CN105467733B - Projection display system and its control method - Google Patents
Projection display system and its control method Download PDFInfo
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Abstract
The present invention provides a kind of projection display system and its control methods, including：Light-source system, the light-source system include Wavelength converter and at least two groups light source, and the light source is for emitting exciting light, and the Wavelength converter is for absorbing the exciting light and generating at least two monochromatic light；Control device for the monochromatic period to be divided into multiple modulation periods, and by controlling the group number that the light source is turned on and off in each modulation period, controls brightness of the monochromatic light within each modulation period；Optic modulating device, for receiving the monochromatic light, and the brightness according to the monochromatic light within each modulation period, the monochromatic grayscale is adjusted to preset gray scale, modulation period need not be split according still further to the duration of each modulation period, that is, the duration of each modulation period opposite can be reduced, so as to realize the display of more multidigit gray scale image.
Description
Technical field
The present invention relates to projection display technique fields, more specifically to a kind of projection display system and its controlling party
Method.
Background technology
Currently, projection display system generally use single spatial light modulator or three spatial light modulators, by RGB
The monochromatic light of three primary colours carries out the display of image on the screen according to sequential or space combination coloured image.But either
Using the system of single spatial light modulator, or using the system of three spatial light modulators, optic modulating device is all can not
An or scarce part.
The light modulation techniques being commonly used include mainly digital optical processing technique, Liquide Crystal On Silicon and liquid crystal display
Technology etc..In digital optical processing technique, optic modulating device is that (Digital Micro mirror Device, number are micro- by DMD
Mirror device), which generally comprises multiple micro mirror units, as shown in Figure 1, micro mirror unit 101 can be in 102 He of position
It is quickly overturn between 103, flip angle can be ± 12 °.When micro mirror unit 101 is in position 103, by incident light 104
It is reflected into emergent light 107, and then is collected by subsequent lens 105, and is incident on screen by projection lens；Work as micro mirror unit
101 be in position 102 when, incident light 104 is reflected into emergent light 106, and then can not be collected by lens 105.Therefore, can lead to
Stop place and the residence time for crossing control micro mirror unit 101, to control the overall brightness of respective pixel on screen.
Here, it is "On" state that we, which define micro mirror unit 101 at position 103, it is "Off" state at position 102,
As shown in Fig. 2, micro mirror unit 101 changes to "Off" state by "On" state, there are one fall time Tf, changed to by "Off" state
"On" state, there are one rise time Tr, we are TfAnd TrIt is referred to as flip-flop transition.In order to make corresponding pixel tool on screen
There is certain brightness, it is desirable that micro mirror unit 101 remains on state within the regular hour, which is To, therefore, micro-
Overturning cycle T=T of mirror unit 101r+To+Tf。
In existing projection display system, as shown in figure 3, monochromatic light P-R, P-G and P-B's that light-source system generates is bright
Degree be to maintain it is constant, only by control optic modulating device in micro mirror unit switch time, to control projection-display image
Overall brightness.For example, in above-mentioned digital optical processing technique, usually by the modulation period of DMD, (its duration is equal to primary lights figure
The cycle duration of picture) multiple modulation periods corresponding to different grayscale are divided into, and each grayscale corresponds to different brightness.
As shown in figure 3, when display image be 4 grayscale, i.e., 24When=16 grayscale, by the modulation period of DMD-R, G, B
4 modulation period t0, t1, t2, t3 are divided into, wherein each the duration of modulation period is equal to t × 2i-n, wherein t is the tune of DMD
Period processed, n are the gradation (in figure 3, n=4) for showing image, i=0,1......, n-1.At this point, different by controlling
The state of micro mirror unit 101 in the modulation period can obtain 2nThe gray scale image of a difference gray-scale intensity.Wherein, minimum effective
The duration T that bit allocation arrivesLSBThe duration T being assigned to for t0, most significant digitMSBFor t3.
When it is 10 to need to be displayed in red grayscale, 10=23+21, then the DMD-R for handling red light keeps in t3 the and t1 periods
"On" state, remaining period remain off state；When needing to show that green grayscale is 12,12=23+22, then green light is handled
DMD-G remain on state in t3 the and t2 periods, remaining period remains off state；When it is 5 to need to be displayed in blue grayscale,
5=22+20, then handle the DMD-B of blue need to remain on state in t2 the and t0 periods, remaining period is "Off" state；Such as figure
Shown in 3.
However, there are significant limitations for this modulation system.In this modulation system, gradation is higher, corresponding
Modulation the period duration it is longer, still, modulation period duration and the limitation of micro mirror unit switch time under, modulation week
The duration that phase can be divided is limited, therefore, when the grayscale of needs is multidigit grayscale, such as grayscale more than 10, modulation period
The modulation period number that can be divided into cannot meet the needs of multidigit grayscale is to modulation period number.That is, existing
Projection display system is only controlling micro mirror unit switch time come by way of controlling projection-display image overall brightness, Neng Goushi
Existing gradation is less, cannot meet demand of the people to the display image with more multidigit grayscale.
