JPH0359953B2 - - Google Patents
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- Publication number
- JPH0359953B2 JPH0359953B2 JP59187161A JP18716184A JPH0359953B2 JP H0359953 B2 JPH0359953 B2 JP H0359953B2 JP 59187161 A JP59187161 A JP 59187161A JP 18716184 A JP18716184 A JP 18716184A JP H0359953 B2 JPH0359953 B2 JP H0359953B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- voltage
- crystal composition
- formula
- carbon atoms
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000203 mixture Substances 0.000 claims description 23
- 150000001875 compounds Chemical class 0.000 claims description 17
- 125000004432 carbon atom Chemical group C* 0.000 claims description 9
- 125000000217 alkyl group Chemical group 0.000 claims description 7
- 239000004988 Nematic liquid crystal Substances 0.000 claims description 5
- 125000003545 alkoxy group Chemical group 0.000 claims description 2
- 229910052801 chlorine Inorganic materials 0.000 claims description 2
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 125000001153 fluoro group Chemical group F* 0.000 claims description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 31
- 238000000034 method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 239000004990 Smectic liquid crystal Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 238000005090 crystal field Methods 0.000 description 1
- IGARGHRYKHJQSM-UHFFFAOYSA-N cyclohexylbenzene Chemical compound C1CCCCC1C1=CC=CC=C1 IGARGHRYKHJQSM-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Liquid Crystal Substances (AREA)
Description
（産業上の利用分野）
本発明は電界効果型液晶表示素子、特に高時分
割駆動方式の素子に用いる材料として好適な液晶
組成物に関するものである。
（従来の技術）
液晶表示素子は、従来の時計、電卓等に加え、
近年になつて携帯用コンピユーター、携帯用テレ
ビ、各種事務計測機器等の大型でより多くの情報
を表示できる表示体にも用途が拡大し始めてい
る。この様な要求に対応した駆動方式の一つに電
圧平均化法による時分割駆動方式があり、現在、
高時分割駆動方式の液晶表示素子が市場に出され
るようになつてきた。それに伴い高時分割駆動方
式に適合した液晶組成物が望まれているが、従来
の組成物の多くのものがこの方式に適合性を有し
ない。
（発明が解決しようとする問題点）
表示素子に用いられる液晶組成物に一般的に要
求される特性は、
(1) 室温附近の広温度範囲で液晶であること、
(2) 化学的、熱化学的に安定であること、
(3) 比較的低粘性であること、
(4) 温度変化及び視野変化による電圧−輝度特性
の変化が小さいこと、
(5) 電圧−輝度特性が急峻であること、
等であるが、高時分割駆動を行なう場合、特に(5)
の特性が重要である。それについてドツトマトリ
クス表示素子を例にとつて以下に説明する。
第１図において、下板にストライブ状のY1，
Y2，Y3…Ym電極（信号電極）を、下板に対し
て一定の間隙を有する上板に同様にストライブ状
のX1，X2，X3…Xn電極（走査電極）を形成し、
両電極間に液晶を存在させる。文字図形の表示は
Ｘ，Ｙ両電極の各交点部の液晶を選択的に点灯、
或は点灯して行なう。ある走査電極（図において
X3）が選択されたとき、その電極上の総て画素
に信号電極Y1，Y2…Ymより表示すべき信号に
従い点灯、或いは非点灯の表示信号を同時に加え
る。つまり、走査電極と信号電極に加える電圧パ
ルスの組合せで両電極の交点部を点灯、或いは非
点灯にする。従つて、例えば点灯点以外の非点
灯点、、にも電圧が印加されることにな
る。点灯点には高い実効電圧、非点灯点には低い
実効電圧がそれぞれ印加され、その電圧差によつ
て点灯及び非点灯状態をつくり、文字、図形等の
表示を行なつている。点灯点の電圧と非点灯点の
電圧とは相互に関係があり、この関係は以下の式
で表わすことができる。
点灯点印加実効電圧
非点灯点印加実効電圧
動作マージン
但し、ａ＝√＋１
V0：駆動電源電圧
ａ：バイアス比
Ｎ：時分割走査線数
