CN1726721A - Scrolling color projection system incorporating electro-optic light modulator and rotating light-reflective element - Google Patents
Scrolling color projection system incorporating electro-optic light modulator and rotating light-reflective element Download PDFInfo
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- CN1726721A CN1726721A CNA2003801058546A CN200380105854A CN1726721A CN 1726721 A CN1726721 A CN 1726721A CN A2003801058546 A CNA2003801058546 A CN A2003801058546A CN 200380105854 A CN200380105854 A CN 200380105854A CN 1726721 A CN1726721 A CN 1726721A
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- light
- color
- colour projection
- projection system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
- H04N9/3117—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing two or more colours simultaneously, e.g. by creating scrolling colour bands
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/72—Modifying the appearance of television pictures by optical filters or diffusing screens
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
Abstract
A method for color projection is provided in which light is generated from a light source and converted into a plurality of mutually different color bands including at least a first color, a second color, and a third color by directing the light from the light source onto at least three surface segments of a rotationally-symmetric element having an axis of rotation. By rotating the rotationally-symmetric element about the axis of rotation, the plurality of mutually different color bands are scrolled across a display-image-producing electro-optical light modulator panel such that at least three of the mutually different color bands including at least the first, second, and third colors are scrolling across the electro-optical light modulator panel at the same time.
Description
The present invention relates to colour projection system, more specifically relate to the optical projection system that comprises single electric light optical modulator and rotation light reflection element.
In the known sequential color projection display system, white light source is divided into red, blue and green beamlet, to be used for becoming to assign to modulate respectively, then modulated beamlet is reassembled into panchromatic demonstration and watches on the screen so that project by the respective color of input shows signal.Usually utilize three independently the electric light optical modulator carry out the modulation of beamlet, this modulator is LCD (LCD) plate for example, in corresponding three beamlets of each modulator one.
In a kind of colour projection system of describing in people's such as for example Janssen the U.S. Patent No. 5,532,763, modulate whole three beamlets by single LCD plate.This is by beamlet is configured as ribbon-like cross section, and these bands of continuous rolling are by the LCD plate, and these parts on the plate that addressing is synchronously simultaneously shone by these bands with corresponding shows signal information realize.This optical projection system is called veneer rolling raster (single panelscrolling raster-SPSR) projecting apparatus in this article.
Use red, indigo plant and green glow the optical efficiency that three plate systems of the light valve panel that be equivalent to adopt same type are provided of the overwhelming majority by single light valve panel simultaneously.Only use veneer to eliminate to assemble to be formed on the demand of the different colours image on the different plates, and reduced system cost for machinery.
For example, the various tourelles that are used for this SPSR system are disclosed in people's such as Melnik U.S. Patent No. 5,548,347.The system that adopts single prism tourelle is simple and compact, and polygon prism (separate or physically connect) tourelle provides better rolling speed uniformity (for for the different colours light belt) and rolling speed linearity (for each light belt) than single prism system.System shown in Figure 16, that adopt three prisms that physically separate that are arranged in light path separately as this patent provides than the better optical efficiency of prism that adopts three physically to connect, but not too compact.
In the U.S. Patent No. 6,266,105 of Gleckman, disclose and only used a moving-member to realize the improvement SPSR colour projection system of rolling.In this system, illumination beam is not divided into independently column of colour before rolling, and this optical texture is simple and compact.Single rotation symmetric element with reflecting surface part has the different color zones of reflections, this rotation symmetric element is around its axle rotation, the white light that the while light source sends incides on the reflecting surface, and the surface portion that reflexes in the relay lens (relay lense) by the color belt with needs is divided into each color component, and this relay lens partly is imaged onto the element surface of regulation on the light modulation panel.Being rotated in single electric light light modulation panel from the color belt of this element reflects by it rolls.In rolling process, drive electronics synchronously addressing has the plate of the respective color composition of display message.
The rotation symmetric element of Gleckman has periphery, and the reflecting part comprises dichroic filter, and the cylindrical curvature of its cylindrical curvature and this element surface is complementary.When the normal along element surface is inducted into irradiating light beam, retroeflection can take place in this curvature, thereby guarantee in rotary course the color displacement minimum that the angle sensitivity by the cut-off wavelength of dichroic filter produces, and guarantee the aberration minimum in the process of this surface imaging to the plate.And this reflecting element that adopts in aforesaid retroeflection pattern (for example rousing) can have little cross section (for example diameter is less than 40mm), and this has further reduced size and cost.
