JPH1184116A - Translucent type reflector and liquid crystal display device using the same - Google Patents
Translucent type reflector and liquid crystal display device using the sameInfo
- Publication number
- JPH1184116A JPH1184116A JP9236289A JP23628997A JPH1184116A JP H1184116 A JPH1184116 A JP H1184116A JP 9236289 A JP9236289 A JP 9236289A JP 23628997 A JP23628997 A JP 23628997A JP H1184116 A JPH1184116 A JP H1184116A
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- display device
- crystal display
- transmitted
- 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.)
- Withdrawn
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 40
- 239000000758 substrate Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 239000010408 film Substances 0.000 description 50
- 239000011521 glass Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光を透過する機能
と反射する機能を合わせ持つ半透過型反射体およびこの
半透過型反射体を有する液晶表示装置に関する。The present invention relates to a transflective reflector having both a function of transmitting light and a function of reflecting light, and a liquid crystal display device having the transflective reflector.
【０００２】[0002]
【従来の技術】一般に、液晶表示装置の表示形態には、
バックライトを備えた透過型と呼ばれるものと、太陽や
照明などの光を利用してバックライトなしで表示する反
射型と呼ばれるものがある。透過型の液晶表示装置は、
バックライトを使用することで明るい表示面を得ること
ができるが、バックライト用の電源を使用する分消費電
力が多くなるという欠点がある。逆に、反射型の液晶表
示装置は、バックライトを使用しない分消費電力を低減
することができるが、透過型と比較して表示面がやや暗
くなってしまう欠点がある。2. Description of the Related Art In general, display modes of a liquid crystal display device include:
There is a transmission type having a backlight, and a reflection type in which display is performed without a backlight using light such as the sun or illumination. Transmissive liquid crystal display devices
Although a bright display surface can be obtained by using a backlight, there is a disadvantage that power consumption is increased by using a power supply for the backlight. Conversely, a reflective liquid crystal display device can reduce power consumption by not using a backlight, but has a drawback that a display surface is slightly darker than a transmissive liquid crystal display device.
【０００３】[0003]
【発明が解決しようとする課題】そこで、反射型液晶表
示装置と透過型液晶表示装置の長所を合わせ持つ液晶表
示装置が従来より提案されている。これは、反射型液晶
表示装置で用いられる反射体を半透明にしたり、反射体
に微細な穴をあけることで、反射体が外光を反射すると
同時にバックライトの光も透過する機能を持たせたりし
たものであるが、このものにあっても、光の反射が不十
分であったりバックライトの光の損失が大きかったりし
て、反射型液晶表示装置、透過型液晶表示装置のいずれ
として用いる場合でも十分な明るさを得ることはできな
かった。上記の点に鑑み、本発明は、バックライトの透
過光および外光の反射光を有効にバランス良く利用でき
る半透過型反射体および消費電力を必要以上に増大する
ことなく、周囲の明るさによらずに表示の視認が可能な
液晶表示装置を提供することを目的とする。Therefore, a liquid crystal display device having both advantages of a reflection type liquid crystal display device and a transmission type liquid crystal display device has been proposed. This is to make the reflector used in the reflection type liquid crystal display device translucent or to make a fine hole in the reflector to have the function of reflecting the external light and transmitting the backlight light at the same time. However, even in this case, because of insufficient reflection of light or large loss of light of the backlight, it is used as either a reflection type liquid crystal display device or a transmission type liquid crystal display device. Even in this case, it was not possible to obtain sufficient brightness. In view of the above, the present invention provides a semi-transmissive reflector that can effectively use the transmitted light of the backlight and the reflected light of the external light in a well-balanced manner. It is an object of the present invention to provide a liquid crystal display device capable of visually recognizing a display without depending on the display.
【０００４】[0004]
【課題を解決するための手段】本発明に係る半透過性反
射体は、光を透過する基体の表面に、断面形状が三角形
の多数の透光性突条が連設され、該各突条の同じ側に傾
斜する斜面にのみ反射膜が設けられ、他の側の斜面には
光が透過することを特徴とする。このような半透過型反
射体においては、反射膜が外光を反射すると同時に、反
射膜が設けられている部分以外はバックライトの光を透
過するので、反射光と透過光を効率的に利用することが
できる。In the semi-transparent reflector according to the present invention, a large number of light-transmitting ridges having a triangular cross section are continuously provided on the surface of a light-transmitting substrate. The reflective film is provided only on the inclined surface inclined on the same side of the above, and light is transmitted on the other inclined surface. In such a semi-transmissive reflector, the reflection film reflects the external light, and at the same time, transmits the light of the backlight except for the portion where the reflection film is provided, so that the reflected light and the transmitted light are used efficiently. can do.
