CN1882867A - Solid state light engine optical system - Google Patents

Abstract

An optical system for use in projection based displays includes a plurality of solid state light sources associated with a plurality of total internal reflection based compound hyperbolic emitters (CHE), a graduated dichroic filter based device for homogenizing light output from the plurality of solid state light sources, a ferroelectric liquid crystal on silicon device for illumination with light output from the array of light sources, and a polarization diffuser for homogenization of light at the ferroelectric liquid crystal on silicon device. The polarization diffuser is positioned at a point in space, in the optical system, where the size of a beam of light transmitted from the graduated dichroic filter device is at a maximum.

Description

Solid state light engine optical system

The cross reference of related application

The application's content is relevant with the U.S. Provisional Application No.60/465732 that is entitled as " personal cinema optical system (Personal TheaterOptical system) " (submission on April 24th, 2003), and the full content of introducing this application here as a reference.

Technical field

The present invention relates to light and video projector, relate in particular to the light fixture that is used for Projection Display.

Technical background

Current techniques discloses various light sources and the video projector that is used to watch video and image.The simplest optical projection machine comprises flashlamp, and more complex apparatus comprises the video projector with incandescent source, described in U.S. Patent No. 6227669.

Yet the shortcoming of projector is in the current techniques: they may be very heavy, complicated or fuzzy; May comprise the mass expensive parts; Volume is excessive; Produce too much heat; Need cooling fan; Produce too much noise; Or bulb life is short.So expectation can overcome the projection display of one or more above-mentioned shortcomings.

Summary of the invention

The present invention includes a kind of solid state light engine that constitutes by illumination subsystems and projection subsystem.

In an exemplary realization, the illumination subsystems utilization is from the single liquid crystal on silicon of rayed (LCOS) miniscope of red, green and blue light emitting diode (LED) output.The example of the operable miniscope of the present invention also comprises DLP, the MEMS etc. of FLCOS, HTPS, Texas Instrument (TexasInstruments).Projection subsystem is imaged on the LCOS miniscope on the reflection display screen or transmissive display of front projection formula TV or back projection type TV (RPTV).Produce gray scale and color by of short duration shake (dithering) LCOS miniscope and LED.Also can use other miniscope to produce gray scale with the similar fashion among the typical LCD.Thereby utilize this system can obtain at least 24-bit color, at least 1280 * 1024 resolution and the SXGA resolution of 60Hz frame frequency at least easily.Though this instructions illustrated based on the TV of projection, the present invention also can be used for computer monitor and other display device.

Comprise two telecentric light systems in the exemplary realization, it is at the maximum beam spread place diffused light from the light cone shape of light source object point, thereby the best local uniformization of each light source is provided at the image place.This telecentric light system can comprise the planar array of heart light emitting diode far away (LED) light source, and this light source is imaged onto on the miniscope by at least one Fresnel lens heart far away.Light from each color LED channel can be combined by dichroic cube structure, is imaged onto on the display simultaneously.Diffusion mechanism is placed just before last Fresnel lens, and maximum and these lens of beam spread herein are as the final stage image-forming block of this illuminator.

In addition, be known as non-imaging concentrator such as four-tuple reflection (quad reflective) concentrator, the differential concentrator of inner full-reflection (TIR) or boundary rays (edge ray) thus the such light concentrator of concentrator is used conversely and is called as transmitter, can in illuminator, use these light concentrators to collect the light of launching then from the large tracts of land solid state light emitter.This quad differential concentrator or boundary rays concentrator can comprise the concentrator of four integrated side by side independent combinations, and the concentrator of each independent combination is positioned at the center of a quadrant of this solid state light emitter and covers this quadrant.Periphery shape near solid state light emitter one end can also be described to " bunge bedstraw herb (clover) " structure.Compare with the single concentrator that covers whole solid state light emitter, this structure obtains the high-level efficiency collection of reduced size and the optics of emission.

In an exemplary realization, use four-tuple TIR compound hyperbolic transmitter (CHE, compound hyperbolic emitter) collect and emission from the light of large scale LED crystal grain, and this four-tuple TIR compound hyperbolic transmitter is combined side by side by four independent TIR compound hyperbolic transmitters and forms to cover this big LED crystal grain.Each CHE is positioned at quadrant central authorities of this LED crystal grain and covers this quadrant, obtains short and much smaller high efficiency collection and the transmitting optics parts than single concentrator.

