KR100474171B1 - Backlight for liquid crystal display - Google Patents

Backlight for liquid crystal display Download PDF

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Publication number
KR100474171B1
KR100474171B1 KR10-2000-0064209A KR20000064209A KR100474171B1 KR 100474171 B1 KR100474171 B1 KR 100474171B1 KR 20000064209 A KR20000064209 A KR 20000064209A KR 100474171 B1 KR100474171 B1 KR 100474171B1
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South Korea
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liquid crystal
backlight
crystal display
layer
display device
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KR10-2000-0064209A
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Korean (ko)
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KR20020033947A (en
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오영
김순식
박재영
박영돈
문성주
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주식회사 새 한
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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
    • 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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
    • H10K30/80—Constructional details
    • H10K30/81—Electrodes
    • H10K30/82—Transparent electrodes, e.g. indium tin oxide [ITO] electrodes
    • H10K30/821—Transparent electrodes, e.g. indium tin oxide [ITO] electrodes comprising carbon nanotubes
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

본 발명은 퍼스널 컴퓨터의 액정 디스플레이 또는 액정 텔레비젼 장치등에 사용되는 액정표시장치용 백라이트에 관한 것으로서, 기존의 백라이트에 비해 제조공정의 단순화와 제조비용의 절감을 도모하고 빛의 광투과율 향상 및 고휘도를 얻는 것을 발명의 목적으로 하여 안출된 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight for a liquid crystal display device used in a liquid crystal display or a liquid crystal television device of a personal computer. The present invention aims to simplify the manufacturing process and reduce manufacturing cost, and to improve light transmittance and high brightness of a light source, compared to a conventional backlight. It is devised for the purpose of this invention.

본 발명은 상기와 같은 목적을 달성하기 위해, 하부에 ITO층과 형광체층이 차례로 형성된 상부기판과, 상부에 금속박막층과 탄소나노투브층이 차례로 형성된 하부기판이 스페이서를 사이에 두고 접합밀봉되어 있고, 상기 하부기판에는 방전개스를 주입한 후 밀봉되는 진공배기 유리관이 배설되어 있는 구조로 된 액정표시장치용 백라이트를 개시한다.In order to achieve the above object, the present invention provides an upper substrate in which an ITO layer and a phosphor layer are sequentially formed, and a lower substrate in which a metal thin film layer and a carbon nanotube layer are sequentially formed is bonded and sealed between spacers. A backlight for a liquid crystal display device having a structure in which a vacuum exhaust glass tube that is sealed after injecting a discharge gas into the lower substrate is disposed.

Description

액정 표시장치용 백라이트{Backlight for liquid crystal display} Backlight for liquid crystal display

본 발명은 퍼스널 컴퓨터의 액정 디스플레이 또는 액정 텔레비젼 장치 등에 사용되는 액정표시장치용 백라이트에 관한 것이다.TECHNICAL FIELD The present invention relates to a backlight for a liquid crystal display device used for a liquid crystal display or a liquid crystal television device of a personal computer.

일반적으로 액정표시소자는 무게가 가볍고 소비전력도 적다는 장점을 가지고 있어서, 컴퓨터 또는 텔레비젼 분야의 디스플레이장치에 널리 보급되고 있다. 그러나, 액정표시소자는 그 자체가 발광하여 화상을 형성하지 못하고 후방에서 균일한 빛을 받아야만 화상을 형성하므로 후방에서 빛을 발산하는 요소가 필요한데, 백라이트는 이러한 역할을 수행하는 액정 디스플레이 장치의 중요한 구성요소이다.In general, liquid crystal display devices have the advantages of low weight and low power consumption, and thus are widely used in display devices in the computer or television fields. However, since the liquid crystal display itself does not form an image by emitting light, but needs to receive uniform light from the rear to form an image, an element that emits light from the rear is required, and the backlight is an important component of the liquid crystal display device that performs this role. Element.

