CN106292148B - A kind of method and projection arrangement of adjustment color - Google Patents
A kind of method and projection arrangement of adjustment color Download PDFInfo
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- CN106292148B CN106292148B CN201610871558.6A CN201610871558A CN106292148B CN 106292148 B CN106292148 B CN 106292148B CN 201610871558 A CN201610871558 A CN 201610871558A CN 106292148 B CN106292148 B CN 106292148B
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000003086 colorant Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 38
- 230000007306 turnover Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 235000019557 luminance Nutrition 0.000 description 35
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
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- 238000012986 modification Methods 0.000 description 1
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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
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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
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
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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
- G03B21/2053—Intensity control of illuminating light
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Optics & Photonics (AREA)
- Signal Processing (AREA)
- Projection Apparatus (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
The present invention provides the method and projection arrangement of adjustment color, and method includes：Determine that the first object projection brightness of the first color in multiple colors that the picture currently to be projected needs, the first color region of fluorescent powder color wheel define multiple first color sections；Determine the first practical projection brightness of current first color；Judge whether the difference between the first practical projection brightness and first object projection brightness is located in the first preset range；Dystopy of being on duty is when in the first preset range, using the first practical projection brightness as the first color projection brightness；When difference is not located in the first preset range, judge whether the first parameter reaches the first maximum limit value；The step of when the first parameter is not up to the first maximum limit value, adjusting the first parameter, returning to the first practical projection brightness for determining current first color；According to the projection brightness of other color regions on the first color projection brightness adjustment fluorescent powder color wheel, to reach white balance.
Description
Technical Field
The present invention relates to the field of projection apparatuses, and in particular, to a method for adjusting color and a projection apparatus.
Background
When the projector projects an image by using the phosphor color wheel, the projector may cause inconsistent reflection degree due to uneven distribution of the phosphor, thereby causing color abnormality of the projected image. In addition, the non-linear reflection brightness of the light source on the phosphor wheel can cause color anomalies in the projected image. In addition, the light source may also cause color anomalies in the projected image as it ages. Therefore, it is necessary to provide a method for adjusting color so that when the color of the projected image is abnormal, the color of the projected image can be adjusted to be guaranteed.
Disclosure of Invention
The invention aims to provide a method for adjusting color and a projection device, which can adjust to ensure the color of a projected image when the color of the projected image is abnormal.
In order to achieve the above object, in a first aspect, the present invention provides a method for adjusting color for a projection apparatus, the projection apparatus comprising a light source, a phosphor wheel and a digital micro-mirror device, the phosphor wheel being divided into a plurality of color regions, at least one of the color regions defining a plurality of color sections, the method for adjusting color comprising:
determining a first target projection brightness of a first color in a plurality of colors required by a picture to be projected currently, wherein a plurality of first color sections are defined in a first color area of the fluorescent powder color wheel;
determining a first actual projection brightness of the current first color;
judging whether the difference between the first actual projection brightness and the first target projection brightness is within a first preset range;
when the difference is within the first preset range, taking the first actual projection brightness as first color projection brightness;
when the difference is not within the first preset range, judging whether the first parameter reaches a first maximum limit value;
when the first parameter does not reach the first maximum limit value, adjusting the first parameter, and returning to the step of determining the first actual projection brightness of the current first color;
and adjusting the projection brightness of other color areas on the fluorescent powder color wheel according to the first color projection brightness so as to achieve white balance.
Preferably, the first parameter is the time for the digital micromirror device to flip, and the first maximum limit value is a first maximum color segment of the first color region; or, the first parameter is a first output brightness when the light emitted by the light source is projected to the first color region, and the first maximum limit value is a maximum output brightness of the light source.
Preferably, the method further comprises: when the first parameter reaches the first maximum limit value, judging whether a second parameter reaches a second maximum limit value;
when the second parameter reaches the second maximum limit value, the first actual projection brightness determined according to the first maximum limit value and the second maximum limit value is used as the first color projection brightness;
when the second parameter does not reach the second maximum limit value, adjusting the second parameter, and re-determining the first actual projection brightness of the current first color;
judging whether the difference between the redetermined first actual projection brightness and the first target projection brightness is within the first preset range or not;
when the difference is within the first preset range, the redetermined first actual projection brightness is used as the first color projection brightness;
and returning to the step of judging whether the second parameter reaches the second maximum limit value of the second parameter when the difference is not within the first preset range.