Be positioned at by the angle with each crystal grain and form as have lap between among four CHE of four-tuple TIRCHE of clover configuration each, the output of non-circular crystal grain or crystal grain group can gather and send by more uniform quilt.

To partly enumerate other feature and advantage of the present invention in description hereinafter and the accompanying drawing, wherein, describe and show the preferred embodiments of the present invention, and to a certain extent, according to examination to following detailed description and accompanying drawing, these preferred embodiments are significantly to those skilled in the art, or can learn these preferred embodiments by practice of the present invention.The means and the combination that particularly point out by claims can realize and obtain advantage of the present invention.

Description of drawings

Fig. 1 shows the system layout of optical system according to an illustrative embodiment of the invention;

Fig. 2 shows the principle of the optical system telecentricity of using in an illustrative embodiment of the invention;

The optical system that Fig. 3 shows Fig. 1 is utilized the propagation path of light of double focusing heart principle far away;

Fig. 4 A and 4B show the red compound hyperbolic transmitter (CHE, Compound Hyperbolic Emitter) that uses in exemplary realization of the present invention;

Fig. 4 C shows the layout of the end face of compound hyperbolic transmitter, and this end face is used to assemble LED crystal grain, makes collection and emission efficiency the highest;

Fig. 4 D shows the layout of the end face of single four-tuple hyperbolic curve transmitter, and this end face is used to assemble LED crystal grain, makes collection and emission efficiency the highest;

Fig. 5 A and 5B show the green four-tuple compound hyperbolic transmitter (CHE) that uses in exemplary realization of the present invention;

Fig. 5 C shows the layout of the end face of four-tuple compound hyperbolic transmitter, and this end face is used to assemble a plurality of LED crystal grain, makes collection and emission efficiency the highest;

Fig. 5 D shows the location of a plurality of LED crystal grain in the end of the four-tuple compound hyperbolic transmitter shown in Fig. 5 C;

Fig. 6 shows the dichroic structure of using in the exemplary realization of the present invention, and this structure comprises the thin glass plate with dichroic material;

Fig. 7 shows the system configuration of the optical system of another exemplary realization according to the present invention;

Fig. 8 is the exemplary realization that is used to control the electronic circuit of LED light output;

Fig. 9 is the exemplary configurations of rear projection television.

Should be appreciated that, simple and clear for what illustrate, there is no need according to the true ratio parts shown in the figure that draw.For example for clear, the size of some parts is relative to one another by exaggerative.In addition, in these figure suitably repeat reference numerals represent corresponding components.

Embodiment

To be described in detail, yet should be appreciated that, embodiment disclosed herein only is an example of the present invention, and they can be implemented with various forms.Therefore, concrete structure disclosed herein and function detail should not be understood that to limit the present invention, but only as the basis of claim, and the representative basis that applies the present invention to any suitable concrete structure as professor those skilled in the art in every way.

Disclosure shown in (Fig. 1-8) now in detail with reference to the accompanying drawings.

As shown in Figure 1, the solid-state projector formed by illumination subsystems 32 and projection subsystem 30 of optical system 10.The light of a plurality of red 12, green 14 and blue 16 light emitting diodes (LED) that illumination subsystems 32 is used to be provided with in the self-separation color-set shines at least one miniscope 36.Projection subsystem 30 is imaged on the output of LCOS miniscope 36 on the reflection display screen or transmissive display of front projection formula TV or back projection type TV (RPTV).Produce gray scale and color by of short duration shake LCOS miniscope 36 and LED.Thereby utilize this system can obtain at least 24-bit color, at least 1280 * 1024 resolution and the SXGA resolution of 60Hz frame frequency at least easily.For the explanation of TV without limits, the display that does not have ability receiving television broadcasting, CATV (cable television) or other TV signal also within the scope of the present disclosure.In addition, those skilled in the art will find to use Organic Light Emitting Diode (OLED), solid-state laser, laser instrument and other narrow-band light source to replace one or more LED.In addition, LED can be any color, maybe can produce the light of any wavelength and/or wavelength band.

