KR100400004B1 - Backlight for flat display device - Google Patents

Backlight for flat display device Download PDF

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Publication number
KR100400004B1
KR100400004B1 KR10-2001-0023226A KR20010023226A KR100400004B1 KR 100400004 B1 KR100400004 B1 KR 100400004B1 KR 20010023226 A KR20010023226 A KR 20010023226A KR 100400004 B1 KR100400004 B1 KR 100400004B1
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KR
South Korea
Prior art keywords
light
guide plate
backlight
light guide
light source
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KR10-2001-0023226A
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Korean (ko)
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KR20020083681A (en
Inventor
민지홍
최환영
이문규
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삼성전자주식회사
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Priority to KR10-2001-0023226A priority Critical patent/KR100400004B1/en
Publication of KR20020083681A publication Critical patent/KR20020083681A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

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

Abstract

홀로그램을 사용한 평면표시소자용 백라이트가 개시된다.Disclosed is a backlight for a flat panel display device using a hologram.

액정디스플레이(LCD)와 같은 평판 디스플레이에서 광원으로 사용되고 있는 백라이트에 관한 것으로, 도광판 바닥에 홀로그램이 구비되어 있다. 광 반사효율을 증가시킬 수 있고, 이와 관련된 부품 수를 줄일 수 있어 구조가 간단하다.The present invention relates to a backlight used as a light source in a flat panel display such as a liquid crystal display (LCD). A hologram is provided at the bottom of the light guide plate. The light reflection efficiency can be increased, and the number of related parts can be reduced, resulting in a simple structure.

Description

평면표시소자용 백라이트{Backlight for flat display device}Backlight for flat display device

본 발명은 평면표시소자용 백라이트에 관한 것으로, 상세하게는 홀로그램The present invention relates to a backlight for a flat panel display device, and more particularly to a hologram

(제 2 광원)이 구비된 도광판을 포함하는 평면표시소자용 백라이트에 관한 것이다.The present invention relates to a backlight for a flat panel display device including a light guide plate provided with a (second light source).

일반적으로 백라이트는 액정 디스플레이(LCD)와 같은 평판 디스플레이에서 광원으로 사용되는 것이다. 광원은 액정 디스플레이와 같은 피조명부에 광을 균일하게 조사하면서 광 반사효율을 증대시킬 수 있어야 한다.In general, the backlight is used as a light source in a flat panel display such as a liquid crystal display (LCD). The light source should be able to increase the light reflection efficiency while uniformly irradiating the light to the illuminated part such as the liquid crystal display.

종래의 백라이트는 도 1에 도시된 바와 같이 제 1 광원(11)과 상기 제 1 광원(11)으로부터 조사되는 광이 통과하는 도광판(13)과 상기 도광판(13)에서 방출되는 광을 확산시키는 확산판(19)과 확산되어 나오는 광을 정면에 모아주는 프리즘판(21)과 이를 보호하는 보호판(23)을 구비한다.As shown in FIG. 1, a conventional backlight diffuses a light guide plate 13 through which light emitted from the first light source 11 and the first light source 11 passes and diffuses light emitted from the light guide plate 13. The plate 19 and the prism plate 21 for collecting the diffused light to the front and a protective plate 23 for protecting it.

또한, 광 반사효율을 증대시키기 위하여 도광판 상에 산란용 도트 패턴이나 프리즘 형태 또는 반구 형태의 요철(15)을 구비한다.Further, in order to increase the light reflection efficiency, a scattering dot pattern, a prism shape, or a hemispherical shape irregularity 15 is provided on the light guide plate.

도광판 상에 프리즘 형태 또는 반구 형태의 요철을 구비하는 경우는 실제 공정에서 그 비용 및 시간의 손실이 많게 된다.In the case of providing the prism or hemispherical irregularities on the light guide plate, the cost and time are lost in the actual process.

