WO2020057299A1

WO2020057299A1 - Light source system and projection equipment

Info

Publication number: WO2020057299A1
Application number: PCT/CN2019/100490
Authority: WO
Inventors: 郭祖强; 杜鹏; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2018-09-20
Filing date: 2019-08-14
Publication date: 2020-03-26
Also published as: CN114563908B; CN114563908A; CN110928121A; CN110928121B

Abstract

A light source system and projection equipment using the light source system. The light source system comprises a light source (101), a beam splitting device (207), a wavelength converting apparatus (204), a uniformizing device (202) provided between the wavelength converting apparatus (204) and the beam splitting device (207), and a light path adjusting apparatus (107) for adjusting a light path; the light path adjusting apparatus (107) is provided facing the beam splitting device (207), and used for adjusting the direction of a beam emitted from the beam splitting device (207); excitation light is uniformized by the uniformizing device (202) and then enters the wavelength converting apparatus (204) to be converted into a stimulated light, the stimulated light enters the uniformizing device (202) in the direction opposite to the incident direction of the excitation light so as to be uniformized, the stimulated light uniformized by the uniformizing device (202) passes through the beam splitting device (207) and the light path adjusting apparatus (107) to form outgoing light, and the uniformizing device (202) uniformizes both the excitation light and the stimulated light. By means of the design of a light path, the light source system implements twice uniformizion of the light path using only one uniformizing device (202), thereby saving space, reducing costs, effectively improving the projection effect, uniformzing light, and achieving good user experience.

Description

Light source system and projection equipment

Technical field

The present invention relates to the field of optical technology, and in particular, to the field of projection display.

Background technique

At present, projection display is applied to all aspects of life, and its core part is a spatial light modulator. Common spatial light modulators include MEMS (MEMS, Micro Electromechanical System) technology digital micromirror device DMD (Digital Micromirror Device, digital micromirror device), HTPS (High Temperature, Poly-Silicon high temperature polysilicon) LCD display chip And reflective LCD device LCOS. According to the number of spatial light modulators in the projection system, they are generally divided into single-chip and three-chip projection systems. Monolithic projection systems occupy most of the low-end market due to their simple structure and low cost. At present, most spatial light modulators are passive and require an illumination light with high color and brightness uniformity. Therefore, a more complicated optical system and a combination of light sources must be designed to obtain a uniform and sufficient light source system. Taking a monolithic DMD system as an example, the light source needs to provide RGB illumination light in time. Therefore, the light source system needs to turn on the monochromatic light in time sequence or realize the time-varying transmission wave band through the filter. In order to provide uniform illumination, the light source system must also be provided with a homogenizing device such as a square rod to uniformize the light.

In the prior art projection system, a plurality of homogenizing devices are usually required to uniformize the light beams of different optical paths such as excitation light and laser light. For example, in the optical path of laser-excited phosphor, a homogenizing device is required to distribute the Gaussian The laser beam is shaped into a uniformly distributed geometric spot, which excites the phosphor to generate high-brightness fluorescence. In the light path of the spatial light modulator, the illumination light needs to be uniformized by a homogenizing device, and a uniform image is formed on the surface of the spatial light modulator Illumination spot to obtain a uniform projected image. The introduction of these devices not only increases the cost of the system, but also increases the difficulty of optical design and the space volume of the system.

Therefore, it is necessary to provide a new light source system to solve the above problems.

Summary of the Invention

The technical problem mainly solved by the present invention is to provide a light source system and a projection device, which can save space, reduce costs, and effectively improve the projection effect, make the light uniform, and have a good user experience.