Illumination subsystems 32 is critical (critical) illuminator or A Beishi (Abbe) illuminator, and it is imaged on red, green and blue (RGB) led light source 12,14 and 16 respectively on space light valve, modulator or the Digital Light Processor of LCOS miniscope 36 or potential any other universal class.Use owing to the Ernst Carl Abbe in the microscopy, in the critical illumination system light source by direct imaging on thing.Designed illuminator 32 can also be the dual heart far away except being the critical illumination system.The dual heart far away is an important feature, is particularly useful for optimizing in the core structure far away that adapts to LED LCOS miniscope 36 or other optical processing based on the miniscope of angle.

With reference now to Fig. 2, describe, telecentric optical system is put, and at a focus place of this optical system aperture diaphragm 60 is set, and makes entrance pupil or emergent pupil be positioned at unlimited distance.Aperture diaphragm 60 is physical optical stop, is used for the quantity of light of this optical system of restricted passage and the bevel angle (cone) of light.Entrance pupil is the picture of this aperture diaphragm of forming of all the active optics elements by aperture diaphragm 60 fronts.Emergent pupil is the picture of this aperture diaphragm of forming of all the active optics elements by the aperture diaphragm back.

Optical system with object space telecentricity heart has the aperture diaphragm 60 of the back focus that is positioned at this optical system or lens 62.Thereby entrance pupil is arranged in object space 64 (so because object is usually located at this space and is called object space) unlimited distance.An incident chief ray 66 that is parallel to the optical axis propagation from object point 68 will pass the center arrival of aperture diaphragm 60 as plane 65.By definition, the light that this chief ray 66 comes since object point 68 is propagated the center of passing aperture diaphragm 60, therefore also passes the center of entrance pupil and emergent pupil, because they are pictures of aperture diaphragm.Chief ray 66 from another object point 70 is propagated in similar basically mode.For the object space telecentricity heart, if object point is moved, then the magnification of the picture point that is produced is constant, and just these points thicken in as the plane.

Similarly, has the aperture diaphragm 80 that the optical system of the image space heart far away has the front focus that is positioned at this optical system or lens 82.Thereby emergent pupil is arranged in the unlimited distance in space, common picture place.An incident chief ray 86 of propagating from object point 88 will pass the center of aperture diaphragm 80, and be parallel to the optical axis outgoing at picture 85 places, plane.A chief ray from another object point is propagated in similar basically mode.For the image space heart far away, if be moved as the plane, then the magnification of the picture point that is produced is constant, and just these points thicken in as the plane.At last, as shown in Figure 2, two telecentric systems 90 combine the advantage of the object space telecentricity heart and the image space heart far away.

On the one hand, miniscope 36 uses the ferroelectric liquid crystals technology to come the polarization state of incident light 37 in the plane of switch unit.Yet the effect that polarization delay of miniscope (polarizationretardation) and correlation behavior are switched is the function of optical path length in the ferroelectric material.That is, when the light normal incidence on its active plane and all light when in ferroelectric material, propagating with optical path length much at one, miniscope 36 is operated best.This all is correct based on the miniscope of liquid crystal for all.For example, though miniscope 36 (as the LOCS miniscope) can be accepted the axle stray light (f/1.2) up to 25 degree, it operates and produces best contrast best under the situation of f/3 or about 10 degree maximum incident angles.The light gathering of an optical system of f/n (f/number) expression.More light is assembled by the less optical system system bigger than f/n of f/n.The f/n of image space is defined as the effective focal length of optical system and the ratio of entrance pupil diameter.Yet, in typical illuminator, make f-n (f-number) thus approach the light quantity maximum that f/1 is used in irradiating object, this situation is unrare.In non-telecentric system, the chief ray at light source edge enters miniscope 36 with wide-angle, and be switched from the significantly different mode of the axle glazed thread of this light source center.Thereby to send to LCOS miniscope 36 or any similar miniscope 36 be favourable to approach normal incidence from the have a few of light source with light.Illumination subsystems 32 provides the image space heart far away at miniscope 36 places of LCOS miniscope 36 or any similar type, and feasible chief ray from each LED (12,14,16) shines miniscope 36 perpendicular to its plane.Chief ray in this case is that they pass the center of aperture diaphragm from the light of the object point of each end in these light sources.

