KR100318828B1 - Back light for liquid crystal display - Google Patents
Back light for liquid crystal display Download PDFInfo
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- KR100318828B1 KR100318828B1 KR1019990061571A KR19990061571A KR100318828B1 KR 100318828 B1 KR100318828 B1 KR 100318828B1 KR 1019990061571 A KR1019990061571 A KR 1019990061571A KR 19990061571 A KR19990061571 A KR 19990061571A KR 100318828 B1 KR100318828 B1 KR 100318828B1
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- light
- prism
- guide plate
- light guide
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 21
- 238000009792 diffusion process Methods 0.000 claims abstract description 9
- 230000001681 protective effect Effects 0.000 claims abstract description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
Classifications
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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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
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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
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
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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
- G02B6/0055—Reflecting element, sheet or layer
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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)
- Planar Illumination Modules (AREA)
Abstract
본 발명은 액정표시장치의 백 라이트를 개시한다.The present invention discloses a backlight of a liquid crystal display device.
본 발명은, 양측면에 램프가 내장되며, 상면으로부터 반사판과 도광판이 순차적으로 설치된 프레임과; 프레임의 상부에 위치되며, 반사판으로부터 반사되고 도광판에 의해 안내된 빛을 액정표시소자를 향해 집광하여 주사시키는 프리즘과; 프리즘을 외부 충격으로부터 보호하도록 프리즘의 상면에 설치되는 보호판과; 프리즘과 도광판 사이에 위치되며, 도광판으로부터 안내되며, 소정각도로 주사되는 빛을 직진 성향으로 변환시켜 프리즘으로 안내하는 빔 변환수단;을 포함하여 된 것으로서, 종래 램프로부터 주사되고 도광판에 의해 안내된 빛의 확산을 위하여 하나의 홀로그래픽 확산판을 사용함으로써, 소정각도로 주사되는 빛을 LCD를 향해 즉, 수직으로 변환하여 주사시킬 수 있게된다.The present invention includes a frame in which lamps are built in both sides, and a reflection plate and a light guide plate are sequentially installed from an upper surface thereof; A prism positioned on an upper portion of the frame, for collecting and scanning light reflected from the reflecting plate and guided by the light guide plate toward the liquid crystal display device; A protective plate installed on an upper surface of the prism to protect the prism from external impacts; A beam converting means positioned between the prism and the light guide plate and guided by the light guide plate to convert the light scanned at a predetermined angle into a straight propagation direction to the prism. The light is scanned from a conventional lamp and guided by the light guide plate. By using one holographic diffuser for diffusion of light, the light scanned at a predetermined angle can be converted and scanned toward the LCD, that is, vertically.
따라서 광량의 증가에 의한 휘도 향상을 꾀할 수 있을 뿐만 아니라, 하나의 홀로그래픽 확산판을 사용함으로써 이를 통한 휘도 향상과 특히 제품의 슬림화를 도모할 수 있는 이점이 있다.Therefore, it is possible not only to improve the luminance by increasing the amount of light, but also to improve the luminance and slim the product by using one holographic diffuser.
Description
본 발명은 백 라이트(back lit)에 관한 것으로서, 보다 상세하게는 액정표시장치(LCD)의 배면광으로 사용되는 액정표시장치의 백 라이트에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight, and more particularly, to a backlight of a liquid crystal display device used as a backlight of a liquid crystal display (LCD).
근래에 들어와서 정버기기(예컨대 컴퓨터등)의 사용빈도와 이용자가 증가함에 따라 이들 정보기기를 위한 영상표시수단이 급격히 발전되고 있다.In recent years, as the frequency of use and the users of the stationary device (such as a computer) increases, the image display means for these information devices is rapidly developed.
이러한 영상표시수단으로는 모니터(monitor)와 같은 영상장치가 제안되어 있는 바, 특히 액정표시장치(Liquid crystal display;이하 LCD라 약칭함)는 기존의 음극선관(Cathod ray tube;CRT)과는 달리 전력소머가 매우 적고, 전자총을 사용하지 않고 얇고 가벼운 특징을 갖고 있어 근래에 가장 급속하게 개발 및 보급되고 있다.As an image display means, an image device such as a monitor has been proposed. In particular, a liquid crystal display (hereinafter, referred to as an LCD) is different from a conventional cathode ray tube (CRT). It has very few power sources, has a thin and light feature without using an electron gun, and is being developed and distributed most rapidly in recent years.
