KR101281668B1 - Reflective polarizing plate and liquid crystal display device having thereof - Google Patents

Reflective polarizing plate and liquid crystal display device having thereof Download PDF

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KR101281668B1
KR101281668B1 KR1020060059987A KR20060059987A KR101281668B1 KR 101281668 B1 KR101281668 B1 KR 101281668B1 KR 1020060059987 A KR1020060059987 A KR 1020060059987A KR 20060059987 A KR20060059987 A KR 20060059987A KR 101281668 B1 KR101281668 B1 KR 101281668B1
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light
liquid crystal
crystal display
display device
crystal panel
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KR20080001516A (en
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박재현
이만환
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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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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
    • G02F1/133528—Polarisers
    • G02F1/133536—Reflective polarizers
    • 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

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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)
  • Polarising Elements (AREA)

Abstract

본 발명에 따른 액정표시소자는 광손실을 최소화하여 휘도를 향상시키기 위한 것으로, 액정패널과, 상기 액정패널에 광을 공급하는 적어도 하나의 램프와, 상기 액정패널의 하부에 설치되어 램프로부터 발광된 광을 확산시키는 확산판과, 상기 액정패널과 확산판 사이에 배치되어 확산판에 의해 확산된 광중에서 편광축과 평행한 편광방향의 광은 투과하고 다른 편광방향의 광은 반사시키는 확산판으로 반사시키며, 렌즈형 집광판이 구비되어 투과되는 광을 집광하는 반사형 편광판으로 구성된다.The liquid crystal display according to the present invention is to improve the brightness by minimizing the light loss, the liquid crystal panel, at least one lamp for supplying light to the liquid crystal panel, and is installed below the liquid crystal panel and emitted from the lamp And a diffuser plate for diffusing light and a diffuser plate disposed between the liquid crystal panel and the diffuser plate to transmit light in a polarization direction parallel to the polarization axis and reflect light in the other polarization direction among light diffused by the diffuser plate. A lens type light collecting plate is provided and includes a reflective polarizing plate for collecting light transmitted therethrough.

액정패널, 반사, 편광판, 집광, 렌즈 Liquid Crystal Panel, Reflection, Polarizer, Condensing, Lens

Description

반사형 편광판 및 이를 구비한 액정표시소자{REFLECTIVE POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THEREOF}Reflective polarizing plate and liquid crystal display device having the same {REFLECTIVE POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THEREOF}

도 1은 종래 백라이트가 구비된 액정표시소자의 구조를 나타내는 도면.1 is a view showing the structure of a liquid crystal display device equipped with a conventional backlight.

도 2는 본 발명의 제1실시예에 따른 액정표시소자의 구조를 간략하게 나타내는 도면.2 is a view schematically showing the structure of a liquid crystal display device according to a first embodiment of the present invention.

도 3은 도 2의 A영역 확대도.3 is an enlarged view of area A of FIG. 2;

도 4는 본 발명의 제2실시예에 따른 액정표시소자의 구조를 간략하게 나타내는 도면.4 is a view schematically showing the structure of a liquid crystal display device according to a second embodiment of the present invention.

도 5는 도 4의 B영역 확대도.5 is an enlarged view of region B of FIG. 4;

* 도면의 주요부분에 대한 부호의 설명 *Description of the Related Art [0002]

203 : 액정패널 211 : 램프203: liquid crystal panel 211: lamp

215 : 확산판 216 : 편광판215 diffuser plate 216 polarizer

217 : 집광판 218 : 반사부217: light collecting plate 218: reflector

본 발명은 액정표시소자의 반사형 편광판에 관한 것으로, 특히 광손실을 최 소화하여 휘도를 향상시킬 수 있는 반사형 편광판 및 이를 구비한 액정표시소자에 관한 것이다.The present invention relates to a reflective polarizer of a liquid crystal display device, and more particularly to a reflective polarizer and a liquid crystal display device having the same to minimize the light loss to improve the brightness.

근래, 핸드폰(Mobile Phone), PDA, 노트북컴퓨터와 같은 각종 휴대용 전자기기가 발전함에 따라 이에 적용할 수 있는 경박단소용의 평판표시장치(Flat Panel Display Device)에 대한 요구가 점차 증대되고 있다. 이러한 평판표시장치로는 LCD(Liquid Crystal Display), PDP(Plasma Display Panel), FED(Field Emission Display), VFD(Vacuum Fluorescent Display) 등이 활발히 연구되고 있지만, 양산화 기술, 구동수단의 용이성, 고화질의 구현이라는 이유로 인해 현재에는 액정표시소자(LCD)가 각광을 받고 있다.2. Description of the Related Art Recently, various portable electronic devices such as a mobile phone, a PDA, and a notebook computer have been developed. Accordingly, there is a growing need for a flat panel display device for a light and small size. Such flat panel displays are being actively researched, such as LCD (Liquid Crystal Display), PDP (Plasma Display Panel), FED (Field Emission Display), VFD (Vacuum Fluorescent Display), but mass production technology, ease of driving means, Liquid crystal display devices (LCDs) are in the spotlight for reasons of implementation.

