WO2021008330A1 - Light source system and display device - Google Patents

Abstract

Provided are a light source system (100, 200, 300) and a display device, the light source system (100, 200, 300) comprising: a first light source assembly (101c), used for emitting a first laser light comprising blue laser light; a shaping component (112, 212), used for expanding the divergence angle of the first laser light to obtain shaped light; a second light source assembly (101b), used for emitting a second light; a first guiding element (114, 314, 414), used for guiding the shaped light and the second light to travel along the same path and obtain synthesized light; and a polarizing assembly (1112), used for converting the synthesized light into illumination light having the same state of polarization. In the light source system (100, 200, 300), the first laser light emitted by the first light source assembly (101c) comprises blue laser light; after the blue laser light passes through the enlarged divergence angle of the shaping element (112, 212), the light spot of the blue laser light incident on the polarizing component (1112) becomes larger and uniform, prolonging the service life of the polarizing component (1112) and improving the reliability of the light source system (100, 200, 300).

Description

Light source system and display equipment Technical field

The present invention relates to the field of projection technology, in particular to a light source system and a display device.

Background technique

This section is intended to provide background or context for the specific embodiments of the invention stated in the claims. The description here is not recognized as prior art just because it is included in this section.

Projection display systems can be divided into liquid crystal display (LCD, Liquid Crystal Display) projection technology, Digital Light Processor (DLP, Digital Light Processor) projection technology and Liquid Crystal on Silicon (Liquid Crystal on Silicon, LCoS) according to different spatial light modulator types. ) Projection display system. Among them, the LCD projection display system and the LCOS projection display system are limited by the modulation principle of the spatial light modulator. The illumination light incident on the spatial light modulator must be polarized light. Therefore, the light source and the optical machine must be equipped with polarizing devices.

Please refer to FIG. 1, considering the polarization conversion efficiency and the manufacturing process level, currently the polarizing component 1112 is usually used in conjunction with the double compound eye 1111. The double compound eye 1111 includes a first compound eye 1111a and a second compound eye 1111b. The first compound eye 1111a and the second compound eye 1111b each include a plurality of lens units t for light shaping. The second compound eye 1111b is located in the first compound eye 1111a. At the focal plane of t, that is to say, the light beam incident to the first compound eye 1111a is divided by the multiple lens units of the first compound eye 1111a and focused on the lens unit t of the second compound eye 1111b, and then the second compound eye 1111b emits the array beam to the top The polarizing component 1112, the polarizing component 1112 converts the incident light into polarized light of the same polarization state. The smaller the incident beam angle of the double compound eye 1111 is, the smaller the lens unit t of the second compound eye 1111b and the incident light spot on the polarizing component 1112. The smaller the beam diameter, the higher the optical power density at the spot position.

For the laser fluorescent light source projection system based on the three-color laser fluorescent projection technology, the laser used for illumination does not pass through the color wheel, and the light efficiency and optical extension are maintained at a high rate. Therefore, when the illuminating light emitted by the light source is polarized by the polarizing component 1112, the fluorescence optical expansion therein is large, and the light spot incident on the second compound eye 1111b will cover the entire lens unit t; and the laser optical expansion in the illumination light is small, The size of each light spot in the array light spots incident on the second compound eye 1111b and the polarizing component 1112 is very small, and the light power density of each light spot is high.

The polarizing component 1112 can be a PCS (Polarization conversion system, polarization beam splitting device). Its structure is shown in Figure 1. It is made by gluing a number of prisms 1112a and half-wave plates 1112b. The glued material is organic material and is not resistant to high temperatures. Too high regional optical power density will accelerate the aging of the polarizing component 1112 and cause reliability problems. In addition, when the short-wavelength blue laser is incident on the glued material, it will also cause photo-aging problems. The uneven distribution of the blue laser incident on the polarizing component 1112 will cause a part of the polarizing component 1112 to be aging failure first, shortening the service life of the polarizing component 1112. .

Summary of the invention

The first aspect of the present invention provides a light source system, including:

A light source system includes:

The first light source assembly is used to emit the first laser light including blue laser light;

The shaping element is used to expand the divergence angle of the first laser and obtain shaping light;

The second light source assembly is used to emit second light;

The first guiding element is used to guide the shaped light and the second light to travel along the same path to obtain a synthesized light; and

The polarizing component is used to convert the synthesized light into illumination light of the same polarization state.

The second aspect of the present invention provides a display device including the light source system as described above.

