Liquid crystal display device

Abstract

A liquid crystal device comprises at least a pair of substrates; and a liquid crystal material composition disposed between the pair of substrates. The liquid crystal material composition comprises, at least, a Smectic phase liquid crystal material, and a molecular alignment-enhancing agent. The Smectic phase liquid crystal material has a molecular long axis or n-director having a tilt angle to its layer normal as a bulk material, and the molecular long axis of the Smectic phase liquid crystal material aligns parallel to the pre-setting alignment direction, resulting in its long axis layer normal. The molecular alignment-enhancing agent has a molecular axis or n-director having no tilt angle to its layer normal as a bulk material, and the molecular alignment-enhancing agent has a double bond structure in its molecule.

Description

technical field

[0001] The present invention relates to a liquid crystal display device using polarization shielded (Polarization Shielded) smectic (hereinafter referred to as "PSS") liquid crystal or PSS liquid crystal material, which is especially suitable for display devices for full-motion video images. Background technique

[0002] The recent increase in liquid crystal display (LCD) application areas manifests itself in many varieties, such as advanced cell phone displays, networked personal digital assistants (PDAs), computer monitors, and large screen direct-view TVs. Emerging increases in these application areas are based on recent improvements in LCDs in their performance and their manufacturability.

[0003] On the other hand, new flat panel display technologies such as organic light emitting displays (OLEDs) and plasma display panels (PDPs) have been accelerated in their development and manufacturing to compete with LCDs. Furthermore, the introduction of LCDs to ...

Examples

Embodiment approach

[0092] In a preferred embodiment of the present invention, the liquid crystal device may preferably comprise at least one pair of substrates; and a smectic phase liquid crystal material arranged between the pair of substrates, the smectic phase liquid crystal material as a bulk material uses Its molecular long axis is aligned with an inclination angle to its layer normal, wherein the substrate surface has a strong enough azimuthal anchoring energy to align the molecular long axis of the smectic liquid crystal material parallel to the preset alignment direction, so that it The long axis of the molecule is perpendicular to its layer.

[0093] (determination of sufficiently strong azimuthal anchoring energy)

[0094] In the present invention, the aforementioned sufficiently strong azimuthal anchoring energy can be determined by confirming that the molecular long axis of the smectic liquid crystal material is aligned parallel to the preset alignment direction so that its molecular...

Embodiment 1

[0244] (this invention)

[0245] Preparation of self-made smectic C-phase liquid crystal mixture material. The main molecular structure of the mixture is as follows:

[0246]

[0247] The prepared non-spontaneously polarized smectic liquid crystal mixture was doped with 3 wt% of materials with the following molecular structures. This entire mixture filled the sample panels made as described below.

[0248]

[0249] This particular doped material was made by the following synthetic route.

[0250]

[0251] After mixing, the phase sequence of the mixture as a bulk material was measured by using "hotstage" (model: HCS 206) manufactured by Instec: Colorado corporation and a polarizing microscope manufactured by Nikon: Japanese corporation. The mixture exhibits a smectic C phase as a bulk morphology at room temperature. The smectic C phase shows that the molecular director is tilted relative to the normal direction of the smectic layer, so that the extinction angle under...

Embodiment 2

[0258] (comparison)

[0259] Mixtures with little spontaneous polarization were made using commercially available two-bottle system FLC mixture materials (Merck: ZLI-4851-000 and ZLI-4851-100) and chiral materials opposite to those of the FLC mixtures. The resulting mixture contained 75 wt% ZLI-4851-000, 20 wt% ZLI-4851-100 and 5 wt% of the opposite chiral material. As for the alignment material of liquid crystal molecules, RN-1199 (Nissan Chemicals Industries) was used as the alignment material with a pretilt angle of 1-1.5 degrees. The thickness of the alignment layer as the cured layer is set to 1,000A-1,200A. The surface of the cured alignment layer was polished by a rayon cloth in a direction 30 degrees from the centerline of the substrate. The contact length for polishing on both substrates was set at 0.4 mm. Silica spheres with an average diameter of 1.6 μm were used as spacers. The resulting panel gap was measured to be 1.8 μm. The above mixed material was injecte...

technical field

[0001] The present invention relates to a liquid crystal display device using polarization shielded (Polarization Shielded) smectic (hereinafter referred to as "PSS") liquid crystal or PSS liquid crystal material, which is especially suitable for display devices for full-motion video images. Background technique

[0002] The recent increase in liquid crystal display (LCD) application areas manifests itself in many varieties, such as advanced cell phone displays, networked personal digital assistants (PDAs), computer monitors, and large screen direct-view TVs. Emerging increases in these application areas are based on recent improvements in LCDs in their performance and their manufacturability.

[0003] On the other hand, new flat panel display technologies such as organic light emitting displays (OLEDs) and plasma display panels (PDPs) have been accelerated in their development and manufacturing to compete with LCDs. Furthermore, the introduction of LCDs to ...

Examples

Embodiment approach

[0092] In a preferred embodiment of the present invention, the liquid crystal device may preferably comprise at least one pair of substrates; and a smectic phase liquid crystal material arranged between the pair of substrates, the smectic phase liquid crystal material as a bulk material uses Its molecular long axis is aligned with an inclination angle to its layer normal, wherein the substrate surface has a strong enough azimuthal anchoring energy to align the molecular long axis of the smectic liquid crystal material parallel to the preset alignment direction, so that it The long axis of the molecule is perpendicular to its layer.

[0093] (determination of sufficiently strong azimuthal anchoring energy)

[0094] In the present invention, the aforementioned sufficiently strong azimuthal anchoring energy can be determined by confirming that the molecular long axis of the smectic liquid crystal material is aligned parallel to the preset alignment direction so that its molecular...

Embodiment 1

[0244] (this invention)

[0245] Preparation of self-made smectic C-phase liquid crystal mixture material. The main molecular structure of the mixture is as follows:

[0246]

[0247] The prepared non-spontaneously polarized smectic liquid crystal mixture was doped with 3 wt% of materials with the following molecular structures. This entire mixture filled the sample panels made as described below.

[0248]

[0249] This particular doped material was made by the following synthetic route.

[0250]

[0251] After mixing, the phase sequence of the mixture as a bulk material was measured by using "hotstage" (model: HCS 206) manufactured by Instec: Colorado corporation and a polarizing microscope manufactured by Nikon: Japanese corporation. The mixture exhibits a smectic C phase as a bulk morphology at room temperature. The smectic C phase shows that the molecular director is tilted relative to the normal direction of the smectic layer, so that the extinction angle under...

Embodiment 2

[0258] (comparison)

[0259] Mixtures with little spontaneous polarization were made using commercially available two-bottle system FLC mixture materials (Merck: ZLI-4851-000 and ZLI-4851-100) and chiral materials opposite to those of the FLC mixtures. The resulting mixture contained 75 wt% ZLI-4851-000, 20 wt% ZLI-4851-100 and 5 wt% of the opposite chiral material. As for the alignment material of liquid crystal molecules, RN-1199 (Nissan Chemicals Industries) was used as the alignment material with a pretilt angle of 1-1.5 degrees. The thickness of the alignment layer as the cured layer is set to 1,000A-1,200A. The surface of the cured alignment layer was polished by a rayon cloth in a direction 30 degrees from the centerline of the substrate. The contact length for polishing on both substrates was set at 0.4 mm. Silica spheres with an average diameter of 1.6 μm were used as spacers. The resulting panel gap was measured to be 1.8 μm. The above mixed material was injecte...

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