KR20040021178A - Back light source - Google Patents
Back light source Download PDFInfo
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- KR20040021178A KR20040021178A KR1020020052682A KR20020052682A KR20040021178A KR 20040021178 A KR20040021178 A KR 20040021178A KR 1020020052682 A KR1020020052682 A KR 1020020052682A KR 20020052682 A KR20020052682 A KR 20020052682A KR 20040021178 A KR20040021178 A KR 20040021178A
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
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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
- G02F1/133603—Direct backlight with LEDs
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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
- G02F1/133605—Direct backlight including specially adapted reflectors
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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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S362/00—Illumination
- Y10S362/80—Light emitting diode
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
본 발명은 면 광원장치에 관한 것으로, 특히, 저전력을 소모하면서도 고휘도를 갖는 면 광원장치에 관한 것이다.The present invention relates to a surface light source device, and more particularly, to a surface light source device having high brightness while consuming low power.
일반적으로, 음극선관(Cathod Ray Tube)과 같이 자체 발광능력을 갖는 디스플레이장치와는 달리 LCD(Liquid Crystal Display)와 같은 액정표시장치는 자체 발광능력을 갖고 있지 않다.In general, unlike a display device having a self-luminous capability such as a cathode ray tube, a liquid crystal display such as a liquid crystal display (LCD) does not have a self-luminous capability.
이러한 액정표시장치는 통상, 액정 소자의 뒷면에 면 형상을 갖는 조명 장치, 예컨데 백라이트(back light)(이하, "면 광원장치"라 한다.)가 설치되어 있다. 이 면 광원장치는 통상, 백색광을 출사하며, 면 광원장치에서 출사된 백색광은 컬러 필터를 갖는 액정소자의 선택적 구동에 의해 컬러화되어 디스플레이 된다. 따라서, 면 광원장치는 액정소자의 바로 뒷면에서 광을 투사하거나, 플라스틱(예컨데 아크릴판)으로 이루어지는 도광판을 이용하여 면 형상의 광원을 형성하는 방법이 주로 사용된다.Such a liquid crystal display device is usually provided with an illuminating device having a surface shape on the back of the liquid crystal element, for example, a back light (hereinafter referred to as a "plane light source device"). This surface light source device usually emits white light, and the white light emitted from the surface light source device is colored and displayed by selective driving of a liquid crystal element having a color filter. Therefore, the surface light source device mainly uses a method of projecting light from directly behind the liquid crystal element or forming a surface light source using a light guide plate made of plastic (for example, acrylic plate).
도 1은 종래의 면 광원장치의 구조를 도시한 것이다.1 shows the structure of a conventional surface light source device.
도시된 면 광원장치는, 점 광원(10), 광 가이드(11), 면형 반사판(12), 판형 반사판(reflector)(20), 도광판(30) 및 확산판(40)을 갖는다.The illustrated surface light source device includes a point light source 10, a light guide 11, a planar reflector 12, a plate reflector 20, a light guide plate 30, and a diffuser plate 40.
점 광원(10)은 통상 LED(Light Emitting Diode)나 CCFL(Cold Cathod Fluorescent Lamp)을 사용하여 소정의 휘도를 갖는 백색광을 생성한다.The point light source 10 typically uses white light emitting diodes (LEDs) or cold cathode fluorescent lamps (CCFLs) to generate white light having a predetermined luminance.
광 가이드(11)는 점 광원(10)에 의해 형성된 광을 투과시킴으로서 점 광원(10)을 선 광원으로 변환한다.The light guide 11 converts the point light source 10 into a line light source by transmitting the light formed by the point light source 10.
면형 반사판(12)은 선 광원을 도광판(30)으로 반사시킨다. 이에 따라, 도광판(30)에는 광 가이드(11)에서 투사된 빛이 다양한 각도로 입사된다. 여기서, 도광판(30)은 아크릴수지와 같이 빛을 잘 투과시키는 재질로 이루어진다.The planar reflecting plate 12 reflects the line light source to the light guide plate 30. Accordingly, the light projected from the light guide 11 is incident on the light guide plate 30 at various angles. Here, the light guide plate 30 is made of a material that transmits light well, such as acrylic resin.
판형 반사판(20)는 다양한 각도를 갖고 도광판(30)으로 입사된 광을 확산판(40)으로 반사시킨다.The plate reflector 20 reflects light incident on the light guide plate 30 to the diffuser plate 40 at various angles.
