Liquid crystal element, optical path-deflecting element and image display device
A liquid crystal element and a technology for the element, which is applied in the field of image display devices and can solve problems such as characteristic degradation
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specific Embodiment approach 1-1
[0101] First of all, specific embodiment 1-1 is characterized in that it contains at least a chiral compound of general formula (1-I)
[0102]
[0103] In formula (1-I), R 1 It is an alkyl or alkenyl group with 1-15 carbons, one carbon of which may be replaced by -CN, or at least one H of which may be replaced by F or Cl. Moreover, its CH 2 A group may be replaced by -O-, -CO-, -O-CO-, -CO-O- or -O-CO-O-. Moreover, A 2 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, 1,3,4-thiadiazole-2,5-diyl or 1,2,4- Thiadiazole-3,5-diyl, one or two hydrogen atoms of which may be replaced by F. Z 1 and Z 2 Each is independently -CO-O-, -O-CO- or a single bond. Also, m=1 or 2 and 1≦l≦9.
[0104] And, preferably the chiral compound of general formula (1-I) is the compound of following formula (1-II)
[0105]
[0106] In formula (1-II), A 3 and A 4 Each is independently selected from 1,4-phenylene, pyridine-2,5-diyl and pyrimidine-2,5-diyl, one or two hydrogen atoms of w...
specific Embodiment approach 1-2
[0110] Specific embodiment 1-2 is characterized in that the chiral compound of formula (1-II) in specific embodiment (1-1) is the compound of following formula (1-III)
[0111]
[0112] In formula (1-III), R 3 It is an alkyl or alkenyl group with 1-15 carbon atoms, and 1≤l≤9. Although the reason for this is not fully understood, the helical pitch of the chiral smectic C phase can be appropriate to stabilize its orientation, and thus no orientation defects can be obtained even for a liquid crystal cell having a thick liquid crystal layer with a homeotropic orientation Rather, it has a well-oriented liquid crystal layer.
specific Embodiment approach 1-3
[0114] Embodiment (1-3) is embodiment (1-1) or embodiment (1-2) in which the base liquid crystal material contains at least one compound having a phenylpyrimidine skeleton.
[0115] Phenylpyrimidine compounds can provide crystal phase sequence of isotropic liquid phase, nematic phase, smectic A phase and smectic C phase from high to low temperature, and especially can provide smectic phase stable at room temperature or near room temperature Phase C. Therefore, a liquid crystal element capable of forming a stable ferroelectric liquid crystal layer within an operating temperature range can be provided.
[0116] Here, as a preferable example of the compound having a phenylpyrimidine skeleton, a compound of the following formula (1-a) can be provided
[0117]
[0118] and (1-b) below.
[0119]
[0120] In formulas (1-a) and (1-b), R 4 and R 5Each is a straight-chain or branched-chain alkyl or alkenyl group with a carbon number of 3-15, at least one H of which can be repl...
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Abstract
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