MANUFACTURING METHOD OF LIQUID CRYSTAL ORIENTATION FILM, LIQUID CRYSTAL ORIENTATION FILM AND LIQUID CRYSTAL DISPLAY

• Main Authors: GOTO KOHEI, SUZUKI KANAKO, IIZUKA YUTA
• Format: Patent
• Language: English; Japanese
• Published: 19.03.2024
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; THEIR PREPARATION OR CHEMICAL WORKING-UP

To provide a manufacturing method of forming a plurality of areas having different orientation directions (orientation division) and thereby easily forming a VA mode liquid crystal display element excellent in field of view angle.SOLUTION: The manufacturing method of multi-domain liquid crystal orientation film includes: a step of applying on a substrate liquid crystal orientation agent that contains polymer including optical orientation group and thermal cross-linking group A as component (A) and solvent, and satisfies at least one of the following Z1 and Z2, to form a cured film; a first irradiation step of irradiating the cured film with ultraviolet from an oblique direction; and a second irradiation step of irradiating the cured film subjected to the ultraviolet irradiation with ultraviolet from a direction different from the first irradiation step, in this order. At least one of the irradiation steps is performed via a mask including a light-shielded area and a not light-shielded area. Z1: the component (A) further contains thermal cross-linking group B. Z2: the component (B) further contains compound containing thermal cross-linking group B.SELECTED DRAWING: Figure 1 【課題】本発明は、配向方向が異なる領域を複数形成（配向分割）し、視野角特性に優れたＶＡモード液晶表示素子の簡便な製造方法を提供する。【解決手段】本発明は、（Ａ）成分として光配向性基と熱架橋性基Ａとを有する重合体及び溶媒を含有するとともに、下記Ｚ１及びＺ２の少なくとも一方を満たす液晶配向剤を基板上に塗布し、硬化膜を形成する工程、当該硬化膜に紫外線を斜め方向から照射する１回目の照射工程、並びに、当該紫外線照射後の硬化膜に、当該１回目の照射工程とは異なる方向から紫外線照射を行う２回目の照射工程をこの順番で含み、当照射工程の少なくとも一方は、遮光された領域と遮光されていない領域とを含むマスクを介して行われる、マルチドメイン液晶配向膜の製造方法。Ｚ１：（Ａ）成分が、熱架橋性基Ｂをさらに有する。Ｚ２：（Ｂ）成分として、熱架橋性基Ｂを有する化合物をさらに含有する【選択図】図１