KR20090069235A - Surface light source device - Google Patents

Surface light source device Download PDF

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KR20090069235A
KR20090069235A KR1020080132393A KR20080132393A KR20090069235A KR 20090069235 A KR20090069235 A KR 20090069235A KR 1020080132393 A KR1020080132393 A KR 1020080132393A KR 20080132393 A KR20080132393 A KR 20080132393A KR 20090069235 A KR20090069235 A KR 20090069235A
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light
light source
led
source device
surface light
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KR1020080132393A
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Korean (ko)
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다케시 가와카미
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스미또모 가가꾸 가부시끼가이샤
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Publication of KR20090069235A publication Critical patent/KR20090069235A/en

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    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133621—Illuminating devices providing coloured light

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Led Device Packages (AREA)

Abstract

A surface light source device is provided to emit white light in which lights of three primary colors are sufficiently mixed from LEDs. A surface light source device(3) comprises a light diffusing plate(1) and an LED(Light Emitting Device) light source(2) arranged on a rear side of the light diffusion plate. The total light transmission rate of the light diffusion plate is between 50% and 67%. A thickness of the light diffusion plate is 2.5mm or greater.

Description

면광원 장치{SURFACE LIGHT SOURCE DEVICE}Surface light source device {SURFACE LIGHT SOURCE DEVICE}

본 발명은 면광원 장치에 관한 것으로, 상세하게는 광원으로서 LED (발광 다이오드) 를 사용한 면광원 장치에 관한 것이다. The present invention relates to a surface light source device, and more particularly, to a surface light source device using an LED (light emitting diode) as a light source.

액정 텔레비전 등에 삽입되어 사용되는 면광원 장치 (3) 로는, 도 1 에 나타내는 바와 같이, 광 확산판 (1) 과, 그 배면측에 배치된 광원 (2) 을 구비한 것이 일반적으로 사용되고 있으며, 광 확산판 (1) 으로는 무색이면서, 박형화의 관점에서 두께가 기껏해야 2㎜ 인 것이, 또 광원 (2) 으로는 냉음극 형광관이 사용되고 있으며, 최근에는 에너지 절약의 관점에서 광원 (2) 으로서 LED (발광 다이오드) 를 사용한 것도 제안되어 있다〔「액정 디스플레이용 백라이트 기술-액정 조명 시스템과 부재료-」, CMC 출판, 2006년 8월 31일 발행, p.148-149〕.As the surface light source device 3 inserted and used for a liquid crystal television etc., as shown in FIG. 1, the thing provided with the light-diffusion plate 1 and the light source 2 arrange | positioned at the back side is generally used, The diffuser plate 1 is colorless and has a thickness of at most 2 mm from the viewpoint of thinning, and a cold cathode fluorescent tube is used as the light source 2. In recent years, as the light source 2 from the viewpoint of energy saving, The use of LEDs (light emitting diodes) has also been proposed (“Backlit Technology for Liquid Crystal Displays—Liquid Crystal Lighting Systems and Subsidiary Materials”, CMC Publications, August 31, 2006, p. 148-149).

광원으로서 LED 를 사용하는 경우, 광의 3 원색에 대응하는 적색 LED, 녹색 LED 및 청색 LED 를 나열하여 사용되고 있으며, 이들 각 LED 로부터의 광은 광 확산판을 투과하는 동안에 혼색되어 백색광이 되어, 면광원 장치 (3) 의 전면측으로 출사된다.In the case of using an LED as a light source, a red LED, a green LED, and a blue LED corresponding to three primary colors of light are used in order, and the light from each of these LEDs is mixed and becomes white light while passing through the light diffuser plate, and is a surface light source. It is emitted to the front side of the apparatus 3.

그러나, 종래의 광 확산판을 사용한 면광원 장치에서는 3 원색의 광의 혼색이 불충분하였다.However, in the surface light source device using the conventional light diffusion plate, the mixed color of the light of three primary colors is insufficient.

