CN108957930A - The white balance adjustment method and laser projection device of laser light source colour mixture color section - Google Patents
The white balance adjustment method and laser projection device of laser light source colour mixture color section Download PDFInfo
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- CN108957930A CN108957930A CN201810983647.9A CN201810983647A CN108957930A CN 108957930 A CN108957930 A CN 108957930A CN 201810983647 A CN201810983647 A CN 201810983647A CN 108957930 A CN108957930 A CN 108957930A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
Abstract
The invention discloses a kind of white balance adjustment methods of laser light source colour mixture color section, obtain the chromaticity coordinates of each colour mixture color section, and target color coordinates, compare the size relation of two groups of chromaticity coordinates, situation whole bigger than normal if it exists or that entirety is less than normal, then it is adjusted by exporting the laser of period to blue primary color light output period or yellow light, so that chromaticity coordinates value becomes smaller or increases on the whole, improve regulated efficiency, if non-above situation, then adjust separately the driving current of the laser of feux rouges corresponding output period or green light corresponding output period, to change the size for individually changing x or y in chromaticity coordinates, so that the adjustment of the two is independent mutually, it will not influence each other, pass through the above-mentioned adjustment to multiple colour mixture color section white balances, it can be realized the adjust automatically of efficient white balance, and it is conducive to the application that colour mixture color section is shown in image, Improve image display brightness.
Description
Technical field
The present invention relates to projection field, in particular to a kind of white balance adjustment method of laser light source colour mixture color section.
Background technique
Laser projection is a kind of projector that projected image is transmitted using laser beam, mainly includes light source die
The components such as group, ray machine mould group.
In the light source module group of laser projection, laser and fluorescent wheel are generally included as Wavelength converter.Swash
Light device can be mono-colour laser, be also possible to two-color laser device, so that the laser of one or two kinds of colors is issued, on fluorescent wheel
It is provided with fluorescent powder, the fluorescence of corresponding color can be inspired, the color of the laser for issuing with laser carries out light mixing
White light is formed, and in the mode for being mixed to form white light, pure red, green, blue three primary colours are not necessarily generated, this is because fluorescence
Wave-length coverage it is wider, especially generate red fluorescence primary lights when, be limited to the fluorescence conversion efficiency of red fluorescence powder, and
It is excited to generate using yellow or tangerine color fluorescent powder, in this way, other colors other than three primary colours will be supervened,
Mixed white light is collectively formed in these colors, and provides illumination to x ray machine part as projection light source.
The white balance of projection light source determines the colour temperature of projected image.Usual colour temperature can indicate by chromaticity coordinates, example
If chromaticity coordinates is that (x, y) indicates that accounting of the feux rouges in white light is x, accounting of the green light in white light is y.
For normal liquid crystal display device, for white balance correction at last based on three primary colours respectively independence
, for example, for chromaticity coordinates (x, y), so the two adjustment is not done mutually when adjustment red or green want the chromaticity coordinates reached
It disturbs.
But for laser projection device, on the one hand according to the above description in light source module group, the production of various colors light
Life reason is different, the laser that existing laser issues, the fluorescence for also having laser excitation wavelength transition material to generate, this light source
Luminescence mechanism but also the light of different base colors be easy for when carrying out brightness change deviate setting proportionate relationship, cause color
The variation of coordinate, causes white balance to change.On the other hand, since light source luminescent mechanism also leads to not using traditional three primary colours
Correcting algorithm.This is because, due to jointly such as blue with other primary lights, green carries out mixing shape by taking yellow fluorescence as an example
At white light, a kind of primary lights are generally also considered to belong to, but exactly, are the light combination color for belonging to primary lights.Wherein yellow light
The inside has contained the component of feux rouges and green light primary lights, and the corresponding relationship of red primaries and green primary is not just in x, y and system
Simple one-to-one relationship, and white balance is still realized using the gain and deviation of conventional correction algorithm adjustment RGB color
When, just it is unable to reach the purpose that one chromaticity coordinates component of adjustment can simply be changed red or green.For example, right
For the monochrome or two-color laser being imaged using red, green, blue, yellow four primary colours are shown, when adjusting red gain, because
Also contribution has red component in chloroaniline coloured light, when adjusting to whole red gain, also results in chloroaniline coloured light Green
The variation of component y, similarly, when adjusting green gain, x can also change.For example, the chromaticity coordinates of original white field be (0.27,
0.29), target will be adjusted to (0.28,0.29), become 0.28 from 0.27 when adjusting red gain and increasing x, at the same y also from
0.29 gets higher, if adjusting green gain reduction makes y to 0.29, while x becomes smaller again and become again.This makes laser excitation light source
Blank level adjustment in type is more difficult.Also, due to being in the prior art mostly to manually adjust, subjective evaluation and test is needed, but right
For colour mixture color section, that is, spoke spoke area, wheel speed rotation is very fast, and human eye can not almost identify that this makes the prior art
Scheme can not also adapt to the blank level adjustment of colour mixture color section.In order to accelerate product progress, usually multiple spoke areas period is utilized
Software approach excision, this can undoubtedly reduce the brightness of entire display cycle, and spoke area quantity is more, and luminance loss is tighter
Weight, and if do not adjusted, it is easy to that colour cast phenomenon occurs.