또한 도광판 상에 산란용 도트 패턴을 인쇄하는 경우 도광판에 인쇄된 도트 패턴은 LCD 패널과 조립되었을 시 화상면의 각 화소에 무늬가 있는 것처점 나타나 시인성을 악화시킨다. 이러한 시인성 문제를 해결하기 위해 적용된 확산판은 그 투과 성능에 따라 다시 20 내지 30%의 광 반사효율의 저하를 가져오게 된다.In addition, in the case of printing the scattering dot pattern on the light guide plate, the dot pattern printed on the light guide plate appears to have a pattern on each pixel of the image surface when assembled with the LCD panel, thereby deteriorating visibility. Diffusion plate applied to solve this visibility problem is to bring back the light reflection efficiency of 20 to 30% again depending on the transmission performance.

본 발명은 상기한 바와 같은 종래 기술의 문제점을 개선하기 위한 것으로,광 반사효율을 증가시키면서도 구성을 단순화시킨 백라이트를 제공하는데 그 목적이 있다.The present invention is to improve the problems of the prior art as described above, the object is to provide a backlight with a simplified configuration while increasing the light reflection efficiency.

도 1은 종래의 백라이트 시스템의 일 예를 개략적으로 보인 도면이다.1 is a view schematically showing an example of a conventional backlight system.

도 2는 본 발명의 일 실시예에 따른 백라이트 시스템의 구성을 개략적으로 보인 도면이다.2 is a view schematically illustrating a configuration of a backlight system according to an embodiment of the present invention.

도 3은 도 2에서 사용된 홀로그램을 기록하기 위한 장치의 개략적인 도면이다.FIG. 3 is a schematic diagram of an apparatus for recording the hologram used in FIG. 2.

*도면의 주요 부분에 대한 부호설명** Description of Signs of Major Parts of Drawings *

11 제 1 광원 13 도광판11 First light source 13 Light guide plate

15 산란패턴 17 반사판15 Scattering Patterns 17 Reflectors

19 확산판 21 프리즘판19 Diffusion Plate 21 Prism Plate

23 보호판 25 제 2 광원(홀로그램)23 Shield 25 25 Second light source (hologram)

27 참조광 29 홀로그램마스터27 Reference Light 29 Hologram Master

31 물체광 33 물체31 Object Light 33 Object

35 광원35 light source

상기 기술적 과제를 달성하기 위하여, 본 발명은 도광판;과 상기 도광판의 측면에 구비된 제 1 광원;과 상기 도광판의 바닥의 전면에 구비되고 상기 제 1 광원으로부터 입사하는 광을 참조광으로 하여 30도 이상의 출사각도로 광을 방출시는 제 2 광원;을 포함하는 것을 특징으로 하는 평면표시소자용 백라이트를 제공한다.In order to achieve the above technical problem, the present invention is a light guide plate; and a first light source provided on the side of the light guide plate; and the light incident on the front surface of the bottom of the light guide plate and the incident light from the first light source 30 degrees or more as a reference light It provides a backlight for a flat panel display device comprising a; a second light source for emitting light at the exit angle.

상기 제 2 광원은 홀로그램이다.The second light source is a hologram.

상기 평면표시소자용 백라이트에서 상기 도광판의 바닥에 광을 반사시키는 반사판;과 상기 도광판의 앞면에서 방출되는 광을 모아주는 프리즘판;과 상기 프리즘판의 앞면에 위치한 보호판;이 더 포함될 수 있다.A reflective plate for reflecting light to the bottom of the light guide plate in the backlight for the flat panel display device, and a prism plate for collecting light emitted from the front surface of the light guide plate; and a protective plate located on the front surface of the prism plate.

이와 같은 본 발명은 도광판 바닥에 홀로그램을 사용한 패턴이 형성되어 광 효율을 증가시키고 전면에 걸쳐 균일한 광 분포를 얻을 수 있다.In the present invention, a pattern using a hologram is formed at the bottom of the light guide plate to increase light efficiency and obtain a uniform light distribution over the entire surface.

