CN209028402U - Optical projection system - Google Patents
Optical projection system Download PDFInfo
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- CN209028402U CN209028402U CN201821927746.7U CN201821927746U CN209028402U CN 209028402 U CN209028402 U CN 209028402U CN 201821927746 U CN201821927746 U CN 201821927746U CN 209028402 U CN209028402 U CN 209028402U
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Abstract
The utility model provides a kind of optical projection system.Optical projection system includes lighting module, filter wheel, control device, light valve and projection lens.The power supply of lighting module provides driving current to drive light source to provide illuminating bundle.Filter wheel receives illuminating bundle and provides multiple filtering color beams.Illuminating bundle forms the first filtering color beam by filter wheel in the first period, and the second filtering color beam is formed by filter wheel in the second period, plurality of filtering color beam includes that the first filtering color beam with second filters color beam, further includes the intermediate filtered color beam formed when intermediate period when illuminating bundle between the first period and the second period passes through filter wheel.Control device is to control power supply, so that power supply provides driving current from the first period, intermediate period to the second period lasts.The utility model by reduced in projection process close the number of Laser Power Devices and reduce change dramatically due to driving current and caused by abnormal sound.
Description
Technical field
The utility model relates to a kind of optical projection systems.
Background technique
General optical projection system will use laser as light source, and generate it using fluorescent powder wheel (phosphor wheel)
On the coloured light of his color, such as blue laser excitated fluorescent powder wheel green with or yellow green light or yellow light are generated with fluorescent powder
Light beam.However, the coloured light that fluorescent powder wheel is excited has wider spectrum or color more undesirable, so optical projection system can also
Filter wheel (filter wheel) is arranged in pairs or groups to provide required primitive color light.
Fluorescent powder wheel and filter wheel are usually to rotate, and respectively have multiple and different color subregions.When hot spot is radiated at
When on the joint of two subregions, the undesirable colour mixture light of optical projection system can be generated, for example, the joint of two subregions claims
For spoke area (spoke).Existing optical projection system can select to reduce the defeated of colour mixture light in a manner of closing light source at spoke area
Out, being substantially reduced for brightness is but caused.During light source switch, the variation of driving current is too big, and optical projection system is caused to use
When issue abnormal sound, allow user to perplex.
" background technique " paragraph is used only to help to understand the content of the present invention, therefore is taken off in " background technique " paragraph
The content of dew may include some known technologies without constituting road known to those skilled in the art.In " background technique " paragraph institute
The content of exposure does not represent the content or the utility model one or more embodiment problem to be solved, practical at this
It has been readily known to those persons skilled in the art or has recognized before novel application.
Utility model content
The utility model provides a kind of optical projection system, can avoid or reduce in projection process because light source switch is produced
Raw abnormal sound.
The other objects and advantages of the utility model can be obtained from the technical characteristic disclosed by the utility model into one
The understanding of step.
It is to propose one kind up to one of above-mentioned or part or all of purpose or other purposes, an embodiment of the utility model
Optical projection system.Optical projection system includes lighting module, filter wheel, control device, light valve and projection lens.Lighting module is to provide
Illuminating bundle and lighting module include providing the power supply of driving current and being driven by driving current and provide illumination light
The light source of beam.Filter wheel is configured on the transmission path of illuminating bundle, to receive illuminating bundle and provide multiple filtering coloured light
Beam, wherein illuminating bundle forms the first filtering color beam and illuminating bundle in the second period in the first period by filter wheel
By filter wheel, the second filtering color beam is formed, wherein these filtering color beams include the first filtering color beam and the second filtering
Color beam, wherein these filtering color beams further include when intermediate period of the illuminating bundle between the first period and the second period is logical
The intermediate filtered color beam formed when crossing filter wheel.Control device to control power supply so that power supply from the first period, it is intermediate when
Section provides driving current to the second period lasts, to drive light source.Light valve is configured in the transmitting road of these filtering color beams
On diameter, these filtering color beams are converted into image strip.Projection lens is configured on the transmission path of image strip, is used
Image strip is converted into projected light beam.
It is to propose one kind up to one of above-mentioned or part or all of purpose or other purposes, an embodiment of the utility model
Optical projection system.Utility model optical projection system includes lighting module and control device.Lighting module includes power supply and light source, the power supply
It can be controlled by control device, to provide the driving current for being used for light source.
