Illuminating system and illuminating equipment

Abstract

The invention relates to the technical field of display, and discloses a lighting system and lighting equipment, and the lighting system, light splitting of first primary light is realized through a light adjusting device and a light splitting and combining element of a partition, one part is used as exciting light, and the other part is used as emergent light of the lighting system; meanwhile, the light adjusting device can recycle part of excited light and re-excite residual exciting light; therefore, the lighting system is simple in structure and small in size, and meanwhile the light utilization rate of the lighting system and the brightness of the lighting equipment are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of projection display technology, in particular to an illumination system and an illumination device. BACKGROUND

[0002] In a projection display product, the illumination system is a very important component, and its function is to convert light rays of different colors, different angular distributions, different brightnesses and different shapes into uniform light spots irradiated to the effective area of the display chip.

[0003] In the field of projection display, traditional bulbs are less and less used due to their own defects, and new light sources such as LEDs, phosphor and lasers have excellent characteristics in brightness, color, life and energy consumption, and gradually become the mainstream of light sources for projection display. However, laser light sources have speckle problems, so it is necessary to mix wide-spectrum fluorescent light to dissipate and weaken the color edge ghosting phenomenon. At present, blue laser technology is mature, the conversion efficiency is high, and the cost is relatively low compared with green and red lasers; there are various configurations of blue lasers, such as 4, 5, 8, 10, 14, 20 and other configurations. Therefore, how to fully utilize blue laser is a problem to be solved. SUMMARY

[0004] The present application provides an illumination system which can be used in an illumination device. The illumination system has a simple structure, a small volume, and improved light utilization of the illumination system and brightness of the illumination device.

[0005] In a first aspect, the present application provides an illumination system, comprising:

[0006] a light source configured to emit first primary color light and second primary color light;

[0007] a light splitting and combining element configured to guide the excited light and the second primary color light to a light homogenizing element; the light splitting and combining element comprises a target region configured to split the incident first primary color light into a first light beam and a second light beam, the first light beam being incident on the first adjusting element, and the second light beam being incident on the light homogenizing element; and a remaining region configured to guide the incident first primary color light to the light homogenizing element, and guide the first light beam incident from the first adjusting element to a wavelength conversion device; a center point of the target region and a light spot center of the first light beam incident on the remaining region from the first adjusting element are separated by a target distance;

[0008] a light adjusting device comprising a first adjusting element configured to reflect the first light beam back to the light splitting and combining element; wherein the incident light ray when the first light beam is incident is parallel to the emergent light ray when the first light beam is emitted, and the sum of the incident angle when the first light beam is incident and the emergent angle when the first light beam is emitted is 90 degrees, or the incident angle when the first light beam is incident is equal to the emergent angle when the first light beam is emitted;

[0009] The wavelength conversion device is used for emitting stimulated light by the first light beam, and the second primary color light and the stimulated light have overlapping wavelength bands.

[0010] The light homogenizing element is used for homogenizing the first primary color light, the second primary color light and the stimulated light entering the light homogenizing element to be emitted as the exit light of the illumination system.

[0011] In some embodiments, the light adjusting device further comprises a second adjusting element, and the wavelength conversion device emits the stimulated light and the residual excitation light;

[0012] The residual excitation light enters the second adjusting element through the light splitting and light combining element, is reflected back to the light splitting and light combining element by the second adjusting element, and is re-excited by the wavelength conversion device through the light splitting and light combining element.

[0013] In some embodiments,

[0014] The first adjusting element and the second adjusting element are independent elements, and the angle between the second adjusting element and the light splitting and light combining element is a second angle, and the residual excitation light is vertically incident on the second adjusting element and is reflected back to the light splitting and light combining element by the second adjusting element.

[0015] Alternatively, the first adjusting element and the second adjusting element are integrated, and the second adjusting element is located at one end or both ends of the first adjusting element.

[0016] Alternatively, the second adjusting element is parallel to the light splitting and light combining element.

[0017] In some embodiments, the second primary color light and the stimulated light have overlapping wavelength bands.

[0018] The stimulated light passes through the light splitting and light combining element, and part of the stimulated light enters the first adjusting element, and the part of the stimulated light is the light whose wavelength band overlaps with the wavelength band of the second primary color light and whose polarization state is the same as that of the stimulated light.

[0019] The first adjusting element reflects the part of the stimulated light back to the light splitting and light combining element, and the part of the stimulated light enters the wavelength conversion device through the light splitting and light combining element.

[0020] The first stimulated light and the second stimulated light are emitted after conversion by the wavelength conversion device, the polarization state of the second stimulated light is the same as that of the part of the stimulated light, and the polarization state of the first stimulated light is different from that of the second stimulated light; the first stimulated light enters the light homogenizing element through the light splitting and light combining element to be homogenized; and the second stimulated light enters the first adjusting element through the light splitting and light combining element, and the cycle is repeated.

[0021] In some embodiments, the light adjusting device comprises a driving device corresponding to the first adjusting element.

[0022] The driving device drives the first adjusting element to perform periodic reciprocating motion, and there is an optical path difference between light injected into the first adjusting element at a current moment and light injected into the first adjusting element at a previous moment, and the first adjusting element is at different positions in the optical path at the current moment and the previous moment; and / or, the movement direction of the first adjusting element is parallel or perpendicular to the optical axis when the light source light is incident or when the light source light is emitted.

[0023] Alternatively, the driving device drives the first adjusting element to perform rotation.

[0024] In some embodiments, the first adjusting element includes at least three reflecting surfaces or two reflecting surfaces, the reflecting surfaces are arranged perpendicular to each other, and the incident light ray of the light injected into the first adjusting element is parallel to the emitted light ray after the light is reflected by the three reflecting surfaces or the two reflecting surfaces.

