CN106371275B - A kind of laser projection carrying out time sequential pulse compensation to light source - Google Patents
A kind of laser projection carrying out time sequential pulse compensation to light source Download PDFInfo
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Abstract
The invention discloses a kind of laser projections carrying out time sequential pulse compensation to light source, including multiple monochromatic laser light sources, receive the imaging unit of each monochromatic laser light source emergent light, and the time sequential pulse control circuit of the first pulse signal is provided to the driving circuit sequential of each monochromatic laser light source, the monochromatic laser light source includes at least three different primary light sources, and the operating current that the first pulse signal control laser drive circuit is loaded into corresponding one-wavelength laser pipe is more than the rated current of the monochromatic laser light source；Light source unit of the present invention using multiple monochromatic laser light source time cooperations as projection, it is loaded into the electric current on each laser tube by the compensation of time sequential pulse control circuit, it is more than its rated current to make the electric current being loaded on laser tube, to effectively improve the utilization rate of light, heat dissipation effect can also be improved, and then can be with the brightness of projecting apparatus.
Description
Technical field
The present invention relates to projector apparatus technical field, more particularly to a kind of laser carrying out time sequential pulse compensation to light source
Projector.
Background technology
Existing projector mostly or using light bulb as light source, mainly have high intensity discharge light source, short arc hernia lamp,
Metal halid lamp etc., a small amount of using " solid state light emitter " SSI (including LED light source and laser light source), part of the manufacturer also releases at present
Laser light source replaces the projection device of light bulb, wherein mainly using monochromatic laser light source technology.
Semiconductor laser is main that DLP shadow casting techniques, DLP projector is still used to divide monolithic DLP and 3 as illuminating source
2 kinds of piece DLP projector.Single DLP projector is in light source using above there is 2 kinds of modes.One is white light source list DLP projectors, separately
One is 3 color LED light source list DLP projectors of red, green, blue.
A piece of dmd chip is only installed inside monolithic DLP projector in white light list DLP projector, metal can be used in light source
Tri- colors of REG that the white light or new light sources (such as LED light) that halogen lamp, ultrahigh pressure mercury lamp are sent out are sent out.Using the list of white light source
Piece DLP projector generates REG three-color color wheels by installing a colour wheel between light source and DMD.Colour wheel is typically divided into four
Region：Red sector, Green Zone, blue area and one are used for increasing the transparent region of brightness.Since transparent region can weaken the saturation of color
Degree, so may be disabled in the projecting apparatus of certain model or simply dispensing.In the course of work, dmd chip and color
The rotation of wheel keeps synchronizing, in this way, when blue portion is located at before light source in colour wheel, DMD just shows blue in picture
Part.It is red also very similar with the situation of green.Three kinds of pictures of red, green, blue are thrown with very high speed in sequence
It shoots out, therefore observer can see " full color " picture of synthesis.In the model of early stage, a frame picture is often shown,
Colour wheel only rotates a circle.In the model in later stage, colour wheel according to frame rate two to three times rotate, wherein there are also models simultaneously
Color region on colour wheel is repeated twice, it means that redgreenblue sequence image will repeat six times among a frame.
3 color list DLP projector of red, green, blue is then LED or the conduct throwing of lasing fluorescence pipe for using RGB color base color
The light source of shadow machine, the patent document of application publication number CN 102520568A disclose a kind of DMD using laser light source project it is aobvious
Show system, each monochromatic source lighted by the control of DLP control systems using at least three laser light sources containing 3 primary colours,
Make to project the light on DMD, just as the light of the different color of colour wheel rotation generation, these light are anti-by DMD's
It penetrates, on the screen composite projection's image.This control mode can utilize an end PWM of laser light source control device MCU
Mouthful, simulation generates colour wheel and feeds back waveform, as long as the waveform is synchronous with the colour wheel rotation simulated, so that it may with as traditional UHP light
Source optical projection system equally obtains correct image.Above-mentioned apparatus is reduced by the use of three color laser light sources to special-purpose software
The dependence of system and device makes the popularization of laser light source become more convenient and easy, reduces system cost.