도 3은 일본국 특허공개공보 평 8-313710호, 일본국 특허공개공보 평9-251807호에 도시된 종래의 에지 라이트 방식의 백라이트 구조를 보여주는 단면도로서, 발광체는 냉음극 형광관(16)으로 액정표시장치(11) 끝면 하단에 배치되고, 여기서 나온 빛은 반사판(15)에 의하여 액정판 하단으로 전달되며, 투과상 재료로 이루어지는 도광판(14)의 상면에 조명면의 빛을 액정판 전체에 골고루 분산하여 보내는 확산판(13)이 있으며, 확산판(13) 상부에 위치한 프리즘판(12)에 의하여 빛을 어느 정도 집합하고 액정판의 정면 휘도를 향상시키도록 하는 구성으로 되어 있다.3 is a cross-sectional view showing a conventional edge light backlight structure shown in Japanese Patent Application Laid-open No. Hei 8-313710 and Japanese Patent Laid-Open No. Hei 9-251807, wherein the light emitter is a cold cathode fluorescent tube 16; It is disposed at the lower end of the end surface of the liquid crystal display device 11, and the light emitted therefrom is transmitted to the lower end of the liquid crystal plate by the reflecting plate 15, and the light of the illumination surface is applied to the entire liquid crystal plate on the upper surface of the light guide plate 14 made of a transmission phase material. There is a diffuser plate 13 which is evenly distributed and distributed, and the prism plate 12 located above the diffuser plate 13 collects light to some extent and improves the front luminance of the liquid crystal plate.

삭제delete

그러나, 이상과 같이 구성된 종래의 백라이트는 일반적으로 구성이 복잡하여 생산비가 높아질 뿐만 아니라 광원이 측면에 있어서 빛의 반사와 투과에 의하여 소비 전력에 대한 효율이 현저하게 낮아지고 휘도의 균일성을 보장하기 어렵다는 문제점이 있었다.However, the conventional backlight structure as described above is generally complicated in composition, not only to increase the production cost but also to considerably lower the efficiency of power consumption due to the reflection and transmission of light at the side of the light source, and to ensure uniformity of luminance. There was a difficult problem.

본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위한 것으로써, 본 발명의 목적은 기존의 복잡한 백라이트 대신 평면상에 탄소나노튜브(carbon nano tube)에 단분자막을 형성하고 이 단분자막을 통해 균일한 고휘도의 백라이트를 제조하는데 있다. 본 발명의 또다른 목적은 탄소나노튜브를 이용함으로써, 기존의 것보다 단순한 구성으로 제작이 가능하여 생산비와 소비전력을 감소시키는 이점을 지닌 백라이트 제조 방법을 제공하는데 있다. The present invention is to solve the problems of the prior art as described above, an object of the present invention is to form a monomolecular film on the carbon nanotube (carbon nanotube) on the plane instead of the conventional complex backlight and uniform high brightness through the monomolecular film To manufacture the backlight. Another object of the present invention to provide a backlight manufacturing method having the advantage of reducing the production cost and power consumption can be manufactured in a simpler configuration than conventional by using carbon nanotubes.

상기 목적을 달성하기 위하여, 본 발면의 액정표시장치는 측면에 위치했던 광원 대신에 평면상에 탄소나노튜브를 자기조립시키고 균일하게 배열한 후 빛을 발산하는 새로운 형태의 백라이트를 개시한다.In order to achieve the above object, the liquid crystal display device of the present invention discloses a new type of backlight that emits light after self-assembling and uniformly arranging carbon nanotubes on a plane instead of a light source located on the side.

이하, 첨부된 도면에 의거 본 발명을 구체적으로 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 백라이트의 구체적인 구조를 나타낸 단면도로서, 즉 본 발명은 하부에 ITO(Indium Tin Oxide)층(2)과 형광체가 도포되어 있는 형광체층(3)이 차례로 적층되어 있는 상부기판(1)과, 상부에 금박과 같은 금속박막층(6)과 탄소나노튜브 분자막이 형성된 탄소나노튜브층(4)이 차례로 적층되어 있는 하부기판(7)이 스페이서(spacer)(5)를 사이에 두고 접합밀봉되어 있으며, 상기 하부기판(7)에는 방전개스를 주입한 후 가열 밀봉되는 진공배기 유리관(8)이 설치되어 구조로 된 액정표시장치용 백라이트에 관한 것이다. 이와 같이 구성된 백라이트는 상부기판과 하부기판에 배설된 전극에 전압을 인가하면 탄소나노튜브에서 방출된 전자가 형광체를 통과하면서 빛을 발산하게 된다.1 is a cross-sectional view showing a specific structure of a backlight according to the present invention, that is, the present invention is an upper substrate on which an indium tin oxide (ITO) layer 2 and a phosphor layer 3 on which phosphors are applied are sequentially stacked. (1) and a lower substrate 7 on which a metal thin film layer 6 such as gold foil and a carbon nanotube layer 4 on which a carbon nanotube molecular film is formed are sequentially stacked are interposed between spacers 5. The lower substrate 7 is bonded and sealed, and the lower substrate 7 relates to a backlight for a liquid crystal display device having a vacuum exhaust glass tube 8 which is heat sealed after injecting a discharge gas. In the backlight configured as described above, when voltage is applied to the electrodes disposed on the upper and lower substrates, electrons emitted from the carbon nanotubes pass through the phosphor and emit light.

