KR20030089732A - Back light unit using prism reflective sheet - Google Patents

Back light unit using prism reflective sheet Download PDF

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Publication number
KR20030089732A
KR20030089732A KR1020020027574A KR20020027574A KR20030089732A KR 20030089732 A KR20030089732 A KR 20030089732A KR 1020020027574 A KR1020020027574 A KR 1020020027574A KR 20020027574 A KR20020027574 A KR 20020027574A KR 20030089732 A KR20030089732 A KR 20030089732A
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KR
South Korea
Prior art keywords
light
light guide
guide plate
prism
light source
Prior art date
Application number
KR1020020027574A
Other languages
Korean (ko)
Inventor
윤태중
Original Assignee
나노엘시디(주)
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Publication date
Application filed by 나노엘시디(주) filed Critical 나노엘시디(주)
Priority to KR1020020027574A priority Critical patent/KR20030089732A/en
Publication of KR20030089732A publication Critical patent/KR20030089732A/en

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Classifications

    • 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
    • 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
    • G02B6/005—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
    • G02B6/0055—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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides

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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 device for a background light source using a prism reflection sheet is provided to eliminate any steps for correcting the direction of light with a reflection sheet and a diffusion sheet. CONSTITUTION: A device for a background light source using a prism reflection sheet includes a light source(1), a light guide panel(2) and a prism-shaped reflection sheet(3). The light incident to the light guide panel advances from a first surface of the light guide panel and the inside of the first surface of the light guide panel. The light guide panel has a pattern alternated with smooth slant surfaces and steep slant surfaces. The light incident to the slant surfaces of the light guide panel advances toward the reflection sheet and an LCD. The slant surfaces reflect the light to be perpendicularly incident to the LCD, thereby controlling the angle of the light.

Description

프리즘 반사씨트를 이용한 후면 광원용 장치{Back light unit using prism reflective sheet}Back light unit using prism reflective sheet

본 발명은 액정표시장치의 광원장치에 관한 것으로 상세하게는 일정한 형상을 갖는 반사씨트를 사용하여 반사씨트에서 반사하는 빛의 방향을 조절하고 이를 통해 프리즘 씨트가 없는 후면광원용 장치를 만드는 것에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device of a liquid crystal display device, and more particularly, to a device for controlling a direction of light reflected from a reflection sheet using a reflection sheet having a predetermined shape and thereby making a device for a back light source without a prism sheet. .

후면 광원용 장치의 일반적인 경우는 도 1의 경우 또는 그와 비슷한 구조를 가지고 있으며 반사씨트, 도광판, 확산씨트, 세로방향 프리즘 씨트, 가로방향 프리즘씨트로 구성되어있다. 도광판은 보통 플라스틱 재질의 평판으로 배면이나 전면에 일정한 형상을 가진 패턴을 설치하여 빛이 빠져나오도록 되어있다. 반사씨트는 도광판의 배면으로 나오는 빛을 반사시켜 다시 도광판으로 들어가게하는 역할을 하고 확산 씨트는 도광판에서 빠져나온 빛의 방향을 분산시킨다. 프리즘 씨트 두 장은 분산되어 사방으로 향하는 빛을 각각 세로 방향과 가로 방향으로 다시 모아주는 역할을 한다. 일반적인 부식형 후면 광원용 장치의 경우 도광판에서 빠져나오는 빛은 도광판의 배면에대하여 거의 누워있고 누운 방향은 광원과 반대이다. 따라서 이 빛을 액정표시장치용 광원으로 사용하려면 별도의 광학기능을 가진 기구를 이용하여 방향을 바꾸어주어야 한다. 이것이 일반적인 후면 광원용 장치에서 도광판 외에 별도의 씨트들이 필요한 이유이다.The general case of the rear light source device has a structure similar to that of FIG. 1 or the like, and is composed of a reflective sheet, a light guide plate, a diffusion sheet, a longitudinal prism sheet, and a horizontal prism sheet. The light guide plate is a flat plate made of plastic, and light is emitted by installing a pattern having a certain shape on the back or front surface. The reflective sheet reflects the light emitted from the back of the light guide plate and enters the light guide plate again, and the diffuse sheet disperses the direction of light emitted from the light guide plate. The two prism sheets serve to scatter the light scattered in all directions in the vertical and horizontal directions, respectively. In the case of a general corrosive back light source device, the light from the light guide plate is almost lying on the back of the light guide plate and the lying direction is opposite to the light source. Therefore, in order to use this light as a light source for a liquid crystal display, the direction must be changed by using a mechanism having a separate optical function. This is why separate sheets are needed in addition to the light guide plate in the general rear light source device.

