CN212112106U - A light guide element and light source device - Google Patents

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

A light guide element and light source device

technical field

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

Background technique

The existing laser fluorescent white light source can be used as a light source in projection display, and can also be used for stage lights or spotlights. The laser fluorescent white light source includes an area diaphragm, and the area diaphragm includes a coating area in the center and a second area in the periphery. , the synthesized white light will have a loss of at least 2.5% when passing through the second area. Due to the larger area of the second area, more light is lost, resulting in a decrease in luminous efficiency; In the central area, when coating, a separate mask needs to be used for each diaphragm. The area that does not need coating is much larger than the area that needs coating, which greatly reduces production efficiency and leads to waste in cost.

Utility model content

The present 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 above technical problems, the technical solution adopted in the present application is to provide a light guide element, the light guide element includes: a first area and a second area respectively located on opposite sides of the first area, and the first area is used for reflection At least a portion of the first light and the second light are transmitted, and the second region is used for transmitting the first light and the second light, wherein the wavelength range of the first light and the wavelength range of the second light are different.

In order to solve the above technical problem, another technical solution adopted in the present application is to provide a light source device, the light source device includes: a light source, a light guide element and a wavelength conversion device, the light source is used to generate the first light; the light guide element is arranged on the The optical path of the first light includes a first area and second areas respectively located on opposite sides of the first area, the first area is used to reflect at least part of the first light and transmit the second light, and the second area is used to transmit the first light. a light and a second light; the wavelength conversion device is used for receiving the first light reflected by the light guiding element, and converting at least part of the first light into second light, and the second light is transmitted through the first region and the second region, wherein , the wavelength range of the first light and the wavelength range of the second light are different.

Through the above solution, the beneficial effect of the present application is: since the second regions for transmitting light are only provided on opposite sides of the first region, the area of the second region can be reduced, so that the emitted light can pass through the second region. Reduce the amount of light and reduce light loss; when processing light guide elements, multiple light guide elements can share a mask, and multiple light guide elements can be obtained by cutting, which can simplify the processing process, significantly improve production efficiency, and reduce production costs. And the luminous efficiency of the light source device is improved.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort. in:

1 is a schematic structural diagram of an embodiment of a light guide element provided by the present application;

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

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

4 is a schematic structural diagram of an embodiment of a light source device provided by the present application;

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

Fig. 6 is the first structural schematic diagram of the 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 ways

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. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts 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 perpendicular to the incident surface (S component) and a component parallel to the incident surface (P component), the reflectivity of natural light (the sum of S light and P light) It increases with the increase of the incident angle, and conversely, the transmittance of natural light decreases with the increase of the incident angle.

Since the white light has to pass through the area film after it is emitted, it can be used by the subsequent optical system. Now the light source designs using the area film are all coated on a glass plate. When the outer periphery of the area film is a light-transmitting surface, the After the AR (Anti-Reflection, anti-reflection) film is coated, it can only have a transmittance of 97.5%, and the regional coating takes a lot of man-hours in the process and the cost is high.

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of an embodiment of a light guide element provided by the present application. The light guide element 10 includes a first area 11 and second areas 12 respectively located on opposite sides of the first area 11 . In this embodiment, the first area 11 and the second area 12 are both rectangular, the first area 11 has opposite upper and lower sides, one of the second areas 12 is located on the upper side of the first area 11, and the other is located on the upper side of the first area 11. The second area 12 is located on the lower side of the first area 11 , that is, the first area 11 is located in the middle area of the light guide element 10 , at this time, the light guide element 10 extends in the up-down direction. Of course, the two second regions 12 may also be located on the opposite left and right sides of the first region 11, respectively. In this case, the light guide element 10 extends in the left and right directions. Preferably, the width of the first region 11 is the same as the width of the second region 12 in the direction perpendicular to the extension direction of the light guide element 10 . In this way, the light guide element 10 forms a complete rectangle, so that the light guide element 10 is processed during processing. Easy to cut and separate.

