CN111338166A - Laser light source and laser projector - Google Patents
Laser light source and laser projector Download PDFInfo
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- CN111338166A CN111338166A CN201811557926.5A CN201811557926A CN111338166A CN 111338166 A CN111338166 A CN 111338166A CN 201811557926 A CN201811557926 A CN 201811557926A CN 111338166 A CN111338166 A CN 111338166A
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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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
- G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
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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
- G03B21/208—Homogenising, shaping of the illumination light
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Abstract
The invention relates to a laser light source and a laser projector, and belongs to the field of laser projection display. The laser light source includes: a blue laser emitting blue laser light; the color wheel comprises a plurality of areas arranged along a first circumferential direction, the plurality of areas arranged along the first circumferential direction comprise at least one pair of first areas with the same emergent light color, a second area is arranged between each pair of first areas, and the emergent light colors of the first areas and the second areas are different; at least one of the first region and the second region is a fluorescent region; the color wheel also comprises a plurality of areas which are arranged along the second circumferential direction, and the plurality of areas which are arranged along the second circumferential direction comprise filter areas which are arranged corresponding to the first area and the second area; the color wheel outputs red light, blue light and green light in a time sequence. The present invention achieves a reduction in spoke light. The invention is used for designing the laser light source.
Description
Technical Field
The invention relates to the field of laser projection display, in particular to a laser light source and a laser projector.
Background
The laser light source is a light source that emits monochromatic coherent light beams with high brightness and high directivity, and has been gradually applied to the field of projection display in recent years due to many advantages of the laser light source. Current laser light sources typically include at least: a laser, a color wheel, and a light bar. The working process of the laser light source comprises the following steps: the laser emits laser, the laser irradiates on the fluorescent wheel, fluorescent powder on the fluorescent wheel is excited to output fluorescent light with at least one color, the fluorescent light with at least one color is obtained through filtering processing of the color filtering wheel, and the laser and the light with at least one color realize the lighting function of the laser light source after the light homogenizing processing of the light rod. The optical-mechanical part comprises a light valve core component, the light valve receives the illumination light beam of the front-end laser light source and modulates the light beam, a DLP (digital light processing) architecture is mostly adopted at present, the color time sequence output by the color wheel needs to be synchronous with the light valve, and thus the light valve can receive the illumination light beam emitted by the laser light source in time sequence according to the control signal of the color component of the image to be displayed.
The conventional fluorescent wheel and color filter wheel both have a plurality of areas, and light of different colors has an obvious boundary when being output, but in practical application, light spots have a certain size and can irradiate the boundary when passing through the boundary of the color wheel (the fluorescent wheel and the color filter wheel are collectively called), and at the moment, because the light spots are positioned on the two areas and the colors of the light emitted from the two areas are different, the colors of the light emitted from the light spots after passing through the two areas are mixed, namely, mixed light (also called wheel radiation) is generated, which is a color mixing phenomenon, and the light mixing phenomenon makes the light machine unable to distinguish the current primary color light.
One of the processing methods that is commonly used at present is: the light emitted from the color mixing region (the region for generating the mixed color light, also called the spoke region) is discarded and not utilized, but as the number of the subareas is larger, for example, as shown in fig. 12, three groups of color subareas are symmetrically arranged according to the vertex of the central angle, that is, the color wheel has 6 subareas in a circle (the 6 subareas of the color wheel are respectively a yellow fluorescent region Y1, a yellow fluorescent region Y2, a green fluorescent region G1, a green fluorescent region G2, a transmission region B1 and a transmission region B2, and the 6 subareas of the color wheel are respectively a red filter region r1, a red filter region r2, a green filter region G1, a green filter region G2, a transmission region B1 and a transmission region B2), so that a full time sequence of three primary colors can be provided by a half-circle of the color wheel, and two three-primary-color-. However, it is obvious that the number of spoke regions is also increased, and there is one spoke region between every two sub-regions, and there are 6 spoke regions in total, so that this processing method can obviously lose part of the primary light, which not only results in the loss of the brightness of the projection picture, but also affects the proportion of the primary light in the original white balance, and further affects the display of the projection picture.
If fewer partitions are arranged for the color wheel, for example, only three partitions are arranged along the circumference of the color wheel, so that the spoke areas can be reduced along with the reduction of the number of the partitions, and according to the display requirement of forming a complete image by three primary colors, the color wheel can provide three primary color light components required by image display after rotating for one circle, namely, the color wheel provides one three primary color time sequence period after rotating for one circle, although an image picture can be displayed, the longer the period for providing the complete three primary color light time sequence is, or the slower the rotating speed of the color wheel is, the higher the probability of the occurrence of a rainbow phenomenon during the display of the projection picture is, and the rainbow phenomenon refers to a color stripe phenomenon observed on the projection picture by human eyes. This also reduces the viewing quality of the projected picture.
