CN102929083A - Projection device and method for regulating color wheel delay time of projection device - Google Patents
Projection device and method for regulating color wheel delay time of projection device Download PDFInfo
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- CN102929083A CN102929083A CN2011102297837A CN201110229783A CN102929083A CN 102929083 A CN102929083 A CN 102929083A CN 2011102297837 A CN2011102297837 A CN 2011102297837A CN 201110229783 A CN201110229783 A CN 201110229783A CN 102929083 A CN102929083 A CN 102929083A
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Abstract
The invention provides a projection device and a method for regulating the color wheel delay time of the projection device. The projection device comprises a light source, a color wheel, a first detection unit, a light modulation unit and a second detection unit, wherein color segments of the color wheel are periodically arranged on an emergent light path of the light source in turn, so that the color segments of preset colors of the color wheel generate light pulses in the preset colors under the action of the light source; the first detection unit detects the position of the color wheel, and generates a plurality of synchronous pulses of which the period of motion is the same as that of the color wheel; the light modulation unit acquires an image signal, generates a plurality of groups of modulating pulses according to the image signal, the synchronous pulses and a plurality of color wheel delay time candidates, and modulates the light pulses in the preset colors according to the modulating pulses; the second detection unit detects luminous fluxes of the light pulses modulated by the light modulation unit respectively; and the light modulation unit determines optimal color wheel delay time according to the luminous fluxes. In such a way, the color wheel delay time can be automatically regulated.
Description
Technical field
The present invention relates to the shadow casting technique field, particularly relate to the method for adjustment of a kind of projection arrangement and color wheel delay time thereof.
Background technology
At present, projection arrangement is widely used in the various application scenarios such as film broadcast, meeting and publicity.As everyone knows, in the use of projection arrangement, colour wheel and light-modulating cell need to carry out synchronously.Generally be by probe unit the mark that is arranged on colour wheel or the colour wheel CD-ROM drive motor to be surveyed, and after detecting this mark, produce a synchronizing pulse at every turn, and then periodically produce a plurality of synchronizing pulses identical with the colour wheel period of motion.Corresponding modulation is carried out in the colorama pulse that light-modulating cell then produces colour wheel after receiving this synchronizing pulse.Yet can't there be error in this detection method with avoiding, therefore need to proofread and correct to this synchronizing pulse the precise synchronization that (delay) could realize colour wheel and light-modulating cell.This trimming process is called as the color wheel delay time employed time delay.
For the projection arrangement of finishing assembling, in a single day its color wheel delay time determined, change with regard to not needing again.Yet, because the impact of the factors such as performance change of the shift in position of colour wheel or light source and detector may cause synchronous colour wheel and light-modulating cell again to occur asynchronous.At this moment, need to adjust time delay colour wheel, so that colour wheel and light-modulating cell re-synchronization.Therefore in the prior art, the adjustment of this color wheel delay time is to finish manually, has time-consuming, effort and adjusts the problems such as precision is relatively poor.
Along with the competition of projection arrangement industry is day by day violent, manufacturer improves the projection arrangement quality one after another, and then promotes the competitive power of self.The inventor finds in actively seeking for a long time to improve the process of projection arrangement quality, and the projection arrangement ubiquity can't robotization be adjusted the technical matters of color wheel delay time in the prior art.
Therefore, need to provide the method for adjustment of a kind of projection arrangement and color wheel delay time thereof, to solve the technical matters of can't robotization adjusting the color wheel delay time of projection arrangement in the prior art.
Summary of the invention
The technical matters that the present invention mainly solves provides the method for adjustment of a kind of projection arrangement and color wheel delay time thereof, adjusts the color wheel delay time of projection arrangement with robotization.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of projection arrangement is provided, comprises light source, colour wheel, the first probe unit, light-modulating cell and the second probe unit.Light source has one and goes out light path.Colour wheel comprises at least two look sections, and of all kinds section is arranged at out on the light path in turn and periodically, so that the look section of the predetermined color of colour wheel produces the light pulse of predetermined color under the effect of light source.The first probe unit is surveyed the position of colour wheel, and the generation a plurality of synchronizing pulses identical with the colour wheel period of motion.Light-modulating cell obtains picture signal, produces to organize modulating pulse according to picture signal, a plurality of synchronizing pulse and a plurality of candidate's color wheel delay time more, and respectively the light pulse of predetermined color is modulated according to the modulating pulse of many groups.Picture signal shows the signal of predetermined image for the light pulse that can utilize predetermined color.The second probe unit is surveyed respectively the luminous flux of the light pulse of the predetermined color after the light-modulating cell modulation.Light-modulating cell is further determined best colour wheel time delay according to luminous flux.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: the method for adjustment that a kind of color wheel delay time of projection arrangement is provided, comprise: at least two look sections of control colour wheel are arranged at going out on the light path of light source in turn and periodically, and the position of detection colour wheel, producing a plurality of synchronizing pulses identical with the colour wheel period of motion, and control the look section of the predetermined color of colour wheel produces predetermined color under the effect of light source light pulse; Show that according to the light pulse that can utilize predetermined color the picture signal of predetermined image, a plurality of synchronizing pulse and a plurality of candidate's color wheel delay time produce the modulating pulse of many groups, respectively the light pulse of predetermined color is modulated according to the modulating pulse of many groups, and survey respectively the luminous flux of light pulse of the predetermined color after modulation, and determine best colour wheel time delay according to luminous flux.
