CN111458966A - Laser projection device and control method thereof - Google Patents
Laser projection device and control method thereof Download PDFInfo
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- CN111458966A CN111458966A CN201910053542.8A CN201910053542A CN111458966A CN 111458966 A CN111458966 A CN 111458966A CN 201910053542 A CN201910053542 A CN 201910053542A CN 111458966 A CN111458966 A CN 111458966A
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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
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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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Abstract
The invention provides a laser projection device and a control method thereof, wherein the device comprises a laser light source, a laser light source and a control unit, wherein the laser light source is configured to generate exciting light; a wavelength conversion device configured to wavelength-convert the excitation light to generate stimulated light; a color filtering device configured to filter the received laser light; an adjustment device configured to adjust the color filter device to selectively achieve a color filtering effect of the color filter device. According to the laser projection device and the control method thereof provided by the invention, the laser light source and the wavelength conversion device are used for generating the exciting light and the received laser light to generate three primary colors, the adjusting device is used for adjusting the color filtering device to selectively realize the color filtering function of the color filtering device, and further, the state switching of the color filtering device for filtering and not filtering the received laser light is realized, so that the switching between the high color gamut mode and the high brightness mode of the laser projection device is realized.
Description
Technical Field
The invention relates to the field of optics, in particular to a laser projection device and a control method thereof.
Background
In the field of white light realization, the white light is currently synthesized by exciting a fluorescent substance with high-power blue light L ED or blue light L D to obtain a combination of green and red luminescence, and the white light is a scheme for realizing white light, which is gradually paid attention to by researchers in the industry due to its simplicity and low price.
In the current laser projection display product, most of laser light source systems adopt a laser excitation phosphor light-emitting mode to realize the illumination of the projection system, and the specific realization mode is as follows: the light source system mainly obtains time sequence light output through the fluorescent wheel and the light path structure thereof to obtain white light, obtains blue light by utilizing a blank subarea on the fluorescent wheel, and combines the blue light with other green and red light excited on the disk body to form the white light for the projection system to use.
However, the current fluorescent wheel cannot generate three primary colors with good colors, so that the laser light needs to be filtered, but when the laser light is filtered, the brightness and the color gamut of the projection display cannot be obviously adjusted, so that the projection display product cannot simultaneously meet the requirements of high brightness and high color gamut.
Therefore, a new laser projection apparatus and a control method thereof are needed to solve the above problems.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
The present invention provides a laser projection apparatus, comprising:
a laser light source configured to generate excitation light;
a wavelength conversion device configured to wavelength-convert the excitation light to generate stimulated light;
a color filtering device configured to filter the received laser light;
an adjustment device configured to adjust the color filter device to selectively achieve a color filtering effect of the color filter device.
Further, the excitation light includes blue laser, violet laser, or ultraviolet laser.
Further, the wavelength conversion device comprises at least two wavelength conversion subareas to generate a first excited light and a second excited light, and at least one blank subarea to enable the excited light to pass through the wavelength conversion device.
Further, the color filter means includes at least one color filter partition to filter the first excited light and/or the second excited light, and at least one transmissive partition to allow the excited light and/or the excited light to pass through the color filter means without filtering.
Further, the adjusting means includes divisional area positioning means of the color filter means for positioning a specified divisional area during stop of movement of the color filter means, and the positioning of the specified divisional area is canceled before start of movement of the color filter means.
Further, the adjustment device includes a displacement device of the color filter device configured to switch the color filter device between a first specified position and a second specified position.
Further, the first designated position means that the color filter means is not located or partially located within the optical path range of the excitation light and the received light, achieving a high brightness effect; the second appointed position is that the color filter device is located in the light path range of the exciting light and the stimulated light, and high color gamut effect is achieved.
The invention also provides a control method of the laser projection device, which comprises the following steps:
the laser light source generates exciting light;
the wavelength conversion device is used for carrying out wavelength conversion on the exciting light to generate stimulated light;
when the laser projection device is switched to a high color gamut mode, the adjusting device adjusts a color filtering device to enable the color filtering device to filter the received laser light or part of the received laser light;
when the laser projection device is switched to a high-brightness mode, the adjusting device adjusts the color filtering device to enable the color filtering device not to filter the received laser light.
