CN1482487A - Projecting color display - Google Patents
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Abstract
An active light-emitting type color projection display device comprising a display unit, a projection optical system, a projection space and color light-emitting projection screen, wherein the display unit includes DMD, LCD, LcoS and TMA. When the three types of light image having various optical spectrum is projected on the color light-emitting projection screen, stimulating red, green and blue fluorescence, and being transformed into red, green and blue images respectively, finally the color images are generated, realizing color display. The advantages of the invention are large view angle, high contrast, intelligible image, simple structure and low cost.
Description
The invention relates to the improvement of colour projection display.
Along with the development that HDTV and terminal show, colour projection's display technique and device thereof play an important role, and it not only is widely used in projection TV, and can be used for both desktop monitors.Main colour projection's display mode has CRT (projection cathode-ray tube) formula, LCD (liquid crystal display) formula and DMD (Digital Micromirror Device) formula at present.Wherein display device can be only be made of a chromatic display or three monochrome display spares of red, green, blue or one group of chromatic display or array red, green, blue monochrome display spare.The CRT formula is divided into single hose and three-tube type, the complete at present three-tube type that adopts.The LCD formula is divided into single screen formula and three-screen type, also has the double screen formula in addition, and LCD comprises transmission type LCD and reflective LCD (LCoS).The DMD formula is divided into single DMD formula and three DMD formulas, also has two DMD formulas.Colour projection shows and to be divided into pre-projecting type and back projection type again, and light projects on the screen in pre-projecting type, through being radiated on the human eye behind the screen reflection, and is radiated on the human eye behind the light transmission screen in back projection type.
But there is following shortcoming in existing colour projection display: (1) visual angle is little, and (2) picture contrast in pre-projecting type is relatively poor, (3) structure more complicated of projection screen in back projection type, cost height.
The objective of the invention is to overcome the above-mentioned shortcoming that exists in the existing colour projection display.For realizing this purpose, the present invention takes following method: non-luminous projection screen is replaced with the projection screen that is coated with red, green, blue look fluorescent powder, i.e. the colorful light-emitting projection screen 1..2. the display device that will show red, green, blue look luminescent image replaces with and shows three kinds and have different spectrum (E1, E2, the display device of light image E3), when these three kinds of light images are incident upon on the colorful light-emitting projection screen, excite red, green, blue look fluorescent powder respectively, be converted to the red, green, blue color image separately, realize colored the demonstration.
Be elaborated below.
Colour projection display is to utilize projection optical system and projector space will be amplified and be presented at device on the projection screen by the colorful light-emitting image of information modulation.Colored Display projector device is made up of the display device, projection optical system, projector space and the projection screen that show luminescent image usually.The effect of projection screen provides an optical delivery surface, makes that luminescent image is incident upon on the projection screen through projection optical system on the display device, forms image, and after reflection or transmission, projects on the human eye.Because human eye is to watch image on projection screen, watches the optimal viewing angle scope of projection screen epigraph to be restricted, the brightest and the most clear when promptly watching image facing to screen, along with the visual angle increases, image is deepening and fuzzy gradually.
The pre-projecting type colour projection display obtains bigger image easily, and by adjusting the distance between display device and the screen, change the size of display image easily, but owing to the acceptance of human eye in pre-projecting type is screen reflection light, extraneous light also reflects on screen, picture contrast is subjected to ambient light effects very big, watches the room must be very dark.
Even the back projection type colour projection display is under bright environment, picture contrast is still better.But in order to enlarge angular field of view, the structure more complicated of projection screen.Projection screen is usually by three kinds of optical microstructures, and promptly Fresnel Lenses, cylindrical mirror and black streaking are formed.The effect of Fresnel Lenses is that projected light is become directional light, the effect of cylindrical mirror be make projected light in the horizontal direction with vertical direction on luminous energy be evenly distributed, the effect of black streaking is to improve contrast.Fresnel Lenses etc. are very strict to mould and die accuracy and processability requirement, so the manufacturing cost height, complex process.
