CN114153118B

CN114153118B - Mixed light source system and projection equipment

Info

Publication number: CN114153118B
Application number: CN202010924744.8A
Authority: CN
Inventors: 陈怡学; 尹蕾
Original assignee: Chengdu Jimi Technology Co Ltd
Current assignee: Jimi Technology Co ltd
Priority date: 2020-09-05
Filing date: 2020-09-05
Publication date: 2023-01-24
Anticipated expiration: 2040-09-05
Also published as: CN114153118A; WO2022048324A1

Abstract

The invention relates to the technical field of display, and discloses a mixed light source system and a projection device, wherein the mixed light source system comprises: the light combining element comprises a transparent substrate, and a light splitting and filtering film is formed on the transparent substrate; the converter comprises a substrate, wherein a reflecting layer and a conversion layer are formed on the substrate, the reflecting layer is used for reflecting the light processed by the conversion layer and guiding the light to the light combining element, and the conversion layer comprises a wavelength conversion area and a polarization conversion area. The mixed light source system provided by the invention utilizes the polarization characteristic of light and the special film layer of the light combination element to realize the light combination of a plurality of light colors; and the whole light path has simple structure, compact volume and high practical value.

Description

Mixed light source system and projection equipment

Technical Field

The invention relates to the technical field of display, in particular to a hybrid light source system and projection equipment.

Background

In projection display products, projection display light sources are very important components, whose function is to convert light rays of different colors, different angular distributions, different brightnesses and different shapes into uniform light spots that illuminate the active area of the display chip.

In the field of projection display, the conventional bulb is not adopted due to its own defects, and new light sources such as LED, laser phosphor, and three-color laser exhibit excellent characteristics in terms of brightness, color, life, energy consumption, etc., and are becoming the mainstream of light sources for projection display. Among the three novel light source technologies, the LED light source is difficult to realize high brightness, and the three laser light sources have speckle puzzles and cannot obtain ideal image quality.

Disclosure of Invention

In view of this, the present invention provides a hybrid light source system architecture, which may be used for projection display, and utilizes the polarization characteristic of laser light, and has a simple optical path and a compact structure, and not only can utilize the brightness advantage of laser light, but also can greatly reduce the speckle effect of pure laser light.

In a first aspect, the present invention provides a hybrid light source system, comprising:

the light combining element comprises a transparent substrate, wherein a light splitting filter film is formed on the transparent substrate and is used for reflecting or transmitting first polarized light with a first wavelength incident to the light combining element, transmitting or reflecting second polarized light with the first wavelength incident to the light combining element and transmitting or reflecting light with wavelengths except the first wavelength;

the converter comprises a substrate, a reflecting layer and a conversion layer are formed on the substrate, the reflecting layer is used for reflecting light processed by the conversion layer and guiding the light to the light combining element, the conversion layer comprises a wavelength conversion area and a polarization conversion area, the wavelength conversion area is used for carrying out wavelength conversion on first polarized light of a first wavelength transmitted or reflected to the converter by the light combining element, and the polarization conversion area is used for converting the polarization direction of the first polarized light of the first wavelength transmitted or reflected to the converter by the light combining element and converting the first polarization state into a second polarization state.

In a possible implementation manner, the light splitting filter film includes a polarization light splitting film and a filter film, where the polarization light splitting film is configured to reflect or transmit a first polarized light with a first wavelength incident to the light combining element, and transmit or reflect a second polarized light with the first wavelength incident to the light combining element, and transmit a light with a wavelength other than the first wavelength; the filter film is used for transmitting light with a first wavelength and transmitting or reflecting the light converted by the wavelength conversion region of the converter so as to combine the light.

The polarization light splitting film and the light filter film can be arranged on the same surface of the transparent substrate, and can also be respectively arranged on two surfaces of the transparent substrate. When the polarization splitting film and the filter film are provided on the same face of the transparent substrate, the two layers may be combined into one layer.

In a possible implementation manner, the filter film is further configured to reflect or transmit the light of the second wavelength incident to the light combining element to combine the light. The light with the second wavelength is introduced to be combined with the light with the first wavelength and the light converted by the wavelength conversion area of the converter so as to synthesize the required light color.