Invention content
In view of this, the present invention provides a kind of projection display system and its control method, it is in the prior art to solve
The gradation that projection display system can be realized is less, cannot meet need of the people to the display image with more multidigit grayscale
It asks.
To achieve the above object, the present invention provides the following technical solutions：
A kind of projection display system, including：
Light-source system, the light-source system include Wavelength converter and at least two groups light source, and the light source is for emitting
Exciting light, the Wavelength converter is for absorbing the exciting light and generating at least two monochromatic light；
Control device, for the monochromatic period to be divided into multiple modulation periods, and by controlling each modulation period
The group number that the interior light source is turned on and off controls brightness of the monochromatic light within each modulation period；
Optic modulating device will for receiving the monochromatic light, and the brightness according to the monochromatic light within each modulation period
The monochromatic grayscale is adjusted to preset gray scale.
Preferably, the control device is additionally operable to, by controlling the duration of each modulation period, control the monochromatic light each
Modulate the brightness in the period.
Preferably, at least two groups light source includes laser light source or LED light source.
Preferably, every group of light source includes that the number of light source is identical or different.
Preferably, the light source is modulated light source, and the amplitude of the exciting light of same group of light source transmitting is identical, no
Amplitude with the exciting light of the light source transmitting of group is identical or different.
Preferably, when the light source be modulated light source when, the control device by control it is each modulation the period duration,
What the light source was turned on and off organizes the amplitude of the exciting light of light source transmitting described in number and every group in each modulation period, controls institute
State brightness of the monochromatic light within each modulation period.
Preferably, the optic modulating device includes multiple modulation units, and the control device is additionally operable to according to the list
Coloured light controls corresponding modulation unit in the switch time of each modulation period, by the monochrome in the brightness of each modulation period
The grayscale of light is adjusted to preset gray scale.
Preferably, the projection display system includes an optic modulating device, described in the optic modulating device receives successively
Monochromatic light, and successively according to the monochromatic light in the brightness of each modulation period, the monochromatic grayscale is adjusted to default ash
Rank.
Preferably, the projection display system includes three optic modulating devices, and three optic modulating devices receive respectively
Corresponding monochromatic light, and the brightness according to the monochromatic light received in each modulation period, by the monochromatic grey contrast
It is whole to preset gray scale.
Preferably, the control device be additionally operable to by control each group number for being turned on and off of modulation period inner light source or
The impulse amplitude of each modulation period inner light source, the reversal rate for controlling the modulation unit are less than preset value.
Preferably, the Wavelength converter includes wavelength conversion sheet and driving device, and the wavelength conversion sheet has extremely
Few two light-emitting zones, at least one light-emitting zone are provided with wavelength conversion material, and the driving device is for driving institute
State wavelength conversion sheet rotation so that different light-emitting zones are sequentially located in the light path of the exciting light.
A kind of projection display system control method is applied to any one of them projection display system as above, including：
The monochromatic period that light-source system generates is divided into multiple modulation periods, the light-source system includes at least two groups
Light source；
By controlling the group number that the light source is turned on and off in each modulation period, the monochromatic light is controlled in each modulation
Brightness in section；
According to brightness of the monochromatic light within each modulation period, the monochromatic grayscale is adjusted to preset gray scale.
Preferably, the control monochromatic light further includes in each process for modulating the brightness in the period：
By controlling the duration of each modulation period, brightness of the monochromatic light within each modulation period is controlled.
Preferably, when the light source is modulated light source, brightness of the monochromatic light within each modulation period is controlled
Process includes：
By controlling the duration of each modulation period, respectively modulating the light source is turned on and off in the period group number and every group
The amplitude of the exciting light of the light source transmitting controls brightness of the monochromatic light within each modulation period.
Preferably, the brightness according to the monochromatic light within each modulation period, the monochromatic grayscale is adjusted
To preset gray scale, specially：
Brightness according to the monochromatic light in each modulation period controls corresponding modulation unit in each switch shape for modulating the period
State adjusts the monochromatic grayscale to preset gray scale.
