JPH07107567B2 - Surface lighting device - Google Patents
Surface lighting deviceInfo
- Publication number
- JPH07107567B2 JPH07107567B2 JP61177351A JP17735186A JPH07107567B2 JP H07107567 B2 JPH07107567 B2 JP H07107567B2 JP 61177351 A JP61177351 A JP 61177351A JP 17735186 A JP17735186 A JP 17735186A JP H07107567 B2 JPH07107567 B2 JP H07107567B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- critical angle
- light guide
- introducing surface
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- NCGICGYLBXGBGN-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine;hydrochloride Chemical compound Cl.[N-]1OC(=N)C=[N+]1N1CCOCC1 NCGICGYLBXGBGN-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000001795 light effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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
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)
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
Description
【発明の詳細な説明】 〔技術分野〕 この発明は、液晶表示体などの透過型表示体の背面光源
等に適用される面照明装置に関するものである。Description: TECHNICAL FIELD The present invention relates to a surface illumination device applied to a back light source of a transmissive display such as a liquid crystal display.
第６図および第７図に示すように、平板状であって一側
面を光導入面50とし表面の一方を前記光導入面50より入
射した入射光を前記表面の他方に反射する反射面51とし
前記表面の他方を透過発光面53とした所定の屈折率を有
する導光板54と、前記光導入面50に対向して前記光導入
面50の長手方向と平行な方向に軸方向を有する直管ラン
プ55とを備えた面照明装置がある。As shown in FIGS. 6 and 7, a reflecting surface 51 which is flat and has one side surface as a light introducing surface 50 and one of the surfaces which is incident from the light introducing surface 50 and which reflects the incident light to the other surface. And a light guide plate 54 having a predetermined refractive index with the other side of the surface being a transmissive light emitting surface 53, and a straight line having an axial direction facing the light introducing surface 50 and parallel to the longitudinal direction of the light introducing surface 50. There is a surface lighting device with a tube lamp 55.
この面照明装置は、導光板54の側部に直管蛍光ランプ55
を配置して導光板54の表面より発光させるいわゆるエッ
ジライトの構成である。This surface lighting device has a straight tube fluorescent lamp 55 on the side of the light guide plate 54.
Is arranged so that the surface of the light guide plate 54 emits light.
ところが、この面照明装置は、直管ランプ55の軸方向の
両端部の管端付近の輝度が低いため、導光板54の透過発
光面53の輝度が第７図の斜線で示す範囲の部分52におい
て暗くなるという欠点があった。However, in this surface lighting device, since the brightness near the tube ends at both ends in the axial direction of the straight tube lamp 55 is low, the brightness of the transmissive light emitting surface 53 of the light guide plate 54 is in the range 52 shown by the diagonal lines in FIG. There was a drawback that it became dark in.
これに対して、導光板54の光導入面50の長手方向の長さ
を直管ランプ55の有効発光長に等しくすると均一輝度を
得ることができるが、直管ランプ55の長さが導光板54の
長さより長くなるため装置が大型化するという欠点があ
る。On the other hand, if the length in the longitudinal direction of the light introduction surface 50 of the light guide plate 54 is made equal to the effective light emission length of the straight tube lamp 55, uniform brightness can be obtained. Since it is longer than 54, there is a drawback that the device becomes large.
また、第８図に示すように、導光板54の光導入面50の中
央部にしゃ光部や減光部56を設けて輝度を均一にするこ
とが提案されたが、高輝度部分の輝度がおさえられるた
め光効率が低下するという欠点がある。Further, as shown in FIG. 8, it has been proposed to provide a light-shielding portion or a light-reducing portion 56 in the central portion of the light-introducing surface 50 of the light guide plate 54 to make the luminance uniform. However, there is a drawback in that the light efficiency is reduced because the light is suppressed.
この発明の目的は、光効率を低下せずかつ大型化するこ
となく均一輝度を得ることができる面照明装置を提供す
ることである。An object of the present invention is to provide a surface lighting device that can obtain uniform brightness without lowering the light efficiency and without increasing the size.