Summary of the invention
The embodiment of the invention provides the white balance adjustment methods and corresponding laser of a kind of laser light source colour mixture color section
Projection device realizes the adjust automatically of white balance.Used technical solution is as follows:
On the one hand, a kind of white balance adjustment method of laser light source colour mixture color section is provided, which comprises
The position for determining a colour mixture color section in colour wheel rotation in multiple colour mixture color sections, obtains the white balance of current colour mixture color section
Chromaticity coordinates (x, y) and target white balance chromaticity coordinates (x0, y0)；
Current colour mixture color section chromaticity coordinates (x, y) and target white balance chromaticity coordinates (x0, y0) are compared；
If current colour mixture color section chromaticity coordinates is respectively less than or is greater than the colour mixture color section target color coordinates, blue primary color light or Huang are adjusted
The driving current of laser in the light output period, until the chromaticity coordinates of the colour mixture color section and the difference of its target color coordinates are pre-
If in range；
Otherwise, the driving current for adjusting separately feux rouges or the laser of green light corresponding output period, makes the difference of x Yu x0 or y and y0
Value is within a preset range；
It repeats the above process, until the adjustment of all colour mixture color sections finishes.
On the other hand, a kind of laser projection device using above-mentioned white balance adjustment method is provided, it can efficiently certainly
The dynamic adjustment for realizing colour mixture color section white balance.
The technical solution that above embodiment of the present invention provides at least bring it is following the utility model has the advantages that
After determining a colour mixture color fragment position in multiple colour mixture color sections in colour wheel rotation, to a certain colour mixture color section white balance
Self-regulating process in, by obtaining current chromaticity coordinates and being compared with target white balance chromaticity coordinates, sat according to two groups of colors
Feux rouges in mark, the size relation of green light ratio, the situation that entirety is bigger than normal if it exists or entirety is less than normal, then by blue primary color light
The laser of output period or yellow light output period are adjusted, so that (x, y) value in chromaticity coordinates becomes smaller or increases on the whole,
Regulated efficiency is improved, if non-above situation, the feux rouges corresponding output period is adjusted separately or green light corresponds to the output period
The driving current of laser, to change the size for individually changing x or y in chromaticity coordinates, so that the adjustment of the two is independent mutually, no
It can influence each other.By the above-mentioned adjustment to multiple colour mixture color section white balances, the adjust automatically of efficient white balance can be realized,
And it is conducive to the application that colour mixture color section is shown in image, improves image display brightness.
Using the laser projection device of above-mentioned white balance adjustment method, colour mixture color section white balance also can be efficiently realized
Adjust automatically improves image display brightness, enhances product competitiveness.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of schematic diagram of internal structure of laser projection provided in an embodiment of the present invention；
Fig. 2A is a kind of fluorescent wheel structural schematic diagram provided in an embodiment of the present invention；
Fig. 2 B is a kind of filter wheel wheel construction schematic diagram corresponding with Fig. 2A provided in an embodiment of the present invention；
Fig. 3 is a kind of light source timing control schematic diagram provided in an embodiment of the present invention；
Fig. 4 is another light source timing control schematic diagram provided in an embodiment of the present invention；
Fig. 5 is a kind of gamut range schematic diagram provided in an embodiment of the present invention；
Fig. 6 is another gamut range schematic diagram provided in an embodiment of the present invention；
Fig. 7 is chromaticity coordinates variation schematic diagram provided in an embodiment of the present invention；
Fig. 8 A, Fig. 8 B are that the embodiment of the present invention provides colour mixture color section schematic diagram；
Fig. 9 A is that the embodiment of the present invention provides a kind of flow diagram of laser light source colour mixture color section white balance adjustment method；
Fig. 9 B is the flow diagram of a certain colour mixture color section white balance adjustment method provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 is a kind of internal structure module diagram of laser projection 10 provided in an embodiment of the present invention, as shown,
The laser projection 10 may include: light source module group and ray machine mould group, and the two may be collectively referred to as light engine.Light source module group can be with
Including laser, fluorescent wheel and sensor and laser beam shaping optical path (not shown).It is provided on the laser plate
Laser, the laser can be mono-colour laser, be also possible to two-color laser device.The sensor of fluorescent wheel is used for fluorescent wheel
Revolving speed and turned position detected.Ray machine mould group may include digital micro-mirror device (English: Digital
Micromirror Device；Referred to as: DMD) plate, filter wheel and sensor and illumination path (not shown).And filter
The sensor of colour wheel is used to detect the revolving speed of filter wheel and turned position.
