KR20030053859A - A light panel assembly - Google Patents

A light panel assembly Download PDF

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Publication number
KR20030053859A
KR20030053859A KR1020010083884A KR20010083884A KR20030053859A KR 20030053859 A KR20030053859 A KR 20030053859A KR 1020010083884 A KR1020010083884 A KR 1020010083884A KR 20010083884 A KR20010083884 A KR 20010083884A KR 20030053859 A KR20030053859 A KR 20030053859A
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KR
South Korea
Prior art keywords
guide plate
light guide
lamp
light
panel assembly
Prior art date
Application number
KR1020010083884A
Other languages
Korean (ko)
Inventor
사종엽
박종렬
Original Assignee
주식회사 테크자인
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Application filed by 주식회사 테크자인 filed Critical 주식회사 테크자인
Priority to KR1020010083884A priority Critical patent/KR20030053859A/en
Publication of KR20030053859A publication Critical patent/KR20030053859A/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means 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
    • G02B6/0051Diffusing sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553Reflecting elements
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133615Edge-illuminating devices, i.e. illuminating from the side
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00Illuminated signs; Luminous advertising
    • G09F13/18Edge-illuminated signs
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F2201/00Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/34Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector

Abstract

PURPOSE: A light panel assembly is provided to prevent a lamp from being damaged by a weight of a light guide plate or a shock, and remove a frame for protecting a lamp in manufacturing a light panel, thereby reducing the costs for manufacturing the frame. CONSTITUTION: A light guide plate(30) has dispersion patterns(31) on a rear surface and a plurality of holes(32) at an outside edge for installing a light panel. A lamp(20) projects light to the light guide plate. The dispersion patterns are formed at a part of the inside of the rear surface. The light guide plate has a groove(10) for containing the lamp outside the dispersion patterns. The diameter of the lamp is smaller than the thickness of the light guide plate.

Description

라이트 판넬 조립체{A LIGHT PANEL ASSEMBLY}Light panel assembly {A LIGHT PANEL ASSEMBLY}

본 발명은 도광판을 이용한 라이트 판넬에 관한 것으로서, 보다 상세하게는 도광판의 배면 내부의 일부에 산란 패턴을 형성하고, 산란 패턴의 외측에 램프 설치용 홈을 형성하여 램프를 설치한 라이트 판넬 조립체에 관한 것이다.The present invention relates to a light panel using a light guide plate, and more particularly, to a light panel assembly in which a scattering pattern is formed in a part of the rear surface of the light guide plate, and a lamp installation groove is formed outside the scattering pattern to install a lamp. .

종래의 백라이트 방식의 도광판은 도1에 도시한 것과 같이, 일반적으로 배면 전체에 걸쳐서 산란 패턴이 형성되어 있고, 도광판 전체가 발광면으로 사용되고 있다. 그리고 도광판 외부의 측면에 광원이 설치되어 있으며, 램프의 광 입사를 소정의 도광판 방향으로 향하게 하기 위하여 램프 주위에 반사판이 설치되어 있다.In the conventional backlight type light guide plate, as shown in FIG. 1, a scattering pattern is generally formed over the entire rear surface, and the entire light guide plate is used as the light emitting surface. A light source is provided on a side of the outside of the light guide plate, and a reflecting plate is provided around the lamp to direct light incident from the lamp in a predetermined light guide plate direction.

그러나 상기와 같은 구성을 갖는 종래의 라이트 판넬은 도광판 측면에 광원이 위치하고 있어서, 취급시 램프가 손상받기 쉽다는 문제점이 있었다. 따라서 램프를 보호하기 위한 별도의 프레임이 항상 필요하였다. 특히, 램프를 보호하기 위한 프레임 구조의 설계가 복잡하였으며, 대형 도광판의 경우에는 램프가 도광판 자체의 무게에 의하여 힘을 받아 부숴지지 않도록 프레임을 견고하게 구성하여야 하는 문제점이 있었다.However, the conventional light panel having the configuration as described above has a problem that the light source is located on the side of the light guide plate, so that the lamp is easily damaged during handling. Therefore, a separate frame was always needed to protect the lamp. In particular, the design of the frame structure for protecting the lamp is complicated, and in the case of a large light guide plate, there is a problem that the frame must be firmly configured so that the lamp is not broken under the weight of the light guide plate itself.

또한 도광판을 광고용 면광원으로 사용하고자 할 경우에, 램프를 보호하기 위한 프레임을 받드시 설치하여야 하므로 프레임을 사용하지 않고서 광고판넬의 제작하고자 할 경우에 있어서는 디자인에 제한이 있었다.In addition, when the light guide plate is to be used as a surface light source for advertising, the frame for protecting the lamp should be installed so that there is a limitation in the design when the advertisement panel is to be manufactured without using the frame.