Compared with prior art, technical solution provided by the present invention has the following advantages：
Light source is divided at least two groups by projection display system provided by the invention and its control method, and each by controlling
The group number that modulation period inner light source is turned on and off controls brightness of the monochromatic light within each modulation period, therefore, there is no need to
Modulation period is split according still further to the duration of each modulation period, that is to say, that opposite can reduce each modulation period when
It is long, so as to which more modulation periods will be divided into modulation period, to meet the needs of multidigit grayscale is to modulation period number,
And then it can realize the display of more multidigit gray scale image.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the fundamental diagram of the micro mirror unit in optic modulating device；
Fig. 2 is the cycle time distribution map of micro mirror unit；
Fig. 3 is each modulation period state diagram of grayscale modulation system in the prior art；
Fig. 4 is the projection display system modulation principle figure that the embodiment of the present invention one provides；
Fig. 5 is projection display system modulation principle figure provided by Embodiment 2 of the present invention；
Fig. 6 is the projection display system structural schematic diagram that the embodiment of the present invention three provides；
Fig. 7 is the light-emitting zone distribution map on the Wavelength converter that the embodiment of the present invention three provides；
Fig. 8 is the modulation principle figure for the projection display system that the embodiment of the present invention three provides；
Fig. 9 is the structural schematic diagram for the projection display system that the embodiment of the present invention four provides；
Figure 10 is the control method flow chart that the embodiment of the present invention five provides.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Optic modulating device in the present invention includes but not limited to DMD or liquid crystal display (LCOS or LCD).In order to facilitate saying
Bright, following embodiments are illustrated using DMD, but this is not intended to limit the scope of the present invention.
Embodiment one
Present embodiments provide a kind of projection display system, including light-source system, control device and optic modulating device, light source
System includes at least two groups light source and Wavelength converter, and for light source for emitting exciting light, Wavelength converter is sharp for absorbing
It shines and generates at least two monochromatic light, wherein at least two groups light source includes laser light source or LED light source, described every group
The number of light sources that light source includes can be identical or different.In addition, projection display system provided in this embodiment may include three light
Modulating device or an optic modulating device.
The monochromatic period is divided into multiple modulation periods by control device, and modulation period number is drawn according to preset grayscale
Point.Specifically, control device is turned on and off the time by control light source, controls the segmentation of monochromatic light modulation period.Example
Such as, light source opens the time between closing for the first time for the first time, is the time of first modulation period of monochromatic light, light source second
It is secondary to open to the time between second of closing, it is the time of second modulation period of monochromatic light.
After the monochromatic period is divided into multiple modulation periods, within each modulation period, control device can control light
The group number that source is turned on and off, to control the monochromatic brightness of generation.In the present embodiment, light source can be non-adjustable light processed
The amplitude for the exciting light that source, i.e. light source generate is certain, at this point, within the same modulation period, the group number that light source is opened is more,
The amplitude of the exciting light of transmitting is multiplied, and the monochromatic brightness of generation is also multiplied.In other embodiments, light source can
Think modulated light source, such as laser or light emitting diode, at this point, the amplitude of the exciting light of same group of light source transmitting is identical,
The amplitude of the exciting light of the light source transmitting of difference group can be identical or different.
After being modulated to grouping light source by control device, control device is according to the monochromatic light in each modulation period
Brightness, controls modulation unit in corresponding optic modulating device in the switch time of each modulation period, will be described monochromatic
Grayscale is adjusted to preset gray scale.
By taking red monochromatic light P-R as an example, the process that system provided in this embodiment is modulated monochromatic light P-R, such as
Shown in Fig. 4.By can not be for modulated light source, a cycle t of monochromatic light P-R be divided into modulation period t0, t1, t2 and t3,
In the present embodiment, each duration for modulating the period is equal.In modulation period t0, one group of light source is opened, and provides 20=1 unit
Light intensity；In modulation period t1, second group of light source is opened, and provides 21The light intensity of=2 units；In modulation period t2, third group
Light source is opened, and provides 22The light intensity of=4 units；In modulation period t3, the 4th group of light source is opened, and provides 23The light of=8 units
By force.In the present embodiment, light-source system includes four groups of light sources.
At the same time, control device controls corresponding modulation unit, such as the DMD-R (optic modulating device) in Fig. 4
It is shown so that modulation unit modulation period t0 and t2 be "Off" state, as 0, modulation period t1 and t3 be "On" state,
As 1, remaining time t4, t5, t6, t7 are the flip-flop transition of micro mirror unit, to obtain maximum flip-flop transition, can distribute t4,
T5, t6, t7 are equal as possible.In this way, by the modulation of the modulation unit in the modulation of light source and optic modulating device, it is final to realize
Red monochromatic grayscale is：20*0+21*1+22*0+23* 1=10.Wherein, the modulation unit in the present embodiment is preferably micro-
Mirror unit.Each optic modulating device includes thousands of micro mirror unit, and each micro mirror unit is under control of the control means
It is overturn, to realize the modulation to light source, obtains the light of different brightness or grayscale.
