CN219811121U

CN219811121U - Projection system

Info

Publication number: CN219811121U
Application number: CN202320734307.9U
Authority: CN
Inventors: 胡飞; 杨佳翼; 侯海雄; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2023-03-30
Filing date: 2023-03-30
Publication date: 2023-10-10
Anticipated expiration: 2033-03-30

Abstract

The application relates to the technical field of projection display, and discloses a projection system, which comprises a plurality of luminous components and a plurality of lens components; each light-emitting component comprises a light-emitting element, a first fluorescent layer and a red light generation mechanism; the light emitting element is configured to emit excitation light; the first fluorescent layer is arranged on the surface of the light-emitting element and is configured to be excited by at least part of excitation light to generate laser; the red light generating mechanism is arranged around the light emitting element or on the surface of the first fluorescent layer and is configured to generate red light; the first light emergent surface of the red light generating mechanism and the first light emergent surface of the first fluorescent layer have gradient difference; each light-emitting component corresponds to a lens component, and the lens component is arranged on an emergent light path of the corresponding light-emitting component and is configured to form a virtual image for red light. Through the mode, better mixing of the red light and the mixed light is realized, and the uniformity problem caused by the red supplementing light is also improved.

Description

Projection system

Technical Field

The present application relates to the field of projection display technologies, and in particular, to a projection system.

Background

One way of generating white light by a light source module of a projection system is to mix a red LED chip, a blue LED chip and a green LED chip to generate white light by using a principle of three primary colors (RGB), and the white light generated by the way has the condition of insufficient red light, but the uniformity of the light source is poor although the red light duty ratio can be improved by increasing the number of the red LED chips in the prior art, and in the use process, the whole light source module is invalid as long as one LED chip is damaged, thereby affecting the use of the projection system.

Another way to generate white light is to set yellow fluorescent powder on the light emitting surface of the blue LED, and the yellow light generated after the yellow fluorescent powder is excited is complementary with the rest blue light to generate white light. However, the lack of red radiation in the white light spectrum obtained in this way results in a lower color rendering index of the light source, which affects the application of the projection system. In the prior art, the red duty ratio can be improved by adding a red LED chip, but the uniformity of the light source is poor.

Disclosure of Invention

Based on this, the present utility model provides a projection system that improves the uniformity of light in the projection system.

In order to solve the technical problems, the utility model adopts a technical scheme that: providing a projection system comprising a plurality of light emitting assemblies and a plurality of lens assemblies; each light emitting component comprises a light emitting element, a first fluorescent layer and a red light generating mechanism; the light emitting element is configured to emit excitation light; the first fluorescent layer is arranged on the surface of the light-emitting element and is configured to generate laser after being excited by at least part of the excitation light; the red light generating mechanism is arranged around the light emitting element or on the surface of the first fluorescent layer and is configured to generate red light; the first light emergent surface of the red light generating mechanism and the first light emergent surface of the first fluorescent layer have gradient differences; each light-emitting component corresponds to one lens component, and the lens components are arranged on the emergent light paths of the corresponding light-emitting components and are configured to form virtual images for the red light.

In the above technical scheme, by setting the gradient difference between the first light emitting surface of the first fluorescent layer and the first light emitting surface of the red light generating mechanism, the mixed light formed by the excitation light emitted by the light emitting element and the laser light generated by the fluorescent layer can be formed into a real image by the lens component to the red light on the light path, thereby realizing better mixing of the mixed light and the red light and improving the uniformity problem caused by the red light supplement.

In one of the embodiments, the lens assembly includes a collection lens element, and a plurality of the collection lens elements are located on the same plane.

In the above technical scheme, the lens assembly comprises the collecting lens elements, and the collecting lens elements are positioned on the same plane, so that the light emitted by the light emitting assemblies in different directions can be collected as much as possible, and the light utilization efficiency is improved.

In one embodiment, the red light generating mechanism includes a second fluorescent layer configured to generate the red light after being excited by at least a portion of the excitation light; the size of the second fluorescent layer is smaller than that of the first fluorescent layer, and the second fluorescent layer is arranged in the central area of the first light-emitting surface of the first fluorescent layer.

In the technical scheme, the second fluorescent layer with small size is arranged on the first light-emitting surface of the first fluorescent layer, so that gradient difference exists between the first fluorescent layer and the first light-emitting surface of the second fluorescent layer, and further, red light can be mixed into mixed light, and the method is simple and low in cost; by providing the second fluorescent layer in the central region of the first light-emitting surface of the first fluorescent layer, the spots of the real image and the virtual image can be overlapped as much as possible, and the red light can be mixed into the mixed light better.

In one embodiment, the red light generating mechanism includes a second fluorescent layer configured to generate the red light after being excited by at least a portion of the excitation light; the second fluorescent layer is arranged on the first light-emitting surface of the first fluorescent layer, and the second fluorescent layer is provided with a through hole extending along the thickness direction of the second fluorescent layer, so that part of the first light-emitting surface of the first fluorescent layer is exposed through the through hole.

In the above technical scheme, the second fluorescent layer with the through hole is arranged on the first light emitting surface of the first fluorescent layer, red light can be generated around the mixed light, when the mixed light and the red light act through the lens component, an image formed by the mixed light is a real image, and an image formed by the red light is an amplified virtual image, so that good mixing of light spots of the mixed light and the red light is realized, and uniform emitting of light is realized while red light is supplemented finally.

In one of the technical schemes, the red light generating mechanism includes a plurality of second fluorescent layers, the plurality of second fluorescent layers are configured to generate the red light after being excited by at least part of the excitation light, and the plurality of second fluorescent layers are arranged in a central area of the first light emitting surface of the first fluorescent layer.

In the technical scheme, the plurality of second fluorescent layers are arranged in the central area of the first light-emitting surface of the first fluorescent layer, so that the production process is simple and the cost is low.

