CN201203713Y - One-chip type liquid crystal projecting system - Google Patents
One-chip type liquid crystal projecting system Download PDFInfo
- Publication number
- CN201203713Y CN201203713Y CNU2008200938873U CN200820093887U CN201203713Y CN 201203713 Y CN201203713 Y CN 201203713Y CN U2008200938873 U CNU2008200938873 U CN U2008200938873U CN 200820093887 U CN200820093887 U CN 200820093887U CN 201203713 Y CN201203713 Y CN 201203713Y
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- light
- polarization
- beam splitter
- polarized light
- polarizing beam
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Abstract
The utility model discloses a single chip liquid crystal projection system, which includes a light source, a polarization converter, a polarization light splitter, a single liquid crystal panel and a projection lens, wherein the polarization converter is mounted between the light source and the polarization beam splitter; the polarization converter emits all of non-polarized light from the light source to the polarization light splitter after converting into P polarized light. The polarization light splitting surface in the polarization light splitter is located in the position where the incident P polarization light is converted into an emergent S polarization light. The single liquid crystal panel receives the S polarization light and modulates it into emergent P polarization image light, then enters the projection lens through the polarization light splitter. The utility model makes full use of characteristics of high purity and high transmission ratio of P polarization light to greatly improve the image contrast of single chip liquid crystal projection system.
Description
Technical field
The utility model relates to the one chip LCD projecting system of a kind of high-contrast, high light efficiency.
Background technology
Traditional single-chip reflective liquid crystal projection system can be concluded as depicted in figs. 1 and 2, comprises light source 1, polarizing beam splitter (PBS) 2, reflection type liquid crystal chip 3 and projecting lens 4.Light source 1 can be various types of light sources, itself may contain optical filter (remove ultraviolet infrared light), focus lens group or optical wand etc., and light source 1 is launched nonpolarized light, isolates orthogonal P polarized light and S polarized light after entering polarizing beam splitter 2.Wherein polarizing beam splitter 2 is generally the cubic of standard, and is synthetic by two prisms, applies the polarization spectro rete on the diagonal plane and constitutes polarization light-dividing surface.In Fig. 1, reflection type liquid crystal chip 3 is positioned at the position of reception from the S polarized light of polarizing beam splitter 2 outgoing, this reflection type liquid crystal chip 3 is modulated into the outgoing of P polarization image light with the S polarized light of incident, directly transmits through polarizing beam splitter 2 then, enters projecting lens 4.In Fig. 2, reflection type liquid crystal chip 3 is positioned at the position of reception from the P polarized light of polarizing beam splitter 2 outgoing, this reflection type liquid crystal chip 3 is modulated into the outgoing of S polarization image light with the P polarized light of incident, enter polarizing beam splitter 2 then, polarization light-dividing surface by this polarizing beam splitter 2 reflects, and enters projecting lens 4 at last.
Obviously, to lose from polarizing beam splitter 2 isolated P polarized lights among Fig. 1, to lose from polarizing beam splitter 2 isolated S polarized lights among Fig. 2, and P polarized light or S polarized light in the optic path process because also further there is light loss in the problem of transmitance or reflectivity.So the light efficiency of single-chip LCD projecting system is lower in the prior art, significant disadvantages is that contrast is relatively poor simultaneously.Usually use a polarization converter (PCS) to improve light efficiency, this PCS is used for the nonpolarized light from light source all is converted to P polarized light or S polarized light.The PCS of an outgoing S polarized light is set between the light source 1 of Fig. 1 and polarizing beam splitter 2, and the light that enters PBS so will be the S polarized light all, offer liquid crystal chip 3 illuminations, the loss that does not produce the P polarized light basically.In like manner, if the PCS of an outgoing P polarized light is set between the light source 1 of Fig. 2 and polarizing beam splitter 2, the light that enters PBS so will be the P polarized light all, offer liquid crystal chip 3 and throw light on the loss that does not produce the S polarized light basically.
Use the single-chip LCD projecting system of PCS to improve light efficiency though increase, image shows that contrast does not still improve.
