KR960000258B1 - Back light for liquid crystal display elements - Google Patents
Back light for liquid crystal display elements Download PDFInfo
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- KR960000258B1 KR960000258B1 KR1019920020947A KR920020947A KR960000258B1 KR 960000258 B1 KR960000258 B1 KR 960000258B1 KR 1019920020947 A KR1019920020947 A KR 1019920020947A KR 920020947 A KR920020947 A KR 920020947A KR 960000258 B1 KR960000258 B1 KR 960000258B1
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- light
- plate
- liquid crystal
- crystal display
- guide plate
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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
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
제1도는 종래의 액정표시 소자용 백라이트 장치 구성도.1 is a block diagram of a conventional backlight device for a liquid crystal display device.
제2도는 종래 액정표시 소자용 백라이트의 확산판 확산 상태도.2 is a diffusion plate diffusion state diagram of a backlight for a conventional liquid crystal display device.
제3도는 종래 액정표시 소자의 휘도 분포 곡선도.3 is a luminance distribution curve diagram of a conventional liquid crystal display device.
제4도는 본 발명의 프리즘판을 이용한 액정표시 소자용 백라이트 장치 구성도.4 is a block diagram of a backlight device for a liquid crystal display device using the prism plate of the present invention.
제5도는 제4도의 부분별 상세도.FIG. 5 is a detailed view of parts of FIG.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 광원 2 : 도광판1: light source 2: light guide plate
3, 6 : 반사판 4 : 확산판3, 6: reflector 4: diffuser
5 : 프리즘판5: prism plate
본 발명은 대혁 액정 표시소자용 백라이트 구조에 관한 것으로, 특히 광원으로 부터 액정 표시소자에 인가되는 빛의 휘도분포를 균일하게 하여 액정표시 소자의 성능향상에 적당하도록 한 액정표시 소자용 백라이트 장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight structure for a liquid crystal display device, and more particularly, to a backlight device for a liquid crystal display device in which a luminance distribution of light applied from a light source to a liquid crystal display device is uniform, so as to improve performance of the liquid crystal display device. will be.
일반적인 액정 표시소자는 액정을 벽면에 수직으로 배열해두고 전압을 인가하며 액정을 경사지게 하여 잭 라이트(Back Light : B/L)의 입사광 복굴적과 주사수에 따른 광로차에 의해서 투과 광량을 조절하여 데이타를 표현한다.A typical liquid crystal display device arranges liquid crystals vertically on a wall, applies a voltage, and inclines the liquid crystal to control the amount of transmitted light by the incident light birefringence of the back light (B / L) and the optical path difference depending on the number of scans. Express
제1도는 코울드 캐소드 프로레이트 라이트(Cold Cathod Flourate Light : 이하 CFL)인 종래의 백라이트 장치 구성도로서, 이에 도시된 바와같이 빛을 방출하는 광원 (1)의 빛을 인가받아 반사시키는 반사판(3) 위에 상기 광원(1)을 통한 빛을 90′회전시키며 진행시키는 도광판(2)이 형성되고, 그 도광판(2)위에 그 도광판(2)을 통한 빛과 상기 반사판(3)의 반사빛을 확산시키는 확산판(4)이 구비된 구조이다.FIG. 1 is a block diagram of a conventional backlight device which is a Cold Cathod Flourate Light (hereinafter referred to as CFL), and as shown therein, a reflecting plate 3 for receiving and reflecting light from a light source 1 emitting light. A light guide plate 2 is formed on the light guide plate 2 to rotate the light through the light source 1 by 90 ', and diffuses the light through the light guide plate 2 and the reflected light of the reflective plate 3 on the light guide plate 2. The diffusion plate 4 is provided.
상기와같이 구성된 액정 표시소자용 백라이트(B/L) 장치의 동작과정 및 문제점을 액정 표시소자의 휘도분포 곡선인 제 3 고와 확산판의 확산상태도인 제 2 도를 참조하여 설명하면 다음과 같다.The operation process and problems of the liquid crystal display backlight (B / L) device configured as described above will be described with reference to FIG. 3, which is a luminance distribution curve of the liquid crystal display, and FIG. 2, which is a diffusion state diagram of the diffusion plate. .
광원(1)에서 빛이 출력되어 특정방향(일예로 : A)으로 진행하여 도광판(2)에 도달하게 되면 이때 이 도광판(2)은 빛의 방향을 90°회전시키면 진행시킨다.When light is output from the light source 1 and proceeds in a specific direction (for example, A) to reach the light guide plate 2, the light guide plate 2 proceeds by rotating the light direction by 90 °.
