CN102621703A

CN102621703A - High-efficiency polarized stereo display method

Info

Publication number: CN102621703A
Application number: CN2012101153005A
Authority: CN
Inventors: 黄凤仙
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-04-11
Filing date: 2012-04-11
Publication date: 2012-08-01

Abstract

The invention discloses a high-efficiency polarized stereo display method. Two groups of identical optical engines carry out reflective projection relative to a polarizing optical splitter; and light of the two groups of identical optical engines passes through a polarization converter, and is subjected to polarizing light-splitting, polarization conversion and modulation of light combination in sequence. The emergent light of the two groups of optical engines respectively has polarizing characteristics of polarized directions being mutually vertical or opposite, and the projected light can finally meet and overlap together on a projection screen. A signal of left eye pictures and a signal of right eye pictures are respectively input into the two groups of optical engines, so that the left eye and the right eye can see the respective picture after a user wears a pair of glasses with a corresponding polarization characteristic, and therefore, a stereo picture is synthesized in the brain.

Description

A kind of high efficiency polarisation stereo display method

Technical field

The invention relates to a kind of high efficiency polarisation stereo display method

Background technology

In recent years; The 3D display industry is along with the 3D film starts broadcasting and fast development, and the 3D display technique that is representative with passive type polarization light technology and active fast gate technique is just adopted by most 3D TVs or 3D projection, in over the last two years, popularizes rapidly; Part 3D shows that product has also dropped to and the approaching price range of 2D demonstration product; Gradually in business meetings, large-scale displaying, a lot of aspects such as home entertaining have occupied one seat.

But present main flow stereo display technique still has certain defective; Initiatively fast gate-type technology makes 3D brightness have only about 20% of 2D brightness; And in the passive polarization type technology; The shortcoming that the polarisation TV has resolution to reduce by half, and dual-projection system adjustment contraposition complicacy is difficult to use in the occasion beyond the engineering.Therefore, how can accomplish not reduce brightness of image or image quality when switching 3D, 2D pattern, remaining a big problem needs to solve, like this could the better deep development that advances the 3D industry.

Summary of the invention

The present invention provides a kind of high efficiency polarisation stereo display method; The throw light of two groups of identical optical parameters is about the projection of polarizing beam splitter mirror image; Behind the polarisation converter; Two groups of emergent lights have the orthogonal or opposite polarized light property in polarization direction respectively, and throw light overlaps finally on projection screen, joining.Let two groups of throw lights carry the signal of right and left eyes picture respectively, right and left eyes is seen image separately respectively after the glasses of wearing corresponding polarized light property so, thus in brain synthetic stereo image.

The present invention is a kind of high efficiency polarisation stereo display method; Utilize this method to make and do not possess the light that identical polarization direction does not perhaps have polarized light property; Such as common 3LCD, the projection ray of DLP light engine is when realizing polarisation stereo display; Almost do not have the luminance loss, can realize picture quality same when 2D shows.

The present invention is a kind of high efficiency polarisation stereo display method, is applicable to projection field.

Description of drawings

Fig. 1 is the structural representation of a kind of high efficiency line polarisation stereo display method of first embodiment provided by the invention.

Fig. 2 is the structural representation of a kind of high efficiency rotatory polarization stereo display method of second embodiment provided by the invention.

Embodiment

For the present invention is done explanation further, lift following preferred embodiment and conjunction with figs. and describe in detail as follows.See also Fig. 1, be the structural representation of a kind of high efficiency polarisation stereo display method of first embodiment provided by the invention.The

emergent light

1,2 of two groups of identical DLP light engines is miter angle about the projection of polarizing beam splitter 31 mirror images with polarizing beam splitter 31, and emergent light is a natural light, does not have polarization characteristic.Emergent light 1 incides polarization converter 3 to the right, and emergent light 2 upwards incides polarization converter 3.Polarization converter 3 is by polarizing beam splitter 31; Polarization conversion sheet 32; 33 3 parts of splicer are formed; Here polarizing beam splitter 31 is PBS Amici prisms; Polarization conversion sheet 32 is bright dipping side surfaces that wide territory 1/2 wave plate (wave plate optical axis direction and polarization of light direction are 45 degree angles) of a slice total visible light wavelength coverage is attached to Amici prism, and homonymy and polarization conversion sheet 32 are catoptron that about 45 degree have placed a fine-tuning angle as splicer 33, and the reflecting surface of splicer 33 is approaching parallel with the polarization light-dividing surface of polarizing beam splitter 31.Emergent light 1 upwards reflects away through a part of light behind the Amici prism; Reflected light 11 has the s light polarization, a part of in addition transmittance, and transmitted light has the p light polarization; Continue to convert the s light polarization to through polarization conversion sheet 32 back transmitted lights to the right; Upwards reflect away via catoptron at last, reflected light 12 thereby also have the s light polarization, the angle of catoptron can be finely tuned apart from the distance of projection screen according to polarization converter; The separated two-

