Wavelength conversion wheel and projection system

Abstract

The utility model discloses a wavelength conversion wheel, comprising a substrate, which comprises a first surface and a second surface arranged opposite to the first surface; the wavelength conversion area is located on the first surface of the substrate, and the wavelength conversion area comprises a wavelength conversion layer; the light conversion area is located on the first surface of the substrate, the light conversion area comprises a reflecting layer, a gap layer and a light conversion component, the reflecting layer is formed on the first surface of the substrate, and the light conversion component is located on the side, away from the substrate, of the reflecting layer; and the reflecting layer and the light conversion part are arranged at an interval through the gap layer. According to the projection system provided by the invention, the light conversion part is directly integrated on the wavelength conversion wheel, and the light can be directly converted, so that the light path architecture of the projection system is simplified, the cost is reduced, meanwhile, the excitation light of the incident wavelength conversion layer is not lost, and the conversion efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to wavelength conversion technical field more particularly, the utility model relates to a wavelength conversion wheel and projection system. BACKGROUND

[0002] Recently, projection devices mainly using solid-state light sources such as light-emitting diodes (LEDs) and laser diodes are gradually occupying a place in the market. Generally speaking, the excitation light of these solid-state light sources is converted by wavelength conversion materials on the wavelength conversion module in the projection device to generate conversion light of different colors.

[0003] In the prior art, the structure of the projection system generally includes a laser module, a dichroic mirror, a light conversion component, and a fluorescent wheel. The laser module generates first color light. The first polarization component in the first color light passes through the dichroic mirror and is converted by the light conversion component into elliptical polarized light. The elliptical polarized light can converge on the fluorescent wheel. The fluorescent wheel includes a first reflection area (wavelength conversion layer) and a second reflection area (non-wavelength conversion layer), which can be alternately switched to a position where the elliptical polarized light can converge. The elliptical polarized light is excited to generate second color light at the first reflection area and is reflected back to the light conversion component. The elliptical polarized light reflected by the second reflection area is converted into the second polarization component of the first color light by the light conversion component, and the second color light reflected by the light conversion component is output through the dichroic mirror, respectively. However, the first color light generated by the laser module will lose light after passing through the light conversion component, affecting the wavelength conversion efficiency and thus the color gamut and brightness of the projection system. Moreover, this structure is complex, requires a separate light conversion component, increases the volume of the projection system, and is not easy to miniaturize.

[0004] In summary, there is an urgent need to provide a wavelength conversion wheel and a projection system with a new design or a new structure to solve the technical problems in the prior art. UTILITY MODEL CONTENT

[0005] Therefore, it is necessary to provide a wavelength conversion wheel and a projection system to solve the above technical problems.

[0006] One technical solution of the utility model is:

[0007] A wavelength conversion wheel, characterized in that it comprises:

[0008] a substrate, the substrate comprising a first surface and a second surface arranged opposite to the first surface;

[0009] a wavelength conversion area, the wavelength conversion area being located on the first surface of the substrate, and the wavelength conversion area comprising a wavelength conversion layer;

[0010] A light conversion region is located on the first surface of the substrate, and the light conversion region comprises a reflective layer, a gap layer and a light conversion component.

[0011] In one embodiment, the reflective layer comprises a first surface and a second surface, and the second surface of the reflective layer is located opposite to the first surface of the substrate, and the first surface of the reflective layer is higher than the first surface of the substrate.

[0012] In one embodiment, the gap layer is a polymer layer, the reflective layer and the light conversion component are bonded by the polymer layer, and there is a refractive index difference between the polymer layer and the light conversion component.

[0013] In one embodiment, the gap layer is an air layer, and the light conversion component is arranged adjacent to the light conversion region, so that the air layer is formed between the light conversion component and the reflective layer.

[0014] In one embodiment, the first surface of the substrate is provided with a recess structure, and the light conversion region is located in the recess structure.

[0015] In one embodiment, the reflective layer is located in the recess structure, and the reflective layer comprises a first surface and a second surface, and the second surface of the reflective layer faces the bottom of the recess structure, and the first surface of the reflective layer is lower than the first surface of the substrate.