In one embodiment, the red light generating mechanism includes four second fluorescent layers configured to generate the red light after being excited by at least a portion of the excitation light; the first light-emitting surface of the first fluorescent layer is rectangular, and four corners of the first light-emitting surface of the first fluorescent layer are respectively provided with the second fluorescent layer.

In the above technical scheme, the second fluorescent layers are respectively arranged at the four corners of the first light-emitting surface of the first fluorescent layer, so that the emitted red light is symmetrically arranged around the mixed light, when the mixed light and the red light pass through the lens component, the image formed by the mixed light is a real image, and the image formed by the red light is an amplified virtual image, so that the light spots of the mixed light and the red light are well mixed, the red light is supplemented, and the uniform emission of the light is realized.

In one of the technical schemes, the light emitting element is a blue LED chip, the first fluorescent layer is a yellow fluorescent layer, and the second fluorescent layer is a red fluorescent layer.

In the technical scheme, the light-emitting element is the blue LED chip, the first fluorescent layer is the yellow fluorescent layer and the second fluorescent layer is the red fluorescent layer, so that the first fluorescent layer can be excited by part of blue excitation light to generate excitation light, the excitation light can be mixed with the rest of blue excitation light to generate white light, and the second fluorescent layer is excited by part of blue excitation light to generate red light, and the white light is supplemented with red light.

In one embodiment, the red light generating mechanism comprises at least one mini-LED configured to emit the red light; the light-emitting element comprises a first side surface, a second side surface, a third side surface and a fourth side surface which are perpendicular to a first light-emitting surface of the light-emitting element and are sequentially connected; the at least one mini-LED is disposed adjacent at least one of the first side, the second side, the third side, and the fourth side.

According to the technical scheme, the mini-LED capable of emitting red light is arranged on the side face of the light-emitting element, so that gradient difference exists between the first light-emitting surface of the first fluorescent layer and the first light-emitting surface of the mini-LED, a real image can be generated after the mixed light acts through the lens assembly, and a virtual image is generated after the red light acts through the lens assembly, and therefore the mixed light and the red light are mixed better, and the method is simple and low in cost.

In one of the technical schemes, the red light generating mechanism comprises four mini-LEDs, and the four mini-LEDs are respectively arranged on one side of the first side face, one side of the second side face, one side of the third side face and one side of the fourth side face.

In the above technical solution, by arranging a mini-LED for emitting red light on each of four sides of the light emitting element, the emitted red light can be symmetrically arranged around the mixed light, and when the mixed light and the red light pass through the lens assembly, the mixed light forms a real image, and the red light forms an amplified virtual image, so that the light spots of the real image and the virtual image overlap as much as possible, and better light mixing of the red light and the mixed light is realized.

In one of the technical schemes, the red light generating mechanism comprises six mini-LEDs, wherein two mini-LEDs are arranged adjacent to the first side face, two mini-LEDs are arranged adjacent to the third side face, one mini-LED is arranged adjacent to the second side face, and one mini-LED is arranged adjacent to the fourth side face.

In the above technical solution, two mini-LEDs emitting red light are respectively disposed adjacent to two opposite sides of the light emitting element, and one mini-LED emitting red light is disposed adjacent to two opposite sides of the light emitting element, so that the emitted red light can be symmetrically disposed around the mixed light, and more mini-LEDs can generate more red light, so that the red duty ratio can be improved.

In one of the technical schemes, the red light generating mechanism comprises eight mini-LEDs, and two mini-LEDs are respectively arranged on one side of the first side face, the second side face, the third side face and the fourth side face.

In the above technical solution, two mini-LEDs emitting red light are respectively disposed at one side of four sides of the light emitting element, so that the emitted red light can be symmetrically disposed around the mixed light, and more mini-LEDs can generate more red light, so that the red duty ratio can be improved.

In order to solve the technical problems, the application adopts a technical scheme that: the projection system comprises a light source module and a lens assembly, wherein the light source module comprises a light source array, a fluorescent layer and a red light generating mechanism; the light source array is configured to emit excitation light, the fluorescent layer is arranged on at least part of the surface of the light source array and configured to generate laser light after being excited by at least part of the excitation light, and the red light generating mechanism is arranged around the light source array or on the surface of the fluorescent layer and configured to generate red light; the first light emergent surface of the red light generating mechanism and the first light emergent surface of the fluorescent layer have gradient difference; the lens component is arranged on an emergent light path of the light source module and is configured to form a virtual image for the red light.

In the technical scheme, the first light-emitting surface of the fluorescent layer and the first light-emitting surface of the red light generation mechanism are provided with gradient differences, so that the lens assembly can form a real image of mixed light consisting of excitation light emitted by the light source array and laser light generated by the fluorescent layer into a virtual image of red light on the light path, thereby realizing better mixing of the mixed light and the red light and improving the uniformity problem caused by red light supplement; the fluorescent layer is arranged on at least part of the surface of the light source array, and compared with the fluorescent layer arranged on each light-emitting element, the preparation method is simple and easy to operate.

In one embodiment, the red light generating mechanism includes a second fluorescent layer configured to generate the red light after being excited by at least a portion of the excitation light; the size of the second fluorescent layer is smaller than that of the fluorescent layer, and the second fluorescent layer is arranged in the central area of the first light-emitting surface of the fluorescent layer.

In the technical scheme, the second fluorescent layer with small size is arranged on the first light-emitting surface of the fluorescent layer, so that gradient difference exists between the fluorescent layer and the first light-emitting surface of the second fluorescent layer, and further, the red light can be mixed into the mixed light better, and the method is simple and low in cost.

In one embodiment, the red light generating mechanism includes a second fluorescent layer configured to generate the red light after being excited by at least a portion of the excitation light; the second fluorescent layer is arranged on the first light-emitting surface of the fluorescent layer, and the second fluorescent layer is provided with a through hole extending along the thickness direction of the second fluorescent layer, so that part of the first light-emitting surface of the fluorescent layer is exposed through the through hole.