【０００５】本発明の半透過型反射体に用いられる光を
透過する基体としては、例えばポリカーボネート、アク
リル樹脂などを挙げることができる。本発明の半透過型
反射体に設けられる反射膜は、例えばアルミニウム、銀
などを基体上の多数の突条の片側の斜面上に蒸着などの
方法により形成することができる。[0005] Examples of the substrate that transmits light used in the semi-transmissive reflector of the present invention include polycarbonate and acrylic resin. The reflective film provided on the semi-transmissive reflector of the present invention can be formed by, for example, vapor deposition of aluminum, silver, or the like on one slope of a large number of ridges on the substrate.
【０００６】本発明の半透過型反射体においては、光が
透過する側の突条の断面三角形の辺の長さに対する、反
射膜が設けられた側の突条の断面三角形の辺の長さの割
合が１対０．７ないし１対２であることが好ましい。そ
の理由は、光が透過する辺の長さを１としたとき、反射
膜が設けられている辺の長さの割合が０．７未満では、
半透過型反射体に占める反射膜部分が少なすぎて反射光
を有効に利用できないからである。逆に、反射膜が設け
られている辺の長さの割合が２を超えると、半透過型反
射体に占める反射膜部分が多すぎて、バックライトの光
が反射膜に遮られ過ぎるので透過光を有効に利用できな
いからである。In the semi-transmissive reflector according to the present invention, the length of the side of the triangular section of the ridge on the side where the reflection film is provided is the length of the side of the triangular section of the ridge on the side through which light is transmitted. Is preferably 1: 0.7 to 1: 2. The reason is that when the length of the side through which light is transmitted is 1 and the ratio of the length of the side where the reflective film is provided is less than 0.7,
This is because the reflection film portion occupying the semi-transmissive reflector is too small and the reflected light cannot be used effectively. Conversely, if the ratio of the length of the side on which the reflection film is provided exceeds 2, the reflection film portion occupies too much of the semi-transmissive reflector, and the light of the backlight is blocked too much by the reflection film, so that the light is transmitted. This is because light cannot be used effectively.
【０００７】また、本発明の半透過型反射体において
は、その表面に設けられた断面三角形の頂点を通る垂線
と、反射膜が設けられた側の突条の断面三角形の辺との
なす角度が２０度ないし７０度であることが好ましい。
その理由は、この角度が２０度未満であると反射面が垂
直に近づきすぎ、この半透過型反射体を使用して液晶表
示装置を作成した際に、反射光の反射角度が液晶表示装
置の表示面に対して平行に近くなり、反射光を有効に利
用できないからである。逆に、この角度が７０度を超え
ると、透過光で液晶表示装置を見る場合、やはり表示面
に対して平行に近くなるため、前記素子の視野角依存性
の観点から表示が見づらくなるからである。すなわち、
透過光を有効利用するには、表示面積に対する反射膜面
積をできるだけ小さくすることが望ましく、反射膜の設
けられた面と平行に近い状態で見る必要があるので、視
野角が狭くなるという問題があるからである。In the semi-transmissive reflector according to the present invention, the angle formed between the perpendicular passing through the vertex of the triangular cross section provided on the surface and the side of the triangular cross section of the ridge on the side provided with the reflective film. Is preferably 20 to 70 degrees.
The reason for this is that if this angle is less than 20 degrees, the reflection surface becomes too close to vertical, and when a liquid crystal display device is manufactured using this transflective reflector, the reflection angle of the reflected light is less than that of the liquid crystal display device. This is because the light is almost parallel to the display surface, and the reflected light cannot be used effectively. On the other hand, if the angle exceeds 70 degrees, when the liquid crystal display device is viewed with transmitted light, the display device is also nearly parallel to the display surface, so that it becomes difficult to view the display from the viewpoint of the viewing angle dependence of the element. is there. That is,
In order to make effective use of transmitted light, it is desirable to reduce the area of the reflective film with respect to the display area as much as possible, and it is necessary to view the display in a state close to being parallel to the surface provided with the reflective film. Because there is.