この発明の面照明装置は、平板状であって一側面を光導
入面とし表面の少なくとも一方を透過発光面としかつ前
記透過発光面と反対側の表面を前記光導入面より入射し
た光を前記透過発光面に反射する反射面とした所定の屈
折率を有する導光板と、この導光板と異なる屈折率を有
し前記光導入面の厚さ方向に平行な板形状であって前記
光導入面の長手方向に複数個埋設状態に形成されるとと
もに前記光導入面の前記長手方向の中央部を境にそれぞ
れ内端部が前記光導入面の前記長手方向の両端に接近す
る方向に傾斜した臨界角反射部と、前記光導入面に対向
して前記光導入面の前記長手方向と平行な方向に軸方向
を有する直管ランプとを備えたものである。The surface lighting device of the present invention is a flat plate, one side surface of which is a light introducing surface and at least one of the surfaces is a transmissive emitting surface, and the surface opposite to the transmissive emitting surface is light incident from the light introducing surface. A light guide plate having a predetermined refractive index that is a reflection surface that reflects the transmissive light emitting surface, and a plate shape that has a refractive index different from that of the light guide plate and that is parallel to the thickness direction of the light introduction surface and that has the light introduction surface. A plurality of buried states are formed in the longitudinal direction of the light guide surface, and the inner ends of the light guide surface are inclined in a direction of approaching both ends of the light guide surface in the longitudinal direction with respect to the central portion of the light guide surface. It is provided with an angle reflecting portion and a straight tube lamp facing the light introducing surface and having an axial direction parallel to the longitudinal direction of the light introducing surface.
この発明の構成によれば、導光板の光導入面に臨界角反
射部を設けたため、光導入面の長手方向の中央部の入射
光を導光板の前記長手方向の両端部側に反射することが
できる。また臨界角反射部を臨界角反射しない光は臨界
角反射部を透過するため、光効率を低下しない。したが
って、装置を大型化することなくまた光効率を低下する
ことなく導光板の透過発光面の輝度を均一にすることが
できる。According to the configuration of the present invention, since the light guide surface of the light guide plate is provided with the critical angle reflecting portion, the incident light at the central portion in the longitudinal direction of the light guide surface can be reflected to both ends of the light guide plate in the longitudinal direction. You can Further, since light that does not reflect at the critical angle reflecting portion passes through the critical angle reflecting portion, the light efficiency does not decrease. Therefore, the brightness of the transmissive light emitting surface of the light guide plate can be made uniform without increasing the size of the device and reducing the light efficiency.
実施例 この発明の第１の実施例を第１図ないし第３図に基づい
て説明する。すなわち、この面照明装置は、平板状であ
って一側面を光導入面１とし表面の少なくとも一方を透
過発光面３としかつ前記透過発光面３と反対側の表面を
前記光導入面１より入射した光を前記透過発光面３に反
射する反射面２とした所定の屈折率を有する導光板４
と、この導光板４と異なる屈折率を有し前記光導入面１
の厚さ方向に平行な板形状であって前記光導入面１の長
手方向に複数個埋設状態に形成されることともに前記光
導入面１の前記長手方向の中央部を境にそれぞれ内端部
が前記光導入面１の前記長手方向の両端に接近する方向
に傾斜した臨界角反射部５と、前記光導入面１に対向し
て前記光導入面１の前記長手方向と平行な方向に軸方向
を有する直管ランプ６とを備えている。Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. That is, this surface illuminating device is flat and has one side surface as a light introducing surface 1 and at least one of the surfaces as a transmissive emitting surface 3, and a surface opposite to the transmissive emitting surface 3 is incident from the light introducing surface 1. A light guide plate 4 having a predetermined refractive index, which is a reflection surface 2 for reflecting the generated light to the transmission / emission surface 3
And the light introduction surface 1 having a refractive index different from that of the light guide plate 4.
