CN101169520A - Polarized light conversion device for liquid crystal projection display - Google Patents
Polarized light conversion device for liquid crystal projection display Download PDFInfo
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- CN101169520A CN101169520A CNA200610131637XA CN200610131637A CN101169520A CN 101169520 A CN101169520 A CN 101169520A CN A200610131637X A CNA200610131637X A CN A200610131637XA CN 200610131637 A CN200610131637 A CN 200610131637A CN 101169520 A CN101169520 A CN 101169520A
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- microlens array
- light
- polarized light
- calcite crystal
- lenslet
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Abstract
The invention belongs to the field of liquid projective display technology, in particular to a polarized light converting device. The invention comprises a first microlens array, a slit grating, a second microlens array, a calcite crystalloid and a plurality of half-wave plates. A light beam spatial segmentation part is constituted by the first microlens array, the slit grating and the second microlens array. The calcite crystalloid is a polarized light separating element, and the half-wave plate is an optical rotary element. The working aperture angle of the polarized light converting device is between -7 degrees and 7 degrees, and the light converting efficiency can reach 86.1 percent. The extinction ratio of the output line polarized light is superior to 10<-4>. The invention also has excellent advantages of simple manufacture, stable performance and high threshold value of optical damage resistance, etc.
Description
Technical field:
The invention belongs to liquid crystal (Liquid Crystal Display) projection display technique field, particularly relate to a kind of polarization conversion system.
Background technology:
In recent years, the development of crystal projection display technique is very rapid, and giant-screen, high-definition image are that it is subjected to the extensively major reason of attention.It not only has advantages such as high brightness, high resolving power, high information capacity, and volume is little, convenient, portable, it is a kind of welcome display device, can be widely used in multimedia teaching, home theater, meeting demonstration, even in the military command system, therefore, further R and D image wide-screen curtain projection display technique is very significant, and very strong practical value is arranged.In liquid crystal projection display systems, polarization conversion system PCS (Polarizing Conversion System) is unusual one of important components, and its performance has very big influence to light utilization efficiency, contrast and the pattern colour saturation degree of optical projection system.Because liquid crystal display device must could be realized Presentation Function down by online polarizing light irradiation, and the function of polarized light conversion device is that random polarization (light beam that sends such as the UHP bulb) is converted to linearly polarized light, so polarized light conversion device is extensive use of in the LCD projector.Be to be subdivided into light pencil equal at interval, that width equates the prior art (as Fig. 1) by a pair of fly eye lens array 11 and the 12 random polarization light beam spaces that light source is sent, these light beam irradiates replace evaporation PBS film 21 and reflectance coating 22 in the PBS array 20 on polarizing-splitting prism PBS (Polarization Beam Splitter) array 20 following closely.The illumination light of being segmented by fly eye lens array enters corresponding PBS prism, is resolved into the orthogonal linearly polarized light s of direction of vibration light 41 and p light 42 by PBS film 21.S light component is wherein entered adjacent area by the reflection of PBS film, transmits prism after film 22 reflections that are reflected; The p light component sees through the PBS film, owing to post half-wave plate 30 at its respective regions that transmits, makes p polarisation of light direction half-twist, and is consistent with the direction of vibration of s light, thereby obtains linearly polarized light.The extinction ratio not high (2 * 10 of the linearly polarized light of this polarized light conversion device output
-3About) and exceed in the angle of divergence of incident beam ± 3 ° the time, the s attitude light leak in the p light increases, and the rapid deterioration of the extinction ratio of linearly polarized light has a strong impact on the contrast of system; When lighting source intensity was very high, the PBS film was subjected to thermal stress big in addition, and serviceability descends.
Summary of the invention:
At above shortcoming of the prior art, the purpose of this invention is to provide a kind of polarization light output extinction ratio height that has, the work aperture angle is big, the polarized light conversion device of Heat stability is good.
For realizing described purpose, comprise among the present invention: light beam space segmentation part, polarization separating element and optically-active element.Light beam space segmentation part is made up of first, second microlens array and slit grating; Polarization separating element is a calcite crystal; The optically-active element is a half-wave plate.
