KR101779606B1 - one body optical transforming sheet, backlight unit and liquid crystal display device module having the same - Google Patents

one body optical transforming sheet, backlight unit and liquid crystal display device module having the same Download PDF

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KR101779606B1
KR101779606B1 KR1020100054830A KR20100054830A KR101779606B1 KR 101779606 B1 KR101779606 B1 KR 101779606B1 KR 1020100054830 A KR1020100054830 A KR 1020100054830A KR 20100054830 A KR20100054830 A KR 20100054830A KR 101779606 B1 KR101779606 B1 KR 101779606B1
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light
liquid crystal
layer
diffusion
backlight unit
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KR20110135097A (en
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황재철
김진욱
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엘지디스플레이 주식회사
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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
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • 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
    • 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
    • G02F1/133553—Reflecting elements
    • 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
    • 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
    • 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
    • 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
    • G02F1/133621—Illuminating devices providing coloured light

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

Abstract

본 발명은 액정표시장치 모듈에 관한 것으로, 본 발명에 따른 액정표시장치 모듈은 액정패널과, 상기 액정패널에 광을 공급하는 청색 LED 광원과, 상기 청색 LED 광원으로부터의 광을 상기 액정패널방향으로 안내하는 도광판과, 상기 도광판의 상면에 배치되고, 상기 청색 LED 광원으로부터의 청색광을 백색광으로 구현하는 일체형 광변환시트를 포함한다. A liquid crystal display device module according to the present invention includes a liquid crystal panel, a blue LED light source for supplying light to the liquid crystal panel, and a light source for emitting light from the blue LED light source toward the liquid crystal panel And an integrated light conversion sheet disposed on an upper surface of the light guide plate and configured to emit blue light from the blue LED light source as white light.

Description

일체형 광변환시트, 이를 구비한 백라이트유닛 및 액정표시장치 모듈{one body optical transforming sheet, backlight unit and liquid crystal display device module having the same}BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an integrated light conversion sheet, a backlight unit having the same, and a liquid crystal display module having a backlight unit and a liquid crystal display module having the same.

본 발명은 LED 광원을 사용하는 액정표시장치 모듈에 관한 것이다. The present invention relates to a liquid crystal display module using an LED light source.

최근에는 전기적 화상신호의 인가에 의한 액정배향에 따라 출력되는 광신호로서 화상을 표시하는 액정표시장치(LCD)가 디스플레이 장치 산업 분양에서 점점 중요한 위치를 차지하고 있다. In recent years, a liquid crystal display (LCD), which displays an image as an optical signal outputted in accordance with the liquid crystal alignment by the application of an electrical image signal, occupies an increasingly important position in the display industry industry sale.

특히, 액정표시장치는 다른 표시장치에 비해 경박단소하기 때문에 노트북 컴퓨터, 휴대폰, MP3 플레이어, PDA, 디지털 카메라, 디지털 시계 등과 같은 표시장치로서 절대적인 위치를 차지하고 있다. Particularly, since the liquid crystal display device is thinner than other display devices, it occupies an absolute position as a display device such as a notebook computer, a mobile phone, an MP3 player, a PDA, a digital camera, a digital clock and the like.

그러나, 이러한 액정표시장치의 액정은 자체적인 발광능력이 없기 때문에 그 자체로는 화상을 표시할 수 없으며, 화상을 표시하기 위해서는 별도의 광원을 구비하여야 한다. 또한 광원으로부터 광을 액정에 직접 조사하는 것이 아니라 도광판과 확산시트 등과 같은 부가적인 광학 부품들을 통해 액정에 조사된다. However, since the liquid crystal of such a liquid crystal display device does not have its own light emitting ability, an image can not be displayed by itself, and a separate light source is required to display an image. Further, the light is not directly irradiated onto the liquid crystal from the light source but is irradiated on the liquid crystal through additional optical components such as a light guide plate and a diffusion sheet.

도 1에는 종래 기술에 따른 액정표시장치 모듈을 대략적으로 나타낸 단면도이다. 1 is a schematic cross-sectional view of a conventional LCD module.

도 1에 도시된 바와 같이, 액정표시장치 모듈에는 에지형 백라이트와 액정패널(미도시)이 차례로 적층되어 있고, 에지형 백라이트는 일측 말단에 LED 광원(10)이 장착되어 있고, LED 광원(10)의 측면으로 도광판(12)이 형성되어 있으며, 상기 도광판(12)의 하면으로는 반사시트(11)가 배치되고, 도광판(12)의 상면으로는 확산시트(14), 프리즘 시트(16)이 차례로 적층되어 있다. 1, an edge type backlight and a liquid crystal panel (not shown) are sequentially stacked on a liquid crystal display module, and the edge type backlight has an LED light source 10 mounted on one end thereof. The LED light source 10 A reflective sheet 11 is disposed on the lower surface of the light guide plate 12 and a diffusion sheet 14 and a prism sheet 16 are disposed on the upper surface of the light guide plate 12. The light guide plate 12 is formed of a light- Are stacked in this order.

