CN103076712B - Projection light source and projection device using same - Google Patents
Projection light source and projection device using same Download PDFInfo
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- CN103076712B CN103076712B CN201110329788.7A CN201110329788A CN103076712B CN 103076712 B CN103076712 B CN 103076712B CN 201110329788 A CN201110329788 A CN 201110329788A CN 103076712 B CN103076712 B CN 103076712B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
- G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Astronomy & Astrophysics (AREA)
- Spectroscopy & Molecular Physics (AREA)
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- Projection Apparatus (AREA)
Abstract
The invention provides a projection light source and a projection device. The projection light source comprises a light source and a color wheel. The light source is used for generating exciting light. The color wheel faces the light source, rotates around a rotating shaft, and comprises a plurality of optical wavelength conversion regions which are arranged on a propagation path of the exciting light source to receive the exciting light and to convert the exciting light into fluorescence corresponding to the optical wavelength conversion regions. The fluorescence generates a colored light sequence of a periodic time sequence along with the rotation of the color wheel. The exciting light generated by the light source forms light spots on the color wheel, and the projection sizes of the light spots in the direction of motion of the color wheel are larger than those of the light spots in at least another direction of the color wheel. According to the projection light source, the position and the direction of the exciting light projected onto the color wheel are regulated, so that the fluorescence efficiency of the color wheel can be improved, the temperature of a light spot region on the color wheel can be reduced, the efficiency of output light of the projection light source can be improved, and the stability of the color temperature and the chromaticity of output light beams can be maintained.
Description
Technical field
The present invention relates to projection art, particularly relate to and a kind ofly utilize the projection light source of fluorescent powder color wheel and apply the projection arrangement of this projection light source.
Background technology
Along with computer peripheral moves towards mobile gradually, projector apparatus also towards lightweight development, is taken advantage of a situation and has been expedited the emergence of minitype projection machine.Minitype projection machine is mainly integrated with mobile device, is embedded on the devices such as mobile phone, digital camera, panel computer, and by the cell powers of mobile device, can realize carrying with truly.
And UHP (Ultra High Power, the ultra high power) light source that current common projector is conventional, due to aspects such as volume, power consumption, heat radiations, cannot be applied on minitype projection machine, therefore need exploitation micro projection light source to coordinate with it.
Compared with traditional UHP light source, micro projection light source has higher requirement in volume, serviceable life, power consumption and heating, color etc.Wherein a kind of projection light source utilizes LD (Laser Diode, laser diode) or LED (Light Emitting Diode, light emitting diode) as excitation source, to focus on fluorescent powder color wheel excitated fluorescent powder by the exciting light sent by excitation source luminous, and the color sequence of light producing periodic timing along with the rotation of fluorescent powder color wheel is used as projection light source uses.
Current fluorescent powder color wheel mainly comprises reflective fluorescent powder color wheel and transmission-type fluorescent powder color wheel two kinds of forms.Such as China's No. 201010567422.9 patented claim, discloses structure and the use-pattern of these two kinds of fluorescent powder color wheels.
Referring to Fig. 1, is a kind of structural representation adopting the projection light source of transmission-type fluorescent powder color wheel in prior art.Projection light source 40 comprises fluorescent powder color wheel 41, rotating shaft 42, collector lens 44 and excitation source 45.Fluorescent powder color wheel 41 is generally make formation by exciting the fluorescent powder subregion of different wavelengths of light to be coated on transparent glass.The exciting light that LASER Light Source 45 sends is focused on fluorescent powder color wheel 41 by collector lens 44, form hot spot 43, along with rotating shaft 42 drives fluorescent powder color wheel 41 42 to rotate around the shaft, hot spot 43 also carries out scanning to fluorescent powder color wheel 41 and irradiates, absorbed exciting light by the fluorescent powder of hot spot 43 irradiation area, be converted into corresponding utilizing emitted light and transmit fluorescent powder color wheel 41 and form projected light beam.
Due to the utilizing emitted light only changed by fluorescent powder color wheel that projection light source 40 sends, therefore, for the projection light source 40 adopting fluorescent powder color wheel, the luminescence efficiency of fluorescent powder and conversion efficiency become the key factor affecting projection light source.Research shows, along with temperature rises, the quantum efficiency of fluorescent powder can reduce, and cause fluorescent powder emergent light to reduce, radiation wavelength also can change, thus causes the change of colour temperature, colourity; On the other hand, higher temperature also can accelerate the aging of fluorescent powder.