The invention has the beneficial effects as follows: the situation that is different from prior art, the method of adjustment of projection arrangement of the present invention and color wheel delay time thereof produces the modulating pulse of many groups according to picture signal, a plurality of synchronizing pulse and a plurality of candidate's color wheel delay time, according to the modulating pulse of many groups the light pulse of predetermined color is modulated, and survey respectively the luminous flux of the light pulse of this predetermined color, and determine best colour wheel time delay according to the luminous flux that detects.Therefore, projection arrangement of the present invention and color wheel delay time adjusting method thereof can robotization realize, and have save time, laborsaving and adjust the precision advantages of higher.
Description of drawings
Fig. 1 is the structural representation of a preferred embodiment of projection arrangement of the present invention;
Fig. 2 is the sequential chart of the various signals of projection arrangement shown in Figure 1;
Fig. 3 is the process flow diagram of a preferred embodiment of method of adjustment of the color wheel delay time of projection arrangement of the present invention;
Fig. 4 is the process flow diagram of concrete methods of realizing of step S02 of the method for adjustment of color wheel delay time shown in Figure 3.
Embodiment
See also Fig. 1, Fig. 1 is the structural representation of a preferred embodiment of projection arrangement of the present invention.As shown in Figure 1, projection arrangement 10 of the present invention mainly comprises light source 11, shaping lens 12, colour wheel 13, the first probe unit 14, relay lens 15, prism 16, light-modulating cell 17, the second probe unit 18 and camera lens 19.
Further, at least two look sections of this on the colour wheel 13 can be arranged at going out on the light path of light source 11 in turn and periodically under the effect of motor (not shown) or other driving mechanisms.In the present embodiment, colour wheel 13 can be around a rotating shaft periodic rotary, and then so that of all kinds section of colour wheel 13 is arranged at going out on the light path of light source 11 in turn and periodically.In other embodiments, colour wheel 13 can also be taked other designs, for example the disclosed rotary drum of Chinese patent CN200910105822.5 and moving belt.
Of all kinds section at colour wheel 13 is arranged in the process that light path of light source 11 in turn and periodically, and the position of 14 pairs of colour wheels 13 of the first probe unit is surveyed, and produces a plurality of synchronizing pulses as shown in Figure 2.For example, the first probe unit 14 can be surveyed the mark that is attached in colour wheel 13 or the CD-ROM drive motor rotating shaft, and produces a synchronizing pulse after detecting this mark at every turn, and then produces a plurality of synchronizing pulses.The cycle of these a plurality of synchronizing pulses is identical with the running period of colour wheel 13.
In order to realize the purpose of robotization adjustment color wheel delay time of the present invention, the synchronizing pulse that the first probe unit 14 produces is input to light source 11, so that the look section of the predetermined color of colour wheel 12 produces a plurality of light pulses of predetermined color under the effect of light source 11.The cycle of these a plurality of light pulses is also identical with the running period of colour wheel 13.In the present embodiment, light source 11 the look section of this predetermined color of determining colour wheel 13 according to synchronizing pulse be arranged at light source 11 go out on the light path time produce an illumination light pulse, so that this illumination light pulse forms the light pulse of predetermined color after the look section effect of this predetermined color, and then periodically be arranged at a plurality of light pulses that produce predetermined color in the process that light path of light source 11 in the look section of this predetermined color.
In the present embodiment, because light source 11 is semiconductor laser light resource, it has the function of High Speed Modulation, therefore in time rapidly switch or adjustment brightness.Therefore, the present embodiment produces the illumination light pulse by the opening and closing of control light source 11.Wherein, the light source 11 look section that receives time of synchronizing pulse and this predetermined color moves between time that light path of light source 11 and has the first fixed delay time.This first fixed delay time can be stored in the storage unit (not shown) of light source 11.Simultaneously, the look section that light source 11 receives time of synchronizing pulse and this predetermined color shifts out between time that light path of light source 11 and has the second fixed delay time, and is stored in equally this storage unit.The first fixed delay time and the second fixed delay time can be determined by the rotating speed of position, angle and the colour wheel 13 of the look section of this predetermined color, and can obtain by calculating.Therefore, the time that goes out light path that light source 11 is determined this predetermined color according to the first fixed delay time and second fixed delay time of this memory cell storage after receiving synchronizing pulse look section moves into and shifts out light source 11, and the look section of this predetermined color move into light source 11 go out light path the time open, the look section of this predetermined color shift out light source 11 go out light path the time close.Thus, whenever the look section of this predetermined color be arranged at light source 11 go out on the light path time, light source 11 just produces an illumination light pulse, and this illumination light pulse converts the light pulse of a predetermined color to through the look section wavelength of this predetermined color, and then forms a plurality of light pulses of predetermined color as shown in Figure 2.
