WO2001033291A1 - Afficheur a cristaux liquides anti-ferroelectriques de type reflectif - Google Patents

Afficheur a cristaux liquides anti-ferroelectriques de type reflectif Download PDF

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Publication number
WO2001033291A1
WO2001033291A1 PCT/KR2000/001265 KR0001265W WO0133291A1 WO 2001033291 A1 WO2001033291 A1 WO 2001033291A1 KR 0001265 W KR0001265 W KR 0001265W WO 0133291 A1 WO0133291 A1 WO 0133291A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
antiferroelectric liquid
reflective type
crystal display
phase retardation
Prior art date
Application number
PCT/KR2000/001265
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English (en)
Inventor
Sin-Doo Lee
Original Assignee
Smartdisplay Co. Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Smartdisplay Co. Ltd. filed Critical Smartdisplay Co. Ltd.
Priority to AU11774/01A priority Critical patent/AU1177401A/en
Publication of WO2001033291A1 publication Critical patent/WO2001033291A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/141—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent using ferroelectric liquid crystals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/141—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent using ferroelectric liquid crystals
    • G02F1/1412—Antiferroelectric liquid crystals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/40—Materials having a particular birefringence, retardation

Definitions

  • the present invention relates to an antiferroelectric liquid crystal display (LCD) for a reflective type and, more particularly, to an antiferroelectric LCD which uses a single polarizer and phase retardation film to obtain high contrast, excellent brightness, fast response, and wide viewing characteristics .
  • LCD liquid crystal display
  • a conventional reflective type LCD usually employs a nematic liquid crystal, having a variety of related modes.
  • This reflective type LCD has shortcomings of slow response speed and narrow viewing angles.
  • an antiferroelectric LCD (AFLCD) which can be used as a large-sized liquid crystal display.
  • the conventionally provided antiferroelectric LCD is a transmission type which has wide viewing angles and fast response speed but requires a relatively high driving voltage and a backlight attached on the back surface thereof.
  • This transmission type antiferroelectric LCD is not suitable for portable display devices because its power consumption is considerably higher than the reflective type antiferroelectric LCD.
  • the reflective type color LCD which has gained significant attention in recent years includes a mirror attached to its back surface to use an external light instead of the backlight, in contrast to the conventional transmission type LCD having a backlight unit.
  • a reflective type LCD with a mirror consumes low power because of no attachment of the backlight and it is light-weight, being suitable for portable personal information terminal display devices.
  • This reflective type color LCD requires high brightness, high resolution and high contrast ratio, excellent gray scale capability and fast response time capable of achieving the video speed.
  • the early reflective type LCD has low brightness and low contrast ratio because it uses two polarizers.
  • the distance of the gap between the liquid crystal layer and reflecting plate produces the optical aberration that the incident light and the reflected light pass through different pixels. This leads to a fatal effect on the resolution and the color purity in the case of a color liquid crystal display.
  • a new reflective type color LCD which employs a single polarizer and includes an inner metal reflecting plate, a scattering thin film and a phase retardation film.
  • the proposed reflective type LCD has quite high brightness and high contrast ratio, its optical transmissivity greatly depends on the wavelength, the applied voltage, and the viewing angle. It has narrow viewing characteristics and slow response.
  • An antiferroelectric LCD of a transmission type which has been developing in recent years, is characterized by wider viewing angles and faster response speed than the conventional nematic LCD.
  • the response speed of the antiferroelectric liquid crystal is as short as tens to hundreds of ⁇ s while those of a thin film transistor (TFT) twisted nematic (TN)LCD and a passive matrix super-twisted nematic (STN)-LCD are as long as tens of ms .
  • TFT thin film transistor
  • STN passive matrix super-twisted nematic
  • the antiferroelectric liquid crystal has tristability with memory characteristic as well as fast response speed. With these properties, it is possible to realize a passive matrix driving mode LCD which does not employ the TFT, having an advantage of lower production cost than the TFT-LCD.
  • This passive matrix antiferroelectric LCD panel provides better contrast ratio and better picture quality than those of the STN-LCD panel when a similar passive matrix driving scheme is used.
  • the contrast ratio of the passive matrix antiferroelectric LCD is 30:1 to 50:1 while that of the STN-LCD is 10:1 to 20:1.
  • This higher contrast ratio of the passive matrix antiferroelectric LCD can be obtained by using the memory characteristics associated with the ferroelectric type switching.
  • the passive matrix antiferroelectric LCD When a voltage higher than a threshold voltage is applied to the antiferroelectric liquid crystal layer, the passive matrix antiferroelectric LCD enters an ON state and this state is maintained by its memory characteristics even if the voltage is removed.