[0016] In one embodiment, the light conversion component is arranged on the first surface of the substrate, so that the air layer is formed between the light conversion component and the reflective layer.

[0017] In one embodiment, the light conversion component converts the incident light to form the outgoing light with additional optical path difference.

[0018] In one embodiment, the thickness of the gap layer is not less than 1 microns.

[0019] A projection system, characterized in that the projection system comprises the wavelength conversion wheel according to any one of the above.

[0020] The beneficial effects of the utility model are as follows:

[0021] The wavelength conversion wheel and the projection system thereof are provided, the light conversion component is directly arranged on the wavelength conversion wheel, the wavelength conversion wheel comprises a wavelength conversion layer, a reflection layer and the light conversion component, the reflection layer is arranged in a substrate, the light conversion component is located on a side of the reflection layer away from the substrate, and a gap layer is arranged between the reflection layer and the light conversion component. The device is beneficial to simplify the light path structure of the projection system, reduce the cost, and improve the conversion efficiency without loss of the excitation light incident on the wavelength conversion layer. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a schematic diagram of a light path structure of a projection system according to the present application;

[0023] Figure 2 FIG. 2 is a schematic diagram of a light conversion structure of a wavelength conversion wheel according to the present application;

[0024] Figure 3 FIG. 3 is a schematic diagram of a wavelength conversion wheel structure according to the present application;

[0025] Figure 4 FIG. 4 is a schematic diagram of a cross-sectional structure of a wavelength conversion wheel according to the present application;

[0026] Figure 5 FIG. 5 is a schematic diagram of another cross-sectional structure of a wavelength conversion wheel according to the present application;

[0027] Figure 6 FIG. 6 is a schematic diagram of a cross-sectional structure of a light conversion area in a wavelength conversion wheel according to the present application;

[0028] Figure 7 FIG. 7 is a schematic diagram of another cross-sectional structure of a light conversion area in a wavelength conversion wheel according to the present application. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described below. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "arranged on" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting. As used in this patent, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0032] A wavelength conversion wheel, which can be normally used in lighting system, projection system, generally uses laser to irradiate the fluorescent layer on the surface of the wavelength conversion wheel, so that the excited light is emitted, thereby realizing the effect of light emission, characterized in that the wavelength conversion wheel comprises:

[0033] A substrate, which comprises a first surface and a second surface arranged oppositely; the substrate can be an aluminum substrate, or other metal substrate with good heat dissipation effect, of course, it can also be a transparent substrate, such as sapphire glass substrate and the like, the central region of the substrate is connected with a motor, so that the motor can drive the substrate to rotate; the substrate can be a whole, or it can also be composed of several sub- substrates, so the foregoing whole is relative to the spliced substrate; the surface of the substrate is divided into several regions, different regions can be provided with different functions, for example, one or more combinations of filtering area, wavelength conversion area, transmission area or diffusion area;

[0034] A wavelength conversion area, which is located on the first surface of the substrate, the wavelength conversion area comprises a wavelength conversion layer; the first surface of the substrate can be provided with two or more wavelength conversion areas, the material of the wavelength conversion layer in each wavelength conversion area can be different, for example, G fluorescent powder area, Y fluorescent powder area and the like, the function of the wavelength conversion area is to emit excited light when irradiated by laser, thereby meeting the demand of light emission;

[0035] The light conversion region is located on the first surface of the substrate, and comprises a reflective layer, a gap layer and a light conversion component. The reflective layer is formed on the first surface of the substrate, the light conversion component is located on the side of the reflective layer away from the substrate, and the reflective layer and the light conversion component are spaced apart by the gap layer. In one embodiment, the thickness of the gap layer is not less than 1 micrometer. The light conversion component converts incident light to form outgoing light with an additional optical path difference. In general, the light conversion component is a phase delay sheet. In order to ensure that the color gamut and brightness of the light emitted by the wavelength conversion wheel meet the requirements, the arrangement between the reflective layer and the light conversion component on the substrate will directly affect the light emission quality of the wavelength conversion wheel when designing the light conversion region. The gap layer needs to be arranged between the reflective layer and the light conversion component, so as to ensure that the light has a certain optical path space, and the light can be better emitted to meet the color gamut and brightness requirements of the wavelength conversion wheel.