And in prior art, the exciting light that LASER Light Source 45 sends normally is focused on fluorescent powder color wheel 41 with the form of a hot spot, this can form very strong optical radiation on the colour wheel region at hot spot 43 place, produce higher temperature, luminescence efficiency and the conversion efficiency of fluorescent powder can be reduced, and then the output optical efficiency of projection light source 40 is declined, colour temperature, the colourity of output beam change, and cause the image display effect of projector not good.
Therefore, need the projection arrangement a kind of projection light source being provided and applying this projection light source, with solve in prior art adopt fluorescent powder color wheel projection light source existing for above-mentioned technical matters.
Summary of the invention
The technical matters that the present invention mainly solves is to provide a kind of projection light source and applies the projection arrangement of this projection light source, to improve the output optical efficiency of projection light source, and keeps the colour temperature of output beam, the stability of colourity.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: provide a kind of projection light source, comprising: excitation source and can the colour wheel of periodic motion.Excitation source is for generation of exciting light.Colour wheel is arranged on the travel path of exciting light, and colour wheel comprises at least one light wavelength conversion region, light wavelength conversion area surface to excitation source to receive exciting light and then to be converted to corresponding stimulated luminescence.Wherein, during colour wheel periodic motion, the exciting light that excitation source produces forms hot spot on colour wheel, and the projection size of hot spot in colour wheel direction of motion is less than the projection size on other directions of at least one on colour wheel of spot projection.
For solving the problems of the technologies described above, another technical solution used in the present invention is: provide a kind of projection arrangement, projection arrangement comprises optical digital computing unit, projection lens and projection light source, projection light source produces the color sequence of light of periodic timing, and color sequence of light is projected optical digital computing unit, optical digital computing unit receives the picture signal being inputted projection arrangement by outside, picture signal is treated to the switch controlling signal of the binary data corresponding with color sequence of light, optical digital computing unit comprises array of reflective micro-mirrors further, switch controlling signal controls array of reflective micro-mirrors and reflects the color sequence of light that projection light source projects, to form the projection ray comprising image information, projection ray projects on screen and forms display image by projection lens.Described projection light source comprise for generation of exciting light excitation source and can the colour wheel of periodic motion; Described colour wheel comprises at least one light wavelength conversion region, to receive described exciting light and then to be converted to corresponding stimulated luminescence on the travel path that described light wavelength conversion region is arranged on exciting light; During wherein said colour wheel periodic motion, the exciting light that described excitation source produces forms hot spot on described colour wheel, and the projection size of described hot spot in colour wheel direction of motion is less than the projection size of described hot spot on the direction perpendicular with the direction of motion of colour wheel
The invention has the beneficial effects as follows: the situation being different from prior art, projection light source of the present invention is incident upon facula position on colour wheel and direction by adjustment exciting light, the dutycycle that fluorescent powder is excited can be reduced, thus improve the fluorescence efficiency of colour wheel, and reduce the temperature of spot area on colour wheel, improve the output optical efficiency of projection light source, keep the colour temperature of output beam, the stability of colourity.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation adopting the projection light source of transmission-type fluorescent powder color wheel in prior art;
Fig. 2 is the structural representation of the preferred embodiment of projection arrangement of the present invention;
Fig. 3 is the projected position design sketch of hot spot of the present invention on colour wheel;
Fig. 4 is the time of being excited of facula position and the graph of a relation of sweep time on colour wheel of the present invention;
Fig. 5 is the facula position schematic diagram along rotating shaft horizontal direction on colour wheel of the present invention;
Fig. 6 is the facula position schematic diagram along rotating shaft vertical direction on colour wheel of the present invention;
Fig. 7 is the schematic diagram of the various projection of shape of hot spot on colour wheel of the present invention;
Fig. 8 is the structural representation of the another kind of embodiment of projection light source in projection arrangement of the present invention.
Fig. 9 is the structural representation of another embodiment of projection light source in projection arrangement of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Being easier to for making those skilled in the art understand technical scheme of the present invention, first the structure of projection arrangement of the present invention and principle of work being described.
Fig. 2 is the structural representation of the preferred embodiment of projection arrangement of the present invention.As shown in Figure 2, projection arrangement 10 of the present invention mainly comprises projection light source 110, optical digital computing unit 120 and projection lens 130.This color sequence of light for generation of the color sequence of light of periodic timing, and is projected optical digital computing unit 120 by projection light source 110.Optical digital computing unit 120 receives the picture signal of numeral or simulation, picture signal is treated to the switch controlling signal of the binary data corresponding with color sequence of light, the color sequence of light that projection light source 110 projects is reflected, to form the projection ray comprising image information by the array of reflective micro-mirrors in this switch controlling signal control figure optical processing unit 120.The projection ray comprising image information projects on screen 20 and forms display image by projection lens 130.