In order to overcome the above-mentioned shortcoming that exists in the existing colour projection display, the present inventor proposes a class colour projection display, it is by display device, projection optical system, projector space and colorful light-emitting projection screen are formed, on display device, produce three kinds and have different spectrum (E1, E2, E3) light image, coating has the red of different exciting characteristics on the colorful light-emitting projection screen, green, blue colour fluorescent powder, the optical excitation rouge and powder of first kind of spectrum (E1) sends ruddiness, the green powder of optical excitation of second kind of spectrum (E2) sends green glow, the optical excitation blue powder of the third spectrum (E3) sends blue light, three kinds that produce on display device have different spectrum (E1, E2, E3) light image is through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, excite red respectively, green, blue colour fluorescent powder, be converted to red separately, green, blue image and form coloured image is realized colored the demonstration.The present inventor also proposes a class colour projection display, it is still by display device, projection optical system, projector space and colorful light-emitting projection screen are formed, but on display device, produce two kinds and have different spectrum (E1, E2) light image, two kinds of fluorescent powder (P1 of coating on the colorful light-emitting projection screen with different exciting characteristics and different glow colors, P2), two kinds of fluorescent powder (P1, P2) be red, green powder or red, bluish-green powder or Huang, blue powder or green, product rouge and powder etc., wherein a kind of fluorescent powder of the optical excitation of first kind of spectrum (E1) (P1) is luminous, the another kind of fluorescent powder of the optical excitation of second kind of spectrum (E2) (P2) is luminous, two kinds that produce on display device have different spectrum (E1, E2) light image is through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, and the difference excitated fluorescent powder (P1, P2), be converted to the image of different colours separately and form multicolor image, realize multicolor displaying.Therefore the key of colour projection display of the present invention is to select the spectrum of the light image that produces on the display device and be coated in fluorescent powder on the colorful light-emitting projection screen, and the spectrum of light image is decided by light source and beam splitting system.
The main effect of colorful light-emitting projection screen is to carry out the glow color conversion according to the photoluminescence principle.According to the ultimate principle of photoluminescence, the energy of ballistic phonon generally is less than or equals the energy of excitation photon, that is to say, glow color is constant or shift to long wave, Stokes' law that Here it is.For example at medium wave, long wave ultraviolet light or purple light excited following, fluorescent powder can send indigo plant, green, ruddiness; Under blue-light excited, fluorescent powder can send green, ruddiness; Excite down at green glow, fluorescent powder can send ruddiness.
The fundamental characteristics of fluorescent powder is luminosity, glow color, twilight sunset and exciting characteristic.Under different excitation spectrums, the luminosity of different fluorescent powder has very big difference.Y for example
2O
3: Eu can send very strong ruddiness under the optical excitation of 200～265nm wavelength coverage, and can only send very weak ruddiness under greater than the optical excitation of 280nm wavelength.SrGa
2S
4: Eu can send very strong green glow under the optical excitation of 365nm wavelength around, and can only send very weak green glow under the optical excitation of 254nm wavelength around.4Mg (O, F
2) .GeO
2: Mn sends very strong ruddiness under the optical excitation of 365nm wavelength around, and sends more weak ruddiness under the optical excitation of 254nm wavelength around.Zn
2SiO
4: Mn is just in time opposite, and it sends very strong green glow under the optical excitation of 254nm wavelength around, and can only send very weak green glow under the optical excitation of 365nm wavelength around.Y
3(Al, Ga)
5O
12: Ce, Y
3Al
5O
12: Ce sends strong green, gold-tinted respectively under the optical excitation of 455nm wavelength around, luminous very weak under the optical excitation of 270～320nm and 360～405nm wavelength coverage.(Sr, Ca)
10(PO
4)
6Cl
2: Eu) under the optical excitation of 200～420nm wavelength coverage, all can send strong blue light, even also can be luminous under the optical excitation of 440nm wavelength.Y
2O
2S:Eu sends strong ruddiness under the optical excitation of 200～380nm wavelength coverage, luminous very weak under the optical excitation greater than the 400nm wavelength.
If will have the fluorescent powder coated on projection screen of different exciting characteristics, promptly form the colorful light-emitting projection screen, just can convert coloured image to projecting the light image that has different spectrum on the colorful light-emitting projection screen, thereby solve that the visual angle that exists in the existing colour projection display is little, the problems such as structure more complicated, cost height of picture contrast difference and projection screen in the pre-projecting type by it.
