KR20020041479A - Back-light source module of liquid crystal display - Google Patents

Back-light source module of liquid crystal display Download PDF

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Publication number
KR20020041479A
KR20020041479A KR1020000071097A KR20000071097A KR20020041479A KR 20020041479 A KR20020041479 A KR 20020041479A KR 1020000071097 A KR1020000071097 A KR 1020000071097A KR 20000071097 A KR20000071097 A KR 20000071097A KR 20020041479 A KR20020041479 A KR 20020041479A
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KR
South Korea
Prior art keywords
light
guide plate
light source
light guide
led
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KR1020000071097A
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Korean (ko)
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유순재
Original Assignee
유순재
이갑식
미래마이크로닉스 주식회사
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Priority to KR1020000071097A priority Critical patent/KR20020041479A/en
Publication of KR20020041479A publication Critical patent/KR20020041479A/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
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003—Lens or lenticular 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

PURPOSE: A light source module of a back light of an LCD is provided to fabricate a light source of a back light operated with low voltage by combining an LED and a light guide plate to eliminate necessity for expensive elements and extend the life time of a battery. CONSTITUTION: A light source module of a back light of an LCD includes an LED light source(10), a driving PCB(20), the first and second light guide plates(30,40), and a lens. The driving PCB drives the LED light source. The second light guide plate disperses light emitted from the LED light source to send the light to the first light guide plate located at the back side of the LCD. The light dispersed by the second light guide plate is inputted to the first light guide plate, being perpendicular to the first light guide plate, according to the lens.

Description

엘씨디의 백 라이트 광원 모듈{BACK-LIGHT SOURCE MODULE OF LIQUID CRYSTAL DISPLAY}BACK-LIGHT SOURCE MODULE OF LIQUID CRYSTAL DISPLAY}

본 발명은 백 라이트 광원에 관한 것으로서, 특히 LCD(Liquid Crystal Display)의 백 라이트 광원으로 사용되고 있는 CCFL(Cold Cathode Fluorescent Lamp) 등의 광원을 LED 및 도광판을 이용하여 제작한 광원으로 대치할 수 있도록 한 LCD의 백 라이트 광원 모듈에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight light source, and in particular, to replace a light source such as a Cold Cathode Fluorescent Lamp (CCFL), which is used as a backlight light source of a liquid crystal display (LCD), with a light source manufactured by using an LED and a light guide plate. It relates to a backlight light source module of the LCD.

정보 및 통신 산업의 발달에 따라 휴대용 정보처리기기 및 이동통신 단말기의 고성능화가 지속적으로 요구됨에 따라 시스템의 각종 부품의 고성능 및 고급화가 계속적으로 요구되고 있다. 노트북과 같은 중대형 단말기의 모니터는 일반적으로 LCD를 사용하고 있어 뒷면의 백색 백라이트의 광원을 필요로 한다. 이러한 백라이트 광원은 대부분 CCFL과 같은 플라즈마원리의 광원으로 백색을 구현하는데 이러한 광원은 1) 인간의 시감도 특성과 발광 스펙트럼의 차이로 인한 광의 손실, 2) 플라즈마 가스 압력의 변화에 따르는 짧은 수명을 가지며, 3) 프라즈마 방전에 필요한 수 백 V의 고전압의 동작전압, 4) 또 이러한 고전력의 발생에 필요한 인버터를 필요로 하게된다.As the information and communication industry develops, high performance of portable information processing devices and mobile communication terminals is continuously required, and high performance and high quality of various components of the system are continuously required. Monitors of medium and large terminals such as laptops generally use LCDs and require a white backlit light source. Most of these backlight sources have a white light source using a plasma principle such as CCFL. These light sources have a short lifetime due to 1) loss of light due to differences in human visibility and emission spectrum, and 2) changes in plasma gas pressure. 3) A high voltage operating voltage of several hundred volts necessary for plasma discharge, and 4) an inverter required for generating such high power.

