KR100270970B1 - Back light - Google Patents

Back light Download PDF

Info

Publication number
KR100270970B1
KR100270970B1 KR1019980014820A KR19980014820A KR100270970B1 KR 100270970 B1 KR100270970 B1 KR 100270970B1 KR 1019980014820 A KR1019980014820 A KR 1019980014820A KR 19980014820 A KR19980014820 A KR 19980014820A KR 100270970 B1 KR100270970 B1 KR 100270970B1
Authority
KR
South Korea
Prior art keywords
guide plate
light
light guide
display device
light source
Prior art date
Application number
KR1019980014820A
Other languages
Korean (ko)
Other versions
KR19990081092A (en
Inventor
손대원
Original Assignee
박낙진
동화프라임주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 박낙진, 동화프라임주식회사 filed Critical 박낙진
Priority to KR1019980014820A priority Critical patent/KR100270970B1/en
Priority to JP10181438A priority patent/JPH11305229A/en
Publication of KR19990081092A publication Critical patent/KR19990081092A/en
Application granted granted Critical
Publication of KR100270970B1 publication Critical patent/KR100270970B1/en

Links

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
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE: A backlight is provided to obtain a superior quality of an image having an uniform illumination by uniformly reflecting a light source transferred to a light guiding plate. CONSTITUTION: A backlight comprises a light guiding plate(10). An LCD displaying device(30) is fixed on a front portion of the light guiding plate(10). The light guiding plate(10) is manufactured by a flat plate having a thin thickness. A lower side(11) of the light guiding plate(10) has a flat shape and an upper side(12) thereof is tapered from both ends thereof to an inner center portion thereof. A reflecting portion(16) is formed at a slope portion of the light guiding plate(10). A light source of a light emitting member(40) is transferred to one side of the light guiding plate(10). The light source of the light emitting member(40) is refracted to a rear side of the LCD displaying section(30).

Description

백라이트Backlight

본 발명은 각종 전기기기류의 LCD디스플레이장치 배면으로 광원을 비추어주어 표시부에 표시되는 숫자나 문자 등이 선명하게 표출시키도록 백라이트에 관한 것으로, 특히 디스플레이되는 표시장치의 밝기가 균일하고 낮은 소비전력으로 고휘도를 얻을 수 있게 한 것이다.The present invention relates to a backlight to display the light source to the back of the LCD display device of a variety of electrical devices to display the numbers or letters displayed on the display clearly, in particular, the brightness of the displayed display device is uniform, low power consumption, high brightness To get it.

각종 전기기기에 의해 표시되는 문자나 숫자 또는 문양 등은 어두운 곳에서 이를 밝게 비추어주어 이용자가 표시장치를 바라보는데 어려움이 없도록 하는데 많은 노력을 아끼지 아나하고 있다.Letters, numbers, or patterns displayed by various electrical devices are brightly lit in a dark place so that the user does not have difficulty in viewing the display device.

일 예로서 주유기에 의해 주유되는 유량을 표시하는 유량계의 디스플레이장치는 숫자나 문자 등을 표시하는 표시장치와 함께 상기 표시장치에 의해 표시되는 내용을 어두운 상태에서도 쉽게 알아 볼 수 있도록 표시장치의 배면부를 밝게 비추는 백라이트를 설치하고, 상기 백라이트에는 광원으로부터 전달되는 빛의 고른 분산을 도모하기 위해 도광판을 설치하고 있다.As an example, the display device of the flow meter for displaying the flow rate to be supplied by the lubricator, along with a display device for displaying numbers or letters, the back portion of the display device so that the contents displayed by the display device can be easily seen even in a dark state A brightly lit backlight is provided, and a light guide plate is provided in the backlight to evenly distribute light transmitted from the light source.

상기 백라이트는 표시장치의 배면광으로 이용되는 것으로, LCD의 표시 성능이나 전기적, 기구적 성능에 중요한 영향을 주는 것이므로 LCD의 성능과 용도에 따라 그 디자인이 고려되어야 하고, 밧데리의 전원을 이용하는 전기기기의 경우 박형, 경량화, 저소비전력화, 고휘도화가 요구되고 있다.The backlight is used as a backlight of the display device, and since the backlight has an important influence on the display performance, the electrical and mechanical performance of the LCD, the design of the backlight should be considered according to the performance and the use of the LCD, and an electric device using a battery power source. In the case of thin, light weight, low power consumption, high brightness is required.