확산판(40)은 입사된 빛을 균일하게 퍼뜨리는 역할을 한다. 확산판(40)에의해 입사된 빛을 산란시킴으로서 광 가이드(11)와 거리가 먼 곳도 균일한 휘도를 갖도록 할 수 있다. 확산된 빛은 액정소자의 후면(미도시)를 비추게 된다.The diffusion plate 40 serves to spread the incident light uniformly. By scattering the light incident by the diffusion plate 40, it is possible to have a uniform luminance even at a distance far from the light guide 11. The diffused light illuminates the rear side of the liquid crystal device (not shown).
도 2는 도 1에 도시된 면 광원장치의 확산판(40)을 상세히 도시한 도면이다.FIG. 2 is a detailed view of the diffuser plate 40 of the surface light source device illustrated in FIG. 1.
도시된 바와 같이, 확산판(40)은 투명한 아크릴판을 베이스로 하여 삼각 프리즘(41a ∼ 41n)이 연속적으로 배열되는 형태를 갖는다. 이와 같은 프리즘(41a ∼ 41n)의 배열에 의해 판형 반사판(20)에 의해 반사된 빛이 프리즘(41a ∼ 41n)에 의해 산란됨으로서 본 확산판(40)에서 나오는 빛이 균일한 휘도를 갖게된다. 이때, 확산판(40)의 상단에는 프리즘(41a ∼ 41n)의 배열에 따른 빗금 무늬(42)가 형성되는데 통상 이를 확산판(40)의 패턴(pattern)이라 한다.As shown, the diffusion plate 40 has a form in which triangular prisms 41a to 41n are continuously arranged on the basis of a transparent acrylic plate. The light reflected by the plate-shaped reflector 20 is scattered by the prisms 41a to 41n by the arrangement of the prisms 41a to 41n, so that the light emitted from the diffuser plate 40 has uniform luminance. At this time, the hatched pattern 42 according to the arrangement of the prisms 41a to 41n is formed on the upper end of the diffusion plate 40, which is generally referred to as a pattern of the diffusion plate 40.
한편, 이러한 면 광원장치는 점 광원(10)을 선 광원으로 바꾸고, 이를 다시 반사와 확산에 의해 면 광원으로 변환하여야 하므로 변환과정에서 손실이 발생하게 된다. 광 가이드(11)에서 투사되는 빛 중에서 소정의 각도를 갖는 것만이 광가이드(11)의 맞은편까지 도달하므로, 이와 같은 면 광원장치는 5인치가 넘는 LCD의 면 광원장치로는 사용되지 않는다. 이러한 점 광원(10)에 의하여 넓은 면적(예컨데 5인치 이상의 면적)의 면 광원의 생성을 위해서는 점 광원(10)의 휘도를 높여야 하나, LED로는 5인치 이상의 면적을 갖는 도광판(30)에 균일한 휘도를 갖는 빛을 투사하기는 어렵다. 이러한 단점을 극복하기 위하여 점 광원(10)대신 CCFL을 선 광원으로서 직접 사용하기도 한다.On the other hand, such a surface light source device is to convert the point light source 10 to a line light source, and to convert it to a surface light source by reflection and diffusion again, so a loss occurs in the conversion process. Since only a predetermined angle of the light projected from the light guide 11 reaches the opposite side of the light guide 11, such a surface light source device is not used as a surface light source device of an LCD larger than 5 inches. In order to generate a surface light source having a large area (for example, an area of 5 inches or more) by the point light source 10, the brightness of the point light source 10 should be increased, but the LED is uniform to the light guide plate 30 having an area of 5 inches or more. It is difficult to project light with luminance. In order to overcome this disadvantage, CCFL may be directly used as a line light source instead of the point light source 10.