  • the conventional twisted nematic LCD and STN-LCD vary their states when the voltage is reduced. For example, in case that they are black in the OFF state and white in the ON state, the white color is gradually changed to the black within the lapse of time as the voltage is lowered. This characteristic decreases the contrast ratio but provides the gray scale capability.
  • the gray scale capability is difficult to obtain because of its memory characteristics.
  • One of the key advantages of the antiferroelectric liquid crystal is the viewing angle of about 160° that is considerably wider as compared to 40° and 100° for the conventional nematic liquid crystal. This is because the average optic axes of the antiferroelectric liquid crystal molecules are located on the plane which is parallel to the surface of the glass substrates to achieve the ON/OFF states.
  • the antiferroelectric LCD has excellent characteristics which overcome the shortcomings of the conventional one, an antiferroelectric LCD which adopts the transmission type has been less attractive for portable applications so far because of high power consumption and relatively heavy weight.
  • the present invention is directed to a an antiferroelectric liquid crystal display of a reflective type that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide an antiferroelectric liquid crystal display of a reflective type which uses an antiferroelectric liquid crystal and employs a single polarizer and a phase retardation film, to accomplish high contrast, excellent brightness, fast response, and wide angle viewing characteristics.
  • the present invention is directed to an antiferroelectric liquid crystal display of a reflective type, with a first substrate on which a strip-shaped metal electrode serving as reflection plate are formed and an alignment film is coated thereon, and a second substrate on which strip-shaped transparent electrodes are formed and an alignment film film is coated thereon.
  • the transparent electrodes are arranged perpendicularly to the metal electrode, and an antiferroelectric liquid crystal is sealed between the first and second substrates whose surfaces on which the electrodes are formed are facing each other.
  • a phase retardation film is arranged on the surface of the second substrate, and a polarizer is formed on the phase retardation film.
  • the molecular tilt angle is preferably 45°, and 24.9° in the following embodiment of the present invention.
  • the multiplication of the thickness and optical anisotrophy (birefringence) of the antiferroelectric liquid crystal is preferably a quarter of the wavelength of incident light, and 2 ⁇ m in the preferred embodiment.
  • the optic axis of the phase retardation film is oriented to be ⁇ /4 with respect to that of the polarizer.
  • Fig. 1 is a perspective view of an antiferroelectric liquid crystal display of a reflective type according to the present invention
  • Figs. 2a - 2c illustrate the simulation results for the reflected intensity in terms of the antiferroelectric liquid crystal cell thickness and phase retardation of phase retardation film
  • Fig. 2a corresponding to the case of antiferroelectric phase where molecular tilt angles of 24.9° and -24.9° are alternated
  • Fig.2b corresponding to the case of ferroelectric phase having a molecular tilt angle of 24.9°
  • Fig.2c corresponding to the case of ferroelectric phase having a molecular tilt angle of -24.9°
  • Fig.3 is a graph showing the relation between the reflected light intensity and electric field
  • Fig.4 is a graph showing the relation between the reflected intensity and the time scale of the applied voltage.
  • Fig.5 shows the iso-contrast contours of the reflective AFCL cell.
  • the antiferroelectric LCD includes a first glass substrate 10 on which strip-shaped metal electrodes 20 serving as reflecting plates are formed and an alignment film 51 is coated thereon, and a second substrate 30 on which strip-shaped transparent electrodes 40 arranged perpendicularly to the metal electrode 20 are formed and an alignment film 50 is coated thereon.
  • metal electrodes 20 are arranged on the inner surface of first glass substrate 10 in the form of strips.
  • the metal electrodes 20 serve as electrodes and reflecting plates, and are able to prevent aberration because they are arranged just below the liquid crystal layer 60.
  • the first substrate 10 is preferably coated with a material with high reflectivity in order to keep the contrast ratio and resolution from deteriorating due to the low reflection of light incident on a region where the metal electrodes 20 are not formed.
  • the transparent electrodes 40 formed of, for example, indium tin oxide (ITO), are arranged on the second substrate 30, perpendicularly to the metal electrodes 20 formed on the first substrate 10.
  • an alignment material of a polyimide such as AL1051 of Japan Synthetic Rubber Co., is coated on the transparent electrodes 40 and rubbed in a predetermined direction, to form a parallel alignment film 50.
  • Spacers may be inserted between the first and second substrates 10 and 30 constructed as above to maintain the thickness between the two substrates at 2 m approximately, and antiferroelectric liquid crystal 60 is sealed between the two substrates.
  • the antiferroelectric liquid crystal preferably includes CS4001 of Chisso Petrochimcal Co.
  • the antiferroelectric liquid crystal 60 is aligned by the alignment film 50 coated on the second substrate 30 and the alignment film 51 coated on the first substrate 10.
  • This liquid crystal display has a polarization of -79.8nC/cm 2 and a molecular tilt angle of 24.9°.
  • a phase retardation film 70 is placed on the front of the antiferroelectric liquid crystal cell, i.e., the second substrate 30, and a polarizer 80 is formed thereon.
  • the optic axis of polarizer 80 is parallel to that of antiferroelectric liquid crystal 60.
