KR100815056B1 - Lcd with a fluorescence film - Google Patents

Lcd with a fluorescence film Download PDF

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KR100815056B1
KR100815056B1 KR1020070001782A KR20070001782A KR100815056B1 KR 100815056 B1 KR100815056 B1 KR 100815056B1 KR 1020070001782 A KR1020070001782 A KR 1020070001782A KR 20070001782 A KR20070001782 A KR 20070001782A KR 100815056 B1 KR100815056 B1 KR 100815056B1
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fluorescent film
substrate
liquid crystal
backlight unit
lcd panel
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KR1020070001782A
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Korean (ko)
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김기용
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주식회사 대우일렉트로닉스
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/305—Flat vessels or containers
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/046—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using capacitive means around the vessel

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

An LCD device with a fluorescent film is provided to form a surface light source through the fluorescent film coated on the rear of an LCD panel at a predetermined thickness, thereby providing higher luminance uniformity, and reducing assembly processes and reducing production costs by excluding a separate diffusion plate. An LCD(Liquid Crystal Display) device with a fluorescent film(20) comprises a backlight unit(10), a fluorescent film, and an LCD panel(30). The backlight unit emits ultraviolet rays. The fluorescent film converts the ultraviolet rays emitted from the backlight unit into a visible ray. The fluorescent film is compactly coated over the total LCD panel.

Description

형광막이 포함된 액정표시장치{LCD WITH A FLUORESCENCE FILM}Liquid Crystal Display with Fluorescent Film {LCD WITH A FLUORESCENCE FILM}

도 1은 종래의 기술에 의한 액정표시장치의 측면도.1 is a side view of a liquid crystal display device according to the related art.

도 2는 본 발명의 실시예에 따른 액정표시장치의 측면도.2 is a side view of a liquid crystal display according to an exemplary embodiment of the present invention.

※도면의 주요 부분에 대한 부호의 설명※※ Explanation of code for main part of drawing ※

10 : 백라이트 유닛 20 : 형광막10 backlight unit 20 fluorescent film

30 : LCD 패널 31 : 제1 기판30 LCD panel 31 first substrate

32 : 액정층 33 : 제2 기판32: liquid crystal layer 33: second substrate

본 발명은 디스플레이 장치에 사용되는 액정표시장치(LCD)에 관한 것으로서, 특히 백라이트 유닛에 포함되었던 형광물질을 LCD 패널에 형성시켜 면광원을 구현할 수 있는 액정표시장치에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (LCD) used in a display device, and more particularly, to a liquid crystal display device that can realize a surface light source by forming a fluorescent material included in a backlight unit on an LCD panel.

디스플레이 장치는 방송국과 같은 외부소스로부터 수신한 신호를 영상 및 음 향 신호로 처리하여 출력하는 전자기기이다. 일반적인 TV가 포함되는데, 현재에는 액정표시장치(LCD)를 이용한 디스플레이 장치가 상용화되었다.The display device is an electronic device that processes and outputs a signal received from an external source such as a broadcasting station into an image and sound signal. A general TV is included, and a display device using a liquid crystal display (LCD) has been commercialized.

액정표시장치는, 이방성 유전율, 이방성 굴절률 등과 같은 광학적, 전기적 특성을 갖는 액정을 이용하므로, 얇고 가벼우며 저전력으로도 구동될 수 있어 영상을 표시하는 대부분의 장치에서 활용되고 있다.Since the liquid crystal display uses a liquid crystal having optical and electrical characteristics such as anisotropic dielectric constant and anisotropic refractive index, the liquid crystal display device is thin, light, and can be driven at low power, thereby being used in most devices for displaying an image.

다만 이와 같은 액정은 스스로 발광하지 못하는 비발광성 소자이므로 별도의 광원을 구비해야만 한다. 도 1을 참조하면, 종래의 기술에 따른 액정표시장치는, 액정을 포함하는 LCD 패널(3)과 LCD 패널(3)에 빛을 공급하는 백라이트 유닛(1) 및 백라이트 유닛(1)에서 공급되는 광의 휘도 균일성을 향상시키는 확산판(2)이 포함된다. However, since the liquid crystal is a non-light emitting device that does not emit light by itself, it must have a separate light source. Referring to FIG. 1, a liquid crystal display according to the related art is provided by an LCD panel 3 including a liquid crystal, a backlight unit 1 supplying light to the LCD panel 3, and a backlight unit 1. A diffuser plate 2 for improving the brightness uniformity of light is included.

