CN1258690C - Reflection type liquid crystal display light machine - Google Patents
Reflection type liquid crystal display light machine Download PDFInfo
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- CN1258690C CN1258690C CN 200310103054 CN200310103054A CN1258690C CN 1258690 C CN1258690 C CN 1258690C CN 200310103054 CN200310103054 CN 200310103054 CN 200310103054 A CN200310103054 A CN 200310103054A CN 1258690 C CN1258690 C CN 1258690C
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- liquid crystal
- reflection type
- polarization spectroscope
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Abstract
The present invention relates to a reflecting type liquid crystal display light machine which belongs to the field of optical instruments. The purpose of the present invention is to overcome the defects of the prior art and provides a liquid crystal display projector which has the advantages of simple structure, low production cost and low technical requirement and can be favorable to scale production. The present invention discloses a reflecting type liquid crystal display light machine which comprises a light source component, a light splitting/ converging system and a projecting lens, wherein the light splitting/ converging system comprises a polarizer, two wide waveband wave plates, a polarizing spectroscope, a dichroic mirror, an analyser and three reflecting type liquid crystals; the three reflecting type liquid crystals can respectively modulate tricolored light of red light, green light and blue light; the polarizing spectroscope is a prism composed of two triangular prisms of which the public gluing surface is plated with a wide wavelength polarizing light splitting film; the dichroic mirror is a plane dichroic mirror which is plated with a bicolor light splitting film. The present invention has the advantages of few needed optical device and convenient debugging and positioning of the light splitting/ converging system, and low cost of the light machine and can be easily accepted by families.
Description
Technical field
The invention belongs to optical instrument field, relate in particular to a kind of projection device.
Background technology
The crystal projection technology has obtained great development, is widely used in computing machine and shows projector, projection TV.This technology has improved human lives's quality, has brought great riches to society.
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 (projector's illumination is provided), collimation lens set (diverging light of lighting source emission is become parallel beam), light filter (infrared and ultraviolet light in the elimination light beam), the polarizer (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 modulated by three reflection type liquid crystals (for example, present LCOS chip) respectively; Light engine is combined into three coloured light a branch of again, is mapped to and forms image on the projection lens.
The publication number of Chinese invention patent application " LCD projector " is CN1330280A, open day on January 9th, 2002.Disclose in the disclosure instructions and a kind ofly contained 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) the separation/combination photosystem of this LCD projector needs 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; (3) owing to adopted polarization splitting prism, there is the low problem of high angle scattered light extinction ratio, directly influences the contrast of ray machine.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of performance height, simple in structure is provided, production cost is low, the LCD projector that technical requirement is low, be beneficial to large-scale production.
The invention provides a kind of reflection type liquid crystal and show ray machine, comprise light source assembly, separation/combination photosystem and projection lens, it is characterized in that described separation/combination photosystem comprises the polarizer, two wide wavestrip wave plates, polarization spectroscope, dichronic mirror, analyzer, and three reflection type liquid crystals can distinguishing modulated red, green, blue three color light; Described polarization spectroscope is the grating that a slice has the polarization spectro function, or a prism of being made up of two triangular prisms, engraves the grating with polarization spectro function 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 polarized light that goes out to inject the separation/combination system from described light source assembly enters polarization spectroscope through the polarizer, the first wide wavestrip wave plate, incide on first reflection type liquid crystal from one road light beam of polarization spectroscope transmission, after described dichronic mirror beam split, incide on the reflection type liquid crystal from another road light beam of polarization spectro mirror reflection respectively; Return along original optical path through the folded light beam after three reflection type liquid crystal modulation, throw into described projection lens through described polarization spectroscope, the second wide wavestrip wave plate and analyzer.
Wide wavestrip wave plate of the present invention 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, or two wave plate stacks of only single primary colours being worked are formed.
Double-colored in the double-colored spectro-film of dichronic mirror of the present invention 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.