beam

11,12 that makes a light engine come out can form images on screen and picture overlaps.Same, emergent light 2 through a part of light behind the Amici prisms transmission that makes progress go out, transmitted light 22 has the p light polarization; A part of in addition light reflection; Reflected light 21 has the s light polarization, continues to convert the p light polarization to through polarization conversion sheet 32 back reflection light to the right, upwards reflects away via catoptron at last; Reflected light 21 thereby also have the p light polarization; The angle of catoptron can be finely tuned apart from the distance of projection screen according to polarization converter, and purpose is that the separated two-

beam

21,22 that lets a light engine come out can form images on screen and the picture coincidence.In addition; Relative position that can be through adjusting two groups of light engines is so that make reflected light 11 and transmitted light 22 on screen, to overlap by basic picture; We just can think that 21,22 two-beams also can overlap by picture to splicer 33 on screen when regulating the coincidence of 11,12 two-beam pictures so.What replenish a bit here is that reflected

light

11,12 can realize that it is because optical path difference (equaling the size of polarizing beam splitter 31) is far smaller than projector distance that picture overlaps; And reflected light 11; 12 angle is generally less than 0.5 degree, thereby to focusing on, the influence of picture size can be ignored.Give the left eye picture signal that overturns about left side light engine 1 output one pair, and give 2 outputs of downside light engine one secondary normal right eye picture signal, also promptly two width of cloth picture signals also are mirror about polarizing beam splitter 31.So via the emergent light after the polarization converter with having following signal respectively: emergent light 22 is the p polarized lights that have normal right eye picture; Emergent light 21 also is the p polarized light that has normal right eye picture; Emergent light 11 is the s polarized lights that have normal left eye picture, and emergent light 12 also is the s polarized light that has normal left eye picture.That is to say that what on screen, appear is left eye picture that has a s polarized light characteristic and the right eye picture that has p polarized light characteristic.Put on after the corresponding polaroid glasses that left eye will only can be seen the left eye picture and right eye will only can be seen the right eye picture, thereby form stereo-picture at brain.This mode has also realized high efficiency polarisation stereo display for the light engine of nonpolarized light.Be to be understood that; Polarization conversion sheet 32 can also make up with polarization conversion sheet 321 and polarization conversion sheet 322; When

polarization conversion sheet

321 and 322 exit facet on two beam split light paths and all be the wide territory quarter wave plate of the total visible light wavelength coverage of same specification respectively; The optical axis angle of quarter wave plate and polarized light optical axis angle are 45 when spending; The projection ray of so same group light engine will have identical circularly polarized light optical characteristics, and two groups of projection rays are having left-handed respectively or the right-hand circular polarization characteristic, also all be construed as to belong to scope of the present invention.

See also Fig. 2, be the structural representation of a kind of high efficiency polarisation stereo display method of second embodiment provided by the invention.The

emergent light

1,2 of two groups of identical 3LCD light engines is miter angle about the projection of polarizing beam splitter 31 mirror images with polarizing beam splitter 31, and the emergent light of 3LCD normally ruddiness, blue light has the s polarization characteristic, and green glow has the p polarization characteristic.Emergent light 1 incides polarization converter 3 to the right, and emergent light 2 upwards incides polarization converter 3.Here polarizing beam splitter 31 is WGP wire grid polarizers, and splicer 33 is placed on wherein in the emitting light path and is parallel with the WGP wire grid polarizer, and splicer 33 is catoptrons of a fine-tuning angle here.Polarization conversion sheet 32,34th, the wide territory quarter wave plate of a pair of total visible light wavelength coverage places two emitting light paths respectively, and the wave plate optical axis direction all is 45 degree angles with the polarization direction of two bundle emergent lights respectively, and two optical axis directions are orthogonal.Emergent light 1 upwards reflects away through ruddiness behind the Amici prism and blue light, and reflected light 11 is the mixed lights that have redness with the blueness of s light polarization, and green glow has the p light polarization thereby transmission is gone out, and upwards reflects away via the catoptron of about miter angle.The angle of catoptron can be finely tuned apart from the distance of imaging screen according to polarization converter, and the separated two-