[0025] In some embodiments, the first adjusting element includes two reflecting surfaces, the included angle between the two reflecting surfaces is kept unchanged, and the optical axes of the two reflecting surfaces are adjusted so that the incident light ray of the light injected into the first adjusting element is parallel to the emitted light ray.

[0026] In some embodiments,

[0027] The optical axis of the first light beam emitted from the first adjusting element is parallel to the normal line of the wavelength conversion device.

[0028] And / or, the optical axis of the residual excitation light injected into the second adjusting element is parallel to the optical axis of the first light beam emitted from the first adjusting element.

[0029] And / or, the incident point of the residual excitation light injected into the light-splitting and light-combining element and the emitted point of the first light beam emitted from the light-splitting and light-combining element are on a straight line with the center point of the light-splitting and light-combining element.

[0030] In some embodiments,

[0031] The target region is the middle region of the light-splitting and light-combining element.

[0032] And / or, the size of the target region is 50% to 30% of the spot size of the first primary color light on the light-splitting and light-combining element.

[0033] And / or, the ratio of the luminous flux of the first light beam to the luminous flux of the second light beam is a first ratio.

[0034] In some embodiments, a speckle suppression element is arranged between the first adjusting element and the light-splitting and light-combining element, and the first light beam emitted from the first adjusting element is injected into the light-splitting and light-combining element after speckle suppression by the speckle suppression element.

[0035] Secondly, this application provides a lighting device, including the lighting system described in any one of the first aspects and possible implementations of the first aspect.

[0036] The lighting system provided in this application achieves the splitting of the first primary color light through a light adjustment device and a partitioned light splitting and combining element, so that a part is used as excitation light and the other part is used as the output light of the lighting system; at the same time, the light adjustment device can also realize the recovery of part of the excited light and the re-excitation of the residual excitation light; therefore, the lighting system has a simple structure and small size, while improving the light utilization rate of the lighting system and the brightness of the lighting equipment. Attached Figure Description

[0037] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps. Wherein:

[0038] Figure 1 This is a schematic diagram of the lighting system in one embodiment of this application;

[0039] Figure 2 This is a schematic diagram of the lighting system in another embodiment of this application;

[0040] Figure 3 This is a schematic diagram of the lighting system in another embodiment of this application;

[0041] Figure 4 This is a schematic diagram of the lighting system in another embodiment of this application;

[0042] Figure 5 This is a schematic diagram of the structure of a lighting device in one embodiment of this application. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application. Furthermore, although the disclosure in this application is introduced according to one or several exemplary examples, it should be understood that each aspect of these disclosures can also constitute a complete technical solution on its own. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] In the embodiments of this application, words such as "exemplarily" and "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as an "example" in this application should not be construed as being better or more advantageous than other embodiments or designs. Rather, the use of the word "example" is intended to present the concept in a specific manner.

[0045] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “first,” “second,” and similar terms used in this application do not indicate any order, quantity, or importance, but are used solely for distinguishing descriptions. Terms such as “comprising” or “including” mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. The term “and / or” includes any and all combinations of one or more associated listed items.

[0046] To fully understand this application, a detailed description is provided below to illustrate the technical solutions of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0047] This embodiment provides a lighting system, which includes a light source 10, a light-splitting and light-combining element 20, a light-adjusting device 30, a wavelength conversion device 40, and a light-uniforming element 50; wherein:

[0048] Light source 10 is used to emit the first primary color light and the second primary color light.

[0049] Optionally, the first and second primary color lights emitted by the light source 10 are not limited, and the first or second primary color light can be any one of red, green, or blue light. The light source 10 is not limited and can be an LED, a laser LD, or other novel light sources, or a hybrid light source of LED and laser LD, etc. For example, the light source 10 may include a blue laser light source, with the first primary color light being a blue laser, and the wavelength range of the blue laser is not limited; for example, the dominant wavelength of the blue laser may be 465nm or 455nm. The light source 10 may also include at least one of a red laser light source and a green laser light source, and the second primary color light can be a red laser and / or a green laser. The number of light-emitting chips in each laser light source is not limited; it can be a single light-emitting chip or an array of light-emitting chips. Optionally, the polarization state of the laser light emitted by each laser light source is not limited and can be either P-state or S-state.

[0050] Optionally, when the light source 10 includes a first laser light source 1 and a second laser light source 2, and the first laser light source and / or the second laser light source includes a light-emitting chip with 4 red lasers (red laser light source), a light-emitting chip with 3 green lasers (green laser light source), and a light-emitting chip with 2 blue lasers (blue laser light source), the power supply current of the first laser light source and / or the second laser light source is between 6A and 8A. The first laser light source and the second laser light source overcome the limitation of power supply current, ensuring sufficient blue light in the lighting system and achieving a better light combining ratio.

[0051] Optionally, polarization conversion elements can be set on the light-emitting side of each color laser source to change the polarization state of each color laser to meet the needs of subsequent optical paths. The polarization conversion elements can be half-wave plates, quarter-wave plates, etc.

[0052] Optionally, the light source 10 emits red laser light. The light source 10 includes a first laser source and a second laser source, which are independent of each other, as well as a light guide assembly. The first laser source and the second laser source are arranged opposite each other. The light guide assembly may include, but is not limited to, reflective elements, dichroic elements, etc. The first spot of the red laser light emitted from the first laser source and the second spot of the red laser light emitted from the second laser source are guided by the light guide assembly to form side-by-side spots. In the side-by-side spots, the major axis of the first spot is parallel to the major axis of the second spot, and the minor axis of the first spot is on the same straight line as the minor axis of the second spot. Therefore, the side-by-side spots can be relatively small, reducing the size of subsequent components and thus reducing the volume of the lighting system.