Disclosure of Invention
The embodiment of the invention provides a laser light source and laser projection equipment, which can provide a plurality of primary color light time sequence output periods when a color wheel rotates for one circle and can also reduce the number of spoke areas, and the adopted technical scheme is as follows:
in a first aspect, a laser light source is provided, which includes:
a blue laser emitting blue laser light;
the color wheel comprises a plurality of areas arranged along a first circumferential direction, the plurality of areas arranged along the first circumferential direction comprise at least one pair of first areas with the same emergent light color, a second area is arranged between each pair of first areas, and the emergent light colors of the first areas and the second areas are different;
at least one of the first region and the second region is a fluorescent region;
the color wheel also comprises a plurality of areas which are arranged along the second circumferential direction, and the plurality of areas which are arranged along the second circumferential direction comprise filter areas which are arranged corresponding to the first area and the second area;
the color wheel outputs tricolor light in time sequence, wherein the tricolor light is red light, blue light and green light;
further, the first circumferential direction and the second circumferential direction are arranged along the radial direction of the color wheel;
further, the first circumferential direction is located outside the color wheel, and the second circumferential direction is located inside the color wheel;
furthermore, a plurality of regions arranged along the first circumferential direction and a plurality of regions arranged along the second circumferential direction are arranged on the same substrate, and the substrate is a metal substrate;
further, the plurality of regions arranged along the first circumferential direction further include a laser scattering region including a scattering layer coated on the metal substrate; correspondingly, the plurality of regions arranged along the second circumferential direction further comprise transmission regions for transmitting the laser emitted by the laser scattering region;
further, the plurality of regions arranged in the first circumferential direction include two green fluorescent regions, two yellow fluorescent regions, and a laser scattering region, the first region is a first green fluorescent region, the second region is a yellow fluorescent region, or the first region is a second yellow fluorescent region, and the second region is a green fluorescent region;
correspondingly, the plurality of regions arranged along the second circumferential direction comprise two green filter regions, two red filter regions and a transmission region;
furthermore, the ratio of the angle of the center of the circle of the yellow fluorescent region is equal to that of the angle of the center of the circle of the red filter region;
the ratio of the angle of the circle center of the green fluorescent area is equal to that of the angle of the circle center of the green filter area;
the ratio of the circle center angle of the laser scattering area to the circle center angle of the transmission area is equal;
furthermore, the central angles of the sectors where the fluorescent regions are located in the plurality of regions arranged along the first circumferential direction and the central angles of the filter regions correspondingly arranged in the plurality of regions arranged along the second circumferential direction are opposite angles;
the central angles of the fan-shaped laser scattering areas in the plurality of areas arranged along the first circumferential direction and the central angles of the transmission areas correspondingly arranged in the plurality of areas arranged along the second circumferential direction are opposite vertical angles;
further, the laser light source further includes:
the multiple groups of lasers combine light through the first light combining lens, and the light beams after light combination are homogenized through the fly eye lens;
further, the laser light source further includes: a second light combining lens for transmitting blue laser, wherein the blue laser is incident to a plurality of areas arranged along the first circumferential direction of the color wheel after being transmitted,
the fluorescence areas in the multiple areas arranged along the first circumferential direction are excited to generate fluorescence, and the fluorescence is reflected and then enters the second light combining lens and is reflected to the fourth reflecting lens by the second light combining lens;
laser scattering areas in the multiple areas arranged along the first circumferential direction scatter laser, the laser is reflected to the second light combining lens and is transmitted to the third reflecting lens through the second light combining lens;
the fourth reflector reflects the fluorescence to the filter area in a plurality of areas arranged along the second circumferential direction;
and the third reflector reflects the laser to the fourth reflector, and the fourth reflector reflects the laser to the transmission area in the plurality of areas arranged along the second circumferential direction.
In a second aspect, there is provided a laser projector, comprising:
the projection device comprises an optical machine, a projection lens and a laser light source, wherein the laser light source is the laser light source in the first aspect;
the optical machine is used for modulating the light beam to generate an image light beam when being irradiated by the light beam emitted by the laser light source;
the projection lens is used for projecting the image light beam to a projection screen.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
in the laser light source and the laser projector provided by the embodiment of the invention, when a light spot passes through the color wheel, the light spot only generates a small amount of spoke light while ensuring that a plurality of time sequence period primary color lights are provided in one circle of the color wheel, and the reduction of the amount of the spoke area light can reduce the complexity of the light processing of the area by an electronic software program on one hand.
And more importantly, when the spoke light is processed in a manner of abandoning the spoke light area, namely the electronic software control can be relatively simple and reliable, the scheme of the spoke light with a small number can reduce the loss of various primary color lights, further reduce the loss of the brightness of the whole projection picture, reduce the influence of the lost primary color lights on the proportion in the primary white balance, and be beneficial to presenting high-quality projection picture display.
Furthermore, by arranging the multi-color-division segments, the color wheel can provide complete 3-color light with 2 time sequence periods in one rotation, which is also called as tricolor light (namely tricolor light components), so that the time for emitting 1 group of complete 3-color light by the color wheel is shortened, the probability of rainbow phenomenon is reduced, and the viewing quality of pictures is improved.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
Fig. 1 is a schematic diagram of a laser projection apparatus according to some embodiments of the present invention.
Fig. 2 is a schematic diagram of a color wheel arrangement structure along a first circumferential direction according to an exemplary embodiment of the present invention.
Fig. 3 is a schematic diagram of a color wheel arranged along a first circumferential direction according to an exemplary embodiment of the present invention.
Fig. 4 is another schematic diagram of a color wheel arranged along a first circumferential direction according to an exemplary embodiment of the present invention.
Fig. 5 is a schematic diagram of a color wheel arranged along a first circumferential direction according to an exemplary embodiment of the present invention.
Fig. 6 is a schematic diagram of a color wheel arranged along a first circumferential direction according to an exemplary embodiment of the present invention.
Fig. 7 is a schematic diagram of a color wheel arranged along a first circumferential direction according to an exemplary embodiment of the invention.
Fig. 8 is a schematic diagram of a color wheel arranged along a second circumferential direction according to an exemplary embodiment of the invention.
Fig. 9 is a schematic structural diagram of a color wheel according to an exemplary embodiment of the present invention.