Based on above-mentioned, the embodiments of the present invention at least have effects that following one of advantage or.The utility model
Optical projection system do not need to close the power supply of laser in projection process, but by the driving of laser of the adjustment at spoke area
Size of current come avoid or reduce because driving current change dramatically caused by abnormal sound.
In order to make the above-mentioned features and advantages of the utility model more obvious and understandable, special embodiment below, and cooperate attached drawing
It elaborates.It needs to illustrate, it is illustrated below clearly to illustrate the concept of the utility model and the equivalents of this case utility model
May not scale, and can for matching literal record and the label of clipped element.
Detailed description of the invention
Fig. 1 is the schematic diagram according to a kind of optical projection system of an embodiment of the utility model.
Fig. 2 is the control method process according to a kind of driving current of optical projection system of an embodiment of the utility model
Figure.
Fig. 3 is the block schematic diagram according to a kind of control device of an embodiment of the utility model.
Fig. 4 A and Fig. 4 B is the schematic diagram according to a kind of driving current of an embodiment of the utility model respectively.
Fig. 5 is the schematic diagram according to a kind of driving current of another embodiment of the utility model respectively.
Description of symbols
100: optical projection system
110: lighting module
112: power supply
114: light source
120: filter wheel
130: control device
132: processor
134: current control circuit
140: light valve
150: projection lens
200: the control method of driving current
BL: illuminating bundle
CS: control signal
DS: driving signal
Id: driving current
Id1: the first driving current
Id2: the second driving current
Id3: third driving current
Im, Im1, Im2, Im3: midway drive electric current
IL: image strip
IMS: current modulated
FL: filtering color beam
FL1: the first filtering color beam
FL2: the second filtering color beam
FLM: intermediate filtered color beam
SW1~SW4: switch
T1: the first period
T2: the second period
T3: third period
TM: intermediate period
PL: projected light beam
S210~S230: the step of the control method of driving current.
Specific embodiment
Aforementioned and other technology contents, feature and effect in relation to the utility model, one in following cooperation attached drawing are preferred
In the detailed description of embodiment, can clearly it present.The direction term being previously mentioned in following embodiment, such as: upper and lower, left,
It is right, front or rear etc., it is only the direction with reference to attached drawing.Therefore, the direction term used is for illustrating opposite positional relationship, connecting
Relationship or other relationships are connect, are not used to limit the utility model.
Fig. 1 is the schematic diagram according to a kind of optical projection system of an embodiment of the utility model.Optical projection system 100 includes shining
Bright module 110, filter wheel 120, control device 130, light valve 140 and projection lens 150.Lighting module 110 provides illumination light
Beam BL.Lighting module 110 includes power supply 112 and light source 114.Power supply 112 provides driving current Id, and light source 114 is by driving electricity
Stream Id is driven and provides illuminating bundle BL.Filter wheel 120 is configured on the transmission path of illuminating bundle BL, to receive photograph
Mingguang City beam BL and the multiple filtering color beam FL of offer.Multiple filtering color beam FL include that first formed in the first period crosses colour filter
Light beam FL1, the second intermediate filtered color beam for filtering color beam FL2 and being formed in intermediate period formed in the second period
FL3, wherein for intermediate period between the first period and the second period, intermediate period is, for example, spoke area (spoke) period.
Control device 130 is to control power supply 112, so that power supply 112 is held from the first period, intermediate period to the second period
Driving current Id is provided, continuously to drive light source 114.Light valve 140 is configured on the transmission path of these filterings color beam FL, is used
These filterings color beam FL is converted into image strip IL.Projection lens 150 is configured on the transmission path of image strip IL,
Image strip IL is converted into projected light beam PL.Projected light beam PL can be projected on screen or wall, to show projection
Picture.
Fig. 2 is the control method process according to a kind of driving current of optical projection system of an embodiment of the utility model
Figure.Fig. 1 please arrange in pairs or groups referring to Fig. 2, the control method 200 of Fig. 2 can be used for the optical projection system 100 of Fig. 1.It arranges in pairs or groups below optical projection system
Each item or device in 100, illustrate the process of control method 200.