이와 같은 구성을 갖는 액정표시장치 모듈은 LED를 광원으로 이용한 백라이트 방식으로 이루어지는 데, 이는 LED 광원(10)으로부터 발산된 빛의 경로가 전면을 향하게 되는 도광판(12)과, 상기 도광판(12)을 통해 입사된 빛을 확산 및 산란시켜 백라이트 출광면 정면방향의 휘도를 증대시키고 균일화시키는 확산시트(14)를 거쳐 액정패널(미도시)에 투사되는 원리에 의하여 작동되는 것을 말한다. 그리고, 프리즘 시트(16)은 확산시트로부터 투사된 빛을 출광면 정면 이외의 방향으로 나가는 것을 막고, 광지향성을 향상시켜 시야각을 좁혀서 백라이트 출광면 정면방향으로 휘도를 증가시켜 주게 된다. The liquid crystal display module having such a structure is made of a backlight system using an LED as a light source, which comprises a light guide plate 12 whose path of light emitted from the LED light source 10 faces the front, (Not shown) through a diffusion sheet 14 that diffuses and scatters incident light through the diffusion sheet 14 for increasing and equalizing the brightness in the front surface direction of the backlight emitting surface. The prism sheet 16 prevents the light projected from the diffusion sheet from going out in the direction other than the front surface of the light exiting surface, thereby improving the light directivity and narrowing the viewing angle, thereby increasing the brightness in the front surface direction of the backlight emitting surface.

따라서 상기 액정표시장치 모듈은 전술한 바와 같은 경로, 즉, LED 광원(10)에서 도광판(12)과 확산시트(14), 프리즘 시트(16), 액정패널(미도시)을 차례로 거친 빛에 의해 사용자가 액정상의 표시문자나 기호를 읽게 된다. Accordingly, the liquid crystal display device module can be formed by the light path of the light guide plate 12, the diffusion sheet 14, the prism sheet 16, and the liquid crystal panel (not shown) The user reads the display characters or symbols on the liquid crystal display.

그러나, 종래의 LED 광원(10)은 백색 LED 칩을 사용하였으나, 백색 LED 칩은 청색 LED 칩, 녹색 LED 칩, 적(勣)색 LED 칩보다 가격이 높은 단점이 있어 백색 LED 칩을 광원으로 사용하는 액정표시장치 모듈의 가격이 상승하게 되는 문제점이 있다. However, the conventional LED light source 10 uses a white LED chip, but the white LED chip has a disadvantage that the price is higher than the blue LED chip, the green LED chip, and the red LED chip, There is a problem that the price of the liquid crystal display device module increases.

상술한 문제점을 해결하기 위한 본 발명의 목적은 제조비용을 감소시킬 수 있도록 하는 액정표시장치 모듈을 제공함에 있다. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a liquid crystal display module that can reduce manufacturing costs.

상술한 목적을 달성하기 위한 본 발명에 따른 백라이트 유닛은 광원과 상기 광원 상부의 일체형 광변환시트를 포함하고, 상기 일체형 광변환시트는, 확산층과 상기 확산층 상의 형광체층과 상기 형광체층 상의 프리즘층을 구비한다.According to an aspect of the present invention, there is provided a backlight unit including a light source and an integrated light conversion sheet on the light source, the integrated light conversion sheet including a diffusion layer, a phosphor layer on the diffusion layer, and a prism layer on the phosphor layer. Respectively.

상기 형광체층은 형광입자 형성영역과 형광입자 비형성 영역을 포함한다.The phosphor layer includes a fluorescent particle forming region and a fluorescent particle non-forming region.

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상기 확산층과 도광판 사이에 배치되는 폴리머 기재가 더 포함되고, 상기 폴리머 기재는 폴리에틸렌 테레프탈레이트(Polyethylene tetrephthalate, PET), 폴리에틸렌 나프탈레이트(polyethylene naphthalate, PEN), 폴리카보네이트(PC) 중 어느 하나를 사용한다. And a polymer substrate disposed between the diffusion layer and the light guide plate, wherein the polymer substrate is selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polycarbonate (PC) .