Fig. 10 is a schematic diagram of another structure of a color wheel according to an exemplary embodiment of the present invention.
Fig. 11 is a schematic structural diagram of another laser light source according to an exemplary embodiment of the invention.
Fig. 12 is a schematic diagram of color segmentation of a color wheel of the prior art.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic diagram of an implementation environment according to some embodiments of the invention is shown. The implementation environment may include: the laser projection system comprises a laser light source 10, an optical machine 20 and a projection lens 30, wherein the laser light source 10, the optical machine 20 and the projection lens 30 are sequentially arranged along a light beam transmission direction. The laser light source 10 is configured to emit a light beam, the optical engine 20 is configured to modulate the light beam to generate an image light beam when being irradiated by the light beam emitted from the laser light source 10, and the projection lens 30 is configured to project the image light beam onto the projection screen 40.
For example, the laser light source 10, the optical engine 20, and the projection lens 30 may be applied to the laser projector 1. There are many laser light sources of the current laser projectors, and the laser light source may include: at least one laser, the laser light source is used for emitting laser light of at least one color. For example, the laser light source may be a single-color laser light source (i.e., including one laser and emitting laser light of one color), or may be a two-color laser light source (i.e., including a plurality of lasers and emitting laser light of two colors in common).
In this example, the laser is a blue laser, and may be a group or multiple groups, and multiple groups of lasers need to be combined to form a laser beam.
As shown in fig. 2, the color wheel 180 in this example includes a plurality of regions arranged in the first circumferential direction, the plurality of regions arranged in the first circumferential direction includes at least one pair of first regions SG1 emitting light with the same color, each pair of first regions SG1 is separated by a second region SG2, and the colors of the light emitted by the first region SG1 and the second region SG2 are different;
at least one of the first region SG1 and the second region SG2 is a fluorescent region;
the color wheel 180 further includes a plurality of regions arranged along the second circumferential direction, where the plurality of regions arranged along the second circumferential direction include filter regions LG1 disposed corresponding to the first region SG1 and the second region SG 2;
the color wheel outputs red light, blue light and green light in a time sequence.
In the above example, in order to provide a complete tricolor light sequence, the regions SG3 and SG4 arranged in the first circumferential direction may output the same color, or SG4 and SG2 may output the same color.
The first circumferential direction and the second circumferential direction are arranged along the radial direction of the color wheel. Specifically, the first circumferential direction is located outside the color wheel 180, and the second circumferential direction is located inside the color wheel 180.
According to the color wheel structure in the laser light source provided by the embodiment of the invention, the first color area is symmetrically arranged relative to the second color area, so that the second color area can be actually divided into two second color areas, and at least one spoke area is reduced while three-primary-color time sequences are respectively formed with each first color area. Therefore, when the color wheel rotates for a circle to provide a plurality of time sequence period primary color lights, only a small amount of spoke light can be generated, on one hand, the complexity of the electronic software program for processing the area light can be reduced by reducing the number of the spoke area light, for example, if the color mixing section is not abandoned but utilized, the white balance is required to be recalculated and the ratio is calculated, the rotation position of the color wheel is accurately controlled, the duration of the color mixing section is judged and is benefited, and the complexity of the electronic software control is necessarily reduced by reducing the number of the spoke area light.
And more importantly, when the spoke light is processed in a manner of abandoning the spoke light area, namely the electronic software control can be relatively simple and reliable, the scheme of the spoke light with a small number can reduce the loss of various primary color lights, further reduce the loss of the brightness of the whole projection picture, reduce the influence of the lost primary color lights on the proportion in the primary white balance, and be beneficial to presenting high-quality projection picture display.
Furthermore, by arranging the multi-color-division segments, the color wheel can provide complete light with 3 colors in 2 time sequence periods in one rotation, namely three-color light (namely three-primary-color light components), so that the rotating speed of the color wheel is increased, the time for the color wheel to emit 1 group of complete light with 3 colors is shortened, the probability of rainbow phenomenon can be reduced, and the viewing quality of a projection picture is improved.
As shown in fig. 3, fig. 3 is a schematic diagram of an arrangement structure of a color wheel along a first circumferential direction according to an embodiment of the present invention. The color wheel 110 comprises:
a substrate 1101. A plurality of regions in which the color wheel 110 is arranged in the first circumferential direction are provided on the substrate 1101. The plurality of regions includes n fluorescent regions and m transmissive regions. Illustratively, 1< n <5, 0< m <3, and 3< m + n <6, wherein the plurality of regions emit light of at least three colors, and wherein each two adjacent regions emit light of a different color. For example, the light emitted from the plurality of regions has green (corresponding to the green fluorescent region G), yellow (corresponding to the yellow fluorescent region Y), and blue (corresponding to the transmissive region B). Fig. 3 is a schematic illustration of an example of a substrate 1101 having 1 yellow fluorescent region Y, 2 green fluorescent regions G and 1 transmissive region B.
Optionally, each region on the color wheel may be in a fan shape or a fan-ring shape, and the area of each region may be represented by the degree of the central angle of the region, so that the area of light emitted from each region is the angle of light emitted from each region. The angle of the light emitted by the color wheel includes the angle of the spoke light and the angle of the pure color light, and under the condition that the angle of the light actually emitted by the color wheel is not changed, the angle of the spoke light is negatively correlated with the angle of the pure color light, that is, the angle of the spoke light is larger, and the angle of the corresponding pure color light is reduced.