Further, when the laser projection device is switched to a high brightness mode, the color filter device stops moving, and the adjusting device adjusts the position of the designated subarea of the color filter device so that the excitation light and the stimulated light pass through the transmission subarea of the color filter device; when the laser projection device is switched to a high color gamut mode, the adjusting device cancels the adjustment of the position of the specified subarea of the color filter device, and the color filter device starts to move to enable the color filter device to filter the laser receiving light or part of the laser receiving light.
Further, when the laser projection device is switched to a high-brightness mode, the color filter device stops moving, the adjusting device adjusts the color filter device to a first appointed position, and the first appointed position means that the color filter device is not located or partially located in the optical path range of the excitation light and the stimulated light, so that a high-brightness effect is achieved; when the laser projection device is switched to the high color gamut mode, the adjusting device adjusts the color filter device to a second appointed position, the second appointed position is appointed to enable the color filter device to be located in the range of the light paths of the exciting light and the received laser light, the high color gamut effect is achieved, and the color filter device starts to move.
Further, when the laser projection device is switched from the high color gamut mode to the high brightness mode or from the high brightness mode to the high color gamut mode, the driving current of each period of the exciting light is adjusted.
Further, when the laser projection device is switched from the high color gamut mode to the high brightness mode or from the high brightness mode to the high color gamut mode, the laser projection device outputs a dark picture.
According to the laser projection device and the control method thereof provided by the invention, the laser light source and the wavelength conversion device are used for generating the exciting light and the received laser light to generate three primary colors, the adjusting device is used for adjusting the color filtering device to selectively realize the color filtering function of the color filtering device, and further, the state switching of the color filtering device for filtering and not filtering the received laser light is realized, so that the switching between the high color gamut mode and the high brightness mode of the laser projection device is realized.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail embodiments of the present invention with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings, like reference numbers generally represent like parts or steps.
In the drawings:
fig. 1 shows a schematic structural diagram of a laser projection apparatus according to an exemplary embodiment of the present invention.
Fig. 2A shows a front view of a wavelength conversion device according to an exemplary embodiment of the present invention.
Fig. 2B illustrates a right side view of a wavelength conversion device according to an exemplary embodiment of the present invention.
Fig. 3A illustrates a front view of a color filtering apparatus according to an exemplary embodiment of the present invention.
Fig. 3B illustrates a right side view of a color filtering apparatus according to an exemplary embodiment of the present invention.
FIG. 4A shows a right side view of a locating post-locating hole combination in accordance with an exemplary embodiment of the present invention.
FIG. 4B shows a front view of a positioning post-positioning hole combination according to an exemplary embodiment of the present invention.
Fig. 5A shows a schematic view of a color filter arrangement according to an exemplary embodiment of the present invention in the optical path range of the excitation light and the stimulated light.
Fig. 5B shows a schematic view of a color filter arrangement according to an exemplary embodiment of the present invention outside the optical path range of the excitation light and the stimulated light.
Fig. 6 shows a driving current timing chart of excitation light at the time of the high luminance mode and the high color gamut mode according to an exemplary embodiment of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals refer to like elements throughout.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In order to provide a thorough understanding of the present invention, detailed steps and detailed structures will be set forth in the following description in order to explain the present invention. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
In the prior art, a fluorescent wheel cannot generate three primary colors with good colors, so that the laser light is required to be filtered, but when the laser light is filtered, the brightness and the color gamut of projection display cannot be obviously adjusted, so that the projection display product cannot meet the requirements of high brightness and high color gamut at the same time.
In view of the above problem, the present invention provides a new laser projection apparatus, including:
a laser light source configured to generate excitation light;
a wavelength conversion device configured to wavelength-convert the excitation light to generate stimulated light;
a color filtering device configured to filter the received laser light;
an adjustment device configured to adjust the color filter device to selectively achieve a color filtering effect of the color filter device.
