WO2021008330A1 - Système de source de lumière et dispositif d'affichage - Google Patents

Système de source de lumière et dispositif d'affichage Download PDF

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Publication number
WO2021008330A1
WO2021008330A1 PCT/CN2020/098500 CN2020098500W WO2021008330A1 WO 2021008330 A1 WO2021008330 A1 WO 2021008330A1 CN 2020098500 W CN2020098500 W CN 2020098500W WO 2021008330 A1 WO2021008330 A1 WO 2021008330A1
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WIPO (PCT)
Prior art keywords
light
light source
shaping
source system
guide
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PCT/CN2020/098500
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English (en)
Chinese (zh)
Inventor
胡飞
郭祖强
鲁宁
李屹
Original Assignee
深圳光峰科技股份有限公司
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Publication of WO2021008330A1 publication Critical patent/WO2021008330A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/206—Control of light source other than position or intensity
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2073—Polarisers in the lamp house
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light

Definitions

  • the present invention relates to the field of projection technology, in particular to a light source system and a display device.
  • 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.
  • LCD Liquid Crystal Display
  • DLP Digital Light Processor
  • LCoS Liquid Crystal on Silicon
  • 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.
  • 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.
  • 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.
  • 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. .
  • PCS Polarization conversion system, polarization beam splitting device
  • 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
  • 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.
  • the first laser light emitted by the first light source assembly includes blue laser light.
  • 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.
  • Fig. 1 is a schematic diagram of the structure of a conventional polarizing assembly.
  • FIG. 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.
  • FIG. 4 is a schematic diagram of the mechanism of the light source system provided by the second embodiment of the present invention.
  • FIG. 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.
  • 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 present invention provides a light source system 100.
  • 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.
  • 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
  • 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.
  • 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.
  • the first light source assembly 101c is used to emit a first laser, and the first laser includes a blue laser.
  • the center wavelength of the blue laser is 465 nm.
  • the first laser is a blue laser.
  • the first laser includes a blue laser and lasers of other colors, such as a red laser or a green laser.
  • the first light source assembly 101c includes at least a laser for emitting blue laser light.
  • 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.
  • the second light includes a red laser and a green laser, and the first laser and the second light form three primary colors.
  • the second light is fluorescence, or a mixed light of laser and fluorescence.
  • 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.
  • the second light source assembly 101b is used to emit fluorescence.
  • 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.
  • 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.
  • 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.
  • 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 .
  • the polarizing component 1112 can also be used to convert incident light into P-polarized light to exit.
  • 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.
  • 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.
  • 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 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.
  • 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.
  • the transmissive coating and the reflective coating on the first guiding element 114 can be set according to wavelength characteristics.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the light source system 100 is also provided with a lens 113 and a lens 117.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • the wavelength conversion material may be phosphor, quantum dots or other materials for wavelength conversion.
  • 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.
  • 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 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.
  • 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.
  • a yellow phosphor is provided on the substrate 107a, and the yellow phosphor generates yellow fluorescence under the excitation of the excitation light.
  • 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.
  • 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.
  • the third light source assembly 120 may also be separately provided with a filter unit for filtering fluorescence.
  • the wavelength conversion element 107 is a transmissive color wheel or a fluorescent sheet.
  • 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.
  • 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.
  • the wavelength conversion element 107 can guide the light by means of wavelength splitting.
  • the second guiding element 105 is a dichroic plate for reflecting blue light and transmitting yellow light.
  • the second guiding element 105 can flexibly set the reflection and transmission characteristics according to the colors of the excitation light and fluorescence.
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the relay lens 110 may be omitted.
  • the first laser light emitted by the first light source component 101c includes blue laser light.
  • 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.
  • 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.
  • 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.
  • FIG. 4 is a schematic diagram of a light source system according to a second embodiment of the present invention.
  • 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.
  • 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.
  • 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.
  • FIG. 5 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.
  • 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.
  • the first guiding element 314 is plated with an anti-reflection film 314b on the light emitting surface of the scattered light.
  • 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.
  • 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 .
  • 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.
  • 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.
  • 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.
  • the light source system 300 stops emitting the second light.
  • the first guiding element 414 is a scattering wheel
  • 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
  • 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.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un système de source de lumière (100, 200, 300) et un dispositif d'affichage, le système de source de lumière (100, 200, 300) comprenant : un premier ensemble source de lumière (101c) servant à émettre une première lumière laser comprenant une lumière laser bleue ; un composant de mise en forme (112, 212) servant à étendre l'angle de divergence de la première lumière laser pour obtenir une lumière mise en forme; un second ensemble source de lumière (101b) servant à émettre une seconde lumière ; un premier élément de guidage (114, 314, 414) servant à guider la lumière mise en forme et la seconde lumière pour les amener à se déplacer le long du même trajet et obtenir une lumière synthétisée ; et un ensemble de polarisation (1112) utilisé pour convertir la lumière synthétisée en une lumière d'éclairage ayant le même état de polarisation. Dans le système de source de lumière (100, 200, 300), la première lumière laser émise par le premier ensemble source de lumière (101c) comprend une lumière laser bleue ; après que la lumière laser bleue a passé à travers l'angle de divergence agrandi de l'élément de mise en forme (112, 212), le point lumineux de la lumière laser bleue incidente sur le composant de polarisation (1112) devient plus grand et uniforme, prolongeant la durée de vie du composant de polarisation (1112) et améliorant la fiabilité du système de source de lumière (100, 200, 300).
PCT/CN2020/098500 2019-07-12 2020-06-28 Système de source de lumière et dispositif d'affichage WO2021008330A1 (fr)

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