WO2021135958A1 - 一种投影显示系统 - Google Patents

一种投影显示系统 Download PDF

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Publication number
WO2021135958A1
WO2021135958A1 PCT/CN2020/137087 CN2020137087W WO2021135958A1 WO 2021135958 A1 WO2021135958 A1 WO 2021135958A1 CN 2020137087 W CN2020137087 W CN 2020137087W WO 2021135958 A1 WO2021135958 A1 WO 2021135958A1
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WIPO (PCT)
Prior art keywords
light
illuminating
display system
time sequence
projection display
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PCT/CN2020/137087
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English (en)
French (fr)
Inventor
郭祖强
杜鹏
李屹
Original Assignee
深圳光峰科技股份有限公司
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Priority claimed from CN202010395857.3A external-priority patent/CN113126409B/zh
Application filed by 深圳光峰科技股份有限公司 filed Critical 深圳光峰科技股份有限公司
Publication of WO2021135958A1 publication Critical patent/WO2021135958A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • 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

Definitions

  • This application relates to the field of optical technology, and in particular to a projection display system.
  • the temperature tolerance of the spatial light modulator is one of the factors that limit the display brightness of the system.
  • the tolerable temperature of the spatial light modulator depends on the temperature of its working area, and the working area temperature is the product of the energy load of the working area and the package thermal resistance R (Thermal Resistance).
  • the energy load includes the electrical energy load and the illuminating light of the spatial light modulator.
  • the power loss depends on the driving voltage and operating frequency of the spatial light modulator, and the light energy load of the illuminating light is determined by the energy of the illuminating light incident on the spatial light modulator.
  • the spatial light modulator can withstand the load of light energy, which is the key factor that ultimately limits the brightness of the system's display.
  • the illuminating light incident on different spatial light modulators is usually distributed according to the color requirements. This distribution method usually makes the optical power of a spatial light modulator far longer. The optical power higher than another spatial light modulator results in a large load redundancy of some spatial light modulators, which limits the brightness of the system.
  • the main problem to be solved by this application is how to maximize the brightness of the projection display system and realize high-brightness display.
  • the technical solution adopted in this application is to provide a projection display system, which includes: a light source for emitting illumination light; a light energy equalization device located in the exit light path of the light source, using To decompose the illumination light into light beams that are transmitted along at least two light channels, and the light energy corresponding to the light beams of each light channel is balanced; the light modulation device includes a light modulator correspondingly arranged on the light channel, Each of the light modulators is used to receive the light beam on the corresponding optical channel, and perform optical modulation on the received light beam.
  • the light energy equalization device is a coated spectroscopic device; the spectroscopic device is used to decompose the incident illuminating light into two light beams according to the set transmittance by configuring the film layer parameters. For the light beam transmitted by the channel, the light energy of the light beams corresponding to the two optical channels is balanced.
  • the light source is used to emit the first illuminating light and the second illuminating light in time sequence; the light splitting device is also used to split the wavelength of the first illuminating light into the first light along the first time sequence.
  • the first light transmitted by the channel and the second light transmitted along the second optical channel are divided into the third light traveling along the first optical channel and the second light traveling along the second light channel according to the set transmittance in the second time sequence.
  • the fourth light propagated by the optical channel; wherein the optical energy of the first light and the third light in the first optical channel is the same as the optical energy of the second light and the fourth light in the second optical channel balanced.
  • the light energy equalization device includes a polarization adjustment device and a beam splitting device, wherein the polarization adjustment device is used to change the polarization direction of the illuminating light so that the components formed in the S direction and the P direction are The light beam is in a set ratio; the light splitting device is used to decompose the adjusted illumination light into a component beam in the S direction transmitted along the first optical channel and a beam component in the P direction transmitted along the second optical channel, through The ratio is adjusted so that the light energy of the component light beam in the S direction and the light energy of the component light beam in the P direction is balanced.
  • the light source is used to emit the first illuminating light and the second illuminating light in time sequence; the polarization adjusting device is arranged in the exit light path of the second illuminating light, and is used to change the second illuminating light.
  • the polarization direction of the illuminating light is such that the component beams formed in the S and P directions are in a set proportion;
  • the light splitting device is arranged in the first illuminating light and the second illuminating light and the combined light path for the first time sequence , Splitting the wavelength of the first illumination light into the first light and the second light, and in the second time sequence, polarizing the adjusted second illumination light into the S direction transmitted along the first optical channel
  • the light energy of the first light in the first light channel and the light energy of the component light in the S direction in the first light channel is the same as the light energy of the first light in the second light channel.
  • the light energy of the two beams and the beam component in the P direction are balanced.
  • the light source is used to emit the first illuminating light and the second illuminating light in time sequence; the polarization adjusting device and the light splitting device are both set on the first illuminating light and the second illuminating light In the combined light optical path, the polarization adjustment device does not work in the first time sequence.
  • the first illuminating light is broad-spectrum light, including a first waveband light and a second waveband light
  • the second illuminating light is a third waveband light
  • the projection display system further includes:
  • the light combining device is located in the exit light path of the modulated light emitted by the light modulation device, and is used to polarize and combine the modulated light emitted by each of the light modulators or perform wavelength-synthesis at the first time sequence and perform wavelength-combination at the second time sequence. Polarized light is combined in time sequence.
  • the first optical channel or the second optical channel is provided with a polarization conversion device, which is used to perform a polarization conversion device on the third light in the first optical channel or on the second optical channel in the second time sequence.
  • the fourth light in the light channel undergoes polarization conversion so that the third light and the fourth light have different polarization states;
  • the projection display system also includes a light combining device for combining the first light with the light at the first time sequence.
  • the second light is wavelength-combined, and the third light and the fourth light are polarized-combined in the second time sequence.
  • the combined light path of the first illuminating light and the second illuminating light further includes a polarizing device for converting the first illuminating light and the second illuminating light emitted sequentially into linear polarization.
  • Illumination light a polarization conversion device is provided on the first optical channel or the second optical channel, and is used to perform the first light in the first optical channel or the second optical channel in the first time sequence Polarization conversion is performed on the second light in the first light channel, so that the first light and the second light have different polarization states, and/or the second time sequence is for the third light in the first optical channel or for the second light
  • the fourth light in the channel undergoes polarization conversion, so that the third light and the fourth light have different polarization states
  • the projection display system further includes a light combining device for performing the polarization conversion between the first timing sequence and the second timing sequence.
  • the image light emitted by the light modulation device is polarized and combined in time sequence.
  • the first illuminating light is broad-spectrum light, including red wavelength light and green wavelength light
  • the second illuminating light is blue wavelength light
  • the illumination light or the second illumination light is linearly polarized light.
