CN103442478A - Drive circuit and projector applying same - Google Patents
Drive circuit and projector applying same Download PDFInfo
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- CN103442478A CN103442478A CN201310302380XA CN201310302380A CN103442478A CN 103442478 A CN103442478 A CN 103442478A CN 201310302380X A CN201310302380X A CN 201310302380XA CN 201310302380 A CN201310302380 A CN 201310302380A CN 103442478 A CN103442478 A CN 103442478A
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Abstract
The invention provides a drive circuit used in a projector. The projector has a first working mode and a second working mode. The drive circuit comprises a signal control unit, an amplitude control unit and a pulse width control unit. The signal control unit controls the pulse width control unit and the amplitude control unit respectively according to pulse width control signals and amplitude control signals of different working modes of the projector, and regulates and controls wave shapes of drive currents provided for a light source. The light source generates light of the RGB three-color time sequence under driving of the drive currents, and therefore the drive current wave shapes corresponding to the different working modes are generated for the different working modes of the projector, and the display frame of the projector is optimized and regulated.
Description
Technical field
The present invention relates to field of projector, relate in particular to a kind of for thering is the drive circuit of different working modes projector.
Background technology
At present projector is applied to, in the occasion such as meeting bulletin, by projector, the interior perhaps chart of report be projected on display screen mostly, makes the participant can be by watching the data be incident upon on display screen to learn the content of report.But display frame color, picture quality and the brightness of projector are not easy to the user and adjust optimization.And, when the user is adjusted, the display frame of projector is difficult to be adjusted to customer satisfaction system effect.
Summary of the invention
The invention provides a kind of drive circuit, can be convenient to the user and regulate the picture quality of optimizing projector.
To achieve these goals, the invention provides a kind of drive circuit, this drive circuit is for projector, this projector can allow its mode of operation of user preset, and producing pulse-width control signal and amplitude control signal according to this mode of operation, this drive circuit provides drive current according to this pulse-width control signal and amplitude control signal, wherein, this drive current has the waveform corresponding with RGB tri-look sequential, and this drive circuit comprises signaling control unit, amplitude control unit and pulse width control unit.This signaling control unit is for receiving and processing this pulse-width control signal and amplitude control signal, and wherein, this pulse-width control signal is for controlling the pulsewidth of this waveform, and this amplitude control signal is for controlling the amplitude of this waveform; Amplitude control unit is electrically connected at this signaling control unit, and this amplitude control unit is for adjusting the amplitude of this waveform according to this amplitude control signal; Pulse width control unit is electrically connected at this signaling control unit, and this pulse width control unit is for adjusting the pulsewidth of this waveform according to this pulse-width control signal; Wherein, this projector has the first mode of operation and the second mode of operation, when this projector in the first mode of operation when producing the first pulse-width control signal and the first amplitude control signal, this signaling control unit is according to this first pulse-width control signal and the first amplitude control signal, control respectively this pulse width control unit and amplitude control unit, in order to generate the drive current of the first waveform; When this projector during in the second mode of operation when producing the second pulse-width control signal and the second amplitude control signal, this signaling control unit is according to this second pulse-width control signal and the second amplitude control signal, control respectively this pulse width control unit and amplitude control unit, in order to generate the drive current of the second waveform, wherein, the amplitude of this first waveform and this second waveform and/or pulsewidth is different and inequality proportion, and the drive current power of the second waveform is less than the drive current power of the first waveform.
Preferably, in described drive circuit, this drive circuit is connected in the light source of this projector, and this light source comprises LED light source or LASER Light Source, and this amplitude control unit is connected in the anode of this light source, and this pulse width control unit is connected in the negative electrode of this light source.
Preferably, in described drive circuit, this signaling control unit is the DC/DC controller, and this DC/DC controller has pulse width modulation end, control end, gate control end, current sense end and pulse width modulation output.
Preferably, in described drive circuit, the pulse width modulation termination of this DC/DC controller is received this pulse-width control signal, and the control end of this DC/DC controller receives this amplitude control signal.
Preferably, in described drive circuit, this amplitude control unit comprises a N channel field-effect pipe, DC power supply and inductance, the grid of the one N channel field-effect pipe is connected in the gate control end of this DC/DC controller, the source ground of the one N channel field-effect pipe, the drain electrode of the one N channel field-effect pipe is connected in an end of this inductance, and the other end of this inductance is connected in this DC power supply.
Preferably, in described drive circuit, this drive circuit also comprises current sensing unit, this current sensing unit is electrically connected at this amplitude control unit, this current sensing unit is connected in the current sense end of this DC/DC controller simultaneously, and this DC/DC controller is by this this drive current of current sensing unit sensing.