Wherein, the laser in light source module group issues laser, and a part of laser can be used as exciting light, excites on fluorescent wheel
Wavelength conversion material shine, issue the fluorescence of corresponding color, a part of laser can be transmitted through transmission area (this root of fluorescent wheel
Depending on the construction and light path design demand of fluorescent wheel) with a kind of primary colours light output.
With the rotation of fluorescent wheel, when fluorescent wheel is excited, the fluorescence spectra of sending is very wide, generally for acquisition
The fluorescence of the color of higher degree or the fluorescence for obtaining a certain range color section in spectrum can also filter by filter wheel.Through
After crossing filter wheel optical filtering, due to two colour wheel synchronous rotaries, continue the primary lights according to sequential export different colours in this way, due to people
The eye persistence of vision, what is experienced is mixed white light.
In practical application, it can also include other structures which uses as laser projection tv, such as aobvious
Show plate, for sending display signal, television set (English: television to DMD；Referred to as: TV) TV plate, for video input
Signal stream parsed, Wireless Fidelity (English: WIreless-FIdelity, referred to as: WIFI) plate for be wirelessly connected pipe
Reason and driving plate are used to carry out the electrical parts such as laser, fan driving power supply etc., and the embodiment of the present invention does not go to live in the household of one's in-laws on getting married to this
It states.
As shown in Figure 2 A, a kind of fluorescent wheel structural schematic diagram provided in an embodiment of the present invention is applied to laser projection device,
When laser light source is monochromatic laser light source, green emitting phosphor region shown in the diagram region G, diagram are provided in fluorescent wheel circumferential direction
Yellow fluorescent powder region shown in the region Y, and blue laser transmission region shown in diagram B area.Fig. 2 B shows this reality
A kind of colour filter wheel construction for applying example offer, accordingly, on filter wheel is provided with blue primary color transmitance region B, green light color filter regions G,
Yellow light color filter regions or transmission area Y, and in order to which red fluorescence is obtained by filtration from yellow fluorescence, corresponding fluorescent wheel yellow fluorescence
Exit area is also provided with red color filter area R, and the red color filter area and yellow color filter regions or transmission area Y on such filter wheel are in color
The sum of shared center of circle angle is identical as center of circle angle shared by yellow fluorescent powder region Y on fluorescent wheel on wheel.
By taking laser is blue laser as an example, when light source module group carries out primary colours light output, timing control such as Fig. 3 institute
Show.Wherein, R_EN, G_EN, B_EN are respectively feux rouges, green light, the enable signal of blue primary color light, the color in expression system
Light effectively exports.
From the figure 3, it may be seen that blue laser is persistently lighted during entire timing, but according to the enabled of different base colors light
Signal exports the light of different colours in system.When G_EN is high level, R_EN and B_EN are low level, i.e., green light is enabled, this
When for blue laser excite fluorescent wheel on green emitting phosphor, issue green fluorescence, the green primary light as in white light.When
B_EN is high level, and R_EN and G_EN are low level, i.e., blue primary color light is enabled, and the laser that blue laser issues at this time is logical
Cross the B laser transmission region on fluorescent wheel, the blue primary color light as in white light.When R_EN is high level, B_EN and G_EN are equal
For low level, i.e. feux rouges is enabled, the yellow fluorescent powder Y on the fluorescent wheel of blue laser excitation at this time, and by filter wheel
Feux rouges color filter regions export feux rouges, the red primaries light as in white light.And when R_EN and G_EN is high level, B_EN is low electricity
Usually, the yellow fluorescent powder Y on the fluorescent wheel of blue laser excitation at this time, and by the yellow color filter regions of filter wheel or transmission area
Y exports yellow fluorescence, the chloroaniline coloured light as in white light.It will also realize that by above-mentioned timing control process, when system exports yellow light
When, control is actually combined by the clock signal of green light and feux rouges, this is also and point in yellow light containing green light and feux rouges
Amount is correspondingly.
Similarly, even if laser is two-color laser device, for example blue laser and red laser are issued, at this time red primaries light
It is generated by red laser, and the yellow fluorescent powder on fluorescent wheel is still excited to issue yellow fluorescence, when again passing by filter wheel
When, yellow color filter regions or transmission area Y can be only set on filter wheel according to optics needs, and red color filter area is no longer set
R, such system white light are mixed to form by blue laser, red laser, green fluorescence, yellow fluorescence.It is of course also possible in colour filter
It is also provided with red color filter area simultaneously on wheel, such system white light is by blue laser, red laser, fraction red fluorescence, portion
Divide yellow fluorescence, green fluorescence mixing composition.
