Cellulose acylate film, optical compensation film, polarizing plate, and liquid crystal display device
A liquid crystal display device, cellulose acylate technology, applied in optics, polarizing elements, nonlinear optics, etc., can solve problems such as difficult viewing angle characteristics
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[0240] [Preparation of cellulose acylate film]
[0241] The cellulose acylate film is preferably produced using a solvent casting method. In the solvent casting method, a film can be produced using a solution (dope) obtained by dissolving cellulose acylate in an organic solvent. The organic solvent preferably contains a solvent selected from ethers with 3 to 12 carbon atoms, ketones with 3 to 12 carbon atoms, esters with 3 to 12 carbon atoms, and halogenated hydrocarbons with 1 to 6 carbon atoms. These ethers, ketones and esters may have a ring structure. Compounds having two or more ether, ketone, and ester functional groups (ie, -O-, -CO-, and -COO-) can also be used as organic solvents. The organic solvent may have other functional groups such as alcoholic hydroxyl groups. When the organic solvent has two or more functional groups, the number of carbon atoms needs to satisfy the range specified for the compound having any one functional group.
[0242] Examples of ether...
Embodiment 1-1
[0479] for having figure 1 The liquid crystal display device with the structure shown is subjected to optical simulation to verify the effect. Optical calculations were performed using Master Ver6.08 of Shintec, Inc. Any liquid crystal cells, electrodes, substrates, polarizing plates, etc. may be those used for conventional liquid crystal displays, all of which are used without change. The liquid crystal material used is ZLI-4792 supplied with LCD Master. The liquid crystal cell has parallel and horizontal orientations with a pretilt angle of 8°, a cell gap of 6.5 μm, contains a liquid crystal material with positive dielectric anisotropy, and the liquid crystal retardation (i.e., thickness d (μm) and refractive index anisotropy Δn The product Δn·d) is 630nm. The polarizing film used is G1220DU supplied with LCD Master. The transparent film was adjusted so that the Re and Rth values at each wavelength were as shown in the column "Example 1-1" of Table 1-1. The front reta...
Embodiment 2-1～4-1
[0483] According to the same method as described in Example 1-1, the optical characteristics of the liquid crystal display device were determined by calculation using LCD Master, except that the Re and Rth values of the transparent film were set so that the optical characteristics listed in Table 1-1 were obtained.
[0484]
[0485] To each of these liquid crystal display devices, a voltage that produces the minimum front transmittance, that is, a black level voltage, is applied, and the black level transmittance (%) at the viewing angle of the azimuth = 0°, the polar angle = 60°, and the azimuth Color shift Δx between the angle = 0°, polar angle = 60° direction and the azimuth = 180°, polar angle = 60° direction. The results are shown in Table 1.
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