In the above technical scheme, the second fluorescent layer with the through hole is arranged on the first light emitting surface of the fluorescent layer, red light can be generated around the mixed light, when the mixed light and the red light act through the lens component, an image formed by the mixed light is a real image, and an image formed by the red light is an amplified virtual image, so that good mixing of light spots of the mixed light and the red light is realized, and uniform emitting of light is realized while red light is finally supplemented.

In one of the technical schemes, the red light generating mechanism includes a plurality of second fluorescent layers, the plurality of second fluorescent layers are configured to generate the red light after being excited by at least part of the excitation light, and the plurality of second fluorescent layers are arranged in the central area of the first light emitting surface of the fluorescent layers.

In the technical scheme, the plurality of second fluorescent layers are arranged in the central area of the first light-emitting surface of the fluorescent layer, so that the production process is simple and the cost is low.

In one embodiment, the red light generating mechanism includes four second fluorescent layers configured to generate the red light after being excited by at least a portion of the excitation light; the first light-emitting surface of the fluorescent layer is rectangular, and four corners of the first light-emitting surface of the fluorescent layer are respectively provided with the second fluorescent layer.

In the above technical scheme, the second fluorescent layers are respectively arranged at the four corners of the first light-emitting surface of the fluorescent layer, so that the emitted red light is symmetrically arranged around the mixed light, when the mixed light and the red light pass through the lens component, the image formed by the mixed light is a real image, and the image formed by the red light is an amplified virtual image, thereby realizing good mixing of light spots of the mixed light and the red light, and finally realizing uniform emission of the light while supplementing the red light.

In one embodiment, the red light generating mechanism comprises at least one mini-LED configured to emit the red light; the light source array comprises a first side face, a second side face, a third side face and a fourth side face which are perpendicular to a first light-emitting face of the light source array and are sequentially connected; at least one of the mini-LEDs is disposed adjacent at least one of the first side, the second side, the third side, and the fourth side.

According to the technical scheme, the mini-LEDs capable of emitting red light are adjacently arranged on the side surfaces of the light-emitting elements, so that gradient difference exists between the first light-emitting surface of the fluorescent layer and the first light-emitting surface of the mini-LEDs, and further, the mixed light can generate a real image after being acted by the lens assembly, and the red light can generate a virtual image after being acted by the lens assembly, so that the mixed light and the red light can be better mixed, and the method is simple and low in cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

FIG. 1 is a schematic diagram of a projection system according to embodiment 1;

FIG. 2 is a schematic diagram of a light emitting device and a substrate according to some embodiments of the present application;

FIG. 3 is a light path diagram of a light emitting assembly according to some embodiments of the present application;

FIG. 4 is a schematic diagram of a first fluorescent layer and a red light generating mechanism according to some embodiments of the present application;

FIG. 5 is a schematic diagram of a first fluorescent layer and a red light generating mechanism according to other embodiments of the present application;

FIG. 6 is a schematic diagram of a first fluorescent layer and a red light generating mechanism according to other embodiments of the present application;

FIG. 7 is a schematic diagram of a first fluorescent layer and a red light generating mechanism according to other embodiments of the present application;

FIG. 8 is a schematic diagram of a first fluorescent layer and a red light generating mechanism according to other embodiments of the present application;

FIG. 9 is a schematic diagram of a light emitting assembly according to other embodiments of the present application;

FIG. 10 is a schematic diagram of a projection system according to embodiment 2 of the present application;

FIG. 11 is a schematic illustration of a phosphor layer and red light generating mechanism provided in some embodiments of the present application;

FIG. 12 is a schematic view of a phosphor layer and a red light generating mechanism according to other embodiments of the present application;

FIG. 13 is a schematic view of a phosphor layer and a red light generating mechanism according to other embodiments of the present application;

FIG. 14 is a schematic view of a phosphor layer and a red light generating mechanism according to further embodiments of the present application;

FIG. 15 is a schematic view of a phosphor layer and a red light generating mechanism according to other embodiments of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Based on the technical problems mentioned in the background art, the inventor of the present application uses a manner that a gradient difference exists between a first light-emitting surface emitting red light and a first light-emitting surface emitting white light, and on a light path, a focusing lens is used to form a real image of the white light to form a virtual image of the red light, so that better mixing of the white light and the red light is realized. The technical scheme provided by the application can give consideration to the luminous efficiency of the white light to the greatest extent, and increase the red light while not affecting the luminous quantity of the white light, thereby improving the uniformity problem caused by the red light supplement. The following description is made with reference to the accompanying drawings.

Example 1

Referring to fig. 1-3, some embodiments of the present application provide a projection system 1, wherein the projection system 1 includes a plurality of light emitting assemblies 10, a plurality of lens assemblies 20, a light modulation device 30, and a lens 40.

Specifically, in some embodiments, referring to fig. 2, the light emitting assembly 10 includes a light emitting element 11, a first fluorescent layer 12, and a red light generating mechanism 13.

Wherein the light emitting element 11 is configured to emit excitation light. In some embodiments, the Light Emitting element 11 may be an Organic Light-Emitting Diode (OLED) or an inorganic Light-Emitting Diode (LED), and may be specifically selected according to practical needs. The first light emitting surface of the light emitting element 11 is rectangular, and further, the first light emitting surface of the light emitting element 11 is square. Further, in some embodiments, the projection system 1 may further include a substrate 200, and the plurality of light emitting assemblies 10 are disposed on the substrate 200. In one embodiment, the substrate 200 is an aluminum plate, and further, the substrate 200 may have a polished surface or the substrate 200 may have a reflective film configured to reflect light emitted from the plurality of light emitting elements 11 toward the substrate 200, so that on one hand, the light utilization rate may be improved, and on the other hand, the generation of stray light in the projection system 1 may be reduced, thereby improving the display effect. The first light-emitting surface of the light-emitting element 11 is parallel to the light-emitting surface of the substrate 200.

