CN220137537U

CN220137537U - Light source assembly, light emitting device and projection device

Info

Publication number: CN220137537U
Application number: CN202320299772.4U
Authority: CN
Inventors: 郭祖强; 顾佳琦; 储兆威; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2023-02-13
Filing date: 2023-02-13
Publication date: 2023-12-05
Anticipated expiration: 2033-02-13

Abstract

The embodiment of the utility model provides a light source assembly, which comprises a first light source, a second light source and a reflection scattering sheet, wherein the first light source comprises the scattering sheet and at least one light emitting device, the at least one light emitting device is arranged side by side with the scattering sheet, the light emitting device is used for emitting first light, the second light source is used for emitting second light, the reflection scattering sheet is arranged on a light path of the second light and used for reflecting the light emitted by the second light source to the scattering sheet so as to enable the first light and the second light to be emitted after being combined. The diffusion of the emergent light of the second light source is performed twice by using both the diffusion sheet and the reflection diffusion sheet in the light source assembly, so that the expansion of the emergent light of the second light source can be increased, and the emergent light of the second light source and the emergent light of the edge part of the first light source can be combined. The combined light beam of the first light source and the second light source can reach the subsequent light homogenizing component with larger illumination area, and the light homogenizing times of the light beam in the light homogenizing component are increased. The embodiment of the utility model also provides a light-emitting device and a projection device.

Description

Light source assembly, light emitting device and projection device

Technical Field

The present utility model relates to the field of light sources, and in particular, to a light source assembly, a light emitting device, and a projection device.

Background

The light sources of the current light emitting devices generally comprise LED light sources, RGB laser light sources and the like, and the LED light sources have the advantages of low cost, no speckles and the like, but have the defects of limited brightness, serious heat generation and the like. The RGB laser light source has the advantages of wide color gamut, high brightness and the like, but brings about the doubling of cost. To meet the user's demands for high brightness and wide color gamut and low cost light sources. In the related art, dual improvement of color gamut and brightness can be achieved by using a light combining device of a laser and an LED light source, while relatively reducing cost. The light combination scheme is that a reflection scattering sheet for laser combination is added in front of a light homogenizing device, so that an LED light beam and a laser light beam are coaxially incident into the light homogenizing device to realize light homogenizing. However, the laser emergent beam is concentrated, after diffuse reflection occurs through the reflection scattering sheet, the laser beam is still concentrated, and the LED beam at the position edge cannot be combined with the laser beam, so that the uniformity of the light source emergent beam is poor.

Disclosure of Invention

The embodiment of the utility model provides a light source assembly, a light emitting device and a projection device, so as to at least partially improve the technical problems.

In a first aspect, an embodiment of the present utility model provides a light source assembly, including a first light source, a second light source, and a reflective diffusion sheet, where the first light source includes a diffusion sheet and at least one light emitting element, the at least one light emitting element is arranged side by side with the diffusion sheet, the light emitting element is used for emitting a first light, the second light source is used for emitting a second light, and the reflective diffusion sheet is arranged on an optical path of the second light and is used for reflecting light emitted by the second light source to the diffusion sheet, so that the first light and the second light are emitted after being combined.

In one embodiment, the light source assembly further comprises a collection lens positioned in the path of the first light ray.

In one embodiment, the light emitting element is an LED light source and the second light source is a laser light source.

In one embodiment, the diffuser is located at the outer edge of the at least one light emitting element.

In one embodiment, the diffuser is located in the center of the at least one light emitting element.

In a second aspect, an embodiment of the present utility model provides a light emitting device, including a plurality of light source assemblies as described in the second aspect, and a light combining assembly, where the plurality of light sources emit light in different wavelength bands, and the light combining assembly is configured to combine emitted light in at least two different wavelength bands.

In one embodiment, the light combining component includes a first light combining component and a second light combining component, the first light combining component is located at a junction of the outgoing lights of at least two different wavebands and is used for combining the outgoing lights of at least two different wavebands, and the second light combining component is located at a junction of the outgoing lights of at least one and the outgoing lights of the first light combining component and is used for combining the outgoing lights of at least one different wavebands and the outgoing lights of the first light combining component.