  • the light source includes a first light source and a second light source
  • the first light source includes an excitation light source and a fluorescent color wheel
  • the excitation light source is used for emitting excitation light
  • the fluorescent color wheel is used for In the first time sequence, the first illumination light is generated under the excitation of the excitation light
  • the second light source is laser or LED light, and is used to emit the second illumination light in the second time sequence.
  • the light source further includes a light combining and splitting element for guiding the excitation light to the fluorescent color wheel, and for controlling the first illumination light and the second illumination light.
  • the illuminating light combines light.
  • the polarization adjusting device is a wave plate or a liquid crystal device.
  • the beneficial effect of the present application is: the projection display system in the present application splits the light energy of the light source, so that the light energy incident on the multiple light modulators is balanced, that is, the energy load of the illumination light is evenly distributed to each light modulator.
  • the overload redundancy of a certain light modulator is avoided, and then the brightness of the entire projection display system is maximized, and high-brightness display is realized.
  • Fig. 1 is a schematic diagram of a projection display system provided by the present application.
  • FIG. 2 is a schematic diagram of the structure of the film layer of the coated spectroscopic device in the present application.
  • FIG. 3 is a schematic structural diagram of a projection display system provided by Embodiment 1 of the present application.
  • FIG. 6 is a schematic structural diagram of a projection display system provided by Embodiment 2 of the present application.
  • FIG. 7 is a graph of the coating curve of the light combining device 60 in the projection display system provided by Embodiment 2 of the present application.
  • FIG. 8 is a schematic structural diagram of a projection display system provided by Embodiment 3 of the present application.
  • FIG. 9 is a graph of the coating curves of the spectroscopic device 402 and the light combining device 60 in the projection display system provided in Embodiment 3 of the present application;
  • FIG. 10 is a schematic structural diagram of a projection display system provided by Embodiment 4 of the present application.
  • FIG. 11 is a graph of the coating curve of the spectroscopic device 402 in the projection display system provided in Embodiment 4 of the present application.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be directly connected or indirectly connected through an intermediary.
  • installation and “connection” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be directly connected or indirectly connected through an intermediary.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be directly connected or indirectly connected through an intermediary.
  • the projection display system 10 specifically includes a light source 100, a light energy equalization device 200, and a light modulation device 300, wherein:
  • the light source 100 is used to emit illumination light.
  • the light energy equalization device 200 is located in the exit light path of the light source 100, and is used to process the illuminating light emitted by the light source 100, and decompose the illuminating light emitted by the light source 100 into light beams that are transmitted along multiple optical channels, and each optical channel transmits The corresponding light energy of the beam is balanced. As shown in FIG. 1, the light energy equalization device 200 divides the light beam emitted by the light source 100 into n sub-beams with equal light energy.
  • the light modulation device 300 includes a plurality of light modulators, the number of the light modulators is the same as the number of sub-beams equally divided by the light energy equalization device 200, and each light modulator is used to modulate the light beam on the corresponding light channel to obtain image light.
  • the image light of multiple light modulators synthesizes the projected image and displays it on the projection screen.
  • the light energy equalization device is used to modulate and split the illuminating light, and the illuminating light is decomposed into multiple energy-balanced sub-beams.
  • the multiple energy-balanced sub-beams are incident on multiple light modulators, so that each The light energy of the light modulator is evenly distributed, that is, the light energy load of the illuminating light is evenly distributed to each light modulator.
  • the brightness of the entire display system can be maximized to achieve High brightness display.
  • the light energy equalization device can decompose the incident illuminating light into energy-balanced sub-beams in a variety of ways.
  • the light energy equalization device is a coated spectroscopic device.
  • the optical thickness of the film layer such as single-layer film coating, multi-layer film coating
  • the refractive index of the sheet controls the transmittance of the illuminating light.
  • the thickness of the film is h
  • the refractive index is n
  • the refractive indices of the air on both sides of the film and the substrate are n 0 and n G, respectively .
  • the incident illuminating light L is reflected and refracted at both the incident film layer and the exit film layer, that is, part of the illuminating light enters the first light channel through the film layer, and the other part of the illuminating light is reflected by the film layer into the second light channel to realize the illuminating light.
  • spectroscopy the incident illuminating light L is reflected and refracted at both the incident film layer and the exit film layer, that is, part of the illuminating light enters the first light channel through the film layer, and the other part of the illuminating light is reflected by the film layer into the second light channel to realize the illuminating light.
  • the light splitting method in this embodiment is suitable for normal incidence, and the incident illuminating light has a narrow wavelength range, that is, non-broad spectrum light. If the incident illuminating light is blue light, both the first light channel and the second light channel after light splitting are also blue light. In order to make the light energy of the two light channels the same, the reflectance or transmittance of the light splitting device needs to be 0.5.
  • the optical device When it is necessary to decompose the illuminating light into multiple light channels, the optical device includes the above-mentioned multiple coated substrates.
  • the first coated substrate decomposes the illuminating light into the first light and the second light
  • the second coated substrate will The second light is decomposed into third light and fourth light, wherein the light energy of the first light, the third light and the fourth light are the same.
  • the light energy equalization device controls the illumination photoelectric field vector by adjusting the direction of the electric field of the illumination light.
  • Component formed in S direction and P direction with The ratio of S light component and P light component in the illuminating light is decomposed into the first light channel and the second light channel through the light splitting device, that is, the energy modulation of different light channels is realized by controlling the ratio of the S light component and the P light component .
  • the illuminating light in this embodiment is preferably linearly polarized light, or the illuminating light is non-polarized light, which is converted into linearly polarized light after being polarized.
  • the energy splitting method in this embodiment is suitable for a dual spatial light modulation system.
  • the light energy equalization device includes a polarization adjustment device and a beam splitting device, wherein the polarization adjustment device is used to change the polarization direction of the illumination light so that the component beams formed in the S direction and the P direction are set Constant ratio; the beam splitting device is used to transmit the component beam in the S direction and reflect the component beam in the P direction, or reflect the component beam in the S direction and transmit the component beam in the P direction to split the illumination light into the S direction along the first optical channel.
  • the light energy of the component beam in the S direction and the component beam in the P direction can be balanced by adjusting the ratio of the component beams and the beam components in the P direction transmitted along the second optical channel.
  • the projection display system implements projection display by modulating time-series light beams
  • the projection display system in which the light energy load of the illumination light can be evenly distributed to each light modulator includes:
  • a light source for emitting the first illuminating light and the second illuminating light in time sequence
  • the light energy equalization device is located in the exit light path of the first illuminating light and the second illuminating light, and is used to decompose the first illuminating light into the first light transmitted along the first light channel and the second light channel in the first time sequence
  • the transmitted second light is divided into the third light transmitted along the first optical channel and the fourth light transmitted along the second optical channel in the second timing sequence, wherein the first light in the first optical channel
  • the light energy of the first light and the third light is balanced with the light energy of the second light and the fourth light in the second light channel.
