JP2018517255A - Wavelength converter, light source system, and projection system - Google Patents

Abstract

The present invention provides a wavelength converter, a light source system, and a projection system. The wavelength conversion device includes a wavelength conversion sheet (1), and the wavelength conversion sheet (1) includes a reflective layer (11) and a light emitting layer (12) positioned on one surface of the reflective layer (11). The light emitting layer (12) includes at least two light emitting regions, different light emitting regions have different wavelength conversion materials, and the thickness of the reflective layer (11) corresponding to at least one light emitting region corresponds to another light emitting region. It is smaller than the thickness of the reflective layer (11). By reducing the thickness of the reflective layer (11) corresponding to the light emitting region that generates much heat and increasing the thickness of the reflective layer (11) corresponding to the light emitting region that generates less heat, the heat dissipation and stability of the phosphor powder layer are satisfied. At the same time, the reflectance of the reflective layer (11) is improved, and the luminous efficiency of the wavelength conversion device is improved.
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Description

  The present invention relates to the technical field of projectors, and more particularly to a wavelength converter, a light source system, and a projection system.

  With the advancement of semiconductor technology, the use of a solid light source, such as an LD (Laser Diode, laser diode), as a light source for a projector instead of a halogen light bulb has already become an important technological evolution direction. In a projection system in which a laser diode is used as a light source, laser light emitted from the laser diode irradiates different areas in the wavelength conversion device as the wavelength conversion device rotates. Since phosphor powder layers of different colors are provided in different regions of the wavelength conversion device, different colors of excited light can be generated. After these different colors of excited light are combined into one light, a projected image is displayed.

  A conventional wavelength conversion device includes a diffuse reflection layer and a phosphor powder layer bonded to the surface of the diffuse reflection layer. Here, the diffuse reflection layer is composed of scattering particles and a glass body. The thicker the irregular reflection layer, the higher the reflectance, but the higher the thermal resistance. Therefore, in the prior art, usually, by making the irregular reflection layer thin, the thermal resistance is reduced, and the heat dissipation of the phosphor powder layer and the stability of the wavelength conversion device are improved. However, if it does in this way, the reflectance of an irregular reflection layer will become low, and, thereby, the luminous efficiency of a wavelength converter will fall.

  The present invention has been made in view of the above problems, and provides a wavelength conversion device, a light source system, and a projection system in order to solve the problem that the light emission efficiency of a conventional wavelength conversion device decreases.

In order to achieve the above object, the present invention provides the following technical solutions.
A wavelength conversion device, the wavelength conversion device comprising a wavelength conversion sheet, the wavelength conversion sheet comprising a reflective layer and a light emitting layer located on one surface of the reflective layer;
The light emitting layer includes at least two light emitting regions, different light emitting regions have different wavelength conversion materials, and the thickness of the reflective layer corresponding to at least one of the light emitting regions corresponds to the other light emitting regions. It is smaller than the thickness of the reflective layer.

  Preferably, the light emitting layer includes a first light emitting region and a second light emitting region, the reflective layer includes a first reflective region and a second reflective region, and the first reflective region corresponds to the first light emitting region. The second reflection area is installed corresponding to the second light emitting area, and the thickness of the first reflection area is smaller than the thickness of the second reflection area.

  Preferably, the wavelength converting material of the first light emitting region is a red phosphor powder, and the wavelength converting material of the second light emitting region is a yellow phosphor powder or a green phosphor powder.

  Preferably, the light emitting layer further includes a third light emitting region, the reflective layer further includes a third reflective region, the third reflective region is disposed corresponding to the third light emitting region, and the first reflective region is provided. The thickness of the region is smaller than the thickness of the third reflective region.

  Preferably, the wavelength conversion material of the first light emitting region is a red phosphor powder, the wavelength conversion material of the second light emitting region is a blue phosphor powder, and the wavelength conversion material of the third light emitting region is Green phosphor powder.

  Preferably, the light emitting layer further includes a light reflection region, the reflection layer further includes a third reflection region, the third reflection region is disposed corresponding to the light reflection region, and the light reflection region is a transparent material. Alternatively, it is made of a reflective material.

  Preferably, the reflection layer is an irregular reflection layer, and a heat dissipation layer is provided on the surface of the irregular reflection layer on one side away from the light emitting layer, or the reflection layer is a reflection ceramic, and the reflection ceramic is Alumina ceramics, zirconium oxide ceramics, boron oxide ceramics, or composite ceramics in which zirconium oxide is doped with alumina.

