CN212112106U

CN212112106U - Light guide element and light source device

Info

Publication number: CN212112106U
Application number: CN202020596406.1U
Authority: CN
Inventors: 方元戎; 郭祖强; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-12-08
Anticipated expiration: 2030-04-20
Also published as: WO2021213195A1

Abstract

The application discloses light guide element and light source device, this light guide element includes first region and the second region that lies in first region relative both sides respectively, and the first region is used for reflecting at least partly first light and passes through the second light, and the second region is used for passing through first light and second light, and wherein, the wavelength range of first light and the wavelength range of second light are different. Through the mode, the light emitting efficiency can be improved, and the cost is reduced.

Description

Light guide element and light source device

Technical Field

The present application relates to the field of display technologies, and in particular, to a light guide element and a light source device.

Background

The existing laser fluorescence white light source can be used as a light source in projection display and can also be used for stage lamps or spot lights, the laser fluorescence white light source comprises an area diaphragm, the area diaphragm comprises a coating area positioned in the center and a second area positioned at the periphery, the synthesized white light has at least 2.5% loss when passing through the second area, and the light-emitting efficiency is reduced because the area of the second area is larger and the loss light is more; in addition, because the film coating area is arranged in the central area of the area diaphragm, when in film coating, a mask needs to be independently used for each diaphragm, and the area which does not need film coating is much larger than the area which needs film coating, thereby greatly reducing the production efficiency and causing the waste of cost.

SUMMERY OF THE UTILITY MODEL

The application provides a light guide element and a light source device, which can improve the luminous efficiency and reduce the cost.

In order to solve the technical problem, the technical scheme adopted by the application is as follows: there is provided a light-guiding element comprising: the light source comprises a first area and second areas respectively positioned on two opposite sides of the first area, wherein the first area is used for reflecting at least part of first light and transmitting second light, and the second areas are used for transmitting the first light and the second light, and the wavelength range of the first light is different from that of the second light.

In order to solve the above technical problem, another technical solution adopted by the present application is: provided is a light source device including: the light source is used for generating first light; the light guiding element is arranged on the light path of the first light and comprises a first area and second areas which are respectively positioned at two opposite sides of the first area, the first area is used for reflecting at least part of the first light and transmitting the second light, and the second area is used for transmitting the first light and the second light; the wavelength conversion device is used for receiving the first light reflected by the light guide element and converting at least part of the first light into second light, and the second light is transmitted and emitted through the first area and the second area, wherein the wavelength range of the first light is different from that of the second light.

Through the scheme, the beneficial effects of the application are that: since the second regions for transmitting light are provided only on the opposite sides of the first region, the area of the second regions can be reduced, so that the amount of emitted light transmitted through the second regions is reduced, and light loss is reduced; when the light guide element is processed, the light guide elements can share one mask, the light guide elements can be obtained by cutting, the processing technology can be simplified, the production efficiency can be obviously improved, the production cost is reduced, and the luminous efficiency of the light source device is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

FIG. 1 is a schematic structural diagram of an embodiment of a light directing element provided herein;

FIG. 2 is a schematic view of the layer structure of the light directing element in the embodiment shown in FIG. 1;

FIG. 3 is a schematic diagram of an arrangement of a plurality of light directing elements in the embodiment shown in FIG. 1;

FIG. 4 is a schematic structural diagram of an embodiment of a light source apparatus provided in the present application;

FIG. 5 is a schematic structural diagram of another embodiment of a light source device provided in the present application;

FIG. 6 is a schematic view of a first configuration of a wavelength conversion device in the embodiment shown in FIG. 5;

fig. 7 is a schematic diagram of a second structure of the wavelength conversion device in the embodiment shown in fig. 5.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

When light is reflected and transmitted on the medium surface, the vibration can be decomposed into a component (S component) perpendicular to the incident surface and a component (P component) parallel to the incident surface, and the reflectance of natural light (the sum of S light and P light) increases with increasing incident angle, and conversely, the transmittance of natural light decreases with increasing incident angle.

