KR20000013515A - Phosphor liquid crystal display - Google Patents

Phosphor liquid crystal display Download PDF

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Publication number
KR20000013515A
KR20000013515A KR1019980032411A KR19980032411A KR20000013515A KR 20000013515 A KR20000013515 A KR 20000013515A KR 1019980032411 A KR1019980032411 A KR 1019980032411A KR 19980032411 A KR19980032411 A KR 19980032411A KR 20000013515 A KR20000013515 A KR 20000013515A
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KR
South Korea
Prior art keywords
liquid crystal
reflector
backlight
light
crystal display
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KR1019980032411A
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Korean (ko)
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배재우
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손욱
삼성에스디아이 주식회사
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Priority to KR1019980032411A priority Critical patent/KR20000013515A/en
Publication of KR20000013515A publication Critical patent/KR20000013515A/en

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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133615Edge-illuminating devices, i.e. illuminating from the side
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/00362-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means 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
    • G02B6/0051Diffusing sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0081Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086Positioning aspects
    • G02B6/0091Positioning aspects of the light source relative to the light guide

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

Abstract

PURPOSE: A phosphor liquid crystal display is to increase the amount of incident lights and to achieve stable image and uniform brightness through the whole screen. CONSTITUTION: A phosphor liquid crystal display comprises a collimator(24), a backlight(34) and an elliptical reflector(32). In the center of the collimator(24), a parabolic reflector(26) containing a reflector(28) is formed. A plurality of backlights(34) which radiate the lights to the reflector(28) are installed in the upper portion of the collimator(24). The elliptical reflector(32) is installed around the backlights(34) and reflects the lights illuminated from the backlights(34). Thereby, the stable image is achieved and the weight and size of liquid crystal display are adjusted according to the size of parabolic reflector without causing color diffusion or stain, as the lights illuminated from the backlights is horizontally incident toward a liquid crystal cell shutter without interference.

Description

형광 액정표시장치Fluorescent Liquid Crystal Display

본 발명은 형광 액정표시장치(Phosphor Liquid Crystal Display)에 관한 것으로서, 특히 백라이트(back light)에서 액정셀로 조사되는 빛이 콜리메이터(collimator)에서 반사되어 평행하게 입사되도록 함으로써 입사 광량을 증대시킨 형광 액정표시장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent liquid crystal display (Phosphor Liquid Crystal Display), and in particular, a fluorescent liquid crystal in which the amount of incident light is increased by allowing the light irradiated to the liquid crystal cell in the back light to be reflected in a collimator and incident in parallel. It relates to a display device.

형광 액정표시소자는 도 4에 도시한 바와 같이 백라이트(2)에서 조사되는 빛이 콜리메이터(4)에서 반사되어 액정셀 셔터(6)를 통과하게 되고, 상기 액정셀 셔터(6)는 액정의 배향성을 이용하여 백라이트(2)의 빛을 통과시키거나 통과되지 않게 스위칭하여 주는 작용을 함으로써, 상기 백라이트(2)의 빛이 정해진 표시 형태를 이루게 되며, 이렇게 액정셀 셔터(6)를 통과한 백라이트(2)의 빛은 형광막(8)의 형광체를 여기시킴에 따라 원하는 화상을 구현하는 구성으로 되어 있다.In the fluorescent liquid crystal display device, as shown in FIG. 4, light irradiated from the backlight 2 is reflected by the collimator 4 to pass through the liquid crystal cell shutter 6, and the liquid crystal cell shutter 6 has a liquid crystal orientation. By switching the light of the backlight 2 to pass through or not to pass through, the light of the backlight 2 forms a predetermined display form, and thus the backlight passing through the liquid crystal cell shutter 6 The light of 2) is configured to excite the phosphor of the fluorescent film 8 to realize a desired image.