The first fluorescent layer 12 is disposed on the surface of the light emitting element 11, and is configured to generate a lasing light after being excited by at least part of the excitation light, and the lasing light can be mixed with the rest of the excitation light to generate mixed light. Further, in some embodiments, the mixed light is white light, and the color of the first fluorescent layer 12 is related to the color of the excitation light emitted by the light emitting element 11, and the two colors are usually complementary colors, that is, white light is generated after mixing. For example, in some embodiments, the light emitting element 11 is a blue LED chip, and the excitation light emitted by the light emitting element is blue, and then the first fluorescent layer 12 is a yellow fluorescent layer, and the first fluorescent layer 12 receives a part of the excitation light of the blue excitation light and mixes with a part of the rest of the blue excitation light to generate white light. In other embodiments, other complementary color light emitting elements 11 and first phosphor layers 12 may be used, as the application is not limited in this regard. In addition, white light can be generated by combining an ultraviolet light or ultraviolet light LED chip and an RGB fluorescent layer.

The red light generating mechanism 13 is disposed around the light emitting element 11 or on the surface of the first fluorescent layer 12, and is configured to generate red light, and the first light emitting surface of the red light generating mechanism 13 and the first light emitting surface of the first fluorescent layer 12 have a gradient difference, that is, the first light emitting surface of the red light generating mechanism 13 and the first light emitting surface of the first fluorescent layer 12 are not on the same plane, in the present application, the two surfaces have a "gradient difference" which means that the two surfaces are approximately parallel and are not on the same plane along the direction perpendicular to the two surfaces, so that the mixed light can form a real image 50 after passing through the lens assembly 20, and the red light forms an amplified virtual image 60 after passing through the lens assembly 20. Wherein the first light emitting surface of the red light generating mechanism 13 is parallel to the light emitting surface of the substrate 200; the first light emitting surface of the first fluorescent layer 12 is parallel to the light emitting surface of the substrate 200.

Specifically, the red Light generating mechanism 13 refers to an element capable of Emitting red Light, which may be a self-luminous element or an element capable of generating red Light by excitation, wherein the self-luminous element may be a sub-millimeter Light-Emitting Diode (Mini LED) or a Micro Light-Emitting Diode (Micro LED), and the like, and the element capable of generating red Light by excitation may be a second fluorescent layer configured to generate red Light after excitation by at least part of the excitation Light, and in some embodiments, the second fluorescent layer is a red fluorescent layer. In the embodiment of the present application, the first light emitting surface of the red light generating mechanism 13 and the first light emitting surface of the first fluorescent layer 12 have a gradient difference, so that on the light path, please refer to fig. 3, the lens assembly 20 is used to form a real image 50 of white light (mixed light) and a virtual image 60 of red light, thereby realizing better mixing of white light and red light, and improving the uniformity problem caused by red light supplement.

The following will describe the cases where the red light generating mechanism 13 is a self-luminous element and an element excited to generate red light, respectively.

In some embodiments, referring to fig. 4-6, the red light generating mechanism 13 is a second fluorescent layer 130, the second fluorescent layer 130 is disposed on the first light-emitting surface of the first fluorescent layer 12, and the size of the second fluorescent layer 130 is smaller than that of the first fluorescent layer 12. In the present application, the "the size of the second fluorescent layer 130 is smaller than that of the first fluorescent layer 12" means that the size of the first light-emitting surface of the second fluorescent layer 130 is smaller than that of the first light-emitting surface of the first fluorescent layer 12, and further, the length and the width of the first light-emitting surface of the second fluorescent layer 130 are respectively smaller than that of the first light-emitting surface of the first fluorescent layer 12, so that a part of the first light-emitting surface of the first fluorescent layer 12 is exposed. The number of the second fluorescent layers 130 is not limited, and may be, for example, 1, 2, 3, or 4, and no matter how many second fluorescent layers 130 are disposed on the first light-emitting surface of the first fluorescent layer 12, at least a portion of the first light-emitting surface of the first fluorescent layer 12 is exposed, so that a gradient difference exists between the first light-emitting surface of the first fluorescent layer 12 and the first light-emitting surface of the second fluorescent layer 130. In some embodiments, the second fluorescent layer 130 is uniformly distributed on the first light-emitting surface of the first fluorescent layer 12, so that the emitted red light is symmetrically disposed around the white light, when the white light and the red light pass through the lens assembly 20, the white light forms a real image 50, and the red light forms an enlarged virtual image 60, so that the light spots of the two images are well mixed, and the uniform emission of the light is realized while the red light is supplemented.

In some embodiments, referring to fig. 4, the red light generating mechanism 13 includes only a second fluorescent layer 130, and the center of the second fluorescent layer 130 is substantially aligned with the center of the first fluorescent layer 12 along the direction perpendicular to the first light emitting surface of the first fluorescent layer 12, so that the second fluorescent layer 130 is located in the central area of the first fluorescent layer 12, so that the light spots of the real image 50 and the virtual image 60 can be overlapped as much as possible, and better mixing of red light and white light is achieved. Because the center of the second fluorescent layer 130 may not be exactly aligned with the center of the first fluorescent layer 12 due to the installation error, as long as the orthographic projection of the center region of the second fluorescent layer 130 and the center region of the first fluorescent layer 12 along the direction perpendicular to the first light-emitting surface of the first fluorescent layer 12 at least partially overlaps, "center region" means at least a partial region including the center, corresponding to the edge region, not a point, and the ratio of the area of the center region to the projected area thereof is greater than or equal to 40% and less than or equal to 90%; further, in some embodiments, the area of the central region is greater than or equal to 50% and less than or equal to 80% of its projected area; still further, in some embodiments, the area of the central region is greater than or equal to 60% and less than or equal to 70% of its projected area; the "front projection" in the present application refers to a projection along a direction perpendicular to the first light-emitting surface of the light-emitting element 11.