상기 확산층은 확산입자가 분산된 바인더 수지를 포함하고, 상기 형광체층은 황색 형광입자를 포함하며, 상기 프리즘층은 광경화성 수지를 포함한다. Wherein the diffusion layer includes a binder resin in which diffusion particles are dispersed, the phosphor layer includes yellow fluorescent particles, and the prism layer includes a photocurable resin.

상기 확산층은 확산시트를 포함하며, 상기 형광체층은 양자점을 포함하고 적색 및 녹색 형광체가 혼합된 구조를 포함한다. The diffusion layer includes a diffusion sheet, and the phosphor layer includes a quantum dot and a structure in which red and green phosphors are mixed.

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이상에서와 같이, 본 발명에 따른 액정표시장치 모듈은 광원으로부터 출사된 청색광이 일체형 광변환시트의 확산층, 형광체층, 프리즘층을 통해 확산, 광변환, 집광하여 백색광으로 변환하게 된다. As described above, in the liquid crystal display module according to the present invention, the blue light emitted from the light source is diffused, converted into light, condensed through the diffusion layer, the phosphor layer, and the prism layer of the integrated light conversion sheet and converted into white light.

따라서, 본 발명에 따른 액정표시장치 모듈은 LED 광원으로써 백색 LED 칩보다 가격이 저렴한 청색 LED 칩을 사용함으로써, 백색 LED 칩을 광원으로 사용하는 액정표시장치 모듈의 가격을 낮출 수 있게 되는 효과가 있다. Accordingly, the liquid crystal display module according to the present invention can reduce the price of a liquid crystal display module using a white LED chip as a light source by using a blue LED chip which is less expensive than a white LED chip as an LED light source .

그리고, 본 발명에 따른 액정표시장치 모듈은 청색 LED와 형광체층을 포함한 일체형 광변환시트를 사용함으로써, LED 광원에 따로 형광체 주입등의 패키지공정이 필요치 않아 박형으로 제작할 수 있게 되는 효과가 있다. In addition, the liquid crystal display module according to the present invention uses an integrated light conversion sheet including a blue LED and a phosphor layer, so that a package process such as phosphor injection is not required for the LED light source.

그리고, 본 발명에 따른 액정표시장치 모듈은 광변환시트를 도광판 상부에 배치하여 LED 광원으로부터 일정 거리를 유지함으로써 LED 내부의 고열에 의한 형광체 열화 및 광추출 효율의 하락을 방지할 수 있게 되는 효과가 있다. In the liquid crystal display module according to the present invention, the light conversion sheet is disposed on the upper side of the light guide plate to maintain a certain distance from the LED light source, so that deterioration of the phosphor due to the high heat inside the LED and deterioration of the light extraction efficiency can be prevented have.

그리고, 본 발명에 따른 액정표시장치 모듈은 일체형 광변환시트에 확산층과 프리즘층을 포함하여 확산 및 프리즘 기능을 부가함으로써 기존 구조의 다양한 시트를 제거할 수 있게 되어 박형화 및 원가 절감을 기재할 수 있게 되는 효과가 있다. Further, the liquid crystal display module according to the present invention can diffuse and prism functions by including a diffusing layer and a prism layer in the integrated light conversion sheet, thereby various sheets of existing structure can be removed, .

도 1에는 종래 기술에 따른 액정표시장치 모듈을 대략적으로 나타낸 단면도
도 2는 본 발명에 따른 액정표시장치 모듈을 도시한 도면
도 3a는 본 발명의 제1 실시예에 따른 일체형 광변환시트를 도시한 도면
도 3b는 본 발명의 제1 실시예에 따른 일체형 광변환시트를 도시한 도면
도 3c는 본 발명의 제3 실시예에 따른 일체형 광변환시트를 도시한 도면
도 4는 본 발명의 또 다른 액정표시장치 모듈을 도시한 도면1 is a cross-sectional view schematically showing a liquid crystal display
2 is a view showing a liquid crystal display module according to the present invention;
3A is a view showing an integrated light conversion sheet according to the first embodiment of the present invention;
FIG. 3B is a view showing an integrated light conversion sheet according to the first embodiment of the present invention; FIG.
3C is a view showing an integrated light conversion sheet according to a third embodiment of the present invention
4 is a view showing another liquid crystal display module of the present invention

이하, 첨부된 도면을 참조하여 본 발명에 따른 액정표시장치 모듈에 대해 설명하고자 한다. Hereinafter, a liquid crystal display module according to the present invention will be described with reference to the accompanying drawings.

