CN103442478B - Drive circuit and projector applying same - Google Patents
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- CN103442478B CN103442478B CN201310302380.XA CN201310302380A CN103442478B CN 103442478 B CN103442478 B CN 103442478B CN 201310302380 A CN201310302380 A CN 201310302380A CN 103442478 B CN103442478 B CN 103442478B
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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, particularly relating to a kind of driving circuit for having different working modes projector.
Background technology
Current projector is applied in the occasions such as meeting bulletin mostly, by projector by report perhaps chart project on display screen, make participant can by watching the data that be incident upon on display screen to learn the content of report.But the display frame color of projector, picture quality and brightness are not easy to user carries out adjusting and optimizing.And when user adjusts, 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 driving circuit, user can be convenient to and regulate the picture quality optimizing projector.
To achieve these goals, the invention provides a kind of driving circuit, this driving circuit is used 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 driving 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 driving circuit comprises signaling control unit, amplitude control unit and pulse width control unit.This signaling control unit is used 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 used for the amplitude adjusting 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 used for the pulsewidth adjusting 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 is in the first mode of operation to 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 this pulse width control unit and amplitude control unit respectively, in order to generate the drive current of the first waveform; Time when this projector is in the second mode of operation to 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 this pulse width control unit and amplitude control unit respectively, in order to generate the drive current of the second waveform, wherein, the amplitude of this first waveform and this second waveform and/or the different and inequality proportion of pulsewidth, and the drive current power of the second waveform is less than the drive current power of the first waveform.
Preferably, in described driving circuit, this driving circuit is connected to 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 to the anode of this light source, and this pulse width control unit is connected to the negative electrode of this light source.
Preferably, in described driving circuit, this signaling control unit is DC/DC controller, and this DC/DC controller has pulse-length modulation end, control end, gate control end, current sense end and pulse-length modulation output terminal.
Preferably, in described driving circuit, the pulse-length modulation termination of this DC/DC controller receives this pulse-width control signal, and the control end of this DC/DC controller receives this amplitude control signal.
Preferably, in described driving circuit, this amplitude control unit comprises a N channel field-effect pipe, direct supply and inductance, the grid of the one N channel field-effect pipe is connected to 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 to one end of this inductance, and the other end of this inductance is connected to this direct supply.
Preferably, in described driving circuit, this driving circuit also comprises current sensing unit, this current sensing unit is electrically connected at this amplitude control unit, this current sensing unit is connected to the current sense end of this DC/DC controller simultaneously, and this DC/DC controller senses this drive current by this current sensing unit.
Preferably, in described driving 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-length modulation output terminal 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 driving circuit, this pulse width control unit also has wire jumper unit, and time between the pulse-length modulation output terminal that this wire jumper unit is linked into this light source and this DC/DC controller, this pulse width control unit does not work.
Present invention also offers 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 driving circuit and light source, this driving 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 driving circuit is the driving circuit described in above-mentioned any.