Preferably, in described drive circuit, this pulse width control unit comprises the 2nd N channel field-effect pipe, the grid of the 2nd N channel field-effect pipe is electrically connected at the pulse width modulation output of this DC/DC controller, the source ground of the 2nd N channel field-effect pipe, the drain electrode of the 2nd N channel field-effect pipe connects this light source.
Preferably, in described drive circuit, this pulse width control unit also has the wire jumper unit, and when this wire jumper unit is linked between the pulse width modulation output of this light source and this DC/DC controller, this pulse width control unit is not worked.
The present invention also provides a kind of projector, this projector can allow its mode of operation of user preset, and generate pulse-width control signal and amplitude control signal according to this mode of operation, this projector comprises drive circuit and light source, this drive circuit provides drive current according to this pulse-width control signal and amplitude control signal to this light source, this light source can generate the light of RGB tri-look sequential, wherein, this drive current has the waveform corresponding with RGB tri-look sequential, and this drive circuit is above-mentioned any one described drive circuit.
Compared with prior art, signaling control unit of the present invention is according to the pulse-width control signal under the different working modes of projector and amplitude control signal, control respectively pulse width control unit and amplitude control unit, the waveform of the drive current that offers light source is regulated and controled.This light source produces the light of RGB tri-look sequential under the driving of this drive current, thereby has realized generating corresponding with it drive current waveform for projector's different working modes, and then has realized the optimization adjusting to the display frame of projector.
The accompanying drawing explanation
The structured flowchart that Fig. 1 is a preferred embodiment of the present invention;
Fig. 2 is another preferred embodiment driving circuit structure schematic diagram of the present invention;
Fig. 3 is that another preferred embodiment amplitude control signal of the present invention (Current Pulse PWM) concerns schematic diagram with drive current waveform;
Fig. 4 is the comparison of wave shape schematic diagram under another preferred embodiment normal mode of the present invention and battery saving mode.
Embodiment
For making that purpose of the present invention, structure, feature and function thereof are had to further understanding, hereby coordinate embodiment to be described in detail as follows.
As shown in Figure 1, be a preferred embodiment of the present invention driving circuit structure block diagram.This drive circuit 100 is for projector, and this projector can allow its mode of operation of user preset, and this projector has different mode of operations, and the user can arrange this projector's mode of operation, such as normal mode or battery saving mode etc. according to its demand.This projector at least has the first mode of operation and the second mode of operation, and the user can be switched to the second mode of operation by the first mode of operation by this projector.This projector can, according to the mode of operation of user preset, generate pulse-width control signal 102 and amplitude control signal 103.For example, this projector also has master board, and this master board can produce pulse-width control signal 102 and amplitude control signal 103 according to this mode of operation.The pulse-width control signal 102 that this master board produces is corresponding with the mode of operation of this projector with amplitude control signal 103.This drive circuit 100 can receive pulse-width control signal 102 and amplitude control signal 103.This drive circuit 100 provides drive current according to this pulse-width control signal 102 and amplitude control signal 103.During in the first mode of operation, generate the first pulse-width control signal and the first amplitude control signal when this projector; This projector, when the second mode of operation, generates the second pulse-width control signal and the second amplitude control signal.The different mode of operation according to this, generate pulse-width control signal 102 and the amplitude control signal 103 corresponding with this mode of operation, and this pulse-width control signal 102 and amplitude control signal 103 be transferred to drive circuit 100, with the regulation and control drive current.This projector also has light source 101, this drive current provides drive current for this light source 101, this light source 101 can generate the light of RGB tri-look sequential, wherein, this drive current has the waveform corresponding with RGB tri-look sequential, thereby the different mode of operation of this projector is corresponding to the different wave of this drive current, the drive current by different wave regulates and controls the luminous of this light source 101.For example, this light source 101 comprises LED light source or LASER Light Source.This light source 101 also has colour wheel, this LED light source or LASER Light Source are by the colour wheel R/G/B block that shines this rotation, the light that there are RGB tri-look sequential with generation, because this drive current has the waveform corresponding with RGB tri-look sequential, by regulating and controlling the waveform of this drive current, be radiated at respectively the luminous intensity on this colour wheel R/G/B block to regulate and control this LED light source or LASER Light Source, thereby realized the regulation and control to the RGB tri-look sequential light of the generation of this light source 101, and then realized the adjusting optimization to projector's display frame.
