JPH1138380A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
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- JPH1138380A JPH1138380A JP9203918A JP20391897A JPH1138380A JP H1138380 A JPH1138380 A JP H1138380A JP 9203918 A JP9203918 A JP 9203918A JP 20391897 A JP20391897 A JP 20391897A JP H1138380 A JPH1138380 A JP H1138380A
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- Prior art keywords
- liquid crystal
- light transmittance
- display device
- region
- voltage
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶表示装置に関
し、特に高分子分散型液晶を用いた液晶表示装置に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display using a polymer dispersed liquid crystal.
【０００２】[0002]
【従来の技術】高分子分散型液晶による液晶表示装置
は、高分子樹脂と液晶を分散させて形成した液晶表示素
子を用い、印加電圧により光の透過・不透過を制御して
所定の表示を行うものとして公知である。ここで、高分
子分散型液晶は、電圧を印加したとき、光透過性とな
る。2. Description of the Related Art A liquid crystal display device using a polymer dispersed liquid crystal uses a liquid crystal display element formed by dispersing a polymer resin and a liquid crystal, and controls a light transmission / non-transmission by an applied voltage to perform a predetermined display. It is known to do. Here, the polymer dispersed liquid crystal becomes light transmissive when a voltage is applied.
【０００３】[0003]
【発明が解決しようとする課題】高分子分散型液晶を用
いた従来の液晶表示装置において所定の表示をするため
に、表示パターンに対応してガラス基板上に透光性電極
をパターニングした場合、次のような問題が生じる。図
９に示すように、ガラス基板上の全面に高分子分散型液
晶層９１を形成し、この液晶層９１において図９の実線
で示す閉領域９２を表示する場合、領域９２に対応して
図の破線で示すようにパターニングされた透光性電極９
３をガラス基板に形成し、更に電極９３に連続して端子
部９３ａを形成し、この端子部９３ａを介して外部から
電圧を印加する。In a conventional liquid crystal display device using a polymer-dispersed liquid crystal, when a translucent electrode is patterned on a glass substrate in accordance with a display pattern in order to perform a predetermined display, The following problems arise. As shown in FIG. 9, a polymer-dispersed liquid crystal layer 91 is formed on the entire surface of a glass substrate, and a closed region 92 indicated by a solid line in FIG. Transparent electrode 9 patterned as shown by the broken line
3 is formed on a glass substrate, a terminal portion 93a is formed continuously with the electrode 93, and a voltage is externally applied through the terminal portion 93a.
【０００４】図９のように、閉領域９２を表示させる場
合、端子部９３ａから電圧を印加すると、電極９３に対
応する閉領域９２の光透過率が上昇し、閉領域９２の光
透過率が周囲と異なるようになるため、閉領域９２が表
示されるが、このとき同時に端子部９３ａに対応する領
域もその光透過率が変化するため表示されてしまう。こ
のように、高分子分散型液晶を用いた従来の液晶表示装
置において閉領域を表示させようとすると、端子部のよ
うな不要の領域まで表示させてしまい、液晶表示品質上
好ましくない。As shown in FIG. 9, when displaying a closed area 92, when a voltage is applied from a terminal portion 93a, the light transmittance of the closed area 92 corresponding to the electrode 93 increases, and the light transmittance of the closed area 92 decreases. Since the area differs from the surrounding area, the closed area 92 is displayed. At this time, the area corresponding to the terminal portion 93a is also displayed because the light transmittance changes. As described above, when an attempt is made to display a closed region in a conventional liquid crystal display device using a polymer-dispersed liquid crystal, an unnecessary region such as a terminal portion is displayed, which is not preferable in terms of liquid crystal display quality.
【０００５】本発明の目的は、簡単な電極構成で閉領域
を表示することのできる液晶表示装置を提供することで
ある。An object of the present invention is to provide a liquid crystal display device capable of displaying a closed region with a simple electrode configuration.
【０００６】[0006]
【課題を解決するための手段】上記課題の達成のため、
本発明は、光透過率が印加電圧に応じて変化する液晶に
より所定の表示を行う液晶表示装置において、光透過率
と印加電圧とが第１の関係で変化する第１の液晶領域
と、光透過率と印加電圧とが第１の関係と異なる第２の
関係で変化する第２の液晶領域とを有することを特徴と
する。In order to achieve the above object,
The present invention relates to a liquid crystal display device that performs a predetermined display by using a liquid crystal in which light transmittance changes according to an applied voltage, a first liquid crystal region in which the light transmittance and the applied voltage change in a first relationship, It has a second liquid crystal region in which the transmittance and the applied voltage change in a second relationship different from the first relationship.