  • the optical modulation device includes a first optical modulator and a second optical modulator.
  • the first optical modulator is located in the first optical channel and receives and modulates the first light and the third light in time sequence.
  • the second optical modulator is located in the second optical channel. Receive and modulate the third light and the fourth light in time sequence;
  • the display device is used to receive the first image light emitted by the first light modulator and the second image light emitted by the second light modulator in the first time sequence, and receive the third image light emitted by the first light modulator and the second image light in the second time sequence.
  • the fourth image light emitted by the second light modulator combines the first image light, the second image light, the third image light, and the fourth image light into one frame of projected image.
  • the load of light energy carried by each light modulator is balanced.
  • first illumination light may be broad-spectrum light, such as yellow light
  • second illumination light may be blue light (blue laser or blue LED).
  • the light energy equalization device decomposes the broad-spectrum light into the first waveband light transmitted along the first optical channel at the first time sequence, and the second waveband light transmitted along the second optical channel.
  • the first waveband light is red light
  • the second waveband light is transmitted along the second optical channel.
  • the light is green.
  • the light energy equalization device also decomposes the second illumination light into the third light transmitted along the first optical channel and the fourth light transmitted along the second optical channel in the second time sequence, wherein the third light and the fourth light are both third light.
  • Band light such as blue light.
  • the light energy equalization device performs wavelength splitting on the first illuminating light to obtain the first waveband light and the second waveband light.
  • the optical power of the first waveband light decomposed I.e. light energy
  • the optical power of the second band light It is also determined. Therefore, in order to balance the light energy load of the first spatial light modulator and the second spatial light modulator, the light power of the decomposed third light And the optical power of the fourth light.
  • the optical power load of the first optical modulator and the second optical modulator are the same.
  • the spectroscopic device is a coating device when the light energy balance
  • the third band spectral light transmittance or reflectance means T B is:
  • the polarization modulation device adjusts the optical power of the component beam in the S direction And the optical power of the component beam in the P direction Meet the following conditions:
  • the light energy equalizing device's light splitting ratio to blue light in the second time sequence depends on the light power of the red and green light divided in the first time sequence.
  • FIG. 3 is a specific embodiment of the projection display system provided by the present application-Embodiment 1.
  • the projection display system in this embodiment includes a light source, a light homogenizing device 20, relay systems 30A, 30B, a light energy equalization device, a light modulation device, a light combining device 60, and a projection lens 70.
  • the light source includes a first light source 11, a second light source 12, and a light splitting and light combining element 13, wherein the first light source 11 includes an excitation light source 111 and a fluorescent color wheel 112, the first light source is blue excitation light, and the second light source is blue laser Or blue LED.
  • the first light source 11 is turned on to emit blue excitation light, and the light splitting and combining element 13 guides the blue excitation light emitted by the first light source 11 to the fluorescent color wheel 112, and the fluorescent color wheel is coated with fluorescent powder.
  • the powder is excited to emit the first illuminating light, such as yellow fluorescence.
  • the first illumination light enters the light homogenizing device 20 under the guidance of the light splitting and combining element 13.
  • the second light source 12 is turned on and emits second illumination light, such as blue light.
  • the second illumination light enters the homogenizing device 20 under the guidance of the light splitting and combining device 13.
  • the first illuminating light is yellow fluorescent light
  • the second illuminating light is blue light.
  • the light splitting and combining device 13 reflects blue light and transmits yellow light or reflects yellow light and transmits blue light.
  • the first illuminating light and the second illuminating light homogenized by the homogenizing device 20 are relayed to the light energy equalization device through the relay systems 30A and 30B.
  • the light energy equalization device is a coated spectroscope 40, which splits the light.
  • the coating curve of the mirror 40 is shown in FIG. 4, the beam splitter 40 has different transmission and reflection characteristics for red light and blue light-transmitting green and reflecting red light, and transmitting part of blue light and reflecting part of blue light. That is, the spectroscope 40 splits the wavelength of the first illumination light (Y light) into the first illumination light wavelength into the first light (red light) transmitted along the first optical channel and the first light (red light) transmitted along the second optical channel in the first time sequence.
  • the beam splitter 40 divides the second illumination light (blue light) into the third light (blue light) propagating along the first light channel and the fourth light (blue light) propagating along the second light channel according to the set transmittance in the second time sequence. .
  • the transmittance T of the beam splitter 40 needs to be in the second sequence. B meets the following conditions:
  • the light modulation device includes a first spatial light modulator 50A and a second spatial light modulator 50B.
  • the first light (red light) and the second light (green light) split by the light energy equalizing device are incident respectively
  • the first spatial light modulator 50A and the second spatial light modulator 50B in the second time sequence, the third light (reflected blue light) and the fourth light (transmitted blue light) after the light energy equalization device are split are respectively incident on The first spatial light modulator 50A and the second spatial light modulator 50B.
  • the first spatial light modulator 50A and the second spatial light modulator 50B modulate the incident light to obtain image light and emit it.
  • the light combining device 60 responds to the first image light based on the first light (red light) emitted from the first spatial light modulator 50A and the second light based on the second light (green light) emitted from the second spatial light modulator 50B.
  • the light combining device 60 combines the third image light based on the third light (reflected blue light) emitted from the first spatial light modulator 50A and the second spatial light modulator 50B.
  • the emitted fourth image light based on the fourth light (transmitted blue light) is combined.
  • the first image light, the second image light, the third image light, and the fourth image light are combined to enter the projection lens 70 for projection imaging.
  • first spatial light modulator and the second spatial light modulator are DMD (Digital Micromirror Device), and the second light source 12 emits blue laser light.
  • the laser light has good polarization characteristics and is linearly polarized light.
  • a polarization conversion device 801 is provided on the first optical channel or the second optical channel.
  • the polarization conversion device 801 does not work in the first time sequence, and the third The light or the fourth light undergoes polarization conversion so that the third light and the fourth light have different polarization states.
  • the polarization conversion device 801 in this embodiment is a wave plate or a liquid crystal device, which can change the amplitude direction of the linearly polarized illumination light.
  • the coating curve of the coating layer of the light combining device 60 is shown in FIG. 5, the light combining device transmits blue light in the P state, reflects blue light in the S state, and reflects red wavelength light and transmits green wavelength light. That is, in the first time sequence, the red first image light emitted by the first spatial light modulator is reflected, and the green second image light emitted by the second spatial light modulator is transmitted, so as to realize the separation of the first image light and the second image light. Combining light, in the second time sequence, the third image light in the S state emitted by the first spatial light modulator is reflected, and the fourth image light in the P state emitted by the second spatial light modulator is transmitted to realize the third image light and the first image light. Combination of four-image light.