This drive circuit 100 comprises signaling control unit 106, amplitude control unit 110, current sensing unit 111 and pulse width control unit 112.This signaling control unit 106 is the DC/DC controller, and this DC/DC controller has pulse width modulation end 104, control end 105, gate control end 107, current sense end 109 and pulse width modulation output 108.The pulse width modulation end 104 of this signaling control unit 106 and control end 105 are respectively used to receive this pulse-width control signal 102 and amplitude control signal 103; This gate control end 107 is electrically connected at this amplitude control unit 110, and this gate control end 107 is controlled this amplitude control unit 110 according to the amplitude control signal 103 received, to regulate the amplitude of drive current waveform; This current sense end 109 is electrically connected at current sensing unit 111, the current signal that this current sense end 109 detects for received current sensing cell 111; Pulse width modulation output 108 is electrically connected at this pulse width control unit 112, and this pulse width modulation output 108 is controlled this pulse width control unit 112 according to the pulse-width control signal 102 received, to regulate the pulsewidth (or duty ratio) of drive current waveform.This amplitude control unit 110 is electrically connected at the gate control end 107 of this signaling control unit 106, this amplitude control unit 110 is for regulating and controlling the amplitude of this waveform, this amplitude control unit 110 comprises DC source, energy-storage travelling wave tube and switch, this amplitude control unit 110 is controlled discharging and recharging of energy-storage travelling wave tube by switch, to regulate the size of current of this DC source output.Current sensing unit 111 is electrically connected at this amplitude control unit 110, and this current sensing unit 111 is for detecting this drive current, and the current signal that this current sensing unit 111 detects it feeds back to the current sense end 109 of signaling control unit 106.Pulse width control unit 112 is electrically connected at the pulse width modulation output 108 of this signaling control unit 106, and this pulse width control unit 112 is for regulating and controlling the pulsewidth of this waveform; For example, this projector has light source, and this light source 101 comprises LED light source or LASER Light Source, and this amplitude control unit 110 is connected in the anode of this light source 101 by current sensing unit 111, and this pulse width control unit 112 is connected in the negative electrode of this light source 101.After the mode of operation of this projector is arranged by the user, generate pulse-width control signal 102 and amplitude control signal 103, the pulse width modulation end 104 of signaling control unit 106 and control end 105 are accepted respectively this pulse-width control signal 102 and amplitude control signal 103, this signaling control unit 106 is regulated and controled by 107 pairs of these amplitude control units 110 of gate control end according to this amplitude control signal 103, and this signaling control unit 106 is regulated and controled by 108 pairs of these pulse width control unit 112 of pulse width modulation output according to this pulse-width control signal 102 simultaneously.Thereby realized the regulation and control to drive current amplitude and pulsewidth, realized the mode of operation different for this projector, generated the waveform of the drive current corresponding with this mode of operation.The light source 1014 of this projector is under the drive current of this waveform drives, produce the light of the RGB tri-look sequential corresponding with this mode of operation, by adjusting the waveform of drive current, realized the adjustment to the RGB of projector tri-look sequential light, and then realized the optimization of projector's display frame is regulated.In addition, this pulse width control unit 112 of this embodiment also comprises wire jumper unit 113, when not needing to carry out pulse-width regulated, in these wire jumper unit 113 places in circuit so that this pulse width control unit 112 do not work.
For clearer description the present invention, in conjunction with the physical circuit connection diagram of another embodiment of the present invention, further explain.As shown in Figure 2, be another embodiment of the present invention drive circuit schematic diagram, this drive circuit 200 provides drive current for laser (Laser) light source module.This drive circuit 200 comprises signaling control unit 201, amplitude control unit 202, current sensing unit 203 and pulse width control unit 204.This signaling control unit 201 is the DC/DC controller, and the present embodiment be take the LT3756 controller of Linear Techn Inc. (Linear) and explained as example.This DC/DC controller has 16 pins and an earth terminal G1.These 16 pins sequentially are respectively PWM_OUT end, FB end, ISN end, ISP end, Vc end, CTRL end, VREF end, PWM end, OPENLED end, SS end, RT end, SD/UV end, INTVcc end, Vin end, SENSE end and GATE end.Wherein, pin one is the PWM_OUT end, and corresponding to the pulse width modulation output 108 in Fig. 1, this pin one is suitable for the pulse width modulating signal of laser light source module for output, and this pin one is connected in this pulse width control unit 204.Pin two is the FB end, and whether this pin two is connected to this drive circuit 200 for detecting laser light source module.Pin 3 and pin 4 are respectively ISN end and ISP end, and corresponding to the current sense end 109 in Fig. 1, pin 3 and pin 4 are for detecting the drive current of laser light source module, and this pin 3 and pin 4 are connected