상기 콜리메이터(4)의 내측면에는 반사경이 배치되고, 이 반사경의 내측 요부에는 백라이트(2)가 배치되어 빛을 발하며, 이 빛은 반사경에서 반사되어 액정셀 셔터(6)를 통해 평행하게 조사되도록 설계되어지나, 백라이트(2)에서 방사되는 빛의 일부가 콜리메이터(4)의 반사경에 반사되지 않고 액정셀 셔터(6)에 비스듬하게 직접 입사됨으로 액정셀의 화소에 색퍼짐 혹은 타색 침범으로 인한 얼룩이 발생된다.A reflector is disposed on the inner surface of the collimator 4, and a backlight 2 is disposed on the inner recess of the reflector to emit light, and the light is reflected by the reflector to be irradiated in parallel through the liquid crystal cell shutter 6. Although a part of the light emitted from the backlight 2 is not reflected by the reflector of the collimator 4 and is directly obliquely incident on the liquid crystal cell shutter 6, the color of the pixel of the liquid crystal cell is uneven due to color spreading or other color invasion. Is generated.

또, 백라이트에서 조사되는 빛과 백라이트의 배면, 즉 반사경의 내측 첨부로 방사되어 반사되어지는 빛이 상호 간섭됨으로써 밝기차가 생겨 액정셀을 통과한 빛이 형광막에 조사될 때 안정된 화상을 얻을 수 없다.In addition, when the light irradiated from the backlight and the back of the backlight, that is, the light emitted and reflected by the inner side of the reflector are mutually interfering, a difference in brightness occurs and a stable image cannot be obtained when the light passing through the liquid crystal cell is irradiated onto the fluorescent film. .

아울러, 화면 면적을 크게 할 목적으로 콜리메이터의 크기를 확대시키면 액정표시장치의 전체적인 중량과 부피가 커지는 문제점이 있게 되는 것이다.In addition, when the size of the collimator is enlarged for the purpose of increasing the screen area, there is a problem in that the overall weight and volume of the liquid crystal display are increased.

이러한 문제점들을 해소하기 위해서 입사 광량을 증대시키고 안정된 화상을 구현하며 전체 화면에서 밝기가 일정한 형광 액정표시장치를 제공하는 것이 목적이다.In order to solve these problems, an object of the present invention is to provide a fluorescent liquid crystal display device which increases the amount of incident light, realizes a stable image, and has a constant brightness in the entire screen.

이를 위하여 본 발명은 다음과 같은 구성을 제안하는 바이다.To this end, the present invention proposes the following configuration.

콜리메이터의 중심에는 반사경을 포함하는 포물경이 형성되고 반사경으로 빛을 방사하는 백라이트가 상기 콜리메이터의 상단부에 복수개 설치되며 상기 백라이트의 주위로 타원 반사경이 설치되어 백라이트에서 조사된 빛을 반사되도록 하는 구성으로 된다.A parabolic mirror including a reflector is formed at the center of the collimator, and a plurality of backlights emitting light through the reflector are installed at the upper end of the collimator, and an elliptical reflector is installed around the backlight to reflect the light emitted from the backlight. .

특히, 상기 백라이트의 높이가 상기 포물경의 첨부 높이보다 높게 설치될 수 있다.In particular, the height of the backlight may be installed higher than the attachment height of the parabolic mirror.

이에 따라, 백라이트에서 조사되는 빛이 간섭없이 액정셀 셔터를 향해 평행하게 입사되어 색퍼짐이나 얼룩이 발생하지 않음으로써 안정된 화상을 얻을 수 있으며, 포물경의 크기에 따라 액정표시장치의 중량과 크기를 조절할 수 있게 되는 것이다.Accordingly, since the light emitted from the backlight is incident in parallel toward the liquid crystal cell shutter without interference, color spreading or staining does not occur, thereby obtaining a stable image, and the weight and size of the liquid crystal display device can be adjusted according to the size of the parabolic diameter. Will be.

도 1은 본 발명에 따른 형광 액정표시장치의 구조를 개략적으로 도시한 도면.1 is a view schematically showing the structure of a fluorescent liquid crystal display device according to the present invention;

도 2는 도 1의 A를 상세히 도시하고 백라이트에서 방사된 빛의 경로를 도시한 확대도.FIG. 2 is an enlarged view detailing A of FIG. 1 and showing a path of light emitted from the backlight. FIG.