In the present invention, the+the second group of required light source largest light intensity=the first group light source intensity light source intensity+... the
N group light source intensities.The present embodiment can realize the change of the intensity of light source by opening one or more groups of light sources, meet different ashes
The brightness demand of rank, to no longer need to be modulated the segmentation of period by the multiple overturning of micro mirror unit, that is to say, that
The overturning number of micro mirror unit within a certain period of time can be reduced, and then can realize follow-up DMD micro mirror units reversal rate
Reduction.Such as：When a certain pixel is needed the light intensity of 5 units, micro mirror unit needs to overturn twice in the prior art, and
The present invention by the modulation to light source, open simultaneously by one group of light source and third group light source in control such as above-described embodiment, this
When micro mirror unit without overturning, to reduce the reversal rate of micro mirror unit.
Light source is divided at least two groups by projection display system provided in this embodiment, and by controlling in each modulation period
The group number that light source is turned on and off controls brightness of the monochromatic light within each modulation period, therefore, there is no need to according still further to each tune
The duration of period processed is split modulation period, that is to say, that the duration that opposite can reduce each modulation period, so as to
More modulation periods will be divided into modulation period, to meet the needs of multidigit grayscale is to modulation period number, and then can be real
The now more display of multidigit gray scale image.
Also, due to projection display system provided in this embodiment, the duration of modulation period is no longer relied only on to be adjusted
Therefore the segmentation of period processed can provide enough flip-flop transitions to micro mirror unit, also there is no need to by shortening micro mirror unit
Flip-flop transition realize more multidigit grayscale.
Embodiment two
Although the group number that the solution of the present invention can be turned on and off by controlling each modulation period inner light source, to realize more
The display of multidigit gray scale image still shows the gradation of image in order to further increase, still need to it is each modulation the period when
Length is controlled, and in order to be used for more times in a modulation period to modulate the period, in addition to shortening turning over for micro mirror unit
Turn except the time, overturning number of the micro mirror unit within a modulation period can also be reduced, that is, reduce the overturning of micro mirror unit
Speed.
Projection display system provided in this embodiment, except through controlling the group that each modulation period inner light source is turned on and off
Number can also be controlled each modulation period inner light source by control device and opened to realize except the more display of multidigit gray scale image
Or the impulse amplitude for the group number or each modulation period inner light source closed, the overturning number for controlling micro mirror unit are substantially less than existing
There is the reversal rate of micro mirror unit in technology, namely by increasing the light source intensity in each modulation period, to reduce micro mirror unit
Time in "On" state is supplied to micro mirror unit to overturn so as to reserve more times.Wherein, when each modulation
Between light intensity in section can be by the pulse amplitude modulation of light source, the group number that can also be opened by adjusting light source increases light source
Intensity.
By taking the modulation of the red monochromatic light P-R of 10 grayscale as an example, if it is default so that the overturning number of micro mirror unit is less than
Value 4, then as shown in figure 5, a cycle t of monochromatic light P-R can be divided into three modulation periods, i.e. t0, t1 and t2.It is modulating
Period t0, one group of light source are opened, and provide 21The light intensity of=2 units；In modulation period t1, second group of light source is opened, and provides 22
The light intensity of=4 units；In modulation period t2, third group light source is opened, and provides 23The light intensity of=8 units, wherein light source system
System includes three groups of light sources.
Meanwhile the on off state of micro mirror unit DMD-R is also as shown in figure 5, micro mirror unit is in modulation period t0 and t2
"On" state is "Off" state in t1, remaining time t3, t4, t5 are the flip-flop transition of micro mirror unit, to obtain maximum overturning
Time, it is equal as possible can to distribute t3, t4, t5.The red monochromatic grayscale being achieved is 21*1+22*0+23* 1=
10.At this point, the overturning number of micro mirror unit is 3, it is less than preset value 4.
Projection display system provided in this embodiment can not only be turned on and off by controlling each modulation period inner light source
Group number, control brightness of the monochromatic light within each modulation period, realize the display of more multidigit gray scale image, and can lead to
The light intensity increased in each modulation period is crossed, reduces the number of modulation period, and then reduce micro mirror unit turning within modulation period
Turn number, reduces the reversal rate of micro mirror unit.
Embodiment three
A kind of projection display system is present embodiments provided, which includes three optic modulating devices, such as Fig. 6
It is shown, including light-source system 501, control device 502 and optic modulating device 503,504 and 505.Wherein, light-source system 501 includes
At least two groups light source and Wavelength converter in the present embodiment, illustrate, light source by taking two groups of light sources 5010 and 5011 as an example
5010 and 5011 are used to transmitting exciting light, and Wavelength converter is used to absorb exciting light and generates at least two monochromatic light,
In, light source 5010 and 5011 can be laser light source, or LED light source.Preferably, using laser light source, when using sharp
When radiant, the speed of Laser Modulation can be improved, to increase the accuracy of modulation.
In the present embodiment, Wavelength converter includes wavelength conversion sheet 5012 and driving device 5013, wavelength conversion sheet
5012 there are at least two light-emitting zones, different light-emitting zones there is different wavelength conversion material, driving device 5013 to use
In driving wavelength conversion sheet 5012 along center axis rotation, so that different wavelength conversion material absorbs exciting light and generates not successively
Same monochromatic light.