In a preferred embodiment, light source 11 the look section of this predetermined color cover fully light source 11 go out light path the time open, and the look section of this predetermined color partly shift out light source 11 go out light path the time close, so that the illumination light pulse that light source 11 produces acts in the look section of this predetermined color fully at the hot spot that colour wheel 13 produces, avoided other color of light that this hot spot produces when being applied to the look section of other colors on adjusting result's impact thus.
In other embodiments, can adjust according to synchronizing pulse the emitting brightness of light source 11, so that the look section of this predetermined color be arranged at light source 11 go out on the light path time light source 11 the emitting brightness look section that obviously is different from other colors be arranged at light source 11 go out on the light path time emitting brightness, and then produce equally above-mentioned illumination light pulse.
The predetermined color of indication can be one or more colors in the present embodiment.In addition, the opening and closing time by control light source 11 is so that all or part of to the look section of this predetermined color of illumination light pulse action.Certainly, those skilled in the art can expect obtaining by other means the light pulse of this predetermined color fully, one optical filter (not shown) for example is set between colour wheel 13 and light-modulating cell 17, the light of this this predetermined color of optical filter transmission also (for example stops, absorb or reflection) light of other colors, and then can obtain equally the light pulse of predetermined color.
A plurality of light pulses of this predetermined color are incided light-modulating cell 17 via relay lens 15 and prism 16.Light-modulating cell 17 can be the various suitable optic modulating devices such as MEMS (micro electro mechanical system) (MEMS) and liquid crystal display (LCD or LCos).Comprise the pixel cell that a plurality of independences are controlled on the light-modulating cell 17, for example little galvanometer unit or liquid crystal cells, each pixel cell can be modulated the light through this pixel cell according to the modulating pulse of corresponding form, and its concrete modulation system is general knowledge known in this field, does not repeat them here.
In normal procedure for displaying, light source 11 produces periodic continuous multicolor light pulse sequence, red, green, blue, white for example ..., and light-modulating cell 17 is determined the time of arrival of versicolor light pulse by synchronizing pulse and color wheel delay time, and the light pulse that arrives modulated, form versicolor image in the upper periodicity of screen (indicating), and finally rely on the human eye combined color image.For example, light-modulating cell 17 obtains R, G, three kinds of picture signals of B successively, these three kinds of picture signals represent respectively the GTG value of the pixel that the different coordinate figures in the image of three kinds of colors of red, green, blue are corresponding, and for example the GTG value in the R picture signal 3 * 3 pixel region is as shown in table 1 below:
Table 1:
As above shown in the table 1, the row coordinate of X0-X2 presentation video wherein, the row-coordinate of Y0-Y2 presentation video, numerical value then represent the GTG value of the pixel that above-mentioned coordinate is corresponding.Light-modulating cell 17 produces one group of modulating pulse according to the above-mentioned GTG value of each pixel, and then controls respectively pixel cell corresponding with above-mentioned each pixel in the light-modulating cell 17 and move accordingly.For example, for MEMS (micro electro mechanical system), light-modulating cell 17 produces one group of modulating pulse according to the GTG value of each pixel in the above-mentioned picture signal, control is that little galvanometer unit corresponding to each pixel of 255 overturns 255 times with the GTG value thus, control is little galvanometer unit upset corresponding to each pixel of 200 200 times with the GTG value, and control and GTG value are that 20 little galvanometer unit corresponding to each pixel overturns 20 times etc.And then, can realize the different GTG values of each pixel on the image by the control to each pixel cell of light-modulating cell 17.
In the adjustment process of color wheel delay, light-modulating cell 17 obtains a picture signal, and this picture signal shows the signal of predetermined image for the light pulse that can utilize this predetermined color.For example, this picture signal is to utilize the light pulse of this predetermined color with the signal of the consistent monochrome image of maximum brightness full screen display brightness, and is as shown in table 2 below:
Table 2:
As above shown in the table 2, in above-mentioned picture signal, the GTG value of each pixel is 255.Certainly, those skilled in the art can adopt other forms of picture signal fully, the picture signal that example is as shown in table 1, and the present invention does not impose any restrictions this.
Light-modulating cell 17 produces the modulating pulse of many groups according to this picture signal, above-mentioned a plurality of synchronizing pulses and a plurality of candidate's color wheel delay time, and respectively a plurality of light pulses of this predetermined color is modulated according to this many groups modulating pulse.As mentioned, wherein every group of modulating pulse comprises respectively a plurality of modulating pulses, and each modulating pulse is used for a pixel cell of control light-modulating cell 17 light through this pixel cell is modulated.For example, each pixel cell of controlling in the light-modulating cell 17 according to the GTG value of each pixel in the above-mentioned picture signal moves accordingly.Wherein, when the picture signal shown in employing MEMS (micro electro mechanical system) and the table 2, light-modulating cell 17 its whole little galvanometers unit of control overturn respectively 255 times.