종래의 백라이트는 도광판의 일측에 램프를 설치하여 상기 도광판의 측면으로 투사되는 램프의 빛을 그 상부측 또는 그 전면부에 설치되는 액정셀로 반사시키도록 구성되고 있다.The conventional backlight is configured to reflect a light of a lamp projected to a side of the light guide plate to a liquid crystal cell installed at an upper side or a front side thereof by installing a lamp on one side of the light guide plate.

하지만 종래에는 상기 도광판이 평면으로 형성되어 있었기 때문에 도광판의 양쪽 광원부 즉, 램프와 인접되는 부위와 램프의 광원이 전달되는 중앙부의 광원이 서로 다르게 분포되는 결점이 있고, 별도의 확산시트를 이용하게 되는 경우 휘도가 반감되는 결점이 있다.However, in the related art, since the light guide plate is formed in a plane, there is a disadvantage in that both light source parts of the light guide plate, that is, a portion adjacent to the lamp and a light source in the center portion where the light source of the lamp is transmitted are differently distributed, and use a separate diffusion sheet. In this case, there is a drawback that the luminance is halved.

또한, 휘도 증대를 위해서 램프의 소비전력을 2배이상으로 증대시킬 경우 휘도는 증대되는 반면에 램프의 수명은 크게 단축되는 등의 문제점이 있었다.In addition, when the power consumption of the lamp is increased more than twice to increase the brightness, the brightness is increased while the life of the lamp is greatly shortened.

본 발명은 상기와 같은 종래의 문제점을 감안하여 안출한 것으로, 램프와 같은 발광부재로부터의 투사되는 광원을 확산시키도록 된 도광판의 구조 개선을 통해 도광판에 전달되는 광원의 균일한 밝기로 반사시겨 균일한 조도에 의한 양질의 화상을 얻을 수 있도록 하는 백라이트를 제공함에 그 목적이 있는 것인 바, 이를 첨부한 예시 도면을 참고하여 그 구성 및 작용 효과를 설명하면 다음과 같다.The present invention has been made in view of the above-described conventional problems, and is uniformly reflected by the uniform brightness of the light source transmitted to the light guide plate through improvement of the structure of the light guide plate to diffuse the light source projected from the light emitting member such as a lamp. The purpose of the present invention is to provide a backlight for obtaining a high quality image by one illuminance. Referring to the accompanying drawings, the configuration and operation effects will be described below.

도1은 본 발명이 적용된 백라이드의 분해 사시도,1 is an exploded perspective view of a backlight to which the present invention is applied;

도2는 본1의 조립 단면도,2 is an assembly cross-sectional view of the present 1;

도3은 본 발명에 따른 백라이드의 다른 예시도,Figure 3 is another illustration of a back light according to the present invention,

＜도면의 주요 부분에 대한 부호의 설명＞<Description of the code | symbol about the principal part of drawing>

10,50: 도광판 16,54: 반사부10, 50: light guide plate 16, 54: reflector

18: 요함부 20: 케이스18: essential part 20: case

22: 수납공간 30: LCD표시장치22: storage space 30: LCD display device

40: 발광부재40: light emitting member

도1에 나타낸 바와 같이 본 발명은 빛이 투과할 수 없는 불투명체로 되는 케이스(20)에 취부되는 도광판(10)을 이용하여 그 전면에 고정되는 LCD표시장치(30)의 배면에 발광부재(40)의 광원을 비추도록 된 것에 있어서, 상기 도광판(10)은 두께가 얇은 투명한 평판으로 되고, 상기 도광판(10)의 저면(11)은 무모양이고 그 상면(12)은 양쪽 끝단으로부터 내측 중앙부쪽으로 완만하게 테이퍼지게 형성하여 상기 경사면에는 램프와 같은 발광부재(40)의 광원을 굴절시키기 위해 미세하게 엠보싱되는 반사부(16)를 형성하여 상기 도광판(10)의 일측면으로 전달되는 발광부재(40)의 광원이 상기 반사부(16)에 의해 LCD표시장치(30)의 배면쪽으로 굴절되는 구성으로 됨을 특징으로 하고 있다.As shown in FIG. 1, the present invention utilizes a light guide plate 10 mounted on a case 20 that is an opaque material through which light cannot pass, and thus the light emitting member 40 is disposed on a rear surface of the LCD display device 30 fixed to the front surface thereof. In order to shine a light source of the light guide plate 10, the light guide plate 10 is a thin thin transparent plate, the bottom surface 11 of the light guide plate 10 is unshape, and the upper surface 12 from both ends toward the inner central portion The taper is gently tapered to form a reflective part 16 which is finely embossed to deflect a light source of the light emitting member 40 such as a lamp, and is then transmitted to one side of the light guide plate 10. ), The light source is refracted by the reflector 16 toward the rear surface of the LCD display device 30.