The laser projection apparatus of the present invention will be described in detail with reference to fig. 1 to 5B.
Referring to fig. 1, a laser light source 101 of the present invention is configured to generate excitation light 201. For example, the laser light source 101 may be a narrow-band light source, or may be a light source including a plurality of narrow bands.
As an example, the laser source 101 is a narrow-band light source emitted from a specific laser source device, and a 445nm/30W laser source from Nissan corporation is currently used in many cases, but other laser sources may be used. The excitation light 201 may be blue laser, violet laser, ultraviolet laser, or the like, but is not limited thereto, and the excitation light may be any color, and the excitation light 201 is blue laser as an example.
Referring to fig. 1, the laser projection apparatus of the present invention further includes a dichroic element 104, and the dichroic element 104 is configured to achieve transmission of the excitation light 201 and reflection of the stimulated light, and optionally, the dichroic element 104 may also be configured to achieve reflection of the excitation light 201 and transmission of the stimulated light.
For example, the dichroic element 104 is a beam splitter coated with a selective transmission film, or a polarization beam splitter, or other optical elements capable of achieving the above purpose, which will not be described herein again. As an example, the dichroic element coated with a selective transmission film is arranged at an angle of 45 ° with respect to the excitation light 201, for example, the dichroic element is inclined at 45 ° with respect to the horizontal plane, and transmits the excitation light of the short wavelength band and reflects the stimulated light of the long wavelength band.
Referring to fig. 1, the laser projection apparatus of the present invention further includes a light path guiding unit configured to adjust a path of the excitation light 201 so that the excitation light 201 and the received laser light are combined and emitted.
As an example, the optical path guiding unit includes a first reflecting mirror 1061, a second reflecting mirror 1062, and a third reflecting mirror 1063, which are sequentially disposed, as shown in fig. 1, such that the excitation light 201 transmitted through the dichroic element 104 and emitted via the blank partition of the wavelength conversion device 105 is sequentially reflected by the first reflecting mirror 1061, the second reflecting mirror 1062, and the third reflecting mirror 1063 and then transmitted through the dichroic element 104 again, and at this time, the direction thereof coincides with the direction of the stimulated light reflected by the dichroic element 104, so as to realize the emission of the combined light of the excitation light 201 and the stimulated light.
The laser projection device of the present invention further comprises a wavelength conversion device 105 configured to perform wavelength conversion on the excitation light 201 to generate stimulated light.
Referring to fig. 2A and 2B, the wavelength conversion device 105 includes a rotary substrate and a driving element for driving the substrate to rotate, and the substrate is a circular wheel structure or a barrel structure.
Referring to fig. 2A, the base body is provided as a rotatable wheel-type structure, wherein the wheel-type device includes a circular plate-shaped structure. Further, the present application is applicable to a barrel structure other than a circular plate structure, and other shapes that can realize the above-described wavelength conversion function are also applicable to the present application, and are not limited to this example. As an example, the substrate is a metal base material formed of copper, aluminum, or the like, and the surface of the substrate on the excitation light irradiation device side is mirror-finished by silver vapor deposition or the like so that the received laser light is reflected out of the wavelength conversion device 105.
Referring to fig. 2B, the wavelength conversion device further includes a driving element for driving the substrate to rotate according to a predetermined period. Optionally, the driving device includes a motor, wherein the base is disposed in close contact with the motor, and the motor drives the base to rotate. For example, the base body has a substantially disk shape, and the center portion thereof is fixed to a rotary shaft of the motor so as to be rotatable. As an implementation mode, a shaft hole is arranged at the center of the base body, a fixing ring is arranged at the shaft hole, a rotating motor penetrates through the shaft hole through a rotating shaft and is fastened with the fixing ring, so that the rotating motor can drive the base body through the rotating shaft, and corresponding treatment is carried out when exciting light strikes different partitions of the base body. Optionally, the driving element drives the substrate to rotate at a constant speed or at a non-constant speed, so that the output time sequence of the laser can be controlled more flexibly.
