Polarization modulator and display apparatus

A display apparatus, comprising:

• a display panel, a first electrically controlled phase retarder, a polarization modulator and a second polarizer, wherein the display panel has a display surface,
• the first electrically controlled phase retarder overlaps the display panel,
• the polarization modulator includes a first polarizer and a polarization modulation unit,
• the first polarizer has a first absorption axis, the polarization modulation unit includes a first phase retardation film, the first phase retardation film has a first optical axis, an orthographic projection of the first optical axis on the display surface is not parallel and not perpendicular to an orthographic projection of the first absorption axis on the display surface, a sum of an in-plane phase retardation of the polarization modulation unit is greater than or equal to -50 nm and less than or equal to 50 nm,
• the second polarizer is disposed on one side of the first electrically controlled phase retarder facing away from the polarization modulator and has a second absorption axis, and the second absorption axis is perpendicular to the first absorption axis.