본 발명은 상기와 같은 문제점을 해결하기 위한 것으로, 별도의 프레임을 구비하지 않고서도 광원을 보호할 수 있는 구조를 갖는 라이트 판넬 조립체를 제공하는 것을 목적으로 한다. 또한 본 발명은 프레임 없이 면광원으로 사용할 수 있어서, 프레임의 설계 및 제작비용을 절감하고, 디자인의 다양성을 제공할 수 있는 라이트 판넬을 제공하는 것을 목적으로 한다.The present invention is to solve the above problems, an object of the present invention is to provide a light panel assembly having a structure that can protect the light source without providing a separate frame. In addition, an object of the present invention is to provide a light panel that can be used as a surface light source without a frame, reducing the design and manufacturing cost of the frame, and can provide a variety of designs.

도1은 종래의 라이트 판넬 도광판의 구성을 나타내는 사시도1 is a perspective view showing the configuration of a conventional light panel light guide plate

도2는 본 발명에 의한 라이트 판넬의 구성을 나타내는 사시도Figure 2 is a perspective view showing the configuration of a light panel according to the present invention

도3은 본 발명에 의한 라이트 판넬의 주요부 단면 형상을 나타내는 단면도Figure 3 is a cross-sectional view showing the main cross-sectional shape of the light panel according to the present invention

<부호의 간단한 설명><Short description of symbols>

10 램프 홈10 lamp home

20 램프20 lamps

30 도광판30 light guide plate

31 도광판 배면의 산란 패턴31 Scattering Pattern on Backside of Light Guide Plate

32 구멍32 holes

40 램프 반사판40 lamp reflector

50 도광판 반사판50 LGP Reflector

본 발명은 상기와 같은 문제점을 해결하기 위한 것으로서, 산란 패턴이 배면에 형성된 도광판과, 상기 도광판에 광을 입사하기 위한 램프를 포함하는 라이트 판넬 조립체에 있어서, 상기 도광판의 배면에 형성된 산란 패턴은 상기 도광판 배면의 내측 일부분에만 형성되어 있고, 상기 도광판은 상기 램프를 수용하기 위한 홈을 상기 도광판의 내부에 형성된 산란 패턴의 외측에 구비하고, 상기 홈에 설치된 상기 램프는 직경이 상기 도광판의 두께보다 작은 것을 특징으로 한다.According to an aspect of the present invention, there is provided a light guide plate including a light guide plate having a scattering pattern formed on a rear surface thereof, and a lamp for injecting light into the light guide plate, wherein the scattering pattern formed on the rear surface of the light guide plate includes: It is formed only in the inner part of the light guide plate back, the light guide plate has a groove for accommodating the lamp on the outside of the scattering pattern formed in the light guide plate, the lamp provided in the groove is smaller than the thickness of the light guide plate It is characterized by.

또한, 본 발명에 의한 라이트 판넬 조립체는, 상기 도광판의 전면에 설치된 투명 또는 반투명 소재의 보호판 더 포함하는 것을 특징으로 한다.In addition, the light panel assembly according to the invention is characterized in that it further comprises a protective plate of transparent or translucent material provided on the front of the light guide plate.

또한, 본 발명에 의한 라이트 판넬 조립체는, 도광판 배면에 설치된 반사판을 더 포함하는 것을 특징으로 한다.In addition, the light panel assembly according to the invention is characterized in that it further comprises a reflecting plate provided on the back of the light guide plate.

이하에서는 도면을 참조하면서 본 발명에 의한 실시예를 설명한다.Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.

도1은 종래의 라이트 판넬 도광판의 구성을 나타내는 사시도이다. 종래의 라이트 판넬은 도시된 바와 같이 도광판(30) 배면 전면에 산란 패턴(31)이 형성되고, 도광판(30)의 측면에 램프(20)가 설치되어 있다. 따라서 도시되지는 않았으나, 라이트 판넬로 이용하고자 할 경우에 램프를 보호하기 위한 프레임이 반드시 필요하게 된다.1 is a perspective view showing the configuration of a conventional light panel light guide plate. In the conventional light panel, as shown, the scattering pattern 31 is formed on the front surface of the light guide plate 30, and the lamp 20 is provided on the side surface of the light guide plate 30. Therefore, although not shown, a frame for protecting the lamp is necessarily required when using the light panel.

도2는 본 발명에 의한 라이트 판넬의 구성을 나타내는 사시도이다. 본 발명에 의한 라이트 판넬 조립체는 도광판(30)과, 도광판의 배면 내측의 일부에 형성된 산란패턴(31)과, 상기 산란패턴(31)의 외측에 설치된 도광판에 형성된 램프 홈(10)으로 구성된다.2 is a perspective view showing the configuration of a light panel according to the present invention. The light panel assembly according to the present invention includes a light guide plate 30, a scattering pattern 31 formed on a part of the rear surface of the light guide plate, and a lamp groove 10 formed in the light guide plate provided outside the scattering pattern 31. .