Illustratively, the wavelength conversion device 105 includes a number of partitions including at least two wavelength conversion partitions that wavelength convert excitation light 201 incident on the wavelength conversion device 105 to produce first stimulated light 202 and second stimulated light 203, and a blank partition of the excitation light 201 that passes through the wavelength conversion device 105 without wavelength conversion. As an example, the blank sections are indentations or are made of a transparent material, including but not limited to glass, resin, etc., that does not alter the properties of the excitation light 201.
Further, the wavelength of the excitation light is different from that of the stimulated light, that is, the excitation light and the stimulated light are different colors of light. For example, the wavelength converting partition surface is provided with a wavelength converting material including, but not limited to, a red light converting material, a green light converting material, a blue light converting material, and a yellow light converting material. As an example, the excitation light 201 is blue light, and the wavelength conversion material includes a red light conversion material and a green light conversion material, so that the generated first stimulated light 202 and second stimulated light 203 are red light and green light, respectively, thereby enabling the laser projection apparatus to generate three primary colors.
The laser projection apparatus of the present invention further comprises a color filtering means 107 configured to filter said received laser light.
Referring to fig. 3A and 3B, the color filtering device 107 includes a rotary color filtering structure and a driving member for driving the color filtering structure to rotate, wherein the color filtering structure is a rotatable wheel structure.
Referring to fig. 3A, the wheeled device includes a circular plate-like structure. As one example, the color filtering structure includes a filter including, but not limited to, a red filter, a green filter, a blue filter, and a yellow filter, and as one example, the color filtering structure includes a red filter.
Referring to fig. 3B, the color filtering means 107 further comprises a driving element for driving the color filtering structure to rotate according to a predetermined period. Optionally, the driving device includes a motor, wherein the color filter structure is disposed adjacent to the motor, and the color filter structure is rotated by the motor. For example, the color filter structure is substantially disc-shaped, and the center portion thereof is fixed to a rotation shaft of a motor and is rotatable. As an embodiment, a shaft hole is arranged at the center of the color filtering structure, a fixing ring is arranged at the shaft hole, a rotating motor penetrates through the shaft hole by a rotating shaft and is fastened with the fixing ring, so that the rotating motor can drive the color filtering structure by the rotating shaft, and corresponding treatment is carried out when the laser penetrates through different partitions of the color filtering structure. Optionally, the driving element drives the color filtering structure to rotate at a constant speed or at a non-constant speed, so that the output time sequence of the excitation light and the received laser can be more flexibly controlled.
Illustratively, the color filter device 107 includes a plurality of subareas, the plurality of subareas includes at least one color filter subarea and one transmission subarea, the color filter subareas can filter light of a specific section, specifically, the color filter subareas filter the first stimulated light 202 and/or the second stimulated light 203 incident on the color filter device 107, and the transmission subareas enable the excitation light 201, the first stimulated light 202 and the second stimulated light 203 to pass through the color filter device 107. As one example, the transmissive section is a notch or is made of a transparent material including, but not limited to, glass, resin, etc., which does not cause a change in the property (e.g., color, etc.) of the laser light.
As an example, the color filter 107 filters the first excited light 202 to generate a filtered light 204, and referring to fig. 1, the excitation light 201, the second excited light 202 and the filtered light 204 passing through the color filter 107 are combined to be output.
Illustratively, the plurality of segments of the wavelength conversion device 105 corresponds one-to-one to the plurality of segments of the color filter device 107.
As an example, referring to fig. 2A and 3A, the wavelength conversion device 105 includes a wavelength conversion division region 1, a wavelength conversion division region 2, a wavelength conversion division region 3, and a blank division region, and the color filter device 107 includes a color filter division region 1, a color filter division region 2, a color filter division region 3, and a transmissive division region, wherein the wavelength conversion division region 1 corresponds to the color filter division region 1, that is, an angle of the wavelength conversion division region 1 coincides with an angular size of the color filter division region 1, and likewise, an angle of the wavelength conversion division region 2 coincides with an angular size of the color filter division region 2, and so on. Further, the wavelength converting sub-regions 1, 2, 3 and the blank sub-regions of the wavelength converting device 105 are arranged in a certain order (e.g., clockwise or counterclockwise), and the color filter regions 1, 2, 3 and the transmissive sub-regions of the corresponding color filter device 107 are also arranged in the same order (e.g., clockwise or counterclockwise). Further, the wavelength conversion device 105 and the color filter device 107 are synchronously rotated to sequentially output the three primary colors in time series.