in this current sensing unit 203.Pin 5 is the Vc end, and this pin 5 is connected to R9 and C2 forms the RC loop, and this pin 5 is for stablizing the voltage circuit of this DC/DC controller.Pin 6 is the CTRL end, and this pin 6 is corresponding to the control end 105 in Fig. 1, and this pin 6 is by resistance R 18 received current pulse pulse width modulation signals (Current Pulse PWM), i.e. amplitude control signal in corresponding diagram 1.This pin 6 is by capacitor C 3 ground connection simultaneously.Pin 7 is the VREF end, and pin 7 can provide reference voltage, and this pin 7 is connected to current impulse pulse-width signal (Current Pulse PWM) by resistance R 17 and R18, and this pin 7 is by resistance R 17 and resistance R 16 ground connection simultaneously.Because current impulse pulse-width signal (Current Pulse PWM) is not suitable for this DC/DC controller, thereby need by pin 6 and pin 7 combinations, and by capacitor C 3, R16, R17 and R18, current impulse pulse-width signal (Current Pulse PWM) is carried out to integral processing, thereby to be applicable to this DC/DC controller.Pin 8 is the PWM end, and this pin 8 is corresponding to the pulse width modulation end 104 in Fig. 1, and this pin 8 is for receiving pulse-width control signal (PWM_OUT).Pin G1 is earth terminal (GND).Pin 9 is the OPENLED end, this pin 9 is connected to signal INTvcc_1 by resistance R 10, this INTvcc_1 is transmitted by resistance R 15 and R14 by pulse width signal PWM_OUT, and this pin 9 is exported signal Open_1 simultaneously, and this pin 9 is reported for the laser light source module open fault.This pin one 0 is the SS end, and this pin one 0 is by capacitor C 1 ground connection, and this pin one 0 is for the soft start of this DC/DC controller.Pin one 1 is the RT end, and this pin one 1 is by resistance R 11 ground connection, and this pin one 1 is regulated for the switching frequency of this DC/DC controller.Pin one 2 is the SD/UV end, and this pin one 2 is connected to input voltage Vcc1 by resistance R 13, and by resistance R 12 ground connection, this pin one 2 is closed or under-voltage sensing for this DC/DC controller simultaneously.Pin one 3 is the INTVcc end, and this pin one 3 connects INTvcc_1, and simultaneously by capacitor C 4 ground connection, this pin one 3 is used to DC/DC controller internal load, grid to drive and the PWM driving provides stabilized voltage power supply.Pin one 4 is the Vin end, and this pin one 4 is connected to input voltage Vcc1, and this pin one 4 is for providing input power to this DC/DC controller.Pin one 5 is the SENSE end, this pin one 5 is connected to this amplitude control unit 202, and this pin is for detecting the control electric current of amplitude control unit 202, and pin one 6 is the GATE end, this pin one 6 is connected in this amplitude control unit 202, corresponding to the gate control end 107 in Fig. 1.
In brief, the pin two of this DC/DC controller, pin 5, pin 7, pin 9, pin one 0, pin one 1, pin one 2, pin one 3, pin one 4 and pin one 5 are mainly used in maintaining the normal operation of this DC/DC controller and the protection of chance failure.This DC/DC controller receives amplitude control signals (Current Pulse PWM) by pin 6, and according to this amplitude control signal (Current Pulse PWM), by pin one 6 with regulation and control amplitude control unit 202.This DC/DC controller receives pulse-width control signals (PWM_OUT) by pin 8 simultaneously, and according to this pulse-width control signal (PWM_OUT), by pin one with regulation and control pulse width control unit 204.This DC/DC controller is connected to current sensing unit 203 by pin 3 and pin 4, exports to the drive current size of laser light source module with detecting.The pulse-width control signal (PWM_OUT) that this DC/DC controller receives according to it and amplitude control signal (Current Pulse PWM), realize respectively the regulation and control to amplitude control unit 202 and pulse width control unit 204, and then realized the regulation and control of the drive current to exporting to laser light source module.Wherein, amplitude control unit 202 is for regulating and controlling the time dependent amplitude size of this drive current, and pulse width control unit 204 is for regulating and controlling the time dependent pulsewidth of this drive current (or duty ratio).By the regulation and control of amplitude control unit 202 and pulse width control unit 204, can realize the regulation and control to the waveform of this drive current.This laser light source module, under the driving of this drive current, can generate the light of redgreenblue sequential, thinks that this projector provides the redgreenblue light source.Thereby the light of this redgreenblue sequential is corresponding with the waveform of this drive current, redgreenblue is respectively to the waveform in difference interval that should drive current.Because the waveform of this drive current produces according to pulse-width control signal (PWM_OUT) and amplitude control signal (Current Pulse PWM) regulation and control, pulse-width control signal (PWM_OUT) and amplitude control signal (Current Pulse PWM) are to generate according to the mode of operation of this projector simultaneously, therefore the specific operation mode of this projector is to specific waveforms that should drive current, this laser light source module generates the light of the redgreenblue sequential corresponding with this specific waveforms.The light of this redgreenblue sequential is corresponding with the mode of operation of this projector.When the user is switched the mode of operation of this projector, can realize the adjustment to this projector's redgreenblue light, and then realize the adjustment to this projector's display frame color.