A plate shape parallel to the thickness direction of the light introducing surface 1, and a plurality of light emitting surfaces 1 are embedded in the longitudinal direction of the light introducing surface 1, and the inner end portions of the light introducing surface 1 are separated from each other by the central portion in the longitudinal direction. Is a critical angle reflecting portion 5 inclined in a direction approaching both ends of the light introducing surface 1 in the longitudinal direction, and an axis in a direction parallel to the longitudinal direction of the light introducing surface 1 facing the light introducing surface 1. And a straight tube lamp 6 having a direction.
前記導光板４は、屈折率が約1.492の透明アクリル樹脂
を実施例とし、反射面２は光導入面１の厚さよりも光導
入面１と反対側の面側の厚さが小さくなるように傾斜面
とすることにより臨界角反射させ、その反射光を透過発
光面３より透過させるようにしている。The light guide plate 4 is made of a transparent acrylic resin having a refractive index of about 1.492, and the reflection surface 2 has a thickness smaller than that of the light introducing surface 1 on the surface opposite to the light introducing surface 1. By forming an inclined surface, the light is reflected at a critical angle, and the reflected light is transmitted through the transmissive light emitting surface 3.
前記臨界角反射部５は、前記光導入面１に形成されたス
リットと、このスリットに装入された透明部材とからな
り、透明部材は屈折率が約１の空気を実施例としてい
る。The critical angle reflecting portion 5 is composed of a slit formed in the light introducing surface 1 and a transparent member inserted in the slit, and the transparent member uses air having a refractive index of about 1 as an example.
前記臨界角反射部５の傾斜角度Θについて、まず導光板
４の屈折率ｎとすると、臨界角αはsinα＝1/nを満た
し、入射光が臨界角よりも大きい入射角のとき臨界角反
射すなわち全反射する。ここで、入射角は（90−Θ）で
あるので、90−Θ≧αとなる。よってΘ≦90−αであ
る。そして、ｎ＝1.492の透明アルクル樹脂の場合、α
＝sin-1（1/n）＝42.1°であるので、Θ≦47.9°とな
る。Regarding the inclination angle Θ of the critical angle reflection portion 5, first, assuming that the refractive index n of the light guide plate 4 is, the critical angle α satisfies sin α = 1 / n, and when the incident light has an incident angle larger than the critical angle, the critical angle reflection occurs. That is, it is totally reflected. Here, since the incident angle is (90−Θ), 90−Θ ≧ α. Therefore, Θ ≦ 90−α. Then, in the case of transparent arcule resin of n = 1.492, α
= Sin -1 (1 / n) = 42.1 °, so Θ ≦ 47.9 °.
前記直管ランプ６は直管蛍光ランプを実施例としてい
る。The straight tube lamp 6 is a straight tube fluorescent lamp as an example.
第３図において、直管ランプ６の発光により光が光導入
面１に入射し臨界角反射部５に臨界角以上で入射した入
射光L1は、臨界角反射部５の屈折率が空気の屈折率であ
って導光板４の屈折率よりも小さくしかも入射角が臨界
角以上であるため臨界角反射部５で臨界角反射し、その
反射光L2は導光板４の一端部の方向に進む。また臨界角
反射部５は光導入面１の中央部で互いに反対向きに傾斜
しているため、それぞれ導光板４の両端部の方向に反射
する。また直管ランプ６の発光により光導入面１に臨界
角反射部５に臨界角以下で入射した入射光L3は臨界角反
射部５を透過し、さらに導光板４内に入射しその方向は
ほとんど変わらない。In FIG. 3, the incident light L 1 which is incident on the light introducing surface 1 by the light emission of the straight tube lamp 6 and is incident on the critical angle reflecting portion 5 at a critical angle or more has a refractive index of the critical angle reflecting portion 5 of the air. Since the refractive index is smaller than the refractive index of the light guide plate 4 and the incident angle is greater than or equal to the critical angle, the light is reflected by the critical angle reflection part 5 at the critical angle, and