본 발명에서 하부기판에 형성된 금속박막층(6)상에 탄소나노튜브층을 형성시 사용되는 탄소나노튜브로는 티올 유도체로 치환된 탄소나노튜브를 사용하는 것이 바람직하며, 구체적으로 다음과 같은 랑뮤어(Langmuir)방법을 사용하여 형성될 수 있다.In the present invention, it is preferable to use carbon nanotubes substituted with thiol derivatives as the carbon nanotubes used when forming the carbon nanotube layer on the metal thin film layer 6 formed on the lower substrate. It can be formed using the (Langmuir) method.

즉, 아크방전으로 합성된 탄소나노튜브를 황산과 질산의 혼합물 속에서 산화시키면서 초음파 진동을 통해 탄소나노튜브의 말단을 카르복실 그룹으로 치환하여 짧은 탄소나노튜브를 얻고 증류수로 세척한 다음 이를 다이클로로헥실카르보 디이미드 및 화합물 NH2-(CH2)2-SH와 함께 에탄올 속에서 반응시켜 티올(Thiol)(-SH)유도체로 치환된 탄소나노튜브를 얻으며, 이와 같이 얻어진 티올 유도체로 치환된 탄소나노튜브를 에탄올에 분산시킨 후 금(Au)으로 박막 처리된 금속박막층(6)이 형성된 하부기판(7)을 상기 용액에 담그었다가 꺼내면 자연스럽게 탄소나노튜브들이 자기조립(Self-asembly)하여, 도 2와 같은 형상으로 단분자막인 탄소나노튜브층(4)이 형성된다.That is, the carbon nanotubes synthesized by arc discharge are oxidized in a mixture of sulfuric acid and nitric acid, and the ends of the carbon nanotubes are replaced with carboxyl groups by ultrasonic vibration to obtain short carbon nanotubes, and then washed with distilled water. Reaction with hexylcarbodiimide and the compound NH 2- (CH 2 ) 2 -SH in ethanol yields a carbon nanotube substituted with thiol (-SH) derivative, and is substituted with the thiol derivative thus obtained. After dispersing the carbon nanotubes in ethanol, the lower substrate 7 having the metal thin film layer 6 treated with gold (Au) is immersed in the solution and taken out, and the carbon nanotubes are self-assembly naturally. 2, a carbon nanotube layer 4, which is a monomolecular film, is formed.

이때 탄소나노튜브는 단층(single-wall) 또는 다층(multi-wall) 나노튜브가 모두 사용가능하며, 튜브의 길이는 대략 0.1∼10㎛ 튜브의 지름은 대략 10∼200nm 범위에 있는 것이 바람직하다.In this case, carbon nanotubes may be used as single-wall or multi-wall nanotubes, and the length of the tube is preferably about 0.1 to 10 μm and the diameter of the tube is about 10 to 200 nm.

본 발명에 사용되는 상부기판(1) 또는 하부기판(7)은 일반적으로 유리기판, 플라스틱기판 등을 사용하며, 또 하부기판(7)에 형성되는 금속박막층(6)은 대개 금속 또는 금속산화물을 사용하여 형성되며, 그 두께는 대략 0.1nm∼1㎛범위가 적당하다.The upper substrate 1 or the lower substrate 7 used in the present invention generally uses a glass substrate, a plastic substrate, and the like, and the metal thin film layer 6 formed on the lower substrate 7 usually has a metal or metal oxide. It is formed using, and the thickness is suitably in the range of about 0.1 nm to 1 탆.