This amplitude control unit 202 comprises a N channel field-effect pipe Q1, DC power supply 26V_DC and inductance L 1, the grid of the one N channel field-effect pipe Q1 is connected to the pin one 6 of this DC/DC controller by resistance R 3, thereby this DC/DC controller can be controlled conducting and the cut-off of a N channel field-effect pipe Q1.The source electrode of the one N channel field-effect pipe Q1 is connected to the pin one 5 of this DC/DC controller; the source electrode of the one N channel field-effect pipe Q1 is by resistance R 15 ground connection; the source electrode of a N channel field-effect pipe Q1 is connected to its grid by resistance R 4 simultaneously; thereby this DC/DC controller can be detected the electric current of the source electrode of this N channel field-effect pipe Q1, to protect this N channel field-effect pipe Q1.The drain electrode of the one N channel field-effect pipe Q1 is connected in an end of this inductance L 1, and the other end of this inductance L 1 is connected in this DC power supply 26V_DC.In addition, between the source-drain electrode of a N channel field-effect pipe Q1, be parallel with diode D1, the voltage of the Shi Burang drain electrode that this diode D1 can prevent in application becomes very negative and damages a N channel field-effect pipe Q1.This diode D1 is for the protection of a N channel field-effect pipe Q1.These inductance L 1 one ends are by voltage-stabiliser tube D3 output driving current, and this voltage-stabiliser tube D3 prevents the backflow of drive current.This DC/DC controller 201, by the conducting of control the one N channel field-effect pipe Q1 and the time of cut-off, is stored in the energy of inductance L 1 with control.When the ON time of a N channel field-effect pipe Q1 is longer, the electric energy be stored in electric pole L1 is also just larger, and the drive current of exporting to so laser light source module is also just larger, and now the amplitude of this drive current is larger.Because this DC/DC controller regulates and controls this amplitude control unit 202 according to amplitude control signal (Current Pulse PWM), the amplitude of this drive current regulates and controls according to amplitude control signal (Current Pulse PWM).In time and cyclic variation, the amplitude of this drive current is according to this amplitude control signal and time to time change to the pulse duration of this amplitude control signal (Current Pulse PWM) so.This laser light source module produces the light of redgreenblue sequential under the driving of this drive current, and so red sequential, green sequential and blue sequential are respectively to various amplitude that should drive current.Principle of adjustment and control for clearer description redgreenblue.As shown in Figure 3, receive the waveform of amplitude control signal (Current Pulse PWM) and the waveform of the drive current corresponding with it for this drive circuit.For example, when the ripple of amplitude control signal (Current Pulse PWM) wide when narrow, the drive current of now exporting to laser light source module is just less, and corresponding red R sequential now, when the ripple of amplitude control signal (Current Pulse PWM) is wide, the drive current of now exporting to laser light source module is just larger, and corresponding red green G sequential now, when the ripple of amplitude control signal (Current Pulse PWM) is wide, be normal, the drive current of now exporting to laser light source module is just normal, and corresponding blue B sequential now.The light of the redgreenblue sequential that i.e. this laser light source module output is corresponding with this drive current waveform, redgreenblue is respectively to the various amplitude in should drive current waveform.When the user adjusts this projector mode of operation, the corresponding change of this amplitude control unit (Current Pulse PWM), the waveform of this drive current is corresponding change also, the also corresponding change of light of the redgreenblue sequential that this laser light source module produces, and then realize this projector's display frame color is adjusted.
This drive circuit 200 also comprises current sensing unit 203, this current sensing unit 203 comprises resistance R 1, these resistance R 1 one ends are connected in the negative electrode of voltage-stabiliser tube D3 in amplitude control unit and the pin 3 of this DC/DC controller, thereby this pin 3 can detect signal of telecommunication ISP_1, this resistance R 1 other end is connected in the anode Laser_1+ of this laser light source module and the pin 4 of this DC/DC controller, thereby this pin 4 can detect signal of telecommunication ISN_1.This DC/DC controller is by the drive current of flowing through on pin 3 and pin 4 these current sensing unit 203 of detecting, thereby this DC/DC controller can detect the size of this drive current in real time, avoids extremely damaging circuit when drive current.
