KR100475699B1 - Producing method of the backlight for liquid crystal display - Google Patents

Producing method of the backlight for liquid crystal display Download PDF

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Publication number
KR100475699B1
KR100475699B1 KR10-2000-0069893A KR20000069893A KR100475699B1 KR 100475699 B1 KR100475699 B1 KR 100475699B1 KR 20000069893 A KR20000069893 A KR 20000069893A KR 100475699 B1 KR100475699 B1 KR 100475699B1
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liquid crystal
backlight
carbon nanotubes
crystal display
layer
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KR10-2000-0069893A
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Korean (ko)
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KR20020039998A (en
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문성주
김순식
박재영
박영돈
오영
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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
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/20—Carbon compounds, e.g. carbon nanotubes or fullerenes
    • H10K85/221—Carbon nanotubes

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 탄소나노튜브층이 차례로 형성된 하부기판이 스페이서를 사이에 두고 접합밀봉 하고, 상기 하부기판에 방전개스를 주입한 후 밀봉되는 진공배기 유리관을 배설하는 것을 특징으로 한 액정표시장치용 백라이트의 제조방법을 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 formed in turn, and a lower substrate in which a metal thin film layer and a carbon nanotube layer are formed in turn are bonded and sealed between spacers. Disclosed is a method of manufacturing a backlight for a liquid crystal display device, comprising disposing a vacuum exhaust glass tube sealed after injecting a discharge gas into the lower substrate.

Description

액정 표시장치용 백라이트 제조방법{Producing method of the backlight for liquid crystal display} Producing method of the backlight for liquid crystal display}

본 발명은 퍼스널 컴퓨터의 액정 디스플레이 또는 액정 텔레비젼 장치 등에 사용되는 액정표시장치용 백라이트의 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing 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 향상키도록 하는 구성으로 되어 있다. 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.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 distributed evenly, 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. 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)의 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, the object of the present invention is to form a monomolecular film of carbon nanotubes (Carbon nanotube) on the plane instead of the conventional complex backlight and uniform high brightness through this monolayer 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 발명은 상부기판 하부에 ITO층과 형광체층을 차례로 형성시키고, 하부기판 상부에 금속박막층과 탄소나노튜브층을 차례로 형성시킨 후, 이들을 스페이서를 사이에 두고 접합밀봉하고, 상기 하부기판에 방전개스를 주입한 후 밀봉되는 진공배기 유리관을 배설하여 백라이트를 제조함에 있어서, 탄소나노층 형성방법으로 아크방전으로 합성된 탄소나노튜브를 황산과 질산의 혼합물 속에서 산화시키면서 초음파 진동을 통해 탄소나노튜브의 말단을 카르복실 그룹으로 치환하여 짧은 탄소나노튜브를 얻고 증류수로 세척한 다음 BH3-THF를 이용하여 OH기로 환원시킨 후 SOCl2를 -Cl로 치환하고, 다시 KSH를 이용해 말단을 -SH기로 개질시킨 후 금속박막층에 자기조립시켜 단분자막을 형성하는 방법을 사용하는 것을 특징으로 한 백라이트 제조법을 개시한다.In order to achieve the above object, the present invention forms an ITO layer and a phosphor layer in the lower portion of the upper substrate in turn, and a metal thin film layer and a carbon nanotube layer are formed in turn on the lower substrate, and then bonded and sealed with spacers therebetween. In preparing a backlight by disposing a vacuum exhaust glass tube sealed after injecting a discharge gas into the lower substrate, ultrasonic waves are oxidized in a mixture of sulfuric acid and nitric acid by oxidizing carbon nanotubes synthesized by arc discharge by a carbon nanolayer forming method. By vibrating, the end of the carbon nanotubes were replaced with carboxyl groups to obtain short carbon nanotubes, washed with distilled water, reduced to OH with BH 3 -THF, and then SOCl 2 was substituted with -Cl, and KSH was again substituted. Using a method of forming a monomolecular film by modifying the terminal with -SH group and then self-assembling the metal thin film layer. It discloses a backlight recipe.

