CN1540392A - Reflecting type device for displaying light by liquid crystal - Google Patents
Reflecting type device for displaying light by liquid crystal Download PDFInfo
- Publication number
- CN1540392A CN1540392A CNA2003101030519A CN200310103051A CN1540392A CN 1540392 A CN1540392 A CN 1540392A CN A2003101030519 A CNA2003101030519 A CN A2003101030519A CN 200310103051 A CN200310103051 A CN 200310103051A CN 1540392 A CN1540392 A CN 1540392A
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- type liquid
- reflection type
- polarized light
- light
- liquid crystal
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 39
- 239000003086 colorant Substances 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- 230000010287 polarization Effects 0.000 claims description 49
- 230000005540 biological transmission Effects 0.000 claims description 8
- KPHWPUGNDIVLNH-UHFFFAOYSA-M diclofenac sodium Chemical compound [Na+].[O-]C(=O)CC1=CC=CC=C1NC1=C(Cl)C=CC=C1Cl KPHWPUGNDIVLNH-UHFFFAOYSA-M 0.000 claims description 8
- 238000007747 plating Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 abstract 1
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 4
- 230000008033 biological extinction Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 241001062009 Indigofera Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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Abstract
The device includes light source module, dividing/merging light system, and projecting lens. The dividing/merging light system includes polarizer, two wave plates with wide waveband, polarized light splitter, plane dichroic mirror coated by two-color spectrum film, analyzer and three reflection type liquid crystals for modulating red, green and blue colors. Polarized light from light source and dividing/merging light system passing through polarizer and first wave plate with wide waveband enters into polarized light splitter. Light beam reflected from polarized light splitter enters into reflection type liquid crystal; and light beam transmitted from polarized light splitter enters into other two reflection type liquid crystals. Reflected light beams modulated by three reflection type liquid crystals returned back along original optical paths passing through polarized light splitter, second wave plate and analyzer are projected to projecting lens.
Description
Technical field
The invention belongs to optical instrument field, relate in particular to a kind of crystal projection instrument.
Background technology
Crystal projection technology has in recent years obtained great development, the especially development of reflection type liquid crystal display technique, and be widely used in fields such as amusement, office, education.This technology has improved people's quality of life, has driven social economic development.
General LCD projecting system is by light source assembly, light engine, and the first-class element of projection lens is formed.Light source assembly generally comprises lighting source, collimation lens set (diverging light of lighting source emission is become parallel beam), light filter (infrared and ultraviolet light in the elimination light beam), polaroid (the natural polarized light of light source is become linearly polarized light).In light engine, the light beam of light source is divided into redgreenblue, and tri-color beam is carried out intensity modulation by three reflection type liquid crystals (for example, present LCOS chip) respectively; Light engine is combined into three coloured light a branch of again, projects projection lens and form image on screen.
Open day on January 9th, 2002, publication number is to disclose in Chinese invention patent " LCD projector " prospectus of CN1330280A a kind ofly to contain rhombic prism three looks and close/LCD projector of minute photo engine, its structure comprises polarization spectroscope 1, rhombic prism 2, compensating prism 3, projection lens 4 and liquid crystal 5,6,7 as shown in Figure 1.The light beam that light source assembly 100 penetrates is through the light engine beam split, modulation, close light after, by projection lens 4, project on the screen.The deficiency of this kind LCD projector is: the light engine of (1) this LCD projector requires high to the plated film of rhombic prism, because existing coating technique is difficult to make high-quality Amici prism, make the processing of rhombic prism have difficulties, particularly there is certain difficulty in industrialization production; (2) branch of this LCD projector/closing photosystem need little focal length and the camera lens that very big rear cut-off distance is arranged.This design to projection lens brings very big difficulty, has also increased the production cost of camera lens.