상기 액정표시소자는 투과형 표시소자로서, 액정분자의 굴절률 이방성에 의해 액정층을 투과하는 광의 양을 조절함으로써 원하는 화상을 화면상에 표시한다.The liquid crystal display element is a transmissive display element and displays a desired image on the screen by adjusting the amount of light transmitted through the liquid crystal layer by refractive index anisotropy of liquid crystal molecules.

따라서, 액정표시소자에서는 화상의 표시를 위해 액정층에 광을 공급하여 액정표시소자에 화상을 표시하는 백라이트(back light)가 설치된다.Therefore, in the liquid crystal display device, a back light is provided for supplying light to the liquid crystal layer to display the image and displaying the image on the liquid crystal display device.

도 1에 백라이트가 적용된 종래 액정표시소자의 구조가 도시되어 있다.1 illustrates a structure of a conventional liquid crystal display device in which a backlight is applied.

도면에 도시된 바와 같이, 액정표시소자(1)는 크게 액정패널(liquid crystal display panel;3)과 상기 액정패널(3)의 후면에 설치된 백라이트(10)로 이루어진다. 액정패널(3)은 실제 화상이 구현되는 곳으로, 유리와 같은 투명한 하부기판(3a) 및 상부기판(3b)과 그 사이의 형성된 액정층(도면표시하지 않음)으로 이루어진다. 특히, 도면에는 도시하지 않았지만, 하부기판(3a)은 박막트랜지스터(thin film transistor)와 같은 구동소자 및 화소전극이 형성되는 TFT기판이고 상부기 판(3b)은 컬러필터층(color filter layer)이 형성되는 컬러필터기판이다. 또한, 상기 하부기판(3a)의 측면에는 구동회로부(5)가 구비되어 하부기판(3a)에 형성된 박막트랜지스터와 화소전극에 각각 신호를 인가한다.As shown in the figure, the liquid crystal display device 1 is largely comprised of a liquid crystal panel 3 and a backlight 10 provided on the rear surface of the liquid crystal panel 3. The liquid crystal panel 3 is where an actual image is realized, and is composed of a transparent lower substrate 3a such as glass and an upper substrate 3b and a liquid crystal layer (not shown) formed therebetween. In particular, although not shown in the drawing, the lower substrate 3a is a TFT substrate on which a driving element such as a thin film transistor and a pixel electrode are formed, and the upper substrate 3b is formed of a color filter layer. It is a color filter substrate. In addition, a driving circuit unit 5 is provided on the side of the lower substrate 3a to apply signals to the thin film transistor and the pixel electrode formed on the lower substrate 3a, respectively.

상기 백라이트(10)는 직하형 백라이트로서, 액정패널(3)의 하부에 위치하여 광을 방출함에 따라 액정패널(3)에 광을 공급하는 하는 램프(11)와, 상기 램프(11)로부터 방출되는 광을 반사하여 광효율을 향상시키는 반사판(reflector;17)과, 상기 램프(11)로부터 방출된 광을 액정패널(3)로 균일하게 입사시키는 광학시트(15)로 구성된다.The backlight 10 is a direct type backlight, which is located under the liquid crystal panel 3 to emit light, and emits light from the lamp 11 and supplies the light to the liquid crystal panel 3. A reflector 17 reflects light to improve light efficiency, and an optical sheet 15 uniformly injects the light emitted from the lamp 11 into the liquid crystal panel 3.

상기와 같이 백라이트(10)로부터 출력된 광은 액정패널(3)에 부착된 제1편광판(16a)를 투고하면서 특정 편광방향의 광만이 액정패널(3)에 공급된다. 도면에서 도면부호 16b는 액정패널(3)에 부착된 제2편광판으로 액정패널(3)을 투과하는 광중에서 특정 편광방향을 갖는 광만을 투과시킨다.As described above, the light output from the backlight 10 passes through the first polarizing plate 16a attached to the liquid crystal panel 3, and only light in a specific polarization direction is supplied to the liquid crystal panel 3. In the drawing, reference numeral 16b denotes a second polarizing plate attached to the liquid crystal panel 3 to transmit only light having a specific polarization direction among the light passing through the liquid crystal panel 3.