CCFL은 유리관과, 유리관 양끝에 전극이 붙어 있으며, 내부에는 일정량의 수은, 아르곤, 및 네온가스가 들어있다. 또한, 유리관 내부에는 형광체가 도포된다.이러한 CCFL의 구조는 통상적인 형광등과 거의 유사한 것으로, 초기 점등을 위해 인버터(inverter)를 필요로 하며, 양 전극에 고전압을 인가하면, 전극으로부터 전계에 의한 전자 방출이 일어나고, 방출된 전자가 형광체에 부딪혀 빛을 생성한다. 이러한 CCFL은 도 1과 도 2에서 전술한 면 광원장치에 적용시, 보다 높은 휘도를 갖는 빛을 생성할 수 있다. 그러나, CCFL은 고압의 인버터 회로에 의해 동작되므로, CCFL을 내장하는 액정표시장치의 주변회로에 고주파 간섭이 발생하게 되며, 수백mW ∼ 수W의 소비전력을 갖는다. 또한, LED에 비해 수명이 절반도 되지 않는 문제점이 있다.CCFLs have a glass tube, electrodes on both ends of the glass tube, and a certain amount of mercury, argon, and neon gas. In addition, a phosphor is coated inside the glass tube. The structure of the CCFL is almost similar to that of a conventional fluorescent lamp. An inverter is required for initial lighting, and when a high voltage is applied to both electrodes, electrons from an electrode are generated by an electric field. Emission occurs and the emitted electrons strike the phosphor to produce light. When applied to the surface light source device described above with reference to FIGS. 1 and 2, the CCFL may generate light having a higher luminance. However, since the CCFL is operated by a high voltage inverter circuit, high frequency interference occurs in the peripheral circuit of the liquid crystal display device incorporating the CCFL, and has a power consumption of several hundred mW to several W. In addition, there is a problem that the life is less than half compared to the LED.
본 발명은 상기한 종래의 문제점을 해결하기 위하에 안출된 것으로, 본 발명의 목적은 높은 휘도의 투사광을 생성하면서도, 저전력소모와 저전압 동작이 가능한 면 광원장치를 제공함에 있다.The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a surface light source device capable of low power consumption and low voltage operation while generating high luminance projection light.
도 1은 종래의 면 광원장치의 구조도,1 is a structural diagram of a conventional surface light source device;
도 2는 도 1에 도시된 확산판에 대한 상세 구조도,2 is a detailed structural diagram of the diffusion plate shown in FIG.
도 3은 본 발명에 따른 면 광원장치의 일실시예, 그리고3 is an embodiment of a surface light source device according to the present invention, and
도 4는 도 3에 도시된 광 투사관에 대한 상세도이다.4 is a detailed view of the light projection tube illustrated in FIG. 3.
*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
100 : 도광판 200 : 광 투사관100: light guide plate 200: light projection tube
210 ∼ 240 : 발광소자 250 ∼ 290 : 프리즘210 to 240 Light emitting elements 250 to 290 Prism
300 : 리플렉터 400 : 확산판300: reflector 400: diffusion plate
상기한 목적은 본 발명에 따라, 투명한 평판형태를 가지며, 일 표면을 광 출사면으로 하고 일측면은 광 입사면으로 하는 도광체, 도광체의 광 입사면에 복수로 할당된 영역마다 각각 독립적으로 빛을 출사할 수 있도록 광원 및 프리즘이 어레이 배열되는 광 투사부 및 도광체의 광 출사면의 반대편에 부착되며, 광 투사부로부터 투사되는 빛을 광 출사면 방향으로 반사하는 리플렉터에 의해 달성된다.According to the present invention, the above object has a transparent flat plate shape, one surface of which is a light exiting surface and one side of which is a light incident surface, each independently of a plurality of regions assigned to the light incident surface of the light guide. A light source and a prism are attached to the opposite side of the light exit surface of the light guide and the light guide unit in which the light sources and prisms are arranged so as to emit light, and are achieved by a reflector reflecting light projected from the light projecting direction in the light exit plane direction.
바람직하게는, 도광체의 광 출사면상에 설치되어 상기 도광체로부터 입사된 빛을 산란시키는 확산판을 더 포함한다.Preferably, the apparatus further includes a diffuser plate disposed on the light exit surface of the light guide to scatter light incident from the light guide.
바람직하게는, 광 투사부는, 도광체의 할당 영역마다 도광체의 입사면에 설치되고, 광원은 도광체의 입사면에 부착되는 프리즘의 일면에 설치된다.Preferably, the light projecting unit is provided on the incident surface of the light guide for each allocation region of the light guide, and the light source is provided on one surface of the prism attached to the incident surface of the light guide.
바람직하게는, 광원은, 반도체 발광소자로 이루어진다.Preferably, the light source consists of a semiconductor light emitting element.
이하, 도면을 참조하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the drawings.
도 3은 본 발명에 따른 면 광원장치의 일실시예를 도시한 것이다.3 shows an embodiment of a surface light source device according to the present invention.
