A liquid crystal alignment agent and a preparation method thereof, a liquid crystal alignment film and a preparation method thereof, and a liquid crystal cell are provided. A piperazine monomer is added to a liquid crystal alignment agent, a bulk resistance value and a surface resistance value of a liquid crystal alignment agent material can be reduced, and the ability of the liquid crystal alignment agent material to release residual charges can be effectively improved, thereby increasing the reliability and stability of an electronic product. The liquid crystal cell using the liquid crystal alignment agent has advantages such as high voltage holding ratio (VHR) and low residual voltage.

The present application relates to a liquid crystal aligning agent, a liquid crystal alignment film and a method for producing the same, as well as a liquid crystal display device. The liquid crystal aligning agent comprises (i) a first polyamic acid having a photoreactive group without a liquid crystal group; (ii) a second polyamic acid having a liquid crystal group without a photoreactive group; (iii) a third polyamic acid having both a liquid crystal group and a photoreactive group; (iv) a fourth polyamic acid having neither a photoreactive group nor a liquid crystal group. The liquid crystal display device using the liquid crystal alignment film formed by the liquid crystal aligning agent provided by the present disclosure has a high display contrast and an improved AC residual image.

A method of fabricating an electrically-controlled birefringence cell. The cell has a cell gap no more than 20 micrometers. The cell has an alignment layer arranged to impart a pretilt on liquid crystal in contact with the alignment layer. The method comprises processing the alignment layer to achieve a surface anchoring value between the liquid crystal and alignment layer of less than 1 mJ/m.sup.2.

A liquid crystal photo-alignment agent includes a polyimide copolymer including a first structure unit represented by the described Chemical Formula 1 and a second structure unit represented by the described Chemical Formula 2, and, based on a 100 mole % sum total of the first structure unit and the second structure unit, the first structure unit is included in an amount of 70 to 95 mole % and the second structure unit is included in an amount of 5 to 30 mole %. A liquid crystal photo-alignment film may be manufactured using the same, and a liquid crystal display may include the liquid crystal photo-alignment film.

The present invention provides a liquid crystal display device in which display unevenness is suppressed by preventing degradation of TFT characteristics due to photo-alignment treatment. The liquid crystal display of the present invention includes: a thin-film transistor substrate; and a liquid crystal layer, the thin-film transistor substrate including a thin-film transistor having a channel etch structure and an alignment film, the thin-film transistor including a gate electrode, a gate insulating film, a channel layer containing an oxide semiconductor, and a pair of a source electrode and a drain electrode in the stated order, the alignment film including at least one selected from the group consisting of a cinnamate structure, a chalcone structure, an azobenzene structure, a stilbene structure, a coumarin structure, and a phenyl ester structure.

An optically active structure and a display device are presented. The device utilized an optically active structure comprising liquid crystal material and a plurality of nanorods configured to emit light in one or more predetermined ranges in response to pumping light. Variation in orientation of the liquid crystal varies orientation of the nanorods and modulated light emission therefrom.

An embodiment of the present invention discloses a polyimide coating method, which includes the following steps: providing a glass substrate and at least one nozzle; applying the nozzle to a polyimide solution onto the glass substrate to form a polyimide film; and moving the glass substrate to have the glass substrate pass through a roller that includes a printing plate so that the roller that includes the printing plate shapes the polyimide film uniformly distributed on the glass substrate to have a surface of the polyimide film formed on the glass substrate uniform and flat. The present invention also provides a polyimide coating device. The polyimide coating method and device of the present invention shorten coating time of polyimide, increase coating efficiency, and reduce coating cost.

The present disclosure discloses a method for manufacturing a display panel, a display panel and a display device, the display panel comprising a first substrate and a second substrate, a polyimide film being formed on both of the first substrate and the second substrate, wherein the method for manufacturing a display panel comprises: aligning the polyimide film on one of the first substrate and the second substrate using a rubbing alignment process, aligning the polyimide film on the other substrate using an optical alignment process. The method for manufacturing a display panel of the present disclosure uses the rubbing alignment process and the optical alignment process simultaneously so as to improve the display quality of the display panel effectively and avoid shortcomings of a certain performance when using one of the alignment processes separately.

A liquid crystal display including a first substrate, a thin film transistor disposed on the first substrate, a first electrode connected to the thin film transistor, and a first alignment layer disposed on the first electrode, wherein the first alignment layer includes polyimide and a capping group connected to a main chain end of the polyimide, and the capping group contains at least one of a first compound represented by the following Chemical Formula 1, and a second compound represented by the following Chemical Formula 2: ##STR00001## A1 and A2 are, independently of each other, an aromatic compound having 4 to 20 carbon atoms or an aliphatic cyclic compound having 4 to 20 carbon atoms; and B1 and B2 are, independently of each other, a crosslinking reaction group containing an alkylene group (—C.sub.nH.sub.2n—, n is a natural number).

The present invention provides a functional material, its preparation method, an alignment material and a liquid crystal substrate, which belong to the display technical field and can solve the problem that current liquid crystal display devices will produce pollution. The functional material of the present invention comprises an inorganic powder whose surface has a modified layer, wherein the inorganic powder comprises any one or more of aluminum oxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, titanium dioxide, boron oxide, diiron trioxide, calcium oxide, potassium oxide, sodium oxide and lithium oxide; the modified layer is generated via cyclization by dehydrating the reaction product of a dianhydride and a diamine. The alignment material of the present invention comprises the above functional material. The liquid crystal display substrate of the present invention comprises an alignment layer made from the above alignment material.