For example the luminescent layer of colorful light-emitting projection screen is by rouge and powder Y
2O
2S:Eu and green powder Y
3(Al, Ga)
5O
12: Ce forms, and display device is made up of indium-iron lamp, beam splitting system, driving circuit and two SLM.Under the effect of beam splitting system, the light beam split that indium-iron lamp sends is the blue light of 450nm and the ultraviolet light about 370nm, wherein the blue light illumination of 450nm is on a spatial light modulator (SLM), under the green modulation, on SLM, produce the blue light image of implicit green image, UV-irradiation about 370nm under the modulation of danger signal, produces the ultraviolet light image of implicit red image on SLM on another SLM.When blue light image and ultraviolet light image through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, the optical excitation Y of blue light image
3(Al, Ga)
5O
12: Ce, the blue light image transitions is a green image, the optical excitation Y of ultraviolet light image
2O
2S:Eu, ultraviolet light image is converted to red image, and the synthetic multicolor image of green image and red image is realized multicolor displaying like this.
Beam splitting system can replace with filter wheel, only uses a SLM this moment.It is regional to divide au bleu filter area territory and ultraviolet look to filter on filter wheel.The light that indium-the iron lamp sends forms the light about 450nm and 370nm successively when the filter wheel by high speed rotating, and sequential illumination is on SLM.When the rayed of 450nm is on SLM, under the modulation of green, on SLM, produce the blue light image of implicit green image, when the rayed about 370nm is on SLM, under the modulation of danger signal, on SLM, produce the ultraviolet light image of implicit red image.Therefore they similarly can form multicolor image on the colorful light-emitting projection screen.
The also available halo of filter wheel replaces, and for example light source is the iron lamp, is divided into ultraviolet light transmissive region and blue-light-emitting zone on halo, on the blue-light-emitting zone, apply blue powder (Sr, Ca)
10(PO
4)
6Cl
2: Eu (λ m=452nm).When on the halo of the rayed about the 370nm that the iron lamp sends at high speed rotating, successively by ultraviolet light transmissive region and blue-light-emitting zone, by the blue-light-emitting zone time, it excites blue powder, produces blue light.Therefore the blue light of λ m=452nm and the ultraviolet light about 370nm can be formed in proper order equally, but brightness can be significantly improved.
In order to realize colored the demonstration, must apply three kinds of fluorescent powder of red, green, blue on the colorful light-emitting projection screen, for example the luminescent layer of colorful light-emitting projection screen is made up of two-layer luminescent layer, and ground floor is by rouge and powder Na
5Eu (WO
4)
4With green powder LiSr
2YO
4: Tb forms, the second layer by blue powder (Sr, Ca)
10(PO
4)
6Cl
2: Eu forms.Display device is made up of light source, beam splitting system, driving circuit and three SLM, and light source is lead-magnesium lamp.
LiSr
2YO
4: Tb sends strong green glow under the optical excitation of 340～365nm wavelength coverage, and can only send more weak green glow under the optical excitation of 380nm～390nm wavelength coverage, and is not luminous fully under greater than the optical excitation of 397nm wavelength.Na
5Eu (WO
4)
4Under the optical excitation of 340～365nm wavelength coverage, send very weak ruddiness, and under the optical excitation of 382nm wavelength around, send strong ruddiness, 405, under the optical excitation of 436nm wavelength luminous a little less than.
Under the effect of beam splitting system, the light beam split that lead-magnesium lamp sends is 340～361 wavelength coverages, 382～384 wavelength coverages and 405, the light of 436nm, wherein the ultraviolet light of 340～361nm wavelength coverage (S) is radiated on first SLM, under the modulation of green, on first SLM, produce ultraviolet light (S) image of implicit green image, the ultraviolet light of 382～384nm wavelength coverage (L) is radiated on second SLM, under the modulation of danger signal, on second SLM, produce ultraviolet light (L) image of implicit red image, and 405, the purple light of 436nm is radiated on the 3rd SLM, under the modulation of blue signal, on the 3rd SLM, produce the purple light image of implicit blue image.When these three light images through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, LiSr on ultraviolet excitation first luminescent layer of the 340～361nm wavelength coverage in ultraviolet light (S) image
2YO
4: Tb, ultraviolet light (S) image transitions is a green image, Na on ultraviolet excitation first luminescent layer of the 382～384nm wavelength coverage in ultraviolet light (L) image
5Eu (WO
4)
4, ultraviolet light (L) image transitions is a red image, the light of 405 in the purple light image, 436nm wavelength is by first luminescent layer, excite on second luminescent layer (Sr, Ca)
10(PO
4)
6Cl
2: Eu, the purple light image transitions is a blue image.Just can convert ultraviolet light (S) image, ultraviolet light (L) image, purple light image to green, red, blue image respectively by the colorful light-emitting projection screen like this, form full-colour image, realize panchromatic demonstration.