In step S210, in the first period, control device 130 control power supply 112, with provide the first driving current to
Light source 114, generated illuminating bundle BL form the first filtering color beam FL1 by filter wheel 120.Then, in step
In S220, in intermediate period, control device 130 controls power supply 112, produced to provide midway drive electric current to light source 114
Illuminating bundle BL intermediate filtered color beam FL3 is formed by filter wheel 120.Then, in step S230, control device
130 control power supplys 112, to provide the second driving current to light source 114, generated illuminating bundle BL passes through filter wheel 120
Form the second filtering color beam FL2.From the first period, intermediate period, to the second period, power supply 112 sustainably provides driving
Electric current Id is to light source 114, to drive light source 114 to shine.
Other relevant implementation details set forth below.
Specifically, power supply 112 for example can be connected to driving current generation circuit.Control device 130 provides driving signal
DS, driving current generation circuit external voltage made of converting through driving signal DS provide driving current Id.Or
Person, power supply 112 itself include the voltage source of such as battery.For example, the driving current generation circuit of battery is connected to by electricity
Pond power supply, thus driving current Id provided by being adjusted according to driving signal DS.Light source 114 is, for example, by light emitting diode
(LED) or the diode (led) module of laser diode wafer (Laser Diode, LD) composition monochromatic light beam, can be provided, such as
Blue light beam, red beam, system that but not limited to this.
In one embodiment, lighting module 110 can also include the (not shown)s such as Wavelength converter, beam splitter, but
It does not limit.Wavelength converter is the optics to make short-wavelength beam be converted into the long wavelength light beam relative to short-wavelength beam
Element, beam splitter are the optical element with light splitting function.Illuminating bundle BL may include the light beam issued by light source 112, lead to
Light beam and/or other reflections or deflecting light beams after crossing the light beam after Wavelength converter is converted, being divided by beam splitter.
For example, Wavelength converter can be fluorescent powder wheel (Phosphor Wheel), settable on fluorescent powder wheel
At least one wavelength-converting region and penetrating region have embedded photoluminescent material (e.g. fluorescent powder) on wavelength-converting region, can be with
It receives short-wavelength beam and generates corresponding commutating optical beam by luminescence generated by light phenomenon, penetrating region can then allow incident light beam
It penetrates.Alternatively or additionally, fluorescent powder wheel may include the echo area for reflecting incident beam.Beam splitter can have for not
The selectivity of co-wavelength can be divided according to wavelength (color), such as spectroscope (Dichroic Mirror, DM), but not
As limitation.
In the present embodiment, for example, light source 112 can provide blue laser, and blue laser passes through Wavelength converter
After be converted into such as yellow light beam.Yellow light beam is divided into red beam and green beam by beam splitter.Alternatively, blue swashs
Light is directly changed into red light and green light after passing through Wavelength converter.Illuminating bundle BL includes the light of these different colours
Beam.
In the present embodiment or other embodiments, filter wheel 120 can be optical filtering colour wheel (color filter wheel).Filter
Halo 120 has at least one filter area to allow the light beam of different colours by generating filtering coloured light.In the present embodiment,
Illuminating bundle BL will form the filtering color beam of a variety of different colours by filter wheel 120, and the utility model is not intended to limit filtering
The color and number of color beam.
Light valve 140 means digital micromirror elements (Digital Micro-mirror Device, DMD), silica-based liquid crystal panel
(Liquid-crystal-on-silicon Panel, LCOS Panel) or liquid crystal display panel (Liquid Crystal
Panel, LCD) etc. the one of spatial light modulators or more persons.Received homogeneous beam is converted into image light about light valve 140
The method of beam, detailed step and embodiment can be obtained enough teachings by those skilled in the art, suggest and implement to say
It is bright, therefore repeat no more.
Combination of the projection lens 150 for example including one or more optical mirror slips with diopter, for example including concave-concave
The various combinations of the non-planar eyeglass such as lens, biconvex lens, concave-convex lens, meniscus, plano-convex lens and plano-concave lens.?
In one embodiment, projection lens 150 also may include planar wave eyeglass.The utility model to the kenel of projection lens 150 and
Its type is simultaneously without restriction.
Fig. 3 is the block schematic diagram according to a kind of control device of an embodiment of the utility model.For example, it controls
Device 130 includes processor 132 and current control circuit 134, and wherein current control circuit 134 includes multiple switch and driving
Device 136 is limited by taking 4 switch SW1~SW4 as an example, but not in this multiple switch.Processor 132 can be electrically connected and/or signal connects
It is connected to current control circuit 134.Processor 132 can provide control signal CS and current modulated IMS to current control circuit
134.Current control circuit 134 can selectively close off or disconnect switch SW1~SW4 according to control signal CS, and/or according to electricity
Flow the size of modulated signal IMS adjustment driving current Id.