【０００７】本発明によれば、第１の液晶領域と第２の
液晶領域は光透過率と印加電圧との関係が相違するた
め、印加電圧が所定の状態であるとき、両領域の各光透
過率が異なるため、第１及び第２の液晶領域を区別して
視認できる。これにより、電極を特にパターニングする
ことなく所定の表示を行うことができ、また、電極の端
子部等が表示されてしまう、といった問題は生じない。According to the present invention, since the relationship between the light transmittance and the applied voltage is different between the first liquid crystal region and the second liquid crystal region, when the applied voltage is in a predetermined state, each light in both regions is different. Since the transmittances are different, the first and second liquid crystal regions can be visually recognized separately. Thus, a predetermined display can be performed without particularly patterning the electrode, and there is no problem that the terminal portion of the electrode is displayed.
【０００８】また、第１の液晶領域と第２の液晶領域と
の光透過率の差により前記所定の表示を行うとともに、
前記印加電圧を変化させることにより第１の液晶領域と
第２の液晶領域との光透過率を同一または近似させて前
記所定の表示を視認できないように構成できる。The predetermined display is performed based on a difference in light transmittance between the first liquid crystal region and the second liquid crystal region.
By changing the applied voltage, the light transmittance of the first liquid crystal region and the light transmittance of the second liquid crystal region can be made equal or close to each other so that the predetermined display cannot be viewed.
【０００９】これにより、両液晶領域の光透過率の差に
よって所定の表示を行う一方、第１の関係と第２の関係
によって決まる所定の電圧に制御して両光透過率を同一
または近似させることによって、第１及び第２の液晶領
域を区別できなくして視認できないようにする。このよ
うにして、所定の表示を行い、また非表示にできる。Thus, while a predetermined display is performed based on a difference between the light transmittances of the two liquid crystal regions, a predetermined voltage determined by the first relationship and the second relationship is controlled so that the two light transmittances are the same or approximate. This makes the first and second liquid crystal regions indistinguishable and invisible. In this way, a predetermined display can be performed and can be hidden.
【００１０】また、前記各液晶領域は高分子分散型液晶
から構成できる。Each of the liquid crystal regions can be composed of a polymer dispersed liquid crystal.
【００１１】また、第１の液晶領域が前記所定の表示を
行うようパターン化されているとともに、第２の液晶領
域に包囲されているようにできる。第１の液晶領域を任
意のパターンとすることにより、複雑な表示が可能とな
り、また閉領域においても電極の形状によらず表示可能
となる。The first liquid crystal region may be patterned so as to perform the predetermined display, and may be surrounded by the second liquid crystal region. By making the first liquid crystal region an arbitrary pattern, a complicated display becomes possible, and even in a closed region, display becomes possible irrespective of the shape of the electrode.
【００１２】また、第１の液晶領域と第２の液晶領域と
を一対の透光性基板の間に挟み込むように配置でき、こ
れにより、閉領域における所定表示が可能である。Further, the first liquid crystal region and the second liquid crystal region can be arranged so as to be sandwiched between a pair of translucent substrates, whereby predetermined display in a closed region is possible.
【００１３】また、前記各液晶領域に電圧を印可するた
めの透光性電極を前記一対の透光性基板の全面にそれぞ
れ備えさせるようにできる。Also, a light-transmitting electrode for applying a voltage to each of the liquid crystal regions may be provided on the entire surface of the pair of light-transmitting substrates.
【００１４】また、第１の液晶領域と第２の液晶領域と
が一対の透光性基板の間に挟み込まれており、前記各液
晶領域に電圧を印可するための透光性電極を前記一対の
透光性基板にそれぞれ備えさせ、前記透光性電極の少な
くとも一方を前記パターン化された第１の液晶領域に対
応するよう分割して設けるようにできる。Further, a first liquid crystal region and a second liquid crystal region are sandwiched between a pair of translucent substrates, and a translucent electrode for applying a voltage to each of the liquid crystal regions is provided with the pair of translucent electrodes. And at least one of the light-transmitting electrodes may be divided and provided so as to correspond to the patterned first liquid crystal region.