But either all there is a problem of that light utilization efficiency is low using monochromatic or three colors laser light source, using colour wheel
Single DLP projector, when passing through colour wheel, can only be corresponding color can pass through white light, and other colors can not just pass through, by
In white light be by red, green, blue, 3 colour cells at therefore the utilization rate of its light can only be 33% or so；Three color list DLP projectors, though
So without colour wheel, but its operation principle is still 3 coloured light and opens the light successively, i.e., when a kind of color shines, in addition 2 colors are not
Luminous, it is seen that the light utilization efficiency of single DLP projector also only has 33% or so.And the energy not utilized will be converted to heat
Amount, and heat can cause to seriously affect to the work of the portions such as chip of projector piece, therefore heat dissipation problem is always projector
Main bugbear.
Invention content
The present invention provides a kind of laser projections carrying out time sequential pulse compensation to light source, are carried by timing compensation circuit
The utilization rate of high each laser light source, to effectively improve the projection brightness of projector, while also big positive width subtracts the heat generated
Few, the requirement to cooling system is also substantially lowered, and cost has been saved, extend the service life of equipment.
A kind of laser projection carrying out time sequential pulse compensation to light source, including multiple monochromatic laser light sources, receive each list
The imaging unit of color laser light source emergent light, and provide the first pulse signal to the driving circuit sequential of each monochromatic laser light source
Time sequential pulse control circuit, the monochromatic laser light source includes at least three different primary light sources, first pulse letter
Number control laser drive circuit be loaded into corresponding one-wavelength laser pipe operating current be more than the monochromatic laser light source rated current.
The laser tube of monochromatic laser light source shine be by being determined by the electric current on laser tube, in the present invention, work
It is the voltage change by being loaded on laser tube as electric current, to change the size of electric current.Therefore time sequential pulse control circuit
There are two major functions：1) it realizes and exports multiple adjustable first pulse signals of voltage amplitude；2) this multiple first pulse signal
Between meet certain sequential relationship.
Laser tube luminous intensity is by being determined by the electric current on laser tube, being compensated by the electric current on laser tube
It improves the luminous intensity of laser tube, improves the electric current being loaded on laser tube, be larger than rated current, realize that sequential is mended
Repay, resulting direct result be exactly each monochromatic source 1/3 (will set there are three monochromatic laser light source) it is luminous when
In, luminance improves.After light utilization efficiency is promoted, being converted to the light of heat just becomes seldom, therefore the heat dissipation of entire machine
System has also obtained good improvement.
The theory that light emission luminance improves is as follows：Radiation flux (Φ e) be defined as in the unit interval in the form of radiation transmitting,
Transmission or the power received, in practical application, for continuous radiation body or receiving body, with the radiation energy in the unit interval, i.e. spoke
Penetrate flux expression.
Wherein：Q is radiation energy, radiation energy abbreviation spoke energy, the amount that description emits, transmits or receives in the form of radiation.It is single
Position joule (J)；T is the unit time (S)；Φ e are radiation flux, unit (W).
Radiation intensity (Ie) is defined as the radiation flux that the unit solid angle inner light source in given transmission direction is sent out,
I.e.：
Wherein：Ie units are watt every surface of sphere, W/Sr；Ω is mikey solid angle, and unit is surface of sphere, Sr.
Radiance/spoke brightness (Le) is defined as light source on its vertical radiation transmission direction, and per surface area unit is vertical
The radiation flux sent out in body angle, i.e.,
Wherein：Le is emission measure (EM), and unit is：Watt per surface of sphere square metre, W/ (Srm2)；Φ e are radiation flux, single
Position (W)；Ie is radiation intensity, and unit is watt every surface of sphere (W/Sr)；Ω is mikey solid angle, and unit is surface of sphere
(Sr)；A is unit surface area, and unit is square metre (m2)；θ is the angle with light source vertical direction.
It can be obtained according to above-mentioned formula, the present invention improves the light utilization efficiency of laser tube by increasing operating current.
In order to fully demonstrate the effect that the present invention improves the utilization rate of light, the size of the operating current is rated current
2 times or more.Can be obtained by theoretical calculation, if the size of operating current be 2 times of rated current hereinafter, if brightness carry
Liter is extremely limited, but works as the excessive service life that will have a direct impact on laser tube of electric current, it is further preferred that the operating current
Size be 2~3 times of rated current.Through actual test, when the size of the operating current is more than 3 times or more of rated current
Afterwards, the service life of laser tube substantially reduces；
When operating current is 2~3 times of rated current, in 1/3 (there are three monochromatic laser light sources by setting)
In fluorescent lifetime, the luminous flux sent out also improves 2~3 times.Compared with prior art, it has got around and has been produced since sequential shines
Raw light utilization efficiency only has 33% situation, and compared to the laser tube for not doing current compensation, luminous power improves 1.4~3 times, greatly
The big light utilization efficiency for improving laser tube.