第２図は時分割走査線数（Ｎ）と動作マージン
（α）との関係を示す図である。この図から明ら
かの如く、Ｎの増大に伴つてαは１に漸近する。
即ち、高時分割駆動方式では点灯点と非点灯点の
電圧差が極端に小さくなる。
液晶の電界効果型表示における一般的な電圧−
輝度特性は第３図に示す如くカーブを描く。時分
割駆動方式で良好な表示を得るためには点灯点の
印加実効電圧（Vpo）は飽和実効電圧（Vsat）以
上の電圧、非点灯点の印加実効電圧（Vpff）はし
きい値実効電圧（Vth）以下の電圧であることが
必要である。従つて、Vsat／Vth（＝γ）≦Vpo／
Vpff（α）の関係式が満足されなければならない。
γ＞αとなるような液晶組成物を用いる場合に
は、表示濃度の低下、クロストークの発生等の表
示に悪い影響が生ずる。どの程度の輝度を示す実
効電圧をVsat又はVthとするかの基準は現在業界
では一定ではないが、一般的に、輝度50〜90％の
範囲内に設定した或る輝度を与えるときの実効電
圧をVsat（第３図では、Vsatの輝度は80％に設定
されている。）、輝度10〜20％の範囲内に設定した
或る輝度を与えるときの実効電圧をVth（第３図で
は、Vthの輝度は10％に設定されている。）として
いる。いずれにしても上述した通り、時分割走査
線数の増大に伴つてα値が低下するから、γ値も
また低下しなければならない。即ち、高時分割駆
動方式では、γ値の小さな液晶組成物、換言すれ
ば、第３図に示す如く、僅かな印加電圧の変化で
輝度が急峻に変化する液晶組成物が必要とされ
る。
これらの要求特性を一部解決した液晶組成物と
して、特開昭57−2384号公報、特開昭58−63779
号公報及び特開昭58−210982号公報には、下記一
般式(1)の化合物及び下記一般式(3)の化合物を含有
する液晶組成物が記載されているが、低温領域で
スメクチツク相を呈するために、駆動不能とな
る、粘度が高く、その結果、応答速度が遅い、或
いは、しきい値電圧が満足できる程度に低いとは
言えない等の問題点を有している。
以上要するに、本発明の目的は、前記(1)〜(4)の
各特性に加え、特に前記(5)の急峻な電圧−輝度特
性をもつ液晶組成物を提供することにある。
（問題点を解決するための手段）
上記の発明の目的は、
一般式
（式中、Ｒは炭素原子数１〜10の直鎖状アルキ
ル基、R′は炭素原子数１〜10の直鎖状アルコキ
シル基を表わす。）
で表わされる化合物（以下、化合物(1)という）、
一般式
（式中、Ｒは炭素原子数１〜10の直鎖状アルキ
ル基を表わす。）
で表わされる化合物（以下、化合物(2)という）
及び
一般式
（式中、Ｒは炭素原子数１〜10の直鎖状アルキ
ル基、Ｘは水素原子、弗素原子又は塩素原子を表
わす。）
で表わされる化合物（以下、化合物(3)という）
を含有することを特徴とするネマチツク液晶組成
物によつて達成される。
本発明の液晶組成物は上記の化合物(1)、(2)及び
(3)のほかに、駆動電圧、駆動温度範囲、応答速度
等の各種要求特性に適合するようしきい値電圧、
液晶温度範囲、粘度等を調節する目的で他のネマ
チツク液晶化合物を本発明の目的を害さない範囲
で適当量含有することができる。このような他の
ネマチツク液晶化合物の好適な代表例として下記
一般式(4)〜（16）の化合物を挙げることができ
る。
（上記式(4)〜（16）中、Ｒ及びR′はそれぞれ
炭素原子数１〜10の直鎖状アルキル基を表わす。）
本発明の液晶組成物を構成する各成分の好まし
い配合割合は、化合物(1)35〜60重量％、化合物(2)
５〜35重量％、化合物(3)５〜20重量％、他のネマ
チツク液晶化合物０〜40重量％である。
本発明を更に具体的に明らかにするために次の
実施例を示す。また、比較のために、低粘度液晶
組成物として汎用されているフエニルシクロヘキ
サン系液晶組成物を比較例１とし、大きな屈折率
異方性を有する液晶組成物として汎用されている
ビフエニル系液晶組成物を比較例２とし、実施例
３及び実施例６の液晶組成物から、一般式(2)に相
当する化合物を除いた液晶組成物を各々比較例３
及び比較例４として示す。これら２つの比較例の
液晶組成物は1/2〜1/4デユーテイー時分割表示用
（走査線数４）のものである。
尚、表中に記した下記の用語は下記の意味をも
つ。
M.R.：液晶温度範囲
Δn：屈折率異方性
Δε：誘電率異方性
TN1：ネマチツク相−等方性液体相間転移温度
TSN：スメクチツク相−ネマチツク相間転移温度
(Industrial Application Field) The present invention relates to a liquid crystal composition suitable as a material for use in field-effect liquid crystal display elements, particularly elements of high time division driving method. (Conventional technology) In addition to conventional watches, calculators, etc., liquid crystal display elements are used in
In recent years, its use has begun to expand to larger displays capable of displaying more information, such as portable computers, portable televisions, and various office measuring instruments. One of the drive methods that meets these requirements is a time-division drive method using voltage averaging.