그래서, 본 발명자는 LED 를 광원으로서 사용하여 광의 3 원색이 충분히 혼색된 백색광을 출사시킬 수 있는 면광원 장치를 개발하기 위해 예의 검토한 결과, 본 발명에 이르렀다. Accordingly, the present inventors have made a thorough investigation to develop a surface light source device capable of emitting white light in which three primary colors of light are sufficiently mixed using LEDs as a light source.

즉, 본 발명은 광 확산판 (1) 과, 그 광 확산판 (1) 의 배면측에 배치된 LED 광원 (2) 을 구비하고, 상기 광 확산판 (1) 은 전체 광선 투과율 (Tt) 이 50% ∼ 67% 이고, 두께가 2.5㎜ 이상인 것을 특징으로 하는 면광원 장치 (3) 를 제공하는 것이다. That is, this invention is equipped with the light-diffusion plate 1 and the LED light source 2 arrange | positioned at the back side of the light-diffusion plate 1, The said light-diffusion plate 1 has a total light transmittance Tt. It is 50%-67%, and thickness provides 2.5 mm or more, The surface light source device 3 is provided.

본 발명의 면광원 장치에 의하면, LED 로부터의 3 원색의 광이 충분히 혼색된 백색광이 되어 출사된다.According to the surface light source device of this invention, the light of three primary colors from LED turns into white light mixed enough.

본 발명의 면광원 장치 (3) 에 사용되는 광 확산판 (1) 으로는 통상적으로 착색이 없는 무색 (백색) 인 것이 사용되고, 그 크기는 목적으로 하는 백라이트 장치나 직하형 액정 디스플레이 장치에 따라 적절히 선택되는데, 20 형 (세로 30㎝, 가로 40㎝) 이상의 비교적 큰 면적에 적합하다.As the light diffusion plate 1 used for the surface light source device 3 of the present invention, a colorless (white) colorant without coloration is usually used, and the size thereof is appropriately selected depending on the desired backlight device or direct type liquid crystal display device. It is selected, suitable for a relatively large area of 20 type (30 cm long, 40 cm wide) or more.

광 확산판 (1) 의 두께는 2.5㎜ 이상이고, 통상은 5㎜ 이하이다. 두께가 2.5㎜ 미만에서는 3 원색의 광의 혼색이 불충분해지고, 5㎜ 를 초과하면 이것에 상응한 효과가 얻어지지 않아, 박형화의 관점에서 불리하다. The thickness of the light diffusion plate 1 is 2.5 mm or more, and usually 5 mm or less. If the thickness is less than 2.5 mm, the mixed color of the light of three primary colors becomes insufficient, and if it exceeds 5 mm, the effect corresponding to this is not obtained, and it is disadvantageous from the viewpoint of thickness reduction.

이러한 광 확산판은, 예를 들어 투명 수지와 확산제를 용융 혼련한 후, 압출 성형하는 압출 성형법, 사출 성형하는 사출 성형법, 열 프레스하는 열 프레스법 등의 통상의 성형 방법에 의해 성형함으로써 제조한다.Such a light diffusing plate is produced by melt-kneading a transparent resin and a diffusing agent, and then forming the light diffusing plate by conventional molding methods such as extrusion molding for extrusion molding, injection molding for injection molding, and hot pressing for hot pressing. .

투명 수지로는, 예를 들어 폴리카보네이트 수지, ABS 수지 (아크릴로니트릴-스티렌-부타디엔 공중합체 수지), 메타크릴 수지, MS 수지 (메타크릴산메틸-스티렌 공중합체 수지), 폴리스티렌 수지, AS 수지 (아크릴로니트릴-스티렌 공중합체 수지), 폴리에틸렌, 폴리프로필렌 등의 폴리올레핀 수지 등을 들 수 있다.As transparent resin, polycarbonate resin, ABS resin (acrylonitrile-styrene-butadiene copolymer resin), methacryl resin, MS resin (methyl methacrylate-styrene copolymer resin), polystyrene resin, AS resin, for example (Acrylonitrile-styrene copolymer resin), polyolefin resin, such as polyethylene and a polypropylene, etc. are mentioned.