Projection light source 110 comprises excitation source 111, collector lens 112, colour wheel 113, shaping lens 114 and motor (not shown) further.In other embodiments of the present invention, excitation source can integrate with collector lens, namely on the exiting surface of excitation source, arranges collector lens, thus on excitation source, realize the function assembling emergent ray.Colour wheel and shaping lens can integrate, and namely on the exiting surface of colour wheel, arrange shaping lens thus realize adjusting the function comprising the shooting angle of the color sequence of light of stimulated luminescence.Therefore, projection light source comprises the function that excitation source and colour wheel just can realize the color sequence of light producing periodic timing.
Excitation source 111 sends can short wavelength's exciting light of excitated fluorescent powder luminescence, and excitation source 111 such as can adopt blue-ray LED, ultraviolet LED or its array, or blue light LD, ultraviolet LD or its array.
The exciting light that excitation source 111 sends converges on colour wheel 113 through collector lens 112.By arranging excitation source 111, position relationship between shaping lens 112 and this three of colour wheel 113, and parameter adjustment is carried out to shaping lens 112, the facula position of exciting light on colour wheel 113 and direction can be controlled, to make colour wheel 113, there is better luminescence efficiency and conversion efficiency.Detail the present invention will hereafter be further described in more detail, and no longer launch herein.
Colour wheel 113 comprises the shapes such as annular, circle and rectangle, the present embodiment is circular is example, comprise at least one light wavelength conversion region that at least part of region was uniformly distributed/was coated with optical wavelength conversion material, it is fixed in rotating shaft 1134, and by motor driving 1134 rotations around the shaft, colour wheel 113 is arranged on towards on the path of exciting light propagation, according to the difference of optical wavelength conversion material, light wavelength conversion region comprises fluorescent powder, quantum dot or fluorescent dye, or its mixing.The colour wheel 113 that lists only exemplary in Fig. 1 comprises red light wavelength transition zone 1131, green wavelength transition zone 1132, blue light wavelength transition zone 1133, in other embodiments of the present invention, colour wheel 113 can also comprise white light conversion district, yellow wavelengths transition zone etc.The exciting light that excitation source 111 sends is focused on colour wheel 113 through collector lens 112 and forms hot spot, exciting light is converted to the stimulated luminescence corresponding with optical wavelength conversion material by the optical wavelength conversion material of hot spot region, because facula position is relative with rotating shaft 1134 fixing, when rotating shaft 1134 drives colour wheel 113 to rotate, multiple around the shaft 1134 in angularly equally distributed light wavelength conversion region successively by hot spot irradiation position, exciting light is converted to corresponding stimulated luminescence by the optical wavelength conversion material in each light wavelength conversion region, stimulated luminescence transmits colour wheel 113 and is shaped lens 114 and receives.
Shaping lens 114 receives the color sequence of light comprising stimulated luminescence by colour wheel 113 outgoing, carries out beam shaping to it, the color sequence of light after shaping is projected on optical digital computing unit 120.
Motor (not shown) connection rotating shaft 1134, for driving colour wheel 113 (not shown) rotation around the shaft.
Optical digital computing unit 120 comprises the circuit board 121 of digital micro-mirror chip (Digital MicromirrorDevice, DMD) 124, processor 122, storer 123 and carrying said elements.
Digital micro-mirror chip 124 is bases of optical digital computing (Digital Light Processing, DLP) shadow casting technique, and digital micro-mirror chip 124 can be briefly described becomes a semiconductor optical switch.Thousands of individual small square eyeglass is built upon on the hinge arrangement above static random access memory (SRAM) and forms digital micro-mirror chip 124.Each eyeglass can the light of a break-make pixel.Hinge arrangement allows eyeglass to tilt between two states, and+10 degree are "ON".-10 degree are "Off", and when eyeglass does not work, they are in 0 degree of " berthing " state.
According to the needs of application, optical digital computing unit 120 can receive video or the figure signal of numeral or simulation.Video that is digital or that simulate or image signal processing are red, green, blue (RGB) data by processor 122, then RGB data are formatted as binarization plane data and write storer 123.
Digital micro-mirror chip 124 reads the binarization plane data in storer 123, each pixel of image information is mapped directly on the eyeglass of digital micro-mirror chip 124 according to the ratio of 1: 1, thus exact figure can be provided to control to digital micromirror chip 124.