【０００８】すなわち、本発明の半透過型反射体は、光
を透過する基体の表面に断面形状が三角形の多数の透光
性突条が連設されており、これら突条の同じ側に傾斜す
る斜面にのみ反射膜が設けられ、他の側の斜面において
は光が透過することを特徴とし、光が反射する部分と光
が透過する部分をバランスよく合わせ持ち、これら部分
の割合が制御しやすくなっている。また、本発明の半透
過型反射体を有する液晶表示装置は、反射型と透過型の
利点を合わせ持ち、バックライトの透過光および外光の
反射光を有効に利用できるので、高表示品位を維持しつ
つ低消費電力化を図ることができる。That is, in the semi-transmissive reflector of the present invention, a large number of light-transmitting ridges having a triangular cross section are continuously provided on the surface of a light-transmitting base, and the ridges are inclined on the same side. The reflective film is provided only on the slope that is to be reflected, and the light is transmitted on the other slope, and the light reflected part and the light transmitted part are well balanced, and the ratio of these parts is controlled. It is easier. Further, the liquid crystal display device having the transflective reflector of the present invention has both the advantages of the reflective type and the transmissive type, and can effectively utilize the transmitted light of the backlight and the reflected light of the external light, thereby achieving high display quality. Low power consumption can be achieved while maintaining the same.
【０００９】[0009]
【発明の実施の形態】以下、図面により本発明について
さらに詳細に説明するが、本発明はこれらの実施形態例
のみに限定されるものではない。図１は、本発明の半透
過型反射体の一例を示す部分拡大図であり、図中符号１
は半透過型反射体、符号２はプリズムシート（光を透過
する基体）、符号３は反射膜である。図１に示すよう
に、半透過型反射体１は、プリズムシート２の表面に断
面形状が三角形の透光性を持つ多数の突条が連設されて
おり、これら突条の同じ側に傾斜する斜面にのみ反射膜
３、３…を形成してなるものである。この反射膜３、３
…が形成されていない斜面においては、光を透過するよ
うになっている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings, but the present invention is not limited to only these embodiments. FIG. 1 is a partially enlarged view showing an example of the transflective reflector of the present invention.
Denotes a transflective reflector, 2 denotes a prism sheet (substrate that transmits light), and 3 denotes a reflective film. As shown in FIG. 1, a semi-transmissive reflector 1 is provided with a number of ridges having a triangular cross-sectional shape on the surface of a prism sheet 2 and having a triangular cross section. Are formed only on the inclined surface to be formed. The reflection films 3, 3
.. Are not formed, light is transmitted.
【００１０】図２は、本発明の半透過型反射体の突条の
断面三角形部分の拡大図である。本発明の半透過型反射
体においては、光が透過する側の突条の断面三角形の辺
の長さＬ1に対する、反射膜が設けられた側の突条の断
面三角形の辺の長さＬ2の割合（Ｌ1対Ｌ2）が１対０．
７ないし１対２であることが好ましい。その理由は、辺
Ｌ1の長さを１としたとき、辺Ｌ2の長さが０．７未満で
は半透過型反射体に占める反射膜３部分が少なすぎて、
反射光を有効に利用できないからである。逆に、辺Ｌ2
の長さが２を超えると、半透過型反射体に占める反射膜
３部分が多すぎて、バックライトの光が反射膜３に遮ら
れ過ぎるので透過光を有効に利用できないからである。FIG. 2 is an enlarged view of a triangular section of the ridge of the transflective reflector of the present invention. In the transflective reflector of the present invention, the length L2 of the side of the triangle on the side where the reflection film is provided is the length L2 of the side of the triangle on the side where the reflection film is provided, relative to the length L1 of the side of the triangle on the side where the light is transmitted. The ratio (L1 to L2) is 1: 0.
It is preferably 7 to 1: 2. The reason is that when the length of the side L1 is set to 1, if the length of the side L2 is less than 0.7, the portion of the reflective film 3 occupying the transflective reflector is too small,
This is because the reflected light cannot be used effectively. Conversely, side L2
If the length exceeds 2, the reflective film 3 occupies too much of the semi-transmissive reflector, and the light from the backlight is blocked too much by the reflective film 3 so that the transmitted light cannot be used effectively.