확산제로는 광 확산판을 구성하는 투광성 수지와 굴절률이 상이한 입자로서 투과광을 확산시킬 수 있는 것이라면 특별히 한정되지 않으며, 예를 들어 무기 유리 입자, 유리 파이버, 실리카 입자, 수산화알루미늄 입자, 탄산칼슘 입자, 황산바륨 입자, 산화티탄 입자, 탤크 등의 무기 입자이어도 되고, 스티렌계 중합체 입자, 아크릴계 중합체 입자, 실록산계 중합체 입자 등의 유기 입자이어도 된다. The diffusing agent is not particularly limited as long as it can diffuse the transmitted light as a particle having a different refractive index from the light-transmitting resin constituting the light diffusing plate. For example, inorganic glass particles, glass fibers, silica particles, aluminum hydroxide particles, calcium carbonate particles, Inorganic particles such as barium sulfate particles, titanium oxide particles, and talc may be used, or organic particles such as styrene polymer particles, acrylic polymer particles, and siloxane polymer particles may be used.

광 확산제의 입자경은 중량 평균 입자경으로 통상적으로 0.8㎛ 이상, 10㎛ 이하, 바람직하게는 2 ∼ 3㎛ 이다. The particle diameter of the light diffusing agent is usually 0.8 µm or more and 10 µm or less, preferably 2 to 3 µm in terms of weight average particle diameter.

광 확산판의 전체 광선 투과율 (Tt) 은 50% ∼ 67% 이다. 50% 미만에서는 휘도가 불충분해지고, 67% 를 초과하면 LED 로부터의 광의 혼색이 불충분해진다. 전체 광선 투과율 (Tt) 은 예를 들어 첨가하는 광 확산제의 첨가량이 많아 질수록 작아진다. 전체 광선 투과율 (Tt) 은 JIS K7361-1 (1997년) 에 준거하여 측정된다. The total light transmittance Tt of the light diffusion plate is 50% to 67%. If it is less than 50%, the luminance becomes insufficient, and if it exceeds 67%, the color mixture of light from the LED becomes insufficient. The total light transmittance (Tt) decreases as the amount of the light diffusing agent added increases, for example. Total light transmittance Tt is measured based on JISK7361-1 (1997).

광원 (2) 은 LED 이다. LED 로는 발광 다이오드 칩이 에폭시 수지제 렌즈로 덮여 있는 구조인 것이 사용되고, 그 지향성 패턴은 램버시안 타입 (Lambertian Type), 배트윙 타입, 사이드 에미터 타입 중 어느 것이어도 되지만, 바람직하게는 램버시안 타입이다.The light source 2 is an LED. As the LED, a structure in which the light emitting diode chip is covered with an epoxy resin lens is used, and the directional pattern may be any of Lambertian type, batwing type, and side emitter type, but is preferably Lambertian type. to be.

실시예Example

이하, 실시예에 의해 본 발명에 대하여 보다 상세하게 설명한다. Hereinafter, the present invention will be described in more detail with reference to Examples.