The second probe unit 18 is surveyed respectively the luminous flux of a plurality of light pulses after light-modulating cell 17 modulation of this predetermined color.Light-modulating cell 17 is determined best colour wheel time delay according to the luminous flux of the light pulse of predetermined color corresponding to each candidate's color wheel delay time.In the present embodiment, the second probe unit 18 can be arranged at the optional position on the subsequent optical path of light-modulating cell 17, for example, be arranged between the second probe unit 18 and the prism 16, between prism 16 and the camera lens 19, between camera lens 19 and the screen and on the screen, only need the second probe unit 18 can detect the luminous flux of the light pulse of this predetermined color after light-modulating cell 17 modulation, and after detecting this luminous flux, this luminous flux is fed back to light-modulating cell 17 and get final product.In addition, projection arrangement 10 can further include the optical filter (not shown) that is arranged at before the second probe unit 18, and the light of this this predetermined color of optical filter transmission also stops the light of other colors, and then improves the signal to noise ratio (S/N ratio) of the second probe unit 18.
In the present embodiment, light-modulating cell 17 further comprises storage unit (not shown).This one original color wheel delay time of cell stores.This original color wheel delay time can be the color wheel delay time of setting when assembling projection arrangement 10 or the color wheel delay time after the adjustment of process adjustment process last time.In this adjustment process, light-modulating cell 17 obtains the original color wheel delay time from storage unit, and by the original color wheel delay time is carried out increasing or decreasing, to form a plurality of candidate's color wheel delay times.For example, specifically, light-modulating cell 17 can obtain this original color wheel delay time as candidate's color wheel delay time from storage unit, and after receiving synchronizing pulse, postpone this original color wheel delay time and export this picture signal and the lasting schedule time, and then generation one group of modulating pulse as shown in Figure 2, modulate with the light pulse of 17 pairs of these predetermined colors that receive of control light-modulating cell.In Fig. 2, each pulse waveform of each lines all represents one group of modulating pulse, and this group modulating pulse is actual can to comprise a plurality of modulating pulses.For example, solid line represents to postpone three groups of suitable modulating pulses, the generation time that is every group of modulating pulse is synchronous with the generation time of corresponding light pulse respectively, article one, dotted line represents to postpone three groups of not enough modulating pulses, be that the generation time of every group of modulating pulse is early than the generation time of the light pulse of correspondence, and another dotted line represents to postpone three groups of excessive modulating pulses, i.e. the generation time of every group of modulating pulse is later than the generation time of corresponding light pulse.Those skilled in the art should understand that, above-mentioned three kinds of lines respectively the expression three groups of modulating pulses be not produced simultaneously, but constantly produce according to different candidate's color wheel delay time in difference, only be in order to show conveniently in Fig. 2, and with three kinds of stick figures together.In a preferred embodiment, it is identical with the duration of the light pulse of this predetermined color that each organizes duration of modulating pulse.
The second probe unit 18 is surveyed the luminous flux of the light pulse of the predetermined color after light-modulating cell 17 modulation, and records this luminous flux.Subsequently, with predetermined step-length this original color wheel delay time is progressively increased or successively decreases, to form new candidate's color wheel delay time, and after receiving another synchronizing pulse, postpone this new candidate's color wheel delay time and export this picture signal and continue the schedule time, produce another group modulating pulse, modulate with another light pulse of 17 pairs of these predetermined colors that receive of control light-modulating cell.The second probe unit 18 is surveyed the luminous flux of another light pulse of this predetermined color after light-modulating cell 17 modulation again, records this luminous flux.Subsequently, repeat said process, can obtain the luminous flux of a plurality of light pulses after modulation of this predetermined color.
In other embodiments, a plurality of candidate's color wheel delay times can generate in advance, and store in the storage unit.In the adjustment process of color wheel delay, light-modulating cell 17 is directly transferred these a plurality of candidate's color wheel delay times successively from storage unit.After obtaining candidate's color wheel delay time, light-modulating cell 17 is identical with normal procedure for displaying according to the specific implementation of picture signal, synchronizing pulse and the generation modulating pulse of candidate's color wheel delay time of the light pulse demonstration predetermined image that can utilize this predetermined color, and is techniques well known.
Because original color wheel delay time and correct differing of color wheel delay time can be greater than cycles of operation of colour wheel 13, therefore the temporal summation that increases progressively of the light-modulating cell 17 pairs of original color wheel delay time or the temporal summation of successively decreasing preferably are not more than a cycle of operation of colour wheel 17, and then guarantee to obtain the correct color wheel delay time.
In the present embodiment, as shown in Figure 2, if more synchronous between certain group modulating pulse that the light pulse of the predetermined color that colour wheel 13 produces and light-modulating cell 17 produce, then the luminous flux of the light pulse of the predetermined color after light-modulating cell 17 modulation can be higher, for example three groups of represented modulating pulses of solid line among Fig. 2.Therefore, corresponding candidate's color wheel delay time of light pulse of the predetermined color of light-modulating cell 17 selective light flux maximums is as best colour wheel time delay.The concrete deterministic process of light-modulating cell 17 will be described in detail hereinafter.
Obtaining best colour wheel after time delay, light-modulating cell 17 further stores best colour wheel into storage unit time delay, and replaces the original color wheel delay time.When projection arrangement 10 normal operation, light-modulating cell 17 utilizes this best colour wheel to cooperate synchronizing pulse to come the colorama pulse train that colour wheel 13 generates is modulated time delay.And this best colour wheel is further used as the original color wheel delay time in the adjustment process next time time delay.