In the light source system provided by the present invention, the first laser light emitted by the first light source assembly includes blue laser light. After the blue laser light passes through the shaping element to expand the divergence angle, the light spot of the blue laser light incident on the polarizing assembly becomes larger. , The blue laser light incident on the polarizing component is evenly distributed, so that the light power density per unit area of the blue laser distributed on the polarizing component is reduced, thereby prolonging the service life of the polarizing component and improving the light source system reliability.

Description of the drawings

In order to explain the technical solutions of the embodiments/modes of the present invention more clearly, the following will briefly introduce the drawings needed in the description of the embodiments/modes. Obviously, the drawings in the following description are some embodiments of the present invention. /Method, for those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings.

Fig. 1 is a schematic diagram of the structure of a conventional polarizing assembly.

2 is a schematic diagram of the structure of the light source system provided by the first embodiment of the present invention.

FIG. 3A is a schematic top view of the structure of the light combining element shown in FIG. 2.

FIG. 3B is a schematic side view of the structure of the light combining element shown in FIG. 2.

4 is a schematic diagram of the mechanism of the light source system provided by the second embodiment of the present invention.

5 is a schematic diagram of the mechanism of the light source system provided by the third embodiment of the present invention.

FIG. 6A is a schematic top view of the structure of the scattering element shown in FIG. 5.

FIG. 6B is a schematic side view of the structure of the scattering element shown in FIG. 5.

FIG. 7 is a schematic diagram of the mechanism of the light source system provided by the fourth embodiment of the present invention.

FIG. 8A is a schematic bottom view of the structure of the scattering element shown in FIG. 7.

FIG. 8B is a schematic top view of the structure of the scattering element shown in FIG. 7.

Symbol description of main components

Double compound eyes	1111
Polarizing components	1112
First compound eye	1111a
Second compound eye	1111b
Lens unit	t
Light source system	100, 200, 300
First light source assembly	101c
Shaping components	112, 212
Second light source assembly	101b
First guiding element	114, 314, 414
Spectroscopic film	314a
Anti-reflection coating	314b
Scattering element	115
lens	113, 117, 102, 104

Third light source assembly	120, 320
Combining light element	109
Coating area	109a
Marginal area	109b
Excitation light source	101a
Wavelength conversion element	107
Substrate	107a, 414a
Drive unit	107b, 414b
Second guiding element	105
Homogenizing element	103
Collecting lens	106
Relay lens	108, 106a, 106b, 110
Light entrance	414c
Glossy surface	414d

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

In order to be able to understand the above objectives, features and advantages of the present invention more clearly, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other if there is no conflict.

In the following description, many specific details are explained in order to fully understand the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

Referring to FIG. 2, the present invention provides a light source system 100. Specifically, the light source system 100 includes a first light source assembly 101c, a shaping element 112, a second light source assembly 101b, a first guide element 114, and a polarizing assembly 1112. Among them, the first light source assembly 101c is used to emit the first laser light including the blue laser, the shaping element 112 is used to expand the divergence angle of the first laser light and obtain the shaping light, and the second light source assembly 101b is used to emit the second light and shaping The light and the second light are guided by the first guiding element 114 and then travel along the same path to obtain synthesized light; the polarizing component 1112 is used to convert the synthesized light into illumination light of the same polarization state.

In this embodiment, both the first light source assembly 101c and the second light source assembly 101b are used to emit laser light, which has good directivity and a small divergence angle. The first laser light emitted by the first light source assembly 101c includes a blue laser. After the blue laser passes through the shaping element 112, the angular distribution is shaped, and the divergence angle is enlarged, so that the light spot of the blue laser incident on the polarization assembly 1112 becomes larger, and the incident polarization is reduced. The power density of the blue laser on the component 1112 increases the service life of the polarizing component 1112 and improves the reliability of the light source system 100.

Further, the first light source assembly 101c is used to emit a first laser, and the first laser includes a blue laser. Preferably, the center wavelength of the blue laser is 465 nm. In this embodiment, the first laser is a blue laser. In other embodiments, the first laser includes a blue laser and lasers of other colors, such as a red laser or a green laser. Correspondingly, the first light source assembly 101c includes at least a laser for emitting blue laser light. In an embodiment in which the first laser light includes a red laser or a green laser, the first light source assembly 101c also includes lasers of other corresponding colors. Specifically, the number of lasers of different colors in the first light source assembly 101c can be selected as required.