【００１５】これにより、電極を分割して、第１の液晶
領域と第２の液晶領域の各印加電圧を異なるように制御
できるため、例えば各光透過率の差が大きくなるように
して表示の視認性を高めたり、また、任意の光透過率に
おいて視認できなくなるようにすることが可能となる。Thus, the electrodes can be divided and the applied voltages of the first liquid crystal region and the second liquid crystal region can be controlled so as to be different from each other. It is possible to enhance the visibility and make it invisible at an arbitrary light transmittance.
【００１６】[0016]
【発明の実施の形態】以下、本発明による第１〜第３の
実施の形態について図面を用いて説明する。 〈第１の実施の形態〉図１は本発明の第１の実施の形態
による高分子分散型液晶を用いた液晶表示装置の平面図
であり、図２は図１のII−II線断面図、図３は同じくII
I−III線断面図である。図１に示す液晶表示装置１は、
電圧−光透過率特性の異なる高分子分散型液晶１０と１
１とを備え、高分子分散型液晶１１が数字「８８８８」
を表示できるようになっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first to third embodiments of the present invention will be described with reference to the drawings. <First Embodiment> FIG. 1 is a plan view of a liquid crystal display device using a polymer-dispersed liquid crystal according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. , Figure 3 is also II
FIG. 3 is a sectional view taken along line I-III. The liquid crystal display device 1 shown in FIG.
Polymer dispersed liquid crystals 10 and 1 having different voltage-light transmittance characteristics
1 and the polymer-dispersed liquid crystal 11 has the number “8888”
Can be displayed.
【００１７】図２及び図３の断面図に示すように、液晶
表示装置１は、一対のガラス基板１３，１３の間に、高
分子分散型液晶１０，１１が形成されており、その周囲
がシール材１４により封止されている。ガラス基板１
３，１３の各液晶１０，１１に接する側には全面に透光
性電極１２，１２がそれぞれ形成されている。透光性電
極１２，１２は、例えばＩＴＯ（Ｉｎｄｉｕｍ Ｔｉｎ
Ｏｘｉｄｅ）等から蒸着等により形成することができ
る。As shown in the sectional views of FIG. 2 and FIG. 3, the liquid crystal display device 1 has polymer dispersed liquid crystals 10 and 11 formed between a pair of glass substrates 13 and 13, and the periphery thereof is formed. It is sealed by a sealing material 14. Glass substrate 1
Light-transmissive electrodes 12, 12 are formed on the entire surface of the sides of the liquid crystals 10, 11 in contact with the liquid crystals 10, 11, respectively. The translucent electrodes 12, 12 are made of, for example, ITO (Indium Tin).
Oxide) can be formed by vapor deposition or the like.
【００１８】図４に第１の実施の形態における各液晶１
０，１１の印加電圧と光透過率との関係を示す。図４に
示す電圧光透過率特性曲線１０１が液晶１０の特性を、
電圧光透過率曲線１０２が液晶１１の特性をそれぞれ示
している。図４から分かるように、印加電圧がＶ１のと
き、液晶１０の光透過率Ｔ１（Ｖ１）と液晶１１の光透
過率Ｔ２（Ｖ１）とが等しくなり、両液晶１０，１１の
光透過率に差がないため、液晶１１による数字「８８８
８」は視認できない。しかし、印加電圧が低下してＶ２
となると、液晶１０の光透過率Ｔ１（Ｖ２）が液晶１１
の光透過率Ｔ２（Ｖ２）よりも大きくなるため、両液晶
１０，１１の光透過率に差が生じるために、液晶１１に
よる数字「８８８８」を視認できるようになる。印加電
圧がＶのときの光透過率差ＤＴ（Ｖ）は、次の式（１）
により表すことができる。FIG. 4 shows each liquid crystal 1 according to the first embodiment.
The relationship between the applied voltage of 0, 11 and the light transmittance is shown. A voltage light transmittance characteristic curve 101 shown in FIG.