In one possible implementation, the wavelength conversion region includes a first wavelength conversion region for converting light of the first wavelength into light of a third wavelength and a second wavelength conversion region for converting light of the first wavelength into light of a fourth wavelength. The first wavelength conversion region and the second wavelength conversion region of the wavelength conversion region convert the light with the first wavelength into light with two different wavelengths, and then the light with the first wavelength is synthesized into required light color.

In one possible implementation, the wavelength conversion region is configured to convert light of a first wavelength to light of a fifth wavelength.

In one possible implementation, the light of the first wavelength is blue light.

In one possible implementation, the light of the second wavelength is red or green light.

In one possible implementation, the light of the third wavelength and the light of the fourth wavelength have different light colors and are selected among red light and green light.

In one possible implementation, the light of the fifth wavelength is red, green or yellow.

In a possible implementation manner, a wavelength conversion material is disposed in the wavelength conversion region, and a quarter-wave plate or an optical rotation plate is disposed in the polarization conversion region.

In one possible implementation, the first polarized light of the first wavelength is polarized light having linear polarization or approximately linear polarization.

In one possible implementation, the converter further includes: a driving means for driving the converter to rotate at a predetermined cycle; a connection line electrically connecting the driving device to an external power source.

In one possible implementation manner, the method further includes: and the first polarized light with the first wavelength is processed by the diffusion sheet and then enters the light combining element.

In one possible implementation manner, the method further includes: and the lens system is arranged between the light combining element and the converter and is used for collimating and/or converging and shaping incident light and emergent light of the converter.

In one possible implementation manner, the method further includes: and the light with the second wavelength enters the light combining element after being collimated and shaped by the second lens system.

In a second aspect, the present invention provides a projection apparatus comprising: the first light source is used for generating first polarized light with a first wavelength as incident light of a light combining element in the mixed light source system; a hybrid light source system according to any one of the first aspect and possible implementations of the first aspect.

In one possible implementation manner, the method further includes: and the second light source is used for generating light with a second wavelength, and the light with the second wavelength is reflected or transmitted by the light combining element in the mixed light source system to combine light.

In one possible implementation, the first light source is a laser light source, and is configured to generate linearly polarized or approximately linearly polarized first polarized light of the first wavelength.

The mixed light source system provided by the invention, such as a laser-fluorescence mixed light source system, realizes the light combination of a plurality of light colors by utilizing the polarization characteristic of laser and a special film layer of a light combination element; and the whole light path has simple structure, compact volume and high practical value.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail embodiments of the present invention with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings, like reference numbers generally represent like parts or steps. Wherein:

fig. 1A and 1B are schematic structural diagrams of a hybrid light source system according to an embodiment of the invention;

FIG. 2 is a front view of a converter in an embodiment of the invention;

FIG. 3 is a schematic structural diagram of another state of a hybrid light source system according to an embodiment of the present invention;

fig. 4 is a front view of a converter in another embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a hybrid light source system according to another embodiment of the present invention;

fig. 6 is a schematic structural diagram of a hybrid light source system according to another embodiment of the present invention.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. 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 invention. Moreover, while the present disclosure has been described in terms of one or more exemplary embodiments, it is to be understood that each aspect of the disclosure can be implemented as a separate entity, whether or not such embodiment is described in connection with its specific embodiments. The embodiments and features of the embodiments described below can be combined with each other without conflict.

In the embodiments of the present invention, words such as "exemplary", "for example", etc. are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the word using examples is intended to present concepts in a concrete fashion.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The term "and/or" includes any and all combinations of one or more of the associated listed items.

In order to thoroughly understand the present invention, a detailed description will be provided below in order to explain the technical solution of the present invention. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.