The second light source assembly 101b is used to emit second light. In this embodiment, the second light includes a red laser and a green laser, and the first laser and the second light form three primary colors. In other embodiments, the second light is fluorescence, or a mixed light of laser and fluorescence. For example, the second light may include lasers of any color, and may be at least one of red, green, and blue lasers, and the second light may also include lasers of other colors, and is not limited to the foregoing. It can be understood that the number of different color lasers in the second light source assembly 101b can be selected according to actual needs. In the embodiment where the second light is fluorescence, the second light source assembly 101b is used to emit fluorescence. Specifically, the second light source assembly 101b includes an excitation light source and a wavelength conversion device, and the wavelength conversion device is used for the excitation light emitted from the excitation light source. At least one color of fluorescence emitted from the second light source assembly 101b is generated under excitation. In the embodiment where the second light is a mixed light of laser and fluorescence, the second light source assembly 101b includes an excitation light source and a wavelength conversion device, wherein the excitation light source is used to emit excitation light, and the wavelength conversion device is used to generate excitation light under the excitation of the excitation light. At least one color of the fluorescence emitted from the second light source assembly 101b, and the laser light emitted from the second light source assembly 101b may come from the excitation light source, for example, the laser light emitted by the excitation light source is reflected by the wavelength conversion device and then exits the second light source assembly 101b , Or the laser light emitted by the second light source assembly 101b comes from other lasers in the second light source assembly 101b.

In one embodiment, the shaping element 112 includes a first scattering element, such as a diffuser. As shown in FIG. 1, the shaping element 112 is a transmissive scattering element. In one embodiment, the diffuser has a rough surface for scattering light. Further, the light-emitting surface of the diffuser is provided with scattering particles for scattering the light. The scattering particles are different from the internal medium of the diffuser. When the first laser The propagation direction of the light is deflected when it exits from the internal medium of the scattering sheet to the scattering particles. In other embodiments, the shaping element 112 may also be a scattering wheel.

The polarizing component 1112 is used to convert incident light into light of the same polarization state. The polarizing component 1112 can be a polarization beam splitter (PCS, Polarization conversion system), a polarization beam splitter (PBS, polarization beam splitter), a polarization grating, or Other optical components that need to be glued to change the polarization state of incident light. For example, the polarizing component 1112 is a PCS, the polarizing component includes a half-wave plate 1112b, the light of the P polarization state in the incident light of the polarizing component 1112 is converted to the S polarization state after passing through the half-wave plate 1112b, which is beneficial to improve the light efficiency of the system . It can be understood that the polarizing component 1112 can also be used to convert incident light into P-polarized light to exit.

As shown in FIG. 2, the light source system 100 is provided with a double compound eye 1111 at a position adjacent to the polarizing component 1112. The shaped light and the second light are guided by the first guide element 114 and transmitted along the same optical path. The synthesized light obtained passes through the double compound eye 1111. When incident to the polarizing component 1112, the double compound eyes 1111 homogenize the light, which is beneficial to obtain a higher utilization rate of light energy and uniform illumination of a large area.

The first guiding element 114 in the light source system 100 is used to guide the shaped light and the second light to transmit along the same optical path and obtain the synthesized light. The divergence angle of the shaped light in the synthesized light with respect to the first light becomes larger, and the light spot becomes larger. The distribution is more uniform, to avoid the uneven distribution of the first laser causing partial area aging failure of the polarizing component 1112. After shaping, the laser spot area is increased and the optical power density per unit area is reduced, thereby extending the service life of the polarizing component 1112 , The reliability of the light source system 100 is improved. The shaped light in the synthesized light and the second light are transmitted along the same optical path, which is beneficial for other optical elements to guide the synthesized light to enter the polarizing component 1112 for polarization. In this embodiment, the first guiding element 114 uses wavelength-combined light. Since the shaped light is a scattered blue laser, the second light is a red laser and a green laser. The first guiding element 114 is used to reflect and transmit the shaped light. The second light, specifically, the first guide element 114 is used to reflect blue light and transmit yellow light. In one embodiment, the first guiding element 114 uses area coating to guide light. For example, the first guiding element 114 is provided with an anti-reflection coating in the central area, and the area outside the anti-reflection coating is provided with a highly reflective coating. The directivity of the light is better, and the divergence angle of the light is small. The shaping light is the first laser with the expanded divergence angle. The divergence angle of the light is larger. The spot is larger. The second light can pass through the anti-reflection coating with a small area and the light loss is small. Since the anti-reflection coating can be set to be small according to the diameter of the second light, most of the shaped light can be reflected by the first guide element 114 After the reflection of the coating, it transmits along the same optical path as the second light and obtains the synthesized light. It is understandable that in the case where the shaping light and the second light both include lasers of multiple colors, the transmissive coating and the reflective coating on the first guiding element 114 can be set according to wavelength characteristics. In a modified embodiment, the light emitting direction of the shaping element 112 and the second light source assembly 101b are the same (parallel), and the first guiding element 114 may not be provided in the light source system 100. Taking FIG. 2 as an example, the shaping element 112 is provided The position and direction of the second light source assembly 101b are the same as the light emitting direction of the second light source assembly 101b. For example, the shaped light and the second light are emitted in the bottom-up direction in FIG. 2. The shaped light and the second light do not need to pass through the first guide element 114 It can be transmitted along the same optical path to the same optical element surface, such as the second scattering element 115 in FIG. 2. In this case, the first guiding element 114 is not required.