Alternatively, in other embodiments, referring to fig. 5, the second fluorescent layer 130 has a through hole 131 extending along the thickness direction of the second fluorescent layer 130, so that a portion of the first light emitting surface of the first fluorescent layer 12 is exposed through the through hole 131, and the shape of the through hole 131 is not limited to be circular, rectangular, square, polygonal, etc. By the arrangement, red light can be generated around the white light, when the white light and the red light act through the lens assembly 20, the white light emitted by the first fluorescent layer 12 forms a real image 50, and the red light emitted by the second fluorescent layer 130 forms an amplified virtual image 60, so that the light spots of the white light and the red light are well mixed, and the uniform emission of light is realized while the red light is supplemented.

Alternatively, in other embodiments, the red light may be generated around the white light by providing four second fluorescent layers 130. Specifically, referring to fig. 6, the red light generating mechanism 13 includes four second fluorescent layers 130, and the four corners of the first light emitting surface of the first fluorescent layer 12 are respectively provided with one second fluorescent layer 130.

Optionally, in other embodiments, the red light generating mechanism 13 includes a plurality of second fluorescent layers 130, where the plurality of second fluorescent layers 130 are configured to generate red light after being excited by at least part of the excitation light, and the plurality of second fluorescent layers 130 are disposed in a central area of the first light emitting surface of the first fluorescent layer 12, and by disposing the plurality of second fluorescent layers 130 in the central area of the first light emitting surface of the first fluorescent layer 12, the manufacturing process is simple and the cost is low.

In some embodiments, referring to fig. 7-8, the red light generating mechanism 13 may be mini-LEDs 132 that emit red light, and the number of mini-LEDs 132 may not be limited to 1, 2, 3, 4, 5, 6, 7, 8, etc. In some embodiments, the mini-LEDs 132 are uniformly dispersed around the light emitting element 11. In some embodiments, the light emitting element 11 is in a cuboid structure or a cube structure, and the light emitting element 11 includes a first side, a second side, a third side, and a fourth side that are perpendicular to the first light emitting surface of the light emitting element 11 and sequentially connected. The at least one mini-LED132 may be disposed adjacent at least one of the first side, the second side, the third side, and the fourth side. In this way, the first light emitting surface of the first fluorescent layer 12 and the first light emitting surface of the mini-LED132 can have a gradient difference, so that the real image 50 of the white light 80 and the virtual image 60 of the red light 70 are formed by the lens assembly 20 in the light path, as shown in fig. 9, so that the white light 80 and the red light 70 can be better mixed, and the method is simple and has low cost.

To achieve a more uniform mixing of the red light 70 and the white light 80, in some embodiments, referring to fig. 7, the red light generating mechanism 13 includes four mini-LEDs 132, the four mini-LEDs 132 being disposed on one side of the first, second, third, and fourth sides of the light emitting element 11, respectively; alternatively, in other embodiments, referring to FIG. 8, the red light generating mechanism 13 includes six mini-LEDs 132, wherein two mini-LEDs 132 are disposed adjacent to a first side of the light emitting element 11, wherein two mini-LEDs 132 are disposed adjacent to a third side of the light emitting element 11, wherein one mini-LED132 is disposed adjacent to a second side of the light emitting element 11, and wherein one mini-LED132 is disposed adjacent to a fourth side of the light emitting element 11. Alternatively, in other embodiments, the red light generating mechanism 13 includes eight mini-LEDs 132, and two mini-LEDs 132 are disposed on each of the first, second, third, and fourth sides of the light emitting element 11.

In this way, the emitted red light 70 can be symmetrically arranged around the white light 80, when the white light 80 and the red light 70 act through the lens assembly 20, the image formed by the white light 80 is the real image 50, and the image formed by the red light 70 is the amplified virtual image 60, so that the light spots of the real image 50 and the virtual image 60 are overlapped as much as possible, and better light mixing of the red light 70 and the white light 80 is realized; while more mini-LEDs 132 may produce more red light 70, which may increase the red duty cycle.

In some embodiments, referring to fig. 1, the lens assembly 20 may include a plurality of collecting lens elements 21, the plurality of collecting lens elements 21 are located on the same plane, and each light emitting assembly 10 may correspond to one collecting lens element 21, that is, the plurality of light emitting assemblies 10 and the plurality of collecting lens elements 21 are disposed in a one-to-one correspondence, and the collecting lens elements 21 are disposed on the outgoing light paths of the corresponding light emitting assemblies 10 and configured to collect the light emitted by the light emitting elements 11. The collecting lens element 21 can collect the light emitted from the light emitting component 10 in different directions as much as possible, so as to improve the utilization efficiency of the light emitted from the light emitting component 10, avoid the waste of energy, reduce the generation of astigmatism, improve the display effect and reduce the generation of heat. It should be noted that, the arrangement of the plurality of components and the plurality of components in the present application in a one-to-one correspondence manner means that at least a partial area of the orthographic projection of each component and the corresponding component onto the light emitting component 10 coincides along the direction perpendicular to the light emitting surface of the light emitting component 10, and due to the influence of a process error, deviation occurs when the two components are correspondingly installed, so long as a majority of the area of the orthographic projection of each component and the corresponding component onto the light emitting component 10 coincides, for example, more than 50% of the area coincides, the two components can be considered to be correspondingly arranged, specifically, the area of the overlapping area may occupy 55%,60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 100% of the area of one component.

Further, the lens assembly 20 may further include a plurality of collimating lens elements 22, where the plurality of collimating lens elements 22 are located on the same plane, and each light emitting assembly 10 may correspond to one collimating lens element 22, that is, the plurality of light emitting assemblies 10 and the plurality of collimating lens elements 22 are disposed in a one-to-one correspondence manner, and the collimating lens elements 22 are disposed on an outgoing light path of the corresponding light emitting assembly 10, further, on an outgoing light path of the corresponding collecting lens element 21, and are configured to convert a light beam emitted by the light emitting assembly 10 and having a certain divergence angle into collimated light. "collimated light" as used herein refers to parallel or nearly parallel rays of light, and the output of the collimating lens element 22 allows as much illumination light as possible to be utilized.

