Illumination system and projection device

Abstract

This application discloses a lighting system and a projection device, belonging to the field of projection technology. The lighting system includes a light source assembly, a light homogenizing assembly, a prism assembly, and a light valve assembly. The light homogenizing assembly includes a first light homogenizing assembly and a second light homogenizing assembly, which are used to homogenize a first beam and a second beam from the light source assembly, respectively, and then guide the homogenized beams to the prism assembly. The first beam and the second beam have the same color, and in a first field of view of the lighting system, the light intensity of the first beam is less than that of the second beam; in a second field of view of the lighting system, the light intensity of the first beam is greater than that of the second beam. This allows the light intensities of different beams to complement each other in the same field of view, thereby solving the problem of uneven illuminance after processing by the light homogenizing assembly in related technologies, and achieving the effect of improving the illuminance uniformity of the lighting system.

Description

Technical Field

[0001] This application relates to the field of projection technology, and in particular to a lighting system and projection device. Background Technology

[0002] Currently, laser projection technology is a new type of projection display technology on the market. Laser projection display technology features high image contrast, clear imaging, vibrant colors, and higher brightness. These significant characteristics are gradually making laser projection display technology another mainstream development direction in the market. With the development of projector technology and the market, in order to provide users with a better viewing experience, projectors with more uniform illumination are needed.

[0003] An illumination system for a laser display projection device includes a light valve, a light source assembly, a light guide, a prism assembly, and a lens. The light source assembly emits a light beam, which exits to the light guide. After processing the light beam, the light guide guides it to the prism assembly. The prism assembly receives the light beam and then exits it to the light valve. The light valve processes the light beam and then exits it to the prism assembly. After passing through the prism assembly, the light beam enters the lens. In use, the light guide can be used to homogenize the light beam provided by the light source assembly and shape the beam to match the shape of the light valve.

[0004] However, in the above lighting system, the intensity of the emitted light beam after being processed by the light homogenizing component is not uniform, resulting in uneven illuminance of the projector. Summary of the Invention

[0005] This application provides a lighting system and a projection device, the technical solutions of which are as follows:

[0006] According to a first aspect of this application, a lighting system is provided, the lighting system comprising: a light source assembly, a light-diffusing assembly, a prism assembly, and a light valve assembly arranged sequentially along the light path direction;

[0007] The light-uniforming component includes a first light-uniforming component and a second light-uniforming component. The first light-uniforming component is used to uniformly process a first light beam provided by the light source component and then guide it to the prism component. The second light-uniforming component is used to uniformly process a second light beam provided by the light source component and then guide it to the prism component. The prism component is used to guide the light beam received from the light-uniforming component to the light valve component. The first light beam and the second light beam have the same color, and the light intensity of the first light beam in the first field of view of the lighting system is less than the light intensity of the second light beam in the first field of view. The light intensity of the first light beam in the second field of view of the lighting system is greater than the light intensity of the second light beam in the second field of view.

[0008] Optionally, the difference between the first superimposed light intensity and the second superimposed light intensity is less than a threshold, wherein the first superimposed light intensity is the superimposed light intensity of the first beam and the second beam in the first field of view, and the second superimposed light intensity is the superimposed light intensity of the first beam and the second beam in the second field of view.

[0009] Optionally, in any two fields of view of the lighting system, the difference in the superimposed light intensity of the first beam and the second beam is less than the threshold.

[0010] Optionally, the threshold is positively correlated with the maximum light intensity in the field of view of the lighting system.

[0011] Optionally, the light homogenizing component further includes a third light homogenizing component, which is used to homogenize the third beam provided by the light source component and then guide it to the prism component. The difference between the third superimposed light intensity and the fourth superimposed light intensity is less than a threshold value. The third superimposed light intensity is the superimposed light intensity of the first beam, the second beam, and the third beam in the first field of view. The fourth superimposed light intensity is the superimposed light intensity of the first beam, the second beam, and the third beam in the second field of view.

[0012] Optionally, both the first beam and the second beam are white light beams.

[0013] Optionally, both the first beam and the second beam are white light beams composed of a mixture of red, blue, and green light.

[0014] Optionally, the first light-diffusing component and the second light-diffusing component are light guides of different lengths.

[0015] Optionally, the first light-diffusing component and the second light-diffusing component are compound eye lenses with different numbers of compound eyes.