Further, in order to prevent the speckle effect of the synthesized light from affecting the uniformity of light output of the light source system 100, the light source system 100 may be provided with a second scattering element 115 between the first guiding element 114 and the double compound eye 1111. In this embodiment, the first The second scattering element 115 is a scattering wheel, which is used to rotate periodically under the control of a driving signal. It can be understood that the second scattering element 115 may also be other optical devices for scattering light, such as a scattering sheet.

As shown in FIG. 2, the light source system 100 is also provided with a lens 113 and a lens 117. After the first laser is scattered by the shaping element 112, the angular distribution is shaped to obtain shaped light, and the shaped light is focused by the lens 113 and irradiated to the first guide element 114. The second light is focused by the lens 117 and irradiated to the first guiding element 114, and the first guiding element 114 guides the emitted synthesized light to enter the second scattering element 115. The spot size on the first guiding element 114 and the scattering element 115 is related to the angular distribution of the light incident on the lens 113 and the lens 117, that is, the size of the blue laser spot on the first guiding element 114 and the scattering element 115 is opposite to the shaping element 112 The degree of light divergence is related to the degree of diffusion, and the focusing process of the lens 113 and the lens 117 on the light is a process of converting the angular distribution to the surface distribution. Specifically, the parameters of the shaping element 112 can be adjusted to control the divergence angle of the shaping light. The larger the divergence angle of the shaping light, the larger the light spot formed on the first guiding element 114 and the second scattering element 115. In this embodiment, the shaping element 112 is the first scattering element, and the corresponding parameter affecting the divergence angle of the shaped light is the scattering angle of the first scattering element.

As shown in FIG. 2, the light source system 100 further includes a third light source assembly 120 and a light combining element 109. The third light source assembly 120 is used to emit third light. In this embodiment, the third light is fluorescence; the light combining element 109 is used to guide the third light and the synthesized light to be transmitted to the polarizing component 1112 along the same path, and the polarizing component 1112 is used to convert incident light into illumination light of the same polarization state. The incident light includes the third light e, the shaping light and the second light c.

Further, the third light source assembly 120 includes an excitation light source 101a and a wavelength conversion element 107, wherein the excitation light source 101a is used to emit excitation light, the surface of the wavelength conversion element 107 is provided with a wavelength conversion material, and the wavelength conversion material is used to convert the incident excitation light For conversion into at least one color of fluorescence, the wavelength conversion material may be phosphor, quantum dots or other materials for wavelength conversion.

Specifically, the excitation light source 101a is used to emit a blue laser of 455 nm, and the excitation light source 101a includes a blue laser. In other embodiments, the excitation light source 101a can also be used to emit blue laser light in a wavelength range other than 455 nm, or excitation light of other colors, such as ultraviolet light. It can be understood that, in one embodiment, the excitation light source 101a includes a light-emitting diode for emitting excitation light. It can be understood that one or more lasers or light-emitting diodes can be provided in the excitation light source 101a, and the specific number can be selected according to needs.

The wavelength conversion element 107 is used to convert excitation light into at least one color of fluorescence. In an optional embodiment, the wavelength conversion element 107 is a reflective color wheel, and the wavelength conversion element 107 includes a substrate 107a and is fixed on the bottom of the substrate. The drive unit 107b. The substrate 107a is periodically rotated under the driving of the driving unit 107b, thereby alleviating the thermal saturation of the wavelength conversion material on the substrate 107a caused by the high power density excitation light irradiating the substrate 107a, which is beneficial to improve the conversion efficiency of the wavelength conversion element 107.