도 2는 본 발명에 따른 액정표시장치 모듈을 도시한 도면이다. 2 is a view illustrating a liquid crystal display module according to the present invention.

도 2에 도시된 바와 같이, 본 발명에 따른 액정표시장치 모듈은 에지형 백라이트와 액정패널(미도시)이 차례로 적층되어 있고, 에지형 백라이트는 일측 말단에 LED 광원(100)이 장착되어 있고, 청색 LED칩을 사용하고, LED 광원(100)의 측면에 구비되며 광이 입사되는 입광면이 구비되어 광원으로부터의 광을 액정패널 방향으로 안내하는 도광판(120)이 형성되어 있고, 도광판(120)의 하면으로는 도광판의 바닥면으로 입광되는 광을 도광판(120)의 내부 방향으로 반사시키는 반사판(110)이 형성되어 있고, 상기 도광판(120)의 상면으로는 청색 LED광을 백색광으로 구현할 수 있도록 하는 일체형 광변환 시트(130)를 구비한다. 2, the liquid crystal display module according to the present invention includes an edge type backlight and a liquid crystal panel (not shown) sequentially stacked. The edge type backlight has an LED light source 100 mounted at one end thereof, A light guiding plate 120 provided on a side surface of the LED light source 100 and having a light incident surface on which light is incident and guiding light from the light source toward the liquid crystal panel is formed using a blue LED chip, A reflective plate 110 is formed on the bottom surface of the light guide plate 120 to reflect the light incident on the bottom surface of the light guide plate 120 toward the inner side of the light guide plate 120. The upper surface of the light guide plate 120 may include blue LED light, And an integrated light-converting sheet 130 which is integrally formed.

그리고, 에지형 백라이트의 광원(100)으로부터의 광이 입사되어 영상을 디스플레이하는 액정패널(200)이 구비된다. In addition, a liquid crystal panel 200 for displaying an image by incident light from the light source 100 of the edge-type backlight is provided.

그리고, 휘도를 상승시키기 위해 일체형 광변환시트(130) 상부에 DBEF(Dual Brightness Enhancement Film: 140)과 같은 기능성 시트가 더 추가될 수 있다. In order to increase the brightness, a functional sheet such as a dual brightness enhancement film (DBEF) 140 may be further added on the integrated light conversion sheet 130.

일체형 광변환시트(130)는 확산층, 형광체층, 프리즘층이 적층 형성되어 있고, 광원(100)으로부터 방출되어 도광판(120)에서 출사된 청색광은 확산층을 통해 확산되고 이 확산된 광은 확산층 상부에 적층된 형광체층의 형광입자에서 흡수되어 다른 파장의 광으로 변하게 된다. 이때, 확산층으로부터 확산된 광 중 형광체층의 형광입자에 상응하지 않는 영역의 광은 형광체층을 그대로 투과하여 청색광을 유지하게 된다. 이와 같이 형광체층의 형광입자에서 흡수되어 다른 파장으로 변한 광과 형광체층의 형광입자로 흡수되지 않고 그대로 투과된 청색광이 혼합되어 백색광으로 변하게 되고, 상부의 프리즘층을 통과하여 집광하게 된다. The integrated light conversion sheet 130 is formed by laminating a diffusion layer, a phosphor layer and a prism layer. The blue light emitted from the light source 100 and emitted from the light guide plate 120 is diffused through a diffusion layer, It is absorbed by the fluorescent particles of the laminated phosphor layer and changed into light of another wavelength. At this time, among the light diffused from the diffusion layer, light in a region that does not correspond to the fluorescent particles of the phosphor layer passes through the phosphor layer as it is and maintains blue light. As described above, the light absorbed by the fluorescent particles of the fluorescent layer and converted to other wavelengths is mixed with the blue light which is not absorbed by the fluorescent particles of the fluorescent layer and is converted into white light, and is condensed through the upper prism layer.

따라서, 광원으로부터 출사된 청색광이 일체형 광변환시트의 확산층, 형광체층, 프리즘층을 통해 확산, 광변환, 집광하여 백색광으로 변환하게 된다. Therefore, the blue light emitted from the light source is diffused, converted, and condensed through the diffusion layer, the phosphor layer, and the prism layer of the integrated light conversion sheet, and is converted into white light.

이상에서와 같이 LED 광원으로써 백색 LED 칩보다 가격이 저렴한 청색 LED 칩을 사용함으로써, 백색 LED 칩을 광원으로 사용하는 액정표시장치 모듈의 가격을 낮출 수 있게 된다. As described above, by using a blue LED chip which is cheaper than the white LED chip as the LED light source, the price of the liquid crystal display module using the white LED chip as a light source can be lowered.

