CN216748422U - Two-piece type LCOS projection optical structure - Google Patents
Two-piece type LCOS projection optical structure Download PDFInfo
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- CN216748422U CN216748422U CN202122398505.6U CN202122398505U CN216748422U CN 216748422 U CN216748422 U CN 216748422U CN 202122398505 U CN202122398505 U CN 202122398505U CN 216748422 U CN216748422 U CN 216748422U
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Abstract
The utility model provides a two-piece LCOS projection optical structure, which adopts two LCOS silicon-based liquid crystal display chips, and divides two optical paths to respectively modulate S polarized light and P polarized light which are split by a light source after being polarized by a film-coated PBS, and the S polarized light and the P polarized light are modulated by a first LCOS chip and a second LCOS chip, then are combined and are imaged and output by a lens. The PCS-free structure reduces polarization conversion loss and system expansion loss, and therefore system efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of projectors, in particular to a two-piece LCOS projection optical structure.
Background
For a traditional 3LCOS projector, a compound eye is mainly used to be matched with a PCS polarization conversion component to modulate the polarization state of light, three-color pictures of red, green and blue are respectively displayed on a 3-chip through spatial light splitting, and then the three-color pictures are synthesized through a color synthesizing prism and projected and imaged through a lens. Wherein the compound eye modulates the spot uniformity of the illumination system, and the PCS converts non-polarized light emitted by the light source into polarized light, thereby improving the light utilization rate of the light source. For a micro LCOS projector, a single LCOS chip is usually used, and an LED light source is used to synthesize a color picture through timing control, and the color picture is projected and imaged through a lens. The polarization conversion efficiency of the PCS and the multiplying expansion of the optical expansion of the system have no advantage relative to the light efficiency without the PCS polarization, and the size of the optical machine is increased. Therefore, the existing miniature LCOS projection does not adopt a PCS polarized light structure.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide a two-piece LCOS projection optical structure, which can improve the utilization rate of a light source, and further improve the imaging brightness.
In order to achieve the purpose, the utility model adopts the technical scheme that: a two formula LCOS projection optical structure, includes that set gradually along the light path:
the red laser light source, the green laser light source and the blue laser light source are responsible for respectively outputting red light, green light and blue light;
the light shaping lens group is configured to shape light of the light source into approximately parallel light, and a group of light sources with different colors are distributed in front;
a blue-green dichroic mirror which transmits blue light and reflects green light;
a first relay lens configured to further shape the light;
red and green dichroic mirrors which transmit blue and green light and reflect red light;
the fly-eye lens is coaxially arranged with the first relay lens and configured to modulate the uniformity of light spots;
a collimating lens disposed coaxially with the fly-eye lens;
the first polarization spectroscope is configured to divide incident light into S polarized light and P polarized light, the S polarized light is reflected by the first polarization spectroscope, and the P polarized light is transmitted through the first polarization spectroscope;
a second relay lens configured to shape the reflected S-polarized light;
a second polarizing beam splitter configured to reflect the shaped S-polarized light;
the first LCOS chip is configured to receive and image S polarized light reflected by the second polarizing beam splitter, and simultaneously modulate incident S polarized light into P polarized light to be reflected;
the third relay lens is configured to shape the P polarized light transmitted by the first polarization spectroscope, and meanwhile, a half plectrum is attached to the third relay lens to convert the P polarized light into S polarized light;
a third polarization splitting lens configured to reflect the S-polarized light converted by the third relay lens;
the second LCOS chip is configured to receive and image the S polarized light reflected by the third polarizing beam splitter, and modulate the S polarized light into P polarized light to be reflected;
the first polaroid is attached with a half-wavelength plate, P polarized light reflected by the first LCOS chip is transmitted through the first polarizing beam splitter to enter the first polaroid, the first polaroid has a light filtering effect to filter part of S polarized light which is not completely converted in the P polarized light reflected by the first LCOS chip, and then the half-wavelength plate converts the P polarized light into the S polarized light to improve the light and shade contrast of the system;
the second polaroid is used for filtering S polarized light which is not completely converted in the P polarized light reflected by the second LCOS chip so as to improve the contrast of the system;
and the light path formed by the first LCOS chip and the light path formed by the second LCOS chip are combined at the fourth polarizing beam splitter and then enter the imaging lens, and the light path is output and imaged to a screen through the imaging lens.