Specifically, wavelength conversion sheet 5012 can be the fluorescent powder color wheel with three light-emitting zones, as shown in fig. 7, hair
Light region 601,602 and 603 is sequentially distributed on same annulus, and the wavelength conversion material that light-emitting zone 601 has is red
Fluorescent powder generates red monochromatic light after absorbing exciting light；The wavelength conversion material that light-emitting zone 602 has is green fluorescence
Powder generates green monochromatic light after absorbing exciting light；The wavelength conversion material that light-emitting zone 603 has is blue colour fluorescent powder, is inhaled
Blue monochromatic light is generated after receiving exciting light.Certainly, in other embodiments, the light-emitting zone of wavelength conversion sheet can be in concentric
The distribution of circular or other modes, the present invention is not limited to this.
Wavelength conversion sheet 5012 is rotated by driving device 5013, and light-emitting zone 601,602 and 603 is made to inhale successively
Exciting light is received, red, green and blue monochromatic light are sequentially generated, as shown in fig. 6, these three monochromatic light are by light splitting closing light dress
After setting 506, optic modulating device 503,504 and 505 is respectively enterd, modulated RGB monochromatic light is using light splitting Multiplexing apparatus
It after 506 closing lights, projects on screen, carries out the display of image, wherein light splitting Multiplexing apparatus 506 is preferably TIR prism.
Before this, control device 502 will need the monochromatic period generated to be divided into multiple modulation periods, and pass through
The group number that each modulation period inner light source is turned on and off is controlled, brightness of the monochromatic light within each modulation period is controlled.
Control device 502 receives video or image data after signal processor processes, and schemes according to treated
It is sequentially generated corresponding monochromatic light as display sequence controls light-source system, then passes through optic modulating device and Multiplexing apparatus successively
Afterwards, synthesis needs image to be shown, and projects on screen.
In the present embodiment, control device 502 is also by controlling the time that is turned on and off of light source, when controlling monochromatic light modulation
The segmentation of section.For example, light source opens the time between closing for the first time for the first time, be first, the monochromatic light modulation period when
Between, second of the time opened between closing for the second time of light source, is the time of second modulation period of monochromatic light.Although this
The group number that invention is mainly turned on and off by controlling light source, to control the monochromatic brightness of generation, still, in modulation week
In the case that phase duration and flip-flop transition allow, control device 502 can also be controlled by controlling each duration for modulating the period
Light source processed is turned on and off the time, to control brightness of the monochromatic light within each modulation period.
After the monochromatic period is divided into multiple modulation periods, within each modulation period, control device 502 can also be controlled
The group number that light source processed is turned on and off, to control the monochromatic brightness of generation.In the present embodiment, light source is preferably modulated light
Source, such as laser diode or light emitting diode, at this point, the amplitude of the exciting light of same group of light source transmitting is identical, different groups
The amplitude of exciting light of light source transmitting can be identical or different.When light source is modulated light source, control device 502 can lead to
It crosses and controls the duration of each modulation period, respectively modulates light source hair described in the group number and every group that the light source is turned on and off in the period
The amplitude for the exciting light penetrated controls brightness of the monochromatic light within each modulation period, to further expand monochromatic light
The adjustment mode and range of degree, and then can realize the display of more multidigit gray scale image.
After the modulation of control device 502, has the monochromatic light of multiple modulation periods after the devices such as lens, enter
Optic modulating device 503,504 and 505, optic modulating device 503,504 and 505 receive monochromatic light, and according to the monochromatic light in each tune
Brightness in period processed adjusts the monochromatic grayscale to preset gray scale.In the present embodiment, optic modulating device 503,504 and
505 be DMD, including multiple modulation units, i.e. micro mirror unit, these micro mirror units carry out under the control of control device 502
The conversion of "ON" or "OFF" state, i.e., under "On" state, monochromatic brightness is constant, monochromatic bright under "Off" state
Degree is 0, that is to say, that control device 502 is additionally operable to control corresponding micro mirror list in the brightness of each modulation period according to monochromatic light
Member adjusts the monochromatic grayscale to preset gray scale in the switch time of each modulation period.
Below by taking 4 grayscale as an example, ash is realized using grouping modulation of source to projection display system provided by the invention
The principle of rank illustrates.As shown in Figure 6 and Figure 8, equally to realize red grayscale as 10, green grayscale is 12, blue grayscale
For 5.
