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Nematic liquid crystal display having a memory effect

外国特許コード F110003887
整理番号 E05901EP
掲載日 2011年7月6日
出願国 欧州特許庁(EPO)
出願番号 01947920
公報番号 1300720
公報番号 1300720
出願日 平成13年7月9日(2001.7.9)
公報発行日 平成15年4月9日(2003.4.9)
公報発行日 平成28年3月16日(2016.3.16)
国際出願番号 JP2001005930
国際公開番号 WO2002006887
国際出願日 平成13年7月9日(2001.7.9)
国際公開日 平成14年1月24日(2002.1.24)
優先権データ
  • 2001JP005930 (2001.7.9) WO
  • 特願2000-213040 (2000.7.13) JP
  • 特願2001-066435 (2001.3.9) JP
発明の名称 (英語) Nematic liquid crystal display having a memory effect
発明の概要(英語) An object is to provide a high resolution, wide viewing angle, low power consumption liquid crystal display device which utilizes nematic liquid crystal and which can attain both the memory effect and wide-viewing-angle display characteristic.
A liquid crystal display device utilizes nematic liquid crystal and comprises a pair of transparent substrates (SUB1, SUB2); a group of electrodes for applying to a liquid crystal layer (LCL) disposed between the pair of substrates (SUB1, SUB2) an electric field having a component substantially parallel to the surfaces of the substrates; and an alignment layer disposed between the liquid crystal layer (LCL) and at least one of the pair of substrates (SUB1, SUB2) and having been subjected to liquid crystal anchoring treatments in plural directions.
The plurality of liquid crystal anchoring directions of the alignment layer form substantially equal angles relative to one another, and a rising angle in each of the liquid crystal anchoring directions with respect to the corresponding substrate surface is substantially zero.
特許請求の範囲(英語) [claim1]
1. A liquid crystal display device comprising: a pair of substrates (SUB1,SUB2), at least one of which (SUB1,SUB2) is transparent; a group of electrodes (EL1,EL2) arranged on one of or both of the substrates (SUB1,SUB2) and adapted to apply an electric field to a nematic type liquid crystal layer (LCL) disposed between the substrates (SUB1,SUB2) when a drive voltage (V1,V2) is applied to the electrodes (EL1,EL2), to allow in-plane switching of the liquid crystal layer (LCL), the electric field having a component substantially parallel to the surfaces of the substrates (SUB1 ,SUB2); and an alignment layer (AL1) disposed between the liquid crystal layer (LCL) and the same one of or both substrates (SUB1,SUB2) characterised in that the alignment layer (AL1) has been subjected to alignment layer treatment in two directions to create two liquid crystal anchoring directions, between which the liquid crystal anchoring force does not differ greatly and in at least one of which the pre-tilt angle with respect to the corresponding substrate surface is substantially zero, wherein the liquid crystal anchoring directions form substantially equal angles relative to one another on the corresponding substrate surface (SUB1,SUB2), so that the liquid crystal layer (LCL) is provided with a memory effect in which liquid crystal alignment remains energetically stable in a first and a second alignment state after the drive voltage (V1,V2) has been removed from the electrodes (EL1,EL2); wherein the group of electrodes (EL1,EL2) comprises a first and a second pair of electrodes (EL1A,EL1B,EL2A,EL2B) and the drive voltage comprises a first and second drive voltage (V1,V2), wherein the first pair of electrodes (EL1A,EL1B) is arranged to provide a different electric field orientation to that provided by the second pair of electrodes (EL2A,EL2B), such that on applying the first drive voltage (V1) to the first pair of electrodes (EL1 A,EL1 B) a first electric field is produced which causes the liquid crystal layer (LCL) to align with the first alignment state and on applying the second drive voltage (V2) to the second pair of electrodes (EL2A,EL2B) a second electric field is produced which causes the liquid crystal layer (LCL) to align with the second alignment state.
[claim2]
2. A liquid crystal display device according to claim 1, wherein the two liquid crystal anchoring directions are at an angle of substantially 90 deg. relative to one another.
[claim3]
3. A liquid crystal display device comprising: a pair of substrates (SUB1,SUB2), at least one of which (SUB1,SUB2) is transparent; a group of electrodes arranged on one of or both of the substrates (SUB1,SUB2) and adapted to apply an electric field to a nematic type liquid crystal layer (LCL) disposed between the substrates (SUB1,SUB2) when a drive voltage is applied to the electrodes, to allow in-plane switching of the liquid crystal layer (LCL), the electric field having a component substantially parallel to the surfaces of the substrates (SUB1 ,SUB2); and an alignment layer (AL1) disposed between the liquid crystal layer (LCL) and the same one of or both substrates (SUB1, SUB2) characterised in that the alignment layer (AL1) has been subjected to alignment layer treatment in three directions to create three liquid crystal anchoring directions, between which the liquid crystal anchoring force does not differ greatly and in all of which the pre-tilt angle with respect to the corresponding substrate surface is substantially zero, wherein the liquid crystal anchoring directions form substantially equal angles relative to one another on the corresponding substrate surface (SUB1,SUB2), so that the liquid crystal layer (LCL) is provided with a memory effect in which liquid crystal alignment remains energetically stable in a first, a second and a third alignment state after the drive voltage has been removed from the electrodes; wherein the group of electrodes comprises a first, a second and a third pair of electrodes and the drive voltage comprises a first, a second and a third drive voltage, wherein the first, second and third pairs of electrodes are arranged to provide different electric field orientations to one another, such that on applying the first drive voltage to the first pair of electrodes a first electric field is produced which causes the liquid crystal layer (LCL) to align with the first alignment state, on applying the second drive voltage to the second pair of electrodes a second electric field is produced which causes the liquid crystal layer (LCL) to align with the second alignment state, and on applying the third drive voltage to the third pair of electrodes a third electric field is produced which causes the liquid crystal layer (LCL) to align with the third alignment state.