Preferably, the first parameter is the time for turning the dmd, the first maximum limit value is a first maximum color section of the first color region, the second parameter is a first output brightness when the light emitted from the light source is projected to the first color region, and the second maximum limit value is a maximum output brightness of the light source; or, the first parameter is a first output brightness when the light emitted by the light source is projected to the first color region, and the first maximum limit value is a maximum output brightness of the light source; the second parameter is the time for the digital micromirror device to flip, and the second maximum limit value is a first maximum color segment of the first color zone.
Preferably, the step of determining the first actual projection brightness of the current first color comprises: directly detecting the reflected brightness of the plurality of first color sections after reflection, and determining the first actual projection brightness according to the emission brightness of the plurality of first color sections; or,
according to the formulaCalculating the first actual projection brightness, wherein y represents the first actual projection brightness, i represents the ith first color segment of the first color segments of the first color region where the time for the digital micromirror device to turn over passes, a represents the first output brightness when the light emitted by the light source is projected to the first color region, and t represents the second output brightness when the light emitted by the light source is projected to the second color regioni(a) Representing a rootThe reflection brightness of the ith first color segment obtained according to the preset information, p represents the time of the digital micro-mirror device turning in the first color region, and m represents the maximum number of at least one first color segment of the first color region passed by the time of the digital micro-mirror device turning.
Preferably, the step of adjusting the projection brightness of the other color regions on the phosphor color wheel according to the first color projection brightness comprises: and adjusting the turning time of the digital micro-mirror device and/or the output brightness of other color areas projected to the fluorescent powder color wheel by the light emitted by the light source according to the first color projection brightness so as to adjust the projection brightness of other colors.
In a second aspect, the present invention provides a projection apparatus, comprising a light source, a phosphor wheel and a digital micromirror device, wherein the phosphor wheel is divided into a plurality of color regions, and at least one of the color regions defines a plurality of color segments;
the projection device further comprises a processing unit for:
determining a first target projection brightness of a first color in a plurality of colors required by a picture to be projected currently, wherein a plurality of first color sections are defined in a first color area of the fluorescent powder color wheel;
determining a first actual projection brightness of the current first color;
judging whether the difference between the first actual projection brightness and the first target projection brightness is within a first preset range;
when the difference is within the first preset range, taking the first actual projection brightness as first color projection brightness;
when the difference is not within the first preset range, judging whether the first parameter reaches a first maximum limit value;
when the first parameter does not reach the first maximum limit value, adjusting the first parameter, and determining the first actual projection brightness of the current first color according to the first parameter;
and adjusting the projection brightness of other color areas on the fluorescent powder color wheel according to the first color projection brightness so as to achieve white balance.
Preferably, the processing unit is further configured to:
when the first parameter reaches the first maximum limit value, judging whether a second parameter reaches a second maximum limit value;
when the second parameter reaches the second maximum limit value, the first actual projection brightness determined according to the first maximum limit value and the second maximum limit value is used as the first color projection brightness; when the second parameter does not reach the second maximum limit value, adjusting the second parameter, and re-determining the first actual projection brightness of the current first color according to the second parameter;
judging whether the difference between the redetermined first actual projection brightness and the first target projection brightness is within the first preset range or not;
when the difference is within the first preset range, the redetermined first actual projection brightness is used as the first color projection brightness; when the difference is not within the first preset range, whether the second parameter reaches the second maximum limit value of the second parameter is judged again.
Preferably, the first parameter is the time for turning the dmd, the first maximum limit value is a first maximum color section of the first color region, the second parameter is a first output brightness when the light emitted from the light source is projected to the first color region, and the second maximum limit value is a maximum output brightness of the light source; or, the first parameter is a first output brightness when the light emitted by the light source is projected to the first color region, and the first maximum limit value is a maximum output brightness of the light source; the second parameter is the time for the digital micromirror device to flip, and the second maximum limit value is a first maximum color segment of the first color zone.
