CN101546103A - Projection optics engine for true three-dimensional solid-state volume type stereo display system - Google Patents
Projection optics engine for true three-dimensional solid-state volume type stereo display system Download PDFInfo
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Abstract
A projection optics engine for true three-dimensional solid-state volume type stereo display system is provided with a projection light source, a color wheel with two stages of red, green and blue disk separately, a squared rod, a relay system, a light modulator DMD, a projection lens and a folding light path in sequence on an optical path; the projection light source may be LED or ultra-high pressure Hg bulb (UHP or SHP); the luminous ray emitted by the projection light source forms red, green and blue homogeneous light after permeating the color wheel, each homogeneous light forms a luminous spot on the emergence end of the squared rod after dividing light evenly; the luminous spot is irradiated on the light modulator DMD through the relay system, and is then emitted by the projection lens, the emergence luminous ray of the projection lens is imaged on a liquid crystal light valve with a dispersion state in a display body through the folding light path. The invention not only ensures display performance, also reduces cost, system structural complexity as well as display system volume.
Description
Technical field
The present invention relates to a kind of light engine, specifically, is a kind of projecting optical engine that can be used for true three-dimensional solid-state volume type stereo display system.
Background technology
True three-dimensional solid-state volume type stereo display is that objective body information is projected to respectively on the display body of the corresponding degree of depth according to display message surface each point degree of depth difference by the high speed projecting optical engine, thereby finish the true three dimensions stereo display of this objective body, mainly form, as shown in Figure 1 by image processing module, projecting optical engine and display body.Wherein, display body is to constitute by multilayer high permeability liquid crystal light valve is stacked, and every light valve is by applying different voltage power supplies at scattering or transmissive state.Under radiation of visible light, the scattering states light valve is creamy white, and is comparatively desirable projection screen, and the transmission state light valve then is clear state.It is scattering states that the control display body has only a slice light valve at any time, and other light valve is a clear state.The image that image processing module will show projects on the liquid crystal light valve of display body different depth by degree of depth difference by the high speed projecting optical engine.True three-dimensional solid-state volume type stereo display need not to wear auxiliary viewing apparatus, and the display message amount is many, can many people's various visual angles watch simultaneously.Compare with true three-dimensional rotation volume type stereo display technique, have that no mechanical whirligig, volume are frivolous, vibration resistance, portable performance are good, can move or advantage such as field environment use.
Projecting optical engine can be divided into liquid crystal (LCD) type, liquid crystal on silicon (LCoS) type and digital micro-mirror device (Digital Micro-Mirror Device, DMD) type according to the type of the spatial light modulator that adopts.According to bibliographical information, the true three-dimensional solid-state volume type display that U.S. LightSpace company produces has adopted three DMD projecting optical engines, when adopting three DMD light engines, need extra the setting to close the look device, so that red, green, blue three road light are synthesized, the system architecture complexity, volume is big.Because the DMD technology is that TIX exclusively owns at present, DMD device price is higher, adopts three DMD can increase system cost greatly undoubtedly.This version complexity height, cost height.
In true three-dimensional solid-state volume type stereo display system, projected image need pass through 20 layers of liquid crystal light valve imaging.In order to guarantee enough brightness and avoid the flicker of image that the projecting optical engine that is used for true three-dimensional solid-state volume type stereo display system need have high brightness output and high refresh rate.The projecting optical engine of present existing employing monolithic DMD version all can not satisfy the requirement of true three-dimensional solid-state volume type stereo display at brightness and refresh rate, simultaneously, can't solve the enough big and enough little contradiction of volume of imaging area.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point, a kind of projecting optical engine that is used for true three-dimensional solid-state volume type stereo display system is provided, on the basis that guarantees display performance, reduces cost, reduce the complicacy of system architecture, dwindle the display system volume.
Technical solution problem of the present invention adopts following technical scheme:
The design feature that the present invention is used for the projecting optical engine of true three-dimensional solid-state volume type stereo display system is:
On its light path, set gradually projection light source, have each colour wheel of two sections of red, green, blue colour disk, square rod, relay system, photomodulator DMD, projection lens and folded optical path; Described projection light source can adopt LED, or ultra high pressure mercury bulb UHP or SHP; The light of described projection light source outgoing sees through colour wheel and forms red, green, blue monochromatic light, and each monochromatic light is through the even light of square rod, at the exit end formation hot spot of described square rod; Described hot spot is imaged on the photomodulator DMD by relay system, is penetrated by projection lens then, and the emergent ray of described projection lens is imaged on the liquid crystal light valve that is in scattering states in the display body through described folded optical path.