본 발명에서는 도광판(10)에 광원을 발생하는 발광부재(40)와 상기 발광부재(40)가 삽입되는 도광판(10)의 요함부(18)가 서로 마주 향하도록 4개씩 설치되는 것을 일 예시도로 도시하였으나, 상기 요함부(18,18,…)와 발광부재(40,40,…)는 도광판(10) 또는 LCD표시장치(30)의 크기 변화에 따라 각각 증,감되어질 수 있는 것이다.In the present invention, the light emitting member 40 for generating a light source on the light guide plate 10 and the four recesses 18 of the light guide plate 10 into which the light emitting member 40 is inserted are provided so as to face each other. Although illustrated, the recesses 18, 18,... And the light emitting members 40, 40,... May be increased or decreased according to the size change of the light guide plate 10 or the LCD display device 30.

또한, 도광판(10)의 상면(12)으로 조립되는 LCD표시장치(30)는 도광판(10)으로부터 전달되는 발광부재(40)의 광원이 그 배면을 통해 전면으로 투과되어질 수 있도록 투명 또는 반투명체로 형성되고 있다.In addition, the LCD display device 30 assembled to the upper surface 12 of the light guide plate 10 may be a transparent or semi-transparent body so that the light source of the light emitting member 40 transmitted from the light guide plate 10 can be transmitted to the front surface through the rear surface thereof. It is being formed.

도3은 본 발명의 다른 실시 예를 나타낸 것으로, 비교적 작은 용량 즉, 크기가 작은 경우에는 도광판(50)의 중심 상면이 상부측으로 융기 돌출되는 곡면으로 형성하여 상기 곡면부(52)에 길이가 짧은방향(가로방향)으로 산형요철부로 되는 반사부(54)를 형성하여 상기 반사부(54)에 의해 굴절된 발광부재(40)의 광원이 LCD표시장치(30)의 배면을 비추도록 구성할 수 있는 것이다.3 illustrates another embodiment of the present invention. In the case of a relatively small capacity, that is, a small size, the upper surface of the center of the light guide plate 50 is formed as a curved surface protruding upward, and thus the length of the curved portion 52 is short. The light source of the light emitting member 40 refracted by the reflector 54 may be formed to reflect the back surface of the LCD display device 30 by forming a reflector 54 that is a recessed and projected portion in a direction (horizontal direction). It is.

이와 같이 구성된 본 발명은 케이스(20)의 내측 수납공간(22)으로 도광판(10)과 함께 도광판(10)의 요함부(18,18,…)에 광원을 비추도록 된 발광부재(40,40,…)를 고정 배치한 다음 상기 도광판(10)의 상면(12)에 LCD표시장치(30)를 고정한다.According to the present invention configured as described above, the light emitting members 40 and 40 are configured to shine a light source into recesses 18, 18,... Of the light guide plate 10 together with the light guide plate 10 to the inner storage space 22 of the case 20. ,..., And fixing the LCD display device 30 on the upper surface 12 of the light guide plate 10.

상기와 같이 조립 구성된 본 발명은 발광부재(40,40,…)에 전원을 인가하여 발광부재(40)를 점등시키게 되면, 이로부터 발생된 광원은 도광판(10)의 측면으로 투사되고, 도광판(10)으로 투사된 빛은 도광판(10)이 투명체로 형성되어 있으므로 이의 끝단까지 투사되게 된다.When the light emitting member 40 is turned on by applying power to the light emitting members 40, 40,..., The light source generated therefrom is projected to the side of the light guide plate 10, and the light guide plate ( The light projected by 10) is projected to the end of the light guide plate 10 because it is formed of a transparent body.

이처럼 도광판(10)으로 투과되는 빛이 경사면에 이르면 더 이상 직직하지 못하고 미세하게 엠보싱된 반사부(16)에 의해 광원은 굴절되게 된다. 이때 광원은 도광판(10)의 상면(12)을 제외한 나머지부분은 불투명체로 되는 케이스(20)에 차폐되어 있어 모든 광원은 LCD표시장치(30)의 배면으로 투사되어지며 확산되고, LCD표시장치(30)의 배면으로 투사되는 광원은 LCD표시장치(30)의 배면을 통해 전면으로 표출되게 된다.As such, when the light transmitted to the light guide plate 10 reaches the inclined surface, the light source is refracted by the reflector 16 which is no longer vertical but finely embossed. At this time, the light source is shielded on the case 20 except the upper surface 12 of the light guide plate 10 to be an opaque body, so that all the light sources are projected to the rear surface of the LCD display device 30 and diffused, and the LCD display device ( The light source projected to the rear surface of 30 is exposed to the front surface through the rear surface of the LCD display device 30.