【００１１】また、本発明の半透過型反射体において
は、その表面に設けられた断面三角形の頂点を通る垂線
Ｈと、反射膜３が設けられた側の突条の断面三角形の辺
とのなす角度θが２０度ないし７０度であることが好ま
しい。その理由は、角度θが２０度未満であると反射面
が垂直に近づきすぎ、この半透過型反射体を使用して液
晶表示装置を作成した際に、反射光の反射角度が液晶表
示装置の表示面に対して平行に近くなり、反射光を有効
に利用できないからである。逆に、角度θが７０度を超
えると、透過光で液晶表示装置を見る場合、やはり表示
面に対して平行に近くなるため、前記素子の視野角依存
性の観点から表示が見づらくなるからである。すなわ
ち、透過光を有効利用するには、表示面積に対する反射
膜面積をできるだけ小さくすることが望ましく、反射膜
の設けられた面と平行に近い状態で見る必要があるの
で、視野角が狭くなるという問題があるからである。In the semi-transmissive reflector according to the present invention, the perpendicular H passing through the apex of the triangular cross section provided on the surface thereof and the side of the triangular cross section of the ridge on the side where the reflective film 3 is provided are provided. It is preferable that the angle θ is 20 degrees to 70 degrees. The reason is that if the angle θ is less than 20 degrees, the reflection surface becomes too close to vertical, and when a liquid crystal display device is manufactured using this transflective reflector, the reflection angle of the reflected light is smaller than that of the liquid crystal display device. This is because the light is almost parallel to the display surface, and the reflected light cannot be used effectively. Conversely, if the angle θ exceeds 70 degrees, when viewing the liquid crystal display device with transmitted light, the display device is also close to being parallel to the display surface, making it difficult to view the display from the viewpoint of the viewing angle dependence of the element. is there. That is, in order to make effective use of transmitted light, it is desirable to reduce the area of the reflective film with respect to the display area as much as possible, and it is necessary to view the reflective film in a state nearly parallel to the surface on which the reflective film is provided. Because there is a problem.
【００１２】本発明の半透過型反射体においては、光が
透過する側の突条の断面三角形の辺の長さＬ1が２０μ
ｍないし２００μｍの範囲にあることが好ましい。その
理由は、１ドットの長さに対して辺の長さＬ1が長すぎ
ると、透過光による表示が粗くなるからであり、逆に短
すぎると、光の干渉により着色してしまうからである。
また、半透過型反射体１の表面に設けられた断面三角
形の頂点から、半透過型反射体１の裏面までの距離（以
下、これを厚さという）は、５０μｍないし５００μｍ
の範囲にあることが好ましく、１００μｍないし３００
μｍの範囲にあることがより好ましい。その理由は、半
透過型反射体１の厚さが薄すぎると断面三角形の高さが
低くなり、その結果断面三角形ピッチが狭くなることか
ら光の干渉による着色が観察されるからであり、厚すぎ
ると断面三角形の高さが高くなり、その結果ピッチが広
くなり表示が粗くなるからである。In the transflective reflector of the present invention, the length L1 of the triangular cross section of the ridge on the light transmitting side is 20 μm.
It is preferably in the range of m to 200 μm. The reason is that if the length L1 of the side is too long with respect to the length of one dot, the display by transmitted light will be coarse, and if it is too short, it will be colored by light interference. .
The distance from the apex of the triangular cross section provided on the front surface of the transflective reflector 1 to the back surface of the transflective reflector 1 (hereinafter referred to as the thickness) is 50 μm to 500 μm.
Is preferably in the range of 100 μm to 300 μm.
More preferably, it is in the range of μm. The reason is that if the thickness of the transflective reflector 1 is too thin, the height of the triangular cross section decreases, and as a result, the pitch of the triangular cross section becomes narrow, so that coloring due to light interference is observed. If the distance is too large, the height of the triangular section becomes high, and as a result, the pitch becomes wide and the display becomes rough.
【００１３】次に、本発明に好適に用いられる半透過型
反射体１を製造する工程の一例について説明する。ま
ず、アクリル樹脂やポリカーボネートをモールド成型ま
たはプレス成型することで、表面に断面形状が三角形の
多数の透光性突条が連設されたフィルムを作製する。次
に、反射膜を前記断面形状が三角形の多数の透光性突条
の同じ側に傾斜する斜面にのみ成膜されるよう斜めから
低温蒸着することで、半透過型反射体１を製造すること
ができる。あるいは前記フィルムの表面にレジストを成
膜した後、フォトリソグラフィーでレジストをパターニ
ングしておき、そこへ金属膜を蒸着する、または金属溶
液を塗布した後焼成することで反射膜を形成し、レジス
トを剥離することで半透過型反射体１を製造することが
できる。Next, an example of a process for manufacturing the transflective reflector 1 suitably used in the present invention will be described. First, an acrylic resin or polycarbonate is molded or press-molded to form a film having a large number of light-transmitting ridges having a triangular cross-section on the surface. Next, the transflective body 1 is manufactured by obliquely depositing a reflective film at a low temperature so that the reflective film is formed only on the slope inclined on the same side of the plurality of triangular light-transmitting ridges. be able to. Alternatively, after forming a resist on the surface of the film, the resist is patterned by photolithography, a metal film is deposited thereon, or a metal solution is applied, and then baked to form a reflective film. By peeling off, the transflective reflector 1 can be manufactured.