Addressing is carried out with binarization plane signal by the storage unit under each eyeglass to digital micromirror chip 124, each eyeglass on digital micro-mirror chip 124 tilts for "ON" or "Off" state for electrostatically, processor 122 can control each lens tilt in which direction and how long keep by pulse-length modulation (PWM), and digital micro-mirror chip 124 becomes a controlled optical reflection array thus.From the color sequence of light light beam of shaping lens 114 by direct irradiation at digital micro-mirror chip surface.
When colour wheel 113 rotates, the color sequence of light light beam of red, green, blue is sequentially penetrated on digital micro-mirror chip 124, when ruddiness is mapped on digital micro-mirror chip 124, the position that eyeglass should show according to red information and intensity tilt to "ON", green and blue light and picture signal are also work like this, projected on screen 20 by the light beam that digital micro-mirror chip 124 reflects by projection lens 130, human vision system is concentrated the red, green, blue information on screen 20 and is seen a full-color image.
The foregoing describe structure and the principle of work of projection arrangement of the present invention, below by the light spot shape of exciting light on colour wheel and be described in detail the impact that luminescence efficiency and the conversion efficiency of colour wheel cause.
In projection optical system, all there is requirement for the shape of hot spot and size being irradiated to digital micro-mirror chip surface.The size of the hot spot of digital micro-mirror chip surface can be controlled by the enlargement factor of projection optical system, and the shape of the hot spot of digital micro-mirror chip surface is then identical with the light spot shape on colour wheel.Light wavelength conversion region on colour wheel can not change light spot shape, is therefore finally irradiated to the light spot shape almost identical with the light spot shape that excitation source incides on colour wheel (considering that the difference of projection optical system may slightly change) on digital micro-mirror chip.For improving the utilization ratio of the luminous energy of projection optical system, the mating shapes of the light spot shape needing excitation source to produce and digital micro-mirror chip, namely require that excitation source produces as far as possible close to the hot spot of digital micro-mirror chip form.Screen due to Projection Display has certain ratio specification, and such as 4: 3 or 16: 9, therefore digital micro-mirror chip is also length breadth ratio is 4: 3 or 16: 9 rectangles, and this just causes and excites the shape of hot spot size in length and wide both direction to be different.
Because the luminescence efficiency of colour wheel and the intensity of conversion efficiency stimulated luminescence and hot spot distribution influence are very large, different facula positions and projecting direction can cause different effects to the luminescence efficiency of colour wheel and conversion efficiency.Be easier to for making those skilled in the art understand technical scheme of the present invention, the present invention is described with a kind of simple scenario now, namely be described with two diverse locations of same projected light beam on annular projection's track of the colour wheel hot spot formed that projects, in such cases, the acquiescence shape of two hot spots, size, light distribution are all identical, to simplify the parameter needing to compare.It will be appreciated by those skilled in the art that above-mentioned restriction is just in order to illustrate technical scheme of the present invention, not for limiting embodiments of the present invention.
Fig. 3 is the projected position design sketch of hot spot of the present invention on colour wheel.As shown in Figure 3, colour wheel 210 is provided with twisted rotary shaft 220 in angularly equally distributed fluorescence transition zone 211,212,213, light wavelength conversion district 211,212,213 is provided with different material for transformation of wave length, such as fluorescent material or nano wave length transition material (front and back statement contradiction, advise that fluorescence transition zone in front changes light wavelength conversion district into), exciting light can be converted to the Stimulated Light with exciting light different wave length respectively.Specifically, for fluorescent material, light wavelength conversion district 211 is for being provided with the ruddiness subregion of red light flourescent material, light wavelength conversion district 212 is for being provided with the green glow subregion of green-emitting fluorescent material, light wavelength conversion district 213 is for being provided with the blue light subregion of blue-light fluorescent material, exciting light can be converted to ruddiness by light wavelength conversion district 211, and light wavelength conversion district 212 can convert exciting light to green glow, and 213, light wavelength conversion district converts exciting light to blue light.Therefore, when on the travel path being arranged at exciting light under the effect at motor (not shown) or other driving mechanisms of the light wavelength conversion district 211,212,213 of colour wheel 210 in turn, colour wheel 210 can the periodic sequence of colored lights that is made up of ruddiness, green glow, blue light in turn of outgoing.