이하, 본 발명의 실시예에 의한 평면표시소자용 백라이트를 첨부된 도면들을 참조하여 상세하게 설명한다.Hereinafter, a backlight for a flat panel display device according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2를 참조하면, 평면표시소자용 백라이트는 도광판(13)의 측면에 제 1 광원(11)이 구비되어 있다. 상기 제 1 광원(11)에서 조사된 광은 상기 도광판(13)의 바닥에 조사되며 전반사에 의해 전달된다. 상기 도광판(13)의 바닥의 전면에 홀로그램(25)이 구비되어 있다. 상기 홀로그램(25)은 상기 제 1 광원(11)으로부터 입사하는 광을 상기 도광판(13) 앞면으로 30도(deg) 이상의 각도로 방출시킨다. 상기 도광판(13)의 바닥에는 반사판(17)을 더 구비하여 광이 투과되지 않도록 한다. 상기 도광판(13)의 앞면에는 프리즘판(21)을 더 구비할 수 있다. 상기 프리즘판(21)은 그 방향에 따라서 한 장 또는 90도 각도로 이루어진 두 장으로 구성되어 상기 도광판(13)에서 30°이상으로 출사각으로 방출되는 광을 정면으로 모아준다. 상기 도광판(13)에서 나오는 광은 프리즘판(21)을 사용할 시에는 약 45도 각도로 방출되도록 한다. 프리즘판(21)에 입사된 광이 이 각도에서 정면으로 방출될 수 있기 때문이다. 상기 프리즘판(21)의 앞면에 보호판(23)을 더 구비할 수 있다.Referring to FIG. 2, a backlight for a flat panel display device includes a first light source 11 on a side surface of the light guide plate 13. The light irradiated from the first light source 11 is irradiated to the bottom of the light guide plate 13 and is transmitted by total reflection. The hologram 25 is provided on the front surface of the bottom of the light guide plate 13. The hologram 25 emits light incident from the first light source 11 to the front surface of the light guide plate 13 at an angle of 30 degrees or more. The bottom of the light guide plate 13 is further provided with a reflecting plate 17 to prevent light from being transmitted. The front surface of the light guide plate 13 may further include a prism plate 21. The prism plate 21 is composed of one sheet or two sheets formed at an angle of 90 degrees according to the direction to collect light emitted from the light guide plate 13 at an exit angle of 30 ° or more to the front. The light emitted from the light guide plate 13 is emitted at an angle of about 45 degrees when the prism plate 21 is used. This is because light incident on the prism plate 21 can be emitted to the front at this angle. A protective plate 23 may be further provided on the front surface of the prism plate 21.

도 3은 도 2에서 사용된 홀로그램을 기록하기 위한 장치가 개략적으로 도시되어 있다. 광원(35)에서 물체(33)를 향해 조사된 광은 물체에서 산란되어 물체광(31)으로 생성되고 상기 물체광(31)은 홀로그램마스터(29)를 향해 입사된다. 참조광(27)은 기준광으로서 홀로그램마스터에 입사되어 상기 물체광(31)과 상기 참조광(27)의 간섭현상에 의해 상기 물체(33)에 관한 정보가 홀로그램마스터(29)에 기록되게 된다. 정보가 상기 홀로그램마스터(29)에 기록되어 생성된 것이 본 발명의 도광판에 사용되는 홀로그램(25)이 된다. 본 발명에서는 종래의 기술에서 사용되는 도트 패턴이 상기 홀로그램(25)에 기록되어지는 정보가 된다. 따라서 상기 홀로그램(25)이 종래의 기술에서의 상기 확산판(19)의 기능을 수행하게 된다.FIG. 3 schematically shows an apparatus for recording the hologram used in FIG. 2. Light irradiated from the light source 35 toward the object 33 is scattered from the object to generate the object light 31, and the object light 31 is incident toward the hologram master 29. The reference light 27 is incident on the hologram master as a reference light so that the information about the object 33 is recorded in the hologram master 29 due to the interference between the object light 31 and the reference light 27. The information recorded on the hologram master 29 and generated is the hologram 25 used in the light guide plate of the present invention. In the present invention, the dot pattern used in the conventional art becomes the information recorded in the hologram 25. Thus, the hologram 25 performs the function of the diffusion plate 19 in the prior art.

