CN117452758A

CN117452758A - LCoS chip projection ray apparatus and projecting apparatus

Info

Publication number: CN117452758A
Application number: CN202311784285.8A
Authority: CN
Inventors: 李城锦; 梁彩虹
Original assignee: Hardston Mobile Media Asia Pacific Co ltd
Current assignee: Hardston Mobile Media Asia Pacific Co ltd
Priority date: 2023-12-23
Filing date: 2023-12-23
Publication date: 2024-01-26

Abstract

The application discloses an LCoS chip projection optical machine and a projector, which comprise a non-polarized light source for emitting a non-polarized light beam; the shaping beam splitting module is used for splitting the unpolarized light beam to obtain a plurality of beam splitting beams; the polarization light converter comprises a beam splitting prism array and a plurality of polarization components, wherein the beam splitting prism array comprises a plurality of beam splitters, each beam splitter can receive corresponding beam splitting beams and enable the beam splitting beams to emit S light or P light, the polarization components are arranged on an emitting light path of the S light so as to adjust the S light into P light or the polarization components are arranged on an emitting light path of the P light so as to adjust the P light into S light and an LCoS chip, and the polarization components are used for simultaneously receiving the S light emitted by the beam splitting lenses and the S light emitted by the polarization components or simultaneously receiving the P light emitted by the beam splitting lenses and the P light emitted by the polarization components. According to the scheme, through the light source conversion mode, the light source is converted instead of lost, and the optical properties such as brightness, contrast and the like of the LCoS display product can be effectively improved.

Description

LCoS chip projection ray apparatus and projecting apparatus

Technical Field

The application relates to the technical field of optical machines, in particular to an LCoS chip projection optical machine and a projector.

Background

The LCoS chip (Liquid Crystal on Silicon) is a micro-optical element composed of a liquid crystal and a silicon-based substrate. The normal operation of the LCoS chip needs to use polarized light (P light or S light), but the light emitted by the conventional illumination light source LED is natural light (unpolarized light source), and only a small part of light is reflected back to the target area under the irradiation of natural light, and the rest of light is scattered or absorbed, so that the overall transmittance of the device is lower. Meanwhile, under the irradiation of natural light, the LCoS chip requires higher voltage to realize high-brightness image display, which however causes larger problems of power consumption and temperature rise. In addition, the brightness of an image displayed under natural light may also decrease due to the influence of interference effects. Therefore, the performance of the LCoS chip under the unpolarized light source is poor, for example, the brightness and contrast cannot meet the requirements of use, and a great energy loss is caused.

In the related art, there are two solutions, the first is a filtering solution, which uses a polarizer to forcibly directly filter natural light into desired polarized light according to product design requirements: p-light component or S-light component. The second is a polarization conversion scheme, and natural light mainly consists of light waves with two polarization states, namely P light and S light. The principle of the scheme is as follows: a Polarization Beam Splitter (PBS) is utilized to split a beam of natural light into two beams of polarized light of P light and S light, and the two beams of polarized light propagate along different directions; and then, one of the P light or the S light is subjected to phase deflection by using the 1/2 phase wave plate, so that the P light is converted into the S light or the S light is converted into the P light. And then combining the converted P light or S light with the P light or S light separated by a Polarization Beam Splitter (PBS), so as to provide complete polarized light for the LCoS chip.

For the related art, when the polarizer is used for polarized light conversion, part of light is absorbed or reflected, so that light loss is caused; the light source is usually a point light source or a surface light source with a relatively large radiation range, and the light beam emitted by the light source has a certain divergence angle. If the light beam with larger divergence angle is directly projected onto the deflection beam splitter, the problems of defocusing, angle diffusion and the like of the light beam can be caused, and the deflection effect and the stability of an optical system are affected.

Disclosure of Invention

In order to improve the brightness and contrast of the system, the application provides an LCoS chip projection optical machine and a projector.

The LCoS chip projection optical machine provided by the application adopts the following technical scheme:

first aspect

An LCoS chip projector comprising:

a non-polarized light source for emitting a non-polarized light beam;

the shaping beam splitting module is used for splitting the unpolarized light beam emitted by the unpolarized light source to obtain a plurality of beam splitting beams;

the polarization light converter comprises a beam splitting prism array and a plurality of polarization components, the beam splitting prism array comprises a plurality of beam splitters which are sequentially arranged side by side, each beam splitter can receive a corresponding beam splitting beam and enable the beam splitting beam to emit S light or P light, the polarization components are arranged on an emitting light path of the S light so as to adjust the S light into P light or the polarization components are arranged on an emitting light path of the P light so as to adjust the P light into S light; and

and the LCoS chip is used for simultaneously receiving the S light emitted by the spectroscope and the S light emitted by the polarization component or simultaneously receiving the P light emitted by the spectroscope and the P light emitted by the polarization component.