The design feature that the present invention is used for the projecting optical engine of true three-dimensional solid-state volume type stereo display system also is:
The structure of described projection light source is set to: the white LED light source that is arranged is arranged on the bottom of reflection cavity, at the front end of reflection cavity condenser lens is set, and described colour wheel is positioned on the focal position of condenser lens.
Adopt UHP or SHP light source in the described projection light source, the elliposoidal reverberation bowl is set, described UHP or SHP light source are positioned on first focus of ellipsoid reverberation bowl, and described colour wheel is positioned on ellipsoid reverberation bowl second focus.
Described colour wheel adopts RGBRGB6 section, 4 times of speed, and red, green, the blue colour field frequency that produces via the colour wheel color separation makes the refresh rate of image on display body be at least 24Hz.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention is by adopting high brightness light emitting diode LED, UHP light source or SHP light source, make projection light source have enough light intensity, can satisfy and still have enough brightness after display body that light forms by each optical element in the projecting optical engine and by the multilayer liquid crystal light valve enters human eye;
2, the present invention has only adopted monolithic photomodulator DMD, and monolithic DMD structure greatly reduces system cost and system complexity with respect to three DMD structures, has reduced the volume of system;
3, the present invention can guarantee that by adopting the high speed colour wheel imaging of image on the display body that the multilayer liquid crystal light valve is formed do not have the flicker of human eye perception.By adopting six sections, 4 times fast colour wheels of RGBRGB, when satisfying the high refresh rate of true three-dimensional solid-state volume type stereo display projecting optical engine, reduced system cost.
4, the present invention is when the folded optical path between projection lens and the display body can guarantee to reduce the volume of projecting optical engine, and the image on display body has enough areas.
Description of drawings
Fig. 1 is the true three-dimensional solid-state volume type stereo display system schematic diagram.
Fig. 2 is a light engine structural representation of the present invention.
Fig. 3 is a projection light source LED embodiment synoptic diagram of the present invention.
Fig. 4 is projection light source UHP of the present invention or SHP embodiment synoptic diagram.
Fig. 5 is a relay system embodiment synoptic diagram of the present invention.
Fig. 6 is a folded optical path embodiment synoptic diagram of the present invention.
Number in the figure: 1 projection light source, 11 white LED light sources, 12 reflection cavities, 13 condenser lenses, 14 are UHP or SHP light source, 15 elliposoidal reverberation bowls, 2 colour wheels, 3 square rods, 4 relay systems, 41 relay systems, first lens, 42 relay systems, second lens, 43 relay systems the 3rd catoptron, 44 relay systems the 4th lens, 5 photomodulators, 6 projection lens, 71 first catoptrons, 72 second catoptrons, 73 the 3rd catoptrons, 74 the 4th catoptrons, 8 display body.
Below by embodiment, the invention will be further described in conjunction with the accompanying drawings.
Embodiment
Shown in Figure 1, in true three-dimensional solid-state volume type stereo display system, display image is radiated on the display body by projecting optical engine through after the image processing module.Display body is made up of the multilayer liquid crystal light valve, and such as 20 layers, when liquid crystal light valve was in scattering state, the image of projecting optical engine outgoing can imaging on this layer liquid crystal light valve.
Fig. 2 is the projecting optical engine structural representation that is used for true three-dimensional solid-state volume type stereo display system of the present invention.Present embodiment sets gradually projection light source 1, has each colour wheel of two sections 2 of red, green, blue colour disk, square rod 3, relay system 4, photomodulator DMD5, projection lens 6 and folded optical path 7 on the light path of projecting optical engine.The light focusing that projection light source 1 is sent is on colour wheel 2 surfaces.When colour wheel 2 high speed rotating, the colour disk that light sees through colour wheel 2 surfaces produces red, green, blue streak line.Red, green, blue streak line by colour wheel 2 enter square rod 3 in proper order.Square rod 3 can be solid glass bar, also can be the double glazing rod of the reflecting glass composition of interior plating highly reflecting films.Light is repeatedly reflection in square rod 3, forms the uniform light spots of rectangle at square rod 3 other ends.Hot spot is radiated on the photomodulator DMD5 by relay system 4, is penetrated by projection lens 6 then, and the emergent ray of projection lens 6 is imaged on the liquid crystal light valve that is in scattering states in the display body 8 through folded optical path 7.