Therefore, light enters the aperture of miniscope 36 more equably, and makes that to output to the distribution of light of projection screen from miniscope more even.Yet, though when passing this micro-display material, the light beam of chief ray can experience long slightly path, under similar f-n, from most of light ratios of specific light source point wide top condition that approaches greatly from non-telecentric system.

Typically, LED (12,14,16) is arranged on the circuit board, and their emission shaft is vertical with this circuit board.This transmitting illuminant is considered to a kind of telecentric lights, thereby suggestion uses telecentric optical system to carry out imaging.In this case, this optical system has the object space telecentricity heart.Therefore, provide the illumination subsystems of the object space telecentricity heart to make chief ray be parallel to the optical axis emission of this LED at the LED place from each LED.That is, making the light that is parallel to the optical axis emission from the LED center is chief ray.

From the angle of example, the present invention has used thing and the image space heart far away, with the needs of miniscope on the adaptive circuit plate and LED layout own.Fig. 3 shows two far away hearts operations of projector and from the travel path of the light of LED (12 ', 14,16 ') emission.This illuminator can comprise glass, plastics, aspheric surface or Fresnel (Fresnel) collector lens (20,26,28), with source imaging on miniscope 36.As example, current system uses three Fresnel lens (20,26,28), regulates the aberration of its Fresnel side with minimum illumination system.Except that the Fresnel lens or replace the Fresnel lens, also can use the normal glass lens.Yet the Fresnel lens of making larger aperture and low f/n are easier than making glass lens of equal value.In addition, make Fresnel lens aspherisation easily, with correcting spherical aberration, and the Fresnel lens are very thin very light, and are more cheap than glass condenser.

This illumination subsystems 32 comprises solid-state red, green and blue LED (12,14,16) light source.In one implementation, use the array of every kind of color among the red, green and blue LED as light source.On circuit board, these LED are arranged in array.During hereinafter another that describe in detail realized, for example, the LED of employed every kind of color was arranged in hexagonal combination array (packedarray).These arrays are made up of red, green and blue LED.Alternatively, can use any LED with selected wave band and output power.Can in the hemispherical dome of collecting optics (collectionoptic), encapsulate red LED crystal grain with the appropriate seal material.Also can in similar hemispherical dome, encapsulate green and blue LED crystal grain with the appropriate seal material.Green and blue LED can be four crystal grain that are arranged in the 2*2 crystal grain matrix.The crystal grain of these LED also can be encapsulated in the interior suitable closed material of similar dome-like cavity.This encapsulants must and be collected refractive index match (index matching) material that is provided for inner full-reflection between the optics at the crystal grain emitting surface.

All LED launch with semisphere Lambertian (lambert) emission mode in the array.The Lambertian emission mode shows the cosine decay of intensity simultaneously with the emission of the iso brightness on all directions around this hemisphere, the function of angle between this cosine decay conduct and this emitting surface normal.

Yet the basic problem of using this LED is to catch available light from this LED, and this available light is concentrated on and can be imaged on efficiently and physically in the zone and emission angle on the miniscope 36 by this critical illumination system.These hemispherical dome lens are in fact very big, limited the collection from the light of LED (12,14,16), and finally limited these light concentrating on miniscope 36.About the thermodynamic limitation on the light concentration theory, be called brightness conservation, handling capacity (throughput) or light exhibition amount (etendue), be the product between light emitted area and its emission solid angle, and as the only conservation of propagating by this optical system.For example, the small size light source with big emission solid angle is become and have the little emission solid angle of same transmit area.

Therefore, can use compound hyperbolic concentrators (CHC, compound hyperbolicconcentrator) to optimize from the collection efficiency that can be the light that sends of the LED of plane form.Compound hyperbolic concentrators and more generally related device compound parabolic concentrators (CPC, compound parabolic concentrator) be to be developed at first as the solar concentrator technology that is used for sun power is focused on detecting device.When using (promptly replacing this detecting device with LED) conversely, they become high efficiency luminaire or transmitter.Same, below they are called compound hyperbolic transmitter (CHE).In one implementation, these CHE are designed to obtain best inner full-reflection (TIR), thereby thereby make from the maximum crystal grain of combination and the emission efficiency maximum of CHE system of also making of the light collection efficiency of LED crystal grain.The actual LED crystal grain of these CHE assemblings, but from original LED encapsulation, remove hemispherical lens.The surface of this CHE itself is designed to come reflective by inner full-reflection.Utilize the sealant of refractive index match to fill the cavity of CHE bottom, the sealing agent is directly coupled to CHE with light from crystal grain.

