KR20040019202A - Unified light guide bar - Google Patents

Unified light guide bar Download PDF

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Publication number
KR20040019202A
KR20040019202A KR1020020050873A KR20020050873A KR20040019202A KR 20040019202 A KR20040019202 A KR 20040019202A KR 1020020050873 A KR1020020050873 A KR 1020020050873A KR 20020050873 A KR20020050873 A KR 20020050873A KR 20040019202 A KR20040019202 A KR 20040019202A
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KR
South Korea
Prior art keywords
light
light guide
guide plate
guide bar
light source
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KR1020020050873A
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Korean (ko)
Inventor
하철근
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하철근
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Priority to KR1020020050873A priority Critical patent/KR20040019202A/en
Publication of KR20040019202A publication Critical patent/KR20040019202A/en

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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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/76—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a filling of permanent gas or gases only
    • H01J61/78—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a filling of permanent gas or gases only with cold cathode; with cathode heated only by discharge, e.g. high-tension lamp for advertising
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • F21V2200/20—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of a generally planar shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Planar Illumination Modules (AREA)

Abstract

PURPOSE: A light guide bar integrated into a light guide panel is provided to obtain a light guide panel without any additional light source. CONSTITUTION: A light guide bar integrated into a light guide panel includes a thin and transparent acryl bar as the light guide bar(2). The light guide bar has a predetermined pattern for changing the advancing direction of light and forwarding the light to the light guide panel(4). The light emitted from light emitting diodes advances radially. The light guide bar changes the advancing direction of the light by inducing grooves(3) of the pattern toward an active area of the light guide panel, while controlling the direction and distribution of the light.

Description

도광판 일체형 라이트가이드 바{Unified light guide bar}Light guide plate integrated light guide bar {Unified light guide bar}

후면광원용 장치의 일반적인 경우는 광원의 빛을 안내하는 도광판이 있고, 도광판의 밑면에는 일정한 형상을 가지고 있는 패턴이 있어서 도광판을 따라 진행하는 빛의 일부가 패턴의 형상에 따라 도광판으로부터 탈출할 수 있도록 되어있다. 후면광원용 장치는 도광판이외에도 도광판의 패턴면 쪽에 반사씨트, 그 반대쪽에 확산씨트,수직방향프리즘 씨트와 수평방향 프리즘 씨트로 구성되어있다. 패턴이 에칭타입인 경우 도광판의 빛은 패턴부에서 산란하여 일부는 반사씨트로 향해가고 일부는 확산씨트 쪽으로 향해간다. 반사씨트로 향한 빛은 반사되어 다시 도광판으로 돌아오고, 확산씨트로 향해간 빛은 대광부쪽으로 누워있는 분포를 가지고 있어 확산씨트가 이를 사방으로 분산시키고 두장의 프리즘 씨트가 각각 수직과 수평방향으로 이를 모아주는 구실을 한다. 일반적인 후면광원용 장치에서는 빛은 굴절률의 차이가 큰 층들을 여러번 반복하여 통과하므로 심각할 정도로 흡수된다. 일례로 확산씨트와 두 장의 프리즘씨트는 법선방향의 빛에 대하여 단지 57%만 투과한다. 도광판으로부터 입사하는 빛은 씨트의 법선을 기준으로 대체로 40도 방향에서 입사하므로 그 투과율은 30%에도 미치지 못한다. 따라서 기존의 후면광원용 장치로는 휘도를 향상시키는데 있어 구조적 한계를 가지고 있다. 또 씨트 네장으로 이루어진 구조는 부품이 많아 가격 상승의 요인이다.The general case of the back light source device is a light guide plate for guiding the light of the light source, there is a pattern having a certain shape on the bottom of the light guide plate so that part of the light traveling along the light guide plate can escape from the light guide plate according to the shape of the pattern It is. In addition to the light guide plate, the back light source device is composed of a reflection sheet on the pattern surface side of the light guide plate, a diffusion sheet on the opposite side, a vertical prism sheet and a horizontal prism sheet. When the pattern is an etching type, the light of the light guide plate is scattered in the pattern portion, partly toward the reflection sheet and partly toward the diffusion sheet. The light directed to the reflected sheet is reflected and returned to the light guide plate, and the light directed toward the diffused sheet has a distribution lying on the light guide, so that the diffuse sheet scatters it in all directions and the two prism sheets distribute it vertically and horizontally. Play the role of collecting. In a typical back light source device, light passes through layers with a large difference in refractive index several times and is absorbed seriously. For example, the diffusion sheet and the two prism sheets transmit only 57% of the normal light. Since light incident from the light guide plate is incident in a direction of 40 degrees based on the normal of the sheet, its transmittance is less than 30%. Therefore, the conventional rear light source device has a structural limitation in improving the brightness. In addition, the four-sheet structure has many parts, which is a factor in the price increase.

