CN1204438C - Polarizing conversion light-pipe for projection display - Google Patents
Polarizing conversion light-pipe for projection display Download PDFInfo
- Publication number
- CN1204438C CN1204438C CN 03127078 CN03127078A CN1204438C CN 1204438 C CN1204438 C CN 1204438C CN 03127078 CN03127078 CN 03127078 CN 03127078 A CN03127078 A CN 03127078A CN 1204438 C CN1204438 C CN 1204438C
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- present
- projection display
- light
- wave plate
- beam apparatus
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- Projection Apparatus (AREA)
Abstract
The present invention belongs to the technical field of projection display and provides a new polarization converting light pipe used for projection display. The new polarization converting light pipe comprises cover plate glass 2-1, a high reflection film 2-2, a high reflection film 2-4, a quarter wave plate 2-3, an entrance light hole 2-5, a polarizing beam splitter 2-6 and a light homogenizing rod 2-7. The present invention uses a large angle wide waveband polarization light beam splitter of which the end surface is plated with the high reflection films, and the quarter wave plate which replace two polarizion beam splitters in the background technique; because the present invention is in simple structure, the present invention reduces the difficulty of the technology and production cost, the transmission efficiency of the present invention can reach 70% to 80% for causing the brightness of projection display systems to be enhanced by more than 20 % and to approach to the performance of foreign products; the size of the present invention can be designed according to user requirements and can not influence the integral structures of projection systems. The present invention enhances light energy utilization efficiency, simultaneously performs a homogenization function to incident light and finally increases the brightness of projection display.
Description
Technical field: the invention belongs to the projection display technique field, relate to a kind of improvement, be mainly used in the brightness that improves Projection Display to the polarization conversion light pipe.
Background technology: along with developing rapidly of display technique, the raising of Projection Display brightness has become one of gordian technique that limits its development.In order to improve the high brightness of Projection Display, external product mainly contains following several at present: polarization recovery light pipe (PRLP), polarization conversion light pipe (PCLP and L-PCLP).They can be used for transmissive liquid crystal display and reflection type liquid crystal display system, comprise pre-projecting type optical projection system, back projection type optical projection system and large screen television.The key property of this type of device is: increase optical transmission efficient; Light is played homogenization; Need not rise in advance partially etc.
External at present existing polarization conversion light pipe mainly comprises: incident light 1, anti-reflection film 2 and 6, polarization beam apparatus 3, half-wave plate 4, integrator rod 5.As shown in Figure 1, two polarization beam apparatus 3 bond together and form end face a and end face b, are coated with anti-reflection film 2 at end face a, and incident light 1 is from the lower end incident of end face a; End face b and integrator rod 5 are fixedly linked, and the upper end between integrator rod 5 and polarization beam apparatus 3 is fixedly connected with half-wave plate 4, and c has been coated with anti-reflection film 6 in the other end of integrator rod 5.The key of this kind device is the making of broadband wide angle film-type polarization beam apparatus, the rete number that this film-type polarization beam apparatus need be coated with is more, and obtain preferable performance and need use multiple Coating Materials, requirement is high on the technology, manufacture difficulty is big, the cost height, and the structure of this kind polarization recovery light pipe will be used two such polarization beam apparatus, this just corresponding manufacture difficulty and manufacturing cost of having increased.
Invention detailed content: problem such as, cost height big for the manufacture difficulty that solves polarization recovery light pipe in the background technology, the objective of the invention is to provide a kind of novel polarization conversion light pipe that is used for Projection Display, reduced technology difficulty and production cost to a certain extent.
Novel optical rotation light pipe proposed by the invention includes: cover-plate glass, two highly reflecting films, quarter-wave plate, entrance pupil, polarization beam apparatus, integrator rod.As shown in Figure 2, incident light is coated with anti-reflection film from being positioned at the entrance pupil incident at cover-plate glass end face e center at the end face d of cover-plate glass, is coated with first highly reflecting films around the entrance pupil; The end face e and the quarter-wave plate of cover-plate glass are fixedly linked, and quarter-wave plate is fixedly linked with polarization beam apparatus again, are coated with second highly reflecting films at the end face f of polarization beam apparatus; Polarization beam apparatus is fixedlyed connected with integrator rod, is coated with anti-reflection film at the end face g of integrator rod.
During work of the present invention:
Incident light incides polarization beam apparatus from the entrance pupil at glass cover-plate end face e center, and P light transmission polarization beam apparatus also enters integrator rod; And the S light of reflection is reflected by highly reflecting films and turn back to polarization beam apparatus, and then by polarization beam apparatus reflection and arrive the end face e of glass cover-plate via quarter-wave plate, wherein a big chunk is by the highly reflecting films reflection of the end face e of glass cover-plate, and the process quarter-wave plate enters integrator rod through polarization beam apparatus after becoming P light once more; Integrator rod plays homogenization to the P light of incident.