종래의 기술에서는 백라이트 유닛(1)으로서 선 광원 방식의 형광램프(CCFL)나 점 광원 방식의 발광 다이오드(LED)를 사용했으나, 휘도 균일성을 확보하기가 어려운 문제점이 있었다. 이를 해결하기 위해 면광원을 이용하는 방법이 제시되었으나, 기존의 선 광원 방식의 형광램프(CCFL)를 복수로 적층시켜 형성된 백라이트 유닛을 이용한 것이어서 실질적으로 종래의 선 광원 방식보다 효율적이라고 보기 어렵다. 또한 이와 같은 형광램프를 이용하는 방식은 복잡한 구성을 필요로 하므로 제조가 어렵고 고비용이 초래된다. 더욱이 휘도 균일성을 확보하기 위한 확산판(2)은 소정의 두께를 갖는 투명한 재질의 평판으로서 확산제를 포함하는데 이 또한 액정표시장치의 생산비용증가와 조립공정의 지연에 영향을 미치게 된다. In the prior art, although the fluorescent lamp (CCFL) of the line light source type or the light emitting diode (LED) of the point light source type was used as the backlight unit 1, there was a problem that it was difficult to secure the uniformity of luminance. In order to solve this problem, a method of using a surface light source has been proposed. However, since the backlight unit formed by stacking a plurality of conventional fluorescent lamps (CCFLs) of a linear light source method is used, it is difficult to be considered as more efficient than the conventional linear light source method. In addition, the method using such a fluorescent lamp requires a complicated configuration, which makes manufacturing difficult and expensive. In addition, the diffusion plate 2 for securing luminance uniformity includes a diffusing agent as a flat plate having a predetermined thickness, which also affects the increase in the production cost of the liquid crystal display and the delay of the assembly process.

본 발명은 상기와 같은 점을 감안하여 안출된 것으로서, LCD 패널에 포함되는 얇은 층의 형광막을 통해 충분한 휘도 균일성을 확보할 수 있으므로 확산판이 필요 없으며, 제조가 쉽고 생산 비용이 저렴한 액정표시장치를 제공하는 것을 목적으로 한다. The present invention has been made in view of the above, and since a sufficient luminance uniformity can be secured through a thin layer of a fluorescent film included in an LCD panel, a diffusion plate is not required, and a liquid crystal display device which is easy to manufacture and inexpensive to produce is provided. It aims to provide.

상기와 같은 목적을 달성하기 위해 제공되는 본 발명의 실시예에 따른 형광막이 포함된 액정표시장치는, 자외선을 방출하는 백라이트 유닛; 상기 백라이트 유닛에서 방출되는 자외선을 가시광선으로 변환시키는 형광막; 및, 상기 형광막이 형성되는 LCD 패널;을 포함하는 것을 특징으로 한다.In order to achieve the above object, a liquid crystal display including a fluorescent film according to an embodiment of the present invention, the backlight unit for emitting ultraviolet light; A fluorescent film converting ultraviolet rays emitted from the backlight unit into visible light; And an LCD panel on which the fluorescent film is formed.

상기 LCD 패널은, 제1 기판;과 상기 제1 기판과 일정 간격으로 이격되어 평행하게 대면하는 제2 기판; 및 상기 제1 기판과 제2 기판 사이에 충전되는 액정층;을 포함하며, 상기 형광막은 상기 제1 기판이 상기 제2 기판을 대면하는 면의 반대면으로서 상기 제1 기판의 후면에 형성되는 것이 바람직하다.The LCD panel may include: a first substrate; a second substrate spaced apart from the first substrate at a predetermined interval and facing in parallel; And a liquid crystal layer filled between the first substrate and the second substrate, wherein the fluorescent film is formed on a rear surface of the first substrate as an opposite surface of the surface on which the first substrate faces the second substrate. desirable.

더욱이 상기 형광막은, 상기 제1 기판의 후면에 일정한 두께로 도포되어 형성되는 것이 바람직하다.Further, the fluorescent film is preferably formed by applying a constant thickness on the back surface of the first substrate.

이하 도 2를 참조하여 본 발명의 실시예에 따른 형광막이 포함된 액정표시장치의 구성에 대하여 상세하게 설명한다.Hereinafter, a configuration of a liquid crystal display device including a fluorescent film according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 2.

도 2를 참조하면, 본 발명의 실시예에 따른 형광막이 포함된 액정표시장치 는, 자외선을 방출하는 백라이트 유닛(10), 백라이트 유닛에서 방출되는 자외선을 가시광선으로 변환시키는 형광막(20) 및, 형광막이 형성되는 LCD 패널(30)을 포함한다.Referring to FIG. 2, a liquid crystal display including a fluorescent film according to an embodiment of the present invention includes a backlight unit 10 emitting ultraviolet light, a fluorescent film 20 converting ultraviolet light emitted from the backlight unit into visible light, and And an LCD panel 30 in which a fluorescent film is formed.

