KR100291242B1 - Back light unit of light plate for liquid crystal display - Google Patents

Back light unit of light plate for liquid crystal display Download PDF

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Publication number
KR100291242B1
KR100291242B1 KR1019970070839A KR19970070839A KR100291242B1 KR 100291242 B1 KR100291242 B1 KR 100291242B1 KR 1019970070839 A KR1019970070839 A KR 1019970070839A KR 19970070839 A KR19970070839 A KR 19970070839A KR 100291242 B1 KR100291242 B1 KR 100291242B1
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South Korea
Prior art keywords
light
guide plate
light guide
liquid crystal
crystal display
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KR1019970070839A
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Korean (ko)
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KR19990051494A (en
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김명
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김명
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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
    • G02B6/0035—Means 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
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • 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
    • G02B6/0035—Means 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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • 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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • 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
    • G02B6/0081—Mechanical 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
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • 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

Abstract

PURPOSE: A back light unit of a light plate for a liquid crystal display is provided to improve reflection efficiency by slantingly having a reflecting unit on a side portion and to simplify structure. CONSTITUTION: A back light unit of light plate in a liquid crystal display comprises a lamp(202) mounted on a side portion of a light plate(201) through a lamp cover(203); an entering passage(l1) inducing light output from the lamp; a reflecting line(206) mounted out of a lower portion of the light plate; horizontal and vertical portions(204,205) slantingly installed on the light plate; and a filter line(207) diffusing the light outputted from the light plate. The filter line disperses the light generated from the light plate by being formed on a front face of the light plate. Thereby, the back light unit of the light plate in the liquid crystal display improves reflection efficiency by slantingly mounting the reflecting unit on the side portion of the light plate. Moreover, the back light unit of the light plate in the liquid crystal display simplifies structure by integrally forming a filter unit on the light plate.

Description

액정표시기의 백라이트유닛 도광판Backlight unit light guide plate of liquid crystal display

본 발명은 액정표시기(LCD)의 백라이트유닛(Back Light Unit)에 관한 것으로서 특히 도광판에 관한 것이다.The present invention relates to a backlight unit of a liquid crystal display (LCD), and more particularly to a light guide plate.

종래의 일체형 도광판의 한가지 예의 구조를 도1에 나타내었다.The structure of one example of a conventional integrated light guide plate is shown in FIG.

종래의 도1과 같은 일체형 도광판의 주요 구성요소로는 종단으로 갈수록 점차 굵기가 가늘어지는 테이프 단면형의 도광판(101), 이 도광판(101)의 일측방향에 설치되는 램프(102), 램프를 도광판에 밀착고정시키기 위한 램프커버(103), 도광판(101)의 전면에서 고른 밀도로 빛의 반사가 이루어질 수 있도록 하기 위하여 도광판 아랫면에 실크인쇄나 필름코팅 등의 방법으로 밀도 또는 크기를 달리하여 형성된 다수의 도트(104), 도광판(101)의 상부로 출력되는 빛의 고른 확산을 위한 제 1 필터(105) 및 제 2 필터(106), 그리고 눈부심을 방지하기 위한 제 3 필터(107) 등으로 이루어진다.As a main component of the conventional integrated light guide plate as shown in Figure 1, the tape-shaped light guide plate 101 of which taper becomes thinner gradually toward the end, a lamp 102 installed in one direction of the light guide plate 101, and a light guide plate In order to allow light to be reflected at an even density from the front of the lamp cover 103 and the light guide plate 101 to be fixed to the light guide plate, the lower surface of the light guide plate is formed by varying the density or size by a method such as silk printing or film coating. Dot 104, a first filter 105 and a second filter 106 for even diffusion of light output to the upper portion of the light guide plate 101, and a third filter 107 to prevent glare. .

이와같이 구성되는 종래의 도광판 유닛은 별도로 다수의 필터들이 필요하고 또, 도트를 인쇄하거나 필름코팅 등의 방법으로 형성해야 하며, 이러한 다수의 부품들을 조립해야 하기 때문에, 제작공정이 복잡하고 불편하여 작업성, 생산성의 저하를 가져왔다.The conventional light guide plate unit configured as described above requires a plurality of filters separately, and should be formed by printing dots or film coating, and as such a plurality of parts must be assembled, the manufacturing process is complicated and inconvenient. , Brought about a decrease in productivity.