In this embodiment, the substrate 107a is provided with a red section and a green section. The red section and the green section are periodically located on the light path of the excitation light under the driving of the driving unit 107b, and the red section is provided with a red wavelength conversion Materials, such as red phosphors, green section is provided with green wavelength conversion materials, such as green phosphors, red phosphors and green phosphors are respectively used to generate red fluorescence and green fluorescence under excitation of excitation light. In one embodiment, a yellow phosphor is provided on the substrate 107a, and the yellow phosphor generates yellow fluorescence under the excitation of the excitation light. In one embodiment, the substrate 107a is provided with a red section, a green section, and a yellow phosphor. Section or orange section, each section is provided with corresponding color phosphor. In one embodiment, the substrate 107a is further provided with a filter unit, and the fluorescence emitted by the substrate 107a is filtered by the filter unit and then exits from the wavelength conversion element 107, thereby improving the color purity of the emitted light, which is beneficial to expand the light source system 100 color gamut range. It is understandable that the third light source assembly 120 may also be separately provided with a filter unit for filtering fluorescence. In one embodiment, the wavelength conversion element 107 is a transmissive color wheel or a fluorescent sheet. In a modified embodiment, the third light source assembly 120 is also used to emit laser light, and the emitted laser light may originate from the excitation light source 101a or other lasers.

As shown in FIG. 2, the third light source assembly 120 is further provided with a second guide element 105. The second guiding element 105 is used to guide the excitation light to be incident on the wavelength conversion material of the wavelength conversion element 107 and to guide the fluorescence emitted by the wavelength conversion element 107 to irradiate the light combining element 109. In this embodiment, since the colors of the excitation light and the fluorescence are different, the wavelength conversion element 107 can guide the light by means of wavelength splitting. Specifically, the second guiding element 105 is a dichroic plate for reflecting blue light and transmitting yellow light. In other embodiments, the second guiding element 105 can flexibly set the reflection and transmission characteristics according to the colors of the excitation light and fluorescence. In an optional embodiment, the second guiding element 105 guides the excitation light and the fluorescence by means of regional coating. Fluorescence.

The third light source assembly 120 is also provided with a homogenizing element 103, a lens 102, a lens 104, a collecting lens 106, and a relay lens 108. Specifically, the excitation light sequentially passes through the lens 102, the homogenizing element 103, the lens 104, the second guiding element 105, and the collecting lens 106, and then enters the wavelength conversion element 107, and excites the wavelength conversion material to generate fluorescence of the corresponding color. The wavelength conversion element 107 The emitted fluorescence sequentially passes through the collection lens 106, the second guide element 105, and the relay lens 108, and then enters the light combining element 109. The homogenizing element 103 is used to homogenize the light, and can be a diffuser, a square rod or a compound eye. The collecting lens 106 is used to focus the excitation light into a small area on the surface of the substrate 107a, and to collimate the fluorescence emitted from the substrate 107a.

The structure of the light combining element 109 is shown in FIGS. 3A and 3B. The light combining element 109 includes a coating area 109a and an edge area 109b. The coating area 109a and the edge area 109b do not overlap on the surface of the light combining element 109. The coating area 109a is set on the surface of the light combining element 109, such as the central area of the surface of the light combining element 109. But it is not limited to the central area, and the edge area 109b is arranged around the coating area 109a. The coating area 109a is used for receiving the second light of the scattered synthetic light emitted by the second scattering element 115, and the edge area 109b is used for receiving the third light and the shaped light of the synthetic light emitted by the second scattering element 115. It is defined that the light emitted by the second scattering element 115 to the light combining element 109 is scattered light, so the coating area 109a is used to receive the second light of the scattered light, and the edge area 109b is used to receive the third light and the shaped light of the scattered light. That is, the first laser light is incident on the edge area 109b of the light combining element 109 after being scattered by the shaping element 112 and the second scattering element 115 respectively.

The light combining element 109 is coated with a high-reflection film in the coating area 109a on the fluorescent light exit surface to reflect light, and the edge area 109b of the light combining element 109 on the light exit surface is provided with a blue reflective coating to reflect blue light Transmit other colors of light. Preferably, the light combining element 109 is plated with an anti-reflection film on the surface of the light incident side of the fluorescent light to reduce the reflection phenomenon of the fluorescent light on the light incident side, which is beneficial to improve the light efficiency.