The effect of light beam space segmentation part is: the quasi-parallel light beam that sends when light source incides light beam space segmentation part, first microlens array is divided into the some light pencils identical with lenslet dimension with whole angle pencil of ray, throw light on thereby a light source is divided into a plurality of light sources, each lenticule all becomes the picture of a light source in its focal plane; Second microlens array in the infinite distance, not only plays the effect with the light beam segmentation, evenly light distribution with the lenslet overlapping imaging of front-seat array correspondence.Slit grating is positioned at the place, focal plane of first microlens array, plays the effect that stops lenticule edge parasitic light, to improve the extinction ratio of output light.The effect of calcite crystal is: when the vertical cleavage plane incident of random polarization, because the architectural characteristic of calcite crystal, its optical axis and cleavage plane be at 45 23 ' and, random polarization will be broken down into direction of vibration orthogonal linearly polarized light o light and e light.The direction of vibration vertical optical axis of o light (also vertical incidence face), the direction of propagation is constant; The direction of propagation of e light and o light have certain included angle.E light is by after being attached to the strip half-wave plate on the crystal, and its direction of vibration is rotated 90 °, and is consistent with the direction of vibration of o light, so obtain the linearly polarized light of polarization direction unanimity.
Because employed calcite crystal work aperture angular region be ± 7 °, greater than the PBS prism ± 3 °, and it exports polarisation of light degree also than the height of PBS prism.So, utilize the birefringent characteristic of calcite crystal, the utilization ratio that can obtain light is up to 86.1%, and the extinction ratio of output light is better than 10
-4, and this polarization conversion device has making simply, stable performance, good characteristics such as optic damage threshold value height.
Description of drawings
Fig. 1 is the structural drawing of background technology polarization conversion system.
Fig. 2 is the structural drawing of polarization conversion system 1 of the present invention.
Fig. 3 is the structural drawing of polarization conversion system 2 of the present invention.
Embodiment:
The present invention includes first microlens array 11, second microlens array 12, slit grating 13, calcite crystal 20, some half-wave plates 30.First microlens array 11 equates with the logical light area of second microlens array 12; Slit grating is at the place, focal plane of first microlens array, and the light-blocking part branch is between o light 41 light paths and e light 42 light paths; The optical axis of calcite crystal 20 and its cleavage plane angle are: 45 ° 23 '; 30 of half-wave plates stick on the zone that e light 42 passes through, the direction of vibration angle at 45 of its main shaft and e light 42, and width equates with the peak width that passes through of e light 42.
Embodiment 1
Be followed successively by along the light ray propagation direction: first microlens array 11, slit grating 13, second microlens array 12, calcite crystal 20 and half-wave plate 30.First microlens array and second microlens array have a common focal plane; Second first face with calcite crystal of second microlens array is pasted together; The half-wave plate of strip equally spaced sticks on second of calcite crystal.Apparatus structure as shown in Figure 2.Realize the polarized light translation function, must satisfy:
1. the first microlens array focal length is two times of the second microlens array focal length;
2. the cambered surface width of each lenslet is two times of each lenslet cambered surface width on second microlens array on first microlens array, the cambered surface equal in length;
3. along the cambered surface length direction, the optical axis coincidence of 2n-1 row lenslet on the optical axis of n row lenslet and second microlens array on first microlens array;
4. first microlens array and second microlens array have a common focal plane, and promptly focus is joined;
5. the thickness of kalzit is 9.2 times of each lenslet cambered surface width on second microlens array.
