WO2019136834A1

WO2019136834A1 - Wavelength conversion device and preparation method therefor, light source device, and projection equipment

Info

Publication number: WO2019136834A1
Application number: PCT/CN2018/080882
Authority: WO
Inventors: 徐梦梦; 余新; 胡飞; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2018-01-11
Filing date: 2018-03-28
Publication date: 2019-07-18
Also published as: CN110032030A; CN110032030B

Abstract

The present invention provides a wavelength conversion device, comprising a meniscus lens unit and a wavelength conversion unit. The wavelength conversion unit is accommodated in a groove of the meniscus lens unit; one surface of the wavelength conversion unit is attached to the groove; the thickness of the wavelength conversion unit is reduced from a center area to the edge of the periphery. The present invention further provides a light source device, projection equipment, and a preparation method for the wavelength conversion device. The present invention can effectively improve the situation of uneven light color of emergent light spots.

Description

Wavelength conversion device, preparation method thereof, light source device, projection device

Technical field

The present invention relates to the field of projection display technologies, and in particular, to a wavelength conversion device, a method for fabricating the same, a light source device, and a projection device.

Background technique

In the projection device, the light source generally uses a blue laser chip or a blue LED chip as an excitation light source to excite the wavelength conversion device to obtain desired light. For example, a part of the blue light can be converted into yellow light by a wavelength conversion device, and mixed with the remaining blue light to obtain white light. When the blue light passes through the existing wavelength conversion device, the optical path of the blue excitation light passing through the edge region of the wavelength conversion material is larger than the optical path of the blue excitation light passing through the central region of the wavelength conversion material, and the blue light passing through the edge of the wavelength conversion material is relative to the passing wavelength. The blue light in the central region of the conversion material is more absorbed and converted.

technical problem

Therefore, the proportion of blue light in the central region and the edge region of the exit spot is different, which causes an obvious yellow aperture phenomenon at the edge of the exit spot, so it is necessary to improve the wavelength conversion device.

Technical solution

In view of this, the present invention provides a wavelength conversion device capable of effectively improving the unevenness of the emitted spot light color, and the present invention also provides a method of preparing the wavelength conversion device, and a light source device and a projection device.

A first aspect of the present invention provides a wavelength conversion device including a meniscus lens unit and a wavelength conversion unit, wherein the wavelength conversion unit is housed in a groove of the meniscus lens unit, a surface of the wavelength conversion unit and the concave surface The groove is fitted, and the thickness of the wavelength conversion unit is decreased from the central region to the peripheral edge.

A second aspect of the invention provides a light source device comprising the wavelength conversion device.

The present invention also provides a light source device, the light source device comprising a light source, a collecting lens, and the wavelength converting device, wherein the light emitted by the light source device passes through the collecting lens and is focused near the wavelength conversion unit, and The wavelength conversion unit performs wavelength conversion to obtain a laser beam, and the received laser light passes through the meniscus lens unit and is emitted.

The present invention also provides a light source device, the light source device comprising a light source, a collecting lens, a spectroscopic filter, and the wavelength converting device, wherein the light emitted by the light source device passes through the collecting lens and is focused on the spectroscopic filter. In the vicinity of the light sheet, the spectroscopic lens unit and the wavelength conversion unit are sequentially reflected by the spectroscopic filter, and the wavelength conversion is performed by the wavelength conversion unit, passes through the reflective layer, and sequentially passes through the wavelength conversion. The unit and the meniscus lens unit enter the spectroscopic filter and exit.

A projection apparatus according to a third aspect of the invention is the light source apparatus of the projection apparatus.

A method of fabricating a wavelength conversion device according to a fourth aspect of the invention, the method comprising the steps of:

Providing a meniscus lens unit;

Filling a groove of the lenticular lens unit with a wavelength conversion slurry;

The wavelength converting paste is cured to form a wavelength converting unit, wherein a thickness of the wavelength converting unit is decreased from a central region to a peripheral edge.