또한, CCFL과 같은 플라즈마식 소형 광원 이외에 소형 표시판의 경우 LED 점광원 또는 저휘도의 EL(Electro-Luminescence) 소자를 이용하고 있다. 그러나, 노트북의 경우 배터리의 60-70%를 LCD 백 라이트가 사용하고 있어 LCD에서의 표시면 전체의 휘도 균일성과 저전력화의 개발이 시급하게 요구되고 있다.In addition to the plasma small light source such as CCFL, a small display panel uses an LED point light source or a low luminance EL (Electro-Luminescence) device. However, in the case of notebooks, 60-70% of the batteries are used by LCD backlights, and therefore, there is an urgent need to develop luminance uniformity and lower power of the entire display surface in LCDs.

한편, LED는 반도체 재료를 이용하는 발광소자로서 반도체의 특성인 장수명, 저전력, 소형, 낮은 동작전압, 높은 내구성을 가짐에 따라 각종 정보처리 및 통신기기의 부품으로의 이용이 늘어나고 있으나, 가격의 문제로 LCD등의 광원으로 채용이 되지 않고 있다. 그러나 최근의 백색 LED 기술 개발과 양산에 따른 가격의 하락으로 중대형 백라이트의 광원으로 이용될 것으로 기대되고 있다.On the other hand, LED is a light emitting device using semiconductor materials, and as it has characteristics of long life, low power, small size, low operating voltage and high durability of semiconductors, the use of various information processing and communication equipment parts is increasing, but due to the problem of price It is not adopted as light source such as LCD. However, it is expected to be used as a light source for medium and large-sized backlight due to the recent drop in price due to the development and mass production of white LED technology.

본 발명은 이러한 점을 감안한 것으로, LED와 도광판을 결합하여 저동작전압의 백 라이트 광원을 제작함으로써 인버터 등의 고가 부품을 불필요로 하며, 밧데리의 사용시간을 연장할 수 있도록 한 LCD의 백 라이트 광원 모듈을 제공함에 그 목적이 있다.In view of the above, the present invention combines an LED and a light guide plate to produce a backlight light source having a low operating voltage, thereby eliminating expensive components such as an inverter and extending a battery's use time. The purpose is to provide a module.

도 1은 본 발명에 따른 LCD의 백 라이트 광원 모듈의 구성도.1 is a block diagram of a backlight light source module of the LCD according to the present invention.

도 2는 도 1의 각부의 결합상태에 대한 개략적인 측단면도.Figure 2 is a schematic side cross-sectional view of the combined state of the parts of FIG.

도 3은 본 발명의 다른 실시 예의 구현을 위한 제2 광도광판의 구조를 나타낸 도면이다.3 is a view illustrating a structure of a second light guide plate for implementing another embodiment of the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

10 : LED 광원 20 : 구동 PCB10: LED light source 20: driving PCB

30,40 : 제1, 제2 광도광판 50 : 렌즈30,40: first and second light guide plate 50: lens

]]

상기 목적을 달성하기 위한 본 발명에 따른 LCD의 백 라이트 광원 모듈은, LED 광원과; 상기 LED광원을 구동하기 위한 구동 PCB와; 상기 LED 광원으로부터의 광을 분산시켜 LCD 후면에 위치한 제1 광도광판으로 입력시키기 위한 제2 광도광판과; 상기 제2 광도광판으로부터의 광이 수직으로 상기 제1 도광판에 입사되도록 하는 렌즈로 구성됨을 특징으로 한다.Back light source module of the LCD according to the present invention for achieving the above object, LED light source; A driving PCB for driving the LED light source; A second light guide plate for dispersing light from the LED light source and inputting the light to the first light guide plate located at the rear of the LCD; And a lens for allowing light from the second light guide plate to enter the first light guide plate vertically.