The voltage light transmittance curve 102 shows the characteristics of the liquid crystal 11 respectively. As can be seen from FIG. 4, when the applied voltage is V1, the light transmittance T1 (V1) of the liquid crystal 10 and the light transmittance T2 (V1) of the liquid crystal 11 become equal, and the light transmittance of both liquid crystals 10 and 11 becomes smaller. Since there is no difference, the numeral “888”
8 "is not visible. However, the applied voltage decreases and V2
When the light transmittance T1 (V2) of the liquid crystal 10 is
Is larger than the light transmittance T2 (V2) of the liquid crystal 11, and a difference occurs between the light transmittances of the two liquid crystals 10 and 11, so that the numeral “8888” by the liquid crystal 11 can be visually recognized. The light transmittance difference DT (V) when the applied voltage is V is given by the following equation (1).
Can be represented by
【００１９】 ＤＴ（Ｖ）＝ａｂｓ（Ｔ１（Ｖ）−Ｔ２（Ｖ）） （１） ここで、ａｂｓ（ ）は絶対値を求める関数、Ｔ１
（Ｖ）は液晶１０の印加電圧がＶであるときの光透過
率、Ｔ２（Ｖ）は液晶１１の印加電圧が同じくＶである
ときの光透過率である。DT (V) = abs (T1 (V) −T2 (V)) (1) where abs () is a function for obtaining an absolute value, T1
(V) is the light transmittance when the applied voltage of the liquid crystal 10 is V, and T2 (V) is the light transmittance when the applied voltage of the liquid crystal 11 is also V.
【００２０】このようにして、液晶に対する印加電圧を
変化させることにより、液晶表示装置１の表示数字等の
コントラストを変化させることができる。このような液
晶表示装置１をバックライト照明した場合、印加電圧Ｖ
１において液晶１０と液晶１１の各領域はともに白色
（高輝度）に見え、印加電圧Ｖ２において液晶１０は白
色（高輝度）に見えるとともに液晶１１はグレー（低輝
度）に見える。更に、電圧を下げて無印加の状態にする
と、液晶１０はグレー（高輝度）に見え、液晶１１は黒
色（低輝度）に見える。In this manner, by changing the voltage applied to the liquid crystal, the contrast of the display numbers and the like of the liquid crystal display device 1 can be changed. When such a liquid crystal display device 1 is illuminated with backlight, the applied voltage V
In FIG. 1, the respective regions of the liquid crystal 10 and the liquid crystal 11 both appear white (high luminance), and at the applied voltage V2, the liquid crystal 10 appears white (high luminance) and the liquid crystal 11 appears gray (low luminance). Further, when the voltage is reduced to a state where no voltage is applied, the liquid crystal 10 looks gray (high luminance) and the liquid crystal 11 looks black (low luminance).
【００２１】このように、電圧の無印加時に、数字等が
表示される一方、印加電圧を上げていくとある電圧以上
で数字等が見えなくなる。かかる構成の液晶表示装置
は、電圧を印可していない状態で表示ができるので、例
えば電圧低下時の警告をする警告灯の表示に用いること
ができる。As described above, when no voltage is applied, numbers and the like are displayed, but when the applied voltage is increased, the numbers and the like become invisible at a certain voltage or higher. Since the liquid crystal display device having such a configuration can perform display without applying a voltage, it can be used, for example, for displaying a warning light for giving a warning when the voltage drops.
【００２２】なお、この場合、電圧Ｖは、直流電圧でよ
いが、交流電圧でもよく、また液晶表示装置は、デュー
ティ駆動により行われる。In this case, the voltage V may be a DC voltage, but may be an AC voltage, and the liquid crystal display device is operated by duty driving.
【００２３】また、高分子分散型液晶を図４のように電
圧光透過率特性に差を持たせるように作製するには、例
えば、液晶と高分子樹脂との混合比を変えることにより
実現でき、また、高分子樹脂に紫外光硬化性のものを用
いた場合には硬化時の温度を変えて硬化後の樹脂の網目
構造を変えることにより実現できる。In order to produce a polymer-dispersed liquid crystal having a difference in the voltage light transmittance characteristic as shown in FIG. 4, for example, it can be realized by changing the mixing ratio between the liquid crystal and the polymer resin. Further, when an ultraviolet-curable polymer resin is used as the polymer resin, it can be realized by changing the temperature at the time of curing to change the network structure of the cured resin.
【００２４】〈第２の実施の形態〉第２の実施の形態に
おける液晶表示装置は、図１〜図３に示すものと同一の
構成であるが、各液晶１０，１１における印加電圧と光
透過率との関係を図５のようにしたものである。<Second Embodiment> A liquid crystal display device according to a second embodiment has the same configuration as that shown in FIGS. 1 to 3 except for the applied voltage and light transmission in each of the liquid crystals 10 and 11. The relationship with the ratio is as shown in FIG.