Furthermore, the red laser light source is a red light LED, the green laser light source comprises a green light LED and a pumping blue light LED, the blue laser light source is a blue light LED, light emitted by the pumping blue light LED is imaged on a fluorescent light emitting surface of the green light LED, and the light quantity of the green light is further excited to improve the brightness.
Compared with the prior art, the utility model has the beneficial effects that: two LCOS chips are used for synthesizing picture imaging after being respectively modulated, on the premise that the system expansion amount is not increased, the output energy of a light source is fully utilized, and compared with the traditional single-chip LCOS micro-projection, the brightness can be improved by nearly 1 time; based on the polarized light that two LCOS chips output are mutually perpendicular, this system is suitable for polarized light formula 3D glasses and red blue 3D glasses simultaneously and realizes 3D image experience.
Drawings
Fig. 1 is a schematic diagram of the optical path structure of the present invention.
Detailed Description
The technical scheme of the utility model is clearly and completely described by combining the attached drawings and specific embodiments.
Referring to fig. 1, a two-piece LCOS projection optical structure includes, sequentially disposed along an optical path:
the red laser light source, the green laser light source and the blue laser light source are responsible for respectively outputting red light, green light and blue light;
the light shaping lens group 2.1 is configured to shape light of the light source into approximately parallel light, and a group of light sources with different colors are distributed in front;
blue-green dichroic mirror 3.1, which transmits blue light and reflects green light;
a first relay lens 2.2 configured to further shape the light;
red and green dichroic mirrors 3.2 which transmit blue-green light and reflect red light;
the fly-eye lens 2.3 is coaxially arranged with the first relay lens and is configured to modulate the uniformity of light spots;
a collimating lens 2.4 arranged coaxially with the fly-eye lens;
a first polarizing beam splitter 4.1 configured to split the incident light into S-polarized light and P-polarized light, the S-polarized light being reflected by the first polarizing beam splitter, the P-polarized light being transmitted through the first polarizing beam splitter;
a second relay lens 2.5 configured to shape the reflected S-polarized light;
a second polarizing beam splitter 4.2 configured to reflect the shaped S-polarized light;
the first LCOS chip 5.1 is configured to receive and image S polarized light reflected by the second polarizing beam splitter, and simultaneously modulate the incident S polarized light into P polarized light to be reflected;
the third relay lens 2.6 is configured to shape the P polarized light transmitted by the first polarization spectroscope, and meanwhile, a half plectrum is attached to the third relay lens to convert the P polarized light into S polarized light;
a third polarization splitting lens 4.3 configured to reflect the S-polarized light converted by the third relay lens;
the second LCOS chip 5.2 is configured to receive and image the S polarized light reflected by the third polarization beam splitter, and modulate the S polarized light into P polarized light and then reflect the P polarized light;
the first polaroid 6.1 is attached with a half-wavelength plate, P polarized light reflected by the first LCOS chip is transmitted through the first polarizing beam splitter to enter the first polaroid, the first polaroid has a light filtering effect to filter out part of S polarized light which is not completely converted in the P polarized light reflected by the first LCOS chip, and then the P polarized light is converted into S polarized light by the half-wave plate so as to improve the contrast of system brightness and darkness;
the second polaroid 6.2, the P polarized light that the second LCOS chip changes and reflects passes the second polarization spectroscope and incides the second polaroid, the second polaroid filters the optical effect and filters S polarized light not completely changed in the P polarized light that the second LCOS chip reflects in order to promote the contrast of the system;
and the imaging lens 7, a light path formed by the first LCOS chip and a light path formed by the second LCOS chip are combined at the fourth polarizing beam splitter 4.4 and then enter the imaging lens, and the combined light path is output by the imaging lens and imaged to a screen.
