CN102314055A - Laser signal modulation method - Google Patents
Laser signal modulation method Download PDFInfo
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- CN102314055A CN102314055A CN2010102153037A CN201010215303A CN102314055A CN 102314055 A CN102314055 A CN 102314055A CN 2010102153037 A CN2010102153037 A CN 2010102153037A CN 201010215303 A CN201010215303 A CN 201010215303A CN 102314055 A CN102314055 A CN 102314055A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
- H04N9/3135—Driving therefor
Abstract
The invention provides a laser signal modulation method, which adopts a mixed structure of PWM (pulse width modulation) and PAM (pulse amplitude modulation). A laser activity cycle is divided into N time units, so that laser energy can be output within the time of an nth time unit, wherein n is an integer between 1 and N. Meanwhile, the maximum effective output power of laser is divided into M power units, so that the effective output power of the laser with m power units can be provided, and m is an integer between 0 and M. Then, the total output power of the laser within the activity cycle is divided into M * N light energy units, m and n are determined according to total energy for display of the Rth color level, and R is an interger between 1 and M * N. Finally, the output energy within each light energy unit block is summed to provide the total energy for the display of the Rth color level.
Description
Technical field
The relevant a kind of laser signal modulating method of the present invention; Especially refer to a kind of employing PWM (pulse wave width modulation; PulseWidth Modulation) and PAM (pulse wave amplitude modulation; Pulse Amplitude Modulation) the laser signal modulating method of mixed architecture is applicable to imaging system or is used for the optical memory system that CD-RW discsCD-RW is write record with laser.
Background technology
Along with development in science and technology, various in recent years portable electronic devices are also more and more universal, though functional diversities and advantage easy to carry are arranged, do not have enough spaces on these compact electronic devices big screen is set.The little screen of building in seeing through, the user is quite arduous when browsing picture, let alone is to be used for reading electronic book or appreciation film.Therefore, have low power consuming, volume is little and the micro projection technology of advantage such as low cost is little by little attracted attention.In self, build the little screen, portable electronic devices of small can see through the micro projection technology look like to be presented on any plane of throwing image with the snapshot of oneself, does not need a fixing screen, therefore can let the user view and admire magnified image like a cork.Its range of application contain automobile/aircraft HUD (Head Up Display, HUD), satellite navigation system, intelligent mobile phone, PC, toy and other consumer electronics etc.
The micro projection technology can be divided into two types basically; First kind technology is with light emitting diode (light emittingdiode; LED) or laser be backlight, through the digital light treatment technology (digital light processing, DLP), liquid crystal display (liquid crystal display; LCD), grating (grating) or liquid crystal on silicon (liquid crystal onsilicon; LCoS) etc. display technique decides image, through lens this snapshot of oneself is looked like to enlarge in projection screen again, lets the audience inspect big image like a cork.Second type of technology then is laser scanning projection; At first the trichromatic laser beam of red/green/blue is carried out modulating signal; (Micro Electro MechanicalSystems, rotation minute surface MEMS) see through the direction after up and down deflection angle and high speed rotating changes the incident laser beam reflection then to utilize MEMS; Red/green/blue three look laser beams behind the modulation are scanned on screen fast, persist by human eye vision and form images.Correspond to first kind shadow casting technique, the luminous energy consumption of laser scanning projection's technology is lower, is about about 1/4th to 1/5th of first kind shadow casting technique.In addition, Color Laser Projection Technology is not to utilize focal imaging mechanism, therefore can show shadow appearance on irregular plane, when video picture, also need not adjust the image focal length.On the other hand, the framework of laser scanning projection technology is comparatively simple, on microminiaturization and production cost, all preponderates than first kind shadow casting technique.
Persist the time in human vision in (about 0.05 second), in some spaces, launch/reflect/the light gross energy of diffusion is proportional to the pairing color range in this space.For the technology of laser scanning projection's technology, the light gross energy of the specific basic coloured light (R, G, B) of certain pixel institute diffusion is proportional to total luminous energy of the Essential colour laser that is incident upon this pixel, that is is proportional at pixel period T
PIXELThe luminous power sum total of inner laser, pixel period (pixelperiod) T
PIXELRepresent laser beam to be incident upon the T.T. on some pixels.Generally can be at pixel period T
PIXELInterior red bluish-green three look laser to laser beam carry out modulation, by indivedual these trichromatic color ranges (colorlevel) that change, through the totalling of three primary colors laser, just can reach pixel color to be presented.
With reference to figure 1, it is a kind of dc laser modulating signal technology synoptic diagram in the prior art, and its transverse axis is the time, and the longitudinal axis is an output power, pixel period T
PIXELRepresent laser beam to be incident upon the T.T. on some pixels.In dc laser modulating signal technology, laser can provide different output power according to the color range that the pixel desire shows, yet at each pixel period T
PIXELIn, laser power is kept a particular value, the color range that this particular value promptly shows for the pixel desire.Therefore, a specific pixel cycle T in dc laser modulating signal technology
PIXELIn, the output energy of laser and the output valve of laser power are directly proportional.In the dc laser modulating signal technology of prior art, laser beam is with predetermined direction scanning neighboring pixel in regular turn, and therefore two neighbors are easy to generate color on the border and mix.