This reflecting element has been eliminated for the demand that white light is divided into a plurality of beamlets before rolling as the tourelle in the SPSR system, thereby and can obtain littler light modulation panel (less than 1.3 inches), and the littler optics of corresponding acquisition.Therefore, simple and compact optical texture is possible, causes the few compact projector of number of components.
Yet, in the device that Gleckman discloses, have identical size from the color belt and the light modulation panel of element reflects.Utilize the rotating element of this or similar type, the drum that is used for rotating element has reflection or the transmissive color filters that certain combination according to red/green/blue order is provided with.The light that incides on this drum reflects or transmission via suitable optical element, makes color transition focus on the display device.When this drum rotation, color is rolled downwards on this equipment, makes that another color boundaries appears at the top when color boundaries moves down and arrive the bottom on this plate.Indigo plant/red border etc. is followed on red/green border.Therefore, on this plate, there are two kinds of color spots at the most, i.e. a color transition at any given time.
Revise this device, make whole three kinds of colors appear at simultaneously on this plate, preferred area equates that this should generate more good-looking picture, and this is because can observe whole three kinds of color components in the definite identical moment.Therefore in this article in the preferred embodiment of disclosed device, whole three kinds of colors show as independently bar simultaneously, and roll on this plate jointly.For example, when the bottom of this plate is left in the red field rolling, new red field appears at the top, this mode with Philips rolling color structure is identical, in this structure, produce the rolling color by light by the rotating prism reflection, difference herein is that by rotating element for example drum provides the color belt of rolling.
Correspondingly, according to an aspect of the present invention, provide a kind of equipment that is used for colour projection, it comprises light source; Rotation symmetric element with rotating shaft and a plurality of surface section, the light that light source can be sent are provided as a plurality of different color belts mutually, comprise first color, second color and the 3rd color at least; First optical circuit (optical circuit) is used for the light that light source sends is directed to surface section; Produce the electric light light modulation panel of display image; Second optical circuit, be used for and be directed to light modulation panel from the light of surface section, when the rotation symmetric element rotates around rotating shaft, comprise that at least at least three mutual different color belts of first color, second color and the 3rd color roll simultaneously on the electric light light modulation panel like this.
According to a further aspect in the invention, a kind of method that is used for colour projection is provided, wherein light source produces light, and is directed to by the light that light source is sent at least three surface section of the rotation symmetric element with rotating shaft and this light is changed into a plurality of different color belts mutually that comprise first color, second color and the 3rd color at least.By rotating this rotation symmetric element around rotating shaft, a plurality of mutually different color belts roll on the electric light light modulation panel that produces display image, make at least three mutual different color belts whiles that comprise first, second and the 3rd color at least roll on the electric light optical modulator.
Now, will be with reference to the accompanying drawings to describe the present invention according to the preferred embodiment of limited quantity, in the accompanying drawings:
Fig. 1 is the perspective view of reflection colour drum according to an embodiment of the invention;
Fig. 2 A is the diagrammatic, cross-sectional figure of a part of an embodiment of reflecting segment of the drum of Fig. 1;
Fig. 2 B is the diagrammatic, cross-sectional figure of a part of another embodiment of reflecting segment of the drum of Fig. 1;
Fig. 2 C is the diagrammatic, cross-sectional figure of a part of another embodiment of reflecting segment of the drum of Fig. 1;
Fig. 3 is the schematic diagram of an embodiment of colour projection system of the present invention, and it comprises color drum of Fig. 1, and comprises the set of lenses of dolly-out,ing dolly-back, three relay lenss and two polarization beam apparatus (polarization beam splitter-PBS).
Fig. 1 has represented the transmission plot of the exemplary embodiment of reflection colour drum 10 of the present invention, this drum has rotating shaft X and 18 dichroic color segment 11, each color segment has occupied about 20 degree of circumference, they are according to the order-reflected red, green and blue light of red/green/blue (R/G/B), and this repeats 6 times in proper order on the face of cylinder 12 of this drum.Red/indigo plant/green order that other embodiment can use.In theory, can perhaps can be more than 18 color segment on the contrary less to having 6 or 9 color segment.Exact number depends on the rotary speed of the drum that hope obtains and the addressing speed of the electric light optical modulator that hope obtains.