The timing control process schematic of above-mentioned two-color laser light source as shown in figure 4, with above-mentioned monochromatic laser light source when
Sequence figure the difference is that, when R_EN is that high level feux rouges is enabled, red laser is lighted, and blue laser is not lighted.And work as
When system exports yellow light, R_EN is high level, but red laser is not lighted at this time, but is still blue laser point
It is bright, and G_EN is cooperated to be high level, i.e. when R_EN and G_EN are simultaneously high level, the enabled output of yellow light.
And in conjunction with Fig. 3, timing control figure shown in Fig. 4, due to output blue primary lights in light-source system, feux rouges is green
Light, yellow light have the timing period independent, and therefore, in control, the light of each color also has corresponding driving
Current signal.
The luminous process of laser projection and working principle are briefly described above, will be said based on this below
The adjustment process of bright laser light source white balance.
In the prior art, when white balance changes, the offset of colour temperature usually occurs, color temperature value is usually using chromaticity coordinates table
Show, and then chromaticity coordinates also changes.Usual opponent-color coordinates adjust to target value the consistency that white balance can be realized.
As shown in figure 5, each primary coordinate in light source why indicated at a gamut range, such as lines different in figure three
Angular domain range, the center position of gamut range have the point an of white balance, point A as shown in Figure 5.
It is shape of a hoof range in colour gamut floor map as shown in FIG. 6, three regions part as shown in the figure is red,
It is green, it is blue, wherein green fields are located at the top left region of horseshoe-shaped diagram, and closer to the edges of regions, green color is purer, together
Reason, blue are located at lower left corner region, and closer to lower left corner region, Blue is purer, and red is located at lower right field, closer to
Lower right area, red color are purer.Any when chromaticity coordinates, which is located at, to shift in the gamut map, deviated towards partial region, then
It will lead to whole white balance color and be biased to the color.
The colour temperature adjustment of white light can be matched together by red, green, blue color base coloured light to be obtained, the corresponding chromaticity coordinates one of colour temperature
As indicated using (x, y), x indicates ratio of the feux rouges in white light, and y indicates ratio of the green light in white light, and (1-x-y) is indicated
Ratio of the blue primary color light in white light.Red, green, the ratio of blue primary color light are by adjusting corresponding driving current value
It obtains.When light coloured using fluorescent wheel excitation band, fluorescent wheel is rotation, and the light of different colours is that timesharing is projected
's.Driving current is pulse width modulating technology (English: Pulse Width Modulation；Referred to as: PWM) electric current.
Colour mixture color section is usually signified spoke spoke area, refers to the boundary transition region of two kinds of colors, is a range,
Within usual area's several years.The quantity of colour mixture color section is related with the quantity of primary colours color section in light source.
As shown in Figure 8 A, since beam and focus has certain size, when light beam passes through the different subregions of colour wheel, hot spot
It gradually can be transitioned into another color subregion from a color subregion, cause the color of colour mixture color section with the face of adjacent sectors
Color.
Blue in this example, use is red, green, Huang Si kind color forms white light, then has as shown in Figure 8 B four mixed
Color color section, the bluish-green colour mixture section of respectively h1, the greenish-yellow colour mixture section of h2, the yellow red colour mixture section of h3, the red blue colour mixture section of h4, each colour mixture section
With respective chromaticity coordinates.
In usual implement, in order to enable colour mixture color section can be normally utilized, the chromaticity coordinates to simple primary lights into
After row adjustment, further the chromaticity coordinates of colour mixture color section is adjusted.
The embodiment of the present invention is based on above specification provides a kind of white balance adjustment methods of laser light source colour mixture color section, such as
Flow diagram shown in Fig. 9 A, this method comprises:
Step S11: it determines the position of a colour mixture color section in colour wheel rotation in multiple colour mixture color sections, obtains current colour mixture color
The white balance chromaticity coordinates (x, y) and target white balance chromaticity coordinates (x0, y0) of section；
In laser excitation light source, fluorescence is by colour wheel, i.e., fluorescent wheel is excited to generate, in order to monitor fluorescent wheel revolving speed and
Position usually marks in color wheel motor or colour wheel periphery non-irradiated region setting mark, by the label, records a certain color
Beginning, and can learn correspondence at a distance from the starting color (pass through how many center of circle angle) according to other colors on colour wheel
Other colors starting position.
And when sensor detect mark mark, indicate that a certain color starts, then system export test pattern, specifically
When detecting that a certain spoke area colour mixture color section starts, system shows corresponding test pattern.The test of each colour mixture color section
Graph card can be different.
When system shows test pattern, the chromaticity coordinates of detection current system output image, i.e., the color of current colour mixture color section
Coordinate.It should be noted that since colour mixture color section is the process of a gradual change, i.e., formed there are two types of color mixing, it therefore, can be with
A certain position is set as its chromaticity coordinates normal place, multiple positions can also be chosen, measure multiple chromaticity coordinates, and obtain by operation
Chromaticity coordinates value after obtaining a weighting.