상기한 설명에서 많은 사항이 구체적으로 기재되어 있으나, 그들은 발명의 범위를 한정하는 것이라기보다, 바람직한 실시예의 예시로서 해석되어야 한다.While many details are set forth in the foregoing description, they should be construed as illustrative of preferred embodiments, rather than to limit the scope of the invention.

상술한 바와 같이 본 발명의 장점은 액정 디스플레이(LCD)와 같은 평판 디스플레이에서 사용되고 있는 백라이트에서, 홀로그램을 도광판에 구비하여 확산판과 같은 부품의 축소가 가능하여 구조가 단순화되고 광효율을 증가시킬 수 있는 것이다.As described above, an advantage of the present invention is that in a backlight that is used in a flat panel display such as a liquid crystal display (LCD), a hologram is provided on a light guide plate to reduce a component such as a diffusion plate, thereby simplifying a structure and increasing light efficiency. will be.

Claims (6)

도광판;Light guide plate; 상기 도광판의 측면에 구비된 제 1 광원; 및A first light source provided on a side of the light guide plate; And 상기 도광판의 바닥의 전면에 구비되고 상기 제 1 광원으로부터 입사하는 광을 참조광으로 하여 광을 30도 이상의 출사각도로 방출시는 제 2 광원;을 포함하는 것을 특징으로 하는 평면표시소자용 백라이트.And a second light source provided on the front surface of the bottom of the light guide plate and emitting light at an exit angle of 30 degrees or more using light incident from the first light source as a reference light. 제 1 항에 있어서,The method of claim 1, 상기 제 2 광원은 홀로그램인 것을 특징으로 하는 평면표시소자용 백라이트.And said second light source is a hologram. 삭제delete 제 1 항 또는 제 2 항에 있어서,The method according to claim 1 or 2, 상기 제 2 광원의 바닥에 반사판이 더 구비되는 것을 특징으로 하는 평면표시소자용 백라이트.The backlight for the flat panel display device, characterized in that the reflector is further provided on the bottom of the second light source. 제 1 항에 있어서,The method of claim 1, 상기 도광판의 앞면에서 방출된 광을 집광하는 프리즘판이 더 구비되는 것을 특징으로 하는 평면표시소자용 백라이트.And a prism plate for collecting light emitted from the front surface of the light guide plate. 제 5 항에 있어서,The method of claim 5, 상기 프리즘판의 앞면에 보호판이 더 구비되는 것을 특징으로 하는 평면표시소자용 백라이트.A backlight for a flat panel display device, characterized in that the protective plate is further provided on the front surface of the prism plate.
KR10-2001-0023226A 2001-04-28 2001-04-28 Backlight for flat display device KR100400004B1 (en)

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JPH04303822A (en) * 1991-04-01 1992-10-27 Yazaki Corp Backlight for transmission type display element
JPH10232315A (en) * 1997-02-20 1998-09-02 Dainippon Printing Co Ltd Holographic optical member
JPH11125817A (en) * 1997-10-23 1999-05-11 Nec Corp Back light for transmission type display device, and liquid crystal display device
JP2000162995A (en) * 1998-11-26 2000-06-16 Dainippon Printing Co Ltd Hologram display device with illumination
KR20010008540A (en) * 1999-07-02 2001-02-05 양근창 Plane light source unit and method for manufacturing hologram layers used for the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04303822A (en) * 1991-04-01 1992-10-27 Yazaki Corp Backlight for transmission type display element
JPH10232315A (en) * 1997-02-20 1998-09-02 Dainippon Printing Co Ltd Holographic optical member
JPH11125817A (en) * 1997-10-23 1999-05-11 Nec Corp Back light for transmission type display device, and liquid crystal display device
JP2000162995A (en) * 1998-11-26 2000-06-16 Dainippon Printing Co Ltd Hologram display device with illumination
KR20010008540A (en) * 1999-07-02 2001-02-05 양근창 Plane light source unit and method for manufacturing hologram layers used for the same

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