Fig. 1A and fig. 1B are schematic structural diagrams of a hybrid light source system according to an embodiment of the invention. As shown in fig. 1A and 1B, the hybrid light source system includes: the light combining element 1 comprises a transparent substrate 11, a light splitting filter film 12 is formed on the transparent substrate 11, and the light splitting filter film 12 can be arranged on a light beam incident surface of the transparent substrate 11 or a light beam emergent surface of the transparent substrate 11. The spectral filter 12 is configured to perform polarization splitting on the polarized light with the first wavelength incident to the light combining element 1, reflect/transmit the first polarization state and transmit/reflect the second polarization state, and transmit/reflect light with a wavelength other than the first wavelength; the converter 2 includes a substrate 21, a reflective layer 22 and a conversion layer 23 are formed on the substrate 21, the conversion layer 23 includes a wavelength conversion region 231 and a polarization conversion region 232, as shown in fig. 2, the wavelength conversion region 231 is configured to perform wavelength conversion on the polarized light of the first wavelength transmitted or reflected to the converter 2 through the light combining element 1, and the polarization conversion region 232 is configured to convert the polarization direction of the polarized light of the first wavelength transmitted or reflected to the converter 2 through the light combining element 1, convert the first polarization state into the second polarization state, or convert the second polarization state into the first polarization state.

In some embodiments, the dichroic filter 12 includes a polarization splitting film 121 and a filter film 122, as shown in fig. 5 and 6. The polarization splitting film 121 is configured to perform polarization splitting on the polarized light of the first wavelength incident to the light combining element 1, reflect/transmit the first polarization state and transmit/reflect the second polarization state, and transmit light of wavelengths other than the first wavelength; the filter 122 is used for transmitting the light with the first wavelength and transmitting or reflecting the light converted by the wavelength converting region 231 of the converter 2 for combining, and if the filter 122 is used for transmitting the light converted by the wavelength converting region 231 of the converter 2 for combining, the filter 122 can be omitted, i.e. the dichroic filter 12 only includes the polarization splitting film 121. The filter 122 can also be used to reflect or transmit the light of the second wavelength incident to the light combining element for light combining.

The polarization splitting film 121 and the filter film 122 may be provided on the same surface of the transparent substrate 11, or may be provided on two opposite surfaces of the transparent substrate 11. When the polarization splitting film 121 and the filter film 122 are disposed on the same surface of the transparent substrate 11, they may be a polarization splitting film and a filter film having their respective functions, or a polarization filter film having the functions of both the polarization splitting film and the filter film, that is, a polarization splitting film may be plated on one surface of the transparent substrate 11 first, and then a filter film is plated on the other surface, or a filter film is plated on the other surface, and the order of the two is not limited, or a polarization filter film capable of realizing the functions of both the polarization splitting film 121 and the filter film 122 may be directly plated on one surface of the transparent substrate 11; when the polarization splitting film 121 and the filter film 122 are disposed on two surfaces of the transparent substrate 11, the polarization splitting film 121 may be disposed on the light beam incident surface of the transparent substrate 11, the filter film 122 may be disposed on the light beam emergent surface of the transparent substrate 11, or the polarization splitting film 121 may be disposed on the light beam emergent surface of the transparent substrate 11, and the filter film 122 is disposed on the light beam incident surface of the transparent substrate 11.

The polarization splitting film 121 is a wavelength-specific polarization splitting film that only polarizes and splits polarized light of a first wavelength, and transmits light of the first wavelength in the P-polarization state and reflects light of the first wavelength in the S-polarization state, and transmits light of wavelengths other than the first wavelength in both the P-polarization state and the S-polarization state. The polarization conversion region 232 in the conversion layer 23 can convert linearly polarized light into circularly polarized light, and simultaneously can convert circularly polarized light into linearly polarized light, for example, light with the first wavelength in the S-polarized state passes through the polarization conversion region 232 twice to change into the P-polarized state, and can transmit through the light combining element 1, for example, a quarter wave plate, a rotation plate or a material with the same function is arranged in the polarization conversion region 232, and the quarter wave plate or the rotation plate is fixed on the substrate 21.

Exemplarily, it is assumed that light of a first wavelength is incident to the light combining element 1 in a first polarization state, the first polarization state is an S polarization state, and the second polarization state is a P polarization state. The light with the first wavelength is reflected by the light combining element 1 and then enters the converter 2, and when the light with the first wavelength enters the polarization conversion region 232, the light is reflected by the reflective layer 22 below the polarization conversion region 232 and passes through the polarization conversion region 232 twice, and the polarization state of the light is converted from the first polarization state to the second polarization state. The light of the first wavelength in the second polarization state can be transmitted through the light combining element 1. When light of the first wavelength is incident on the wavelength converting region 231, light of a fifth wavelength is generated, as shown in fig. 3. The light of the fifth wavelength is reflected by the reflective layer 22 and then transmitted through the light combining element 1. Finally, the light of the first wavelength and the light of the fifth wavelength transmitted through the light combining element 1 are combined to form the desired light color. If the light with the first wavelength is blue light and the wavelength conversion region 231 is provided with a yellow light conversion material, the light with the fifth wavelength is yellow light, and the yellow light and the blue light are combined into white light.