The exciting light that light source (not shown) sends is focused on colour wheel 210 through collector lens and forms hot spot 230 or 240, when rotating shaft 220 drives colour wheel 210 to rotate, the center of hot spot 230 or 240 forms annular projection's track 214 along the circumferential direction on colour wheel 210.Hot spot 230 and hot spot 240 represent that two diverse locations of same projected light beam on annular projection's track 214 of colour wheel project the hot spot formed, and hot spot 230 is all identical with shape, size, the light distribution of 240, in the present embodiment, hot spot 230 and 240 is rectangular light spot, the length of rectangular light spot is d1, and width is d2.On the axle center radial line in the horizontal direction that wherein hot spot 230 is positioned at colour wheel, on the radial line vertically of the axle center that hot spot 240 is positioned at colour wheel.By changing the relative position relation of light source and colour wheel 210, the projected position of hot spot on colour wheel 210 can be adjusted, and the size of the hot spot of different projected position on annular projection's track 214 is also different.
As shown in Figure 3, the projected light beam that the exciting light that light source sends is formed on colour wheel 210 formed hot spot 230 and 240 the radial direction of rotating shaft 220 and circumferencial direction projection size in other words, the projection size etc. of projected light beam on colour wheel 210 annular projection's track 214 along the circumferential direction.Wherein hot spot 230 is at the projection size hot spot 230 in the radial direction of rotating shaft at the projection size circumferentially of rotating shaft, and hot spot 240 is then less than the projection size circumferentially of hot spot 230 in rotating shaft at the projection size in the radial direction of rotating shaft.
For the fluorescent powder of local some on colour wheel 210, it rotates and just can be excited once by hot spot in one week, the time excited each time, is the time of the inswept hot spot of this localized fluorescence powder.Hot spot size on annular projection's track 214 is along the circumferential direction longer, and this localized fluorescence pruinescence excites light-struck time longer, and the accumulation of the heat produced in fluorescent powder inside is more, and the efficiency of fluorescent powder is lower.Visible, the size of hot spot on annular projection's track 214 along the circumferential direction should be as far as possible little.
Fig. 4 is the time of being excited of facula position and the graph of a relation of sweep time on colour wheel of the present invention.The exciting light that light source sends incides on colour wheel 210, and the material for transformation of wave length on facula position excites generation exciting light by incident light.Because incident light is lasting light, as colour wheel 210 does not rotate, then the incident light of the fluorescence transition zone be stimulated is lasting light, when normally working under the effect of colour wheel 210 at motor or other driving mechanisms, when getting up with fixing rotational speed, then incident on facula position light is pulse.As shown in Figure 4, due to the invariablenes turning speed of colour wheel 210, time of the being excited t of the material for transformation of wave length so on facula position is less with the dutycycle of T-phase ratio sweep time, then the heated time of fluorescent powder is shorter, the accumulation of the heat that fluorescent powder inside produces is fewer, and the fluorescence efficiency of colour wheel 210 is higher.Shown in composition graphs 3, the material for transformation of wave length of facula position is subject to exciting light-struck dutycycle be: d/2 π r.Wherein, d is the arc length of hot spot on annular projection's track 214, and the radian corresponding to hot spot is very little, and therefore this arc length can be approximately equal to the circumferentially size of hot spot in rotating shaft.R is the distance of hot spot to colour wheel rotation axis.Wherein, the length d1 of rectangle and width d2 is certain value, and hot spot is also certain value to the distance r of the rotating shaft 220 of colour wheel 210.
For Fig. 5 and Fig. 6, the fluorescence efficiency of different hot spot is described now.Fig. 5 is the facula position schematic diagram along rotating shaft horizontal direction on colour wheel of the present invention.Fig. 6 is the facula position schematic diagram along rotating shaft vertical direction on colour wheel of the present invention.The size of facula position 330 and facula position 430 is 1.4 millimeters of x1.8 millimeters, when on the radial line in the horizontal direction of the axle center 320 that the relative position of the light source 350 with colour wheel 310 that arrange incident exciting light makes hot spot 330 be positioned at colour wheel 310, d1=1.4 millimeter, when on the radial line vertically of the axle center 420 that the relative position of the light source 450 with colour wheel 410 that arrange incident exciting light makes hot spot 430 be positioned at colour wheel 410, d2=1.8 millimeter, because radius r is certain value, then the dutycycle of facula position 330 and facula position 430 is d1/d2=1.4/1.8=0.78, then the fluorescence efficiency of facula position 330 is 1.29 times of facula position 430.
Can reach a conclusion thus, the fluorescence efficiency of hot spot is higher when the projection size in the radial direction of rotating shaft is greater than the projection size circumferentially of hot spot in described rotating shaft at hot spot, and the fluorescence efficiency of hot spot is higher when the projection size in the radial direction of rotating shaft is greater than the projection size of hot spot on the direction perpendicular with the radial direction of rotating shaft at hot spot in other words.When designing projection light source, by adjustment light source and the relative position of colour wheel, make the projection hot spot of incident light shorter drop on colour wheel rotating shaft circumferentially, the fluorescence efficiency of projection light source can be improved.