[0053] The long sides of both the first and second laser light sources are parallel to the optical axis of the laser beam emitted from the light source 10. Both the first and second laser light sources have at least two rows of light-emitting chips arranged in a first direction. Each row of light-emitting chips has multiple chips arranged along a second direction. The long side of the side-by-side light spots of the laser beams is related to the length of each row of light-emitting chips in the second direction. The first direction corresponds to the long sides of the first and second laser light sources, and the second direction corresponds to the short sides of the first and second laser light sources. In this embodiment, the distance between the laser beams emitted from the first and second laser light sources can reach 3mm or 2mm, or even less. By adjusting the positions of the light-emitting chips, the distance between the laser beam spots is further shortened, improving the utilization rate of the laser in the lighting system and reducing the size of the lighting system.

[0054] Optionally, the first laser source and the second laser source emit blue laser, red laser, and green laser. The distance between the position emitting the red laser from the first laser source and / or the second laser source and the light-emitting side of the light source 10 is shorter than the distance between the positions emitting the blue laser and the light-emitting side of the green laser. The red laser has a larger divergence angle, and being closer to the light-emitting side can reduce the size of the lighting system.

[0055] Optionally, the light source 10 can be equipped with a speckle suppression element, which can be a diffuser, diffuser wheel, compound eye, dynamic dissipation element (LSR), etc. The speckle suppression element can homogenize the laser, thereby making the light spot distribution into the homogenizing element more uniform, thus improving the speckle problem.

[0056] Optionally, the light source 10 also includes a third laser source, which emits blue laser light. The light guide assembly is used to combine the blue laser light emitted by the third laser source with the blue laser light emitted by the first and second laser sources. The light guide assembly also includes a reflective element, which can be replaced with a dichroic element to transmit blue laser light and reflect red / green laser light; alternatively, the third laser source is located between the first and second laser sources, passing through the middle of the reflective element and combining with the blue laser light emitted by the first and second laser sources. Optionally, a polarization conversion element can also be provided on the emitting side of the third laser source to convert the polarization state of the blue laser light to meet the requirements of subsequent optical paths. By adding a blue laser source, the heat dissipation pressure of the first and second laser sources can be reduced, while the brightness of the lighting equipment can be improved.

[0057] Optionally, the first, second, and third laser light sources are arranged side-by-side on one side of the beam splitter and combiner. This allows for better heat dissipation, stabilizes the emitted light from the lighting system, and improves image quality. It also allows for a higher supply voltage to the light-emitting chip, thereby increasing the brightness of the lighting device. Optionally, to ensure that the laser emitted from the light source 10 enters the beam splitter and combiner more uniformly, reflective elements and shaping lens groups can be provided on the light-emitting side. It should be noted that the shaping lens group mentioned in this application may include one or more lenses, which can be spherical or aspherical lenses, and their curvature parameters can be customized according to the actual application.

[0058] Optionally, when the light source includes a red laser source, a green laser source, and a blue laser source, it also includes a light guide assembly. The light guide assembly includes a first dichroic element, a second dichroic element, a first reflective element, and a second reflective element. The green laser emitted from the green laser source and the blue laser emitted from the blue laser source enter the first dichroic element. The blue laser is transmitted through the first dichroic element to the first reflective element, reflected by the first reflective element to the second reflective element, reflected by the second reflective element back to the first dichroic element, and then transmitted again through the dichroic element to the second dichroic element. The green laser is reflected by the first dichroic element to the second dichroic element and then transmitted through the second dichroic element. The red laser emitted from the red laser source is reflected by the second dichroic element. Therefore, the three-color lasers can achieve good coaxiality, and the blue laser becomes coaxial after passing through the reflective element once, which can make the light source smaller and increase the degree of freedom in setting the subsequent optical path space.

[0059] Optionally, the light source includes only a blue laser source, with blue laser as the primary color light. The blue laser light incident on the target area is partially transmitted and partially reflected; the transmitted portion becomes the second beam, and the reflected portion becomes the first beam. In the beam splitter / combiner, the remaining areas excluding the target area transmit the incident blue laser light to the homogenizing element. After the first beam enters the light adjustment device, it is then reflected parallel back to the remaining areas of the beam splitter / combiner, and transmitted through these remaining areas to the wavelength conversion device. The conversion region of the wavelength conversion device is excited to emit stimulated light, which is reflected by the beam splitter / combiner to the homogenizing element.

[0060] The light splitting and combining element 20 is used to guide the excited light and the second primary color light to the light homogenizing element; it includes a target area for splitting the incident first primary color light into a first beam and a second beam, the first beam being incident into a first adjustment element and the second beam being incident into the light homogenizing element; the remaining area is used to guide the incident first primary color light to the light homogenizing element and to guide the first beam incident from the first adjustment element to the wavelength conversion device.

[0061] Optionally, the center point of the target area is at a target distance from the center of the spot of the first beam incident from the first adjustment element onto the remaining area. The target distance is not limited and can be customized according to the actual application; for example, the target distance can be in the range of 5–15 mm, such as 10 mm. The center point of the target area does not overlap with the center of the spot of the first beam incident from the first adjustment element onto the remaining area; the center of the spot of the first primary color light incident on the beam splitter / combiner does not overlap with the center of the spot of the first beam incident from the first adjustment element onto the remaining area; the center of the target area, the center of the spot of the first beam incident from the first adjustment element onto the remaining area, and the center of the spot of the first primary color light incident on the beam splitter / combiner are on a straight line.