Similarly beam splitting system can replace with filter wheel or halo, only uses a SLM this moment.Also can and use beam splitting system and filter wheel or halo, use two SLM this moment.
According to the different structure of display device, colour projection display of the present invention can be divided into 5 kinds particularly:
(1) display device is made up of light source, filter wheel or halo, driving circuit and a SLM, under the color separation effect of filter wheel or halo, the light that light source sends forms the light of two kinds of different spectrum successively, and sequential illumination is on SLM, under the control of driving circuit, order produces two kinds of light images with different spectrum on SLM.
(2) display device is made up of light source, filter wheel or halo, driving circuit and a SLM, under the color separation effect of filter wheel or halo, the light that light source sends forms the light of three kinds of different spectrum successively, and sequential illumination is on SLM, under the control of driving circuit, order produces three kinds of light images with different spectrum on SLM.
(3) display device is made up of light source, beam splitting system, driving circuit and two SLM, under the beam splitting system effect, the light beam split that light source sends is the light of two kinds of different spectrum, and be radiated at respectively on two SLM, under the control of driving circuit, on SLM, produce two kinds of light images respectively with different spectrum.
(4) display device is made up of light source, beam splitting system, driving circuit and three SLM, under the beam splitting system effect, the light beam split that light source sends is the light of three kinds of different spectrum, and be radiated at respectively on three SLM, under the control of driving circuit, on SLM, produce three kinds of light images respectively with different spectrum.
(5) display device is made up of light source, beam splitting system and filter wheel or halo, driving circuit and two SLM, under the color separation effect of beam splitting system and filter wheel or halo, the light beam split that light source sends is the light of three kinds of different spectrum, wherein a kind of rayed of spectrum is on a SLM, under the control of driving circuit, on SLM, produce the light image of this spectrum, the fairing preface of other two kinds of spectrum is radiated on another SLM, under the control of driving circuit, the light image that order produces other two kinds of spectrum on SLM.
Light source can adopt metal halide lamp, particularly ultraviolet metal halide lamp and purple metal halide lamp, for example antimony, bismuth, zirconium, tin, zinc, lead, iron lamp, they have the ultraviolet light of various different wave lengths, the gallium lamp then has 403, the purple light of 417nm wavelength, and the indium lamp then has the blue light of 450nm wavelength.According to different needs, can adopt the metal halide lamp that contains several metal, for example lead-magnesium lamp, indium-iron lamp etc.Therefore in various metal halide lamps, generally contain mercury, in lamp, often also have 365,405, the purple light of 436nm wavelength.Except metal halide lamp, also can adopt high-pressure sodium lamp or ultrahigh pressure mercury lamp, because various ultraviolet lights, purple light are also arranged in their spectrum, for example 297,313,365,405,436nm equiwavelength's light.
SLM in the display device can adopt DMD or LCD or TMA, and LCD comprises transmission type LCD, reflective LCD (LCoS) etc.
Colorful light-emitting projection screen manufacturing process is simple, can pass through methods such as print process, spraying process with fluorescent powder coated on glass, plastics, organic glass etc.Red, green, blue look fluorescent powder can be applied as one deck on the colorful light-emitting projection screen, also can be applied as multilayer, and the colorful light-emitting projection screen can be a transmission-type, also can be reflective, and the former is used for back projection type, and the latter is used for the pre-projecting type colour projection display.In order to improve brightness and colour purity, interference filter layer, reflection horizon or UV absorption layer can be set on phosphor powder layer.