Reflecting segment 11 is used for versicolor light is reflexed to the electric light light modulation panel that produces display image, and this modulation panel is reflective LCD plate (RLCD) 72 (in Fig. 3 as seen) in the present embodiment.
Prevent to get back at the blanking bar between the color segment 11 14 in time interval of " pass " state RLCD is thrown light in pixel.One or more white segment that interpolation is scattered with color segment can cause the light output increase of this system to reach 50%.Be typically, each RGB group that white segment can the section of adding to 11, thus producing for example 24 sections modification of the drum of Fig. 1, it has the color segment sequence that for example repeats.
For example, form each dichroic filter, then these sheets are divided into section 11 with appropriate size by going up at the plastic sheet (for example 80 micron thickness) of independent thin, flex substrate-for example or sheet glass (for example 50 micron thickness), just can the section of manufacturing 11.Then the section of making 11 bendings are to meet bulging surface and for example to utilize binding agent to adhere to.
Preferably, this flexible strip is plastics, selects from Merlon of cold plastics-for example and polyester, perhaps for example selects the polyimides (for example KAPTONTM) from high temperature plastics.Suitable dichroic coating deposition process comprises sputter (under the situation of cold plastics), and thermal evaporation (under the situation of high temperature plastics).
The setting of section 11 and the selection of adjacent layer preferably should be such, absorb or the light of scattering wavelength outside zone of reflections wavelength with the angle outside the collection angle of relay system basically.
Fig. 2 A be one of reflecting segment 11 of drum of Fig. 1 may embodiment the diagrammatic, cross-sectional figure of a part.Thin slice 122 supports dichroic filter layer 123, and be bonded to drum surface 120 by tack coat 121.Layer 121 and 122 is normally light transmissive.Therefore, drum surface 120 should be absorbing light (for example black sulfonium) or scattered light.Can select or in addition, can be by add pigments or scattering particles to layer 121 and/or layer 122 these these layers be made absorbing light or scattered light.Therefore the light that is reflected by filter layer 123 will do not absorbed or scattering by following structure.
Fig. 2 B is the cross-sectional view similar to Fig. 2 A, has wherein formed quarter-wave plate 124 and anti-reflecting layer 125 on dichroic filter layer 123.This configuration can utilized bandwidth and the simple single shaft thin slice that is complementary of the bandwidth of filter, thereby can omit the plate that broadband shown in Figure 3 is a quarter-wave.
Fig. 2 C has represented the optional embodiment of the reflecting segment 11 of drum, and wherein transmission dichroic filter layer 128 has replaced the reflection dichroic filter layer 123 among Fig. 2 A embodiment.For example, evaporation coating 126 by aluminium is come cremasteric reflex, and be inserted in the quarter-wave plate 127 between reflector 126 and the filter layer 128, rely on transmitted light twice by this layer, once as incident light, once (light by dichroic filter reflection has unaltered polarization as reverberation, and therefore quilt PBS subsequently gives up), polarization of incident light is become S from P.
Fig. 3 is the schematic diagram of an embodiment of colour projection system of the present invention, and it comprises and similar color drum 58 shown in Figure 1 having reflection dichroic filter section in its surface, figure 3 illustrates wherein two 60 and 62.Make light source 38-be preferably that the illumination of high-intensity light source is all even to become rectangle by integrator plate 40a and 40b, change P type polarised light into by plane P CS (polarization conversion system) 42 then, described high-intensity light source is high-intensity discharge (HID) lamp for example, such as the UHP lamp.
The light that first optical circuit 100 sends light source 38 is directed to the surface of going barrel 58.The set of lenses of dolly-out,ing dolly-back 44,46 and 48 has formed heart P illuminating bundle far away at PBS 50 and quarter-wave plate 54 places, and this wave plate is formed on the surface of PBS 50 in the present embodiment.The set of lenses of dolly-out,ing dolly-back has reduced the optical path length between PCS 42 and the PBS 50.Alternatively, can use simpler lens combination with at least one lens element.
This P light beam arrives cylindrical lenss 56 by polarization beam apparatus (PBS) 50 and wideband quarter wave plate 54, and this cylindrical lens focuses on the surface of going barrel 58 (promptly along drum normal to a surface direct light) light with the incidence angle that retroeflection takes place.This with regard to having eliminated because the dependence of angle of the color zone of reflections of dichroic filter and the color displacement that may occur.The heart characteristic far away of incident beam has been guaranteed the lip-deep identical incidence angle of drum.