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 pulse width control unit and amplitude control unit respectively, the waveform of the drive current being supplied to light source is regulated and controled.This light source produces the light of RGB tri-look sequential under the driving of this drive current, thus achieves the drive current waveform generating correspondence with it for projector's different working modes, and then achieves the optimizing regulation of the display frame to projector.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of 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 another preferred embodiment amplitude control signal of the present invention (Current Pulse PWM) and drive current waveform relation schematic diagram;
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 there is further understanding to object of the present invention, structure, feature and function thereof, embodiment is hereby coordinated 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 driving circuit 100 is for projector, and this projector can allow its mode of operation of user preset, and namely this projector has different mode of operations, and user can arrange this projector's mode of operation, such as normal mode or battery saving mode etc. according to its demand.Namely this projector at least has the first mode of operation and the second mode of operation, and this projector can be switched to the second mode of operation by the first mode of operation by user.This projector according to the mode of operation of user preset, can generate pulse-width control signal 102 and amplitude control signal 103.Such as, this projector also has master control board, and this master control board can produce pulse-width control signal 102 and amplitude control signal 103 according to this mode of operation.Namely the pulse-width control signal 102 of this master control board generation is corresponding with the mode of operation of this projector with amplitude control signal 103.This driving circuit 100 can receive pulse-width control signal 102 and amplitude control signal 103.This driving circuit 100 provides drive current according to this pulse-width control signal 102 and amplitude control signal 103.Namely, when this projector is in the first mode of operation, the first pulse-width control signal and the first amplitude control signal is generated; When this projector is in the second mode of operation, generate the second pulse-width control signal and the second amplitude control signal.Namely different according to this mode of operations, generates the pulse-width control signal 102 corresponding with this mode of operation and amplitude control signal 103, and this pulse-width control signal 102 and amplitude control signal 103 is transferred to driving circuit 100, to regulate 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, thus the mode of operation that this projector is different corresponds to the different wave of this drive current, is regulated and controled the luminescence of this light source 101 by the drive current of different wave.Such as, 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 being irradiated on the colour wheel R/G/B block of this rotation, to produce the light with RGB tri-look sequential, because this drive current has the waveform corresponding with RGB tri-look sequential, by regulating and controlling the waveform of this drive current, light intensity on this colour wheel R/G/B block is radiated at respectively to regulate and control this LED light source or LASER Light Source, thus achieve the regulation and control of the RGB tri-look sequential light to the generation of this light source 101, and then achieve the adjustment optimization to projector's display frame.
This driving 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 DC/DC controller, and this DC/DC controller has pulse-length modulation end 104, control end 105, gate control end 107, current sense end 109 and pulse-length modulation output terminal 108.The pulse-length 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 controls 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-length modulation output terminal 108 is electrically connected at this pulse width control unit 112, and this pulse-length modulation output terminal 108 controls this pulse width control unit 112 according to the pulse-width control signal 102 received, to regulate the pulsewidth (or dutycycle) 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 passes through the discharge and recharge of switch control rule energy-storage travelling wave tube, with the size of current regulating this DC source to export.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 is detected feeds back to the current sense end 109 of signaling control unit 106.Pulse width control unit 112 is electrically connected at the pulse-length modulation output terminal 108 of this signaling control unit 106, and this pulse width control unit 112 is for regulating and controlling the pulsewidth of this waveform; Such as, 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 to the anode of this light source 101 by current sensing unit 111, this pulse width control unit 112 is connected to the negative electrode of this light source 101.After the mode of operation of this projector is arranged by user, then generate pulse-width control signal 102 and amplitude control signal 103, the pulse-length modulation end 104 of signaling control unit 106 and control end 105 accept this pulse-width control signal 102 and amplitude control signal 103 respectively, this signaling control unit 106 is regulated and controled this amplitude control unit 110 by gate control end 107 according to this amplitude control signal 103, and this signaling control unit 106 is regulated and controled this pulse width control unit 112 by pulse-length modulation output terminal 108 according to this pulse-width control signal 102 simultaneously.Thus the regulation and control achieved drive current amplitude and pulsewidth, namely achieve for the different mode of operation of this projector, generate 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, namely by the waveform of adjustment drive current, achieve the adjustment to projector RGB tri-look sequential light, and then achieve the optimizing regulation to projector's display frame.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, to make this pulse width control unit 112 not work in this wire jumper unit 113 place in circuit.