On the other hand; When using laser as the image light source; If projection screen comprises rough surface; When the laser beam irradiation of high same tone (coherent) was on thick behaviour's projection plane, reflection wave produced scattering in the time of can changing because of fine height, made the laser phase modulation randomly that projects screen.When these reflection waves arrive panadaptors (human eye), can form interference, strengthen randomly or weaken the image luminous point and produce the light and shade hot spot.This kind situation is called laser facula (laser speckle), can influence the quality of projected picture.When environment temperature makes a variation, the semiconductor laser merit amount output under the fixed current will make a variation thereupon, influence the accuracy of laser output power, cause color and brightness to depart from predetermined value easily, reduce the contrast (contrast ratio) of display frame.
Therefore; Concerning the system of laser scanning projection; In order to improve display quality and to reduce production costs; The needs that when design, have the degree of accuracy of raising laser power output valve, the uniformity coefficient that increases light intensity in the pixel and minimizing laser facula, and the present invention is promptly to the above-mentioned effective solution party's xun, one of the Eight Diagrams of proposition that needs.
Summary of the invention
Fundamental purpose of the present invention provides a kind of laser signal modulating method; Be a kind of employing PWM (pulse wave width modulation Pulse Width Modulation) and PAM (pulse wave amplitude modulation; Pulse Amplitude Modulation) the laser signal modulating method of mixed architecture; Be divided into N chronomere its cycle of activity with a laser so that laser can be exported energy in the time of a n chronomere, wherein n be between 1 and N between integer; Simultaneously, the maximum effective output of laser is divided into M power unit, makes laser that the effective output that comprises m power unit can be provided, wherein m be between 0 and M between integer; More the gross output of laser in a cycle of activity is divided into M * N luminous energy unit's square, and according to showing that the required gross energy of a R color range decides the value of this m and n, wherein R be between 1 and M * N between integer; At last, the output energy in each luminous energy unit's square of totalling shows the required gross energy of R color range to provide; By this, reach the effect that the degree of accuracy, the reduction frequency range that improve the laser power output valve required, increased the uniformity coefficient of light intensity in the pixel and reduce laser facula.
A purpose more of the present invention provides a kind of laser signal modulating method; Wherein when this laser applications during in the scanning projection video picture; More comprise: when laser scanning when closing between two pixels; Stop the energy output of this laser, promptly when scanning positions of laser during not near the frontier point of a pixel, this laser is exported energy to scan a pixel in a cycle of activity; Wherein when this scanning positions of laser during near the frontier point of a pixel, this laser promptly stops to export energy.More say it, with pixel period T
PIXELRepresent laser beam to be incident upon the T.T. on some pixels; When laser scanning projection's technology is applied to image; Because the color of each pixel desire performance is not quite similar; When same laser beam is crossed over two pixels of vicinity, produce color and mix, so laser beam is at pixel period T on the border
PIXELIn be not to open always, and can near pixel boundary point, laser beam be closed a period of time, this section shut-in time is with laser shutdown cycle (laser off period) T
OFFExpression.At each pixel period T
PIXELIn, the laser shutdown cycle T
OFFOutside time then be defined as laser cycle of activity (laser acting period) T
ONThe present invention is further in the laser shutdown cycle T
OFFThe color that stops to export to improve pixel boundary mixes, and adopts the framework of luminous energy square to control laser T cycle of activity simultaneously
ONInterior laser output.
In order to achieve the above object, the invention provides a kind of laser signal modulating method, comprise:
Be divided into N chronomere the cycle of activity of one laser, make this laser in the time of a n chronomere, export energy, wherein n be between 1 and N between integer;
The maximum effective output of this laser is divided into M power unit, makes this laser that the effective output that comprises m power unit can be provided, wherein m be between 0 and M between integer;
The gross output of this laser in this cycle of activity is divided into M * N luminous energy unit's square, and wherein the output energy that in each luminous energy unit's square, provided of this laser is decided by the length of a corresponding chronomere and the size of a corresponding power unit;
According to showing that the required gross energy of a R color range decides the value of m and n, and drive this laser according to this in the time of corresponding chronomere so that luminous energy unit's square of corresponding number to be provided, wherein R be between 1 and M * N between integer; And
Output energy in each luminous energy unit's square of totalling shows the required gross energy of this R color range to provide.
During enforcement, the equal in length of each chronomere in this N chronomere.
During enforcement, the equal and opposite in direction of each power unit in this M power unit.
During enforcement, laser signal modulating method of the present invention more comprises:
Provide a current source to drive this laser, wherein the frequency range of this current source is enough to drive this laser provides m power unit in each chronomere of N chronomere effective output, wherein m be between 0 and M between integer.
