JP2816686B2 - Liquid crystal device - Google Patents
Liquid crystal deviceInfo
- Publication number
- JP2816686B2 JP2816686B2 JP63220486A JP22048688A JP2816686B2 JP 2816686 B2 JP2816686 B2 JP 2816686B2 JP 63220486 A JP63220486 A JP 63220486A JP 22048688 A JP22048688 A JP 22048688A JP 2816686 B2 JP2816686 B2 JP 2816686B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- substrates
- crystal device
- light source
- pair
- 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
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- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、液晶を用いた液晶装置、特に、色むら発生
を抑制した液晶装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal device using a liquid crystal, and in particular, to a liquid crystal device in which color unevenness is suppressed.
［従来の技術］ クラークとラガーウオルは、Applied Physics Letter
s第36巻、第11号（1980年６月１日発行）P.899〜901、
または米国特許第4367924号、米国特許第4563059号で、
表面安定化強誘電性液晶（Surface−stabilized farroe
lectric liquid crystal）による双安定性強誘電性液晶
を明らかにした。この双安定性強誘電性液晶は、バルク
状態のカイラルスメクチック相における液晶分子のらせ
ん配列構造の形成を抑制するのに十分に小さい間隔に設
定した一対の基板間に配置させ、かつ複数の液晶分子で
組織された垂直分子層を一方向に配列させることによっ
て実現された。[Prior art] Clark and Lagerwohl, Applied Physics Letter
s Volume 36, Issue 11 (June 1, 1980) P.899-901,
Or in U.S. Patent No. 4367924, U.S. Patent No.
Surface-stabilized farroe
Bistable ferroelectric liquid crystal was revealed by using electric liquid crystal. This bistable ferroelectric liquid crystal is disposed between a pair of substrates set at a distance small enough to suppress the formation of a helical arrangement of liquid crystal molecules in a chiral smectic phase in a bulk state, and a plurality of liquid crystal molecules are disposed. This was realized by arranging the vertical molecular layers organized in a unidirectional manner.
しかし、実際の強誘電性液晶セルの透明率は、充分に
大きなものではなく、そのため表示を行なうときには高
輝度の背面光源を用いる必要があった。そして一般に、
このような高輝度の光源としては、シャープな比エネル
ギ（％）のピークを生じる光源、特に発光波長が異なる
少なくとも２種の蛍光体を用いた蛍光体光源（例えば、
第３図に示すような特性を有する、東芝社製「FL40SS−
EEX37−Ｓ」）が知られている。However, the transparency of the actual ferroelectric liquid crystal cell is not sufficiently high, and therefore, it is necessary to use a high-luminance back light source when performing display. And in general,
As such a high-luminance light source, a light source that generates a sharp peak of specific energy (%), particularly a phosphor light source using at least two phosphors having different emission wavelengths (for example,
The "FL40SS-" made by Toshiba Corporation has the characteristics shown in Fig. 3.
EEX37-S ") is known.
［発明が解決しようとする課題］ しかしながら、このような光源を前述した強誘電性液
晶パネル（セル）の背面光源として利用すると、液晶層
の膜厚むらに由来する色むらが発生したり、観察方向の
変化に応じてパネル全面での色合に変化を生じるなどの
問題点を惹き起していた。[Problems to be Solved by the Invention] However, when such a light source is used as a back light source of the above-described ferroelectric liquid crystal panel (cell), color unevenness due to uneven film thickness of the liquid crystal layer occurs, This causes problems such as a change in the color tone of the entire panel according to the change in the direction.
本発明の目的は、この従来技術の問題点に鑑み、明る
い表示状態を損なうことなく、色むらの発生および色合
の変化を防止した液晶装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal device in which the occurrence of color unevenness and a change in color are prevented without impairing a bright display state in view of the problems of the related art.
［課題を解決するための手段］ 上記目的を達成するため本発明では、一対の基板とこ
れらの間に挟持された厚さ５μｍ以下の液晶層とを有す
る液晶セル、および発光波長が異なる少なくとも２種の
蛍光体を有する蛍光灯光源を備えた液晶装置において、
該一対の基板は、それぞれが有するガラス基板の屈折率
を互いに異ならせて該一対の基板の光路長が異なるよう
にしている。Means for Solving the Problems To achieve the above object, according to the present invention, a liquid crystal cell having a pair of substrates and a liquid crystal layer having a thickness of 5 μm or less sandwiched between the substrates, and at least two liquid crystals having different emission wavelengths. In a liquid crystal device provided with a fluorescent light source having a kind of phosphor,
The pair of substrates have different refractive indices of the respective glass substrates so that the pair of substrates have different optical path lengths.