한편, 이러한 LCD는 자체적으로 발광(發光)하는 성능을 갖지 못하는 것이기 때문에 일반적으로 사용되고 있는 투과형 LCD에서는 광원(光源)으로서 백 라이트(back lit)를 사용하게 되는 바, LCD의 성능은 백라이트의 성능에 의해 크게 영향을 받게된다.On the other hand, since such LCDs do not have the ability to emit light on their own, in a transmissive LCD which is generally used, a backlight is used as a light source. Are greatly affected by this.
도 1에는 일반적인 LCD에 채용되고 있는 백 라이트를 나타내 보였다.1 shows a backlight used in a general LCD.
이는, 양측면에 램프(lamp;11,12)가 설치되는 프레임(frame;10)을 구비한다.It has a frame 10 on which lamps 11 and 12 are mounted on both sides.
프레임(10)의 바닥면에는 접착제(도시되지 않음)를 통해 반사판(30)이 접착 고정되는 바, 이 반사판(30)은 램프(11,12)로부터 주사된 빛을 소정각도로 반사시키는 기능을 수행한다.The reflecting plate 30 is adhesively fixed to the bottom surface of the frame 10 through an adhesive (not shown). The reflecting plate 30 has a function of reflecting the light scanned from the lamps 11 and 12 at a predetermined angle. Perform.
한편, 이 반사판(30)의 상측에는 프레임(10)에 지지되며, 반사판(30)에 의해 반사된 빛이 안내되는 도광판(Light guide panel;LGP)(40)이 위치된다.On the other hand, a light guide panel (LGP) 40, which is supported by the frame 10 and guides the light reflected by the reflector 30, is positioned above the reflector 30.
도광판(40)의 상측에는 휘도(輝度)를 향상시키기 위하여 적어도 2매의 확산판(diffuser;50,60)이 설치되며, 확산판(50,60)의 상측에는 빛을 집광하여 도시되지 않은 LCD를 향해 주사하기 위한 프리즘(prism;70)이 위치된다.At least two diffusers 50 and 60 are provided on the upper side of the light guide plate 40 to improve luminance, and an LCD (not shown) condenses light on the upper sides of the diffuser plates 50 and 60. A prism 70 for scanning toward is located.
그리고 프리즘(70)과 확산판(50,60)을 외부 충격으로부터 보호하기 위한 것으로서, 보호판(protector;80)가 프리즘(70) 상부에 위치된다.In order to protect the prism 70 and the diffusion plates 50 and 60 from external impact, a protector 80 is positioned above the prism 70.
이러한 구성을 갖는 액정표시장치의 백 라이트는, 램프(11,12)에 전원이 인가되어 빛을 발하게 되면, 프레임(10)에 마련된 반사판(30)과 도광판(40)을 통해 확산판(50,60)으로 안내되어 확산되고, 프리즘(70)을 통해 집광된채 LCD로 주사되게 되는 것이다.When the backlight of the liquid crystal display device having such a configuration emits light when power is applied to the lamps 11 and 12, the diffuser plate 50 may be formed through the reflector plate 30 and the light guide plate 40 provided in the frame 10. 60 is guided to and diffused, and is focused on the prism 70 and scanned by the LCD.
그러나 이와같은 종래 액정표시장치의 백 라이트에 있어서는, 확산판(50,60)을 통과하는 빛의 량이 적어 조명효율의 저하를 초래하는 문제점이 내재되어 있다.However, in the backlight of the conventional liquid crystal display device, there is a problem in that the amount of light passing through the diffusion plates 50 and 60 is small, resulting in a decrease in the lighting efficiency.
이와같은 문제점은, 일반적으로 도광판(40)을 거쳐 확산판(50,60)으로 입사되는 광이 수직할 경우에는 광량손실이 적은 것이지만, 입사각도가 수직과 차이가 있을 경우에는 도 2에 나타내 보인 바와 같이 LCD면으로의 진행 방향과 매우 상이하게 진행하기 때문에 발생된다.Such a problem is generally low in the amount of light loss when the light incident through the light guide plate 40 into the diffuser plates 50 and 60 is vertical, but is shown in FIG. 2 when the incident angle is different from the vertical angle. As it is, it is generated because it proceeds very differently from the direction of travel to the LCD surface.