The light modulation device 30 is disposed on the outgoing light path of the plurality of lens assemblies 20, and is configured to convert outgoing light, i.e., mixed light of white light and red light, outgoing from the plurality of lens assemblies 20 into imaging light. The light modulation device 30 may be a liquid crystal panel, and in some embodiments, the liquid crystal panel may include first and second substrates disposed at intervals and a liquid crystal layer disposed between the first and second substrates. The display principle of the liquid crystal panel is as follows: the incident first polarized light irradiates the liquid crystal panel, and when the external voltage on two sides of a liquid crystal layer in the liquid crystal panel is 0 under the control of a driving circuit, the input first polarized light does not deflect through the polarization direction of the liquid crystal layer, reaches the bottom of the liquid crystal panel, and is reflected back to output the first polarized light, and the first polarized light returns along the light path of the original illumination light. When an external voltage exists on two sides of a liquid crystal layer in the liquid crystal plate, the input first polarized light deflects through the polarization direction of the liquid crystal layer, and after reaching the liquid crystal plate, the second polarized light is output, and imaging light modulated by the liquid crystal plate is imaged through the lens 40.

The lens 40 is disposed on the outgoing light path of the light modulation device 30, and configured to adjust and project the imaging light. The lens 40 can magnify and project an image corresponding to the imaging light to a projection target area, for example, a Screen (Screen) or a wall surface. The lens 40 includes, for example, a combination of one or more optical lenses having diopters, such as various combinations of non-planar lenses including biconcave lenses, biconvex lenses, meniscus lenses, plano-convex lenses, and plano-concave lenses. In some embodiments, lens 40 may also comprise a planar optical lens. The type and kind of the lens 40 are not limited in the present utility model.

It will be appreciated that the above-described embodiments of the present utility model provide projection system 1 that may further include other optical elements known in the art, such as a collection lens, a mirror 90 (shown in fig. 1), etc., and may be specifically designed as desired, and the present utility model is not limited thereto.

Example 2

Referring to fig. 10, some embodiments of the present utility model provide a projection system 1A, where the projection system 1A includes a light source module 10A and a lens assembly 20, and the light source module 10A includes a light source array 100A, a fluorescent layer 12A and a red light generating mechanism 13A; the light source array 100A is configured to emit excitation light, the fluorescent layer 12A is disposed on at least part of the surface of the light source array 100A, and is configured to generate laser light after being excited by at least part of the excitation light, and the red light generating mechanism 13A is disposed around the light source array 100A or on the surface of the fluorescent layer 12A, and is configured to generate red light; the first light emergent surface of the red light generating mechanism 13A and the first light emergent surface of the fluorescent layer 12A have gradient differences; the lens assembly 20 is disposed on the outgoing light path of the light source module 10A, and configured to form a virtual image for red light.

The structure of the projection system 1A provided in embodiment 2 of the present application is substantially the same as that of the projection system provided in embodiment 1 of the present application, and the difference is that the projection system provided in embodiment 1 of the present application includes a plurality of light emitting components, the plurality of light emitting components provide excitation light, and the plurality of light emitting components are respectively provided with a first fluorescent layer and a red light generating mechanism, whereas the projection system provided in embodiment 2 of the present application includes a light source array 100A, the light source array 100A provides excitation light, and the fluorescent layer 12A and the red light generating mechanism 13A are provided in the entire light source array 100A, i.e. the fluorescent layer 12A covers the light emitting surface of the entire light source array 100A, and the red light generating mechanism 13A is provided around the entire light source array 100A, and compared with embodiment 1 of the present application, the preparation method is simple and easy to operate.

The light source array 100A may include a plurality of light emitting elements 11, the light emitting elements 11 being configured to emit excitation light, and furthermore, the light source array 100A may be disposed on the substrate 200. The light emitting element 11 and the substrate 200 in embodiment 2 of the present application are substantially the same as those provided in embodiment 1, and specific structures thereof can be seen in embodiment 1, and are not repeated here.

The fluorescent layer 12A is disposed on the surface of the light source array 100A, that is, the fluorescent layer 12A is disposed not only on the light emitting elements 11 but also between adjacent light emitting elements 11. The fluorescent layer 12A is configured to be excited by at least a portion of the excitation light to generate a lasing light, which may be mixed with the remaining portion of the excitation light to generate mixed light. Further, in some embodiments, the mixed light is white light, and the color of the fluorescent layer 12A is related to the color of the excitation light emitted by the light source array 100A, and the two colors are usually complementary colors, that is, white light is generated after mixing. For example, in some embodiments, the light source array 100A is a blue LED chip array, and the excitation light emitted by the light source array is blue, and then the fluorescent layer 12A is a yellow fluorescent layer, and the fluorescent layer 12A receives a part of the excitation light of the blue excitation light and mixes with a part of the rest of the blue excitation light to generate white light. In other embodiments, other complementary color light source arrays 100A and phosphor layers 12A may be used, as the application is not limited in this regard. In addition, white light can be generated by combining an ultraviolet light or ultraviolet light LED chip array and an RGB fluorescent layer. The phosphor layer 12A in embodiment 2 of the present application is substantially the same as the first phosphor layer provided in embodiment 1, except for the arrangement position.

The red light generating mechanism 13A is disposed around the light source array 100A or on the surface of the fluorescent layer 12A, and is configured to generate red light, and there is a gradient difference between the first light emitting surface of the red light generating mechanism 13A and the first light emitting surface of the fluorescent layer 12A along the emission direction of the excitation light, that is, the first light emitting surface of the red light generating mechanism 13A and the first light emitting surface of the fluorescent layer 12A are not on the same plane along the emission direction of the excitation light, so that the mixed light can form a real image after passing through the lens assembly 20, and the red light forms an amplified virtual image. Wherein the first light emitting surface of the red light generating mechanism 13A is parallel to the light emitting surface of the substrate; the first light emitting surface of the first fluorescent layer 12 is parallel to the light emitting surface of the substrate.