도광판의 두께는 램프의 직경보다 두껍게 되어 있다. 도시하지 않은 램프(20)를 지지하기 위한 별도의 홀더를 사용하여 램프(20)를 설치할 경우에는 홀더를 포함한 두께보다 도광판(30)의 두께를 두껍게 한다.The light guide plate is thicker than the diameter of the lamp. When installing the lamp 20 using a separate holder for supporting the lamp 20 not shown, the thickness of the light guide plate 30 is thicker than the thickness including the holder.

도시된 바와 같이 도광판의 외측 테두리 부분에는 산란 패턴(31)을 형성하지 않고, 라이트 판넬을 벽이나 기타 위치에 설치하기 위한 복수의 구멍(32)을 구비하고 있다. 상기 구멍(32)을 이용하여, 도시하지는 않았으나 투명의 보호판을 설치하고, 도광판과 투명 보호판 사이에, 또는 보호판 전면에 광고문구나 이미지가 인쇄된 반투명 필름을 끼워서 전시를 할 수 있다.As illustrated, the outer edge portion of the light guide plate is provided with a plurality of holes 32 for installing the light panel on a wall or other position without forming the scattering pattern 31. Using the hole 32, although not shown, a transparent protective plate may be installed, and a translucent film printed with advertisement text or an image may be inserted between the light guide plate and the transparent protective plate, or in front of the protective plate.

상기의 보호판의 전면에 램프를 가리기 위하여 불투명의 띠 테이프등으로 마감 처리할 수 있다.It may be finished with an opaque band tape or the like to cover the lamp in front of the protective plate.

도광판의 배면에 도광판 반사판(50)을 설치할 수도 있으며, 도시하지는 않았으나 반사판 후면에 투명이나 반투명 혹은 불투명의 보호판을 추가로 설치할 수도 있다. 도광판 반사판(50)은 산란 패턴(31)이 형성된 도광판(30) 배면 부위에만 설치하거나 도광판(30) 전면에 설치하고 램프 홈(10)에 대응하는 부분을 제거할 수 있다. 후면 보호판을 설치할 경우, 보호판에 광원으로 전선을 연결하기 위한 구멍을 처리를 위하여 구멍을 형성하여야 하며, 이 경우 구멍의 위치는 도광판의 램프 홈 하부에 형성한다. 또한 전선이 눌리지 않고 후면으로 빠져나갈 수 있도록, 구멍의 크기를 전선의 단면 보다 크게 한다.The light guide plate reflector 50 may be installed on the rear surface of the light guide plate, and although not shown, a transparent, translucent or opaque protective plate may be additionally installed on the back of the reflector. The light guide plate reflector 50 may be installed only at the rear portion of the light guide plate 30 on which the scattering pattern 31 is formed, or may be installed on the front surface of the light guide plate 30 and remove a portion corresponding to the lamp groove 10. In case of installing the rear protection plate, the hole for connecting the electric wire with the light source should be formed in the protection plate for processing, and in this case, the position of the hole is formed under the lamp groove of the light guide plate. In addition, the size of the hole is larger than the cross section of the wire so that the wire can be pushed back out without being pressed.

도3에 도시된 바와 같이, 램프로부터 입사되는 광을 도광판(30)의 산란패턴(31)이 형성된 부분으로 향하게 하기 위하여 램프 반사판(40)을 램프의 둘레에 설치할 수도 있다.As shown in FIG. 3, a lamp reflector 40 may be provided around the lamp to direct light incident from the lamp to a portion where the scattering pattern 31 of the light guide plate 30 is formed.

종래의 라이트 판넬과 달리 본 발명에 의한 라이트 판넬은 프레임을 필요로 하지 않는 다는 점에 특징이 있다. 다른 특징은 도광판(30)에 램프를 보호하기 위하여 도광판의 일부를 제거하여 램프를 설치하기 위한 홈(10)을 형성한 점이다. 다른 특징은 도광판(30)의 배면 전면에 산란 패턴을 형성하는 것이 아니라, 배면 내측의 일부, 바람직하기로는 도광판(30)의 중앙 부위에 형성된다는 것이다.Unlike conventional light panels, the light panel according to the present invention is characterized in that it does not require a frame. Another feature is that the groove 10 for installing the lamp is formed by removing a part of the light guide plate in order to protect the lamp on the light guide plate 30. Another feature is that a scattering pattern is not formed on the front surface of the rear surface of the light guide plate 30, but is formed in a portion inside the rear surface, preferably in a central portion of the light guide plate 30.