During enforcement, laser signal modulating method of the present invention more comprises:
One first current source is provided, and wherein the frequency range of this first current source is enough to drive this laser provides m power unit simultaneously in each chronomere of N chronomere effective output, wherein m be between 0 and M between integer;
One second current source is provided, and wherein the frequency range of this second current source is enough to drive this laser provides 1 group of effective output value in a time unit, and wherein this group effective output comprises 1 power unit; And
This first and second current source is according to showing that the required gross energy of this R color range drives this laser.
During enforcement, laser signal modulating method of the present invention, other comprises:
Many group current sources are provided; The frequency range that should organize i group current source in the current sources is enough to drive this laser and exports Ai * Bi luminous energy unit's square of Si group with the mode of Bi power unit of output in the time of Ai chronomere more; Wherein Ai be between 0 and M between integer, and N/Bi is an integer;
Open the current source of a given number in these many group current sources according to showing the required gross energy of this R color range; And
The drive current that current source provided of this given number of totalling is to drive this laser.
During enforcement, the output signal of these many group current sources is synchronous.
During enforcement, the output signal of these many group current sources is non-fully synchronously, makes the output signal between these many group current sources have different time to postpone mutually.
During enforcement, laser signal modulating method of the present invention more comprises:
Drive this laser so that initial part that should cycle of activity and the luminous energy unit square number that central part comprised of the luminous energy unit's square number that stops partly being comprised more than this cycle of activity.
During enforcement, laser signal modulating method of the present invention more comprises:
Drive this laser so that difference that should luminous energy unit's square number that two adjacent chronomeres are comprised in cycle of activity greater than a predetermined value.
During enforcement, when this laser applications during in the scanning projection video picture, said laser signal modulating method more comprises:
When laser scanning when closing between two pixels, stop the energy output of this laser, wherein with pixel period T
PIXELRepresent laser beam to be incident upon the T.T. on the pixel, when laser beam at a pixel period T
PIXELIn open but can near this pixel boundary point, laser beam be closed a period of time with the laser shutdown cycle T
OFFExpression, and at each pixel period T
PIXELInner laser is closed cycle T
OFFOutside time with laser T cycle of activity
ONExpression makes laser in the laser shutdown cycle T
OFFThe color that stops to export to improve pixel boundary mixes.
During enforcement, this chronomere is a pulse.
Compared with prior art, laser signal modulating method of the present invention can reduce the number of stages of laser power, thereby reduces the requirement to this laser power output valve precision.The present invention also can reduce at pixel period T
PIXELIn required signal change frequency, therefore reduce frequency range requirement to laser.In PWM/PAM laser signal modulating method of the present invention, each pixel period T
PIXELBut in elasticity adjustment laser power size or pulse bandwidth, see through and change at pixel period T
PIXELIn total optical power reach the color range of target.
Description of drawings
Fig. 1 is a direct current laser signal modulation tech synoptic diagram in the prior art;
Fig. 2 is an imaging synoptic diagram of the present invention;
Fig. 3 is for adopting the laser signal modulating method synoptic diagram of PAM among the present invention;
Fig. 4 is for adopting the laser signal modulating method synoptic diagram of PWM among the present invention;
Fig. 5 is a kind of laser signal modulating method synoptic diagram that uses PNM among the present invention;
Fig. 6 is for adopting the laser signal modulating method synoptic diagram of PWM/PAM framework among the present invention;
Fig. 7 A-Fig. 7 B is that PWM/PAM laser signal modulating method of the present invention shows specific color range synoptic diagram;
Fig. 8 is a first embodiment of the present invention synoptic diagram;
Fig. 9 A-Fig. 9 C is the second embodiment of the invention synoptic diagram;
Figure 10 is the third embodiment of the invention synoptic diagram;
Figure 11 A-Figure 11 D is that third embodiment of the invention shows specific color range synoptic diagram;
Figure 12 is the fourth embodiment of the invention synoptic diagram;
Figure 13 is the fifth embodiment of the invention synoptic diagram;
Figure 14 is the sixth embodiment of the invention synoptic diagram;
Figure 15 adopts the impulse form synoptic diagram for the present invention;
Figure 16 is the seventh embodiment of the invention synoptic diagram.
Description of reference numerals: T
PIXEL-pixel period; T
OFF-laser shutdown the cycle; T
ON-laser cycle of activity; The maximum effective output of Pmax-; TP-maximum laser cycle of activity.
Embodiment
With reference to figure 2, it is a synoptic diagram when utilizing the imaging of laser signal modulating method of the present invention, and its transverse axis is the time, and the longitudinal axis is an output power.Under the situation of the output size of not considering laser, pixel period T
PIXELRepresent laser beam to be incident upon the T.T. on some pixels.When laser scanning projection's technology is applied to show image,, when same laser beam is crossed over two pixels of vicinity, produce color and mix, so laser beam is at pixel period T on the border because the color of each pixel desire performance is not quite similar
PIXELIn be not to open always, and can near pixel boundary point, laser beam be closed a period of time, this section shut-in time is by laser shutdown cycle (laser off period) T
OFFRepresent.At each pixel period T
PIXELIn, the laser shutdown cycle T
OFFOutside time then be defined as laser cycle of activity (laser acting period) T
ONThe present invention is in the laser shutdown cycle T
OFFThe color that stops to export to improve pixel boundary mixes, and adopts the framework of luminous energy square to control the laser output in laser TON cycle of activity simultaneously.