Beneficial effect

Compared with the prior art, the wavelength conversion device of the present invention includes a meniscus lens unit and a wavelength conversion unit. The wavelength conversion unit is received in the groove of the meniscus lens unit, and a surface of the wavelength conversion unit is attached to the groove. The thickness of the wavelength conversion unit is decreased from the central region to the peripheral edge, and the optical path of the excitation light passing through the edge region of the wavelength conversion material can be reduced, and the optical path difference between the edge and the central region can be reduced, so that the edge region of the wavelength conversion material is passed. The excitation light in the central region is close to the ratio of absorption and conversion, so that the uneven color of the emitted spot light can be effectively improved, and the lenticular lens unit can be used as a support for the wavelength conversion unit to facilitate the formation of the wavelength conversion unit. The meniscus lens unit can also function as a light extraction element to improve light extraction efficiency.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are some embodiments of the present invention. For the ordinary technicians, other drawings can be obtained based on these drawings without any creative work.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a first schematic structural view of a wavelength conversion device according to a first embodiment of the present invention.

Fig. 2 is a second schematic structural view of a wavelength conversion device according to a first embodiment of the present invention.

Fig. 3 is a third schematic structural view of a wavelength conversion device according to a first embodiment of the present invention.

Fig. 4 is a schematic structural view of a light source device according to a first embodiment of the present invention.

Fig. 5 is a first schematic structural view of a wavelength conversion device according to a second embodiment of the present invention.

Fig. 6 is a view showing a second configuration of a wavelength conversion device according to a second embodiment of the present invention.

Fig. 7 is a third schematic structural view of a wavelength conversion device according to a second embodiment of the present invention.

Fig. 8 is a schematic structural view of a light source device according to a second embodiment of the present invention.

Figure 9 is a flow chart showing the preparation method of the first embodiment of the wavelength conversion device of the present invention.

Figure 10 is a flow chart showing a method of preparing a second embodiment of the wavelength conversion device of the present invention.

主要元件符号说明Main component symbol description

Wavelength conversion device 10, 20

Concave lens unit 11

Convex 111

Concave surface 112

Groove 113

Wavelength conversion unit 12

First surface 121

Second surface 122

Reflective layer 13

Light source device 100, 200

Light source 110, 210

Condenser lens 120, 220

Collection lens 130, 230

Spectroscopic filter 230

Step S11, S12, S13, S21, S22, S23, S24, S25

The invention will be further illustrated by the following detailed description in conjunction with the accompanying drawings.

Embodiments of the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. It is to be understood that the appended drawings are not intended to The connections shown in the figures are only for the sake of clarity and are not intended to be limiting.

It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to another component or a central component can be present at the same time.

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 invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention.

First embodiment

Referring to FIG. 1-3, FIG. 1-3 are schematic structural diagrams of a wavelength conversion device 10 of different structures according to a first embodiment of the present invention. The wavelength conversion device 10 includes a meniscus lens unit 11 and a wavelength conversion unit 12, and the meniscus lens unit 11 can function as a support for the wavelength conversion unit 12 to function as a mold and a support.

The lenticular lens unit 11 includes a convex surface 111 and a concave surface 112 on the opposite side of the convex surface 111. The convex radii of the convex surface 111 and the concave surface 112 may be the same or different. For example, the convex surface 111 And the concave surface 112 may be a spherical surface having the same or different radius, the concave surface 112 is formed with a groove 113, and one surface of the wavelength conversion unit 12 is attached to the groove 113 to convert the wavelength. There is no air gap between the unit 12 and the meniscus lens unit 11, and the refractive index of the meniscus lens unit 11 may coincide with the refractive index of the wavelength conversion unit 12, wherein the coincidence may be the same or substantially the same The absolute value of the refractive index difference between them is not higher than 0.3, or the refractive index of the meniscus lens unit 11 may be larger than the refractive index of the wavelength conversion unit 12, and therefore, the meniscus lens unit 11 can be used as The light extraction element can effectively avoid the problem of low light extraction efficiency caused by total reflection of the surface of the wavelength conversion unit 12, and improve light extraction efficiency.

The thickness of the wavelength conversion unit 12 is decreased from the central region to the periphery of the periphery, and the central region of the wavelength conversion unit 12 may include the center of the wavelength conversion unit 12, and the wavelength conversion device 10 may be excited when in use. The center of the spot on which the light is incident on the wavelength conversion unit 12 is aligned at the position where the thickness is the largest in the central region. In a preferred embodiment, the maximum thickness of the wavelength conversion unit 12 may be the wavelength. The main optical axis of the conversion unit 12, the main optical axis of the meniscus lens unit 11 and the main optical axis of the wavelength conversion unit 12 may be coincident, for example, light emitted by a laser light source is shaped by an optical element such as a collimating lens. The wavelength conversion unit 12, which is incident on the thickness from the central region toward the periphery, reduces the optical path difference of the light at the edge and the central region of the wavelength conversion unit 12, and improves the wavelength conversion of the light in the existing wavelength conversion device. When the optical path of the edge is larger than the optical path of the central region, the uniformity of the spot is low.

