JP3414389B2 - Liquid crystal display device and portable terminal - Google Patents
Liquid crystal display device and portable terminalInfo
- Publication number
- JP3414389B2 JP3414389B2 JP2001191835A JP2001191835A JP3414389B2 JP 3414389 B2 JP3414389 B2 JP 3414389B2 JP 2001191835 A JP2001191835 A JP 2001191835A JP 2001191835 A JP2001191835 A JP 2001191835A JP 3414389 B2 JP3414389 B2 JP 3414389B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- light
- light guide
- display device
- 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 - Fee Related
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、照明機能を有する
液晶表示装置のような表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device such as a liquid crystal display device having a lighting function.
【０００２】[0002]
【従来の技術】従来、照明機能を有する液晶表示装置は
図６（ａ）に示すように、被照明体である液晶表示体２
の背面に面状の照明装置１を配置し、通常は常時照明を
点灯して使用していたか、あるいは図６（ｂ）に示すよ
うに液晶表示体２と照明装置１の間に半透過半反射のシ
ート４を配置して、照明点灯、非点灯の両方で使用でき
るようにしていた。2. Description of the Related Art Conventionally, a liquid crystal display device having an illumination function is, as shown in FIG.
The planar illuminating device 1 is arranged on the back surface of the illuminating device, and normally, the illuminating device is normally turned on for use, or as shown in FIG. The reflection sheet 4 is arranged so that it can be used both for lighting and non-lighting.
【０００３】[0003]
【発明が解決しようとする課題】しかし、かかる従来の
照明機能を有する液晶表示装置は、常時照明を点灯して
使用した場合、電力消費が大きい、半透過半反射のシー
トを使用した場合、照明装置点灯時、非点灯時ともに表
示が暗く、コントラストが低いという問題点を有してい
た。However, such a conventional liquid crystal display device having a lighting function consumes a large amount of power when the lighting is constantly turned on and used. There is a problem that the display is dark and the contrast is low both when the device is turned on and when it is not turned on.
【０００４】そこで、本発明は、従来のこのような問題
点を解決するため、照明装置を液晶表示体のような表示
体の前面に配置することにより、照明装置の点灯時、非
点灯時ともに、コントラストが高く視認性の高い表示装
置を提供することを目的とする。Therefore, in order to solve such a conventional problem, the present invention arranges the lighting device in front of a display body such as a liquid crystal display body so that the lighting device is turned on and off. An object of the present invention is to provide a display device having high contrast and high visibility.
【０００５】[0005]
【課題を解決するための手段】本発明の液晶表示装置
は、液晶表示体と、前記液晶表示体の前面に配置された
照明装置と、を有する液晶表示装置であって、前記照明
装置は、透明な導光体と、前記導光体の端面側に配置さ
れた光源とを有し、前記導光体の液晶表示体側の面に
は、出光側平面、前記出光側平面と平行方向の面、及び
前記出光側平面と垂直方向の面とにより形成された凹凸
形状を設けられてなり、前記導光体は、前記光源が消灯
しているとき、外光を前記液晶表示体側に透過し、前記
液晶表示体側で反射した光を透過することを特徴とす
る。A liquid crystal display device according to the present invention is a liquid crystal display device having a liquid crystal display body and an illuminating device arranged in front of the liquid crystal display body, wherein the illuminating device comprises: It has a transparent light guide and a light source arranged on the end face side of the light guide, and the liquid crystal display side surface of the light guide has a light exit side plane and a surface parallel to the light exit side plane. , And provided with a concavo-convex shape formed by the light output side plane and a surface in the vertical direction, the light guide body, when the light source is turned off, transmits external light to the liquid crystal display body side, It is characterized in that the light reflected on the liquid crystal display side is transmitted.