In order to enable the fluorescent regions to emit fluorescent light with different colors under the excitation of blue laser, green fluorescent powder or yellow fluorescent powder is arranged on the surface of each fluorescent region, so that when the fluorescent regions are irradiated by the blue laser, the fluorescent powder with the corresponding color can be excited to emit light with the color corresponding to the fluorescent powder. For example, the colors of the light emitted from the plurality of regions include: the color of light emitted by the n fluorescent regions comprises green and yellow, the color of light emitted by the n fluorescent regions comprises a green fluorescent region and a yellow fluorescent region, and the color of light emitted by the m transmission regions is blue.
Since the requirement of the user for the picture of the projection screen is higher and higher, for example, the display frequency is 240HZ, and for the frequency of image display, the three-color segment color wheel (the color wheel having three regions of yellow fluorescent region, green fluorescent region and transmission region) needs to increase the frequency of emitting three-color light (yellow light, green light and blue light) to emit light of faster frequency to the optical engine, therefore, the three-color segment color wheel needs to increase the rotation frequency. However, a larger rotational frequency may cause a larger noise, which may result in a poorer user experience. Therefore, in order to reduce noise and improve user experience, the color wheel may emit 1 set of three color lights under a half-cycle rotation condition, that is, emit 2 three color lights with the same time sequence period (that is, the same angles of the lights with the same color in the three color lights with 2 time sequence periods) under a one-cycle rotation condition, so as to improve the frequency of emitting the three color lights by the color wheel while maintaining the original rotation frequency.
Therefore, in order to make the color wheel rotate once to emit two groups of same three-color light, the central angle of each first area of the color wheel is equal.
Further, as shown in fig. 3, the plurality of regions may be arranged in the first circumferential direction in the following order: a yellow fluorescent region Y, a green fluorescent region G, a transmission region B and a green fluorescent region G; as shown in fig. 4, the arrangement order of the plurality of regions may be: a transmission area B, a yellow fluorescence area Y, a green fluorescence area G and a yellow fluorescence area Y; as shown in fig. 5, the arrangement order of the plurality of regions may further be: a green fluorescence area G, a yellow fluorescence area Y, a green fluorescence area G, a yellow fluorescence area Y and a transmission area B; as shown in fig. 6, the arrangement order of the plurality of regions may be: a transmission region B, a yellow fluorescence region Y, a transmission region B and a green fluorescence region G.
The size of the areas of the plurality of regions, that is, the size of the corresponding circumferential angles of the plurality of regions, may be determined according to actual conditions.
In practical applications, the color and duration of light emitted from the plurality of regions are related to the arrangement order of the plurality of regions, the size of the circumferential angle corresponding to the plurality of regions, and the rotational frequency of the color wheel, for example, assuming that the arrangement order of the plurality of regions is a yellow fluorescent region, a green fluorescent region, a transmissive region, and a green fluorescent region, the size of the circumferential angle corresponding to the plurality of regions may be 100 °, 80 °, 100 °, and 80 °, and the rotational frequency of the color wheel is 120HZ, the duration of yellow fluorescent light emitted from the yellow fluorescent region is Tr, Tr = (100/360) × (1/120) seconds, the duration of green fluorescent light emitted from each green fluorescent region is Tg, = (80/360) × (1/120) seconds, the duration of blue laser light emitted from the transmissive region is Tb, Tb = (5636) 1/120) seconds, assuming that the color wheel is rotated from the projection region, the color wheel emits green fluorescent light after Tb, the blue fluorescent light, the color wheel Tr, and the yellow fluorescent light is emitted after … in turn.
Optionally, as shown in fig. 7, the color wheel 110 further includes a driving structure 1102, where the driving structure 1102 is located in a circle center region of the annular substrate 1101, and the driving structure 1102 is connected to the substrate 1101, and the driving structure 1102 is configured to drive the substrate 1101 to rotate. Illustratively, the drive structure 1102 may be a motor. The driving structure 1102 may be fixedly connected to the substrate 1101 by a ring connector (not shown in fig. 7), which may make the driving structure 1102 more tightly connected to the substrate 1101. The annular connecting piece can be an annular metal sheet, and due to the fact that metal is good in ductility, the annular connecting piece is not prone to breaking when receiving rotating force generated by rotation of the driving structure for a long time, and effective connection of the driving structure and the substrate is guaranteed.
Optionally, as shown in fig. 8, fig. 8 is a schematic diagram of an arrangement structure of the color wheel along the second circumferential direction according to the embodiment of the present invention. The plurality of regions of the color wheel 120 arranged along the second circumferential direction include a red filter region r, a green filter region g, and a transmission region b. The red filter area r is used for filtering yellow fluorescence to obtain red light, the green filter area is used for filtering green fluorescence to obtain green light, and the transmission area b is used for transmitting laser or fluorescence. Fig. 8 schematically illustrates that the plurality of regions of the color wheel 120 arranged along the second circumferential direction include 1 red filter region r, 2 green filter regions g, and 1 transmissive region b.
The plurality of regions of the color wheel arranged along the second circumferential direction correspond to the plurality of regions of the color wheel, so that when the arrangement sequence of the plurality of regions of the color wheel is changed, the arrangement sequence of the plurality of regions of the color wheel arranged along the second circumferential direction is changed.