도 3은 본 발명의 다른 실시예를 도시한 도면.3 illustrates another embodiment of the present invention.

도 4는 종래의 형광 액정표시장치의 구조를 개략적으로 도시한 측면도.Figure 4 is a side view schematically showing the structure of a conventional fluorescent liquid crystal display device.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

20 : 액정셀 셔터 22 : 형광막20 liquid crystal cell shutter 22 fluorescent film

24 : 콜리메이터 26 : 포물경24: collimator 26: parabola

28 : 반사경 32 : 타원 반사경28: reflector 32: elliptical reflector

34 : 백라이트 36 : 반사광34: backlight 36: reflected light

38 : 직사광 40 : 평행광38: direct light 40: parallel light

이하 본 발명에 따른 바람직한 실시예를 첨부된 도면에 의거하여 상세히 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 형광 액정표시장치의 구조를 개략적으로 도시한 도면이고, 도 2는 도 1의 A를 상세히 도시함과 아울러 백라이트에서 방사된 빛의 경로를 도시한 확대도이다.FIG. 1 is a view schematically showing the structure of a fluorescent liquid crystal display according to the present invention, and FIG. 2 is an enlarged view showing the path of light emitted from the backlight as well as detail A of FIG. 1.

도면 부호 20인 액정셀 셔터는 통상적인 구조를 가지며 인가되는 전계에 의해 패턴화된 화소를 통해 빛이 투과되고, 이 액정셀 셔터(20)의 전면에는 투과된 빛에 의해 여기되어 발광하는 형광체가 도포된 형광막(22)이 배치된다.The liquid crystal cell shutter 20 has a conventional structure, and light is transmitted through a pixel patterned by an applied electric field, and a phosphor that is excited by the transmitted light and emits light is formed on the front surface of the liquid crystal cell shutter 20. The applied fluorescent film 22 is disposed.

상기 액정셀 셔터(20)의 하부에는 본 발명에 따른 콜리메이터(24)가 배치되는 바, 그 중심부에는 중심선(C)에 대해 대칭인 포물경(26)이 위치하고 이의 측면을 따라 일정한 곡률로 성형된 반사경(28)이 부착되어진다.The collimator 24 according to the present invention is disposed below the liquid crystal cell shutter 20, and a parabola 26 symmetrical with respect to the center line C is positioned at a central portion thereof and is formed with a constant curvature along its side. The reflector 28 is attached.

상기 포물경(26)의 양 끝에 세워진 지지대(30)의 상부에는 타원 반사경(32)이 형성되고, 이 타원 반사경(32)의 내부에 상기 형광막(22)의 형광체를 여기시킬 수 있는 자외선을 방출하는 백라이트(34)가 장착된다.An ellipsoidal reflector 32 is formed at an upper portion of the support 30 which is erected at both ends of the parabolic mirror 26, and the ultraviolet rays that can excite the phosphor of the fluorescent film 22 are formed inside the ellipsoidal reflector 32. The emitting backlight 34 is mounted.

특히, 상기 백라이트(34)의 높이는 포물경(26)의 첨부 높이보다 높게 설치되도록 함에 따라 양측의 백라이트(34)에서 방사되는 빛이 상호 간섭되는 것을 방지하여 형광막(22)으로 조사되는 빛의 전체적인 균일도를 유지함으로써 얼룩과 그림자가 없는 원하는 화상을 얻을 수 있다.In particular, the height of the backlight 34 is set to be higher than the attachment height of the parabolic mirror 26, so that the light emitted from the backlight 34 on both sides is prevented from interfering with each other. By maintaining the overall uniformity, a desired image can be obtained without spots and shadows.

이러한 구조로 이루어진 콜리메이터(24)는 도 2에 도시한 바와 같이 타원 반사경(28)이 설치됨에 따라 백라이트(34)의 광량 손실을 줄일 수 있다.The collimator 24 having such a structure can reduce the amount of light loss of the backlight 34 as the elliptical reflector 28 is installed as shown in FIG. 2.