백라이트 유닛(10)은 비발광성 소자인 액정층(32)으로 광을 공급한다. 종래의 기술에서 제공되던 백라이트 유닛과는 달리 본 발명에 따른 백라이트 유닛(10)에는 형광물질이 배제된다. 따라서, 내부에 네온(Ne) 등과 같은 불활성 가스가 충전된 램프에 일정한 전압이 가해지면서 자외선을 방출시킨다.The backlight unit 10 supplies light to the liquid crystal layer 32 that is a non-light emitting device. Unlike the backlight unit provided in the related art, the fluorescent substance is excluded from the backlight unit 10 according to the present invention. Therefore, a constant voltage is applied to a lamp filled with an inert gas such as neon and emits ultraviolet rays.

형광막(20)은 LCD 패널(30)의 후면에 형성된다. LCD 패널(30)의 후면은 제1 기판(31)의 후면을 의미한다. 형광막(20)을 형성시키는 방법은 기존의 백라이트 유닛으로서 활용되던 형광램프에 포함되는 형광막을 형성하기 위해 사용하는 도포방법이 이용될 수 있다. 일반적으로 알려진 스크린 프린팅, 스프레이 등과 같은 방법이 이용될 수 있다. 이러한 형광막은 일정한 두께로 도포되어 형성되는 것이 바람직하다. 또한 LCD 패널(30)의 후면 전체에 걸쳐 여백이 없도록 도포되어야 할 것이다. The fluorescent film 20 is formed on the back of the LCD panel 30. The rear surface of the LCD panel 30 refers to the rear surface of the first substrate 31. As a method of forming the fluorescent film 20, a coating method used to form a fluorescent film included in a fluorescent lamp used as a conventional backlight unit may be used. Generally known methods such as screen printing, spraying and the like can be used. Such a fluorescent film is preferably formed by applying a constant thickness. It should also be applied so that there is no margin over the entire back of the LCD panel 30.

백라이트 유닛(10)에서 방출된 자외선은 형광막(20)을 자극하게 되고 자외선은 형광막(20)을 통해 가시광선으로 변환된다. 따라서 자연스럽게 면광원이 구현된다. 이러한 면광원은 종래의 기술에 의한 형광램프를 통한 광원과 비교할 때 휘도 균일성에 있어서 효율적이다. 또한 백라이트 유닛(10)에서 발생되는 자외선의 파장변화로 발생되는 열을 LCD 패널(30)과 백라이트 유닛(10)이 각각 분산시키므로 효율적이다. 더욱이 충분한 휘도 균일성이 제공되므로 별도의 확산판(2, 도 1 참조) 이 필요하지 않게 된다.The ultraviolet light emitted from the backlight unit 10 stimulates the fluorescent film 20 and the ultraviolet light is converted into visible light through the fluorescent film 20. Therefore, the surface light source is naturally realized. Such a surface light source is efficient in luminance uniformity as compared with a light source through a fluorescent lamp according to the prior art. In addition, since the LCD panel 30 and the backlight unit 10 respectively disperse heat generated by the wavelength change of the ultraviolet light generated by the backlight unit 10, it is efficient. Furthermore, sufficient luminance uniformity is provided so that no separate diffuser plate 2 (see FIG. 1) is needed.

LCD 패널(30)은 제1 기판(31)과, 제1 기판(31)과 일정 간격으로 이격되어 평행하게 대면하는 제2 기판(33) 및, 제1 기판(31)과 제2 기판(33)의 사이에 충전되는 액정층(32)을 포함한다.The LCD panel 30 includes a first substrate 31, a second substrate 33 facing parallel to the first substrate 31 at regular intervals, and a first substrate 31 and a second substrate 33. The liquid crystal layer 32 is filled in between.

제1 기판(31)은 사각형의 유리 평판으로 형성되며, 형광막(20)의 일부 손실로 누설될 수 있는 자외선을 차단하는 자외선 차단 물질이 포함될 수 있다. The first substrate 31 may be formed of a rectangular glass plate, and may include an ultraviolet blocking material that blocks ultraviolet rays that may leak due to a partial loss of the fluorescent film 20.

액정층(32)은 고체물질을 가열하여 녹이면 복굴절(複屈折) 등의 이방성(異方性)을 나타내는 액체상이 되는 것으로서, 분자의 배열이 어떤 방향으로는 불규칙적이며 액체상태인데 다른 방향으로는 규칙적이어서 광학적으로 결정상태를 나타내는 이방성 액체를 포함한다. 액정이 되는 물질에는 그 밖에 벤조산콜레스테린ㅇ파라아족시페네톨ㅇ파라메톡시신남산ㅇ올레산나트륨 등이 많이 알려져 있다. The liquid crystal layer 32 is a liquid phase exhibiting anisotropy such as birefringence when the solid material is heated and melted. The arrangement of molecules is irregular in one direction and is in a liquid state, but regular in the other direction. Subsequently, an anisotropic liquid which shows an optically crystalline state is included. In addition to the substance which becomes a liquid crystal, cholesterol benzoate paraparasiphenetol paramethoxy cinnamic acid sodium oleate etc. are known a lot.