통상적으로 램프(11)에서 발광된 광은 액정패널(3)의 하부에 부착된 제1편광판(16a)을 투과하면 상기 제1편광판(16a)에 의해 광손실이 발생하게 되어 입사된 광의 약 50％만이 투과하게 되어, 휘도가 저하되는 문제가 있었다.Typically, when the light emitted from the lamp 11 passes through the first polarizing plate 16a attached to the lower portion of the liquid crystal panel 3, light loss is generated by the first polarizing plate 16a, and thus about 50 of the incident light is emitted. Only% was transmitted and there was a problem that the luminance was lowered.

본 발명은 상기한 문제를 해결하기 위한 것으로, 집광판이 일체로 형성된 반사형 편광판을 사용하여 광손실을 최소화할 수 있는 반사형 편광판구조를 제공하는 것을 목적으로 한다.The present invention is to solve the above problems, an object of the present invention is to provide a reflective polarizing plate structure that can minimize the light loss by using a reflective polarizing plate formed integrally.

본 발명의 다른 목적은 집광판을 렌즈형상으로 형성함으로써 집광판에 의한 편광의 깨짐현상이나 불연속적인 스펙트럼분산을 방지할 수 있는 반사형 편광판구조를 제공하는 것이다.Another object of the present invention is to provide a reflective polarizing plate structure which can prevent the breakage of polarization and discontinuous spectral dispersion by the light collecting plate by forming the light collecting plate in a lens shape.

본 발명의 또 다른 목적은 상기와 같은 반사형 편광판을 구비함으로써 휘도를 향상시키고 두께를 감소할 수 있는 액정표시소자를 제공하는 것이다.Still another object of the present invention is to provide a liquid crystal display device capable of improving brightness and reducing thickness by providing the reflective polarizing plate as described above.

상기한 목적을 달성하기 위해, 본 발명에 따른 액정표시소자는 액정패널; 상기 액정패널에 광을 공급하는 적어도 하나의 램프; 상기 액정패널 및 램프 사이에 설치되어 램프로부터 발광되어 하면으로 입사되는 광은 확산시키고 상면으로 입사되는 광은 다시 상부로 반사시키는 확산판; 및 상기 액정패널과 확산판 사이에 배치되어 확산판에 의해 확산된 광중에서 편광축과 평행한 편광방향의 광은 투과하고 다른 편광방향의 광은 반사시키는 확산판으로 반사시키며, 렌즈형 집광판이 구비되어 투과되는 광을 집광하는 반사형 편광판으로 구성되며,
상기 반사형 편광판에서 반사된 광은 확산판에 의해 반사되어 그 편광상태가 변경된 상태로 다시 반사형 편광판으로 입사되어 편광축과 평행한 편광방향의 광은 투과하고 다른 편광방향의 광은 반사시키는 것을 특징으로 한다.In order to achieve the above object, the liquid crystal display device according to the present invention comprises a liquid crystal panel; At least one lamp supplying light to the liquid crystal panel; A diffusion plate disposed between the liquid crystal panel and the lamp to emit light from the lamp to diffuse light incident on the lower surface and reflect light incident on the upper surface to the upper side; And a diffuser disposed between the liquid crystal panel and the diffuser plate to reflect the diffused plate that transmits light in a polarization direction parallel to the polarization axis and reflects light in the other polarization direction among the light diffused by the diffuser plate. Consists of a reflective polarizer for collecting the transmitted light,
The light reflected from the reflective polarizer is reflected by the diffuser and is incident to the reflective polarizer again in a state in which the polarization state is changed, thereby transmitting light in a polarization direction parallel to the polarization axis and reflecting light in another polarization direction. It is done.

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본 발명에서는 액정패널로 입사되는 광의 손실을 최소화하기 위해 반사형 편광판을 이용한다. 반사형 편광판은 일반적인 투과형 편광필름에 반사특성이 좋은 금속이 증착된 필름을 부착한 것으로, 편광판과 편광축이 평행한 편광방향의 광은 투과시키고 다른 편광방향의 광은 반사시키는 특성을 가진다. 본 발명에서는 이러한 반사형 편광판을 이용하여 편광판에서 반사된 광을 확산판에서 다시 편광판으로 반사시켜 액정층에 공급함으로써 광손실을 최소화하고 휘도저하를 방지하는 것이다. 특히, 본 발명에서는 반사형 편광판과 집광판을 일체로 형성함으로써 집광특성을 더욱 향상시키고 액정표시소자의 크기를 감소할 수 있게 된다.In the present invention, a reflective polarizer is used to minimize the loss of light incident on the liquid crystal panel. Reflective polarizing plate is a film in which a metal having good reflecting properties is deposited on a general transmissive polarizing film, and has a property of transmitting light in a polarization direction parallel to the polarizing plate and a polarization axis and reflecting light in another polarization direction. In the present invention, by using the reflective polarizing plate, the light reflected from the polarizing plate is reflected from the diffuser back to the polarizing plate and supplied to the liquid crystal layer to minimize light loss and prevent luminance decrease. In particular, in the present invention, by integrally forming the reflective polarizing plate and the light collecting plate, the light condensing characteristics can be further improved and the size of the liquid crystal display device can be reduced.