[0062] For example, such as Figure 1 As shown, the second primary color light emitted from the light source 10 is transmitted to the light homogenizing element 50 through the light splitting and combining element 20, and the second primary color light is transmitted to all areas of the light splitting and combining element 20. Figure 1 The gray-filled area of ​​the light-splitting and combining element 20 is the target area. The first primary color light incident on the target area is partially transmitted and partially reflected; the transmitted portion becomes the second beam, and the reflected portion becomes the first beam. In the remaining areas of the light-splitting and combining element 20, excluding the target area, when the first primary color light is incident, it is transmitted to the uniform light element 50. After the first beam enters the light adjustment device 30, it is then reflected parallel back to the remaining areas of the light-splitting and combining element, and transmitted through these remaining areas to the wavelength conversion device. Figure 1 The lines with arrows indicate the direction of the light beam path. The solid line b represents the first primary color light, the solid line b1 represents the first beam, the solid line b2 represents the second beam, and the remaining solid lines represent residual excitation light. The single-dot dashed line represents red laser light, and the double-dot dashed line represents green light (green laser and green fluorescence). It should be understood that this is only a schematic diagram and does not limit the optical axis, spot size, etc. of the actual light beam.

[0063] Optionally, the size of the target area is 50% to 30% of the spot size of the first primary color light on the light-splitting and combining element, for example, it can be 35%, 40%, 45%, etc.

[0064] Optionally, the ratio of the luminous flux of the first beam to that of the second beam is a first ratio; the first ratio is not limited and can be customized according to actual application conditions, such as 1:1, 2:1, 3:1, etc. Optionally, the first ratio is related to the size of the target area and the transmittance-reflectance ratio of the target area to the first primary color light, where transmittance-reflectance ratio refers to the ratio of the transmittance to the reflectance of the target area to the first primary color light. By dividing the first primary color light into sections, a portion of the first primary color light can be used as excitation light, while the other portion is used as output light, which can improve the utilization rate of the light emitted by the light source and reduce the size of the illumination system. In addition, the target area partially reflects and partially transmits the first primary color light without affecting the uniformity of the output light. At the same time, the proportion of blue light component in the output light can be adjusted by adjusting the first ratio, thereby adjusting the white balance and color temperature.

[0065] Optionally, the target region is the central region of the beam splitter / combiner. Since the energy of the beam gradually decreases from the center outwards, placing the target region in the center can make the emitted light spot more uniform.

[0066] The light adjustment device 30 includes a first adjustment element for reflecting the first light beam back to the light splitting and combining element; wherein the incident ray when the first light beam enters is parallel to the outgoing ray when it exits, and the sum of the incident angle when the first light beam enters and the outgoing angle when it exits is 90 degrees or the incident angle when the first light beam enters and the outgoing angle when it exits are equal.

[0067] In some embodiments, the light adjustment device includes a driving device corresponding to the first adjustment element, the driving device driving the first adjustment element to perform periodic reciprocating motion, there is an optical path difference between the light incident on the first adjustment element at the current moment and the light incident on the first adjustment element at the previous moment, and the first adjustment element is at different positions in the optical path at the current moment and the previous moment.

[0068] Optionally, the direction of movement of the first adjusting element is parallel or perpendicular to the optical axis of the light source when it is incident or when it is emitted. For example... Figure 2 As shown, the direction of movement of the first adjustment element is parallel to the optical axis when the light source is incident or when it is emitted. The dashed line 30 represents the position of the first adjustment element in the optical path at the previous moment, and the solid line 30 represents the position of the first adjustment element in the optical path at the current moment. The periodic reciprocating motion of the first adjustment element can suppress speckle on the incident light, thereby making the light entering the wavelength conversion device more uniform and improving the wavelength conversion efficiency. Alternatively, the driving device can drive the first adjustment element to rotate, which can reduce the instantaneous optical power on the wavelength conversion device and improve the conversion efficiency.

[0069] Optionally, the first adjusting element includes at least three or two reflecting surfaces, which are arranged perpendicularly to each other. Light incident on the first adjusting element is reflected by the three or two reflecting surfaces, making the incident light parallel to the outgoing light. For example, the first adjusting element can be a triangular pyramid, or it can be... Figure 1 The image shown consists of two reflective elements with a certain angle between them.

[0070] Optionally, the first adjustment element includes two reflective surfaces. The angle between the two reflective surfaces is kept constant at a first angle. The optical axes of the two reflective surfaces are adjusted so that the incident light ray entering the first adjustment element is parallel to the outgoing light ray. The first angle can be customized according to the actual application, for example, it can be 90 degrees. By rotating the first adjustment element, as long as the two reflective surfaces remain at 90 degrees, the sum of the incident angle and the outgoing angle of the first beam is 90 degrees, thus making the incident light ray and the outgoing light ray parallel. This allows the first beam to enter the wavelength conversion device through the remaining area of ​​the beam splitter / combiner element; this structure is simple and can make the lighting system smaller.

[0071] Optionally, the optical axis of the first beam emitted from the first adjustment element is parallel to the normal of the wavelength conversion device; alternatively, the optical axis of the first beam emitted from the first adjustment element is parallel to the optical axis of the excited light emitted from the wavelength conversion device; that is, the first beam strikes the wavelength conversion device at an angle, thereby facilitating the re-excitation of the subsequent residual excitation light and the recovery of the portion of the excited light that was not emitted as light from the illumination system.

[0072] In some embodiments, a speckle suppression element is disposed between the first adjustment element and the beam splitter / combiner element. The first beam emitted from the first adjustment element is speckle suppressed by the speckle suppression element before entering the beam splitter / combiner element. Figure 4 As shown, a speckle suppression element 33 is provided between the first adjustment element 30 and the beam splitting and combining element 20; the first beam is uniformly incident into the wavelength conversion device, which can improve the excitation efficiency.

[0073] In some embodiments, the light adjustment device further includes a second adjustment element. When the wavelength conversion device emits excited light, it also emits residual excitation light. The residual excitation light is incident on the second adjustment element via a beam splitter and combiner, reflected back to the beam splitter and combiner, and then incident on the wavelength conversion device for re-excitation. The return of the residual excitation light to the wavelength conversion device for re-excitation can improve the utilization rate of the excitation light, thereby increasing the brightness of the lighting equipment.