Then, when the arrangement sequence of the plurality of regions arranged along the first circumferential direction of the color wheel is the YGBG shown in fig. 3, correspondingly, the arrangement sequence of the plurality of regions arranged along the second circumferential direction is the red filter region, the green filter region, the transmissive region and the green filter region;
when the sequence of the plurality of regions arranged along the first circumferential direction of the color wheel is BYGY as shown in fig. 4, correspondingly, the sequence of the plurality of regions arranged along the second circumferential direction is a transmission region, a red filter region, a green filter region, and a red filter region;
when the arrangement sequence of the plurality of regions arranged along the first circumferential direction of the color wheel is gyyb as shown in fig. 5, correspondingly, the arrangement sequence of the plurality of regions arranged along the second circumferential direction is a green filter region, a red filter region, and a transmission region;
when the arrangement sequence of the plurality of regions arranged along the first circumferential direction of the color wheel is BYBG as shown in fig. 6, correspondingly, the arrangement sequence of the plurality of regions arranged along the second circumferential direction is a transmission region, a red filter region, a transmission region, and a green filter region.
The ratio of the center angle of the red filter area on the color wheel 120 is equal to the ratio of the center angle of the yellow fluorescent area on the color wheel 110, the ratio of the center angle of the green filter area on the color wheel 120 is equal to the ratio of the center angle of the green fluorescent area on the color wheel 110, and the ratio of the center angle of the transmissive area on the color wheel 120 is equal to the ratio of the center angle of the transmissive area on the color wheel 110.
By designing the ratio of the center angles of the red filter area, the green filter area and the transmission area on the color wheel 120 to the center angles of the yellow fluorescent area, the green fluorescent area and the transmission area on the color wheel 110 to be equal and corresponding to the arrangement sequence, it can be ensured that when the color wheel 110 emits yellow fluorescent light, the yellow fluorescent light is completely filtered after passing through the red filter area of the color wheel 120, so that the color wheel emits red light; when the color wheel 110 emits green fluorescence, the green fluorescence passes through the green filter region of the color wheel 120, so that the color wheel emits green light; when the color wheel 110 transmits the blue laser, the blue laser passes through the transmission region of the color wheel 120, and then the color wheel 120 emits blue light, so that the effective light emission of the laser light source is ensured, and meanwhile, since the color wheel filters yellow fluorescent light to generate red light, the proportion of other primary color light components except for the red light component of the laser light source is improved.
Fig. 9 schematically illustrates an example in which the color wheel region includes a yellow fluorescence region Y1, a transmission region B, a green fluorescence region G1, a yellow fluorescence region Y2, and a green fluorescence region G2, and the color wheel region includes a red filter region r1, a transmission region B, a green filter region G1, a red filter region r2, and a green filter region G2. When the color wheel and the color wheel are disposed on the same substrate, the structure may be referred to as a color wheel 180. The color wheel and the color wheel are arranged on the same substrate, so that the color wheel is multifunctional, the number of system parts can be reduced, the miniaturization is facilitated, the manufacturing process can be reduced, and the manufacturing cost is reduced.
Since the optical engine is required to generate the image light beam only by the pure color light, the light collection component is required to selectively receive the pure color light, so that the laser light source only emits the pure color light. In practical applications, the angle of the spoke light that needs to be shielded by the light collection member needs to be determined by a color correction process so that the spoke light is not received by the light collection member. The color correction process is executed through software, the software corresponds to the size of an optical machine in the current laser projector, and the image quality requirement of the laser projector, the rotating frequency of the color wheel under the requirement, the area arrangement sequence of the color wheel and the size of the corresponding circumferential angles of a plurality of areas of the color wheel are set in the software, so that the angle for generating the spoke light is determined. The color correction process is a process of determining the angle of each spoke light on the color wheel. Since the structure of the color wheel in embodiments of the invention will only produce 4 or 5 area spoke lights, the time required for the color correction process is saved.
For example, assuming that the size of the optical valve of the optical engine is 0.47 inches, the image quality requirement is to display 4K image quality, the rotation frequency of the color wheel is 120HZ, and the area arrangement order of the color wheel is yellow fluorescent area, green fluorescent area, transmission area and green fluorescent area, the circumferential angles corresponding to the plurality of areas of the color wheel may be 100 °, 80 °, 100 ° and 80 °. Based on the foregoing parameters, it was determined by software corresponding to a 0.47 inch light machine that there were 4 spoke lights and that the angle of each spoke light was 11 °.
Further, if the brightness of the laser light source needs to be improved, the angles of the yellow fluorescent region, the green fluorescent region and the transmission region of the color wheel are changed, and simultaneously the angle of the red filter region and the angle of the transmission region on the color wheel are changed in a matching manner, so that the orthographic projection of the yellow fluorescent region on the color wheel is staggered with the red filter region by a certain region, and therefore, a part of yellow light wave band of yellow fluorescent light is reserved, namely, yellow light which does not pass through the red filter region (namely, yellow light of the staggered region) is not filtered, and further the brightness of the laser light source is improved.
In one implementation, as shown in fig. 9 and 10, the central angle of the sector where the fluorescent regions are located in the plurality of regions arranged along the first circumferential direction and the central angle of the filter region correspondingly arranged in the plurality of regions arranged along the second circumferential direction are opposite angles;
and the central angles of the fan-shaped laser scattering areas in the plurality of areas arranged along the first circumferential direction and the central angles of the transmission areas correspondingly arranged in the plurality of areas arranged along the second circumferential direction are opposite angles.