As shown in FIG. 2, the laser spot distribution on the light combining element 109 will be converted into the incident angle distribution of the double compound eye 1111, and finally into the incident light spot distribution of the polarization component 1112. Wherein, the angular distribution of the second light emitted by the scattering element 115 is converted into a spot distribution of the second light in the coating area 109a. The divergence angle of the second light emitted by the second light source assembly 101b is small, so the spot of the second light in the coating area 109a is also small. The second light is reflected by the coating area 109a, so the size of the coating area 109a is small, which can ensure the fluorescent light effect in the third light. Since the divergence angle of the first laser light emitted by the first light source assembly 101c is small, the spot distribution of the blue laser light on the light combining element 109 is mainly related to the scattering angle of the shaping element 112. By controlling the divergence angle of the shaping light emitted by the shaping element 112, the spot size of the blue laser on the light combining element 109 can be controlled, thereby increasing the size of the blue laser spot incident on the polarizing component 1112 and reducing the incident blue laser on the polarizing component 1112. The optical power density of the laser improves the reliability of the polarizing component 1112. At the same time, the coating area 109a and the edge area 109b both reflect the blue laser. The blue laser in the first laser has no transmission loss at the coating area 109a. Increasing the size of the blue laser spot does not affect the size of the coating area 109a, which can ensure fluorescent light. effect.

In addition, the light source system 100 is provided with a relay lens on both the incident path and the exit path of the light combining element 109. The scattered light is imaged to the light combining element 109 through the relay lens 116a and the relay lens 116b. The relay lens 116a and the relay The lens 116b is used to adjust the divergence angle of the scattered light incident on the light combining element 109 to adjust the spot size of the scattered light incident on the light combining element 109. The synthesized light emitted by the light combining element 109 is collimated by the relay lens 110 and then incident To the double compound eye 1111, the third light emitted by the second guiding element 105 passes through the relay lens 108 to adjust the emission angle and then forms an intermediate image A in the coating area 109a of the light combining element 109. In the modified embodiment, if the divergence angle and light spot of the scattered light and the third light incident on the light combining element 109 do not need to be adjusted, the relay lenses 116a, 116b, and 108 can be omitted, that is, they do not need to be installed. Following the lenses 116a, 116b, 108. When the light rays emitted by the light combining element 109 are parallel lights, the relay lens 110 may be omitted.

In the light source system 100 provided in this embodiment, the first laser light emitted by the first light source component 101c includes blue laser light. After the blue laser light passes through the shaping element 112 to expand the light divergence angle, the blue laser light enters the polarizing component 1112 and the spot becomes larger. The uniform light distribution reduces the light power density per unit area of the blue laser distributed on the polarizing component, thereby prolonging the service life of the polarizing component 1112 and improving the reliability of the light source system 100.

In one embodiment, the light source system 100 is a pure laser light source, and accordingly, the third light source assembly 120 and the light combining element 109 are omitted. In the embodiment where the light source system 100 is a pure laser light source, the blue laser in the first laser passes through the shaping element 112 to expand the divergence angle, which can also increase the incidence of the blue laser into the polarizing component 1112 and reduce the incidence of the polarizing component 1112. The blue laser power density per unit area on the 1112 increases the service life of the polarizing component 1112 and improves the reliability of the light source system 100.

Please refer to FIG. 4, which is a schematic diagram of a light source system according to a second embodiment of the present invention. The main difference between the second embodiment and the first embodiment is that the shaping element 212 is used in the light source system 200 in this embodiment to replace the shaping element 112 in the light source system 100. Specifically, the shaping element 212 is a homogenizing device, such as the single fly eye lens shown in FIG. 4, the single fly eye lens is provided with lens units t arranged in an array on the side of the single fly eye lens facing the first light source assembly 101c. The first laser light emitted by the component 101c is homogenized, so that the size of the first laser spot incident on the scattering element 115 becomes larger and the distribution is uniform. That is to say, the first laser light incident on the polarization component 1112 not only increases in size but also has a more uniform surface distribution. The aging failure of partial regions of the polarizing component 1112 is avoided, the service life of the polarizing component 1112 is prolonged, and the reliability of the light source system 200 is improved.

Please refer to FIG. 5, which is a light source system 300 provided by the third embodiment of the present invention. The main difference between the light source system 300 and the light source system 200 is that the light source system 300 uses a first guide element 314 instead of the first guide element 114 and the second scattering element 115, and in the third light source assembly 320, a reflector 302 is added, and the setting is omitted. The excitation light source 101a, the lens 102 and the light homogenizing element 103 are excited.

The first guiding element 314 is used to guide a part of the blue laser light in the shaping light to pass through the mirror 302, the lens 104, the second guiding element 105, and the collecting lens 106 in turn, and then enter the wavelength conversion element 107 as excitation light, and to guide the shaping The remaining light in the light is transmitted to the light combining element 109 along the same path as the second light, and the remaining light in the shaping light is scattered with the second light, that is, the light incident to the light combining element 109 is scattered.

