Liquid crystal display device
A technology of liquid crystal display device and liquid crystal layer, which is applied in the directions of instruments, optics, nonlinear optics, etc.
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Embodiment approach 1）
[0104] The liquid crystal display device of this embodiment has a structure in which a liquid crystal layer containing liquid crystal molecules is sandwiched between a pair of substrates, and at least one of the pair of substrates has an alignment film on the side of the liquid crystal layer.
[0105] Moreover, the said alignment film contains the liquid crystal alignment polymer which has the characteristic which performs alignment control of the said liquid crystal molecule.
[0106] In addition, the alignment film is formed by applying a liquid crystal aligning agent containing a first constituent material that is a material of the liquid crystal alignment polymer to at least one of the pair of substrates.
[0107] In addition, the surface side chain density represented by the above formula is 2.0 or more.
[0108] The concentration on the outermost surface is the concentration of side chain index atoms on the surface of the alignment film, and is measured by X-ray photoele...
Embodiment 1）
[0320] First, two glass substrates having a transparent electrode made of ITO and having a thickness of 0.7 mm were prepared.
[0321] Next, synthesize the above-mentioned copolymer of diamine and acid anhydride with photofunctional groups, as the first constituent material, prepare the polyimide (partially polyimide) with an imidization rate of 46% and a side chain concentration based on the molecular structural formula of 8.9. imine). Such as image 3 As shown, the copolymer has repeating units comprising anhydride units and diamine units with side chains 21a. The side chain 21a shows vertical alignment and has a photofunctional group. In addition, fluorine is introduced into the side chain 21a, and a fluorine atom is used as a side chain index atom. That is, fluorine atoms are contained only in the side chain 21a. The molecular formula of the repeating unit containing the main chain structure of polyamic acid is C 39 h 33 N 2 o 10 f 5, therefore, the side chain con...
Embodiment 2）
[0329] The liquid crystal display element of Example 2 was produced through the same process as Example 1 except the part shown below. In this embodiment, only the first constituent material is used without using the second constituent material. As the first constituent material, a polyimide (partial polyimide) having an imidization rate of 50% and a side chain concentration of 5.7 based on the molecular structural formula was used. The molecular formula of the repeating unit containing the main chain structure of polyamic acid is C 38 h 33 N 2 o 10 f 3 , therefore, the side chain concentration based on the molecular structural formula is calculated from the mathematical formula of 3 / (38+2+10+3)×100. The concentration of side chains on the outermost surface of the alignment film of Example 2 was measured by XPS, and the result was 12.82. Therefore, the surface side chain density of the alignment film of Example 2 was 2.24.
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