With the rotation of Wavelength converter, when exciting light is incident on the red fluorescence powder region of Wavelength converter, control
Device 502 processed is modulated red monochromatic light P-R.As shown in the P-R in Fig. 8, a cycle t is divided into the modulation period
T0, t1, t2 and t3.It is open state that control device 502, which controls modulated light source 5010 in modulation period t0, in other modulation
Section is in off state, and the amplitude by controlling the exciting light generated, and modulated light source 5010 is enabled to provide 2 in modulation period t00
The light intensity of=1 unit.It is open state that control device 502, which controls modulated light source 5011 in modulation period t1, t2 and t3,
Other modulation periods are in off state, and modulated light source 5011 is enabled to provide 2 in modulation period t11The light intensity of=2 units；
Period t2 offer 2 is provided2The light intensity of=4 units；2 are provided in modulation period t33The light intensity of=8 units.
That is, in modulation period t0, modulated light source 5010 is opened, and provides 20The light intensity of=1 unit；It is modulating
Period t1, modulated light source 5011 are opened, and provide 21The light intensity of=2 units；In modulation period t2, modulated light source 5011 is opened
It opens, provides 22The light intensity of=4 units；In modulation period t3, modulated light source 5011 is opened, and provides 23The light of=8 units
By force；So that the different modulation periods corresponds to different grayscale.
At the same time, 502 pairs of control device micro mirror unit corresponding with red monochromatic light controls, in Fig. 8
Shown in DMD-R so that micro mirror unit modulation period t0 and t2 be "Off" state, as 0, modulation period t1 and t3 be "ON"
State, as 1, remaining time t4, t5, t6, t7 are that can divide to obtain maximum flip-flop transition the flip-flop transition of micro mirror unit
It is equal as possible with t4, t5, t6, t7.In this way, by the modulation of the micro mirror unit in the modulation of light source and optic modulating device, most
Realize that red monochromatic grayscale is eventually：20*0+21*1+22*0+23* 1=10.
Similarly, as shown in the P-G in Fig. 8, in modulation period t0, modulated light source 5010 is opened, and provides 20=1 unit
Light intensity；In modulation period t1, modulated light source 5011 is opened, and provides 21The light intensity of=2 units；It, can in modulation period t2
Modulated light source 5011 is opened, and provides 22The light intensity of=4 units；In modulation period t3, modulated light source 5011 is opened, and provides 23
The light intensity of=8 units.
At the same time, control device 502 controls corresponding micro mirror unit, as shown in the DMD-G in Fig. 8, enables micro-
Mirror unit modulation period t0 and t1 be "Off" state, as 0, modulation period t2 and t3 be "On" state, as 1, in this way,
It is final to realize that the grayscale of green monochromatic light is by the modulation of light source and the modulation of micro mirror unit：20*0+21*0+22*1+23*1
=12.
Similarly, as shown in the P-B in Fig. 8, in modulation period t0, modulated light source 5010 is opened, and provides 20=1 unit
Light intensity；In modulation period t1, modulated light source 5011 is opened, and provides 21The light intensity of=2 units；It, can in modulation period t2
Modulated light source 5011 is opened, and provides 22The light intensity of=4 units；In modulation period t3, modulated light source 5011 is opened, and provides 23
The light intensity of=8 units.
At the same time, control device 502 controls micro mirror unit, as shown in the DMD-B in Fig. 8, enables micro mirror unit
It is "Off" state in modulation period t1 and t3, is "On" state in modulation period t0 and t2, in this way, passing through light source and micro mirror unit
Modulation, the grayscale of realization is：20*1+21*0+22*1+23* 0=5.
Wherein, the brightness that modulated light source provides can be adjusted by monochromatic amplitude and duration, i.e., by sending out
Exciting light amplitude and duration adjust, and the amplitude of exciting light and duration can be opened by modulated light source itself, light source
The time of the quantity and unlatching that open or close is controlled.
It follows that projection display system provided in this embodiment, is divided at least two groups, and pass through control by modulated light source
It makes the duration of each modulation period, respectively modulate light source transmitting described in the group number and every group that the light source is turned on and off in the period
The amplitude of exciting light controls brightness of the monochromatic light within each modulation period, therefore, to being split modulation period no longer only
Duration depending on each modulation period, that is to say, that the duration that opposite can reduce each modulation period, so as to which week will be modulated
Phase is divided into more modulation periods, to meet the needs of multidigit grayscale is to modulation period number, and then can realize more multidigit
The display of gray scale image.
Also, due to projection display system provided in this embodiment, the duration of modulation period is no longer relied only on to be adjusted
Therefore the segmentation of period processed can provide enough flip-flop transitions to micro mirror unit, also there is no need to by shortening micro mirror unit
Flip-flop transition realize more multidigit grayscale.
Example IV
A kind of projection display system is present embodiments provided, which includes three optic modulating devices, such as Fig. 9
It is shown, including light-source system 801, control device 802 and optic modulating device 803, wherein light-source system 801 includes at least two groups
Light source and Wavelength converter.