상기의 과정을 통한 빛은 특정방향(일예로 : B)으로 진행하여 반사판(3)에 인가되는 한편 특정방향(일예로 : C)으로 진행하여 확산판(4)에 도달하며, 또한, 반사판(3)에 도달한 빛은 반사되어 확산판(4)에 인가되고 그 확산판(4)은 상기 반사판(3)을 통해 반사된 빛과 상기 도광판(2)을 통해 인가받은 빛을 제2도에 도시된 바와같이 여러방향으로 확산하여 서로다른 방향을 통해 액정표시 소자에 인가한다.The light through the above process is applied to the reflecting plate 3 in a specific direction (for example: B) while traveling in a specific direction (for example: C) to reach the diffuser plate 4, and furthermore, Light reaching 3) is reflected and applied to the diffuser plate 4, which diffuses the light reflected through the reflector 3 and the light applied through the light guide plate 2 to FIG. As shown in the drawing, the diffusion is applied to the liquid crystal display through different directions.
이때 액정표시 소장에 인가되는 빛의 휘도분포는 제3도에 도시된 바와같이 각 부분(X, Y, Z, W)에서의 분포(일예로 : X부분은 50mit(Cd/㎟), Y부분은 30mit(Cd/㎟), Z부분은(40mit/㎟), W부분은 45mit(Cd/㎟))가 서로다른 상태로 균일하지 못하게 된다.In this case, the luminance distribution of the light applied to the liquid crystal display is distributed in each of the portions (X, Y, Z, W) as shown in FIG. 3 (for example, the X portion is 50 mit (Cd / mm 2) and the Y portion). Silver 30mit (Cd / mm 2), Z portion (40mit / mm 2), and W portion 45mit (Cd / mm 2) are different from each other.
상기와 같이 동작하는 종래의 액정 표시소자용 백라이트 장치는 광원에서 방출된 빛이 도광판을 통해 회전하며 진행한 후 확산판을 통해 여러방향으로 확산되어 액정표시 소자에 인가되는 빛의 휘도분포가 균일하지 못하여 액정표시 소자의 성능을 저하시키는 문제점이 있었다.In the conventional backlight device for a liquid crystal display device operating as described above, the light emitted from the light source rotates through the light guide plate and then diffuses in various directions through the diffuser plate so that the luminance distribution of the light applied to the liquid crystal display device is not uniform. There was a problem in that the performance of the liquid crystal display device was deteriorated.
본 발명은 상기와 같은 종래의 문제점을 감안하여, 확산판 위에 프리즘판을 부착하여 도광판을 통해 회전된 빛의 방향에 관계없이 항상 일정방향으로 빛을 진행시킴으로써 액정 표시소자에 인가되는 빛의 휘도 분포를 균일하게 하여 액정 표시소자의 성능을 향상시키게 창안한 것으로, 이를 첨부한 도면을 참조하여 상세히 설명하면 다음과 같다.SUMMARY OF THE INVENTION In view of the above-described problems, the present invention attaches a prism plate on a diffuser plate and always propagates light in a predetermined direction irrespective of the direction of the light rotated through the light guide plate so that the luminance distribution of light applied to the liquid crystal display device is improved. Invented to improve the performance of the liquid crystal display device by uniformly, and will be described in detail with reference to the accompanying drawings.
제4도는 본 발명의 액정 표시소자용 백라이트 장치 구성도로서, 이에 도시한 바와같이 빛을 방출하는 광원(1)과, 그 광원(1)의 빛을 인가받아 90°회전시키는 도광판(2)과, 그 도광판(2)의 하부에 부착되어 도광판(2)을 통한 빛을 반사시키는 반사판(3)과, 상기 도광판(2)의 상부에 부착되어 그 도광판(2)을 통한 빛을 인가받아 확산시키는 확산판(4)과, 상기 확산판(4)위에 부착되어 그 확산판(4)을 통해 확산된 빛을 인가받아 균일방향으로 반사시키며 일정각(45°내외 범위)의 반사판(6)을 갖는 프리즘판(5)으로 구성한다.4 is a configuration diagram of a backlight device for a liquid crystal display device according to the present invention. As shown therein, a light source 1 emitting light, a light guide plate 2 rotating 90 ° upon receiving light from the light source 1, And a reflecting plate 3 attached to the lower portion of the light guide plate 2 to reflect light through the light guide plate 2, and attached to an upper portion of the light guide plate 2 to receive and diffuse light through the light guide plate 2. A diffuser plate 4 and a reflector plate 6 attached to the diffuser plate 4 to reflect light uniformly in a uniform direction by receiving light diffused through the diffuser plate 4. It consists of the prism board 5.