Step S13: current colour mixture color section chromaticity coordinates (x, y) and target white balance chromaticity coordinates (x0, y0) are compared；
Specifically, it is respectively compared the size of feux rouges ratio and green light ratio.
Step S15: if current colour mixture color section chromaticity coordinates is respectively less than or is greater than the colour mixture color section target color coordinates, step is executed
Rapid S17:
Adjust blue primary color light or yellow light output the period in laser driving current, until the colour mixture color section chromaticity coordinates with
The difference of its target color coordinates is within a preset range；
Otherwise, to step S19: adjust separately the driving current of the laser of feux rouges or green light corresponding output period, make x and x0 or
The difference of y and y0 is within a preset range；
And repeat the above process, until the adjustment of all colour mixture color sections finishes.
It below will be specifically to be illustrated for one of colour mixture color section, such as the turquoise colour mixture color section of h1, certainly
Other colour mixture color sections can be chosen, method of adjustment is consistent.It is specific as follows:
Step 10: obtaining white balance chromaticity coordinates (x, y) and target color coordinates (x0, y0).
Specifically, laser projection device receive instruction, show test pattern, and to the chromaticity coordinates of the graph card currently shown into
Row detection, obtains current white balance chromaticity coordinates (x, y), and wherein x is ratio of the feux rouges in white light, and y is green light in white light
Ratio.
Step 20: current chromaticity coordinates (x, y) and target white balance chromaticity coordinates (x0, y0) are compared；
Step 40: if each coordinate value of current chromaticity coordinates (x, y) be respectively less than it is corresponding in target white balance chromaticity coordinates (x0, y0)
Coordinate value thens follow the steps 60: the driving current of the laser of adjustment blue primary color light corresponding output period, until x and x0 or y
Within a preset range with the difference of y0；
Or step 41: if each coordinate value of current chromaticity coordinates (x, y) be all larger than it is right in target white balance chromaticity coordinates (x0, y0)
The coordinate value answered thens follow the steps S61: the driving current of the laser of adjustment yellow light corresponding output period, until x and x0 or y
Within a preset range with the difference of y0;
If not above-mentioned two situations then follow the steps 80: adjusting separately the drive of feux rouges or the laser of green light corresponding output period
Streaming current makes the difference of x and x0 or y and y0 within a preset range.
Specifically in step 40, if each coordinate value of current chromaticity coordinates (x, y) is respectively less than target white balance chromaticity coordinates value
Corresponding coordinate value, i.e. x < x0 in (x0, y0), y < y0 then adjust the driving of the laser of blue primary color light corresponding output period
Electric current specifically includes: reducing the driving current of the laser of blue primary color light corresponding output period, until x's and x0 or y and y0
Difference is within a preset range.
In specific implementation, difference preset range can be specifically | x-x0 | ￡ 0.005, | y-y0 | ￡ 0.005.
This is because gamut map according to figure 6, the chromaticity coordinates value close to blue primary color light region is close to X-axis, Y-axis
Initial position, the x in chromaticity coordinates value, y is smaller, as x < x0, y < y0, illustrates that chromaticity coordinates is partially blue, then in light source output control
When processed, reducing the driving current of Fig. 3 or the blue laser of blue primary color light output period shown in Fig. 4 such as specifically can
Reduce the value of the driving current to be the duty ratio of adjustment PWM wave, so that the brightness of blue primary color light is reduced, but also blue
Brightness ratio decline of the color base coloured light in integrated light source mixed light, moves up, i.e. x to the right so that chromaticity coordinates is whole,
Y is towards the direction change increased.As shown in fig. 7, chromaticity coordinates point is mobile from A point to B point.
In this example, based on the timing control figure of Fig. 3, light source type is monochromatic laser light source, and laser is indigo plant
Illustrate for color laser.In embodiments of the present invention, the corresponding driving current value of the light of a certain color be light source module group in,
Driving current value of the laser in the period for the light for generating a certain color.The corresponding driving current value of feux rouges is light source module group
In, blue laser is in the period (that is to say, blue primary color light is radiated at the period in yellow fluorescent powder region) for generating the feux rouges
Driving current value；The corresponding driving current value of green light be light source module group in, blue laser generate the green light period (
Be that blue primary color light is radiated at the period in green emitting phosphor region) driving current value；The corresponding driving electricity of blue primary color light
Flow valuve is in light source module group, and blue laser (that is to say, blue primary color light is radiated at glimmering in the period for generating the blue primary color light
The period of halo transmission area) driving current value.