From above analysis as can be known: colour projection display of the present invention is owing to adopted the colorful light-emitting projection screen, it is the projection screen of active illuminating, when fluorescent powder on the colorful light-emitting projection screen is excited and is luminous, light is propagated to all directions, the visual angle no longer is restricted, the visual angle problem thoroughly solves, and the quality of coloured image has obtained very big improvement.
External luminous ray sees through glass (or plastics etc.) and enters in the luminescent layer in the pre-projecting type colour projection display, after the layer that is reflected again reflects, see through for the second time glass (or plastics etc.) and arrive human eye, and red, green, blue only sees through glass (or plastics etc.) and once arrives human eye in the colorful light-emitting projection screen is enameled image, therefore can reduce the influence of external luminous ray by reduction glass (or plastics etc.) transmitance, improve contrast, this with color picture tube in be the same by reducing glass screen transmitance with the principle of raising contrast.
In LCD formula colour projection display, liquid crystal display is made up of materials such as polaroid, liquid crystal, and polaroid, liquid crystal all are macromolecular materials, and they are easy to generate aging under action of ultraviolet radiation, performance change, so light source should adopt the long ultraviolet source of purple light source or wavelength.And in DMD or TMA formula colour projection display, ultraviolet ray is less to the influence of DMD or TMA, and light source can suitably adopt the short ultraviolet source of wavelength as required.But the short ultraviolet light of wavelength can damage human eye, can increase a ultraviolet color filter in the foremost of light source, and this ultraviolet light is filtered.The spectrum of light image generally be positioned at medium ultraviolet (200～320nm) to blue (430～480nm) zones are more preferably and are positioned at 280～470nm zone, preferably are positioned at 360～460nm zone.
Should note in the above description: when the light with first, second, third kind of spectrum (E1, E2, E3) excites respectively that red, green, blue powder etc. is described on the colorful light-emitting projection screen, the light that often is meant spectrum E1, E2, E3 mainly excites red, green, blue powder on the colorful light-emitting projection screen respectively, being them also can excite to some extent to other fluorescent powder, but luminous a little less than, He Cheng light still is respectively the red, green, blue look at last.
Fig. 1～Fig. 6 is a colour projection display of the present invention, La represents light source in Fig. 1 (a)～6 (a), FW, LW represent filter wheel, halo respectively, M and M1, M2, M3 represent SLM and first, second, third SLM respectively, and TIR represents total reflection prism, and CSP represents colour splitting prism, O represents condenser system, PL represents projecting lens, and PS represents projector space, and S represents the colorful light-emitting projection screen.PBS represents polarizing beam splitter in Fig. 5 (a)～6 (a), and RM and RM1, RM2 represent catoptron and first, second catoptron respectively, and DM1, DM2, DM3, DM4 represent first, second, third, fourth dichronic mirror respectively, IR represents infrared-ultraviolet color filter.P1, P2 represent forward and backward substrate respectively in Fig. 1 (b)～6 (b), and L and L1, L2 represent luminescent layer and first, second luminescent layer respectively, and Re represents the reflection horizon, and Ab represents absorption layer, and IF represents the interference filter layer.
Specify with example below.
Example 1
Fig. 1 is the pre-projecting type colour projection display.La is the iron lamp in Fig. 1, and LW is a halo, and O is a condenser system, and TIR is the internal reflection prism, and M is DMD, and PL is a projecting lens, and PS is a projector space, and S is the colorful light-emitting projection screen.On halo, be divided into ultraviolet light transmissive region and blue-light-emitting zone, on the blue-light-emitting zone, apply blue powder (Sr, Ca)
10(PO
4)
6Cl
2: Eu (λ m=452nm).S is made up of preceding plastic plate P1, back plastic plate P2, luminescent layer L and reflection horizon Re.L is by green powder Y
3(Al, Ga)
5O
12: Ce and rouge and powder Y
2O
2S:Eu forms.When on the halo of the UV-irradiation about the 370nm that the iron lamp sends at high speed rotating, it is successively by ultraviolet light transmissive region and blue-light-emitting zone, and by the blue-light-emitting zone time, it excites blue powder, produces blue light.When the UV-irradiation about 370nm is on M, under the modulation of danger signal, on M, produce the ultraviolet light image of implicit red image.When the blue light illumination of λ m=450nm is on M, under the modulation of green, on SLM, produce the blue light image of implicit green image.When ultraviolet light image and blue light image through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, the optical excitation Y of ultraviolet light image
2O
2S:Eu, ultraviolet light image is converted to red image, the optical excitation Y of blue light image
3(Al, Ga)
5O
12: Ce, the blue light image transitions is a green image, the synthetic multicolor image of green image and red image is realized multicolor displaying like this.