실시예 1 Example 1

도 1 에 나타내는 바와 같은 광 확산판 (1) 과, 그 배면측에 배치된 LED (2) 를 구비한 면광원 장치 (3) 를 사용하였다. 광 확산판 (1) 으로는 폴리스티렌 수지〔토요 스티렌사 제조, 「토요 스티롤 HRM40」, 굴절률 1.59〕100 질량부에 광 확산제〔아크릴계 가교 수지 입자, 세키스이 카세이힌 공업사 제조의 「MBX-2H」, 중량 평균 입자경 3㎛, 굴절률 1.49〕2 질량부를 첨가하여 혼합한 후, 압출기〔스크루 직경 40㎜〕로 210℃ ∼ 250℃ 에서 용융 혼련하고, 피드 블록을 경유하여 245℃ ∼ 255℃ 의 T 다이로부터 판상으로 압출하여 조제한 것을 사용하였다. 사용한 광 확산판 (1) 의 전체 광선 투과율 (Tt) 은 55% 이고, 두께는 3㎜ 이었다. LED (2) 로는 적색 LED 1 개를 사용하였다. 이 LED (2) 를 점등시켜 광 확산판 (1) 을 투과하는 투과광의 휘도 프로파일을 측정한 결과, 도 2 에 나타내는 바와 같았다. 도 2 에 나타내는 휘도 프로파일에 있어서, 횡축은 LED (2) 바로 위를 원점으로 한 측정 위치까지의 거리 (Distance) 를, 종축은 측정 위치에 있어서의 휘도 (Luminance) 를 각각 나타낸다. 이 면광원 장치 (3) 는 LED (2) 바로 위의 위치에서부터 20㎜ 떨어진 위치에서도 충분한 휘도를 나타내는 바와 같이 LED 로부터의 광이 충분히 확산되고 있기 때문에, 광의 3 원색에 대응하는 적색 LED, 녹색 LED 및 청색 LED 를 광원 (3) 으로서 사용한 경우에는, 이들 LED 로부터의 광을 충분히 혼색하여 백색광으로 할 수 있다. The surface light source device 3 provided with the light-diffusion plate 1 and the LED 2 arrange | positioned at the back side was used as shown in FIG. As the light diffusion plate 1, 100 parts by weight of a polystyrene resin (Toyo Styrene Co., Ltd., "Toyo Styrol HRM40", refractive index 1.59] is 100 parts by mass of a light diffusing agent [acrylic crosslinked resin particles, Sekisui Kasei Industries Co., Ltd. "MBX-2H" After mixing by adding 2 parts by mass of a weight average particle diameter of 3 µm and a refractive index of 1.49], the mixture was melt kneaded at an extruder (screw diameter of 40 mm) at 210 ° C to 250 ° C and a T die of 245 ° C to 255 ° C via a feed block. What was prepared by extruding into plate shape from the was used. The total light transmittance Tt of the used light diffusing plate 1 was 55%, and the thickness was 3 mm. As the LED 2, one red LED was used. As a result of measuring the luminance profile of the transmitted light passing through the light diffusion plate 1 by lighting the LED 2, the result was as shown in FIG. 2. In the luminance profile shown in FIG. 2, the horizontal axis represents the distance to the measurement position with the origin just above the LED 2, and the vertical axis represents the luminance at the measurement position, respectively. Since the surface light source device 3 sufficiently diffuses the light from the LED as showing sufficient luminance even at a position 20 mm away from the position directly above the LED 2, the red LED and the green LED corresponding to the three primary colors of the light. And when blue LED is used as the light source 3, the light from these LEDs can fully be mixed and it can be set as white light.

실시예 2 Example 2

광 확산제의 사용량을 0.89 질량부로 하고, 실시예 1 과 동일하게 하여 전체 광선 투과율 (Tt) 이 55% 이고 두께가 4㎜ 인 광 확산판 (1) 을 제조하였다. 그리고, 그것을 사용한 것 이외에는 실시예 1 과 동일한 면광원 장치 (3) 를 제조하였다. 이 면광원 장치의 휘도 프로파일을 도 2 에 나타낸다. 이 면광원 장치 (3) 는 LED (2) 바로 위의 위치에서부터 20㎜ 떨어진 위치에서도 충분한 휘도를 나타내는 바와 같이 LED 로부터의 광이 충분히 확산되고 있기 때문에, 적색 LED, 녹색 LED 및 청색 LED 를 광원 (3) 으로서 사용한 경우에는, 이들 LED 로부터의 광을 충분히 혼색하여 백색광으로 할 수 있다. The light diffusing plate 1 having a total light transmittance Tt of 55% and a thickness of 4 mm was prepared in the same manner as in Example 1, with the amount of the light diffusing agent used at 0.89 parts by mass. And the surface light source device 3 similar to Example 1 was manufactured except having used it. The luminance profile of this surface light source device is shown in FIG. Since the surface light source device 3 sufficiently diffuses the light from the LED as showing sufficient luminance even at a position 20 mm away from the position immediately above the LED 2, the red light source, the green light source, and the blue light source (LED) are used as the light source ( When used as 3), the light from these LEDs can be sufficiently mixed into white light.