그리고, 청색 LED와 형광체층을 포함한 일체형 광변환시트를 사용함으로써, LED 광원에 따로 형광체 주입등의 패키지공정이 필요치 않아 박형으로 제작할 수 있게 된다. By using an integrated light conversion sheet including a blue LED and a phosphor layer, a packaging process such as phosphor injection is not required for the LED light source, so that it can be manufactured in a thin shape.

그리고, 광변환시트를 도광판 상부에 배치하여 LED 광원으로부터 일정 거리를 유지함으로써 LED 내부의 고열에 의한 형광체 열화 및 광추출 효율의 하락을 방지할 수 있게 된다. By disposing the light conversion sheet on the upper side of the light guide plate and maintaining a certain distance from the LED light source, deterioration of the phosphor due to the high heat inside the LED and deterioration of the light extraction efficiency can be prevented.

그리고, 일체형 광변환시트에 확산층과 프리즘층을 포함하여 확산 및 프리즘 기능을 부가함으로써 기존 구조의 다양한 시트를 제거할 수 있게 되어 박형화 및 원가 절감을 기재할 수 있게 된다. In addition, it is possible to remove various sheets of the existing structure by adding diffusion and prism functions to the integrated light conversion sheet and adding the diffusion and prism functions, thereby making it possible to describe thinning and cost reduction.

이상에서와 같은 본 발명에 따른 일체형 광변환시트에 대해 다음에서 상세히 설명하고자 한다. The integrated light conversion sheet according to the present invention as described above will be described in detail below.

도 3a는 본 발명의 제1 실시예에 따른 일체형 광변환시트를 도시한 도면이고, 도 3b는 본 발명의 제2 실시예에 따른 일체형 광변환시트를 도시한 도면이고, 도 3c는 본 발명의 제3 실시예에 따른 일체형 광변환시트를 도시한 도면이다.FIG. 3A is a view showing an integrated light conversion sheet according to a first embodiment of the present invention, FIG. 3B is a view showing an integrated light conversion sheet according to a second embodiment of the present invention, and FIG. Fig. 7 is a view showing an integrated light conversion sheet according to the third embodiment. Fig.

도 3a에 도시된 바와 같은 일체형 광 변환시트(130)는 폴리머 기재(140), 확산층(142a), 형광체층(144), 프리즘층(146)의 순서로 적층되어 있다. The integrated light conversion sheet 130 as shown in Fig. 3A is laminated in the order of the polymer substrate 140, the diffusion layer 142a, the phosphor layer 144, and the prism layer 146 in this order.

폴리머 기재(140)는 투과율이 95% 이상인 투명 고분자 수지로 형성되며 일반적으로 폴리에틸렌 테레프탈레이트(Polyethylene tetrephthalate, PET), 폴리에틸렌 나프탈레이트(polyethylene naphthalate, PEN), 폴리카보네이트(PC) 등이 사용될 수 있다. The polymer substrate 140 is formed of a transparent polymer resin having a transmittance of 95% or more. In general, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC)

확산층(142a)은 고분자 화합물 또는 무기 화합물의 확산 입자가 균일하게 분산된 바인더 수지를 도포하여 형성한다. 고분자 화합물 확산제의 경우, 아크릴, 스틸렌, 실리콘 수지 입자가 사용될 수 있으며 무기 화합물의 경우 산화실리콘(SiO2), 산화 티타늄(TiO2),클레이 등이 사용될 수 있고, 바인더 수지의 경우 열광화성 수지 및 광 경화성 수지가 사용될 수 있다. 그리고, 확산층은 에어 나이프(air knife) 방식, 그라비아(gravure) 방식, 리버스 롤(reverse roll) 방식, 스프레이(spray) 방식 또는 블레이드(blade) 방식 중 어느 하나를 선택하여 증착될 수 있다. The diffusion layer 142a is formed by applying a binder resin in which diffusion particles of a polymer compound or an inorganic compound are uniformly dispersed. In the case of an inorganic compound, silicon oxide (SiO 2 ), titanium oxide (TiO 2 ) and clay may be used. In the case of a binder resin, a thermosetting resin And a photocurable resin may be used. The diffusion layer may be deposited by selecting one of an air knife method, a gravure method, a reverse roll method, a spray method, and a blade method.