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 스페이스(spacer)(5)를 사이에 두고 접합밀봉되어 있으며, 상기 하부기판(7)에는 방전개스를 주입한 후 가열 밀봉되는 진공배기 유리관(8)이 설치되어 있는 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 the lower substrate 7 on which the metal thin film layer 6 such as gold foil and the carbon nanotube layer 4 on which the carbon nanotube molecular film is formed are sequentially stacked are interposed between the spaces 5. It relates to a backlight for a liquid crystal display device having a structure in which a vacuum-exhaust glass tube 8 is heat-sealed after injecting a discharge gas into the lower substrate 7. 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 다음과 같은 방법에 의해 얻어지는 티올 유도체로 치환된 탄소나노튜브를 사용한다.In the present invention, as the carbon nanotubes used when forming the carbon nanotube layer on the metal thin film layer 6 formed on the lower substrate, carbon nanotubes substituted with thiol derivatives obtained by the following method are used.

즉, 아크방전으로 합성된 탄소나노튜브를 황산과 질산의 혼합물 속에서 산화시켜면서 초음파 진동을 통해 탄소나노튜브의 말단을 카르복실 그룹으로 치환하여 짧은 탄소나노튜브를 얻고 증류수로 세척한 다음 BH3-THF를 이용해 OH기로 환원시킨 후 SOCl2를 이용해 -Cl로 치환하고, 다시 KSH를 이용해 말단을 -SH기로 개질시킨 후, 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)하며, 도 2와 같은 형상으로 단분자막인 탄소나노튜브층(4)이 형성된다.That is, one by while oxidizing the carbon nanotubes by arc discharge in a mixture of sulfuric acid and nitric acid with an ultrasonic vibration substitution the ends of the carbon nanotubes with carboxyl groups to obtain the short carbon nanotubes, washed with distilled water and then BH 3 After reducing to OH group using -THF and substituting with -Cl using SOCl 2 , and modifying the terminal to -SH group using KSH, the carbon nanotubes substituted with the thiol derivative thus obtained are dispersed in ethanol and then gold When the lower substrate 7 on which the metal thin film layer 6, which is thinned with Au, is formed, is immersed in the solution and taken out, the carbon nanotubes are self-assembly, and carbon as a monomolecular film as shown in FIG. The nanotube layer 4 is formed.

이때 탄소나노튜브는 단층(single-wall)나노튜브 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 can be used as single-wall nanotubes or multi-wall nanotubes, and the length of the tube is in the range of about 0.1 to 10 μm and the diameter of the tube is in the range of about 10 to 200 nm. desirable.

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 할 수 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 luminance can be obtained.

도 1은 본 발명의 실시 양태를 도시한 단면도1 is a cross-sectional view showing an embodiment of the present invention.

도 2는 하부기판의 금속박막층과 -SH로 말단이 개질된 탄소나노튜브의 화학적 결합을 보여주는 단면도Figure 2 is a cross-sectional view showing the chemical bonding of the metal thin film layer of the lower substrate and the carbon nanotubes whose ends are modified with -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 (1)

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 형성되는 액정표시장치용 백라이트를 제조하는 방법에 있어서,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. In the method for manufacturing a backlight for a liquid crystal display device wherein the carbon nanotube layer 4 is formed using carbon nanotubes substituted with thiol derivatives, 상기 티올 유도체로 치환된 탄소나노튜브를 사용해 상기 탄소나노튜브층을 형성하되, 아크방전으로 합성된 탄소나노튜브를 황산과 질산의 혼합물 속에서 산화시키는 과정; 초음파 진동을 통해 상기 탄소나노튜브의 말단을 카르복실 그룹으로 치환하여 짧은 탄소나노튜브를 얻는 과정; 상기 짧은 탄소나노튜브를 증류수로 세척한 다음 BH3-THF를 이용해 OH기로 환원시키는 과정; 상기 환원 과정 후 SOCl2를 이용해 -Cl로 치환하고 다시 KSH를 이용해 말단을 -SH기로 개질시키는 과정을 통해, 상기 금속박막층에 자기조립시켜 단분자막을 형성시키는 방법을 사용하는 것을 특징으로 하는 액정표시장치용 백라이트 제조방법.Forming a carbon nanotube layer using carbon nanotubes substituted with the thiol derivatives, and oxidizing the carbon nanotubes synthesized by arc discharge in a mixture of sulfuric acid and nitric acid; Obtaining short carbon nanotubes by replacing the ends of the carbon nanotubes with carboxyl groups through ultrasonic vibration; Washing the short carbon nanotubes with distilled water and then reducing the OH group with BH 3 -THF; After the reduction process, by substituting -Cl with SOCl 2 and modifying the terminal with -SH again with KSH, the liquid crystal display device using a method of forming a monomolecular film by self-assembling to the metal thin film layer. Backlight manufacturing method.
KR10-2000-0069893A 2000-11-23 2000-11-23 Producing method of the backlight for liquid crystal display KR100475699B1 (en)

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