[0036] In one embodiment, the reflective layer comprises a first surface and a second surface, the second surface of the reflective layer is arranged opposite to the first surface of the substrate, and the first surface of the reflective layer is higher than the first surface of the substrate. The reflective layer is arranged on the first surface of the substrate, and the second surface of the reflective layer is in contact with the first surface of the substrate. The reflective layer is formed on the surface of the substrate by plating, or a coating layer containing a reflective material is arranged. In this way, the first surface of the reflective layer is higher than the second surface of the substrate, that is, the reflective layer is protruded on the first surface of the substrate.

[0037] In one embodiment, the gap layer is a polymer layer, the reflective layer and the light conversion component are arranged by bonding through the polymer layer, and there is a refractive index difference between the polymer layer and the light conversion component. In this way, the polymer layer is arranged between the reflective layer and the light conversion component by artificial means to increase the optical path of light. However, it is necessary to ensure that there is a refractive index difference between the polymer layer and the light conversion component to ensure better transmission of light. The refractive index difference should be not less than 0.1.

[0038] In one embodiment, the gap layer is an air layer, and the light conversion component is arranged on the adjacent area of the light conversion region, so that the air layer is formed between the light conversion component and the reflective layer. In this way, the light conversion component is arranged on the material of the adjacent area. For example, the area adjacent to the light conversion region is a wavelength conversion region. In this case, the light conversion component is arranged on the surface of the wavelength conversion layer. It should be noted that the first surface of the reflective layer is lower than the surface of the wavelength conversion layer, so that the gap layer is an air layer.

[0039] In one embodiment, the first surface of the substrate is provided with a recess structure, and the light conversion region is located in the recess structure. In one embodiment, the reflective layer is located in the recess structure, and the reflective layer includes a first surface and a second surface. The second surface of the reflective layer faces the bottom of the recess structure, and the first surface of the reflective layer is lower than the first surface of the substrate. In this way, the thickness of the wavelength conversion wheel can be greatly reduced, which is more suitable for small volume design requirements and does not increase the volume of the wavelength conversion wheel due to the arrangement of the light conversion component. In one embodiment, the light conversion component is arranged on the first surface of the substrate, so that an air layer is formed between the light conversion component and the reflective layer.

[0040] A projection system, characterized in that the projection system comprises the wavelength conversion wheel according to any one of the above embodiments.

[0041] Please refer to Figure 1 、 Figure 2 and Figure 3 , a projection system comprises a wavelength conversion wheel 100, a laser light source 200, a first optical element 300, a second optical element 310, a light homogenizing element 400, and a beam splitter 500. The laser light source 200 emits excitation light. After the excitation light passes through the first optical element 300, it is incident on the light homogenizing element 400. After the excitation light is incident on the beam splitter 500 and the second optical element 310, it is incident on the wavelength conversion wheel 100. At this time, the wavelength conversion wheel 100 forms stimulated light after being irradiated by the excitation light. After the stimulated light passes through the second optical element 310 and the beam splitter 500, it is emitted. When the excitation light is incident on the light conversion region of the wavelength conversion wheel 100, the light conversion component 33 will convert the excitation light. The wavelength conversion wheel 100 is driven to rotate by a motor 40. The beam splitter 500 reflects or transmits the excitation light and the light converted by the light conversion component and the stimulated light. As shown in Figure 2 、 Figure 3As shown, the wavelength conversion wheel 100 comprises a substrate 10, a wavelength conversion region 20 and an optical conversion region 30, the substrate 10 comprises a first surface and an oppositely arranged second surface, the wavelength conversion region 20 and the optical conversion region 30 are located on the first surface of the substrate 10, the wavelength conversion region 20 is provided with a wavelength conversion layer 21, the optical conversion region 30 comprises a reflective layer 31, a gap layer 32 and an optical conversion component 33, for example, the excitation light is first polarized state light, which is converted into third polarized state light after passing through the optical conversion component 33, is reflected by the mirror, passes through the optical conversion component again, and then the second polarized state light is emitted, so that there is an additional optical path difference between the incident light and the emitted light.