이상과 같이 구성된 액정표시장치용 백라이트는 탄소나노튜브를 평면상에 배치하여 균일한 빛을 직접 발산하므로, 기존의 백라이트에 사용되는 다수의 부품들(예를 들면 광원, 도광판, 광확산판, 프리즘판, 반사판)을 사용하지 않아 공정의 단순화와 제조 비용의 절감을 도모 할수 있으며, 또한 단순한 구성으로 인해 빛의 광 투과율 향상과 상대적으로 고휘도를 얻을 수 있다.Since the backlight for the liquid crystal display device configured as described above emits uniform light directly by arranging carbon nanotubes on a plane, a plurality of components (for example, a light source, a light guide plate, a light diffusion plate, and a prism) used in the conventional backlight are used. It is possible to simplify the process and reduce the manufacturing cost by not using a plate or a reflector plate. Also, due to the simple configuration, light transmittance of light and relatively high brightness can be obtained.

도 1은 본 발명의 실시 양태를 도시한 단면도.1 is a cross-sectional view showing an embodiment of the present invention.

도 2는 하부기판의 금속박막층과 -SH로 말단이 개질된 탄소나노튜브의 화학적 결합을 보여주는 단면도.Figure 2 is a cross-sectional view showing the chemical bonding of the metal thin film layer of the lower substrate and the carbon nanotube-modified end of -SH.

도 3은 종래의 액정표시장치에 사용된 백라이트의 일례를 나타내는 단면도이다.3 is a cross-sectional view showing an example of a backlight used in a conventional liquid crystal display device.

〈도면의 주요 부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

1 : 상부 기판 2 : ITO층1: upper substrate 2: ITO layer

3 : 형광체층 4 : 탄소나노튜브층3: phosphor layer 4: carbon nanotube layer

5 : 스페이서 6 : 금속박막층5 spacer 6 metal thin film layer

7 : 하부 기관 8 : 진공배기 유리관7: lower body 8: vacuum exhaust glass tube

11 : 액정 표시 장치 12 : 프리즘판11: liquid crystal display device 12: prism plate

13 : 확산판 14 : 도광판13 diffuser 14 light guide plate

15 : 반사판 16 : 냉음극 형광판15: reflecting plate 16: cold cathode fluorescent plate

Claims (3)

액정표시장치용 백라이트에 있어서,In the backlight for a liquid crystal display device, 하부에 ITO층(2)과 형광체층(3)이 차례로 적층되어 있는 상부기판(1)과, 상부에 금속박막층(6)과 탄소나노튜브층(4)이 차례로 적층되어 있는 하부기판(7)을 포함하며, 상기 상부기판(1) 및 하부기판(7)은 스페이서(5)를 사이에 두고 접합 밀봉되어 있고, 상기 하부기판(7)에는 방전 개스를 주입한 후 밀봉되는 진공배기 유리관(8)이 배설되어 있고, 상기 탄소나노튜브층(4)은 티올 유도체로 치환된 탄소나노튜브를 사용해 형성된 액정표시장치용 백라이트.An upper substrate 1 on which an ITO layer 2 and a phosphor layer 3 are sequentially stacked, and a lower substrate 7 on which a metal thin film layer 6 and a carbon nanotube layer 4 are sequentially stacked. The upper substrate 1 and the lower substrate 7 are bonded and sealed with a spacer 5 interposed therebetween, and the lower substrate 7 is sealed after injecting a discharge gas into the vacuum exhaust glass tube 8. ) And the carbon nanotube layer (4) is formed using carbon nanotubes substituted with thiol derivatives. 제 1항에 있어서, 탄소나노튜브층(4)은 길이가 0.1∼10㎛, 지름이 10∼20nm인 탄소나노튜브를 사용해 형성된 것인 액정표시장치용 백라이트.The backlight for a liquid crystal display device according to claim 1, wherein the carbon nanotube layer (4) is formed using carbon nanotubes having a length of 0.1 to 10 탆 and a diameter of 10 to 20 nm. 제1 항 및 제 2항에 있어서, 탄소나노튜브층(4)은 단층 또는 다층구조로 된 것인 액정표시장치용 백라이트.The backlight for a liquid crystal display device according to claim 1 or 2, wherein the carbon nanotube layer (4) has a single layer or a multilayer structure.
KR10-2000-0064209A 2000-10-31 2000-10-31 Backlight for liquid crystal display KR100474171B1 (en)

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KR100522684B1 (en) * 2000-11-11 2005-10-19 삼성에스디아이 주식회사 Flat display device comprising material layers for electron amplification having carbon nanotube layer and method for manufacturing the same
KR20020054877A (en) * 2000-12-28 2002-07-08 한형수 Electric field emission material using carbon nano tubes
KR100842934B1 (en) * 2002-04-12 2008-07-02 나노퍼시픽(주) Backlight for Liquid Crystal Displays

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