  • the optic axis of phase retardation film 70 is oriented to be ⁇ /4 with respect to that of polarizer 80.
  • the phase retardation film 70 has a phase retardation corresponding to ⁇ /4 of the incident light, for example, 136nm in the case of incident light with a wavelength of 544nm.
  • the incident light that is passed through the polarizer has a linearly polarized state. This light becomes circularly polarized when passing through the quarter-wave phase retardation film.
  • the antiferroelectric state of the liquid crystal layer 60 makes the light optically inactive.
  • the light which is passed through the liquid crystal layer is then reflected by the metal electrodes, changing only the handedness of the circular polarization. That is, the left-handed circular polarization is changed to right-handed circular polarization, and vice versa.
  • the light reflecting from the metal electrodes pass through the liquid crystal layer and the phase retardation film again.
  • the circularly polarized light passes through the phase retardation film, it is changed to the linearly polarized light again but its polarization direction becomes perpendicular to that of the incident light which passed through the polarizer.
  • the polarization direction of the reflected light rotates by an angle of ⁇ /2 with respect to that of the incident light. Therefore, the LCD becomes dark because the reflected light cannot pass through the polarizer attached on its front surface .
  • the antiferroelectric liquid crystal layer has a predetermined magnitude of effective birefriengence when it is changed to the ferroelectric state under a voltage applied thereto.
  • a tunable optical effect appears depending on the magnitude of the effective phase retardation of the liquid crystal. If the phase retardation of the liquid crystal layer is ⁇ /4, identical to that of the phase retardation film, for example, both phase retardations of the liquid crystal layer and phase retardation film cancel each other. Accordingly, the polarization direction of the light remains unchanged, and the light is reflected in the linearly polarized state. Therefore, the reflected light passing through the liquid crystal layer and the phase retardation film is transmitted through the polarizer.
  • Fig.2 illustrates simulation results for the reflected intensity in terms of the antiferroelectric liquid crystal cell 5 thickness and phase retardation of phase retardation film.
  • Fig.2a corresponds to the case of antiferroelectric phase where molecular tilt angles of 24.9° and -24.9° are alternated.
  • Fig.2b corresponds to the case of ferroelectric phase having a molecular tilt angle of 24.9°.
  • Fig.2c corresponds to the case of 0 ferroelectric phase having a molecular tilt angle of -24.9°.
  • Figs.2a-2c show the results obtained by simulating the reflected intensity of the reflective type antiferroelectric liquid crystal cell of the present invention according to 2x2 Jones matrix mode.
  • the molecular tilt angle of antiferroelectric liquid 5 crystal is 24.9° and its birefringence is 0.088.
  • ⁇ 135.9nm and 271.8nm, corresponding to a quarter-wave and a half- C wave of 543.5nm, respectively.
  • ferroelectric (FO) phases of Figs. 2b and 2c show that the reflected intensity is 1, total reflection, at the intersection of the thickness of 2.3 ⁇ m and the wavelength of 135.9nm corresponding to the incident of the quarter-wave.
  • the 5 reflectivity is 0, zero reflection, in case of the antiferroelectric phase and 1, total reflection, in case of the ferroelectric phase, at the thickness of 2.3 ⁇ m and wavelength of 135.9nm.
  • a high contrast ratio can be achieved.
  • Fig. 3 is a graph showing the relation between the reflected 0 light intensity and the applied electric field.
  • the solid line shows simulation results and dots show experimental results.
  • the reflected light intensity slightly increases below the threshold ( ⁇ 9V/ ⁇ m), which is known as the pretransitional effect, and steeply increases above the threshold.
  • the bright state was achieved at above 10V/ m. This demonstrates that the bistable switching between the bright and dark states is undergone through the field-induced AF-FO phase transition. In the case that an antiferroelectric liquid crystal having the high pretransitional effect is used, a limited gray scale capability can be obtained.
  • Fig. 4 is a graph showing the relation between the reflected light intensity and the time scale of the applied voltage.
  • the LCD according to the present invention has the response time of 0.34ms for changing from the dark state to the bright state and 4.72ms for changing from the bright state to the dark state in the presence of the applied voltage. Accordingly, it has fast response capable of realizing video-rate applications.
  • Fig. 5 shows the iso-contrast contours of the reflective AFCL cell. This result shows symmetric and wide viewing characteristics.
  • the maximum contrast ratio is about 5:1 under a white illuminating light source.
  • the contrast ratio can be further enhanced by using optimized cell parameters and better LC alignment.
  • the present invention uses a single polarizer and a phase retardation film to realize the reflective type antiferroelectric liquid crystal display, accomplishing high contrast, wide viewing angle and fast response characteristics. Accordingly, a display device that is lightweight and has low power consumption can be provided, being suitable for portable display devices. It will be apparent to those skilled in the art that various modifications and variations can be made in the reflective type antiferroelectric liquid crystal display of the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)