In one implementation, red, green and blue CHE is different with green and blue CHE.This is because the size difference of crystal grain causes.In addition, number of C HE is intercepted certain-length limiting their output aperture, thereby allows to amplify their output to miniscope.The size of the output aperture of non-intercepting is directly related with the input aperture size according to following equation.

This intercepting only is limited in theoretical emission efficiency about 90%.Rule of thumb verified this numeral.As can be seen from Figure 4, the shape of these CHE is symmetrical.

Shown in Fig. 5 A-5D, four-tuple CHE has the left-right symmetric structure." four-tuple " CHE that this CHE normally is made up of four independent CHE.In addition, some green and aquamaine grains are red crystal grain twice sizes, and are in fact made by four independent crystal grain.

Four independent crystal grain than large matrix on arrange that single CHE produces excessive CHE Output Size, finally this size with will be inconsistent from the photoimaging of CHE needed size to the miniscope 36.This four-tuple CHE can reduce the Output Size of CHE, keeps suitable emission efficiency simultaneously.In addition, this four-tuple CHE is made of four independent CHE, and each CHE is the center with the angle " CC " of each among four crystal grain 119a-119d LED, to cover all LED fully.At last, (trim) repaired mutually along the plane that with this four-tuple CHE is the center in the surface of adjacent C HE.These equipment also must be intercepted, and this intercepting and this finishing be restricted to 65% with theoretical emission efficiency, and rule of thumb having verified should numeral.

From Fig. 5 A-5D as can be seen, in an exemplary realization, the end 110 of this four-tuple CHE comprises the circular overlapped surfaces end of being made up of each independent CHE (CHE1, CHE2, CHE3 and CHE4) end 116a-116d 116.This method guarantees to utilize four to take advantage of four arrays to cover crystal grain 119a-119d fully.Certainly, this design is suitable for covering the solid state light emitter of any amount Any shape, output power and wavelength.According to this aspect of the invention, can be Any shape (for example square, triangle etc.) and virtually any size in the overlapped surfaces (or aperture) of 110 ends, to guarantee to cover fully the crystal grain of Any shape with LED.

Therefore, the single CHE that may have a clover configuration (or triangle, square, circle or any polygon) shown in Fig. 5 C and 5D can determine the position with intergranule in some way, thereby make the collection efficiency maximum of this CHE, thereby and make the crystal grain of combination and the emission efficiency maximum of CHE system.Particularly, shown in Fig. 4 C, 520 ends of this CHE can be positioned on the crystal grain, to comprise this LED crystal grain 12 fully.Fig. 4 D shows 522 ends of the single CHE with four-tuple or clover configuration.The angle of this crystal grain 12 " CC " is positioned substantially at the center of each leaf lobe 522a-522d.

According to another aspect of the present invention, the end surfaces structure that a plurality of CHE combinations obtain any structure can be replaced this clover configuration (for example pentagon, hexagon etc.), and the edge of the rear end surface of these CHE can be positioned near the angle/limit of this crystal grain, so that the collection efficiency maximum of this CHE, and then make the crystal grain of this combination and the emission efficiency maximum of CHE system.An example of this clover configuration that is formed by four-tuple CHE has been shown among Fig. 5 C, has wherein comprised the crystal grain that for example comprises blue and green LED.

In native system 10, before being handled, must be reconfigured by miniscope 36 from the light of red, green and blue (RGB) LED (12,14,16).Can show at three dichroic liquid crystals uses color cube (color cube) and dichroic filter to carry out the color reorganization and separate in (LCD) optical projection system.

Color cube is sometimes referred to as " X-cube ", is actually the dichro iotac beam of being made up of four glass prisms, and these four glass prisms scribble special coating along prism side, but need not scribble this coating along the hypotenuse of prism.When these prisms by sticking and together the time, their side forms cubical cated diagonal plane, therefore is called as the X-cube.Very thereby approaching LCD need have high optical quality to the cubical position of X-usually.Yet the major defect of color cube comprises cost, size and weight.