비교예 1 Comparative Example 1

광 확산제의 사용량을 10 질량부로 하고, 실시예 1 과 동일하게 하여 전체 광선 투과율 (Tt) 이 55% 이고 두께가 1.5㎜ 인 광 확산판 (1) 을 제조하였다. 그리고, 그것을 사용한 것 이외에는 실시예 1 과 동일한 면광원 장치 (3) 를 제조하였다. 이 면광원 장치의 휘도 프로파일을 도 2 에 나타낸다. 이 면광원 장치는 LED (2) 바로 위의 위치에서부터 20㎜ 떨어진 위치에서의 휘도가 낮기 때문에 LED 로부터의 광의 확산이 불충분하여, 적색 LED, 녹색 LED 및 청색 LED 를 광원으로서 사용한 경우에는, 이들 LED 로부터의 광의 혼색이 불충분해져 완전한 백색광으로는 되지 않는다.The light diffusing plate 1 having a total light transmittance Tt of 55% and a thickness of 1.5 mm was prepared in the same manner as in Example 1, with the amount of the light diffusing agent being 10 parts by mass. And the surface light source device 3 similar to Example 1 was manufactured except having used it. The luminance profile of this surface light source device is shown in FIG. Since the surface light source device has low luminance at a position 20 mm away from the position directly above the LED 2, light diffusion from the LED is insufficient, and these LEDs are used when a red LED, a green LED, and a blue LED are used as the light source. The color mixture of light from the color is insufficient, resulting in no complete white light.

비교예 2 Comparative Example 2

광 확산제의 사용량을 4.1 질량부로 하고, 실시예 1 과 동일하게 하여 전체 광선 투과율 (Tt) 이 55% 이고 두께가 2㎜ 인 광 확산판 (1) 을 제조하였다. 그리고, 그것을 사용한 것 이외에는 실시예 1 과 동일한 면광원 장치를 제조하였다. 이 면광원 장치의 휘도 프로파일을 도 2 에 나타낸다. 이 면광원 장치는 LED (2) 바로 위의 위치에서부터 20㎜ 떨어진 위치에서의 휘도가 낮기 때문에 LED 로부터의 광의 확산이 불충분하여 적색 LED, 녹색 LED 및 청색 LED 를 광원으로서 사용한 경우에는, 이들 LED 로부터의 광의 혼색이 불충분해져 완전한 백색광으로는 되지 않는다. The light diffusing plate 1 having a total light transmittance Tt of 55% and a thickness of 2 mm was produced in the same manner as in Example 1, with the amount of the light diffusing agent used at 4.1 parts by mass. And the same surface light source device as Example 1 was manufactured except having used it. The luminance profile of this surface light source device is shown in FIG. Since the surface light source device has a low luminance at a position 20 mm away from the position directly above the LED 2, light diffusion from the LED is insufficient, and when a red LED, a green LED, and a blue LED are used as a light source, these LEDs are separated from these LEDs. The color mixture of the light is insufficient and does not become a perfect white light.