[0016] Optionally, the prism assembly includes a first prism assembly and a second prism assembly, wherein the first prism assembly is used to receive a first beam of light provided by the first homogenizing assembly, and the second prism assembly is used to receive a second beam of light provided by the second homogenizing assembly.

[0017] On the other hand, a laser projector is provided, which includes any of the lighting systems described above.

[0018] The beneficial effects of the technical solutions provided in this application include at least the following:

[0019] A lighting system is provided, comprising a light source assembly, a light homogenizing assembly, a prism assembly, and a light valve assembly. The light homogenizing assembly includes a first light homogenizing assembly and a second light homogenizing assembly, which are used to homogenize a first beam and a second beam from the light source assembly, respectively, and then guide the homogenized beams to the prism assembly. The first and second beams have the same color, and in a first field of view of the lighting system, the light intensity of the first beam is less than that of the second beam; in a second field of view of the lighting system, the light intensity of the first beam is greater than that of the second beam. Thus, by homogenizing the beams using different light homogenizing assemblies, the light intensities of different beams are complementary in the same field of view, solving the problem of uneven illuminance after processing by the light homogenizing assembly in related technologies, and achieving the effect of improving the uniformity of illuminance provided by the lighting system. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram illustrating an implementation environment according to an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the structure of a lighting system in related technologies;

[0023] Figure 3 This is a schematic diagram of the light intensity distribution of the emitted beam from the light source component;

[0024] Figure 4 This is a diagram illustrating the effect of homogenizing the light beam.

[0025] Figure 5 This is a schematic diagram of the structure of a lighting system provided in an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the field of view of a lighting system provided in an embodiment of this application;

[0027] Figure 7 This is a schematic diagram of another lighting system provided in an embodiment of this application;

[0028] Figure 8 yes Figure 7 A schematic diagram of the light intensity distribution of a first beam after homogenization in the embodiment shown;

[0029] Figure 9 yes Figure 7A schematic diagram of the light intensity distribution of a second beam after homogenization in the embodiment shown.

[0030] Figure 10 yes Figure 7 A schematic diagram of the light intensity distribution after the superposition of two light beams in the embodiment shown.

[0031] Figure 11 This is another structural design intent of the lighting system provided in the embodiments of this application;

[0032] Figure 12 This is a schematic diagram of another lighting system provided in an embodiment of this application;

[0033] Figure 13 This is a schematic diagram of the structure of a laser projector provided in an embodiment of this application.

[0034] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0036] Figure 1 This is a schematic diagram of the implementation environment involved in the embodiments of this application. The implementation environment may include a laser projector 10 and a projection screen 20.

[0037] The laser projector 10 may include an illumination system 11 and a projection lens 12. The illumination system 11 is used to provide a light source to the projection lens 12, and the projection lens 12 is used to project a preset pattern onto the projection screen 20 according to the light source provided by the illumination system 11.

[0038] The projection screen 20 is used to carry the pattern projected by the projection lens 12. The projection screen 20 can be made of various materials, such as polyvinyl chloride (PVC), metal, fiberglass, and glass beads, etc., and the embodiments of this application do not impose any limitations.

[0039] Figure 2This is a schematic diagram of a lighting system 30 in related technology. The lighting system 30 includes a light valve 31, a light source assembly 32, a light guide 33, a prism assembly 34, and a lens 35. The light source assembly 32 emits a light beam, which is then directed to the light guide 33. After processing the light beam, the light guide 33 guides it to the prism assembly 34. The prism assembly 34 receives the light beam and then emits it to the light valve 31. The light valve 31 processes the light beam and then emits it back to the prism assembly 34. After passing through the prism assembly 34, the light beam enters the lens 35. In use, the light guide can be used to homogenize the light beam provided by the light source assembly and shape the beam to match the shape of the light valve.

[0040] The aforementioned lighting system only has one light guide 33. Generally, the light intensity distribution of the emitted beam from the light source assembly 32 is Gaussian, such as... Figure 3 The diagram shows the intensity distribution of the emitted light beam. Within a certain beam diameter range, the intensity distribution varies, with the central beam exhibiting the highest intensity and gradually decreasing towards the perimeter. The purpose of homogenizing the illumination system is to ensure that the intensity of the central beam is close to that of the surrounding beams within a given beam diameter range. Figure 4 The image shown illustrates the desired effect of homogenization. The illuminance uniformity of a lighting system can be defined as the ratio of minimum illuminance to average illuminance; the closer the ratio is to 1, the more uniform the illuminance. In related technologies, the illuminance uniformity of lighting systems is around 85%. To further improve the illuminance uniformity after beam homogenization, extremely long light guides would be required, but this would result in an excessively large lighting system, hindering mass production and market entry of laser projectors.