  Preferably, the difference between the thickness of the reflective layer corresponding to at least one of the light emitting regions and the thickness of the reflective layer corresponding to the other light emitting regions is not less than 0.02 mm and not more than 0.06 mm.

  Preferably, at least one of the reflective layers corresponding to the light emitting region is a reflective ceramic, and the other reflective layers corresponding to the light emitting regions are irregular reflection layers, and one surface of the irregular reflection layer that is remote from the light emitting layer. The reflective ceramics are alumina ceramics, zirconium oxide ceramics, boron oxide ceramics, or composite ceramics in which zirconium oxide is doped with alumina.

  It is a light source system, The said light source system is provided with an excitation light source and the said any one said wavelength converter.

  A projection system comprising the light source system.

  Compared with the prior art, the technical solution provided by the present invention has the following merits.

  Since the wavelength conversion device, the light source system, and the projection system provided by the present invention have different thermal effects of different wavelength conversion materials, the light emitting region that generates a lot of heat makes the corresponding reflective layer thin, and the light emitting region that generates less heat. The corresponding reflective layer can be made thick, thereby satisfying the heat radiation and reflection performance of the phosphor powder layer to the maximum and improving the light emission efficiency of the wavelength conversion device.

  In order to more clearly describe the technical solutions in the embodiments of the present invention or the prior art, the drawings necessary for the description of the embodiments or the prior art will be briefly described below. It is only an embodiment of the invention, and it is possible for a person skilled in the art to obtain other drawings based on these drawings on the premise that no creative effort is required.

It is sectional drawing which shows the wavelength converter which concerns on one Example of this invention. It is sectional drawing which shows the wavelength conversion sheet which concerns on one specific embodiment of this invention. It is a top view which shows the wavelength conversion sheet which concerns on specific embodiment of this invention. It is sectional drawing which shows the wavelength conversion sheet which concerns on another specific embodiment of this invention. It is a top view which shows the wavelength conversion sheet which concerns on another specific embodiment of this invention. It is a schematic diagram which shows the cross-sectional structure of the reflection layer which concerns on one Example of this invention.

  As explained in the background art, the conventional wavelength conversion device usually reduces the thermal resistance by thinning the diffuse reflection layer and improves the heat dissipation of the phosphor powder layer and the stability of the wavelength conversion device. If it does so, the reflectance of a diffused reflection layer will become low, and, thereby, the luminous efficiency of a wavelength converter will fall.

  As a result of the inventor's earnest research, the thermal effects of different wavelength conversion materials are different, for example, the blue phosphor powder thermal effect and the green phosphor powder have a small thermal effect, and the red phosphor powder has a large thermal effect. The reflection layer corresponding to the phosphor powder and the green phosphor powder can be made thicker, and the reflection layer corresponding to the red phosphor powder can be made thinner. Thus, the reflectance of the reflection layer corresponding to the red phosphor powder can be reduced. Assuming that it is sufficiently high, the heat dissipation of the blue phosphor powder and the green phosphor powder is not significantly affected, and the reflectance and wavelength conversion of the irregular reflection layer corresponding to the blue phosphor powder and the green phosphor powder It was discovered that the luminous efficiency of the device can be improved.

  Based on this, in order to overcome the above-mentioned problems existing in the prior art, the present invention provides a wavelength conversion device, the wavelength conversion device includes a wavelength conversion sheet, the wavelength conversion sheet includes a reflective layer and the reflective layer A light-emitting layer sintered on one side of the light-emitting layer, the light-emitting layer includes at least two light-emitting regions, different light-emitting regions have different wavelength conversion materials, and the reflective layer corresponding to at least one light-emitting region Is smaller than the thickness of the reflective layer corresponding to the other light emitting regions.

  The present invention further provides a light source system, and the light source system includes an excitation light source and the wavelength converter described above.

  The present invention further provides a projection system, which comprises the light source system described above.

  Since the wavelength conversion device, the light source system, and the projection system according to the present invention have different thermal effects of different wavelength conversion materials, the light-emitting region that generates a large amount of heat reduces the corresponding reflective layer, and the light-emitting region that generates a small amount of heat corresponds. The reflective layer can be made thicker, thus satisfying the heat dissipation and stability of the phosphor powder layer, improving the reflectance of some light emitting regions, and improving the luminous efficiency of the wavelength converter. it can.