상기 제2 광도광판은 비투과성 코팅이 된 경사면을 갖는 것을 특징으로 한다.The second light guide plate has an inclined surface with a non-transparent coating.

또한, 상기 제2 광도광판은 양측면이 소정의 기울기를 가짐을 특징으로 한다.In addition, the second light guide plate is characterized in that both sides have a predetermined slope.

이하, 본 발명을 첨부도면을 참조로 하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 일 실시 예에 따른 LCD의 백 라이트 광원 모듈의 구성도를 도시한 것이다.1 is a block diagram of a backlight light source module of an LCD according to an embodiment of the present invention.

이에 도시한 바와 같이, LED 광원(10)과, 상기 LED광원(10)을 구동하기 위한 구동 PCB(20)와, 점광원인 상기 LED 광원(10)에서 발생된 광을 분산시켜 LCD 후면에 위치한 제1 광도광판(40)에 입력시키기 위한 제2 광도광판(30)과, 상기 제2 광도광판(30)에서 분산된 광이 수직으로 상기 제1 광도광판(40)에 입사되도록 하는 렌즈(50 : 도 2에 도시)로 구성된다.As shown in the drawing, the LED light source 10, the driving PCB 20 for driving the LED light source 10, and the light generated from the LED light source 10 that is a point light source is located on the rear of the LCD The second light guide plate 30 for inputting to the first light guide plate 40 and the lens 50 for allowing the light dispersed in the second light guide plate 30 to be incident on the first light guide plate 40 vertically. : Shown in FIG. 2).

상기 LED 광원(10)은 표면실장형 LED 또는 COB(Chip On Board)형으로서 고휘도 백색이며, 상기 제2 광도광판(30)은 비투과성 코팅이 된 경사면(31)을 갖는다.The LED light source 10 is a surface-mount LED or COB (Chip On Board) type, high brightness white, and the second light guide plate 30 has an inclined surface 31 is a non-transparent coating.

도 2는 도 1의 각부가 결합된 상태의 개략적인 측단면도 및 렌즈를 도시한 것이다.Figure 2 shows a schematic side cross-sectional view and the lens of the combined state of Figure 1 the state.

상기 구성의 본 발명의 일 실시 예에서 상기 LED 광원(10)이 구동 PCB(20)에 의해 구동되어 발광하게 되면 발광된 빛은 제2 광도광판(30)으로 입사되어 분산된다.In the exemplary embodiment of the present invention, when the LED light source 10 is driven by the driving PCB 20 to emit light, the emitted light is incident on the second light guide plate 30 and dispersed.

이때, 상기 제2 광도광판(30)의 경사면(31)은 비투과성 코팅이 되어 있어 제2 광도광판(30)에 입사된 빛은 경사면(31)에서 도 2의 화살표 방향으로 반사된다.At this time, the inclined surface 31 of the second light guide plate 30 is a non-transparent coating so that the light incident on the second light guide plate 30 is reflected in the direction of the arrow of FIG.

경사면(31)에서 반사된 빛은 렌즈(50)를 통해 제1 광도광판(40)에 수직으로 입사된다.Light reflected from the inclined surface 31 is incident to the first light guide plate 40 through the lens 50.

즉, 상기 제1 광도광판(40)에는 LED 광원(10)에서 발생된 빛이 제2 광도광판(30)에서 분산된 후, 렌즈(50)를 통해 수직으로 입사됨에 따라 제1 광도광판(40)이 LCD 등의 백라이트 기능을 갖게 된다.That is, after the light generated from the LED light source 10 is dispersed in the second light guide plate 30, the first light guide plate 40 is vertically incident through the lens 50, and thus the first light guide plate 40 is applied to the first light guide plate 40. ) Will have a backlight function such as LCD.

