Optical display system, control method and display device

An optical display system, wherein the system comprises:

• a display screen;
• a first light splitting unit, disposed at a display side of the display screen, wherein the first light splitting unit is configured to transmit a first-type polarized light and block a second-type polarized light, and light emitted from the display screen is converted into the first-type polarized light after passing through the first light splitting unit;
• a first imaging unit, disposed at a light emission side of the first light splitting unit, wherein the first imaging unit comprises a light splitting film disposed at a light-incident surface of the first imaging unit, and the light splitting film is configured to transmit light and reflect light;
• a second light splitting unit, disposed at a light emission side of the first imaging unit, wherein the second light splitting unit is configured to transmit the first-type polarized light and reflect the second-type polarized light;
• and
• a phase modulation unit, disposed at least in a light path from the first imaging unit to the second light splitting unit, wherein the phase modulation unit is configured to modulate a phase of light;
• wherein, the first-type polarized light transmitted from the first light splitting unit travels between the first imaging unit and the second light splitting unit as follows:
• reaching the second light splitting unit after passing through the first imaging unit and the phase modulation unit in sequence;
• being reflected back to the phase modulation unit by the second light splitting unit, and transmitted, after being modulated by the phase modulation unit, to the light splitting film of the first imaging unit;
• being reflected to the phase modulation unit by the light splitting film, and transmitting, after being modulated by the phase modulation unit, from the light emission side of the second light splitting unit.