In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a light source system, which includes a light source for emitting excitation light, a light splitting device disposed in front of the light source, and a wavelength disposed on an optical path of the excitation light. A conversion device, a homogenizing device provided between the wavelength conversion device and the light splitting device, and a light path adjusting device for adjusting an optical path; the light path adjusting device and the light splitting device are disposed opposite to each other for adjusting The direction of the light beam emitted by the spectroscopic device; the excitation light is homogenized by the homogenizing device to be converted into a receiving laser by the wavelength conversion device, and the receiving laser enters the uniformity in a direction opposite to the incident direction of the excitation light The homogenization device is homogenized, and the laser light that is homogenized by the homogenization device forms outgoing light through the spectroscopic device and the optical path adjustment device, and the homogenization device simultaneously performs the excitation light and the laser light reception. Even light.

Preferably, the wavelength conversion device includes at least two phosphor regions and a specular reflection region that pass through the optical path of the excitation light in time.

Preferably, the central region of the spectroscopic device is provided with a coating film that allows the excitation light to pass therethrough, a peripheral region of the spectroscopic device is a highly reflective lens, and the excitation light is transmitted to the spectroscopic device through the central area of the spectroscopic device. In a wavelength conversion device, the received laser light is reflected by the spectroscopic device.

Preferably, the homogenizing device is a fly-eye lens, and a microlens unit is provided on the microlens unit, and the microlens unit converts a surface distribution of a light spot on a side away from the wavelength conversion device into an angular distribution at an outgoing light.

Preferably, the angular distribution of the excitation light emitted after the homogenization by the homogenizing device is the same as the angular distribution of the received laser light. .

Preferably, the light source further includes a relay system for adjusting an optical path, and the relay system includes a first relay lens provided between the light splitting device and the light path adjusting device, and the receiving device And a second relay lens with the light path adjusting device.

Preferably, the light collection system includes at least one convex lens.

Preferably, the optical path of the excitation light entering the homogenization device and the optical path of the excitation light emitted from the homogenization device are parallel to each other and do not overlap.

Preferably, the light source includes a first light source emitting a first excitation light and a second light source emitting a second excitation light, and the polarization states of the first excitation light and the second excitation light are different.

Preferably, the spectroscopic device includes a first polarization region that reflects the second excitation light and transmits the first excitation light, and a second polarization region that reflects the first excitation light and transmits the second excitation light.

Preferably, a quarter-wave plate is further provided between the homogenizing device and the spectroscopic device, and the specular reflection area is coated with a polarization-maintaining scattering material.

Preferably, the light source system further includes a second light source emitting a second light and a reflecting mirror, and the second light source generates a second light for improving a display color gamut through the reflecting mirror and the laser receiving light to improve A display color gamut of the light source system, and the reflector is configured to guide the second light to the homogenizing device.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a projection device including the light source system of any one of the foregoing.

The beneficial effect of the present invention is that, different from the situation of the prior art, the present invention provides a light source system and a projection device using the light source system. The light source system includes a light source for emitting excitation light and a light splitting set in front of the light source. A device, a wavelength conversion device provided on the optical path of the excitation light, a homogenization device provided between the wavelength conversion device and the spectroscopic device, and a light path adjustment device for adjusting the light path; the light path adjustment device and the light splitter The devices are oppositely arranged, and are used to adjust the direction of the light beam emitted from the spectroscopic device; the excitation light is uniformized by the homogenizing device, and then converted into the receiving laser light by the wavelength conversion device. The direction of incidence is opposite to that of the homogenizing device, and the received laser light homogenized by the homogenizing device forms outgoing light through the spectroscopic device and the optical path adjustment device. The homogenizing device simultaneously The excitation light and the laser receiving light are homogenized. The light source system of the present invention adopts the design of the optical path, the optical path of the laser beam and the excitation light are coincident and pass through the same homogenizing device, and only one homogenizing device is used to realize the two homogenization of the optical path, which can save space and reduce cost, Can effectively improve the projection effect, make the light uniform, and have a good user experience.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic structural diagram of a first embodiment of a light source system according to the present invention;

2 is a schematic structural diagram of a wavelength conversion device according to a first embodiment of a light source system according to the present invention;