【００２５】図５に示す電圧光透過率特性曲線１０３が
液晶１０の特性を、電圧光透過率曲線１０４が液晶１１
の特性をそれぞれ示している。図４から分かるように、
印加電圧がＶ３のとき、液晶１０の光透過率Ｔ３（Ｖ
３）と液晶１１の光透過率Ｔ４（Ｖ３）とが等しくな
り、両液晶１０，１１の光透過率に差がないため、液晶
１１による数字「８８８８」は視認できない。しかし、
印加電圧が上昇してＶ４となると、液晶１０の光透過率
Ｔ３（Ｖ４）が液晶１１の光透過率Ｔ４（Ｖ４）よりも
小さくなるため、両液晶１０，１１の光透過率に差が生
じるために、液晶１１による数字「８８８８」を視認で
きるようになる。印加電圧Ｖのときの光透過率差ＤＴ
（Ｖ）は、式（１）と同じように次の式（２）により表
すことができる。The voltage light transmittance characteristic curve 103 shown in FIG. 5 shows the characteristics of the liquid crystal 10, and the voltage light transmittance curve 104 shows the characteristics of the liquid crystal 11.
Are shown. As can be seen from FIG.
When the applied voltage is V3, the light transmittance T3 (V
3) and the light transmittance T4 (V3) of the liquid crystal 11 become equal, and there is no difference between the light transmittances of the two liquid crystals 10 and 11, so that the numeral “8888” by the liquid crystal 11 cannot be visually recognized. But,
When the applied voltage rises to V4, the light transmittance T3 (V4) of the liquid crystal 10 becomes smaller than the light transmittance T4 (V4) of the liquid crystal 11, so that there is a difference between the light transmittances of the two liquid crystals 10, 11. Therefore, the numeral “8888” by the liquid crystal 11 can be visually recognized. Light transmittance difference DT at applied voltage V
(V) can be expressed by the following equation (2), similarly to equation (1).
【００２６】 ＤＴ（Ｖ）＝ａｂｓ（Ｔ３（Ｖ）−Ｔ４（Ｖ）） （２） 〈第３の実施の形態〉図６は本発明の第３の実施の形態
によるより具体的な液晶表示装置の分解斜視図である。
図６示す液晶表示装置１９は、電圧−光透過率特性の異
なる高分子分散型液晶層１６ａ，１６ｂと、これらの液
晶層１６ａ，１６ｂを挟み込むように配置された透光性
電極１５ａ，１５ｂと、これらの電極１５ａ，１５ｂに
交流電圧を付加する交流電源１７と、この電源１７をＯ
Ｎ／ＯＦＦ制御するスイッチ１８とを備えている。スイ
ッチ１８により高分子分散型液晶層１６ａ，１６ｂの光
透過性、光拡散状態を制御する。DT (V) = abs (T3 (V) −T4 (V)) (3) <Third Embodiment> FIG. 6 shows a more specific liquid crystal display according to a third embodiment of the present invention. It is an exploded perspective view of a device.
The liquid crystal display device 19 shown in FIG. 6 includes polymer dispersed liquid crystal layers 16a and 16b having different voltage-light transmittance characteristics, and translucent electrodes 15a and 15b arranged so as to sandwich these liquid crystal layers 16a and 16b. An AC power supply 17 for applying an AC voltage to these electrodes 15a and 15b;
A switch 18 for performing N / OFF control. The switch 18 controls the light transmittance and light diffusion state of the polymer dispersed liquid crystal layers 16a and 16b.
【００２７】高分子分散型液晶層１６ａ，１６ｂの各電
圧−光透過率特性を図７に示し、電圧光透過率特性曲線
１０５ａが液晶層１６ａの特性を、電圧光透過率曲線１
０５ｂが液晶層１６ｂの特性をそれぞれ示している。図
７から分かるように、高分子分散型液晶層１６ｂは、電
圧を印可していない状態で大きな光透過率を示す。FIG. 7 shows the voltage-light transmittance characteristics of the polymer-dispersed liquid crystal layers 16a and 16b. The voltage light transmittance characteristic curve 105a shows the characteristics of the liquid crystal layer 16a and the voltage light transmittance curve 1
05b shows the characteristics of the liquid crystal layer 16b. As can be seen from FIG. 7, the polymer-dispersed liquid crystal layer 16b shows a large light transmittance when no voltage is applied.