The inventor has applied for patent of invention " reflection type liquid crystal display machines " on June 24th, 2002, application number is 03137757.2, mentioned a kind of reflection type liquid crystal as shown in Figure 2 in this patent application and shown ray machine, the branch of this ray machine/close photosystem comprises two polaroids, two wide wavestrip wave plates, polarization spectroscope, dichronic mirrors and can distinguish three reflection type liquid crystals of modulated red, green, blue three color light; Described polarization spectroscope is a prism of being made up of two triangular prisms, is coated with wide wavelength polarization beam splitter on the public cemented surface of two triangular prisms; Described dichronic mirror is a planar dichroic mirror that is coated with double-colored spectro-film.The advantage that this ray machine has is simple in structure, cost is low, be convenient to produce.But the difficult shortcoming that improves of a contrast is arranged also.Existing common polarization spectroscope has good extinction ratio to reflected light, and the extinction ratio of transmitted light is relatively poor.The extinction ratio height is the contrast height of projection then.In actual applications, need, often planar dichroic mirror is used for sharing out bonus, blue light owing to consider the plated film of planar dichroic mirror.That is to say that green glow is to be polarized the spectroscope transmission, red, indigo plant is polarized the spectroscope reflection.So the contrast of the projection ray machine green glow of this structure is not high relatively.But because most of concentration of energy (energy of green glow is the several times of red blue light energy sum) on green glow of projection ray machine so just weakens the contrast of ray machine integral body greatly.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of simple in structure, production cost is low, and technical requirement is low, the LCD projector that is beneficial to large-scale production that contrast is high.
The solution of the present invention is as follows: a kind of reflection type liquid crystal shows ray machine, comprise light source assembly, divide/close photosystem and projection lens, it is characterized in that: described branch/close photosystem comprises the polarizer, two wide wavestrip wave plates, polarized light splitting device, the planar dichroic mirror that is coated with double-colored spectro-film, analyzer, and three reflection type liquid crystals can distinguishing modulated red, green, blue three color light;
The polarized light that goes out to inject branch/close photosystem from described light source assembly enters polarized light splitting device through the polarizer, the first wide wavestrip wave plate, incide on first reflection type liquid crystal from one road light beam of polarized light splitting device reflection,, after described dichronic mirror beam split, incide respectively on two other reflection type liquid crystal from another road light beam of polarized light splitting device transmission; Return along original optical path through the folded light beam after three reflection type liquid crystal modulation, project described projection lens through described polarized light splitting device, the second wide wavestrip wave plate and analyzer.
The polarization spectroscope that polarized light splitting device described in the present invention is made up of two triangular prisms is coated with wide wavelength polarization beam splitter or engraves the grating with polarization spectro function on the public cemented surface of two triangular prisms.
Polarized light splitting device described in the present invention can also be the plane polarization spectroscope that has the grating of polarization spectro function or plate polarization beam splitter in the transparent plate substrate.
Described wide wavestrip wave plate is a wave plate that only single primary colours is worked, or the wave plate that the light of two kinds of colors is worked.
Described wide wavestrip wave plate is that two wave plate stacks of only single primary colours being worked are formed.
Double-colored in the double-colored spectro-film of described dichronic mirror plating is any two kinds of colors in the red, green, blue three primary colours.
The polarizer described in the present invention is polaroid or grating with polarization spectro function.
Analyzer described in the present invention is polaroid or grating with polarization spectro function.
Branch of the present invention/close the required optical device of photosystem is less, the contrast height, and debugging and location are convenient.These characteristics of the present invention will reduce projector's cost, make the easier family that enters of LCD projector.
Description of drawings
Fig. 1 is the structural representation of existing disclosed LCD projector.
Fig. 2 is the structural representation in the LCD projector of preceding application for a patent for invention.
Fig. 3 is the structural representation of embodiments of the invention one.
Fig. 4 is the structural representation of embodiments of the invention two.
Fig. 5 is the structural representation of embodiments of the invention three.
Fig. 6 is the structural representation of embodiments of the invention four.
Embodiment
Below in conjunction with the description of drawings composition of the present invention and the course of work:
As shown in Figure 3, Figure 4, light source assembly of the present invention comprises lighting source, collimation lens set, light filter and polaroid, the polarization spectroscope that divides/close the polarized light splitting device of photosystem to be made up of two triangular prisms in these two embodiment is coated with wide wavelength polarization beam splitter or engraves the grating with polarization spectro function on the public cemented surface of two triangular prisms.The grating that the polarizer and analyzer adopt polaroid or have the polarization spectro function.