Because light need enter human eye by the multilayer liquid crystal light valve, the transmitance when liquid crystal light valve is in transmission state has determined the final brightness that human eye is experienced.Transmitance when the liquid crystal light valve transmission state is 75%, when display body is made up of 20 layers of liquid crystal light valve, the light that the transmission display body finally arrives human eye has only 0.317% of projecting optical engine emergent ray.In order to produce enough brightness, the light that projection light source is sent need have enough luminous fluxes.The brightness of display screen was at least 120cd/m when as a rule, human eye watched display screen to feel comfortable
2When screen size is 10 inches, it is 75% that liquid crystal light valve sees through the attitude transmitance, and the folded optical path reflectance of reflector is 90%, and light engine efficient is 20% o'clock, and the total light flux that projection light source is sent is at least 9200lm.
Projection light source can adopt LED or ultrahigh pressure mercury lamp UHP or SHP.
Employing LED shown in Figure 3 is as projection light source.The white LED light source 11 that is arranged is arranged on the bottom of reflection cavity 12, at the front end of reflection cavity 12 condenser lens 13 is set, and colour wheel 2 is positioned on the focal position of condenser lens 13.For satisfying the requirement of luminous flux,, need 100 (10 * 10) above large power white light LED if adopt the LED of 1001m/W.
UHP or the SHP of having adopted shown in Figure 4 is as projection light source.For satisfying the requirement of luminous flux, the power of UHP or SHP should be at least more than 200W.UHP or SHP light source 14 are positioned on first focus of ellipsoid reverberation bowl 15, and colour wheel 2 is positioned on ellipsoid reverberation bowl 15 second focuses.
For fear of flicker, the refresh rate of image should be 24Hz at least.Owing to adopt monolithic DMD structure, for the display body that 20 layers of liquid crystal light valve are formed, the frequency red, green, blue colour field that just needs colour wheel to produce is 24*20=480Hz.Still the projecting optical engine that does not have at present high refresh rate like this.When adopting the colour wheel of RGBRGB6 section, colour wheel rotates a circle and can produce two red, green, blue colour fields, so just can adopt the colour wheel of 240Hz.Therefore the present invention adopts the colour wheel of RGBRGB6 section, 4 times of speed to solve the refresh rate problem.
Because the restriction of optical system structure and square rod size, usually can't be directly the exit facet of square rod 3 be directly placed on the surface of DMD, thereby need introduce relay system 4 in the back of square rod 3, and the exit facet of square rod 3 is imaged on the DMD surface, form the illumination hot spot that brightness all has.Figure 5 shows that the version of relay system, comprise relay system first lens 41, relay system second lens 42, relay system the 3rd catoptron 43 and relay system the 4th lens 44.Wherein, the comprehensive magnification of relay system first lens 41, relay system second lens 42 and relay system the 4th lens 44 is the DMD size and the ratio of square rod size; Relay system the 3rd catoptron 43 can change radiation direction, reduces system bulk.
In order to guarantee that the imaging of image on display body has certain area, need to have certain light path between projection lens and the display body.If adopt the bigger projection lens of the angle of divergence, though just can realize certain display area at short light path, but because the display body 8 that the multilayer liquid crystal light valve is formed has certain thickness, this moment, the imaging area on ground floor liquid crystal light valve and last one deck liquid crystal light valve had bigger variation.Present embodiment is to have increased folded optical path 7 between projection lens 6 and display body 8, to guarantee having certain light path between projection lens and the display body.Folded optical path 7 is made up of the catoptron that multiaspect has high reflectance, front plated film.Quantity and the placement location of forming the catoptron of folded optical path should guarantee that projection lens meets design requirement to the light path of display body, and image can correct imaging on display body.
Shown in Figure 6 is an embodiment of folded optical path of the present invention, and the four sides catoptron is formed folded optical path.The light that projection lens 6 outgoing are set is projected on and is on oblique first catoptron 71 that is provided with of 60 degree angle lappings, and the reflection ray of first catoptron 71 is invested and is on horizontally disposed second catoptron 72; The reflection ray of second catoptron 72 is invested and is on horizontally disposed the 3rd catoptron 73, and the reflection ray of the 3rd catoptron 73 is invested and is on oblique the 4th catoptron 74 that is provided with of 60 degree angle lappings; The reflection ray of the 4th catoptron 74 is projected on the display body 8.
Change at 10% o'clock for 10 cun display areas, the 1st layer of liquid crystal light valve imaging area and the 20th layer of liquid crystal light valve imaging area, according to calculating, the light path between projection lens 6 and the display body 8 is 980mm.For loss, the anamorphose that guarantees projection light source brightness reduces to minimum, the reflectivity of the catoptron that folded optical path uses is 92%, and the minute surface flatness reaches ± 0.02mm.In order to eliminate ghost image, the catoptron front plated film in the folded optical path.The light path of chief ray from projection lens 6 process four sides catoptrons to display body 8 is 980mm.