【００１４】次に、本発明に係る半透過型反射体を用い
たＴＦＴ方式の液晶表示装置について説明する。図３
は、本発明に係る液晶表示装置の一実施形態例を示す断
面図である。図３に示すように、表示側ガラス基板１１
の上面側にポリカーボネートやポリアリレート樹脂など
からなる一枚の位相差板１４を設け、さらに位相差板１
４の上面側に第１の偏光板１５を配設している。背面側
ガラス基板１２の下面側には、第２の偏光板１６、半透
過型反射体１、散乱板１７、バックライト１８が順次設
けられている。半透過型反射体１は、第２の偏光板１６
の下面側に反射膜３を対向させて積層され、第２の偏光
板１６と半透過型反射体１の間には、凹凸を平坦化して
保護する保護膜１９が設けられている。表示側ガラス基
板１１と背面側ガラス基板１２の対向面側には、ＩＴＯ
（インジウムスズ酸化物）などからなる透明電極層２
０、２１がそれぞれ形成され、透明電極層２０、２１上
にポリイミド樹脂などからなる配向膜２２、２３が設け
られている。そして、表示側ガラス基板１１、背面側ガ
ラス基板１２それぞれの配向膜２２、２３の間に液晶層
１３が封入されている。Next, a TFT type liquid crystal display device using a transflective reflector according to the present invention will be described. FIG.
1 is a cross-sectional view showing one embodiment of a liquid crystal display device according to the present invention. As shown in FIG. 3, the display-side glass substrate 11
A single retardation plate 14 made of polycarbonate, polyarylate resin, or the like is provided on the upper surface of the
The first polarizing plate 15 is disposed on the upper surface side of the fourth polarizing plate 4. On the lower surface side of the rear glass substrate 12, a second polarizing plate 16, a transflective reflector 1, a scattering plate 17, and a backlight 18 are sequentially provided. The transflective reflector 1 includes a second polarizing plate 16.
A protective film 19 is provided between the second polarizing plate 16 and the semi-transmissive reflector 1 so as to flatten and protect the irregularities. On the opposing surface side of the display side glass substrate 11 and the back side glass substrate 12, ITO
(Indium tin oxide) transparent electrode layer 2
On the transparent electrode layers 20 and 21, alignment films 22 and 23 made of a polyimide resin or the like are provided. The liquid crystal layer 13 is sealed between the alignment films 22 and 23 of the display-side glass substrate 11 and the rear-side glass substrate 12, respectively.
【００１５】ＴＦＴ方式の液晶表示装置においては、背
面側ガラス基板１２上に薄膜トランジスタ（ＴＦＴ）３
０が設けられている。図３中、符号３１はソース電極、
３２はドレイン電極、３３はゲート電極、３４はｎ+ア
モルファスシリコン、３５はアモルファスシリコン、３
６はＳｉＯ2などからなる絶縁層、３７はＳｉ窒化膜で
ある。In a TFT type liquid crystal display device, a thin film transistor (TFT) 3
0 is provided. In FIG. 3, reference numeral 31 denotes a source electrode,
32 is a drain electrode, 33 is a gate electrode, 34 is n + amorphous silicon, 35 is amorphous silicon,
Reference numeral 6 denotes an insulating layer made of SiO 2 or the like, and 37 denotes an Si nitride film.
【００１６】本実施の形態の液晶表示装置は、周囲が十
分に明るい場合は外光を利用して反射型液晶表示装置と
して使用することができ、周囲の明るさが不十分な場合
はバックライトを点灯させ透過型液晶表示装置として使
用することができる。すなわち、本実施の形態の液晶表
示装置は、半透過型反射体を備えたことで反射型と透過
型の利点を合わせ持ち、バックライトの透過光および外
光の反射光を有効に利用できるので、高表示品位を維持
しつつ低消費電力化を図ることができる。The liquid crystal display device of the present embodiment can be used as a reflective liquid crystal display device using external light when the surroundings are sufficiently bright, and can be used as a backlight when the surrounding brightness is insufficient. Is turned on to be used as a transmission type liquid crystal display device. That is, the liquid crystal display device of the present embodiment has the advantages of the reflective type and the transmissive type by including the transflective reflector, and can effectively use the transmitted light of the backlight and the reflected light of the external light. In addition, low power consumption can be achieved while maintaining high display quality.