이하, 첨부한 도면을 참조하여 본 발명에 따른 액정표시소자에 대해 상세히 설명한다.Hereinafter, a liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 제1실시예에 따른 액정표시소자의 구조를 간략하게 나타내는 개념도이다.2 is a conceptual diagram briefly illustrating a structure of a liquid crystal display device according to a first embodiment of the present invention.

도 2에 도시된 바와 같이, 본 발명에 따른 액정표시소자는 신호가 입력됨에 따라 화상을 구현하는 액정패널(103)과, 상기 액정패널(103)의 하부에 위치하여 상기 액정패널(103)에 광을 공급하는 램프(111)와, 상기 램프(111)로부터 발광된 광을 확산시켜 액정패널(103)에 균일한 광을 공급하는 확산판(115)과, 상기 액정패널(103)의 하부에 위치하여 확산판(215)에서 확산되어 입사되는 광을 편광시키고 투과되는 광을 집광하는 편광판(116)으로 구성된다.As shown in FIG. 2, the liquid crystal display device according to the present invention includes a liquid crystal panel 103 that implements an image as a signal is input, and a lower portion of the liquid crystal panel 103 disposed on the liquid crystal panel 103. A lamp 111 for supplying light, a diffusion plate 115 for diffusing light emitted from the lamp 111 to supply uniform light to the liquid crystal panel 103, and a lower portion of the liquid crystal panel 103. And a polarizing plate 116 positioned to polarize the incident light diffused by the diffuser plate 215 and to collect the transmitted light.

도면에는 자세히 도시하지 않았지만, 상기 액정패널(103)은 박막트랜지스터와 같은 각종 어레이가 형성되는 제1기판(103a)과, 컬러필터층이 형성되는 제2기판(103b)과, 상기 제1기판(103a) 및 제2기판(103b) 사이에 형성된 액정층(103c)으로 구성되어, 화상신호가 입력됨에 따라 상기 램프(111)로부터 입력되는 광의 투과 율을 조절함으로써 원하는 화상을 구현한다.Although not shown in detail, the liquid crystal panel 103 includes a first substrate 103a on which various arrays such as a thin film transistor are formed, a second substrate 103b on which a color filter layer is formed, and the first substrate 103a. ) And the liquid crystal layer 103c formed between the second substrate 103b, and realize a desired image by adjusting the transmittance of light input from the lamp 111 as the image signal is input.

상기 편광판(116)은 반사형 편광판으로 일반적인 투과형 편광판에 반사특성이 좋은 필름을 형성한 것으로서, 편광판(116)의 편광축과 평행한 편광방향의 광은 투과하고 다른 편광방향의 광은 반사한다.The polarizing plate 116 is a reflective polarizing plate formed of a film having good reflection characteristics in a general transmissive polarizing plate. The polarizing plate 116 transmits light in a polarization direction parallel to the polarization axis of the polarizing plate 116 and reflects light in another polarization direction.

상기 편광판(116)에 의해 반사된 광, 즉 편광판(116)의 편광축방향과는 다른 편광방향을 갖는 광은 상기 편광판(116)에서 반사된 후 다시 확산판(215)에 의해 일부가 반사되어 편광판(116)으로 입사된다. 이때, 상기 확산판(215)에서 반사된 광은 그 편광방향이 반전된다. 따라서, 확산판(215)에서 반사되어 편광방향이 반전된 광의 일부(즉, 편광판(116)의 편광축방향과 평행한 광)는 편광판(116)을 투과하고 나머지가 다시 확산판(215)으로 반사된다. 이와 같이, 편광판(116)과 확산판(115) 사이의 반사에 의해 최초에 편광판(116)을 투과하는 광 이외의 광도 편광판(116)을 투과할 수 있게 된다. 통상적으로, 투과형 편광판을 사용하는 경우 50％의 광만이 편광판(116)을 투과하는데 반해, 본 발명과 같이 반사형 편광판(116)을 사용하는 경우 약 80％이 광이 편광판(116)을 투과하게 된다. 따라서, 종래의 액정표시소자비해 광효율이 향상되어 휘도를 향상시킬 수 있을 뿐만 아니라 작은 전압에 의해서도 원하는 양의 광을 액정패널(103)로 공급할 수 있게 되므로 램프(111)에 인가되는 전력을 대폭 감소할 수 있게 된다. 이와 같이, 램프(111)에 인가되는 전압을 감소함에 따라 액정표시소자에서 필요로 하는 전력을 감소할 수 있게 된다.The light reflected by the polarizing plate 116, that is, light having a polarization direction different from the polarization axis direction of the polarizing plate 116 is reflected by the polarizing plate 116, and then partially reflected by the diffuser plate 215, and thus the polarizing plate Incident at 116. At this time, the polarization direction of the light reflected by the diffusion plate 215 is reversed. Therefore, a part of the light reflected by the diffuser plate 215 and the polarization direction is inverted (that is, light parallel to the polarization axis direction of the polarizer 116) passes through the polarizer 116 and the other is reflected back to the diffuser plate 215. do. As described above, the light between the polarizer 116 and the diffuser plate 115 can transmit light other than the light that first passes through the polarizer 116 through the polarizer 116. Typically, only 50% of the light is transmitted through the polarizer 116 when using the transmissive polarizer, whereas about 80% of the light is transmitted through the polarizer 116 when using the reflective polarizer 116 as in the present invention. do. Therefore, the light efficiency is improved as compared with the conventional liquid crystal display device, and thus the luminance can be improved, and since the desired amount of light can be supplied to the liquid crystal panel 103 even by a small voltage, the power applied to the lamp 111 is greatly reduced. You can do it. As described above, as the voltage applied to the lamp 111 is decreased, power required by the liquid crystal display device may be reduced.