3 is a schematic structural diagram of a light splitting device according to a first embodiment of the light source system of the present invention;

4 is a schematic diagram of an angular distribution of a first embodiment of a light source system of the present invention on a spatial light modulator;

5 is a schematic structural diagram of a second embodiment of a light source system according to the present invention;

6 is a schematic structural diagram of a spectroscopic device according to a second embodiment of a light source system according to the present invention;

7 is a schematic diagram of an angular distribution of a second embodiment of a light source system of the present invention on a spatial light modulator;

8 is a schematic structural diagram of a third embodiment of a light source system according to the present invention;

FIG. 9 is a schematic structural diagram of a fourth embodiment of a light source system according to the present invention.

detailed description

It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

Example one

Please refer to FIG. 1 to FIG. 4. The light source system provided by the present invention includes a light source 101, a homogenization device 202, a wavelength conversion device 204, a light collection system 105, a relay system 106, a light splitting device 207, and an optical path adjustment device 107.

The light source 101 is used as a light source for emitting excitation light, and the spectroscopic device 207 is disposed on one side of the light source along the optical path of the excitation light. Specifically, in this embodiment, the light source 101 is a blue laser that emits blue excitation light, and the spectroscopic device 207 is a spectroscopic lens. The light path adjustment device 107 is a reflection device in this embodiment, and may be a transmission device in other optional embodiments. The excitation light emitted from the light source 101 enters the wavelength conversion device 204 obliquely, that is, when the excitation light emitted from the light source 101 enters the light collection system 105, the main axis of the excitation light beam does not overlap the optical axis of the light collection system 105. Specifically, the excitation light emitted by the light source 101 enters the homogenization device 202 for homogenization under the guidance of the spectroscopic device 207, and the homogenized excitation light enters the light collection system 105 in a direction deviating from the main optical axis of the light collection system 105. And the incident wavelength conversion device 204 is inclined.

The wavelength changing device 204 is a color wheel, which includes at least two phosphor 2042 regions and a specular reflection region 2041 passing through the excitation light optical path in sequence. The excitation light emitted by the light source enters the homogenizing device 202 as the incident light and is homogenized, and then converted into the received laser light by the wavelength conversion device 204. The combined light of the reflected light at the wavelength conversion device 204 that is subjected to the laser light and the excitation light enters the homogenizing device 202 in the irradiation direction opposite to the incident light and is homogenized, and the laser light that is homogenized by the homogenizing device passes through the spectroscopic device 207 and the The light path adjustment device 107 generates outgoing light.

As shown in FIG. 2, in this embodiment, the phosphor region 2042 of the wavelength conversion device 204 includes a red phosphor region R and a green phosphor region G, and the specular reflection region 2041 is B disposed between the two phosphor regions 2042. Area. The excitation light is excited in the red phosphor area to form red fluorescence, and the green fluorescence area is excited to form green fluorescence. The specular reflection area reflects the incident excitation light. The light source system of the present invention is applied to a projection device. The projection device is provided with a spatial light modulator 108 and a receiving device 109. The receiving device 109 is specifically a projection lens in this embodiment. The spatial light modulator 108 is disposed before the receiving device. The emitted light is adjusted by the spatial light modulator 108 to form image light carrying image information, and the receiving device 109 projects the image light to form a projected image. The optical path of the excitation light and the optical path of the emitted light are parallel to each other and do not overlap. Specifically, the multiple-reflection of the received laser light after passing through the homogenizing device through the spectroscopic device 207 and the optical path adjustment device 107 forms an outgoing optical path parallel to the incident optical path. Specifically, in this embodiment, the light path adjustment device 107 is a flat mirror. One side of the spectroscopic device 207 is used to transmit the excitation light, and the other side surface has a reflection function. Preferably, an included angle between the reflecting mirror and the spectroscopic device 207 is a right angle, so that the formed optical path of the outgoing light is parallel to the optical path of the incident light.