This pulse width control unit 204 comprises the 2nd N channel field-effect pipe Q2, the grid of the 2nd N channel field-effect pipe Q2 is electrically connected at the pin one of this DC/DC controller by resistance R 7, the source ground of the 2nd N channel field-effect pipe Q2, the drain electrode of the 2nd N channel field-effect pipe Q2 connects the negative electrode of this laser light source module.Between the source-drain electrode of the 2nd N channel field-effect pipe Q2, by diode D2, connect, the voltage of the Shi Burang drain electrode that this diode D2 can prevent in application becomes very negative and damages the 2nd N channel field-effect pipe Q2.This diode D2 is for the protection of the 2nd N channel field-effect pipe Q2.The pin 8 of this DC/DC controller receives pulse-width control signal (PWM_OUT), and controls this pulse width control unit 204 according to this pulse-width control signal (PWM_OUT) by pin one.This pulse width control unit 204 is by the 2nd Q2 conducting of N channel field-effect pipe and cut-off, thereby realizes the regulation and control to the pulsewidth (or duty ratio) of the drive current of the laser light source module of flowing through, i.e. the waveform width of these pulse width control unit 204 these drive currents of regulation and control.When the user is switched the mode of operation of this projector, the corresponding change of pulse-width control signal (PWM_OUT) of this master board output, the pulsewidth of this drive current (or duty ratio) is also with regard to corresponding change so.This pulse width control unit 204 also has wire jumper unit JW_1, and this wire jumper unit JW_1 mono-end is connected to the grid of the 2nd N channel field-effect pipe Q2 by resistance R 8, and this wire jumper unit JW_1 other end is connected to the negative electrode Laser_1-of this laser light source module.When this wire jumper unit JW_1 connects, this laser light source module directly is connected with the pin one of this DC/DC controller, and the 2nd N channel field-effect pipe Q2 is by short circuit so.When the pulsewidth of drive current not being adjusted, can connect wire jumper unit JW_1, so that the 2nd N channel field-effect pipe Q2 does not work.
For this drive circuit of clearer description, the operation principle of this drive circuit is as follows:
This projector has the first mode of operation and the second mode of operation, this projector is when the first mode of operation, produce the first pulse-width control signal and the first amplitude control signal, this signaling control unit is according to this first pulse-width control signal and the first amplitude control signal, control respectively this pulse width control unit and amplitude control unit, generate the first waveform of drive current; This projector is when the second mode of operation, produce the second pulse-width control signal and the second amplitude control signal, this signaling control unit is according to this second pulse-width control signal and the second amplitude control signal, control respectively this pulse width control unit and amplitude control unit, generate the second waveform of drive current.Wherein, this first waveform is corresponding with this projector's first mode of operation, and this second waveform is corresponding with this projector's second mode of operation, and this first waveform is different from this second waveform.Wherein, the amplitude of this first waveform and this second waveform and/or pulsewidth is different and inequality proportion, and the drive current power of the second waveform is less than the drive current power of the first waveform.As the user during in switching the first mode of operation and the second mode of operation, the user wishes to reduce projector's power consumption, and while changing the display frame color quality of this projector, for example this first mode of operation and the second mode of operation are normal mode and battery saving mode, in conjunction with the drive current waveform under two kinds of mode of operations shown in Fig. 4, the first mode of operation is normal mode, this first mode of operation is to the first waveform that should drive current, under this first waveform, the amplitude of red (R) corresponding drive current is 0.4A, the amplitude of green (G) corresponding drive current is 1.2A, the amplitude of blue (B) corresponding drive current is 0.8A.The second mode of operation is battery saving mode, this second mode of operation is to the second waveform that should drive current, under this second waveform, the amplitude of red (R) corresponding drive current is 0.5A, the amplitude of green (G) corresponding drive current is 0.2A, and the amplitude of blue (B) corresponding drive current is 0.8A.Now, under different working modes, redgreenblue is respectively to various amplitude size that should drive current, thus the light intensity difference of redgreenblue, and this projector's picture disply color also is not quite similar so.This drive circuit regulates and controls respectively amplitude and the pulsewidth of drive current corresponding to red sequential, green sequential and blue sequential by amplitude control unit and pulse width control unit, thereby this first waveform is different from the amplitude of this second waveform and inequality proportion, and the drive current power of the second waveform is less than the drive current power of the first waveform.As shown in following table 1 and table 2,
| The color sequential | Voltage/V | Electric current (amplitude) size/A | Pulsewidth (duty ratio) | Power/W |
| Red sequential | 2.65 | 0.4 | 2/9 | 0.2 |
| Green sequential | 4.88 | 1.2 | 4/9 | 2.6 |
| Blue sequential | 4.59 | 0.8 | 3/9 | 1.2 |
Table 1
| The color sequential | Voltage/V | Electric current (amplitude) size/A | Pulsewidth (duty ratio) | Power/W |
| Red sequential | 2.65 | 0.5 | 2/9 | 0.3 |
| Green sequential | 4.88 | 0.2 | 4/9 | 0.4 |
| Blue sequential | 4.59 | 0.8 | 3/9 | 1.2 |
Table 2
Table 1 is that the first mode of operation is normal mode, and wherein, the redgreenblue sequential amplitude size of corresponding drive current respectively is 0.4A, 1.2A, 0.8A, and this drive current power is 4W (=0.2W+2.6W+1.2W); Table 2 is that the second mode of operation is battery saving mode, and the redgreenblue sequential amplitude size of corresponding drive current respectively is 0.5A, 0.2A, 0.8A, and this drive current power is 1.9W (=0.3W+0.4W+1.2W).The drive current power of the second waveform is less than the drive current power of the first waveform.By adjusting this first waveform and inequality proportion different from the amplitude of this second waveform, and the drive current power of the second waveform is less than the drive current power of the first waveform, to adjust the light of redgreenblue sequential, and then realized the switching to this projector's normal mode and battery saving mode, adjusted the display frame color quality of this projector simultaneously.In prior art, normal mode is adjusted to battery saving mode, adjust to reduce the situation of drive current power with the equal proportion waveform, the present invention adjusts to reduce drive current power by the inequality proportion waveform, and adjust color (for example RGB tri-looks) allocation proportion simultaneously, thereby can make picture quality maintain the state that perfect condition or user want, and can not produce because of reducing drive current power the negative situation such as cross-color.