Above are only a preferred implementation of projection light source of the present invention, in practical application, can adjust as the case may be, still for the colour wheel moved in a circle, when being projected in, colour wheel spot size is circumferentially larger, then fluorescence efficiency is lower; When being projected in colour wheel spot size circumferentially and being greater than the spot projection size in other any directions on colour wheel, hot spot efficiency is minimum; So, in order to improve fluorescence efficiency, at least to accomplish that the spot size be circumferentially projected on colour wheel is less than the size at least one other direction of being projected on colour wheel.
Fig. 7 is the schematic diagram of the various projection of shape of hot spot on colour wheel of the present invention.Those skilled in the art should know, and by the impact of light source and collector lens and the relative position relation with colour wheel, the projection of hot spot on colour wheel can comprise various shape, and the present invention does not limit this.As shown in Figure 7, the shape of hot spot is the closed figures mutually connected and composed from beginning to end by arc border and/or straight border.The figure be made up of arc border comprises ellipse, fillet polygon, avette, round rectangle, Long Circle etc.; The figure be made up of straight border comprises convex polygon, concave polygon, and convex polygon is as rectangle, trapezoidal, rhombus, parallelogram, not parallel quadrilateral, pentagon and hexagon etc., and concave polygon is as cruciform etc.
With the hot spot of exciting light on colour wheel for ellipse, when the spot projection of ellipse is in disc or circular colour wheel, when the major axis of the ellipse of hot spot is projected in colour wheel in the radial direction, when then oval minor axis is projected in direction of motion perpendicular with radial direction on colour wheel, the dutycycle of time of being excited compared with sweep time of the material for transformation of wave length on facula position is minimum, the heated time of fluorescent powder is short, the accumulation of the heat that fluorescent powder inside produces is just few, and the fluorescence efficiency of colour wheel is high.
Fig. 8 is the structural representation of the another kind of embodiment of projection light source in projection arrangement of the present invention.In the present embodiment, projection light source 500 comprises light source 550, colour wheel 510 and motor (not shown).In the present embodiment, by arranging collector lens on the exiting surface of light source 550, emergent light is directly focused on colour wheel 510 and forms hot spot 530, thus on light source 550, realize the function assembling emergent ray.
Fig. 9 is the structural representation of the another kind of embodiment of projection light source in projection arrangement of the present invention.In the present embodiment, projection light source 600 comprises colour wheel 610, rotating shaft 620, shaping lens 630, is instead popular in green optical filter 641, anti-indigo plant reveals the green optical filter 642, exciting light sources 651, red-light source 652 and blue light source 653.In the present embodiment, colour wheel 610 is provided with a kind of material for transformation of wave length, it is such as green light fluorescent powder, the green light fluorescent powder of the exciting light that exciting light sources 651 sends on colour wheel 610 absorbs and is converted to green glow, and collimate as green glow parallel beam via shaping lens 630, anti-green optical filter 641 and the anti-indigo plant of being popular in reveals the green on the transmission path being arranged on green glow parallel beam that optical filter 642 tilts, the transmission path of the relative green glow parallel beam of light direction of red-light source 652 is vertically arranged, and the ruddiness of red-light source 652 outgoing transmits along the direction being parallel to green glow parallel beam through counter being popular in after green optical filter 641 reflects, similar, the transmission path of the relative green glow parallel beam of light direction of blue light source 653 is vertically arranged, and the blue light of blue light source 653 outgoing reveals the green after optical filter 642 reflects through anti-indigo plant and transmits along the direction being parallel to green glow parallel beam.Present embodiments provide for exciting light sources and be applied in technical scheme on the colour wheel comprising single wavelength transition material, those skilled in the art should know, and the present invention limits the kind of the material for transformation of wave length that colour wheel in projection light source is arranged and quantity; Such as, colour wheel is established red light wavelength transition material, green wavelength transition material, blue light wavelength transition material, be incident upon on colour wheel by exciting light and be inspired ruddiness, green glow and blue light successively, after above-mentioned three coloured light mixed lights, send white light.Exciting light is incident upon the light spot shape on single colour wheel, as long as meet spot projection to be less than size at least one other direction of being projected on colour wheel in the spot size circumferentially of colour wheel, just can improve the fluorescence efficiency of colour wheel.