As shown in FIG. 3, the central region of the spectroscopic device 207 is provided with a plating film 2071 through which excitation light passes, and the peripheral region of the spectroscopic device 207 is a highly reflective lens 2072. Specifically, in the present embodiment, the plating film in the center region is a blue-transmitting yellowing coating film. The blue excitation light emitted from the light source is transmitted to the wavelength conversion device 204 through the central region, and after passing through the wavelength conversion device 204, it passes through the spectroscopic device 207 and is reflected away from the surface of the light source 101.

The homogenizing device 202 and the light collection system 105 are provided between the light source 101 and the wavelength conversion device 204. The light collection system 105 includes at least one convex lens. Specifically, in this embodiment, there are three convex lenses having a common optical axis. The excitation light emitted by the light source is homogenized by the homogenization device 202 and collected by the light collection system 105 and converted into the wavelength conversion device 204 at a small angle. The formed light is reflected by the laser light and the excitation light at the wavelength conversion device 204. The combined light passes through the back-diffusion effect of the light collection system 105 and is then homogenized again by the homogenizing device 202 and then transmitted to the receiving device 109 through the spectroscopic device 207 and the reflecting mirror 107 to form outgoing light. The optical path of the excitation light is coincident with the optical path of the laser light, and the excitation light and the laser light pass through the same homogenizing device 202 to realize light combining.

Preferably, the homogenizing device 202 is a fly-eye lens, and the fly-eye lens is provided with a microlens unit arranged in a matrix for converting a surface distribution far from the surface of one side of the wavelength conversion device into an angular distribution at the emitted light. The angular distribution of the excitation light emitted after the homogenization by the homogenization device is the same as the angular distribution of the received laser light.

The relay system 106 is used to adjust the optical path. In this embodiment, the relay system 106 includes a first relay lens 106 a provided between the light splitting device 207 and the optical path adjusting device 107, and a receiving device 109 and the optical path adjusting device 107. Between the second relay lens 106b.

Referring to FIG. 4, after the uniformized illumination light is completely reflected by the spectroscopic device 207, it is formed on the surface of the spatial light modulator 108 through the action of the first relay lens 106 a, the optical path adjustment device 107, and the second relay lens 106 b. Even lighting spot. According to the conversion relationship of the optical expansion amount, the microlens unit on the left surface of the homogenizing device 202 is superimposed and imaged on the surface of the spatial light modulator 108. The blue illumination light, red fluorescence, and green fluorescence all cover several units on the left surface of the homogenizing device 202. Therefore, after the homogenization at the homogenizing device 202, a complete and uniform illumination spot is formed at the spatial light modulator 108. The spot distribution on the right surface of the homogenization device 202 will be converted into the angular distribution of the illumination light at the spatial light modulator 108. As shown in FIG. 4, the red and green fluorescence 1081 occupies the entire space light modulator 108, and the blue illumination light 1082 occupies only the upper half of 202, so the angular distribution when the blue illumination light enters the spatial light modulator 108 is not a complete circle.

Example two

As shown in FIG. 5 and FIG. 6, this is a second embodiment of the present invention, which is an improvement based on the first embodiment, and is substantially the same as the first embodiment. The light source system includes a light source 101 and a uniform light source. Illuminating device 202, wavelength conversion device 204, light collection system 105, relay system 106, light splitting device 207, reflector 107, spatial light modulator 108, and receiving device 109. The only difference is that in this embodiment, the light source 101 includes a first light source 101a that emits a first excitation light and a second light source 101b that emits a second excitation light, wherein the polarization states of the first excitation light and the second excitation light are different. The first light source 101a emits a blue laser beam with p polarization, and the second light source 101b emits a blue laser beam with s polarization. The spectroscopic device 207 includes a first polarization region (A region) that reflects the second excitation light and transmits the first excitation light, and a second polarization region (B region) that reflects the first excitation light and transmits the second excitation light. In this way, the first light source 101a and the second light source 101b are transmitted from the corresponding regions, respectively.