Equally, in the present embodiment, control device 802 can be by controlling grouping light source 8010 and 8011, to realize
Different grayscale, i.e., by controlling the duration of each modulation period, the light source is turned on and off in each modulation period group number with
And the amplitude of the exciting light of light source transmitting described in every group, brightness of the monochromatic light within each modulation period is controlled, it is specific to modulate
Process is same as the previously described embodiments, and details are not described herein.
Place unlike the embodiments above is that optic modulating device 803 receives the RGB of the generation of light-source system 801 successively
Three kinds of monochromatic light, and the "ON" or "Off" shape of the micro mirror unit in optic modulating device 803 are controlled by control device 802 successively
This three kinds of monochromatic grayscale are adjusted to preset gray scale, and are projected on screen successively by state successively, pass through human eye
Persistence of vision acts on, the composograph in human brain.Monochromatic grayscale is adjusted to the detailed process of preset gray scale, also with it is above-mentioned
Embodiment is identical, and details are not described herein.
Modulated light source is divided at least two groups by projection display system provided in this embodiment, and by controlling each modulation
The exciting light of light source transmitting described in the duration of period, the group number that the light source is turned on and off in each modulation period and every group
Amplitude controls brightness of the monochromatic light within each modulation period and therefore no longer only depends on to being split modulation period successively
In the duration of each modulation period, that is to say, that the duration that opposite can reduce each modulation period, so as to divide modulation period
More modulation periods are cut into, to meet the needs of multidigit grayscale is to modulation period number, and then can realize more multidigit grayscale
The display of image.
Also, due to projection display system provided in this embodiment, the duration of modulation period is no longer relied only on to be adjusted
Therefore the segmentation of period processed can provide enough flip-flop transitions to micro mirror unit, also there is no need to by shortening micro mirror unit
Flip-flop transition realize more multidigit grayscale.
Embodiment five
A kind of control method of projection display system is present embodiments provided, the throwing that any embodiment as above provides is applied to
Shadow display system, method flow diagram is as shown in Figure 10, including：
S901：The monochromatic period that light-source system generates is divided into multiple modulation periods, the light-source system includes extremely
Few two groups of light sources；
It is turned on and off the time by controlling light source in light-source system, when the monochromatic period is divided into multiple modulation
Section.Brightness needed for modulation period number and each modulation period is obtained according to preset gray scale.Wherein, above-mentioned monochromatic light can
Think red, green or blue monochromatic light.
S902：By controlling the group number that the light source is turned on and off in each modulation period, the monochromatic light is controlled each
Modulate the brightness in the period；
In addition, also brightness of the monochromatic light within each modulation period can be controlled by controlling each duration for modulating the period.
The control of each modulation period duration, can be realized by controlling the opening time of light source.
When light source be can not modulated light source when, can be only turned on and off by controlling the light source in each modulation period
Group number controls brightness of the monochromatic light within each modulation period；Also it can pass through the duration for controlling each modulation period and each tune
The group number that the light source is turned on and off in period processed controls brightness of the monochromatic light within each modulation period.
It, can the duration by controlling each modulation period, institute in each modulation period when the light source is modulated light source
The amplitude for stating the exciting light of light source transmitting described in the group number and every group that light source is turned on and off, controls the monochromatic light in each tune
Brightness in period processed.
S903：According to brightness of the monochromatic light within each modulation period, the monochromatic grayscale is adjusted to default
Grayscale.
The above-mentioned brightness according to the monochromatic light within each modulation period adjusts the monochromatic grayscale to default ash
Rank, specially：
Brightness according to the monochromatic light in each modulation period controls corresponding modulation unit in each switch shape for modulating the period
State adjusts the monochromatic grayscale to preset gray scale.
The monochromatic period that light-source system generates is divided by the control method of projection display system provided in this embodiment
Multiple modulation periods, and the group number being turned on and off by controlling each modulation period inner light source, the monochromatic light is controlled in each tune
Brightness in period processed therefore, there is no need to be split modulation period according still further to the duration of each modulation period, that is to say, that
The duration that opposite can reduce each modulation period is more to meet so as to be divided into more modulation periods modulation period
Position grayscale can realize the display of more multidigit gray scale image to modulating the demand of period number.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (15)
1. a kind of projection display system, which is characterized in that including：
Light-source system, the light-source system include Wavelength converter and at least two groups light source, and the light source is excited for emitting
Light, the Wavelength converter is for absorbing the exciting light and generating at least two monochromatic light；
Control device for the period of the monochromatic light modulation primary lights image to be divided into multiple modulation periods, and passes through control
The group number that the light source is turned on and off in each modulation period, to control brightness of the monochromatic light within each modulation period；
Optic modulating device will be described for receiving the monochromatic light, and the brightness according to the monochromatic light within each modulation period
Monochromatic grayscale is adjusted to preset gray scale.
2. system according to claim 1, which is characterized in that the control device is additionally operable to by controlling each modulation period
Duration, control the monochromatic light it is each modulation the period in brightness.