It can be step-type subtract when the driving current Db of the blue laser to the blue primary color light output period changes
It is small, after adjustment and the chromaticity coordinates value of current graph card is detected every time, calculates the difference variation of x and x0, y and y0.Repeat above-mentioned stepping
Formula adjusts process, it should be noted that although each coordinate value of current chromaticity coordinates (x, y) is respectively less than mesh in this kind of situation
Corresponding coordinate value in white balance chromaticity coordinates (x0, y0) is marked, but the difference of two groups of coordinate values may be not identical, therefore, two
Group difference is lesser can meet in difference range simultaneously, therefore in concrete operations, can determine whether x and x0 and y with
The difference of two groups of coordinate values of y0 first meets one group in preset range, stops driving the laser of current color light output period
The adjustment of electric current；To another group of coordinate value for not meeting preset range, the laser of corresponding color output period is individually adjusted
Driving current, until meeting preset range.
Specifically, for example x and this group of coordinate value of x0 first meet above-mentioned difference preset range, i.e. y and this group of coordinate value of y0
Difference be greater than difference between x and x0, then stop the driving current Db to the blue laser of blue primary color light output period
Reduction adjustment.
Next, adjusting the driving of the blue laser of green light output period in light-source system further according to the difference of y and y0
Electric current Dg.For example, needing for y to be gradually increased, then finely tunes and increase driving current Dg, so that green light ratio increases, each step-by-step movement
After adjusting current value, then the chromaticity coordinates of read test graph card, by above-mentioned repetitive process, until increasing to y value meets difference
The numerical value of preset range.
And in step 41, if each coordinate value of current chromaticity coordinates (x, y) is all larger than target white balance chromaticity coordinates
Corresponding coordinate value, i.e. x > x0 in (x0, y0), y > y0 then adjust the driving current of the laser of yellow light corresponding output period, tool
Body includes: the driving current for reducing the laser of yellow light corresponding output period, until the difference of x and x0 or y and y0 is in default model
In enclosing.
Similarly, this is because gamut map according to figure 6, x, y are all larger than target color coordinates value, illustrate that color is close
Red gamut regions and Green region are needed x, and the value of y reduces, and chromaticity coordinates point is mobile to Blue color domain region.Cause
This reduces the driving such as Fig. 3 or the blue laser of yellow color light output period shown in Fig. 4 in light source output control
Electric current Dy specifically can be the duty ratio of adjustment PWM wave to reduce the value of the driving current, to reduce yellow color
The brightness of light includes feux rouges and green component inside yellow light, by the adjustment to yellow light brightness, also just simultaneously to feux rouges and green
Light component is adjusted, and is improved the efficiency of chromaticity coordinates adjustment, can be reached target value faster.
When yellow light brightness reduces, the component of green light and feux rouges is reduced in light source overall output, thus chromaticity coordinates point to
Blue region is close, similarly can refer to Fig. 7, can simply be interpreted as, mobile from B point to A point.In this way, chromaticity coordinates x, y, which is directed towards, to be leaned on
The direction of nearly coordinate origin is mobile, and numerical value becomes smaller, and has reached adjustment chromaticity coordinates x, the purpose that y reduces.
It can be step-type reduction when the driving current Dy of the blue laser to the yellow light output period changes, and real
When detect the chromaticity coordinates value of current graph card, calculate the difference variation of x and x0, y and y0.It is similarly such as above-mentioned, judge x and x0 and y
First meet one group in preset range with the difference of two groups of coordinate values of y0, stops driving the laser of current color light output period
The adjustment of streaming current；To another group of coordinate value for not meeting preset range, the laser of corresponding color output period is individually adjusted
Driving current, until meet preset range.For example by adjusting detection, y and y0 are close almost consistent, meet above-mentioned difference
Preset range then stops the reduction of the driving current Dy of the blue laser to the yellow light output period.
Next, adjusting the driving of the blue laser of feux rouges output period in light-source system further according to the gap of x and x0
Electric current Dr is then finely tuned for example, needing to reduce x and is reduced driving current Dr, so that feux rouges ratio reduces, by reading survey repeatedly
The chromaticity coordinates for attempting card makes x value be reduced to the numerical value for meeting difference preset range.
It should be noted that being also greater than target white balance chromaticity coordinates judging that current chromaticity coordinates (x, y) is integrally less than
When being worth corresponding coordinate value in (x0, y0), the sequencing of judgement is not distinguished.
And also sequence, Fig. 8 only provide a kind of specific example in no particular order for above-mentioned judgment step 40 and step 41.
And if current chromaticity coordinates (x, y) and x and x0 in target white balance chromaticity coordinates value (x0, y0), the size of y and y0
Above-mentioned steps 40 are not belonging to, the situation being integrally less than or greater than in step 41 then has following scenario described:
X<x0, y>y0 or x>x0, y<y0 then need the driving for adjusting separately feux rouges or the laser of green light corresponding output period
Electric current, until x and x0 or y and y0 difference within a preset range.