Good effect of the present invention:
The present invention has mainly utilized wide-angle broadband polarized light beam splitter and quarter-wave plate of end face plating highly reflecting films, they have replaced two polarization beam apparatus in the background technology product, owing to adopt simpler structure of the present invention, reduced technology difficulty and production cost.The efficiency of transmission of this novel polarization conversion light pipe can reach 70%～80%, can make the brightness of projection display system improve more than 20%, is close with the performance of external product.Size of the present invention can design according to customer requirements, can not influence the one-piece construction of optical projection system.Polarization recovery light pipe of the present invention has not only been realized the raising of optical energy utilization efficiency, simultaneously incident light has been played the effect of homogenize, finally plays the purpose that increases Projection Display brightness.
Description of drawings:
Fig. 1 is the structural representation of background technology
Fig. 2 is a structure cut-open view of the present invention
Embodiment: as shown in Figure 2: the present invention includes: cover-plate glass 2-1, the first highly reflecting films 2-2 and the second highly reflecting films 2-4, quarter-wave plate 2-3, entrance pupil 2-5, polarization beam apparatus 2-6, integrator rod 2-7.
Cover-plate glass 2-1: the surface quality of its two end face d and e is 80/50, the anti-reflection film of end face d is the incident light in the 430-650nm for F/# in (in air), wavelength coverage between 2～3, realize reflectivity R＜0.5%, Coating Materials adopts ZRO2 and MGF2 material, obtains by optimal design;
The first highly reflecting films 2-2 and the second highly reflecting films 2-4: adopt metal enhancement mode highly reflecting films, be that the aluminium film adds deielectric-coating, deielectric-coating is with SIO2 and ZRO2, and deielectric-coating is optimized design, make and in the 400-700nm wavelength coverage, realize the high reflection of wide angle, average reflectance R＞95%;
Quarter-wave plate 2-3: the centre wavelength of employing is 525 ± 20nm, and the material of employing is mica or quartz, and each limit of its main shaft and its becomes 45 ± 1 degree angles;
Light hole 2-5: its big I is decided according to concrete designing requirement.
Polarization beam apparatus 2-6: the novel polarization beam apparatus that is adopted is broadband, wide angle polarization beam splitting, and higher extinction ratio is arranged, and the polarized component of expecting is had high transmittance and reflectivity.By optimal design make in the 420-680nm wavelength coverage, the incident light of F/# between 2～3 (in air), satisfy T
p＞90%, T
s＜0.5%.
Integrator rod 2-7: the surface quality of its six faces is 80/50, and the verticality of end face is ± 10 ', faces parallel is ± 3 ', the anti-reflection film of end face g is consistent with the anti-reflection film of cover-plate glass 2-1 end face d.
Cover-plate glass 2-1, polarization beam apparatus 2-6 and integrator rod 2-7 material therefor are BK7 optical glass.
All retes can adopt the method for electron beam evaporation to be coated with, and utilize the light-operated method that combines with the quartz crystal oscillating phase to carry out thicknesses of layers control.
Claims (1)
1, the polarization conversion light pipe in the Projection Display, include: cover-plate glass (2-1), entrance pupil (2-5), integrator rod (2-7), it is characterized in that also comprising: first highly reflecting films (2-2) and second highly reflecting films (2-4), quarter-wave plate (2-3), polarization beam apparatus (2-6) are coated with first highly reflecting films (2-2) around entrance pupil (2-5); The end face (e) of cover-plate glass (2-1) and quarter-wave plate (2-3) are fixedly linked, and quarter-wave plate (2-3) is fixedly linked with polarization beam apparatus (2-6) again, are coated with second highly reflecting films (2-4) at the end face (f) of polarization beam apparatus (2-6); Polarization beam apparatus (2-6) is fixedlyed connected with integrator rod (2-7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03127078 CN1204438C (en) | 2003-06-13 | 2003-06-13 | Polarizing conversion light-pipe for projection display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03127078 CN1204438C (en) | 2003-06-13 | 2003-06-13 | Polarizing conversion light-pipe for projection display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1470903A CN1470903A (en) | 2004-01-28 |
| CN1204438C true CN1204438C (en) | 2005-06-01 |
Family
ID=34153182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03127078 Expired - Fee Related CN1204438C (en) | 2003-06-13 | 2003-06-13 | Polarizing conversion light-pipe for projection display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1204438C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7357511B2 (en) * | 2005-03-23 | 2008-04-15 | 3M Innovative Properties Company | Stress birefringence compensation in polarizing beamsplitters and systems using same |
| CN102314064A (en) * | 2011-08-25 | 2012-01-11 | 北京亚视创业科技发展有限公司 | Composite light tunneling used for projector (projection apparatus) |
| CN113721414A (en) * | 2020-05-25 | 2021-11-30 | 深圳光峰科技股份有限公司 | Prism assembly, light-emitting device and projection system |
-
2003
- 2003-06-13 CN CN 03127078 patent/CN1204438C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1470903A (en) | 2004-01-28 |
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