【０００６】本発明の携帯用端末は、液晶表示装置を備
えた携帯用端末であって、前記液晶表示装置は、液晶表
示体と前記液晶表示体の前面に配置された照明装置とを
有してなり、前記照明装置は、透明な導光体と、前記導
光体の端面側に配置された光源と、を有し、前記導光体
の液晶表示体側の面には、出光側平面、前記出光側平面
と平行方向の面、及び前記出光側平面と垂直方向の面と
により形成された凹凸形状を設けられてなり、前記導光
体は、前記光源が消灯しているとき、外光を前記液晶表
示体側に透過し、前記液晶表示体側で反射した光を透過
することを特徴とする。A portable terminal of the present invention is a portable terminal equipped with a liquid crystal display device, wherein the liquid crystal display device has a liquid crystal display body and an illuminating device arranged in front of the liquid crystal display body. The illumination device has a transparent light guide and a light source arranged on the end face side of the light guide, and a surface on the liquid crystal display side of the light guide has a light exit side plane, The light guide body is provided with a concavo-convex shape formed by a surface parallel to the light exit side plane and a surface perpendicular to the light exit side plane, and the light guide body receives external light when the light source is off. Is transmitted to the liquid crystal display body side, and the light reflected on the liquid crystal display body side is transmitted.
【０００７】[0007]
【発明の実施の形態】以下に本発明の実施例を図面に基
づいて説明する。図１は本発明の表示装置の全体を示す
図であり、照明装置１は液晶表示体２の前面に配置され
る。液晶表示体２の背面には反射板３を配置し、反射型
液晶表示体を構成している。照明装置１は液晶表示体２
側に光線を投射するとともに反射板３によって反射した
光線をほとんど分散することなく、透過する機能を有す
る。これは外光が充分にあるときには照明装置１を消灯
して使用し、この場合、照明装置１は単なる透明板とし
て作用して視認性を落とさず、表示品質に影響を与えな
いことに有効である。また外光が充分でない暗い所では
点灯して使用した場合、照明装置１は液晶表示体２を照
明し、反射板３による反射光は照明装置１が前述の消灯
時と同様に単なる透明板として機能してそのまま透過す
るため高い視認性を保持するために有効である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an entire display device of the present invention, and an illuminating device 1 is arranged in front of a liquid crystal display body 2. A reflective plate 3 is arranged on the back surface of the liquid crystal display body 2 to form a reflective liquid crystal display body. The lighting device 1 is a liquid crystal display 2
It has a function of projecting a light beam to the side and transmitting the light beam reflected by the reflection plate 3 with almost no dispersion. This is effective when the illuminating device 1 is turned off and used when there is sufficient external light. In this case, the illuminating device 1 acts as a mere transparent plate, does not reduce the visibility, and is effective in not affecting the display quality. is there. When the lighting device 1 is used by lighting it in a dark place where the external light is not sufficient, the lighting device 1 illuminates the liquid crystal display body 2, and the light reflected by the reflecting plate 3 is a transparent plate just as when the lighting device 1 is turned off. It is effective for maintaining high visibility because it functions and transmits as it is.
【０００８】また照明装置１を液晶表示体２の背面に配
置した透過型液晶表示装置は、照明装置１からの光線が
液晶表示体２を１回のみ透過して明部暗部のコントラス
トを発生しているのに対し、本発明のような照明装置１
を液晶表示体２の前面に配置した反射型液晶表示装置
は、照明装置１からの光線が１回液晶表示体２を透過し
たのち反射板によって反射してもう１回透過するため、
よりコントラストが高くなることにより高い視認性を得
るために有効になっている。Further, in the transmissive liquid crystal display device in which the illuminating device 1 is arranged on the back surface of the liquid crystal display body 2, the light beam from the illuminating device 1 is transmitted through the liquid crystal display body 2 only once to generate contrast in bright and dark areas. In contrast, the lighting device 1 according to the present invention
In the reflection type liquid crystal display device in which is arranged on the front surface of the liquid crystal display body 2, since the light beam from the illumination device 1 is transmitted through the liquid crystal display body 2 once, is reflected by the reflection plate and is transmitted again.
The higher contrast is effective for obtaining high visibility.