In oneainstance, the laser projection light source with multiple bases includes: blue laser primary lights, green fluorescence primary colours
Light, yellow fluorescence primary lights, red fluorescence primary lights；Wherein, the laser of feux rouges or green light corresponding output period is adjusted separately
Driving current, specifically include the difference of x and x0 or y and y0 within a preset range:
The driving current for adjusting separately red fluorescence or the blue laser laser of green fluorescence corresponding output period, makes x and x0
Or the difference of y and y0 is within a preset range.
This is the situation that projection light source is monochromatic laser light source, and only blue laser, all primary lights pass through blue
Laser directly issues, or excitation fluorescent wheel generates.
In a kind of situation, the laser projection light source with multiple bases includes: blue laser primary lights, red laser primary colours
Light, green fluorescence primary lights, yellow fluorescence primary lights, wherein described to adjust separately swashing for feux rouges or green light corresponding output period
The driving current of light device specifically includes the difference of x and x0 or y and y0 within a preset range:
When the driving current or green fluorescence for adjusting separately the red laser of red laser corresponding output period correspond to output
The driving current of the blue laser of section makes the difference of x and x0 or y and y0 within a preset range.
That is, when laser projection light source is two-color laser light source, including blue laser and two kinds of red laser, when
When being individually adjusted to feux rouges ratio x, then the driving current of red laser is directly adjusted.Such as by increasing red laser
The driving current of device can make x increase, and reduce the driving current of red laser, can x be reduced.
Specifically, if x<x0, y>y0 then needs to increase x value, and y value reduces, then needs to export feux rouges in light-source system
The driving current Dr of blue laser increases in period, so that the output brightness of feux rouges increases, the ratio in white light increases,
In gamut map shown in fig. 6, chromaticity coordinates can be mobile towards the direction of red gamut range, so that x value becomes larger.And by by light source
The driving current Dg of blue laser reduces in the green light output period in system, so that the output brightness of green light reduces, in white light
In ratio reduce, the direction that chromaticity coordinates is directed away from Green range is mobile, so that y value becomes smaller.
Similarly, work as x>x0, when y<y0, adjust the driving current Dr of blue laser in the feux rouges output period in light-source system
Reduce, the driving current Dg that green light exports blue laser in the period increases, so that x reduces, y increases, until to connect
Close-target value reaches in the difference preset range with target value.
And further, after the adjust automatically for completing above-mentioned chromaticity coordinates, chromaticity coordinates (x, y) adjusted is recorded
The driving current value of corresponding laser, and drive corresponding laser according to this, i.e., the adjustment is called in equipment running process
The corresponding laser drive current value of chromaticity coordinates afterwards, drives laser.
In the method for adjustment of above-mentioned white balance, no matter the projection light source of mono-colour laser or the projection of two-color laser device
Light source is applicable.
The adjustment process for completing the white balance to one of colour mixture color section above, by repeating the above steps 40 ~ 80,
It can complete the adjustment to all colour mixture color sections.
And further, after the adjust automatically for completing above-mentioned chromaticity coordinates, each colour mixture color section adjusted is recorded
The corresponding laser of chromaticity coordinates driving current value, and call corresponding numerical value in each colour mixture color section, that is, pass through monitoring
Colour wheel turned position, when showing single primary colours using the adjustment of front portion after the corresponding laser of chromaticity coordinates driving current
Value, when reaching a certain colour mixture color section, then calls the driving of the corresponding laser of chromaticity coordinates after the corresponding adjustment of colour mixture color section
Current value, when there are when primary colours color, then at least there are the colour mixture color sections several again of 4 colour mixture color sections or 4 in light source, this and color
The revolving speed of wheel and the multiple proportion of display frequency are related, and each colour mixture color section calls the driving current of corresponding laser
Value can support swashing in each colour mixture color section because laser can reach the switching frequency of ten a few to tens of K completely
The switching of light device driving current.
To sum up, the above embodiment of the present invention provides a kind of automatic white balance adjustment method of laser light source colour mixture color section,
During the adjustment to white balance, by sending default graph card to laser projection display device, the color for detecting default picture is sat
Mark, and be compared with target color coordinates, according to x, y feux rouges, the size relation of green light ratio, by right in two groups of chromaticity coordinates
The driving current that the laser of period should be exported is changed, to change the size of x or y in chromaticity coordinates, so that the tune of the two
Whole mutual independence, will not influence each other.And work as x, y need it is whole when becoming larger or becoming smaller, then by non-red primaries light and
The non-sharp coloured light of blue exports the period, i.e. the laser of blue primary color light output period or yellow light output period is adjusted, so that
(x, y) value in chromaticity coordinates becomes smaller or increases on the whole, improves regulated efficiency, does not need manually to debug, and makes multiple mixed
Color color section can be utilized, and promote the overall brightness of light source.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of white balance adjustment method of laser light source colour mixture color section, applied to the laser projection light source with multiple bases,
It is characterized in that, which comprises
The position for determining a colour mixture color section in colour wheel rotation in multiple colour mixture color sections, obtains the white balance of current colour mixture color section
Chromaticity coordinates (x, y) and target white balance chromaticity coordinates (x0, y0)；
Current colour mixture color section chromaticity coordinates (x, y) and target white balance chromaticity coordinates (x0, y0) are compared；
If current colour mixture color section chromaticity coordinates is respectively less than or is greater than the colour mixture color section target color coordinates, blue primary color light or Huang are adjusted
The driving current of laser in the light output period, until the chromaticity coordinates of the colour mixture color section and the difference of its target color coordinates are pre-
If in range；
Otherwise, the driving current for adjusting separately feux rouges or the laser of green light corresponding output period, makes the difference of x Yu x0 or y and y0
Value is within a preset range；
It repeats the above process, until the adjustment of all colour mixture color sections finishes.