[0042] Please refer to Figure 4 and Figure 6 , the cross-sectional view of the wavelength conversion wheel 100 can be seen, the reflective layer 31 is arranged on the first surface of the substrate 10, the reflective layer 31 comprises a first surface and a second surface, the first surface of the reflective layer 31 is higher than the first surface of the substrate 10, from Figure 4 , it can also be seen that the reflective layer 31 is convexly arranged on the surface of the substrate 10, the first surface of the reflective layer 31 is provided with a gap layer 32, the gap layer 32 can be a polymer layer or an air layer; the optical conversion layer 33 is arranged on the side of the gap layer 32 away from the reflective layer, as Figure 6 shown, when the gap layer 32 is an air layer, at this time the first surface of the reflective layer 31 is lower than the surface of the wavelength conversion layer 21, and the optical conversion component 33 is arranged on the surface of the adjacent wavelength conversion layer 21, so that the gap layer 32 formed is an air layer due to the height difference between the reflective layer 31 and the surface of the wavelength conversion layer 21.

[0043] Please refer to Figure 5 and Figure 7 , another structure of the wavelength conversion wheel is given, the first surface of the substrate 10 is provided with a recess structure, so that the reflective layer 31 is arranged at the bottom of the recess structure, so that the depth of the recess structure is greater than the thickness of the reflective layer 31, and the optical conversion component 33 is arranged on the first surface of the substrate 10, since the thickness of the reflective layer 31 is less than the depth of the recess structure, at this time the gap layer 32 is formed, and the gap layer 32 is an air layer.

[0044] In this application, the optical conversion component is directly integrated on the wavelength conversion wheel, and a gap layer is arranged between the reflective layer and the optical conversion component, which can greatly guarantee the color gamut and brightness of the projection system, this device is beneficial to simplify the optical path architecture of the projection system, reduce the cost, and at the same time has no loss to the excitation light incident on the wavelength conversion layer, and improves the conversion efficiency.

[0045] In order to make the above objects, features and advantages of the present application more obvious, the specific embodiments of the present application are described in detail above in combination with the drawings. In the above description, many specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from the above description, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited by the above disclosed specific embodiments. Moreover, each technical feature of the above described embodiments can be combined arbitrarily, and in order to make the description simple, each technical feature in the above described embodiments is not described in all possible combinations, however, as long as the combination of these technical features does not exist contradictory, it should be considered as the scope of the present application.

[0046] The above described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the present application. It should be pointed out that for those skilled in the art, on the premise of not departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A wavelength conversion wheel, characterized in that, The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. The projection system comprises the wavelength conversion wheel according to any one of claims 1-9.

2. A wavelength conversion wheel according to claim 1, characterized in that The projection system comprises the wavelength conversion wheel according to any one of claims 1-9.

3. A wavelength conversion wheel according to claim 2, wherein, The projection system comprises the wavelength conversion wheel according to any one of claims 1-9.

4. A wavelength conversion wheel according to claim 2, wherein, The projection system comprises the wavelength conversion wheel according to any one of claims 1-9.

5. The wavelength conversion wheel of claim 1, wherein, The projection system comprises the wavelength conversion wheel according to any one of claims 1-9.

6. A wavelength conversion wheel according to claim 5, wherein, The projection system comprises the wavelength conversion wheel according to any one of claims 1-9.

7. A wavelength conversion wheel according to claim 6, wherein, The projection system comprises the wavelength conversion wheel according to any one of claims 1-9.

8. The wavelength conversion wheel of claim 1, wherein, The projection system comprises the wavelength conversion wheel according to any one of claims 1-9.

9. A wavelength conversion wheel according to any one of claims 1 to 8, characterized in that The projection system comprises the wavelength conversion wheel according to any one of claims 1-9.

10. A projection system, characterized by The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. The projection system comprises the wavelength conversion wheel according to any one of claims 1-9. 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