형광체층(144)은 확산층(142a) 상부에는 형광체 입자가 균일하게 도포하여 형성된다. 형광체 입자는 황색형광체로서 일반적으로 세륨 도핑된 이트륨 알루미늄 가넛(YAG) 형광체를 사용한다. 확산층의 바인더 수지와의 결합력을 높이기 위해 형광체를 접착력을 가지는 수지에 균일하게 분산하여 도포할 수 있다. 그리고, 형광체층의 형성에 있어서 형광체 입자가 균일한 분포를 가지도록 해야 한다. 형광체 입자의 분포가 균일하지 못할 경우, 청색광의 입사각에 따라 형광체가 흡수하는 광량이 달라지며 결국 색 변화량이 달라지게 되어 최종적인 백라이트 유닛의 구성에 있어 시야각에 따른 색도차이를 보일 수 있다. 따라서 형광체의 균일한 분포를 위해 형광체와 바인더 수지 및 접착제가 적절히 혼합되어야 하며, 기존의 도포 방식이 아닌 프린팅 방식이 적용될 수 있다. 그리고, 색 재현성과 발광 효율을 높이기 위해 상기 형광체는 황색 뿐만 아니라 적색과 녹색이 혼합된 구조 일 수 있으며 나아가 양자효율이 좋으며 순수한 색을 발광하는 양자점을 사용할 수도 있다. The phosphor layer 144 is formed by uniformly coating the phosphor particles on the diffusion layer 142a. The phosphor particles are typically yellow cyan doped yttrium aluminum garnet (YAG) phosphors as yellow phosphors. The phosphor can be uniformly dispersed and applied to a resin having an adhesive force in order to increase the binding force of the diffusion layer with the binder resin. In forming the phosphor layer, the phosphor particles must have a uniform distribution. If the distribution of the phosphor particles is not uniform, the amount of light absorbed by the phosphor varies depending on the incident angle of blue light, and thus the amount of color change is varied. Thus, the chromaticity of the final backlight unit may vary depending on the viewing angle. Therefore, in order to uniformly distribute the phosphor, the phosphor, the binder resin and the adhesive should be properly mixed, and a printing method other than the conventional coating method may be applied. In order to improve color reproducibility and luminous efficiency, the phosphor may have a structure in which not only yellow but also red and green are mixed, and quantum dots which emit pure light with good quantum efficiency may be used.

프리즘층(146)은 형광체층 상에 광경화성 수지를 일정량 균일하게 도포한 후, IPP(In-plane printing)방법을 이용하여 프리즘 패턴을 형성한다. The prism layer 146 is formed by forming a prism pattern using an in-plane printing (IPP) method after uniformly coating a certain amount of a photocurable resin on the phosphor layer.

상기 광경화성 수지는 형광체층과 하부의 확산층과의 적절한 접착력을 가지면서 투과율이 95%이상인 아크릴레이트 계열이 바람직하며, 점도는 50cP이하의 저 점도 수지일 수 있다. The photocurable resin is preferably an acrylate series resin having a transmittance of 95% or more and a viscosity of 50 cP or less with a proper adhesive force between the phosphor layer and the lower diffusion layer.

그리고, 프리즘 패턴의 형상은 삼각형, 프리즘 갈림, 둥근 모양의 프리즘 꼭지각으로 형성될 수 있다. The shape of the prism pattern may be formed by a triangular, prismatic, or round prism apex angle.

그리고, 도 3b에 도시된 바와 같은 일체형 광 변환시트(130)는 도 3a의 폴리머 기재(140) 대신 도광판(120) 상부에 확산층(142a), 형광체층(144), 프리즘층(146)의 순서로 적층되어 있다. The integrated light conversion sheet 130 as shown in FIG. 3B has a structure in which a diffusion layer 142a, a fluorescent layer 144, and a prism layer 146 are formed on the light guide plate 120 in place of the polymer substrate 140 in FIG. Respectively.

확산층(142a)은 도광판 재료인 폴리메틸메타크릴레이트(Polymethylmethacrylate, PMMA)와 접착력이 우수한 바인더에 확산입자를 균일하게 분산 도포한 후 형성한다. The diffusion layer 142a is formed after uniformly dispersing and dispersing the diffusion particles in a binder having excellent adhesion to polymethylmethacrylate (PMMA) as a light guide plate material.

그리고, 형광체층(144) 및 프리즘층(146)은 도 3a에 개시된 형광체층(144)과 프리즘층(146)의 형성과 동일한 방법을 통해 형성한다. The phosphor layer 144 and the prism layer 146 are formed through the same method as the formation of the phosphor layer 144 and the prism layer 146 shown in FIG. 3A.