이와같은 문제점은 도광판(101)을 상하 두장의 아크릴판 또는 반사판 및 투광판으로 구성하는 분리형 도광판에서도 나타난다.This problem also occurs in the split type light guide plate including the light guide plate 101 composed of two upper and lower acrylic plates or reflecting plates and light transmitting plates.

종래의 도광판은 램프를 도광판면에 밀착시키기 대문에 빛이 도광판면에 침투하는데 손실이 크고, 도광판에서 나오는 빛을 확산시키기 위하여 별도의 빛확산용 필터를 사용하기 때문에 빛이 필터를 투과함으로 인한 손실초래 및 부품수 증가의 문제점이 있었다.The conventional light guide plate has a high loss of light penetrating the surface of the light guide plate because the lamp is in close contact with the light guide plate surface, and a loss due to light passing through the filter because a separate light diffusion filter is used to diffuse the light from the light guide plate. There was a problem of causing and increasing the number of parts.

또한 종래의 도광판은 도광판에 침투한 빛을 반사시키기 위하여 도트형태를 도광판 뒷면에 분포시키기 때문에 빛의 반사효율이 낮고 도광판 가장자리면을 단순히 빛의 유출을 방지하기 위하여 막아주었기 때문에 이 부분에서의 빛의 손실 또한 적지 않았다.In addition, the conventional light guide plate distributes the dot shape to the back side of the light guide plate to reflect the light penetrating the light guide plate, so the light reflection efficiency is low and the edge of the light guide plate is simply blocked to prevent the light leakage. The losses were also small.

본 발명은 도광판에서 출력되는 빛이 도광판 전면에 걸쳐서 균일한 밝기가 되도록 하기 위한 반사수단을 도광판에 일체로 형성하고, 도광판에서 출력되는 빛의 필터링을 위한 필터수단을 도광판에 일체로 형성함으로써 구성을 간소화시킨 액정표시기의 백라이트유닛 도광판을 제공한다.The present invention provides a configuration by integrally forming a reflecting means on the light guide plate so that the light output from the light guide plate has a uniform brightness across the light guide plate, and integrally forming filter means on the light guide plate for filtering the light output from the light guide plate. Provided is a backlight unit light guide plate of a simplified liquid crystal display.

또한, 본 발명은 램프에서 도광판으로 진입하는 빛의 진입로를 직진로로 구성함으로써 빛의 직진성과 평행성을 확보한 액정표시기의 백라이트유닛 도광판을 제공한다.In addition, the present invention provides a backlight unit light guide plate of the liquid crystal display to ensure the straightness and parallelism of the light by configuring the access path of the light entering the light guide plate from the lamp to the straight path.

또한, 본 발명은 도광판의 종단면과 측단면을 일정한 각도로 경사지게 형성하고 이 곳을 반사처리함으로써 빛의 효율을 높일 수 있도록 한 액정표시기의 백라이트유닛 도광판을 제공한다.In addition, the present invention provides a backlight unit light guide plate of the liquid crystal display to increase the efficiency of the light by forming the end surface and the side cross-section of the light guide plate at an angle to be inclined at a predetermined angle.

도1은 종래의 액정표시기의 백라이트유닛 도광판의 분해 사시도1 is an exploded perspective view of a backlight unit light guide plate of a conventional liquid crystal display;

도2는 본 발명의 액정표시기의 백라이트유닛 도광판의 제 1 실시예 사시도Figure 2 is a perspective view of a first embodiment of a backlight unit light guide plate of the liquid crystal display of the present invention

도3은 본 발명의 액정표시기의 백라이트유닛 도광판의 제 2 실시예 사시도Figure 3 is a perspective view of a second embodiment of the backlight unit light guide plate of the liquid crystal display of the present invention

도4는 본 발명의 도광판의 필터구조의 예를 나타낸 도면4 shows an example of a filter structure of a light guide plate of the present invention;

도5는 본 발명의 도광판의 반사구조의 예를 나타낸 도면5 shows an example of a reflective structure of a light guide plate of the present invention;

본 발명의 액정표시기의 백라이트유닛 도광판의 제 1 실시예를 도2에 나타내었다.A first embodiment of a backlight unit light guide plate of the liquid crystal display of the present invention is shown in FIG.