Referring to Fig. 3, the process flow diagram of a preferred embodiment of the color wheel delay time adjusting method of Fig. 3 projection arrangement of the present invention.The method of adjustment of the color wheel delay time of projection arrangement of the present invention comprises:
In step S01, at least two look sections of control colour wheel 13 are arranged at going out on the light path of light source 11 in turn and periodically, and the position of detection colour wheel 13, to produce a plurality of synchronizing pulses identical with 13 periods of motion of colour wheel, control simultaneously the look section of the predetermined color of colour wheel 13 produces a plurality of predetermined colors under the effect of light source 11 light pulse.
In step S01, be arranged in the process that light path of light source 11 in turn and periodically at of all kinds section of colour wheel 13, utilize the position of 14 pairs of colour wheels 13 of the first probe unit to survey, and produce a plurality of synchronizing pulses as shown in Figure 2.For example, utilize the first probe unit 14 to survey the mark that is attached in colour wheel 13 or the CD-ROM drive motor rotating shaft, and after detecting this mark, produce a synchronizing pulse at every turn, and then produce a plurality of synchronizing pulses, and the cycle of these a plurality of synchronizing pulses is identical with the running period of colour wheel 13.
In addition, in step S01, the synchronizing pulse that the first probe unit 14 is produced is input to light source 11, a plurality of light pulses that under the effect of light source 11, produce predetermined color with the look section of predetermined color of control colour wheel 12, and the cycle of these a plurality of light pulses is identical with the running period of colour wheel 13.Specifically, the look section of this predetermined color of determining colour wheel 13 according to synchronizing pulse be arranged at light source 11 go out on the light path time control light source 11 produce an illumination light pulse, so that this illumination light pulse forms the light pulse of predetermined color after the look section effect of this predetermined color, and then periodically be arranged at a plurality of light pulses that produce predetermined color in the process that light path of light source 11 in the look section of this predetermined color.
In the present embodiment, because light source 11 is semiconductor laser light resource, it has the function of High Speed Modulation, therefore in time rapidly switch or adjustment brightness.Therefore, the present embodiment produces the illumination light pulse by the opening and closing of control light source 11.Wherein, the light source 11 look section that receives time of synchronizing pulse and this predetermined color moves between time that light path of light source 11 and has the first fixed delay time.This first fixed delay time can be stored in the storage unit (not shown) of light source 11.Simultaneously, the look section that light source 11 receives time of synchronizing pulse and this predetermined color shifts out between time that light path of light source 11 and has the second fixed delay time, and is stored in equally this storage unit.The first fixed delay time and the second fixed delay time can be determined by the rotating speed of position, angle and the colour wheel 13 of the look section of this predetermined color, and can obtain by calculating.Therefore, the time that goes out light path that the look section of determining this predetermined color according to the first fixed delay time and second fixed delay time of this memory cell storage after receiving synchronizing pulse moves into and shifts out light source 11, and go out light path time control light source 11 unlatchings processed what the look section of this predetermined color moved into light source 11, shift out the light path time control light source 11 processed that of light source 11 in the look section of this predetermined color and close.Thus, whenever the look section of this predetermined color be arranged at light source 11 go out on the light path time, light source 11 just produces an illumination light pulse, and this illumination light pulse converts the light pulse of a predetermined color to through the look section wavelength of this predetermined color, and then forms a plurality of light pulses of predetermined color as shown in Figure 2.
In a preferred embodiment, control light source 11 the look section of this predetermined color cover fully light source 11 go out light path the time open, and control light source 11 the look section of this predetermined color partly shift out light source 11 go out light path the time close, so that the illumination light pulse that light source 11 produces acts in the look section of this predetermined color fully at the hot spot that colour wheel 13 produces, avoided other color of light that this hot spot produces when being applied to the look section of other colors on adjusting result's impact thus.
In other embodiments, can adjust according to synchronizing pulse the emitting brightness of light source 11, so that the look section of this predetermined color be arranged at light source 11 go out on the light path time light source 11 the emitting brightness look section that obviously is different from other colors be arranged at light source 11 go out on the light path time emitting brightness, and then produce equally above-mentioned illumination light pulse.
The predetermined color of indication can be one or more colors in the present embodiment.In addition, the opening and closing time by control light source 11 is so that all or part of to the look section of this predetermined color of illumination light pulse action.Certainly, those skilled in the art can expect obtaining by other means the light pulse of this predetermined color fully, one optical filter (not shown) for example is set between colour wheel 13 and light-modulating cell 17, the light of this this predetermined color of optical filter transmission also (for example stops, absorb or reflection) light of other colors, and then can obtain equally the light pulse of this predetermined color.
In step S02, show that according to the light pulse that can utilize this predetermined color picture signal, these a plurality of synchronizing pulses and a plurality of candidate's color wheel delay time of predetermined image produce the modulating pulse of many groups, respectively a plurality of light pulses of this predetermined color are modulated according to this many groups modulating pulse, and survey respectively the luminous flux of a plurality of light pulses of this predetermined color after modulation, and determine best colour wheel time delay according to luminous flux.
Specifically, in step S02, control light-modulating cell 17 obtains a picture signal, and this picture signal shows the signal of predetermined image for the light pulse that can utilize this predetermined color.For example, this picture signal is that the as above light pulse that can control this predetermined color shown in the table 2 is with the signal of the consistent monochrome image of maximum brightness full screen display brightness.