It can be understood that, based on specific application requirements, the width of the second region 12 may also be different from the width of the first region 11 , and the width between the two second regions 12 may also be different. The shapes of the first area 11 and the second area 12 are not limited to rectangles, and may also be other polygons such as circles, triangles, trapezoids, and hexagons. The first region 11 and the second region 12 may have different shapes, respectively.

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

The second region 12 is an uncoated region, which can be a glass sheet, and can transmit light of all wavelengths, specifically, it can transmit the first light and the second light.

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

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

When processing the light guide elements 10, as shown in FIG. 3, a plurality of light guide elements 10 can share a mask, and after the coating is completed, a plurality of light guide elements 10 can be obtained by cutting, which can significantly improve production efficiency and reduce costs .

Please refer to FIG. 4 . FIG. 4 is a schematic structural diagram of an embodiment of a light source device provided by the present application. The light source device 40 includes a light source 41 , a light guide 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 light path of the first light, and includes a first area 421 and a second area 422 respectively located on opposite sides of the first area 421, which are used for reflecting at least part of the first light and transmitting the second light, The wavelength range of the first light and the wavelength range of the second light are different; the second region 422 can allow beams of all wavelengths to pass through, 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 embodiments.

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

The wavelength conversion device 43 is disposed on the optical path of the first light, and is used for receiving the first light reflected by the light guiding element 42 and converting at least part of the first light into second light, and the second light passes through the first region 421 and the second light. The second area 422 transmits and exits; specifically, the first light is reflected by the light guide element 42 to the wavelength conversion device 43, the wavelength conversion device 43 can be a fluorescent pink wheel, the wavelength conversion device 43 is provided with a fluorescent conversion material, and the second light can be Fluorescence, eg, yellow fluorescence.

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 guiding 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 to generate the corresponding second light, the second light can pass through the first area 421 and the second area 422, and the part of the fluorescent material is not excited. One light can be combined with fluorescent light to synthesize white light. Since the area of the second region 422 is reduced, the portion of the white light passing through the second region 422 is reduced, and the white light outside the area of the light guide element 42 can be emitted without damage, thereby improving the luminous efficiency of the light source device 40 .

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of another embodiment of the light source device provided by the present application. The light source device 50 includes: a light source 51, a light guide element 52, a wavelength conversion device 53, a positive and negative lens 54, a light homogenizing device 55, and Collection lens 56 .

The light source 51 can be a blue laser, and the blue laser emitted by the blue laser passes through the positive and negative lenses 54, and the positive and negative lenses 54 are arranged on the optical path of the second light, which is used for compressing the second light and emitting the compressed second light. into the uniform light device 55 .

The homogenizing device 55 is arranged on the optical path of the first light, and is used for homogenizing the first light, and injecting the homogenized first light into the first area of the light guiding element 52; specifically, the homogenizing device 55 can be a double fly-eye lens or a square rod, which can homogenize the blue laser light emitted by the blue laser.

The collection lens 56 is arranged on the optical path between the light guide element 52 and the wavelength conversion device 53, and the collection lens 56 converges the blue laser light, and the blue laser light is collected by the collection lens 56 and then incident on the wavelength conversion device 53; The blue laser light is at least partially converted into yellow fluorescence, which is collected by the collection lens 56 and conducted to the light guiding element 52 . The yellow fluorescence within the area of the light guiding element 52 can pass through the first and second regions of the light guiding element 52 . For exit, the yellow fluorescent light outside the area of the light guide element 52 does not need to pass through the light guide element 52 and can be exited without damage. In a specific embodiment, the wavelength conversion device 53 emits yellow fluorescent light and unconverted blue laser light, and the two are mixed into white light, and the white light is collected by the collecting lens 56 and transmitted to the light guiding element 52. One region is capable of transmitting yellow fluorescence, and a second region is capable of transmitting yellow fluorescence and unconverted blue laser light.