The required optical device of separation/combination photosystem of the present invention 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 the existing disclosed LCD projector of application for a patent for invention.
Fig. 2 is the structural representation of embodiments of the invention one.
Fig. 3 is the structural representation of embodiments of the invention two.
Fig. 4 is the structural representation of embodiments of the invention three.
Fig. 5 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:
Light source assembly of the present invention comprises lighting source, collimation lens set, and light filter rises/analyzer.
In Fig. 2, two embodiment of the present invention shown in Figure 3, polarization spectroscope 11 is prisms of being made up of two triangular prisms, on the public cemented surface of two triangular prisms, be coated with wide wavelength polarization beam splitter or engrave grating, the grating that the polarizer and analyzer adopt polaroid or have the polarization spectro function with polarization spectro function.
According to go out to inject the separation/combination system from light source assembly is S polarized light or P polarized light, describes in two kinds of situation:
(1) if is 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 purified through the polarizer 9 so, incide the first wide wavestrip wave plate 10 then, change the S polarized light of A color of light into the P polarized light, all the other two kinds of light still are the S polarized light.This three-beam incides polarization spectroscope (PBS) 11 then, and A color polarized light is through polarization spectroscope 11 direct transmissions, and B, C color polarized light are reflected through polarization spectroscope.After the S polarized light of B, two kinds of colors of C reflects 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 S) is polarized the spectroscope reflection so; B, C light (polarization state is P) through liquid crystal reflection arrives polarization spectroscope after dichronic mirror closes light, directly from the polarization spectroscope transmission, so just realized the light that closes of A, B, C three coloured light, 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 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 through behind the polarizer 9 so, incide the first wide wavestrip wave plate 10, change the P polarized light of A, two kinds of color of light of B into the S polarized light, C light still is the P polarized light.Then, this three-beam incides polarization spectroscope 11, and A, B color polarized light are reflected through polarization spectroscope, and C color polarized light is through the direct transmission of polarization spectroscope.After in like manner the S 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.The principle and (1) the kind situation of closing light are similar.
According to the position relation of dichronic mirror and polarization spectroscope and the type of polarization spectroscope, the present invention implements structures by can also be as shown in Figure 4 and Figure 52 kinds, polarization spectroscope 11 is the plane polarization spectroscope of plating polarization beam splitter in the transparent plate substrate or the grating that a slice has the polarization spectro function in these two embodiment, the grating that the polarizer and analyzer adopt polaroid or have the polarization spectro function.In embodiment illustrated in fig. 4, dichronic mirror and polarization spectroscope be arranged in parallel, be provided with vertical with polarization spectroscope of dichronic mirror in embodiment illustrated in fig. 5.The course of work of describing in the course of work of ray machine and the previous embodiment is identical.
Compare with adopting common polarization splitting prism, adopt the polarization spectroscope of plane grating to have 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 the wire grating polaroid (WGP) of U.S. MOXTEK company.
Claims (7)
1. reflection type liquid crystal shows ray machine, comprise light source assembly, separation/combination photosystem and projection lens, it is characterized in that: described separation/combination photosystem comprises the polarizer (9), two wide wavestrip wave plates (10,13), polarization spectroscope (11), dichronic mirror (12), analyzer (14), and three reflection type liquid crystals (5,6,7) that can distinguish modulated red, green, blue three color light; Described polarization spectroscope (11) is a prism of being made up of two triangular prisms, engraves the grating with polarization spectro function on the public cemented surface of two triangular prisms; Described dichronic mirror (12) is a planar dichroic mirror that is coated with double-colored spectro-film;
The polarized light that goes out to inject the separation/combination system from described light source assembly enters polarization spectroscope (11) through the polarizer (9), the first wide wavestrip wave plate (10), incide on first reflection type liquid crystal (7) from one road light beam of polarization spectroscope (11) transmission,, after described dichronic mirror (12) beam split, incide respectively on the reflection type liquid crystal (5,6) from another road light beam of polarization spectroscope (11) reflection; Return along original optical path through the folded light beam after three reflection type liquid crystal modulation, go into described projection lens through described polarization spectroscope (11), the second wide wavestrip wave plate (13) and analyzer (14) projection.