Fig. 3 is for adopting the laser signal modulating method synoptic diagram of PAM (Pulse Amplitude Modulation, pulse wave amplitude modulation) among the present invention; Wherein, laser can provide different output power according to the color range that the pixel desire shows, yet at each laser T cycle of activity
ONIn, laser power is kept a particular value, the color range that this particular value promptly shows for the pixel desire.On the other hand, each laser T cycle of activity
ONLength fix, can not change with the color range of pixel.Therefore, in the PAM laser signal modulating method of the present invention, at specific laser T cycle of activity
ONIn, the light energy output of laser and the output valve of laser power are directly proportional.
Fig. 4 is for adopting the laser signal modulating method synoptic diagram of PWM (Pulse Width Modulation, pulse wave width modulation) among the present invention; Wherein, all laser T cycle of activity
ONLaser power is all a fixed value, can not change with the color range of pixel.On the other hand, at each laser T cycle of activity
ONPulse bandwidth then decide by the color range that the pixel desire shows.Therefore, in the M laser signal modulating method of the present invention, at specific laser T cycle of activity
ONIn, the output energy and the pulse bandwidth of laser are directly proportional.
Fig. 5 is for adopting the laser signal modulating method synoptic diagram of pulse wave quantity modulation (PNM, Pulse Number Modulation) among the present invention; Wherein, each laser T cycle of activity
ONIn can produce the pulse wave that output power value and pulse bandwidth all equate, the pulse wave number then decides according to the color range of pixel desire demonstration.Therefore, in the PNM laser signal modulating method of the present invention, at specific laser T cycle of activity
ONIn, the light output energy and the pulse wave number of laser are directly proportional.
In order to reduce system's frequency range requirement, to increase the uniformity coefficient of light intensity in the pixel, and reduce laser facula, the present invention adopts the framework of luminous energy square to control laser T cycle of activity
ONInterior laser output driving laser.With reference to figure 6, it is the laser signal modulating method synoptic diagram of an employing PWM/PAM mixed architecture among the present invention, and it is presented at laser T cycle of activity of laser
ONThe performance plot of interior luminous power-time; Wherein, The longitudinal axis is represented output power of laser, is divided into the prime power unit into M, and M group different output power value can be provided; Wherein m group output power comprise a m prime power unit (m be between 0 and M between integer), and the maximum effective output that comprises a M prime power unit is represented with Pmax.Transverse axis is represented the cycle, is divided into to be N basic time unit.Laser can provide a specific output power value in a specific output cycle; The totalling equal in length of the length in this a specific output cycle and n basic time unit (n be between 1 and N between integer); This specific output power value is the sum total of a m prime power unit, and laser T cycle of activity
ONLength represent with Tp.Therefore, at laser T cycle of activity
ONIn the performance plot of luminous power-time can describe by the matrix that R base unit square formed, wherein R is between 0 and (integer between the M * N), the required color range number of reaching of represent pixel.In the embodiment shown in fig. 6, the value of each prime power unit is all Pmax/M, and the length of each basic time unit is all Tp/N, so each basic luminous energy square is all corresponding to identical luminous energy, at this laser T cycle of activity
ONThe quantity sum total of middle luminous energy unit square is promptly corresponding to this pixel color range to be presented.For convenience of description, can embodiments of the invention be described with the trellis power profile shown in similar Fig. 6 in the instructions subsequent content.
When PWM/PAM hybrid laser modulating signal mode shown in Figure 6 was applied in one 256 color range display systems, the 1st color range was equivalent at whole laser T cycle of activity
ONMiddle laser is all zero luminous power output, and R color range then is equivalent to output (R-1) individual luminous energy unit square in whole laser TON cycle of activity.With M=8; The 256 color range systems of N=32 are example; The 32nd color range can be appeared by any laser output signal that occupies 31 luminous energy unit's squares in the trellis power profile; For example shown in Fig. 7 A and Fig. 7 B, because N is proportional to the laser and the required frequency range of reaching of driving circuit of modulating signal mode, the demand frequency range of N must be less than laser and the operable frequency range of driving circuit.Simultaneously; At the color range number that requires is under the situation of R, selects bigger N then can reduce M, and makes the poor Tp/M of each stratum of laser power become big; Thereby be reduced in color range when control to laser power requirement accurately, therefore can enlarge the valid function temperature range of this optical projection system.
The present invention can adopt different circuit frameworks to realize the trellis power profile shown in Fig. 6.With reference to figure 8, it adopts the laser signal modulating method first embodiment synoptic diagram of PWM/PAM mixed architecture for the present invention.This first embodiment uses single current source to come driving laser; The frequency range of this current source can make laser that the output power of 0～Pmax was provided in the time of length T p/N, and its maximum scan electric current (sweep current) is Imax (drive current when laser power is output as Pmax).See through to change the sweep current value of current source, M group different output power (m/M) * Pmax that laser can provide in the time of each output cycle T p/N to be to reach luminous energy unit's square of varying number, wherein m be between 0 and M between integer.With M=8, the 256 color range systems of N=32 are example, the 134th color range can by the laser signal that occupies 133 luminous energy unit's squares in the trellis power profile export appear as shown in Figure 8.