한편, 상기 편광판(116)에는 집광판(117)이 일체로 형성된다. 즉, 편광판(116)을 투과하는 광을 집광하는 프리즘형상의 집광판(117)을 편광판(116) 위에 일체로 형성하는 것이다. 이와 같이, 집광판(117)을 편광판(116) 상부에 형성함에 따라 상기 편광판(116)으로 입사되어 투과되는 광이 상기 집광판(117)의 표면에서 집광하여 액정패널(103) 정면으로 광을 공급한다.Meanwhile, the light collecting plate 117 is integrally formed on the polarizing plate 116. In other words, a prism-shaped light collecting plate 117 for collecting light passing through the polarizing plate 116 is integrally formed on the polarizing plate 116. As such, as the light collecting plate 117 is formed on the polarizing plate 116, the light incident and transmitted through the polarizing plate 116 is collected on the surface of the light collecting plate 117 to supply light to the front of the liquid crystal panel 103. .

이와 같이, 집광판(117)을 반사형 편광판(116)에 일체로 형성함에 따라 집광판(117)이 공간을 사이에 두고 별도로 배치되던 종래의 액정표시소자에 비해, 집광효율을 향상시킬 수 있을 뿐만 아니라 액정표시소자의 크기를 감소할 수 있게 된다.As such, as the light collecting plate 117 is integrally formed on the reflective polarizing plate 116, the light collecting efficiency of the light collecting plate 117 may be improved as compared with a conventional liquid crystal display device in which the light collecting plate 117 is disposed separately with a space therebetween. The size of the liquid crystal display device can be reduced.

도 4는 본 발명의 제2실시예에 따른 액정표시소자의 구조를 개념적으로 나타내는 도면이다. 이 실시예의 액정표시소자와 제1실시예의 액정표시소자의 구조상의 차이는 단지 반사형 편광판(216)에 일체로 형성되는 집광판(217)뿐이다. 따라서, 제1실시예와 동일한 구조에 대해서는 설명을 생략하고 상기와 같은 집광(217)에 대해서만 설명한다.4 is a diagram conceptually showing a structure of a liquid crystal display device according to a second exemplary embodiment of the present invention. The structural difference between the liquid crystal display element of this embodiment and the liquid crystal display element of the first embodiment is only the light collecting plate 217 integrally formed on the reflective polarizing plate 216. Therefore, the same structure as that of the first embodiment is omitted, and only the light condensing 217 described above will be described.

도 4에 도시된 바와 같이, 이 실시예의 집광판(217)은 그 형상이 렌즈형상으로 이루어져 있는데, 이와 같이 이 실시예에서 집광판(217)의 모양을 렌즈형상으로 형성한 것은 다음과 같은 이유 때문이다.As shown in Fig. 4, the light collecting plate 217 of this embodiment has a lens shape. The reason for forming the light collecting plate 217 in this embodiment in the form of a lens is as follows. .