【００１７】上述の液晶表示装置についての実施形態
は、ＴＦＴ方式の液晶表示装置について示したが、本発
明に係る液晶表示装置においてはＳＴＮ方式の液晶表示
装置であってもよい。その実施の形態例を図４に示す。
図４中、図３に示した部材と同一の部材には同一の符号
を付し、その説明を省略する。図４において、背面側ガ
ラス基板１２の下面には、第２の偏光板１６、半透過型
反射体１、散乱板１７、バックライト１８が順次設けら
れている。この場合、第２の偏光板１６と半透過型反射
体１の間には保護層は設けられていない。本実施の形態
の液晶表示装置も、反射型と透過型の利点を合わせ持
ち、バックライトの透過光および外光の反射光を有効に
利用できるので、高表示品位を維持しつつ低消費電力化
を図ることができる。Although the above embodiment of the liquid crystal display device has been described with reference to a TFT type liquid crystal display device, the liquid crystal display device according to the present invention may be an STN type liquid crystal display device. FIG. 4 shows an embodiment thereof.
4, the same members as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 4, a second polarizing plate 16, a semi-transmissive reflector 1, a scattering plate 17, and a backlight 18 are sequentially provided on the lower surface of the rear glass substrate 12. In this case, no protective layer is provided between the second polarizing plate 16 and the semi-transmissive reflector 1. The liquid crystal display device of the present embodiment also has the advantages of the reflective type and the transmissive type, and can effectively use the transmitted light of the backlight and the reflected light of the external light, thereby reducing power consumption while maintaining high display quality. Can be achieved.
【００１８】[0018]
【実施例】以下、本発明を実施例により具体的に説明す
るが、本発明はこれらの実施例のみに限定されるもので
はない。 （実施例１）光が透過する側の突条の断面三角形の辺の
長さを８０μｍ、反射膜が設けられた側の突条の断面三
角形の辺の長さを１５２μｍ、光が透過する側の突条の
断面三角形の辺と、反射膜が設けられた側の突条の断面
三角形の辺とのなす角度を１４２度、全体の厚さを３０
０μｍとした半透過型反射体を作製した。 （実施例２）光が透過する側の突条の断面三角形の辺の
長さを１００μｍ、反射膜が設けられた側の突条の断面
三角形の辺の長さを１６０μｍ、光が透過する側の突条
の断面三角形の辺と、反射膜が設けられた側の突条の断
面三角形の辺とのなす角度を１２２度、全体の厚さを３
００μｍとした半透過型反射体を作製した。EXAMPLES Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples. (Example 1) The length of the side of the triangular cross section of the ridge on the light transmitting side is 80 μm, the length of the side of the triangular cross section of the ridge on the side provided with the reflective film is 152 μm, and the side on which the light transmits. The angle between the side of the triangular section of the ridge and the side of the triangular section of the ridge on the side where the reflective film is provided is 142 degrees, and the total thickness is 30.
A transflective reflector having a thickness of 0 μm was produced. (Example 2) The length of the side of the triangular section of the ridge on the light transmitting side is 100 μm, the length of the side of the triangular section of the ridge on the side provided with the reflective film is 160 μm, and the side on which the light transmits. The angle between the side of the triangular cross section of the ridge and the side of the triangular cross section of the ridge on the side where the reflective film is provided is 122 degrees, and the total thickness is 3 degrees.
A transflective reflector having a thickness of 00 μm was produced.
【００１９】（実施例３）光が透過する側の突条の断面
三角形の辺の長さを１５０μｍ、反射膜が設けられた側
の突条の断面三角形の辺の長さを１５０μｍ、光が透過
する側の突条の断面三角形の辺と、反射膜が設けられた
側の突条の断面三角形の辺とのなす角度を９６度、全体
の厚さを３００μｍとした半透過型反射体を作製した。 （実施例４）光が透過する側の突条の断面三角形の辺の
長さを１５０μｍ、反射膜が設けられた側の突条の断面
三角形の辺の長さを１００μｍ、光が透過する側の突条
の断面三角形の辺と、反射膜が設けられた側の突条の断
面三角形の辺とのなす角度を１１０度、全体の厚さを３
００μｍとした半透過型反射体を作製した。これらの反
射膜をＴＦＴ型液晶表示装置に組み込み、反射型液晶表
示装置、透過型液晶表示装置としてそれぞれ見たときの
明るさについて、非常に明るく見やすい「Ａ」、明るく
見やすい「Ｂ」、やや暗い「Ｃ」、明るさは不十分だが
表示の視認は可能な「Ｄ」までの４段階に分類し評価を
行った。結果を表１に示す。(Example 3) The length of the side of the triangular cross section of the ridge on the side where light is transmitted is 150 μm, the length of the side of the triangular cross section of the ridge on the side where the reflective film is provided is 150 μm, and light is transmitted. A semi-transmissive reflector having an angle of 96 degrees between the side of the triangular cross section of the ridge on the transmitting side and the side of the triangular cross section of the ridge on the side provided with the reflective film, and having an overall thickness of 300 μm is used. Produced. (Example 4) The length of the side of the triangular cross section of the ridge on the light transmitting side is 150 μm, the length of the side of the triangular cross section of the ridge on the side provided with the reflective film is 100 μm, and the side on which the light transmits. The angle between the side of the triangular section of the ridge and the side of the triangular section of the ridge on the side provided with the reflective film is 110 degrees, and the total thickness is 3 degrees.