It should be noted that, in embodiment as shown in Figure 4, only adjusted this first waveform amplitude size corresponding with the light of redgreenblue sequential in this second waveform, to adjust the light of redgreenblue sequential.And in another embodiment of the present invention, also can be by the pulsewidth of adjusting this first waveform and this second waveform different and inequality proportion, and the drive current power of the second waveform is less than the drive current power of the first waveform, to adjust the light of redgreenblue sequential, and then realized the adjustment to this projector's display frame color quality.Adjust pulsewidth (duty ratio) difference in the corresponding waveform of light of redgreenblue sequential.In addition, also can adjust the amplitude of this first waveform and this second waveform and pulsewidth is different and inequality proportion simultaneously, and the drive current power of the second waveform is less than the drive current power of the first waveform, to adjust the light of redgreenblue sequential, and then realized the adjustment to this projector's display frame color quality.In brief, can adjust separately the first waveform and inequality proportion different from the amplitude of the second waveform; Also can adjust separately the different and inequality proportion of the pulsewidth of the first waveform and the second waveform; Also can adjust the amplitude of the first waveform and the second waveform and pulsewidth is different and inequality proportion simultaneously.
The present invention also provides a kind of projector, this projector can allow its mode of operation of user preset, and generate pulse-width control signal and amplitude control signal according to this mode of operation, this projector comprises drive circuit and light source, this drive circuit provides drive current according to this pulse-width control signal and amplitude control signal to this light source, this light source can generate the RGB(RGB) light of three look sequential, wherein, this drive current has the waveform corresponding with RGB tri-look sequential.This drive circuit comprises signaling control unit, amplitude control unit, current sensing unit and pulse width control unit.This signaling control unit is for receiving and process this pulse-width control signal and amplitude control signal; Amplitude control unit is electrically connected at this signaling control unit, and this amplitude control unit is for regulating and controlling the amplitude of this waveform; Current sensing unit is electrically connected at this amplitude control unit, and this current sensing unit is for detecting this drive current; Pulse width control unit is electrically connected at this signaling control unit, and this pulse width control unit is for regulating and controlling the pulsewidth of this waveform; Wherein, this projector has the first mode of operation and the second mode of operation, this projector is when the first mode of operation, produce the first pulse-width control signal and the first amplitude control signal, this signaling control unit is according to this first pulse-width control signal and the first amplitude control signal, control respectively this pulse width control unit and amplitude control unit, generate the first waveform of drive current; This projector is when the second mode of operation, produce the second pulse-width control signal and the second amplitude control signal, this signaling control unit is according to this second pulse-width control signal and the second amplitude control signal, control respectively this pulse width control unit and amplitude control unit, generate the second waveform of drive current, wherein, this first waveform is corresponding with this projector's first mode of operation, this second waveform is corresponding with this projector's second mode of operation, and this first waveform is different from this second waveform.Wherein, the amplitude of this first waveform and this second waveform and/or pulsewidth is different and inequality proportion, and the drive current power of the second waveform is less than the drive current power of the first waveform.Compared with prior art, signaling control unit of the present invention is according to the pulse-width control signal under the different working modes of projector and amplitude control signal, control respectively pulse width control unit and amplitude control unit, the waveform of the drive current that offers light source is regulated and controled.This light source produces the light of RGB tri-look sequential under the driving of this drive current, thereby has realized generating corresponding with it drive current waveform for projector's different working modes, and then has realized the optimization adjusting to the display frame of projector.
The present invention is described by above-mentioned related embodiment, yet above-described embodiment is only for implementing example of the present invention.Must be pointed out that, the embodiment disclosed does not limit the scope of the invention.On the contrary, the change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.
