KR20040013206A - Backlight unit of liquid crystal display device - Google Patents
Backlight unit of liquid crystal display device Download PDFInfo
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- KR20040013206A KR20040013206A KR1020020046035A KR20020046035A KR20040013206A KR 20040013206 A KR20040013206 A KR 20040013206A KR 1020020046035 A KR1020020046035 A KR 1020020046035A KR 20020046035 A KR20020046035 A KR 20020046035A KR 20040013206 A KR20040013206 A KR 20040013206A
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- light
- plate
- guide plate
- light guide
- liquid crystal
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
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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
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/02—Function characteristic reflective
Abstract
Description
본 발명은 액정표시장치의 백라이트 유니트에 관한 것으로, 보다 상세하게는 슬림화되고 휘도가 향상된 액정표시장치의 백라이트 유니트에 관한 것이다.The present invention relates to a backlight unit of a liquid crystal display device, and more particularly, to a backlight unit of a liquid crystal display device having a slimmer and improved luminance.
액정표시소자는 박형화, 경량화, 저소비 전력, 구동회로와의 정합성등의 이유로 그 사용범위가 확대되어 가고 있다. 일반적으로 사용되고 있는 투광형 액정표시소자는 자체발광을 하지 못하므로 백라이트가 필요하며, 액정표시소자의 성능은그 자체 뿐만아니라 사용하는 백라이트 유니트의 성능에 의존하는 바가 크다.BACKGROUND OF THE INVENTION Liquid crystal display devices are expanding in their use range due to thinness, light weight, low power consumption, and compatibility with driving circuits. In general, a light-transmitting liquid crystal display device does not emit light by itself and thus requires a backlight, and the performance of the liquid crystal display device is largely dependent on the performance of the backlight unit used as well.
도 1은 종래의 액정표시장치의 백라이트 유니트를 도시한 단면도이다.1 is a cross-sectional view illustrating a backlight unit of a conventional liquid crystal display device.
종래의 액정표시장치의 백라이트 유니트는, 도 1에 도시된 바와 같이, 광원(100)과, 상기 광원(100)을 둘러싸고 있는 램프 반사체(110)와, 인쇄 패턴(120)이 형성되어 있는 도광판(130)과, 상기 도광판(130)의 하면과 상면에 각각 형성된 반사판(140) 및 확산판(150)과, 빛을 집광하여 출력하는 프리즘판(160) 등으로 구성된다. 이때, 상기 프리즘판(160)은 하부 프리즘판(161) 및 상부 프리즘판(162)으로 구성되어 있다. 한편, 프리즘판(160)을 보호하기 위하여 보호판(170)이 배치되기도 한다.As shown in FIG. 1, a backlight unit of a conventional liquid crystal display device includes a light guide plate on which a light source 100, a lamp reflector 110 surrounding the light source 100, and a printing pattern 120 are formed. 130, a reflector plate 140 and a diffusion plate 150 formed on the bottom and top surfaces of the light guide plate 130, and a prism plate 160 for condensing and outputting light. At this time, the prism plate 160 is composed of a lower prism plate 161 and an upper prism plate 162. Meanwhile, the protective plate 170 may be disposed to protect the prism plate 160.
이와 같이 구성된 액정표시장치의 백라이트 유니트는, 광원(100)로부터 발생되어진 빛이 램프 반사체(110)에 의해 반사되고, 도광판(130)과 확산판(150)을 통해 액정패널(미도시)로 입사되어 소정의 화상이 형성되도록 하는 바, 이때 광원(100)에서 나온 빛은 반사판(140)에 의해 외부로의 누출이 방지된 채 도광판(130)으로 입사되어 고르게 산란된다. 이와 같이 산란된 빛은 확산판(150)에 의해 더욱 균일화된 후, 프리즘판(160)을 통과하면서 일정각으로 진행 경로가 전환된 후, 편광판(미도시)으로 수직하게 입사되어 어느 한 방향의 선편광이 된다.In the backlight unit of the liquid crystal display device configured as described above, light generated from the light source 100 is reflected by the lamp reflector 110 and is incident on the liquid crystal panel (not shown) through the light guide plate 130 and the diffusion plate 150. In order to form a predetermined image, light emitted from the light source 100 is incident on the light guide plate 130 while being prevented from leaking to the outside by the reflection plate 140 and scattered evenly. The light scattered as described above is further uniformized by the diffuser plate 150, and then the path of propagation is switched at a predetermined angle while passing through the prism plate 160, and then the light is vertically incident to the polarizing plate (not shown). Linear polarization.