the reflected light L 2 is directed to one end of the light guide plate 4. move on. Further, since the critical angle reflecting portions 5 are inclined in opposite directions at the central portion of the light introducing surface 1, they are reflected in the directions of both ends of the light guide plate 4, respectively. Further, the incident light L 3 incident on the light introducing surface 1 at the critical angle reflecting portion 5 at a critical angle or less due to the light emission of the straight tube lamp 6 passes through the critical angle reflecting portion 5 and is further incident on the inside of the light guide plate 4 and its direction is Almost unchanged
この実施例によれば、導光板４の光導入面１に臨界角反
射部５を設けたため、光導入面１の長手方向の中央部の
入射光を導光板４の前記長手方向の両端部側に反射する
ことができる。また臨界角反射部５を臨界角反射しない
光は臨界角反射部５を透過するため、光効率を低下しな
い。したがって、装置を大型化することなくまた光効率
を低下することなく導光板４の透過発光面の輝度を均一
にすることができる。すなわちたとえば直管ランプ６の
長さよりも導光板４を広くしても透過発光面３の輝度を
均一にすることができる。According to this embodiment, since the critical angle reflecting portion 5 is provided on the light introducing surface 1 of the light guide plate 4, the incident light at the central portion of the light introducing surface 1 in the longitudinal direction is guided to both ends of the light guide plate 4 in the longitudinal direction. Can be reflected. Further, since light that does not reflect at the critical angle reflecting portion 5 passes through the critical angle reflecting portion 5, the light efficiency does not decrease. Therefore, the brightness of the transmissive light emitting surface of the light guide plate 4 can be made uniform without increasing the size of the device and reducing the light efficiency. That is, for example, even if the light guide plate 4 is wider than the length of the straight tube lamp 6, the brightness of the transmissive light emitting surface 3 can be made uniform.
この発明の第２の実施例を第４図に示す。すなわち、こ
の面照明装置は、臨界角反射部５を形成するスリット内
に導光板４よりも屈折率の小さい透光性材料を充填した
ものである。この場合、直管ランプ６へのもどり光のな
い傾斜角度Θは、Θ≦90°−sin-1（n2／n1）となる。n
1は導光板４の屈折率、n2は臨界角反射部５の屈折率と
する。A second embodiment of the present invention is shown in FIG. That is, in this surface illuminating device, the slit forming the critical angle reflecting portion 5 is filled with a translucent material having a smaller refractive index than the light guide plate 4. In this case, the inclination angle Θ without returning light to the straight tube lamp 6 is Θ ≦ 90 ° -sin −1 (n 2 / n 1 ). n
Let 1 be the refractive index of the light guide plate 4, and n 2 be the refractive index of the critical angle reflecting portion 5.
この実施例も第１の実施例と同様の屈折反射により、導
光板４の透過発光面３の均一な輝度が得られる。In this embodiment as well, uniform brightness of the transmissive light emitting surface 3 of the light guide plate 4 can be obtained by refraction and reflection similar to the first embodiment.
この発明の第３の実施例を第５図に示す。すなわち、こ
の面照明装置は、臨界角反射部５を形成するスリット内
に導光板４の屈折率1.492よりも大きい屈折率の材料た
とえば屈折率1.585のポリカーボネートを充填したもの
である。A third embodiment of the present invention is shown in FIG. That is, in this surface lighting device, a material having a refractive index higher than the refractive index of 1.492 of the light guide plate 4, for example, polycarbonate having a refractive index of 1.585 is filled in the slit forming the critical angle reflecting portion 5.