도 3에 도시된 바와 같이, 제1실시예에서 삼각형상(또는 프리즘형상)의 집광판(117)을 사용하는 경우, 편광판(116)에 의해 편광된 광의 편광이 상기 프리즘 형상의 집광판(117)에 의해 다시 편광되어 원래의 편광상태가 깨지게 된다. 이와 같이 편광상태가 깨진 광은 상기 집광판(117)을 투과하면서 다시 광손실이 발생하므로, 원래의 광손실 방지효과가 저하된다. 더욱이, 프리즘의 형상의 집광판(117)을 투과하는 광이 프리즘의 광학적인 특성에 의해 불연속적인 스펙트럼분산이 발생하게 되어 액정표시소자의 색재현이 불량으로 된다.As shown in FIG. 3, in the case of using the triangular (or prism-shaped) light collecting plate 117 in the first embodiment, the polarization of light polarized by the polarizing plate 116 is applied to the light collecting plate 117 of the prism shape. By the polarization again, the original polarization state is broken. As the light is broken in this way, the light loss occurs again while passing through the light collecting plate 117, and thus the original light loss prevention effect is reduced. In addition, the light transmitted through the light collecting plate 117 in the shape of the prism causes discontinuous spectral dispersion due to the optical characteristics of the prism, resulting in poor color reproduction of the liquid crystal display device.

제2실시예는 집광판(217)에 의한 광손실을 방지하고 불연속적인 스펙트럼분산에 의한 색재현의 불량을 방지하기 위한 것으로, 프리즘형상 대신 렌즈형상의 집광판(217)을 편광판(216)에 일체로 형성함으로써 상기와 같은 목적을 달성하는 것이다.The second embodiment is to prevent light loss caused by the light collecting plate 217 and to prevent color reproduction defect due to discontinuous spectral dispersion, and instead of the prism shape, the lens-shaped light collecting plate 217 is integrated into the polarizing plate 216. By forming, the above object is achieved.

도 4에 도시된 바와 같이, 이 실시예에서는 집광판(217)을 뒤집어진 U자형의 렌즈형상으로 형성하기 때문에, 편광판(216)을 투과하면서 편광된 광이 상기 집광판(217)에 의해 다시 편광되지 않으므로, 광이 상기 집광판(217)을 투과하면서 편광상태가 깨지는 것을 방지할 수 있게 된다.As shown in FIG. 4, in this embodiment, since the light collecting plate 217 is formed in an inverted U-shaped lens shape, light polarized while passing through the polarizing plate 216 is not polarized again by the light collecting plate 217. Therefore, it is possible to prevent the polarization state from being broken while light passes through the light collecting plate 217.

한편, 렌즈형 집광판(217)의 하부, 즉 집광판(217)과 편광판(216)의 사이에는 반사부(218)가 형성된다. 상기 반사부(218)는 도 5에 도시된 바와 같이 집광판(217)과 편광판(216)의 사이의 집광판(217) 렌즈의 경계영역에 형성되어 상기 집광판(217)으로 임계 각도 이상으로 입사되는 광을 반사시킨다. 또한, 반사형 편광판(216)의 하면에는 반사율이 좋은 반사필름이 형성되어 있기 때문에, 상기 반사부(218)에서 편광판(216)의 하면으로 반사된 광이 다시 상기 편광판(216)의 하면에서 반사되어 집광판(217)으로 입사된다. 이때, 편광판(218)의 하면에서 반사되는 광의 경로는 최초의 경로와는 변하게 되어, 집광판(217) 내부로 임계 각도 이하도 입사되는 것이다. 이와 같이, 본 발명의 제2실시예에 따른 액정표시소자에서는 모든 광이 임계 각도 이하로 집광판(217)으로 입사되기 때문에, 집광판(217)으로 입 사되는 광이 모두 표면에서 굴절되어 액정패널(203)로 집광되어 공급된다.On the other hand, a reflecting portion 218 is formed under the lens-shaped light collecting plate 217, that is, between the light collecting plate 217 and the polarizing plate 216. As shown in FIG. 5, the reflector 218 is formed at a boundary area of the lens of the light collecting plate 217 between the light collecting plate 217 and the polarizing plate 216 and is incident on the light collecting plate 217 at a critical angle or more. Reflects. In addition, since a reflective film having a high reflectance is formed on the bottom surface of the reflective polarizer 216, light reflected from the reflector 218 to the bottom surface of the polarizer 216 is reflected back from the bottom surface of the polarizer 216. And enters the light collecting plate 217. At this time, the path of the light reflected from the lower surface of the polarizing plate 218 is changed from the first path, so that even below the critical angle is incident into the light collecting plate 217. As described above, in the liquid crystal display according to the second exemplary embodiment of the present invention, since all light is incident on the light collecting plate 217 at a critical angle or less, all the light incident on the light collecting plate 217 is refracted at the surface and thus the liquid crystal panel ( 203) to be focused and supplied.