그러나, 종래 기술에 따른 액정표시장치의 백라이트 유니트에 있어서는 다음과 같은 문제점이 있다.However, the backlight unit of the liquid crystal display according to the prior art has the following problems.
최근 얇고 가벼운 무게의 액정표시장치의 요구가 증가되어 왔는데, 이에 부합하기 위하여 백라이트 유니트의 도광판을 얇게 하는 경우 도광판 하부에 인쇄되 인쇄 도트가 상부에서 보이게 되고 휘도가 저하되었다. 또한, 폴리에틸렌테레프탈레이트(Poly Ethylene Terephthalate)와 같은 연한 재질로 된 반사판은 열에 의하여 수축 팽창하게 되어서 주름 현상이 나타내게 되고 이에 따라 전체화면의 품질이 떨어지는 문제점이 있었다.Recently, there has been an increasing demand for a thin and light liquid crystal display device. In order to cope with this, when the light guide plate of the backlight unit is thinned, printed dots are printed on the lower part of the light guide plate and the luminance of the printed dots is lowered. In addition, the reflector plate made of a soft material such as polyethylene terephthalate (Poly Ethylene Terephthalate) is contracted and expanded by heat, the wrinkles appear and there is a problem that the quality of the entire screen is deteriorated.
이에 본 발명은 상기한 종래 기술상의 문제점을 해결하기 위하여 안출된 것으로, 본 발명의 목적은 반사판을 대신하여 도광판 하부에 은이나 알루미늄층을 형성하여 슬림화 및 휘도가 향상된 액정표시장치의 백라이트 유니트를 제공함에 있다.Accordingly, the present invention has been made to solve the above-mentioned problems in the prior art, and an object of the present invention is to provide a backlight unit of a liquid crystal display device having a slimmer and improved brightness by forming a silver or aluminum layer under the light guide plate instead of the reflecting plate. Is in.
도 1은 종래 기술에 따른 액정표시장치의 백라이트 유니트를 도시한 단면도.1 is a cross-sectional view showing a backlight unit of a liquid crystal display according to the prior art.
도 2는 본 발명에 따른 액정표시장치의 백라이트 유니트를 도시한 단면도.2 is a cross-sectional view showing a backlight unit of a liquid crystal display according to the present invention;
* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
200; 광원210; 램프 반사체200; Light source 210; Lamp reflector
220; 도트 패턴230; 도광판220; Dot pattern 230; Light guide plate
240; 반사층250; 확산판240; Reflective layer 250; Diffuser
260; 프리즘판270; 보호판260; Prism plate 270; Shroud
상기 목적을 달성하기 위한 본 발명에 따른 액정표시장치의 백라이트 유니트는, 광원; 상기 광원을 둘러싸고 있는 램프 반사체; 상기 광원에서 발생되는 빛을 이동시키는 도광판; 상기 도광판 상면에 형성되어 난반사된 빛을 확산시키는 확산판; 상기 도광판 하면에 반사율이 우수한 물질로 형성되어 빛의 외부 누설을 방지하고 빛을 상기 도광판 상면으로 반사시키는 반사층; 및 상기 확산판을 통해 확산되는 빛을 집광하여 출력하는 프리즘판을 포함하여 구성되는 것을 특징으로 한다.A backlight unit of the liquid crystal display device according to the present invention for achieving the above object, the light source; A lamp reflector surrounding the light source; A light guide plate for moving light generated from the light source; A diffuser plate formed on an upper surface of the light guide plate to diffuse diffusely reflected light; A reflection layer formed of a material having excellent reflectivity on the lower surface of the light guide plate to prevent external leakage of light and to reflect light to the upper surface of the light guide plate; And a prism plate for collecting and outputting light diffused through the diffusion plate.
상기 반사율이 우수한 물질은 은(Ag)과 알루미늄(Al) 중에서 어느 하나이고, 상기 반사층은 5 ~ 50 ㎛ 두께인 것을 특징으로 한다.The material having excellent reflectance is any one of silver (Ag) and aluminum (Al), and the reflective layer is characterized in that the thickness of 5 ~ 50 ㎛.
본 발명에 의하면, 도광판 하면에 매우 얇은 두께의 은이나 알루미늄층이 형성되어 있어서 반사판이 별도로 필요하지 않아 제품의 슬림화를 이룰 수 있으며,연한 재질의 반사판이 없으므로 열에 의한 주름 현상이 원천적으로 방지되어 화면의 균일성을 이룰 수 있다.According to the present invention, a very thin thickness of silver or aluminum layer is formed on the lower surface of the light guide plate, so that the reflection plate is not required separately, thereby making the product slimmer. Since there is no light reflection plate, wrinkles caused by heat are prevented at the source. Uniformity can be achieved.
