KR20000007113A - Fluorescent Lamp Planar-Array Type LCD Back-Light - Google Patents

Fluorescent Lamp Planar-Array Type LCD Back-Light Download PDF

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Publication number
KR20000007113A
KR20000007113A KR1019990053193A KR19990053193A KR20000007113A KR 20000007113 A KR20000007113 A KR 20000007113A KR 1019990053193 A KR1019990053193 A KR 1019990053193A KR 19990053193 A KR19990053193 A KR 19990053193A KR 20000007113 A KR20000007113 A KR 20000007113A
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South Korea
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light
lamp
guide plate
light guide
fluorescent lamp
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KR1019990053193A
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Korean (ko)
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KR100385692B1 (en
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조광섭
최은하
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조광섭
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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
    • G02F1/133604—Direct backlight with lamps
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means

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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)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE: A fluorescent light lamp flat arranged backlight of liquid crystal display is provided to improve a brightness. CONSTITUTION: The backlight comprises a cylindrical cold cathode fluorescent lamp(1) is linearly arranged on a reflection plate(2). A lamp groove is installed in lower face of a PMMA light plate(3) to insert the fluorescent lamp. A pattern minutely groove is formed in lower face of the light plate(3). A minutely protrusion line(5) is formed on the light plate. A plurality of fluorescent lamps is arranged on a flat panel.

Description

형광 램프 평면 배열형 ＬＣＤ 백라이터{Fluorescent Lamp Planar-Array Type LCD Back-Light}Fluorescent Lamp Planar-Array Type LCD Back-Light}

본 발명은 액정디스플레이(Liquid Crystal Display; LCD)의 광원으로 사용되는 소위 LCD-백라이터로서 고 휘도와 고 효율을 위하여 고안되었다. 종래의 LCD용 백라이터는 직하형 방식과 도광판 방식이 있다. 직하형은 평면에 형광램프를 배치한다. 직하형은 형광램프의 형상이 액정패널에 나타나므로 램프와 액정패널 사이의 간격을 상당히 유지해야한다. 따라서 직하형은 박형화에 한계가 있으며, 패널 전체 광도의 균일도에 문제가 있다. 도광판 방식은 평판 외곽에 형광램프를 설치하여 도광판을 이용하여 전체의 면으로 빛을 분산한다. 형광램프가 측면에 설치되고 빛이 도광판을 통하므로 근본적으로 휘도가 낮다. 또한 균일한 광도의 분포를 위하여 도광판에 대한 고도의 광학적 설계기술과 가공기술이 요구된다. 그러나 LCD의 패널이 대화면화되고 모니터와 TV 용으로 사용되기 위하여는 5000 cd/ ㎡ 이상의 고 휘도가 요구된다. 이러한 경우 종래의 도광판 방식에서와 같은 측면에 형광램프를 배치하는 방식으로는 고 휘도의 달성이 어렵다. 따라서 직하형의 방식에 도광판과 반사판 등의 광학계를 사용하여 박형에서의 고 휘도를 구현하는 것이 본 발명의 목적이다.The present invention is a so-called LCD backlighter used as a light source of a liquid crystal display (LCD) and is designed for high brightness and high efficiency. Conventional LCD backlighters include a direct type method and a light guide plate method. The direct type places the fluorescent lamp in the plane. In the direct type, since the shape of the fluorescent lamp appears on the liquid crystal panel, the gap between the lamp and the liquid crystal panel should be kept considerably. Therefore, the direct type has a limitation in thinning, and there is a problem in the uniformity of the overall brightness of the panel. In the LGP method, a fluorescent lamp is installed outside the flat plate to distribute light to the entire surface using the LGP. Fluorescent lamps are installed on the side and light passes through the light guide plate, so the brightness is fundamentally low. In addition, high optical design and processing technology for the light guide plate is required for uniform light distribution. However, high brightness of more than 5000 cd / m 2 is required for LCD panels to be large screened and used for monitors and TVs. In this case, it is difficult to achieve high luminance by arranging the fluorescent lamp on the side as in the conventional light guide plate method. Therefore, it is an object of the present invention to realize high brightness in a thin form by using an optical system such as a light guide plate and a reflecting plate in a direct type.