Specifically, the red Light generating mechanism 13A refers to an element capable of Emitting red Light, which may be a self-luminous element or an element that is excited to generate red Light, wherein the self-luminous element may be a sub-millimeter Light-Emitting Diode (Mini LED) or a Micro Light-Emitting Diode (Micro LED), and the like, and the element that is excited to generate red Light may be a second fluorescent layer configured to generate red Light after being excited by at least part of excitation Light, and in some embodiments, the second fluorescent layer is a red fluorescent layer. In the embodiment of the application, the first light emitting surface of the red light generating mechanism 13A and the first light emitting surface of the fluorescent layer 12A have gradient difference, so that real imaging of white light (mixed light) and virtual imaging of red light are realized through the lens assembly 20 on the light path, thereby realizing better mixing of white light and red light and improving uniformity problem caused by red light supplement. The structure and function of the red light generating mechanism 13A provided in embodiment 2 of the present application are substantially the same as those of the red light generating mechanism provided in embodiment 1 of the present application, except that the position of the red light generating mechanism 13A in embodiment 2 of the present application is different, and the red light generating mechanism 13A is disposed on the surface of the fluorescent layer 12A or around the light source array 100A.

Specifically, the gradient difference between the first light emitting surface of the fluorescent layer 12A and the first light emitting surface of the second fluorescent layer 130A in the present application can be achieved by the following embodiments to better mix red light into mixed light.

In some embodiments, referring to fig. 10 and 11, the red light generating mechanism 13A includes a second fluorescent layer 130A, and the second fluorescent layer 130A is configured to generate red light after being excited by at least part of the excitation light; the size of the second fluorescent layer 130A is smaller than that of the fluorescent layer 12A, and the second fluorescent layer 130A is disposed in a central area of the first light-emitting surface of the fluorescent layer 12A.

In other embodiments, referring to fig. 12, the red light generating mechanism 13A includes a second fluorescent layer 130A, and the second fluorescent layer 130A is configured to generate red light after being excited by at least part of the excitation light; the second fluorescent layer 130A is disposed on the first light-emitting surface of the fluorescent layer 12A, and the second fluorescent layer 130A has a through hole 131A extending along the thickness direction of the second fluorescent layer 130A, so that a portion of the first light-emitting surface of the fluorescent layer 12A is exposed through the through hole 131A. Through the mode, red light can be generated around the mixed light, when the mixed light and the red light act through the lens component, an image formed by the mixed light is a real image, and an image formed by the red light is an amplified virtual image, so that good mixing of light spots of the mixed light and the red light is realized, and uniform emergent of light is realized while red light is finally supplemented.

In other embodiments, the red light generating mechanism 13A includes a plurality of second fluorescent layers 130A, and the plurality of second fluorescent layers 130A are disposed in a central area of the first light emitting surface of the fluorescent layer 12A.

In other embodiments, referring to fig. 13, the red light generating mechanism 13A includes four second fluorescent layers 130A, the first light emitting surface of the fluorescent layer 12A is rectangular, and four corners of the first light emitting surface of the fluorescent layer 12A are respectively provided with one second fluorescent layer 130A. The method can enable the emergent red light to be symmetrically arranged around the mixed light, when the mixed light and the red light pass through the lens assembly, an image formed by the mixed light is a real image, and an image formed by the red light is an amplified virtual image, so that good mixing of light spots of the mixed light and the red light is realized, and uniform emergent of light is realized while red light is finally realized.

In some embodiments, referring to fig. 14, the red light generating mechanism 13A includes at least one mini-LED132A configured to emit red light, and the light source array 100A includes a first side, a second side, a third side, and a fourth side perpendicular to the first light emitting surface of the light source array 100A and sequentially connected; at least one mini-LED is disposed adjacent at least one of the first side, the second side, the third side, and the fourth side.

In some embodiments, the red light generating mechanism 13A includes four mini-LEDs disposed on one side of the first side, one side of the second side, one side of the third side, and one side of the fourth side, respectively. By the mode, the emergent red light is symmetrically arranged around the mixed light, when the mixed light and the red light pass through the lens assembly, an image formed by the mixed light is a real image, and an image formed by the red light is an amplified virtual image, so that light spots of the real image and the virtual image are overlapped as much as possible, and better light mixing of the red light and the mixed light is realized.

In other embodiments, referring to FIG. 15, the red light generating mechanism 13A includes six mini-LEDs, where two mini-LEDs are disposed adjacent to the first side, two mini-LEDs are disposed adjacent to the third side, one mini-LED is disposed adjacent to the second side, and one mini-LED is disposed adjacent to the fourth side. Alternatively, in other embodiments, the red light generating mechanism 13A includes eight mini-LEDs, with two mini-LEDs disposed on each of the first, second, third, and fourth sides. In this way, the emitted red light can be symmetrically arranged around the mixed light, and more mini-LEDs can generate more red light, so that the red duty ratio can be increased.

The projection system 1A provided in embodiment 2 of the present application may further include the light modulation device 30, the lens 40 and the reflecting mirror 90 of the projection system provided in embodiment 1, which have the same structure and function, and are not described herein again.

The projection system is not limited to the above-mentioned embodiments, and all the components are not limited to be disposed adjacent to or in direct contact with each other, and in practical application, suitable components, or relative positional relationships, may be selected according to requirements such as product structures, or other structures may be disposed between adjacent components to indirectly contact the adjacent components.

The foregoing is only the embodiments of the present application, and therefore, the patent scope of the application is not limited thereto, and all equivalent structures or equivalent processes using the descriptions of the present application and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the application.

Claims

1. A projection system, comprising:

a plurality of light emitting assemblies, each of the light emitting assemblies comprising:

a light emitting element configured to emit excitation light;

the first fluorescent layer is arranged on the surface of the light-emitting element and is configured to generate laser after being excited by at least part of the excitation light; and

A red light generating mechanism disposed around the light emitting element or on a surface of the first fluorescent layer, configured to generate red light;

the first light emergent surface of the red light generating mechanism and the first light emergent surface of the first fluorescent layer have gradient differences; and

the plurality of lens assemblies are arranged on the emergent light paths of the corresponding light-emitting assemblies and are configured to form virtual images for the red light.