【０００９】以上のような照明装置を実現するために一
実施例を図２（ａ）に示す。光源１２が導光体１１の少
なくとも１つの端面側に配置される。導光体１１は図２
（ｂ）に示すように、透明板の片面に光源２と概ね平行
にリブ上の突起１３を設けており、突起１３の各面はす
べて出光側平面１４に対して略平行な面と略垂直な面の
みで構成される。即ち、導光体１１の出光側の面には、
出光側平面１４、前記出光側平面１４と平行方向の面、
及び前記出光側平面１４と垂直方向の面とにより凹凸形
状が形成されている。導光体１１は屈折率１．４以上の
透明材料で形成される。光源１２からの光線は光線１６
ａや光線１６ｂに示すように端面１５から入射したの
ち、導光体１１の中で全反射を繰り返し突起１３の側面
からのみ射出するため照明装置１の背面からの出光を多
くし、液晶表示体を照明することができる。FIG. 2 (a) shows an embodiment for realizing the illumination device as described above. The light source 12 is arranged on at least one end surface side of the light guide body 11. The light guide 11 is shown in FIG.
As shown in (b), a protrusion 13 on a rib is provided on one surface of the transparent plate substantially parallel to the light source 2, and each surface of the protrusion 13 is substantially perpendicular to a surface substantially parallel to the light output side plane 14. It is composed only of different faces. That is, on the surface of the light guide 11 on the light output side,
The light output side plane 14, a surface parallel to the light output side plane 14,
Further, the uneven surface is formed by the light exit side flat surface 14 and the surface in the vertical direction. The light guide 11 is made of a transparent material having a refractive index of 1.4 or more. The ray from the light source 12 is the ray 16
After entering from the end face 15 as shown by a and a ray 16b, total reflection is repeatedly emitted in the light guide 11 only from the side surface of the protrusion 13, so that the light emitted from the back surface of the lighting device 1 is increased and the liquid crystal display body Can be illuminated.
【００１０】また、導光体１１を形成する透明材料はア
クリル樹脂、ポリカーボネート樹脂等の透明樹脂、ガラ
ス等の無機透明材料またはそれらの複合体が用いられ、
射出成形、光硬化樹脂、エッチング、透明樹脂またはガ
ラス平坂上にフィルムを接合する等の方法によって形成
される。As the transparent material forming the light guide 11, a transparent resin such as an acrylic resin or a polycarbonate resin, an inorganic transparent material such as glass, or a composite thereof is used.
It is formed by a method such as injection molding, photo-curing resin, etching, bonding a film on a transparent resin or glass flat plate.
【００１１】図３（ａ）に示すように端面１５から入射
した光線は導光体１１の長辺方向の軸に対して屈折によ
り４５度以下の光軸を持つため、突起１３の側面に照射
されるためには突起１３の幅に対してそれ以上の高さを
必要とする。それ以下の場合、図３（ｂ）に示すような
経路により光線は照明装置１の上面に出光し、大きく視
認性を低下させる。しかしー対ーを大きく超えた場合に
は光学的に無意味であるばかりでなく、製造が困難にな
るという問題が生じる。以上により、突起１３は幅と高
さの比がちょうどー対ー程度であることが望ましい。As shown in FIG. 3A, since the light ray incident from the end face 15 has an optical axis of 45 degrees or less due to refraction with respect to the axis of the light guide 11 in the long side direction, it is irradiated to the side surface of the protrusion 13. In order to be performed, a height higher than the width of the protrusion 13 is required. In the case of less than that, the light ray is emitted to the upper surface of the illumination device 1 through the path as shown in FIG. However, if the number of pairs is greatly exceeded, not only is it optically meaningless, but there is also the problem that manufacturing becomes difficult. From the above, it is desirable that the protrusion 13 has a width-height ratio of just about -to-.
【００１２】突起１３の幅、高さといった大きさは、可
視光の波長がおよそ３８０ｎｍから７００ｎｍ程度であ
ることから、回折による干渉により分光の縞模様が発生
しないために５μｍ程度以上は必要であり、また液晶表
示体の画素の大きさが２００μｍから３００μｍである
ことから、この画素との干渉による縞模様の発生を防ぐ
ために１００μｍ以下にすべきである。以上の内容に加
え、製造上の利便性から突起１３の大きさはおよそ１０
μｍ以上５０μｍ以下が望ましい。導光体１１上の突起
１３の密度を加減することにより、照射輝度の均一性を
高めることができる。実際には光源１２の近傍では突起
１３を疎に配置し、離れるに従い連続的に密に配置して
いく。この場合、突起１３の大きさをー定にして密度を
可変する方法、密度を一定にして大きさを可変する方
法、両方を可変する方法等が取られる。The width and height of the protrusions 13 are required to be about 5 μm or more in order that the wavelength of visible light is about 380 nm to 700 nm, so that a spectral stripe pattern does not occur due to interference due to diffraction. Moreover, since the size of the pixel of the liquid crystal display is 200 μm to 300 μm, it should be 100 μm or less in order to prevent the occurrence of a stripe pattern due to interference with this pixel. In addition to the above contents, the size of the protrusion 13 is approximately 10 due to manufacturing convenience.