[0074] Optionally, the first adjusting element and the second adjusting element are integrated into one unit, with the second adjusting element located at one or both ends of the first adjusting element, for example, as shown in the figure. Figure 1As shown, the second adjustment element, represented by parts 320 and 321, is located at both ends of the first adjustment element, causing the residual excitation light to enter the wavelength conversion device in a direction parallel to the first beam for re-excitation.

[0075] Optionally, the first adjustment element and the second adjustment element are independent components. The angle between the second adjustment element and the beam splitter / combiner is the second angle. The residual excitation light is perpendicularly incident on the second adjustment element and reflected back to the beam splitter / combiner. The second angle can be customized according to the actual application, for example, it can be 45 degrees. Figure 3 As shown, the first adjustment element 31 and the second adjustment element 32 are independent of each other. Since the optical path is reversible, the residual excitation light returns to the wavelength conversion device for re-excitation.

[0076] Optionally, the second adjustment element is parallel to the beam splitter and combiner. That is, the second adjustment element can also be independent of the first adjustment element and parallel to the beam splitter and combiner. The second adjustment element reflects the residual excitation light to the end of the first adjustment element that is far from the second adjustment element, so that the residual excitation light enters the wavelength conversion device through the remaining area for re-excitation.

[0077] Optionally, the optical axis of the residual excitation light entering the second adjustment element is parallel to the optical axis of the first beam emitted from the first adjustment element. Optionally, the incident point of the residual excitation light entering the beam splitter / combiner and the exit point of the first beam exiting the beam splitter / combiner are on a straight line with the center point of the beam splitter / combiner. That is, when the first beam enters the wavelength conversion device at an angle, the residual excitation light may converge and exit at a position symmetrical to the normal of the wavelength conversion device relative to the first beam; therefore, it is necessary to set the second adjustment element at an appropriate position to return the residual excitation light to the wavelength conversion device as much as possible, thereby improving the light utilization rate.

[0078] Wavelength conversion device 40 is used to be excited by the first beam to emit stimulated light, and the second primary color light has the same wavelength band as the stimulated light.

[0079] In some embodiments, the wavelength conversion device includes at least one conversion region, the conversion region of the wavelength conversion device includes an anti-reflection layer, a wavelength conversion layer and a reflective layer; a first light beam passes through the anti-reflection layer and then enters the wavelength conversion layer, the wavelength conversion layer is excited by the first light beam to generate excited light, and the excited light is reflected by the reflective layer and then emitted.

[0080] Optionally, the reflective layer can be a reflective film deposited on a heat dissipation substrate, such as printing a diffuse reflective white layer on the heat dissipation substrate. The white layer reflects blue light and fluorescence, and is composed of a mixture of adhesive and nano-reflective powder. The adhesive can be organic or inorganic, and the nano-reflective powder is composed of nano-TiO2, Al2O3, MgO, etc. Alternatively, the heat dissipation substrate can be polished, such as a polished aluminum substrate. The thickness of the heat dissipation substrate is approximately 0.5 mm. The energy of the first light beam incident from the antireflection layer to the wavelength conversion layer accounts for more than 90% of the total energy, preferably more than 98%. The reflective layer can diffusely reflect the incident light, allowing the first light beam to return to the wavelength conversion layer for excitation, thereby improving the excitation efficiency.

[0081] Optionally, the wavelength conversion layer contains a wavelength conversion material, which can be a phosphor or a phosphite. For example, it can be a yellow phosphor that emits yellow light upon excitation, such as a yttrium aluminum garnet (YAG) phosphor containing cerium (Ce) as an activator, or it can be a green phosphor, red phosphor, yellow phosphor, orange phosphor, citron phosphor, cyan phosphor, etc. Optionally, the conversion region can include a first region and a second region, each region corresponding to a wavelength conversion material, capable of producing at least one color of light with a wavelength different from that of the first beam; that is, the excited light can be at least one of yellow, red, green, orange, citron, or cyan fluorescence. For example, the wavelength conversion layer of the first region (region G) is composed of a mixture of green or cyan phosphor and an organic adhesive, which is excited to produce green or cyan fluorescence; the green phosphor is an aluminate, silicate, or β-thionyl green phosphor, and the organic adhesive is high-temperature silicone or epoxy adhesive. The wavelength conversion layer of the second region (R region) is made of yellow, orange, or red phosphor mixed with organic adhesive, which is excited to produce yellow, red, orange, or yellow fluorescence; the red phosphor is nitride, silicate, or α-thionyl red phosphor, the orange phosphor is a mixture of yellow and red phosphor, or silicate orange phosphor, and the organic adhesive is high-temperature silicone or epoxy adhesive.

[0082] Optionally, the antireflection layer is a glass, sapphire, or silicon carbide coated antireflection film, or a nano-SiO2 film, or a beam splitter. Optionally, the antireflection film is deposited on the outer surface of the sapphire, and the inner surface is bonded to the wavelength conversion layer; the thickness is 0.2mm to 1mm, preferably 0.4mm; if the blue laser directly irradiates the sapphire, the sapphire has good temperature resistance, and the first beam passes through the sapphire before entering the wavelength conversion layer, which can improve the radiation power density resistance of the wavelength conversion layer. The antireflection layer enhances the transmission of blue light, and the refractive index difference between the antireflection layer and the wavelength conversion layer is less than a preset threshold. The preset threshold can be customized according to the actual application, for example, 0-0.5, preferably 0-0.2, such as when the refractive indices of the antireflection layer and the wavelength conversion layer are both 1.5-1.7. The proportion of excited light in the light incident from the fluorescent layer to the antireflection layer is greater than a preset proportion threshold; the preset proportion threshold is not limited, for example, it can be 97%. Therefore, when blue light enters the wavelength conversion layer, the amount of reflected blue light can be reduced, thereby reducing the proportion of blue light in the light emitted by the wavelength conversion device, i.e., reducing residual blue light, which can improve the color gamut of the projection device.