[0041] This application provides a lighting system and a projection device that can solve some of the problems in the related technologies mentioned above.

[0042] Figure 5 This is a schematic diagram of the structure of a lighting system provided in an embodiment of this application.

[0043] The lighting system 11 includes: a light source assembly 111, a light-diffusing assembly 112, a prism assembly 113, and a light valve assembly 114 arranged sequentially along the light path.

[0044] The light homogenizing component 112 includes a first light homogenizing component 1121 and a second light homogenizing component 1122. The first light homogenizing component 1121 is used to homogenize the first beam provided by the light source component 111 and then guide it to the prism component 113. The second light homogenizing component 1122 is used to homogenize the second beam provided by the light source component 111 and then guide it to the prism component 113. The prism component 113 is used to guide the beam received from the light homogenizing component 112 to the light valve component 114. The first beam and the second beam have the same color, and the light intensity of the first beam in the first field of view of the lighting system is less than the light intensity of the second beam in the first field of view. The light intensity of the first beam in the second field of view of the lighting system is greater than the light intensity of the second beam in the second field of view.

[0045] In summary, the embodiments of this application provide an illumination system comprising a light source assembly, a light homogenizing assembly, a prism assembly, and a light valve assembly arranged sequentially along the optical path. The light homogenizing assembly includes a first light homogenizing assembly and a second light homogenizing assembly, which are used to homogenize a first beam and a second beam from the light source assembly, respectively, and then guide the homogenized beams to the prism assembly. The first and second beams have the same color, and in the first field of view of the illumination system, the light intensity of the first beam is less than that of the second beam; in the second field of view of the illumination system, the light intensity of the first beam is greater than that of the second beam. Thus, by homogenizing the beams using different light homogenizing assemblies, the light intensities of different beams are complementary in the same field of view, solving the problem of uneven illuminance of the beams after processing by the light homogenizing assembly in related technologies, and achieving the effect of improving the uniformity of illuminance provided by the illumination system.

[0046] like Figure 6 As shown, this is a schematic diagram of the field of view of a lighting system. The field of view in a lighting system can be defined as a rectangular field of view, where each point within the rectangular area can represent a field of view. Optionally, such as... Figure 6 The diagram illustrates a normalized coordinate lighting system. The system's field of view can include nine distinct fields: (-1, 1), (0, 1), (1, 1), (-1, 0), (0, 0), (1, 0), (-1, -1), (0, -1), and (1, -1). Different light beams are homogenized by a homogenizing component before exiting the system. The intensity of these different beams can complement each other within the same field of view, resulting in more uniform illuminance.

[0047] Figure 7 This is another structural design intent of the lighting system provided in the embodiments of this application.

[0048] The lighting system 11 includes: a light source assembly 111, a light-diffusing assembly 112, a prism assembly 113, and a light valve assembly 114 arranged sequentially along the light path.

[0049] The light valve assembly 114 includes a first light valve 1141 and a second light valve 1142. The light source assembly 111 guides a first light beam provided by the light source 1111 to a first homogenizing assembly 1121. The first homogenizing assembly 1121 homogenizes the first light beam and then guides it to a prism assembly 113. After being processed by the prism assembly 113, the first light beam is guided to the first light valve 1141. The first light valve 1141 receives the first light beam from the prism assembly 113 and guides it through the prism assembly 113 via reflection. The first light beam is then emitted through the prism assembly 113. Similarly, the light source assembly 111 guides a second light beam provided by the light source 1112 to a second homogenizing assembly 1122. The second homogenizing assembly 1122 homogenizes the second light beam and then guides it to the prism assembly 113. After being processed by the prism assembly 113, the second light beam is guided to the second light valve 1142. The second light valve 1142 receives the second light beam from the prism assembly 113 and guides it through the prism assembly 113 via reflection. The second light beam is then emitted through the prism assembly 113. The first beam and the second beam have the same color, and the light intensity of the first beam in the first field of view of the lighting system is less than that of the second beam in the first field of view, while the light intensity of the first beam in the second field of view of the lighting system is greater than that of the second beam in the second field of view.