According to go out to inject branch/close photosystem from light source assembly is P polarized light or S polarized light, and two kinds of situations can be arranged:
1) if is P polarized light 8 from the light source assembly outgoing.The A of P polarization state, B, C (representing a kind of combination of red, green, blue three coloured light) three coloured light are purified through the polarizer 9 so, incide the first wide wavestrip wave plate 10 then, change the P polarized light of A color of light into the S polarized light, and all the other two kinds of light still are the P polarized light.This three-beam incides polarization spectroscope (PBS) 11 then, and A color polarized light is reflected through polarization spectroscope 11, and B, C color polarized light are through the directly transmission of polarization spectroscope quilt.After the P polarized light of B, two kinds of colors of C transmits from polarization spectroscope, through a planar dichroic mirror 12 with the angled double-colored spectro-film of plating in polarization spectroscope surface, with a kind of reflection in B, the C color of light, another transmission realizes B, C beam split.The final like this beam split that has realized A, B, C three coloured light has just realized the beam split of red, green, blue three looks.Three coloured light finally impinge upon the surface of three reflection type liquid crystals respectively.If the light through three liquid crystal 5,6 and 7 reflections by liquid crystal modulating polarization attitude 90 ° of rotations is taken place respectively, the A light that reflects through liquid crystal (polarization state is P) is directly from the polarization spectroscope transmission so; B, C light (polarization state is S) through liquid crystal reflection arrive polarization spectroscope after dichronic mirror closes light, be polarized the spectroscope reflection, have so just realized the light that closes of A, B, C three coloured light, have just realized the light that closes of red, green, blue three coloured light.Close light beam behind the light through the projection lens projection, the bright attitude that project this moment.
If the light through liquid crystal reflection is not rotated by liquid crystal modulating polarization attitude, what then obtain by projection lens is dark attitude.Change the deflection angle that modulation voltage on the liquid crystal can change the light that reflects from liquid crystal, just can obtain different gray scales through the projection lens projection.In order further to improve performance, before projection lens, add second wide wavestrip wave plate 13 and the analyzer 14.The effect of the second wide wavestrip wave plate is that the polarization state of A, B, C three coloured light is identified, and the effect of analyzer is once more projected light to be purified.
2) if be S polarized light 8 from the light source assembly outgoing, the A of S polarization state, B, C (representing a kind of combination of red, green, blue three coloured light) three coloured light are through behind the polarizer 9 so, incide the first wide wavestrip wave plate 10, change the S polarized light of A, two kinds of color of light of B into the P polarized light, C light still is the S polarized light.Then, this three-beam incides polarization spectroscope 11, and by transmission, C color polarized light directly reflects through polarization spectroscope through polarization spectroscope for A, B color polarized light.After in like manner the P polarized light of A, two kinds of colors of B came out from polarization spectroscope, by the dichronic mirror beam split, with a kind of reflection wherein, another transmission realized A, B beam split.Finally realize the beam split of A, B, C three coloured light, just realized the beam split of red, green, blue three looks.Close the principle and the 1st of light) the kind situation is similar.
Fig. 5 and embodiment illustrated in fig. 6 in polarized light splitting device adopt have the grating of polarization spectro function or in the transparent plate substrate plane polarization spectroscope of plating polarization beam splitter, the grating that the polarizer and analyzer adopt polaroid or have the polarization spectro function.The course of work of describing in the course of work of ray machine and the previous embodiment is identical.
Employing has the grating branch of polarization spectro function/close photosystem and has lot of advantages: (1) extinction ratio does not change with the change of incident angle of light; (2) good heat dissipation does not exist because heat firmly causes the birefringent problem of glass.These advantages can improve the contrast of projection ray machine greatly.
The ColorSelect wave plate that wide wavestrip wave plate among the present invention can adopt U.S. ColorLink company to provide.Grating with polarization spectro function can be U.S. MOXTEK company wire grating polaroid (WGP).