Specifically, switch SW1~SW4 for example corresponds respectively to red light, green light, blue light and spoke area.It opens
One end of any one in the SW1~SW4 of pass can be electrically connected and/or signal is connected to processor 132, to be mentioned according to processor 132
The current modulated IMS of confession is subject to closing or opening.The other end of any one in switch SW1~SW4 may be electrically connected to driving
Device 136.For example, switch SW1~SW4 is subject to closing or opening according to control signal CS.For example, switch SW1 closure is meant
The state of switch conduction, switch SW1 disconnect the state for meaning switch cut-off.Driver 136 is electrically connected with switch SW1~SW4, and
And processor 132 is electrically connected to by least one of switch SW1~SW4.
In the present embodiment, when one of switch SW1~SW4 is connected, remaining switch is ended, such as works as filter
When halo 120 corresponds to the blue light period, closure switch SW3, and the circuit that switch SW1, SW2, SW4 are connected is disconnected, it is just blue
For coloured light, current modulated IMS provided by processor 132 is transmitted to driver 136, to drive light by power supply 112
Source 114, to issue the blue laser of appropriate intensity.In the present embodiment or other embodiments, when filter wheel 120 corresponds to wheel
When the spoke area period, closure switch SW4, and disconnect the circuit that switch SW1~SW3 is connected.For spoke area, correspond to centre
The current modulated IMS of driving current is transmitted to driver 136, and driver 136 is based on included in current modulated IMS
Information relevant to size of current and driving signal DS is provided, with control power supply 112 adjust driving current size.
For example, by one of multiple switch SW1~SW4 of closing or opening according to control signal CS
Person, driver 136 are electric according to the provided driving of duty ratio (duty ratio) modulation power supply 112 of current modulated IMS
Flow Id.
Fig. 4 A and Fig. 4 B is the schematic diagram according to a kind of driving current of an embodiment of the utility model respectively.Fig. 4 A with
The driving current Id of Fig. 4 B can be generated using the system or method of Fig. 1 to Fig. 3 embodiment.For example, driving current Id when
Section T1, period T2 is identical as the current value of period T3, is all driving current Ic, in the current value also phase of each intermediate period TM
It together, is all driving current Im.This is that as an example, driving current Id may be the same or different in these periods.
In the embodiment of Fig. 4 A and Fig. 4 B, for example, filter wheel 120 has the first filter area being configured adjacently, the
Two filter areas and third filter area.Illuminating bundle BL can in turn period T1, period T2 and period T3 be irradiated to the first filter area,
Second filter area and third filter area, to provide the first filtering color beam, the second filtering color beam and third filtering coloured light respectively
Beam.It is, for example, red light, green light and blue light that first filtering color beam, the second filtering color beam and third, which filter color beam,
But it does not limit.
In addition illustrate, in one embodiment, when the light that light source 112 issues is blue laser, and in period T3 be
When irradiating filter wheel 120 by the blue laser in illuminating bundle BL, third filter area can be replaced with penetrating region, and blue laser is logical
The third that penetrating region is crossed as this specification filters color beam.The utility model is to the structure of filter wheel 120 and configuration and unlimited
System.
In the present embodiment, in the intermediate period TM between period T1 and period T2, the irradiated region of illuminating bundle BL from
First filter area is moved to the second filter area and forms intermediate filtered color beam.Intermediate period between period T2 and period T3
In TM, illuminating bundle BL irradiated region is moved to third filter area from the second filter area and forms another intermediate filtered color beam.Together
Reason, can also have to form the intermediate period TM of another intermediate filtered color beam, so according to filter between period T3 and latter period
The configuration of halo is recycled.
Firstly, period T1, period T2 and intermediate period TM can be referred to as during being transitioned into period T2 for period T1
First period, the second period and intermediate period.First period T1, intermediate period TM can be continuous with the second period T2, and when centre
The length of section TM is smaller than the length of the first period T1 or the second period T2.First filtering color beam, second filtering color beam with
Intermediate filtered color beam can the first filtering color beam FL1, the second filtering color beam FL2 and intermediate filtered coloured light in corresponding diagram 1
Beam FL3.