この実施例の場合、臨界角反射部５自体が小さなエッジ
ライトの効果をもち、矢印で示す光線のように臨界角反
射部５の奥端へ光が導かれ、その奥端を透過することに
より導光板４の両端部へ光を送ることができる。すなわ
ち入射光は臨界角反射部５を透過して臨界反射板５と導
光板４との境界面で臨界角反射し、第５図に示すような
反射透過により導光板４の両端部に進む。したがって、
この実施例も第１の実施例と同様な作用効果がある。In the case of this embodiment, the critical angle reflection portion 5 itself has a small edge light effect, and light is guided to the deep end of the critical angle reflection portion 5 as a ray shown by an arrow and transmitted through the deep end. Light can be sent to both ends of the light guide plate 4. That is, the incident light is transmitted through the critical angle reflector 5 and is reflected at the boundary surface between the critical reflector 5 and the light guide plate 4 at the critical angle, and travels to both ends of the light guide plate 4 by reflection and transmission as shown in FIG. Therefore,
This embodiment also has the same effects as the first embodiment.
なお、前記各実施例は導光板４の表面の一方のみが透過
発光面３であったが、表面の両面が透過発光面３すなわ
ち、両面とも光導入面１に対して傾斜を付けて反射を兼
ねた透過発光面３としてもよい。In each of the above-mentioned embodiments, only one surface of the light guide plate 4 is the transmissive light emitting surface 3, but both surfaces are transmissive and light emitting surfaces 3, that is, both surfaces are inclined with respect to the light introducing surface 1 to reflect. The transmissive light-emitting surface 3 that also serves may be used.
この発明の面照明装置によれば、導光板の光導入面に臨
界角反射部を設けたため、光導入面の長手方向の中央部
の入射光を導光板の前記長手方向の両端部側に反射する
ことができる。また臨界角反射部を臨界角反射しない光
は臨界角反射部を透過するため、光効率を低下しない。
したがって、装置を大型化することなくまた光効率を低
下することなく導光板の透過発光面の輝度を均一にする
ことができるという効果がある。According to the surface lighting device of the present invention, since the critical angle reflecting portion is provided on the light introducing surface of the light guide plate, the incident light at the central portion in the longitudinal direction of the light introducing surface is reflected to both ends of the light guide plate in the longitudinal direction. can do. Further, since light that does not reflect at the critical angle reflecting portion passes through the critical angle reflecting portion, the light efficiency does not decrease.
Therefore, there is an effect that the brightness of the transmissive light emitting surface of the light guide plate can be made uniform without increasing the size of the device and reducing the light efficiency.
第１図はこの発明の第１の実施例の平面図、第２図はそ
の側面図、第３図は導光板の光導入面付近の部分拡大平
面図、第４図は第２の実施例の導光板の光導入面付近の
部分拡大平面図、第５図は第３の実施例の光導入面付近
の部分拡大平面図、第６図は従来例の側面図、第７図は
その平面図、第８図は提案例の平面図である。 １…光導入面、２…反射面、３…透過発光面、４…導光
板、５…臨界角反射部、６…直管ランプFIG. 1 is a plan view of a first embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a partially enlarged plan view of the vicinity of a light introducing surface of a light guide plate, and FIG. 4 is a second embodiment. FIG. 5 is a partially enlarged plan view of the light guide plate in the vicinity of the light introduction surface, FIG. 5 is a partially enlarged plan view in the vicinity of the light introduction surface of the third embodiment, FIG. 6 is a side view of the conventional example, and FIG. FIG. 8 is a plan view of the proposed example. DESCRIPTION OF SYMBOLS 1 ... Light introduction surface, 2 ... Reflection surface, 3 ... Transmission light emission surface, 4 ... Light guide plate, 5 ... Critical angle reflection part, 6 ... Straight tube lamp
Claims (2)
の少なくとも一方を透過発光面としかつ前記透過発光面
と反対側の表面を前記光導入面より入射した光を前記透
過発光面に反射する反射面とした所定の屈折率を有する
導光板と、この導光板と異なる屈折率を有し前記光導入
面の厚さ方向に平行な板形状であって前記光導入面の長
手方向に複数個埋設状態に形成されるとともに前記光導
入面の前記長手方向の中央部を境にそれぞれ内端部が前
記光導入面の前記長手方向の両端に接近する方向に傾斜
した臨界角反射部と、前記光導入面に対向して前記光導
入面の前記長手方向と平行な方向に軸方向を有する直管
ランプとを備えた面照明装置。1. A flat plate-shaped one side surface having a light-introducing surface, at least one of the surfaces being a transmissive-light-emitting surface, and a surface opposite to the transmissive-light-emissive surface that receives light incident from the light-introducing surface. A light guide plate having a predetermined refractive index as a reflecting surface that reflects light, and a plate shape parallel to the thickness direction of the light introducing surface and having a different refractive index from the light guide plate, and the longitudinal direction of the light introducing surface. And a plurality of the critical angle reflecting portions that are formed in a buried state and that are inclined in a direction in which inner ends of the light introducing surface approach both ends of the light introducing surface in the longitudinal direction with the central portion of the light introducing surface as a boundary. And a straight tube lamp facing the light introducing surface and having a straight tube lamp having an axial direction parallel to the longitudinal direction of the light introducing surface.