The utility model content
The purpose of this utility model promptly is in order to overcome above-mentioned defective, a kind of one chip LCD projecting system of high-contrast is provided, this LCD projecting system has been broken the conventional design thinking, overturn 90 ° by polarizing beam splitter present position in the background technology, this polarizing beam splitter just can be converted to the P polarized light of incident the outgoing of S polarized light, receives this S polarized light with liquid crystal panel then.By making full use of the characteristics of P polarized light high permeability, S polarized light high reflectance in polarizing beam splitter, this LCD projecting system has significantly increased the imaging light quantity in the light field, reduced the imaging light in the details in a play not acted out on stage, but told through dialogues, promptly this LCD projecting system has significantly improved picture contrast, and very high to the utilization factor as the P polarized light of illumination light.
The purpose of this utility model is achieved through the following technical solutions:
A kind of one chip LCD projecting system, comprise that light source, polarization converter, polarizing beam splitter, single chip liquid crystal panel and projecting lens constitute projecting light path, wherein polarization converter is between light source and polarizing beam splitter, the nonpolarized light that this polarization converter will come from light source all is converted to directive polarizing beam splitter behind the P polarized light, wherein:
(1) polarization light-dividing surface in the described polarizing beam splitter is positioned at the position that the P polarized light of incident is converted to the outgoing of S polarized light.
(2) described single chip liquid crystal panel receives above-mentioned S polarized light and is modulated into the outgoing of P polarization image light, transmits through polarizing beam splitter then, offers projecting lens.
On the said structure basis, further:
Described polarization converter is glued on the end face of polarizing beam splitter.
Described polarization converter is synthetic by two prisms, is coated with polarization beam splitter on the faying face of these two prisms, wherein also is coated with reflectance coating on the inclined-plane of a prism, also is provided with quarter-wave plate on the light-emitting face of this prism.
Perhaps described polarization converter is synthetic by three linearly aligned prisms, on the faying face between the prism, be coated with the polarization spectro rete, middle prism outgoing P polarized light, the prism outgoing S polarized light of both sides also is provided with quarter-wave plate on the light-emitting face of the prism of these both sides.
The perhaps described polarization converter PCS array that several prism linear array combine and constituted of serving as reasons, the equal outgoing P of this each PCS polarized light.
Described light source is metalized lamp or led light source or LASER Light Source.
Described liquid crystal panel is LCOS.
Compared to prior art, the beneficial effect that the utility model produces is:
Described polarization converter is used for the nonpolarized light from light source is converted into the P polarized light, this P polarized light offers polarizing beam splitter then, by utilize P polarized light purity height, the characteristics of high permeability in polarizing beam splitter, the LCD projecting system that the utility model provides can make full use of the P polarized light as illumination light, has improved light efficiency.
Topmost, by 90 ° of upset polarizing beam splitters, the polarization light-dividing surface in this polarizing beam splitter is positioned at the position that the P polarized light that will come from polarization converter is converted to the outgoing of S polarized light.This polarizing beam splitter can all be converted to the outgoing of S polarized light basically with the P polarized light, liquid crystal panel receives this S polarized light and is modulated into the outgoing of P polarization image light then, transmit through polarizing beam splitter, enter projecting lens at last, the transmitance of this P polarization image light in polarizing beam splitter is very high.The utility model has significantly increased the imaging light quantity in the light field, has reduced the light quantity in the details in a play not acted out on stage, but told through dialogues, and promptly the utility model has significantly improved picture contrast.
Description of drawings
Fig. 1 is a kind of embodiment synoptic diagram of single-chip LCD projecting system in the prior art.
Fig. 2 is the another kind of embodiment synoptic diagram of single-chip LCD projecting system in the prior art.
Fig. 3 is the part perspective view of single-chip LCD projecting system shown in Figure 2.
Fig. 4 is the structural representation of first embodiment of polarization converter.
Fig. 5 is the structural representation of second embodiment of polarization converter.
Fig. 6 is the structural representation of the 3rd embodiment of polarization converter.
The synoptic diagram of the preferred implementation of the one chip LCD projecting system that Fig. 7 provides for the utility model.