During the first period T1, closure switch SW1 disconnects switch SW2~SW4, and power supply 112 provides the first driving current
(current value Ic), illuminating bundle BL provided by the first filter area of filter wheel 120 first filtering color beam FL1 (such as
It is red light).In the second period T2, closure switch SW2 disconnects switch SW1, SW3, SW4, and power supply 112 provides the second driving
Electric current (for example, current value equally can be Ic), illuminating bundle BL is by the second filter area of filter wheel 120 to provide the second filtering
Color beam FL2 (e.g. green light).
In intermediate period TM between the first period T1 and the second period T2, closure switch SW4, disconnection switch SW1~
SW3, power supply 112 provide midway drive electric current (for example, current value is Im), and illuminating bundle BL is irradiated to the first filter of part simultaneously
Light area and the second partial filter area, and form intermediate filtered color beam.Therefore, intermediate filtered color beam can cross colour filter for first
The mixed light of light beam and the second filtering color beam.In intermediate period TM, light valve 140 can be closed.
In order to avoid or reduce driving current Id amplitude of variation it is excessive and abnormal sound is caused to occur, from the first driving current to
The difference of midway drive electric current can be no more than the half of both this wherein the greater.Specifically, the numerical value of midway drive electric current
It can be in the range of 2 times of 1/2 to the first driving current of the first driving current.That is, Ic/2≤Im≤2Ic.In addition,
In order to further avoid or reduce abnormal sound, the second driving current also can be the 1/2 to the 2 of midway drive electric current of midway drive electric current
In the range of times.That is, Im/2≤Ic≤2Im.
In other words, the absolute value of midway drive electric current and the difference DELTA I of the first driving current are less than or equal to intermediate drive
The half of streaming current and the first driving current wherein the greater.Alternatively or additionally, the second driving current and intermediate drive
The absolute value of the difference DELTA I of streaming current be less than or equal to the second driving current and midway drive electric current wherein the greater two/
One.
In intermediate period TM, light valve 140 can be closed.Furthermore, in order to reduce optical projection system 100 energy consumption and/
Or additional thermal energy is reduced, the lesser midway drive electric current of numerical value can be selected in the numberical range of above-mentioned intermediate driving current,
Such as reduce the size of midway drive electric current.Therefore, midway drive electric current can be greater than or equal to the first driving current 1/2, and
Less than or equal to the first driving current, i.e. the numerical value of midway drive electric current is adjusted to Ic/2≤Im≤Ic.In addition, in order to promote energy
Source efficiency and/or image brilliance can select the biggish second driving electricity of numerical value in the numberical range of above-mentioned second driving current
Stream is greater than or is equal to midway drive electric current, and is less than or equal to 2 times of midway drive electric current, i.e. the second driving current
Numerical value is adjusted to Im≤Ic≤2Im.
In the embodiment of Fig. 4 A, the current value Im of midway drive electric current is less than the current value of first and second driving current
Ic, but it is greater than the 1/2 of current value Ic.In the embodiment of Fig. 4 B, the current value Im of midway drive electric current is greater than first and second
The current value Ic of driving current, but less than 2 times of current value Ic.
It is also Ic in the current value size of the driving current Id of period T3, therefore period T2 is transitioned into for period T3,
The driving current adjustment mode of intermediate period TM is similar to above-mentioned explanation, and details are not described herein.
Generally, in order to avoid or reduce generate abnormal sound into the projection process of the second period T2 from the first period T1,
130 controllable power 112 of control device, to constantly provide driving current Id, that is to say, that light source 114 in this process
It is not turned off.In intermediate period TM, 130 controllable power 112 of control device, to adjust driving current Id size.In order into
One step reaches energy-efficient purpose, and control device 130 can control midway drive electric current to be greater than or equal to the first driving current and second
The half of the greater in driving current, and the smaller being less than or equal in the first driving current and the second driving current
2 times.
Fig. 5 is the schematic diagram according to a kind of driving current of another embodiment of the utility model.Fig. 5 embodiment with
Fig. 4 A, the embodiment of Fig. 4 B are similar, equally generate using optical projection system 100 and control method 200.Show as shown graphically in fig 5, the
During one period T1, the second period T2 and third period T3, driving current can be different, each centre between these periods
The driving current of period TM also can be different.