좀 더 구체적으로, 타원 반사경(32)을 사용치 않고 직접 백라이트(34)에서 포물경을 향해 빛을 방사하게 되면 백라이트(34)의 전체 광량의 방사량은 θ/360도에 해당하는 광량만 입사하고 백라이트(34) 전체 방사량의 1-θ/360도에 해당하는 광량은 손실된다. 이를 방지할 목적으로 사용되어진 타원 반사경(32)은 백라이트(34)의 1-θ/360도 영역에 해당하는 빛을 반사광(36)이 되도록 하여 포물경(26)의 반사경(28)으로 입사시킨다.More specifically, if the light is emitted directly from the backlight 34 toward the parabolic mirror without using the ellipsoidal reflector 32, the total radiation amount of the backlight 34 is incident only to the amount of light corresponding to θ / 360 degrees. The amount of light corresponding to 1-θ / 360 degrees of the total radiation amount of the backlight 34 is lost. The elliptical reflector 32 used for the purpose of preventing this causes the light corresponding to the 1-θ / 360 degree region of the backlight 34 to be reflected light 36 and enters the reflector 28 of the parabolic mirror 26. .

이 때, 타원 반사경(32)의 개구 직경을 적절하게 유지하여 백라이트(34)에서 조사된 빛이 포물경(26)의 첨부와 하부 사이 영역으로 입사될 수 있도록 하며, 또 빛이 액정셀 셔터(20)로 직접 입사되는 것을 차단함과 동시에 θ의 크기를 최대한 크게 되도록 조절한다.At this time, the opening diameter of the ellipsoidal reflector 32 is properly maintained so that the light irradiated from the backlight 34 can be incident on the area between the attachment and the bottom of the parabolic mirror 26, and the light is emitted from the liquid crystal cell shutter ( 20) and block the incident directly, and adjust the size of θ to be as large as possible.

이에 따라, 반사광(36)과 직사광(38)은 개구 직경에 의해 손실됨없이 포물경(26)의 반사경(28)에서 반사되어 평행광(40)으로 액정셀 셔터(20)를 수직으로 통과한 후 형광막(22)의 형광체를 여기하게 되는 것이다.Accordingly, the reflected light 36 and the direct light 38 are reflected by the reflector 28 of the parabolic mirror 26 without being lost by the aperture diameter, and pass through the liquid crystal cell shutter 20 vertically with the parallel light 40. After that, the phosphor of the fluorescent film 22 is excited.

도 3에서는 본 발명에 따른 다른 실시예를 보이고 있다.3 shows another embodiment according to the present invention.

이는 타원 반사경(42)의 형성 위치를 지지대(30)의 하부로 하여 그 내부로 백라이트(34)를 설치함으로써 전술한 실시예와 동일한 결과를 얻을 수 있음을 나타낸다.This indicates that the same result as in the above-described embodiment can be obtained by installing the backlight 34 therein with the position where the elliptical reflector 42 is formed under the support 30.

즉, 포물경(26)의 반사경(28) 곡률과 타원 반사경(42)의 개구 직경을 적절하게 조절하여 중심선(C)에 대칭인 포물경(26)의 첨부와 하부로 백라이트(34)의 빛이 조사되도록 하여 백라이트(34)의 전체 광량에 대한 손실없이 직사광과 반사광이 액정셀 셔터(20)에 대해 수직하는 평행광(40)을 형성토록 하여 액정셀 셔터(20)를 투과한 평행광(40)이 형광막(22)의 형광체를 여기하여 발광 휘도와 안정된 화상을 얻을 수 있도록 한다.That is, the curvature of the reflector 28 of the parabolic mirror 26 and the opening diameter of the elliptical reflector 42 are appropriately adjusted so that the light of the backlight 34 is attached to and attached to the parabolic mirror 26 which is symmetric to the center line C. Parallel light transmitted through the liquid crystal cell shutter 20 by allowing the direct light and the reflected light to form a parallel light 40 perpendicular to the liquid crystal cell shutter 20 without losing the total amount of light of the backlight 34. 40) excites the phosphor of the fluorescent film 22 so that the luminescence brightness and a stable image can be obtained.