In order to clearer description the present invention, in conjunction with the physical circuit connection diagram of another embodiment of the present invention, explain explanation further.As shown in Figure 2, be another embodiment of the present invention driving circuit schematic diagram, this driving circuit 200 provides drive current for laser (Laser) light source module.This driving 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 DC/DC controller, and the present embodiment explains for the LT3756 controller of Linear Techn Inc. (Linear).This DC/DC controller has 16 pins and an earth terminal G1.These 16 pins are sequentially 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 PWM_OUT end, and corresponding to the pulse-length modulation output terminal 108 in Fig. 1, this pin one is suitable for the pulse width modulating signal of laser light source module for exporting, and this pin one is connected to this pulse width control unit 204.Pin two is FB end, and whether this pin two is connected to this driving 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 to this current sensing unit 203.Pin 5 is Vc end, and this pin 5 is connected to R9 and C2 composition RC loop, and this pin 5 is for stablizing the voltage circuit of this DC/DC controller.Pin 6 is CTRL end, and this pin 6 corresponds to the control end 105 in Fig. 1, and this pin 6 passes through resistance R18 received current pulse pulse width modulation signal (Current Pulse PWM), the amplitude control signal namely in corresponding diagram 1.This pin 6 is by electric capacity C3 ground connection simultaneously.Pin 7 is 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 R17 and R18, and this pin 7 is by resistance R17 and resistance R16 ground connection simultaneously.Because current impulse pulse-width signal (Current Pulse PWM) is not suitable for this DC/DC controller, thus need to be combined by pin 6 and pin 7, and carry out Integral Processing by electric capacity C3, R16, R17 and R18 to current impulse pulse-width signal (Current Pulse PWM), thus to be applicable to this DC/DC controller.Pin 8 is PWM end, and this pin 8 corresponds to the pulse-length 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 OPENLED end, this pin 9 is connected to signal INTvcc_1 by resistance R10, this INTvcc_1 is transmitted by resistance R15 and R14 by pulse width signal PWM_OUT, and this pin 9 exports a signal Open_1 simultaneously, and this pin 9 is reported for laser light source module open fault.This pin one 0 is SS end, and this pin one 0 is by electric capacity C1 ground connection, and this pin one 0 is for the soft start of this DC/DC controller.Pin one 1 is RT end, and this pin one 1 is by resistance R11 ground connection, and this pin one 1 regulates for the switching frequency of this DC/DC controller.Pin one 2 is SD/UV end, and this pin one 2 is connected to input voltage Vcc1 by resistance R13, and simultaneously by resistance R12 ground connection, this pin one 2 is for the closedown of this DC/DC controller or under-voltage sensing.Pin one 3 is INTVcc end, and this pin one 3 connects INTvcc_1, and simultaneously by electric capacity C4 ground connection, this pin one 3 is for providing stabilized voltage supply for DC/DC controller internal load, raster data model and PWM drive.Pin one 4 is 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 SENSE end, this pin one 5 is connected to this amplitude control unit 202, and this pin is for detecting the control electric current in amplitude control unit 202, and pin one 6 is GATE end, this pin one 6 is connected to 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 work of this DC/DC controller and the protection of chance failure.This DC/DC controller receives amplitude control signal (Current Pulse PWM) by pin 6, and according to this amplitude control signal (Current Pulse PWM), by pin one 6 to regulate and control amplitude control unit 202.This DC/DC controller receives pulse-width control signal (PWM_OUT) by pin 8 simultaneously, and according to this pulse-width control signal (PWM_OUT), by pin one to regulate and control pulse width control unit 204.This DC/DC controller is connected to current sensing unit 203 by pin 3 and pin 4, to detect the drive current size exporting to laser light source module.The pulse-width control signal (PWM_OUT) that this DC/DC controller receives according to it and amplitude control signal (Current Pulse PWM), realize the regulation and control to amplitude control unit 202 and pulse width control unit 204 respectively, and then achieve the regulation and control to the drive current 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 dutycycle).Namely pass through the regulation and control of amplitude control unit 202 and pulse width control unit 204, the regulation and control of the waveform to this drive current can be realized.This laser light source module, under the driving of this drive current, can generate the light of redgreenblue sequential, thinks that this projector provides redgreenblue light source.Thus the light of this redgreenblue sequential and the waveform of this drive current corresponding, namely redgreenblue is respectively to should the waveform in difference interval of 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) generate according to the mode of operation of this projector simultaneously, therefore the specific operation mode of this projector is to should the specific waveforms of drive current, this laser light source module generates the light of the redgreenblue sequential corresponding with this specific waveforms.Namely the light of this redgreenblue sequential and the mode of operation of this projector corresponding.When the mode of operation of user to this projector