Preferably, the projection apparatus further comprises: the detection unit is arranged behind the fluorescent powder color wheel and used for detecting the reflection brightness of the plurality of color sections, and the processing unit is also used for determining the first actual projection brightness according to the reflection brightness of the plurality of first color sections directly detected by the detection unit after reflection; or,
the processing unit is used for calculating the formulaCalculating the first actual projection brightness, wherein y represents the first actual projection brightness, i represents the ith first color segment of the first color segments of the first color region where the time for the digital micromirror device to turn over passes, a represents the first output brightness when the light emitted by the light source is projected to the first color region, and t represents the second output brightness when the light emitted by the light source is projected to the second color regioni(a) The reflection brightness of the ith first color segment obtained according to the preset information is represented, p represents the time of the digital micro-mirror device in the first color region, and m represents the maximum number of at least one first color segment of the first color region after the time of the digital micro-mirror device in the first color region.
Preferably, the processing unit adjusts the turning time of the dmd and/or the output brightness of other color regions projected by the light emitted from the light source onto the phosphor wheel according to the first color projection brightness to adjust the projection brightness of the other colors.
Compared with the prior art, according to the method for adjusting colors and the projection device provided by the invention, when the difference between the first actual projection brightness of the first color and the first target projection brightness is detected to be outside the first preset range, the actual projection brightness of the first color in the multiple colors is adjusted by using the first parameter and the second parameter to obtain the first color projection brightness, so that the actual projection brightness is close to the target projection brightness of the color, and then, the projection brightness of other colors is adjusted according to the first color projection brightness to achieve white balance, so that the adjustment can be carried out to ensure the color of the projected image when the color of the projected image is abnormal.
Drawings
Fig. 1 is a schematic structural diagram of a projection apparatus according to an embodiment of the present invention;
fig. 2A and fig. 2B are schematic diagrams of a phosphor color wheel according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method for adjusting color according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating another method for adjusting color according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating another method for adjusting color according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating a further method for adjusting color according to an embodiment of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Fig. 1 is a schematic structural diagram of a projection apparatus according to an embodiment of the present invention. As shown in fig. 1, the projection apparatus 100 includes: a light source 10, a phosphor color wheel 11, a Digital Micromirror Device (DMD) 12, and a processing unit 13. The light source 10, the phosphor wheel 11 and the digital micromirror device 12 are coupled to the processing unit 13.
The phosphor wheel 11 is divided into a plurality of color regions, and a plurality of color segments are defined on at least one of the plurality of color regions. The phosphor color wheel 11 may be a three-color phosphor color wheel, a four-color phosphor color wheel, or a six-color phosphor color wheel, for example, the phosphor color wheel 11 is a three-color phosphor color wheel, that is, the phosphor color wheel 11 is divided into three color regions, and a plurality of color sections are defined on each of the three color regions. Fig. 2A and fig. 2B are schematic diagrams of a phosphor color wheel according to an embodiment of the present invention. As shown in fig. 2A, the three-color phosphor color wheel includes an a color region, a B color region, and a C color region. As shown in fig. 2B, a plurality of color segments, a1 and a2 … An, are defined on the color a region; a plurality of color sections, namely B1 and B2 … Bn, are positioned on the B color area; the color C area defines a plurality of color sections, which are respectively C1 and C2 … Cn.
Fig. 3 is a flowchart illustrating a method for adjusting color according to an embodiment of the present invention. The method for adjusting color shown in fig. 3 is applied to the projection apparatus 100, and the method for adjusting color includes:
step S01, determining a first target projection brightness of a first color of the plurality of colors required by the current picture to be projected. For example, assuming that the first color is red, it is determined that a picture to be projected is to be presented, and the required projection brightness of red is the first target projection brightness of the first color. The first color region of the phosphor color wheel 11 defines a plurality of first color segments, for example, the a color region defines a plurality of a color segments a1, a2 … An.
And step S02, determining the first actual projection brightness of the current first color.
Step S03, determining whether the difference between the first actual projection brightness and the first target projection brightness is within a first preset range.
And step S04, when the difference is within the first preset range, taking the first actual projection brightness as the first color projection brightness. Thereafter, the process proceeds to step S13.
Step S05, when the difference is not within the first predetermined range (i.e. when the difference is outside the first predetermined range), it is determined whether the first parameter reaches the first maximum limit value.
Step S06, when the first parameter does not reach the first maximum limit value, the first parameter is adjusted, and the process returns to step S102.
Step S13, adjusting the projection brightness of the other color areas on the phosphor color wheel 11 according to the projection brightness of the first color to achieve white balance.