A transflective reflector having a thickness of 00 μm was produced. These reflective films are incorporated into a TFT type liquid crystal display device, and when viewed as a reflection type liquid crystal display device and a transmission type liquid crystal display device, respectively, the brightness is very bright and easy to see “A”, bright and easy to see “B”, and slightly dark. The evaluation was performed by classifying the data into four grades up to “C” and “D” where the brightness was insufficient but the display could be visually recognized. Table 1 shows the results.
【００２０】[0020]
【表１】 [Table 1]
【００２１】実施例１の半透過型反射体は、反射面の面
積が大きいため反射型としては評価Ａであったが、バッ
クライトの光が遮られ過ぎて光量が不足したため、透過
型としては評価Ｄであった。逆に、実施例４の半透過型
反射体は、反射面の面積が小さいため透過型としては評
価Ａであったが、反射面の面積の不足のため反射光の光
量が足りず、反射型としては評価Ｄであった。実施例２
および実施例３の半透過型反射体は、反射型、透過型と
して、ともにある程度の明るさを有していた。特に、実
施例２の半透過型反射体は、反射型、透過型とも評価Ｂ
となっており、明るさのバランスに優れていた。The semi-transmissive reflector of Example 1 was rated A as a reflective type because of the large area of the reflective surface. However, the amount of light was insufficient because the light from the backlight was blocked too much. The evaluation was D. Conversely, the transflective reflector of Example 4 was evaluated as a transmissive type because the area of the reflective surface was small, but the amount of reflected light was insufficient due to the insufficient area of the reflective surface, and the reflective type Was evaluated as D. Example 2
In addition, the transflective reflector of Example 3 was of a reflective type and a transmissive type, and both had a certain level of brightness. In particular, the semi-transmissive reflector of Example 2 was evaluated for both reflective and transmissive types.
It was excellent in the balance of brightness.
【００２２】[0022]
【発明の効果】上述のごとく、本発明の半透過性反射体
は、光を透過する基体の表面に、断面形状が三角形の多
数の透光性突条が連設され、各突条の同じ側に傾斜する
斜面にのみ反射膜が設けられ、他の側の斜面には光が透
過することを特徴としており、反射膜が外光を反射する
と同時に、反射膜が設けられている部分以外はバックラ
イトの光を透過するので、反射光と透過光を効率的に利
用することができる。As described above, in the translucent reflector of the present invention, a large number of translucent ridges having a triangular cross-section are continuously provided on the surface of a substrate that transmits light, and The reflection film is provided only on the slope inclined to the side, and light is transmitted on the other slope, and at the same time as the reflection film reflects external light, except for the portion where the reflection film is provided. Since the light of the backlight is transmitted, the reflected light and the transmitted light can be used efficiently.