In some embodiments, the base 21 of the converter 2 may be a circular substrate, and the wavelength conversion region 231 and the polarization conversion region 232 are disposed in a circumferential direction of the circular substrate, on which a fan-shaped, a semi-annular, or the like is formed, as shown in fig. 2 and 4. The converter 2 may further comprise a driving means 24 for driving the converter to rotate according to a predetermined period and a connection line (not shown in the figure) electrically connecting the driving means 24 to an external power source.

The base 21 may be transparent or opaque, and for example, a metal base material made of copper, aluminum, or the like is processed by silver vapor deposition or the like to form the wavelength conversion region 231 in the reflection layer 22 and the conversion layer 23 on the surface of the base 21. The polarization conversion region 232 is formed by disposing any material or element capable of changing the polarization direction on the substrate 21, such as a 1/4 wave plate, and the 1/4 wave plate is fixed on the substrate 21 by means of pasting or the like. If the substrate 21 is transparent, the reflective layer 22 and the conversion layer 23 may be located on the same side of the substrate 21, or may be located on both sides of the substrate 21, respectively, and the incident light from the converter 2 is processed by the conversion layer 23 and then reflected by the reflective layer 22. If the substrate 21 is opaque, the reflective layer 22 and the conversion layer 23 are located at the light beam incident surface of the substrate 21, and the reflective layer 22 is located between the conversion layer 23 and the substrate 21.

In some embodiments, as shown in fig. 4, the wavelength conversion region 231 includes a first wavelength conversion region 2311 for converting light of the first wavelength to light of the third wavelength and a second wavelength conversion region 2312 for converting light of the first wavelength to light of the fourth wavelength. In this embodiment, the light of the first wavelength, the light of the third wavelength, and the light of the fourth wavelength combine to form the desired light color. Illustratively, if the light of the first wavelength is blue light, and a green conversion material and a red conversion material are respectively disposed in the first wavelength conversion region 2311 and the second wavelength conversion region 2312, the blue light, the red light and the green light are finally combined into white light.

Fig. 5 is a schematic structural diagram of a hybrid light source system according to another embodiment of the invention. As shown in fig. 5, the hybrid light source system includes a light combining element 1 and a converter 2. Different from the embodiment shown in fig. 1, the light splitting filter 12 on the transparent substrate 11 of the light combining element 1 includes a polarization light splitting film 121 and a filter film 122, the polarization light splitting film 121 and the filter film 122 are respectively disposed on two opposite surfaces of the transparent substrate 11, and the filter film 122 is used for transmitting the light with the first wavelength and transmitting the light converted by the wavelength conversion region of the converter to combine the light. If the light with the first wavelength transmitted through the filter 122 and the light converted by the wavelength converting region 231 of the converter 2 cannot be combined into the desired light color, the light with the second wavelength can be introduced, and the light with the second wavelength is reflected by the filter 122 of the light combining element 1 to be combined with the light with the first wavelength and the light converted by the wavelength converting region 231 of the converter 2 into the light with the desired color.

Exemplarily, assuming that the light of the desired color is white light, the light of the first wavelength is blue light, the wavelength conversion material disposed in the wavelength conversion region 231 is a green light conversion material, such as green phosphor, and the light of the fifth wavelength is green light, the green light and the blue light transmitted through the light combining element 1 cannot be combined into white light, red light may be introduced, and the red light is reflected by the filter film 122 of the light combining element 1 to be combined with the green light and the blue light, and may be combined into white light. If the wavelength conversion material disposed in the wavelength conversion region 231 is a red light conversion material, such as red phosphor, and the light with the fifth wavelength is red light, the introduced light may be green light, and the green light is reflected by the filter film 122 of the light combining element 1 to be combined with the red light and the blue light, so as to synthesize white light.

Other parts in this embodiment are similar to those in the embodiment shown in fig. 1, and are not described herein again.