Colour wheel in aforementioned embodiments is circle or annular, moves under the driving of driving mechanism around center circumferential.Difference and aforementioned embodiments, colour wheel can also make the rectangle moved in the driving lower linear of driving mechanism.In this case, suppose that the stroke of colour wheel is L, hot spot projection size is in the movement direction d, and the material for transformation of wave length of facula position is subject to exciting light-struck dutycycle be: d/L; Dutycycle is less, then the heated time of fluorescent powder is shorter, and the accumulation of the heat that fluorescent powder inside produces is fewer, and the efficiency of fluorescent powder is higher.Namely the spot size be incident upon in colour wheel direction of motion is less, and the fluorescence efficiency of colour wheel is higher; So, in the plane at hot spot place, the hot spot size be in the movement direction projected on colour wheel is less than the fluorescence efficiency that the size being projected at least one other direction just can improve colour wheel, and the hot spot size in the movement direction be such as projected on colour wheel is less than the size be projected on the direction vertical with direction of motion; Be less than when being projected in the size in the movement direction of the hot spot on colour wheel the projection size being projected in other any hot spots be different from direction of motion on colour wheel, the fluorescence efficiency of colour wheel is the highest.
Concerning colour wheel be circular or discoidal embodiment, colour wheel is circular motion under the driving of drive unit, colour wheel vertical diameter to circumferencial direction i.e. its direction of motion; So also can be summarized as, in the plane at hot spot place, the hot spot size be in the movement direction projected on colour wheel is less than the fluorescence efficiency that the size be projected at least one other direction just can improve colour wheel, as the hot spot size be in the movement direction projected on colour wheel is less than the size be projected on the direction vertical with direction of motion; Be less than when being projected in the size in the movement direction of the hot spot on colour wheel the projection size being projected in other any hot spots be different from direction of motion on colour wheel, the fluorescence efficiency of colour wheel is the highest.
Comprehensive colour wheel circular motion and linear movement, in the plane at hot spot place, the hot spot size be in the movement direction projected on colour wheel is less than the fluorescence efficiency that the size be projected at least one other direction just can improve colour wheel; Be less than when being projected in the size in the movement direction of the hot spot on colour wheel the projection size being projected in other any hot spots be different from direction of motion on colour wheel, the fluorescence efficiency of colour wheel is the highest.
In the above-described embodiments, compared with prior art, projection light source of the present invention is incident upon facula position on colour wheel and direction by adjustment exciting light, makes the hot spot size be in the movement direction projected on colour wheel be less than the size be projected at least one other direction; Hot spot is diminished at the projection size of direction of motion, this localized fluorescence pruinescence excites light-struck time to shorten, the dutycycle that fluorescent powder is excited can be reduced, thus improve the fluorescence efficiency of colour wheel, and reduce the temperature of spot area on colour wheel, improve the output optical efficiency of projection light source, keep the colour temperature of output beam, the stability of colourity.
The foregoing is only embodiments of the invention; not thereby limit the scope of the invention; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (12)
1. a projection light source, comprising:
Excitation source, for generation of exciting light; And
Can the colour wheel of periodic motion, comprise at least one light wavelength conversion region, to receive described exciting light and then to be converted to the stimulated luminescence corresponding with this light wavelength conversion region on the travel path that described light wavelength conversion region is arranged on described exciting light;
During described colour wheel periodic motion, the exciting light that described excitation source produces forms hot spot on described colour wheel;
It is characterized in that, the projection size of described hot spot in colour wheel direction of motion is less than the projection size on other directions of at least one on colour wheel of spot projection.
2. projection light source according to claim 1, is characterized in that, the projection size of described hot spot in colour wheel direction of motion is less than the projection size on the direction perpendicular with colour wheel direction of motion with spot projection on colour wheel.
3. projection light source according to claim 1, is characterized in that, the projection size of described hot spot in colour wheel direction of motion is less than the projection size on described spot projection other any directions on colour wheel.
4. projection light source according to claim 1, is characterized in that, described light wavelength conversion region comprises fluorescent powder, quantum dot or fluorescent dye, or its mixing.
5. projection light source according to claim 1, is characterized in that, the shape of described hot spot is the closed figures mutually connected and composed from beginning to end by arc border and/or straight border.
6. projection light source according to claim 5, is characterized in that, the shape of described hot spot comprises convex polygon, concave polygon, ellipse, fillet polygon, one of avette.
7. projection light source according to claim 6, is characterized in that, described convex polygon comprises rectangle, trapezoidal, rhombus, parallelogram, not parallel quadrilateral, one of pentagon and hexagon.