이하, 본 발명에 따른 액정표시장치의 백라이트 유니트를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, a backlight unit of a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.
도 2는 본 발명에 따른 액정표시장치의 백라이트 유니트를 도시한 단면도이다.2 is a cross-sectional view illustrating a backlight unit of a liquid crystal display according to the present invention.
본 발명에 따른 액정표시장치의 백라이트 유니트는, 도 2에 도시된 바와 같이, 고전압의 펄스를 발생시키는 구동부(미도시)의 출력단에 연결되어 인가되는 펄스에 따라 방전하여 광을 발생시키는 냉음극선관이나 열음금선관과 같은 광원(200)과, 상기 광원(200)을 둘러싸고 있는 램프 반사체(220)와, 상기 광원(200)에서 발생되는 빛을 이동시키고 빛을 난반사시키는 도트 패턴(220)이 형성되어 있는 도광판(230)과, 상기 도광판(230)의 상면에 형성되어 난반사된 빛을 확산시키는 확산판(250)과, 상기 확산판(250)을 통해 확산되는 빛을 집광하여 출력하는 프리즘판(260)과, 상기 프리즘판(260)을 외부의 충격으로부터 보호하는 보호막(270)으로 구성된다.As shown in FIG. 2, the backlight unit of the liquid crystal display according to the present invention is connected to an output terminal of a driving unit (not shown) that generates a pulse of high voltage and discharges light according to an applied pulse to generate light. Or a light source 200, such as a hot and cold wire tube, a lamp reflector 220 surrounding the light source 200, and a dot pattern 220 for moving the light generated by the light source 200 and diffusely reflecting the light. A light guide plate 230, a diffuser plate 250 formed on an upper surface of the light guide plate 230 to diffuse diffusely reflected light, and a prism plate configured to collect and output light diffused through the diffuser plate 250. 260 and a protective film 270 that protects the prism plate 260 from external impact.
여기서, 상기 프리즘판(260)은 하부 프리즘판(261) 및 상부 프리즘판(262)으로 구성되어 있으며, 상기 보호막(270)은 본 발명의 필수 구성 요소인 것은 아니다.Here, the prism plate 260 is composed of a lower prism plate 261 and the upper prism plate 262, the protective film 270 is not an essential component of the present invention.
한편, 상기 도광판(230) 하면에는 은(Ag)이나 알루미늄(Al)과 같은 반사율이 우수한 물질로 형성되어 빛의 외부 누설을 방지하고 빛을 상기 도광판(230) 상면으로 반사시키는 반사층(240)이 약 5 ~ 50㎛ 정도의 두께로 형성되어 있다.On the other hand, the lower surface of the light guide plate 230 is formed of a material having excellent reflectivity such as silver (Ag) or aluminum (Al) to prevent the external leakage of light and reflect the light to the upper surface of the light guide plate 230 is It is formed in the thickness of about 5-50 micrometers.
그리고, 상기 각 구성요소들은 도면에는 도시하지 않았지만 몰드 프레임(Mold Frame)에 지지되어 있으며, 액정 패널과 광원간의 간격 유지를 위해 몰드 플레임은 액정 패널과 램프 반사체 사이에 부착되어 있다.Although not shown in the drawings, the components are supported by a mold frame, and a mold frame is attached between the liquid crystal panel and the lamp reflector to maintain the gap between the liquid crystal panel and the light source.
상기와 같은 구조로 된 액정표시장치의 백라이트 유니트는 다음과 같이 작동한다.The backlight unit of the LCD having the above structure operates as follows.
먼저, 상기 광원(200)으로부터 발생된 빛은 램프 반사체(210)에 의해 반사되어 도광판(230)으로 입사된다. 그리고, 입사된 빛은 도광판(230) 하면의 도트 패턴(220) 및 반사층(240)에 의하여 확산판(250) 및 프리즘판(260)을 통해 액정 패널(미도시)로 입사되어 소정의 화상이 형성된다.First, the light generated from the light source 200 is reflected by the lamp reflector 210 and is incident to the light guide plate 230. The incident light is incident on the liquid crystal panel (not shown) through the diffusion plate 250 and the prism plate 260 by the dot pattern 220 and the reflective layer 240 on the lower surface of the light guide plate 230, thereby providing a predetermined image. Is formed.