With reference to figure 9A-9C, it is respectively the laser signal modulating method second embodiment synoptic diagram that the present invention adopts the PWM/PAM mixed architecture.This second embodiment uses two current sources to come driving laser: wherein the sweep current of first group of current source can become in time; Its frequency range can make laser in the time of length T p, can export M group different output power (m/M) * Pmax so that luminous energy unit's square of varying number to be provided, wherein m be between 0 and (M-1) between integer.Wherein the sweep current of second group of current source does not become in time, and its frequency range can make laser exports fixed value Pmax/M in the time of length T p/N luminous power so that luminous energy unit's square of varying number to be provided.256 color range systems with M=8 and N=32 are example, when realizing the 134th color range, need produce 133 basic luminous energy squares, and wherein 4x32 basic luminous energy square can be produced by first group of driven with current sources, and its luminous power-time response figure is shown in Fig. 9 A; Other 5 basic luminous energy squares are then produced by second group of current source, and its luminous power-time response figure is shown in Fig. 9 B.Two current sources are added general provisions 133 basic luminous energy squares capable of using realize the 134th color range, the luminous power-time response figure that adds the General Logistics Department is shown in Fig. 9 C.The product maximum of frequency range that second embodiment of the invention is required and sweep current is merely (N/Tp) * (Imax/M), so expense is lower.
With reference to Figure 10, it adopts laser signal modulating method the 3rd embodiment synoptic diagram of PWM/PAM mixed architecture for the present invention, and this 3rd embodiment uses many group current sources to come driving laser, and frequency range of each group current source has nothing in common with each other.To use S group current source to be example; The frequency range of i group current source is enough to make laser in the time span of (N/Bi)/Tp, to produce the luminous power of 0～(Ai/M) Pmax; Wherein i is the arbitrary integer between 1 to S; Ai is the arbitrary integer between 0 to M, and Bi is the arbitrary integer of integer for making N/Bi, and therefore the value of (N/Bi)/Tp can be less than the value of base unit frequency range N/Tp.Sweep current of each group current source does not change in time, but its maximum scan electric current has nothing in common with each other, and wherein the sweep current of i group current source can make laser output reach the luminous power of (Ai/M) Pmax, and wherein Ai is the arbitrary integer between 0 to M.If all current sources all drive with the maximum scan electric current, the output power of totalling is to I haven't seen you for ages greater than the suitable maximum luminous power Pmax that exports of laser, that is ∑ Si=1 (Ai/M) Pmax >=Pmax.Therefore, third embodiment of the invention utilizes switch to control the output of each current source, and (si * Ai/M) value of Pmax is controlled between 0 to Pmax: when si=1, i group current source can be unlocked also to be about to the gross output ∑ Si=1 that adds of S group current source; When si=0, i group current source can be closed.
Therefore, i group current source can produce integer group (N/Bi group) Ai * Bi basic luminous energy square, and third embodiment of the invention utilizes switch to control the output (si=1 or si=0) of S group current source.When being applied in one M * N color range system; The color range that shows according to the pixel desire decides several groups of Ai * Bi of output basic luminous energy squares; The total number ∑ Si=1ai * Ai * Bi that adds that makes S group current source export basic luminous energy square is 0 to the (arbitrary integer of M * N-1); Wherein ai is the arbitrary integer between 0 to N/Bi, therefore can utilize the required any color range of the total incompatible realization of electric current of this S group current source.Explain that with 256 color range systems suppose to select M=8 and N=32, the value of each prime power unit is Pmax/8, the value of each basic time unit is Tp/32, so the energy of each basic luminous energy square is (Pmax * Tp)/256.Third embodiment of the invention uses in the S group current source wherein that three groups of current sources come driving laser, select simultaneously (A1, B1)=(4,4), (A2, B2)=(3,2) and (A3, B3)=(1,1).In other words, the sweep current of first group of current source can make laser produce the luminous power of (1/2) * Pmax, and its frequency range is 8/Tp, that is the output cycle is Tp/8; The sweep current of second group of current source can make laser produce the luminous power of (3/8) * Pmax, and its frequency range is 16/Tp, that is the output cycle is Tp/16; The sweep current of the 3rd group of current source can make laser produce the luminous power of (1/8) * Pmax, and its frequency range is 32/Tp, that is the output cycle is Tp/32.On the other hand; First group of current source can provide 0 or 16 basic luminous energy square number respectively in 8 output cycles (length T p/8); Second group of current source can provide 0 or 6 basic luminous energy square number respectively in 16 output cycles (length T p/16); The 3rd group of current source can provide 0 or 1 basic luminous energy square number respectively in 32 output cycles (length T p/32), the maximum basic luminous energy square number that a current source can provide in an output cycle is all indicated by the bold line among Figure 10.At laser T cycle of activity
ONIn; Suppose that first group of current source export 16 basic luminous energy square numbers of a1 group (a1 is the arbitrary integer between 0 to 8) altogether; Second group of current source exported 6 basic luminous energy square numbers of a2 group (a2 is the arbitrary integer between 0 to 16) altogether; And the 3rd group of current source exported a3 basic luminous energy square number (a3 is the arbitrary integer between 0 to 32) altogether, and seeing through these three groups of current sources of totalling can be at pixel period T
PIXELInterior output (16a1+6a2+a3) individual basic luminous energy square number.See through and select suitable a1, a2 and a3, the sum total of these three groups of current sources can be at pixel period T
PIXELMiddle 0 basic luminous energy square to 255 of construction unit luminous energy square therefore just can be at laser T cycle of activity
ONIn present 256 color ranges.