Satisfying under the situation of above condition, structural parameters of the present invention can for: the area of first microlens array is 9 * 12mm
2, comprising 3 * 6 of lenslets, the area of each lenslet is 3 * 2mm
2The second microlens array area is 9 * 12mm
2, comprising 6 * 6 of lenslets, the area of each lenslet is 1.5 * 2mm
2The calcite crystal volume is 13.8 * 13.8 * 13.8mm
3The wide 2mm of the shield bars of slit grating; Every half-wave plate area is 1.5 * 12mm
2
In this polarization conversion system, the random polarization light beam of quasi-parallel incides light beam space segmentation part, first microlens array is divided into the some light pencils identical with lenslet dimension with whole angle pencil of ray, throw light on thereby a light source is divided into a plurality of light sources, each lenticule all becomes the picture of a light source in its focal plane; Second microlens array in the infinite distance, not only plays the effect with the light beam segmentation, evenly light distribution with the lenticule overlapping imaging of front-seat array correspondence.Cleavage plane incident by the vertical calcite crystal of random polarization light beam after equal even segmentations will be broken down into direction of vibration orthogonal linearly polarized light o light and e light.The direction of vibration vertical optical axis of o light (also vertical incidence face), the direction of propagation is constant, and the direction of propagation and the optical axis of e light have certain included angle.Exit facet at calcite crystal, o light outgoing zone and e light outgoing zone join but do not have intersection, we only paste half-wave plate in e light outgoing zone, so when e light by after being attached to the strip half-wave plate on the crystal, its direction of vibration is rotated 90 °, and is just consistent with the direction of vibration of o light, and o light outgoing zone does not have half-wave plate, so its polarization direction is constant, so obtain the linearly polarized light of polarization direction unanimity.Slit grating is positioned at the place, focal plane of first microlens array, plays the effect that stops lenticule edge parasitic light, avoids the extinction ratio of polarization light output to reduce.
Embodiment 2
Be followed successively by along the light ray propagation direction: calcite crystal 20, first microlens array 11, slit grating 13, half-wave plate 30 and second microlens array 12.Second first face with first microlens array of calcite crystal is pasted together; Second microlens array is positioned near the focal plane of first microlens array; The half-wave plate of strip equally spaced sticks on first of second microlens array.Structure as shown in Figure 3.Realize the polarized light translation function, also need to make: the refractive index of first microlens array equates with the unusual optical index of calcite crystal.
Satisfying under the situation of above condition, structural parameters of the present invention can for: the area of first, second microlens array is 9 * 12mm
2, comprising 3 * 3 of lenslets, the area of each lenslet is 3 * 4mm
2, material is a QK3 glass; The calcite crystal volume is 1 * 9 * 12mm
3
In this polarization conversion system, when the cleavage plane incident of the vertical calcite crystal of random polarization light beam of quasi-parallel, it will be broken down into the orthogonal linearly polarized light of two bundle direction of vibration: o light and e light.The direction of vibration vertical optical axis of o light (the also vertical light plane of incidence), the direction of propagation is constant; The direction of propagation of e light and o light have certain included angle.When the cemented surface of e light by the calcite crystal and first microlens array, because the refractive index of first microlens array equates with the unusual optical index of calcite crystal, so the direction of propagation and the angle of o light of e light when entering first microlens array is constant, guarantee that two light beams are converged at different points by first microlens array, throw light on thereby a light source is divided into a plurality of light sources, each lenticule all becomes the picture of two light sources in its focal plane.Second microlens array is positioned near the focal plane of first microlens array, with each lenticule imaging on liquid crystal panel in first microlens array of correspondence, plays the effect of even light distribution.E light is by after being attached to the strip half-wave plate on second microlens array, and its direction of vibration is rotated 90 °, and is consistent with the direction of vibration of o light, so obtain the linearly polarized light of polarization direction unanimity.Slit grating is positioned at the place, focal plane of first microlens array, plays the effect that stops lenticule edge parasitic light, avoids the extinction ratio of polarization light output to reduce.
Claims (3)
1. polarized light conversion device of the present invention comprises: light beam space segmentation part, polarization separating element and optically-active element.Light beam space segmentation part is made up of first microlens array (11), second microlens array (12) and slit grating (13); The optically-active element is half-wave plate (30).It is characterized by: polarization separating element is calcite crystal (20).By different combinations, realize example 1 and 2 two kinds of polarisation transformational structures of example.
2. polarized light conversion device according to claim 1 is characterized in that: first microlens array (11) focal length is two times of second microlens array (12) focal length; The cambered surface width that first microlens array (11) is gone up each lenslet is two times that second microlens array (12) is gone up each lenslet cambered surface width, the cambered surface equal in length; Along the cambered surface length direction, the optical axis of the last n row lenslet of first microlens array (11) and the optical axis coincidence of the last 2n-1 row lenslet of second microlens array (12); First microlens array (11) has a common focal plane with second microlens array (12), and promptly focus is joined; The thickness of calcite crystal (20) is 9.2 times that second microlens array (12) is gone up each lenslet cambered surface width; Along the light ray propagation direction, on second that second first face with calcite crystal (20) of second microlens array (12) is pasted together, half-wave plate (30) sticks on calcite crystal (20).