  • FIG. 6 is a specific embodiment of the projection display system provided by the present application-Embodiment 2.
  • the first light modulator is LCD (Liquid Crystal Display) or LCOS (Liquid Crystal on Silicon, CMOS-LCD), and it is used in the first illuminating light and the second illuminating light.
  • a polarizing device is provided in the combined light path of the light beam. As shown in FIG. 6, a polarizer 90 arranged behind the light homogenizing device 20 is used to convert both the first illuminating light and the second illuminating light into linearly polarized light.
  • the polarizer 90 is PCS or PBS
  • the first illumination light and the second illumination light polarized by the polarizer 91 are P light or S light.
  • the first illuminating light is split into the first light and the second light by the beam splitter 40, and the second illuminating light is separated by the beam splitter 40.
  • the third light and the fourth light the coating curve of the beam splitter 40 is shown in Fig. 4
  • the first light, the second light, the third light and the fourth light are all in the S state
  • the polarization conversion device 801 is set in the second light.
  • the third light and the fourth light have different polarization states.
  • the coating curve of the light combining device 60 is shown in FIG. 7, the transmitted P state beam reflects the S state beam. Therefore, the light combining device 60 modulates the first image generated by the first light based on the polarization state in the first time sequence.
  • the light and the second image light generated by modulating the second light are polarized and combined.
  • the third image light generated by modulating the third light and the fourth image light generated by modulating the fourth light are polarized based on the difference in polarization state. Heguang.
  • the polarization conversion device 801 in this embodiment is a half-wave plate.
  • an analyzer 100A is further provided between the first spatial light modulator 50A and the light combining device 60
  • an analyzer 100B is further provided between the second spatial light modulator 50B and the light combining device 60, and To filter the image light.
  • FIG. 8 is a specific embodiment of the projection display system provided by the present application-Embodiment 3.
  • the light energy equalization device of embodiment 1 and embodiment 2 is a coated spectroscopic device, which realizes light energy modulation by controlling the transmittance of incident blue light.
  • the light energy equalization device is the polarization adjusting device 401 and the beam splitting device 402.
  • the optical power distribution is performed by adjusting the linear polarization electric field direction of the second illuminating light-blue laser.
  • the polarization modulation device adjusts the optical power of the component beam in the S direction.
  • the optical power of the component beam in the P direction Meet the following conditions:
  • the polarization adjusting device 401 is arranged in the exit light path of the second illuminating light-the blue laser, and is used to change the polarization direction of the blue laser so that the component beams formed in the S and P directions of the blue laser become set proportion.
  • the coating curve of the light combining device 60 in FIG. 8 is the same as the coating curve in FIG. 5. Because of the use of polarization energy splitting, the projection display system shown in FIG. 8 does not require a polarization conversion device 801 in the light channel.