Dichroic filter is generally used for the light from the such polychrome of typical discharge lamp (white) light source is divided into red, green and blue (RGB) color component, and dichroic filter typically is positioned at the light source side of illuminator.Separate colors after the processing is reconfigured by color cube.Yet the major defect of dichroic filter is to compare them to have relatively poor optical quality with color cube, and they separate two kinds of colors rather than three kinds simultaneously.

According to an exemplary aspect of the present invention, shown in Fig. 1,3 or dichroic X (DX) structure that describes in detail among Fig. 6 be designed to before the output of the light of RGB LED is handled by miniscope 36, it be reconfigured.By being cut to two halves, red dichroic filter 19 or blue dichroic filter 18 or gradient dichroic filters constitute DX structure 21.Can use gradient dichroic filters to replace even dichroic filter, the not desired color skew that causes by variation with compensation as the reflection of the function of the incident angle of input beam on dichroic filter and transmission.Then each end of half is fastened on the centre of another light filter, forms another " X " by thin glass plate dichroic filter.These dichroic filters do not need to have high optical quality, because they are positioned at the illumination end of native system 10, rather than are arranged in the imaging path.Dim (obscuration) that is produced by the junction between these half light filters is very little, and not in the conjugate plane of miniscope 36.Like this and the homogenising parts in this optical system alleviated by seam 23 produce inhomogeneous.

Comprise refrative mirror (fold mirror) 22 among the embodiment of this illuminator, be used for the folded optical path to realize very compact system.Can use aluminium paint to improve the front surface of this refrative mirror 22, make the reflection loss minimum.

Diffusing globe 34 is positioned at before the 3rd the Fresnel collector lens just.This diffusing globe homogenising or make from the inhomogeneous change of RGB led light source evenly.For example, the specific diffusing globe that uses in this design is polishing shape diffusing globe (LSD, Light Shaping Diffuser).Also can use the diffusing globe of plastics or ground glass, select diffusing globe according to use and other parameter of system.

The position optimization of this diffusing globe in this optical system arrive the homogenising of the light of miniscope 36.For example, diffusing globe is arranged near the source ends the CHE at conjugate position place of this critical illumination system, can obtain best light uniformization output.Reach the maximum immediate position of terminal optics with beam sizes (or beam spread), the homogenising of the best in this particular design is provided in the object space side of these parts.In this optical system, the diffused light from each LED that reaches its largest extension provides from the best local uniformization of the light of LED output at miniscope 36.

In another is realized, can remove this refrative mirror as shown in Figure 7, to make the optical loss minimum by the position relation that suitably is provided with between CHE-LED combination, DX structure 21, Fresnel lens 26,28 and diffusing globe 34 and polarization beam apparatus 24 and the miniscope 36.

Only unpolarized or natural polarization from the RGB led light source.Yet the light that incides on the LCOS miniscope must be by linear polarization.In addition, miniscope can be reflecting device but not emissive devices.Thereby polarization member 24 is used for: (i) linear polarization enters the light of miniscope and (ii) will reflex to projecting lens from the orthogonal polarization components of miniscope.Perhaps, this system can be designed to polarized light-emitting by LED.In this case, can replace polarization beam apparatus with common beam splitter.

In one implementation, polarization beam apparatus 24 can be wiregrating (for example, polarization beam apparatus 24 can be the beam splitter of being made by Moxtek company).Polarization beam apparatus 24 is simultaneously as polarizer and beam splitter.The wire grid polarizer characteristics be approach, light, relatively cheap, and significant extra thickness of glass can not introduced in illumination or the projection optics path.In addition, compare with typical polarization beam apparatus, wire-grid polarizer is accepted less f/n light beam (than the acceptance angle of big or broad) usually, has High Extinction Ratio, and the higher projection and the reflection of linearly polarized photon.

In another is realized, can use the polarizer of other type, as being the cube splitter with polarizing coating of very fast optical system optimization.Perhaps, can also use the polarizer of wiregrating or other type that the light that incides on the polarization beam apparatus is carried out prepolarization.