【００２８】図８は、図６の液晶表示装置１９の表示状
態を示す平面図である。いま、交流電源１７の電圧をＶ
５にしてスイッチ１８をオンすると、図７に示すよう
に、図６の両電極１５ａ，１５ｂに挟まれた液晶層１６
ａは光透過率が上昇し、電極１５ａ，１５ｂに挟まれて
いない液晶層１６ｂの光透過率とほぼ等しくなる。液晶
層１６ａに対応するのは図８の領域２０であり、液晶層
１６ｂと対応するのが領域２１であるから、図８におい
て領域２０と領域２１とは区別の付かない状態となる。
なお、電極１５ａ，１５ｂの交流電源との接続のための
各端子は、図６のように互いに重なり合わないように電
極１５ａでは図の上方側に、電極１５ｂでは図の下方側
に、それぞれ設けられているから、スイッチ１８がオン
のとき、電圧は液晶層１６ｂには印加されない。FIG. 8 is a plan view showing a display state of the liquid crystal display device 19 of FIG. Now, the voltage of the AC power supply 17 is set to V
5 and the switch 18 is turned on, as shown in FIG. 7, the liquid crystal layer 16 sandwiched between the electrodes 15a and 15b in FIG.
The light transmittance a increases and becomes substantially equal to the light transmittance of the liquid crystal layer 16b not interposed between the electrodes 15a and 15b. The region 20 in FIG. 8 corresponds to the liquid crystal layer 16a, and the region 21 corresponds to the liquid crystal layer 16b. Therefore, in FIG. 8, the region 20 and the region 21 are indistinguishable.
The terminals for connecting the electrodes 15a and 15b to the AC power supply are provided on the upper side of the figure for the electrode 15a and on the lower side of the figure for the electrode 15b so as not to overlap each other as shown in FIG. Therefore, when the switch 18 is turned on, no voltage is applied to the liquid crystal layer 16b.
【００２９】次に、スイッチ１８をオフにすると、図６
の液晶層１６ａは光拡散状態（白濁状態）となり光透過
率がほぼゼロとなる一方、液晶層１６ｂはスイッチオフ
前と同じ光透過状態であるから、図８において領域２０
と領域２１とは明りょうに区別できるようになる。この
ようにして、光透過性であり明るい領域２１の中に閉領
域である光透過性でない暗い領域２０を表示することが
できる。そして、かかる構成を、電極の配置が複雑とな
らずに簡単な電極配置により、実現することができる。Next, when the switch 18 is turned off, FIG.
The liquid crystal layer 16a has a light diffusion state (white turbid state) and the light transmittance is almost zero, while the liquid crystal layer 16b has the same light transmission state as before the switch-off.
And the region 21 can be clearly distinguished. In this manner, the non-light-transmitting dark area 20 that is a closed area can be displayed in the light-transmitting and light area 21. Such a configuration can be realized by a simple electrode arrangement without complicated electrode arrangement.
【００３０】以上のように、各実施の形態によれば、領
域毎に高分子分散型液晶の各電圧−光透過率特性を異な
らせることにより、全面に透光性電極を配置しても（ま
たは電極の簡単な配置で）閉領域の表示・非表示が可能
となる。従って、図９に示す従来の液晶表示装置のよう
に、閉領域の表示のために必然的に生じてしまう電極端
子部の表示といった表示品質の低下の問題はない。As described above, according to each embodiment, the voltage-light transmittance characteristics of the polymer-dispersed liquid crystal are different for each region, so that the light-transmitting electrodes can be arranged on the entire surface ( Alternatively, it is possible to display / hide the closed area (with simple arrangement of the electrodes). Therefore, unlike the conventional liquid crystal display device shown in FIG. 9, there is no problem of deterioration of display quality such as display of an electrode terminal portion which is inevitably generated for displaying a closed region.