By adopting the technical scheme, the shaping beam splitting module divides the unpolarized light beam into a plurality of beam splitting beams so that the beam splitting beams can be incident into the polarized light converter in each section, the polarization state of the beam splitting beams can be more uniform and stable, and the conversion efficiency of the polarized light converter is improved. Meanwhile, the unpolarized light beam can be converted into P light or S light with a polarized state through the combination of the spectroscope and the polarized component, and the converted single polarized light source can be supplied to the LCoS chip for use. In addition, under natural light irradiation, the LCoS chip can realize high-brightness image display by using higher voltage, but the high-brightness image display can be realized without using higher voltage after conversion, so that the energy consumption is effectively reduced.

Optionally, the method further comprises: and the light focusing device is arranged between the polarized light converter and the LCoS chip and is used for focusing and incidence of the light beam emitted by the polarized light converter to the LCoS chip.

By adopting the technical scheme, before the single polarized light beam is incident to the LCoS chip, a condensing device is added to focus divergent light rays at a point or a specific area, so that the intensity of the light rays in the area can be improved, the LCoS chip can receive stronger light signals, and the brightness and the definition of an image are improved; the light condensing device can also adjust the direction of light, so that the light can be better beaten on the LCoS chip, the quality of an image can be effectively improved, and the loss of the light can be reduced.

Optionally, the light condensing device is a compound parabolic condenser, a fresnel lens, a biconvex lens group, a meniscus lens group or a reflective cup.

By adopting the technical scheme, different light gathering devices are selected according to actual application scenes, so that LCoS chip projection optical machine products can be matched better.

Optionally, the shaping beam splitting module is a fly eye lens array, and the fly eye lens array comprises fly eye microlenses arranged in an array.

By adopting the technical scheme, the unpolarized light source is divided into a plurality of split beams by the compound eye microlenses arranged in an array, and the number of the split beams can be adjusted by adjusting the array number of the compound eye microlenses. And the shaping beam splitting module is selected as the fly-eye lens array, so that compared with a traditional single lens system, the fly-eye lens array can capture more details and clearer images and has better performance in the aspects of depth perception and ranging.

Optionally, the number of the spectroscopes corresponds to the number of columns of the fly-eye lens array, and one column of the fly-eye microlenses at least corresponds to two spectroscopes.

By adopting the technical scheme, in order to ensure that light beams can be both converted into S light or both converted into P light, at least two spectroscopes are required to convert a section of light splitting beam split by a series of compound eye microlenses into P light and S light to be emitted, and the emitted P light or S light is converted by a polarization component, so that the light splitting beam is converted into single P light to be emitted or single S light to be emitted. Such a design can reduce the size of the beam splitting prism array, thereby reducing cost.

Optionally, the width of each beam is equal, and the interval between adjacent beams is equal to the width between each row of compound eye microlenses.

By adopting the technical scheme, the mutual noninterference and intersection between the light beams can be ensured, and the independence of the light beams is ensured.

Optionally, a light source collimation module is disposed between the unpolarized light source and the shaping beam splitting module, and the light source collimation module is configured to collimate the unpolarized light beam emitted by the unpolarized light source to obtain a parallel unpolarized light beam.

By adopting the technical scheme, the light beams can be parallel as much as possible through the collimation light source, so that the quality and consistency of the light beams are improved. If the directions of the light beams emitted by the light sources are inconsistent or have larger deviation, the directivity of the light beams can be influenced after shaping and beam splitting, so that the light beams cannot be accurately transmitted to the target position, the collimation light sources can ensure the directivity of the light beams, and the light beams are ensured to be accurately transmitted to the target position.

Optionally, the polarizing component is a 1/2 wave plate.

Optionally, the optical fiber array further comprises a reflection assembly, wherein the reflection assembly is arranged between the polarized light converter and the LCoS chip.

Through adopting above-mentioned technical scheme, guide the light beam to specific direction or position through the reflection subassembly to can change the position between polarization light converter and the LCoS chip, and then can adjust LCoS chip projection ray apparatus's overall shape and size according to actual application scene, improve the suitability.