The synoptic diagram of another embodiment of the one chip LCD projecting system that Fig. 8 provides for the utility model.
Fig. 9 is polarization converter described in the utility model and polarizing beam splitter structural representation glued together.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
A kind of one chip LCD projecting system of the utility model, comprise that light source, polarization converter, polarizing beam splitter, single chip liquid crystal panel and projecting lens constitute projecting light path, wherein polarization converter is between light source and polarizing beam splitter, and the nonpolarized light that this polarization converter will come from light source all is converted to directive polarizing beam splitter behind the P polarized light.
Be necessary earlier above-mentioned polarization converter to be elaborated: this deflection converter is a prior art, the purpose that is used in the utility model is in order to obtain high light efficiency, this polarization converter all is converted to the P polarized light with the light that light source sends, this P polarized light can all be received by liquid crystal panel, has farthest avoided light loss.The structure embodiment of this polarization converter is unrestricted in the utility model.
Preferred three kinds of polarization converters are seen Fig. 4, Fig. 5, shown in Figure 6, in Fig. 4, this polarization converter 5 is synthetic by two prisms, be coated with polarization beam splitter on the faying face of these two prisms, wherein also be coated with reflectance coating on the inclined-plane of a prism, also be provided with quarter-wave plate 6 on the light-emitting face of this prism.According among the figure shown in the arrow, those skilled in the art find out easily, nonpolarized light all converts P polarized light outgoing (because there is the problem of transmitance and reflectivity in polarized light, may be mingled with the S polarized light of minute quantity in the P polarized light of last outgoing certainly) to after injecting this polarization converter 5.
In Fig. 5, this polarization converter 05 is synthetic by three linearly aligned prisms, on the faying face between the prism, be coated with the polarization spectro rete, also be coated with reflective membrane on the inclined-plane, the outside of the prism of both sides, middle prism outgoing P polarized light, the prism outgoing S polarized light of both sides also is provided with quarter-wave plate 06 on the light-emitting face of the prism of these both sides, therefore the S polarized light from the prism outgoing of these both sides becomes the P polarized light again, and promptly the light from this polarization converter 05 outgoing all is the P polarized light.
In Fig. 6, this polarization converter 005 PCS array that several prism linear array combine and constituted of serving as reasons, the equal outgoing P of this each PCS polarized light, 006 is quarter-wave plate among the figure, according among the figure shown in the arrow, those skilled in the art are not difficult to find out, are the P polarized light from this polarization converter 005 last outgoing.
The LCD projecting system that the utility model provides is described below again:
Please refer to Fig. 7, a kind of one chip LCD projecting system of high-contrast, it comprises light source (not shown), polarization converter 05, polarizing beam splitter 2 ', monolithic liquid crystal panel 3 and projecting lens (not shown), wherein this polarization converter 05 is arranged between light source and the polarizing beam splitter 2 ', this polarization converter 05 is certainly substituted by the polarization converter of polarization converter 5 or polarization converter 005 or other structures, preferred in the present embodiment polarization converter 05.
Compared to Fig. 3 (Fig. 3 is the part perspective view of LCD projecting system shown in Figure 2 in the background technology), variation has taken place in the locations of structures of the polarizing beam splitter 2 ' that the utility model provides, and the polarization light-dividing surface 022 in this polarizing beam splitter 2 ' is positioned at and will be converted to the position of S polarized light outgoing from the P polarized light of polarization converter 05.This realizes by polarizing beam splitter 2 upsets with present position among Fig. 3 that specifically 90 ° of polarizing beam splitter 2 upsets in the flipchart 3 are about to its polarization light-dividing surface 021 and have overturn 90 °, have just obtained polarizing beam splitter 2 ' and the polarization light-dividing surface 022 among Fig. 7 for 90 °.Because P polarized light and S polarized light are in orthogonal state, if when having the P polarized light to inject polarizing beam splitter 2 among Fig. 3, this P polarized light just can directly see through polarization light-dividing surface 021 and penetrate, and the polarization light-dividing surface 022 among Fig. 7 is relative vertical with this polarization light-dividing surface 021, reflects so the P polarized light is converted to the S polarized light behind polarization light-dividing surface 022.