또한 복수의 확산판(50,60)을 사용하는 것이, 입사되는 광을 적당한 양으로 퍼지게 하여 LCD상에서의 광량을 균일하게 확보하는 것이 목적이지만, 보통 하나의 확산판(50,60)을 통과하는 광량의 투과율이 약 68% 정도이기 때문에 실질적으로 복수의 확산판(50,60)을 통과하는 빛의 투과율을 그 만큼 떨어지게 된다.In addition, the use of the plurality of diffusion plates 50 and 60 is intended to spread the incident light in an appropriate amount so as to uniformly secure the amount of light on the LCD. Since the transmittance of the light amount is about 68%, the transmittance of light passing through the plurality of diffusion plates 50 and 60 is substantially reduced by that much.
결과적으로 상술한 이유에 의해 실질적으로 LCD를 향해 주사되는 빛의 량은 대략 30%미만의 아주 적은 량이 된다.As a result, for the reasons described above, the amount of light that is substantially scanned toward the LCD is very small, less than about 30%.
따라서 백 라이트의 성능열화 즉, 조명광량의 효율이 저하되게 되는 것이다.Therefore, performance degradation of the backlight, that is, efficiency of the amount of illumination light is reduced.
본 발명은 이와같은 종래의 문제점을 감안하여 창출된 것으로서, 조명광량의 효율을 향상시킬 수 있으며, 특히 복수의 확산판을 사용하지 않음으로써 전체 제품의 슬림화를 도모할 수 있는 액정표시장치의 백 라이트를 제공함에 그 목적이 있다.The present invention has been made in view of such a conventional problem, and can improve the efficiency of the amount of illumination light, and in particular, the backlight of the liquid crystal display device, which can reduce the overall product size by not using a plurality of diffuser plates. The purpose is to provide.
도 1은 일반적인 액정표시장치의 백 라이트를 나타낸 단면도,1 is a cross-sectional view showing a backlight of a general liquid crystal display device;
도 2는 종래 확산판으로 빛이 통과하는 상태를 나타낸 구성도,2 is a configuration diagram showing a state in which light passes through the conventional diffusion plate,
도 3은 본 발명에 따른 액정표시장치의 백 라이트를 나타낸 단면도,3 is a cross-sectional view showing a backlight of a liquid crystal display according to the present invention;
도 4는 본 발명에 따른 액정표시장치의 백 라이트에 있어서, 홀로그래픽 확산판을 통과하는 빛의 상태를 개념적으로 나타낸 구성도.4 is a block diagram conceptually illustrating a state of light passing through a holographic diffuser in a backlight of a liquid crystal display according to the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
100 : 프레임 110,120 : 램프100: frame 110,120: lamp
300 : 반사판 400 : 도광판300: reflector 400: light guide plate
500 : 홀로그래픽 확산판500: holographic diffuser
600 : 프리즘 700 : 보호판600: Prism 700: Shield
이와같은 목적을 달성하기 위하여 본 발명에 따른 액정표시장치의 백 라이트는, 양측면에 램프가 내장되며, 상면으로부터 반사판과 도광판이 순차적으로 설치된 프레임과; 상기 프레임의 상부에 위치되며, 반사판으로부터 반사되고 도광판에 의해 안내된 빛을 액정표시소자를 향해 집광하여 주사시키는 프리즘과; 상기 프리즘을 외부 충격으로부터 보호하도록 프리즘의 상면에 설치되는 보호판과; 상기 프리즘과 상기 도광판 사이에 위치되며, 상기 도광판으로부터 안내되며, 소정각도로 주사되는 빛을 직진 성향으로 변환시켜 프리즘으로 안내하는 빔 변환수단;을 포함하여 된 것을 그 특징으로 한다.In order to achieve the above object, a backlight of a liquid crystal display according to the present invention includes a frame in which lamps are built in both sides, and a reflection plate and a light guide plate are sequentially installed from an upper surface thereof; A prism positioned on the frame and condensing and reflecting the light reflected from the reflecting plate and guided by the light guide plate toward the liquid crystal display device; A protective plate installed on an upper surface of the prism to protect the prism from external impacts; And a beam converting means positioned between the prism and the light guide plate to guide the light guided from the light guide plate to the prism by converting the light scanned at a predetermined angle into a straight propensity.
본 발명의 바람직한 한 특징은, 상기 빔 변환수단은, 상기 도광판과 프리즘 사이에 위치되며, 표면에 홀로그램 패턴이 형성된 홀로그래픽 확산판인 것에 있다.A preferred feature of the present invention is that the beam converting means is a holographic diffuser plate which is positioned between the light guide plate and the prism and has a hologram pattern formed on the surface thereof.