상기 반사부(218)의 폭과 간격은 집광판(217)의 렌즈형상의 곡률과 따라 달라진다. 즉, 집광판(217)이 편광판(216)으로 입사되는 광을 집광하여 액정패널(203)로 효율적으로 공급할 수 있도록 상기 반사부(218)의 폭과 간격 및 집광판(217)의 곡률을 설계해야만 한다는 것이다. 상기 반사부(218)는 금속이나 그 이외의 반사특성이 좋은 물질을 편광판(216) 또는 집광판(217)의 표면에 부착하거나 적층하는 다양한 방법에 의해 형성할 수 있을 것이다. 또한, 상기 반사부(218)는 타이타늄옥사이드(SrTi03)나 알루미늄옥사이드(Al2O3) 등의 금속산화물로 이루어질 수도 있을 것이다.The width and the spacing of the reflector 218 vary depending on the curvature of the lens shape of the light collecting plate 217. That is, the width and spacing of the reflector 218 and the curvature of the light collecting plate 217 must be designed so that the light collecting plate 217 can collect the light incident on the polarizing plate 216 and efficiently supply the light to the liquid crystal panel 203. will be. The reflector 218 may be formed by various methods of attaching or stacking a metal or other materials having good reflective properties to the surface of the polarizing plate 216 or the light collecting plate 217. In addition, the reflector 218 may be made of a metal oxide such as titanium oxide (SrTi0 3 ) or aluminum oxide (Al 2 O 3 ).

상기와 같이, 본 발명에 따른 제2실시예의 액정표시소자에서는 집광판(217) 자체에 의한 편광에 의해 편광판(216)에서 편광된 광의 편광이 깨져 광손실이 발생하는 것을 방지할 수 있을 뿐만 아니라 불연속적인 스펙트럼분산에 의해 색재현율이 저하되는 것을 방지할 수 있게 된다. 또한, 프리즘형상의 집광판에 비해 반치각특성도 향상된다.As described above, in the liquid crystal display device according to the second embodiment of the present invention, the polarization of the light polarized by the polarizing plate 216 is broken by the polarization of the light collecting plate 217 itself, thereby preventing the light loss from occurring and discontinuously. It is possible to prevent the color reproducibility from being lowered due to the spectral dispersion. In addition, the half angle characteristic is also improved as compared with the prism-shaped light collecting plate.

한편, 도 4에 도시된 렌즈형상의 집광판(217)은 뒤집어진 U자의 렌즈형상을 이루고 있지만, 본 발명이 이러한 형상에만 한정되는 것은 아니다. 예를 들어, 볼록렌즈형상과 같은 렌즈형상도 본 발명에 적용될 수 있을 것이다. 이러한 집광판(217)의 설계는 앞서서 설명한 바와 같이, 반사부(218)의 폭이나 간격에 따라 다양한 형태로 설계될 수 있을 것이다.On the other hand, the lens-shaped light collecting plate 217 shown in Fig. 4 forms an inverted U-shaped lens shape, but the present invention is not limited to this shape. For example, a lens shape such as a convex lens shape may be applied to the present invention. As described above, the design of the light collecting plate 217 may be designed in various forms according to the width or spacing of the reflector 218.

또한, 상술한 설명에서는 액정패널의 하부에 위치하여 액정패널에 광을 직접 공급하는 직하형 액정패널에 대해서만 설명하고 있지만, 이는 설명의 편의를 위한 것이지 본 발명을 특정짓는 것은 아니다. 본 발명은 액정표시소자의 일측면 또는 양측면에 램프가 설치되어 램프로부터 발광된 광이 도광판을 통해 인도되어 액정패널로 광이 공급되는 측면형 액정표시소자에도 적용될 수 있을 것이다. In addition, in the above description, only the direct type liquid crystal panel positioned below the liquid crystal panel and directly supplying light to the liquid crystal panel is described, but this is for convenience of description and does not specify the present invention. The present invention may be applied to a side type liquid crystal display device in which a lamp is installed on one side or both sides of the liquid crystal display device, and the light emitted from the lamp is guided through the light guide plate to supply light to the liquid crystal panel.

또한, 본 발명의 반사형 편광판은 단지 액정표시소자에만 한정되는 것이 아니라, 편광된 광이 입사됨으로써 화상을 구현할 수 있는 모든 종류의 표시패널에 적용될 수도 있을 것이다.In addition, the reflective polarizer of the present invention is not limited to the liquid crystal display device, but may be applied to all kinds of display panels capable of realizing an image by incident polarized light.

따라서, 본 발명의 권리의 범위는 상기한 상세한 설명에 의해 결정되는 것이 아니라 첨부한 특허청구범위에 의해 결정되어야만 할 것이다.Accordingly, the scope of the present invention should be determined not by the above detailed description, but by the appended claims.

상술한 바와 같이, 본 발명에서는 반사형 편광판을 사용하므로 액정패널에 입사되는 광의 손실을 최소화하여 휘도를 향상시키고 전력의 소모를 최소화할 수 있게 된다.As described above, since the reflective polarizer is used in the present invention, it is possible to minimize the loss of light incident on the liquid crystal panel, thereby improving luminance and minimizing power consumption.