[0050] Laser projection technology projects a beam of light, which forms an image, onto a screen, wall, or other surface, and then reflects it into the viewer's eyes. Laser projection technology is significantly affected by ambient light levels; therefore, higher-brightness projection products offer a better viewing experience in brighter environments (e.g., daytime, shopping malls). Since the luminous flux handled by a single light valve in existing projection technologies is relatively low, a dual-light-valve or multi-light-valve illumination system can be used in this embodiment to achieve higher brightness, thereby increasing the luminous flux.

[0051] Among them, the light intensity distribution of a first beam after being homogenized by a first homogenizing component is as follows: Figure 8 As shown, the light intensity distribution of a second beam after being homogenized by a second homogenizing component is as follows: Figure 9 As shown, the light intensities of the first beam and the second beam are superimposed after exiting through the first and second homogenizing components, respectively. Figure 10 The diagram shows the light intensity distribution after the superposition of two beams. By using the complementary superposition of the light intensities homogenized by two homogenizing components, the light intensity at various points within a certain beam diameter range can be made more uniform, thereby improving the illuminance uniformity of the system. Figure 8 , Figure 9 as well as Figure 10 The horizontal axis represents the beam diameter (mm), and the vertical axis represents the light intensity (W / cm²). 2 The cross-section of the light guide tube is rectangular, and the spot of the emitted light beam is elliptical. Figure 8 , Figure 9The solid lines in the diagram represent the light intensity along the shorter side of the rectangular cross-section when the light beam exits the light guide, while the dashed lines represent the light intensity along the longer side of the rectangular cross-section when the light beam exits the light guide. Figure 10 The solid line in the figure represents the light intensity along the minor axis of the elliptical spot of the beam after the outgoing beams are superimposed, and the dashed line represents the light intensity along the major axis of the elliptical spot of the beam after the outgoing beams are superimposed.

[0052] Optionally, the difference between the first superimposed light intensity and the second superimposed light intensity is less than a threshold. Light intensity is a physical quantity used to represent the luminous flux per unit solid angle in a given direction of a light source, with the SI unit being the candela (symbol: cd). The light intensities are superimposed linearly. The first superimposed light intensity is the superimposed light intensity of the first beam and the second beam in the first field of view, and the second superimposed light intensity is the superimposed light intensity of the first beam and the second beam in the second field of view. The difference between the first and second superimposed light intensities can be controlled within a preset threshold, making the light intensities of the first and second fields of view essentially the same. This results in more uniform illuminance in both fields, leading to more uniform illuminance on the displayed image and preventing uneven brightness in the displayed image.

[0053] Optionally, the aforementioned threshold is positively correlated with the maximum luminous intensity in the field of view of the lighting system. That is, the maximum luminous intensity and the threshold change in the same direction; the greater the maximum luminous intensity, the greater the threshold, and vice versa. The maximum luminous intensity can be the superimposed luminous intensity of multiple light beams in a certain field of view within the lighting system.

[0054] Optionally, in any two fields of view of the lighting system, the difference in the superimposed light intensity of the first beam and the second beam is less than a threshold. The lighting system can be divided into multiple fields of view. In any two of these fields of view, the difference in the superimposed light intensity of the first beam and the second beam can be controlled within a preset threshold. This ensures that the light intensity of the multiple fields of view of the lighting system is basically the same, resulting in more uniform illuminance across all fields of view and a more uniform illuminance on the displayed image. This avoids uneven brightness in the displayed image and improves the viewing experience.

[0055] Optionally, both the first beam and the second beam are white light beams. White light beams can be used for color displays.

[0056] Optionally, both the first beam and the second beam are white light beams composed of a mixture of red, blue, and green light. The light source components can be the same type of laser, thus emitting a white light beam composed of red, blue, and green light.

[0057] Optionally, the first and second homogenizing components are light guides of different lengths. The light guides can be used to shape and homogenize the laser beam incident from the light source. Different lengths of light guides have different homogenizing effects on the beam. The length of the light guide can be determined experimentally. As in the embodiment of this application, the light intensity of the emitted light after the first beam passes through the first homogenizing component and the light intensity of the emitted light after the second beam passes through the second homogenizing component can be... Figure 6 The beams are superimposed in the field of view shown. By changing the lengths of the first and second beam homogenizing components and through continuous experimentation, the lengths of the different light guides are obtained when the emitted light from the first and second beams, after homogenization by light guides of different lengths, can be complementary within the same field of view. This length is the length of the different light guides in the embodiment of this application. After homogenization by light guides of different lengths obtained through experiments, the light intensity of different beams can be complementary within the same field of view, thereby improving the illuminance uniformity of the lighting system. Beam homogenization refers to shaping a beam with uneven intensity distribution into a beam with a uniform cross-sectional distribution through beam transformation. Laser spots refer to the bright or dark spots formed by the laser light source when it is used to illuminate a rough surface such as a screen or any other object that produces diffuse reflection or diffuse transmission, resulting in a random granular intensity pattern. Optionally, the lighting system provided in the embodiment of this application may have nine fields of view.