  The above is the gist of the present invention, and in order to make the above objects, features, and advantages of the present invention clearer and easier to understand, specific embodiments of the present invention will be described in detail below with reference to the drawings. explain.

  In order to fully understand the present invention, many specific descriptions are described in the following description. However, the present invention can be implemented in other forms different from the forms described herein. Since those skilled in the art can perform similar developments as long as they do not contradict the gist of the present invention, the present invention is not limited to the specific examples described below.

  Next, the present invention will be described in detail with reference to schematic diagrams. However, when describing embodiments of the present invention in detail, for convenience of explanation, cross-sectional views showing the configuration of components are not in accordance with general proportions. The part may be enlarged. Further, the schematic diagram is merely an example, and does not limit the scope protected by the present invention. It should be noted that the actual creation should include three-dimensional spatial dimensions of length, width and height.

Hereinafter, the present invention will be described in detail by way of examples.
One embodiment of the present invention provides a wavelength conversion device. As shown in FIG. 1, the wavelength conversion device is a wavelength conversion sheet 1 and a driving device 2 that drives the wavelength conversion sheet 1 so that the wavelength conversion sheet 1 rotates. Is provided. The wavelength conversion sheet 1 preferably has a circular sheet-like structure. The drive device 2 is a device such as a rotation shaft and a motor arranged at the center of the wavelength conversion sheet 1, and drives the wavelength conversion sheet 1 so that the wavelength conversion sheet 1 rotates around the center axis of the circle. Used.

  In this embodiment, as shown in FIGS. 2 and 4, the wavelength conversion sheet 1 includes a reflective layer 11 and a light emitting layer 12 sintered on one side of the reflective layer 11. 3 and 5, the light emitting layer 12 includes at least two light emitting regions, for example, light emitting regions 120 and 121, different light emitting regions have different wavelength conversion materials, and at least one light emitting region has The thickness of the corresponding reflective layer is smaller than the thickness of the reflective layer corresponding to the other light emitting regions. Since the blue phosphor powder and the green phosphor powder have a small thermal effect, the reflective layer corresponding to the blue light emitting region and the green light emitting region can be made thicker, and the reflective layer in the other light emitting regions should be made thin. Of course, the present invention is not limited to this, and the specific thickness of the reflective layer is set according to the wavelength conversion material of the light emitting region, that is, the thermal effect of the phosphor powder. be able to.

  In this embodiment, the wavelength conversion material is a material that can convert light incident on the wavelength conversion material into light having a different wavelength, and includes well-known materials such as phosphor powder, nano-luminescent material, and quantum dots.

  In one specific embodiment of the present invention, as shown in FIGS. 2 and 3, the light emitting layer 12 may include a first light emitting region 120 and a second light emitting region 121, and the reflective layer 11 The first reflective area 110 and the second reflective area 111 may be provided. Here, the first reflective area 110 is installed corresponding to the first light emitting area 120, and the second reflective area 111 is the second light emitting area 121. That is, in the direction perpendicular to the wavelength conversion sheet 1, the projection of the first reflection region 110 overlaps the projection of the first light emission region 120, and the projection of the second reflection region 111 is the second light emission. It overlaps with the projection of the region 121, and the thickness of the first reflective region 110 is smaller than the thickness of the second reflective region 111. Preferably, the range of the difference D between the thickness of the first reflective region 110 and the thickness of the second reflective region 111 is not less than 0.02 mm and not more than 0.06 mm.

  Specifically, the wavelength conversion material of the first light emitting region 120 may be a red phosphor powder, and the wavelength conversion material of the second light emitting region 121 may be a yellow phosphor powder or a green phosphor powder. However, the present invention is not limited to this, and it is sufficient that the thermal effect of the wavelength conversion material of the second light emitting region 121 is smaller than the thermal effect of the wavelength conversion material of the first light emitting region 120.

  In another specific embodiment of the present invention, as shown in FIGS. 4 and 5, the light emitting layer 12 may include a first light emitting region 120, a second light emitting region 121, and a third light emitting region 122, The reflective layer 11 may include a first reflective region 110, a second reflective region 111, and a third reflective region 112, where the first reflective region 110 is installed corresponding to the first light emitting region 120, and the second The reflective region 111 is installed corresponding to the second light emitting region 121, and the third reflective region 112 is installed corresponding to the third light emitting region 122, that is, in the direction perpendicular to the wavelength conversion sheet 1, The projection of 110 overlaps the projection of the first light emitting region 120, the projection of the second reflective region 111 overlaps the projection of the second light emitting region 121, and the projection of the third reflective region 112 projects to the projection of the third light emitting region 122. It overlaps with.