상기와 동일하게 구성한 본 발명 액정 표시소자용 백라이트 장치의 동작상태 및 작용효과를 본 발명의 부분별 확대도인 제 5 도를 참조하여 상세히 설명하면 다음과 같다.An operation state and an effect of the backlight device for a liquid crystal display device according to the present invention configured in the same manner as described above will be described in detail with reference to FIG.
광원(1)에서 방시된 빛이 특정방향(일예로 : A)으로 진행하여 도광판(2)에 도달하면, 그 도광판(2)은 인가된 빛의 방향을 90°회전시켜 특정방향(일예로 : B)으로 진행시켜 반사판(3)에 인가하는 한편, 특정방향(일예로 : C)으로 진행시켜 확산판(4)에 인가한다.When the light emitted from the light source 1 travels in a specific direction (for example, A) and reaches the light guide plate 2, the light guide plate 2 rotates the direction of the applied light by 90 ° to the specific direction (for example: It proceeds to B) and applies it to the reflecting plate 3, while advancing to a specific direction (e.g., C) and applying it to the diffusion plate 4.
이때 상기 반사판(3)은 도광판(2)을 통해 인가받은 빛을 반사시켜 확산판(4)에 인가하고, 이 확산판(4)은 상기 반사판(3)을 통해 반사된 빛과 상기 도광판(2)을 통해 직접인가 받은 빛을 서로 다른 여러방향으로 확산시켜 프리즘판(5)내의 반사판(6)에 인가한다.At this time, the reflecting plate 3 reflects the light applied through the light guide plate 2 to the diffuser plate 4, and the diffuser plate 4 reflects the light reflected through the reflecting plate 3 and the light guide plate 2. Diffuse light applied directly through) is applied to the reflecting plate 6 in the prism plate 5 in different directions.
여기서, 프리즘판(5)의 동작상태를 제5도를 참조하여 설명한다.Here, the operation state of the prism plate 5 will be described with reference to FIG.
상기의 과정을 통해 반사판(3)에서 반사되어 확산판(4)에서 제 5 도와 같이 서로다른 진행 방향으로 확산되어 인가되면 프리즘판(5)은 빛을 45°정도의 반사판(6)으로 반사시켜 일정방향(일예로 : D)으로 빛을 진행시켜 액정표시소자에 균일한 휘도 분포를 인가한다.When the light is reflected by the reflector 3 through the above process and diffused and applied in different propagation directions such as the fifth degree from the diffuser plate 4, the prism plate 5 reflects the light to the reflector plate 6 of about 45 °. The light is advanced in a predetermined direction (for example, D) to apply a uniform luminance distribution to the liquid crystal display.
상기와 같이 동작하는 본 발명의 액정표시 소자용 백라이트 장치는 도광판에서 회전되어 반사판에서 반사된후 확산판에서 여러 방향으로 확산된 빛을 인가받아 일정방향으로 진행시키므로 액정표시 소자에 균일한 휘도분포로 인가하여 액정표시 소자의 성능을 향상시키는 효과가 있다.The backlight device for the liquid crystal display device of the present invention operating as described above is rotated in the light guide plate and reflected from the reflecting plate, and then proceeds in a predetermined direction by receiving light diffused in various directions from the diffuser plate, thereby providing a uniform luminance distribution to the liquid crystal display device. There is an effect of improving the performance of the liquid crystal display element by applying.
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KR1019920020947A KR960000258B1 (en) | 1992-11-09 | 1992-11-09 | Back light for liquid crystal display elements |
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KR1019920020947A KR960000258B1 (en) | 1992-11-09 | 1992-11-09 | Back light for liquid crystal display elements |
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KR960000258B1 true KR960000258B1 (en) | 1996-01-04 |
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JP3520494B2 (en) * | 1998-05-11 | 2004-04-19 | 日東電工株式会社 | Reflective liquid crystal display |
KR20030080764A (en) * | 2002-04-10 | 2003-10-17 | 주식회사 윈스텍 | A Direct-lighting Backlight Unit |
KR100625437B1 (en) * | 2005-05-16 | 2006-09-15 | 엘지전자 주식회사 | Backlight unit and prism sheet employed in the same |
KR100823442B1 (en) * | 2006-02-21 | 2008-04-17 | 주식회사 엘지화학 | Anisotropy Diffusion Sheet |
KR101147095B1 (en) * | 2010-01-13 | 2012-05-17 | 황장환 | Composite Light Guide Plate, and Backlight Unit Using the Same |
KR101720341B1 (en) * | 2010-11-16 | 2017-03-27 | 엘지디스플레이 주식회사 | Backlight unit and liquid crystal display device using the same |
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