In an implementation manner, the color wheel 180 is shown in fig. 10, in the color wheel structure shown in fig. 10, the substrate is a circular metal substrate, and a reflection surface is disposed on an incident side of the metal substrate facing the laser, where the reflection surface may be implemented by coating, or by polishing the metal substrate into a mirror surface to implement reflection of a full spectrum light beam. And the color wheel area is fixed on the inner ring of the color wheel in the circular metal substrate in an embedding or bonding mode, the outer ring of the circular metal substrate is the color wheel area, specifically, the color wheel area comprises a fluorescent area (a yellow fluorescent area Y and a green fluorescent area G) coated with fluorescent powder and a laser scattering area BR coated with a scattering layer, and the scattering layer is used for scattering laser passing through the layer of structure, so that a certain speckle eliminating effect is achieved. Fig. 10 schematically illustrates an example in which the color wheel region includes a yellow fluorescent region Y1, a laser scattering region BR, a green fluorescent region G1, a yellow fluorescent region Y2, and a green fluorescent region G2, and the color wheel region includes a red filter region r1, a transmission region b, a green filter region G1, a red filter region r2, and a green filter region G2. The ratio of the center angle of the yellow fluorescent region to the center angle of the red filter region is equal, the ratio of the center angle of the green fluorescent region to the center angle of the green filter region is equal, and the ratio of the center angle of the laser scattering region to the center angle of the transmission region is equal.
Thus, the blue laser beam is reflected by the laser scattering region of the color wheel 180 to the light combining member; in another implementation manner, as shown in fig. 9, the color wheel 180 is configured such that another optical path loop is disposed on a side of the color wheel away from the blue laser, and the blue laser transmits through a transmission region of the color wheel 180 and then is transmitted to the light combining component through the optical path loop.
Fig. 11 is a schematic structural diagram of a laser light source according to an embodiment of the present invention. In the architecture shown in fig. 11, the color wheel structure shown in fig. 10 is applied.
In particular, including multiple sets of first lasers 130 may increase the brightness of the light source.
Wherein, the multiple groups of first lasers 130 are blue lasers, taking two groups of lasers as an example, the two groups of lasers can be vertically arranged in space and combined by a step mirror, or as shown in fig. 11, the two groups of lasers are combined by the first light combining lens 120 with reflective films arranged at intervals, wherein, the beams of one group of lasers all irradiate the reflective film area, the beams of the other group of lasers all irradiate the transmissive area, thus, one group of beams emitted by the two groups of lasers are transmitted, one group of beams are reflected and all emit towards the same direction, and the size of the light spot can be reduced after light combination
Preferably, the combined laser beam passes through a light homogenizing unit, which may be a fly-eye lens 180, before reaching the color wheel.
After the light is homogenized, the energy distribution of the laser beam is more uniform, and the improvement of the excitation efficiency of fluorescence is facilitated.
In this example, the color wheel 180 is the color wheel structure shown in fig. 10. In particular, the amount of the solvent to be used,
after the blue laser beam is homogenized by the fly-eye lens 180, the blue laser beam may further pass through a converging lens (not shown in the figure) to further reduce the spot area, and then enters the second light combining lens 141, where the second light combining lens 141 may be a dichroic filter, and may transmit blue light and reflect light of other colors except for the blue light, such as yellow fluorescence and green fluorescence.
The transmitted blue light is incident to the fluorescent regions in the plurality of regions arranged along the first circumferential direction (i.e., the outer circumferential direction in the figure) of the color wheel 180, and the arrangement of the fluorescent regions can be referred to the above embodiment. The fluorescent area comprises a yellow fluorescent area and a green fluorescent area which are excited to generate fluorescence with corresponding colors.
The fluorescence is reflected by the metal substrate and then enters the second light combining lens 141, the second light combining lens reflects the fluorescence of multiple colors to the fourth reflector 142, the fourth reflector 142 reflects the light beam to the filter region in the multiple regions arranged along the second circumferential direction, and the filter region can be divided into the regions according to the above embodiments. So that the fluorescence is filtered and output by the corresponding filter region.
With the rotation of the color wheel, when laser irradiates a laser scattering area in a plurality of areas arranged along a first circumferential direction, the laser scattering area comprises a scattering layer, and multi-angle divergence and scattering can be generated on the laser. Similarly, the laser light is reflected by the metal substrate, passes through the scattering layer again, and returns to the second light combining lens 141, the second light combining lens 141 transmits the blue laser light, and the transmitted laser light enters the third light combining lens 143, wherein the third light combining lens 143 is smaller than the second light combining lens 141 in size and is only used for receiving the laser light beam.
The third mirror 143 reflects the blue laser beam to the fourth mirror 142, and the fourth mirror 142 reflects the blue laser beam to a transmissive area among a plurality of areas arranged along the second circumferential direction, where the transmissive area is used for transmitting the laser beam, and the transmissive area may be flat glass or a diffusion sheet structure.
A light collecting member 160, such as a light rod, is arranged in correspondence with the light exit position of the inner circumference of the color wheel.
Preferably, a field lens 190 is further disposed between the second light combining lens 141 and the fourth mirror 142, and is used for compressing the beam angle of the light beams reflected by the second light combining lens 141 and the third mirror 143, so that the spot size is small.
Preferably, a collimating lens (not labeled) is further disposed between the second light combining lens 141 and the color wheel 180, and the collimating lens is configured to further compress the divergence angle of the laser beam incident to the color wheel and collimate the large-angle reflected light beam emitted from the color wheel.
And, preferably, a focusing lens (not shown) may be further disposed between the light emitting position of the color wheel 180 and the light collecting member 160, so as to compress the light beam output by the color wheel, and then the compressed light beam enters the light rod.
