CN102932653B - For the method and apparatus projecting at least one light beam - Google Patents

Abstract

The present invention proposes a kind of method and apparatus for projecting at least one light beam.According to the present invention for projecting in the method for at least one light beam, at least in part the persistent period that keeps of at least one picture point is extended relative at least one other picture point；The first information of picture point changes according to the second information；And the first information of picture point is changed into so that obtaining the second information when obtaining at least one follow-up picture point.

Description

For the method and apparatus projecting at least one light beam

The application is the applying date is on January 8th, 2008, the divisional application that application number is 200880124376.6, denomination of invention is " method and apparatus for projecting at least one light beam " and the application for a patent for invention applying for artificial Aosilanmu Ltd.

Technical field

The present invention relates to a kind of method and apparatus for projecting at least one light beam.

Background technology

In the projector based on so-called " flying spot (Flying-Spot) " principle of work and power, deflect light beam (typical case is made up of three primary colors red, green and blue) by two dimension resonance micro mirror, and project on the plane of delineation.

Fig. 1 illustrates the schematic diagram for principle of work and power that " flying spot " project is described.At this, lasing light emitter 101(red R), 102(blueness B) and 103(green G) the light beam of different colours be respectively aligned to translucent mirror (transmission of mirror and reflection carry out) 104,105,106 according to wavelength, and consequently as total beam 110(also referred to as projection beam) alignment two dimension resonance micro mirror 107, total beam 110 is deflected and projects on the plane of delineation 108 by two-dimensionally.At this, by deflecting total beam 110 in phase builds image (beam profile 109 referring in the plane of delineation 108) continuously in the plane of delineation 108.

Image information by respective sources 101 to 103 and the intensity modulated of deflection synchronization of micro mirror 107 generate and show.

Due to the nonlinear deflection of micro mirror 107 and nonlinear beam profile 109 obtained in the plane of delineation 108, time-multiplexed method is used to show the image information (" picture point " or " pixel ") that each position is discrete: therefore the information determined projected on the plane of delineation in the time period limited.

The information projected especially represents the brightness of the light beam produced by light source 101 to 103 and the superposition of color, and wherein the brightness of light beam can regulate by the amplitude of relevant light source.

Preferably, light source is laser instrument, especially laser diode respectively.Therefore, the brightness of the light launched by laser instrument is corresponded to by the electric current of laser instrument.

Fig. 2 illustrates the view of the sweep time range of each picture point relevant with the position of corresponding picture point, in seconds, or rather not only for row (referring to curve 201) and for row (referring to curve 202).

Such as, the image projected is that 640 picture point are wide and 480 picture point height.By shown in Fig. 1 and described, total beam 110 is deflected 109 generations: such as when pressing the image that row builds, the middle part that total beam 110 is expert at is substantially than in border area more faster.

Exemplarily, there is the horizontal frequency of 27kHz and the vertical frequency of 1.2kHz according to the micro mirror in the example of Fig. 2 when the resolution of 640 × 480 picture point.

Thus, by time-multiplexed method, by picture point obtaining time range about the spatial coherence in the XY coordinate system of time, restricted length and the persistent period for each picture point on the time.

Fig. 3 illustrates a part for the time range gone in the region (in the middle part of image) at the middle part at the plane of delineation in Fig. 2 along (level).

Summary of the invention

Become apparent that according to above mentioned parameter: without local error, image information is shown that the temporal resolution needed for electronic installation on the projection surface is less than in the scope of picosecond by intensity or amplitude for modulating light beam.In theory, association error can be reduced by correspondingly time upper high-resolution and high cost circuit.But, the device that this cost requirement is expensive, and actually (such as to depend on selected resolution) be not feasible all the time.

But, if reduce temporal resolution, then image degradation and due to mistake space correlation and in picture point plane, distortion occurs.

Another problem is that the conversion between time range and the band of position owing to the nonlinear deflection of micro mirror causes.

In the time period selecting picture point by time-multiplexed method, the rise time of electronic installation and fall time have impact on the contrast between picture point.This impact by signal edge rise or decline persistent period and strengthen: edge with to picture point can time and space compared with more long, then the contrast between picture point is more poor.

According to the above-mentioned form of implementation for Fig. 2 and Fig. 3, when constant edge slope, when there being the minimum time can use (namely in the picture portion) on the whole for picture point, then contrast is then worst.

Fig. 4 schematically illustrates an image to be projected part the plane of delineation with big as far as possible contrast (namely from white to the transition of black or contrary between each two picture point).

Fig. 5 illustrates the driving voltage 501 for laser instrument and the electric current 502 by laser instrument thus obtained accordingly simplifiedly.

By the typically brightness that is proportional to the light quantity launched and that feel thus corresponding to observer of the curent change process 502 of laser instrument.

Figure 5 illustrates picture point n-2, n-1 and n, they exemplarily have duration T_pAnd there is the pattern of the light-dark according to Fig. 4-bright.Driving voltage 501 is by laser turn-on, shutoff and connects again.

Based on final edge slope, form switch on delay 503 and 505 when connecting laser instrument, and form turn-off delay 504 and 506 when turning off laser instrument.

These postpone the contrast deteriorating significantly between picture point.Dark picture point being illuminated particularly in part during postponing 504 and 506, thus the maximum accessible contrast of projecting cell (high position frequency or spatial frequency) when the edge in showing image substantially reduces.

Fig. 6 illustrates the circuit block diagram for excitation laser 603.

There is the digital signal 605 of n-bit width by digital/analog converter 601(DAC) convert analogue signal to and amplify by the driver for excitation laser 603.Laser instrument 603 is connected to power supply 604(VDD with its positive pole) go up and encouraged by driver 602 by digital/analog converter 601.

Image source such as personal computer or PDA(Personal Digital Assistant) provide the digital signal 605 with n-bit width, and it is correspondingly converted to analogue signal (current signal or voltage signal) for excitation laser 603 by digital/analog converter 601.

Required high time resolution is realized by high conversion ratio (sample rate).The conversion ratio of digital/analog converter 601 is proposed high requirement by this.

Exemplarily, if the system of the vertical frequency with the resolution of 640 × 480 picture point, the horizontal frequency of 27kHz and 1.18kHz described above is observed, then digital/analog converter 601 must provide for the temporal resolution less than 280ps, and thus position resolution error is below 1%.

This means the bandwidth requirement of the 3GHz of the conversion ratio to digital/analog converter 601 and digital interface.

If this electronic installation can realize completely, necessarily extremely complex, be with lossy, and be expensive.Further it is noted that: it is required that the circuit shown in Fig. 6 and consequent expense are respectively directed to each laser instrument, and thus makes associated cost double.

The task of the present invention is in that, it is to avoid drawbacks discussed above, and provides a kind of simple, efficient and tolerable error and with low cost projection probability when particularly in " flying spot " mode.

This task solves according to the feature of the method and apparatus for projecting at least one light beam of the present invention.The improvement project of the present invention is also obtained by the specific embodiment of the method and apparatus of described at least one light beam of projection.

A kind of method for projecting at least one light beam is proposed in order to solve this task, the persistent period that keeps of at least one picture point is partly extended by least a part of which relative at least one other picture point, the first information of picture point changes according to the second information, and the first information of wherein picture point is changed into so that obtaining the second information when obtaining at least one follow-up picture point.

Propose a kind of device for projecting at least one light beam to solve this task, comprising: delay-level, can at least in part the persistent period that keeps of at least one picture point be extended relative at least one other picture point by this delay-level；And for improving the unit of contrast, wherein the first information of picture point can change according to the second information, and the first information of picture point is amenable to so that obtaining the second information when obtaining at least one follow-up picture point.

Proposing a kind of method for projecting at least one light beam to solve this task, the maintenance persistent period of at least one picture point is partly extended by least a part of which relative at least one other picture point.

When particularly in flying-spot method, projection beam moves in phase on the image plane.As set forth above, the speed of projection beam changes according to the position of the picture point to show.Thus, than the picture point of the edge on perspective plane, there is shorter duration (i.e. projection beam have at this corresponding higher speed) in the picture point at the middle part of the row on perspective plane.