도2의 도광판은 일체형으로서, 평판형이며 종단으로 갈수록 그 단면 두께가 감소하는 테이퍼형의 도광판(201)의 일측면에 램프(202)를 램프커버(203)로 설치하고, 상기 램프(202)에서 출력된 빛이 도광판내로 진입하는 진입로(l1)를 동일한 두께로 형성하였다.The light guide plate of FIG. 2 is an integrated type, and is provided with a lamp cover 203 as a lamp cover 203 on one side of a tapered light guide plate 201 having a flat plate shape and whose cross section thickness decreases toward the end. An access path (l1) into which the light outputted from the light guide plate enters is formed in the same thickness.

진입로(l1)는 램프커버 및 램프커버가 씌워지는 부분에 해당하며, 진입로(l1)를 같은 두께로 만들었기 때문에 도광판(201)내에 침투한 빛의 평행성을 높여준다.The access road l1 corresponds to a portion on which the lamp cover and the lamp cover are covered, and because the access road l1 is made to have the same thickness, the parallel of the light penetrating into the light guide plate 201 is increased.

그리고 램프(202)가 도광판(201)내에 삽입되기 때문에 램프(202)에서 출력된 빛을 도광판(201)내에 보다 많이 침투시킬 수 있다.And since the lamp 202 is inserted into the light guide plate 201, the light output from the lamp 202 can be more penetrated into the light guide plate 201.

또한, 진입로(l1)가 같은 두께를 유지하기 때문에 4각기둥 형태의 램프도 도광판(201)내에 삽입하는 구조가 가능하게 된다.In addition, since the access paths l1 maintain the same thickness, the structure of inserting the quadrangular lamp into the light guide plate 201 is also possible.

한편, 도광판(201)의 측단면부(204)는 일정한 각도로 경사지게 형성하고, 이 곳에 페인트, 도금, 알루미늄 증착 또는 반사판을 형성함으로써, 도광판내의 빛의 반사를 유도하여 도광판면의 빛의 효율을 증대시켜 준다.On the other hand, the side end portion 204 of the light guide plate 201 is formed to be inclined at a predetermined angle, and paint, plating, aluminum deposition or reflecting plate is formed therein, thereby inducing reflection of light in the light guide plate to improve the efficiency of light on the light guide plate surface. Increase.

또한, 도광판(201)의 종단면부(205)도 일정한 각도로 경사지게 형성하고, 이 곳에 페인트, 도금, 알루미늄 증착 또는 반사판을 형성함으로써, 도광판내의 빛의 반사를 유도하여 도광판면의 빛의 효율을 증대시켜 준다.In addition, the longitudinal end portion 205 of the light guide plate 201 is also formed to be inclined at a predetermined angle, and paint, plating, aluminum deposition, or a reflection plate is formed therein, thereby inducing reflection of light in the light guide plate to increase the efficiency of light on the light guide plate surface. Let it be.

한편, 도광판(201)의 아랫면 바깥쪽으로 양각 또는 음각의 방법으로 특정한 형태의 반사라인(206)을 밀도를 달리하여 분포시켰다.On the other hand, the reflection line 206 of a specific shape is distributed in different densities by using an embossed or intaglio method to the outside of the lower surface of the light guide plate 201.

이 라인(206)은 도5에 나타낸 바와같이 그 단면이 삼각형(a), 반원형(b), 사각형(c), 1/4원형(d)의 형태로 형성하며, 곡선 또는 직선 형태로 형성한다.This line 206 is formed in the shape of a triangle (a), a semicircle (b), a rectangle (c), a quarter circle (d), and has a curved or straight line shape as shown in FIG. .

이 곡선 또는 직선라인(206)의 밀도 또는 굵기를 달리함으로써, 램프(202)로부터 출력되어 도광판(201)내로 침투한 빛의 전면에 걸쳐서 고른 밝기로 반사된다.By varying the density or thickness of this curved or straight line 206, it is reflected at even brightness over the entire surface of the light output from the lamp 202 and penetrated into the light guide plate 201.

이 라인(206)은 램프(202)가 삽입된 부분부터 그 종단까지 점차적으로 많이 분포시키거나 또는 곡선의 굵기를 달리하여 도광판(201)내부에서 도광판(201)의 앞면(윗면)으로 반사되어 나오는 빛의 양과 세기를 고르게 만들어 준다.The line 206 is gradually distributed from the portion where the lamp 202 is inserted to the end thereof, or is reflected from the inside of the light guide plate 201 to the front surface (top) of the light guide plate 201 by varying the thickness of the curve. Make the amount and intensity of light even.