  • the coating curve of the spectroscopic device 402 is shown in FIG. 9.
  • Fig. 10 is a specific embodiment-embodiment 4 of the projection display system provided by the present application.
  • the light energy equalization device of embodiment 2 is a coated spectroscopic device, which realizes light energy modulation by controlling the transmittance of incident blue light, while in this embodiment, the light energy equalization device is Polarization adjustment device 401 and spectroscopic device 402.
  • the polarization adjustment device only works in the second time sequence, and distributes the electric field direction of the incident blue light to realize the optical power distribution.
  • the polarization adjustment device 401 does not work in the first time sequence.
  • the first illumination light emitted in the first time sequence is split by the light splitting device 402. After the polarization conversion by the polarization conversion device 801, it is incident on the light combining device 60 for polarization combining.
  • the polarization conversion device 801 does not work in the second time sequence, and the third light and the fourth light emitted by the polarization adjustment device 401 are different Therefore, it does not need to be converted by the polarization conversion device to realize polarization combining at the light combining device 60.
  • the coating curve of the light combining device in this embodiment is the same as the curve shown in FIG. 7.
  • the coating curve of the spectroscopic device 402 is shown in 11.
  • the spectroscopic device has different transmittance and reflection characteristics for the blue light in the P state and the S state, and has different transmittance and reflection characteristics for the red light and the green light in different polarization states, thereby achieving the Blue light splitting, red light and green light splitting.

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Abstract

一种投影显示系统（10），包括：光源（100），用于出射照明光；光能量均衡装置（200），位于光源（100）的出射光路中，用于将照明光分解成沿至少两个光通道传输的光束，且各个光通道的光束对应的光能量均衡；光调制装置（300），包括对应设置在光通道上的光调制器，每个光调制器用于接收相对应光通道上的光束，并对接收到的光束进行光调制。照明光的光能量负载均匀分配到每个光调制器上，在光调制器满足额定耐受稳定条件下，能够使整个投影显示系统（10）的亮度最大化，实现高亮度显示。

Description

一种投影显示系统 技术领域
本申请涉及光学技术领域，具体涉及一种投影显示系统。
背景技术
在投影显示系统中，空间光调制器的耐受温度是限制系统显示亮度的因素之一。空间光调制器的耐受温度取决于其工作区域的温度，而工作区温度是工作区能量负载与封装热阻R(Thermal Resistance)的乘积，能量负载包含空间光调制器的电能负载和照明光的光能负载，其中电能损耗取决于空间光调制器的驱动电压和工作频率，而照明光的光能负载是由入射空间光调制器的照明光的能量决定。
因此，在使用指定空间光调制器时，空间光调制器能够承受光能负载量，是最终限制系统显示亮度的关键因素。然而，在多片式空间光调制器系统中，入射不同空间光调制器上的照明光通常是根据颜色的需要进行光谱的分配，这种分配方式通常会使得一个空间光调制器的光功率远高于另一个空间光调制器的光功率，导致部分空间光调制器负载冗余较大，限制了系统的亮度。
发明内容
本申请主要解决的问题是如何实现投影显示系统的亮度最大化，实现高亮度显示。
为解决上述技术问题，本申请采用的技术方案是提供一种投影显示系统，该投影显示系统包括：光源，用于出射照明光；光能量均衡装置，位于所述光源的出射光路中，用于将所述照明光分解成沿至少两个光通道传输的光束，且各个所述光通道的光束对应的光能量均衡；光调制装 置，包括对应设置在所述光通道上的光调制器，每个所述光调制器用于接收相对应光通道上的光束，并对接收到的所述光束进行光调制。
在一个实施例中，所述光能量均衡装置为镀膜的分光器件；所述分光器件，用于通过配置膜层参数，按照设定的透射率将入射的所述照明光分解成沿两个光通道传输的光束，两个所述光通道对应的光束的光能量均衡。
在一个实施例中，所述光源，用于时序出射第一照明光和第二照明光；所述分光器件，还用于在第一时序将所述第一照明光波长分光为沿第一光通道传输的第一光和沿第二光通道传输的第二光，在第二时序按照设定的透射率将所述第二照明光分成沿第一光通道传播的第三光及沿第二光通道传播的第四光；其中，所述第一光通道中的第一光和第三光的光能量与所述第二光通道中所述第二光和所述第四光的光能量均衡。
在一个实施例中，所述光能量均衡装置包括偏振调节装置和分光装置，其中，所述偏振调节装置，用于改变所述照明光的偏振方向，使其在S方向和P方向形成的分量光束成设定比例；所述分光装置，用于将调节后的所述照明光分解成沿第一光通道传输的S方向的分量光束和沿第二光通道传输的P方向的光束分量，通过调整所述比例使得S方向的分量光束和P方向的分量光束的光能量均衡。
在一个实施例中，所述光源，用于时序出射第一照明光和第二照明光；所述偏振调节装置设置在所述第二照明光的出射光路中，用于改变所述第二照明光的偏振方向，使其在S和P方向形成的分量光束成设定比例；所述分光装置设置在所述第一照明光和第二照明光和合光光路中，用于在第一时序，将所述第一照明光波长分光为所述第一光和所述第二光，在第二时序，将调整后的所述第二照明光偏振分光成沿第一光通道传输的S方向的分量光束和沿第二光通道传输的P方向的光束分量；其中，所述第一光通道中的第一光和S方向的分量光束的光能量与所述第二光通道中所述第二光和所述P方向的光束分量的光能量均衡。