Liquid crystal display elements using a high time-division driving method have begun to be put on the market. Accordingly, there has been a demand for liquid crystal compositions that are compatible with high time division drive systems, but many conventional compositions are not compatible with this system. (Problems to be Solved by the Invention) Characteristics generally required of liquid crystal compositions used in display elements are: (1) being liquid crystal over a wide temperature range around room temperature; (2) chemical and thermal resistance; Chemically stable, (3) relatively low viscosity, (4) little change in voltage-brightness characteristics due to changes in temperature and visual field, (5) steep voltage-brightness characteristics. , etc., but when performing high time division driving, especially (5)
characteristics are important. This will be explained below using a dot matrix display element as an example. In Figure 1, there are striped Y 1 on the lower plate,
Y 2 , Y 3 ... Ym electrodes (signal electrodes) are similarly formed on the upper plate with a certain gap from the lower plate, and strip-shaped X 1 , X 2 , X 3 ... Xn electrodes (scanning electrodes) are formed in the same way. death,
A liquid crystal is placed between both electrodes. To display text and graphics, the liquid crystal at each intersection of the X and Y electrodes is selectively turned on.
Or do it with the lights on. A certain scanning electrode (in the figure
X 3 ) is selected, a display signal of lighting or non-lighting is simultaneously applied to all pixels on that electrode according to the signal to be displayed from the signal electrodes Y 1 , Y 2 , . . . Ym. That is, the combination of voltage pulses applied to the scanning electrode and the signal electrode turns on or off the intersection of both electrodes. Therefore, for example, voltage is also applied to non-lighting points other than the lighting points. A high effective voltage is applied to the lighting point, and a low effective voltage is applied to the non-lighting point, and the voltage difference creates a lighting and non-lighting state, and displays characters, figures, etc. There is a mutual relationship between the voltage at the lighting point and the voltage at the non-lighting point, and this relationship can be expressed by the following equation. Effective voltage applied at lighting point Effective voltage applied at non-lighting point Operating margin However, a=√+1 V 0 : Drive power supply voltage a: Bias ratio N: Number of time-division scanning lines FIG. 2 is a diagram showing the relationship between the number of time-division scanning lines (N) and the operating margin (α). As is clear from this figure, α asymptotically approaches 1 as N increases.
That is, in the high time division driving method, the voltage difference between the lighting point and the non-lighting point becomes extremely small. Typical voltages in liquid crystal field effect displays
The brightness characteristics draw a curve as shown in FIG. In order to obtain a good display using the time-division drive method, the effective voltage applied to the lighting point (V po ) must be at least the saturation effective voltage (V sat ), and the effective voltage applied to the non-lighting point (V pff ) must be the threshold value. The voltage needs to be equal to or lower than the effective voltage (V th ). Therefore, V sat /V th (=γ)≦V po /
The relational expression V pff (α) must be satisfied.