Second aspect

A projector, comprising: the LCoS chip projector comprises a projector and an optical lens arranged in the light emergent direction of the projector, wherein the projector is the LCoS chip projector.

In summary, the present application includes at least one of the following beneficial technical effects:

according to the scheme, the light source is converted instead of lost in a light source conversion mode, so that the optical properties such as brightness, contrast and the like of LCoS display products can be effectively improved. In addition, under natural light irradiation, the LCoS chip can realize high-brightness image display by using higher voltage, but the high-brightness image display can be realized without using higher voltage after conversion, so that the energy consumption is effectively reduced.

The optical path structure of the scheme is simple, the number of used components is small, and the volume is small.

Drawings

Fig. 1 is a schematic diagram of an LCoS chip projector according to embodiment 1 of the present application.

Fig. 2 is a second schematic structural diagram of an LCoS chip projector according to embodiment 1 of the present application.

Fig. 3 is a schematic diagram showing the arrangement of fly's eye microlenses in example 1 of the present application.

Fig. 4 is a schematic structural diagram of a polarized light converter according to embodiment 1 of the present application.

Fig. 5 is a second schematic structural diagram of a polarized light converter according to embodiment 1 of the present application.

Fig. 6 is a graph of conversion efficiency of P-light and S-light provided in example 1 of the present application.

Fig. 7 is a third schematic structural diagram of an LCoS chip projector according to embodiment 2 of the present application.

Fig. 8 is a schematic structural diagram of a projector provided in embodiment 3 of the present application.

Fig. 9 is a schematic structural diagram of a projector provided in embodiment 4 of the present application.

Reference numerals illustrate:

100. a non-polarized light source; 110. splitting the light beam; 121. a red light chip; 122. a green light chip; 123. a blue light chip; 200. a light source collimation module; 210. a reflective cup; 220. a collimating lens group; 230. a first half mirror; 300. shaping and beam splitting modules; 310. compound eye micro lens; 400. a polarized light converter; 410. a beam splitting prism array; 411. a beam splitter; 412. a polarizing film; 420. a polarizing component; 500. a light condensing device; 510. a second half mirror; 600. an LCoS chip; 700. a reflective assembly; 800. an optical lens.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-9.

The embodiment of the application discloses an LCoS chip projection optical machine.

Example 1

Referring to fig. 1, the LCoS chip projector includes an unpolarized light source 100, a light source collimating module 200, a shaping beam splitting module 300, a polarized light converter 400, a condensing device 500, and an LCoS chip 600 sequentially disposed along a light transmission direction.

The unpolarized light source 100 may be an LED, an incandescent lamp, a xenon lamp, or the like. Lasers typically have significant polarization properties, but in some cases, such as multiple reflections or scattering within the laser, the laser may also exhibit non-polarized properties, and thus, the laser may also be used as the non-polarized light source 100.

The unpolarized light source 100 emits an unpolarized light beam, the unpolarized light beam passes through the light source collimation module 200, and the light source collimation module 200 collimates the unpolarized light beam, so that the unpolarized light beam is incident to the shaping beam splitting module 300 in parallel as much as possible. Referring to fig. 1 and 2, the light source collimation module 200 may be a reflector cup 210 or a collimation lens group 220; in one embodiment, the collimating lens group 220 includes two collimating lenses disposed along the same optical axis and spaced apart.

Referring to fig. 1, parallel unpolarized light beams are incident to a shaping beam splitting module 300, and the shaping beam splitting module 300 splits the unpolarized light beams into a plurality of sub-beams 110 having a specific size. In this embodiment, the shaping beam splitting module 300 is a fly-eye lens array, and the parameter structure of the fly-eye lens array is as follows: size units (mm).

Wherein, radius R1 and radius R2 are radii of curvature and pixel is a pixel.

Referring to fig. 1 and 3, the fly-eye lens array includes fly-eye microlenses 310 arranged in an array 7x13, so that the unpolarized light beam is divided into 7 sub-beams 110 having a width of 1.03mm and a length of 15.09mm after passing through the fly-eye lens array, each sub-beam 110 has an equal width, and a space between adjacent sub-beams 110 is equal to a width between each row of the fly-eye microlenses 310.