After drum 58 reflection, second optical circuit 200 is directed to light on the light modulation panel from surface section.Quarter-wave plate 54 changes P type polarised light into the S type, and therefore the reflecting surface 52 by PBS 50 reflects it in relay lens 64 and 66, and the function of relay lens is that filter is imaged onto on the RLCD 72.
Relay lens system 56,64 and 66 should have enough quality and filter segments accurately is imaged onto on the RLCD, and the section of not having is overlapping or overlapping not obvious, thereby avoids blend of colors or remain on permissible degree to major general's blend of colors.When lens 56 were cylindrical lens, lens 64 and 66 can be axisymmetric, molded aspheres for example, and it has the advantage that reduces optical path length.
The reflecting surface 70 of PBS 68 will reflex on the RLCD from the light of relay lens 56,64 and 66, and RLCD changes this light according to shows signal, and to produce display image, this shows signal is for example imported 37, applied by drive electronics 36 from video.RLCE reflexes to projecting lens 74 with image via PBS 68, gives spectators with projection.RLCD 72 becomes S light again P light under bright state, to be used for by projecting lens 74 projections.
The reflecting surface 70 of the reflecting surface 52 of PBS 50 and relay lens 64,66 and PBS 68 keeps the heart characteristic far away of folded light beam, thereby each pixel observation of guaranteeing LCD arrives the identical incidence angle of passing through PBS 68.Therefore, on the image that RLCD 72 generates, there is the variation that seldom or not has color, brightness or contrast.
PBS can have conventional (MacNeille) type of glass, perhaps can be the lighter polymer type of weight (" the A Recent Advance in ReflectivePolarizer Technology " that on 1997 International DisplayResearch Conference, delivers referring to D.Wortman, be incorporated herein by reference in the lump herein), if yet hope obtains the image of first water, so preferably use the PBS 68 of type of glass, this is because can make reflecting surface 70 optically more flat under the situation than polymer type.
Wideband quarter wave plate can be the colourless lamination of for example single shaft thin slice, single non-single shaft thin slice, and perhaps people such as Broer is in U.S. Patent No. 5,506, the single polymer layer liquid crystal of the type of describing in 704.
The present invention has been described with regard to the embodiment of limited quantity.The modification of other embodiment, embodiment and equivalent well known in the art are conspicuous for those skilled in the art, and are intended to be included in the scope of the present invention that proposes as appended claims.
For example, replace drum, this rotation symmetric element can be faceted element, for example has the polyhedron of polygon cross section.The reflecting surface section or the facet of this element can also tilt with respect to rotating shaft, and the situation of this and conical component is the same, so that direct reflected light is away from the path of incident light.
Be substituted in the substrate and form reflecting segment and substrate is attached to this element, this reflecting segment can be formed directly on the surface of this element, for example by they are realized by mask deposition.
Replacement begins, becomes the S type with P type polarization and becomes the P type then again to be used for projection, and this polarization type can be opposite, promptly begins, becomes the P type and become the S type again with the S type.
At last, can make other embodiments of the invention, wherein surface section is transmission, rather than reflection.Can realize using the modification of transmissive segments easily, for example use plane or conical color wheel or have for example middle hollowing of internal reflection element.
Claims (20)
1. colour projection system comprises:
Light source;
Rotation symmetric element with rotating shaft and a plurality of surface section, its light that light source can be sent are provided as a plurality of different color belts mutually, and this color belt comprises first color, second color and the 3rd color at least;
First optical circuit is used for the light that light source sends is directed to surface section;
Produce the electric light light modulation panel of display image;
Second optical circuit, be used for and be directed to light modulation panel from the light of surface section, when the rotation symmetric element rotates around rotating shaft, comprise that at least at least three mutual different color belts of first color, second color and the 3rd color roll simultaneously on the electric light light modulation panel like this.
2. colour projection system according to claim 1, wherein this surface section is the curved surface section.
3. colour projection system according to claim 2, wherein the curvature of this surface section is mated the curvature of this element surface.
4. colour projection system according to claim 1, wherein this surface section is a cylinder curved surface section.
5. colour projection system according to claim 1, surface section that wherein should the surface comprises dichroic filter.