도광판(10)에 의해 굴절되어 LCD표시장치(30)의 전면으로 투사되는 광원에 의해 LCD표시장치(30)는 보다 선명한 화면과 함께 LCD표시장치(30)에 의해 표시되는 문자나 숫자 등은 보다 선명하게 나타내 보이게 된다.By the light source refracted by the light guide plate 10 and projected to the front of the LCD display device 30, the LCD display device 30 displays a clearer screen and displays letters and numbers displayed by the LCD display device 30. It will appear clearly.

이때, 도광판(2)의 양방에 설치되는 발광부재의 수를 증대시키면 보다 선명한 화면을 구성할 수 있는 것이다.At this time, if the number of light emitting members provided on both of the light guide plate 2 is increased, a clearer screen can be configured.

이처럼 본 발명의 백라이트는 LCD에 의해 디스플레이되는 문자나 숫자 및 문양 등을 표시토록하는 표시장치의 배면부를 도광판에 의해 반사되는 광원을 이용하여 밝게 비추어주므로써 야간에도 표시장치를 밝고 선명하게 비추어줄 수 있는 것으로, 이러한 구성은 LCD표시장치를 이용하는 페이저, 주유기의 유량표시장치, 각종 전기기기류의 표시장치 등에 아주 유용하게 이용되어질 수 있는 것이다.As described above, the backlight of the present invention can brightly and brightly display the display device even at night by illuminating the back portion of the display device for displaying letters, numbers, and patterns displayed by the LCD using a light source reflected by the light guide plate. In this way, such a configuration can be very usefully used for a pager using an LCD display device, a flow rate display device for an lubricator, and a display device for various electric devices.

이상과 같은 본 발명은 빛의 누설이 없도록 도광판(2)이 케이스의 내측에 수납시키고 그 상부측에 LCD표시장치를 설치하여 발광부재의 광원으로부터의 전달되는 모든 빛을 도광판을 이용하여 LCD표시장치의 배면으로 고르게 반사시킴으로써 양질의 화상을 얻을 수 있는 이점이 있다.In the present invention as described above, the light guide plate 2 is housed inside the case so that there is no leakage of light, and an LCD display device is installed on the upper side thereof, so that all the light transmitted from the light source of the light emitting member is transferred to the LCD display device. There is an advantage that a good image can be obtained by evenly reflecting to the back side of.

또 도광판에 의해 LCD표시장치의 배면으로 확산되는 광원의 휘도는 도광판의 양쪽을 내측 중앙으로 경사지게 형성하고 있어 종래에 비하여 2배이상으로 향상되기 때문에 기존의 특성을 유지하면서 소비전력을 절반으로 저감시킬 수 있을 뿐만 아니라, 휘도 효율 또한 종래에 비하여 2배이상으로 향상시킬 수 있게 되는 등의 특징을 지닌 것이다.In addition, since the brightness of the light source diffused by the light guide plate to the back of the LCD display device is inclined toward the inner center of the light guide plate, the brightness of the light source is increased by more than twice as compared with the conventional one, so that power consumption can be reduced by half while maintaining the existing characteristics. Not only that, but also the luminance efficiency can be improved by more than two times as compared to the prior art.

Claims (3)