It should be noted that, the first parameter may be a time for the digital micromirror device to flip, and the first maximum limit value may be a first maximum color section of the first color region; alternatively, the first parameter may be a first output brightness when the light emitted by the light source is projected to the first color region, and the first maximum defined value may be a maximum output brightness of the light source.
Fig. 4 is a flowchart illustrating another method for adjusting color according to an embodiment of the present invention. The method for adjusting color shown in fig. 4 is applied to the projection apparatus 100, and the method for adjusting color includes:
step S101, determining a first target projection brightness of a first color in a plurality of colors required by a picture to be projected currently. For example, assuming that the first color is red, it is determined that a picture to be projected is to be presented, and the required projection brightness of red is the first target projection brightness of the first color. The first color region of the phosphor color wheel 11 defines a plurality of first color segments, for example, the a color region defines a plurality of a color segments a1, a2 … An.
And step S102, determining the first actual projection brightness of the current first color.
Step S103, determining whether the difference between the first actual projection brightness and the first target projection brightness is within a first preset range.
And step S104, when the difference is within a first preset range, taking the first actual projection brightness as the first color projection brightness. Thereafter, the process proceeds to step S113.
Step S105, when the difference is not within the first predetermined range (i.e. when the difference is outside the first predetermined range), determining whether the first parameter reaches the first maximum limit value.
And S106, when the first parameter does not reach the first maximum limit value, adjusting the first parameter, and returning to the step S102.
Step S107, when the first parameter reaches the first maximum limit value, judging whether the second parameter reaches the second maximum limit value.
And S108, when the second parameter reaches a second maximum limit value, taking the first actual projection brightness determined according to the first maximum limit value and the second maximum limit value as the first color projection brightness. Thereafter, the process proceeds to step S113.
And step S109, when the second parameter does not reach the second maximum limit value, adjusting the second parameter, and re-determining the first actual projection brightness of the current first color.
Step S110, determining whether the difference between the redetermined first actual projection brightness and the first target projection brightness is within a first preset range. When the difference is not within the first preset range, the process returns to step S107.
And step S111, when the difference is within a first preset range, taking the redetermined first actual projection brightness as first color projection brightness. Thereafter, the process proceeds to step S113.
Step S113, adjusting the projection brightness of other color areas on the phosphor color wheel 11 according to the first color projection brightness to achieve white balance.
Preferably, step S113 may include: the time of the DMD12 flipping and/or the output brightness of the other color regions projected by the light source 10 onto the phosphor color wheel 11 are adjusted according to the first color projected brightness to adjust the projected brightness of the other colors, so as to achieve the white balance. For example, for the phosphor color wheel shown in fig. 2, assuming that the projection brightness of the color a is adjusted first, in step S113, the actual projection brightness of the color B, C may be adjusted to the projection brightness of the color a in the same manner as the color a, so as to maintain the brightness of each color at 1:1:1, thereby achieving white balance, and the adjustment method for the color B, C is the same as the adjustment method for the color a, and the embodiment of the present invention is not repeated herein.
In determining the first actual projection brightness of the first color, the following formula may be utilized: where y represents a first actual projection luminance, i represents an ith first color segment of the first color segments of the first color region where the time for the DMD12 to flip passes, a represents a first output luminance when the light emitted from the light source 10 is projected to the first color region, and t represents a second actual projection luminancei(a) Represents the reflection brightness of the ith first color segment obtained according to the preset information, p represents the time for DMD12 to flip over the first color region, and m represents the number of at least one first color segment of the first color region that the time for DMD12 to flip over passes. Illustratively, the first color is a color, the first output brightness is L1, and the DMD12 flips over time p1 from a2 to a4 of the a color region, so that the 1 st a color segment is a2, the 3 rd a color segment is a4, and the reflection brightness of a2 is t1(L1) the reflection luminance of A3 was t2(L1) the reflection luminance of A4 was t3(L1), actual projected luminance of A color When the time for turning the DMD12 is adjusted to p2, the passing a color region is a2-a6, the 1 a color segment is a2, the 5 th a color segment is a6, and the reflection brightness of a2 is t1(L1) the reflection luminance of A3 was t2(L1), …, A6 has a reflection luminance of t5(L1), actual projected luminance of A color The first color may be an a color, a B color, or a C color.