On the one hand, miniscope 36 can be a SXGA colour reflective formula LCD (LCD), can show to have the very full color computer or the video image of high spatial resolution.Liquid crystal on silicon (LCOS) equipment uses and switches the state of incident polarization apace with the relative ferroelectric structure of twisted nematic structure (tiwsted neumatic).Obtain gray scale and color by of short duration shake LCOS miniscope and LED.Can use the miniscope of other type among the current embodiment.For example, at least one miniscope, can use such monolithic technology such as the DLP of Texas Instrument.Perhaps, miniscope also can be LCOS, FLCOS, HTPS or based on MEMS.

Light trap 32 is a kind of sunken light box bodies, is designed to suppress from the non-flashlight of cross polarization of polarization beam apparatus 24 reflections.If do not suppress these light, if then they are reflected or are scattered back the remarkable decline that will promote contrast in the signal beams path 39.

Light trap 32 is made of welding glass that scribbles anti-reflecting layer (AR) and the black wall of high-absorbable.The welding glass that scribbles AR is orientated with incident light and becomes 45 to spend.Great majority are institute's visible light emitted only, and it enters the welding glass that scribbles AR, and when in this absorbing material, propagating by high absorption.Remaining sub-fraction reflect visible light is propagated to high-absorbable black wall.Any back scattered light is dispersed on this welding glass that scribbles AR, and the major part in this fraction light is further absorbed by this heat absorbing glass.The cavity of this light trap is designed to hinder the direct-path that stray light returns miniscope and imaging path with relevant aperture.Utilize this that reducing of amplitude in the stray light of can obtaining repeatedly is set.Can increase extra folding, further suppress any back scattered component.

Projecting lens 30 is imaged on the output of miniscope on the display screen.According to an aspect in the realization, projecting lens 30 can be nine elements of six groups of branches, the f/1.75 lens, and be designed at the about 40 inches cornerwise images of about 8 feet distance projections.This projecting lens also can have a wiregrating linear polarization in the aperture diaphragm position.Need polarizer in this projecting lens to improve the contrast ratio (contrast ratio) of signal after through the wiregrating beam splitter reflection.The contrast ratio of this component only is about 20 usually: 1-50: 1.This particular design neutral line polarizer is positioned at the diaphragm place, because the incident angle minimum of this volume exclusion minimum area and light.Can also irrespectively rotate linear polarization with lens barrel, to adapt to because relay lens changes the change of the contrast ratio that focal length causes.

In addition, as shown in Figure 8, this system adopts dynamic direct current (DC) power amplification circuit 200, provides specific currents at specified time interval to each LED (solid state light emitter) chrominance channel.For each LED chrominance channel, the input of this circuit is DC power 210 and control signal 212.This circuit board 200 amplifies this DC power to regulate the electric current restriction of each LED chrominance channel in advance, and can be controlled digitally or manually, and the DC power that will amplify when receiving active control signal is fed to corresponding LED chrominance channel, thereby produces the LED light output for this particular channel.This result is can be by numerically controlled actual LED light output and regularly LED light output, and the output of this timing LED light can be (the color sequential) of color sequence for respective frame on the miniscope.This realizes with traditional electric light design very inequality, will exchange (AC) power in the traditional design and be provided to electric light, produces the light with constant frequency output.

Fig. 9 shows one in some applications the rear projection television or the general structure of other visual displays of comprising of the present invention.

Should be appreciated that, can use other embodiment, and can under the situation that does not depart from relevant range of the present invention, carry out the change of 26S Proteasome Structure and Function.Include but not limited to for may revising of this system: the less or big crystallite dimension of LED, thus allow non-four-tuple CHE and described LED to be replaced together; Signal processing apparatus is used to filter the signal that sends to miniscope, with the homogeneity that improves this light signal and improve signal to noise ratio (S/N ratio).

Claims (22)

1, a kind of non-imaging device, be used to improve collection efficiency for the light that receives from least one solid state light emitter, miniscope in the image projection optical system is launched light then, this non-imaging device comprises the compound hyperbolic transmitter based on inner full-reflection, and this compound hyperbolic transmitter integrally is installed on the crystal grain with at least one solid condition apparatus.