In order to which coloury image can be allotted, it is preferred that the centre wavelength of three primary light sources is respectively 605
~700nm, 500~560nm and 435~480nm.
Preferably, the time sequential pulse control circuit includes：
Control unit, corresponding each one group of adjustable voltage of monochromatic laser light source sequential export and the second pulse signal；
Multiple CMOS inverters, it is corresponding respectively to receive one group of adjustable voltage and the second pulse signal, the second pulse letter
Number it is input signal, the drain electrode of adjustable voltage input PMOS tube, the CMOS inverter control output voltage amplitude is adjustable
The first pulse signal.
Adjustable voltage data can be obtained by the serial communication between control unit and host computer, and control unit controls digital-to-analogue
Converter generates multiple adjustable voltages, and control unit generates multiple corresponding second pulse signals by output port simultaneously, the
Two pulse signals are used for controlling CMOS inverter, and adjustable voltage is connected to the drain electrode of phase inverter PMOS tube, you can realize with adjustable electric
Pressure is adjustable first pulse signal of voltage amplitude of high level.
Sequential relationship between adjustable first pulse signal of voltage amplitude can be by controlling multiple second pulse signals
Sequential realize that multiple second pulse signals can be realized by the programming Control timer of control unit.
Since under the current compensation of time sequential pulse control circuit, in the duration that shines, the electric current on laser tube is higher than volume
Constant current, if mistake occurs for the second pulse signal of the sequential working sent out at this time or the first pulse signal, it will cause to swash
Light pipe continue is run under overload state, thus can there is a situation where laser tubes to burn out, for ensure laser tube safety fortune
Row, protection circuit is specially devised for this problem, to prevent no matter any reason generation timing sequence disappears, can be cut off rapidly
Electric current on laser tube protects laser tube.
Preferably, further include the protection circuit for preventing the same first pulse signal retention time more than the predetermined time.It is same
When first pulse signal retention time was more than the predetermined time, the output of the first pulse signal of circuitry cuts is protected, to which cut-out swashs
Electric current on light pipe realizes the protection of laser tube.
In order to improve the stability and validity of protection circuit, specifically, it is preferred that the protection circuit includes to first
The integrating circuit that pulse signal is integrated, for by comparator of the integrating circuit output voltage signal compared with preset value and
First switching element by comparator control for the first output of pulse signal of on and off.
The first pulse signal of integrating circuit pair integrates, and obtains preset voltage in voltage signal and comparator and is compared
Compared with comparison result controls first switching element.Protection circuit with integrating circuit can consider laser tube in high current
Size of current when state and working time, effective protection laser tube.
In order to ensure that the driving circuit sequential of each monochromatic laser light source carries out, it is preferred that the integrating circuit is parallel with control
The first pulse signal is made whether by the second switch element of integrating circuit, the second switch element is by the second pulse signal control
System.
When the second pulse signal is high level, the first pulse signal of time sequential pulse control circuit output is 0, at this time the
The voltage signal of two switching elements conductives, integrating circuit output is 0, and comparator exports high level, and the conducting of first switch member is described
First pulse signal is 0；When the second pulse signal is low level, second switch element cut-off, when the electricity of integrating circuit output
When signal being pressed to be more than predeterminated voltage, the conducting of first switch member, the first pulse signal normal work, capacitance C constant-current charges, long-pending at this time
The voltage signal linear decline of parallel circuit output.When the first pulse signal is less than predeterminated voltage because of capacitor charging, comparator
Low level, the cut-off of first switch member are exported, the first pulse signal is truncated, and size 0 realizes defencive function.
By improving heat dissipation effect and setting protection circuit, on the basis of improving the utilization rate of light, by laser projection
The brightness of machine is increased to 30000 lumens or more, and even up to 100000 lumen light sources still can be with steady operation.
In order to make each monochromatic source work under operating temperature appropriate, it is preferred that each monochromatic laser light source includes being used for
Control the temperature control circuit of laser tube operating temperature.