The method for adjusting color may further include: when the light source 10 emits a plurality of output luminances, the reflected luminances of a plurality of color segments corresponding to a plurality of color regions respectively are detected and stored to obtain preset information, as shown in fig. 1, the projection apparatus 100 may further include: the detecting unit 14 and the storing unit 15 are coupled to the processing unit 13, the detecting unit 14 is disposed behind the phosphor color wheel 11 for detecting the reflection brightness of the plurality of color segments corresponding to the plurality of color areas when the light source 10 outputs different output brightness to obtain the predetermined information, and the storing unit is used for storing the predetermined information. Taking the phosphor color wheel 11 as a three-color phosphor color wheel as An example, when the output brightness of the light emitted by the light source 10 projected to the a color region is L1, the reflected brightness of the color segments a1 and a2 … An is detected, when the output brightness of the light emitted by the light source 10 projected to the a color region is L2, the reflected brightness of the color segments a1 and a2 … An is detected, …, when the output brightness of the light emitted by the light source 10 projected to the a color region is Lx, the reflected brightness of the color segments a1 and a2 … An is detected; detecting the reflection brightness of the color segments B1 and B2 … Bn when the output brightness of the light emitted by the light source 10 projected to the color B region is L1, detecting the reflection brightness of the color segments B1 and B2 … Bn when the output brightness of the light emitted by the light source 10 projected to the color B region is L2, …, and detecting the reflection brightness of the color segments B1 and B2 … Bn when the output brightness of the light emitted by the light source 10 projected to the color B region is Lx; detecting the reflection brightness of the color segments C1 and C2 … Cn when the output brightness of the light emitted by the light source 10 projected to the C color region is L1, detecting the reflection brightness of the color segments C1 and C2 … Cn when the output brightness of the light emitted by the light source 10 projected to the C color region is L2, …, and detecting the reflection brightness of the color segments C1 and C2 … Cn when the output brightness of the light emitted by the light source 10 projected to the C color region is Lx; finally, the corresponding relation between the obtained reflection brightness, the output brightness and the color area is stored to obtain the preset information. Specifically, the preset information may be a two-dimensional table, and table 1 shows the reflection luminances of a plurality of segments for different output luminances of the light source 10, for example, when the output luminance is L1, the reflection luminance of the a1 color segment is O11, when the output luminance is L2, the reflection luminance of the a1 color segment is O21, when the output luminance is L1, the reflection luminance of the B1 color segment is P11, and when the output luminance is L2, the reflection luminance of the B1 color segment is P21.
TABLE 1
In another embodiment of the present invention, when the processing unit 13 of the projection apparatus 100 determines the first actual projection brightness of the first color, the detecting unit 14 may be directly utilized to directly detect the reflected brightness of the plurality of first color segments after reflection, so as to determine the first actual projection brightness.
Fig. 5 is a flowchart illustrating another method for adjusting color according to an embodiment of the present invention. As shown in fig. 5, the method for adjusting color is applied to the projection apparatus 100, specifically, the first parameter may be a time for the DMD12 to flip, the first maximum limit value may be a first maximum color section of the first color region, the second parameter may be a first output brightness when the light emitted from the light source 10 is projected to the first color region, and the second maximum limit value may be a maximum output brightness of the light source 10, as shown in fig. 5, the method for adjusting color may include:
step S201, determining a first target projection brightness of a first color of a plurality of colors required by a current picture to be projected. For example, assuming that the first color is green, it is determined that a picture to be projected is to be presented, and the required projection brightness of the green is the first target projection brightness of the first color. The first color region of the phosphor color wheel 11 defines a plurality of first color segments, for example, the B color region defines a plurality of B color segments B1, B2 … Bn.
Step S202, determining a first actual projection brightness of the current first color.
Step S203, determine whether the difference between the first actual projection brightness and the first target projection brightness is within a first preset range.
And step S204, when the difference is within a first preset range, taking the first actual projection brightness as the first color projection brightness. Then, the process goes to step S213.
In step S205, when the difference is not within the first preset range, it is determined whether the time for turning the DMD12 reaches the first maximum color section of the first color region. The first maximum color section refers to all sections of the first color, for example, the first color is a color, the first maximum color section is a1 to An, the first color is B color, and the first maximum color section is B1 to Bn.