The light emitted from the laser light source is incident on the wavelength conversion unit 12, and after a long period of time, the temperature of the wavelength conversion unit 12 is high, and the lifetime of the wavelength conversion unit 12 at a relatively high temperature for a long time is short, in this embodiment. The lenticular lens unit 11 may be made of a high thermal conductivity material, preferably having a thermal conductivity of more than 5 W/m·K, and more preferably having a thermal conductivity of 10 W/m·K or more, which may improve the wavelength conversion unit 12 . The heat dissipation effect increases the life of the wavelength conversion unit 12.

The wavelength conversion unit 12 may be a silica gel package or a glass-encapsulated YAG (yttrium aluminum garnet): Ce fluorescent material, and may also be doped with white particles such as Al ₂ O ₃ , TiO ₂ or the like as scattering particles.

The wavelength conversion unit 12 may include a first surface 121 and a second surface 122 on an opposite side of the first surface 121, an edge of the first surface 121 and an edge of the second surface 122. The intersection of the first surface 121 and the second surface 122 may be adjacent or coincident with the edge of the groove 113, and the thickness of the wavelength conversion unit 12 at the position of the main optical axis is the largest, and the interface is gradually transferred. Reduced. In this embodiment, the second surface 122 can serve as an incident surface of the wavelength conversion unit 12, and the first surface 121 can serve as an exit surface of the wavelength conversion unit 12, wherein the first surface 121 is convex. The first surface 121 is in contact with the groove 113. The laser light source enters the wavelength conversion unit 12 from the second surface 122 of the wavelength conversion unit 12 for wavelength conversion, and then exits from the first surface 121 of the wavelength conversion unit 12, and the meniscus lens unit 11 as a light extraction element is extracted from the first surface 121. The emitted light is emitted from the convex surface 111 of the meniscus lens unit 11.

In this embodiment, the second surface 122 may be a flat surface, a convex surface or a concave surface. As shown in FIG. 1 , FIG. 2 and FIG. 3 , respectively, the second surface 122 is preferably a flat surface, which is more convenient for the wavelength conversion unit 12 to be fabricated. .

The wavelength conversion device 10 of the present embodiment can be applied to the light source device 100. As shown in FIG. 4, the light source device 100 includes a light source 110, a collecting lens 120, the wavelength converting device 10, and a collecting lens 130, wherein the light source 110 A laser source such as a laser source that emits blue light can be used. The light emitted by the light source 110 is focused by the condensing lens 120 and is focused near the wavelength conversion unit 12, and is incident from the second surface 122 of the wavelength conversion unit 12 into the wavelength conversion unit 12, passing through the edge of the wavelength conversion unit 12. The optical path length of the light is reduced compared to the conventional wavelength conversion device 10, and the optical path difference between the edge and the center is reduced, and the light emitted by the wavelength conversion unit 12 can be uniformly mixed to improve the uneven color of the emitted spot light. Phenomenon; after the light is extracted by the meniscus unit 11 and incident on the collecting lens 130, the light extraction efficiency can be improved.

In the light source device 100 provided by the present embodiment, the light intensity of the emitted spot is uniform, and when the blue excitation light is used as the excitation light, the yellow circle at the edge of the exit spot can be effectively avoided. The light source device 100 provided by the present embodiment can be applied to a projection device, and the display effect of the projection screen of the projection device can be improved.

Second embodiment

Please refer to FIG. 5-7, which are structural diagrams of the wavelength conversion device 20 of different structures according to the second embodiment of the present invention, respectively. The main difference between this embodiment and the first embodiment is that the present embodiment further includes a reflective layer 13. The wavelength conversion device 20 provided in this embodiment is a reflective structure. It should be understood that the specific embodiments in the first embodiment The embodiment can be applied to the present embodiment accordingly.