또한, 본 발명에서는 렌즈형상의 집광판을 편광판과 일체로 형성하므로, 액정패널로 입사되는 광의 집광특성을 향상시킬 수 있을 뿐만 아니라 액정표시소자의 두께를 감소할 수 있게 된다.Further, in the present invention, since the lens-shaped light collecting plate is integrally formed with the polarizing plate, the light collecting characteristic of the light incident on the liquid crystal panel can be improved and the thickness of the liquid crystal display device can be reduced.

Claims (16)

삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 액정패널;A liquid crystal panel; 상기 액정패널에 광을 공급하는 적어도 하나의 램프;At least one lamp supplying light to the liquid crystal panel; 상기 액정패널 및 램프 사이에 설치되어 램프로부터 발광되어 하면으로 입사되는 광은 확산시키고 상면으로 입사되는 광은 다시 상부로 반사시키는 확산판; 및A diffusion plate disposed between the liquid crystal panel and the lamp to emit light from the lamp to diffuse light incident on the lower surface and reflect light incident on the upper surface to the upper side; And 상기 액정패널과 확산판 사이에 배치되어 확산판에 의해 확산된 광중에서 편광축과 평행한 편광방향의 광은 투과하고 다른 편광방향의 광은 반사시키는 확산판으로 반사시키며, 렌즈형 집광판이 구비되어 투과되는 광을 집광하는 반사형 편광판으로 구성되며,Disposed between the liquid crystal panel and the diffuser plate and reflected by a diffuser plate that transmits light in a polarization direction parallel to the polarization axis and reflects light in another polarization direction among light diffused by the diffuser plate, and a lens-shaped light collecting plate is provided to transmit the light. Consists of a reflective polarizer for condensing light 상기 반사형 편광판에서 반사된 광은 확산판에 의해 반사되어 그 편광상태가 변경된 상태로 다시 반사형 편광판으로 입사되어 편광축과 평행한 편광방향의 광은 투과하고 다른 편광방향의 광은 반사시키는 것을 특징으로 하는 액정표시소자.The light reflected from the reflective polarizer is reflected by the diffuser and is incident to the reflective polarizer again in a state in which the polarization state is changed, thereby transmitting light in a polarization direction parallel to the polarization axis and reflecting light in another polarization direction. Liquid crystal display device. 삭제delete 제9항에 있어서, 상기 편광판의 렌즈형상의 경계에 형성되어 임계 각도 이상으로 입력되는 광을 반사시키는 반사부를 추가로 포함하는 것을 특징으로 하는 액정표시소자.10. The liquid crystal display device according to claim 9, further comprising a reflector formed at a boundary of the lens shape of the polarizing plate and reflecting light input at a critical angle or more. 제11항에 있어서, 상기 반사부는 금속으로 이루어진 것을 특징으로 하는 액정표시소자.12. The liquid crystal display device according to claim 11, wherein the reflector is made of metal. 제11항에 있어서, 상기 반사부에 의해 반사된 광은 편광판의 하면에서 반사되어 임계 각도 이하로 집광판에 입사되는 것을 특징으로 하는 액정표시소자.The liquid crystal display device of claim 11, wherein the light reflected by the reflecting unit is reflected from a lower surface of the polarizing plate and incident on the light collecting plate at a critical angle or less. 제9항에 있어서, 상기 집광판은 뒤집어진 U자형 렌즈형상으로 이루어진 것을 특징으로 하는 액정표시소자.10. The liquid crystal display device according to claim 9, wherein the light collecting plate has an inverted U-shaped lens shape. 제9항에 있어서, 상기 집광판의 곡률은 반사부의 폭과 간격에 따라 달라지는 것을 특징으로 하는 액정표시소자.The liquid crystal display device according to claim 9, wherein the curvature of the light collecting plate is varied depending on the width and the spacing of the reflector. 삭제delete
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JPH10170707A (en) * 1996-12-06 1998-06-26 Unitika Ltd Reflection sheet for polarizing plate
KR20050106634A (en) * 2004-05-06 2005-11-11 삼성전자주식회사 Diffuser with integrated prism sheet and manufacturing method thereof
KR20060023452A (en) * 2004-09-09 2006-03-14 삼성전자주식회사 Prism sheet, backlight assembly and liquid crystal display apparatus having the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10170707A (en) * 1996-12-06 1998-06-26 Unitika Ltd Reflection sheet for polarizing plate
KR20050106634A (en) * 2004-05-06 2005-11-11 삼성전자주식회사 Diffuser with integrated prism sheet and manufacturing method thereof
KR20060023452A (en) * 2004-09-09 2006-03-14 삼성전자주식회사 Prism sheet, backlight assembly and liquid crystal display apparatus having the same

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