본 발명은 기본적으로 시중에 판매되고 있는 2mm 정도 직경의 미세관 형광램프를 사용한다. 종래의 도광판 방식에서 측면에 위치한 형광램프(side-light)의 경우에는 LCD 패널의 대형화에 따라서 고 휘도의 요구에 맞도록 램프 전류가 커야 한다. 그러나 본 발명에서는 기본적으로 각각의 형광램프에 저 전류로서 분산되므로 열의 문제나 소모 전력의 측면에서 유리하다. 다만 본 발명에서는 램프의 상단과 램프의 사이의 위치에서의 휘도의 차이를 최소화하는 것이 본 발명의 관건이다. 이는 도광판과 반사판에 빛의 분산을 위한 광학적인 형태와 특정한 패턴에 의하여 휘도를 균일하도록 하는 것이 기술적인 과제이다.The present invention basically uses a commercially available microtube fluorescent lamp with a diameter of about 2 mm. In the conventional light guide plate method, the side of the fluorescent lamp (side-light) has to increase the lamp current in order to meet the demand of high brightness according to the large size of the LCD panel. However, in the present invention, since it is basically dispersed as a low current in each fluorescent lamp, it is advantageous in terms of heat problem and power consumption. In the present invention, however, it is important to minimize the difference in luminance at the position between the top of the lamp and the lamp. The technical problem is that the luminance is uniform by a specific pattern and an optical shape for dispersing light on the light guide plate and the reflecting plate.

도 1은 형광 램프 평면 배열형 LCD 백라이터의 개념도이다. 형광 램프를 반사판 위에 배열하고 도광판 하부에 형광 램프가 들어가도록 골을 파고 휘도의 균일도를 위하여 미세한 홈를 설치한다. 그위에 확산필름과 프리즘필름이 설치된다.1 is a conceptual diagram of a fluorescent lamp flat array LCD backlighter. The fluorescent lamps are arranged on the reflecting plate, the grooves are dug in the lower part of the light guide plate, and fine grooves are provided for uniformity of luminance. On top of that, diffusion film and prism film are installed.

도 2는 도광판을 사용하지 않은 형광 램프 평면 배열형 LCD 백라이터이다.2 is a fluorescent lamp flat array LCD backlighter without a light guide plate.

도 3은 도광판(a)과 반사판(b), 그리고 이들을 결합한 조립도(c)이다.3 is a light guide plate (a) and a reflecting plate (b), and the assembled view (c) combining them.

도면의 주요부분에 대한 부호는 다음과 같다.Reference numerals of the main parts of the drawings are as follows.

1; 형광 램프, 2; 반사판, 3; 도광판(PMMA sheet), 4; 램프홈, 5; 하부 미세홈, 6; 상부 미세홈, 7; 확산필름(diffusion film), 8; 프리즘필름(prism sheet), 9; 도광판 경사면, 10; 램프 받침홈, 11; 반사판 경사면One; Fluorescent lamp, 2; Reflector 3; A light guide plate (PMMA sheet), 4; Lamp groove, 5; Lower microgroove, 6; Upper microgroove, 7; Diffusion film, 8; Prism sheet, 9; Light guide plate slope, 10; Lamp stand, 11; Reflector slope

본 발명은 대화면용 액정 디스플레이(LCD; Liquid Crystal Display)장치의 고 휘도의 LCD-백라이터이다. 종래의 직하형 방식과 같이 다수의 형광램프를 평면에 배열하고 도광판과 반사판의 형태와 빛의 산란을 위한 패턴을 만들어서 균일한 휘도를 갖도록 고안된 박형 백라이터이다.The present invention is a high-brightness LCD-writer of a large liquid crystal display (LCD) device. Like a conventional direct type, a plurality of fluorescent lamps are arranged in a plane, and the shape of a light guide plate and a reflecting plate and a pattern for scattering light are thin backlights designed to have uniform luminance.

도 1은 본 발명의 LCD용 백라이터의 개념도 이다. 종래의 실린더형 냉음극 형광등(1)을 반사판(2) 위에 다중으로 선형 배열한다. 박형의 백라이터를 위하여 형광램프의 직경은 시판되는 미세관을 채택한다. PMMA재질의 도광판(3)의 하단면에는 형광램프가 들어가도록 램프홈(4)을 설치하고 램프홈 사이의 도광판 하단면에는 빛의 난반사를 위한 미세홈(5, 6)의 패턴을 만든다. 램프홈 상단의 도광판에는 볼록형 미세 돌출선(5)을 패턴한다. 램프 사이의 도광판 하단에는 오목형의 미세홈(6)을 설치한다. 이러한 패턴은 형광램프 상단과 형광램프 사이의 휘도를 균일하게 할 목적이다. 이때 형광램프 자체의 휘도와 램프 사이의 거리에 따라서 패턴을 설계한다. 도광판 위에는 확산필름(7)과 프리즘필름(8)을 설치하는 것은 종래의 백라이터와 동일하다.1 is a conceptual diagram of an LCD backlighter of the present invention. A conventional cylindrical cold cathode fluorescent lamp 1 is linearly arranged in multiples on the reflecting plate 2. For thin backlights, the diameter of the fluorescent lamps is a commercially available microtube. The lower surface of the light guide plate 3 of PMMA material is provided with a lamp groove 4 so that a fluorescent lamp enters, and the light guide plate between the lamp grooves makes a pattern of fine grooves 5 and 6 for diffuse reflection of light. A convex fine protrusion line 5 is patterned on the light guide plate at the top of the lamp groove. The concave microgroove 6 is installed at the lower end of the light guide plate between the lamps. This pattern is intended to uniform the luminance between the top of the fluorescent lamp and the fluorescent lamp. The pattern is designed according to the brightness of the fluorescent lamp itself and the distance between the lamps. The provision of the diffusion film 7 and the prism film 8 on the light guide plate is the same as in the conventional backlight.