With reference to figure 11A-11D, it is respectively the specific color range synoptic diagram of a demonstration in the third embodiment of the invention.Explain with one 256 color range systems once more, select M=8 and N=32 equally, and use three groups of current sources to come driving laser.Suppose that the pixel desire shows the 134th color range, these three groups of current sources are at laser T cycle of activity
ONThe basic luminous energy square sum 16a1+6a2+a3 that is exported is required to be 133, can see through (a1, a2, a3)=(8,0,5), (4,11,3) or combinations such as (3,9,31) reach.Suppose to select (a1; A2, a3)=(3,9; 31); Luminous power-time response the figure of first, second and third group current source is respectively shown in Figure 11 A, Figure 11 B, Figure 11 C, and therefore luminous power-time response figure that these three groups of current source totallings are caused can present the 134th color range in this laser TON cycle of activity shown in Figure 11 D.
As previously mentioned, the interference of same tone laser can cause laser facula, more concentrates when the luminous energy of laser, and laser facula is got over to remarkable.If will reduce laser facula, wherein a kind of mode is to reduce the same tone of laser beam.When the signal frequency of driving laser heals when high, the resonant condition in the laser also changes fast, thereby shortens the temporary transient people having the same aspiration and interest cycle (temporal coherence period) of laser, and the frequency range that increases laser is to suppress laser facula.
Fourth embodiment of the invention synoptic diagram with reference to Figure 12.This 4th embodiment and the 3rd embodiment are similar; The same S group current source that uses comes driving laser; But the output signal of respectively organizing current source among the 3rd embodiment is for synchronously; And the output signal of respectively organizing current source among this 4th embodiment is not fully synchronously, that is can have different time to postpone between each current source mutually.Explain with one 256 color range systems equally, select M=8 and N=32, and use three groups of current sources to come driving laser to show the 134th color range; When not considering time delay, the luminous power-time response figure of single current source is respectively shown in Figure 11 A～Figure 11 C.Yet; In three groups of current sources of this 4th embodiment; The output that the output of supposing second group of current source lags behind first group of current source has the time of Tp/ (3xN); The output that the output of the 3rd group of current source lags behind second group of current source has the time of Tp/ (3xN), and is then that the luminous power-time response figure of three groups of current source totalling rear drive laser gained is shown in figure 12.Compared to laser T cycle of activity shown in Figure 11 D
ON, laser T cycle of activity shown in Figure 12
ONMany time spans of (2xTp)/(3xN) are as long as laser T cycle of activity
ONStill less than pixel period T
PIXEL, pixel period T then
PIXELInterior total luminous energy can't be organized the asynchronous of current source and change because of each, therefore can not influence the control to color range.On the other hand, Laser Driven frequency shown in Figure 12 is three times in the Laser Driven frequency shown in Figure 11 D, therefore can reduce the same tone of laser beam, reduces laser facula.
Fifth embodiment of the invention synoptic diagram with reference to Figure 13.Explain with one 256 color range systems equally, select M=8 and N=32, Figure 13 shows the 134th luminous power-time response figure that color range is required.This 5th embodiment uses radio-frequency signal to come driving laser, makes the high randomness of laser output power tool, therefore can reduce laser facula effectively.This 5th embodiment can adopt the framework of first embodiment, utilizes single current source in the adjacent output cycle (length T p/N), to provide and changes great drive current, so that the characteristic of laser output power is shown in figure 13.In addition; This 5th embodiment also can adopt the framework of the 3rd embodiment; After suitably selecting current source number and parameters, utilize many group current sources in the adjacent output cycle (length T p/N), to provide and change great drive current, so that the characteristic of laser output power-time is shown in figure 13.