For example, the driving current of the first period T1 is the first driving current Id1, and the driving current of the second period T2 is
The driving current of second driving current Id2, third period T3 are third driving current Id3, wherein the first driving current Id1 is less than
Second driving current Id2, the second driving current Id2 is greater than third driving current Id3, and third driving current Id3 is greater than and for example exists
The first driving current value Id1 of next stage is in timing.Between the first period T1, the second period T2 and third period T3
The driving current of intermediate period TM be respectively midway drive electric current Im1, Im2 and Im3.
For for intermediate period TM between period T1 and period T2, in order to avoid or reduce in driving current
Current value generates abnormal sound during changing to Im1 from Id1, midway drive electric current Im1 can be set to be greater than or equal to
The 1/2 of one driving current Id1, and less than or equal to 2 times of the first driving current Id1.Furthermore in order to reduce energy consumption, centre is driven
Streaming current Im1 can be set to be greater than or equal to the 1/2 of the first driving current Id1, and be less than or equal to the first driving current
Id1。
Similarly, in order to avoid or reduce generate during the current value of driving current changes to Id2 from Im1 it is different
Sound, the second driving current Id2 can be set as 1/2 more than or equal to midway drive electric current Im1, and be less than or equal to intermediate drive
2 times of streaming current Im2.That is, when the difference DELTA I of the driving current of two adjacent periods is less than or equal to adjacent two
The 1/2 of biggish driving current in section.
Furthermore, it is understood that in the present embodiment, in order to avoid or reduce abnormal sound and reduce the energy consumption in intermediate period TM,
Midway drive electric current Im1 can be set as the greater being greater than or equal in the first driving current Id1 and the second driving current Id2
1/2, and be less than or equal to 2 times of the first driving current Id1 and the smaller in the second driving current Id2.
Similar, for the intermediate period TM between period T2 and period T3, midway drive electric current Im2 can be with
It is set to be greater than or equal to the 1/2 of the second driving current Id2, and is less than or equal to 2 times of third driving current Id3.For
For intermediate period TM between period T3 and period T1, midway drive electric current Im3 can be set to be greater than or equal to
The 1/2 of third driving current Id3, and less than or equal to 2 times of the first driving current Id1.Midway drive electric current Im1, Im2, Im3
It can be set in above-mentioned range identical or not identical, the utility model is not intended to limit.
In conclusion the embodiments of the present invention at least have effects that following one of advantage or.It is practical new at this
In the embodiment optical projection system of type, according to the video signal to be played, optical projection system can obtain illuminating bundle and pass through filter respectively
Corresponding multiple driving current values when multiple filter areas on mating plate adjust midway drive electricity according to these driving currents
Stream, allow driving current amplitude of variation be no more than two adjacent periods in biggish driving current 1/2, to avoid or reduce
Machine in projection process is because of abnormal sound caused by the switch of light source.In practical applications, it corresponds to each filter area of filter wheel
Driving current may be preset because of various requirements such as illumination brightness, image contrast, chroma-luminancees, in this respect
In, midway drive electric current Im1, Im2, Im3 can according to such as first, second and/or third driving current size and partly
Or selectively meet above-mentioned numberical range, to meet the brightness requirement of exported image and/or reduce the demand of noise.It throws
Shadow system need not close power supply in intermediate period, but can close light valve in intermediate period and be not projected out by intermediate filtered coloured light
Come, to safeguard image quality.
The above, the only preferred embodiment of the utility model are implemented when that cannot limit the utility model with this
Range, i.e., it is all according to simple equivalence changes made by the utility model claims book and utility model description with repair
Change, all still belong to the utility model patent covering in the range of.In addition any embodiment or claim of the utility model are not necessary to
Reach whole purposes or advantage or feature disclosed by the utility model.In addition, abstract part and utility model title are only to use
It is used to assist patent document to retrieve, not is used to limit the interest field of the utility model.In addition, this specification or application are special
The terms such as " first " that refers in sharp range, " second " are only to name the title or the different implementations of difference of element (element)
Example or range, and not it is used to the quantitative upper limit of restriction element or lower limit.