도 2는 도광판을 사용하지 않고 다수의 형광램프만을 배열한 백라이터이다. 이때는 형광램프의 휘도에 따라서 형광램프 간의 거리를 적절하게 유지하여 휘도의 균일도를 유지한다. 다만 휘도의 균일도를 위하여 반사판(2)의 형태를 특별히 설계하고 미세홈 등의 패턴을 추가로 설치한다.2 is a backlight unit in which only a plurality of fluorescent lamps are arranged without using a light guide plate. At this time, the distance between the fluorescent lamps is appropriately maintained according to the luminance of the fluorescent lamps to maintain the uniformity of the luminance. However, the shape of the reflector 2 is specially designed for the uniformity of luminance, and a pattern such as a fine groove is additionally installed.

도 1과 2의 구조에서 다수의 형광램프를 사용함으로서 근원적으로 고 휘도가 가능하고 효율도 유리하다. 종래의 가장자리에 형광램프를 설치하는 방식은 고 휘도를 요구하는 대화면의 경우는 형광램프 자체의 휘도를 극대화하여야 하므로 고 전류에 의한 램프 자체의 고열의 문제로 고 휘도에 매우 제한적이다. 그러나 다수의 형광램프의 사용은 오히려 개별 램프의 휘도를 제한하기 위하여 저 전류 구동을 하므로 소비 전력과 램프 수명의 측면에서 매우 유리하다.By using a plurality of fluorescent lamps in the structure of Figs. 1 and 2, high luminance is possible and advantageously advantageous in principle. The conventional method of installing a fluorescent lamp on the edge is very limited to high luminance due to the problem of high heat of the lamp itself due to high current in the case of a large screen requiring high luminance should maximize the luminance of the fluorescent lamp itself. However, the use of a large number of fluorescent lamps are rather advantageous in terms of power consumption and lamp life, since they operate at a low current to limit the brightness of individual lamps.

본 발명에서는 전체 화면의 균일한 휘도를 위하여 도광판과 반사판의 형태와 난반사를 위한 패턴이 중요하다. 도 1과 같이 도광판의 상단과 하단면에 일정한 패턴을 형성하는 방식이외에 도 3과 같은 도광판과 반사판의 구조가 가능하다. 도 3에서 도광판의 하단면에 형광램프를 넣는 램프홈(4)이 설치되고 램프홈의 사이의 하단에 오목형 경사면(9)을 형성한다. 반사판에는 램프 받침홈(10)을 볼록하게 설치하고 도광판의 램프홈 사이의 오목형 경사면에 밀착되도록 볼록형 경사면(11)을 만든다. 반사면 전체에는 빛의 반사를 위하여 코팅 처리한다. 기타 여러 가지의 방식으로 휘도의 균일도와 고 휘도의 목적에 맞는 개별 램프의 휘도, 램프의 수, 그리고 램프 사이의 간격에 따라서 특정한 패턴을 만든다.In the present invention, the shape of the light guide plate and the reflector and the pattern for diffuse reflection are important for uniform brightness of the entire screen. In addition to the method of forming a predetermined pattern on the upper and lower surfaces of the light guide plate as shown in FIG. In FIG. 3, a lamp groove 4 for placing a fluorescent lamp on the bottom surface of the light guide plate is installed, and a concave inclined surface 9 is formed between the lamp grooves. The lamp support groove 10 is convexly installed in the reflecting plate, and the convex inclined surface 11 is made to be in close contact with the concave inclined surface between the lamp grooves of the light guide plate. The entire reflecting surface is coated to reflect light. In many other ways, a specific pattern is created according to the uniformity of brightness and the brightness of the individual lamps for the purpose of high brightness, the number of lamps, and the distance between the lamps.