  In addition, the thickness of the first reflective region 110 is smaller than the thickness of the second reflective region 111, and the thickness of the first reflective region 110 is smaller than the thickness of the third reflective region 112. Preferably, the range of the difference between the thickness of the first reflective region 110 and the thickness of the second reflective region 111 is 0.02 mm or greater and 0.06 mm or less, and the thickness of the first reflective region 110 and the thickness of the third reflective region 112 is The range of the difference is 0.02 mm or more and 0.06 mm or less. Note that the thickness of the second reflective region 111 may or may not be equal to the thickness of the third reflective region 112. The specific thickness value can be set according to the wavelength conversion material of the corresponding light emitting region and the actual demand.

  Specifically, the wavelength conversion material included in the first light emitting region 120 may be a red phosphor powder, the wavelength conversion material included in the second light emitting region 121 may be a blue phosphor powder, and the third light emitting region. The wavelength conversion material 122 has may be a green phosphor powder, and of course, the present invention is not limited to this.

  In another embodiment of the present invention, when the excitation light source is a blue light source, the wavelength conversion material included in the first light emitting region 120 may be a red phosphor powder, and the second light emitting region 121 includes. The wavelength conversion material may be green phosphor powder, the third light emitting region 122 may be a light reflecting region, and the light reflecting region is made of a transparent material or a reflecting material, and is blue light that is excitation light. The reflected blue light can be combined into red light and green light and white light, where the reflective material is similar to the material of the reflective layer Alternatively, other reflective materials well known in the art may be used. Similarly, the thickness of the first reflective region 110 may be smaller than the thickness of the second reflective region 111, and the thickness of the first reflective region 110 may be smaller than the thickness of the third reflective region 112. The range of the difference between the thickness of the first reflective region 110 and the thickness of the second reflective region 111 and the range of the difference between the thickness of the first reflective region 110 and the thickness of the third reflective region 112 are both 0.02 mm or more. 0.06 mm or less.

  The light emitting layer 12 may further include four to more than four light emitting regions. For example, the light emitting layer 12 includes a red phosphor powder region, a green phosphor powder region, a blue phosphor powder region, and the like. A yellow phosphor powder region may be provided, and the present invention is not limited to this. Correspondingly, the thickness of the reflective layer can be set according to the specific wavelength conversion material of the light emitting region.

  The light emitting layer 12 is not limited to the visible light emitting region, but may include a region of infrared phosphor powder for infrared imaging.

  Furthermore, the reflective layer 11 according to the present embodiment may include an irregular reflection layer 113 and a heat dissipation layer 114 located on one side of the irregular reflection layer 113 away from the light emitting layer 12. As shown in FIG. 6, the reflective layer 11 may be a ceramic reflective layer. Preferably, the thickness of the reflective ceramic is in the range of 0.1 mm to 1.5 mm.

  In the reflective layer 11, the reflective layer corresponding to a part of the light emitting region may be a reflective ceramic, and the reflective layer corresponding to the part of the light emitting region may be an irregular reflection layer and a heat dissipation layer. The reflective layer corresponding to the light emitting region is reflective ceramics, and the reflective layers corresponding to the other light emitting regions are the irregular reflection layer and the heat dissipation layer. As shown in FIG. 2, the reflective layer corresponding to the light emitting region 121 having the blue phosphor powder or the green phosphor powder is a reflective ceramic, and the reflective layer corresponding to another light emitting region, for example, the light emitting region 120, is a diffuse reflective layer. It may be a heat dissipation layer.

  Here, the irregular reflection layer 113 is made of a glass body that adheres the white scattering particles and the scattering particles, and the heat dissipation layer 114 is a high heat dissipation aluminum nitride ceramic. The reflective ceramics may be highly reflective white ceramics, and may be alumina ceramics, zirconium oxide ceramics, boron oxide ceramics, or composite ceramics in which zirconium oxide is doped with alumina.

  Since the wavelength conversion device provided by this embodiment has different thermal effects of different wavelength conversion materials, the reflective layer corresponding to the light emitting region that generates a lot of heat is thinned, and the reflective layer corresponding to the light emitting region that generates a little heat is provided. Thus, the heat dissipation and reflection performance of the phosphor powder layer can be satisfied, the reflectance of the reflection layer can be improved, and the light emission efficiency of the wavelength conversion device can be improved.