By providing the wavelength conversion device 105 and the color filter device 107, and the wavelength conversion division 1, the wavelength conversion division 2, the wavelength conversion division 3, and the blank division of the wavelength conversion device 105 correspond to the color filter division 1, the color filter division 2, the color filter division 3, and the transmissive division of the color filter device 107 one-to-one, and rotating the wavelength conversion device 105 and the color filter device 107 in synchronization, three primary colors having good colors can be generated to realize a high color gamut mode of the laser projection device.
The laser projection device of the present invention further comprises an adjustment device configured to adjust said color filter device 107 to selectively achieve a color filtering effect of said color filter device.
Illustratively, the adjusting means includes divisional area positioning means of the color filter means for positioning a specified divisional area during stop of movement of the color filter means, and the positioning of the specified divisional area is cancelled before start of movement of the color filter means.
As an example, the subarea positioning means of the color filter device comprises a positioning column-positioning hole combination configured to pass the excitation light and the stimulated light through the transmission subarea.
As shown in fig. 4A and 4B, the positioning column can reciprocate, when the driving of the color filter device 107 is cut off and the rotation speed is reduced to a certain rotation speed, the positioning column is ejected and positioned into the positioning hole, so that the color filter device 107 is fixed, and by arranging the positioning hole at a proper position of the color filter device 107, it can be realized that the excitation light 201, the first stimulated light 202 and the second stimulated light 203 just pass through a designated subarea when the positioning column is positioned into the positioning hole. Further, when the color filter device 107 needs to be rotated, the positioning column is withdrawn from the positioning hole, and the motor drives the color filter device 107 to rotate.
Illustratively, the adjusting device comprises a displacement device of the color filter device, the displacement device is configured to switch the color filter device between a first designated position and a second designated position, further, the first designated position means that the color filter device is not positioned or partially positioned in the optical path range of the exciting light and the stimulated light, and high brightness effect is realized; the second appointed position is that the color filter device is located in the light path range of the exciting light and the stimulated light, and high color gamut effect is achieved.
As an example, the color filter device 107 may be fixed on a displacement device capable of reciprocating, when the color filter device 107 stops rotating, the color filter device 107 is driven by the displacement device to reach the first designated position, and the displacement device may adopt a linear motion, a rotational motion or other mechanical motion to make the color filter device 107 reach the first designated position, so that the color filter device is not located or partially located in the optical path range of the excitation light and the stimulated light, as shown in fig. 5B, to realize the high brightness mode of the laser projection device. Further, when it is necessary to rotate the color filter device 107, the color filter device 107 is driven to return to the optical path by the displacement device, and further, the color filter device 107 is driven to the second designated position by the displacement device, and the displacement device may adopt a linear motion, a rotational motion or other mechanical motion to drive the color filter device 107 to the second designated position, so that the color filter device is located in the optical path range of the excitation light and the stimulated light, as shown in fig. 5A, to realize the high color gamut mode of the laser projection apparatus.
Illustratively, the laser projection apparatus of the present invention further includes a shaping lens unit to converge or collimate the excitation light and/or the stimulated light.
Illustratively, the optical path shaping element at least comprises a lens array, and the lens array comprises a plurality of lenses, wherein the number, the type and the arrangement mode of the lenses can be set according to actual needs.