It is desirable that the thickness is in the range of μm to 50 μm. By adjusting the density of the protrusions 13 on the light guide 11, the uniformity of the irradiation brightness can be improved. Actually, the protrusions 13 are arranged sparsely in the vicinity of the light source 12, and are continuously arranged densely as they are separated. In this case, a method in which the size of the protrusions 13 is fixed and the density is varied, a method in which the density is fixed and the size is varied, a method in which both are varied, and the like are used.
【００１３】他の実施例を図４（ａ）に示す。突起１３
を角柱状に形成した場合もリブと同等の効果が得られ
る。突起１３の光源１２と垂直をなす側面は光線が臨界
角以上で照射されるため、全反射され出光にはいっさい
関係しない。図４（ｂ）に示すように概長方形の導光体
１１上に正方形の底面を持った角柱を形成した場合、隣
合う二辺に光源１２を配置し、二辺から入射した光線を
突起１３の各側面から出光させることができる。Another embodiment is shown in FIG. Protrusion 13
Even when formed into a prismatic shape, the same effect as the rib can be obtained. Since the side surface of the protrusion 13 which is perpendicular to the light source 12 is irradiated with a light ray at a critical angle or more, it is totally reflected and has nothing to do with the emitted light. As shown in FIG. 4B, when a prism having a square bottom surface is formed on the light guide 11 having a substantially rectangular shape, the light sources 12 are arranged on two adjacent sides and the light rays incident from the two sides are projected 13. The light can be emitted from each side of the.
【００１４】他の実施例として突起１３を円柱状に形成
した場合を図５（ａ）に示す。突起１３の円柱面に臨界
角以下で照射された光線は出光し、臨界角以上で照射さ
れた光線は円柱面で反射を繰り返したのち、突起１３の
底面で反転し、さらに円柱面で反射を繰り返して、再び
導光体内を進行する経路をたどる。円柱面から出光した
光線は図５（ｃ）に示す角柱のときの場合に比べ図５
（ｂ）に示すように照射範囲を広くすることができる。As another embodiment, FIG. 5A shows a case where the projection 13 is formed in a cylindrical shape. Light rays irradiated on the cylindrical surface of the protrusion 13 at a critical angle or less are emitted, and light rays irradiated at a critical angle or more repeat reflection on the cylindrical surface, then are inverted on the bottom surface of the projection 13 and are reflected on the cylindrical surface. Repeatingly, the path of traveling inside the light guide body is traced again. The light beam emitted from the cylindrical surface is shown in FIG. 5 as compared with the case of the prism shown in FIG.
The irradiation range can be widened as shown in (b).
【００１５】[0015]
【発明の効果】本発明によると、以上説明したように、
表示装置が、例えば液晶表示携帯用電算機端末のような
用途において、省電力のため明るいところでは照明を消
して使用しても表示品質を落とさず、点灯時でもコント
ラストの高い表示を可能とすることができる。According to the present invention, as described above,
In applications such as liquid crystal display portable computer terminals, the display device does not deteriorate the display quality even when the light is turned off in a bright place for power saving, and enables high-contrast display even when turned on. be able to.
【図１】本発明のー実施例を示す断面図。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】本発明の他の実施例を示す図。FIG. 2 is a diagram showing another embodiment of the present invention.
【図３】本発明の他の実施例を示す図。FIG. 3 is a diagram showing another embodiment of the present invention.
【図４】本発明の他の実施例を示す図。FIG. 4 is a diagram showing another embodiment of the present invention.
【図５】本発明の他の実施概を示す図。FIG. 5 is a view showing the outline of another embodiment of the present invention.
【図６】従来の技術を示す図。FIG. 6 is a diagram showing a conventional technique.