As shown in FIG. 5-7, a reflective layer 13 is disposed on the second surface 122 of the wavelength conversion unit 12, and the reflective layer 13 may cover the surface of the lenticular lens unit 11 on the same side as the second surface 122. The reflective layer 13 may be a white particulate material such as Al ₂ O ₃ or TiO ₂ encapsulated in a silica gel or a glass. The laser light source is incident from the convex surface 111 of the meniscus unit 11, passes through the meniscus unit 11, and is incident from the first surface 121 of the wavelength conversion unit 12 to the wavelength conversion unit 12 for wavelength conversion, and the excitation light that has not been converted by the wavelength conversion unit 12 is again After being emitted from the second surface 122, reflected by the reflective layer 13 and then subjected to wavelength conversion by the wavelength conversion unit 12, and after being emitted through the meniscus lens unit 11 together with the converted excitation light, the wavelength of the wavelength conversion unit 12 is not only uniform, but the light color is uniform. And the wavelength conversion efficiency is good.

The wavelength conversion device 20 of the present embodiment can be applied to the light source device 200. As shown in FIG. 8, the light source device 200 includes a light source 210, a collecting lens 220, a spectroscopic filter 230, the wavelength conversion device 20, and collection. Lens 240, wherein light source 210 can employ a laser source, such as a laser source that emits blue light. The light emitted by the light source 210 passes through the collecting lens 220 and is focused on the vicinity of the spectroscopic filter 230. The spectroscopic filter 230 reflects the light to the collecting lens 240 and then enters the wavelength converting device 20 from the meniscus unit 11. The convex surface 111 is incident, passes through the meniscus unit 11, and is incident from the first surface 121 of the wavelength conversion unit 12 to the wavelength conversion unit 12 for wavelength conversion, and the excitation light that has not been converted by the wavelength conversion unit 12 is again emitted from the second surface 122. The reflective layer 13 reflects and then undergoes wavelength conversion by the wavelength conversion unit 12, passes through the lenticular lens unit 11 together with the converted excitation light, and then exits from the convex surface 111, and the emitted light can be transmitted or emitted from the spectral filter 230 in whole or in part.

In the light source device 200 provided by the present embodiment, the wavelength conversion efficiency is good, and the light spot color of the emitted spot is uniform. When the blue excitation light is used as the excitation light, the yellow circle at the edge of the exit spot can be effectively avoided. The light source device 100 provided by the present embodiment can be applied to a projection device, and the display effect of the projection screen of the projection device can be improved.

Third embodiment

As shown in FIG. 9, FIG. 9 is a flowchart of a method for fabricating a wavelength conversion device according to an embodiment of the present invention. The preparation of the wavelength conversion device provided in this embodiment may include the following steps:

S11: Providing a meniscus lens unit.

The lenticular lens unit 11 is used as a support. The lenticular lens unit 11 may include a convex surface 111 and a concave surface 112 on the opposite side of the convex surface 111. The convex surface 111 and the curvature of the concave surface 112 The radius may be the same or different, and the concave surface 112 is formed with a groove 113 as a cavity.

The meniscus lens unit 11 can be made of a high thermal conductivity material, the thermal conductivity is preferably greater than 5 W/m·K, and more preferably the thermal conductivity is greater than or equal to 10 W/m·K, which can improve the position obtained in step S103. The heat dissipation effect of the wavelength conversion unit 12 increases the lifetime of the wavelength conversion unit 12.

S12: filling a groove of the lenticular lens unit with a wavelength conversion slurry.

A silica gel or glass frit paste containing an appropriate amount of fluorescent material (such as YAG:Ce fluorescent material) may be firstly disposed, and white particles such as Al ₂ O ₃ and TiO ₂ may be added as scattering particles in a silica gel or a glass frit paste, which will be subjected to blade coating. The wavelength conversion slurry fills the groove 12 of the meniscus unit 11.

S13: The wavelength conversion slurry is cured to form a wavelength conversion unit, wherein a thickness of the wavelength conversion unit is decreased from a central region to a peripheral edge.

The slurry after curing (such as heat curing or sintering) forms a wavelength conversion unit, one side of the wavelength conversion unit is attached to the groove 112 of the meniscus lens unit, and the refractive index of the wavelength conversion unit and the meniscus lens unit The refractive index may be substantially the same (eg, their absolute value is within 0.3), or the refractive index of the meniscus lens unit is not lower than the refractive index of the wavelength conversion unit, such that the meniscus lens unit 11 can be used as light extraction The element extracts light that has been wavelength-converted by the wavelength conversion unit 12.

Fourth embodiment

In the preparation method of the wavelength conversion device provided in this embodiment, the main difference from the preparation method in the third embodiment is that the embodiment further includes the step of preparing a reflective layer. The specific solutions that are applicable to the third embodiment can also be applied to the present embodiment accordingly. To save space and avoid duplication, no further details are provided herein.