Example 2
La is iron-indium lamp in Fig. 2, and CSP is a colour splitting prism, and M1, M2 are reflective LCDs, and all the other are with example 1.Under the effect of CSP, the light beam split that indium-iron lamp sends is the blue light of 450nm and the ultraviolet light about 370nm, wherein the blue light illumination of 450nm is on M1, under the modulation of green, on M1, produce the blue light image of implicit green image, UV-irradiation about 370nm under the modulation of danger signal, produces the ultraviolet light image of implicit red image on M2 on M2.When blue light image and ultraviolet light image through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, the optical excitation Y of blue light image
3(Al, Ga)
5O
12: Ce, the blue light image transitions is a green image, the optical excitation Y of ultraviolet light image
2O
2S:Eu, ultraviolet light image is converted to red image, and green image and red image are synthesized multicolor image, realize multicolor displaying.
Example 3
Fig. 3 is the pre-projecting type colour projection display.La is lead-zirconium lamp in Fig. 3, and FW is a filter wheel, and CSP is a colour splitting prism, and M1, M2 are DMD.Being divided into ultraviolet light colour filter zone and purple on filter wheel filters regional.Colorful light-emitting projection screen S is made up of preceding plastic plate P1, back plastic plate P2, luminescent layer L1, luminescent layer L2, uv absorption layer Ab and reflection horizon Re.L1 is by rouge and powder Na
5Eu (WO
4)
4With green powder LiSr
2YO
4: Tb forms, L2 by blue powder (Sr, Ca)
10(PO
4)
6Cl
2: Eu forms.The effect of Ab is to absorb ultraviolet light, eliminates ultraviolet light exciting blue powder.The effect of Re is the whole light of reflection, improves brightness.All the other are with example 2.During the FW of the light that sends when lead-zirconium lamp by high speed rotating, beam split is purple light (405 with 436nm light) and the ultraviolet light light of 382～384nm wavelength coverage (355～365 and) successively.Purple light is radiated on the M1, under the modulation of blue signal, produces the purple light image of implicit blue image on M1.Ultraviolet light is by CSP the time, beam split is the light of 355～365nm and 382～384nm wavelength coverage, wherein the ultraviolet light of 355～365nm wavelength coverage (S) is radiated on the M2, under the modulation of green, on M2, produce ultraviolet light (S) image of implicit green image, the ultraviolet light of 382～384nm wavelength coverage (L) is radiated on the M1, under the modulation of danger signal, produces ultraviolet light (L) image of implicit red image on M1.When these three light images through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, LiSr on ultraviolet excitation first luminescent layer of 355～365nm wavelength coverage in ultraviolet light (S) image
2YO
4: Tb, ultraviolet light (S) image transitions is a green image, the Na on ultraviolet excitation first luminescent layer of the 382～384nm wavelength coverage in ultraviolet light (L) image
5Eu (WO
4)
4, ultraviolet light (L) image transitions is a red image, the light of 405 in the purple light image, 436nm wavelength is by first luminescent layer, excite on second luminescent layer (Sr, Ca)
10(PO
4)
6Cl
2: Eu, the purple light image transitions is a blue image.Just can convert ultraviolet light (S) image, ultraviolet light (L) image, purple light image to green, red, blue image respectively by the colorful light-emitting projection screen like this, form full-colour image, realize panchromatic demonstration.