In one embodiment, the light emitting device further comprises a light homogenizing component, a reflector and a prism, wherein the light homogenizing component and the prism are positioned on two sides of the reflector.

In one embodiment, a relay lens is disposed between the light homogenizing component and the reflector.

In a third aspect, an embodiment of the present utility model provides a projection apparatus including a light emitting device and a spatial light modulator as in the second aspect described above. The spatial light modulator is configured to receive and modulate illumination light emitted from the light emitting device to form image light.

According to the light source assembly, the light emitting device and the projection device provided by the embodiment of the utility model, the emergent light of the second light source is scattered twice by utilizing the scattering sheet and the reflection scattering sheet in the light source assembly, so that the expansion of the emergent light of the second light source can be increased, and the emergent light of the second light source can be combined with the emergent light of the edge part of the first light source. The light beam combining device has the advantages that the combined light beam of the first light source and the second light source can reach the subsequent light homogenizing component with larger illumination area, the light homogenizing times of the light beam in the light homogenizing component are increased, and the light combining effect of the light rays emitted by the light source components of the light emitting device is further improved. And the larger light combining area can also avoid that partial light beams at the edges of the light combining rays are not combined, so that the uniformity of the light emitting device is improved, and the projection quality of the projection device is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a projection apparatus according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a light source assembly according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a first light source according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of another first light source according to an embodiment of the present utility model.

Detailed Description

In order to make the present utility model better understood by those skilled in the art, the following description of the present utility model will be made in detail with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which a person skilled in the art would obtain without making any inventive effort, are within the scope of the utility model.

In the present utility model, the terms "mounted," "connected," "secured," and the like are to be construed broadly unless otherwise specifically indicated or defined. For example, the connection can be fixed connection, detachable connection or integral connection; can be mechanically or electrically connected; the connection may be direct, indirect, or internal, or may be surface contact only, or may be surface contact via an intermediate medium. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for understanding as a specific or particular structure. The description of the terms "some embodiments," "other embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In the present utility model, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples of the present utility model and features of various embodiments or examples may be combined and combined by those skilled in the art without contradiction.

In one aspect, light Emitting Diodes (LEDs) may be used to emit light in the projection apparatus, and LED light sources may be classified into two types, i.e., white LEDs with single color are used as light sources; and secondly, red, green and blue LEDs are used as light sources. However, a projector using an LED light source is generally referred to as an LED projector, and the overall structure of the projector is substantially the same as that of a conventional light source, for example, various LED light source structures such as an LED lamp (rgb LED) for three-primary color intersection imaging (DLP), and a Liquid Crystal On Silicon (LCOS). On the other hand, blue laser adopted in the projection device is combined with a fluorescent color wheel technology, namely, after single-beam blue laser passes through the treatment of exciting red, green and blue (white) four-color fluorescent powder and a color wheel, a certain value of red, green and blue three-color light or red, green, blue and white four-color light is formed, and then the red, green, blue and white four-color light is combined into the color required by people.

Examples

In an embodiment of the present utility model, referring to fig. 1, a projection apparatus 1 includes a light emitting device 10 and a spatial light modulator 20. The light emitting device 10 may be a device emitting a light beam in a specific direction, in order to ensure the projection quality of the projection device 1.

In this embodiment, the light emitting device 10 includes a plurality of light source assemblies 11 and a light combining assembly 12, the light source assemblies 11 emit light rays with different wavebands, and the light combining assembly 12 is used for combining the emitted light with at least two different wavebands. Specifically, referring to fig. 2, the light source assembly 11 includes a first light source 111, a second light source 112, and a reflective diffusion sheet 113, where the first light source 111 includes a diffusion sheet 1111 and at least one light emitting element 1112, and in one embodiment, the light emitting element 1112 may include a first light emitting element and a second light emitting element, and the first light emitting element and the second light emitting element are spaced apart to ensure normal operation of the first light source 111 in consideration of the light emitting element 1112 assembly technology and the diffusion problem.