Fig. 6 is a schematic structural diagram of a hybrid light source system according to still another embodiment of the invention. As shown in fig. 6, the hybrid light source system includes: light combining element 1, converter 2, diffusion sheet 3, lens system 4 and lens system 5. The first light source 01 generates polarized light of the first wavelength as incident light of the light combining element 1, and preferably, the first light source 01 is a laser light source for generating polarized light of the first wavelength which is linearly polarized or approximately linearly polarized. The second light source 02 generates light with a second wavelength, and the light with the second wavelength is reflected or transmitted by the filter film 122 of the light combining element 1 to be combined. The diffusion sheet 3 is positioned between the first light source 01 and the light combining element 1, and the laser generated by the first light source 01 is homogenized through the diffusion sheet 3, so that the damage of high power density to the fluorescent powder layer is avoided. The lens system 4 is disposed between the light combining element 1 and the converter 2, and is used for collimating and/or converging and shaping incident light and emergent light of the converter 2. The lens system 5 is disposed between the second light source 02 and the light combining element 1, and is used for collimating and shaping the light with the second wavelength.

Other parts in this embodiment are similar to those in the embodiment shown in fig. 5, and are not described again here.

An embodiment of the present invention further provides a projection device, including the hybrid light source system according to the above embodiment, and the projection device further includes other components, such as a projection lens, and the arrangement of these components may refer to related technologies, which are not described herein again.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. The character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A hybrid light source system includes a first light source, a second light source, a light combining element, and a converter,

a first light source for generating light of a first wavelength;

a second light source for generating light of a second wavelength;

a light combining element disposed on a light path of the light with the first wavelength and the light with the second wavelength, wherein the light combining element includes a transparent substrate, and a polarization splitting film and a filter film are formed on the transparent substrate, and the polarization splitting film is configured to reflect or transmit a first polarized light with the first wavelength incident on the light combining element, transmit or reflect a second polarized light with the first wavelength incident on the light combining element, and transmit light with a wavelength other than the first wavelength; the filter film is used for transmitting light with a first wavelength, transmitting or reflecting light converted by the wavelength conversion region of the converter, and reflecting or transmitting light with a second wavelength incident to the light combination element to combine light;

2. A hybrid light source system according to claim 1, wherein the wavelength converting region includes a first wavelength converting region for converting light of the first wavelength into light of a third wavelength and a second wavelength converting region for converting light of the first wavelength into light of a fourth wavelength.

3. A hybrid light source system as recited in claim 1, wherein the wavelength conversion region is configured to convert light of a first wavelength to light of a fifth wavelength.

4. A hybrid light source system according to any of claims 1-3, wherein the light of the first wavelength is blue light.

5. The system of claim 1, wherein the light of the second wavelength is red or green.

6. A hybrid light source system as claimed in claim 2, wherein the light of the third wavelength and the light of the fourth wavelength are different in color and are selected from red light and green light.

7. A hybrid light source system according to claim 3, wherein the light of the fifth wavelength is red, green or yellow.

8. A hybrid light source system as recited in claim 1, wherein a wavelength conversion material is disposed in the wavelength conversion region, and a quarter-wave plate or an optical rotation plate is disposed in the polarization conversion region.

9. The hybrid light source system of claim 1, wherein the first polarized light of the first wavelength is polarized light having linear polarization or approximately linear polarization.

10. A hybrid light source system as recited in claim 1, wherein said converter further comprises:

a driving means for driving the converter to rotate at a predetermined cycle;

a connection line electrically connecting the driving device to an external power source.

11. The hybrid light source system of claim 1, further comprising:

and the first polarized light with the first wavelength is processed by the diffusion sheet and then enters the light combining element.

12. The hybrid light source system of claim 1, further comprising:

and the lens system is arranged between the light combining element and the converter and is used for collimating and/or converging and shaping incident light and emergent light of the converter.

13. The hybrid light source system of claim 1, further comprising:

and the light with the second wavelength enters the light combining element after being collimated and shaped by the second lens system.

14. A projection device comprising the hybrid light source system of any one of claims 1-13.

15. A projection device according to claim 14, wherein said first light source is a laser light source for generating linearly polarized or approximately linearly polarized light of said first wavelength in a first polarization state.