In step S206, when the time does not reach the first maximum color zone, the time for DMD12 to flip is adjusted, and the process returns to step S202. Specifically, the time to flip DMD12 is increased when the time does not reach the first maximum color segment.
Step S207, when the time reaches the first maximum color zone, determining whether the first output brightness when the light emitted from the light source 10 is projected to the first color zone reaches the maximum output brightness of the light source 10.
Step S208, when the first output luminance reaches the maximum output luminance, the first actual projection luminance determined according to the time for DMD12 to flip reaching the first maximum color section and the maximum output luminance is taken as the first color projection luminance. Then, the process goes to step S213.
Step S209, when the first output brightness does not reach the maximum output brightness, adjusting the first output brightness projected by the light emitted from the light source 10 to the first color region, and re-determining the first actual projection brightness of the current first color. Specifically, when the first output brightness does not reach the maximum output brightness, the first output brightness of the first color region projected by the light emitted from the light source 10 is increased.
Step S210, determining whether the difference between the redetermined first actual projection brightness and the first target projection brightness is within a first preset range. When the difference is not within the first preset range, the process returns to step S207.
And step S211, when the difference is within a first preset range, taking the redetermined first actual projection brightness as the first color projection brightness. Then, the process goes to step S213.
Step S213, adjusting the projection brightness of other color areas on the phosphor color wheel 11 according to the projection brightness of the first color to achieve white balance.
For example, assume that the target projection brightness of color a is 500, the actual projection brightness is 450, and the preset range is 10; firstly, judging whether the DMD12 passes through all A color sections of the A color area when being in an on state, if not, increasing the time that the DMD12 is in the on state to enable the actual projection brightness to be close to the target brightness 500 (namely, the difference between the actual projection brightness and the target brightness is within a preset range); when the DMD12 passes through all the color sections a when in the on state, and the difference between the actual projection luminance and the target projection luminance 500 is still no longer within the preset range, the output luminance projected to the color area a by the light source 10 is continuously adjusted to make the actual projection luminance approach the target luminance 500; when the output brightness of the light source 10 is adjusted to make the actual projection brightness 491 (the difference is within the preset range), the actual projection brightness 491 is used as the projection brightness of the color A, and the actual projection brightness of the colors B and C is also adjusted to 491 in the same way as the color A, so that the brightness of each color is maintained at 1:1:1, and the white balance is achieved; assuming that the output brightness of the light source 10 is the maximum output brightness, the actual projection brightness is 480 (the difference is no longer within the preset range), the actual projection brightness 480 is used as the projection brightness of the color a, and the actual projection brightness of the colors B and C is also adjusted to 480 in the same way as the color a, so as to maintain the brightness of each color at 1:1:1, thereby achieving the white balance.
Fig. 6 is a flowchart illustrating a further method for adjusting color according to an embodiment of the present invention. Specifically, in another embodiment of the present invention, the first parameter may be a first output brightness of the light emitted from the light source 10 projected to the first color region, and the first maximum limit value may be a maximum output brightness of the light source 10; the second parameter may be the time for DMD12 to flip, and the second maximum limit may be the first maximum color segment of the first color region, as shown in fig. 6, and the method of adjusting the color may include:
step S301, determining a first target projection brightness of a first color of a plurality of colors required by a current picture to be projected.
Step S302, determining a first actual projection brightness of the current first color.
Step S303, determining whether the difference between the first actual projection brightness and the first target projection brightness is within a first preset range.
And step S304, when the difference is within a first preset range, taking the first actual projection brightness as the first color projection brightness. Then, the process goes to step S313.
Step S305, when the difference is not within the first preset range, determining whether the first output brightness when the light emitted from the light source 10 is projected to the first color region reaches the maximum output brightness of the light source 10.
Step S306, when the first output brightness does not reach the maximum output brightness, adjusting the first output brightness, and returning to the step S302.
Step S307, when the first output luminance reaches the maximum output luminance, it is determined whether the time for the DMD12 to flip reaches the first maximum color section of the first color region.
Step S308, when the time reaches the first maximum color section, the first actual projection luminance determined according to the time at which the DMD12 reaching the first maximum color section is flipped and the maximum output luminance is taken as the first color projection luminance. Then, the process goes to step S313.