한편, 도광판(201)의 앞면(윗면)으로 나오는 빛을 상하좌우로 동시에 분산시키기 위하여 도광판(201)의 앞면 바깥쪽으로 가로,세로 같은 모양의 양각 또는 음각으로 필터라인(207)을 형성하였다.On the other hand, in order to simultaneously distribute the light emitted from the front (upper surface) of the light guide plate 201 up, down, left and right at the same time, the filter line 207 is formed in the embossed or intaglio of the horizontal and vertical shape to the outside of the front of the light guide plate 201.

이 필터라인(207)은 도4에 나타낸 바와같이 그 단면이 반원형(a), 오각형(b), 삼각형(c) 또는 사각형(d)등 다양한 형태로 만들어준다.As shown in FIG. 4, the filter line 207 has a cross section made into various shapes such as a semicircle (a), a pentagon (b), a triangle (c) or a rectangle (d).

이 필터라인(207)은 도광판(201)의 앞면에서 나오는 빛을 최대한 확산시켜 줌으로써 최대한의 시각을 확보한다.The filter line 207 ensures maximum visibility by diffusing light emitted from the front surface of the light guide plate 201 as much as possible.

이 필터라인(207)은 도광판(201)의 앞면에서 나오는 빛을 상하좌우 동시에 분산시키기 위하여 일정한 모양으로 일정한 간격과 굵기를 가지고 분포시켜 줌으로써 도광판(201)의 앞면 어느 곳에서나 같은 확산효과를 가지도록 하였다.The filter line 207 is distributed at regular intervals and thicknesses in a predetermined shape in order to disperse light emitted from the front surface of the light guide plate 201 up, down, left and right at the same time so as to have the same diffusion effect anywhere in the front surface of the light guide plate 201. It was.

도3은 본 발명의 액정표시기의 백라이트유닛 도광판의 제 2 실시예로서 분리형의 경우이다.Figure 3 is a second embodiment of the backlight unit light guide plate of the liquid crystal display of the present invention in the case of a separate type.

분리형 도광판의 경우는 상하 두장의 도광판(201a,201b)으로 이루어지며, 상기 도2에 표시한 바와 동일한 구성요소에 대해서는 동일한 부호로 표기하여 중복되는 설명은 생략한다.In the case of the separate light guide plate, the light guide plate 201a and 20b is formed of two upper and lower sides, and the same components as shown in FIG. 2 are denoted by the same reference numerals and redundant description thereof will be omitted.

분리형 도광판(201a,201b)은 필터라인(207)을 도광판(201b)의 바깥쪽이나 안쪽 어느곳에 양각 또는 음각으로 형성하여도 무방하다.The separate light guide plates 201a and 201b may have the filter line 207 embossed or engraved on either the outside or the inside of the light guide plate 201b.

분리형 도광판(201a,201b)의 진입로(l1)속으로 램프(202)가 삽입된다.The lamp 202 is inserted into the access path l1 of the split light guide plates 201a and 201b.

이러한 진입로, 측단면 및 종단면, 그리고 반사라인 및 필터라인의 작용효과는 상기 도2의 일체형의 그 것과 동일하다.The effects of these ramps, side and longitudinal sections, and the reflective and filter lines are the same as those of the integral type of FIG.

본 발명은 램프를 도광판내에 삽입함으로써 램프에서 나오는 모든 빛을 거의 도광판내로 침투시킬 수 있고 또한 도광판 측단면이나 종단면에 반사수단을 구비함으로써 반사효율을 더욱 높일 수 있다.According to the present invention, by inserting the lamp into the light guide plate, almost all light emitted from the lamp can be penetrated into the light guide plate, and the reflection efficiency can be further increased by providing reflecting means on the side surface or the longitudinal section of the light guide plate.

본 발명은 램프커버를 일정한 길이만큼 유지하고 또 도광판 커버가 씌워지는 부분까지는 같은 두께를 유지하여 빛의 평행성을 확보하는 것은 물론 도광판 램프 삽입면의 반대쪽 끝까지 고르게 빛이 침투하게 되었다.The present invention maintains the lamp cover by a constant length and maintains the same thickness up to the portion where the light guide plate cover is covered to ensure parallelism of light, and even light penetrates to the opposite end of the light guide plate lamp insertion surface.