Because the white light can be utilized by a subsequent optical system after passing through the regional diaphragm after being emitted, the light source design using the regional diaphragm is all in a way of coating on a glass plate at present, when the periphery of the regional diaphragm is a light-transmitting surface, the light source design can only have 97.5% transmittance after being coated with an AR (Anti-Reflection) film, and the regional coating consumes more time in the process and has higher cost.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a light guiding device provided in the present application, in which a light guiding device 10 includes a first region 11 and second regions 12 respectively located at two opposite sides of the first region 11. In the present embodiment, the first region 11 and the second region 12 are rectangular, the first region 11 has an upper side and a lower side opposite to each other, one of the second regions 12 is located on the upper side of the first region 11, and the other one of the second regions 12 is located on the lower side of the first region 11, that is, the first region 11 is located in the middle region of the light guiding element 10, and the light guiding element 10 extends in the up-and-down direction. Of course, the two second regions 12 may be located on the left and right sides of the first region 11, respectively, and in this case, the light guide element 10 extends in the left-right direction. Preferably, the width of the first region 11 is the same as the width of the second region 12 in a direction perpendicular to the extension direction of the light-guiding element 10, so that the light-guiding element 10 forms a complete rectangle, which makes the light-guiding element 10 easy to cut and separate during processing.

It will be appreciated that the width of the second region 12 may also be different from the width of the first region 11, and the width between two second regions 12 may also be different, depending on the particular application requirements. The shape of the first region 11 and the second region 12 is not limited to a rectangle, and may be other polygonal shapes such as a circle, a triangle, a trapezoid, and a hexagon. The first region 11 and the second region 12 may have different shapes.

The first region 11 is used for reflecting at least part of first light and transmitting second light, the wavelength range of the first light is different from that of the second light, the first light and the second light can be monochromatic light, for example, the first light can be blue light, and the second light can be yellow light; specifically, the first region 11 is configured to reflect the first light with the first polarization state and transmit the first light with the second polarization state, for example, the first light with the first polarization state includes S-polarized blue light, and the first light with the second polarization state includes P-polarized blue light.

The second region 12 is an uncoated region, and may be a glass sheet, capable of transmitting light of all wavelengths, and in particular, transmitting the first light and the second light.

In one specific embodiment, as shown in fig. 2, the first region 11 includes a first transparent substrate 111 and an optical coating 112 disposed on the first transparent substrate 111, and the second region 12 includes a second transparent substrate 121; the first transparent substrate 111 and the second transparent substrate 121 may be integrally formed, or made of different materials.

The light guide element 10 in this embodiment can be applied to a 3LCD (Liquid Crystal Display) white light source as a light splitter, the transparent second regions 12 on the two opposite sides of the first region 11 are reserved to facilitate fixing of the structure, and since the second regions 12 for transmitting light are only arranged on the two opposite sides of the first region 11, the area of the second regions 12 can be reduced, so that light passes through the second regions 12 with the transmittance of only 97.5% as little as possible, thereby improving the efficiency of the light source.

When the light guide element 10 is processed, as shown in fig. 3, a plurality of light guide elements 10 may share one mask, and after the coating is completed, a plurality of light guide elements 10 may be obtained by cutting, which can significantly improve the production efficiency and reduce the cost.

Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of a light source device provided in the present application, where the light source device 40 includes: a light source 41, a light guiding element 42 and a wavelength conversion device 43.

The light source 41 is used to generate the first light, and the light source 41 may be a laser.

The light guiding element 42 is disposed on the optical path of the first light, and includes a first region 421 and second regions 422 respectively disposed at two opposite sides of the first region 421, for reflecting at least a portion of the first light and transmitting a second light, wherein the wavelength range of the first light is different from that of the second light; the second region 422 may allow light beams of all wavelengths to pass through, and specifically, the second region 422 is used to transmit the first light and the second light, and the light guiding element 42 is the light guiding element in the above-described embodiment.

Further, the first region 421 is configured to reflect the first light with the first polarization state and transmit the first light with the second polarization state, for example, the first light with the first polarization state includes S-polarized blue light, and the first light with the second polarization state includes P-polarized blue light.

The wavelength conversion device 43 is disposed on the optical path of the first light, and is configured to receive the first light reflected by the light guiding element 42 and convert at least part of the first light into a second light, and the second light is transmitted and emitted through the first region 421 and the second region 422; specifically, the first light is reflected by the light guiding element 42 to the wavelength conversion device 43, the wavelength conversion device 43 may be a phosphor color wheel, the wavelength conversion device 43 is provided with a fluorescent conversion material, and the second light may be fluorescent light, for example, yellow fluorescent light.