3. system according to claim 2, which is characterized in that at least two groups light source includes laser light source or LED light
Source.
4. system according to claim 3, which is characterized in that every group of light source includes that the number of light source is identical or different.
5. system according to claim 4, which is characterized in that the light source is modulated light source, same group of the light
The amplitude of the exciting light of source transmitting is identical, and the amplitude of the exciting light of the light source transmitting of difference group is identical or different.
6. system according to claim 5, which is characterized in that when the light source is modulated light source, the control dress
It sets by controlling light described in the group number and every group that the light source is turned on and off in each duration for modulating the period, respectively modulation period
The amplitude of the exciting light of source transmitting controls brightness of the monochromatic light within each modulation period.
7. system according to claim 6, which is characterized in that the optic modulating device includes multiple modulation units, and institute
Control device is stated to be additionally operable to control corresponding modulation unit in each modulation in the brightness of each modulation period according to the monochromatic light
The switch time of section, the monochromatic grayscale is adjusted to preset gray scale.
8. system according to claim 7, which is characterized in that the projection display system includes an optic modulating device,
The optic modulating device receives the monochromatic light, and the brightness according to the monochromatic light in each modulation period successively successively, by institute
Monochromatic grayscale is stated to adjust to preset gray scale.
9. system according to claim 7, which is characterized in that the projection display system includes three optic modulating devices,
Three optic modulating devices receive corresponding monochromatic light respectively, and according to the monochromatic light received in each modulation period
Brightness adjusts the monochromatic grayscale to preset gray scale.
10. system according to claim 8 or claim 9, which is characterized in that the control device is additionally operable to by controlling each modulation
The impulse amplitude of group number or each modulation period inner light source that period inner light source is turned on and off, controls the modulation unit
Reversal rate is less than preset value.
11. system according to claim 10, which is characterized in that the Wavelength converter includes wavelength conversion sheet and drive
There are at least two light-emitting zones, at least one light-emitting zone to be provided with wavelength conversion material for dynamic device, the wavelength conversion sheet,
The driving device is for driving the wavelength conversion sheet to rotate so that different light-emitting zones are sequentially located at the light of the exciting light
On the road.
12. a kind of projection display system control method is applied to claim 1-11 any one of them projection display systems,
It is characterized in that, including：
The period for the monochromatic light modulation primary lights image that light-source system generates is divided into multiple modulation periods, the light-source system packet
Include at least two groups light source；
By controlling the group number that the light source is turned on and off in each modulation period, the monochromatic light is controlled within each modulation period
Brightness；
According to brightness of the monochromatic light within each modulation period, the monochromatic grayscale is adjusted to preset gray scale.
13. according to the method for claim 12, which is characterized in that the control monochromatic light is within each modulation period
The process of brightness further includes：
By controlling the duration of each modulation period, brightness of the monochromatic light within each modulation period is controlled.
14. according to the method for claim 13, which is characterized in that when the light source is modulated light source, described in control
The process of brightness of the monochromatic light within each modulation period include：
By controlling the duration of each modulation period, respectively modulating described in the group number and every group that the light source is turned on and off in the period
The amplitude of the exciting light of light source transmitting controls brightness of the monochromatic light within each modulation period.
15. according to the method for claim 14, which is characterized in that it is described according to the monochromatic light within each modulation period
Brightness adjusts the monochromatic grayscale to preset gray scale, specially：
Brightness according to the monochromatic light in each modulation period controls on off state of the corresponding modulation unit in each modulation period,
Adjusting the monochromatic grayscale to preset gray scale.
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| CN107621746B (en) * | 2016-07-15 | 2019-07-02 | 深圳光峰科技股份有限公司 | Light emitting device and relevant projecting system |
| CN108267916B (en) * | 2016-12-30 | 2020-09-29 | 深圳光峰科技股份有限公司 | Laser light source and display device |
| CN108957924B (en) | 2017-05-24 | 2021-07-23 | 深圳光峰科技股份有限公司 | Laser lighting device and projection system using the same |
| CN109960097B (en) * | 2017-12-22 | 2021-08-31 | 成都理想境界科技有限公司 | Monochromatic laser light source, color laser light source and laser projection equipment |
| CN112019824B (en) * | 2019-05-30 | 2023-04-11 | 深圳光峰科技股份有限公司 | Display device |
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| EP3136169A1 (en) * | 2014-04-23 | 2017-03-01 | Appotronics China Corporation | Light source system, and projection system and method |
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| US7404645B2 (en) * | 2005-06-20 | 2008-07-29 | Digital Display Innovations, Llc | Image and light source modulation for a digital display system |
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| CN102854715A (en) * | 2011-12-25 | 2013-01-02 | 深圳市光峰光电技术有限公司 | Projector and control method thereof |
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