This effect compensates effectively in the following way: especially all following points is introduced and keeps the persistent period: these have bigger duration compared with the picture point that wherein projection beam has maximal rate.

May be used for including the projection beam of multiple light beam in this proposed scheme, or each single light beam can also be respectively used to.

Term " keep persistent period " especially includes value (at least one laser instrument of such as at least one light beam modulation electric current) or the information of picture point.

Fundamental clock, carrys out the digital unit of drive circuit by it.

One expansion scheme is in that: the location of projection according to corresponding picture point, extends the maintenance persistent period of at least one picture point at least in part.

Advantageously, the persistent period is kept level can be kept to extend by least one sampling.

Especially, persistent period and fundamental clock is kept to regulate asynchronously.Thus it is not necessary that: fundamental clock is each possible integer many times keeping the persistent period.Thus can advantageously reduce maximum required operating frequency or the fundamental clock of digital unit.

One improvement project is: at least one digital/analog converter is used for encouraging at least one light beam,

-wherein digital/analog converter fundamental clock drive,

-wherein extend maintenance persistent period of at least one picture point in the following way at least partly: determine pixel clock according to fundamental clock, wherein extend the maintenance persistent period of at least one picture point based on pixel clock.

Especially, an improvement project is: pixel clock is corresponding to the integer many times of fundamental clock.

Advantageously, the maintenance persistent period can be asynchronous with fundamental clock and pixel clock.

Another improvement project is: keep the persistent period can regulate by delay-level.Especially, delay-level can encourage by (numeral) pumping signal.

At this, the digital signal of predetermined width (such as 4 bits or 5 bits) preferably can be used according to the quantization needed for postponing.

One expansion scheme is: delay-level includes sampling and keeps level and time-controlling arrangement, and wherein time-controlling arrangement controls sampling maintenance level by pumping signal.

Therefore, it is possible to use digital stimulus signal generates pulse, its length relevant to pumping signal and therefore previously given sampling maintenance level maintenance persistent period.

It is also possible that previously given in an analog fashion and by this simulation the pumping signal of pumping signal carrys out excitation samples keeps level.

Preferably, numeral or analogue stimulus signal corresponding to relevant with homolographic projection, in order to be reached or fallen below the maintenance persistent period needed for previously given minimum requirements (Resolution Error).

Another expansion scheme is: the first information of picture point changes according to the second information.Especially, the first information of picture point can change during projecting the duration of this picture point.

Thus, problem and the contrast thus obtained of limited edge slope reduce and can be effectively compensated.So, the first information of picture point can before the duration of the first picture point expires with the second information matches of picture point.To this, it is advantageous to by two picture point buffer memorys and their information is compared mutually or adaptive as described.

Alternatively, it is also possible to only previous value is carried out buffer memory.

One improvement project is: the first information includes the amplitude for showing image and/or brightness.Correspondingly, the second information can include amplitude and/or the brightness of at least one follow-up picture point.

Especially, the brightness of picture point can be relevant with the size of the modulation electric current of laser instrument.

Another improvement project is: the first information of picture point is changed into so that substantially obtaining the second information when obtaining at least one follow-up picture point.

Especially, obtain at least one follow-up picture point and can include one of following standard:

-when obtaining at least one follow-up picture point, very recently or in the near future；

-substantially obtain space that picture point is previously given stretch when, very recently or in the near future.

One improvement project is: at least one picture point is provided with memorizer, for the first information and second information of picture point being compared.

Especially, memorizer can include the sampling maintenance level of two alternative excitations.

One expansion scheme is to arrange at least two digital/analog converter, and they alternately encourage light beam, for the first information and second information of picture point being compared.

At this, digital/analog converter undertakes the function of memorizer, and its mode is alternately to compare the output signal of digital/analog converter.

Alternatively, it is also possible to the digital/analog converter of the sample rate with twice is set.Be stored in is level can be kept to carry out by sampling.

Another expansion scheme is in that: the first information of picture point changes according to the second information, and its mode is substantially to deduct from the persistent period of picture point the fall time needed for the edge declined at the end of picture point.

Additionally, an improvement project is: at least one light beam is parameterized for making compensating image error.

Such as, so can the static alignment error of compensatory light or laser instrument or optics.Due to this inexactness, for instance define the possible skew between the light beam of multiple light sources (laser instrument that such as three colors are different) on the plane of delineation (projection plane).Thus, the different point on perspective plane is illuminated by light source in the previously given moment.This error is along with the illumination duration reduced and therefore increases constantly along with higher resolution.

It is capable of the compensation of this alignment error (namely less than in the region of picture point) in obtained subpixel area in this proposed scheme, without complicated and high cost mounting technique.

Thus, an improvement project is: at least one light beam each keep the persistent period to be adjusted so that each of at least one light beam is projected in the region corresponding with the picture point being respectively associated.

Another improvement project is: at least one light beam described deflects partly by the projection arrangement of deflection.Preferably, the projection arrangement of deflection is micro mirror, especially two dimension resonance micro mirror.

Another improvement project is, at least one light beam described is made up of at least one light source.

Especially, an improvement project is: at least one light source described includes at least one laser instrument, especially at least one laser diode.

One improvement project is: light beam is made up of a red laser, a blue laser and a green laser.

Additionally, an improvement project is: light beam is made up of a red laser, a blue laser and two green lasers.

Correspondingly, light beam can be made up of the combinations thereof of many times.

In the scope of additional improvement project, at least one light beam described projects by flying-spot method.

In addition, in order to solve task described above, proposing a kind of device for projecting at least one light beam, it includes processor unit and/or the logic circuit of the fixing circuit arrangement connected and/or freely programmable, and this Logic Circuit Design is for making to perform method as the described herein.

Above-mentioned processor unit can be or include any kind of processor or computer or computer, and it is with corresponding required peripheral circuit (memorizer, input/output interface, input/output unit etc.).The logic circuit of the fixing circuit unit connected or freely programmable can be FPGA, CPLD, ASIC or other integrated circuits.

In order to solve above-mentioned task, it is also proposed that a kind of device for projecting at least one light beam, it includes delay-level, can be postponed relative at least one other picture point the persistent period that keep of at least one picture point at least in part by this delay-level.

This device correspondingly it is equally applicable to for the improvement project of diverse ways, expansion scheme and other forms of implementation.

One improvement project is: the location of projection according to corresponding picture point, can extension pin maintenance persistent period at least one picture point described at least in part by delay-level.

Next improvement project is: be provided with digital/analog converter for encouraging at least one light beam described,

-wherein digital analog converter can drive by fundamental clock,

-wherein can extend the maintenance persistent period at least one picture point described at least partly, its mode is: by fundamental clock to determine pixel clock, wherein can extend the maintenance persistent period at least one picture point described based on pixel clock.

One expansion scheme is, pixel clock is corresponding to the integer many times of fundamental clock.

One alternative form of implementation is in that: can encourage delay-level by pumping signal, especially digital stimulus signal.

Next expansion scheme is: delay-level includes sampling and keeps level and time-controlling arrangement, and wherein time-controlling arrangement controls to adopt maintenance level by pumping signal.

Another expansion scheme is: this device has the unit for improving contrast, and wherein the first information of picture point can change according to the second information.

One improvement project is: the first information of picture point can change during the duration of the projection of picture point.

One additional expansion scheme is: the first information includes the amplitude for showing picture point and/or brightness.Correspondingly, the second information can include amplitude and/or the brightness of at least one follow-up picture point.

Another expansion scheme is: the first information of picture point can be changed into so that substantially obtaining the second information when obtaining at least one follow-up picture point described.

Further possibility is, obtains at least one follow-up picture point described and includes one of following standard:

-when obtaining at least one follow-up picture point, very recently or in the near future；

-substantially obtain space that picture point is previously given stretch when, very recently or in the near future.

Another expansion scheme is: be provided with the memorizer at least one picture point, for the first information and second information of picture point being compared.

Another improvement project is: memorizer includes two and kept level by the sampling of alternative excitation.

One improvement project is: being provided with at least two digital/analog converter, they alternately encourage light beam, in order to the first information of picture point and the second information to be compared.

One improvement project is in that: the first information of picture point can change according to the second information, and its mode is substantially to deduct from the persistent period of picture point the fall time needed for the edge declined at the end of picture point.