따라서, 램프를 보호하고 램프를 가리기 위한 프레임이 필요없게 되므로 더욱 다양한 디자인의 라이트 판넬을 설계할 수 있다.This eliminates the need for a frame to protect the lamp and to obscure the lamp, allowing the design of a wider variety of light panels.

본 발명에 의하면 램프가 도광판 자체의 무게나 충격에 의하여 파손되는 것을 방지 할 수 있으며, 프레임을 제거하고 라이트 판넬을 제작할 수 있게되어 프레임 제작비용을 절감할 수 있는 장점이 있다.According to the present invention can prevent the lamp from being damaged by the weight or impact of the light guide plate itself, it is possible to remove the frame to manufacture the light panel has the advantage of reducing the frame manufacturing cost.

또한 프레임이 필요없으므로, 라이트 판넬의 제작에 있어서 형상의 디자인을 자유로게 할 수 있는 장점이 있다.In addition, since there is no need for a frame, there is an advantage that the design of the shape can be made free in the manufacture of the light panel.

앞에서 설명되고, 도면에 도시된 본 발명의 일 실시예는, 본 발명을 기술적 사상을 한정하는 것으로 해석되어서는 안 된다. 본 발명의 보호범위는 청구범위에 기재된 사항에 의하여만 제한되고, 본 발명의 기술분야에서통상의 지식을 가진 자는 본 발명의 기술적 사상을 다양한 형태로 개량 변경하는 것이 가능하다. 따라서 이러한 개량 및 변경은 통상의 지식을 가진 자에게 자명한 것인 한 본 발명의 보호범위에 속하게 될 것이다.An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

Claims (3)

산란 패턴이 배면에 형성된 도광판과, 상기 도광판에 광을 입사하기 위한 램프를 포함하는 라이트 판넬 조립체에 있어서,A light panel assembly comprising a light guide plate having a scattering pattern formed on a rear surface thereof, and a lamp for injecting light into the light guide plate, 상기 도광판의 배면에 형성된 산란 패턴은 상기 도광판 배면의 내측 일부분에만 형성되어 있고,The scattering pattern formed on the rear surface of the light guide plate is formed only on an inner portion of the rear surface of the light guide plate, 상기 도광판은 상기 램프를 수용하기 위한 홈을 상기 도광판의 내부에 형성된 산란 패턴의 외측에 구비하고,The light guide plate has a groove for accommodating the lamp on an outer side of a scattering pattern formed inside the light guide plate, 상기 홈에 설치된 상기 램프는 직경이 상기 도광판의 두께보다 작은 것을 특징으로 하는 라이트 판넬 조립체.The lamp installed in the groove is light panel assembly, characterized in that the diameter is smaller than the thickness of the light guide plate. 제1항에 있어서, 상기 도광판의 전면에 설치된 투명 또는 반투명 소재의 보호판 더 포함하는 것을 특징으로 하는 라이트 판넬 조립체.The light panel assembly of claim 1, further comprising a protective plate of transparent or translucent material installed on the front surface of the light guide plate. 제1항에 있어서, 상기 도광판 배면에 설치된 반사판을 더 포함하는 것을 특징으로 하는 라이트 판넬 조립체.The light panel assembly of claim 1, further comprising a reflector disposed on a rear surface of the light guide plate.
KR1020010083884A 2001-12-24 2001-12-24 A light panel assembly KR20030053859A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04116522A (en) * 1990-09-06 1992-04-17 Seiko Epson Corp Back light system for liquid crystal display device
JPH09145935A (en) * 1995-11-28 1997-06-06 Mitsubishi Electric Corp Back lighting device
KR20000006308A (en) * 1998-06-22 2000-01-25 다카노 야스아키 Light guiding plate, and plane light source and display device using the same
JP2001067917A (en) * 1999-08-25 2001-03-16 Matsushita Electronics Industry Corp Surface light emitting device
JP2001143517A (en) * 1999-11-12 2001-05-25 Seiko Precision Inc Panel light emitting device
JP2001184924A (en) * 1999-12-24 2001-07-06 Sanyo Electric Co Ltd Plane light source apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04116522A (en) * 1990-09-06 1992-04-17 Seiko Epson Corp Back light system for liquid crystal display device
JPH09145935A (en) * 1995-11-28 1997-06-06 Mitsubishi Electric Corp Back lighting device
KR20000006308A (en) * 1998-06-22 2000-01-25 다카노 야스아키 Light guiding plate, and plane light source and display device using the same
JP2001067917A (en) * 1999-08-25 2001-03-16 Matsushita Electronics Industry Corp Surface light emitting device
JP2001143517A (en) * 1999-11-12 2001-05-25 Seiko Precision Inc Panel light emitting device
JP2001184924A (en) * 1999-12-24 2001-07-06 Sanyo Electric Co Ltd Plane light source apparatus

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