[0058] A light guide is a tubular device made up of four planar reflective sheets, also known as a hollow light guide. Light is reflected multiple times inside the light guide to achieve a uniform light effect. A solid light guide can also be used. The light inlet and light outlet of the light guide are rectangles with the same shape and area. The light beam enters from the light inlet of the light guide and exits from the light outlet of the light guide. During the process of passing through the light guide, the light beam is homogenized and the laser spot is optimized.

[0059] Optionally, the first and second beam homogenizing components are compound-eye lenses with different numbers of compound eyes. Compound-eye lenses can be used to shape and homogenize the laser beam incident from the light source. Compound-eye lenses with different numbers of compound eyes have different homogenizing effects on the beam. The number of compound eyes in a compound-eye lens can be determined experimentally, allowing different beams to complement each other within the same field of view after being homogenized by lenses with different numbers of compound eyes, thus improving illumination uniformity. Beam homogenization refers to shaping a beam with uneven intensity distribution into a beam with a uniform cross-sectional distribution through beam transformation. A laser beam spot refers to a bright or dark spot formed when a laser light source is used to illuminate a rough surface such as a screen or any other object that produces diffuse reflection or diffuse transmission, creating a random, granular intensity pattern.

[0060] Compound eye lenses are typically formed by combining a series of small lenses. Two rows of compound eye lens arrays are arranged in parallel to divide the light spot of the input laser beam. The divided light spots are then accumulated by a subsequent focusing lens, thereby achieving beam homogenization and light spot optimization.

[0061] Optionally, the prism assembly 113 may include a first prism M, a second prism, and a second prism N. The first prism M, the second prism, and the second prism N are glued together, with an air gap between them.

[0062] The light source assembly 111 guides the first beam provided by the light source 1111 to the first homogenizing assembly 1121. The first homogenizing assembly 1121 homogenizes the first beam and then guides it to the a-face of the first triangular prism M. After total internal reflection at the b-face of the first triangular prism M, the first beam passes through the c-face of the first triangular prism M and is guided to the first optical valve 1141. The first optical valve 1141 receives the first beam from the first triangular prism M and guides it through reflection to the second prism and the second triangular prism N. Then, the first beam exits from the f-face of the second triangular prism N. The light source assembly 111... The second beam provided by the light source 1112 is guided to the second homogenizing component 1122. After homogenizing the second beam, the second homogenizing component 1122 guides it to the first triangular prism M. After total internal reflection at the c-face of the first triangular prism M, the beam is refracted at the b-face of the first triangular prism and the d-face of the second triangular prism N, and then guided to the second light valve 1142. The second light valve 1142 is used to receive the refracted second beam and emit the second beam through the e-face of the second triangular prism N. Then, after total internal reflection at the d-face of the second triangular prism N, the second beam is emitted from the f-face of the second triangular prism.

[0063] In this embodiment, the first prism can be a total internal reflection (TIR) ​​prism, the second prism can be a wedge prism, and the third prism can be a 45° isosceles right-angle reverse total internal reflection (RTIR) prism. The first, wedge, and second prisms are used to separate the illumination beam and the imaging beam in the optical path. The first prism separates the illumination beam and the imaging beam in the first beam optical path, and the second prism separates the illumination beam and the imaging beam in the second beam optical path. It also merges the imaging beam in the first beam optical path. The prism assembly in this embodiment can merge the optical paths of the first and second beams, effectively reducing the size of the illumination system.

[0064] The first beam of light underwent total internal reflection at the b-face of the first prism M, and the second beam underwent total internal reflection at the c-face of the first prism M and the d-face of the second prism, respectively. Total internal reflection is an optical phenomenon in which, when light passes through two media with different refractive indices, some of the light is refracted at the interface of the media, and the rest is reflected. However, when the angle of incidence is larger than the critical angle (the light moves away from the normal), the light stops entering the other interface and is reflected entirely inward. This phenomenon only occurs when light enters from an optically denser medium (a medium with a higher refractive index) to an optically less dense medium (a medium with a lower refractive index). When the angle of incidence is greater than the critical angle, there is no refraction (the refracted light disappears) and all light is reflected, hence the name total internal reflection.