【００３１】なお、透光性電極を分割して形成し、高分
子分散型液晶の第１の液晶領域と第２の液晶領域とをそ
れぞれ独立して制御するようにすると、印加電圧をそれ
ぞれ独立に設定できるから、例えば第１の液晶領域と第
２の液晶領域の光透過率の差が大きくなるようにでき、
コントラスト差が大きくなり、表示の視認性を高めるこ
とが可能となる。また、各光透過率をほぼ等しくして表
示を見えなくすることを、任意の光透過率において可能
とすることができる。It is to be noted that if the translucent electrode is formed by dividing and the first liquid crystal region and the second liquid crystal region of the polymer-dispersed liquid crystal are controlled independently, the applied voltage is controlled independently. Therefore, for example, the difference in light transmittance between the first liquid crystal region and the second liquid crystal region can be increased,
The contrast difference increases, and the visibility of the display can be improved. In addition, it is possible to make the display invisible by making the respective light transmittances substantially equal at an arbitrary light transmittance.
【００３２】また、例えば図４に示す電圧光透過率特性
が温度依存性を有する場合、温度が両液晶領域の光透過
率の差として現れるから、温度計としても利用すること
ができる。この場合、電極に印加する液晶の駆動電圧を
調整することにより、温度校正を行うことができる。Further, for example, when the voltage light transmittance characteristic shown in FIG. 4 has temperature dependence, the temperature appears as a difference between the light transmittances of the two liquid crystal regions, so that it can be used as a thermometer. In this case, temperature calibration can be performed by adjusting the drive voltage of the liquid crystal applied to the electrodes.
【００３３】[0033]
【発明の効果】本発明によれば、電極の端子部等が表示
されてしまうことなく簡単な電極構成で閉領域を表示す
ることのできる液晶表示装置を提供することができる。According to the present invention, it is possible to provide a liquid crystal display device capable of displaying a closed region with a simple electrode configuration without displaying the terminal portions of the electrodes and the like.
【図１】本発明の第１の実施の形態による高分子分散型
液晶を用いた液晶表示装置の平面図である。FIG. 1 is a plan view of a liquid crystal display device using a polymer dispersed liquid crystal according to a first embodiment of the present invention.
【図２】図１のII−II線断面図である。FIG. 2 is a sectional view taken along line II-II of FIG.
【図３】図１のIII−III線断面図である。FIG. 3 is a sectional view taken along line III-III of FIG. 1;
【図４】図１の各高分子分散型液晶の印加電圧と光透過
率との関係を示す図である。FIG. 4 is a diagram showing a relationship between an applied voltage and light transmittance of each polymer-dispersed liquid crystal of FIG.
【図５】第２の実施の形態における各高分子分散型液晶
の印加電圧と光透過率との関係を示す図である。FIG. 5 is a diagram illustrating a relationship between an applied voltage and light transmittance of each polymer-dispersed liquid crystal according to the second embodiment.
【図６】第３の実施の形態による液晶表示装置の分解斜
視図である。FIG. 6 is an exploded perspective view of a liquid crystal display device according to a third embodiment.
【図７】図６の各高分子分散型液晶層の印加電圧と光透
過率との関係を示す図である。FIG. 7 is a diagram showing a relationship between an applied voltage and light transmittance of each polymer-dispersed liquid crystal layer of FIG.
【図８】図６の液晶表示装置の平面図である。8 is a plan view of the liquid crystal display device of FIG.
【図９】従来の液晶表示素子を説明するための平面図で
ある。FIG. 9 is a plan view for explaining a conventional liquid crystal display element.