Diverse location was had nothing in common with each other by the time of laser beam scanning in the same pixel, was example with α, β, the γ point shown in Fig. 3 top, and the time that the α point is throwed is worked laser T cycle of activity that makes in a pixel
ONDuring beginning, and the left side edge that ends at the laser beam luminous point is left the α point.The time that the β point is throwed rises and makes when the right side edge of laser beam luminous point contact β point, and the left side edge that ends at the laser beam luminous point is left the β point.The time that the γ point is throwed rises and makes when the right side edge contact γ of laser beam luminous point point, and ends at laser T cycle of activity of this pixel
ONTherefore when closing, can know the time that β point (pixel central authorities) was throwed by laser beam greater than α point and γ point (pixel edge) by the time of laser beam projection.Suppose the luminous point tool equality strength of laser beam, because PAM laser signal modulating method is at laser T cycle of activity
ONOutput power keep a fixed value, so the light intensity that the observer experiences a location point will be proportional to the time that laser beam is incident upon this location point.In other words, the observer will experience the light intensity of the light intensity of pixel central authorities greater than pixel edge.In addition, the laser spot in fact luminous power in central authorities is stronger, the luminous power at luminous point edge a little less than, so pixel in the uneven phenomenon of light intensity can be more obvious.If can be at laser T cycle of activity
ONStarting point and terminating point near distribute higher optical power density, at laser T cycle of activity
ONCentral part distribute lower optical power density, so just can increase light uniformity coefficient in the pixel.If can light intensity be dispersed in the pixel out of the ordinary more uniformly, not only can make picture comparatively natural, also can reduce the phenomenon of laser facula.
Sixth embodiment of the invention synoptic diagram with reference to Figure 14.Explain with one 256 color range systems that equally select M=8 and N=32, Figure 14 shows the 134th luminous power-time response figure that color range is required.This 6th embodiment is at laser T cycle of activity
ONStarting point and terminating point near distribute luminous energy unit's square of comparatively dense, and at laser T cycle of activity
ONCentral part distribute more sparse luminous energy unit's square, therefore can improve because of sweep time length difference and laser beam energy inequality in pixel, cause the uneven situation of light intensity.This 6th embodiment can adopt the first embodiment framework, and utilizing single current source to export the cycle in difference provides the different driving electric current in (length T p/N), and the luminous power-time of laser this moment is shown in figure 14.In addition, this 6th embodiment also can adopt the 3rd embodiment framework, after suitably selecting current source number and parameters, utilizes many group current sources that the different driving electric current was provided in the difference output cycle, so that the characteristic of the luminous power-time of laser is shown in figure 14.
If utilize nonlinear crystal to produce the laser power of tool specific wavelength, then in the specific light power bracket, the wavelength conversion efficiency of nonlinear crystal is proportional to the laser power of incident.The act green laser is an example; If the laser of about 1064 nanometers of wavelength is injected potassium titanium oxide phosphate (Potassium Titanyl Phosphate; KTiOPO4/KTP) or behind the lithium niobate nonlinear crystals such as (Lithium Niobate), with the laser that converts about 532 nanometers of wavelength into.Under this situation, use the pulsed laser beam of wavelength narrower (about 1064 nanometers), can obtain higher wavelength conversion efficiency, that is obtain onesize green glow luminous energy with less electrical energy consumption.On the other hand, come modulation laser, can obtain bigger moment luminous power usually with impulse form.
Adopt the laser signal modulating method synoptic diagram of impulse form PWM/PAM mixed architecture with reference to Figure 15 the present invention, when it shows with the impulse form modulation at laser T cycle of activity of laser
ONThe performance plot of interior luminous power-time; The longitudinal axis is represented output power of laser; Be divided into a prime power unit for M; M group different output power value can be provided, wherein m group output power comprise a m prime power unit (m be between 0 and M between integer), and the maximum effective output that comprises a M prime power unit is represented with Pmax '.Transverse axis is represented the cycle, is divided into the basic pulse unit into N, and laser can provide a specific output power value in each basic pulse unit, and laser T cycle of activity
ONLength represent with Tp.Therefore, at laser T cycle of activity
ONIn the performance plot of luminous power-time can describe by the matrix that R base unit square formed, wherein R is between 0 and (integer between the M * N), the required color range number of reaching of represent pixel.In the embodiment shown in fig. 15, the value of each prime power unit is all Pmax '/M, each basic pulse unit's tool equal length, so each basic luminous energy square is all corresponding to identical luminous energy, at this laser T cycle of activity
ONThe quantity sum total of middle luminous energy unit square is promptly corresponding to this pixel color range to be presented.
Because laser system is with the impulse form modulation; Therefore the maximum effective output Pmax ' of the laser of Figure 15 is greater than the maximum effective output Pmax of the laser of Fig. 6; But see through the wavelength Conversion that combines aforementioned nonlinear crystal, then can less electrical energy consumption obtain onesize laser light energy.Simultaneously, need higher frequency range during with impulse form modulation laser, therefore can reduce the same tone of laser beam, reduce the situation of laser facula.
Similar with the PWM/PAM laser signal modulating method of Fig. 6, Fig. 7-each embodiment shown in Figure 14 also can be applicable to impulse form PWM/PAM laser signal modulating method shown in Figure 15, only lifts wherein an example at this and explains.Adopt the laser signal modulating method synoptic diagram of impulse form PWM/PAM framework with reference to Figure 16 seventh embodiment of the invention.Can realize similar luminous power-time response figure shown in Figure 14 among this 7th embodiment, except seeing through at laser T cycle of activity
ONDifferent time points distribute different optical power densities to increase light uniformity coefficient in the pixel, also can see through impulse form modulation laser simultaneously to reduce the same tone of laser beam, reduce the situation of laser facula.