Another expansion scheme is: at least one light beam described can parameter turn to so that compensating image error.

One expansion scheme is: by delay-level to regulate the maintenance persistent period of each of at least one light beam so that each of at least one light beam is projected to corresponding in the region of the picture point being respectively associated.

Additionally, an expansion scheme is: be provided with the projection arrangement of deflection, it is partly by least one light beam steering described.Especially, the projection arrangement of deflection can include micro mirror, especially two dimension resonance micro mirror.

In the scope of an additional improvement project, at least one light beam described can be made up of at least one light source.Preferably, at least one light source described can include at least one laser instrument, especially at least one laser diode.

One improvement project is: light beam is made up of a red laser, a blue laser and a green laser.

Another expansion scheme is: light beam is made up of a red laser, a blue laser and two green lasers.

Another improvement project is: this device is by flying-spot method projection at least one light beam described.

Accompanying drawing explanation

In the preceding article, it is illustrated in the accompanying drawings and elaborates technical scheme of the prior art.

Wherein:

Fig. 1 illustrates the schematic diagram for principle of work and power that " flying spot " project is described.

Fig. 2 illustrates the view of the sweep time range of each picture point relevant with the position of corresponding picture point, in seconds.

Fig. 3 illustrates a part for the time range gone in the region (in the middle part of image) at the middle part at the plane of delineation in Fig. 2 along (level).

Fig. 4 schematically illustrates an image to be projected part the plane of delineation with big as far as possible contrast (namely from white to the transition of black or contrary between each two picture point).

Fig. 5 illustrates the driving voltage 501 for laser instrument and the electric current 502 by laser instrument thus obtained accordingly simplifiedly.

Fig. 6 illustrates the circuit block diagram for excitation laser 603.

Illustrate referring to accompanying drawing and elaborate embodiments of the invention.

Wherein:

Fig. 7 illustrates a kind of for the circuit block diagram by delay-level excitation laser.

Fig. 8 illustrates the view of the time range of the quantization in the region around portion in the picture to each picture point；

Fig. 9 illustrates time range and the dependency of the picture point determined；

Figure 10 illustrates the circuit block diagram for carrying out excitation laser by (programmable) delay-level, and wherein this delay-level includes time-controlling arrangement and keeps the switch of level with sampling；

Figure 11 illustrates the block diagram of circuit, can produce edge alternative by this circuit and have the pulse of previously given width.

Figure 12 illustrates the sequential chart associated with Figure 11；

Figure 13 illustrates the circuit block diagram of the pulse optionally producing previously given width for edge；

Figure 14 illustrate especially to picture point n, n+1 etc. and the sequential chart that with Figure 13 associate relevant with fundamental clock；

Figure 15 illustrates the figure of the time changing curve of the pumping signal with laser instrument；Wherein the excitation persistent period can be changed according to picture point content and rise time or fall time to the modulation electric current needed for laser instrument.

Figure 16 illustrates a table, wherein for compensating and illustrating such as this tittle of contrast, contrast ratio, maximum intensity and minimum strength without the situation contrast compensated；

Figure 17 A illustrate the rise time with edge or fall time relevant, with balanced contrast with without the comparison of contrast compensated；

Figure 17 B illustrate the rise time with edge or fall time relevant, with balanced contrast ratio with without the comparison of contrast ratio compensated；

Figure 17 C illustrate the rise time with edge or fall time relevant, by compensating the energy loss that causes of nonideal edge and luminance loss thus.

Figure 18 illustrates the circuit block diagram carrying out excitation laser by the unit for improving contrast；

Figure 19 illustrates the sequential chart of projection that associate, based on the checkerboard pattern according to Fig. 4 with Figure 18；

Figure 20 illustrates sequential chart from Figure 18 association, projection based on different bright picture point, and wherein picture point n-1 only has the brightness slightly reduced relative to picture point n-2；

Figure 21 illustrates an alternative expansion scheme of the circuit block diagram carrying out excitation laser by the unit for improving contrast, wherein replaces according to Figure 18 two samplings to keep level to employ two digital/analog converters.

Figure 22 illustrates the sequential chart associated with Figure 21.

Detailed description of the invention

Scheme described herein is especially capable of in the signal path between digital/analog converter and output stage or drive circuit effectively reduce correlated error spatially by delay-level that is programmable or that adjust in an analog fashion.

This realizes especially by following manner: the output signal of digital/analog converter keeps previously given duration so that time of staying geometry corresponding with the picture point in the image projected or position correspond to the correct display of picture point about ground.

In addition, in the problem that this proposed scheme allows to solve limited edge slope as follows: the information (such as amplitude or brightness) of each picture point changes according to the information (such as amplitude or brightness) of at least one follow-up picture point, especially its mode is deduct the fall time needed for the edge of decline from the nominal time of this picture point at the end of picture point.

Thus effectively prevent the clear and definite space correlation losing picture point on the projection surface due to limited edge slope.

Another favourable scheme is in that the combination of solution.For reducing the solution of spatially-correlated errors and optimizing the time of the contrast each picture point of impact by compensating limited edge unit.

In addition, it is proposed that compensate the alignment error in vertical subpixel area by controlling the time of each picture point.

Improvement to spatial coherence

Fig. 7 illustrates the circuit block diagram carrying out excitation laser 703 by delay-level 706.

There is the digital signal 705 of n-bit width by digital/analog converter 701(DAC) convert analogue signal to, it is delayed by time by adjustable delay-level 706 and amplifies by the driver for excitation laser 703.This laser instrument 703 is connected to power supply 704(VDD with its positive pole) on.

Thus obtain, for driving the asynchronism having a mind between fundamental clock and the pixel clock of digital/analog converter 701, in this pixel clock, wherein showing corresponding picture point.

Such as, if it is assumed that be the system (wherein for the micro mirror that projection beam deflects is had the horizontal frequency of 27kHz and the vertical frequency of 1.18kHz) of the resolution with 640 × 480 pixels, then digital/analog converter 701 has the temporal resolution less than 280ps, and thus local resolution error (or association error) is below 1%.

Resolution error stretches corresponding to the space having error of pixel on a projection plane.

What thus obtain is according to the time quantization of each picture point in the middle part of the image of Fig. 8.

Associating of the picture point that figure 9 illustrates time range and determine.

For projecting the picture point (such as with the picture point of coordinate (width, highly) 320,240) at capable middle part, for the time range needed for this picture point n corresponding to fundamental clock.This is by the fact that obtain: picture point n is needed to the shortest time range occurred in the picture point of all projections, because projection beam is with the maximum inswept picture point n of speed.

Thus, the time range T of picture point n_pDetermine the persistent period of fundamental clock, drive digital/analog converter by this persistent period.

Such as, when the image frequency rate of vertical 1.18kHz and horizontal 27kHz and 640 × 480 resolution obtain the fundamental clock of 56MHz because the described time range to picture point n is 18ns.

In order to reach previously given precision when the time of each single picture point associates with position, according to the time range Δ t that the time range of Fig. 9, the picture point n+1 time range than picture point n is extra greatly_p。

According to this example, extra time range Δ t_pIt is set to 280ps, so as to realize the association error below 1%.

Additionally, the time range 2 Δ t that time range that the time range of picture point n+2 is than picture point n+1 is extra greatly_p.Accordingly, for picture point to edge in the middle part of image, required extra time range pointwise becomes much larger.From the picture point m determined, extra time range is:

m·Δt_p=T_p

This means: pixel clock can reduce by half from picture point m, because being suitable for:

m·Δt_p+T_p=2 Δ T_p

Advantageously, the time basis (reference clock) of whole system is chosen so as to the integral divisor of time range (pixel clock) of picture point that it is shortest time.

Such as, 4 bit interface with the fundamental clock of 112MHz may be used for excitation delay-level.

The model for two-dimensional shown in Fig. 6 can also be applied to other schemes of mirror system equally.

Figure 10 illustrates the circuit block diagram for carrying out excitation laser 1008 by (programmable) delay-level 1001, and this delay-level includes time-controlling arrangement 1005 and switch 1004.