도시된 면 광원장치는, 도광판(100), 광 투사부(200), 리플렉터(300), 및 확산판(400)을 갖는다.The illustrated surface light source device includes a light guide plate 100, a light projection unit 200, a reflector 300, and a diffusion plate 400.
광 투사부(200)은 도광판(100)의 일 측면에 부착되며, 어레이 배열된 LED(210 ∼ 240)로 부터 발생되는 빛을 프리즘(250 ∼ 290)에 의해 산란시켜 도광판(100)으로 전달한다. 도광판(100)은 유리나 투명 아크릴 재질로 이루어지며, 광 투사부(200)으로부터 인가된 빛이 이동하는 통로가 된다. 여기서, LED(210 ∼ 240)가 각각의 프리즘(250 ∼ 290)마다 하나씩 구비됨으로서, 도광판(100) 전체에 걸쳐 균일하게 빛이 투사되어, 5인치급 이상의 LCD의 면 광원으로 사용할 수 있다.The light projecting unit 200 is attached to one side of the light guide plate 100, and scatters the light generated from the arrayed LEDs 210 to 240 by the prism 250 to 290 and transmits the light to the light guide plate 100. . The light guide plate 100 is made of glass or transparent acrylic material, and becomes a passage through which the light applied from the light projector 200 moves. Here, since LEDs 210 to 240 are provided for each prism 250 to 290, light is uniformly projected over the entire light guide plate 100, and thus, the LEDs 210 to 240 may be used as surface light sources of LCDs of 5 inches or more.
리플렉터(300)는 프리즘(250 ∼ 290)에 의해 산란된 빛을 확산판(400)으로 반사시킨다.The reflector 300 reflects the light scattered by the prisms 250 to 290 to the diffuser plate 400.
확산판(400)은 투명 합성수지로 이루어지며, 도광판(100)에서 빛이 출사되는 방향에 배치되어 리플렉터(300)로부터 반사된 빛을 확산시키기 위한 소정의 프리즘으로 구성된다. 확산판(400)은 전술한 바와 같이 소정의 확산판 패턴(미도시)을 가지며, 리플렉터(300)에 의해 반사된 빛을 좀 더 균일하게 분산시킨다. 이에 대한 자세한 설명은 이미 도 2에서 설명되었으므로 이하 생략하도록 한다.The diffusion plate 400 is made of a transparent synthetic resin, and is disposed in a direction in which light is emitted from the light guide plate 100, and is configured of a predetermined prism for diffusing the light reflected from the reflector 300. The diffusion plate 400 has a predetermined diffusion plate pattern (not shown) as described above, and more uniformly distributes the light reflected by the reflector 300. Since a detailed description thereof has already been described with reference to FIG. 2, it will be omitted below.
도 4는 도 3에 도시된 광 투사부(200)의 일부에 대한 상세도를 나타낸다.4 is a detailed view of a part of the light projector 200 shown in FIG. 3.
도시된 바와 같이, 광 투사부(200)은 동일한 각도를 갖는 프리즘(250 ∼ 290)의 b면상에 LED(210 ∼ 240)를 구비한다. a면은 b변에 부착된 LED(210 ∼ 240)에서 투사된 투사광을 굴절시켜 산란시키는 역할을 한다. 바람직하게는, LED(210 ∼ 240)는 120도의 투사각을 갖도록 한다. 이에 따라, LED에 의해 생성된 빛은 프리즘(250 ∼ 290)의 a면에 골고루 투사되며, 투사된 빛은 프리즘(250 ∼ 290)에 의해 산란되어 도광판(100)에 고루 비춰지게 된다. 통상적으로 LED는 5V의 전압에 의해 동작되며, 100mW급의 전력소모를 갖는다. 따라서, 본 발명에 따른 면 광원장치는 CCFL과 같이 고압의 교류전원에 의해 동작되지 않으므로 주변회로에 고주파 노이즈를 가하지 않으며, 전력소모 또한 매우 적다. 또한, LED는 반도체 소자이므로 통상 50,000 시간 이상의 긴 수명을 가진다. 따라서, 종래의 광 가이드를 이용한 방식에 비해 도광판(100) 전체의 휘도가 균일하면서도 높아지며, 본 발명에 따른 면 광원장치는 CCFL을 이용하는 것에 비해 긴 수명을 가진다.As shown, the light projection unit 200 includes LEDs 210 to 240 on the b faces of the prisms 250 to 290 having the same angle. Surface a serves to refract and scatter the projection light projected from the LEDs 210 to 240 attached to the side b. Preferably, the LEDs 210 to 240 have a projection angle of 120 degrees. Accordingly, the light generated by the LED is evenly projected on the a planes of the prisms 250 to 290, and the projected light is scattered by the prisms 250 to 290 to be evenly reflected on the light guide plate 100. Typically, the LED is operated by a voltage of 5V, has a power consumption of 100mW class. Therefore, since the surface light source device according to the present invention is not operated by a high-voltage AC power source, such as CCFL, it does not apply high frequency noise to the peripheral circuit and consumes very little power. In addition, since LEDs are semiconductor devices, they usually have a long life of 50,000 hours or more. Accordingly, the luminance of the entire light guide plate 100 is uniform and higher than that of the conventional light guide method, and the surface light source device according to the present invention has a longer life than that of the CCFL.