The light emitted by the light source device 40 is composed of the first light generated by the light source 41 and the second light emitted by the wavelength conversion device 43, when the first light is incident on the light guide element 42, at least part of the first light is reflected by the first region 421 to the wavelength conversion device 43, the fluorescent conversion material in the wavelength conversion device 43 is excited, so as to generate corresponding second light, the second light can be transmitted through the first region 421 and the second region 422, while the part of the first light which does not excite the fluorescent material can be combined with the fluorescent light into white light, and due to the reduction of the area of the second region 422, the part of the white light which passes through the second region 422 is reduced, and the white light outside the area of the light guide element 42 can be emitted, so that the light emitting efficiency of the light source device 40 can be improved without damage.

Referring to fig. 5, fig. 5 is a schematic structural diagram of another embodiment of a light source device provided in the present application, and the light source device 50 includes: a light source 51, a light guiding element 52, a wavelength conversion device 53, positive and negative lenses 54, a light unifying device 55, and a collecting lens 56.

The light source 51 may be a blue laser, which emits blue laser light through positive and negative lenses 54, and the positive and negative lenses 54 are disposed on the optical path of the second light, and are configured to compress the second light and emit the compressed second light into the light uniformizing device 55.

The dodging device 55 is disposed on the optical path of the first light, and configured to dodge the first light and emit the dodged first light into the first region of the light guide element 52; specifically, the light uniformizing device 55 may be a double fly-eye lens or a square bar, which may uniformize blue laser light emitted from a blue laser, the blue laser light being reflected by the first region of the light guiding element 52 and then being incident along the central axis of the collecting lens 56.

The collecting lens 56 is disposed on the light path between the light guide element 52 and the wavelength conversion device 53, the collecting lens 56 collects the blue laser light, and the blue laser light is incident on the wavelength conversion device 53 after being collected by the collecting lens 56; the wavelength conversion device 53 converts the received blue laser light at least partially into yellow fluorescence, the yellow fluorescence is collected by the collecting lens 56 and conducted to the light guide element 52, the yellow fluorescence within the area of the light guide element 52 can be emitted through the first region and the second region of the light guide element 52, and the yellow fluorescence outside the area of the light guide element 52 can be emitted without passing through the light guide element 52 and without being damaged. In a specific embodiment, the wavelength conversion device 53 emits yellow fluorescence and unconverted blue laser light, which are mixed into white light, the white light is collected by the collecting lens 56 and conducted to the light guiding element 52, the first region of the light guiding element 52 is capable of transmitting the yellow fluorescence, and the second region is capable of transmitting the yellow fluorescence and unconverted blue laser light.

Further, if the blue laser is totally reflected by the first area, the middle area is lack of blue light, so that the central area is yellow, the problem of yellow middle area can be solved through setting of the polarization state, and meanwhile, the luminous efficiency is improved; specifically, the light source 41 is configured to generate first light of a first polarization state, and the first region is configured to reflect the first light of the first polarization state and transmit the first light of a second polarization state; the wavelength conversion region 531 is configured to receive the first light of the first polarization state reflected by the first region and convert a part of the first light of the first polarization state into second light; the polarization state of the first light in the first polarization state which is not converted is scattered by the wavelength conversion region 531 and then emitted, the first light in the first polarization state and the first light in the second polarization state are changed to be emitted from the wavelength conversion device 53 together with the second light, and the first light in the second polarization state and the second light can be transmitted from the first region, so that the problem of yellowing in the middle region is reduced, and the light emitting efficiency is improved; for example, the first light of the first polarization state comprises S-polarized blue light and the first light of the second polarization state comprises P-polarized blue light.

In a specific embodiment, the light guiding element 52 may be placed at an inclination of 45 ° with respect to the optical axis of the first light emitted by the light source 51, as shown in fig. 5.

In one embodiment, as shown in fig. 6, the wavelength conversion device 53 includes a wavelength conversion region 531, and the wavelength conversion region 531 is configured to receive the incident first light and generate the second light. The second light is yellow fluorescence, the wavelength conversion region 531 is an annular region, the annular region is provided with a yellow fluorescent material, the yellow fluorescent material is excited by a part of blue laser light to generate yellow fluorescence, and unconverted blue laser light and the yellow fluorescence are mixed to form white light, that is, light emitted from the wavelength conversion region 531 includes the yellow fluorescence and unconverted blue laser light.

