39 results about "Ferroelectric liquid crystal display" patented technology

A ferroelectric liquid crystal display including an upper base plate and a lower base plate which are disposed apart from each other at a predetermined distance, electrode layers respectively formed on the upper base plate and the lower base plate facing each other, orientation layers respectively formed on the electrode layers and treated by rubbing in a first rubbing direction and a second rubbing direction which intersect at a predetermined angle, and a liquid crystal layer disposed between the orientation layers and filled with a ferroelectric liquid crystal having a bookshelf structure. Due to the ferroelectric liquid crystal display and the method of manufacturing the same, the ferroelectric liquid crystal of the bookshelf structure can stably twist by the treatment of the orientation such that an afterimage phenomenon is prevented and further a low threshold voltage and a bistability can be obtained.

A ferroelectric liquid crystal display having alignment films with different surface polarities. The alignment films induce an internal electric field through the liquid crystal. Because of the induced internal electric field, initial liquid crystal alignment, and subsequent liquid crystal alignments, can be performed without an externally applied electric field.

The present invention relates to a ferroelectric liquid crystal composition and a ferroelectric liquid crystal display element.

The present invention provides a ferroelectric liquid crystal composition and a ferroelectric liquid crystal display element using this ferroelectric liquid crystal. The ferroelectric liquid crystal composition of the present invention contains at least one liquid crystal compound and has a chiral smectic C phase, and when the ferroelectric liquid crystal composition is sandwiched between substrates, a layer normal direction of the chiral smectic C phase is 80° to 90° with respect to the substrate surface.

According to the ferroelectric liquid crystal composition and the ferroelectric liquid crystal display element of the present invention, since an alignment restoring ability is excellent, the present invention is useful for application in which a pressing force is repeatedly applied.

A liquid crystal display device utilizing a ferroelectric liquid crystal, e.g., a chiral smectic liquid crystal aligned to establish two bi-stable display states. The display device is driven in a time-sharing mode. The change of the bi-stable display states is effected by applying a selected voltage to the changed ferro-electric liquid crystal. Thereafter the display state is held by applying an A.C. pulse voltage.

An aligning method of a ferroelectric liquid crystal display includes; disposing a first mask and a second mask, each of which has opening regions and blocking regions arranged in alternating fashion in vertical direction and horizontal direction corresponding to liquid crystal cells of the liquid crystal display; and injecting a ferroelectric liquid crystal material within the liquid crystal panel.

A method of driving a ferroelectric liquid crystal display with improved brightness while providing DC compensation. The method includes applying a data voltage, a compensation voltage, and a common voltage to each display pixel in each frame so as to selectively drive the liquid crystals, wherein the compensation voltage has a polarity (referenced to the common voltage) that is opposite the data voltage. The data voltage is applied for a longer period of time than the compensation voltage, but the magnitude of the compensation voltage is greater than the magnitude of the data voltage (when both are referred to the common voltage).

A method of aligning Half V-Switching Mode ferroelectric liquid crystal material in the presence of an applied electric field, a driving method, and an apparatus for driving a ferroelectric liquid crystal display using the same has a high response speed characteristics and a wide viewing angle characteristics. The liquid crystal material has a small capacitance, C, and is driven according to a double frequency column inversion driving method operating at about 120 Hz to display a picture.

A ferroelectric liquid crystal display and a fabricating method thereof that is capable of maintaining a stable alignment state against external temperature variation and external impact. In the method and apparatus, a ferroelectric liquid crystal containing a small amount of light-hardening polymer is injected between upper and lower substrates provided with alignment film. An ultraviolet ray is irradiated thereon to form a polymer network. The ultraviolet ray has a light intensity range of about 1 to about 5 mW/cm2, and has a light energy range of about 240 to about 1200 mJ/cm2.

A ferroelectric liquid crystal display and method of driving the same according to an impulse-type method improves a voltage holding ratio. The ferroelectric liquid crystal display and method of driving the same applies a scan pulse at least twice to each gate line of a liquid crystal display panel injected with ferroelectric liquid crystal material during one frame period of the liquid crystal display panel. Data voltages are applied to data lines of liquid crystal display panel in synchrony with the scan pulse.

The present invention discloses a reflective type ferroelectric liquid crystal display and a driving method thereof. The reflective type ferroelectric liquid crystal display comprises a display panel which is disposed between a polarization beam splitter and a mirror to satisfy a quarter plate condition, and in which a liquid crystal layer formed between electrode layers is filled with half-V type ferroelectric liquid crystal having a bookshelf structure, the electrode layers being disposed between substrates to be orthogonal and opposite to each other; and a compensation panel which is disposed between the display panel and the polarization beam splitter to satisfy a half plate condition, and in which a liquid crystal layer formed between electrode layers is filled with half-V type ferroelectric liquid crystal having a bookshelf structure, the electrode layers being disposed between substrates to be opposite to each other. Therefore, the light loss can be reduced, and thus the gray scale display can be improved.