In this embodiment, the red laser light source is red light LED1.1, the green laser light source includes green light LED1.2.1 and pump blue light LED1.2.2, the blue laser light source is blue light LED1.3, light emitted by the pump blue light LED is imaged on the fluorescent light emitting surface of the green light LED, and the light quantity of the green light is further excited to improve the brightness. In addition, the polarization beam splitting lenses are all coated polarization beam splitters.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (2)
1. A two formula LCOS projection optical structure, its characterized in that includes that set gradually along the light path:
the red laser light source, the green laser light source and the blue laser light source are responsible for respectively outputting red light, green light and blue light;
the light shaping lens group is configured to shape light of the light source into approximately parallel light, and a group of light sources with different colors are distributed in front;
a blue-green dichroic mirror which transmits blue light and reflects green light;
a first relay lens configured to further shape the light;
red and green dichroic mirrors which transmit blue and green light and reflect red light;
the fly-eye lens is coaxially arranged with the first relay lens and configured to modulate the uniformity of light spots;
a collimating lens disposed coaxially with the fly-eye lens;
the first polarization spectroscope is configured to divide incident light into S polarized light and P polarized light, the S polarized light is reflected by the first polarization spectroscope, and the P polarized light is transmitted through the first polarization spectroscope;
a second relay lens configured to shape the reflected S-polarized light;
a second polarizing beam splitter configured to reflect the shaped S-polarized light;
the first LCOS chip is configured to receive and image the S polarized light reflected by the second polarizing beam splitter, and simultaneously modulate the incident S polarized light into P polarized light to be reflected;
the third relay lens is configured to shape the P polarized light transmitted by the first polarization spectroscope, and meanwhile, a half plectrum is attached to the third relay lens to convert the P polarized light into S polarized light;
a third polarization splitting lens configured to reflect the S-polarized light converted by the third relay lens;
the second LCOS chip is configured to receive and image the S polarized light reflected by the third polarizing beam splitter, and modulate the S polarized light into P polarized light to be reflected;
the first polaroid is attached with a half-wavelength plate, P polarized light reflected by the first LCOS chip is transmitted through the first polarizing beam splitter to enter the first polaroid, the first polaroid has a light filtering effect to filter part of S polarized light which is not completely converted in the P polarized light reflected by the first LCOS chip, and then the half-wavelength plate converts the P polarized light into the S polarized light to improve the light and shade contrast of the system;
the second polaroid is used for filtering S polarized light which is not completely converted in the P polarized light reflected by the second LCOS chip so as to improve the contrast of the system;
and the light path formed by the first LCOS chip and the light path formed by the second LCOS chip are combined at the fourth polarizing beam splitter and then enter the imaging lens, and the light path is output and imaged to a screen through the imaging lens.
2. The two-piece LCOS projection optical structure of claim 1, wherein: the red laser light source is a red light LED, the green laser light source comprises a green light LED and a pumping blue light LED, the blue laser light source is a blue light LED, light emitted by the pumping blue light LED is imaged on a fluorescent light emitting surface of the green light LED, and the light quantity of the green light is further excited to improve the brightness.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122398505.6U CN216748422U (en) | 2021-09-30 | 2021-09-30 | Two-piece type LCOS projection optical structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122398505.6U CN216748422U (en) | 2021-09-30 | 2021-09-30 | Two-piece type LCOS projection optical structure |
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| CN216748422U true CN216748422U (en) | 2022-06-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115996283A (en) * | 2023-03-23 | 2023-04-21 | 北京深光科技有限公司 | Touch interaction projection optical machine without external laser and camera module |
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2021
- 2021-09-30 CN CN202122398505.6U patent/CN216748422U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115996283A (en) * | 2023-03-23 | 2023-04-21 | 北京深光科技有限公司 | Touch interaction projection optical machine without external laser and camera module |
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