Specifically, referring to FIGS. 6A and 6B in conjunction with FIG. 5, the first guiding element 314 is provided with a yellow-reflecting and blue-reflection dichroic film 314a on the light-incident surface of the shaping light for reflecting a part of the blue laser light as the excitation wavelength of the excitation light The conversion material transmits the remaining blue laser light in the shaping light to the light combining element 109, and reflects the red laser and green laser light in the second light to the light combining element 109. The light exit surface of the second light on the first guiding element 314 is The scattering surface is used to scatter the light emitted to the light combining element 109 to obtain scattered light. Preferably, the first guiding element 314 is plated with an anti-reflection film 314b on the light emitting surface of the scattered light.

In a modified embodiment, the first guide element light-splitting film 314a includes two sections, divided into a first section and a second section. The first section and the second section are periodically located between the shaping light and the first section. On the optical path of the second light, the transmission and reflection characteristics of the two sections are different. Both the first section and the second section are used to guide part of the blue laser light in the shaping light to enter the wavelength conversion element 107 as excitation light, and to scatter the second light and the remaining blue laser light in the shaping light and guide it to In the light combining element 109, the transmission and reflection characteristics of the first section and the second section are different, that is, the proportions of the blue laser in the first section and the second section guiding the shaping light as the excitation light and incident on the wavelength conversion element 107 are different . For example, the blue light transmittance of the first section (corresponding to the timing when the blue laser in the first laser is used as the excitation light) is 10%, the blue reflectance is 90%, or the blue transmittance is 20%, and the blue reflectance is Is 80%, or other ratios of blue light transmittance less than blue reflectance; the blue light transmittance of the second section (corresponding to the timing when the blue laser in the first laser is used as the primary light of the light source system 300) 80%, the blue reflectance is 20%, or other ratios of blue transmittance greater than blue reflectance. The above specific ratio is an example for explaining the embodiments of the present invention, and is not used to limit the present invention. In actual operation, a specific ratio can be set according to actual needs.

In the embodiment shown in FIG. 5, after the first laser is homogenized by the shaping element 212, on the one hand, the blue laser spot incident on the polarizing component 1112 is increased, and the reliability of the polarizing component 1112 is improved; The blue laser spot incident on the wavelength conversion element 107 is shaped (enlarged the spot area or changed the spot shape, etc.), which simplifies the light path of the light source system 300.

Please refer to FIG. 7, in the fourth embodiment of the present invention, the light source system 400 uses the first guide element 414 to replace the first guide element 314 in the light source system 300.

The structure of the first guiding element 414 is shown in FIGS. 8A and 8B. The first guiding element 414 includes a first area Y and a second area B. The first area Y is used to guide the blue laser in the shaping light as the excitation light. The wavelength conversion element 107 reflects the second light to the light combining element 109. The second area B is used to guide the blue laser light in the shaping light to enter the light combining element 109. When the second area B is located on the optical path of the shaping light, the light source system 300 stops emitting the second light.

Specifically, the first guiding element 414 is a scattering wheel, and the first guiding element 414 includes a base plate 414a and a driving unit 414b. The driving unit 414b may be a motor. Driven by the driving unit 414b, the base plate 414a rotates periodically. The substrate 414a is provided with a first area Y and a second area B on the light incident surface 414c of the first laser. The first area Y and the second area B are periodically located on the transmission path of the shaping light and the second light. The first area Y is provided with a highly reflective coating for reflecting red, green, and blue lasers, and the second area B is provided with an antireflection coating for transmitting blue lasers and transmitting red and green lasers. The first laser After passing through the first guiding element 414, the blue laser light is incident on the light combining element 109, and the second light is transmitted through the first guiding element 414 and irradiated outside the light combining element 109, so that it is not used. The light-emitting surface 414d of the first guiding element 414 is a scattering surface, and an antireflection film is provided.

The light source system 400 adopts the first guiding element 414. The light source system 400 emits blue light and yellow light in a time-division manner. The light source system 400 can be used in a projection display system of a two-chip spatial light modulator. In the case of red light and green light, the light source system 400 can be used in a projection display system with a single-chip spatial light modulator. The light emitted by the light source system 400 does not need to use three-chip spatial light modulators for modulation, which effectively reduces the inclusion of the light source system 400. The cost of the display device is low, and the single-chip or dual-chip light modulators time-division modulates the different colors of light emitted by the light source system 400, and achieves higher light efficiency on the basis of low cost.