Preferably, the temperature control circuit includes the sensor for detecting laser tube operating temperature, the inspection of receiving sensor
The comparator that result is compared with preset temperature is surveyed, mounted on the bottom of laser tube for adjusting the heat sink of temperature, Yi Jigen
The third switch element of the heat sink work of output control is judged according to comparator.Foregoing circuit has the advantages of simple structure and easy realization, and controls essence
Degree is high, it is further preferred that described heat sink using Peltier.
The operation principle of Peltier is the one side of patch after current turns ON, will produce refrigeration effect, and another face is exactly
Heat.The operating temperature on laser tube is accurately measured by temperature resistance, when temperature is more than setting value, at this point, Peltier is just
It can be cooled down in face of laser tube by the one of refrigeration, and the heat that another side generates, then it is dissipated, is thereby guaranteed that sharp by cooling system
Light pipe operating temperature is kept constant.
It is using another benefit of Peltier, it, can be with when being less than the operating temperature of laser when environment temperature is too low
Environment actual temperature is measured by temperature-control circuit, then gives Peltier with backward voltage, the one side freezed originally at this time is opened
Beginning becomes heating, and preheats, after reaching normal working temperature, then starts to work, after work, Peltier is extensive immediately to laser tube
Multiple normal power supply pattern.
Beneficial effects of the present invention：
Light source unit of the present invention using multiple monochromatic laser light source time cooperations as projection, is controlled by time sequential pulse
Circuit compensation is loaded into the electric current on each laser tube, and it is more than its rated current to make the electric current being loaded on laser tube, to effectively
The utilization rate for improving light, since cost accounting of the laser light source cost in projector is more than 50% or more, using such mode,
The production cost of projector can be substantially reduced, while the heat generated is also greatly decreased, therefore alleviate the pressure of cooling system
Power, and the cost of radiator portion namely corresponding reduction, while the reduction of heat also improves the service life of projecting apparatus；
Due to adopting this method, light utilization efficiency improves, and heat is also accordingly reduced caused by light loss, therefore so that throws
Shadow machine can develop to high brightness, be calculated by theoretical, the brightness of method using the present invention, laser projection can reach 100,000
It is more than lumen.
Description of the drawings
Fig. 1 is the structure line frame graph of the present invention.
Fig. 2 is the structure diagram of the time sequential pulse compensation system of the present invention.
Fig. 3 is the circuit diagram of the time sequential pulse control circuit of the present invention.
Fig. 4 is the circuit diagram of the protection circuit of the present invention.
Fig. 5 is the driving circuit block diagram of the driving circuit and blue laser of the red laser of the present invention.
Fig. 6 is the driving circuit block diagram of the green (light) laser of the present invention.
Fig. 7 is the dimensional structure diagram of the red laser and blue laser of the present invention.
Fig. 8 is the dimensional structure diagram of the green (light) laser of the present invention.
Fig. 9 is the circuit diagram of the constant current source control circuit of the present invention.
Figure 10 is the circuit diagram of the temperature control circuit of the present invention.
Specific implementation mode
As shown in Figure 1, the laser projection of the present embodiment includes light-source system and imaging system, as shown in Figure 1, light source system
System includes red laser diode (red monochromatic light source), green semiconductor laser (green monochromatic light source), blue partly leads
Body laser (blue monochromatic light source), corresponding laser driving circuit and to each laser driving circuit provide pulse signal
Time sequential pulse compensation system.
Time sequential pulse compensation system major function is：
1) time series pulse signals are provided, that is, controls luminous duration and sequence of light per color laser, 3 coloured light is made to open successively
It opens, each opening time control is accurate to microsecond.
2) while according to the luminous duration of every coloured light, power back-off scheme is calculated.The core of pulse sequence compensation is root
According to every color lasing fluorescence time, the electric current on laser tube is automatically controlled, is shone duration according to laser tube, is shone duration to laser tube
Interior electric current compensates, and makes it in 1/3 fluorescent lifetime, 3 times or so of the current compensation on laser tube to rated current
(each laser is different).Make it under time sequence status by the control of electric current, its luminous power is made to improve 3 times or so.
As shown in Fig. 2, time sequential pulse compensation system includes：
System controlling software, system controlling software are mounted on computer, and software is by connecing control signal input interface pair 3
The luminous duration of coloured light is set separately, while the sequential for controlling 3 coloured light puts in order, and is compensated according to luminous duration calculation
Scheme.