Claims (10)
1. a kind of optical projection system, which is characterized in that the optical projection system include lighting module, filter wheel, control device, light valve and
Projection lens, in which:
The lighting module is to provide illuminating bundle and the lighting module includes power supply and light source, in which:
The power supply provides driving current；And
The light source is driven the light source by the driving current and provides the illuminating bundle；
The filter wheel is configured on the transmission path of the illuminating bundle, to receive the illuminating bundle and provide multiple mistakes
Colour filter light beam, wherein the illuminating bundle in the first period by the filter wheel, form the first filtering color beam and described
Illuminating bundle, by the filter wheel, forms the second filtering color beam, wherein the multiple filtering color beam packet in the second period
The first filtering color beam and the second filtering color beam are included, wherein the multiple filtering color beam further includes when the photograph
Intermediate period of Mingguang City's beam between first period and second period passes through the intermediate mistake that is formed when the filter wheel
Colour filter light beam；
The control device is to control the power supply, so that the power supply is from first period, the intermediate period to institute
The driving current is provided with stating the second period lasts, to drive the light source；
The light valve is configured on the transmission path of the multiple filtering color beam, to convert the multiple filtering color beam
At image strip；And
The projection lens is configured on the transmission path of the image strip, the image strip is converted into projected light
Beam.
2. optical projection system according to claim 1, which is characterized in that first period, second period with it is described
The driving current of intermediate period is respectively the first driving current, the second driving current and midway drive electric current, wherein described
Midway drive electric current is greater than or equal to the 1/2 of first driving current, and is less than or equal to the 2 of first driving current
Times.
3. optical projection system according to claim 2, which is characterized in that the midway drive electric current is greater than or equal to described the
The 1/2 of one driving current, and it is less than or equal to first driving current.
4. optical projection system according to claim 1, which is characterized in that first period, second period with it is described
The driving current of intermediate period is respectively the first driving current, the second driving current and midway drive electric current, wherein described
Second driving current is greater than or equal to the 1/2 of the midway drive electric current, and is less than or equal to the 2 of the midway drive electric current
Times.
5. optical projection system according to claim 4, which is characterized in that second driving current is greater than or equal in described
Between driving current, and be less than or equal to 2 times of the midway drive electric current.
6. optical projection system according to claim 1, which is characterized in that first period, second period with it is described
The driving current of intermediate period is respectively the first driving current, the second driving current and midway drive electric current, wherein described
Midway drive electric current is greater than or equal to the half of the greater in first driving current and second driving current,
And less than or equal to 2 times of the smaller in first driving current and second driving current.
7. optical projection system according to claim 1, which is characterized in that the first filtering described in intermediate filtered color beam system
The mixed light of color beam and the second filtering color beam.
8. optical projection system according to claim 1, which is characterized in that the control device includes processor and current control
Circuit, in which:
The processor is to provide control signal and current modulated；And
The current control circuit controls the size of the driving current according to the control signal and the current modulated,
The current control circuit includes multiple switch and driver, in which:
The multiple switch is electrically connected with the processor, and the multiple switch is closed or is broken according to the control signal
It opens, and
The driver is electrically connected with the multiple switch and the processor, by the institute being closed according to the control signal
Multiple switch one of them is stated, what driver power supply according to the duty ratio modulation of the current modulated provided
The driving current.
9. optical projection system according to claim 1, which is characterized in that in the intermediate period, the light valve is closed.
10. optical projection system according to claim 1, which is characterized in that first period, the intermediate period with it is described
Second period is continuous, and the length of the intermediate period is less than the length of first period and second period.
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| CN201821927746.7U CN209028402U (en) | 2018-11-22 | 2018-11-22 | Optical projection system |
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| CN201821927746.7U CN209028402U (en) | 2018-11-22 | 2018-11-22 | Optical projection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208697A (en) * | 2018-11-22 | 2020-05-29 | 中强光电股份有限公司 | Projection system and control method of driving current thereof |
-
2018
- 2018-11-22 CN CN201821927746.7U patent/CN209028402U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208697A (en) * | 2018-11-22 | 2020-05-29 | 中强光电股份有限公司 | Projection system and control method of driving current thereof |
| US11022864B2 (en) | 2018-11-22 | 2021-06-01 | Coretronic Corporation | Projection system and control method of driving current therefor |
| CN111208697B (en) * | 2018-11-22 | 2021-07-27 | 中强光电股份有限公司 | Projection system and control method of driving current thereof |
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