6. colour projection system according to claim 5, wherein this dichroic filter is formed on the supporter, and this supporter is bonded in element surface.
7. colour projection system according to claim 5, wherein this dichroic filter has the color zone of reflections.
8. colour projection system according to claim 5, wherein this dichroic filter has color transmission band.
9. colour projection system according to claim 1, wherein this first optical circuit comprises cylindrical lens.
10. colour projection system according to claim 1, it comprises the light integrators that is used for the light that light source sends is integrated into telecentric beam.
11. colour projection system according to claim 1, it comprises the polarizer that is used for the light that light source sends is changed into P type polarised light.
12. colour projection system according to claim 1, it comprises the polarizer that is used for the light that light source sends is changed into S type polarised light.
13. colour projection system according to claim 1, wherein this first optical circuit comprises the set of lenses of dolly-out,ing dolly-back.
14. the method for a colour projection comprises:
Produce light from light source;
Be directed to by the light that light source is sent at least three surface section of the rotation symmetric element with rotating shaft, the light that light source is sent changes a plurality of different color belts mutually that comprise first color, second color and the 3rd color at least into;
By around revolve+rotating shaft rotates this rotation symmetric element, a plurality of mutually different color belts roll on the electric light light modulation panel that produces display image, make at least three mutual different color belts whiles that comprise first, second and the 3rd color at least roll on the electric light optical modulator.
15. colour projection according to claim 14 method, wherein the curvature of this surface section is mated the curvature of this element surface.
16. colour projection according to claim 14 method, wherein this surface section is a cylinder curved surface section.
17. colour projection according to claim 14 method, surface section that wherein should the surface comprises dichroic filter.
18. colour projection according to claim 14 method comprises and uses cylindrical lens that the light that light source sends is directed to surface section.
19. colour projection according to claim 14 method comprises and uses light integrators that the light that light source sends is integrated in the telecentric beam.
20. colour projection according to claim 14 method comprises and uses polarizer that the light that light source sends is become polarised light.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US43341902P | 2002-12-13 | 2002-12-13 | |
| US60/433,419 | 2002-12-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1726721A true CN1726721A (en) | 2006-01-25 |
Family
ID=32595186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2003801058546A Pending CN1726721A (en) | 2002-12-13 | 2003-12-05 | Scrolling color projection system incorporating electro-optic light modulator and rotating light-reflective element |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1574074A1 (en) |
| JP (1) | JP2006510055A (en) |
| KR (1) | KR20050085620A (en) |
| CN (1) | CN1726721A (en) |
| AU (1) | AU2003283738A1 (en) |
| WO (1) | WO2004056130A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293840A (en) * | 2012-02-22 | 2013-09-11 | 台达电子工业股份有限公司 | Light source system and projecting device comprising same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6980346B1 (en) * | 2004-09-15 | 2005-12-27 | Hewlett-Packard Development Company, L.P. | Display device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6266105B1 (en) * | 1998-07-31 | 2001-07-24 | Philips Electornics North America Corporation | Color projection system incorporation electro-optic light modulator and rotating light-reflective element |
| CN1187989C (en) * | 1999-12-24 | 2005-02-02 | 皇家菲利浦电子有限公司 | Color projection system |
| US6540362B1 (en) * | 2000-08-09 | 2003-04-01 | Koninklijke Philips Electronics N.V. | Scrolling multi-stripe color illumination system |
-
2003
- 2003-12-05 EP EP03775719A patent/EP1574074A1/en not_active Withdrawn
- 2003-12-05 CN CNA2003801058546A patent/CN1726721A/en active Pending
- 2003-12-05 WO PCT/IB2003/005769 patent/WO2004056130A1/en not_active Application Discontinuation
- 2003-12-05 KR KR1020057010785A patent/KR20050085620A/en not_active Application Discontinuation
- 2003-12-05 AU AU2003283738A patent/AU2003283738A1/en not_active Abandoned
- 2003-12-05 JP JP2004560054A patent/JP2006510055A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293840A (en) * | 2012-02-22 | 2013-09-11 | 台达电子工业股份有限公司 | Light source system and projecting device comprising same |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20050085620A (en) | 2005-08-29 |
| WO2004056130A1 (en) | 2004-07-01 |
| JP2006510055A (en) | 2006-03-23 |
| EP1574074A1 (en) | 2005-09-14 |
| AU2003283738A1 (en) | 2004-07-09 |
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