With the digital signal 1010 of n-bit width by digital/analog converter 1002(DAC) convert analogue signal to and be applied on switch 1004.The digital stimulus signal 1011 of time-controlling arrangement 1005 controls switch 1004 so that the analogue signal of digital/analog converter 1002 is mapped on the corresponding time range of picture point.

The outfan of switch 1004 is connected with output stage, and this output stage includes driver 1007, laser instrument 1008 and the power supply 1009 for laser instrument.

Switch 1004 includes so-called sampling and keeps level.Even if input value is no longer applied to sampling keeps level, this sampling keeps level keep analog input value or stored the previously given time period.

Time-controlling arrangement 1005 carrys out parametrization by pumping signal 1011, value according to control signal 1011 encourages switch 1004, and therefore realizes sampling and keep the delay corresponding to pumping signal 1011 of level.

The following describe time-controlling arrangement 1005 and possible realization thereof and expansion scheme.

First, Figure 11 illustrates the circuit block diagram of circuit, can produce edge by this circuit and optionally have the pulse of previously given width.Figure 12 illustrates the sequential chart associated with Figure 11.

Figure 11 illustrates input signal U_i, it is applied on the input of NAND gate 1103 and on the input of NOR-gate 1106.Additionally, input signal U_iIt is connected with another input of NAND gate 1103 with follow-up phase inverter 1102 by delay-level 1101.Input signal U_iIt is connected with another input of NOR-gate 1106 with follow-up phase inverter 1105 also by delay-level 1104.NAND gate 1103 provides voltage U_bAs output signal, NOR-gate 1106 provides voltage U_aAs output signal.

Signal is postponed duration Δ t by delay-level 1101 and 1104 respectively.

Voltage change process U_i、U_aAnd U_bIt is shown in the sequential chart of Figure 12.

Utopian sequential at Figure 12 there is shown: input signal U_iRising edge cause voltage U_bDuration Δ t is transformed to " 0 " by " 1 ".Correspondingly, input signal U_iTrailing edge cause voltage U_aDuration Δ t is transformed to " 1 " by " 0 ".

Figure 13 illustrates the circuit block diagram of the pulse optionally producing width that can be previously given for edge.

Figure 13 includes frame 1303, and it corresponds essentially to the circuit block diagram according to Figure 11.With Figure 11 the difference is that, in frame 1303 replace input signal U_iIt is applied with (pretreated) pixel clock 1301.Additionally, corresponding delay-level can regulate by control signal (control parameter) 1302.The outfan of frame 1303 has the signal 1304(voltage U replacing Figure 11_b) and signal 1305(replace the voltage U of Figure 11_a) available.

The unit 1306(pulse generator for producing pulse it is connected to after frame 1303), it includes two phase inverters 1307 and 1309 and NAND gate 1308 and NOR-gate 1310.Signal 1304 is directly connected with NAND gate 1308 on one side, is connected with NAND gate 1308 by phase inverter 1307.Signal 1305 is directly connected with NOR-gate 1310 on one side, is connected with NOR-gate 1310 by phase inverter 1309.

The outfan of NAND gate 1308 is connected with the SET input (arranging input) of trigger 1314 by phase inverter 1311.The outfan of NOR-gate 1310 is connected with the RESET input (the RESET input) of trigger 1314.Trigger 1314 is especially embodied as rest-set flip-flop.

The signal intercepted on the outfan of NAND gate 1308 is called signal 1312, and the signal intercepted on the outfan of NOR-gate 1310 is called signal 1313.The Q output of trigger 1314 intercepts pumping signal 1315.

Figure 14 illustrates and Figure 13 association, especially relevant with picture point n, n+1 etc. and fundamental clock sequential chart.

For picture point n, fundamental clock is synchronize with pixel clock 1301, because such as picture point n is below figure picture point: when this picture point, projection beam has maximum speed and therefore provides the minimum time period for this picture point n in all picture point.

Signal 1304 describes the output signal of the first delay-level.From logical zero to logical one, in each transition of (rising edge), logical zero pulse is produced following when for signal 1304: signal 1305 is logical zero in this moment at pixel clock 1301.This, for picture point n+4 situation really not so (when the rising edge of pixel clock 1301, signal 1305 is logical one), is absent from trailing edge thus in signal 1304 at this.

Signal 1305 has the transition to logical one at each trailing edge of pixel clock 1301.

The pulse width of signal 1304 and 1305 and control signal 1302(are referring to Figure 13) relevant.

The short pulse that the rising edge (transition from logical zero to logical one) of signal 1304 and the trailing edge (transition from logical one to logical zero) of signal 1305 produce respectively according to signal 1312 and according to signal 1313 rushes.These pulses for carrying out set (by signal 1312) and resetting (by signal 1313) by trigger 1314.

Signal 1315 on the Q output of trigger 1314 keeps level for excitation samples.

The program has the advantage that sampling keeps the pumping signal 1315 of level and fundamental clock asynchronous, and thus can reach the high position resolution of optical projection system.Thus, sampling keeps the pulse width of the pumping signal 1315 of level can change and consider following situation: the picture point (" picture point n ") in portion has shorter duration compared with the picture point of the edge of the image in projection in the picture, and especially the duration of picture point n increases towards direction, edge.

At this, the pulse width ratio for the logical one pulse of picture point n is little for the pulse width of the logical zero pulse of picture point n+1.This means: the pulse width of logical one pulse and the pulse width of logical zero pulse continue to increase to image edge in the middle part of the image of the image of projection.

If the pulse width of this pumping signal 1315 needs the integer many times (such as in fig. 14 for picture point n+4) of the cycle duration of fundamental clock, then pixel clock 1301 reduces by half (from picture point n+5, pixel clock 1301 reduces by half relative to picture point n+4), wherein the edge of pixel clock 1301 is the time reference of the circuit according to Figure 13, and thus signal 1304 and 1305 is correspondingly generated by the pixel clock 1301 after changing from picture point n+5.

The edge of pumping signal 1315 determines the sampling according to Figure 10 and keeps the control signal 1401 of level.By control signal 1401 each pulse by Figure 10 switch 1004 make pulses duration.Thus the output valve of digital/analog converter is sampled maintenance level storage in this duration, and is transmitted to output stage 1006.The signal of output stage 1006 illustrates as signal 1402 in fig. 14.

The width of pulse passes through the control signal 1302(of digital interface referring to Figure 13) determine.This be capable of each picture point needed for time range carry out precise time with the relevant position of picture point on the projection surface and associate.

Owing to the duration of each picture point increases continuously towards border area in the middle part of image, it is possible that (such as the there are 4 bit widths) digital interface that is that instead of be provided with controlled enumerator, the delay needed for the difference of its independently previously given picture point.This has the advantage that the width that can reduce data/address bus.

The improvement of contrast

Figure 15 illustrates the figure of the time course with the pumping signal for laser instrument, wherein encourage the change of persistent period can carry out according to the modulation rise time of electric current needed for laser instrument or fall time and picture point content.

Figure 5 illustrates when do not have presented herein for compensate scheme the excitation of laser instrument.Without compensation, it is impossible to adjacent picture point is separated clearly.

And the compensation according to Figure 15 allows to separate clearly adjacent area: each picture point needs duration T_p.Obtaining rising edge or trailing edge by the limited switch time of laser instrument, they are respectively necessary for the duration t determined_c.This duration t_cEspecially information-related with picture point, for instance follow-up or preceding picture point amplitude or brightness.

The information (amplitude or brightness) being capable of substantially picture point being had been for when the duration of picture point expires follow-up picture point in this proposed compensation is adjusted.

This particularly in the amplitude of follow-up picture point less than the amplitude of present image point when be suitable for.

Thus be achieved that at adjacent or spatially ensuing picture point time range T_pBefore beginning, finish the amplitude fading of picture point to adjacent or the spatially amplitude of ensuing picture point value.

By following relevant to intensity I expression formula, this characteristic can be described:

Contrast defines:

$K=\frac{I_{\max }-I_{\min }}{I_{\max }+I_{\min }}$

Contrast ratio:

$\mathrm{Kv}:1=\frac{I_{\max }}{I_{\min }}:1$

Figure 16 illustrates a table, and it is for compensating and illustrating contrastively such as this tittle of contrast, contrast ratio, maximum intensity and minimum strength without situation about compensating.