Further, if the blue laser light is all reflected by the first region, the middle region will lack blue light, making the central region yellow, so the problem of yellowing in the middle region can be solved by setting the polarization state, and the luminous efficiency can be improved at the same time; , the light source 41 is used to generate the first light of the first polarization state, the first area is used to reflect the first light of the first polarization state, and transmit the first light of the second polarization state; the wavelength conversion area 531 is used to receive the first light of the first polarization state. The first light of the first polarization state is reflected by a region, and part of the first light of the first polarization state is converted into the second light; the polarization state of the first light of the first polarization state that is not converted is converted by the wavelength conversion region 531 After scattering, it is emitted, and becomes the first light of the first polarization state and the first light of the second polarization state, and is emitted from the wavelength conversion device 53 together with the second light, and the first light of the second polarization state can be combined with the second light from The first region transmits, thereby reducing the problem of yellowing in the middle region and improving luminous efficiency; for example, the first light of the first polarization state includes S-polarized blue light, and the first light of the second polarization state includes P-polarized blue light.

In a specific embodiment, the light guide element 52 can be placed at an inclination of 45° with respect to the optical axis of the first light emitted from 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 for receiving the incident first light and generating the second light. The second light is yellow fluorescence, the wavelength conversion region 531 is an annular region, and the annular region is provided with a yellow fluorescent material. After the yellow fluorescent material is excited by part of the blue laser, yellow fluorescence is generated, and the unconverted blue laser and yellow fluorescence Mixed into white light, that is, the light emitted from the wavelength conversion region 531 includes yellow fluorescent light and unconverted blue laser light.

In this embodiment, the first light emitted from the light source 51 is homogenized by the homogenizing device 55, and then reflected by the first region of the light guiding element 52 into the collecting lens 56, and then imaged on the wavelength conversion device 53 to generate yellow fluorescence. The fluorescent light and the unexcited blue laser light are synthesized into white light, which is then collected by the collection lens 56. When reaching the light guide element 52, the white light outside the light guide element 52 can enter the subsequent optical system without damage to form outgoing light. Within the area, the S-polarized blue light is reflected, and the P-polarized blue light and yellow fluorescent light are transmitted. Compared with the light source solution in the prior art, the narrow and long light guide element 52 reduces the loss of the light source and improves the luminous efficiency of the light source 51. Reduced costs.

In another embodiment, the second light includes red fluorescent light and green fluorescent light. As shown in FIG. 7 , the wavelength conversion region 531 includes a red light conversion region 5311 and a green light conversion region 5312 , and the red light conversion region 5311 is provided with a red fluorescent material. , the green light conversion region 5312 is provided with a green fluorescent material. Further, the wavelength conversion device 53 further includes a scattering region 532 for scattering the incident first light, and the second light emitted from the wavelength conversion region 531 can be combined with the first light emitted from the scattering region 532 to synthesize white light. The wavelength conversion area 531 and the scattering area 532 may be located at different positions of the same radius of the wavelength conversion device 53 , so that the wavelength conversion area 531 and the scattering area 532 are arranged in a ring shape.

In another specific embodiment, the extending direction of the light guide 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 by the light guide element 52, The optical path of the first light before being reflected by the 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 arrangement is such that the extending direction of the light guiding element 52 is perpendicular to the incident plane formed by the first light. The space occupied by the light guide element 52 in the direction of the second light emitted by the wavelength conversion device 53 is reduced, thereby reducing the distance between the collection lens 56 and the subsequent optical system, effectively reducing etendue dilution, and further improving the light source 51 luminous efficiency.

This embodiment provides a solution of using a narrow and long light guide element 52 as a beam splitter. By reducing the area of the second region in the light guide element 52, the loss of white light passing through the light guide element 52 is reduced, and the The luminous efficiency of the light source device 50 and the fact that a plurality of light guide elements 52 can share one mask can simplify the difficulty of the process and reduce the production cost.

The above are only the embodiments of the present application, and are not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied in other related technical fields, All the same are included in the scope of patent protection of the present application.

Claims (11)

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;

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

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.

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