일반적인 후면 광원용 장치에서 빛은 굴절률의 차이가 큰 층들을 여러번 통과하면서 많은 양이 흡수된다. 일례로 도광판에서 나온 빛인 확산씨트와 두장의 프리즘 씨트를 통과하는 비율은 40%에도 이르지 못한다. 또 씨트 네 장과 도광판 한 장으로 이루어지는 구성은 부품이 많아 가격 상승과 두께를 키우는 요인이다.In a typical back-light source device, light is absorbed in large amounts through multiple layers of high refractive index. For example, less than 40 percent of the light from the light guide plate passes through the diffusion sheet and the two prism sheets. In addition, the composition of four sheets and one light guide plate is a factor that increases prices and increases thickness due to the large number of parts.

본 발명은 상기한 문제점을 해결하기위하여 프리즘 형상을 갖는 반사씨트와 완사면과 경사면이 주기적으로 교차하는 패턴을 가진 도광판을 이용하여 종래의 후면광원용 장치에서 프리즘 씨트를 제거하고자 하는 것이다.The present invention is to remove the prism sheet in the conventional device for the rear light source by using a light guide plate having a pattern in which the reflective sheet having a prism shape and the slope and the inclined surface periodically intersect to solve the above problems.

도 1은 일반적인 후면광원용 장치를 나타내는 단면도1 is a cross-sectional view showing a device for a general back light source

도 2는 본 발명품 내에서 빛의 경로를 나타내기위한 예시 단면도2 is an exemplary cross-sectional view for showing a path of light within the present invention.

계면1 : 반사씨트와 공기의 경계면Interface 1: Interface between Reflective Sheet and Air

계면2 : 도광판 패턴의 경사면과 공기의 경계면Interface 2: Interface between the inclined surface of the light guide plate pattern and the air

1 : 광원 2 : 도광판1: light source 2: light guide plate

3 : 프리즘 반사씨트3: prism reflective sheet

4 : 도광판 패턴의 경사면에서 반사하여 수직으로 나오는 빛4: Light reflected vertically from the inclined surface of the light guide plate pattern

5 : 도광판 패턴의 경사면을 투과한 후 반사씨트에서 반사하여 수직으로 나오는 빛5: Light that passes through the inclined surface of the light guide plate pattern and then is reflected from the reflective sheet and emitted vertically

이하 첨부된 도면에 의하여 자세히 설명하면 다음과 같다.Hereinafter, described in detail with reference to the accompanying drawings.

도 2에서 광원 1로부터 도광판 2로 입사한 광속은 계면1과 계면1의 도광판 내부 반대면에서 전반사하면서 진행해 간다. 도광판에서 입광면의 법선과 광속이 이루는 각을 광속의 진행각이라고 하면 패턴의 완사면에 부딪힌 광속은 진행각이 점점 작아진다. 또 광원 1로부터 도광판 2로 입사하는 광속은 도광판의 재질이 아크릴인 경우 스넬의 굴절법칙때문에 입광면의 법선에 대하여 42도 이내의 각을 갖는다. 이 각은 도광판의 패턴 반대면에서 광속이 빠져나갈 수 없는 각도이다. 따라서 도광판 패턴의 경사면에 부딪히지 않는 광속은 도광판에서 빠져나오지 못하고 반입광부까지 진행한다.In FIG. 2, the light beams incident from the light source 1 into the light guide plate 2 proceed with total reflection on the inner surface of the light guide plate at the interface 1 and the interface 1. When the angle formed between the normal line of the light incident surface and the light beam in the light guide plate is the propagation angle of the light beam, the propagation angle of the light beam hitting the gentle slope of the pattern becomes smaller. The light beam incident from the light source 1 to the light guide plate 2 has an angle of 42 degrees or less with respect to the normal of the light incident surface when the material of the light guide plate is acrylic. This angle is the angle at which the light beam cannot escape from the opposite side of the pattern of the light guide plate. Therefore, the luminous flux that does not strike the inclined surface of the light guide plate pattern does not escape from the light guide plate and proceeds to the incoming light incident portion.

도광판 패턴의 경사면에 부딪힌 광속은 반사씨트 쪽으로 투과하는 빛 5와 반사하여 LCD로 향해가는 빛 4로 나뉜다. 도광판 패턴의 경사면은 반사하여 LCD로 향하는 광속이 LCD기판에 수직으로 입사하도록 그 각이 조정되어있다.The luminous flux impinging on the inclined surface of the light guide plate pattern is divided into light 5 transmitted toward the reflective sheet and light 4 reflected and directed toward the LCD. The angle of inclination of the light guide plate pattern is adjusted so that the luminous flux toward the LCD is incident perpendicularly to the LCD substrate.