[0065] For total internal reflection to occur, the following formula must be satisfied:

[0066]

[0067] Where θ is the angle of incidence, n1 is the refractive index of the optically denser medium, and n2 is the refractive index of the optically less dense medium.

[0068] Optionally, a collimating lens assembly may be present between the light homogenizing assembly and the light valve assembly. The light homogenizing assembly and the collimating transparent assembly can homogenize the light beam in the illumination system and collimate the light beam entering the prism assembly. The collimating lens assembly may include a first spherical lens (or aspherical lens), a second spherical lens (or aspherical lens), or a third spherical lens (or aspherical lens), and the collimating lens assembly may be placed perpendicular to the optical axis, thereby serving to converge and collimate the light beam.

[0069] Optionally, a diffusion wheel can be provided between the light source component and the beam homogenizing component. Laser projection devices are prone to speckle phenomena during projection. When a diffusion wheel is provided between the light source component and the beam homogenizing component, the laser emitted by the light source component becomes more uniform under the action of the diffusion wheel. This weakens the interference produced by the laser beams, reducing speckle phenomena during projection, preventing image distortion, improving the display effect, and avoiding dizziness for the human eye. Speckle phenomena refer to the phenomenon where different beams emitted by the laser light source component, due to high coherence, are scattered when irradiating a rough object (such as the projection screen). These different beams interfere in space, resulting in granular, alternating bright and dark spots on the screen. Speckle phenomena result in poor display effects, and these unfocused bright and dark spots appear to flicker to the human eye, easily causing dizziness after prolonged viewing, leading to a poor viewing experience.

[0070] In summary, the embodiments of this application provide an illumination system comprising a light source assembly, a light homogenizing assembly, a prism assembly, and a light valve assembly arranged sequentially along the optical path. The light valve assembly includes a first light valve and a second light valve. The light source assembly guides a first light beam it provides to the first light homogenizing assembly. The first light homogenizing assembly homogenizes the first light beam and then guides it to the prism assembly. After total internal reflection by the prism assembly, the first light beam is guided to the first light valve. The first light valve receives the first light beam from the prism assembly and guides it through reflection to the prism assembly, whereby the first light beam is refracted and emitted. Similarly, the light source assembly guides a second light beam it provides to the second light homogenizing assembly. The second light homogenizing assembly homogenizes the second light beam and then guides it to the prism assembly. After refraction by the prism assembly, the second light beam is guided to the second light valve. The second light valve receives the second light beam from the prism assembly and guides it through reflection to the prism assembly, whereby the second light beam is processed by the prism assembly and emitted. In this way, different light-uniforming components can be used to homogenize different light beams and achieve complementary light intensity, which can solve the problem of uneven illuminance of the light beam after processing by the light-uniforming components in related technologies, and achieve the effect of uniform illuminance of the laser projector. At the same time, the high luminous flux of the dual-light valve illumination system can improve the display brightness of the laser projector, so that the laser projector will have a better viewing experience when used in bright ambient light conditions (such as daytime, shopping malls).

[0071] Figure 11 This is a schematic diagram of another lighting system provided in an embodiment of this application.

[0072] The lighting system 11 includes: a light source assembly 111, a light-diffusing assembly 112, a prism assembly 113, and a light valve assembly 114 arranged sequentially along the light path.

[0073] The light homogenizing component 112 includes a first light homogenizing component 1121 and a second light homogenizing component 1122. The first light homogenizing component 1121 is used to homogenize the first beam provided by the light source component 111 and then guide it to the prism component 113. The second light homogenizing component 1122 is used to homogenize the second beam provided by the light source component 111 and then guide it to the prism component 113. The prism component 113 is used to guide the beam received from the light homogenizing component 112 to the light valve component 114. The first beam and the second beam have the same color, and the light intensity of the first beam in the first field of view of the lighting system is less than the light intensity of the second beam in the first field of view. The light intensity of the first beam in the second field of view of the lighting system is greater than the light intensity of the second beam in the second field of view.