されたスリットと、このスリットに装入された透明部材
とからなる特許請求の範囲第（１）項記載の面照明装
置。2. The surface lighting device according to claim 1, wherein the critical angle reflecting portion comprises a slit formed in the light introducing surface and a transparent member inserted in the slit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61177351A JPH07107567B2 (en) | 1986-07-28 | 1986-07-28 | Surface lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61177351A JPH07107567B2 (en) | 1986-07-28 | 1986-07-28 | Surface lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6333702A JPS6333702A (en) | 1988-02-13 |
| JPH07107567B2 true JPH07107567B2 (en) | 1995-11-15 |
Family
ID=16029449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61177351A Expired - Lifetime JPH07107567B2 (en) | 1986-07-28 | 1986-07-28 | Surface lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07107567B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63206707A (en) * | 1987-02-23 | 1988-08-26 | Kyoei Plast Kogeisha:Kk | Light transmission body |
| JP4038884B2 (en) * | 1998-06-23 | 2008-01-30 | カシオ計算機株式会社 | Display device |
| JP2007025705A (en) * | 1999-12-17 | 2007-02-01 | Toshiba Corp | Line lighting device and image input device |
| JP2002062434A (en) | 2000-08-08 | 2002-02-28 | Internatl Business Mach Corp <Ibm> | Light guide plate, side light type light source device and image display device |
-
1986
- 1986-07-28 JP JP61177351A patent/JPH07107567B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6333702A (en) | 1988-02-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5485291A (en) | Uniformly thin, high efficiency large area lighting panel with two facet grooves that are spaced apart and have light source facing facets with smaller slopes than the facets facing away from the light source | |
| KR930005432B1 (en) | Back light device | |
| KR910001084B1 (en) | Light diffuser | |
| KR101604243B1 (en) | Light guide plate, backlight unit and liquid crystal display having the same | |
| JPH0262585A (en) | Transmission type liquid crystal display device | |
| JP2000011723A (en) | Planar lighting device | |
| JP2011509500A (en) | Lighting system, lighting fixture and backlight unit | |
| US7134777B2 (en) | Surface lighting device with closed oblique reflector | |
| JPH07114024A (en) | Backlight | |
| JPH0627327A (en) | Lighting equipment | |
| JPH05307365A (en) | Surface light emission device | |
| JPH0553111A (en) | Light guiding plate structure of thin edge light type liquid crystal display device | |
| JPH11219610A (en) | Lighting equipment | |
| JP4047437B2 (en) | Linear light projection device and flat illumination device | |
| JP3500098B2 (en) | Lighting device and display device | |
| JPH09230338A (en) | Lighting equipment | |
| JP2002100231A (en) | Surface light source type lighting system | |
| JP2504417B2 (en) | Surface lighting device | |
| JP3074747B2 (en) | Lighting equipment | |
| JP2000011722A (en) | Flat lighting device | |
| JPS6333702A (en) | Surface luminaire | |
| JP3023026B2 (en) | Surface lighting device | |
| JP3246013B2 (en) | Instrument pointer | |
| US11520099B2 (en) | Backlight module | |
| JPH1091079A (en) | Backlight device and flat display device |