도 3은 본 발명의 다른 실시 예의 구현을 위한 제2 광도광판(30)의 구성도를 도시한 것으로, 제2 광도광판(30)의 양측면이 약 65°기울기(바닥면에 대해서는 25°)를 갖도록 형성한 것이다.3 is a block diagram of a second light guide plate 30 for implementing another embodiment of the present invention, wherein both sides of the second light guide plate 30 are inclined at about 65 ° (25 ° with respect to the bottom surface). It is formed to have.

이 경우 제2 광도광판(30)이 65°의 기울기를 가짐에 따라 상기 제2 광도광판(30)에 빛을 제공하는 LED 광원(10) 역시 65° 기울기를 갖고 상기 제2 광도광판(30)에 빛을 제공할 수 있도록 위치되어야 함은 물론이다.In this case, as the second light guide plate 30 has an inclination of 65 °, the LED light source 10 that provides light to the second light guide plate 30 also has a 65 ° inclination and the second light guide plate 30 is inclined. Of course, it should be positioned to provide light to the.

이와 같이 구성되는 실시 예에서는 상기 LED 광원(10)이 구동 PCB(20)에 의해 구동되어 발광하게 되면 발광된 빛은 제2 광도광판(30)으로 입사되어 분산된다.In the exemplary embodiment configured as described above, when the LED light source 10 is driven by the driving PCB 20 to emit light, the emitted light is incident on the second light guide plate 30 and dispersed.

이때, 상기 제2 광도광판(30)의 양측면이 약 65° 기울기를 가지므로 제2 광도광판(30)에 입사된 빛은 제2 광도광판(30) 내에서 일종의 난반사와 같이 산란되어 제2 광도광판(30) 내에 빛이 골고루 분포하게 된다.At this time, since both sides of the second light guide plate 30 have an inclination of about 65 °, the light incident on the second light guide plate 30 is scattered like a kind of diffuse reflection in the second light guide plate 30 and thus the second light. Light is evenly distributed in the light guide plate 30.

상기 제2 광도광판(30)은 상기 실시 예와 같이 비투과성 코팅이 된 경사면(31)을 가지므로 제2 광도광판(30)의 빛은 경사면(31)에서 반사되어 렌즈(50)를 통해 수직으로 제1 광도광판(40)에 입사되게 된다.Since the second light guide plate 30 has an inclined surface 31 coated with a non-transmissive coating as in the above embodiment, the light of the second light guide plate 30 is reflected from the inclined surface 31 to be perpendicular through the lens 50. Incident to the first light guide plate 40.

이 경우 상기 실시예에 비해 제1 광도광판(40)에 보다 더 빛이 골고루 입사될 수 있게 된다.In this case, more light can be incident evenly on the first light guide plate 40 than in the above embodiment.

이상에서 살펴본 바와 같이, 본 발명은 중대형의 각종 휴대용 기기의 광원으로 사용되는 CCFL 등의 광원을 LED 및 도광판을 이용하여 제작한 광원으로 대치하여 LCD의 박형 및 경량, 고균일성, 고휘도 특성을 유지하면서도 저소비, 저전력화, 장 수명화의 특성 가지게 할 수 있어 시스템의 고성능화를 실현 할 수 있게 된다.As described above, the present invention is to replace the light source, such as CCFL used as a light source of various medium and large portable devices with a light source produced using the LED and the light guide plate to maintain the thin and lightweight, high uniformity, high brightness characteristics of the LCD At the same time, it is possible to realize the characteristics of low consumption, low power, and long life, thereby realizing high performance of the system.