8. projection light source according to claim 1, is characterized in that, described colour wheel is can the circle of circular motion or annular.
9. projection light source according to claim 8, is characterized in that, the shape of described hot spot is oval, and oval major axis is projected in colour wheel in the radial direction, and oval minor axis is projected in the direction of motion of vertical colour wheel radial direction.
10. projection light source according to claim 8, is characterized in that, the shape of described hot spot is rectangle, and rectangular long limit is projected in colour wheel in the radial direction, and rectangular broadside is projected in the direction of motion of vertical colour wheel radial direction.
11. projection light sources according to claim 8, is characterized in that, described projection light source also comprises:
Motor, connects described rotating shaft, for driving described colour wheel around described axis of rotation.
12. 1 kinds of projection arrangements, it is characterized in that, described projection arrangement comprises optical digital computing unit, projection lens and projection light source according to any one of claim 1 to 10, described projection light source produces the color sequence of light of periodic timing, and described color sequence of light is projected described optical digital computing unit, described optical digital computing unit receives the picture signal being inputted described projector by outside, described picture signal is treated to the switch controlling signal of the binary data corresponding with described color sequence of light, described optical digital computing unit comprises array of reflective micro-mirrors further, described switch controlling signal controls described array of reflective micro-mirrors and reflects the described color sequence of light that described projection light source projects, to form the projection ray comprising image information, described projection ray projects on screen and forms display image by described projection lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510256051.5A CN104865784B (en) | 2011-10-26 | 2011-10-26 | Projection light source and projector employing same |
| CN201110329788.7A CN103076712B (en) | 2011-10-26 | 2011-10-26 | Projection light source and projection device using same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110329788.7A CN103076712B (en) | 2011-10-26 | 2011-10-26 | Projection light source and projection device using same |
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| CN201510256051.5A Division CN104865784B (en) | 2011-10-26 | 2011-10-26 | Projection light source and projector employing same |
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| CN201510256051.5A Active CN104865784B (en) | 2011-10-26 | 2011-10-26 | Projection light source and projector employing same |
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| CN105227942B (en) * | 2015-08-27 | 2018-09-25 | 广东威创视讯科技股份有限公司 | System is arranged in a kind of projector's colour temperature setting method and colour temperature |
| CN106200234B (en) * | 2016-07-01 | 2017-11-03 | 广州柏睿光电科技有限公司 | A kind of colour wheel with stereochemical structure |
| WO2019035307A1 (en) * | 2017-08-17 | 2019-02-21 | ソニー株式会社 | Light source device and projection type display device |
| CN109581792B (en) | 2017-09-29 | 2021-04-02 | 中强光电股份有限公司 | Wavelength conversion wheel and projector |
| CN107632488A (en) * | 2017-10-31 | 2018-01-26 | 广景视睿科技（深圳）有限公司 | A kind of fluorescence colour wheel excitation apparatus and its projection module |
| US10416547B2 (en) * | 2017-11-22 | 2019-09-17 | Texas Instruments Incorporated | Assymetric spot area spoke reduction |
| CN109991800B (en) * | 2018-01-03 | 2022-11-11 | 深圳光峰科技股份有限公司 | Light source device and projection system |
| JP6987347B2 (en) * | 2018-03-29 | 2021-12-22 | マクセル株式会社 | projector |
| CN110928122A (en) * | 2018-09-20 | 2020-03-27 | 深圳光峰科技股份有限公司 | Light source system and display device |
| CN111208698B (en) * | 2018-11-22 | 2020-11-10 | 无锡视美乐激光显示科技有限公司 | Wavelength conversion device and light source system |
| JP7361345B2 (en) * | 2019-04-24 | 2023-10-16 | パナソニックＩｐマネジメント株式会社 | Light-emitting device, medical system using the same, electronic equipment, and testing method |
| JP2020204652A (en) * | 2019-06-14 | 2020-12-24 | 株式会社ライトショー・テクノロジー | Light source device and projection type display device |
| CN111147139A (en) * | 2019-12-24 | 2020-05-12 | 广东省半导体产业技术研究院 | Remote control unmanned submersible, underwater visible light communication system and underwater visible light communication automatic alignment method |
| CN111679544B (en) * | 2020-07-01 | 2021-08-10 | 无锡视美乐激光显示科技有限公司 | Light source device and optical system |
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Also Published As
| Publication number | Publication date |
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| CN104865784B (en) | 2017-01-18 |
| CN103076712A (en) | 2013-05-01 |
| CN104865784A (en) | 2015-08-26 |
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