Example 4
Fig. 4 is the back projection type colour projection display.La is tin-gallium lamp in Fig. 4, and CSP is a colour splitting prism, and M1, M2, M3 are DMD.Colorful light-emitting projection screen S is made up of preceding plastic plate P1, back plastic plate P2, luminescent layer L1, luminescent layer L2, uv absorption layer Ab and interference filter layer IF.L1 is made up of rouge and powder CaS:Eu and CaS:Ce, L2 by blue powder (Sr, Ca)
10(PO
4)
6Cl
2: Eu, the effect of IF is to allow ultraviolet light, purple light see through and the reflection red, green, blue, improves brightness.All the other are with example 3.CaS:Ce sends strong green glow under the optical excitation of 315～335nm range of wavelength, in 280～310nm wavelength coverage with luminous hardly under greater than the optical excitation of 400nm.And CaS:Eu sends strong ruddiness under the optical excitation of 260～300nm range of wavelength, and is luminous hardly under greater than the optical excitation of 315nm wavelength.
When tin-gallium lamp is worked, send 284,286,301,318,326,403,405,417, the light of 436nm, when they passed through CSP, beam split was the ultraviolet light (S) of 284～301nm wavelength coverage, the ultraviolet light (L) of 318～326nm wavelength coverage and the purple light of 403～436nm wavelength coverage.Ultraviolet light (S), ultraviolet light (L) and purple light are radiated at respectively on M1, M2, the M3, press reason same in the example 3, on M1, M2, M3, produce ultraviolet light (S) image of implicit red image, ultraviolet light (L) image of implicit green image and the purple light image of implicit blue image respectively.When these three light images through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, be converted to the red, green, blue color image respectively, form full-colour image, realize panchromatic demonstration.
Example 5
Fig. 5 is the back projection type colour projection display.La is lead-zirconium lamp in Fig. 5, and DM1, DM2, DM3, DM4 are dichronic mirrors, and RM1, RM2 are catoptrons, and IR is infrared-ultraviolet color filter, and it filters the infrared and ultraviolet light following wavelength of 355nm that light source produces.M1, M2, M3 are LCD, and the structure of colorful light-emitting projection screen S is with example 4, wherein the composition of L1, L2 and all the other are with example 3.The rayed of sending when lead-zirconium lamp is during at DM1, and wherein the ultraviolet light of 355～365nm wavelength coverage (S) is reflected, and is incident upon on the M3 through RM2 again, under the modulation of green, produces ultraviolet light (S) image of implicit green image on M3.The light of 382～384nm and 405～436nm wavelength coverage is by behind the DM1, be radiated on the DM2, wherein the ultraviolet light of 382～384nm wavelength coverage (L) is reflected, and is incident upon on the M2, under the modulation of danger signal, on M2, produce ultraviolet light (L) image of implicit red image.The light of 405～436nm wavelength coverage is radiated on the M1 by behind the DM2, under the blue signal modulation, produces the purple light image of implicit blue image on M1.When these three light images through RM1, DM3, DM4, again through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, convert green, red, blue image respectively to, form full-colour image, realize panchromatic demonstration.
Example 6
O is a collector lens in Fig. 6, and RM is a catoptron, and PBS is a polarizing beam splitter, and CSP is a colour splitting prism, and M1, M2, M3 are reflective LCDs, and all the other are with example 5.Light arrival PBS after the RM reflection when lead-zirconium lamp sends becomes the s-polarized light through the PBS polarization, enters CSP, under the effect of CSP, the ultraviolet light of 355～365nm wavelength coverage (S) is incident upon on the M1, under the modulation of green, produces ultraviolet light (S) image of implicit green image on M1; The ultraviolet light of 382～384nm wavelength coverage (L) is incident upon on the M2, under the modulation of danger signal, produces ultraviolet light (L) image of implicit red image on M2; The light of 405～436nm wavelength coverage is incident upon on the M3, under the blue signal modulation, produces the purple light image of implicit blue image on M3.These three light images are after M1, M2, M3 modulation, become the p-polarized light, they turn back to PBS along the path of s-polarized light again, pass through PBS at last, through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, convert green, red, blue image respectively to, form full-colour image, realize panchromatic demonstration.