이때, 상기 도광판(230) 하부에는 반사층(240)이 형성되어 있으므로해서 외부로 빛이 누설되는 것을 완전히 차단한다. 또한, 상기 반사층(240)은 반사율이 우수한 은이나 알루미늄으로 구성되어 있기 때문에 화면의 휘도가 향상된다.In this case, since the reflective layer 240 is formed under the light guide plate 230, the leakage of light to the outside is completely blocked. In addition, since the reflective layer 240 is made of silver or aluminum having excellent reflectance, the brightness of the screen is improved.
본 발명의 원리와 정신에 위배되지 않는 범위에서 여러 실시예는 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 자명할 뿐만 아니라 용이하게 실시할 수 있다. 따라서, 본원에 첨부된 특허청구범위는 이미 상술된 것에 한정되지 않으며, 하기 특허청구범위는 당해 발명에 내재되어 있는 특허성 있는 신규한 모든 사항을 포함하며, 아울러 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해서 균등하게 처리되는 모든 특징을 포함한다.Various embodiments can be easily implemented as well as self-explanatory to those skilled in the art without departing from the principles and spirit of the present invention. Accordingly, the claims appended hereto are not limited to those already described above, and the following claims are intended to cover all of the novel and patented matters inherent in the invention, and are also common in the art to which the invention pertains. Includes all features that are processed evenly by the knowledgeable.
이상에서 설명한 바와 같이, 본 발명에 따른 액정표시장치의 백라이트 유니트에 있어서는 다음과 같은 효과가 있다.As described above, the backlight unit of the liquid crystal display according to the present invention has the following effects.
본 발명에 있어서는, 도광판 하면에 매우 얇은 두께의 은이나 알루미늄층이 형성되어 있어서 반사판이 별도로 필요하지 않아 제품의 슬림화를 이룰 수 있으며, 연한 재질의 반사판이 없으므로 열에 의한 주름 현상이 원천적으로 방지되어 화면의 균일성을 이룰 수 있는 효과가 있다.In the present invention, a very thin silver or aluminum layer is formed on the lower surface of the light guide plate, so that the reflective plate is not required separately, thereby making the product slimmer. Since there is no soft reflective plate, wrinkles caused by heat are prevented at the source. There is an effect that can achieve a uniformity of.
또한, 기존의 PET로 된 반사판보다 반사율이 좋은 은이나 알루미늄층이 형성되어 있으므로 휘도가 향상되는 효과가 있다.In addition, since a silver or aluminum layer having a better reflectance than that of the conventional PET reflector is formed, luminance is improved.
Claims (3)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020020046035A KR20040013206A (en) | 2002-08-05 | 2002-08-05 | Backlight unit of liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020020046035A KR20040013206A (en) | 2002-08-05 | 2002-08-05 | Backlight unit of liquid crystal display device |
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| KR20040013206A true KR20040013206A (en) | 2004-02-14 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08262235A (en) * | 1995-03-22 | 1996-10-11 | Casio Comput Co Ltd | Illumination device |
| JPH09102209A (en) * | 1995-08-03 | 1997-04-15 | Nitto Denko Corp | Light guide panel, surface light source device, polarized light source device, and liquid-crystal display device |
| KR0169382B1 (en) * | 1995-05-31 | 1999-03-20 | 김광호 | Back-lighting device for liquid crystal display |
| KR19990069948A (en) * | 1998-02-16 | 1999-09-06 | 윤종용 | LCD backlight |
| KR20010062374A (en) * | 1999-12-13 | 2001-07-07 | 가마이 고로 | Light pipe, plane light source unit and liquid-crystal display device |
| KR20020075064A (en) * | 2001-03-23 | 2002-10-04 | 삼성전자 주식회사 | Back light having a reflector for increasing brightness |
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2002
- 2002-08-05 KR KR1020020046035A patent/KR20040013206A/en not_active Application Discontinuation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08262235A (en) * | 1995-03-22 | 1996-10-11 | Casio Comput Co Ltd | Illumination device |
| KR0169382B1 (en) * | 1995-05-31 | 1999-03-20 | 김광호 | Back-lighting device for liquid crystal display |
| JPH09102209A (en) * | 1995-08-03 | 1997-04-15 | Nitto Denko Corp | Light guide panel, surface light source device, polarized light source device, and liquid-crystal display device |
| KR19990069948A (en) * | 1998-02-16 | 1999-09-06 | 윤종용 | LCD backlight |
| KR20010062374A (en) * | 1999-12-13 | 2001-07-07 | 가마이 고로 | Light pipe, plane light source unit and liquid-crystal display device |
| KR20020075064A (en) * | 2001-03-23 | 2002-10-04 | 삼성전자 주식회사 | Back light having a reflector for increasing brightness |
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