Compared to the laser signal modulation tech of prior art, the present invention can reduce the number of stages of laser power, thereby reduces the requirement to this laser power output valve precision.The present invention also can reduce at pixel period T
PIXELIn required signal change frequency, therefore reduce frequency range requirement to laser.In PWM/PAM laser signal modulating method of the present invention, each pixel period T
PIXELBut in elasticity adjustment laser power size or pulse bandwidth, see through and change at pixel period T
PIXELIn total optical power reach the color range of target.
More than shown in be merely the preferred embodiments of the present invention, only be illustrative for the purpose of the present invention, and nonrestrictive.The common intelligence the knowledgeable of tool understands in this area, in spirit that patent of the present invention requires to be limited and scope, can carry out many changes to it, revise, even equivalence changes, but all will fall in protection scope of the present invention.
Claims (12)
1. a laser signal modulating method is characterized in that, comprises:
Be divided into N chronomere the cycle of activity of one laser, make this laser in the time of a n chronomere, export energy, wherein n be between 1 and N between integer;
The maximum effective output of this laser is divided into M power unit, makes this laser that the effective output that comprises m power unit can be provided, wherein m be between 0 and M between integer;
The gross output of this laser in this cycle of activity is divided into M * N luminous energy unit's square, and wherein the output energy that in each luminous energy unit's square, provided of this laser is decided by the length of a corresponding chronomere and the size of a corresponding power unit;
According to showing that the required gross energy of a R color range decides the value of m and n, and drive this laser according to this in the time of corresponding chronomere so that luminous energy unit's square of corresponding number to be provided, wherein R be between 1 and M * N between integer; And
Output energy in each luminous energy unit's square of totalling shows the required gross energy of this R color range to provide.
2. laser signal modulating method as claimed in claim 1 is characterized in that, the equal in length of each chronomere in this N chronomere.
3. the method for claim 1 is characterized in that, the equal and opposite in direction of each power unit in this M power unit.
4. laser signal modulating method as claimed in claim 1 is characterized in that it more comprises:
Provide a current source to drive this laser, wherein the frequency range of this current source is enough to drive this laser provides m power unit in each chronomere of N chronomere effective output, wherein m be between 0 and M between integer.
5. laser signal modulating method as claimed in claim 1 is characterized in that it more comprises:
One first current source is provided, and wherein the frequency range of this first current source is enough to drive this laser provides m power unit simultaneously in each chronomere of N chronomere effective output, wherein m be between 0 and M between integer;
One second current source is provided, and wherein the frequency range of this second current source is enough to drive this laser provides 1 group of effective output value in a time unit, and wherein this group effective output comprises 1 power unit; And
This first and second current source is according to showing that the required gross energy of this R color range drives this laser.
6. laser signal modulating method as claimed in claim 1 is characterized in that it comprises in addition:
Many group current sources are provided; The frequency range that should organize i group current source in the current sources is enough to drive this laser and exports Ai * Bi luminous energy unit's square of Si group with the mode of Bi power unit of output in the time of Ai chronomere more; Wherein Ai be between 0 and M between integer, and N/Bi is an integer;
Open the current source of a given number in these many group current sources according to showing the required gross energy of this R color range; And
The drive current that current source provided of this given number of totalling is to drive this laser.
7. laser signal modulating method as claimed in claim 6 is characterized in that, the output signal of these many group current sources is synchronous.
8. laser signal modulating method as claimed in claim 6 is characterized in that, the output signal of these many group current sources is non-fully synchronously, makes the output signal between these many group current sources have different time to postpone mutually.
9. laser signal modulating method as claimed in claim 1 is characterized in that it more comprises:
Drive this laser so that initial part that should cycle of activity and the luminous energy unit square number that central part comprised of the luminous energy unit's square number that stops partly being comprised more than this cycle of activity.
10. laser signal modulating method as claimed in claim 1 is characterized in that it more comprises:
Drive this laser so that difference that should luminous energy unit's square number that two adjacent chronomeres are comprised in cycle of activity greater than a predetermined value.
11. laser signal modulating method as claimed in claim 1 is characterized in that, when this laser applications during in the scanning projection video picture, said laser signal modulating method more comprises:
When laser scanning when closing between two pixels, stop the energy output of this laser, wherein with pixel period T
PIXELRepresent laser beam to be incident upon the T.T. on the pixel, when laser beam at a pixel period T
PIXELIn open but can near this pixel boundary point, laser beam be closed a period of time with the laser shutdown cycle T
OFFExpression, and at each pixel period T
PIXELInner laser is closed cycle T
OFFOutside time with laser T cycle of activity
ONExpression makes laser in the laser shutdown cycle T
OFFThe color that stops to export to improve pixel boundary mixes.
12. laser signal modulating method as claimed in claim 1 is characterized in that, this chronomere is a pulse.
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Application publication date: 20120111 |