This embodiment may include the following steps:

S21: Providing a meniscus lens unit.

S22: filling a groove of the lenticular lens unit with a wavelength conversion slurry.

S23: The wavelength conversion slurry is cured to form a wavelength conversion unit, wherein a thickness of the wavelength conversion unit is decreased from a central region to a peripheral edge.

S24: coating a light-reflecting material of a certain thickness on the exposed surface of the wavelength conversion unit.

In this step, a certain thickness of the light reflective material such as silica gel or glass-encapsulated white granular material such as Al ₂ O ₃ or TiO ₂ may be coated on the second surface of the wavelength conversion unit by a doctor blade.

S25: The light reflective material is cured to form a reflective layer.

The wavelength conversion device 20 provided in this embodiment has a reflective structure, and not only the light spot color of the emitted spot is uniform, but also the wavelength conversion efficiency is good.

In the specification and claims of the present application, the words "include/comprise" and the words "comprising" or "comprising", and variations thereof, are used to designate the presence of the recited features, values, steps or components, but do not exclude the presence or addition of one or A number of other features, values, steps, components, or combinations thereof.

Some of the features of the present invention are described in the different embodiments for clarity of illustration, and these features may also be described in combination with a single embodiment. Rather, some of the features of the invention are described in a single embodiment for the sake of brevity, however, these features may also be described separately or in any suitable combination in different embodiments.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

A wavelength conversion device comprising: a meniscus lens unit and a wavelength conversion unit, wherein the wavelength conversion unit is housed in a groove of the meniscus lens unit, a surface of the wavelength conversion unit and the concave surface The groove is fitted, and the thickness of the wavelength conversion unit is decreased from the central region to the peripheral edge.

The wavelength conversion device according to claim 1, wherein a reflective layer is provided on the other surface of the wavelength conversion unit on the opposite side of the one surface.

The wavelength conversion device according to claim 1 or 2, wherein the other surface of the wavelength conversion unit on the opposite side of the one surface is a concave surface, a flat surface or a convex surface.

The wavelength conversion device according to claim 1 or 2, wherein a refractive index of the meniscus lens unit coincides with a refractive index of the wavelength conversion unit, or a refractive index of the meniscus lens unit is not low The refractive index of the wavelength conversion unit.

The wavelength conversion device according to claim 1 or 2, wherein the meniscus lens unit is made of a material having a high thermal conductivity.

A light source device, characterized in that the light source device comprises the wavelength conversion device according to any one of claims 1-5.

A light source device, comprising: a light source, a collecting lens, and a wavelength converting device according to claim 1, wherein light emitted from the light source device is focused on the wavelength after passing through a collecting lens In the vicinity of the conversion unit, wavelength conversion is performed from the wavelength conversion unit to obtain a laser beam, and the laser beam is emitted through the meniscus lens unit.

A light source device, comprising: a light source, a collecting lens, a spectroscopic filter, and the wavelength converting device according to claim 2, wherein the light emitted by the light source device passes through the collecting lens Focusing on the vicinity of the spectroscopic filter, and sequentially entering the lenticular lens unit and the wavelength conversion unit by the spectroscopic filter, performing wavelength conversion by the wavelength conversion unit, passing through the reflective layer, and then sequentially After passing through the wavelength conversion unit and the meniscus lens unit, the spectroscopic filter enters and exits.

A projection apparatus, characterized in that the projection apparatus comprises the light source apparatus according to any one of claims 6-8.

10. A method of fabricating a wavelength conversion device, the method comprising the steps of:

Providing a meniscus lens unit;

The method of claim 10, wherein after the forming the wavelength conversion unit after curing, the method further comprises:

Coating a certain thickness of the light reflective material on the exposed surface of the wavelength conversion unit;

The light reflective material is cured to form a reflective layer.

The method of manufacturing the wavelength conversion device according to claim 10 or 11, wherein the filling the wavelength conversion slurry in the groove of the meniscus lens unit comprises:

The wavelength converting paste is filled in the groove of the meniscus lens unit by a doctor blade method.

The method of manufacturing a wavelength conversion device according to claim 10 or 11, wherein a refractive index of the meniscus lens unit coincides with a refractive index of the wavelength conversion unit, or a refraction of the meniscus lens unit The rate is not lower than the refractive index of the wavelength conversion unit.

The method of manufacturing a wavelength conversion device according to claim 10 or 11, wherein the meniscus lens unit is made of a material having a high thermal conductivity.