Time sequential pulse control circuit, the luminous duration provided according to system controlling software, and the benefit due to being calculated
Scheme is repaid, control laser drive circuit compensates luminous system, is to lean on modulated signal between each laser drive circuit
Line carries out data transmission.
Time sequential pulse control circuit in the present embodiment is as shown in figure 3, the major function of time sequential pulse control circuit is：1)
Realize the adjustable pulse signal of voltage amplitude of corresponding 3 lasers；2) meet certain sequential between this 3 pulse signals to close
System.
Adjustable voltage data (size and sequential relationship) can be by microcontroller (control unit) between host computer
Serial communication obtains, microcontroller control digital analog converter DAC generate corresponding 3 lasers adjustable voltage Var1, Var2 and
Var3；Microcontroller generates 3 corresponding pulse signal GATE1, GATE2 and GATE3 by input/output end port simultaneously, this
Three pulse signals are used for controlling CMOS inverter, and adjustable voltage is connected to the drain electrode of phase inverter PMOS tube, you can obtains with Var1
For the adjustable pulse signal Vout1 of voltage amplitude of high level.Corresponding receive GATE1 and Var1 one group is only depicted in figure
DAC and phase inverter, the adjustable pulse signal Vout2 of other two voltage amplitudes and Vout3 are omitted, the two signals equally can be with
It is realized with DAC plus phase inverter, Vout1, Vout2, Vout3 are corresponding respectively to control red, green, blue laser.
Sequential working between 3 adjustable pulse signals of voltage amplitude can be by controlling GATE1, GATE2 and GATE3
The sequential of three signals realizes that this can be realized by the programming Control timer of microcontroller (control unit).
Signal input interface is controlled, is the interface of control software and time sequential pulse control circuit, i.e., the data between computer
The interface of transmission.
Protect circuit, due under time sequential pulse compensating coefficient, in the duration that shines, the electric current on laser tube be specified
3 times or so of electric current, if mistake occurs for time series pulse signals at this time, it will laser tube is caused to continue to transport under overload state
Row, thus can there is a situation where laser tubes to burn out, for ensure laser tube safe operation, specially devise guarantor for this problem
Protection circuit can cut off rapidly the electric current on laser tube to prevent no matter any reason generation timing sequence disappears, and protect laser
Pipe.In the present embodiment, protection circuit is connected between time sequential pulse control circuit and the driving circuit of each laser.
Protection circuit figure is as shown in figure 4, what is indicated in figure is for the laser controlled by pulse signal Vout1
The protection circuit mode of protection, pulse signal Vout2 and pulse signal Vout3 are identical as pulse signal Vout1 as structure.
Operation principle：For GATE1 signals in low level, laser tube is operated in high current pattern, and size of current is by voltage
Vout1 determines that it is to obtain the retention time of voltage Vout1 by an integrating circuit to protect the basic ideas of circuit, when this
When retention time is more than setting guard time, protection circuit closes voltage Vout1, and laser tube is made to be forced into zero current shape
State.
As shown, amplifier constitutes reverse integral circuit, voltage Vout1 is integrated, voltage Vintegrate is obtained,
Then Vintegrate and preset protection voltage Vproctect (negative voltage) are compared, comparison result controls Q2
Switch.
When GATE1 is high level, Vout1 0, Q1 are connected, Vintegrate 0, and comparator exports high level, and Q2 is led
Logical, it is 0 that Vout_p, which is equal to Vout1,；When GATE1 is low level, Vout1 is variable voltage Var1, Q1 cut-off, Vintegrate
It is connected more than Vproctect, Q2, while capacitance C constant-current charges, Vintegrate linear declines, when Vintegrate is because of capacitance
When charging and being less than Vproctect, comparator exports low level, and Q2 cut-offs, Vout1_p 0, i.e., Vout1_p is by variable voltage
Var1 becomes 0, realizes defencive function.
When GATE1 is low level, the relationship of Vintegrate and time are：
When Vintegrate is equal to Vproctect, defencive function starts, and Vout1t is constant at this time, that is, protects circuit can be comprehensive
It closes and considers size of current and working time of the laser tube in current state, this is a feature of this protection circuit, can be with
Effective protection, it is possible to prevente effectively from the accidentally generation of chopping current.
In the present embodiment, identical such as Fig. 5, green light swash for the driving circuit of red laser and the driving circuit of blue laser
The driving circuit of light device such as Fig. 6.