[0083] Optionally, each conversion region of the wavelength conversion device corresponds to a type of stimulated light, and a filter element is provided on the light-emitting side of each conversion region to filter the corresponding stimulated light. The filter element can be a filter sheet or a film layer deposited on the light-emitting surface of the wavelength conversion device, such as a film deposited on an antireflection layer. Assuming the device includes a first region and a second region, where the first region generates green fluorescence and the second region emits red fluorescence, the filter element on the light-emitting side of the first region filters the green fluorescence, and the filter element on the light-emitting side of the second region filters the red fluorescence. Optionally, the transmittance of light transmitted through the antireflection layer is greater than 98%, the transmittance of light reflected from the antireflection layer is less than 2%, and the transmittance of light partially transmitted and partially reflected from the antireflection layer is 50%.

[0084] For example, in the first region, light transmission in the 400nm-561nm wavelength band has a transmittance T greater than 98%; light in the 595nm±4nm wavelength band is partially transmitted and partially reflected, with a transmittance T of 50%; light reflection in the 615nm-700nm wavelength band has a transmittance T less than 2%. In the second region, light transmission in the 400nm-465nm wavelength band has a transmittance T greater than 98%; light in the 470nm±4nm wavelength band is partially transmitted and partially reflected, with a transmittance T of 50%; light reflection in the 489nm-592nm wavelength band has a transmittance T less than 2%; and light transmission in the 616nm-693nm wavelength band has a transmittance T greater than 98%. That is, the first antireflection layer can transmit blue and green light (short wavelength) and reflect red light (long wavelength), while the second antireflection layer can transmit blue light and red light and reflect green light. The antireflection layer and the filter layer coated on it can transmit blue light and desired fluorescence while reflecting unwanted fluorescence, thus improving the color gamut.

[0085] In some embodiments, the second primary color light and the stimulated light have overlapping wavelengths. After passing through a beam splitter and combiner, a portion of the stimulated light is incident on a first adjustment element. This portion of the stimulated light consists of light whose wavelength overlaps with that of the second primary color light and has the same polarization state. The first adjustment element reflects a portion of the stimulated light back to the beam splitter and combiner, which then enters a wavelength conversion device. After conversion by the wavelength conversion device, a first stimulated light and a second stimulated light are emitted. The polarization state of the second stimulated light is the same as that of the portion of the stimulated light, while the polarization states of the first stimulated light and the second stimulated light are different. The first stimulated light passes through the beam splitter and combiner and enters a homogenizing element for homogenization. The second stimulated light passes through the beam splitter and combiner and enters the first adjustment element, and this cycle repeats. By recovering the portion of the stimulated light in the overlapping wavelength range during the beam splitter and combiner process, the light utilization rate of the lighting system can be improved, thereby increasing the brightness of the lighting equipment.

[0086] Optionally, some of the stimulated light entering the wavelength conversion device can undergo diffuse reflection, thereby changing the polarization state of a portion of the stimulated light. For example, the conversion region of the wavelength conversion device includes phosphor, and the surface of the phosphor is composed of rough particles. When some of the stimulated light enters the phosphor surface, diffuse reflection occurs, thereby changing the polarization state of a portion of the stimulated light.

[0087] In some embodiments, the light splitter / combiner element can transmit blue light of the first wavelength band, green light of the first polarization state of the second wavelength band, red light of the third wavelength band, or red light of the first polarization state of the third wavelength band, and reflect green light of the second polarization state of the second wavelength band and / or red light of the second polarization state of the third wavelength band, and light of other wavelength bands; the light of the second polarization state of the second wavelength band and / or the light of the second polarization state of the third wavelength band in the excited light, and light of other wavelength bands, after being reflected by the light splitter / combiner element, enter the homogenizing element; the light splitter / combiner element transmits the excitation light and part of the excited light, the part of the excited light including light of the first polarization state of the second wavelength band and / or light of the first polarization state of the third wavelength band in the excited light. The light splitter / combiner element can be a substrate with single-sided or double-sided coating; the first, second, and third wavelength bands are not limited, for example, the first wavelength band is 430-490 nm, the second wavelength band is 510-540 nm, and the third wavelength band is 625-680 nm. The second polarization state is not limited and can be either S-state or P-state. By combining the primary color light and the excited light using this beam splitter and combiner, the beam combining efficiency can be improved, thereby increasing the brightness of the projection device.

[0088] For example, the first primary color light is blue laser, the second primary color light includes red laser and green laser, the excited light includes green / red / yellow fluorescence, and the first polarization state is P-state; the film coated on the light splitter / combiner element can transmit blue light in the 430-490nm band, P-state green light in the 510-540nm band, and red light or P-state red light in the 625-680nm band, while other bands and polarization states of light are reflected; assuming, conversion The region includes yellow phosphor, and the excited light is yellow fluorescence with a wavelength range of 500-680nm. Then, the P-state light in the yellow fluorescence with a wavelength range of 510-540nm and the light in the wavelength range of 625-680nm or the P-state red light in the wavelength range of 625-680nm are transmitted through the light splitter and combiner. The S-state light in the wavelength range of 510-540nm and / or the S-state red light in the wavelength range of 625-680nm are reflected by the light splitter and combiner. Light in other wavelength ranges is also reflected. In essence, all S-state fluorescence and 35% of P-state fluorescence in the excited light (fluorescence) are reflected into the homogenizing element as the output light of the light source system. Approximately 15% of the P-state fluorescence is transmitted through the beam splitter and combiner. Therefore, the first adjustment element allows this 15% P-state fluorescence to re-enter the wavelength conversion device. Due to diffuse reflection, after reflection, this 15% P-state fluorescence will have approximately 7.5% S-state and 7.5% P-state. The 7.5% S-state is reflected back into the homogenizing element by the beam splitter and combiner, while the 7.5% P-state follows the same optical path as the previous P-state fluorescence and re-enters the wavelength conversion device, repeating this cycle. It should be noted that because the cycle converts all P-state fluorescence to S-state, if the subsequent spatial light modulator is set to a device such as an LCOS or LCD that requires polarization of the incident light, then polarization conversion elements such as PBS or PCS on the incident side are not necessary, reducing the number of devices while maintaining high brightness.