１，１９ 液晶表示装置 １０ 高分子分散型液晶
（第１の液晶領域） １１ 高分子分散型液晶
（第２の液晶領域） １０１，１０３，１０５ａ 第１の液晶領域の電
圧光透過率特性曲線 １０２，１０４，１０５ｂ 第２の液晶領域の電
圧光透過率特性曲線 １２ 透光性電極 １３ ガラス基板 １４ シール材 １６ａ 高分子分散型液晶層
（第１の液晶領域） １６ｂ 高分子分散型液晶層
（第２の液晶領域） １５ａ，１５ｂ 透光性電極Reference Signs List 1,19 Liquid crystal display device 10 Polymer dispersed liquid crystal (first liquid crystal region) 11 Polymer dispersed liquid crystal (second liquid crystal region) 101,103,105a Voltage light transmittance characteristic curve of first liquid crystal region 102 , 104, 105b Voltage light transmittance characteristic curve of second liquid crystal region 12 Translucent electrode 13 Glass substrate 14 Sealing material 16a Polymer dispersed liquid crystal layer (first liquid crystal region) 16b Polymer dispersed liquid crystal layer (second liquid crystal region) 2a) 15a, 15b translucent electrode
───────────────────────────────────────────────────── フロントページの続き (72)発明者 上田 武彦 東京都千代田区丸の内３丁目２番３号 株 式会社ニコン内 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takehiko Ueda Nikon Corporation, 2-3-2 Marunouchi, Chiyoda-ku, Tokyo
Claims (7)
晶により所定の表示を行う液晶表示装置において、 光透過率と印加電圧とが第１の関係で変化する第１の液
晶領域と、光透過率と印加電圧とが第１の関係と異なる
第２の関係で変化する第２の液晶領域とを有することを
特徴とする液晶表示装置。1. A liquid crystal display device for performing a predetermined display by using a liquid crystal in which light transmittance changes according to an applied voltage, a first liquid crystal region in which light transmittance and an applied voltage change in a first relationship, A liquid crystal display device comprising: a second liquid crystal region in which light transmittance and applied voltage change in a second relationship different from the first relationship.
透過率の差により前記所定の表示を行うとともに、前記
印加電圧を変化させることにより第１の液晶領域と第２
の液晶領域との光透過率を同一または近似させて前記所
定の表示を視認できないようにすることを特徴とする請
求項１記載の液晶表示装置。2. The method according to claim 1, wherein the predetermined display is performed by a difference in light transmittance between the first liquid crystal region and the second liquid crystal region, and the first liquid crystal region and the second liquid crystal region are changed by changing the applied voltage.
2. The liquid crystal display device according to claim 1, wherein the predetermined display is made invisible by making the light transmittance with the liquid crystal region the same or similar.
構成されている請求項１または２記載の液晶表示装置。3. The liquid crystal display device according to claim 1, wherein each of the liquid crystal regions is made of a polymer dispersed liquid crystal.
ようパターン化されているとともに、第２の液晶領域に
包囲されている請求項１，２または３記載の液晶表示装
置。4. The liquid crystal display device according to claim 1, wherein the first liquid crystal region is patterned so as to perform the predetermined display, and is surrounded by the second liquid crystal region.
対の透光性基板の間に挟み込まれている請求項１，２，
３または４記載の液晶表示装置。5. The liquid crystal display according to claim 1, wherein the first liquid crystal region and the second liquid crystal region are sandwiched between a pair of translucent substrates.
5. The liquid crystal display device according to 3 or 4.
透光性電極を前記一対の透光性基板の全面にそれぞれ備
えさせた請求項５記載の液晶表示装置。6. The liquid crystal display device according to claim 5, wherein a light-transmitting electrode for applying a voltage to each of said liquid crystal regions is provided on the entire surface of said pair of light-transmitting substrates.
対の透光性基板の間に挟み込まれており、前記各液晶領
域に電圧を印可するための透光性電極を前記一対の透光
性基板にそれぞれ備えさせ、前記透光性電極の少なくと
も一方を前記パターン化された第１の液晶領域に対応す
るよう分割して設けた請求項４記載の液晶表示装置。7. A first liquid crystal region and a second liquid crystal region are sandwiched between a pair of translucent substrates, and a translucent electrode for applying a voltage to each of the liquid crystal regions is provided on the pair of light transmissive electrodes. 5. The liquid crystal display device according to claim 4, wherein at least one of said light-transmitting electrodes is divided and provided corresponding to said patterned first liquid crystal region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20391897A JP4013292B2 (en) | 1997-07-15 | 1997-07-15 | Liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20391897A JP4013292B2 (en) | 1997-07-15 | 1997-07-15 | Liquid crystal display |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007181210A Division JP4770805B2 (en) | 2007-07-10 | 2007-07-10 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1138380A true JPH1138380A (en) | 1999-02-12 |
| JP4013292B2 JP4013292B2 (en) | 2007-11-28 |
Family
ID=16481857
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20391897A Expired - Lifetime JP4013292B2 (en) | 1997-07-15 | 1997-07-15 | Liquid crystal display |
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| Country | Link |
|---|---|
| JP (1) | JP4013292B2 (en) |
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1997
- 1997-07-15 JP JP20391897A patent/JP4013292B2/en not_active Expired - Lifetime
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|---|---|
| JP4013292B2 (en) | 2007-11-28 |
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