도광판 패턴의 경사면에서 반사씨트쪽으로 투과한 광속은 반사씨트에서 반사하여 LCD로 향해간다. 반사씨트는 이 광속이 LCD기판에 수직으로 입사하도록 그 각이 조정되어있다.The light beam transmitted from the inclined surface of the light guide plate toward the reflective sheet is reflected by the reflective sheet and directed toward the LCD. The reflection sheet is angled so that this light beam is incident perpendicular to the LCD substrate.

본 발명에서 LCD기판에 도달하는 빛이 지나오는 경로는 도 2에서 4와 5의 단 두가지 경로 외에 없다. 도광판의 내부에서 광속은 반사하면서 여러번 그 진행각이바뀌지만 경로 4에서 도광판 패턴의 경사면에서 반사하는 경우와 경로 5에서 반사씨트에서 반사하는 경우 이외에는 전반사의 방법으로만 진행각이 바뀐다.In the present invention, the path through which the light reaches the LCD substrate passes through only two paths of 4 and 5 in FIG. 2. While the light flux inside the light guide plate changes its propagation angle several times, the propagation angle is changed only by the total reflection method except for reflection on the inclined surface of the light guide plate pattern in path 4 and reflection on the reflection sheet in path 5.

본 발명에서 도광판의 LCD기판 쪽으로 나오는 광속은 이미 LCD용 광원으로 사용하기에 적합한 상태에 있다. 따라서 별도의 프리즘 씨트를 사용하여 진행방향을 교정할 필요가 없다. 따라서 구성부품의 수를 줄여 비용을 줄일 수있고 슬림화할 수 있다. 본 발명품 내에서 빛은 종래의 후면광원용 장치에 비하여 아주 간단한 경로를 갖는다. 따라서 흡수의 가능성을 줄여 높은 휘도를 갖는 LCD용 후면 광원용창치를 얻을 수 있다.In the present invention, the luminous flux emitted toward the LCD substrate of the light guide plate is already in a state suitable for use as a light source for LCD. Therefore, it is not necessary to correct the traveling direction by using a separate prism sheet. Therefore, the number of components can be reduced and the cost can be reduced and slimmed. In the present invention, light has a very simple path compared to conventional back light source devices. Therefore, the possibility of absorption can be reduced, and the window light source for the back light source having high luminance can be obtained.

Claims (1)

경사면과 완사면이 주기적으로 교차하는 패턴형상을 가진 도광판과 프리즘 형상을 갖는 반사씨트를 결합하여 종래의 LCD용 후면광원용 장치에서 프리즘 씨트및 확산씨트를 제거한 후면광광원용 장치Back light source device that removes prism sheet and diffused sheet from conventional LCD back light source device by combining light guide plate with pattern shape where inclined surface and gentle surface periodically cross and reflecting sheet having prism shape
KR1020020027574A 2002-05-18 2002-05-18 Back light unit using prism reflective sheet KR20030089732A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101102743B1 (en) * 2009-04-16 2012-01-05 김준엽 Double-faced color is that differented plastic product injection device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000024963A (en) * 1998-10-07 2000-05-06 김영환 Back light unit
JP2002109932A (en) * 2000-10-03 2002-04-12 Enplas Corp Flat light source device and image display device
JP2002124115A (en) * 2000-08-08 2002-04-26 Yuka Denshi Co Ltd Flat light source device, and liquid crystal display device using the same
JP2002133928A (en) * 2000-10-24 2002-05-10 Alpine Electronics Inc Illuminating apparatus
KR20030052612A (en) * 2001-12-21 2003-06-27 엘지.필립스 엘시디 주식회사 The backlight unit
KR20030082251A (en) * 2002-04-17 2003-10-22 삼성전자주식회사 Liquid crystal display apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000024963A (en) * 1998-10-07 2000-05-06 김영환 Back light unit
JP2002124115A (en) * 2000-08-08 2002-04-26 Yuka Denshi Co Ltd Flat light source device, and liquid crystal display device using the same
JP2002109932A (en) * 2000-10-03 2002-04-12 Enplas Corp Flat light source device and image display device
JP2002133928A (en) * 2000-10-24 2002-05-10 Alpine Electronics Inc Illuminating apparatus
KR20030052612A (en) * 2001-12-21 2003-06-27 엘지.필립스 엘시디 주식회사 The backlight unit
KR20030082251A (en) * 2002-04-17 2003-10-22 삼성전자주식회사 Liquid crystal display apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101102743B1 (en) * 2009-04-16 2012-01-05 김준엽 Double-faced color is that differented plastic product injection device

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