The driving circuit of red laser includes power interface, input power interface, input voltage 6.5V；Temperature control circuit,
Control laser tube operating temperature, 25 DEG C of operating temperature；Constant current source control circuit provides stable electric current to laser tube, specified
Under current work state, for current control in 650mA, the present embodiment uses time sequential pulse pattern, operating current to control in 2A or more,
Specific electric current is automatically adjusted according to compensation circuit result of calculation；Current foldback circuit, when electric current is more than setting value and voltage is anti-
Xiang Shi automatically cuts off laser tube operating current；Laser interface tube is connect with red laser pipe signal wire；Constant flow regulation port, electricity
Stream setting adjusts port manually；Temperature control adjusts port, and temperature control adjusts port manually；
Major function is：It controls red laser pipe to shine, stable electric current (constant-current source control) is provided；Monitor laser tube sheet
Body temperature starts temperature control circuit (heat sink), cools down to laser tube, when temperature reaches 25 immediately when temperature is more than 25 DEG C
DEG C heat sink work stops, and when operating ambient temperature is less than 25 DEG C, temperature control circuit will give heat-sink system one backward voltage,
Heat-sink system is set to heat laser tube, to reach 25 DEG C of the operating temperature of design.
The driving circuit of green (light) laser includes power interface, input power interface, input voltage 6.5V；Temperature control electricity
Road 1 controls the temperature of green light resonant cavity；Temperature-control circuit 2 controls the operating temperature of laser tube, 25 DEG C of operating temperature；Constant current
Source control circuit provides stable electric current to laser tube, and under rated current working condition, current control is in 3.2A, this implementation
Example uses time sequential pulse pattern, operating current to control in 10A or more, and specific electric current is adjusted automatically according to compensation circuit result of calculation
Section；Current foldback circuit when electric current is more than setting value and when voltage reversal, automatically cuts off laser tube work；Laser tube connects
Mouthful, it is connect with red laser pipe signal wire；Constant flow regulation port, electric current setting adjust port manually；Temperature control adjusts port, temperature
Control adjusts port manually.
Major function is：It controls green laser pipe to shine, stable electric current (constant-current source control) is provided；Equipped with temperature control system
System monitors laser tube self-temperature at any time, when temperature is more than 25 DEG C, start-up temperature control system (heat sink) immediately, to laser
Pipe cools down, and stops when temperature reaches 25 DEG C of heat sink work；When operating ambient temperature is less than 25 DEG C, temperature system will be to warm
Sinking system gives a backward voltage, so that heat-sink system is heated laser tube, to reach 25 DEG C of the operating temperature of design.
The driving circuit of blue laser includes power interface, input power interface, input voltage 11V；Temperature control electricity
Road controls laser tube operating temperature, 25 DEG C of operating temperature；Constant current source control circuit provides stable electric current to laser tube, in volume
Under constant current working condition, for current control in 1.2A, the present embodiment uses time sequential pulse pattern, operating current control 3A with
On, specific electric current is automatically adjusted according to compensation circuit result of calculation；Current foldback circuit, when electric current is more than setting value, Yi Ji electricity
When pressing reversed, laser tube work is automatically cut off；Laser interface tube is connect with red laser pipe signal wire；Constant flow regulation port, electricity
Stream setting adjusts port manually；Temperature control adjusts port, and temperature control adjusts port manually.
Major function is：It controls blue laser pipe to shine, stable electric current (constant-current source control) is provided；Equipped with temperature control system
System monitors laser tube self-temperature at any time, when temperature is more than 25 DEG C, start-up temperature control system (heat sink) immediately, to laser
Pipe cools down, and stops when temperature reaches 25 DEG C of heat sink work；When operating ambient temperature is less than 25 DEG C, temperature system will be to warm
Sinking system gives a backward voltage, so that heat-sink system is heated laser tube, to reach 25 DEG C of the operating temperature of design.