Claims (10)
1. colour projection display, it is characterized in that it is by display device, projection optical system, projector space and colorful light-emitting projection screen are formed, on display device, produce two kinds and have different spectrum (E1, E2) light image, two kinds of fluorescent powder (P1 of coating on the colorful light-emitting projection screen with different exciting characteristics and different glow colors, P2), two kinds of fluorescent powder (P1, P2) be red, green powder or red, bluish-green powder or Huang, blue powder or green, product rouge and powder, wherein a kind of fluorescent powder of the optical excitation of first kind of spectrum (E1) (P1) is luminous, the another kind of fluorescent powder of the optical excitation of second kind of spectrum (E2) (P2) is luminous, two kinds that produce on display device have different spectrum (E1, E2) light image is through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, and the difference excitated fluorescent powder (P1, P2), be converted to the image of different colours separately and form multicolor image, realize multicolor displaying.
2. colour projection display, it is characterized in that it is by display device, projection optical system, projector space and colorful light-emitting projection screen are formed, on display device, produce three kinds and have different spectrum (E1, E2, E3) light image, coating has the red of different exciting characteristics on the colorful light-emitting projection screen, green, blue colour fluorescent powder, the optical excitation rouge and powder of first kind of spectrum (E1) sends ruddiness, the green powder of optical excitation of second kind of spectrum (E2) sends green glow, the optical excitation blue powder of the third spectrum (E3) sends blue light, three kinds that produce on display device have different spectrum (E1, E2, E3) light image is through projection optical system, projector space, when being incident upon on the colorful light-emitting projection screen, excite red respectively, green, blue colour fluorescent powder, be converted to red separately, green, blue image and form coloured image is realized colored the demonstration.
3. according to any one described colour projection display in the claim 1 to 2, it is characterized in that its display device is made up of light source, filter wheel or halo, driving circuit and a SLM, under the color separation effect of filter wheel or halo, the light that light source sends forms the light of two or three different spectrum successively, and sequential illumination is on SLM, under the control of driving circuit, order produces two or three light image with different spectrum on SLM.
4. colour projection display according to claim 1, it is characterized in that display device is made up of light source, beam splitting system, driving circuit and two SLM, under the beam splitting system effect, the light beam split that light source sends is the light of two kinds of different spectrum, and be radiated at respectively on two SLM, under the control of driving circuit, on SLM, produce two kinds of light images respectively with different spectrum.
5. colour projection display according to claim 2, it is characterized in that display device is made up of light source, beam splitting system, driving circuit and three SLM, under the beam splitting system effect, the light beam split that light source sends is the light of three kinds of different spectrum, and be radiated at respectively on three SLM, under the control of driving circuit, on SLM, produce three kinds of light images respectively with different spectrum.
6. colour projection display according to claim 2, it is characterized in that display device is by light source, beam splitting system and filter wheel or halo, driving circuit and two SLM form, under the color separation effect of beam splitting system and filter wheel or halo, the light beam split that light source sends is the light of three kinds of different spectrum, wherein a kind of rayed of spectrum is on a SLM, under the control of driving circuit, on SLM, produce the light image of this spectrum, the fairing preface of other two kinds of spectrum is radiated on another SLM, under the control of driving circuit, the light image that order produces other two kinds of spectrum on SLM.
7. according to any one described colour projection display in the claim 1 to 6, it is characterized in that the SLM in the display device is DMD or LCD or LCoS or TMA.
8. according to any one described colour projection display in the claim 1 to 7, it is characterized in that the light source in the display device is metal halide lamp or high-pressure sodium lamp or ultrahigh pressure mercury lamp.
9. according to any one described colour projection display in the claim 1 to 8, the spectrum that it is characterized in that the light image that produces on the display device is positioned at medium ultraviolet, and (200～320nm) to blue (430～480nm) zones, be more preferably and be positioned at 280～470nm zone, preferably be positioned at 360～460nm zone.
10. according to any one described colour projection display in the claim 1 to 9, it is characterized in that red, green, blue look fluorescent powder can be applied as one deck on the colorful light-emitting projection screen, also can be applied as multilayer, the colorful light-emitting projection screen can be a transmission-type, also can be reflective, reflection horizon, interference filter layer or UV absorption layer can be set on phosphor powder layer.
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| CNB021284962A CN1311272C (en) | 2002-09-14 | 2002-09-14 | Projecting color display |
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| CNB021284962A CN1311272C (en) | 2002-09-14 | 2002-09-14 | Projecting color display |
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