A ferroelectric liquid crystal display element holds a ferroelectric liquid crystal between a pair of substrates. A driving scheme includes a reset period having a switching period and a non-switching period which precede application of a selection pulse. During the switching period, a voltage exceeding a threshold voltage required to switch the ferroelectric liquid crystal is applied irrespective of the display data to be written to a pixel, and during the non-switching period, an ion electric field in the ferroelectric liquid crystal is aligned in such a direction that cancels the direction of an electric field produced by spontaneous polarization of the liquid crystal molecules. A voltage not exceeding the threshold voltage of the ferroelectric liquid crystal, preferably a voltage of 0 V, that is, no voltage, is applied during the non-switching period.

An antiferroelectric liquid crystal display comprises: an antiferroelectric liquid crystal display element which includes an antiferroelectric liquid crystal that is sandwiched between a pair of substrates having a plurality of scanning electrodes and signal electrodes deposited respectively on the opposing surfaces thereof; and a light source which successively emits a plurality of different colors of light. In the thus constructed antiferroelectric liquid crystal display, a scanning period (TS) during which the light source emits light of one of the plurality of colors is divided into two periods, of which the first period (SC1) includes a selection period for determining a display state and a non-selection period for holding therethrough the display state selected during the selection period, and the second period (SC2), constituting the remainder of the scanning period, includes a selection period for forcing the display state into a black display state and a non-selection period for holding therethrough the black display state selected during the selection period.

The invention discloses a perfluoroalkyl acyloxo biphenyl liquid crystal compound with a terminal group containing an aliphatic hydrocarbon chain, which is shown in a structural general formula, wherein Rf is CF3(CF2)nCOO-; Rh is CyH2y+z(CO)mO-; n is equal to 6 to 8; m is equal to 0 or 1; y is equal to 3 to 10; z is equal to 1 or -1; and when z is equal to -1, the aliphatic hydrocarbon chain in the Rh is an unsaturated aliphatic hydrocarbon chain of which the tail end is a double-bond. The structure of the perfluoroalkyl acyloxo biphenyl liquid crystal compound with the terminal group containing the aliphatic hydrocarbon chain of the invention has no chiral atoms and a simple preparation method. In the liquid crystal compound of the invention, one end of biphenylyl contains the aliphatic hydrocarbon chain, while the other end is perfluoroalkyl acyloxy; and the liquid crystal compound has no other spacer groups between a perfluorocarbon chain and a liquid crystal core, structurally has no chiral atoms and simple preparation method, displays spirally smectic C phase, and has the characteristics of wide liquid crystal phase range, high stability and the like, and wide application prospect in the field of ferroelectric liquid crystal display.

An antiferroelectric liquid crystal panel, having an antiferroelectric liquid crystal between a pair of substrates, which comprises a driving circuit adapted to output a layer structure controlling voltage waveform having a frequency of 1 Hz to 100 Hz and a voltage in the range of +10 V to +50 V or −10 V to −50 V, for an optional length of time.

A pressure sealing apparatus and method for a ferroelectric liquid crystal display is disclosed for improving an alignment characteristic of a liquid crystal. In the apparatus and method, simultaneously with a pressurization of a liquid crystal display panel into which a liquid crystal has been injected, the liquid crystal display panel is subjected to a temperature treatment along with an application of an electric field.

The invention relates to a novel reflective, ferroelectric display which can be actuated without DC voltage and has a maximum switching angle alpha which is +-22.5 DEG C. The liquid crystal display according to the invention is distinguished in particular by the fact that a further birefringent element is arranged between the two plates bounding the birefringent liquid crystal layer. In a first category of liquid crystal displays according to the invention, this additional birefringent element is a transparent plate having an optical path difference DELTAn.d PRG lambd/4, which is arranged after the liquid crystal layer in the direction of the light incidence, in particular between said layer and the mirror.

A liquid crystal display cell, and a fabricating method thereof, that incorporates a light-cured monomer in a ferroelectric liquid crystal. By injecting the light-cured monomer/ferroelectric liquid crystal between substrate while in a nematic phase or isotropic phase, by performing DC voltage treatments as the liquid crystal temperature decreases, and by performing a light irradiation treatment, a stable, aligned ferroelectric liquid crystal cell is produced. Such a ferroelectric liquid crystal cell can reduce flicker and can be realigned after a physical shock.

A method of driving an anti-ferroelectric liquid crystal display (LCD) panel is provided that provides uniform transmittance display characteristics. In the anti-ferroelectric LCD panel, signal electrode lines are arranged in parallel above anti-ferroelectric liquid crystal cells, and at least first and second scan electrode lines are arranged below the anti-ferroelectric liquid crystal cells perpendicular to the signal electrode lines. The method includes a first driving step and a second driving step, which are repeated. Each of the first and second driving steps includes a scanning step, an inversion step, and an iteration step. In the scanning step, a scan selection voltage is applied to the first scan electrode line, and simultaneously, display data signals are applied to the signal electrode lines. In the inversion step, a sustain voltage is applied to the first scan electrode line, and simultaneously, inverted signals of the display data signals which have been applied during the scanning step are applied to the signal electrode lines. In the iteration step, the scanning and inversion steps are repeatedly performed with respect to the second scan electrode line and all of the signal electrode lines.