［作用］ この構成において、光源から液晶セルに入射し、双方
の基板で多重反射した光は、双方の光路差により、相互
に干渉しにくくなり、色むらや色合の変化が従来の場合
より抑制されたディスプレイが行なわれる。[Operation] In this configuration, the light that enters the liquid crystal cell from the light source and is multiply reflected by both substrates is less likely to interfere with each other due to the optical path difference between the two, and color unevenness and change in color are suppressed as compared with the conventional case. The displayed display is performed.
［実施例］ 以下、図面を用いて本発明の実施例を説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明の一実施例に係る強誘電性液晶装置の
構成を示す模式的な断面図である。同図に示すように、
この液晶装置は、それぞれ厚さが0.7mmおよび1.1mmと異
なりかつそれぞれ粗い表面1aおよび1b,1cの有する一対
のガラス基板2aと2bおよびこの間に挟持された厚さ５μ
ｍ以下の強誘電性液晶層３を含む強誘電性液晶セル、な
らびに基板2bの背後に設けられた３波長タイプの蛍光灯
光源４を備える。ただし、ガラス基板2aおよび2bは双方
とも1.51の屈折率を有する。FIG. 1 is a schematic sectional view showing the configuration of a ferroelectric liquid crystal device according to one embodiment of the present invention. As shown in the figure,
This liquid crystal device has a pair of glass substrates 2a and 2b having different thicknesses of 0.7 mm and 1.1 mm and having rough surfaces 1a, 1b, and 1c, respectively, and a thickness of 5 μm sandwiched between the substrates.
A ferroelectric liquid crystal cell including a ferroelectric liquid crystal layer 3 of m or less, and a three-wavelength type fluorescent lamp light source 4 provided behind a substrate 2b. However, both the glass substrates 2a and 2b have a refractive index of 1.51.
また、ガラス基板2aおよび2bは、それぞれ強誘電性液
晶の配向を制御するための透明導電体を形成しているIT
O（インシウム・ティン・オキサイド）層5aおよび5b、
絶縁層としてのSiO2層6aおよび6b、強誘電性液晶層３に
接する配向膜7aおよび7bを備える。In addition, the glass substrates 2a and 2b each form a transparent conductor for controlling the orientation of the ferroelectric liquid crystal.
O (Indium Tin Oxide) layers 5a and 5b,
It has SiO 2 layers 6a and 6b as insulating layers, and alignment films 7a and 7b in contact with the ferroelectric liquid crystal layer 3.
粗い表面1aおよび1bは、ガラス基板2aおよび2bの表面
を物理的あるいは化学的手段によって粗くした面であ
る。The rough surfaces 1a and 1b are surfaces obtained by roughening the surfaces of the glass substrates 2a and 2b by physical or chemical means.
また、基板2bはさらにカラーフィルタ８およびパッシ
ベーション層９を備え、光源４はその発する光を液晶セ
ル方向に反射する反射板10を備える。液晶セルの両側に
は偏光板11aおよび11bを備える。The substrate 2b further includes a color filter 8 and a passivation layer 9, and the light source 4 includes a reflector 10 that reflects light emitted from the light source 4 in the direction of the liquid crystal cell. Polarizing plates 11a and 11b are provided on both sides of the liquid crystal cell.
このような構成の強誘電性液晶セルにおいては、強誘
電性液晶層３の厚さが１〜５μｍと非常に薄いため、外
側のガラス基板面（ガラスと空気との境界面）の間を往
復する光の干渉も問題となりやすい。しかし本実施例に
おいては、ガラス基板2aおよび2bを通過する光路の光波
長は、例えば、第２図に示す光路Ａおよび光路Ｂのよう
に光路長が0.4mm以上となるため、上述の干渉が発生し
にくくなる。したがって、色むらの発生や色合いの変化
がいっそう抑制され、表示品位の優れたFLC（強誘電性
液晶）ディスプレイが行なわれる。In the ferroelectric liquid crystal cell having such a configuration, since the thickness of the ferroelectric liquid crystal layer 3 is very thin, 1 to 5 μm, the ferroelectric liquid crystal layer reciprocates between the outer glass substrate surfaces (the boundary surface between glass and air). Light interference is also a problem. However, in this embodiment, the optical wavelength of the optical path passing through the glass substrates 2a and 2b is, for example, 0.4 mm or more as in the optical paths A and B shown in FIG. Less likely to occur. Therefore, the occurrence of color unevenness and a change in color tone are further suppressed, and an FLC (ferroelectric liquid crystal) display with excellent display quality is performed.