在一个实施例中，所述光源，用于时序出射第一照明光和第二照明 光；所述偏振调节装置和所述分光装置均设置在所述第一照明光和所述第二照明光的合光光路中，所述偏振调节装置在所述第一时序不工作。
在一个实施例中，所述第一照明光为宽谱光，包括第一波段光和第二波段光，所述第二照明光为第三波段光。
在一个实施例中，所述投影显示系统还包括：
合光装置，位于所述光调制装置出射的调制光的出射光路中，用于对各个所述光调制器出射的调制光进行偏振合光或者在第一时序进行波长合光且在第二时序进行偏振合光。
在一个实施例中，所述第一光通道或所述第二光通道上设置有偏振转换装置，用于在第二时序对所述第一光通道中的第三光或对所述第二光通道中的第四光进行偏振转换，使得第三光和第四光具有不同的偏振态；所述投影显示系统还包括合光装置，用于在第一时序将所述第一光和所述第二光进行波长合光，在所述第二时序对所述第三光和所述第四关进行偏振合光。
在一个实施例中，在所述第一照明光和所述第二照明光的合光光路中还包括起偏装置，用于将时序出射的第一照明光和第二照明光转换为线偏振照明光；在所述第一光通道或所述第二光通道上设置有偏振转换装置，用于在第一时序对所述第一光通道中的第一光或对所述第二光通道中的第二光进行偏振转换，使得所述第一光和第二光具有不同的偏振态，和/或第二时序对所述第一光通道中的第三光或对所述第二光通道中的第四光进行偏振转换，使得所述第三光和第四光具有不同的偏振态；所述投影显示系统还包括合光装置，用于在所述第一时序和所述第二时序对光调制装置出射的图像光进行偏振合光。
在一个实施例中，所述第一照明光为宽谱光，包括红色波段光和绿色波段光，所述第二照明光为蓝色波段光。
在一个实施例中，所述照明光或所述第二照明光为线偏振光。
在一个实施例中所述光源包括第一光源和第二光源，所述第一光源包括激发光源和荧光色轮；所述激发光源，用于发射激发光；所述荧光色轮，用于在第一时序，在所述激发光的激发下产生第一照明光；所述 第二光源为激光或者LED光，用于在第二时序出射第二照明光。
在一个实施例中，所述光源还包括合光分光元件，所述合光分光元件用于将所述激发光引导至所述荧光色轮，且对所述第一照明光和所述第二照明光进行合光。
在一个实施例中，所述偏振调节装置为波片或液晶器件。
通过上述方案，本申请的有益效果是：本申请中的投影显示系统对光源做光能量分光，使得入射至多个光调制器的光能量均衡，即照明光的能量负载均匀分配到每个光调制器上，避免了某个光调制器负载冗余过大，继而保障了整个投影显示系统的亮度最大化，实现高亮度显示。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。其中：
图1是本申请提供的投影显示系统的示意图；
图2是本申请中镀膜的分光器件的膜层的结构示意图；
图3是本申请实施例1提供的投影显示系统的结构示意图；
图4是本申请实施例1提供的投影显示系统中分光镜40的镀膜曲线图；
图5是本申请实施例1提供的投影显示系统中合光装置60的镀膜曲线图；
图6是本申请实施例2提供的投影显示系统的结构示意图；
图7是本申请实施例2提供的投影显示系统中合光装置60的镀膜曲线图；
图8是本申请实施例3提供的投影显示系统的结构示意图；
图9是本申请实施例3提供的投影显示系统中分光装置402和合光装置60的镀膜曲线图；
图10是本申请实施例4提供的投影显示系统的结构示意图；
图11是本申请实施例4提供的投影显示系统中分光装置402的镀膜曲线图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性的劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
在本申请的描述中，需要说明的是，术语“上”、“下”、“左”、“右”、“水平”、“竖直”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。在本申请的描述中，“若干”的含义是两个或两个以上，除非另有明确具体的限定。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可根据具体情况理解上述术语在本申请中的具体含义。
本申请实施例的描述中，需要理解的是，术语“第一”、“第二”仅是为了便于描述本申请和简化描述，因此不能理解为对本申请的限制。
参阅图1，图1是本申请提供的投影显示系统10。该投影显示系统10具体包括光源100、光能量均衡装置200以及光调制装置300，其中，
光源100用于发射照明光。
光能量均衡装置200位于光源100的出射光路中，用于对光源100 出射的照明光进行处理，将光源100出射的照明光分解成沿多个光通道传输的光束，且每个光通道传输的光束对应的光能量均衡。如图1所示，光能量均衡装置200将光源100发出的光束均分成n束光能量均衡的子光束。
光调制装置300包括多个光调制器，光调制器的数量与光能量均衡装置200均分的子光束的数量相同，每个光调制器用于对相应光通道上的光束进行调制，得到图像光，多个光调制器的图像光合成投影图像并于投影屏幕中显示。
本申请中通过光能量均衡装置对照明光进行能量调制和分光，将照明光分解成多个能量均衡的子光束，多个能量均衡的子光束入射到多个光调制器，使得入射到每个光调制器的光能量平均分配，也就是照明光的光能量负载均匀分配到每个光调制器上，在光调制器满足额定耐受稳定条件下，能够使得整个显示系统的亮度最大化，实现高亮度显示。
光能量均衡装置可通过多种方式将入射的照明光分解成能量均衡的子光束。
在一个实施例中，光能量均衡装置为镀膜的分光器件，通过改变照明光入射至分光器件的入射角度、膜层的光学厚度(如镀单层膜、镀多层膜)，膜层和基片的折射率控制照明光的透射率。
如图2所示，薄膜的厚度为h，折射率为n，薄膜两边的空气和基片的折射率分别为n 0和n G。入射的照明光L在入射膜层与出射膜层处均发出反射和折射，即部分照明光透过膜层进入第一光通道，另一部分照明光被膜层反射进入第二光通道，实现照明光的分光。
本实施例中的分光方式适用于正入射，且入射的照明光波长范围窄，即非宽谱光。如入射的照明光为蓝光，分光后第一光通道和第二光通道亦均为蓝光，为了使两个光通道的光的光能量相同，需使分光器件的反射率或透射率为0.5。
当需要将照明光分解成多个光通道时，光学器件包括上述的多个镀膜的基片，如第一镀膜基片将照明光分解成第一光和第二光，第二镀膜基片将第二光分解成第三光和第四光，其中第一光、第三光和第四光的 光能量相同。
在另一个实施例中，光能量均衡装置通过调节照明光的电场方向，控制照明光电场矢量
Figure PCTCN2020137087-appb-000001
在S方向和P方向形成的分量
Figure PCTCN2020137087-appb-000002
和
Figure PCTCN2020137087-appb-000003
的比例，在通过分光装置将照明光中的S光分量和P光分量分解到第一光通道和第二光通道，即通过控制S光分量和P光分量的比例实现不同光通道的能量调制。
本实施例中的照明光优选为线偏振光，或者照明光为非偏振光，经起偏后转换为线偏振光。此外本实施例中的能量分光方式适用于双空间光调制系统。
具体的，为了实现上述的偏振能量分光，光能量均衡装置包括偏振调节装置和分光装置，其中，偏振调节装置用于改变照明光的偏振方向，使得在S方向和P方向形成的分量光束成设定比例；分光装置用于透射S方向的分量光束反射P方向的分量光束，或反射S方向的分量光束透射P方向的分量光束，以将照明光分解成沿沿第一光通道传输的S方向的分量光束和沿第二光通道传输的P方向的光束分量，通过调整分量光束的比例使得S方向的分量光束和P方向的分量光束的光能量均衡。
在一个实施例中，若投影显示系统通过对时序的光束进行调制实现投影显示，则能够实现照明光的光能量负载均匀分配到每个光调制器上的投影显示系统，包括：
光源，用于时序出射第一照明光和第二照明光；
光能量均衡装置，位于第一照明光和第二照明光的出射光路中，用于在第一时序将第一照明光分解成沿第一光通道传输的第一光和沿第二光通道传输的第二光，在第二时序将第二照明光分解成沿第一光通道传输的第三光和沿第二光通道传输的第四光，其中，所述第一光通道中的第一光和第三光的光能量与所述第二光通道中所述第二光和所述第四光的光能量均衡。