Step S309, when the time does not reach the first maximum color section, adjusting the time for turning the DMD12, and re-determining the first actual projection brightness of the current first color.
Step S310, determining whether the difference between the redetermined first actual projection brightness and the first target projection brightness is within a first preset range. When the difference is not within the first preset range, the process returns to step S307.
And step 311, when the difference is within a first preset range, taking the redetermined first actual projection brightness as the first color projection brightness. Then, the process goes to step S313.
Step S313, the projection brightness of other color areas on the phosphor color wheel 11 is adjusted according to the first color projection brightness to achieve white balance.
The processing unit 13 is configured to perform the above steps S101-S113, S201-S213 or S301-S313.
According to the method for adjusting colors and the projection device provided by the embodiment of the invention, when it is detected that the difference between the first actual projection brightness and the first target projection brightness of the first color is out of the first preset range, the actual projection brightness of the first color in the plurality of colors is adjusted by using the first parameter and the second parameter (specifically, the time of DMD turnover and the output brightness of the light source) to obtain the first color projection brightness, so that the actual projection brightness is close to the target projection brightness of the color, and then, the projection brightness of other colors is adjusted according to the first color projection brightness to achieve white balance, so that the adjustment can be performed to ensure the color of the projected image when the color of the projected image is abnormal.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (11)
1. A method for adjusting color for a projection apparatus, the projection apparatus comprising a light source, a phosphor wheel and a digital micromirror device, the phosphor wheel being divided into a plurality of color regions, wherein at least one of the plurality of color regions is defined with a plurality of color segments, the method comprising:
determining a first target projection brightness of a first color in a plurality of colors required by a picture to be projected currently, wherein a plurality of first color sections are defined in a first color area of the fluorescent powder color wheel;
determining a first actual projection brightness of the current first color;
judging whether the difference between the first actual projection brightness and the first target projection brightness is within a first preset range;
when the difference is within the first preset range, taking the first actual projection brightness as first color projection brightness;
when the difference is not within the first preset range, judging whether the first parameter reaches a first maximum limit value;
when the first parameter does not reach the first maximum limit value, adjusting the first parameter, and returning to the step of determining the first actual projection brightness of the current first color;
and adjusting the projection brightness of other color areas on the fluorescent powder color wheel according to the first color projection brightness so as to achieve white balance.
2. The method according to claim 1, wherein the first parameter is a time for the dmd to flip, and the first maximum limit value is a first maximum color segment of the first color region; or, the first parameter is a first output brightness when the light emitted by the light source is projected to the first color region, and the first maximum limit value is a maximum output brightness of the light source.
3. The method of adjusting color according to claim 1, further comprising:
when the first parameter reaches the first maximum limit value, judging whether a second parameter reaches a second maximum limit value;
when the second parameter reaches the second maximum limit value, the first actual projection brightness determined according to the first maximum limit value and the second maximum limit value is used as the first color projection brightness;
when the second parameter does not reach the second maximum limit value, adjusting the second parameter, and re-determining the first actual projection brightness of the current first color;
judging whether the difference between the redetermined first actual projection brightness and the first target projection brightness is within the first preset range or not;
when the difference is within the first preset range, the redetermined first actual projection brightness is used as the first color projection brightness;
and returning to the step of judging whether the second parameter reaches a second maximum limit value or not when the difference is not within the first preset range.
4. The method according to claim 3, wherein the first parameter is a time for the DMD to flip, the first maximum limit is a first maximum color segment of the first color region, the second parameter is a first output brightness of the light source when the light is projected to the first color region, and the second maximum limit is a maximum output brightness of the light source; or, the first parameter is a first output brightness when the light emitted by the light source is projected to the first color region, the first maximum limit value is a maximum output brightness of the light source, the second parameter is a time for the digital micromirror device to turn over, and the second maximum limit value is a first maximum color section of the first color region.
5. The method of claim 1, wherein the step of determining the first actual projection brightness of the current first color comprises: directly detecting the reflected brightness of the plurality of first color segments after reflection, and determining the first actual projection brightness according to the reflected brightness of the plurality of first color segments; or,
according to the formulaCalculating the first actual projection brightness, wherein y represents the first actual projection brightness, and i represents the ith first color region in the first color segments of the first color region where the time for the digital micromirror device to turn over passesSegment a represents a first output brightness when the light emitted by the light source is projected to the first color region, ti(a) The reflection brightness of the ith first color segment obtained according to the preset information is represented, p represents the time of the digital micro-mirror device in the first color region, and m represents the maximum number of at least one first color segment of the first color region after the time of the digital micro-mirror device in the first color region.