switches, the adjustment to this projector's redgreenblue light can be realized, 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, direct 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 R3, thus this DC/DC controller can control 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 R15 ground connection; the source electrode of a N channel field-effect pipe Q1 is connected to its grid by resistance R4 simultaneously; thus this DC/DC controller can detect 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 to one end of this inductance L 1, and the other end of this inductance L 1 is connected to this direct supply 26V_DC.In addition, be parallel with diode D1 between the source-drain electrode of a N channel field-effect pipe Q1, this diode D1 can prevent from becoming very negative at the voltage of the Shi Burang drain electrode of application and damaging a N channel field-effect pipe Q1.Namely this diode D1 is for the protection of a N channel field-effect pipe Q1.This inductance L 1 one end is by stabilivolt D3 output driving current, and this stabilivolt D3 prevents the backflow of drive current.This DC/DC controller 201 passes through the conducting of control the one N channel field-effect pipe Q1 and the time of cut-off, to control the energy being stored in inductance L 1.When the ON time of a N channel field-effect pipe Q1 is longer, then the electric energy be stored in electric pole L1 is also larger, and the drive current so exporting to laser light source module is also larger, and namely 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), then the amplitude of this drive current regulates and controls according to amplitude control signal (Current Pulse PWM).The pulse width cyclical variation in time of this amplitude control signal (Current Pulse PWM), so the amplitude of this drive current is time to time change according to this amplitude control signal.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 should the various amplitude of drive current.In order to the principle of adjustment and control of clearer description redgreenblue.As shown in Figure 3, for this driving circuit receives the waveform of amplitude control signal (Current Pulse PWM) and the waveform of the drive current corresponding with it.Such as, when the ripple of amplitude control signal (Current Pulse PWM) wide narrow time, the drive current now exporting to laser light source module is just less, and now corresponding red R sequential, when the ripple of amplitude control signal (Current Pulse PWM) is wide, the drive current now exporting to laser light source module is just larger, and now corresponding red green G sequential, be normal when the ripple of amplitude control signal (Current Pulse PWM) is wide, the drive current now exporting to laser light source module is just normal, and now corresponding blue B sequential.Namely this laser light source module exports the light of the redgreenblue sequential corresponding with this drive current waveform, and redgreenblue is respectively to should various amplitude in drive current waveform.When user adjusts this projector's mode of operation, this amplitude control unit (Current Pulse PWM) corresponding change, the waveform also corresponding change of this drive current, the light also corresponding change of the redgreenblue sequential that this laser light source module produces, and then realize this projector's display frame color adjustment.
This driving circuit 200 also comprises current sensing unit 203, this current sensing unit 203 comprises resistance R1, this resistance R1 one end is connected to the negative electrode of stabilivolt D3 in amplitude control unit and the pin 3 of this DC/DC controller, thus this pin 3 can detect electric signal ISP_1, this resistance R1 other end is connected to the anode Laser_1+ of this laser light source module and the pin 4 of this DC/DC controller, thus this pin 4 can detect electric signal ISN_1.The drive current that this current sensing unit 203 flows through detected by this DC/DC controller by pin 3 and pin 4, thus this DC/DC controller can detect the size of this drive current in real time, avoids when drive current damages circuit extremely.
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 R7, 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.Connected by diode D2 between the source-drain electrode of the 2nd N channel field-effect pipe Q2, this diode D2 can prevent from becoming very negative at the voltage of the Shi Burang drain electrode of application and damaging the 2nd N channel field-effect pipe Q2.Namely 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 by the 2nd Q2 conducting of N channel field-effect pipe and cut-off, thus realizes the regulation and control of the pulsewidth (or dutycycle) to the drive current flowing through laser light source module, and namely this pulse width control unit 204 regulates and controls the waveform widths of this drive current.When user switches the mode of operation of this projector, pulse-width control signal (PWM_OUT) the corresponding change that this master control board exports, the so pulsewidth (or dutycycle) of this drive current also just corresponding change.This pulse width control unit 204 also has wire jumper unit JW_1, and this wire jumper unit JW_1 one end is connected to the grid of the 2nd N channel field-effect pipe Q2 by resistance R8, 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, namely this laser light source module is directly connected with the pin one of this DC/DC controller, and so the 2nd N channel field-effect pipe Q2 is shorted.Namely when not adjusting the pulsewidth of drive current, wire jumper unit JW_1 can be connected, not working to make the 2nd N channel field-effect pipe Q2.