  According to another embodiment of the present invention, a light source system is further provided. The light source system includes an excitation light source and the wavelength converter provided by any one of the above embodiments, and the excitation light emitted from the excitation light source is When the light emitting layer of the wavelength conversion device is irradiated, at least two kinds of excited light of different colors are excited, and after these different colored excited lights are reflected by the reflective layer, they enter a condenser lens at the subsequent stage, The light is condensed and collimated, and is synthesized into one white light used for the projection image.

  According to another embodiment of the present invention, a projection system is further provided. The projection system includes a light splitting light synthesis system, a light modulation system that modulates light, and the like in addition to the light source system.

  The light source system and the projection system provided in this embodiment are different in the thickness of the reflective layer corresponding to different light emitting regions, so that the heat dissipation and stability of the phosphor powder layer are satisfied and the reflectance of the reflective layer is improved. , Improve the luminous efficiency of the wavelength conversion device.

  Each embodiment in this specification has been described in a progressive manner, and each embodiment will be described with a focus on the differences from the other embodiments, and similar / similar parts between each embodiment will be described. May be referred to each other. The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. For this reason, the present invention is not limited to these embodiments shown in the present application, but is adapted to the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

A wavelength conversion device comprising a wavelength conversion sheet,
The wavelength conversion sheet includes a reflective layer and a light emitting layer located on one surface of the reflective layer,
The light emitting layer includes at least two light emitting regions, different light emitting regions have different wavelength conversion materials, and the thickness of the reflective layer corresponding to at least one of the light emitting regions corresponds to the other light emitting regions. A wavelength converter having a thickness smaller than that of the reflective layer. The light emitting layer includes a first light emitting region and a second light emitting region,
The reflective layer includes a first reflective region and a second reflective region, the first reflective region is installed corresponding to the first light emitting region, and the second reflective region corresponds to the second light emitting region. The wavelength conversion device according to claim 1, wherein a thickness of the first reflection region is smaller than a thickness of the second reflection region.   The wavelength according to claim 2, wherein the wavelength conversion material of the first light emitting region is a red phosphor powder, and the wavelength conversion material of the second light emitting region is a yellow phosphor powder or a green phosphor powder. Conversion device.   The light emitting layer further includes a third light emitting region, the reflective layer further includes a third reflective region, the third reflective region is disposed corresponding to the third light emitting region, and a thickness of the first reflective region. The wavelength conversion device according to claim 2, wherein is smaller than a thickness of the third reflection region.   The wavelength conversion material of the first light emitting region is a red phosphor powder, the wavelength conversion material of the second light emitting region is a blue phosphor powder, and the wavelength conversion material of the third light emitting region is a green phosphor. The wavelength converter according to claim 4, wherein the wavelength converter is powder.   The light emitting layer further includes a light reflecting region, the reflecting layer further includes a third reflecting region, the third reflecting region is installed corresponding to the light reflecting region, and the light reflecting region is a transparent material or a reflecting material. The wavelength converter according to claim 2, comprising:   The reflection layer is an irregular reflection layer, and a heat dissipation layer is provided on the surface of the irregular reflection layer on one side away from the light emitting layer, or the reflection layer is a reflection ceramic, and the reflection ceramic is an alumina ceramic, The wavelength conversion device according to any one of claims 1 to 6, wherein the wavelength conversion device is a composite ceramic obtained by doping zirconium oxide ceramics, boron oxide ceramics, or zirconium oxide with alumina.   The difference between the thickness of the reflective layer corresponding to at least one of the light emitting regions and the thickness of the reflective layer corresponding to the other light emitting regions is 0.02 mm or more and 0.06 mm or less. 8. The wavelength conversion device according to 7.   The reflective layer corresponding to at least one of the light emitting regions is reflective ceramics, the reflective layer corresponding to the other light emitting regions is an irregular reflection layer, and a heat dissipation layer is formed on the surface of the irregular reflection layer on one side away from the light emitting layer. The wavelength conversion according to claim 1, wherein the reflective ceramic is alumina ceramic, zirconium oxide ceramic, boron oxide ceramic, or composite ceramic in which zirconium oxide is doped with alumina. apparatus.   A light source system comprising an excitation light source and the wavelength conversion device according to claim 1.   A projection system comprising the light source system according to claim 10.

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