In this embodiment, based on the above-mentioned parametric structure of the fly-eye lens array, at this time, the spacing between adjacent sub-beams 110 in the divided seven sub-beams 110 is 1mm, so that a sub-beam 110 having a specific size is formed, and the sub-beam 110 is matched with the polarization converter 400.

Referring to fig. 4,7 beams 110 having a specific size enter the polarization converter 400 perpendicularly to the incident plane of the polarization converter 400, and are polarization-converted by the polarization converter 400.

Referring to fig. 4 and 5, in the present embodiment, the polarized light converter 400 includes a beam splitter prism array 410 and a plurality of polarization components 420, the beam splitter prism array 410 includes a plurality of beam splitters 411 disposed side by side in sequence, the beam splitters 411 are made into a long strip shape, the plurality of beam splitters 411 are glued together, a polarizing film 412 is plated on the gluing interface, and the polarizing film 412 can transmit P light and reflect S light. The beam splitting prism array 410 has a dimension of 1.05mm in width, 15.09mm in length, and 1.05mm in thickness.

In this embodiment, the split beam 110 is incident on the beam splitter 411, and the incident angle is 45 ° at the polarizing film 412, so that the polarized light quality is good, and the P light transmittance Tp >96% and the S light reflectance Rs >99% can be achieved. The split beam 110 transmits the polarizing film 412 and exits from the exit face of the beam splitter 411, and the S light is transmitted by reflection of the polarizing film 412 and is continuously reflected by the adjacent polarizing film 412, and finally exits perpendicular to the exit face of the beam splitter 411.

Referring to fig. 4, it is assumed that all the unpolarized light beam needs to be converted into P light, at this time, the polarization component 420 is disposed on the outgoing light path of the S light, the polarization component 420 can adjust the S light into P light, in this embodiment, the polarization component 420 is a 1/2 wave plate, and the 1/2 wave plate can be glued on the outgoing surface of the S light of the beam splitter 411.

Referring to fig. 5, it is assumed that all unpolarized light beams need to be converted into S light, and at this time, a 1/2 wave plate is disposed on an outgoing light path of P light, and the polarization component 420 adjusts the P light into S light, so as to finally achieve outgoing of a single polarized light beam.

By using the scheme of the application, the conversion efficiency of the light source can be effectively improved, and the conversion efficiency of the polarized light converter 400 is shown in fig. 6. The horizontal axis is wavelength, the vertical axis is conversion efficiency, the lower curve is S light, and the upper curve is P light.

Referring to fig. 3 and 4, in the present embodiment, the number of beam splitters 411 corresponds to the number of columns of the fly-eye lens array, and one column of fly-eye microlenses 310 is disposed corresponding to at least two beam splitters 411. For example, when the fly-eye lens array is 7×13, the number of beam splitters 411 is at least 14, so that when the fly-eye lens array splits the unpolarized light beam into 7 split beams 110, and each split beam 110 enters the beam splitters 411, the beam splitters 411 can split each split beam 110 into P light and S light for emission, and the transmission paths of the P light and the S light in the beam splitters 411 cannot interfere with each other, and after the beam splitters are matched with the 1/2 wave plate, the split beam 110 can be converted into a single polarized light beam for emission.

Referring to fig. 1, a single polarized light beam exiting in parallel is focused by a condensing device 500 to be incident on an LCoS chip 600. The light condensing device 500 may be a compound parabolic condenser, a fresnel lens, a lenticular lens group, a meniscus lens group, or a reflective cup 210, and the light condensing device 500 may adjust the direction of light, so that light can better strike the LCoS chip 600, which can effectively improve the quality of an image and reduce the loss of light.

The LCoS chip 600 receives the focused P-light or S-light at the same time, so that the LCoS chip 600 can receive a stronger optical signal, thereby further improving the brightness and contrast of the image.

The implementation principle of the LCoS chip projection optical machine in embodiment 1 of the present application is as follows: according to the scheme, the light source is converted instead of lost in a light source conversion mode, so that the optical properties such as brightness, contrast and the like of LCoS display products can be effectively improved. In addition, under the irradiation of natural light, the LCoS chip 600 needs a higher voltage to realize high-brightness image display, but this causes larger power consumption and temperature rise problems, and after conversion, high-brightness or contrast image display can be realized without a higher voltage, thereby effectively reducing energy consumption.

