods such as laser processing, NC processing, injection molding, extrusion molding.
한편, 도 6은 본 발명의 제1 실시예 내지 제3 실시예의 경사면의 다양한 형상을 도시한 측단면이다.6 is a side sectional view showing various shapes of the inclined surfaces of the first to third embodiments of the present invention.
도 6을 참조하면, 모서리의 각도(θ)는 90도를 초과하는 둔각으로, 135도 전후가 바람직하다. 경사면(203)의 형상은 (a)에 도시된 바와 같은 직선 형상이거나, (b)에 도시된 바와 같은 전체가 소정의 곡률을 가진 원호 형상이거나, (c)에 도시된 바와 같이 상단부분만 소정의 곡률을 가지고, 하단 부분은 직선인 조합 형상으로도 가공될 수 있다. 도 6의 경사면의 형상들은 일 실시예에 불과할 뿐, 당업자의 필요에 따라 곡선 등으로 다양하게 변형하여 실시될 수 있음은 자명하다.6, the angle θ of the corner is an obtuse angle exceeding 90 degrees, preferably around 135 degrees. The shape of the inclined surface 203 may be a straight line shape as shown in (a), an arc shape having a predetermined curvature as a whole as shown in (b), or a predetermined upper portion as shown in (c). With a curvature of, the lower part can also be machined into a combination shape that is straight. Shapes of the inclined surface of Figure 6 is only one embodiment, it is apparent that it can be implemented by various modifications, such as curves, according to the needs of those skilled in the art.
본 발명은 도면에 도시된 일 실시예를 참고로 설명되었으나 이는 예시적인 것에 불과하며, 본 기술 분야의 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 것이다. 따라서, 본 발명의 진정한 기술적 보호범위는 첨부된 등록청구범위의 기술적 사상에 의해 정해져야 할 것이다.Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (11)

  1. 광원과, 광원에서 나온 빛을 균일하게 도광시키는 도광판과, 도광판의 적어도 일면에 설치되는 도광패턴과, 도광판의 하부에 설치되는 반사재와, 도광판의 상부에 설치되는 확산재를 포함하는 백라이트 장치에 있어서,In a backlight device comprising a light source, a light guide plate for uniformly guiding light emitted from the light source, a light guide pattern provided on at least one surface of the light guide plate, a reflector provided on the lower part of the light guide plate, and a diffusion material provided on the light guide plate. ,
    상기 도광판에는 적어도 하나 이상의 경사면이 형성되고,At least one inclined surface is formed on the light guide plate,
    상기 도광판에 형성되는 경사면의 상부 모서리의 각도를 둔각으로 함으로써, 도광판의 에지부에 야기되는 강한 발광을 최소화하는 것을 특징으로 하는 백라이트 장치.The angle of the upper edge of the inclined surface formed in the light guide plate to an obtuse angle, to minimize the strong light emission caused by the edge portion of the light guide plate.
  2. 제1항에 있어서,The method of claim 1,
    상기 도광판에 형성되는 경사면의 형상은, 직선 또는 곡선 형상을 가지는 것을 특징으로 하는 백라이트 장치.The shape of the inclined surface formed on the light guide plate has a straight or curved shape.
  3. 제1항에 있어서,The method of claim 1,
    상기 도광판에 형성되는 경사면은, NC 가공, 사출, 압출, 레이저 가공의 방법에 의해 형성된 것을 특징으로 하는 백라이트 장치.The inclined surface formed in the said light guide plate is formed by the method of NC processing, injection, extrusion, and laser processing.
  4. 제1항에 있어서,The method of claim 1,
    상기 도광판의 상면과 하면 모두에 상기 도광패턴이 형성된 것을 특징으로 하는 백라이트 장치.And a light guide pattern formed on both the top and bottom surfaces of the light guide plate.
  5. 제1항에 있어서,The method of claim 1,
    상기 경사면에도 상기 도광패턴이 형성된 것을 특징으로 하는 백라이트 장치.And the light guide pattern is formed on the inclined surface.
  6. 제1항에 있어서,The method of claim 1,
    상기 광원이 상기 도광판의 하면에 설치된 것을 특징으로 하는 백라이트 장치.And the light source is installed on a lower surface of the light guide plate.
  7. 하나 이상의 광원과, 광원에서 나온 빛을 균일하게 도광시키는 하나 이상의 도광판과, 도광판의 적어도 일면에 설치되는 도광패턴과, 하나 이상의 도광판의 하부에 설치되는 반사재와, 하나 이상의 도광판의 상부에 설치되는 확산재를 포함하는 백라이트 장치에 있어서,At least one light source, at least one light guide plate for uniformly guiding light from the light source, a light guide pattern provided on at least one surface of the light guide plate, a reflector provided at the bottom of the at least one light guide plate, and a diffusion provided at the top of the at least one light guide plate A backlight device comprising ash,
    상기 하나 이상의 도광판 각각에 하나 이상의 경사면이 형성되고,At least one inclined surface is formed on each of the at least one light guide plate,
    상기 경사면의 상부 모서리가 둔각으로 이루어지고,The upper edge of the inclined surface is an obtuse angle,
    상기 하나 이상의 광원을 소정의 영역에서 구획되어 발광하도록 구동함으로써 로컬 디밍 효과를 구현하는 것을 특징으로 하는 백라이트 장치.And driving the one or more light sources to partition and emit light in a predetermined area to implement a local dimming effect.
  8. 제7항에 있어서,The method of claim 7, wherein
    상기 도광판에 형성되는 경사면의 형상은, 직선 또는 곡선 형상을 가지는 것을 특징으로 하는 백라이트 장치.The shape of the inclined surface formed on the light guide plate has a straight or curved shape.
  9. 제7항에 있어서,The method of claim 7, wherein
    상기 도광판에 형성되는 경사면은, NC 가공, 사출, 압출, 레이저 가공의 방법에 의해 형성된 것을 특징으로 하는 백라이트 장치.The inclined surface formed in the said light guide plate is formed by the method of NC processing, injection, extrusion, and laser processing.
  10. 제7항에 있어서,The method of claim 7, wherein
    상기 도광판의 상면과 하면 모두에 상기 도광패턴이 형성된 것을 특징으로 하는 백라이트 장치.And a light guide pattern formed on both the top and bottom surfaces of the light guide plate.
  11. 제7항에 있어서,The method of claim 7, wherein
    상기 경사면에도 상기 도광패턴이 형성된 것을 특징으로 하는 백라이트 장치.And the light guide pattern is formed on the inclined surface.
PCT/KR2009/004666 2009-08-21 2009-08-21 Backlight device WO2011021738A1 (en)

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