Control light-modulating cell 17 produces the modulating pulse of many groups according to this picture signal, these a plurality of synchronizing pulses and a plurality of candidate's color wheel delay time, and respectively a plurality of light pulses of this predetermined color is modulated according to this many groups modulating pulse.As indicated above, wherein every group of modulating pulse comprises respectively a plurality of modulating pulses, and each modulating pulse is used for a pixel cell of control light-modulating cell 17 light through this pixel cell is modulated.For example, each pixel cell of controlling in the light-modulating cell 17 according to the GTG value of each pixel in the above-mentioned picture signal moves accordingly.Wherein, when the picture signal shown in employing MEMS (micro electro mechanical system) and the table 2, light-modulating cell 17 its whole little galvanometers of control overturn respectively 255 times.
Control the second probe unit 18 and survey respectively the luminous flux of a plurality of light pulses after light-modulating cell 17 modulation of this predetermined color.Further, control light-modulating cell 17 is determined best colour wheel time delay according to the luminous flux of the light pulse of predetermined color corresponding to each candidate's color wheel delay time.In the present embodiment, the second probe unit 18 can be arranged at the optional position on the subsequent optical path of light-modulating cell 17, for example, be arranged between the second probe unit 18 and the prism 16, between prism 16 and the camera lens 19, between camera lens 19 and the screen and on the screen, only need second probe unit 18 behind the luminous flux of the light pulse of the predetermined color after light-modulating cell 17 modulation, luminous flux to be fed back to light-modulating cell 17 and get final product detecting.In addition, optical filter (not shown) can also be set before the second probe unit 18 further, the light of this this predetermined color of optical filter transmission also stops the light of other colors, and then improves the signal to noise ratio (S/N ratio) of the second probe unit 18.
In the present embodiment, light-modulating cell 17 further comprises storage unit (not shown).This one original color wheel delay time of cell stores.This original color wheel delay time can be the color wheel delay time of setting when assembling projection arrangement 10 or the color wheel delay time after the adjustment of process adjustment process last time.In this adjustment process, control light-modulating cell 17 obtains the original color wheel delay time from storage unit, and by the original color wheel delay time is carried out increasing or decreasing, to form a plurality of candidate's color wheel delay times.Specifically, control light-modulating cell 17 obtains this original color wheel delay time from storage unit, and after light-modulating cell 17 receives synchronizing pulse, postpone this original color wheel delay time and export this picture signal and the lasting schedule time, and then generation one group of modulating pulse as shown in Figure 2, modulate with the light pulse of 17 pairs of predetermined colors that receive of control light-modulating cell.In Fig. 2, utilize a pulse pattern to represent one group of modulating pulse.In a preferred embodiment, the duration of this group modulating pulse is identical with the duration of the light pulse of this predetermined color.
Control the second probe unit 18 and survey the luminous flux of the light pulse of the predetermined color after light-modulating cell 17 modulation, and record this luminous flux.Subsequently, with predetermined step-length this original color wheel delay time is progressively increased or successively decreases, to form new candidate's color wheel delay time, and after receiving another synchronizing pulse, postpone this new candidate's color wheel delay time and export this picture signal and continue the schedule time, produce another group modulating pulse, modulate with another light pulse of 17 pairs of these predetermined colors that receive of control light-modulating cell.Control the second probe unit 18 and again survey the luminous flux of another light pulse of this predetermined color after light-modulating cell 17 modulation, record this luminous flux.Subsequently, repeat said process, can obtain the luminous flux of a plurality of light pulses after modulation of this predetermined color.
Because original color wheel delay time and correct differing of color wheel delay time can be greater than cycles of operation of colour wheel 13, therefore the temporal summation that increases progressively of the light-modulating cell 17 pairs of original color wheel delay time or the temporal summation of successively decreasing preferably are not more than a cycle of operation of colour wheel 17, and then guarantee to obtain the correct color wheel delay time.
In the present embodiment, as shown in Figure 2, if more synchronous between certain group modulating pulse that the light pulse of the predetermined color that colour wheel 13 produces and light-modulating cell 17 produce, then the luminous flux of the light pulse of the predetermined color after light-modulating cell 17 modulation can be higher.Therefore, in step S02, corresponding candidate's color wheel delay time of light pulse of the predetermined color of control light-modulating cell 17 selective light flux maximums is as best colour wheel time delay.The concrete deterministic process of light-modulating cell 17 will be described in detail hereinafter.
Obtaining best colour wheel after time delay, further control light-modulating cell 17 and store best colour wheel into storage unit time delay, and replace the original color wheel delay time.When projection arrangement 10 normal operation, light-modulating cell 17 utilizes this best colour wheel to cooperate synchronizing pulse to come the colorama pulse train that colour wheel 13 generates is modulated time delay.And this best colour wheel is further used as the original color wheel delay time in the adjustment process next time time delay.
Referring to Fig. 4, Fig. 4 is the process flow diagram of the concrete methods of realizing of step S02 shown in Figure 3.