[0074] Optionally, the homogenizing component further includes a third homogenizing component 1123. The third homogenizing component 1123 is used to homogenize the third beam provided by the light source component 111 and guide it to the prism component 113. The difference between the third superimposed light intensity and the fourth superimposed light intensity is less than a threshold. The third superimposed light intensity is the superimposed light intensity of the first beam, the second beam, and the third beam in the first field of view, and the fourth superimposed light intensity is the superimposed light intensity of the first beam, the second beam, and the third beam in the second field of view. When the number of beams increases, the number of homogenizing components can be increased accordingly, so that any beam can be homogenized by a corresponding homogenizing component, thereby improving the homogenization effect.

[0075] In summary, the embodiments of this application provide an illumination system comprising a light source assembly, a light homogenizing assembly, a prism assembly, and a light valve assembly arranged sequentially along the optical path. The light homogenizing assembly includes a first, second, and third light homogenizing assembly, which homogenize the first, second, and third beams from the light source assembly, respectively. The homogenized beams are then guided to the prism assembly, which guides the beams received from the light homogenizing assembly to the light valve. The first, second, and third beams have the same color, and the difference between the third and fourth superimposed light intensities in the illumination system is less than a threshold. The third superimposed light intensity is the superimposed light intensity of the first, second, and third beams in the first field of view, and the fourth superimposed light intensity is the superimposed light intensity of the first, second, and third beams in the second field of view. Thus, by homogenizing the beams using different light homogenizing assemblies, the light intensities of different beams can be complementary in the same field of view, solving the problem of uneven illuminance after processing by the light homogenizing assembly in related technologies, and achieving the effect of improving the uniformity of illuminance provided by the illumination system.

[0076] Figure 12 This is a schematic diagram of another lighting system provided in an embodiment of this application.

[0077] The lighting system 11 includes a light source assembly 111, a light-diffusing assembly 112, a prism assembly 113, and a light valve assembly 114 arranged sequentially along the light path.

[0078] The prism assembly 113 includes a first prism assembly 1131 and a second prism assembly 1132. The first prism assembly 1131 is used to receive a first light beam provided by the first light homogenizing assembly 1121, and the second prism assembly 1132 is used to receive a second light beam provided by the second light homogenizing assembly 1122.

[0079] The light source assembly 111 guides the first beam it provides to the first homogenizing assembly 1121. The first homogenizing assembly 1121 homogenizes the first beam and then guides it to the first prism assembly 1131. After total internal reflection by the first prism assembly 1131, the first beam is guided to the first light valve 1141. The first light valve 1141 receives the first beam from the first prism assembly 1131 and guides it to the first prism assembly 1131 through reflection. Then, the first beam is refracted and emitted by the first prism assembly 1131. The light source assembly 111 guides the second beam it provides to the second homogenizing assembly 1122. The second homogenizing assembly 1122 homogenizes the second beam and then guides it to the second prism assembly 1132. After refraction by the second prism assembly 1132, the second beam is guided to the second light valve 1142. The second light valve 1142 receives the second beam from the second prism assembly 1132 and guides it to the second prism assembly 1132 through reflection. Then, the second beam is processed by the second prism assembly 1132 and emitted.

[0080] In summary, the embodiments of this application provide an illumination system comprising a light source assembly, a light homogenizing assembly, a prism assembly, and a light valve assembly arranged sequentially along the optical path. The light homogenizing assembly includes a first light homogenizing assembly and a second light homogenizing assembly, which are used to homogenize a first beam and a second beam from the light source assembly, respectively, and then guide the homogenized beams to the prism assembly. The first and second beams have the same color, and in the first field of view of the illumination system, the light intensity of the first beam is less than that of the second beam; in the second field of view of the illumination system, the light intensity of the first beam is greater than that of the second beam. Thus, by homogenizing the beams using different light homogenizing assemblies, the light intensities of different beams are complementary in the same field of view, solving the problem of uneven illuminance of the beams after processing by the light homogenizing assembly in related technologies, and achieving the effect of improving the uniformity of illuminance provided by the illumination system.

[0081] Figure 13 This is a schematic diagram of a laser projector provided in an embodiment of this application. The laser projector 10 includes a projection lens 12 and an illumination system 11 as described in any of the above embodiments.

[0082] The light source component in the lighting system 11 may include at least one laser and a beam control component for providing a beam to the light homogenizing component.