When a liquid crystal composition in which γ>α is used, adverse effects on display such as a decrease in display density and occurrence of crosstalk occur. Currently, there are no fixed standards in the industry regarding how much brightness the effective voltage indicates as V sat or V th , but in general, it is The effective voltage is V sat (in Figure 3, the brightness of V sat is set to 80%), and the effective voltage when giving a certain brightness set within the brightness range of 10 to 20% is V th ( In FIG. 3, the brightness of V th is set to 10%.) In any case, as described above, since the α value decreases as the number of time-division scanning lines increases, the γ value must also decrease. That is, the high time division driving method requires a liquid crystal composition with a small γ value, in other words, a liquid crystal composition whose brightness changes sharply with a slight change in applied voltage, as shown in FIG. As liquid crystal compositions that partially solve these required characteristics, Japanese Patent Application Laid-Open No. 57-2384 and Japanese Patent Application Laid-Open No. 58-63779
No. 58-210982 discloses a liquid crystal composition containing a compound represented by the following general formula (1) and a compound represented by the following general formula (3). However, the viscosity is high and as a result, the response speed is slow, and the threshold voltage is not satisfactorily low. In summary, an object of the present invention is to provide a liquid crystal composition that has not only the characteristics (1) to (4) above, but also the steep voltage-luminance characteristic (5) above. (Means for solving the problem) The purpose of the above invention is to (In the formula, R represents a linear alkyl group having 1 to 10 carbon atoms, and R' represents a linear alkoxyl group having 1 to 10 carbon atoms.) (hereinafter referred to as compound (1)) ), general formula (In the formula, R represents a linear alkyl group having 1 to 10 carbon atoms.) A compound represented by (hereinafter referred to as compound (2)) and the general formula (In the formula, R represents a linear alkyl group having 1 to 10 carbon atoms, and X represents a hydrogen atom, a fluorine atom, or a chlorine atom.) (hereinafter referred to as compound (3)) This is achieved by a nematic liquid crystal composition characterized by: The liquid crystal composition of the present invention comprises the above compounds (1), (2) and
In addition to (3), in order to meet various required characteristics such as drive voltage, drive temperature range, and response speed,
For the purpose of adjusting the liquid crystal temperature range, viscosity, etc., other nematic liquid crystal compounds may be contained in an appropriate amount within a range that does not impair the purpose of the present invention. Preferred representative examples of such other nematic liquid crystal compounds include compounds represented by the following general formulas (4) to (16). (In the above formulas (4) to (16), R and R' each represent a linear alkyl group having 1 to 10 carbon atoms.) The preferred blending ratio of each component constituting the liquid crystal composition of the present invention is , Compound (1) 35-60% by weight, Compound (2)
5 to 35% by weight, compound (3) 5 to 20% by weight, and other nematic liquid crystal compounds 0 to 40% by weight. In order to clarify the present invention more specifically, the following examples are shown. For comparison, a phenylcyclohexane liquid crystal composition that is widely used as a low viscosity liquid crystal composition is used as Comparative Example 1, and a biphenyl liquid crystal composition that is widely used as a liquid crystal composition that has large refractive index anisotropy. Comparative Example 2 was obtained by removing the compound corresponding to general formula (2) from the liquid crystal compositions of Example 3 and Example 6.
and Comparative Example 4. The liquid crystal compositions of these two comparative examples are for 1/2 to 1/4 duty time division display (number of scanning lines: 4). In addition, the following terms written in the table have the following meanings. MR: Liquid crystal temperature range Δn: Refractive index anisotropy Δε: Dielectric constant anisotropy T N1 : Nematic phase - isotropic liquid phase transition temperature T SN : Smectic phase - nematic phase transition temperature
【表】【table】
【表】【table】
【表】【table】
【表】【table】
【表】【table】
【表】【table】
【表】【table】
【表】【table】
【表】【table】
【表】【table】
【表】
上記の各実施例及び比較例の液晶組成物をセル
ギヤツプ(d)の異なる３種類の表示セルに充填し、
各セルのしきい値実効電圧（Vth）と飽和実効電
圧（Vsat）を測定し、VthとVsatからγ値を算出
した。測定では、温度25℃、視角0゜で輝度10％と
なる実効電圧をVthとし、温度25℃、視覚0゜で輝
度80％となる実効電圧をVsatとした。
これらの結果を次表に掲げる。[Table] The liquid crystal compositions of the above examples and comparative examples were filled into three types of display cells with different cell gaps (d),
The threshold effective voltage (V th ) and saturation effective voltage (V sat ) of each cell were measured, and the γ value was calculated from V th and V sat . In the measurement, the effective voltage at which the brightness is 10% at a temperature of 25°C and a visual angle of 0° is defined as V th , and the effective voltage at which the luminance is 80% at a temperature of 25°C and a visual angle of 0° is defined as V sat . These results are listed in the table below.
【表】【table】
【表】
以上の結果から明らかの如く、本発明の液晶組
成物は比較例に比べて高時分割駆動に必須の特性
であるγ特性において著しく改善されており、且
つ低粘度であるから優れた高速応答性を有する。
（発明の効果）
以上詳細に説明した如く、本発明の液晶組成物
は、急峻な電圧−輝度特性を有するので、高時分
割駆動性に優れるという特有の効果を奏する。[Table] As is clear from the above results, the liquid crystal composition of the present invention has significantly improved γ characteristics, which are essential characteristics for high time division driving, compared to the comparative example, and has low viscosity, so it is excellent. Has high-speed response. (Effects of the Invention) As explained in detail above, the liquid crystal composition of the present invention has a steep voltage-luminance characteristic, and therefore has a unique effect of being excellent in high time-division drivability.