With continued reference to fig. 2, the light emitting element 1112 is configured to emit a first light (as shown by the solid line in fig. 2), and the second light source 112 is configured to emit a second light (as shown by the dashed line in fig. 2), and in one embodiment, the light emitting element 1112 may employ an LED chip as the light emitting chip, so as to further reduce the production cost and speckle contrast of the light emitting element 1112 by using low cost and low coherence of the LED chip. However, the brightness of the outgoing light of the LED chip is affected by its own current carrying threshold, which results in limited brightness of the outgoing light of the light emitting element 1112. In contrast, a laser light source with high brightness and wide color gamut can solve the part of the difficulty faced by the LED chip, but the laser light source has high cost and cannot be popularized. The method of increasing the number of LED chips only to increase the brightness is also limited by the size of the light emitting element 1112 and the minimum layout density of the LED chips. The light emitting element 1112 may be an LED light source, and the second light source 112 may be a laser light source, so that the low-cost and high-quality light emitting device 10 is realized by combining the low-cost characteristics of the LED chip and the high-brightness characteristics of the laser light source.

The diffusion sheet 1111 is mainly used for diffusing light, the diffusion sheet 1111 may be quartz frosted glass, the diffusion sheet 1111 includes a frosted surface, the frosted surface may face the emitting direction of the light emitting element 1112, and part of the emitted light may pass through the frosted surface and be diffused, so as to homogenize the emitted light. By coating the reflective layer on the diffuser 1111 to form the reflective diffuser 113, the reflective diffuser 113 is disposed on the optical path of the second light, and the second light irradiates the reflective diffuser 113, so that diffuse reflection of the second light can be achieved by using the reflective diffuser 113, so as to increase the expansion of the reflective light of the reflective diffuser 113, increase the light combining area of the two light beams, and improve the light combining effect. The reflective diffusion sheet 113 is configured to reflect light emitted from the second light source 112 to the diffusion sheet 1111, and the light is scattered back to the periphery at the diffusion sheet 1111 again, and the at least one light emitting element 1112 may be disposed side by side with the diffusion sheet 1111, so that the scattered light of the second light contacts with the emitted light of the first light, and the first light and the second light are emitted after being combined. The expansion of the second light ray is increased, so that the light homogenizing range between the first light ray and the second light ray is increased.

In one embodiment, the light emitted from the light emitting element 1112 of the LED light source is relatively divergent, and the light may be emitted to the periphery. The light emitted from the second light source 112 is relatively concentrated, and the light of the edge portion of the first light beam opposite to the emitting direction of the light emitting element 1112 does not combine with the light of the second light beam, resulting in poor uniformity. Referring to fig. 3, the diffusion sheet 1111 is located at an outer edge of at least one light emitting element 1112, and the second light reaches the diffusion sheet 1111 to be diffused and combined with the first light, so as to improve the situation that the edge portion of the first light has poor or no light combining effect. The light homogenizing and modulating of the subsequent light rays are improved to a certain extent.

In another embodiment, the light emitting element 1112 may be a laser light source or the like that collects light beams, and the light beam at the axis portion of the first light beam corresponding to the emitting direction is concentrated, which is unfavorable for the light combination with the second light beam. Referring to fig. 4, the diffusion sheet 1111 is located at the center of the at least one light emitting element 1112, and a portion of the light of the first light is diffused by the diffusion sheet 1111 to enlarge the size of the light combining area so as to improve the subsequent light homogenizing effect. And the second light is emitted to the center of the light emitting element 1112, which is also beneficial to the combination of the second light and a large number of light beams at the center of the light emitting element 1112 to improve the light combining effect of the light source assembly 11.

In this embodiment, referring to fig. 2, the light source assembly 11 further includes a collecting lens 114, and the collecting lens 114 is located on the optical path of the first light. The collecting lens 114 may collect the first light, collect the first light emitted from the first light source 111 or the part of the light scattered around by the combined light of the first light source 111 and the second light source 112 on the axis of the light path of the first light, so as to collect the emitted light, increase the light intensity, and enhance the lighting effect. Preferably, it is necessary to ensure that the outgoing light is not affected by the internal components of the light source assembly 11, and the direction of the optical path of the outgoing light is the same as the axial direction of the collecting lens 114, so that the outgoing light can be smoothly emitted to the external environment.