도광판(10)을 이용하여 그 전면에 고정되는 LCD표시장치(30)의 배면에 발광부재(40)의 광원을 비추도록 된 백라이트에 있어서, 상기 도광판(10)은 두께가 얇은 투명한 평판으로 되고, 상기 도광판(10)의 저면(11)은 무모양이고 그 상면(12)은 양쪽 끝단으로부터 내측 중앙부쪽으로 완만하게 테이퍼지게 형성하여 상기 경사면에는 미세하게 엠보싱되는 반사부(16)를 설치하고, 상기 도광판(10)의 일측면으로 전달되는 발광부재(40)의 광원이 상기 반사부(16)에 의해 LCD표시장치(30)의 배면쪽으로 굴절되는 구성으로 됨을 특징으로 하는 백라이트.In the backlight for illuminating the light source of the light emitting member 40 on the rear surface of the LCD display device 30 fixed to the front surface using the light guide plate 10, the light guide plate 10 is a thin transparent plate, The bottom surface 11 of the light guide plate 10 is a shape, and the top surface 12 is formed to be tapered gently from both ends toward the inner center portion, and the reflecting portion 16 is finely embossed on the inclined surface, and the light guide plate is provided. Backlight, characterized in that the light source of the light emitting member 40 is transmitted to one side of the (10) is refracted by the reflecting portion 16 toward the back of the LCD display device (30). 제1항에 있어서, 상기 도광판(10)에 광원을 부여하는 발광부재(40)와 상기 발광부재(40)가 조립되는 요함부(18)는 도광판(10) 또는 LCD표시장치(30)의 크기 변화에 따라 증,감되는 것을 특징으로 하는 백라이트.According to claim 1, wherein the light emitting member 40 for providing a light source to the light guide plate 10 and the recess 18 to which the light emitting member 40 is assembled is the size of the light guide plate 10 or the LCD display device 30. Backlight, characterized in that the increase and decrease as the change. 제1항에 있어서, 상기 도광판은 중심 상면이 상부측으로 융기 돌출되는 곡면으로 되고, 상기 곡면부(52)에는 길이가 짧은방향(가로방향)으로 산형요철부로 되는 반사부(54)를 형성하여 상기 반사부(54)에 의해 광원이 굴절되어 LCD표시장치(30)의 배면을 비추도록 됨을 특징으로 하는 백라이트.2. The light guide plate of claim 1, wherein the light guide plate is a curved surface in which the upper surface of the center is protruded upward, and the curved portion 52 is formed with a reflecting portion 54 that is a ridged uneven portion in a short direction (horizontal direction). The backlight is characterized in that the light source is refracted by the reflector 54 to illuminate the back of the LCD display device (30).
KR1019980014820A 1998-04-25 1998-04-25 Back light KR100270970B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1019980014820A KR100270970B1 (en) 1998-04-25 1998-04-25 Back light
JP10181438A JPH11305229A (en) 1998-04-25 1998-06-12 Back light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019980014820A KR100270970B1 (en) 1998-04-25 1998-04-25 Back light

Publications (2)

Publication Number Publication Date
KR19990081092A KR19990081092A (en) 1999-11-15
KR100270970B1 true KR100270970B1 (en) 2000-11-01

Family

ID=19536697

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019980014820A KR100270970B1 (en) 1998-04-25 1998-04-25 Back light

Country Status (2)

Country Link
JP (1) JPH11305229A (en)
KR (1) KR100270970B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100970268B1 (en) * 2003-10-11 2010-07-16 삼성전자주식회사 Backlihgt assembly and display apparatus having the same
KR100903159B1 (en) 2006-07-04 2009-06-17 노키아 코포레이션 A display and a method of providing a display
KR100877377B1 (en) * 2007-04-13 2009-01-09 박영석 Door Scuff

Also Published As

Publication number Publication date
JPH11305229A (en) 1999-11-05
KR19990081092A (en) 1999-11-15

Similar Documents

Publication Publication Date Title
US4915478A (en) Low power liquid crystal display backlight
US4909604A (en) Light source device
KR19990037080A (en) Metering type surface light source device
KR20070077844A (en) Backlight assembly and liquid crystal display apparatus having the same
US20020036900A1 (en) Spread illumination apparatus
WO2019157847A1 (en) Total reflection display device and plastic frame assembly
KR100270970B1 (en) Back light
GB2270409A (en) Light wedge for distributing light across a display device
JP4485026B2 (en) Light guiding unit
TWI286614B (en) A set of optical prisms and associated application for a light-emitting apparatus
JPH07287228A (en) Backlight
KR100595934B1 (en) Back light unit
US20080144335A1 (en) Light guide plate and backlight module including the same
JP2573282B2 (en) Lighting device for liquid crystal display
JPH05107542A (en) Backlight unit for display device
JPH08240721A (en) Liquid crystal back light capable of adjusting illuminating luminance
JP4673476B2 (en) Surface light source device
JP3040473U (en) Luminous indicator
US7594744B2 (en) Backlight module
KR20070101483A (en) Back light assembly
CN217482579U (en) Eye-protecting lamp
CN100419537C (en) Illuminating device
JP2014002995A (en) Led surface light-emitting device
JPH0533131U (en) Surface light source
JPH0588166A (en) Backlight unit for display device

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20070629

Year of fee payment: 8

LAPS Lapse due to unpaid annual fee