본 발명은 도광판과 일체로 반사라인과 필터라인을 형성함으로써 구성부품수를 줄였고(작업성, 생산성 향상), 반사라인의 굵기나 밀도를 다르게 함으로써 빛의 균일한 출력을 가능하게 하였으며 고른 확산을 확보하였다.The present invention reduces the number of components (workability, productivity) by forming reflective lines and filter lines integrally with the light guide plate, and enables uniform output of light by varying the thickness and density of the reflective lines, thereby ensuring even diffusion. It was.

Claims (3)

평판형이고 종단으로 갈수록 점차 단면 두께가 가늘어지는 테이퍼형의 일체형 또는 분리형 도광판에 램프커버에 의해서 일측방에 고정된 램프로부터 출력된 빛이 반사되어 그 반사된 빛에 의해서 액정표시기기의 백라이트 조사를 수행하는 백라이트 유닛에 있어서,The light output from the lamp fixed to one side by the lamp cover is reflected on the tapered integrated or separate light guide plate that is flat and gradually thinner in cross section toward the end and the backlight irradiation of the liquid crystal display device is performed by the reflected light. In the backlight unit to perform, 상기 도광판의 아랫면에 빛의 균일한 반사를 위해서 그 밀도 또는 굵기를 달리하는 반사라인을 일체로 형성하고, 상기 도광판의 윗면에는 종횡으로 빛의 균일한 확산을 위한 필터라인을 일체로 형성한 것을 특징으로 하는 액정표시기의 백라이트유닛 도광판.In order to uniformly reflect the light on the lower surface of the light guide plate, the reflection lines having different density or thickness are integrally formed, and the filter line for uniform diffusion of light vertically and horizontally is integrally formed on the upper surface of the light guide plate. A backlight unit light guide plate of a liquid crystal display. 제 1 항에 있어서, 상기 반사라인과 필터라인이 일체로 형성된 도광판의 측단면 및 종단면에서 빛의 반사가 이루어지도록 소정각도로 경사지게 형성하고 여기에 반사수단을 형성한 것을 특징으로 하는 액정표시기의 백라이트유닛 도광판.The backlight of the liquid crystal display according to claim 1, wherein the reflection line and the filter line are formed to be inclined at a predetermined angle so that the light is reflected from the side end surface and the end surface of the light guide plate which are integrally formed. Unit light guide plate. 제 1 항 또는 제 2 항에 있어서, 상기 램프에서 출력된 빛이 도광판으로 침투하는 진입로의 두께를 일정하게 하여 빛을 평행하게 침투시키는 것을 특징으로 하는 액정표시기의 백라이트유닛 도광판.The backlight unit light guide plate of claim 1 or 2, wherein the light output from the lamp is made to have a constant thickness of an entry path that penetrates the light guide plate to penetrate the light in parallel.
KR1019970070839A 1997-12-19 1997-12-19 Back light unit of light plate for liquid crystal display KR100291242B1 (en)

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Cited By (1)

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US9632234B2 (en) 2012-08-08 2017-04-25 Samsung Display Co., Ltd. Light guide plate, backlight unit including the same and liquid crystal display including the backlight unit

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US6607279B2 (en) * 2000-09-18 2003-08-19 Kabushiki Kaisha Toyota Jidoshokki Light guiding plate
KR20050035582A (en) * 2003-10-13 2005-04-19 그래피온 테크놀로지즈 유에스에이, 엘엘씨 Light guide plate which is wholly formed with horizontal prism and vertical prism
JP4548254B2 (en) * 2005-07-21 2010-09-22 オムロン株式会社 Surface light source device
KR100775633B1 (en) * 2006-02-20 2007-11-13 주식회사 나모텍 Light guiding plate for Back Light
KR20140013218A (en) * 2012-07-20 2014-02-05 제일모직주식회사 Light guide plate, method for preparing the same, back light unit comprising the same and liquid crystal display comprising the same

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JPH09197400A (en) * 1996-01-23 1997-07-31 Hitachi Ltd Liquid crystal display device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9632234B2 (en) 2012-08-08 2017-04-25 Samsung Display Co., Ltd. Light guide plate, backlight unit including the same and liquid crystal display including the backlight unit

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