光调制装置包括第一光调制器和第二光调制器，第一光调制器位于第一光通道，时序接收并调制第一光和第三光，第二光调制器位于第二 光通道，时序接收并调制第三光和第四光；
显示装置，用于在第一时序接收第一光调制器出射的第一图像光和第二光调制器出射的第二图像光，第二时序接收第一光调制器出射的第三图像光和第二光调制器出射的第四图像光，将第一图像光、第二图像光、第三图像光和第四图像光合成为一帧投影图像。
本实施例中，在一帧投影图像的显示时间内，每个光调制器承载的光能量负载均衡。
进一步的，上述的第一照明光可以是宽谱光，如黄光，第二照明光可以是蓝光(蓝激光或蓝光LED)。光能量均衡装置在第一时序将宽谱光分解成沿第一光通道传输的第一波段光，沿第二光通道传输的第二波段光，如第一波段光为红光，第二波段光为绿光。光能量均衡装置还在第二时序将第二照明光分解成沿第一光通道传输的第三光和沿第二光通道传输的第四光，其中第三光和第四光均为第三波段光，如蓝光。
在第一时序，光能量均衡装置对第一照明光进行波长分光，得到第波段光和第二波段光。在第一照明光光谱一定的情况下，分解出的第一波段光的光功率
Figure PCTCN2020137087-appb-000004
(即光能量)与第二波段光的光功率
Figure PCTCN2020137087-appb-000005
也是确定的，因此，为了使第一空间光调制器和第二空间光调制器的光能量负载均衡，分解的第三光的光功率
Figure PCTCN2020137087-appb-000006
和第四光的光功率
Figure PCTCN2020137087-appb-000007
需满足如下关系：
Figure PCTCN2020137087-appb-000008
若第一波段光(红光)的归一化光功率为28.4％，第二波段光(绿光)的归一化的光功率为41.4，则：
Figure PCTCN2020137087-appb-000009
如表1所示，经光能量分配后，第一光调制器和第二光调制器的光功率负载相同。
表1
Figure PCTCN2020137087-appb-000010
Figure PCTCN2020137087-appb-000011
再此基础上，若光能量均衡装置为镀膜的分光器件，则分光器件对第三波段光的透过率或反射率T B为:
Figure PCTCN2020137087-appb-000012
若光能量均衡装置为偏振调节装置和分光装置，则偏振调制装置调节的S方向的分量光束的光功率
Figure PCTCN2020137087-appb-000013
和P方向的分量光束的光功率
Figure PCTCN2020137087-appb-000014
满足如下条件为：
Figure PCTCN2020137087-appb-000015
本实施例中光能量均衡装置在第二时序对蓝光的分光比例取决于第一时序所分红绿光的光功率。
请参考图3，图3是本申请提供的投影显示系统的一个具体的实施例-实施例1。
如图3所示，本实施例中的投影显示系统包括光源、匀光器件20、中继系统30A、30B、光能量均衡装置、光调制装置、合光装置60和投影镜头70。其中光源包括第一光源11、第二光源12和分光合光元件13，其中第一光源11包括激发光源111和荧光色轮112，第一光源为蓝色激发光，第二光源为蓝色激光或者蓝光LED。在第一时序，第一光源11开启，出射蓝色激发光，分光合光元件13将第一光源11出射的蓝色激发光引导至荧光色轮112，荧光色轮上涂覆荧光粉，荧光粉受激发出射第一照明光，如黄荧光。第一照明光在分光合光元件13的引导下入射至匀光器件20。在第二时序，第二光源12开启，出射第二照明光，如蓝光。第二照明光在分光合光器件13的引导下入射至匀光器件20。
在一个实施例中，第一照明光为黄荧光，第二照明光为蓝光。分光合光器件13反射蓝光透射黄光或者反射黄光透射蓝光。
经匀光器件20均光后的第一照明光和第二照明光经中继系统30A、 30B中继至光能量均衡装置，本实施例中，光能量均衡装置为镀膜的分光镜40，分光镜40的镀膜曲线如图4所示，分光镜40对红光和蓝光具有不同的透反特征-透射绿反射红光，且透射部分蓝光反射部分蓝光。即分光镜40在第一时序将第一照明光(Y光)波长分光为第一照明光波长分光为沿第一光通道传输的第一光(红光)和沿第二光通道传输的第二光(绿光)。分光镜40在第二时序按照设定的透过率将第二照明光(蓝光)分成沿第一光通道传播的第三光(蓝光)及沿第二光通道传播的第四光(蓝光)。
如上文所述，为了调制第一光和第三光的光调制器与调制第二光和第四光的光调制器的光能量负载均衡，需在第二时序，分光镜40的透射率T B满足如下条件：
Figure PCTCN2020137087-appb-000016
其中，
Figure PCTCN2020137087-appb-000017
为第一光(红光)的光功率，
Figure PCTCN2020137087-appb-000018
为第二光(绿光)的光功率。
光调制装置包括第一空间光调制器50A和第二空间光调制器50B，在第一时序，经光能量均衡装置分光后的第一光(红光)和第二光(绿光)分别入射到第一空间光调制器50A和第二空间光调制器50B，在第二时序，将光能量均衡装置分光后的第三光(反射的蓝光)和第四光(透射的蓝光)分别入射到第一空间光调制器50A和第二空间光调制器50B。第一空间光调制器50A和第二空间光调制器50B对入射光进行调制得到图像光并出射。在第一时序，合光装置60对第一空间光调制器50A出射的基于第一光(红光)的第一图像光和第二空间光调制器50B出射的基于第二光(绿光)的第二图像光进行合光，在第二时序，合光装置60对第一空间光调制器50A出射的基于第三光(反射的蓝光)的第三图像光和第二空间光调制器50B出射的基于第四光(透射的蓝光)的第四图像光进行合光。第一图像光、第二图像光、第三图像光和第四图像光经合光后入射至投影镜头70进行投影成像。
进一步的，第一空间光调制器和第二空间光调制器为DMD(Digital  Micromirror Device，数字微镜器件)，第二光源12出射蓝激光，激光具有较好的偏振特性，为线偏振光。
为了实现第三图像光和第四图像光的合光，在第一光通道或第二光通道上设置偏振转换装置801，偏振转换装置801在第一时序不工作，在第二时序将第三光或第四光进行偏振转换，使得第三光和第四光具有不同的偏振态。
优选的，本实施例中的偏振转换装置801为波片或液晶器件，可以改变线偏振照明光的振幅方向。
合光装置60所镀膜层的镀膜曲线如图5所示，合光装置透射P态的蓝光反射S态的蓝光，反射红色波段光透射绿色波段光。也就是在第一时序反射第一空间光调制器出射的红色的第一图像光，透射第二空间光调制器出射的绿色的第二图像光，以实现第一图像光和第二图像光的合光，在第二时序，反射第一空间光调制器出射的S态的第三图像光，透射第二空间光调制器出射的P态的第四图像光，以实现第三图像光和第四图像光的合光。
请参考图6，图6是本申请提供的投影显示系统的一个具体的实施例-实施例2。
实施例2与实施例1的区别仅在于，第一光调制器为LCD(Liquid Crystal Display，液晶显示器)或LCOS(Liquid Crystal on Silicon，CMOS－LCD)且在第一照明光和第二照明光的合光光路中设置有起偏装置，如图6所示，设置在匀光装置20后的起偏器90，用于将第一照明光和第二照明光均转换为线偏振光。
在一个实施例中，起偏器90为PCS或PBS，经起偏器91起偏后的第一照明光和第二照明光为P光或S光。以第一照明光和第二照明光经过起偏器后的偏振态为S态为例，第一照明光被分光镜40分解为第一光和第二光，第二照明光被分光镜40分解成第三光和第四光(分光镜40的镀膜曲线如图4所示)，第一光、第二光、第三光和第四光均为S态，偏振转换装置801设置在第一光通道或第二光通道，用于将第一光 或第二光转换成P态，将第三光或第四光转换成P态，即使第一光和第二光具有不同的偏振态、第三光和第四光具有不同的偏振态。此时，合光装置60的镀膜曲线如图7所示，透射P态光束反射S态光束，因此，合光装置60在第一时序基于偏振态的不同对调制第一光产生的第一图像光和调制第二光产生的第二图像光进行偏振合光，在第二时序基于偏振态的不同对调制第三光产生的第三图像光和调制第四光产生的第四图像光进行偏振合光。