상기한 문제점을 해결하고 씨트가 없는 후면광원용 장치를 만들기 위하여 동종업계 모두가 많은 노력을 경주하고 있다. 그러나 광원 LED의 특성상 무질서하게 존재하는 빛의 진로를 씨트가 없는 상태에서 제어하기는 힘든 일이다. 따라서 씨트가 없는 후면광원용 장치를 만드는 데 있어 제어할 수 있는 광원을 확보하는 것은 중요한 일이다. 본 발명의 목적은 별도의 광학기구 없이도 도광판 만으로 정렬된 광원을 얻고자하는 데 있다.In order to solve the above problems and to create a sheetless rear light source device, all of the same industry are making great efforts. However, due to the characteristics of the light source LED, it is difficult to control the path of light that exists randomly without a seat. Therefore, it is important to have a controllable light source when making a sheetless back light source device. An object of the present invention is to obtain a light source aligned with only the light guide plate without a separate optical device.

도 1은 일반적인 light guide bar(이하 LGB)에서 빛의 경로를 나타내기위한 평면도1 is a plan view for showing the light path in a typical light guide bar (hereinafter LGB)

도 2는 본 발명품 내에서 빛의 경로를 나타내기위한 평면도2 is a plan view for showing the path of light within the invention

1 : 종래의 LGB 2 : 광원(본 발명품 내에서 LED)1: conventional LGB 2: light source (LED in the present invention)

3 : 본 발명품 내에서 빛의 경로를 바꾸기위해 설치한 유도 홈3: Induction groove installed to change the light path in the present invention

4 : 도광판4: light guide plate

5, 6 : 종래의 제품 내에서의 빛의 진행경로5, 6: Path of light in conventional products

7, 8 : 본 발명품의 내에서의 빛의 진행경로7, 8: light propagation path in the present invention

이하 첨부된 도면에 의해 자세히 설명하면 다음과 같다.Hereinafter, described in detail by the accompanying drawings as follows.

도 1은 종래에 일반적으로 LCD의 전면광원용 장치에 사용하는 LGB이다.1 is a LGB conventionally used for a front light source device of an LCD.

빛은 광원 2로부터 나와 바로 도광판으로 입사하지 않고 가늘고 투명한 아크릴 막대 2 즉 LGB로 입사한다. LGB는 도광판의 반대면에 빛의 방향을 바꿀 수 있도록 일정한 형태의 패턴을 가지고 있다. LGB에 입사한 빛은 도면에 표기한 것처럼 패턴에서 반사하여 도광판을 향할 수 있도록 진행방향이 바뀐다. 결과적으로 점광원 2로부터 출발한 빛은 선광원으로 바뀐 후 도광판에 입사한다.Light does not enter the light guide plate directly from the light source 2 but enters the thin transparent acrylic rod 2, LGB. LGB has a certain pattern to change the direction of light on the opposite side of the LGP. The light incident on the LGB is changed in the traveling direction so that the light is reflected from the pattern toward the light guide plate as shown in the drawing. As a result, the light starting from the point light source 2 enters the light guide plate after being converted into the line light source.

도 2는 본 발명품으로 주로 후면광원용 장치에 사용하는 것을 목표로 개발된 것이다. 본 발명품은 LGB와 도광판이 분리되어있지 않고 일체화되어있다. 광원 2로부터 도광판 4로 입사하는 빛은 LED의 각도별 광분포 특성, LED를 감싸고 있는 도광판의 입광부 구조 등에 의하여 도광판의 입광부에서 일정한 각도별 분포특성을 가지고 방사상으로 진행한다.Figure 2 is developed with the aim of using the apparatus mainly for the back light source as the present invention. In the present invention, the LGB and the light guide plate are integrated without being separated. The light incident from the light source 2 to the light guide plate 4 proceeds radially with constant angle distribution characteristics at the light incidence part of the light guide plate due to the light distribution characteristics of the LEDs and the light incidence structure of the light guide plate surrounding the LEDs.

도 2에서 유도홈 3은 이 빛을 도 2의 8처럼 바로 방향을 바꾸어 도광판으로 입사하도록 할 수도 있고 7처럼 입사지점을 변경시켜 입사하게 할 수도 있다. 즉 유도홈 3은 도광판의 active area에 입사하는 빛의 방향과 분포량을 모두 조절 할 수 있다.In FIG. 2, the guide groove 3 may change the direction of the light directly to the light guide plate as shown in FIG. 2, or may change the incidence point to enter the light as shown in FIG. 2. That is, the guide groove 3 can adjust both the direction and the distribution of light incident on the active area of the light guide plate.

본 발명품의 내부에서 빛의 진로 및 방향의 변경은 모두 전반사의 방식에 의하여 이루어진다. 이는 구조 및 재료에 관한 문제이다. 일반적으로 도광판의 재료로 가장 많이 쓰는 아크릴을 재료로 쓸 경우 아크릴의 굴절률이 1.491이고 공기와의 계면에서의 전반사각이 42.12도 이다. 완전 전반사만을 통해서 빛의 방향을 제어하는 데 있어 빛의 진행방향에 대하여 유도홈을 설치할 수 있는 유도홈의 각도 대역은 90도-42.12도=47.88도로 상당히 넓은 범위를 가지고 있다. 이것은 유도홈 설계가 비교적 용이하며 전반사만을 통한 방향제어가 어려운 일이 아니므로 휘도의 저하 없이 도광판 일체형 LGB를 구현할 수 있다는 것을 의미한다.Changes in the course and direction of light in the interior of the present invention are all made by total reflection. This is a matter of structure and material. In general, when acrylic is used as the material of the light guide plate as the material, the refractive index of the acrylic is 1.491 and the total reflection angle at the interface with air is 42.12 degrees. In controlling the direction of light through total internal reflection only, the angular band of the guide groove in which the guide groove can be installed with respect to the direction of the light has a wide range of 90 degrees to 42.12 degrees = 47.88 degrees. This means that the design of the induction groove is relatively easy and the direction control through total reflection is not difficult, so that the LGB integrated LGB can be realized without deteriorating the luminance.