As an example, referring to fig. 1, the shaping lens unit includes a first convex lens 1021 and a concave lens 1022 sequentially disposed between the laser light source 101 and the dichroic element 104, the first convex lens 1021 converges the excitation light 201 of the laser light source 101, and the concave lens 1022 collimates the excitation light 201 to achieve adjustment of the excitation light 201. The shaping lens unit further includes a second convex lens 1023 disposed between the dichroic element 104 and the wavelength conversion device 105, which can converge the excitation light 201 to collimate the first and second stimulated light 202, 203. The shaping lens unit further includes a third convex lens 1024 disposed between the wavelength conversion device 105 and the first mirror 1061, which can collimate the excitation light 201 passing through the wavelength conversion device. The shaping lens unit further includes a fourth convex lens 1025, which is disposed between the dichroic element 104 and the color filter device 107, and which can condense the excitation light 201, the first excited light 202, and the second excited light 203.
Further, the laser projection apparatus of the present invention further includes a light scattering element (e.g., a scattering sheet) to destroy the coherence of the excitation light 201 and obtain a uniform light source. Specifically, a first diffusion sheet 1031 is disposed between the concave lens 1022 and the dichroic element 104, and a second diffusion sheet 1032 is disposed between the second mirror 1062 and the third mirror 1063, wherein the second diffusion sheet may also be disposed between the third mirror 1063 and the dichroic element 104, or between the first mirror 1061 and the second mirror 1062.
The invention also provides a control method of the laser projection device, which comprises the following steps:
s101: the laser light source generates exciting light;
s102: the wavelength conversion device is used for carrying out wavelength conversion on the exciting light to generate stimulated light;
s103: when the laser projection device is switched to a high color gamut mode, the adjusting device adjusts a color filtering device to enable the color filtering device to filter the received laser light or part of the received laser light;
s104: when the laser projection device is switched to a high-brightness mode, the adjusting device adjusts the color filtering device to enable the color filtering device not to filter the received laser light.
Illustratively, the color filtering means filters the received laser light when the laser projection device 107 is in the high color gamut mode.
As an example, the laser light source 101 generates the excitation light 201, a portion of the excitation light 201 passes through the blank partition of the wavelength conversion device 105 after passing through the shaping lens unit and the dichroic element 104, and is reflected by the optical path guiding unit and passes through the dichroic element 104 again, another portion of the excitation light 201 is incident on the wavelength conversion device 105 for wavelength conversion to generate the first stimulated light 202 and the second stimulated light 203, and the first stimulated light 202 and the second stimulated light 203 are reflected by the dichroic element 104 and then combined with the excitation light 201; when the laser projection device is switched to the high color gamut mode, as shown in fig. 1, the color filter device 107 filters the first excited light 202 to generate a filtered light 204, and the excitation light 201, the second excited light 202 and the filtered light 204 are combined to output.
Illustratively, when the laser projection device 107 is switched to the high brightness mode, the color filter device stops moving, and the adjusting device adjusts the positions of the designated subareas of the color filter device so that the excitation light and the stimulated light pass through the transmission subareas of the color filter device.
As an example, the subarea positioning means of the color filter device comprises a positioning column-positioning hole combination configured to pass the excitation light and the stimulated light through the transmission subarea.
As shown in fig. 4A and 4B, the positioning column can reciprocate, when the driving of the color filter device 107 is cut off and the rotation speed is reduced to a certain rotation speed, the positioning column is ejected and positioned into the positioning hole, so that the color filter device 107 is fixed, and by arranging the positioning hole at a proper position of the color filter device 107, it can be realized that the excitation light 201, the first stimulated light 202 and the second stimulated light 203 just pass through the transmission subarea when the positioning column is positioned into the positioning hole.
Further, when the laser projection device is switched to the high color gamut mode, the adjustment device cancels the adjustment of the position of the color filter device designated subarea, and the color filter device starts to move, so that the color filter device filters the stimulated light or part of the stimulated light. As an example, when the laser projection apparatus is switched to the high color gamut mode, it is necessary to rotate the color filter apparatus 107, withdraw the positioning post from the positioning hole, and rotate the color filter apparatus 107 by the motor.