In step S21, obtain the original color wheel delay time as candidate's color wheel delay time, and utilize the first variable t and the second variable t1 this original color wheel delay time of record.This original color wheel delay time can be in the color wheel delay time that assembling arranges during projection arrangement or through the color wheel delay time after last time, adjustment process was adjusted, and preferably is stored in the predetermined storage unit.
In step S22, produce one group of modulating pulse according to picture signal, synchronizing pulse and original color wheel delay time, to modulate with the light pulse to predetermined color, its concrete modulated process is as indicated above, does not repeat them here.
In step S23, survey the luminous flux of the light pulse of the predetermined color after step S22 modulation, and utilize ternary P0 to record this luminous flux.
In step S24, with predetermined step delta T the first variable t is increased progressively, obtaining new candidate's color wheel delay time, and produce one group of new modulating pulse according to picture signal, synchronizing pulse and this new candidate's color wheel delay time, modulate with the light pulse to predetermined color.Step S24 is identical with picture signal among the step S22.
In step S25, survey the luminous flux of the light pulse of the predetermined color after step S24 modulation, and utilize the 4th variable P1 to record this luminous flux.
In step S26, judge that whether the 4th variable P1 is less than ternary P0.If P1 less than P0, then enters step S28, if P1 greater than P0, then enters step S27.
In step S27, so that P0=P1, and utilize the second variable t1 to record the first variable t, and enter subsequently step S28.
In step S28, whether judge the first variable t less than threshold value T, if then enter step S24 less than threshold value T, and then repeating step S24-S27, otherwise enter step S29.In this step, threshold value T determines by the adjustment of original color wheel delay time and original color wheel delay time interval (temporal summation that the original color wheel delay time is increased progressively) is common.For example, threshold value T can equal the original color wheel delay time and adds the colour wheel cycle of operation.
In step S29, store the second variable t1 as best colour wheel time delay.
In the said method, by obtaining the original color wheel delay time and being increased progressively to obtain to comprise a plurality of candidate's color wheel delay times of original color wheel delay time the original color wheel delay time, and produce respectively one group of modulating pulse according to picture signal, synchronizing pulse and each candidate's color wheel delay time and come the light pulse of predetermined color is modulated, and survey the luminous flux of the light pulse of each predetermined color after modulation.Subsequently, candidate's color wheel delay time of selecting corresponding luminous flux maximum is as best colour wheel time delay.
It should be noted that also can be by successively decreasing to obtain a plurality of candidate's color wheel delay times in said method to the original color wheel delay time.Further, can also increase by a variable and come step delta T is added up in step S24, can compare this variable and another predetermined threshold this moment in step S28.At this moment, this another predetermined threshold is directly determined by the adjustment of original color wheel delay time is interval, is for example equaled the colour wheel cycle of operation.In addition, those skilled in the art can design other according to description above fully and concrete judge that flow processs determine best colour wheel time delay.
In said process, can also increase first (reducing) original color wheel delay time, if the luminous flux that detects increases, then continue to increase (reducing) original color wheel delay time, until reducing appears in luminous flux, then adjustment process finishes, and gets color wheel delay time corresponding to highlight flux as best colour wheel time delay.After reducing appears in luminous flux, also can reduce (increase) original time delay, finish again adjustment process after oppositely regulating.If luminous flux just reduces at the beginning, then reduce at once (increase) original time delay, oppositely regulate.
The method of adjustment of projection arrangement of the present invention and color wheel delay time thereof produces the modulating pulse of many groups according to picture signal, a plurality of synchronizing pulse and a plurality of candidate's color wheel delay time, according to the modulating pulse of many groups the light pulse of predetermined color is modulated, and survey respectively the luminous flux of the light pulse of this predetermined color, and determine best colour wheel time delay according to the luminous flux that detects.Therefore, projection arrangement of the present invention and color wheel delay time adjusting method thereof can robotization realize, and have save time, laborsaving and adjust the precision advantages of higher.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes instructions of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (20)
1. a projection arrangement is characterized in that, described projection arrangement comprises:
Light source, described light source have one and go out light path;
Colour wheel, described colour wheel comprise at least two look sections, and each described look section is arranged in turn and periodically and describedly goes out on the light path, so that the look section of the predetermined color of described colour wheel produces the light pulse of described predetermined color under the effect of described light source;
The first probe unit, for the position of surveying described colour wheel, and the generation a plurality of synchronizing pulses identical with the described colour wheel period of motion;
Light-modulating cell, be used for obtaining picture signal, produce to organize modulating pulses according to described picture signal, described a plurality of synchronizing pulses and a plurality of candidate's color wheel delay time more, and according to described many groups modulating pulse is modulated the light pulse of described predetermined color respectively, described picture signal shows the signal of predetermined image for the light pulse that can utilize described predetermined color;
The second probe unit, for the luminous flux of the light pulse of surveying respectively the described predetermined color after described light-modulating cell modulation,
Wherein, described light-modulating cell is further determined best colour wheel time delay according to described luminous flux.
2. projection arrangement according to claim 1, it is characterized in that, described the second probe unit is arranged on the subsequent optical path of described light-modulating cell, and behind the luminous flux of the light pulse that detects the described predetermined color after described light-modulating cell is modulated described luminous flux is fed back to described light-modulating cell.