[0083] In the lighting system 11, the light source assembly 111, the light homogenizing assembly 112, the prism assembly 113, and the light valve assembly 114 are arranged sequentially along the optical path. The light source assembly 111 guides the first light beam it provides to the first light homogenizing assembly 1121. The first light homogenizing assembly 1121 receives the first light beam from the light source assembly 111, optimizes the shape of the incident first light beam, homogenizes the beam, and then guides the processed beam to the first prism assembly 1131. After total internal reflection by the first prism assembly 1131, the first light beam is guided to the first light valve 1141. The first light valve 1141 receives the first light beam from the first prism assembly 1131 and guides it to the first prism assembly 1131 through reflection. The light beam is refracted by the first prism assembly 1131 and directed to the projection lens 12. The light source assembly 111 directs the second light beam it provides to the second homogenizing assembly 1122. The second homogenizing assembly 1122 is used to receive the second light beam from the light source assembly 111. It can optimize the shape of the incident second light beam and homogenize the beam, and then guide the beam to the second prism assembly 1132 after processing. The second light beam is refracted by the second prism assembly 1132 and then directed to the second light valve 1142. The second light valve 1142 is used to receive the second light beam from the second prism assembly 1132 and guide it to the second prism assembly 1132 through reflection. Then, the second light beam is processed by the second prism assembly 1132 and then directed to the projection lens 12.

[0084] In summary, the embodiments of this application provide an illumination system comprising a light source assembly, a light homogenizing assembly, a prism assembly, and a light valve assembly arranged sequentially along the optical path. The light homogenizing assembly includes a first light homogenizing assembly and a second light homogenizing assembly, which are used to homogenize a first beam and a second beam from the light source assembly, respectively, and then guide the homogenized beams to the prism assembly. The first and second beams have the same color, and in the first field of view of the illumination system, the light intensity of the first beam is less than that of the second beam; in the second field of view of the illumination system, the light intensity of the first beam is greater than that of the second beam. Thus, by homogenizing the beams using different light homogenizing assemblies, the light intensities of different beams are complementary in the same field of view, solving the problem of uneven illuminance of the beams after processing by the light homogenizing assembly in related technologies, and achieving the effect of improving the uniformity of illuminance provided by the illumination system.

[0085] In this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" means two or more, unless otherwise expressly defined.

[0086] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lighting system, characterized in that, The lighting system includes: a light source assembly, a light-diffusing assembly, a prism assembly, and a light valve assembly arranged sequentially along the light path; The light-uniforming component includes a first light-uniforming component and a second light-uniforming component. The first light-uniforming component is used to uniformly process a first light beam provided by the light source component and then guide it to the prism component. The second light-uniforming component is used to uniformly process a second light beam provided by the light source component and then guide it to the prism component. The prism component is used to guide the light beam received from the light-uniforming component to the light valve component. The first light beam and the second light beam have the same color, and the light intensity of the first light beam in the first field of view of the lighting system is less than the light intensity of the second light beam in the first field of view. The light intensity of the first light beam in the second field of view of the lighting system is greater than the light intensity of the second light beam in the second field of view.

2. The lighting system according to claim 1, characterized in that, The difference between the first superimposed light intensity and the second superimposed light intensity is less than a threshold. The first superimposed light intensity is the superimposed light intensity of the first beam and the second beam in the first field of view, and the second superimposed light intensity is the superimposed light intensity of the first beam and the second beam in the second field of view.

3. The lighting system according to claim 2, characterized in that, In any two fields of view of the lighting system, the difference in the superimposed light intensity of the first beam and the second beam is less than the threshold.

4. The lighting system according to claim 2, characterized in that, The light homogenizing component further includes a third light homogenizing component, which is used to homogenize the third beam provided by the light source component and then guide it to the prism component. The difference between the third superimposed light intensity and the fourth superimposed light intensity is less than a threshold. The third superimposed light intensity is the superimposed light intensity of the first beam, the second beam, and the third beam in the first field of view. The fourth superimposed light intensity is the superimposed light intensity of the first beam, the second beam, and the third beam in the second field of view.

5. The lighting system according to any one of claims 2-4, characterized in that, The threshold is positively correlated with the maximum light intensity in the field of view of the lighting system.

6. The lighting system according to claim 1, characterized in that, Both the first beam and the second beam are white light beams.

7. The lighting system according to claim 3, characterized in that, Both the first beam and the second beam are white light beams composed of a mixture of red, blue, and green light.

8. The lighting system according to any one of claims 1-7, characterized in that, The first light-diffusing component and the second light-diffusing component are light guides of different lengths.

9. The lighting system according to any one of claims 1-7, characterized in that, The first light-diffusing component and the second light-diffusing component are compound eye lenses with different numbers of compound eyes.

10. A laser projector, characterized in that, The laser projector includes the lighting system according to any one of claims 1-9.

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