이하 본 발명에 따른 액정표시장치의 백 라이트의 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, a preferred embodiment of a backlight of a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.
도 3은 본 발명에 따른 액정표시장치의 백 라이트를 나타낸 단면도이고, 도 4는 본 발명에 따른 액정표시장치의 백 라이트에 있어서, 홀로그래픽 확산판을 통과하는 빛의 상태를 개념적으로 나타낸 구성도이다.3 is a cross-sectional view illustrating a backlight of the liquid crystal display according to the present invention, and FIG. 4 is a schematic view showing the state of light passing through the holographic diffuser in the backlight of the liquid crystal display according to the present invention. to be.
이에 나타내 보인 바와 같이 본 발명에 따른 액정표시장치의 백 라이트는, 양측면에 램프(lamp;110,120)가 설치되는 프레임(frame;100)을 구비한다.As shown therein, the backlight of the liquid crystal display according to the present invention includes a frame 100 in which lamps 110 and 120 are installed at both sides.
프레임(100)의 바닥면에는 접착제를 통해 반사판(300)이 접착 고정되는 바, 이 반사판(300)은 램프(110,120)로부터 주사된 빛을 소정각도로 반사시키는 기능을 수행한다.The reflecting plate 300 is fixed to the bottom surface of the frame 100 through an adhesive, and the reflecting plate 300 reflects the light scanned from the lamps 110 and 120 at a predetermined angle.
한편, 이 반사판(300)의 상측에는 프레임(100)에 지지되며, 반사판(300)에 의해 반사된 빛이 안내되는 도광판(Light guide panel;LGP)(400)이 위치된다.On the other hand, the light guide plate (LGP) 400, which is supported by the frame 100 and guides the light reflected by the reflector 300, is positioned above the reflective plate 300.
도광판(400)의 상측에는 실질적으로 본 발명의 특징적인 요소를 갖고 있는 것으로서, 도광판(400)을 통과한채 소정각도로 주사되는 빛을 수직으로 즉, LCD를 향하도록 그 주사방향을 가변시키는 빔 변환수단이 마련된다.The light conversion plate 400 has substantially the characteristic elements of the present invention, and converts the scanning direction of the light scanned at a predetermined angle while passing through the light guide plate 400 vertically, that is, toward the LCD. Means are provided.
이러한 빔 변환수단으로는, 도 4에 나타내 보인 바와 같이 소정각도로 입사되는 빔을 대략 수직방향으로 ±1차, 0차의 빔으로 회절시키면서 통과시키도록 홀로그램 패턴이 형성된 홀로그래픽 확산판(500)이 사용된다.As the beam converting means, as illustrated in FIG. 4, a holographic diffuser plate 500 in which a hologram pattern is formed so as to pass a beam incident at a predetermined angle in a substantially vertical direction while diffracted into a beam of ± 1st order and 0th order This is used.
그리고 이 홀로그래픽 확산판(500)의 상측에는 빛을 집광하여 도시되지 않은 LCD를 향해 주사하기 위한 프리즘(prism;600)이 위치된다.A prism 600 is positioned above the holographic diffuser 500 to scan light toward the LCD, which is not shown.
그리고 프리즘(600)과 홀로그래픽 확산판(500)을 외부 충격으로부터 보호하기 위한 것으로서, 보호판(protector;700)가 프리즘(600) 상부에 위치된다.In addition, to protect the prism 600 and the holographic diffuser plate 500 from external impacts, a protector 700 is positioned above the prism 600.
이와같이 구성된 본 발명에 따른 액정표시장치의 백 라이트는, 램프(110,120)에 전원이 인가되어 빛을 발하게 되면, 프레임(100)에 마련된 반사판(300)과 도광판(400)을 통해 소정각도로 홀로그래픽 확산판(500)으로 안내되어 확산되고, 프리즘(600)을 통해 집광된채 LCD로 주사되게 되는 것이다.The backlight of the liquid crystal display according to the present invention configured as described above, when power is applied to the lamps 110 and 120 to emit light, is holographic at a predetermined angle through the reflective plate 300 and the light guide plate 400 provided in the frame 100. It is guided to the diffusion plate 500 to be diffused, and is scanned by the LCD while being focused through the prism 600.