실시예 3 및 실시예 4 Example 3 and Example 4

광 확산제의 사용량을 1.3 질량부〔실시예 3〕및 0.7 질량부〔실시예 4〕로 하고, 실시예 1 과 동일하게 하여 전체 광선 투과율 (Tt) 이 60% 이고 두께가 3㎜ 인 광 확산판〔실시예 3〕, 및 전체 광선 투과율 (Tt) 이 60% 이고 두께가 4㎜ 인 광 확산판〔실시예 4〕을 각각 제조하였다. 그리고, 그것들을 사용한 것 이외에는 실시예 1 과 동일한 면광원 장치 (3) 를 제조하였다. 이 면광원 장치의 휘도 프로파일을 도 3 에 나타낸다. 이 면광원 장치 (3) 는 LED (2) 바로 위의 위치에서부터 20㎜ 떨어진 위치에서도 충분한 휘도를 나타내는 바와 같이 LED 로부터의 광이 충분히 확산되고 있기 때문에, 적색 LED, 녹색 LED 및 청색 LED 를 광원 (3) 으로서 사용한 경우에는, 이들 LED 로부터의 광을 충분히 혼색하여 백색광으로 할 수 있다. The amount of the light diffusing agent used was 1.3 parts by mass [Example 3] and 0.7 parts by mass [Example 4], and the same as in Example 1, and the light diffusion with a total light transmittance (Tt) of 60% and a thickness of 3 mm was made. A plate [Example 3] and a light diffusion plate [Example 4] each having a total light transmittance (Tt) of 60% and a thickness of 4 mm were prepared. And the surface light source device 3 similar to Example 1 was manufactured except having used them. The luminance profile of this surface light source device is shown in FIG. Since the surface light source device 3 sufficiently diffuses the light from the LED as showing sufficient luminance even at a position 20 mm away from the position immediately above the LED 2, the red light source, the green light source, and the blue light source (LED) are used as the light source ( When used as 3), the light from these LEDs can be sufficiently mixed into white light.

비교예 3 및 비교예 4 Comparative Example 3 and Comparative Example 4

광 확산제의 사용량을 4.5 질량부〔비교예 3〕및 2.4 질량부〔비교예 4〕로 하고, 실시예 1 과 동일하게 하여 전체 광선 투과율 (Tt) 이 60% 이고 두께가 1.5㎜ 인 광 확산판〔비교예 3〕, 및 전체 광선 투과율 (Tt) 이 60% 이고 두께가 2㎜ 인 광 확산판〔비교예 4〕을 각각 제조하였다. 그리고, 그것들을 사용한 것 이외에는 실시예 1 과 동일한 면광원 장치 (3) 를 제조하였다. 이 면광원 장치의 휘도 프로파일을 도 3 에 나타낸다. 이 면광원 장치는 LED (2) 바로 위의 위치에서부터 20㎜ 떨어진 위치에서의 휘도가 낮기 때문에 LED 로부터의 광의 확산이 불충분하여, 적색 LED, 녹색 LED 및 청색 LED 를 광원으로서 사용한 경우에는, 이들 LED 로부터의 광의 혼색이 불충분해져 완전한 백색광으로는 되지 않는다. The amount of use of the light diffusing agent was set to 4.5 parts by mass [Comparative Example 3] and 2.4 parts by mass [Comparative Example 4], and was the same as that in Example 1, with a light diffusing agent having a total light transmittance (Tt) of 60% and a thickness of 1.5 mm. [Comparative Example 3] and a light diffusing plate [Comparative Example 4] each having a total light transmittance (Tt) of 60% and a thickness of 2 mm were prepared. And the surface light source device 3 similar to Example 1 was manufactured except having used them. The luminance profile of this surface light source device is shown in FIG. Since the surface light source device has low luminance at a position 20 mm away from the position directly above the LED 2, light diffusion from the LED is insufficient, and these LEDs are used when a red LED, a green LED, and a blue LED are used as the light source. The color mixture of light from the color is insufficient, resulting in no complete white light.