In order to reach 100% from the 0% of maximum intensity, it is necessary to the time t shown in Figure 16_rf.In practice it is preferred to t_rfAssume following duration: maximum intensity needs this duration to reach 90% from the 10% of its value.Additionally, this be assume that simplifiedly linear rise (scope also for 0% to 100%).

Figure 17 A illustrate the rise time with edge or fall time relevant, with compensating (curve 1701) and without the comparison of contrast compensating (curve 1702).

Figure 17 B illustrate the rise time with edge or fall time relevant, with compensating (curve 1703) and without the comparison of contrast ratio compensating (curve 1704).

Figure 17 C illustrates the rise time with edge and fall time is relevant, the energy loss that caused by the edge of compensating non-linear and luminance loss 1705.

Such as, at the curve shown in Figure 17 A, 17B and 17C based on following parameter:

T_p=18ns

Parameter A_Offset/A_maxOwing to the impact of ambient light and the space of projection beam are stretched and produced.

By the comparison of Figure 17 A and the curve of Figure 17 B, via compensation described herein, form the obvious improvement of contrast or contrast ratio in identical edge slope situation.So, for instance when considering the edge slope of 2ns, and compared with the contrast of balanced 98% or the contrast ratio of 90:1, obtain and such as do not having the contrast of balanced 85% or the contrast ratio of 15:1.

If such as to reach the contrast ratio of 90:1, then thus obtain rise time or the fall time of 2ns when the luminance loss of 5% by described compensation method, or not by compensation method when the energy loss of 0% less than 200ps.

Thus it can be seen that the contrast ratio of 90:1 can not be obtained when not being used in this proposed compensation method.The intensity loss caused by compensation method can be compensated by the coupling of the modulation electric current of laser instrument.

Figure 18 illustrates the circuit block diagram carrying out excitation laser 1808 by the unit 1813 for improving contrast.

With the digital signal 1810 of n-bit width by digital/analog converter 1802(DAC) convert analogue signal to and be applied on switch 1801 and switch 1804.The sampling that switch 1801 includes being triggered by signal 1814 keeps level, and switchs the 1804 samplings maintenance levels including being triggered by signal 1815.

The outfan of switch 1801 is connected with switch 1812.The outfan of switch 1804 is connected similarly to switch 1812, and its breaker in middle 1812 outputs it, by switching signal 1816, the outfan held with switch 1801 and is connected or is connected with the outfan of switch 1804.

The outfan of switch 1801 and the outfan of switch 1804 are connected with the input of the unit 1813 for improving contrast respectively, and the outfan of unit 1813 is switch 1812 offer switching signals 1816.

Time-controlling arrangement 1805 is by digital stimulus signal 1811 parametrization, and wherein each outfan of time-controlling arrangement 1805 respectively provides signal 1814, signal 1815 and signal 1817 for encouraging the unit 1813 for improving contrast.

The outfan of switch 1812 is connected with output stage 1806, and this output stage includes driver 1807, laser instrument 1808 and the power supply 1809 for laser instrument.

Switch 1801 and 1804 in figure 18 respectively includes or describes sampling keeping level, as the storage link of simulation, the output voltage of digital/analog converter 1802 is stored previously given duration (it is especially greater than the duration shown needed for each picture point) by it.

Two this samplings being provided with switch 1801 and 1804 forms in figure 18 keep level.Correspondingly, it is possible to there is multiple switch or storage level.

The range value of the range value of current picture point Yu follow-up picture point is compared by the unit 1813 for improving contrast.The switching instant of switch 1812 is determined according to the amplitude difference between the range value being stored in switch 1801 and 1804.

Switch 1812 is switching between the signal being applied on switch 1801 and 1804, and the signal that will turn on is transmitted to output stage 1806.

Switch 1801 and 1804 is time controlled device 1805(, and it is especially embodied as digital processing level) encouraged by signal 1814 and 1815.Time-controlling arrangement 1805 especially digital interface by imaging system carrys out parametrization.

At this, parametrization especially includes the previously given system features determined, for instance the edge slope determined.

Switch 1812 is switched over according to the magnitude of voltage being stored in switch 1801 and 1804 by the unit 1813 for improving contrast by signal 1816, and obtains control signal 1817 from time-controlling arrangement 1805.

Figure 19 illustrates the sequential chart of projection that associate, based on the checkerboard pattern according to Fig. 4 with Figure 18.

Immediately preceding for the duration T needed for follow-up picture point n-2_pBefore beginning, close switch 1804.This is by for encouraging the pulse 1901 of the signal 1815 of switch 1804 to represent.

Accordingly, there are the information relevant to the amplitude of picture point n-2 and output stage 1806 can be transmitted to by switch 1812.

At the latest in the moment:

T₁=T_p-t_c

The image information of picture point n-1 keeps level to carry out buffer memory by the sampling of switch 1801.

Thus, for being used for the unit 1813 improving contrast at moment T₁The information relevant to the amplitude of the amplitude of current picture point n-2 and follow-up picture point n-1 is provided.Thus, the unit 1813 for improving contrast may determine that the switching instant of switch 1812 when known edge slope.

Thus effectively compensate for the fuzzy effect between each picture point, and thus improve the contrast between the picture point of different brightness consumingly.

Duration t_cEstimation can carry out approx at the situation next stage of hypothesis below: input signal U_iSaltatory change time, electric current I_LaserRising be linear about the time.Thus it is suitable for approx:

$t_c=\frac{|I_{n-1}-I_{n-2}|}{I_{\max }-I_{\min }}\·t_{\mathrm{rf}}$

Wherein I represents intensity and t_rfRepresent the time risen on edge or edge decline is required.

The situation of higher modulation electric current is needed than current picture point n-2, it is preferable that obtain for follow-up picture point n-1:

t_c=0。

This means: only when two adjacent picture point have luminance difference, the time range of picture point just mates.The method is used for improving efficiency or brightness of image.

Figure 20 illustrates sequential chart from Figure 18 association, picture point based on different brightness projection.Especially, picture point n-1 only has the brightness slightly reduced relative to picture point n-2.

The rising edge of signal 1814 and 1815 is for the time synchronized with fundamental clock.Signal 1816 preferably corresponds to again the signal operated by delay link.

Time difference between the rising edge and the rising edge of signal 1816 of signal 1815 and between the rising edge and the trailing edge of signal 1816 of signal 1814 is relevant with the image information of picture point in succession according to color.

Following exemplary ground considers the transition of picture point n-2 to picture point n-1.

When the clearest and the most definite, the amplitude difference between two picture point in succession is corresponding to the maximum dynamic response of output stage 1806 in time.Owing to may assume that by constant electric current I_LaserThe parasitic capacitance of laser diode is recharged, is to produced the edge of the finite slope running through electric current by laser diode.Maximum rise time or fall time are corresponding to the duration t between the rising edge and the trailing edge of signal 1816 of signal 1814_r.Maximum rise time or fall time are known preferably for system.

Duration t_cShow output signal I_LaserNeed how long to set up or eliminate the amplitude difference between adjacent picture point.Time difference between the rising edge and the trailing edge of signal 1816 of signal 1814 is thus derived as:

Δt=t_r-t_c

Amplitude peak between neighbor map picture point is poor, this time difference Δ t=0.

In from picture point n to the transition of picture point n+1, this relation is shown in fig. 20.

Thus, it is possible to consider duration t_rAnd time buffering, this time buffering is eliminated according to amplitude difference.

Especially, thus at duration t_rAnd there is relation between amplitude difference so that duration t_cRecalculated by electronic installation during transition every time from a picture point to next picture point.Preferably, this carries out in real time.

Corresponding to the form of implementation that above-mentioned and between signal 1816 and 1814 relation is relevant, it is possible to describe the relation between signal 1815 and 1816.

Figure 21 illustrates an alternative expansion scheme for carrying out excitation laser 2112 by the unit 2107 for improving contrast.

Figure 21 illustrates two digital/analog converters 2101 and 2102, and they are applied separately with Digital Image Data 2104 and 2105.Switch 2108 switches between the analog output of digital/analog converter 2101 or 2102, and the analogue signal being respectively turned on is connected with output stage 2110.