As red light source red laser structure as shown in fig. 7, comprises：Red laser pipe 11, red laser pipe are adopted
Use the ML510P73 that Mitsubishi produces as illuminating source, power 500mW, wavelength 638nm；Red laser pipe is to driving circuit
Interface 12 is connect with feux rouges driving circuit, and using 6 core signal wires, 2 power cords (positive and negative), 2 temperature sampling resistance are (just,
It is negative), 2 heat sink supply lines's (positive and negative)；Heat sink 13, Temperature-controlled appliance makes the protection of laser tube operating temperature at 25 DEG C, temperature
It is heat sink to freeze to laser tube when degree is more than；Fibre-optical splice 14, the sent out laser of laser tube realize long distance after coupled into optical fibres
From transmission, red laser tube bottom plate 15, laser tube fixes bottom plate；Temperature sampling resistance 16, temperature sampling resistance are changed by temperature
When change, resistance also can accordingly change, and by the reading to resistance, realize temperature control, sampling resistor is in temperature
Resistance value 50K when being 24 DEG C.
Blue laser structure as blue-light source is identical as red laser structure, and blue laser pipe uses OSRAM
PL TB450B laser tubes, power 1.6W, wavelength 450nm.
Green (light) laser structure as green light source is as shown in figure 8, include temperature sampling resistance 21,808nm laser tubes
Temperature sampling resistance, temperature sampling resistance are when being changed by temperature, and resistance also can accordingly change, by hindering resistance
Temperature control, sampling resistor resistance value 50K when temperature is 24 DEG C are realized in the reading of value；Coupling focusing lens 22,808nm is swashed
The light that light pipe is sent out, focuses in resonant cavity, forms the green light of 532nm wavelength；Resonant cavity 23, resonant cavity by laser crystal,
Frequency-doubling crystal, 3 part of dichroscope are at function is that the light of 808nm wavelength is converted to the green light of 532nm wavelength；Heat sink 24,
The temperature control device of resonant cavity 23 makes the protection of 23 operating temperature of resonant cavity at 25 DEG C, heat sink to freeze to resonant cavity when temperature is more than；
Temperature sampling resistance 25, resonant cavity temperature sampling resistance, temperature sampling resistance is when being changed by temperature, and resistance also can
It is corresponding to change, by the reading to resistance, realize temperature control, sampling resistor resistance value 50K when temperature is 24 DEG C；
808nm laser tubes 26, green luminescence uses the laser tube of 808nm wavelength, after resonant cavity pump, forms 532nm wavelength
Green light, laser tube power 3W；Heat sink 27, laser tube temperature control device makes the protection of 26 operating temperature of 808nm laser tubes at 25 DEG C, temperature
It is heat sink to freeze to 808nm laser tubes 26 when degree is more than.
The constant current source control circuit of assorted laser is identical with temperature control circuit structure, constant current source control circuit as shown in figure 9,
Temperature control circuit is as shown in Figure 10.
The constant current function of constant current source control circuit is mainly realized that Q1 is operated in amplification region, Q1 base currents by NPN pipes Q1
It is determined by input voltage Vout1 (Vout2, Vout3), and keeps current amplification factor β between collector current and base current
Times relationship, collector current is exactly to flow through laser diode current, and laser diode current is true by input voltage Vout1 (Vout2, Vout3)
Fixed, when Vout1 (Vout2, Vout3) is remained unchanged, laser diode current remains unchanged, and realizes constant current function, works as Vout1
When (Vout2, Vout3) changes, laser diode current also changes therewith, to realize 3 times or so in the loading capacity of rated current, in fact
Existing current compensation.
Cooling in temperature control circuit is realized by Peltier, realizes that circuit is as shown in the figure.Thermistor Rt resistance values (temperature
Spend sampling resistor) it increases and declines with temperature, when dut temperature is more than set temperature, comparator exports high level, MOSFET
Conducting, Peltier work, plays refrigeration cool-down, and when dut temperature is less than set temperature, comparator exports low level,
MOSFET ends, and Peltier does not work.Set temperature can be changed by regulation resistance R4 and R5.
By the present embodiment, actually continuous 3 times of time sequential pulses compensation is tested for luminous 72 hours, 3 times of time sequential pulses compensation in 72 hours
In luminescence process, lasing fluorescence bad light.
In conclusion the present invention be directed to be exactly on single DLP projector, the prior art to the utilization rate of light source at most
Only 40% still using sacrifice color as cost.And the laser of the present invention is as light source, by time sequential pulse compensation technique,
Utilization rate of the light before entering imager chip is reached 100% by the utilization rate for solving the problems, such as the light in single DLP projection system；
On the basis of the utilization rate for improving light, the brightness of projector is increased to 30000 lumens or more, even up to 100000 lumens,
Still can be with steady operation, and luminescent lifetime was up to 20000 hours or more.