As shown in FIG. 7, in this embodiment, the blue illumination light beam emitted from the right surface of the homogenizing device 202 can fill the entire exit surface. Therefore, when converted into an angular distribution at the spatial light modulator 108, the blue illumination light The angular distribution of 1082 is the same as the angular distribution of red-green fluorescence 1081, which can obtain better color consistency.

Example three

As shown in FIG. 8, this is a third embodiment of the present invention, which is an improvement based on the foregoing embodiments, and is substantially the same as the first two embodiments. The light source system includes a light source 101, a homogenizing device 202, and a wavelength. The conversion device 304, the light collection system 105, the relay system 106, the spectroscopic device 307, the reflector 107, the spatial light modulator 108, and the receiving device 109. The only difference is that in this embodiment, a quarter-wave plate 302 is further provided between the homogenizing device 202 and the spectroscopic device 307, and the specular reflection region of the wavelength conversion device 304 is coated with a polarization-maintaining scattering material. Specifically, in this embodiment, a silver-coated material is used. Since the blue excitation light and blue illumination light pass through the quarter-wave plate 302 twice during the process of entering and exiting the homogenizing device 202, the polarization state is changed, and it is reflected at the reflection lens 307, and the red and green light Forming the same light distribution into the spatial light modulator 108 can achieve better uniformity.

Embodiment 4

As shown in FIG. 9, it is a fourth embodiment of the present invention, which is an improvement based on the foregoing embodiment, and is substantially the same as the foregoing embodiment. The light source system includes a light source 101, a homogenizing device 202, and a wavelength conversion device. 204. A light collection system 105, a relay system 106, a spectroscopic device 207, a reflector 107, a spatial light modulator 108, and a receiving device 109. The difference is that in this embodiment, the light source system further includes a lighting system for improving the display color gamut of the system, the lighting system includes a second light source 201 for generating a second light for improving the display color gamut, Light is irradiated onto the condenser mirror 205 and the reflector 407 of the surface of the homogenizing device near the wavelength converter. The second light source 201 is a red laser or a green laser, and the second light is mixed with the laser receiving light through the reflector to improve the display color gamut of the light source system. A laser relay mirror 203 is also provided in front of the second light source 201. The reflecting mirror 407 is a small reflecting mirror with blue-transparent and yellow-reflecting properties.

The blue excitation light emitted from the light source 101 is transmitted to the spectroscopic device 207. After the homogenization device 202 is homogenized, the condenser lens 205 and the light collection system 105 act on the surface of the wavelength conversion device 204 to form a uniform excitation spot. The excitation wavelength conversion device 204 generates a time series The blue illumination light and fluorescence are received by the laser, and enter the homogenization device 202 at a small angle through the light collection system 105 and the condenser lens 205. After the homogenization device 202 is homogenized, the subsequent optical system acts on the spatial light modulator 108 to form a uniform Light spot. The second light source 201 emits red and green laser light and is converged by the laser relay mirror 203 on the reflecting mirror 407, and is reflected at a certain divergence angle on the reflecting mirror 407. After the action of the condenser lens 205, the homogenizing device 202 is incident at a small angle, and is homogenized After the device 202 is uniformized, a uniform illumination spot is formed at the spatial light modulator 108 to improve the display color gamut of the system.

The beneficial effect of the present invention is that, different from the situation of the prior art, the present invention provides a light source system and a projection device using the light source system. The light source system includes a light source for emitting excitation light and a light splitting set in front of the light source. A device, a wavelength conversion device provided on the optical path of the excitation light, a homogenization device provided between the wavelength conversion device and the spectroscopic device, and a light path adjustment device for adjusting the light path; the light path adjustment device and the light splitter The devices are oppositely arranged, and are used to adjust the direction of the light beam emitted from the spectroscopic device; the excitation light is uniformized by the homogenizing device, and then converted into the receiving laser light by the wavelength conversion device. The direction of incidence is reversed into the homogenizing device to be homogenized, and the laser light that has been homogenized by the homogenizing device forms outgoing light through the spectroscopic device and the optical path adjustment device, and the homogenizing device simultaneously The excitation light and the received laser light are homogenized. The light source system of the present invention adopts the design of the optical path, the optical path of the laser beam and the excitation light are coincident and pass through the same homogenizing device, and only one homogenizing device is used to realize the two homogenization of the optical path, which can save space and reduce costs, and Can effectively improve the projection effect, make the light uniform, and have a good user experience.