Output stage 2110 includes driver 2111, laser instrument 2112 and the power supply 2113 for this laser instrument.

Additionally, be provided with time-controlling arrangement 2103, it is by digital signal 2106 parametrization, and wherein the outfan of time-controlling arrangement 2103 provides signal for the unit 2107 being used for improving contrast.

Unit 2107 for improving contrast includes two inputs, and one of them is connected with the outfan of digital/analog converter 2101 or 2102.Outfan for improving the unit 2107 of contrast provides signal to encourage switch 2108.

The advantage of the circuit according to Figure 21 is in that: can save according to the switch 1801 and 1804 of Figure 18, because the range value of adjacent picture point is provided by digital/analog converter 2101 and 2102 respectively, and is kept in the previously given time period.

At this, advantageously: the digital/analog converter 1802 relative to Figure 18 of each maximum required processing speed in digital/analog converter 2101 and 2102 is reduced, therefore provide the following time period for digital/analog converter 2101 and 2102 to change:

2·T_p-t_c

As set forth above in conjunction with Figure 18 and 19, the switch 1812 in switch 2108(Figure 18) switching and pixel clock asynchronous.

Figure 22 illustrates the sequential chart associated with Figure 21.The pixel clock being changed in time-controlling arrangement 2103 double.This frequency improves and is preferably electronically undertaken by edge triggered flip-flop, and this trigger reacts along with state change optionally trailing edge and rising edge to input clock.

For the expression simplified, in fig. 22 pixel clock is shown as constant.

Especially, only the trailing edge of double pixel clock can also be considered as time basis to simplify.The amplitude difference determined by the unit 2107 for improving contrast converts the delay (signal 2201 referring in Figure 22) of double pixel clock to by analog circuit.

By primary signal and signal 2201 combination being obtained the selective pulse in edge by gate.

Figure 11 and Figure 12 has illustrated the level producing have the selective pulse in the edge determining width.

The width of the pulse generated is at this corresponding to the delay Δ t of two signal lines or propagation time difference, and described signal line terminates in gate (NAND or NOR).Thus, it is provided that two edges are as reference: the trailing edge of the output signal of the rising edge of double pixel clock and the delay circuit set forth.Both cause the switching of the switch 2108 in Figure 21 or the switch 1812 in Figure 18.Thus, it is possible to successfully carry out digital actuation.

Combination: improve spatial coherence and improve contrast

Scheme suggested above can advantageously combination with one another.

Such as, contrast can be improved by the function of the unit for improving spatial coherence described above, and this unit is preferably time controlled device excitation and excitation switch (switch) in self.

Spatial coherence is closed at least one switch by parametrization and is kept level to realize with the sampling of this at least one being connected as described.

Correspondingly, correlation error can also compensate in time-controlling arrangement.

Compensation to alignment error

Figure 10 illustrates that the one of the spatial coherence for picture point possible solution.If the parametrization of time-controlling arrangement 1005 is by correspondingly previously given, then obtain the corresponding predeformation of the image of projection.

In sub-pixel scope, the alignment error of Optical devices or laser instrument can be compensated (namely in the scope less than a picture point) at least in part by predeformation.

If alignment error such as on the projection surface causes the image-region being illuminated respectively of each laser instrument to be more or less the same in a picture point, then the image information of digital source can postpone to carry out pretreatment by by each lasing light emitter each other so that error is compensated (namely picture point is correspondingly correctly imaged onto on perspective plane) by electronic installation.

Additional advantage:

It is capable of separating the high time requirement of the conversion ratio of data-interface and digital/analog converter with the amplitude modulation(PAM) to respective sources (especially laser instrument) in this proposed scheme.

The program allows the laser projection system provided based on " flying spot " method when improving picture quality, because can when little error with high temporal resolution and thus with high position resolution display picture point.

Another advantage is that the more simple and favourable technology realizability of digital/analog converter, and reduce the requirement of the interface to imaging system, because the time quantization of picture point that need not be the shortest and the multiplication thus without processing speed.

Additional advantage is that required delay need not realize specific to color and therefore can pass through the interface with little bit width by the parametrization of each delay-level of three kinds of colors.

Alternatively, it is also possible to: postpone to carry out individually for each color so that the inexactness of the installation of such as respective sources can compensate by correspondingly controlling time-multiplexed method.

It has the additional advantage that, high contrast can also be realized when edge slope being had and comparing significant impact.Thus the requirement of the simulation electronic device for short switch time and edge precipitous accordingly is reduced.Additionally, the requirement of the technology of the analog driver circuitry providing modulation electric current is reduced.

From the above description, it can be seen that embodiment of the invention discloses that techniques below scheme, but it is not limited to this:

The technical scheme 1. 1 kinds method for projecting at least one light beam,

The persistent period that keeps of at least one picture point is partly extended by-at least a part of which relative at least one other picture point.

The technical scheme 2. method according to technical scheme 1, wherein according to the location of projection of corresponding picture point at least in part by the maintenance duration extension of at least one picture point described.

The technical scheme 3. method according to technical scheme 2, wherein encourages at least one light beam with at least one digital/analog converter,

-wherein digital/analog converter fundamental clock drive,

-at least a part of which is partly by the maintenance duration extension of at least one picture point described, and its mode is made by fundamental clock and determines pixel clock, wherein based on pixel clock by the maintenance duration extension of at least one picture point described.

The technical scheme 4. method according to technical scheme 3, wherein pixel clock is corresponding to the integer many times of fundamental clock.

Technical scheme 5., according to the method one of technique scheme Suo Shu, wherein keeps the persistent period can regulate by delay-level.

The technical scheme 6. method according to technical scheme 5, wherein delay-level encourages by pumping signal, especially digital stimulus signal.

The technical scheme 7. method according to technical scheme 6, wherein delay-level includes sampling and keeps level and time-controlling arrangement, and wherein time-controlling arrangement controls sampling maintenance level by pumping signal.

Technical scheme 8. is according to the method one of technique scheme Suo Shu, and wherein the first information of picture point changes according to the second information.

The technical scheme 9. method according to technical scheme 8, wherein the first information of picture point changes during the duration of the projection of picture point.

The technical scheme 10. method according to technical scheme 8 or 9, wherein the first information includes the amplitude for showing picture point and/or brightness.

Technical scheme 11. is according to the method one of technical scheme 8 to 10 Suo Shu, and wherein the second information includes amplitude and/or the brightness of at least one follow-up picture point.

Technical scheme 12. is according to the method one of technical scheme 8 to 11 Suo Shu, and wherein the first information of picture point is changed into so that substantially obtaining the second information when obtaining at least one follow-up picture point.

The technical scheme 13. method according to technical scheme 12, wherein obtains at least one follow-up picture point and includes one of following standard:

-when obtaining at least one follow-up picture point, very recently or in the near future；

-substantially obtain space that picture point is previously given stretch when, very recently or in the near future.

Technical scheme 14., according to the method one of technical scheme 8 to 13 Suo Shu, is provided with the memorizer at least one picture point, for the first information and second information of picture point being compared.

The technical scheme 15. method according to technical scheme 14, wherein memorizer includes the sampling maintenance level of two alternative excitations.

Technical scheme 16., according to the method one of technical scheme 8 to 15 Suo Shu, is provided with at least two digital/analog converter, and they alternately encourage light beam, for the first information and second information of picture point being compared.

Technical scheme 17. is according to the method one of technical scheme 8 to 16 Suo Shu, and wherein the first information of picture point changes according to the second information, and its mode is substantially to deduct from the persistent period of picture point the fall time needed for trailing edge in the end of picture point.

Technical scheme 18. is according to the method one of technique scheme Suo Shu, and at least one of which light beam parameters turns to so that compensating image error.

The technical scheme 19. method according to technical scheme 18, wherein at least one light beam each keep the persistent period to be adjusted so that each of at least one light beam projects to corresponding in the region of the picture point being respectively associated.

Technical scheme 20. is according to the method one of technique scheme Suo Shu, and at least one light beam wherein said deflects partly by the projection arrangement of deflection.

The technical scheme 21. method according to technical scheme 20, the projection arrangement wherein deflected includes micro mirror, especially two dimension resonance micro mirror.