그리고, 도 3c에 도시된 바와 같은 일체형 광 변환시트(130)는 도 3a의 폴리머 기재(140) 및 확산층(142a) 대신 도광판(120) 상부에 확산시트(142b), 형광체층(144), 프리즘층(146)의 순서로 적층되어 있다. The integrated light conversion sheet 130 as shown in FIG. 3C has a diffusion sheet 142b, a phosphor layer 144, a prism sheet 142b, and a diffusion sheet 142b on the light guide plate 120 instead of the polymer substrate 140 and the diffusion layer 142a of FIG. Layer 146 are stacked in this order.

확산시트(142b)는 확산입자를 균일하게 분산 도포한 후 시트 형태로 제조하고, 형광체층(144) 및 프리즘층(146)은 도 3a에 개시된 형광체층(144)과 프리즘층(146)의 형성과 동일한 방법을 통해 형성한다. The phosphor layer 144 and the prism layer 146 are formed by forming the phosphor layer 144 and the prism layer 146 disclosed in FIG. 3A after the dispersion sheet 142b is uniformly dispersed and applied to the diffusion sheet 142b Is formed through the same method as that described above.

이상에서와 같이, 본 발명에 따른 액정표시장치 모듈은 광원으로부터 출사된 청색광이 일체형 광변환시트의 확산층, 형광체층, 프리즘층을 통해 확산, 광변환, 집광하여 백색광으로 변환하게 된다. As described above, in the liquid crystal display module according to the present invention, the blue light emitted from the light source is diffused, converted into light, condensed through the diffusion layer, the phosphor layer, and the prism layer of the integrated light conversion sheet and converted into white light.

그리고, 본 발명에 따른 액정표시장치 모듈은 LED 광원으로써 백색 LED 칩보다 가격이 저렴한 청색 LED 칩을 사용함으로써, 백색 LED 칩을 광원으로 사용하는 액정표시장치 모듈의 가격을 낮출 수 있게 된다. The liquid crystal display module according to the present invention can reduce the price of a liquid crystal display module using a white LED chip as a light source by using a blue LED chip which is less expensive than a white LED chip as an LED light source.

그리고, 본 발명에 따른 액정표시장치 모듈은 청색 LED와 형광체층을 포함한 일체형 광변환시트를 사용함으로써, LED 광원에 따로 형광체 주입등의 패키지공정이 필요치 않아 박형으로 제작할 수 있게 된다. The liquid crystal display module according to the present invention uses an integrated light conversion sheet including a blue LED and a phosphor layer, so that a packaging process such as phosphor injection is not required for an LED light source, and thus a thin type can be manufactured.

그리고, 본 발명에 따른 액정표시장치 모듈은 광변환시트를 도광판 상부에 배치하여 LED 광원으로부터 일정 거리를 유지함으로써 LED 내부의 고열에 의한 형광체 열화 및 광추출 효율의 하락을 방지할 수 있게 된다. In the liquid crystal display module according to the present invention, the light conversion sheet is disposed on the upper side of the light guide plate to maintain a certain distance from the LED light source, thereby deteriorating the phosphor deterioration due to the high heat inside the LED and deterioration of the light extraction efficiency.

그리고, 본 발명에 따른 액정표시장치 모듈은 일체형 광변환시트에 확산층과 프리즘층을 포함하여 확산 및 프리즘 기능을 부가함으로써 기존 구조의 다양한 시트를 제거할 수 있게 되어 박형화 및 원가 절감을 기재할 수 있게 된다. Further, the liquid crystal display module according to the present invention can diffuse and prism functions by including a diffusing layer and a prism layer in the integrated light conversion sheet, thereby various sheets of existing structure can be removed, do.

한편, 이상에서와 설명하는 본 발명은 LED 광원이 일측 말단에 형성되는 에지형 백라이트를 구비한 액정표시장치 모듈에 대해 설명하고 있지만, 도 4에 도시된 바와 같이, LED 어레이가 액정표시패널의 뒤편에서 바로 전면을 향하여 광을 조사하는 직하형 백라이트를 구비한 액정표시장치 모듈에도 상기 일체형 광변환시트를 적용할 수 있다. Although the present invention described above has been described with respect to a liquid crystal display device module having an edge type backlight in which an LED light source is formed at one end of the liquid crystal display panel, The integrated light conversion sheet may be applied to a liquid crystal display module having a direct-type backlight that directly irradiates light toward the front side.