Described monolithic liquid crystal panel 3 receives above-mentioned S polarized light and is modulated into the outgoing of P polarization image light, passes through polarizing beam splitter 2 ' then and transmits, and offers projecting lens at last.
Wherein, the nonpolarized light that polarization converter 05 will come from light source is converted to the P polarized light, above-mentioned liquid crystal panel 3 is used for throwing light on, because the purity of P polarized light is very high, and polarizing beam splitter 2 ' offers liquid crystal panel 3 after can basically the P polarized light from polarization converter 05 all being converted to the S polarized light, the purity of this S polarized light is also very high accordingly, this liquid crystal panel 3 modulates P polarization image light after polarizing beam splitter 2 ' transmits, again because the transmitance of P polarized light in polarizing beam splitter 2 ' of this band image information is very high, when so this LCD projecting system is carried out the image demonstration, significantly increased the imaging P light quantity in the light field, reduced the light quantity in the details in a play not acted out on stage, but told through dialogues, this LCD projecting system has significantly improved picture contrast (this contrast is the ratio of light field imaging light quantity and details in a play not acted out on stage, but told through dialogues imaging light quantity).Describe in detail: be light field when liquid crystal panel 3 is in illuminating state, at this moment liquid crystal panel 3 modulate illumination light are given image information; It when liquid crystal panel 3 is in closed condition details in a play not acted out on stage, but told through dialogues, this moment, liquid crystal panel 3 was equivalent to a reflective mirror, to reflect back from a large amount of S polarized lights of polarization optical splitter 2 ' and the minute quantity P polarized light that is mingled with, these a large amount of S polarized lights are polarized the former road of light splitting surface 022 reflected back again, the reflectivity of this S polarized light in polarizing beam splitter 2 ' is very high, transmitance is very low, promptly the S polarized light that reflects from this liquid crystal panel 3 can not enter projecting lens, promptly be under the details in a play not acted out on stage, but told through dialogues state, the light quantity that enters imaging in the projecting lens seldom.
As shown in Figure 8, by the polarizing beam splitter among Fig. 32 is overturn 90 ° to another way, just obtained polarizing beam splitter 2 ' and the polarization light-dividing surface 022 among Fig. 8, this polarization light-dividing surface 022 is positioned at equally and will be converted to the position of S polarized light outgoing from the P polarized light of polarization converter 05, and promptly this Fig. 8 is another embodiment of the one chip LCD projecting system of high-contrast described in the utility model.
In addition, the light source in the LCD projecting system described in the utility model can be metalized lamp or led light source or LASER Light Source, and described liquid crystal panel is LCOS.
The optimal way that polarization converter 05 is arranged between light source and the polarizing beam splitter 2 ' is seen Fig. 9, this polarization converter 05 is glued on the end face of polarizing beam splitter 2 ', form one with this polarizing beam splitter 2 ', this fit can guarantee structural reliability, can dwindle the volume of LCD projecting system again.
Claims (7)
1, a kind of one chip LCD projecting system, comprise that light source, polarization converter, polarizing beam splitter, single chip liquid crystal panel and projecting lens constitute projecting light path, wherein polarization converter is between light source and polarizing beam splitter, the nonpolarized light that this polarization converter will come from light source all is converted to directive polarizing beam splitter behind the P polarized light, it is characterized in that:
(1) polarization light-dividing surface in the described polarizing beam splitter is positioned at the position that the P polarized light of incident is converted to the outgoing of S polarized light.
(2) described single chip liquid crystal panel receives above-mentioned S polarized light and is modulated into the outgoing of P polarization image light, transmits through polarizing beam splitter then, offers projecting lens.
2, a kind of LCD projecting system as claimed in claim 1, it is characterized in that: described polarization converter is glued on the end face of polarizing beam splitter.
3, a kind of LCD projecting system as claimed in claim 1, it is characterized in that: described polarization converter is synthetic by two prisms, be coated with polarization beam splitter on the faying face of these two prisms, wherein also be coated with reflectance coating on the inclined-plane of a prism, also be provided with quarter-wave plate on the light-emitting face of this prism.