Claims (9)
1. a drive circuit, this drive circuit is for projector, this projector can allow its mode of operation of user preset, and produce pulse-width control signal and amplitude control signal according to this mode of operation, this drive circuit provides drive current according to this pulse-width control signal and amplitude control signal, and wherein, this drive current has the waveform corresponding with RGB tri-look sequential, it is characterized in that, this drive circuit comprises:
Signaling control unit, for receiving and processing this pulse-width control signal and amplitude control signal, wherein, this pulse-width control signal is for controlling the pulsewidth of this waveform, and this amplitude control signal is for controlling the amplitude of this waveform;
Amplitude control unit, be electrically connected at this signaling control unit, and this amplitude control unit is for adjusting the amplitude of this waveform according to this amplitude control signal;
Pulse width control unit, be electrically connected at this signaling control unit, and this pulse width control unit is for adjusting the pulsewidth of this waveform according to this pulse-width control signal;
Wherein, this projector has the first mode of operation and the second mode of operation, when this projector in the first mode of operation when producing the first pulse-width control signal and the first amplitude control signal, this signaling control unit is according to this first pulse-width control signal and the first amplitude control signal, control respectively this pulse width control unit and amplitude control unit, in order to generate the drive current of the first waveform; When this projector in the second mode of operation when producing the second pulse-width control signal and the second amplitude control signal, this signaling control unit is according to this second pulse-width control signal and the second amplitude control signal, control respectively this pulse width control unit and amplitude control unit, in order to generate the drive current of the second waveform, wherein, the amplitude of this first waveform and this second waveform and/or pulsewidth is different and inequality proportion, and the drive current power of the second waveform is less than the drive current power of the first waveform.
2. drive circuit as claimed in claim 1, it is characterized in that, this drive circuit is connected in the light source of this projector, and this light source comprises LED light source or LASER Light Source, this amplitude control unit is connected in the anode of this light source, and this pulse width control unit is connected in the negative electrode of this light source.
3. drive circuit as claimed in claim 1, is characterized in that, this signaling control unit is the DC/DC controller, and this DC/DC controller has pulse width modulation end, control end, gate control end, current sense end and pulse width modulation output.
4. drive circuit as claimed in claim 3, is characterized in that, the pulse width modulation termination of this DC/DC controller is received this pulse-width control signal, and the control end of this DC/DC controller receives this amplitude control signal.
5. drive circuit as claimed in claim 3, it is characterized in that, this amplitude control unit comprises a N channel field-effect pipe, DC power supply and inductance, the grid of the one N channel field-effect pipe is connected in the gate control end of this DC/DC controller, the source ground of the one N channel field-effect pipe, the drain electrode of the one N channel field-effect pipe is connected in an end of this inductance, and the other end of this inductance is connected in this DC power supply.
6. drive circuit as claimed in claim 3, it is characterized in that, this drive circuit also comprises current sensing unit, this current sensing unit is electrically connected at this amplitude control unit, this current sensing unit is connected in the current sense end of this DC/DC controller simultaneously, and this DC/DC controller is by this this drive current of current sensing unit sensing.
7. drive circuit as claimed in claim 3, it is characterized in that, this pulse width control unit comprises the 2nd N channel field-effect pipe, the grid of the 2nd N channel field-effect pipe is electrically connected at the pulse width modulation output of this DC/DC controller, the source ground of the 2nd N channel field-effect pipe, the drain electrode of the 2nd N channel field-effect pipe connects this light source.
8. drive circuit as claimed in claim 7, is characterized in that, this pulse width control unit also has the wire jumper unit, and when this wire jumper unit is linked between the pulse width modulation output of this light source and this DC/DC controller, this pulse width control unit is not worked.
9. a projector, this projector can allow its mode of operation of user preset, and generate pulse-width control signal and amplitude control signal according to this mode of operation, this projector comprises drive circuit and light source, this drive circuit provides drive current according to this pulse-width control signal and amplitude control signal to this light source, this light source can generate the light of RGB tri-look sequential, wherein, this drive current has the waveform corresponding with RGB tri-look sequential, it is characterized in that, this drive circuit is the claims 1 to 8 any one described drive circuits.
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| CN201310302380.XA CN103442478B (en) | 2013-07-16 | 2013-07-16 | Drive circuit and projector applying same |
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| WO2018018975A1 (en) * | 2016-07-29 | 2018-02-01 | 深圳市光峰光电技术有限公司 | Projecting apparatus, light source system, and current control method thereof |
| CN111223427A (en) * | 2018-11-23 | 2020-06-02 | 中强光电股份有限公司 | Projection device and operation method thereof |
| CN111556633A (en) * | 2020-05-26 | 2020-08-18 | 广州彩熠灯光股份有限公司 | Control circuit and lighting control system |
| WO2021121345A1 (en) * | 2019-12-19 | 2021-06-24 | 青岛海信激光显示股份有限公司 | Laser projection device and start method and shutdown method thereof |
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| CN103442478B (en) | 2015-04-29 |
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