The invention also provides a projection device comprising the light source system as described above, which has the characteristics of uniform projection, good effect and small space occupation.

The above description is only an embodiment of the present invention, and thus does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly applied to other related technologies The same applies to the fields of patent protection of the present invention.

Claims

A light source system, characterized in that the light source system includes a light source for emitting excitation light, a spectroscopic device provided in front of the light source, a wavelength conversion device provided on the excitation light optical path, and the wavelength conversion device and the The homogenizing device between the light splitting devices and a light path adjusting device for adjusting an optical path; the light path adjusting device is disposed opposite to the light splitting device and is used to adjust the direction of a light beam emitted from the light splitting device; the excitation light After being homogenized by the homogenizing device, the wavelength conversion device is converted into a receiving laser, and the receiving laser enters the homogenizing device in a direction opposite to the incident direction of the excitation light, and is uniformized by the homogenizing device. The converted laser light is emitted through the light-splitting device and the optical path adjustment device, and the homogenizing device uniformly irradiates the excitation light and the laser light simultaneously.
The light source system according to claim 1, wherein the wavelength conversion device comprises at least two phosphor regions and a specular reflection region which pass through the excitation light optical path in time sequence.
The light source system according to claim 2, wherein a coating film is provided in a central region of the spectroscopic device to pass the excitation light, and a peripheral region of the spectroscopic device is a highly reflective lens, and the excitation light passes through A central region of the spectroscopic device is transmitted to the wavelength conversion device, and the received laser light is reflected by the spectroscopic device.
The light source system according to claim 3, wherein the homogenizing device is a fly-eye lens, and a microlens unit is provided on the microlens unit, and the microlens unit converts a surface distribution away from a surface on one side of the wavelength conversion device. Is the angular distribution at the exit light.
The light source system according to claim 4, wherein the excitation light emitted after being homogenized by the homogenizing device is the same as the angular distribution of the received laser light.
The light source system according to claim 1, wherein the light source further comprises a relay system for adjusting an optical path, and the relay system includes a first section provided between the light splitting device and the optical path adjusting device. A relay lens and a second relay lens disposed behind the light path adjusting device.
The light source system according to claim 1, wherein the light source system further comprises a light collection system, and the light collection system comprises at least one convex lens.
The light source system according to claim 1, wherein the optical path of the excitation light entering the homogenization device and the optical path of the excitation light emitted from the homogenization device are parallel to each other and do not overlap.
The light source system according to claim 2, wherein the light source comprises a first light source emitting a first excitation light and a second light source emitting a second excitation light, the first excitation light and the second excitation light The polarization of light is different.
The light source system according to claim 9, wherein the spectroscopic device comprises a first polarization region that reflects the second excitation light and transmits the first excitation light, and a second polarization region that reflects the first excitation light and transmits the second excitation light. .
The light source system according to claim 2, wherein a quarter-wave plate is further provided between the homogenizing device and the spectroscopic device, and the specular reflection region is coated with a polarization-maintaining scattering material.
The light source system according to claim 2, wherein the light source system further comprises a second light source emitting a second light and a reflecting mirror, and the second light is mixed with the laser receiving light through the reflecting mirror to improve the light source. The display color gamut of the light source system, and the reflector is configured to guide the second light to the homogenizing device.
A projection device, comprising the light source system according to any one of claims 1 to 12.