도 4에 도시된 바와 같이, 본 발명에 따른 액정표시장치 모듈은 직하형 백라이트와 액정패널(200)로 구비되고, 직하형 백라이트는 반사판(310), LED 광원(320), 확산판(325), 일체형 광변환 시트(130), DBEF(Dual Brightness Enhancement Film: 140)이 적층되어 있다. 4, the liquid crystal display module according to the present invention includes a direct-type backlight and a liquid crystal panel 200. The direct-type backlight includes a reflection plate 310, an LED light source 320, a diffusion plate 325, An integrated light conversion sheet 130, and a DBEF (Dual Brightness Enhancement Film) 140 are stacked.

100: LED 광원 110: 반사판
120: 도광판 130: 일체형 광변환 시트
140: DBEF 200: 액정패널100: LED light source 110: reflector
120: light guide plate 130: integrated light conversion sheet
140: DBEF 200: liquid crystal panel

Claims (13)

광원; 및
상기 광원 상부의 일체형 광변환시트를 포함하고,
상기 일체형 광변환시트는,
확산층;
상기 확산층 상에서 상기 확산층과 직접 접하는 형광체층;
상기 형광체층 상에서 상기 형광체층과 직접 접하는 프리즘층을 구비하고,
상기 형광체층은 형광입자 형성영역과 형광입자 비형성 영역을 포함하고,
상기 확산층은 상기 형광체층 하부에서 상기 광원의 광을 확산하여 상기 형광입자 형성영역에 입사되는 광과 상기 형광입자 비형성 영역에 입사되는 광을 균일하게 하도록 구성된, 백라이트 유닛.Light source; And
And an integrated light conversion sheet on the light source,
The integrated type light conversion sheet comprises:
Diffusion layer;
A phosphor layer directly contacting the diffusion layer on the diffusion layer;
And a prism layer directly contacting the phosphor layer on the phosphor layer,
Wherein the phosphor layer includes a fluorescent particle forming region and a fluorescent particle non-forming region,
Wherein the diffusion layer diffuses the light of the light source at the lower portion of the phosphor layer so as to make uniform the light incident on the fluorescent particle forming region and the light incident on the fluorescent particle non-forming region. 삭제delete 제1항에 있어서,
상기 확산층 하부에 배치되는 폴리머 기재가 더 포함된 백라이트 유닛.The method according to claim 1,
And a polymer substrate disposed under the diffusion layer. 제3항에 있어서,
상기 폴리머 기재는,
폴리에틸렌 테레프탈레이트(Polyethylene tetrephthalate, PET), 폴리에틸렌 나프탈레이트(polyethylene naphthalate, PEN), 폴리카보네이트(PC) 중 어느 하나를 사용하는 백라이트 유닛. The method of claim 3,
Preferably,
A backlight unit using any one of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polycarbonate (PC). 제1항에 있어서, 상기 확산층은
확산입자가 분산된 바인더 수지를 포함하는 백라이트 유닛.The method of claim 1, wherein the diffusion layer
A backlight unit comprising a binder resin in which diffusion particles are dispersed. 제1항에 있어서,
상기 형광체층은
황색 형광입자를 포함하는 백라이트 유닛.The method according to claim 1,
The phosphor layer
A backlight unit comprising yellow fluorescent particles. 제1항에 있어서,
상기 프리즘층은
광경화성 수지를 포함하는 백라이트 유닛. The method according to claim 1,
The prism layer
A backlight unit comprising a photocurable resin. 제1항에 있어서,
상기 확산층은 확산시트인 백라이트 유닛.The method according to claim 1,
Wherein the diffusion layer is a diffusion sheet. 제1 항에 있어서,
상기 형광체층은 양자점을 포함하는 백라이트 유닛.The method according to claim 1,
Wherein the phosphor layer comprises a quantum dot. 제1 항에 있어서,
상기 형광체층은 적색 및 녹색 형광체가 혼합된 구조인 백라이트 유닛.The method according to claim 1,
Wherein the phosphor layer is a mixture of red and green phosphors. 제1항, 및 제3항 내지 제10항 중 어느 하나인 백라이트 유닛; 및
상기 백라이트 유닛 상의 액정패널을 포함하는 액정표시장치 모듈.A backlight unit according to any one of claims 1 to 10. And
And a liquid crystal panel on the backlight unit. 제11항에 있어서,
상기 액정패널 하부에 도광판을 더 포함하는 액정표시장치 모듈.12. The method of claim 11,
And a light guide plate disposed under the liquid crystal panel. 제12항에 있어서,
상기 도광판 하부에 반사판이 배치되는 액정표시장치 모듈.13. The method of claim 12,
And a reflective plate disposed under the light guide plate.
KR1020100054830A 2010-06-10 2010-06-10 one body optical transforming sheet, backlight unit and liquid crystal display device module having the same KR101779606B1 (en)

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