2, non-imaging device as claimed in claim 1, wherein this at least one solid state light emitter is at least one in red, blue or the green light emitting diode.

3, non-imaging device as claimed in claim 1, wherein the cavity in this compound hyperbolic transmitter comprises the sealant of refractive index match, is used to make light and this compound hyperbolic transmitter from this at least one emitted fully to be coupled.

4, a kind of non-imaging device, in the image projection optical system, be used to improve emission efficiency for the light that receives from least one solid state light emitter, this non-imaging device comprises the compound hyperbolic transmitter based on inner full-reflection of four-tuple, this compound hyperbolic transmitter integrally is installed on a plurality of crystal grain, and wherein each crystal grain in these a plurality of crystal grain comprises this at least one solid state light emitter.

5, non-imaging device as claimed in claim 4; wherein the compound hyperbolic transmitter based on inner full-reflection of this four-tuple comprises a plurality of independent compound hyperbolic transmitters based on inner full-reflection, and it is designed to cover these a plurality of crystal grain or chip area or part chip area.

6, non-imaging device as claimed in claim 5, wherein each this independent compound hyperbolic transmitter based on inner full-reflection aligns with the angle of each crystal grain in these a plurality of crystal grain basically, to cover these a plurality of crystal grain fully.

7, non-imaging device as claimed in claim 4, wherein at least one solid state light emitter is a light emitting diode.

8, non-imaging device as claimed in claim 4, wherein the cavity in each this independent compound hyperbolic transmitter comprises the sealant of refractive index match, is used to make the light from least one emitted fully to be coupled with this independent compound hyperbolic transmitter.

9, a kind of equipment that will make up from a plurality of signals of light emitting diode matrix emission in the image projection optical system, this equipment comprises the structure that is formed by a plurality of dichroics or calibration dichroic filter.

10, equipment as claimed in claim 9, wherein this calibration dichroic filter comprises at least one in red dichroic filter or the blue dichroic filter.

11, a kind of equipment that optical uniformity is provided at the miniscope place in the image projection optical system, this equipment comprise the diffusing globe that is positioned at basically away from the position of solid state light emitter array.

12, equipment as claimed in claim 11, wherein in this image projection optical system, the expansion that this diffusing globe is arranged in light beam reaches maximum space a bit basically, and wherein by the light that produces from this solid state light emitter array is combined to form this light beam.

13, a kind of optical system of using in the Projection Display, this system comprises:

The solid state light emitter array, wherein each this solid state light emitter in this array is related with the non-imaging device that is used to improve for from the emission efficiency of the light of this solid state light emitter array output;

Based on the equipment of dichroic filter, be used for a plurality of signals of launching from the solid state light emitter array and form from a plurality of dichroic filters are made up;

Miniscope utilizes from the light of this solid state light emitter array output and throws light on;

Diffusing globe is used for the light at this miniscope place of homogenising, and wherein in this optical system, this diffusing globe is arranged in from this expansion based on the equipment emitted light beams of dichroic filter and reaches maximum space basically a bit.

14, optical system as claimed in claim 13, wherein this non-imaging device is the compound hyperbolic transmitter based on inner full-reflection.

15, optical system as claimed in claim 13, wherein this solid state light emitter array comprises red, blue and green light emitting diode.

16, optical system as claimed in claim 13 also comprises a plurality of Fresnel lens.

17, optical system as claimed in claim 13 also comprises polarization beam apparatus, is used for the light that linear polarization is sent to this miniscope.

18, optical system as claimed in claim 17 also comprises light trap, is used to suppress from the non-flashlight of the cross polarization of this polarization beam apparatus reflection.

19, optical system as claimed in claim 15, wherein this non-imaging device is the compound hyperbolic transmitter based on inner full-reflection, it is related with a light emitting diode.

20, optical system as claimed in claim 15, wherein this non-imaging device is the compound hyperbolic transmitter based on inner full-reflection of four-tuple, it is related with a light emitting diode matrix.

21, optical system as claimed in claim 20, wherein the aperture of the compound hyperbolic transmitter of this four-tuple is circular.

22, optical system as claimed in claim 20, wherein the aperture of the compound hyperbolic transmitter of this four-tuple is triangle or other polygon.

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