이상에서 살펴본 바와 같이 본 발명에 의한 실시예는 종래의 문제점을 실질적으로 해소하고 있다.As described above, the embodiment of the present invention substantially solves the conventional problems.

즉, 콜리메이터의 중심부에 형성되는 포물경이 중심선에 대해 대칭으로 되어 지지대에 장착되는 백라이트에서 방사되는 빛이 간섭없이 평행광 상태로 균일하게 액정셀로 입사됨으로써 얼룩이나 색퍼짐이 나타나지 않게 된다.That is, the parabolic diameter formed at the center of the collimator is symmetrical with respect to the center line, so that the light emitted from the backlight mounted on the support is uniformly incident on the liquid crystal cell in parallel light state without interference, so that spots and color spreads do not appear.

또한, 백라이트가 타원 반사경에 내장되어 빛을 방사함으로써 1-θ/360도에 해당하는 반사광까지도 모두 포물경을 거쳐 액정셀 셔터로 입사되어 형광막의 형광체를 여기시키는 전체 광량이 증대됨에 따라 발광 휘도를 향상시킨다.In addition, since the backlight is embedded in the ellipsoidal reflector and emits light, even the reflected light corresponding to 1-θ / 360 degrees is incident on the liquid crystal cell shutter through the parabolic mirror to increase the total amount of light that excites the phosphor of the fluorescent film. Improve.

아울러, 타원 반사경의 개구 직경을 적절히 조절할 수 있기 때문에 포물경의 높이도 조절 가능하게 되어 형광 액정표시장치의 전체적인 중량과 부피를 줄일 수 있는 박막화가 실현되고 나아가 화면의 대형화에도 기여하게 되는 것이다.In addition, since the opening diameter of the ellipsoidal reflector can be adjusted appropriately, the height of the parabolic diameter can be adjusted, thereby realizing a thin film that can reduce the overall weight and volume of the fluorescent liquid crystal display device and contribute to the enlargement of the screen.

더욱이, 타원 반사경에 의해 백라이트에서 방사되는 빛을 손실없이 액정셀 셔터로 입사되도록 함으로써 안정된 화상을 얻을 수 있다.Furthermore, a stable image can be obtained by allowing the light emitted from the backlight by the ellipsoidal reflector to enter the liquid crystal cell shutter without loss.

Claims (2)

백라이트에서 조사된 빛이 콜리메이터에 의해 반사되어 전계 인가에 따라 동작하는 액정셀 셔터를 통과한 후 형광막의 형광체를 여기함으로써 원하는 화상을 구현하는 구성으로 이루어진 형광 액정표시장치에 있어서,In the fluorescent liquid crystal display device composed of a configuration that implements a desired image by exciting the phosphor of the fluorescent film after the light irradiated from the backlight is reflected by the collimator and passed through the liquid crystal cell shutter operating in accordance with the application of the electric field, 상기 콜리메이터(24)의 중심에는 반사경(28)을 포함하는 포물경(26)이 형성되고 반사경(28)으로 빛을 방사하는 백라이트(34)가 상기 콜리메이터(24)의 상단부에 복수개 설치되며 상기 백라이트(34)의 주위로 타원 반사경(32)이 설치됨을 특징으로 하는 형광 액정표시장치.A parabolic mirror 26 including a reflector 28 is formed at the center of the collimator 24, and a plurality of backlights 34, which emit light to the reflector 28, are provided at the upper end of the collimator 24, and the backlight is provided. And an ellipsoidal reflecting mirror 32 is provided around 34. 제 1 항에 있어서, 상기 백라이트의 높이가 상기 포물경의 첨부 높이보다 높게 설치됨을 특징으로 하는 형광 액정표시장치.2. The fluorescent liquid crystal display device according to claim 1, wherein a height of the backlight is higher than an attached height of the parabolic mirror.
KR1019980032411A 1998-08-10 1998-08-10 Phosphor liquid crystal display KR20000013515A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100665005B1 (en) * 2004-12-30 2007-01-09 삼성전기주식회사 Backlight system having leds

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100665005B1 (en) * 2004-12-30 2007-01-09 삼성전기주식회사 Backlight system having leds

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