6. The method of claim 1, wherein the step of adjusting the projection brightness of the other color region on the phosphor color wheel according to the projection brightness of the first color comprises: and adjusting the turning time of the digital micro-mirror device and/or the output brightness of other color areas projected to the fluorescent powder color wheel by the light emitted by the light source according to the first color projection brightness so as to adjust the projection brightness of other colors.
7. A projection device comprises a light source, a fluorescent powder color wheel and a digital micro-mirror device, wherein the fluorescent powder color wheel is divided into a plurality of color areas,
defining a plurality of color sections on at least one color area of the plurality of color areas;
the projection device further comprises a processing unit for:
determining a first target projection brightness of a first color in a plurality of colors required by a picture to be projected currently, wherein a plurality of first color sections are defined in a first color area of the fluorescent powder color wheel;
determining a first actual projection brightness of the current first color;
judging whether the difference between the first actual projection brightness and the first target projection brightness is within a first preset range;
when the difference is within the first preset range, taking the first actual projection brightness as first color projection brightness;
when the difference is not within the first preset range, judging whether the first parameter reaches a first maximum limit value;
when the first parameter does not reach the first maximum limit value, adjusting the first parameter, and determining the first actual projection brightness of the current first color according to the first parameter;
and adjusting the projection brightness of other color areas on the fluorescent powder color wheel according to the first color projection brightness so as to achieve white balance.
8. The projection device of claim 7, wherein the processing unit is further configured to:
when the first parameter reaches the first maximum limit value, judging whether a second parameter reaches a second maximum limit value;
when the second parameter reaches the second maximum limit value, the first actual projection brightness determined according to the first maximum limit value and the second maximum limit value is used as the first color projection brightness; when the second parameter does not reach the second maximum limit value, adjusting the second parameter, and re-determining the first actual projection brightness of the current first color according to the second parameter;
judging whether the difference between the redetermined first actual projection brightness and the first target projection brightness is within the first preset range or not;
when the difference is within the first preset range, the redetermined first actual projection brightness is used as the first color projection brightness; when the difference is not within the first preset range, whether the second parameter reaches the second maximum limit value of the second parameter is judged again.
9. The projection apparatus according to claim 8, wherein the first parameter is a time for the dmd to flip, the first maximum limit value is a first maximum color segment of the first color region, the second parameter is a first output brightness when the light emitted from the light source is projected to the first color region, and the second maximum limit value is a maximum output brightness of the light source; or, the first parameter is a first output brightness when the light emitted by the light source is projected to the first color region, and the first maximum limit value is a maximum output brightness of the light source; the second parameter is the time for the digital micromirror device to flip, and the second maximum limit value is a first maximum color segment of the first color zone.
10. The projection apparatus according to claim 7,
the projection device further comprises: the detection unit is arranged behind the fluorescent powder color wheel and used for detecting the reflection brightness of the plurality of color sections, and the processing unit is also used for determining the first actual projection brightness according to the emission brightness of the plurality of first color sections directly detected by the detection unit after reflection; or,
the processing unit is used for calculating the formulaCalculating the first actual projection brightness, wherein y represents the first actual projection brightness, i represents the ith first color segment of the first color segments of the first color region where the time for the digital micro-mirror device to turn over passes, a represents the first output brightness when the light emitted by the light source is projected to the first color region, and t represents the second output brightness when the light emitted by the light source is projected to the second color regioni(a) The reflection brightness of the ith first color segment obtained according to the preset information is represented, p represents the time of the digital micro-mirror device in the first color region, and m represents the maximum number of at least one first color segment of the first color region after the time of the digital micro-mirror device in the first color region.
11. The projection apparatus according to claim 7, wherein the processing unit adjusts the turning time of the dmd and/or the output brightness of other color regions projected by the light source onto the phosphor wheel according to the projection brightness of the first color to adjust the projection brightness of the other colors.
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| US15/719,580 US10379433B2 (en) | 2016-09-30 | 2017-09-29 | Projector and related method for projecting a light beam |
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