3. projection arrangement according to claim 1 is characterized in that, described projection arrangement further comprises the optical filter that is arranged at before described the second probe unit, and the light of the described predetermined color of described optical filter transmission also stops the light of other colors.
4. projection arrangement according to claim 1 is characterized in that, described light-modulating cell selects corresponding described candidate's color wheel delay time of light pulse of described predetermined color of described luminous flux maximum as described best colour wheel time delay.
5. projection arrangement according to claim 1, it is characterized in that, described light source is arranged in the look section of determining described predetermined color according to described synchronizing pulse and describedly produces an illumination light pulse when going out on the light path, so that described illumination light pulse forms the light pulse of described predetermined color after the look section effect of described predetermined color.
6. projection arrangement according to claim 5 is characterized in that, described light source moves in the look section of described predetermined color and describedly opens when going out light path, and shifts out in the look section of described predetermined color and describedly to close when going out light path.
7. projection arrangement according to claim 6 is characterized in that, described light source covers fully in the look section of described predetermined color and describedly opens when going out light path, and partly shifts out in the look section of described predetermined color and describedly to close when going out light path.
8. projection arrangement according to claim 5 is characterized in that, described light source is semiconductor laser light resource.
9. projection arrangement according to claim 5 is characterized in that, the look section of described predetermined color converts described illumination light pulse wavelength to the light pulse of described predetermined color.
10. projection arrangement according to claim 1 is characterized in that, described projection arrangement comprises the optical filter that is arranged between described colour wheel and the described light-modulating cell, and the light of the described predetermined color of described optical filter transmission also stops the light of other colors.
11. projection arrangement according to claim 1, it is characterized in that, described light-modulating cell further comprises storage unit, the described one original color wheel delay time of cell stores, described light-modulating cell obtains the described original color wheel delay time and the described original color wheel delay time is carried out increasing or decreasing from described storage unit, to form described a plurality of candidate's color wheel delay time.
12. projection arrangement according to claim 11 is characterized in that, the temporal summation that described light-modulating cell increased progressively the described original color wheel delay time or the temporal summation of successively decreasing are not more than the cycle of operation of described colour wheel.
13. projection arrangement according to claim 11 is characterized in that, described light-modulating cell further stores described best colour wheel into described storage unit time delay, and replaces the described original color wheel delay time.
14. the method for adjustment of the color wheel delay time of a projection arrangement is characterized in that, described method of adjustment comprises:
At least two look sections of control colour wheel are arranged at going out on the light path of light source in turn and periodically, and survey the position of described colour wheel, producing a plurality of synchronizing pulses identical with the described colour wheel period of motion, and control the look section of the predetermined color of described colour wheel produces described predetermined color under the effect of described light source light pulse;
Show that according to the light pulse that can utilize described predetermined color the picture signal of predetermined image, described a plurality of synchronizing pulses and a plurality of candidate's color wheel delay time produce the modulating pulse of many groups, modulating pulse is modulated the described light pulse of described predetermined color respectively according to described many groups, and survey respectively the luminous flux of described light pulse of the described predetermined color after modulation, and determine best colour wheel time delay according to described luminous flux.
15. method of adjustment according to claim 14 is characterized in that, the look section of the predetermined color of the described colour wheel of described control produces the light pulse of described predetermined color under the effect of described light source step comprises:
Be arranged in the look section of determining described predetermined color according to described synchronizing pulse and describedly control described light source when going out on the light path and produce an illumination light pulse, so that described illumination light pulse forms the light pulse of described predetermined color after the look section effect of described predetermined color.
16. method of adjustment according to claim 15 is characterized in that, described look section determine described predetermined color according to described synchronizing pulse is arranged at describedly to be controlled the step that described light source produces an illumination light pulse when going out on the light path and comprises:
Control described light source and move in the look section of described predetermined color and describedly open when going out light path, and shift out in the look section of described predetermined color and describedly to close when going out light path.
17. method of adjustment according to claim 16 is characterized in that, the described light source of described control moves in the look section of described predetermined color and describedly opens when going out light path, and shifts out described step of closing when going out light path in the look section of described predetermined color and comprise:
Control described light source and cover fully in the look section of described predetermined color and describedly open when going out light path, and partly shift out in the look section of described predetermined color and describedly to close when going out light path.
18. method of adjustment according to claim 14 is characterized in that, describedly determines that according to described luminous flux the step of best colour wheel time delay comprises:
Select corresponding described candidate's color wheel delay time of light pulse of described predetermined color of described luminous flux maximum as described best colour wheel time delay.
19. method of adjustment according to claim 14, it is characterized in that, described basis can utilize the light pulse of described predetermined color to show that the steps of the picture signal of predetermined image, described a plurality of synchronizing pulses and the modulating pulse of the many groups of generation of a plurality of candidate's color wheel delay time comprise:
Obtain the original color wheel delay time and the described original color wheel delay time is carried out increasing or decreasing, to form described a plurality of candidate's color wheel delay time.
20. method of adjustment according to claim 19 is characterized in that, the temporal summation that the described original color wheel delay time is increased progressively or the temporal summation of successively decreasing are not more than the cycle of operation of described colour wheel.
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