제2 기판(33)은 형광막(20)에서 변환된 가시광선이 투과될 수 있는 투명한 재질로 형성된다. 제1 기판(31)과 같이 유리 소재가 이용될 수 있을 것이다. 제2 기판(33) 역시 자외선 차단 물질이 포함될 수 있다. The second substrate 33 is formed of a transparent material through which visible light converted from the fluorescent film 20 can pass. A glass material may be used as the first substrate 31. The second substrate 33 may also include a sunscreen material.

위와 같은 제1 기판(31) 및 제2 기판(33)은 일정한 틀로 형성되는 하우징에 의해 고정된다. 이는 일반적인 LCD 패널에 포함되는 구성과 같은 것으로서 상세한 설명은 생략한다. The first substrate 31 and the second substrate 33 as described above is fixed by a housing formed in a predetermined frame. This is the same as the configuration included in a general LCD panel and a detailed description thereof will be omitted.

이상에서 설명한 본 발명의 실시예에 따른 형광막을 포함하는 액정표시장치 에 의하면, LCD 패널의 후면에 일정한 두께로 도포되는 형광막을 통해 면광원을 구현할 수 있으므로, 높은 휘도 균일성을 제공하며, 별도의 확산판을 배제시킬 수 있어 조립공정을 단축시키고 생산비용을 절감할 수 있는 효과가 있다.According to the liquid crystal display device including the fluorescent film according to the embodiment of the present invention described above, it is possible to implement a surface light source through a fluorescent film coated with a constant thickness on the back of the LCD panel, providing a high luminance uniformity, The diffusion plate can be eliminated, thereby reducing the assembly process and reducing the production cost.

Claims (3)

자외선을 방출하는 백라이트 유닛;A backlight unit emitting ultraviolet rays; 상기 백라이트 유닛에서 방출되는 자외선을 가시광선으로 변환시키는 형광막; 및,A fluorescent film converting ultraviolet rays emitted from the backlight unit into visible light; And, 상기 형광막이 도포되는 LCD 패널을 포함하며,An LCD panel to which the fluorescent film is applied, 상기 형광막은 상기 LCD 패널의 전체에 걸쳐 여백이 없도록 도포되는 것을 특징으로 하는 형광막이 포함된 액정표시장치.The fluorescent film is a liquid crystal display comprising a fluorescent film, characterized in that the coating is applied so that there is no margin over the entire LCD panel. 제1항에 있어서, The method of claim 1, 상기 LCD 패널은, 제1 기판;과 상기 제1 기판과 일정 간격으로 이격되어 평행하게 대면하는 제2 기판; 및 상기 제1 기판과 제2 기판 사이에 충전되는 액정층;을 포함하며,The LCD panel may include: a first substrate; a second substrate spaced apart from the first substrate at a predetermined interval and facing in parallel; And a liquid crystal layer filled between the first substrate and the second substrate. 상기 형광막은 상기 제1 기판이 상기 제2 기판을 대면하는 면의 반대면으로서 상기 제1 기판의 후면에 형성되는 것을 특징으로 하는 형광막이 포함된 액정표시장치. And the fluorescent film is formed on a rear surface of the first substrate as a surface opposite to a surface on which the first substrate faces the second substrate. 제2항에 있어서, 상기 형광막은,The method of claim 2, wherein the fluorescent film, 상기 제1 기판의 후면에 일정한 두께로 도포되어 형성되는 것을 특징으로 하 는 형광막이 포함된 액정표시장치.A liquid crystal display device comprising a fluorescent film, characterized in that formed on the back of the first substrate is coated with a predetermined thickness.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002082327A (en) * 2000-05-18 2002-03-22 Hitachi Ltd Liquid crystal display
KR20020036888A (en) * 2000-11-11 2002-05-17 김순택 Flat display device comprising material layers for electron amplification having carbon nanotube layer and method for manufacturing the same
KR100382057B1 (en) 1995-03-17 2003-07-16 삼성에스디아이 주식회사 Plzt flat display panel and method for manufacturing the same
KR20060029074A (en) * 2004-09-30 2006-04-04 삼성에스디아이 주식회사 Electron emission display and method of manufacturing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100382057B1 (en) 1995-03-17 2003-07-16 삼성에스디아이 주식회사 Plzt flat display panel and method for manufacturing the same
JP2002082327A (en) * 2000-05-18 2002-03-22 Hitachi Ltd Liquid crystal display
KR20020036888A (en) * 2000-11-11 2002-05-17 김순택 Flat display device comprising material layers for electron amplification having carbon nanotube layer and method for manufacturing the same
KR20060029074A (en) * 2004-09-30 2006-04-04 삼성에스디아이 주식회사 Electron emission display and method of manufacturing the same

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