Polarization splitting device, polarization splitting structure and projection device

A polarization splitting structure, comprising:

• polarization splitting devices;
• and
• a second bonding element,
• wherein each of the polarization splitting devices comprises a first optical element,
• wherein the first optical element comprises a light incident surface, a polarization splitting interface and a reflective interface, and the polarization splitting interface and the reflective interface are correspondingly arranged;
• wherein incident light enters the first optical element through the light incident surface, and is split into first light and second light through the polarization splitting interface;
• the first light is incident on the reflective interface after being reflected by the polarization splitting interface, and exits from the first optical element after being reflected by the reflective interface;
• and the second light exits from the first optical element after being transmitted through the polarization splitting interface;
• wherein each of the polarization splitting devices comprises a second optical element and a first bonding element,
• wherein the second optical element is bonded to the polarization splitting interface of the first optical element through the first bonding element, and the second light transmitted from the polarization splitting interface enters the second optical element and is guided by and exits from the second optical element, and the first light reflected by the polarization splitting interface does not pass through the first bonding element,
• wherein the second bonding element is configured to bond every two adjacent ones of the polarization splitting devices, and the first light exits after being reflected by the reflective interface of the first optical element, without passing through the second bonding element, and
• a polarization splitting film coated on the polarization splitting prism forms the polarization splitting interface, a bonding interface where the second optical element is bonded to the first optical element is coated with an anti-reflective film, the anti-reflective film is provided between the second optical element and the first bonding element, in such a manner that the polarization splitting film, the first bonding element and the anti-reflective film are arranged in sequence.

A projection device, comprising at least one polarization splitting device, wherein each of the at least one polarization splitting device comprises a first optical element,

• wherein the first optical element comprises a light incident surface, a polarization splitting interface and a reflective interface, and the polarization splitting interface and the reflective interface are correspondingly arranged,
• wherein incident light enters the first optical element through the light incident surface, and is split into first light and second light through the polarization splitting interface;
• the first light is incident on the reflective interface after being reflected by the polarization splitting interface, and exits from the first optical element after being reflected by the reflective interface;
• and the second light exits from the first optical element after being transmitted through the polarization splitting interface,
• wherein each of the at least one polarization splitting device further comprises a second optical element and a first bonding element, and
• wherein the second optical element is bonded to the polarization splitting interface of the first optical element through the first bonding element, and the second light transmitted from the polarization splitting interface enters the second optical element and is guided by and exits from the second optical element, and the first light reflected by the polarization splitting interface does not pass through the first bonding element, and
• a polarization splitting film coated on the polarization splitting prism forms the polarization splitting interface, a bonding interface where the second optical element is bonded to the first optical element is coated with an anti-reflective film, the anti-reflective film is provided between the second optical element and the first bonding element, in such a manner that the polarization splitting film, the first bonding element and the anti-reflective film are arranged in sequence.