The present invention can be used the display data-transmission mode of having announced in the Chinese patent 200710192048.7 that is used for true three-dimensional solid-state volume type stereo display system.
Claims (4)
1, be used for the projecting optical engine of true three-dimensional solid-state volume type stereo display system, it is characterized in that:
On its light path, set gradually projection light source (1), have each colour wheel of two sections (2) of red, green, blue colour disk, square rod (3), relay system (4), photomodulator DMD (5), projection lens (6) and folded optical path (7); Described projection light source (1) can adopt LED, or ultra high pressure mercury bulb UHP or SHP; The light of described projection light source (1) outgoing sees through colour wheel (2) and forms red, green, blue monochromatic light, and described each monochromatic light is through the even light of square rod (3), at the exit end formation hot spot of described square rod (3); Described hot spot is imaged on the photomodulator DMD (5) by relay system (4), is penetrated by projection lens (6) then, and the emergent ray of described projection lens (6) is imaged in the display body (8) through described folded optical path (7) and is on the liquid crystal light valve of scattering states.
2, the projecting optical engine that is used for true three-dimensional solid-state volume type stereo display system according to claim 1, the structure that it is characterized in that described projection light source (1) is set to: the white LED light source (11) that is arranged is arranged on the bottom of reflection cavity (12), front end at reflection cavity (12) is provided with condenser lens (13), and described colour wheel (2) is positioned on the focal position of condenser lens (13).
3, the projecting optical engine that is used for true three-dimensional solid-state volume type stereo display system according to claim 1, it is characterized in that adopting in the described projection light source (1) UHP or SHP light source (14), elliposoidal reverberation bowl (15) is set, described UHP or SHP light source (14) are positioned on first focus of ellipsoid reverberation bowl (15), and described colour wheel (2) is positioned on ellipsoid reverberation bowl (15) second focuses.
4, the projecting optical engine that is used for true three-dimensional solid-state volume type stereo display system according to claim 1, it is characterized in that described colour wheel (2) adopts 6 sections, 4 times speed of RGBRGB, red, green, the blue colour field frequency that produces via colour wheel (2) color separation makes the refresh rate of image on display body (8) be at least 24Hz.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103453448A (en) * | 2012-05-30 | 2013-12-18 | 日立视听媒体股份有限公司 | Light source device and image display apparatus |
| CN103700361A (en) * | 2013-12-13 | 2014-04-02 | 合肥工业大学 | Method for realizing gray scale of solid volumetric true three-dimensional (3D) display |
| CN104052980A (en) * | 2013-03-12 | 2014-09-17 | 耿征 | True three-dimensional image acquisition device, display system and display control method |
| CN104076584A (en) * | 2013-03-28 | 2014-10-01 | 台达电子工业股份有限公司 | Light source system applicable to digital film projecting device, and digital film projecting device |
| CN107894666A (en) * | 2017-10-27 | 2018-04-10 | 杭州光粒科技有限公司 | A kind of more depth stereo image display systems of wear-type and display methods |
| CN114721209A (en) * | 2022-04-27 | 2022-07-08 | 业成科技（成都）有限公司 | Projection display device |
-
2009
- 2009-05-05 CN CN200910116712A patent/CN101546103A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103453448A (en) * | 2012-05-30 | 2013-12-18 | 日立视听媒体股份有限公司 | Light source device and image display apparatus |
| CN104052980A (en) * | 2013-03-12 | 2014-09-17 | 耿征 | True three-dimensional image acquisition device, display system and display control method |
| CN104076584A (en) * | 2013-03-28 | 2014-10-01 | 台达电子工业股份有限公司 | Light source system applicable to digital film projecting device, and digital film projecting device |
| CN103700361A (en) * | 2013-12-13 | 2014-04-02 | 合肥工业大学 | Method for realizing gray scale of solid volumetric true three-dimensional (3D) display |
| CN103700361B (en) * | 2013-12-13 | 2015-11-25 | 合肥工业大学 | A kind of solid-state volume type real tri-dimension display gray scale implementation method |
| CN107894666A (en) * | 2017-10-27 | 2018-04-10 | 杭州光粒科技有限公司 | A kind of more depth stereo image display systems of wear-type and display methods |
| CN114721209A (en) * | 2022-04-27 | 2022-07-08 | 业成科技（成都）有限公司 | Projection display device |
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Open date: 20090930 |