In summary, in the color wheel structure in the laser light source provided by the embodiment of the invention, the first color region is symmetrically arranged with respect to the second color region, so that the second color region can be actually divided into two second color regions, and a three-primary-color time sequence is respectively formed with each first color region, and at least one spoke region is reduced. Therefore, when the light spot passes through the color wheel, the light spot only generates a small amount of spoke light while ensuring that the color wheel provides a plurality of time sequence period primary light during one rotation. For example, the color wheel may generate only 4 spoke lights when the plurality of regions of the color wheel are in the arrangement order shown in fig. 3, 4, and 6, and only 5 spoke lights when the plurality of regions of the color wheel are in the arrangement order shown in fig. 5. The reduction of the number of the light in the spoke area can reduce the complexity of the electronic software program for processing the light in the area, for example, if the mixed color section is not abandoned but utilized, the white balance needs to be recalculated and the ratio needs to be recalculated, the rotating position of the color wheel is accurately controlled, the duration of the mixed color section is judged and is beneficial, and the reduction of the number of the light in the spoke area inevitably reduces the complexity of the electronic software control.
And more importantly, when the spoke light is processed in a manner of abandoning the spoke light area, namely the electronic software control can be relatively simple and reliable, the scheme of the spoke light with a small number can reduce the loss of various primary color lights, further reduce the loss of the brightness of the whole projection picture, reduce the influence of the lost primary color lights on the proportion in the primary white balance, and be beneficial to presenting high-quality projection picture display.
Furthermore, by arranging the multi-color-division segments, the color wheel can provide complete light with 3 colors in 2 time sequence periods in one rotation, namely three-color light (namely three-primary-color light components), so that the rotating speed of the color wheel is increased, the time for the color wheel to emit 1 group of complete light with 3 colors is shortened, the probability of rainbow phenomenon can be reduced, and the viewing quality of a projection picture is improved.
As shown in fig. 1, an embodiment of the present invention provides a laser projector, including: a laser light source 10, an optical engine 20 and a projection lens 30, wherein the laser light source 10 is any one of the above laser light sources. The optical engine 20 is located between the laser light source 10 and the projection lens 30. The optical engine 20 is configured to modulate a light beam emitted from the laser light source 10 to generate an image light beam. For example, the optical engine includes a light valve, which may be a digital micro mirror Device (DMD), and the DMD includes a plurality of mirrors, and when the light beam is irradiated to the DMD, the DMD deflects the mirror at a position where the same color appears in an image to be displayed according to the color of the received light beam, so that the light beam is reflected by the deflected mirror to generate an image light beam. The projection lens 30 is used for projecting the image beam onto a projection screen.
Because the arrangement sequence of the areas of the color wheel is different, the sequence of the light beams with different colors emitted by the laser light source is also different. When the light valve is irradiated by the light beam emitted by the laser light source, the light beam is modulated to generate an image light beam according to the arrangement sequence of the plurality of areas in the substrate on the color wheel. For example, it is assumed that the arrangement order of the plurality of regions of the color wheel is the arrangement order shown in fig. 3. If the rotation frequency of the color wheel (which is a general term for the color wheel and the color wheel) is the same as the frequency of the laser projector for displaying images, in the process of one rotation of the color wheel, the light beam emitted by the laser light source sequentially irradiates the light valve according to the sequence of red light, green light, blue light and green light, the light valve can sequentially generate sub-image light beams with corresponding colors according to the sequence of the received red light, green light, blue light and green light, and finally the plurality of sub-image light beams are overlapped to form a complete image light beam. The light valve may also generate a first sub-image beam according to a portion of the received red light, generate a second sub-image beam according to the remaining portion of the received red light, and superimpose the first sub-image beam and the second sub-image beam to form a sub-image beam corresponding to the color. Thus, the flexibility of the light valve to generate the image beam is improved.
In summary, in the laser projector provided in the embodiments of the present invention, due to the color wheel structure of the laser light source in the laser projector, when the light spot passes through the color wheel, it is ensured that a plurality of time-sequence period primary color lights are provided while the color wheel rotates for one circle, and only a small number of spoke lights are generated. The reduction of the number of the light in the spoke area can reduce the complexity of the electronic software program for processing the light in the area, for example, if the mixed color section is not abandoned but utilized, the white balance needs to be recalculated and the ratio needs to be recalculated, the rotating position of the color wheel is accurately controlled, the duration of the mixed color section is judged and is beneficial, and the reduction of the number of the light in the spoke area inevitably reduces the complexity of the electronic software control.
And more importantly, when the spoke light is processed in a manner of abandoning the spoke light area, namely the electronic software control can be relatively simple and reliable, the scheme of the spoke light with a small number can reduce the loss of various primary color lights, further reduce the loss of the brightness of the whole projection picture, reduce the influence of the lost primary color lights on the proportion in the primary white balance, and be beneficial to presenting high-quality projection picture display.