beam

11,12 that makes a light engine come out can form images on screen and picture overlaps.Same, emergent light 2 through the green glow that has the p light polarization behind the Amici prisms transmission that makes progress go out, the ruddiness with s light polarization and blue light then reflect away for twice via polarizing beam splitter 31 and splicer 33.Wherein, the emergent light 22 that has the emergent light 11 of s light polarization and have a p light polarization converts to respectively after through polarization conversion sheets 32 to have left-handed or the right-hand circular polarization characteristic; And the emergent light 12 that has the emergent light 21 of s light polarization and have a p light polarization converts to respectively after through polarization conversion sheets 32 and has dextrorotation or Left-hand circular polarization characteristic.That is to say that the light that comes out from a light engine 1 all has left-handed or the right-hand circular polarization characteristic; And all have dextrorotation or Left-hand circular polarization characteristic from the light that another light engine 2 comes out; The light that two

light engines

1,2 come out is always opposite through

polarization conversion sheet

32,34 rear polarizer directions.The angle of catoptron can be finely tuned apart from the distance of projection screen according to polarization converter, and the separated two-

beam

21,22 that makes a light engine come out can form images on screen and picture overlaps.Give the left eye picture signal that overturns about left side light engine 1 output one pair; And give 2 outputs of downside light engine one secondary normal right eye picture signal, what on screen, appear so is to have the left eye picture of left-handed or right-hand circular polarization characteristic and the right eye picture with dextrorotation or Left-hand circular polarization characteristic.Put on after the corresponding rotatory polarization glasses that left eye will only can be seen the left eye picture and right eye will only can be seen the right eye picture, thereby form stereo-picture at brain.Should be appreciated that polarization conversion sheet 34 can also replace with polarization conversion sheet 341, all be the quarter wave plate of same specification, but the position is different, can both realize high efficiency polarisation stereo display, all is construed as to belong to scope of the present invention.Be appreciated that two groups of pure polarized lights can more simply realize polarisation stereo display, implementation can be regarded as the special case situation of polarization converter.

In addition, I also can do other variation in spirit of the present invention, as long as it does not depart from technique effect of the present invention, all should be included within the present invention's scope required for protection.

Claims

1. high efficiency polarisation stereo display method; It is characterized in that: the throw light of two groups of identical optical parameters through the polarisation converter, carries out polarization spectro about the projection of polarizing beam splitter mirror image successively; Polarization conversion; Close light, make two groups of emergent lights have the orthogonal or opposite polarized light property in polarization direction respectively, and throw light will be finally overlaps guaranteeing to join on the constant projection screen of polarizability.Let two groups of throw lights carry the signal of right and left eyes picture respectively, right and left eyes is seen image separately respectively after the glasses of wearing corresponding polarized light property so, thus in brain synthetic stereo image.

2. stereo display method as claimed in claim 1 is characterized in that: two groups of throw lights with identical optical parameter are about the projection of polarizing beam splitter mirror image.

3. polarizing beam splitter as claimed in claim 2 is characterized in that: every group of incident ray is divided into the mutually perpendicular two-beam of polarization characteristic respectively, s line polarisation reflection usually, p line polarizing transmission.Polarizing beam splitter can be inorganic reflection-type Polarizer, also can be the PBS Amici prism, can also be that other can be divided into two bundle polarized lights with light and reflect the optical device with transmission respectively.

4. stereo display method as claimed in claim 1; It is characterized in that: wherein a branch of conversion through a polarization converter device of the two bundle polarization lights that separate after the polarization spectro makes same group of throw light after the polarization converter outgoing, all have identical polarization characteristic.The two bundle polarization lights that perhaps separate after the polarization spectro all pass through the conversion of one or two polarization converter device respectively, make same group of throw light after the polarization converter outgoing, all have identical polarization characteristic.Polarization converter can be 1/2 wave plate of wide visible wavelength range, also can be the quarter wave plate of wide visible wavelength range, can also be 1/2 wave plate of wide visible wavelength range and the combination of quarter wave plate.

5. stereo display method as claimed in claim 1 is characterized in that: wherein a branch of process splicer of the two bundle polarization lights that separate after the polarization spectro, it is overlapping to make same group of throw light on projection screen, to join.The two bundle polarization lights that perhaps separate after the polarization spectro all pass through one or two splicer respectively, and it is overlapping to make same group of throw light on projection screen, to join.Splicer can be a catoptron, also can be total reflection prism.

6. splicer as claimed in claim 5; It is characterized in that: the reflecting surface of splicer is approaching parallel with the parting plane of polarizing beam splitter; Splicer can be movable; The angle of the reflecting surface through changing splicer and the parting plane of polarizing beam splitter, overlapping to guarantee on the projection screen of different projector distances, to join again after the same group of throw light beam split.

7. stereo display method as claimed in claim 1 is characterized in that: the right and left eyes picture signal that two groups of throw lights with identical optical parameter carry also is to be mirror about polarizing beam splitter.