Illustratively, when the laser projection device is switched to a high brightness mode, the color filter device stops rotating, and the adjusting device adjusts the color filter device to a first designated position, wherein the first designated position is that the color filter device is not positioned or partially positioned in the optical path range of the excitation light and the stimulated light, so that a high brightness effect is realized.
As an example, the color filter device 107 may be fixed on a displacement device capable of reciprocating, when the laser projection device is switched to the high brightness mode, the color filter device 107 needs to be stopped to rotate, and the color filter device 107 is driven to leave the optical path by the displacement device, and the displacement device may use a linear motion, a rotary motion or other mechanical motion to move the color filter device 107 away from the optical path, as shown in fig. 5B.
Further, when the laser projection device is switched to the high color gamut mode, the adjusting device adjusts the color filter device to a second appointed position, the second appointed position is appointed to enable the color filter device to be located in the range of the light paths of the exciting light and the stimulated light, the high color gamut effect is achieved, and the color filter device starts to move.
As an example, when the laser projection apparatus is switched to the high color gamut mode, it is necessary to rotate the color filter device 107, and then the color filter device 107 is brought back to the optical path by the displacement device, as shown in fig. 5A.
The color filter device 107 is adjusted by an adjusting device, including the position of the transmission subarea or the position of the whole color filter device 107 in the light path, so that the color filtering function of the color filter device can be selectively realized, whether the exciting light and the received laser light are filtered by the color filter device 107 or not is controlled, when the color filter device 107 filters the color, the laser projection device is in a high color gamut mode, and when the color filter device 107 does not filter the color, the laser projection device is in a high brightness mode, therefore, the laser projection device provided by the invention simultaneously meets the output requirements of high brightness and high color gamut.
Illustratively, the driving current of the excitation light and/or the stimulated light is adjusted when the laser projection device is switched from a high color gamut mode to a high brightness mode or from the high brightness mode to the high color gamut mode.
As an example, although the brightness and color gamut of the laser projection device are substantially fixed after the structure of the laser projection device is determined, the brightness and color gamut of the laser projection device can be fine-tuned by adjusting the driving current. Preferably, the control of the driving current in the high color gamut mode and the high brightness mode is realized by adjusting the driving current of each color segment as shown in fig. 6, and the distortion of the white map color caused by the mode switching can be further avoided. Table 1 shows the contrast of the luminance in the high luminance mode with the luminance in the high color gamut mode:
TABLE 1
It can be seen that the luminance in the high luminance mode is improved by about 20% over the luminance in the high color gamut mode.
Illustratively, when the laser projection device is switched from the high color gamut mode to the high brightness mode or from the high brightness mode to the high color gamut mode, the picture output of the laser projection device is set to be a dark picture, so that defects which can be seen by a user and comprise flickering, color distortion and the like are avoided in the process of switching the modes.
According to the laser projection device and the control method thereof provided by the invention, the laser light source and the wavelength conversion device are used for generating the exciting light and the received laser light to generate three primary colors, the adjusting device is used for adjusting the color filtering device to selectively realize the color filtering function of the color filtering device, and further, the state switching of the color filtering device for filtering and not filtering the received laser light is realized, so that the switching between the high color gamut mode and the high brightness mode of the laser projection device is realized.
The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (12)
1. A laser projection device, comprising:
a laser light source configured to generate excitation light;
a wavelength conversion device configured to wavelength-convert the excitation light to generate stimulated light;
a color filtering device configured to filter the received laser light;
an adjustment device configured to adjust the color filter device to selectively achieve a color filtering effect of the color filter device.
2. The laser projection device of claim 1, wherein the excitation light comprises a blue laser, a violet laser, or an ultraviolet laser.
3. The laser projection device of claim 1, wherein the wavelength conversion device comprises at least two wavelength conversion sub-sections to generate the first excited light and the second excited light, and at least one blank sub-section to pass the excitation light through the wavelength conversion device.
4. A laser projection device as claimed in claim 1, wherein the color filter means comprises at least one color filter section for filtering the first excited light and/or the second excited light, and at least one transmissive section for passing the excited light and/or the excited light through the color filter means without filtering.