2. according to method of adjustment described in power 1, which is characterized in that be somebody's turn to do if the current colour mixture color section chromaticity coordinates is respectively less than or is greater than
Colour mixture color section target color coordinates then adjust the driving current of blue primary color light or the laser of yellow light output period, until this is mixed
The chromaticity coordinates of color color section specifically includes within a preset range with the difference of its target color coordinates:
If each coordinate value of current colour mixture color section chromaticity coordinates (x, y) is respectively less than in target white balance chromaticity coordinates (x0, y0) corresponding
Coordinate value, then the driving current of the laser of blue primary color light output period is adjusted, until the difference of x and x0 or y and y0 exist
In preset range；
If each coordinate value of current colour mixture color section chromaticity coordinates (x, y) is all larger than in target white balance chromaticity coordinates (x0, y0) corresponding
Coordinate value, then the driving current of the laser of yellow light corresponding output period is adjusted, until the difference of x and x0 or y and y0 is pre-
If in range.
3. according to method of adjustment described in power 2, which is characterized in that if each seat of the current colour mixture color section chromaticity coordinates (x, y)
Scale value is respectively less than corresponding coordinate value in target white balance chromaticity coordinates (x0, y0), then adjusts swashing for blue primary color light output period
The driving current of light device, specifically includes:
Reduce the driving current of the laser of blue primary color light corresponding output period；
And/or
If each coordinate value of the current colour mixture color section chromaticity coordinates (x, y) is all larger than in target white balance chromaticity coordinates (x0, y0)
Corresponding coordinate value then adjusts the driving current of the laser of yellow light corresponding output period, specifically includes:
Reduce the driving current of the laser of yellow light corresponding output period.
4. according to any method of adjustment of power 1 ~ 2, which is characterized in that described until the difference of x and x0 or y and y0 is default
It is specifically included in range:
Judge that the difference of x and x0 and y and two groups of coordinate values of y0 first meets one group in preset range,
Stop the adjustment to the laser drive current of current color light output period；
To another group of coordinate value for not meeting preset range, the driving electricity of the laser of corresponding color output period is individually adjusted
Stream, until meeting preset range.
5. according to method of adjustment described in power 1, which is characterized in that the laser projection light source with multiple bases includes: blue
Laser primary lights, green fluorescence primary lights, yellow fluorescence primary lights, red fluorescence primary lights；Wherein, described to adjust separately feux rouges
Or the driving current of the laser of green light corresponding output period, wrap the difference of x and x0 or y and y0 specifically within a preset range
It includes:
The driving current for adjusting separately red fluorescence or the blue laser laser of green fluorescence corresponding output period, makes x and x0
Or the difference of y and y0 is within a preset range.
6. according to method of adjustment described in power 1, which is characterized in that the laser projection light source with multiple bases includes: blue
Laser primary lights, red laser primary lights, green fluorescence primary lights, yellow fluorescence primary lights, wherein described to adjust separately feux rouges
Or the driving current of the laser of green light corresponding output period, wrap the difference of x and x0 or y and y0 specifically within a preset range
It includes:
When the driving current or green fluorescence for adjusting separately the red laser of red laser corresponding output period correspond to output
The driving current of the blue laser of section makes the difference of x and x0 or y and y0 within a preset range.
7. any method according to claim 1 ~ 6, which is characterized in that record each colour mixture color section chromaticity coordinates adjusted
The driving current value of (x, y) corresponding laser, and corresponding numerical value is called in each colour mixture color section.
8. any method according to claim 1 ~ 6, which is characterized in that the multiple colour mixture color section and the multiple bases
Type is at multiple proportion.
9. any method according to claim 1, which is characterized in that the difference preset range can be | x-x0 | ￡
0.005, or | y-y0 | ￡ 0.005.
10. a kind of laser projection device, including laser projection light source, using any white balance of the claims 1 ~ 9
Method of adjustment.
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| CN108957931A (en) | 2018-12-07 |
| CN108957931B (en) | 2020-11-03 |
| CN108957930B (en) | 2020-10-09 |
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