브라운관을 대신하는 표시장치로서 LCD의 용도가 넓어지고 있다. 노트북 PC에서 테스크탑 모니터 및 액정TV의 영역으로 확대되고 있는 추세이다. 따라서 백라이터의 크기도 10 인치급에서 20 인치 이상의 대화면 용으로 그 수요가 증대되고 있다. 동시에 고 휘도와 고 효율을 요구하고 있다. 이러한 관점에서 본 발명에서 제안된 백라이터의 방식은 기존의 개별 형광램프의 최고의 휘도와 고 효율의 특성을 갖는다. 따라서 백라이터의 휘도가 대화면의 LCD에 제한적인 요소가 되지 않으므로 LCD의 기술 증진과 시장 확대에 큰 변화를 가져올 것이다.The use of LCDs as display devices replacing CRTs is being expanded. The trend is expanding from notebook PCs to desktop monitors and LCD TVs. Therefore, the size of the backlight is also increasing in demand for large screens of 10 inches to 20 inches or more. At the same time, high brightness and high efficiency are required. In this respect, the proposed backlight writer has the characteristics of the highest brightness and high efficiency of the conventional individual fluorescent lamps. Therefore, since the brightness of the backlight is not a limiting factor for the LCD of the large screen, it will bring a big change in the LCD technology enhancement and market expansion.

Claims (3)

다수의 형광램프를 평면상에 배열하여 도광판과 반사판을 사용한 박형 구조로서 종래의 직관형 방식과 도광판 방식의 혼합형 LCD용 백라이터.A thin-light structure using a light guide plate and a reflecting plate by arranging a plurality of fluorescent lamps on a plane, and a conventional LCD and light guide plate mixed lighter. 도 2와 같이 도광판을 사용하지 않고 다수의 형광램프를 일정한 간격으로 배열하여 휘도의 균일도를 유지하는 방식의 박형 구조의 LCD용 백라이터.A thin backlight LCD for writers of a method of maintaining the uniformity of brightness by arranging a plurality of fluorescent lamps at regular intervals without using a light guide plate as shown in FIG. 도 1과 도 2의 박형 구조에서 다수의 형광램프를 평면상에 배열하고 균일한 휘도를 유지하기 위하여 도 3과 같이 반사판에 형광램프 받침홈을 설치하고 램프 사이의 반사면에 경사면이나 특정한 패턴을 설치한 반사판의 구조.In the thin structure of FIGS. 1 and 2, in order to arrange a plurality of fluorescent lamps on a plane and maintain uniform luminance, a fluorescent lamp support groove is installed in the reflector as shown in FIG. 3, and a slope or a specific pattern is provided on the reflective surfaces between the lamps. Structure of the installed reflector.
KR10-1999-0053193A 1999-11-26 1999-11-26 Fluorescent Lamp Planar-Array Type LCD Back-Light KR100385692B1 (en)

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KR100433586B1 (en) * 2001-03-15 2004-05-31 주식회사 우영 Holder For External Electrode Discharge Lamp
KR100454824B1 (en) * 2002-03-05 2004-11-05 주식회사 광운디스플레이기술 The back light for LCD
KR100499645B1 (en) * 2002-08-29 2005-07-05 주식회사 광운디스플레이기술 The back light of fluorescent lamps moulded with the light guide resin
KR100616625B1 (en) * 2004-10-20 2006-08-28 삼성전기주식회사 Large size backlight apparatus reduced in thickness
KR100665011B1 (en) * 2004-11-08 2007-01-09 삼성전기주식회사 Backlight apparatus having leds
KR100689205B1 (en) * 2003-07-30 2007-03-02 미쓰비시덴키 가부시키가이샤 Plane-type light source device and display device comprising light source device
KR100698465B1 (en) * 2004-03-23 2007-03-23 엔이씨 엘씨디 테크놀로지스, 엘티디. Lighting apparatus and reflection member
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KR100433586B1 (en) * 2001-03-15 2004-05-31 주식회사 우영 Holder For External Electrode Discharge Lamp
KR100421297B1 (en) * 2001-08-07 2004-03-09 주식회사 우영 Direct-light-type plane light source structure
KR100454824B1 (en) * 2002-03-05 2004-11-05 주식회사 광운디스플레이기술 The back light for LCD
KR100830077B1 (en) * 2002-04-15 2008-05-16 엘지디스플레이 주식회사 Backlight Unit And Method Of Fabricating A Reflecting Plate Thereof
KR100499645B1 (en) * 2002-08-29 2005-07-05 주식회사 광운디스플레이기술 The back light of fluorescent lamps moulded with the light guide resin
KR100689205B1 (en) * 2003-07-30 2007-03-02 미쓰비시덴키 가부시키가이샤 Plane-type light source device and display device comprising light source device
KR100989168B1 (en) * 2003-11-11 2010-10-20 엘지디스플레이 주식회사 back light and method for manufacturing the same
KR100698465B1 (en) * 2004-03-23 2007-03-23 엔이씨 엘씨디 테크놀로지스, 엘티디. Lighting apparatus and reflection member
KR100616625B1 (en) * 2004-10-20 2006-08-28 삼성전기주식회사 Large size backlight apparatus reduced in thickness
KR100665011B1 (en) * 2004-11-08 2007-01-09 삼성전기주식회사 Backlight apparatus having leds

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