Technical scheme 22. is according to the method one of technique scheme Suo Shu, and at least one light beam wherein said is made up of at least one light source.

The technical scheme 23. method according to technical scheme 22, at least one light source wherein said includes at least one laser instrument, especially at least one laser diode.

Technical scheme 24. is according to the method one of technique scheme Suo Shu, and wherein light beam is made up of a red laser, a blue laser and a green laser.

Technical scheme 25. is according to the method one of technique scheme Suo Shu, and wherein light beam is made up of a red laser, a blue laser and two green lasers.

Technical scheme 26. is according to the method one of technique scheme Suo Shu, and at least one light beam wherein said projects by flying-spot method.

Technical scheme 27. 1 kinds is for projecting the device of at least one light beam, it includes processor unit and/or the fixing circuit arrangement connected and/or the logic circuit that can freely program, and this Logic Circuit Design is make it possible to perform according to the method one of technique scheme Suo Shu.

Technical scheme 28. 1 kinds is for projecting the device of at least one light beam, including delay-level, can be extended relative at least one other picture point the persistent period that keep of at least one picture point at least in part by this delay-level.

The technical scheme 29. device according to technical scheme 28, wherein can by delay-level according to the location of projection of corresponding picture point at least in part by the maintenance duration extension of at least one picture point.

The technical scheme 30. device according to technical scheme 29, including the digital/analog converter for encouraging at least one light beam described,

-wherein can drive digital/analog converter by fundamental clock,

-wherein can at least in part by the maintenance duration extension of at least one picture point, its mode is made by fundamental clock and can determine pixel clock, wherein can based on pixel clock by the maintenance duration extension of at least one picture point described.

The technical scheme 31. device according to technical scheme 30, wherein pixel clock is corresponding to the integer many times of fundamental clock.

Technical scheme 32. is according to the device one of technical scheme 28 to 31 Suo Shu, and wherein delay-level can encourage by pumping signal, especially digital stimulus signal.

The technical scheme 33. device according to technical scheme 32, wherein delay-level includes sampling and keeps level and time-controlling arrangement, and wherein time-controlling arrangement controls sampling maintenance level by pumping signal.

Technical scheme 34. is according to the device one of technical scheme 28 to 33 Suo Shu, and including the unit for improving contrast, wherein the first information of picture point can change according to the second information.

The technical scheme 35. device according to technical scheme 34, wherein the first information of picture point changes during the duration of the projection of picture point.

The technical scheme 36. device according to technical scheme 34 or 35, wherein the first information includes the amplitude for showing picture point and/or brightness.

Technical scheme 37. is according to the device one of technical scheme 34 to 36 Suo Shu, and wherein the second information includes amplitude and/or the brightness of at least one follow-up picture point.

Technical scheme 38. is according to the device one of technical scheme 34 to 37 Suo Shu, and wherein the first information of picture point is amenable to so that substantially obtaining the second information when obtaining at least one follow-up picture point.

The technical scheme 39. device according to technical scheme 38, wherein obtains at least one follow-up picture point described and includes one of following standard:

-when obtaining at least one follow-up picture point described, very recently or in the near future；

-substantially obtain space that picture point is previously given stretch when, very recently or in the near future.

Technical scheme 40., according to the device one of technical scheme 34 to 39 Suo Shu, is provided with the memorizer at least one picture point, for the first information and second information of picture point being compared.

The technical scheme 41. device according to technical scheme 40, wherein memorizer includes the sampling maintenance level of two alternative excitations.

Technical scheme 42., according to the device one of technical scheme 34 to 41 Suo Shu, is provided with at least two digital/analog converter, and they excitations alternately encourage light beam, for the first information and second information of picture point being compared.

Technical scheme 43. is according to the device one of technical scheme 34 to 42 Suo Shu, wherein the first information of picture point can change according to the second information, and its mode is substantially to deduct from the persistent period of image the fall time needed for trailing edge in the end of picture point.

Technical scheme 44. is according to the device one of technical scheme 28 to 43 Suo Shu, and at least one light beam wherein said can be parameterized for making compensating image error.

The technical scheme 45. device according to technical scheme 44, by delay-level, the persistent period that keeps of each of at least one of which light beam is adjusted so that each of at least one light beam projects to corresponding in the region of the picture point being respectively associated.

Technical scheme 46. is according to the device one of technical scheme 28 to 45 Suo Shu, and the projection apparatus design wherein deflected is at least one light beam described of deflection partly.

The technical scheme 47. device according to technical scheme 46, the projection arrangement wherein deflected includes micro mirror, especially two dimension resonance micro mirror.

Technical scheme 48. is according to the device one of technical scheme 28 to 47 Suo Shu, and at least one light beam wherein said is made up of at least one light source.

The technical scheme 49. device according to technical scheme 48, at least one light source wherein said includes at least one laser instrument, especially at least one laser diode.

Technical scheme 50. is according to the device one of technical scheme 28 to 49 Suo Shu, and wherein light beam is made up of a red laser, a blue laser and a green laser.

Technical scheme 51. is according to the device one of technical scheme 28 to 50 Suo Shu, and wherein light beam is made up of a red laser, a blue laser and two green lasers.

Technical scheme 52. is according to the device one of technical scheme 28 to 51 Suo Shu, and it projects at least one light beam described by flying-spot method.

Accompanying drawing labelling table

101 red light sources

102 blue-light sources

103 green light sources

104 deflecting mirrors

105 deflecting mirrors

106 deflecting mirrors

107 micro mirrors, especially two dimension resonance micro mirror

108 planes of delineation

109 projection beam beam change procedure in the plane of delineation

110 total beams, projection beam

201 positions being used for respective image point show the curve of the sweep time range of the string of each picture point in seconds about ground

202 positions being used for respective image point show the curve of the sweep time range of a line of each picture point in seconds about ground

The driving voltage of 501 laser instrument

502 laser diode currents

503 switchs on delay

504 turn-off delays

505 switchs on delay

506 turn-off delays

601 digital/analog converters (DAC)

602 drivers

603 laser instrument

604 power supplys (VDD)

605 digital signals

701 digital/analog converters (DAC)

702 drivers

703 smooth devices

704 power supplys (VDD)

705 digital signals

706 delay-level

1001 delay-level

1002 digital/analog converters

1004 switches (keep level with sampling)

1005 time-controlling arrangements

1006 output stages

1007 drivers

1008 laser instrument

1009 power supplys

1010 digital signals

1011 pumping signals

1101 delay-level

1102 phase inverters

1103NAND door

1104 delay-level

1105 phase inverters

1106NOR door

1301 pixel clocks

1302 control signals (control parameter)

1303 frames according to Figure 11

1304 signals on the outfan of NAND gate

1305 signals on the outfan of NOR-gate

1306 for producing the unit (pulse generator) of pulse

1307 phase inverters

1308NAND door

1309 phase inverters

1310NOR door

1311 phase inverters

1312 signals on the outfan of phase inverter 1311

1313 signals on the outfan of NOR-gate 1310

1314 triggers (rest-set flip-flop)

1315 pumping signals

The 1701 curvilinear motion processes with balanced contrast relevant with the rise time at edge or fall time

The 1702 curvilinear motion processes without the contrast that compensate relevant with the rise time at edge or fall time

The 1703 curvilinear motion processes with balanced contrast ratio relevant with the rise time at edge or fall time

The 1704 curvilinear motion processes without the contrast ratio that compensate relevant with the rise time at edge or fall time

The curvilinear motion process of energy loss that 1705 compensation due to undesirable edge relevant with the rise time at edge or fall time cause and luminance loss thus

1801 switches (keep level with sampling)

1802 digital/analog converters

1804 switches (keep level with sampling)

1805 time-controlling arrangements

1806 output stages

1807 drivers

1808 laser instrument

1809 power supplys

1810 digital signals (with n-bit width)

1811 digital stimulus signal

1812 switches (switch)

1813 for improving the unit of contrast

1814 for triggering the signal of the sampling maintenance level in switch 1801

1815 for triggering the signal of the sampling maintenance level in switch 1804

1816 for switching the switching signal of switch 1812

1817 for encouraging the signal of the unit 1813 for improving contrast

1901 pulses

2101 digital/analog converters

2102 digital/analog converters

2103 time-controlling arrangements

2104 Digital Image Data

2105 Digital Image Data

2106 digital signals (for by time-controlling arrangement 2103 parametrization)

2107 for improving the unit of contrast

2108 switch

2110 output stages

2111 drivers

2112 laser instrument

2113 power supplys

2201 postpone signal

Claims (53)

1. the method for projecting at least one light beam,

The persistent period that keeps of at least one picture point is partly extended by-at least a part of which relative at least one other picture point；

The first information of-at least one picture point wherein said changes according to the second information；And

The first information of-at least one picture point wherein said is changed into so that obtaining the second information when obtaining at least one follow-up picture point.