[0089] Optionally, the first primary color light is blue laser, the second primary color light includes red laser, and the excited light includes green / red / yellow fluorescence; the polarization states of the blue and red lasers are S-state or P-state, and the wavelength ranges of the red laser and the red / yellow fluorescence do not overlap or partially overlap. The optical splitter / combiner allows the transmission of S-state and / or P-state blue and red lasers, the transmission of P-state or S-state light in some wavelength ranges of the red / green / yellow fluorescence, and the reflection of light in other wavelength ranges and polarization states. For example, the film coated on the optical splitter / combiner can transmit P-state and / or S-state blue light in the 440-485nm wavelength range and P-state and / or S-state red light in the wavelength range greater than 610nm and greater than 620nm, while reflecting light in other wavelength ranges. Assuming the stimulated light is yellow fluorescence with a wavelength range of 500-680nm, then the P-state light in the 610-620nm wavelength range of the yellow fluorescence is transmitted through a light splitter and combiner, the S-state light in the 610-620nm wavelength range is reflected by the light splitter and combiner, and the light in other wavelength ranges is also reflected. Part of the stimulated light includes the P-state light in the 610-620nm wavelength range.

[0090] Therefore, the first adjustment element and the light splitting and combining element can split the first primary color light, so that part of it is used as excitation light and part of it is used as the output light of the lighting system. At the same time, the first adjustment element can also recover part of the excited light. Furthermore, if the second adjustment element is integrated with the first adjustment element, this embodiment can use a single element to realize the re-excitation of residual excitation light, the recovery of excited light, and the splitting of the first primary color light, making the lighting system simple in structure, small in size, and with high light utilization and brightness.

[0091] Optionally, a shaping lens group is provided on the light-emitting side of the wavelength conversion device, which can be used to collect the excited light emitted from the wavelength conversion device and focus and collimate it.

[0092] The light homogenizing element 50 is used to homogenize the incident primary color light, secondary primary color light and excited light, and then use them as the output light of the illumination system.

[0093] The light-diffusing element can be a light bar, a single-sided compound eye, a double-sided compound eye, etc. Optionally, a shaping lens group and a reflecting element can be set between the light-diffusing element and the light-splitting and combining element. Before the first primary color light, the second primary color light, and the stimulated light enter the light-diffusing element, they can be focused and collimated by the shaping lens group, and then reflected by the reflecting element to the light-diffusing element. The reflecting element can adjust the optical axis of each light so that the light enters the light-diffusing element coaxially.

[0094] In summary, the lighting system provided in this embodiment achieves the splitting of the first primary color light through a light adjustment device and a partitioned light splitting and combining element, so that a portion is used as excitation light and the other portion is used as the emitted light of the lighting system; at the same time, the light adjustment device can also realize the recovery of part of the excited light and the re-excitation of the residual excitation light; therefore, the lighting system has a simple structure and small size, while improving the light utilization rate of the lighting system and the brightness of the lighting equipment.

[0095] Figure 5 This is a schematic diagram of the functional modules of a lighting device provided in this application. Figure 5 As shown, the lighting device includes an image processor 101 and a projection optical engine 102. Wherein:

[0096] The image processor 101 can be a microcontroller, a dedicated image processing chip, etc. The microcontroller can be an ARM chip, a microcontroller unit (MCU), etc.; the dedicated image processing chip can be an image signal processor (ISP), a graphics processing unit (GPU), an embedded neural network processing unit (NPU), etc. The image processor 101 can be used for video decoding, image quality processing, etc.

[0097] The projection optical engine 102 may include a driver chip, a spatial light modulator, and the lighting system described in the above embodiments. The spatial light modulator may be a digital micromirror device (DMD), a liquid crystal display (LCD), or a liquid crystal on silicon (LCOS), etc. The driver chip corresponds to the spatial light modulator; for example, the digital micromirror device may be driven by a digital light processing (DLP) element. The projection optical engine 102 is used to project the image to be projected into a projection screen.

[0098] In some embodiments, the lighting device further includes a central controller 103 with one or more processing cores, which may be a CPU, ARM, MCU, or other controller. The central controller 103 is the control center of the lighting device, connecting various parts of the entire lighting device via various interfaces and lines. It can run or execute software programs and / or operating systems stored in the memory 104, and access data stored in the memory 104. Optionally, the image processor 101 and the central controller 103 may be integrated into a single processor.

[0099] In some embodiments, the lighting device further includes a memory 104, an input module 105, a communication module 106, a power supply 107, and other components of one or more computer-readable storage media. Those skilled in the art will understand that... Figure 5 The lighting device structure shown does not constitute a limitation on the lighting device and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Wherein:

[0100] The memory 104 can be used to store software programs and operating systems. The central controller 103 executes various functional applications and data processing by running the software programs and operating systems stored in the memory 104. The memory 104 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created based on the use of the lighting equipment, etc. In addition, the memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 104 may also include a memory controller to provide the central controller 103 with access to the memory 104.

[0101] The lighting device may also include an input module 105, which can be used to receive input digital or character information, and generate remote control, keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0102] The lighting device may also include a communication module 106. In some embodiments, the communication module 106 may include a wireless module, through which the lighting device can perform short-range wireless transmission, thereby providing users with wireless broadband internet access. For example, the communication module 106 can be used to help users access streaming media, etc.