한편, 본 발명에 따른 면 광원장치는 소정 거리마다 배치된 LED에 의해 발생하는 빛이 도광판(100)에 인가되므로 확산판(400)을 사용하지 않아도 된다. 이 경우, 본 발명에 따른 면 광원장치는 종래의 면광원장치에 비해 제작 공정 및 단가를 낮출 수 있다. 본 실시예에서 설명된 바와 같이, 어레이 배열된 LED와 프리즘으로 구성되는 광 투사부(200)에 의해 산란된 빛이 도광판(100)에 직접 투사되므로 본 발명에 따른 면 광원장치는 별도의 확산판을 구비하지 않아도 균일한 휘도를 갖는 면 광원을 생성할 수 있다.On the other hand, in the surface light source device according to the present invention, since the light generated by the LEDs arranged at predetermined distances is applied to the light guide plate 100, it is not necessary to use the diffusion plate 400. In this case, the surface light source device according to the present invention can lower the manufacturing process and cost compared to the conventional surface light source device. As described in this embodiment, since the light scattered by the light projection unit 200 composed of the array-arranged LED and the prism is directly projected on the light guide plate 100, the surface light source device according to the present invention is a separate diffuser plate It is possible to generate a surface light source having a uniform luminance even without having.
본 발명은 상기한 바와 같이 LED와 같은 반도체 발광소자를 사용하면서도 CCFL을 사용한 것과 유사한 휘도를 갖는 투사광을 생성함으로서 5인치 이상의 LCD에 응용할 수 있다. 또한, 본 발명은 CCFL에 비해 낮은 전력을 소모하며, CCFL과 같은 고압의 구동전압을 필요로 하지 않는다. 따라서, 본 발명의 면 광원장치를 액정표시장치에 적용시, 저전력, 고휘도의 액정표시장치를 구현할 수 있다.The present invention can be applied to LCDs of 5 inches or more by using a semiconductor light emitting device such as an LED as described above, but generating projection light having a brightness similar to that of using CCFLs. In addition, the present invention consumes lower power than CCFLs and does not require a high voltage driving voltage such as CCFLs. Therefore, when the surface light source device of the present invention is applied to a liquid crystal display device, a liquid crystal display device of low power and high brightness can be realized.
Claims (4)
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| KR1020020052682A KR20040021178A (en) | 2002-09-03 | 2002-09-03 | Back light source |
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| KR1020020052682A KR20040021178A (en) | 2002-09-03 | 2002-09-03 | Back light source |
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| WO2007064096A1 (en) * | 2005-11-29 | 2007-06-07 | Lgs Co., Ltd. | Backlight unit |
| KR100783501B1 (en) * | 2006-08-10 | 2007-12-07 | (주) 엘씨디컴 | Backlight module using light emitting diode in liquid crystal display |
| KR100887749B1 (en) * | 2007-03-30 | 2009-03-12 | 주식회사 우영 | Poly Integrated Prism Lens and Back Light Unit therewith |
| US7659951B2 (en) | 2005-08-26 | 2010-02-09 | Samsung Electronics Co., Ltd. | Direct light type backlight unit and liquid crystal display |
| US7728923B2 (en) | 2005-09-09 | 2010-06-01 | Samsung Electronics Co., Ltd. | Backlight unit and display device having the same |
| US8164564B2 (en) | 2005-09-05 | 2012-04-24 | Samsung Electronics Co., Ltd. | Liquid crystal display and method of controlling the same |
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