As described above, when the arrangement sequence of the plurality of regions of the color wheel is as shown in fig. 3, the sequence of the sub-image light beams generated by the optical engine is the sub-image light beam corresponding to red, the sub-image light beam corresponding to green, the sub-image light beam corresponding to blue, and the sub-image light beam corresponding to green; when the arrangement sequence of the plurality of regions of the color wheel is as shown in fig. 4, the sequence of the sub-image light beams generated by the optical machine is the sub-image light beam corresponding to blue, the sub-image light beam corresponding to red, the sub-image light beam corresponding to green and the sub-image light beam corresponding to red; when the arrangement sequence of the plurality of regions of the color wheel is as shown in fig. 5, the sequence of the sub-image light beams generated by the optical machine is the sub-image light beam corresponding to green, the sub-image light beam corresponding to red, the sub-image light beam corresponding to green, the sub-image light beam corresponding to red and the sub-image light beam corresponding to blue; when the arrangement sequence of the plurality of regions of the color wheel is as shown in fig. 6, the sequence of the sub-image light beams generated by the optical engine is the sub-image light beam corresponding to blue, the sub-image light beam corresponding to red, the sub-image light beam corresponding to blue, and the sub-image light beam corresponding to green. Therefore, due to the fact that the arrangement sequence of the areas of the color wheel is different, the sequence of the light beams with different colors emitted by the laser light source is different, the sequence of the sub-image light beams generated by the optical machine is different, and the flexibility of generating the image light beams by the optical machine is improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (11)
1. A laser light source, comprising:
a blue laser emitting blue laser light;
a color wheel comprising a plurality of regions arranged along a first circumferential direction, wherein the plurality of regions arranged along the first circumferential direction comprise at least one pair of first regions emitting light with the same color, a second region is arranged between each pair of first regions, and the colors of the light emitted by the first regions and the second regions are different;
at least one of the first region and the second region is a fluorescent region;
the color wheel also comprises a plurality of areas which are arranged along the second circumferential direction, and the plurality of areas which are arranged along the second circumferential direction comprise filter areas which are arranged corresponding to the first area and the second area;
the color wheel outputs three primary color lights in sequence, and the three primary color lights are red light, blue light and green light.
2. The laser light source of claim 1, wherein the first circumferential direction and the second circumferential direction are aligned in a radial direction of the color wheel.
3. The laser light source of claim 2, wherein the first circumferential direction is located outside the color wheel and the second circumferential direction is located inside the color wheel.
4. The laser light source according to claim 1, wherein the plurality of regions arranged in the first circumferential direction and the plurality of regions arranged in the second circumferential direction are provided on the same substrate, and the substrate is a metal substrate.
5. The laser light source according to claim 4, wherein the plurality of regions arranged in the first circumferential direction further include a laser light scattering region including a scattering layer coated on the metal substrate; correspondingly, the plurality of regions arranged along the second circumferential direction further include a transmissive region for transmitting the laser light emitted from the laser light scattering region.
6. The laser light source according to claim 1,
the plurality of areas arranged along the first circumferential direction comprise two green fluorescent areas, two yellow fluorescent areas and a laser scattering area, the first area is a first green fluorescent area, the second area is a yellow fluorescent area, or the first area is a second yellow fluorescent area, and the second area is a green fluorescent area;
correspondingly, the plurality of regions arranged along the second circumferential direction include two green filter regions, two red filter regions and one transmission region.
7. The laser light source according to claim 6,
the ratio of the angle of the circle center of the yellow fluorescent region is equal to that of the angle of the circle center of the red filter region;
the ratio of the circle center angle of the green fluorescent region is equal to that of the circle center angle of the green filter region;
the ratio of the circle center angle of the laser scattering area to the circle center angle of the transmission area is equal.
8. The laser light source according to claim 6, wherein a central angle of a sector where the fluorescent regions are located in the plurality of regions arranged in the first circumferential direction and a central angle of the filter region correspondingly disposed in the plurality of regions arranged in the second circumferential direction are opposite angles;
and the central angle of the fan shape of the laser scattering area in the plurality of areas arranged along the first circumferential direction and the central angle of the transmission area correspondingly arranged in the plurality of areas arranged along the second circumferential direction are opposite angles.
9. The laser light source of claim 1, further comprising:
the multiple groups of lasers combine light through the first light combining mirror, and the light beams after light combination are homogenized through the fly eye lens.
10. The laser light source according to claim 1 or 9, further comprising: a second light combining lens, configured to transmit the blue laser, where the blue laser is incident on a plurality of areas of the color wheel arranged along a first circumferential direction after being transmitted,
the fluorescence areas in the multiple areas arranged along the first circumferential direction are excited to generate fluorescence, and the fluorescence is reflected and then enters the second light combining lens and is reflected to the fourth reflecting lens by the second light combining lens;
the laser scattering areas in the multiple areas arranged along the first circumferential direction scatter the laser, and the laser is reflected to the second light combining lens and is transmitted to a third reflecting lens through the second light combining lens;
the fourth reflector reflects the fluorescence to a filter area in the plurality of areas arranged along the second circumferential direction;
and the third reflector reflects the laser to the fourth reflector, and the fourth reflector reflects the laser to a transmission area in a plurality of areas arrayed along a second circumferential direction.
11. A laser projector, characterized in that the laser projector comprises:
an optical machine, a projection lens and a laser light source, wherein the laser light source is the laser light source of any one of claims 1 to 10;
the optical machine is used for modulating the light beam to generate an image light beam when being irradiated by the light beam emitted by the laser light source;
the projection lens is used for projecting the image light beam to a projection screen.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811557926.5A CN111338166A (en) | 2018-12-19 | 2018-12-19 | Laser light source and laser projector |
| PCT/CN2019/104630 WO2020125070A1 (en) | 2018-12-19 | 2019-09-06 | Laser light source and laser projector |
| US16/586,285 US20200201153A1 (en) | 2018-12-19 | 2019-09-27 | Laser light source and laser projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811557926.5A CN111338166A (en) | 2018-12-19 | 2018-12-19 | Laser light source and laser projector |
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| CN111338166A true CN111338166A (en) | 2020-06-26 |
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| CN201811557926.5A Withdrawn CN111338166A (en) | 2018-12-19 | 2018-12-19 | Laser light source and laser projector |
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| WO2023011026A1 (en) * | 2021-08-04 | 2023-02-09 | Oppo广东移动通信有限公司 | Projection method and apparatus, and system and non-volatile computer-readable storage medium |
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