이때 도광판(400)에 의해 안내된 빛이 홀로그래픽 확산판(500)을 통과할 때 도 4에 나타내 보인 바와 같이 대략 수직방향으로 변환되어 주사되게 된다.At this time, when the light guided by the light guide plate 400 passes through the holographic diffuser plate 500, it is converted into a substantially vertical direction and scanned as shown in FIG. 4.
즉, LCD를 향해 수직방향으로 주사되게 된다.That is, it is scanned vertically toward the LCD.
이에의해서는 경사각으로 주사되는 빛에 비해 프리즘(600)을 통해 집광되는 빛의 량이 증가됨으로써 휘도(輝度) 향상을 도모할 수 있게되며, 특히 복수의 확산판을 사용하지 않고 하나의 홀로그래픽 확산판(500)만을 사용함으로써 이를 통한 휘도 향상과 제품의 슬림화를 도모할 수 있게된다.As a result, the amount of light collected through the prism 600 is increased compared to the light scanned at the inclination angle, thereby improving luminance, and in particular, one holographic diffuser without using a plurality of diffuser plates. By using only 500, the brightness can be improved and the product can be made slimmer.
상술한 바와 같이 본 발명에 따른 액정표시장치의 백 라이트에 의하면, 종래 램프로부터 주사되고 도광판에 의해 안내된 빛의 확산을 위하여 하나의 홀로그래픽 확산판을 사용함으로써, 소정각도로 주사되는 빛을 LCD를 향해 즉, 수직으로 변환하여 주사시킬 수 있게된다.According to the backlight of the liquid crystal display according to the present invention as described above, by using a single holographic diffuser plate for the diffusion of the light scanned from the conventional lamp and guided by the light guide plate, the light is scanned at a predetermined angle LCD That is to say that it can be converted vertically and scanned.
따라서 광량의 증가에 의한 휘도 향상을 꾀할 수 있을 뿐만 아니라, 하나의 홀로그래픽 확산판을 사용함으로써 이를 통한 휘도 향상과 특히 제품의 슬림화를 도모할 수 있는 이점이 있다.Therefore, it is possible not only to improve the luminance by increasing the amount of light, but also to improve the luminance and slim the product by using one holographic diffuser.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990061571A KR100318828B1 (en) | 1999-12-24 | 1999-12-24 | Back light for liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990061571A KR100318828B1 (en) | 1999-12-24 | 1999-12-24 | Back light for liquid crystal display |
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| Publication Number | Publication Date |
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| KR20010058091A KR20010058091A (en) | 2001-07-05 |
| KR100318828B1 true KR100318828B1 (en) | 2002-01-04 |
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| KR1019990061571A KR100318828B1 (en) | 1999-12-24 | 1999-12-24 | Back light for liquid crystal display |
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| KR20030020538A (en) * | 2001-09-01 | 2003-03-10 | 주식회사 현대 디스플레이 테크놀로지 | Back light unit for liquid crystal display device |
| KR100962496B1 (en) * | 2003-01-24 | 2010-06-15 | 엘지디스플레이 주식회사 | Display apparatus with backlight unit |
| CN100389348C (en) * | 2005-06-01 | 2008-05-21 | 友达光电股份有限公司 | Backlight module with holographic diffusion plate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06148433A (en) * | 1992-11-04 | 1994-05-27 | Matsushita Electric Ind Co Ltd | Back light device |
| JPH06250182A (en) * | 1993-03-01 | 1994-09-09 | Enplas Corp | Prism sheet for surface light source device |
| JPH1039115A (en) * | 1996-07-23 | 1998-02-13 | Dainippon Printing Co Ltd | Prism lens sheet, back light system, and liquid crystal display device |
| KR19990019701A (en) * | 1997-08-29 | 1999-03-15 | 구자홍 | LCD Display |
-
1999
- 1999-12-24 KR KR1019990061571A patent/KR100318828B1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06148433A (en) * | 1992-11-04 | 1994-05-27 | Matsushita Electric Ind Co Ltd | Back light device |
| JPH06250182A (en) * | 1993-03-01 | 1994-09-09 | Enplas Corp | Prism sheet for surface light source device |
| JPH1039115A (en) * | 1996-07-23 | 1998-02-13 | Dainippon Printing Co Ltd | Prism lens sheet, back light system, and liquid crystal display device |
| KR19990019701A (en) * | 1997-08-29 | 1999-03-15 | 구자홍 | LCD Display |
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