１ 照明装置 ２ 液晶表示体 ３ 反射板 １１ 導光体 １２ 光源 １３ 突起 １４ 出光側平面 １５ 端面 １６ 光線 1 Lighting device 2 Liquid crystal display 3 reflector 11 Light guide 12 light sources 13 Protrusion 14 Light exit side plane 15 End face 16 rays
フロントページの続き (56)参考文献 特開 平４−97129（ＪＰ，Ａ) 特開 昭62−109003（ＪＰ，Ａ) 特開 平５−158034（ＪＰ，Ａ) 特開 平５−60920（ＪＰ，Ａ) 特開 昭56−111882（ＪＰ，Ａ) 特開 平６−324331（ＪＰ，Ａ) 実開 平２−41227（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G09F 9/00 F21V 8/00 G02F 1/13357 Continuation of the front page (56) Reference JP-A-4-97129 (JP, A) JP-A-62-109003 (JP, A) JP-A-5-158034 (JP, A) JP-A-5-60920 (JP , A) JP-A-56-111882 (JP, A) JP-A-6-324331 (JP, A) Actual Kaihei 2-41227 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB) Name) G09F 9/00 F21V 8/00 G02F 1/13357
Claims (2)
置された照明装置と、を有する液晶表示装置であって、 前記照明装置は、透明な導光体と、前記導光体の端面側
に配置された光源とを有し、 前記導光体の液晶表示体側の面には、出光側平面、前記
出光側平面と平行方向の面、及び前記出光側平面と垂直
方向の面とにより形成された凹凸形状を設けられてな
り、 前記導光体は、前記光源が消灯しているとき、外光を前
記液晶表示体側に透過し、前記液晶表示体側で反射した
光を透過することを特徴とする液晶表示装置。1. A liquid crystal display device comprising a liquid crystal display body and a lighting device arranged in front of the liquid crystal display body, wherein the lighting device comprises a transparent light guide body and a light guide body of the light guide body. And a light source arranged on the end face side, on the surface of the light guide body on the liquid crystal display side, a light exit side plane, a surface parallel to the light exit side plane, and a surface perpendicular to the light exit side plane. The light guide body transmits external light to the liquid crystal display body side and transmits light reflected on the liquid crystal display body side when the light source is turned off. Liquid crystal display device characterized by.
て、 前記液晶表示装置は、液晶表示体と前記液晶表示体の前
面に配置された照明装置とを有してなり、 前記照明装置は、透明な導光体と、前記導光体の端面側
に配置された光源と、を有し、 前記導光体の液晶表示体側の面には、出光側平面、前記
出光側平面と平行方向の面、及び前記出光側平面と垂直
方向の面とにより形成された凹凸形状を設けられてな
り、 前記導光体は、前記光源が消灯しているとき、外光を前
記液晶表示体側に透過し、前記液晶表示体側で反射した
光を透過することを特徴とする携帯用端末。2. A portable terminal comprising a liquid crystal display device, wherein the liquid crystal display device comprises a liquid crystal display body and an illuminating device arranged in front of the liquid crystal display body. Has a transparent light guide and a light source arranged on an end face side of the light guide, and a surface on the liquid crystal display side of the light guide has a light exit side plane and is parallel to the light exit side plane. Direction surface, and a concave-convex shape formed by the light output side plane and a surface in the vertical direction, the light guide body, when the light source is turned off, outside light to the liquid crystal display body side. A portable terminal which transmits the light and transmits the light reflected on the liquid crystal display side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001191835A JP3414389B2 (en) | 2001-06-25 | 2001-06-25 | Liquid crystal display device and portable terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001191835A JP3414389B2 (en) | 2001-06-25 | 2001-06-25 | Liquid crystal display device and portable terminal |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08034798A Division JP3289671B2 (en) | 1998-03-12 | 1998-03-12 | Display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002072899A JP2002072899A (en) | 2002-03-12 |
| JP3414389B2 true JP3414389B2 (en) | 2003-06-09 |
Family
ID=19030388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001191835A Expired - Fee Related JP3414389B2 (en) | 2001-06-25 | 2001-06-25 | Liquid crystal display device and portable terminal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3414389B2 (en) |
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2001
- 2001-06-25 JP JP2001191835A patent/JP3414389B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002072899A (en) | 2002-03-12 |
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