실시예 5 및 실시예 6 Example 5 and Example 6

광 확산제의 사용량을 0.8 질량부〔실시예 5〕및 0.55 질량부〔실시예 6〕로 하고, 실시예 1 과 동일하게 하여 전체 광선 투과율 (Tt) 이 65% 이고 두께가 3㎜ 인 광 확산판〔실시예 5〕, 및 전체 광선 투과율 (Tt) 이 65% 이고 두께가 4㎜ 인 광 확산판〔실시예 6〕을 각각 제조하였다. 그리고, 그것들을 사용한 것 이외에는 실시예 1 과 동일한 면광원 장치 (3) 를 제조하였다. 이 면광원 장치의 휘도 프로파일을 도 4 에 나타낸다. 이 면광원 장치 (3) 는 LED (2) 바로 위의 위치에서부터 20㎜ 떨어진 위치에서도 충분한 휘도를 나타내는 바와 같이 LED 로부터의 광이 충분히 확산되고 있기 때문에, 적색 LED, 녹색 LED 및 청색 LED 를 광원 (3) 으로서 사용한 경우에는, 이들 LED 로부터의 광을 충분히 혼색하여 백색광으로 할 수 있다. The light diffusing agent was used in an amount of 0.8 parts by mass [Example 5] and 0.55 parts by mass [Example 6], and was the same as in Example 1, with a light diffusing agent having a total light transmittance (Tt) of 65% and a thickness of 3 mm. A plate [Example 5] and a light diffusion plate [Example 6] each having a total light transmittance (Tt) of 65% and a thickness of 4 mm were prepared. And the surface light source device 3 similar to Example 1 was manufactured except having used them. The luminance profile of this surface light source device is shown in FIG. Since the surface light source device 3 sufficiently diffuses the light from the LED as showing sufficient luminance even at a position 20 mm away from the position immediately above the LED 2, the red light source, the green light source, and the blue light source (LED) are used as the light source ( When used as 3), the light from these LEDs can be sufficiently mixed into white light.

비교예 5 및 비교예 6 Comparative Example 5 and Comparative Example 6

광 확산제의 사용량을 3 질량부〔비교예 5〕및 2 질량부〔비교예 6〕로 하고, 실시예 1 과 동일하게 하여 전체 광선 투과율 (Tt) 이 65% 이고 두께가 1.5㎜ 인 광 확산판〔비교예 5〕, 및 전체 광선 투과율 (Tt) 이 65% 이고 두께가 2㎜ 인 광 확산판〔비교예 6〕을 각각 제조하였다. 그리고, 그것들을 사용한 것 이외에는 실시예 1 과 동일한 면광원 장치 (3) 를 제조하였다. 이 면광원 장치의 휘도 프로파일을 도 4 에 나타낸다. 이 면광원 장치는 LED (2) 바로 위의 위치에서부터 20㎜ 떨어진 위치에서의 휘도가 낮기 때문에 LED 로부터의 광의 확산이 불충분하여, 적색 LED, 녹색 LED 및 청색 LED 를 광원으로서 사용한 경우에는, 이들 LED 로부터의 광의 혼색이 불충분해져 완전한 백색광으로는 되지 않는다. The amount of the light diffusing agent used was 3 parts by mass [Comparative Example 5] and 2 parts by mass [Comparative Example 6], and the same as in Example 1, the light diffusing agent having a total light transmittance (Tt) of 65% and a thickness of 1.5 mm was used. [Comparative Example 5] and a light diffusing plate [Comparative Example 6] each having a total light transmittance Tt of 65% and a thickness of 2 mm were prepared. And the surface light source device 3 similar to Example 1 was manufactured except having used them. The luminance profile of this surface light source device is shown in FIG. Since the surface light source device has low luminance at a position 20 mm away from the position directly above the LED 2, light diffusion from the LED is insufficient, and these LEDs are used when a red LED, a green LED, and a blue LED are used as the light source. The color mixture of light from the color is insufficient, resulting in no complete white light.