이에 반하여 종래의 LGB는 도 1의 6의 경우처럼 단 한 번만에 임계각 이하의 각으로 LGB의 패턴면에 입사하는 빛이 많다. 따라서 빛의 방향을 제어하는 반사과정에서 휘도의 많은 저하가 존재할 수 밖에 없다. 또 종래의 LGB는 도광판에 입사하기 전에 공기층을 한번 통과한다. 일반적으로 빛은 굴절률의 차이가 큰 층을 통과하면서 많은 양이 흡수된다. 실례로 쏘니사의 2.04인치 LCD도광판용 LGB는 입사한 광속중 겨우 60% 정도만이 도광판으로 입사한다.In contrast, the conventional LGB has a lot of light incident on the pattern surface of the LGB at an angle of less than the critical angle only once, as in the case of 6 of FIG. Therefore, there is a lot of deterioration in luminance in the reflection process that controls the direction of light. In addition, the conventional LGB passes through the air layer once before entering the light guide plate. In general, a large amount of light is absorbed while passing through a layer having a large difference in refractive index. Sony's LGB for 2.04-inch LCD LGP, for example, enters the LGP only 60% of the luminous flux.

본 발명품은 휘도의 저하 없이 점 광원을 선광원으로 바꿀 수 있다. 또 본 발명품은 종래의 LGB에 비하여 부품의 수를 대폭 줄일 수 있다. 참고로 기존의 LGB는 아크릴 막대와 LED 그리고 막대를 감싸는 반사판으로 구성되어있다.The present invention can change the point light source into a linear light source without lowering the luminance. In addition, the present invention can significantly reduce the number of parts compared to the conventional LGB. For reference, the existing LGB consists of an acrylic bar, an LED, and a reflector that surrounds the bar.

Claims (1)

LED형 도광판의 입광부에 일정한 형상의 홈을 설치하여 빛의 방향을 유도하도록 한 도광판Light guide plate to guide the direction of light by installing a groove of a certain shape in the light-receiving part of the LED light guide plate
KR1020020050873A 2002-08-27 2002-08-27 Unified light guide bar KR20040019202A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100895178B1 (en) * 2007-05-10 2009-05-04 삼성전자주식회사 Key pad assembly
US7695178B2 (en) 2005-06-23 2010-04-13 Samsung Electronics Co., Ltd Light-guide plate, backlight assembly and liquid crystal display having the same

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JPH06281929A (en) * 1993-03-29 1994-10-07 Sanyo Electric Co Ltd Surface illuminator
JPH11143377A (en) * 1997-11-07 1999-05-28 Citizen Electronics Co Ltd Face-like light source unit
JPH11353917A (en) * 1998-06-05 1999-12-24 Citizen Electronics Co Ltd Surface light source unit
JP2000149635A (en) * 1998-11-09 2000-05-30 Matsushita Electric Ind Co Ltd Surface lighting system and display device using same
JP2001110224A (en) * 1999-10-06 2001-04-20 Nidec Copal Corp Planar emitter
JP2001143518A (en) * 1999-09-03 2001-05-25 Hitachi Chem Co Ltd Panel light source device
JP2001166151A (en) * 1999-12-13 2001-06-22 Rohm Co Ltd Light guide plate, illumination device and liquid crystal display device having the illumination device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06281929A (en) * 1993-03-29 1994-10-07 Sanyo Electric Co Ltd Surface illuminator
JPH11143377A (en) * 1997-11-07 1999-05-28 Citizen Electronics Co Ltd Face-like light source unit
JPH11353917A (en) * 1998-06-05 1999-12-24 Citizen Electronics Co Ltd Surface light source unit
JP2000149635A (en) * 1998-11-09 2000-05-30 Matsushita Electric Ind Co Ltd Surface lighting system and display device using same
JP2001143518A (en) * 1999-09-03 2001-05-25 Hitachi Chem Co Ltd Panel light source device
JP2001110224A (en) * 1999-10-06 2001-04-20 Nidec Copal Corp Planar emitter
JP2001166151A (en) * 1999-12-13 2001-06-22 Rohm Co Ltd Light guide plate, illumination device and liquid crystal display device having the illumination device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7695178B2 (en) 2005-06-23 2010-04-13 Samsung Electronics Co., Ltd Light-guide plate, backlight assembly and liquid crystal display having the same
KR100895178B1 (en) * 2007-05-10 2009-05-04 삼성전자주식회사 Key pad assembly

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