In this embodiment, please continue to refer to fig. 1, the light combining component 12 can combine the light emitted from the light source components 11 and emit the combined light toward a predetermined direction. The subsequent independent control of parameters such as brightness of each light source component 11 is convenient, so that the emergent light of the light-emitting device 10 has better color expression, and the projection quality of the projection device 1 is further ensured. The light combining component 12 includes a first light combining component 121 and a second light combining component 122, where the first light combining component 121 is located at the junction of the outgoing light of at least two different wavebands and is used for combining the outgoing light of at least two different wavebands. In one embodiment, the light source assembly 11 includes a first light source assembly 31 and a second light source assembly 32, the first light source assembly 31 emitting light of a first wavelength band and the second light source assembly 32 emitting light of a second wavelength band. The first band and the second band may be the same band or different bands. The first light combining component 121 is located at the intersection of the light of the first wavelength band and the light of the second wavelength band. The light of the first wavelength band may be blue light and the light of the second wavelength band may be green light. The first light combining component 121 may be an optical element that transmits red, green and blue light, and reflects blue light emitted from the first light source component 31, and green light emitted from the second light source component 32 may transmit the first light combining component 121 and combine with blue light emitted from the second LED light source 30. Preferably, the light source assembly 11 further includes a fourth light source assembly 34, and reflects the blue light emitted from the fourth light source assembly 34 to the second light source assembly 32 by the first light combining assembly 121, and excites the second light source assembly 32 to emit green light.

The second light combining component 122 is located at the junction of the at least one outgoing light and the outgoing light of the first light combining component 121, and is used for combining the outgoing light of at least one different wavelength band and the outgoing light of the first light combining component 121. In one embodiment, the second light combining component 122 is located at the junction of the emergent light of the first light combining component 121 and the emergent light of the third light source component 33, the light of the third light source component 33 emergent light of the third wavelength band may be red light, the second light combining component 122 may be an optical element transmitting red, green and blue, the blue+green combined light emergent from the first light combining component 121 is reflected by the second light combining component 122, and the red light emergent from the third light source component 33 may directly transmit the second light combining component 122 and combine with the blue+green combined light emergent from the first light combining component 121 again. Light combination among emergent lights of different wavebands is realized, light loss caused by a light combination mechanism is reduced, and brightness is increased.

With reference to fig. 1, the light emitting device 10 further includes a light homogenizing component 41, a reflecting mirror 42, and a prism 43, where the light homogenizing component 41, the reflecting mirror 42, and the prism 43 are disposed on the light path of the outgoing light of the second light combining component 122. And the light homogenizing unit 41, the reflecting mirror 42 and the prism 43 are arranged in this order according to the direction of the light emitted from the second light combining unit 122. The light homogenizing component 41 and the prism 43 are positioned at two sides of the reflecting mirror 42, and the light homogenizing component 41 can uniformly distribute the combined light emitted by the light combining component 12. The dodging component 41 may be a compound eye, a square bar, or the like, and is not limited in this embodiment. And a relay lens 44 may be disposed between the dodging component 41 and the reflecting mirror 42, and the relay lens 44 may transmit the outgoing light of the dodging component 41 to the reflecting mirror 42. The reflecting mirror 42 can adjust the outgoing position of the light, and the outgoing light passes through the reflecting mirror 42 to the prism 43, and is reflected to the subsequent spatial light modulator 20 through the prism 43. The prism 43 may be a total internal reflection prism (Total Internal Reflection quanneifanshe, TIR) or the like.

