Polarized light conversion device and manufacturing method therefor

A polarized light conversion device, comprising:

• a polarizing beam splitter array, formed by bonding at least two first light-transmitting components, second light-transmitting components being bonded to both ends of the polarizing beam splitter array, and a polarizing beam splitter film being disposed between each of the at least two first light-transmitting components and one of the at least two first light-transmitting components or one of the second light-transmitting components adjacent thereto;
• and
• a half-wave plate, disposed on an optical output path of the polarizing beam splitter array,
• wherein the half-wave plate is a polymer layer formed by coating a liquid crystal polymer on the optical output path of the polarizing beam splitter array and patterning the liquid crystal polymer by directly using S-polarized light emitted from the polarizing beam splitter array during manufacturing.

A manufacturing method for a polarized light conversion device, comprising the following steps:

• step S1, fabricating a polarizing beam splitter (PBS) by selecting quartz glass as a substrate material for a prism, and fabricating the quartz glass into a right-angle prism and a rhombic prism;
• step S2, coating a PBS film by coating an inclined surface of the rhombic prism with the PBS film;
• step S3, fabricating a PBS flat plate by bonding together inclined surfaces of two adjacent rhombic prisms through optical contacting;
• bonding together at least two rhombic prisms into a whole through the optical contacting, to form a PBS array;
• and bonding right-angle prisms to both ends of the PBS array through the optical contacting, to form the PBS flat plate;
• step S4, coating a polymer and curing by coating an optical output path of the PBS flat plate with a liquid crystal polymer to form a polymer layer, and drying and curing the polymer layer by heating;
• step S5, photo-aligning by modulating an ultraviolet light source into S-polarized light with a pattern identical to a pattern of a patterned polymer half-wave plate, irradiating the S-polarized light to an optical input path of the PBS array, and achieving directional alignment of liquid crystal molecules in the polymer layer using a photochemical reaction, thus forming the patterned polymer half-wave plate;
• and
• step S6, post-processing by subjecting a photo-aligned polarized light conversion device to a baking treatment, and subjecting a baked polarized light conversion device to optical performance testing and appearance inspection.