Claims (4)

LED 광원과;An LED light source; 상기 LED광원을 구동하기 위한 구동 PCB와;A driving PCB for driving the LED light source; 상기 LED 광원으로부터의 광을 분산시켜 LCD 후면에 위치한 제1 광도광판으로 입력시키기 위한 제2 광도광판과;A second light guide plate for dispersing light from the LED light source and inputting the light to the first light guide plate located at the rear of the LCD; 상기 제2 광도광판에서 분산된 광이 수직으로 상기 제1 도광판에 입사되도록 하는 렌즈로 구성됨을 특징으로 하는 LCD의 백 라이트 광원 모듈.And a lens configured to allow light dispersed in the second light guide plate to enter the first light guide plate vertically. 제 1 항에 있어서,The method of claim 1, 상기 LED 광원은 표면실장형 LED 또는 COB(Chip On Board)형으로서 고휘도 백색인 것을 특징으로 하는 LCD의 백 라이트 광원 모듈.The LED light source is a surface-mount LED or COB (Chip On Board) type LCD backlight light source module, characterized in that the high brightness white. 제 1 항에 있어서,The method of claim 1, 상기 제2 광도광판은 비투과성 코팅이 된 경사면을 갖는 것을 특징으로 하는 LCD의 백 라이트 광원 모듈.The second light guide plate has a back light source module of the LCD, characterized in that having a non-transparent coating inclined surface. 제 1 항에 있어서,The method of claim 1, 상기 제2 광도광판은 양측면이 소정의 기울기를 가짐을 특징으로 하는 LCD의 백 라이트 광원 모듈.The second light guide plate has a predetermined slope of both sides of the LCD light source module of the LCD.
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100546705B1 (en) * 2002-09-25 2006-01-26 엘지.필립스 엘시디 주식회사 Backlight Unit for Liquid Crystal Display Device
KR100660047B1 (en) * 2005-12-01 2006-12-20 제일모직주식회사 Light guide panel for tft-lcd back light unit, tft-lcd back light unit and tft-lcd device thereby
US7275850B2 (en) 2004-01-24 2007-10-02 Samsung Electronics Co., Ltd. Backlight unit
US7293907B2 (en) 2004-06-29 2007-11-13 Samsung Electronics Co., Ltd. Backlight for display device, light source for display device, and light emitting diode used therefor
KR100784023B1 (en) * 2006-03-20 2007-12-07 엘지이노텍 주식회사 Backlight unit and LCD having the same
KR100789138B1 (en) * 2001-09-05 2007-12-27 삼성전자주식회사 Illumination device and reflection type liquid crystal display device using the same
KR100817368B1 (en) * 2005-08-04 2008-03-27 비오이 하이디스 테크놀로지 주식회사 Backlight assembly of liquid crystal panel
US8072555B2 (en) 2006-12-19 2011-12-06 Fujitsu Limited Display device, display panel unit, and information processing apparatus
CN109765723A (en) * 2019-03-12 2019-05-17 京东方科技集团股份有限公司 A kind of light source assembly, side-edge type backlight mould group and display device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100789138B1 (en) * 2001-09-05 2007-12-27 삼성전자주식회사 Illumination device and reflection type liquid crystal display device using the same
KR100546705B1 (en) * 2002-09-25 2006-01-26 엘지.필립스 엘시디 주식회사 Backlight Unit for Liquid Crystal Display Device
US7275850B2 (en) 2004-01-24 2007-10-02 Samsung Electronics Co., Ltd. Backlight unit
US7293907B2 (en) 2004-06-29 2007-11-13 Samsung Electronics Co., Ltd. Backlight for display device, light source for display device, and light emitting diode used therefor
KR100817368B1 (en) * 2005-08-04 2008-03-27 비오이 하이디스 테크놀로지 주식회사 Backlight assembly of liquid crystal panel
KR100660047B1 (en) * 2005-12-01 2006-12-20 제일모직주식회사 Light guide panel for tft-lcd back light unit, tft-lcd back light unit and tft-lcd device thereby
KR100784023B1 (en) * 2006-03-20 2007-12-07 엘지이노텍 주식회사 Backlight unit and LCD having the same
US8072555B2 (en) 2006-12-19 2011-12-06 Fujitsu Limited Display device, display panel unit, and information processing apparatus
CN109765723A (en) * 2019-03-12 2019-05-17 京东方科技集团股份有限公司 A kind of light source assembly, side-edge type backlight mould group and display device

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