【００２３】また、本発明の半透過型反射体は、光が透
過する側の突条の断面三角形の辺の長さに対する、反射
膜が設けられた側の前記突条の断面三角形の辺の長さの
割合が１対０．７ないし１対２であり、かつ断面三角形
の頂点を通る垂線と反射膜が設けられた側の断面三角形
の辺とのなす角度が２０度ないし７０度であることを特
徴としており、光が反射する部分と光が透過する部分を
バランスよく合わせ持つようになっている。また、本発
明の半透過型反射体を有する液晶表示装置は、反射型と
透過型の利点を合わせ持ち、バックライトの透過光およ
び外光の反射光を有効に利用できるので、消費電力を必
要以上に増大することなく、周囲の明るさによらずに表
示の視認が可能であり、高表示品位を維持しつつ低消費
電力化を図ることができる。The semi-transmissive reflector according to the present invention is characterized in that the length of the side of the triangular section of the ridge on the side where the reflection film is provided relative to the length of the side of the triangular section of the ridge on the side through which light is transmitted. The length ratio is 1: 0.7 to 1: 2, and the angle between the perpendicular passing through the vertex of the cross-sectional triangle and the side of the cross-sectional triangle on the side where the reflective film is provided is 20 to 70 degrees. It is characterized by having a light reflecting portion and a light transmitting portion in a well-balanced manner. Further, the liquid crystal display device having the transflective reflector of the present invention has both the advantages of the reflective type and the transmissive type, and can effectively use the transmitted light of the backlight and the reflected light of the external light. Without the above increase, the display can be visually recognized regardless of the surrounding brightness, and low power consumption can be achieved while maintaining high display quality.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 本発明の半透過型反射体の一例を示す部分拡
大図である。FIG. 1 is a partially enlarged view showing an example of a transflective reflector of the present invention.
【図２】 本発明の半透過型反射体の突条の断面三角形
部分の拡大図である。FIG. 2 is an enlarged view of a triangular section of a ridge of the transflective reflector of the present invention.
【図３】 本発明に係る液晶表示装置の一実施形態例を
示す断面図である。FIG. 3 is a sectional view showing an embodiment of the liquid crystal display device according to the present invention.
【図４】 本発明に係る液晶表示装置の他の実施形態例
を示す断面図である。FIG. 4 is a sectional view showing another embodiment of the liquid crystal display device according to the present invention.
１ 半透過型反射体 ２ プリズムシート（光を透過する基体） ３ 反射膜 DESCRIPTION OF SYMBOLS 1 Transflective reflector 2 Prism sheet (substrate which transmits light) 3 Reflective film
Claims (3)
三角形の多数の透光性突条が連設され、該各突条の同じ
側に傾斜する斜面にのみ反射膜が設けられ、他の側の斜
面には光が透過することを特徴とする半透過型反射体。1. A plurality of light-transmitting ridges having a triangular cross-section are continuously provided on a surface of a substrate that transmits light, and a reflection film is provided only on a slope inclined on the same side of each of the ridges. A transflective reflector characterized in that light is transmitted on the other slope.
の辺の長さに対する、前記反射膜が設けられた側の前記
突条の断面三角形の辺の長さの割合が１対０．７ないし
１対２であり、かつ前記断面三角形の頂点を通る垂線と
反射膜が設けられた側の断面三角形の前記辺とのなす角
度が２０度ないし７０度であることを特徴とする請求項
１記載の半透過型反射体。2. The ratio of the length of the side of the triangular cross section of the ridge on the side where the reflection film is provided to the length of the side of the triangular cross section of the ridge on the side through which light is transmitted is 1: 0. 0.7 to 1: 2, and the angle formed by the perpendicular passing through the apex of the sectional triangle and the side of the sectional triangle on the side where the reflective film is provided is 20 to 70 degrees. Item 4. The transflective reflector according to Item 1.
ことを特徴とする液晶表示装置。3. A liquid crystal display device comprising the transflective reflector according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9236289A JPH1184116A (en) | 1997-09-01 | 1997-09-01 | Translucent type reflector and liquid crystal display device using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9236289A JPH1184116A (en) | 1997-09-01 | 1997-09-01 | Translucent type reflector and liquid crystal display device using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1184116A true JPH1184116A (en) | 1999-03-26 |
Family
ID=16998594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9236289A Withdrawn JPH1184116A (en) | 1997-09-01 | 1997-09-01 | Translucent type reflector and liquid crystal display device using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1184116A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020093604A1 (en) * | 2000-12-27 | 2002-07-18 | Masaji Shinjo | Light reflector and a liquid crystal display device |
| JP2002333621A (en) * | 2001-05-11 | 2002-11-22 | Dainippon Printing Co Ltd | Transflective liquid crystal display device and method of manufacturing transflective plate used therein |
-
1997
- 1997-09-01 JP JP9236289A patent/JPH1184116A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020093604A1 (en) * | 2000-12-27 | 2002-07-18 | Masaji Shinjo | Light reflector and a liquid crystal display device |
| US6992739B2 (en) * | 2000-12-27 | 2006-01-31 | Koninklijke Philips Electronics N.V. | Light reflector and a liquid crystal display device |
| JP2002333621A (en) * | 2001-05-11 | 2002-11-22 | Dainippon Printing Co Ltd | Transflective liquid crystal display device and method of manufacturing transflective plate used therein |
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