[claim4]
4. A liquid crystal display device according to any one of the preceding claims, wherein in addition to the group of electrodes (EL1,EL2) formed on one of the pair of substrates (SUB1) for applying to the liquid crystal layer (LCL) an electric field having a component substantially parallel to the surfaces of the substrates (SUB1,SUB2), an additional electrode (E2LB) is disposed on each of the substrates in such a manner that these additional electrodes form an electrode pair.
[claim5]
5. A liquid crystal display device comprising: a pair of substrates (SUB1,SUB2), at least one of which (SUB1,SUB2) is transparent; a group of electrodes arranged on one of or both of the substrates (SUB1,SUB2) and adapted to apply an electric field to a nematic type liquid crystal layer (LCL) disposed between the substrates (SUB1,SUB2) when a drive voltage (V1) is applied to the electrode, to allow in-plane switching of the liquid crystal layer (LCL), the electric field having a component substantially parallel to the surfaces of the substrates (SUB1 ,SUB2); and an alignment layer (AL1) disposed between the liquid crystal layer (LCL) and the same one of or both substrates (SUB1,SUB2) characterised in that the alignment layer (AL1) has been subjected to alignment layer treatment in two directions to create two liquid crystal anchoring directions, between which the liquid crystal anchoring force does not differ greatly and in at least one of which the pre-tilt angle with respect to the corresponding substrate surface is substantially zero, wherein the liquid crystal anchoring directions form substantially equal angles relative to one another on the corresponding substrate surface (SUB1,SUB2), so that the liquid crystal layer (LCL) is provided with a memory effect in which liquid crystal alignment remains energetically stable in a first and a second alignment state after the drive voltage (V1) has been removed from the electrode; wherein the group of electrodes comprises a pair of electrodes (EL1A,EL1 B), the drive voltage (V1) is a two-frequency drive voltage, and the liquid crystal layer (LCL) is formed of a liquid crystal material whose dielectric anisotropy (DELTA epsilon ) becomes positive or negative depending on the frequency of an applied AC electric field, such that on applying the drive voltage (V1) at a first frequency to the electrodes (EL1A,EL1B) a first electric field is produced which causes the liquid crystal layer (LCL) to align with the first alignment state and on applying the drive voltage (V1) at the second frequency to the electrodes (EL1A,EL1B) a second electric field is produced which causes the liquid crystal layer (LCL) to align with the second alignment state.
[claim6]
6. A liquid crystal display device according to any one of the preceding claims, wherein the alignment layer has been treated such that an entire target area of the alignment layer has been divided into plural sub-areas corresponding to the two or three alignment treatment directions, such that in each sub-area an alignment treatment has been performed in the corresponding alignment treatment direction.
[claim7]
7. A liquid crystal display device according to any one of the preceding claims, wherein the alignment layer has been treated with at least one of the alignment layer treatments in the two or three directions which was a process for irradiating the alignment layer (AL1) with linearly polarized light that caused a chemical reaction on the surface of the corresponding substrate (SUB1,SUB2).
[claim8]
8. A liquid crystal display device according to any one of claims 1 to 6, wherein the alignment layer has been treated with at least one of the alignment layer treatments in the two or three directions which was a process for scanning the alignment layer (AL1) with a probe that imparted stress to the surface of the corresponding substrate (SUB1 ,SUB2).
[claim9]
9. A liquid crystal display device according to any one of claims 1 to 6, wherein the alignment layer has been treated with at least one of the alignment layer treatments in the two or three directions which was a process for scanning the alignment layer (AL1) with light that caused a chemical reaction on the surface of the corresponding substrate (SUB1,SUB2).
[claim10]
10. A liquid crystal display device according to any one of the preceding claims, wherein the liquid crystal layer (LCL) comprises a liquid crystal material which contains chiral molecules as a component.
[claim11]
11. A liquid crystal display device according to any one of the preceding claims, wherein a light reflection plate (REF) is disposed on one of the pair of substrates (SUB1).
  • 出願人(英語)
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • YONEYA MAKOTO
  • KIM JONG-HYUN
  • YOKOYAMA HIROSHI
  • YAMAMOTO JUN
国際特許分類(IPC)
欧州特許分類/主・副
  • G02F001/1337M
  • G02F001/139B
  • S02F001/1337L
  • S02F001/1337M
  • S02F001/1337M2
  • S02F001/1343A8
  • S02F001/139C
指定国 Contracting States: DE FR GB NL
参考情報 (研究プロジェクト等) ERATO Yokoyama Nano structured Liquid Crystal AREA
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