In order to this driving circuit of clearer description, the principle of work of this driving circuit is as follows:
This projector has the first mode of operation and the second mode of operation, when this projector is in 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 this pulse width control unit and amplitude control unit respectively, generate the first waveform of drive current; When this projector is in 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 this pulse width control unit and amplitude control unit respectively, generate the second waveform of drive current.Wherein, this first waveform is corresponding with this projector first mode of operation, and this second waveform is corresponding with this projector 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 the different and inequality proportion of pulsewidth, and the drive current power of the second waveform is less than the drive current power of the first waveform.When user is in switching first mode of operation and the second mode of operation, user wishes to reduce projector's power consumption, and when changing the display frame color quality of this projector, such as this first mode of operation and the second mode of operation are normal mode and battery saving mode, drive current waveform under shown in composition graphs 4 two kind of mode of operation, first mode of operation is normal mode, this first mode of operation is to should the first waveform of 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.Second mode of operation is battery saving mode, this second mode of operation is to should the second waveform of 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 should the various amplitude size of drive current, thus the light intensity of redgreenblue is different, and so this projector's picture display color is also not quite similar.This driving circuit regulates and controls amplitude and the pulsewidth of drive current corresponding to red sequential, green sequential and blue sequential respectively by amplitude control unit and pulse width control unit, thus 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.As shown in following table 1 and table 2,
| Color sequential | Voltage/V | Electric current (amplitude) size/A | Pulsewidth (dutycycle) | 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
| Color sequential | Voltage/V | Electric current (amplitude) size/A | Pulsewidth (dutycycle) | 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 the first mode of operation is normal mode, and wherein, the amplitude size of redgreenblue sequential corresponding drive current is respectively 0.4A, 1.2A, 0.8A, and this drive current power is 4W (=0.2W+2.6W+1.2W); Table 2 is the second mode of operation is battery saving mode, and the amplitude size of redgreenblue sequential corresponding drive current is respectively 0.5A, 0.2A, 0.8A, and this drive current power is 1.9W (=0.3W+0.4W+1.2W).Namely 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 the switching achieved this projector's normal mode and battery saving mode, have adjusted the display frame color quality of this projector simultaneously.Compared in prior art, normal mode is adjusted to battery saving mode, with the adjustment of equal proportion waveform with the situation reducing drive current power, the present invention is adjusted by inequality proportion waveform to reduce drive current power, and adjust color (such as RGB tri-look) allocation proportion simultaneously, thus the state that picture quality maintenance perfect condition or user want can be made, and the negative situation such as cross-color can not be produced because reduction drive current power.
It should be noted that, in embodiment as shown in Figure 4, only have adjusted the amplitude size that this first waveform is corresponding with the light of redgreenblue sequential in this second waveform, to adjust the light of redgreenblue sequential.And in another embodiment of the invention, also by adjusting this first waveform and inequality proportion different from the pulsewidth 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 achieve the adjustment to this projector's display frame color quality.Namely the pulsewidth (dutycycle) adjusted in the corresponding waveform of light of redgreenblue sequential is different.In addition, also can adjust the amplitude of this first waveform and this second waveform and the different and inequality proportion of pulsewidth 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 achieve the adjustment to this projector's display frame color quality.In brief, the first waveform and inequality proportion different from the amplitude of the second waveform can be adjusted separately; Also the first waveform and inequality proportion different from the pulsewidth of the second waveform can be adjusted separately; Also can adjust the first waveform and inequality proportion different with pulsewidth from the amplitude of the second waveform simultaneously.
Present invention also offers 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 driving circuit and light source, this driving circuit provides drive current according to this pulse-width control signal and amplitude control signal to this light source, this light source can generate RGB(RGB) light of three look sequential, wherein, this drive current has the waveform corresponding with RGB tri-look sequential.This driving circuit comprises signaling control unit, amplitude control unit, current sensing unit and pulse width control unit.This signaling control unit is used for receiving and processing 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, when this projector is in 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 this pulse width control unit and amplitude control unit respectively, generate the first waveform of drive current; When this projector is in 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 this pulse width control unit and amplitude control unit respectively, generate the second waveform of drive current, wherein, this first waveform is corresponding with this projector first mode of operation, this second waveform is corresponding with this projector 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 the different and inequality proportion of pulsewidth, 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 pulse width control unit and amplitude control unit respectively, the waveform of the drive current being supplied to light source is regulated and controled.This light source produces the light of RGB tri-look sequential under the driving of this drive current, thus achieves the drive current waveform generating correspondence with it for projector's different working modes, and then achieves the optimizing regulation of the display frame to projector.
