Polarization conversion device

[0013] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0014] The polarization conversion device according to the present invention includes a plurality of sub-modules. figure 1 It shows a schematic structural diagram of a sub-module of a polarization conversion device according to an embodiment of the present invention.

[0015] Reference figure 1 , The sub-module includes two polarizing devices and a half retarder. Preferably, the sub-module includes two parts arranged up and down, namely an upper part and a lower part, wherein the upper part and the lower part each include a polarizing device 101, and the half retarder 102 is placed on the upper part.

[0016] Wherein, the half retarder 102 is placed on the upper or lower part. Specifically, if the incident light needs to pass through the sub-module to transmit the first polarized light, the half retarder is superimposed on the lower part; if the incident light needs to pass through the sub-module to transmit the second polarized light, then the half A retarder is superimposed on the upper part.

[0017] Wherein, the polarizing device 101 is used to transmit the first polarized light and reflect the second polarized light. Wherein, the first polarized light and the second polarized light are used to indicate light of a specific polarization state, for example, transmitting S light and reflecting P light, or transmitting P light and reflecting S light.

[0018] Wherein, the polarizing device 101 is placed obliquely and at 45 degrees to the direction of incident light.

[0019] Preferably, the polarizing device 101 is a reflective polarizer.

[0020] Preferably, the polarizing device 101 is a polarized beam splitter (PBS), so as to increase the available beam angle and increase the utilization rate of light energy.

[0021] Preferably, the polarizing device 101 is a line grating.

[0022] Wherein, the half retarder 102 is used to convert the first polarized light transmitted by the polarizing device into the second polarized light.

[0023] Specifically, the one-half phase retarder 102 rotates the vibration direction of linearly polarized light passing through it by 90 degrees.

[0024] Preferably, the half phase retarder is a 102 half wave plate.

[0025] It should be noted that those skilled in the art should be familiar with that a variety of devices can be used to realize the functions of the above-mentioned polarizing device 101 and phase retarder 102, and those skilled in the art can select suitable devices based on actual needs to realize the polarization according to the present invention. Conversion device.

[0026] figure 2 A schematic structural diagram of a polarization conversion device according to an example of the present invention is shown.

[0027] The polarization conversion device according to this example is included in a VR screen, and the number of sub-modules included in the polarization conversion device is more than twice the number of pixels of the VR screen. figure 2 Two sub-modules included in the polarization device of this example, sub-module 201 and sub-module 202 are shown.

[0028] Reference figure 2 , The sub-module 201 and the sub-module 202 each include two parts arranged up and down, an upper part and a lower part. Wherein, the upper part and the lower part each contain a PBS, the PBS is placed obliquely and at 45 degrees to the direction of the incident light, and the half-wave plate is placed on the upper part and attached to the upper part. Among them, PBS is used to transmit P light and reflect S light. The half-wave plate is used to convert the P light transmitted by the PBS into S light.

[0029] Reference figure 2 The arrow shown in to indicate the direction of light. For the sub-module 201, after the unpolarized incident light passes through the PBS on the upper part of the sub-module 201, the P light transmitted by the PBS is then converted into S light after passing through the half-wave plate. The S light reflected by the PBS is After passing the lower PBS, it is reflected by the PBS. After passing through the sub-module 201, the incident light is converted into S light, so that the incident light passes through the sub-module 201 and transmits the S light as a whole. Similarly, the module 202 and the remaining sub-modules included in the polarization conversion device all convert incident light into S light, so that the VR screen emits S light.

[0030] It should be noted that the above examples are only to better illustrate the technical solutions of the present invention, rather than to limit the present invention. Those skilled in the art should understand that any implementation of the polarization conversion device should be included in the scope of the present invention. Inside.

[0031] It should be noted that the above examples are only to better illustrate the technical solutions of the present invention, rather than to limit the present invention. Those skilled in the art should understand that any implementation manner should be included in the scope of the present invention.

[0032] According to the solution of the present invention, incident light is converted into polarized light by a deflection conversion device composed of a plurality of polarizing devices and a half retarder, so that the non-polarized light-emitting screen can be changed to a polarized light-emitting screen, and the The theoretical light energy utilization rate of the optical system is increased to 100%, which greatly improves the light energy utilization rate.

[0033] For those skilled in the art, it is obvious that the present invention is not limited to the details of the foregoing exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the foregoing description, and therefore it is intended to fall within the claims. All changes within the meaning and scope of the equivalent elements of are included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "including" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the system claims can also be implemented by one unit or device through software or hardware. Words such as first and second are used to denote names, but do not denote any specific order.