2. method according to claim 1, wherein according to the location of projection of corresponding picture point at least in part by the maintenance duration extension of at least one picture point described.

3. method according to claim 2, wherein encourages at least one light beam with at least one digital/analog converter

-wherein digital/analog converter fundamental clock drive,

-at least a part of which is partly by the maintenance duration extension of at least one picture point described, and its mode is made by fundamental clock and determines pixel clock, wherein based on pixel clock by the maintenance duration extension of at least one picture point described.

4. method according to claim 3, wherein pixel clock corresponds to more than a times of the integer of fundamental clock.

5., according to the method one of the claims Suo Shu, wherein keep the persistent period can regulate by delay-level.

6. method according to claim 5, wherein delay-level encourages by pumping signal.

7. method according to claim 6, wherein said pumping signal is digital stimulus signal.

8. method according to claim 6, wherein delay-level includes sampling and keeps level and time-controlling arrangement, and wherein time-controlling arrangement controls sampling maintenance level by pumping signal.

9., according to the method one of Claims 1-4 Suo Shu, the first information of at least one picture point wherein said changes during the duration of the projection of at least one picture point described.

10., according to the method one of Claims 1-4 Suo Shu, wherein the first information includes the amplitude for showing at least one picture point described and/or brightness.

11. according to the method one of Claims 1-4 Suo Shu, wherein the second information includes amplitude and/or the brightness of at least one follow-up picture point.

12. according to the method one of Claims 1-4 Suo Shu, wherein obtain at least one follow-up picture point and include one of following standard:

-when obtaining at least one follow-up picture point, very recently or in the near future；

-obtain space that at least one follow-up picture point described is previously given stretch when, very recently or in the near future.

13. according to the method one of Claims 1-4 Suo Shu, be provided with the memorizer at least one picture point, for the first information and second information of at least one picture point described are compared.

14. method according to claim 13, wherein memorizer includes the sampling maintenance level of two alternative excitations.

15. according to the method one of Claims 1-4 Suo Shu, be provided with at least two digital/analog converter, described at least two digital/analog converter alternately encourages light beam, for the first information and second information of at least one picture point described being compared.

16. according to the method one of Claims 1-4 Suo Shu, the first information of at least one picture point wherein said changes according to the second information, and its mode is to deduct the fall time needed for trailing edge from the persistent period of at least one picture point described in the end of at least one picture point described.

17. according to the method one of Claims 1-4 Suo Shu, at least one of which light beam parameters turns to so that compensating image error.

18. method according to claim 17, wherein at least one light beam each keep the persistent period to be adjusted so that each of at least one light beam projects to corresponding in the region of the picture point being respectively associated.

19. according to the method one of Claims 1-4 Suo Shu, at least one light beam wherein said deflects partly by the projection arrangement of deflection.

20. method according to claim 19, the projection arrangement wherein deflected includes micro mirror.

21. method according to claim 20, wherein said micro mirror is two dimension resonance micro mirror.

22. according to the method one of Claims 1-4 Suo Shu, at least one light beam wherein said is made up of at least one light source.

23. method according to claim 22, at least one light source wherein said includes at least one laser instrument.

24. method according to claim 23, at least one laser instrument wherein said is at least one laser diode.

25. according to the method one of Claims 1-4 Suo Shu, wherein light beam is made up of a red laser, a blue laser and a green laser.

26. according to the method one of Claims 1-4 Suo Shu, wherein light beam is made up of a red laser, a blue laser and two green lasers.

27. according to the method one of Claims 1-4 Suo Shu, at least one light beam wherein said projects by flying-spot method.

28. for the device projecting at least one light beam, including:

Delay-level, can extend the persistent period that keeps of at least one picture point relative at least one other picture point at least in part by this delay-level；And

For improving the unit of contrast, the first information of at least one picture point wherein said can change according to the second information, and the first information of at least one picture point described is amenable to so that obtaining the second information when obtaining at least one follow-up picture point.

29. device according to claim 28, wherein can by delay-level according to the location of projection of corresponding picture point at least in part by the maintenance duration extension of at least one picture point.

30. device according to claim 29, including the digital/analog converter for encouraging at least one light beam described,

-wherein can drive digital/analog converter by fundamental clock,

-wherein can at least in part by the maintenance duration extension of at least one picture point, its mode is made by fundamental clock and can determine pixel clock, wherein can based on pixel clock by the maintenance duration extension of at least one picture point described.

31. device according to claim 30, wherein pixel clock corresponds to more than a times of the integer of fundamental clock.

32. according to the device one of claim 28 to 31 Suo Shu, wherein delay-level can encourage by pumping signal.

33. device according to claim 32, wherein said pumping signal is digital stimulus signal.

34. device according to claim 32, wherein delay-level includes sampling and keeps level and time-controlling arrangement, and wherein time-controlling arrangement controls sampling maintenance level by pumping signal.

35. according to the device one of claim 28 to 31 Suo Shu, the first information of at least one picture point wherein said changes during the duration of the projection of at least one picture point described.

36. according to the device one of claim 28 to 31 Suo Shu, wherein the first information includes the amplitude for showing at least one picture point described and/or brightness.

37. according to the device one of claim 28 to 31 Suo Shu, wherein the second information includes amplitude and/or the brightness of at least one follow-up picture point.

38. according to the device one of claim 28 to 31 Suo Shu, wherein obtain at least one follow-up picture point described and include one of following standard:

-when obtaining at least one follow-up picture point described, very recently or in the near future；

-obtain space that at least one follow-up picture point described is previously given stretch when, very recently or in the near future.

39. according to the device one of claim 28 to 31 Suo Shu, be provided with the memorizer at least one picture point, for the first information and second information of at least one picture point described are compared.

40. the device according to claim 39, wherein memorizer includes the sampling maintenance level of two alternative excitations.

41. according to the device one of claim 28 to 31 Suo Shu, it is provided with at least two digital/analog converter, described at least two digital/analog converter alternately encourages light beam, for the first information and second information of at least one picture point described being compared.

42. according to the device one of claim 28 to 31 Suo Shu, the first information of at least one picture point wherein said can change according to the second information, and its mode is to deduct from the persistent period of image the fall time needed for trailing edge in the end of at least one picture point described.

43. according to the device one of claim 28 to 31 Suo Shu, at least one light beam wherein said can be parameterized for making compensating image error.

44. device according to claim 43, by delay-level, the persistent period that keeps of each of at least one of which light beam is adjusted so that each of at least one light beam projects to corresponding in the region of the picture point being respectively associated.

45. according to the device one of claim 28 to 31 Suo Shu, the projection apparatus design wherein deflected is at least one light beam described of deflection partly.

46. device according to claim 45, the projection arrangement wherein deflected includes micro mirror.

47. device according to claim 46, wherein said micro mirror is two dimension resonance micro mirror.

48. according to the device one of claim 28 to 31 Suo Shu, at least one light beam wherein said is made up of at least one light source.

49. device according to claim 48, at least one light source wherein said includes at least one laser instrument.

50. device according to claim 49, at least one laser instrument wherein said is at least one laser diode.

51. according to the device one of claim 28 to 31 Suo Shu, wherein light beam is made up of a red laser, a blue laser and a green laser.

52. according to the device one of claim 28 to 31 Suo Shu, wherein light beam is made up of a red laser, a blue laser and two green lasers.

53. according to the device one of claim 28 to 31 Suo Shu, wherein said device projects at least one light beam described by flying-spot method.