优选的，本实施例中的偏振转换装置801为半波片。
进一步的，在第一空间光调制器50A与合光装置60之间还设置有检偏器100A，在第二空间光调制器50B与合光装置60之间还设置有检偏器100B，用于过滤图像光。
请参考图8，图8是本申请提供的投影显示系统的一个具体的实施例-实施例3。
实施例3与实施例1和实施例2的区别仅在于，实施例1和实施例2的光能量均衡装置为镀膜的分光器件，通过控制入射的蓝光的透射率实现光能量调制，而本实施例中，光能量均衡装置为偏振调节装置401和分光装置402，通过调节第二照明光-蓝激光的线偏振电场方向，进行光功率分配，偏振调制装置调节的S方向的分量光束的光功率
Figure PCTCN2020137087-appb-000019
和P方向的分量光束的光功率
Figure PCTCN2020137087-appb-000020
满足如下条件为：
Figure PCTCN2020137087-appb-000021
如图8所示，偏振调节装置401设置在第二照明光-蓝激光的出射光路中，用于改变蓝激光的偏振方向，使得蓝激光在在S和P方向形成的分量光束成设定比例。
图8中的合光装置60的镀膜曲线与图5中镀膜曲线相同，由于采用偏振能量分光，因此，图8所示的投影显示系统无需在光通道中设置偏振转换装置801。分光装置402的镀膜曲线如图9所示。
请参考图10，图10是本申请提供的投影显示系统的一个具体的实 施例-实施例4。
本实施例与实施例2的区别仅在于，实施例2的光能量均衡装置为镀膜的分光器件，通过控制入射的蓝光的透射率实现光能量调制，而本实施例中，光能量均衡装置为偏振调节装置401和分光装置402。偏振调节装置仅在第二时序工作，将入射的蓝光的电场方向，实现光功率分配，偏振调节装置401在第一时序不工作，第一时序出射的第一照明光经分光装置402波长分光后，在经偏振转换装置801进行偏振转换后，入射到合光装置60进行偏振合光，偏振转换装置801在第二时序不工作，经偏振调节装置401出射的第三光和第四光具有不同的偏振态，因此无需在经过偏振转换装置进行转换，即可在合光装置60处实现偏振合光，其中本实施例中的合光装置的镀膜曲线与图7所示曲线相同。分光装置402的镀膜曲线如11所示，分光装置对P态和S态的蓝光具有不同的透反特性，且对不同偏振态的红光和绿光具有不同的透反特征，由此实现对蓝光分光、红光和绿光的分光。
以上是本申请实施例的实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请实施例原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本申请的保护范围。

Claims (15)

  1. 一种投影显示系统，其特征在于，包括：
    光源，用于出射照明光；
    光能量均衡装置，位于所述光源的出射光路中，用于将所述照明光分解成沿至少两个光通道传输的光束，且各个所述光通道的光束对应的光能量均衡；
    光调制装置，包括对应设置在所述光通道上的光调制器，每个所述光调制器用于接收相对应光通道上的光束，并对接收到的所述光束进行光调制。
  2. 根据权利要求1所述的投影显示系统，其特征在于，所述光能量均衡装置为镀膜的分光器件，其中，
    所述分光器件，用于通过配置膜层参数，按照设定的透射率将入射的所述照明光分解成沿两个光通道传输的光束，两个所述光通道对应的光束的光能量均衡。
  3. 根据权利要求2所述的投影显示系统，其特征在于，
    所述光源，用于时序出射第一照明光和第二照明光；
    所述分光器件，还用于在第一时序将所述第一照明光波长分光为沿第一光通道传输的第一光和沿第二光通道传输的第二光，在第二时序按照设定的透射率将所述第二照明光分成沿第一光通道传播的第三光及沿第二光通道传播的第四光；
    其中，所述第一光通道中的第一光和第三光的光能量与所述第二光通道中所述第二光和所述第四光的光能量均衡。
  4. 根据权利要求1所述的投影显示系统，其特征在于，所述光能量均衡装置包括偏振调节装置和分光装置，其中，
    所述偏振调节装置，用于改变所述照明光的偏振方向，使其在S方向和P方向形成的分量光束成设定比例；
    所述分光装置，用于将调节后的所述照明光分解成沿第一光通道传输的S方向的分量光束和沿第二光通道传输的P方向的光束分量，通过 调整所述比例使得S方向的分量光束和P方向的分量光束的光能量均衡。
  5. 根据权利要求4所述的投影显示系统，其特征在于，
    所述光源，用于时序出射第一照明光和第二照明光；
    所述偏振调节装置设置在所述第二照明光的出射光路中，用于改变所述第二照明光的偏振方向，使其在S和P方向形成的分量光束成设定比例；
    所述分光装置设置在所述第一照明光和第二照明光和合光光路中，用于在第一时序，将所述第一照明光波长分光为所述第一光和所述第二光，在第二时序，将调整后的所述第二照明光偏振分光成沿第一光通道传输的S方向的分量光束和沿第二光通道传输的P方向的光束分量；
    其中，所述第一光通道中的第一光和S方向的分量光束的光能量与所述第二光通道中所述第二光和所述P方向的光束分量的光能量均衡。
  6. 根据权利要求5所述的投影显示系统，其特征在于，
    所述光源用于时序出射第一照明光和第二照明光；
    所述偏振调节装置和所述分光装置均设置在所述第一照明光和所述第二照明光的合光光路中，所述偏振调节装置在所述第一时序不工作。
  7. 根据权利要求3、5-6所述的投影显示系统，其特征在于，所述第一照明光为宽谱光，包括第一波段光和第二波段光，所述第二照明光为第三波段光。
  8. 根据权利要求1-6任一所述的投影显示系统，其特征在于，所述投影显示系统还包括：
    合光装置，位于所述光调制装置出射的调制光的出射光路中，用于对各个所述光调制器出射的调制光进行偏振合光或者在第一时序进行波长合光且在第二时序进行偏振合光。
  9. 根据权利要求3所述的投影显示系统，其特征在于，所述第一光通道或所述第二光通道上设置有偏振转换装置，用于在第二时序对所述第一光通道中的第三光或对所述第二光通道中的第四光进行偏振转 换，使得第三光和第四光具有不同的偏振态；
    所述投影显示系统还包括合光装置，用于在第一时序将所述第一光和所述第二光进行波长合光，在所述第二时序对所述第三光和所述第四关进行偏振合光。
  10. 根据权利要求3或6所述的投影显示系统，其特征在于，所述投影显示系统还包括起偏装置，所述起偏装置设置在所述第一照明光和所述第二照明光的合光光路中，用于将时序出射的第一照明光和第二照明光转换为线偏振照明光；
    在所述第一光通道或所述第二光通道上设置有偏振转换装置，用于在第一时序对所述第一光通道中的第一光或对所述第二光通道中的第二光进行偏振转换，使得所述第一光和第二光具有不同的偏振态，和/或第二时序对所述第一光通道中的第三光或对所述第二光通道中的第四光进行偏振转换，使得所述第三光和第四光具有不同的偏振态；
    所述投影显示系统还包括合光装置，用于在所述第一时序和所述第二时序对光调制装置出射的图像光进行偏振合光。
  11. 根据权利要求7所述的投影显示系统，其特征在于，所述第一照明光为宽谱光，包括红色波段光和绿色波段光，所述第二照明光为蓝色波段光。
  12. 根据权利要求3-6所述的投影显示系统，其特征在于，所述照明光或所述第二照明光为线偏振光。
  13. 根据权利要求3所述的投影显示系统，其特征在于，所述光源包括第一光源和第二光源，其中，所述第一光源包括激发光源和荧光色轮，所述激发光源，用于发射激发光；所述荧光色轮，用于在第一时序，在所述激发光的激发下产生第一照明光；
    所述第二光源为激光或者LED光，用于在第二时序出射第二照明光。
  14. 根据权利要求13所述的投影显示系统，其特征在于，所述光源还包括合光分光元件，所述合光分光元件用于将所述激发光引导至所述荧光色轮，且对所述第一照明光和所述第二照明光进行合光。
  15. 根据权利要求5所述的投影显示系统，其特征在于，所述偏振调节装置为波片或液晶器件。
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