Holographic display system and electronic device

A holographic display system, comprising:

• a backlight module configured to emit backlight;
• a plurality of optical modules arranged at a side of the backlight module where the backlight is to be emitted, wherein the plurality of optical modules comprise at least a first optical module, a second optical module and a third optical module arranged sequentially in a first direction towards which the backlight is to be emitted, the first optical module is configured to transmit light of a first polarization direction, the second optical module is configured to transmit light of a second polarization direction, and the third optical module is configured to transmit light of a third polarization direction, the first polarization direction, the second polarization direction, and the third polarization direction are not parallel to each other, wherein the first polarization direction, the second polarization direction and the third polarization direction are all parallel to a reference plane, and the reference plane is perpendicular to the first direction;
• at least two of the first optical module, the second optical module and the third optical module are liquid crystal grating;
• and
• optical rotators configured to shift the polarization direction, wherein the first optical module, a first one of the optical rotators, the second optical module, a second one of the optical rotators and the third optical module are arranged in sequence in the first direction, the first polarization direction and the second polarization direction are at an angle of β1, the second polarization direction and the third polarization direction are at an angle of β2, and the first polarization direction and the third polarization direction are at an angle of β3, wherein β3 is greater than at least one of β1 and β2.