The spatial light modulator 20 is a device for modulating the optical field distribution of light waves, and is widely used in various fields of application such as optical information processing, beam conversion, and output display. With continued reference to fig. 2, the spatial light modulator 20 is configured to receive and modulate the illumination light emitted from the prism 43 to form image light. The spatial light modulator 20 reemitts the image light onto the prism 43, and the image light continues to propagate through the prism 43. In one embodiment, the prism 43 emits a light beam toward a certain preset direction, and the emitted light beam is an illumination light beam. The spatial light modulator 20 is disposed on the optical path of the outgoing light, and the spatial light modulator 20 includes a plurality of individual units (individual optical units) that are spatially arranged in a one-dimensional or two-dimensional array. Each unit can be independently controlled by an optical signal or an electrical signal, and the optical characteristics of the unit can be changed by utilizing various physical effects (a Pockels effect, a Kerr effect, an acousto-optic effect, a magneto-optic effect, a semiconductor self-electro-optic effect or a photorefractive effect and the like), so that illumination light beams which illuminate in a plurality of independent units are modulated, and image light beams are output. In this embodiment, the spatial light modulator 20 may be a digital micro-mirror device (DMD), a liquid-crystal-on-silicon panel (lco panel), a transmissive liquid crystal panel, or the like.

In this embodiment, please continue to refer to fig. 1, the projection apparatus 1 further includes an optical lens 45, and the optical lens 45 is located on a side of the prism 43 away from the spatial light modulator 20. The optical lens 45 includes, but is not limited to, a plurality of lens combinations, etc., and the optical lens 45 may receive the image light emitted from the prism 43 and further adjust optical parameters of the emitted light from the prism 43.

In the embodiment of the utility model, the light source assembly 11, the light emitting device 10 and the projection device 1 are provided, and the light emitted by the second light source 112 is scattered twice by using the scattering sheet 1111 and the reflective scattering sheet 113 in the light source assembly 11, so that the expansion of the light emitted by the second light source 112 can be increased, so that the light emitted by the second light source 112 can be combined with the light emitted by the edge portion of the first light source 111. The combined light beam of the first light source 111 and the second light source 112 can have a larger illumination area to reach the subsequent light homogenizing component 41, so as to increase the number of times of light homogenizing of the light beam in the light homogenizing component 41, and further improve the combined light effect of the light rays emitted by the light source components 11 of the light emitting device 10. The larger light combining area can also avoid that partial light beams at the edges of the two light combining rays are not combined, so that the uniformity of the light emitting device 10 is improved, and the projection quality of the projection device 1 is ensured.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting thereof; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and they should be included in the protection scope of the present utility model.

Claims

1. A light source assembly, comprising:

the light source comprises a first light source, a second light source and a first light source, wherein the first light source comprises a diffusion sheet and at least one light-emitting element, the at least one light-emitting element is arranged side by side with the diffusion sheet, and the light-emitting element is used for emitting first light;

the second light source is used for emitting second light; and

the reflection scattering sheet is arranged on the optical path of the second light and used for reflecting the light emitted by the second light source to the scattering sheet so that the first light and the second light are emitted after being combined.

2. The light source assembly of claim 1, further comprising a collection lens positioned in the optical path of the first light ray.

3. The light source assembly of claim 1, wherein the light emitting element is an LED light source and the second light source is a laser light source.

4. The light source assembly of claim 1, wherein the diffuser is positioned at an outer edge of the at least one light emitting element.

5. The light source assembly of claim 1, wherein the diffuser is centered on the at least one light emitting element.

6. A light emitting device, comprising:

a plurality of light source modules according to any one of claims 1-5, wherein a plurality of said light sources emit light in different wavelength bands;

and the light combination component is used for combining the emergent light of at least two different wave bands.

7. The light emitting device of claim 6, wherein the light combining assembly comprises a first light combining assembly and a second light combining assembly, the first light combining assembly is positioned at a junction of at least two different wavelength bands of outgoing light for at least two different wavelength bands of outgoing light, and the second light combining assembly is positioned at a junction of at least one of the outgoing light and the outgoing light of the first light combining assembly for at least one different wavelength band of outgoing light and the outgoing light of the first light combining assembly.

8. The light emitting device of claim 6, further comprising a light homogenizing assembly, a mirror, and a prism, wherein the light homogenizing assembly and the prism are positioned on both sides of the mirror.

9. The light emitting apparatus of claim 8, wherein a relay lens is disposed between the light homogenizing assembly and the reflector.

10. A projection apparatus, comprising:

the light-emitting device according to any one of claims 6 to 9; and

and a spatial light modulator for receiving and modulating the illumination light emitted from the light emitting device to form image light.