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A technology of liquid crystal and components, which is applied in the field of transmission and scattering liquid crystal display components, and can solve problems such as increased power consumption
Active Publication Date: 2018-01-02
NISSAN CHEM IND LTD
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However, since the standard type element needs to constantly apply a voltage in order to obtain a transmissiv...
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[0348] The following examples are given to illustrate the present invention in more detail, but the present invention is not limited to these examples.
[0349]
[0350] The meanings of the abbreviations of the compounds and the like used below are as follows.
[0351]
[0352]
[0353] (Liquid crystal) L1: MLC-6608 (manufactured by MERCK CORPORATION)
[0395]D2 (6.89g, 27.5mmol), A1 (8.49g, 22.3mmol) and C2 (2.26g, 14.9mmol) were mixed in NMP (38.9g), and after reacting at 50°C for 5 hours, D1 (1.80g , 9.18mmol) and NMP (19.5g), reacted at 40°C for 6 hours to obtain a resin solid content concentration of 25% by mass (hereinafter referred to as C R 25%) of polyamic acid solution (1). The number average molecular weight (Mn) of this polyamic acid was 21300, and the weight average molecular weight (Mw) was 67700.
Synthetic example 2
[0397] After adding NMP to the polyamic acid solution (1) (30.0 g) obtained in Synthesis Example 1 and diluting to 6% by mass, acetic anhydride (2.50 g) and pyridine (2.40 g) were added as an imidation catalyst, The reaction was carried out at 50° C. for 3 hours. This reaction solution was poured into methanol (460 ml), and the obtained precipitate was collected by filtration. This deposit was wash|cleaned with methanol, it dried under reduced pressure at 100 degreeC, and the polyimide powder (2) was obtained. The imidization rate of this polyimide was 55%, Mn was 19,000, and Mw was 50,200.
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Abstract
Provided is a liquid crystal display element which has high liquid crystal vertical alignment properties, good optical characteristics, and high adhesion between a liquid crystal layer and a liquid crystal alignment film, and the liquid crystal display element can maintain the characteristics thereof for a long period of time even in an environment where the element is exposed to high temperaturesand high humidities or exposed to light. The liquid crystal display element is provided with a liquid crystal alignment film that has a liquid crystal layer obtained by ultraviolet irradiation of a liquid crystal composition which contains a polymerizable compound and liquid crystals and which is disposed between a pair of substrates provided with electrodes, the liquid crystal alignment film being configured so that at least one of the substrates is aligned perpendicularly to the liquid crystals. The liquid crystal alignment film is obtained from a liquid crystal alignment agent that contains component (A) and component (B). Component (A): At least one compound selected from among the group consisting of a compound represented by formula [1-1] and a compound represented by formula [1-2].Component (B): A polymer having at least one structure selected from among the group consisting of formula [2-1] and formula [2-2].
Description
technical field [0001] The present invention relates to a transmission-scattering type liquid crystal display element which exhibits a transparent state when no voltage is applied and a scattering state when voltage is applied. Background technique [0002] The TN mode has already been put into practical use as a liquid crystal display element using a liquid crystal material. In this mode, light is switched using the optical rotation characteristics of the liquid crystal, and a polarizing plate is required when used as a liquid crystal display element. However, light utilization efficiency becomes low due to the use of polarizers. [0003] As a liquid crystal display element with high light utilization efficiency without using a polarizing plate, there is a liquid crystal display element that switches between a transmissive state (also called a transparent state) and a scattering state of the liquid crystal. Liquid crystal display elements of molecular dispersed liquid cry...
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