Claims (9)
1. a reflection type liquid crystal shows ray machine, comprise light source assembly, divide/close photosystem and projection lens, it is characterized in that: described branch/close photosystem comprises the polarizer, two wide wavestrip wave plates, polarized light splitting device, the planar dichroic mirror that is coated with double-colored spectro-film, analyzer, and three reflection type liquid crystals can distinguishing modulated red, green, blue three color light;
The polarized light that goes out to inject branch/close photosystem from described light source assembly enters polarized light splitting device through the polarizer, the first wide wavestrip wave plate, incide on first reflection type liquid crystal from one road light beam of polarized light splitting device reflection,, after described dichronic mirror beam split, incide respectively on two other reflection type liquid crystal from another road light beam of polarized light splitting device transmission; Return along original optical path through the folded light beam after three reflection type liquid crystal modulation, project described projection lens through described polarized light splitting device, the second wide wavestrip wave plate and analyzer.
2. reflection type liquid crystal according to claim 1 shows ray machine, it is characterized in that: the polarization spectroscope that described polarized light splitting device is made up of two triangular prisms is coated with wide wavelength polarization beam splitter or engraves the grating with polarization spectro function on the public cemented surface of two triangular prisms.
3. reflection type liquid crystal according to claim 1 shows ray machine, and it is characterized in that: described polarized light splitting device is the grating with polarization spectro function.
4. reflection type liquid crystal according to claim 1 shows ray machine, it is characterized in that: described polarized light splitting device is the plane polarization spectroscope of plating polarization beam splitter in the transparent plate substrate.
5. show ray machine according to claim 1,2,3 or 4 described reflection type liquid crystals, it is characterized in that: described wide wavestrip wave plate is a wave plate that only single primary colours is worked, or the wave plate that the light of two kinds of colors is worked.
6. show ray machine according to claim 1,2,3 or 4 described reflection type liquid crystals, it is characterized in that: described wide wavestrip wave plate is that two wave plate stacks of only single primary colours being worked are formed.
7. show ray machines according to claim 1,2,3 or 4 described reflection type liquid crystals, it is characterized in that: double-colored in the double-colored spectro-film of described dichronic mirror plating is any two kinds of colors in the red, green, blue three primary colours.
8. show ray machines according to claim 1,2,3 or 4 described reflection type liquid crystals, it is characterized in that: the described polarizer is polaroid or grating with polarization spectro function.
9. show ray machines according to claim 1,2,3 or 4 described reflection type liquid crystals, it is characterized in that: described analyzer is polaroid or grating with polarization spectro function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310103051 CN1258691C (en) | 2003-10-31 | 2003-10-31 | Reflecting type device for displaying light by liquid crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310103051 CN1258691C (en) | 2003-10-31 | 2003-10-31 | Reflecting type device for displaying light by liquid crystal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1540392A true CN1540392A (en) | 2004-10-27 |
| CN1258691C CN1258691C (en) | 2006-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310103051 Expired - Fee Related CN1258691C (en) | 2003-10-31 | 2003-10-31 | Reflecting type device for displaying light by liquid crystal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1258691C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004388A (en) * | 2010-10-15 | 2011-04-06 | 天津峰景光电科技有限公司 | Three-dimensional miniature projector module |
| CN107861242A (en) * | 2017-12-20 | 2018-03-30 | 嘉兴中润光学科技有限公司 | Imaging system with multisensor |
| CN109283774A (en) * | 2018-11-09 | 2019-01-29 | 广景视睿科技（深圳）有限公司 | A kind of projection lens and optical projection system |
-
2003
- 2003-10-31 CN CN 200310103051 patent/CN1258691C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004388A (en) * | 2010-10-15 | 2011-04-06 | 天津峰景光电科技有限公司 | Three-dimensional miniature projector module |
| CN107861242A (en) * | 2017-12-20 | 2018-03-30 | 嘉兴中润光学科技有限公司 | Imaging system with multisensor |
| CN107861242B (en) * | 2017-12-20 | 2019-07-05 | 嘉兴中润光学科技有限公司 | Imaging system with multisensor |
| CN109283774A (en) * | 2018-11-09 | 2019-01-29 | 广景视睿科技（深圳）有限公司 | A kind of projection lens and optical projection system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1258691C (en) | 2006-06-07 |
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