5. The laser projection apparatus according to claim 1, wherein the adjusting means includes a divisional area positioning means of the color filter means for positioning a specified divisional area during the stop of the movement of the color filter means, and canceling the positioning of the specified divisional area before the start of the movement of the color filter means.
6. The laser projection device of claim 1, wherein the adjustment device comprises a displacement device of the color filter device configured to switch the color filter device between a first specified position and a second specified position.
7. The laser projection apparatus according to claim 6, wherein the first prescribed position means that the color filter means is not located or partially located within the optical path range of the excitation light and the stimulated light, achieving a high brightness effect; the second appointed position is that the color filter device is located in the light path range of the exciting light and the stimulated light, and high color gamut effect is achieved.
8. A control method of a laser projection device is characterized by comprising the following steps:
the laser light source generates exciting light;
the wavelength conversion device is used for carrying out wavelength conversion on the exciting light to generate stimulated light;
when the laser projection device is switched to a high color gamut mode, the adjusting device adjusts a color filtering device to enable the color filtering device to filter the received laser light or part of the received laser light;
when the laser projection device is switched to a high-brightness mode, the adjusting device adjusts the color filtering device to enable the color filtering device not to filter the received laser light.
9. The control method of claim 8, wherein the color filter means stops moving when the laser projection means is switched to a high brightness mode, and the adjusting means adjusts positions of the color filter means designated subareas so that the excitation light and the stimulated light pass through the transmission subareas of the color filter means; when the laser projection device is switched to a high color gamut mode, the adjusting device cancels the adjustment of the position of the specified subarea of the color filter device, and the color filter device starts to move to enable the color filter device to filter the laser receiving light or part of the laser receiving light.
10. The control method according to claim 11, wherein when the laser projection apparatus is switched to the high brightness mode, the color filter means stops moving, and the adjusting means adjusts the color filter means to a first designated position such that the color filter means is not located or partially located within an optical path range of the excitation light and the stimulated light, thereby achieving a high brightness effect; when the laser projection device is switched to the high color gamut mode, the adjusting device adjusts the color filter device to a second appointed position, the second appointed position is appointed to enable the color filter device to be located in the range of the light paths of the exciting light and the received laser light, the high color gamut effect is achieved, and the color filter device starts to move.
11. The control method according to claim 7, wherein the drive current for each period of the excitation light is adjusted when the laser projection apparatus is switched from the high color gamut mode to the high brightness mode or from the high brightness mode to the high color gamut mode.
12. The control method according to claim 7, wherein the laser projection apparatus outputs a dark picture when the laser projection apparatus is switched from the high color gamut mode to the high luminance mode or from the high luminance mode to the high color gamut mode.
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| CN201910053542.8A CN111458966A (en) | 2019-01-21 | 2019-01-21 | Laser projection device and control method thereof |
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| CN201910053542.8A CN111458966A (en) | 2019-01-21 | 2019-01-21 | Laser projection device and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117930574A (en) * | 2024-03-21 | 2024-04-26 | 宜宾市极米光电有限公司 | Light source device and projection apparatus |
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| US20140226306A1 (en) * | 2013-01-29 | 2014-08-14 | Texas Instruments Incorporated | Color Sequence Illumination System with Phosphor Light Filter |
| CN104298059A (en) * | 2014-10-20 | 2015-01-21 | 海信集团有限公司 | Laser light source and projection display device |
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| JP2004354957A (en) * | 2003-05-29 | 2004-12-16 | Plus Vision Corp | Color wheel device |
| CN1924696A (en) * | 2005-09-01 | 2007-03-07 | 精工爱普生株式会社 | Projector |
| JP2008197390A (en) * | 2007-02-13 | 2008-08-28 | Sharp Corp | Projector |
| US20140226306A1 (en) * | 2013-01-29 | 2014-08-14 | Texas Instruments Incorporated | Color Sequence Illumination System with Phosphor Light Filter |
| CN104298059A (en) * | 2014-10-20 | 2015-01-21 | 海信集团有限公司 | Laser light source and projection display device |
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Application publication date: 20200728 |