4, a kind of LCD projecting system as claimed in claim 1, it is characterized in that: described polarization converter is synthetic by three linearly aligned prisms, on the faying face between the prism, be coated with the polarization spectro rete, middle prism outgoing P polarized light, the prism outgoing S polarized light of both sides also is provided with quarter-wave plate on the light-emitting face of the prism of these both sides.
5, a kind of LCD projecting system as claimed in claim 1 is characterized in that: the described polarization converter PCS array that several prism linear array combine and constituted of serving as reasons, the equal outgoing P of this each PCS polarized light.
6, a kind of LCD projecting system as claimed in claim 1 is characterized in that: described light source is metalized lamp or led light source or LASER Light Source.
7, a kind of LCD projecting system as claimed in claim 1 is characterized in that: described liquid crystal panel is LCOS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200938873U CN201203713Y (en) | 2008-05-06 | 2008-05-06 | One-chip type liquid crystal projecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200938873U CN201203713Y (en) | 2008-05-06 | 2008-05-06 | One-chip type liquid crystal projecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201203713Y true CN201203713Y (en) | 2009-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200938873U Expired - Lifetime CN201203713Y (en) | 2008-05-06 | 2008-05-06 | One-chip type liquid crystal projecting system |
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| CN (1) | CN201203713Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778758A (en) * | 2012-04-11 | 2012-11-14 | 香港应用科技研究院有限公司 | Polarization beam splitters for image projection apparatus |
| WO2015032173A1 (en) * | 2013-09-05 | 2015-03-12 | 深圳市时代华影科技开发有限公司 | Stereographic projection device with low throw ratio and high light effect and stereographic projection system |
| CN107526236A (en) * | 2017-09-29 | 2017-12-29 | 鲜善洪 | A kind of polarized light separator and optical projection system |
| CN110221526A (en) * | 2018-03-01 | 2019-09-10 | 联士光电（深圳）有限公司 | A kind of exposure machine based on LCOS technology |
-
2008
- 2008-05-06 CN CNU2008200938873U patent/CN201203713Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8888290B2 (en) | 2011-04-08 | 2014-11-18 | Hong Kong Applied Science and Technology Research Institute Company Limited | Polarization beam splitters for image projection apparatus |
| CN102778758A (en) * | 2012-04-11 | 2012-11-14 | 香港应用科技研究院有限公司 | Polarization beam splitters for image projection apparatus |
| WO2015032173A1 (en) * | 2013-09-05 | 2015-03-12 | 深圳市时代华影科技开发有限公司 | Stereographic projection device with low throw ratio and high light effect and stereographic projection system |
| EP2869116A4 (en) * | 2013-09-05 | 2016-01-20 | Shenzhen Time Waying Technology Co Ltd | Stereographic projection device with low throw ratio and high light effect and stereographic projection system |
| US9638926B2 (en) | 2013-09-05 | 2017-05-02 | Shenzhen Time Waying Technology Co., Ltd. | Stereo projection apparatus and stereo projection system with low throw ratio and high light efficiency |
| EA030953B1 (en) * | 2013-09-05 | 2018-10-31 | Шэньчжэнь Тайм Вэинг Текнолоджи Ко., Лтд. | Stereo projection apparatus and stereo projection system with low throw ratio and high light efficiency |
| CN107526236A (en) * | 2017-09-29 | 2017-12-29 | 鲜善洪 | A kind of polarized light separator and optical projection system |
| CN110221526A (en) * | 2018-03-01 | 2019-09-10 | 联士光电（深圳）有限公司 | A kind of exposure machine based on LCOS technology |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: Cui Jing Road Shenzhen City, Guangdong province 518118 Pingshan New District No. 35 No. 1 Building 6 East Patentee after: Butterfly Technology (Shenzhen) Limited Address before: 518055, 301, two, Fengyun technology building, Fifth Industrial Zone, North Ring Road, Shenzhen, Guangdong, Nanshan District Patentee before: Butterfly Technology (Shenzhen) Limited |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090304 |