2. The projection system of claim 1 wherein the lens assembly includes a collection lens element, a plurality of the collection lens elements being located on the same plane.

3. The projection system of claim 1 or 2, wherein the red light generating mechanism comprises a second phosphor layer configured to generate the red light upon excitation by at least a portion of the excitation light; the size of the second fluorescent layer is smaller than that of the first fluorescent layer, and the second fluorescent layer is arranged in the central area of the first light-emitting surface of the first fluorescent layer.

4. The projection system of claim 1 or 2, wherein the red light generating mechanism comprises a second phosphor layer configured to generate the red light upon excitation by at least a portion of the excitation light; the second fluorescent layer is arranged on the first light-emitting surface of the first fluorescent layer, and the second fluorescent layer is provided with a through hole extending along the thickness direction of the second fluorescent layer, so that part of the first light-emitting surface of the first fluorescent layer is exposed through the through hole.

5. The projection system of claim 1 or 2, wherein the red light generation mechanism comprises a plurality of second fluorescent layers configured to generate the red light after being excited by at least a portion of the excitation light, the plurality of second fluorescent layers being disposed in a central region of the first light-emitting surface of the first fluorescent layer.

6. The projection system of claim 1 or 2, wherein the red light generating mechanism comprises four second phosphor layers configured to generate the red light upon excitation by at least a portion of the excitation light; the first light-emitting surface of the first fluorescent layer is rectangular, and four corners of the first light-emitting surface of the first fluorescent layer are respectively provided with the second fluorescent layer.

7. The projection system of claim 3 wherein the light emitting element is a blue LED chip, the first phosphor layer is a yellow phosphor layer, and the second phosphor layer is a red phosphor layer.

8. The projection system of claim 1 or 2, wherein the red light generating mechanism comprises at least one mini-LED configured to emit the red light; the light-emitting element comprises a first side surface, a second side surface, a third side surface and a fourth side surface which are perpendicular to a first light-emitting surface of the light-emitting element and are sequentially connected; the at least one mini-LED is disposed adjacent at least one of the first side, the second side, the third side, and the fourth side.

9. The projection system of claim 8, wherein the red light generating mechanism comprises four mini-LEDs disposed on one side of the first side, one side of the second side, one side of the third side, and one side of the fourth side, respectively.

10. The projection system of claim 8 wherein the red light generating mechanism comprises six of the mini-LEDs, wherein two of the mini-LEDs are disposed adjacent to the first side, wherein two of the mini-LEDs are disposed adjacent to the third side, wherein one of the mini-LEDs is disposed adjacent to the second side, and wherein one of the mini-LEDs is disposed adjacent to the fourth side.

11. The projection system of claim 8, wherein the red light generating mechanism comprises eight of the mini-LEDs, two of the mini-LEDs being disposed on each of the first side, the second side, the third side, and the fourth side.

12. A projection system, comprising:

a light source module, comprising:

a light source array configured to emit excitation light;

the fluorescent layer is arranged on at least part of the surface of the light source array and is configured to generate laser after being excited by at least part of the excitation light; and

A red light generating mechanism disposed around the light source array or on the surface of the fluorescent layer, configured to generate red light;

the first light emergent surface of the red light generating mechanism and the first light emergent surface of the fluorescent layer have gradient differences; and

the lens component is arranged on the emergent light path of the light source module and is configured to form a virtual image for the red light.

13. The projection system of claim 12 wherein the red light generating mechanism comprises a second phosphor layer configured to generate the red light upon excitation by at least a portion of the excitation light; the size of the second fluorescent layer is smaller than that of the fluorescent layer, and the second fluorescent layer is arranged in the central area of the first light-emitting surface of the fluorescent layer.

14. The projection system of claim 12 wherein the red light generating mechanism comprises a second phosphor layer configured to generate the red light upon excitation by at least a portion of the excitation light; the second fluorescent layer is arranged on the first light-emitting surface of the fluorescent layer, and the second fluorescent layer is provided with a through hole extending along the thickness direction of the second fluorescent layer, so that part of the first light-emitting surface of the fluorescent layer is exposed through the through hole.

15. The projection system of claim 12, wherein the red light generation mechanism comprises a plurality of second phosphor layers configured to generate the red light upon excitation by at least a portion of the excitation light, the plurality of second phosphor layers disposed in a central region of the first light exit surface of the phosphor layers.

16. The projection system of claim 12 wherein the red light generating mechanism comprises four second phosphor layers configured to generate the red light upon excitation by at least a portion of the excitation light; the first light-emitting surface of the fluorescent layer is rectangular, and four corners of the first light-emitting surface of the fluorescent layer are respectively provided with the second fluorescent layer.

17. The projection system of claim 12, wherein the red light generating mechanism comprises at least one mini-LED configured to emit the red light; the light source array comprises a first side face, a second side face, a third side face and a fourth side face which are perpendicular to a first light-emitting face of the light source array and are sequentially connected; at least one of the mini-LEDs is disposed adjacent at least one of the first side, the second side, the third side, and the fourth side.

18. The projection system of claim 17, wherein the red light generation mechanism comprises four mini-LEDs disposed on one side of the first side, one side of the second side, one side of the third side, and one side of the fourth side, respectively.

19. The projection system of claim 17 wherein the red light generating mechanism comprises six of the mini-LEDs, wherein two of the mini-LEDs are disposed adjacent to the first side, wherein two of the mini-LEDs are disposed adjacent to the third side, wherein one of the mini-LEDs is disposed adjacent to the second side, and wherein one of the mini-LEDs is disposed adjacent to the fourth side.

20. The projection system of claim 17, wherein the red light generating mechanism comprises eight of the mini-LEDs, two of the mini-LEDs being disposed on each of the first side, the second side, the third side, and the fourth side.