비교예 7 및 비교예 8 Comparative Example 7 and Comparative Example 8

광 확산제의 사용량을 1.08 질량부〔비교예 7〕및 0.53 질량부〔비교예 8〕로 하고, 실시예 1 과 동일하게 하여 전체 광선 투과율 (Tt) 이 70% 이고 두께가 2㎜ 인 광 확산판〔비교예 7〕, 및 전체 광선 투과율 (Tt) 이 70% 이고 두께가 4㎜ 인 광 확산판〔비교예 8〕을 각각 제조하였다. 그리고, 그것들을 사용한 것 이 외에는 실시예 1 과 동일한 면광원 장치 (3) 를 제조하였다. 이 면광원 장치의 휘도 프로파일을 도 5 에 나타낸다. 이 면광원 장치는 LED (2) 바로 위의 위치에서부터 20㎜ 떨어진 위치에서의 휘도가 낮기 때문에 LED 로부터의 광의 확산이 불충분하여, 적색 LED, 녹색 LED 및 청색 LED 를 광원으로서 사용한 경우에는, 이들 LED 로부터의 광의 혼색이 불충분해져 완전한 백색광으로는 되지 않는다. The amount of the light diffusing agent used was 1.08 parts by mass [Comparative Example 7] and 0.53 parts by mass [Comparative Example 8], and the same as in Example 1, the light diffusion having a total light transmittance (Tt) of 70% and a thickness of 2 mm was used. [Comparative Example 7] and a light diffusing plate [Comparative Example 8] each having a total light transmittance (Tt) of 70% and a thickness of 4 mm were prepared. And the surface light source device 3 similar to Example 1 was manufactured except having used them. The luminance profile of this surface light source device is shown in FIG. Since the surface light source device has low luminance at a position 20 mm away from the position directly above the LED 2, light diffusion from the LED is insufficient, and these LEDs are used when a red LED, a green LED, and a blue LED are used as the light source. The color mixture of light from the color is insufficient, resulting in no complete white light.

산업상 이용 가능성Industrial availability

본 발명의 면광원 장치에 의하면, LED 로부터의 3 원색의 광이 충분히 혼색된 백색광이 되어 출사된다. According to the surface light source device of this invention, the light of three primary colors from LED turns into white light mixed enough.

도 1 은, 본 발명의 면광원 장치의 일례를 모식적으로 나타내는 단면도. 1 is a cross-sectional view schematically showing an example of the surface light source device of the present invention.

도 2 는, 실시예 1 ∼ 실시예 2 및 비교예 1 ∼ 비교예 2 에서 얻은 면광원 장치의 휘도 프로파일. 2 is a luminance profile of the surface light source device obtained in Examples 1 to 2 and Comparative Examples 1 to 2. FIG.

도 3 은, 실시예 3 ∼ 실시예 4 및 비교예 3 ∼ 비교예 4 에서 얻은 면광원 장치의 휘도 프로파일. 3 is a luminance profile of the surface light source device obtained in Examples 3 to 4 and Comparative Examples 3 to 4. FIG.

도 4 는, 실시예 5 ∼ 실시예 6 및 비교예 5 ∼ 비교예 6 에서 얻은 면광원 장치의 휘도 프로파일. 4 is a luminance profile of the surface light source device obtained in Examples 5 to 6 and Comparative Examples 5 to 6. FIG.

도 5 는, 비교예 7 ∼ 비교예 8 에서 얻은 면광원 장치의 휘도 프로파일.5 is a luminance profile of the surface light source device obtained in Comparative Examples 7 to 8. FIG.

*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

1 : 광 확산판 1: light diffuser plate

2 : 광원 (LED) 2: light source (LED)

3 : 면광원 장치3: surface light source device

Claims (1)

광 확산판과, 상기 광 확산판의 배면측에 배치된 LED 광원을 구비하고, A light diffuser plate and an LED light source disposed on the back side of the light diffuser plate, 상기 광 확산판은 전체 광선 투과율 (Tt) 이 50% ∼ 67% 이고, 두께가 2.5㎜ 이상인 것을 특징으로 하는 면광원 장치.The light diffusion plate has a total light transmittance (Tt) of 50% to 67% and a thickness of 2.5 mm or more.
KR1020080132393A 2007-12-25 2008-12-23 Surface light source device KR20090069235A (en)

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