2. reflection type liquid crystal according to claim 1 shows ray machine, 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.
3. reflection type liquid crystal according to claim 1 shows ray machine, 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.
4. reflection type liquid crystal according to claim 1 shows ray machine, it is characterized in that: double-colored in the double-colored spectro-film of described dichronic mirror (12) plating is any two kinds of colors in the red, green, blue three primary colours.
5. reflection type liquid crystal according to claim 1 shows ray machine, it is characterized in that: the described polarizer is polaroid or grating with polarization spectro function.
6. reflection type liquid crystal according to claim 1 shows ray machine, it is characterized in that: described analyzer is polaroid or grating with polarization spectro function.
7. reflection type liquid crystal shows ray machine, comprise light source assembly, separation/combination photosystem and projection lens, it is characterized in that: described separation/combination photosystem comprises the polarizer (9), two wide wavestrip wave plates (10,13), polarization spectroscope (11), dichronic mirror (12), analyzer (14), and three reflection type liquid crystals (5,6,7) that can distinguish modulated red, green, blue three color light; Described polarization spectroscope (11) is the grating that a slice has the polarization spectro function; Described dichronic mirror (12) is a planar dichroic mirror that is coated with double-colored spectro-film;
The polarized light that goes out to inject the separation/combination system from described light source assembly enters polarization spectroscope (11) through the polarizer (9), the first wide wavestrip wave plate (10), incide on first reflection type liquid crystal (7) from one road light beam of polarization spectroscope (11) transmission,, after described dichronic mirror (12) beam split, incide respectively on the reflection type liquid crystal (5,6) from another road light beam of polarization spectroscope (11) reflection; Return along original optical path through the folded light beam after three reflection type liquid crystal modulation, go into described projection lens through described polarization spectroscope (11), the second wide wavestrip wave plate (13) and analyzer (14) projection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310103054 CN1258690C (en) | 2003-06-24 | 2003-10-31 | Reflection type liquid crystal display light machine |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03137757 CN1460875A (en) | 2003-06-24 | 2003-06-24 | Reflection LCD optical machine |
| CN03137757.2 | 2003-06-24 | ||
| CN 200310103054 CN1258690C (en) | 2003-06-24 | 2003-10-31 | Reflection type liquid crystal display light machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1514268A CN1514268A (en) | 2004-07-21 |
| CN1258690C true CN1258690C (en) | 2006-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310103054 Expired - Fee Related CN1258690C (en) | 2003-06-24 | 2003-10-31 | Reflection type liquid crystal display light machine |
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| CN (1) | CN1258690C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5164421B2 (en) * | 2007-04-24 | 2013-03-21 | キヤノン株式会社 | Color separation / synthesis optical system and image projection apparatus using the same |
| 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 |
| CN113238379B (en) * | 2021-05-19 | 2022-11-15 | 上海天马微电子有限公司 | Head-up display system, driving method of head-up display system and vehicle |
| CN116224597A (en) * | 2021-05-19 | 2023-06-06 | 上海天马微电子有限公司 | Head-up display system and vehicle |
| CN114236826A (en) * | 2021-11-30 | 2022-03-25 | 北京至格科技有限公司 | Augmented reality display device of leak protection light |
| TWI816358B (en) * | 2022-04-11 | 2023-09-21 | 大陸商廣州印芯半導體技術有限公司 | Polarization beam splitting module and four-beam polarization beam splitting system using the same |
| CN115996284B (en) * | 2023-03-23 | 2023-06-13 | 北京深光科技有限公司 | LCOS projection optical machine with high contrast and no thermal defocus |
-
2003
- 2003-10-31 CN CN 200310103054 patent/CN1258690C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1514268A (en) | 2004-07-21 |
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