| 摘要 |
Provided is a phase difference control member which has a function to suppress a surface step amount and an excellent optical compensation function for the optical phase difference caused by a deflection plate. In the phase difference control member (1), the phase difference layer (4) has an optical axis standing against the surface having a normal in the thickness direction of the phase difference layer (4) and a surface step amount T of the phase difference layer (4) is smaller than 500 nm. When the phase difference layer (4) has refraction factors nx, ny, nz in the direction of the X axis, Y axis, and Z axis, the nx, ny, nz for the lightof wavelength 589 nm and a coefficient P are in the relationship of P = (nz-((nx + ny/2)) and the coefficient P and a thickness d (nm) of the phase difference layer (4) satisfy the following expressions: 0.005 < P < 0.04 (Expression 1) d < 2000 (Expression 2) 10 < P x d < 40. (Expression 3)
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