Claims (9)
1. a kind of laser projection carrying out time sequential pulse compensation to light source, including multiple monochromatic laser light sources, receive each monochrome
The imaging unit of laser light source emergent light, and provide the first pulse signal to the driving circuit sequential of each monochromatic laser light source
Time sequential pulse control circuit, the monochromatic laser light source include at least three different primary light sources, which is characterized in that described
The operating current that one pulse signal control laser drive circuit is loaded into corresponding one-wavelength laser pipe is more than the monochromatic laser light source
Rated current；The size of the operating current is the 2 times or more of rated current.
2. the laser projection of time sequential pulse compensation is carried out to light source as described in claim 1, which is characterized in that the work
The size of electric current is 2~3 times of rated current.
3. the laser projection of time sequential pulse compensation is carried out to light source as described in claim 1, which is characterized in that described three
The centre wavelength of primary light source is respectively 605~700nm, 500~560nm and 435~480nm.
4. the laser projection for carrying out time sequential pulse compensation to light source as described in claims 1 to 3 any claim, special
Sign is that the time sequential pulse control circuit includes：
Control unit, corresponding each one group of adjustable voltage of monochromatic laser light source sequential export and the second pulse signal；
Multiple CMOS inverters, one group of adjustable voltage of corresponding reception and the second pulse signal, second pulse signal are respectively
Input signal, the drain electrode of adjustable voltage input PMOS tube, the CMOS inverter control output voltage amplitude adjustable the
One pulse signal.
5. the laser projection of time sequential pulse compensation is carried out to light source as claimed in claim 4, which is characterized in that further include preventing
Only the same first pulse signal retention time is more than the protection circuit of predetermined time.
6. the laser projection of time sequential pulse compensation is carried out to light source as claimed in claim 5, which is characterized in that the protection
Circuit includes the integrating circuit integrated to the first pulse signal, is used for integrating circuit output voltage signal and preset value ratio
Compared with comparator and by comparator control for the first output of pulse signal of on and off first switching element.
7. the laser projection of time sequential pulse compensation is carried out to light source as claimed in claim 6, which is characterized in that the integral
Whether circuit in parallel has the first pulse signal of control by the second switch element of integrating circuit, and the second switch element is by the
Two pulse signals control.
8. the laser projection for carrying out time sequential pulse compensation to light source as described in claims 1 to 3 any claim, special
Sign is that each monochromatic laser light source includes the temperature control circuit for controlling laser tube operating temperature.
9. the laser projection of time sequential pulse compensation is carried out to light source as claimed in claim 8, which is characterized in that the temperature control
Circuit includes the sensor for detecting laser tube operating temperature, and the testing result of receiving sensor is compared with preset temperature
Comparator, mounted on the bottom of laser tube for adjusting the heat sink of temperature, and according to comparator judge that output control is heat sink
The third switch element of work.
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| CN111240144B (en) * | 2018-11-29 | 2022-08-05 | 青岛海信激光显示股份有限公司 | Method for realizing digital micro-reflector driving control in projection imaging |
| CN111381416B (en) * | 2018-12-29 | 2021-10-22 | 深圳光峰科技股份有限公司 | Display system |
| CN111670378A (en) * | 2019-01-09 | 2020-09-15 | 深圳市大疆创新科技有限公司 | Light emitting device, distance measuring device and mobile platform |
| CN112086855B (en) * | 2019-06-13 | 2022-11-01 | 海信视像科技股份有限公司 | Laser driving circuit, laser display device and laser driving method |
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| CN101897090A (en) * | 2007-12-21 | 2010-11-24 | 微视公司 | Method and apparatus for laser diode compensation |
| CN202487965U (en) * | 2012-02-01 | 2012-10-10 | 深圳市联赢激光股份有限公司 | Semiconductor laser unit temperature controlling circuit |
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| JP2011075919A (en) * | 2009-09-30 | 2011-04-14 | Casio Computer Co Ltd | Light source device, projection apparatus and projection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101897090A (en) * | 2007-12-21 | 2010-11-24 | 微视公司 | Method and apparatus for laser diode compensation |
| CN202487965U (en) * | 2012-02-01 | 2012-10-10 | 深圳市联赢激光股份有限公司 | Semiconductor laser unit temperature controlling circuit |
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