Example 2

The present embodiment is different from embodiment 1 in that, referring to fig. 7, a reflection assembly 700 is further disposed between the light condensing device 500 and the LCoS chip 600. In this embodiment, the reflection assembly 700 is an optical waveguide lens, and changes the propagation direction of the light beam through the optical waveguide lens, so that the position between the polarized light converter 400 and the LCoS chip 600 can be changed, and the overall shape and size of the projection optical engine of the LCoS chip 600 can be adjusted according to the actual application scene, so as to improve the adaptability.

In other embodiments, the reflective assembly 700 may also be a reflective grating or a reflective array.

The embodiment of the application also discloses a projector.

Example 3

Referring to fig. 8, the projector includes a projector, which is the LCoS chip projector described above, and an optical lens 800 disposed in the light emitting direction of the projector.

Example 4

This embodiment is different from embodiment 3 in that a projector of another embodiment is provided.

Referring to fig. 9, the unpolarized light source 100 in the projection light machine may include a red light chip 121, a green light chip 122, and a blue light chip 123 sequentially disposed, and a light source collimation module 200, a first half mirror 230, a shaping beam splitting module 300, a polarized light converter 400, a light condensing device 500, a second half mirror 510, an LCoS chip 600, and an optical lens 800 sequentially disposed along an optical path transmission path of the unpolarized light source 100.

The first half mirror 230 can combine three different wavelengths into a beam of light, and transmit the beam of light into the shaping beam splitting module 300.

The second half mirror 510 is disposed at the front end of the LCoS chip 600, and is configured to transmit the polarized light beam and reflect the light beam after the adjustment of the LCoS chip 600 to the optical lens 800.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. An LCoS chip projector, comprising:

a non-polarized light source (100) for emitting a non-polarized light beam;

a shaping beam splitting module (300) for splitting the unpolarized light beam emitted by the unpolarized light source (100) to obtain a plurality of split light beams (110);

a polarized light converter (400) comprising a beam splitting prism array (410) and a plurality of polarization components (420), wherein the beam splitting prism array (410) comprises a plurality of beam splitters (411) which are sequentially arranged side by side, each beam splitter (411) can receive a corresponding beam (110) and enable the beam (110) to emit S light or P light, the polarization components (420) are arranged on an emitting light path of the S light so as to adjust the S light into P light or the polarization components (420) are arranged on an emitting light path of the P light so as to adjust the P light into S light; and

and the LCoS chip (600) is used for simultaneously receiving the S light emitted by the spectroscope (411) and the S light emitted by the polarization component (420) or simultaneously receiving the P light emitted by the spectroscope (411) and the P light emitted by the polarization component (420).

2. The LCoS chip projector as recited in claim 1, further comprising: and a light condensing device (500) arranged between the polarized light converter (400) and the LCoS chip (600), wherein the light condensing device (500) is used for focusing and incidence of the light beam emitted by the polarized light converter (400) to the LCoS chip (600).

3. An LCoS chip projector as recited in claim 2, wherein: the light gathering device (500) is a compound parabolic condenser, a Fresnel lens, a biconvex lens group, a concave-convex lens group or a reflecting cup (210).

4. The LCoS chip projector as recited in claim 1, wherein: the shaping beam splitting module (300) is a fly eye lens array, and the fly eye lens array comprises fly eye microlenses (310) arranged in an array.

5. The LCoS chip projector as recited in claim 4, wherein: the number of the spectroscopes (411) corresponds to the number of columns of the fly-eye lens array, and one column of the fly-eye microlenses (310) is at least arranged corresponding to two spectroscopes (411).

6. The LCoS chip projector as recited in claim 5, wherein: the width of each sub-beam (110) is equal, and the interval between adjacent sub-beams (110) is equal to the width between each row of compound eye microlenses (310).

7. An LCoS chip projector according to any one of claims 1-6, wherein: a light source collimation module (200) is arranged between the unpolarized light source (100) and the shaping beam splitting module (300), and the light source collimation module (200) is used for collimating the unpolarized light beam emitted by the unpolarized light source (100) to obtain a parallel unpolarized light beam.

8. An LCoS chip projection light engine according to any one of claims 1-6, wherein: the polarization component (420) is a 1/2 wave plate.

9. An LCoS chip projection light engine according to any one of claims 1-6, wherein: also included is a reflective assembly (700), the reflective assembly (700) disposed between the polarized light converter (400) and the LCoS chip (600).

10. A projector, comprising: a projector and an optical lens (800) arranged in the light emitting direction of the projector, wherein the projector is an LCoS chip projector as claimed in any one of claims 1 to 9.