なお、ここでは、ガラス基板2aおよび2bの厚さを異な
ったものとしているが、この代りに屈折率が異なるよう
にしてもよい。光路長はΔnd（但し、Δｎは材料屈折
率、ｄはガラス基板の厚みである）であり、Δｎを異な
らせることにより、両基板の光路長を異ならせることが
できる。本発明者らは、この原理に基づいて両基板で屈
折率Δｎを変化せしめ、両基板を通過する光の光路長の
関係を調整して干渉を防止し、色むらや色合いの変化を
抑制することができた。Although the thicknesses of the glass substrates 2a and 2b are different here, the refractive indices may be different instead. The optical path length is Δnd (where Δn is the refractive index of the material, and d is the thickness of the glass substrate). By making Δn different, the optical path lengths of the two substrates can be made different. The present inventors change the refractive index Δn on both substrates based on this principle, adjust the relationship of the optical path length of light passing through both substrates, prevent interference, and suppress color unevenness and change in color tone. I was able to.
［発明の効果］ 以上説明したように本発明によれば、液晶装置におい
て、高輝度の複数波長の光源を背面光源としてディスプ
レイする場合でも、色むらの発生や色合の変化を抑制す
ることができる。[Effects of the Invention] As described above, according to the present invention, in a liquid crystal device, even when a high-luminance light source having a plurality of wavelengths is displayed as a back light source, it is possible to suppress the occurrence of color unevenness and a change in color tone. .
第１図は、本発明の一実施例に係る強誘電性液晶装置の
構成を示す模式的な断面図、 第２図は、第１図の装置における光路長の変化のようす
を示す模式図、そして 第３図は、強誘電性液晶装置の背面光源として用いられ
る蛍光体光源の特性の一例を示すグラフである。 1a,1b,1c:粗い表面、 2a,2b:基板、 3:強誘電性液晶層、 4:光源、 5a,5b:ITO層、 6a,6b:SiO2層、 7a,7b:配向膜、 8:カラーフィルタ、 9:パッシベーション層、 10:反射膜、 11a,11b:偏光板。FIG. 1 is a schematic cross-sectional view showing a configuration of a ferroelectric liquid crystal device according to one embodiment of the present invention. FIG. 2 is a schematic diagram showing how an optical path length changes in the device of FIG. FIG. 3 is a graph showing an example of characteristics of a phosphor light source used as a back light source of a ferroelectric liquid crystal device. 1a, 1b, 1c: rough surface, 2a, 2b: substrate, 3: ferroelectric liquid crystal layer, 4: light source, 5a, 5b: ITO layer, 6a, 6b: SiO 2 layer, 7a, 7b: alignment film, 8 : Color filter, 9: passivation layer, 10: reflective film, 11a, 11b: polarizing plate.
フロントページの続き (56)参考文献 特開 昭59−140421（ＪＰ，Ａ) 特開 昭61−143789（ＪＰ，Ａ) 特開 昭63−116121（ＪＰ，Ａ) 特開 平２−13926（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G02F 1/1333 G02F 1/1335 G02F 1/137 G02F 1/133 500 G09F 9/30Continuation of front page (56) References JP-A-59-140421 (JP, A) JP-A-61-143789 (JP, A) JP-A-63-116121 (JP, A) JP-A-2-13926 (JP) , A) (58) Field surveyed (Int.Cl. 6 , DB name) G02F 1/1333 G02F 1/1335 G02F 1/137 G02F 1/133 500 G09F 9/30
Claims (2)
５μｍ以下の液晶層とを有する液晶セル、および発光波
長が異なる少なくとも２種の蛍光体を有する蛍光灯光源
を備えた液晶装置において、該一対の基板はそれぞれガ
ラス基板を備え、双方のガラス基板は互いに屈折率が異
なり、これにより該一対の基板は互いに光路長が異なる
ことを特徴とする液晶装置。1. A liquid crystal device comprising: a liquid crystal cell having a pair of substrates and a liquid crystal layer having a thickness of 5 μm or less sandwiched between the substrates; and a fluorescent lamp light source having at least two kinds of phosphors having different emission wavelengths. In the liquid crystal device, the pair of substrates each include a glass substrate, and the two glass substrates have different refractive indices, so that the pair of substrates have different optical path lengths.
載の液晶装置。2. The liquid crystal device according to claim 1, wherein said liquid crystal is a ferroelectric liquid crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63220486A JP2816686B2 (en) | 1988-09-05 | 1988-09-05 | Liquid crystal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63220486A JP2816686B2 (en) | 1988-09-05 | 1988-09-05 | Liquid crystal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0268518A JPH0268518A (en) | 1990-03-08 |
| JP2816686B2 true JP2816686B2 (en) | 1998-10-27 |
Family
ID=16751830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63220486A Expired - Fee Related JP2816686B2 (en) | 1988-09-05 | 1988-09-05 | Liquid crystal device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2816686B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1284398B1 (en) * | 1994-01-17 | 1998-05-18 | Adelfio Zanoni | OBJECT OBTAINED THROUGH THE COATING OF TRANSPARENT MATERIALS THROUGH INTERFERENTIAL DEPOSITS |
-
1988
- 1988-09-05 JP JP63220486A patent/JP2816686B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0268518A (en) | 1990-03-08 |
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