The embodiment of the present invention also provides a display device. The display device includes the light source system 100 or the light source system 200 or the light source system 300 or the light source system 400 in the foregoing embodiments. The display device may be a projection display device or a liquid crystal display device.

It should be noted that, in each embodiment, elements with the same structure and function use the same reference numerals, and within the scope of the spirit or basic characteristics of the present invention, the technical solutions in each embodiment may be mutually applicable. For example, the third light source assembly 120 in the first embodiment and the second embodiment may be replaced with the third light source assembly 320 in the third embodiment, etc. To save space and avoid repetition, I won’t repeat them here.

For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended to fall within the claims. All changes within the meaning and scope of the equivalent elements of are included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "including" does not exclude other units or steps, and the singular does not exclude the plural. Multiple devices stated in the device claims can also be implemented by the same device or system through software or hardware. Words such as first and second are used to denote names, but do not denote any specific order.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements are made without departing from the spirit and scope of the technical solutions of the present invention.

Claims (14)

1. A light source system, characterized in that it comprises:

   The first light source assembly is used to emit the first laser light including blue laser light;

   The shaping element is used to expand the divergence angle of the first laser and obtain shaping light;

   The second light source assembly is used to emit second light;

   The first guiding element is used to guide the shaped light and the second light to travel along the same path to obtain a synthesized light; and

   The polarizing component is used to convert the synthesized light into illumination light of the same polarization state.
2. The light source system of claim 1, further comprising a double fly eye lens, and the synthesized light passes through the double fly eye lens and is incident on the polarizing component.
3. 5. The light source system according to claim 1, wherein the shaping element comprises a homogenizing element or a first scattering element.
4. 5. The light source system according to any one of claims 1 to 3, comprising a second scattering element, and the synthesized light is incident on the polarizing component after passing through the second scattering element.
5. The light source system according to any one of claims 1-3, characterized by comprising:

   The third light source component is used to emit third light; and

   The light combining element is used to guide the third light and the synthesized light to be transmitted to the polarizing component along the same path, and the polarizing component is used to convert incident light into illumination light of the same polarization state.
6. The light source system of claim 5, wherein the light combining element includes a coating area and an edge area, the coating area is used to receive the second light in the synthesized light, and the edge area is used to receive The third light and the shaping light of the synthesized light.
7. The light source system according to claim 6, wherein the parameters of the shaping element are adjustable to control the divergence angle of the shaping light, and the greater the divergence angle of the shaping light, the The larger the spot formed on it.
8. The light source system according to claim 5, wherein the third light source assembly comprises a wavelength conversion element, and a wavelength conversion material is provided on the surface of the wavelength conversion element, and the wavelength conversion material is used to convert incident excitation light For at least one color of fluorescence.
9. 8. The light source system of claim 8, wherein the third light source assembly includes an excitation light source for emitting the excitation light.
10. The light source system according to claim 8, wherein the first guide element is used to guide a part of the blue laser light in the shaping light to be incident on the wavelength conversion element as the excitation light, and to guide The remaining light in the shaping light is transmitted to the light combining element along the same path as the second light, and the remaining light in the shaping light is scattered with the second light.
11. The light source system of claim 10, wherein the first guide element includes a first area and a second area, and the first area and the second area are periodically located between the shaping light and the The light path of the second light,

    The first area is used to guide the blue laser light in the shaping light to be incident to the wavelength conversion element as the excitation light, to scatter the second light, and to guide the second light to be incident to the Combined light element

    The second area is used to scatter the blue laser light in the shaping light and guide it to the light combining element.
12. The light source system according to claim 10, wherein the first guide element is used to guide part of the blue laser light in the shaping light to be incident on the wavelength conversion element as the excitation light, and to The second light and the remaining blue laser light in the shaping light are scattered and guided to the light combining element.
13. The light source system of claim 12, wherein the first guide element includes a first section and a second section, and the first section and the second section are periodically located in the shaping On the optical path of light and the second light,

    The first section and the second section are both used to guide part of the blue laser light in the shaping light to be incident on the wavelength conversion element as the excitation light, and to treat the second light and the shaping light The remaining blue laser light in the light scatters and guides it to the light combining element,

    The first section and the second section guide the blue laser light in the shaping light as the excitation light to enter the wavelength conversion element at different proportions.
14. A display device, characterized by comprising the light source system according to any one of claims 1-13.

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