[0103] The lighting equipment also includes a power supply 107 that supplies power to the various components. In some embodiments, the power supply 107 can be logically connected to the central controller 103 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 107 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0104] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items. The character “ / ” in this document generally indicates that the preceding and following objects are in an “or” relationship.

[0105] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A lighting system, characterized by The illumination system comprises: a light source for emitting first primary color light and second primary color light; a light-splitting and light-combining element for guiding the excited light and the second primary color light to the light-uniformizing element; including a target region for splitting the incident first primary color light into a first light beam and a second light beam, the first light beam being incident on a first adjusting element, and the second light beam being incident on a light-uniformizing element; and a remaining region for guiding the incident first primary color light to the light-uniformizing element, and guiding the first light beam incident from the first adjusting element to a wavelength conversion device; a target distance being present between a center point of the target region and a center of a light spot of the first light beam incident on the remaining region from the first adjusting element; the light adjusting device comprises a first adjusting element for reflecting the first light beam back to the light-splitting and light-combining element; wherein an incident light ray when the first light beam is incident is parallel to an emergent light ray when the first light beam is emitted, and an incident angle when the first light beam is incident is equal to or different from an emergent angle when the first light beam is emitted by 90 degrees; the wavelength conversion device is excited by the first light beam to emit the excited light, and the second primary color light and the excited light have a coinciding wavelength band; the light-uniformizing element is used for light-uniformizing the incident first primary color light, second primary color light and excited light, and emitting the light-uniformized light as the light emitted by the illumination system.

2. The lighting system of claim 1, characterized in that The light adjusting device further comprises a second adjusting element, and the wavelength conversion device emits the excited light and residual excitation light; the residual excitation light is incident on the second adjusting element through the light-splitting and light-combining element, is reflected back to the light-splitting and light-combining element by the second adjusting element, and is incident on the wavelength conversion device through the light-splitting and light-combining element for re-excitation.

3. The illumination system according to claim 2, wherein: the first adjusting element and the second adjusting element are independent elements, an included angle between the second adjusting element and the light-splitting and light-combining element is a second angle, and the residual excitation light is incident on the second adjusting element perpendicularly and is reflected back to the light-splitting and light-combining element by the second adjusting element; or, the first adjusting element and the second adjusting element are integrated, and the second adjusting element is located at one end or both ends of the first adjusting element; or, the second adjusting element is parallel to the light-splitting and light-combining element.

4. The lighting system of claim 1, wherein, the second primary color light and the excited light have a coinciding wavelength band; part of the excited light is incident on the first adjusting element after the excited light passes through the light-splitting and light-combining element, and the part of the excited light is the excited light having a coinciding wavelength band and a same polarization state as the second primary color light; the first adjusting element reflects the part of the excited light back to the light-splitting and light-combining element, and the part of the excited light is incident on the wavelength conversion device through the light-splitting and light-combining element; The first stimulated light and the second stimulated light are emitted after conversion by the wavelength conversion device, the polarization state of the second stimulated light is the same as the polarization state of the part of the stimulated light, and the polarization state of the first stimulated light is different from the polarization state of the second stimulated light; the first stimulated light is incident on the light homogenizing element to perform light homogenization; and the second stimulated light is incident on the first adjusting element, and the cycle is repeated.

5. The lighting system of claim 1, wherein, The light adjusting device comprises a driving device corresponding to the first adjusting element. The driving device drives the first adjusting element to perform periodic reciprocating motion, and there is an optical path difference between light incident on the first adjusting element at a current moment and light incident on the first adjusting element at a previous moment, the first adjusting element is at different positions in the optical path at the current moment and the previous moment; and / or the motion direction of the first adjusting element is parallel or perpendicular to the optical axis when the light source light is incident or the optical axis when the light is emitted. Alternatively, the driving device drives the first adjusting element to rotate.

6. The lighting system of claim 1, wherein, The first adjusting element comprises at least three reflecting surfaces or two reflecting surfaces, the reflecting surfaces are arranged perpendicular to each other, and the incident light rays and the emitted light rays are parallel after the light incident on the first adjusting element is reflected by the three reflecting surfaces or the two reflecting surfaces.

7. The lighting system of claim 1, wherein, The first adjusting element comprises two reflecting surfaces, the included angle between the two reflecting surfaces is kept unchanged, and the optical axes of the two reflecting surfaces are adjusted so that the incident light rays and the emitted light rays are parallel when the light is incident on the first adjusting element and when the light is emitted.

8. The illumination system according to claim 1, wherein the optical axis of the first light beam emitted from the first adjusting element is parallel to the normal line of the wavelength conversion device; and / or the optical axis of the residual excitation light when the residual excitation light is incident on the second adjusting element is parallel to the optical axis of the first light beam emitted from the first adjusting element; and / or the incident point of the residual excitation light when the residual excitation light is incident on the light splitting and light combining element and the emission point of the first light beam when the first light beam is emitted from the light splitting and light combining element are on a straight line with the center point of the light splitting and light combining element.

9. The illumination system according to claim 8, wherein the target area is the middle area of the light splitting and light combining element; and / or the size of the target area is 50% to 30% of the size of the spot of the first primary color light on the light splitting and light combining element; and / or the ratio of the luminous flux of the first light beam to the luminous flux of the second light beam is a first ratio.

10. The lighting system of claim 1, wherein, A speckle suppression element is arranged between the first adjusting element and the light splitting and light combining element, and the first light beam emitted from the first adjusting element is incident on the light splitting and light combining element after speckle suppression by the speckle suppression element.

11. An illumination device, characterized by The illumination system according to any one of claims 1 to 10.

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