The present invention is described by above-mentioned related embodiment, but above-described embodiment is only enforcement example of the present invention.Must it is noted that the embodiment disclosed limit the scope of the invention.On the contrary, 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 (7)
1. a driving circuit, this driving circuit is used for projector, this driving circuit is connected to the light source of this projector, this projector can allow its mode of operation of user preset, and produces pulse-width control signal and amplitude control signal according to this mode of operation, and this driving 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 it is characterized in that, this driving 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, this amplitude control signal is for controlling the amplitude of this waveform, this signaling control unit is DC/DC controller, and this DC/DC controller has pulse-length modulation end, control end, gate control end and pulse-length modulation output terminal;
Amplitude control unit, be electrically connected at this signaling control unit, this amplitude control unit is used for the amplitude adjusting this waveform according to this amplitude control signal, this amplitude control unit comprises a N channel field-effect pipe, direct supply and inductance, the grid of the one N channel field-effect pipe is connected to 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 to one end of this inductance, and the other end of this inductance is connected to this direct supply;
Pulse width control unit, be electrically connected at this signaling control unit, this pulse width control unit is used for the pulsewidth adjusting this waveform according to this pulse-width control signal, 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-length modulation output terminal 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;
Wherein, this projector has the first mode of operation and the second mode of operation, when this projector is in the first mode of operation to 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 this pulse width control unit and amplitude control unit respectively, in order to generate the drive current of the first waveform; When this projector is in the second mode of operation to 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 this pulse width control unit and amplitude control unit respectively, in order to generate the drive current of the second waveform, wherein, the amplitude of this first waveform and this second waveform and/or the different and inequality proportion of pulsewidth, and the drive current power of the second waveform is less than the drive current power of the first waveform.
2. driving circuit as claimed in claim 1, it is characterized in that, this light source comprises LED light source or LASER Light Source, and this amplitude control unit is connected to the anode of this light source, and this pulse width control unit is connected to the negative electrode of this light source.
3. driving circuit as claimed in claim 1, it is characterized in that, this DC/DC controller has current sense end.
4. driving circuit as claimed in claim 3, it is characterized in that, the pulse-length modulation termination of this DC/DC controller receives this pulse-width control signal, and the control end of this DC/DC controller receives this amplitude control signal.
5. driving circuit as claimed in claim 3, it is characterized in that, this driving circuit also comprises current sensing unit, this current sensing unit is electrically connected at this amplitude control unit, this current sensing unit is connected to the current sense end of this DC/DC controller simultaneously, and this DC/DC controller senses this drive current by this current sensing unit.
6. driving circuit as claimed in claim 3, it is characterized in that, this pulse width control unit also has wire jumper unit, and time between the pulse-length modulation output terminal that this wire jumper unit is linked into this light source and this DC/DC controller, this pulse width control unit does not work.
7. 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 driving circuit and light source, this driving 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 driving circuit is the driving circuit described in the claims 1 to 6 any.
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| CN107664905A (en) * | 2016-07-29 | 2018-02-06 | 深圳市光峰光电技术有限公司 | The method of projection arrangement, light-source system and its control electric current |
| CN111223427B (en) * | 2018-11-23 | 2023-11-24 | 中强光电股份有限公司 | Projection device and method for operating the same |
| 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 |
| CN113015294B (en) * | 2019-12-19 | 2025-04-22 | 深圳光峰科技股份有限公司 | Current control circuit, method and projection device |
| CN111556633B (en) * | 2020-05-26 | 2023-05-05 | 广州彩熠灯光股份有限公司 | Control circuit and lighting control system |
| CN116794917A (en) | 2022-03-18 | 2023-09-22 | 中强光电股份有限公司 | Projection device, illumination device thereof and light source driving method |
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