Abstract

L'invention se rapporte à un afficheur à cristaux liquides anti-ferroélectriques de type réflectif, comportant un premier substrat sur lequel sont formées des électrodes métalliques en forme de bandes utilisées comme plaques de réflexion, lesdites électrodes étant recouvertes d'un film d'alignement, un second substrat sur lequel sont formées des électrodes transparentes en forme de bandes, lesdites électrodes étant recouvertes d'un film d'alignement, et lesdites électrodes transparentes étant disposées perpendiculairement aux électrodes métalliques, un cristal liquide anti-ferroélectrique enfermé hermétiquement entre lesdits premier et second substrats dont les surfaces pourvues d'électrodes sont opposées, un film introduisant un retard de phase qui est attaché à la face externe du second substrat, et un polariseur formé sur le film introduisant un retard de phase.
PCT/KR2000/001265 1999-11-05 2000-11-04 Afficheur a cristaux liquides anti-ferroelectriques de type reflectif WO2001033291A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11774/01A AU1177401A (en) 1999-11-05 2000-11-04 Antiferroelectric liquid crystal display for a reflective type

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KR1019990048984A KR100358475B1 (ko) 1999-11-05 1999-11-05 반사형 반강유전성 액정 표시장치
KR1999/48984 1999-11-05

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Publication number Priority date Publication date Assignee Title
KR100976623B1 (ko) * 2006-09-08 2010-08-18 주식회사 엘지화학 반사형 편광판을 사용한 거울형 액정 디스플레이 장치
KR101029671B1 (ko) * 2009-04-13 2011-04-18 서울대학교산학협력단 수직 배향된 나선변형 강유전성 액정 및 다중 전극 구조를 이용한 액정 표시 장치 및 그 제조 방법

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06130425A (ja) * 1992-10-15 1994-05-13 Nippondenso Co Ltd 液晶表示素子
JPH08136913A (ja) * 1994-11-11 1996-05-31 Matsushita Electric Ind Co Ltd 反射型反強誘電性液晶表示装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2798073B2 (ja) * 1996-10-21 1998-09-17 日本電気株式会社 反射型液晶表示装置
JPH11249179A (ja) * 1998-02-27 1999-09-17 Casio Comput Co Ltd 液晶表示素子

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06130425A (ja) * 1992-10-15 1994-05-13 Nippondenso Co Ltd 液晶表示素子
JPH08136913A (ja) * 1994-11-11 1996-05-31 Matsushita Electric Ind Co Ltd 反射型反強誘電性液晶表示装置

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AU1177401A (en) 2001-05-14
KR100358475B1 (ko) 2002-10-25

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