3. polarized light reforming unit according to claim 1, it is characterized in that: along the light ray propagation direction, second first face with first microlens array (11) of calcite crystal (20) is pasted together, and half-wave plate (30) sticks on first of second microlens array (12); The refractive index of first microlens array (11) material therefor and the unusual optical index n of calcite crystal (20)
eEquate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610131637XA CN101169520A (en) | 2006-11-16 | 2006-11-16 | Polarized light conversion device for liquid crystal projection display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610131637XA CN101169520A (en) | 2006-11-16 | 2006-11-16 | Polarized light conversion device for liquid crystal projection display |
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| CN101169520A true CN101169520A (en) | 2008-04-30 |
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| CNA200610131637XA Pending CN101169520A (en) | 2006-11-16 | 2006-11-16 | Polarized light conversion device for liquid crystal projection display |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846285B (en) * | 2009-03-24 | 2011-09-28 | 李继红 | Multifunctional optical module |
| CN102364563A (en) * | 2011-11-07 | 2012-02-29 | 广东威创视讯科技股份有限公司 | Device for eliminating splicing seam of light crystal display (LCD) screen and application method of device |
| CN105911804A (en) * | 2015-02-25 | 2016-08-31 | 全视技术有限公司 | Spatially-Interleaved Polarization Converter For LCOS Display |
| CN106918921A (en) * | 2017-04-26 | 2017-07-04 | 北京镭创高科光电科技有限公司 | A kind of laser display based on fly's-eye lens is polarized shimming apparatus for shaping |
| CN110998434A (en) * | 2019-11-28 | 2020-04-10 | 重庆康佳光电技术研究院有限公司 | Optical projection imaging system and method |
| CN111213083A (en) * | 2017-08-25 | 2020-05-29 | Nkt光子学有限公司 | Depolarizing homogenizer |
| CN114114814A (en) * | 2021-10-21 | 2022-03-01 | 成都派斯光学有限公司 | Dynamic projection system suitable for automobile |
| CN116068694A (en) * | 2023-03-23 | 2023-05-05 | 北京深光科技有限公司 | Polarization conversion component based on micro-nano structure |
-
2006
- 2006-11-16 CN CNA200610131637XA patent/CN101169520A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846285B (en) * | 2009-03-24 | 2011-09-28 | 李继红 | Multifunctional optical module |
| CN102364563A (en) * | 2011-11-07 | 2012-02-29 | 广东威创视讯科技股份有限公司 | Device for eliminating splicing seam of light crystal display (LCD) screen and application method of device |
| CN105911804A (en) * | 2015-02-25 | 2016-08-31 | 全视技术有限公司 | Spatially-Interleaved Polarization Converter For LCOS Display |
| CN105911804B (en) * | 2015-02-25 | 2017-09-01 | 豪威科技股份有限公司 | Polarization converter for LCoS projection display device LCOS spatial intersecting |
| CN106918921A (en) * | 2017-04-26 | 2017-07-04 | 北京镭创高科光电科技有限公司 | A kind of laser display based on fly's-eye lens is polarized shimming apparatus for shaping |
| CN111213083A (en) * | 2017-08-25 | 2020-05-29 | Nkt光子学有限公司 | Depolarizing homogenizer |
| CN110998434A (en) * | 2019-11-28 | 2020-04-10 | 重庆康佳光电技术研究院有限公司 | Optical projection imaging system and method |
| CN114114814A (en) * | 2021-10-21 | 2022-03-01 | 成都派斯光学有限公司 | Dynamic projection system suitable for automobile |
| CN116068694A (en) * | 2023-03-23 | 2023-05-05 | 北京深光科技有限公司 | Polarization conversion component based on micro-nano structure |
| CN116068694B (en) * | 2023-03-23 | 2023-05-30 | 北京深光科技有限公司 | Polarization conversion component based on micro-nano structure |
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