In this embodiment, the first light emitted from the light source 51 is homogenized by the light homogenizing device 55, and then reflected by the first region of the light guiding element 52 to enter the collecting lens 56, and then imaged on the wavelength conversion device 53 to generate yellow fluorescence, the excited yellow fluorescence and the un-excited blue laser are combined into white light, and then collected by the collecting lens 56, when reaching the light guiding element 52, the white light outside the light guiding element 52 can enter the subsequent optical system without damage to form emergent light, and within the first region, the S-polarized blue light is reflected, and the P-polarized blue light and the yellow fluorescence are transmitted.

In another embodiment, the second light includes red fluorescence and green fluorescence, as shown in fig. 7, the wavelength conversion region 531 includes a red light conversion region 5311 and a green light conversion region 5312, the red light conversion region 5311 is provided with red fluorescent material, and the green light conversion region 5312 is provided with green fluorescent material. Further, the wavelength conversion device 53 further includes a scattering region 532, the scattering region 532 is used for scattering the incident first light, and the second light emitted from the wavelength conversion region 531 and the first light emitted from the scattering region 532 may be combined into white light. The wavelength converting region 531 and the scattering region 532 may be located at different positions at the same radius of the wavelength converting device 53, such that the wavelength converting region 531 and the scattering region 532 are arranged in a ring.

In another specific embodiment, the extending direction of the light guiding element 52 is perpendicular to the incident plane formed by the first light, specifically, the first light emitted from the light source 51 is reflected to the wavelength conversion device 53 through the light guiding element 52, the optical path of the first light before being reflected by the light guiding element 52 and the optical path of the first light after being reflected by the light guiding element 52 form an incident plane, and the extending direction of the light guiding element 52 is perpendicular to the incident plane formed by the first light, so that the space occupied by the light guiding element 52 in the direction of the second light emitted from the wavelength conversion device 53 can be reduced, thereby reducing the distance between the collecting lens 56 and the subsequent optical system, effectively reducing the dilution of the etendue, and further improving the light emitting efficiency of the light source 51.

The present embodiment provides a solution to use the long and narrow light guiding element 52 as the light splitter, and by reducing the area of the second region in the light guiding element 52, the loss of white light through the light guiding element 52 is reduced, the light emitting efficiency of the light source device 50 is improved, and since a plurality of light guiding elements 52 can share one mask, the difficulty in the process can be simplified, and the production cost can be reduced.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims

1. A light directing element comprising a first region for reflecting at least a portion of a first light and transmitting a second light, and second regions on opposite sides of the first region, respectively, the second regions for transmitting the first light and the second light;

wherein a wavelength range of the first light and a wavelength range of the second light are different.

2. A light-directing element according to claim 1,

the first region is used for reflecting the first light in the first polarization state and transmitting the first light in the second polarization state.

3. A light-directing element according to claim 1,

the first region and the second region are each rectangular, and the width of the first region is the same as the width of the second region in a direction perpendicular to the extending direction of the light guiding element.

4. A light-directing element according to claim 1,

the first region comprises a first transparent substrate and an optical coating film arranged on the first transparent substrate, and the second region comprises a second transparent substrate.

5. A light source device, comprising:

a light source for generating first light;

a light directing element disposed in an optical path of the first light, the light directing element being as claimed in any one of claims 1-4, the first region being configured to reflect at least a portion of the first light;

the wavelength conversion device is used for receiving the first light reflected by the light guide element and converting at least part of the first light into second light, and the second light is transmitted and emitted through the first area and the second area;

6. The light source device according to claim 5,

the light source is used for generating first light in a first polarization state, and the first area is used for reflecting the first light in the first polarization state and transmitting the first light in a second polarization state.

7. The light source device according to claim 5,

the wavelength conversion device includes a wavelength conversion region for receiving the incident first light and generating the second light.

8. The light source device according to claim 7,

the second light is yellow fluorescence, and the wavelength conversion region is provided with a yellow fluorescent material, or

The second light comprises red fluorescence and green fluorescence, the wavelength conversion region comprises a red light conversion region and a green light conversion region, the red light conversion region is provided with a red fluorescent material, and the green light conversion region is provided with a green fluorescent material.

9. The light source device according to claim 7,

the wavelength conversion device further comprises a scattering region, the scattering region and the wavelength conversion region are arranged in an annular shape, and the scattering region is used for scattering the incident first light.

10. The light source device according to claim 5,

the extending direction of the light guiding element is perpendicular to the incident plane formed by the first light.

11. The light source device according to claim 5,

the light source device further comprises a light homogenizing device, wherein the light homogenizing device is arranged on a light path of the first light and is used for homogenizing the first light and enabling the homogenized first light to enter the light guide element.