第１図は時分割駆動方式を説明するためのドツ
トマトリツク表示素子の平面図、第２図は液晶表
示素子の動作マージンと時分割走査線数の関係を
示す図表、第３図は液晶表示素子の輝度と印加実
効電圧との関係を示す図表である。
Figure 1 is a plan view of a dot matrix display element to explain the time-division driving method, Figure 2 is a chart showing the relationship between the operating margin of a liquid crystal display element and the number of time-division scanning lines, and Figure 3 is a diagram of a liquid crystal display element. It is a chart showing the relationship between luminance and applied effective voltage.
Claims (1)
ル基、R′は炭素原子数１〜10の直鎖状アルコキ
シル基を表わす。） で表わされる化合物。 一般式 （式中、Ｒは炭素原子数１〜10の直鎖状アルキ
ル基を表わす。） で表わされる化合物、及び 一般式 （式中、Ｒは炭素原子数１〜10の直鎖状アルキ
ル基、Ｘは水素原子、弗素原子又は塩素原子を表
わす。） で表わされる化合物 を含有することを特徴とするネマチツク液晶組成
物。[Claims] 1. General formula (In the formula, R represents a linear alkyl group having 1 to 10 carbon atoms, and R' represents a linear alkoxyl group having 1 to 10 carbon atoms.) general formula (In the formula, R represents a linear alkyl group having 1 to 10 carbon atoms.) A compound represented by the following, and the general formula (In the formula, R represents a linear alkyl group having 1 to 10 carbon atoms, and X represents a hydrogen atom, a fluorine atom, or a chlorine atom.) A nematic liquid crystal composition characterized by containing a compound represented by the following formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59187161A JPS6164785A (en) | 1984-09-06 | 1984-09-06 | Nematic liquid crystal composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59187161A JPS6164785A (en) | 1984-09-06 | 1984-09-06 | Nematic liquid crystal composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6164785A JPS6164785A (en) | 1986-04-03 |
| JPH0359953B2 true JPH0359953B2 (en) | 1991-09-12 |
Family
ID=16201188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59187161A Granted JPS6164785A (en) | 1984-09-06 | 1984-09-06 | Nematic liquid crystal composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6164785A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2967129D1 (en) * | 1979-05-28 | 1984-08-30 | Merck Patent Gmbh | Liquid-crystal compositions |
| JPH02285115A (en) * | 1989-04-27 | 1990-11-22 | Taisei Corp | Collecting method for groundwater |
| DE19537802A1 (en) * | 1995-10-11 | 1997-04-17 | Merck Patent Gmbh | Electro-optical liquid crystal display |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572384A (en) * | 1980-06-06 | 1982-01-07 | Hitachi Ltd | Liquid crystal composition |
| JPS5863779A (en) * | 1981-10-12 | 1983-04-15 | Seiko Epson Corp | Liquid crystal composition |
| JPS58210982A (en) * | 1982-06-02 | 1983-12-08 | Hitachi Ltd | Liquid crystal display apparatus |
| JPS59187162A (en) * | 1983-03-24 | 1984-10-24 | Mazda Motor Corp | Lockup control device for automatic speed change gear |
| JPS59191789A (en) * | 1983-04-15 | 1984-10-30 | Hitachi Ltd | Nematic liquid crystal composition for display element |
| JPS60240788A (en) * | 1984-05-15 | 1985-11-29 | Seiko Epson Corp | Liquid crystal composition |
| JPS6134090A (en) * | 1984-07-26 | 1986-02-18 | Seiko Epson Corp | Liquid crystal composition |
-
1984
- 1984-09-06 JP JP59187161A patent/JPS6164785A/en active Granted
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572384A (en) * | 1980-06-06 | 1982-01-07 | Hitachi Ltd | Liquid crystal composition |
| JPS5863779A (en) * | 1981-10-12 | 1983-04-15 | Seiko Epson Corp | Liquid crystal composition |
| JPS58210982A (en) * | 1982-06-02 | 1983-12-08 | Hitachi Ltd | Liquid crystal display apparatus |
| JPS59187162A (en) * | 1983-03-24 | 1984-10-24 | Mazda Motor Corp | Lockup control device for automatic speed change gear |
| JPS59191789A (en) * | 1983-04-15 | 1984-10-30 | Hitachi Ltd | Nematic liquid crystal composition for display element |
| JPS60240788A (en) * | 1984-05-15 | 1985-11-29 | Seiko Epson Corp | Liquid crystal composition |
| JPS6134090A (en) * | 1984-07-26 | 1986-02-18 | Seiko Epson Corp | Liquid crystal composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6164785A (en) | 1986-04-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |