CN113126409B - Projection display system - Google Patents

Projection display system Download PDF

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Publication number
CN113126409B
CN113126409B CN202010395857.3A CN202010395857A CN113126409B CN 113126409 B CN113126409 B CN 113126409B CN 202010395857 A CN202010395857 A CN 202010395857A CN 113126409 B CN113126409 B CN 113126409B
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China
Prior art keywords
light
illumination
channel
display system
projection display
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CN202010395857.3A
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CN113126409A (en
Inventor
郭祖强
杜鹏
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Priority to PCT/CN2020/137087 priority Critical patent/WO2021135958A1/en
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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
    • G03B21/2053—Intensity control of illuminating light
    • 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
    • G03B21/2013—Plural light sources
    • 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
    • G03B21/2073—Polarisers in the lamp house

Abstract

The application discloses a projection display system, comprising: a light source for emitting illumination light; the light energy balancing device is positioned in an emergent light path of the light source and is used for decomposing the illumination light into light beams transmitted along at least two light channels, and the light energy corresponding to the light beams of each light channel is balanced; the optical modulation device comprises optical modulators correspondingly arranged on the optical channels, and each optical modulator is used for receiving the light beam on the corresponding optical channel and modulating the received light beam. The application can maximize the brightness of the whole projection display system and realize high-brightness display.

Description

Projection display system
Technical Field
The application relates to the technical field of optics, in particular to a projection display system.
Background
In projection display systems, the withstand temperature of the spatial light modulator is one of the factors limiting the brightness of the system display. The tolerance temperature of a spatial light modulator depends on the temperature of its operating region, which is the product of the operating region energy load, which comprises the electrical energy load of the spatial light modulator, which is determined by the driving voltage and operating frequency of the spatial light modulator, and the package thermal resistance R (Thermal Resistance), and the optical energy load of the illumination light, which is determined by the energy of the illumination light incident on the spatial light modulator.
Thus, when using a given spatial light modulator, the spatial light modulator is capable of withstanding the amount of light energy loading, which is a critical factor that ultimately limits the brightness of the system display. However, in a multi-plate spatial light modulator system, the illumination light incident on different spatial light modulators is generally distributed according to the color requirement, and this distribution manner generally makes the optical power of one spatial light modulator much higher than that of another spatial light modulator, so that the load redundancy of part of the spatial light modulators is large, and the brightness of the system is limited.
Disclosure of Invention
The application mainly solves the problem of maximizing the brightness of the projection display system and realizing high-brightness display.
In order to solve the technical problems, the technical scheme adopted by the application is to provide a projection display system, which comprises: a light source for emitting illumination light; the light energy balancing device is positioned in an emergent light path of the light source and is used for decomposing the illumination light into light beams transmitted along at least two light channels, and the light energy corresponding to the light beams of each light channel is balanced; the optical modulation device comprises optical modulators correspondingly arranged on the optical channels, and each optical modulator is used for receiving the light beam on the corresponding optical channel and modulating the received light beam.
In one embodiment, the light energy equalizing device is a coated light splitting device; the light splitting device is used for splitting the incident illumination light into light beams transmitted along two light channels according to the set transmissivity by configuring film parameters, and the light energy of the light beams corresponding to the two light channels is balanced.
In one embodiment, the light source is configured to emit the first illumination light and the second illumination light in a time sequence; the light splitting device is further configured to split the first illumination light wavelength into a first light transmitted along the first optical channel and a second light transmitted along the second optical channel at a first timing, and split the second illumination light into a third light transmitted along the first optical channel and a fourth light transmitted along the second optical channel according to a set transmittance at a second timing; wherein the optical energy of the first light and the third light in the first optical channel is equalized with the optical energy of the second light and the fourth light in the second optical channel.
In one embodiment, the light energy equalizing device comprises a polarization adjusting device and a beam splitting device, wherein the polarization adjusting device is used for changing the polarization direction of the illumination light so that the component light beams formed in the S direction and the P direction are in a set proportion; the beam splitting device is used for splitting 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, and the proportion is adjusted to balance the light energy of the component beam in the S direction and the light energy of the component beam in the P direction.
In one embodiment, the light source is configured to emit the first illumination light and the second illumination light in a time sequence; the polarization adjusting device is arranged in an emergent light path of the second illumination light and is used for changing the polarization direction of the second illumination light so that component beams formed in the S and P directions are in a set proportion; the light splitting device is arranged in the first illumination light path, the second illumination light path and the light combining path, and is used for splitting the first illumination light wavelength into the first light and the second light at a first time sequence, and splitting the adjusted second illumination light polarization into a component light beam in the S direction transmitted by the first light channel and a light beam component in the P direction transmitted by the second light channel at a second time sequence; wherein the light energy of the first light and the component light beam in the S direction in the first light channel is equalized with the light energy of the second light and the light beam component in the P direction in the second light channel.
In one embodiment, the light source is configured to emit the first illumination light and the second illumination light in a time sequence; the polarization adjusting device and the light splitting device are arranged in a light combining light path of the first illumination light and the second illumination light, and the polarization adjusting device does not work at the first time sequence.
In one embodiment, the first illumination light is broad spectrum light, including a first band of light and a second band of light, and the second illumination light is a third band of light.
In one embodiment, the projection display system further comprises:
and the light combining device is positioned in an emergent light path of the modulated light emergent from the light modulating device and is used for carrying out polarization light combining on the modulated light emergent from each light modulator or carrying out wavelength light combining at a first time sequence and polarization light combining at a second time sequence.
In one embodiment, the first optical channel or the second optical channel is provided with a polarization conversion device, which is used for performing polarization conversion on third light in the first optical channel or fourth light in the second optical channel at a second time sequence, so that the third light and the fourth light have different polarization states; the projection display system further comprises a light combining device for wavelength combining the first light and the second light at a first time sequence and polarization combining the third light and the fourth light at the second time sequence.
In one embodiment, a polarization device is further included in the combined light path of the first illumination light and the second illumination light, and is used for converting the first illumination light and the second illumination light emitted in time sequence into linear polarization illumination light; a polarization conversion device is arranged on the first light channel or the second light channel and is used for carrying out polarization conversion on first light in the first light channel or second light in the second light channel at a first time sequence so that the first light and the second light have different polarization states, and/or a second time sequence is used for carrying out polarization conversion on third light in the first light channel or fourth light in the second light channel so that the third light and the fourth light have different polarization states; the projection display system further comprises a light combining device, which is used for carrying out polarization light combining on the image light emitted by the light modulation device at the first time sequence and the second time sequence.
In one embodiment, the first illumination light is broad spectrum light, including red band light and green band light, and the second illumination light is blue band light.
In one embodiment, the illumination light or the second illumination light is linearly polarized light.
In one embodiment the light source comprises a first light source comprising an excitation light source and a fluorescent color wheel, and a second light source; the excitation light source is used for emitting excitation light; the fluorescent color wheel is used for generating first illumination light under the excitation of the excitation light at a first time sequence; the second light source is laser or LED light and is used for emitting second illumination light at a second time sequence.
In one embodiment, the light source further includes a light combining and splitting element, and the light combining and splitting element is configured to guide the excitation light to the fluorescent color wheel and combine the first illumination light and the second illumination light.
In one embodiment, the polarization adjustment means is a wave plate or a liquid crystal device.
Through the scheme, the application has the beneficial effects that: the projection display system of the application performs light energy beam splitting on the light source, so that the light energy incident to the light modulators is balanced, namely the energy load of illumination light is uniformly distributed on each light modulator, thereby avoiding overlarge load redundancy of a certain light modulator, further ensuring the maximum brightness of the whole projection display system and realizing high-brightness display.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
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 layers of the coated spectroscopic device of the present application;
FIG. 3 is a schematic diagram of a projection display system according to embodiment 1 of the present application;
FIG. 4 is a graph showing the coating of the beam splitter 40 in the projection display system according to the embodiment 1 of the present application;
fig. 5 is a graph showing a film coating of the light combining device 60 in the projection display system according to embodiment 1 of the present application;
FIG. 6 is a schematic diagram of a projection display system according to embodiment 2 of the present application;
fig. 7 is a graph showing a film coating of the light combining device 60 in the projection display system according to embodiment 2 of the present application;
FIG. 8 is a schematic diagram of a projection display system according to embodiment 3 of the present application;
fig. 9 is a graph showing the film deposition of the beam splitting device 402 and the beam combining device 60 in the projection display system according to embodiment 3 of the present application;
FIG. 10 is a schematic diagram of a projection display system according to embodiment 4 of the present application;
fig. 11 is a graph showing a film coating of the spectroscopic apparatus 402 in the projection display system according to embodiment 4 of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "horizontal", "vertical", "inner", "outer", etc. are directions or positional relationships based on the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, the meaning of "a number" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In describing embodiments of the present application, it should be understood that the terms "first" and "second" are merely for convenience of description and simplicity of description, and thus should not be construed as limiting the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of a projection display system 10 according to the present application. The projection display system 10 specifically includes a light source 100, a light energy equalizing device 200, and a light modulation device 300, wherein,
the light source 100 is for emitting illumination light.
The light energy equalizing device 200 is located in the outgoing light path of the light source 100, and is configured to process the illumination light emitted from the light source 100, decompose the illumination light emitted from the light source 100 into light beams transmitted along a plurality of light channels, and equalize the light energy corresponding to the light beams transmitted by each light channel. As shown in fig. 1, the light energy equalizing device 200 equally divides the light beam emitted from the light source 100 into n sub-light beams with equal light energy.
The light modulation device 300 includes a plurality of light modulators, the number of which is the same as the number of sub-beams equally divided by the light energy equalizing device 200, each light modulator is configured to modulate a light beam on a corresponding light channel to obtain image light, and the image light of the plurality of light modulators is synthesized into a projection image and displayed on a projection screen.
According to the application, the illumination light is subjected to energy modulation and light splitting through the light energy balancing device, the illumination light is decomposed into a plurality of energy-balanced sub-beams, the plurality of energy-balanced sub-beams are incident to the plurality of light modulators, so that the light energy incident to each light modulator is evenly distributed, namely, the light energy load of the illumination light is evenly distributed on each light modulator, and the brightness of the whole display system can be maximized under the condition that the light modulators meet rated tolerance stability, so that high-brightness display is realized.
The light energy equalizing device may decompose the incident illumination light into energy-equalized sub-beams in a number of ways.
In one embodiment, the light energy equalizing device is a coated light splitting device, and the refractive indexes of the film layer and the substrate control the transmittance of the illumination light by changing the incident angle of the illumination light to the light splitting device and the optical thickness of the film layer (such as single-layer film coating and multi-layer film coating).
As shown in FIG. 2, the film has a thickness h and a refractive index n, and the air on both sides of the film and the substrate have refractive indices n respectively 0 And n G . The incident illumination light L is reflected and refracted at the incident film layer and the emergent film layer, namely, part of the illumination light enters the first light channel through the film layer, and the other part of the illumination light is reflected by the film layer to enter the second light channel, so that the light splitting of the illumination light is realized.
The light splitting method in this embodiment is suitable for normal incidence, and the wavelength range of the incident illumination light is narrow, i.e. the spectrum of the light is not wide. If the incident illumination light is blue light, the first light channel and the second light channel are blue light after light splitting, and in order to make the light energy of the light of the two light channels identical, the reflectivity or the transmissivity of the light splitting device needs to be 0.5.
When it is desired to split the illumination light into a plurality of light channels, the optical device includes a plurality of coated substrates as described above, such as a first coated substrate splitting the illumination light into a first light and a second light, and a second coated substrate splitting the second light into a third light and a fourth light, wherein the first light, the third light, and the fourth light have the same light energy.
In another embodiment, the light energy equalizing means controls the illumination light electric field vector by adjusting the electric field direction of the illumination lightComponent formed in S-direction and P-direction +.>And->In the illumination light, the S-light component and the P-light component are split into the first light channel and the second light channel by the spectroscopic means, i.e. the energy modulation of the different light channels is achieved by controlling the ratio of the S-light component and the P-light component.
The illumination light in this embodiment is preferably linearly polarized light, or the illumination light is unpolarized light, and is converted into linearly polarized light after polarization. In addition, the energy beam splitting method in this embodiment is applicable to a dual spatial light modulation system.
Specifically, in order to realize the polarization energy beam splitting, the light energy balancing device comprises a polarization adjusting device and a beam splitting device, wherein the polarization adjusting device is used for changing the polarization direction of illumination light so that component light beams formed in the S direction and the P direction are in a set proportion; the beam splitting device is used for transmitting the component beam in the S direction and reflecting the component beam in the P direction, or reflecting the component beam in the S direction and transmitting the component beam in the P direction, so as to split the illumination light into the component beam in the S direction transmitted along the first optical channel and the beam component in the P direction transmitted along the second optical channel, and the proportion of the component beams is adjusted to balance the light energy of the component beam in the S direction and the component beam in the P direction.
In one embodiment, if the projection display system implements projection display by modulating the time-series light beams, the projection display system capable of uniformly distributing the light energy load of the illumination light to each light modulator includes:
a light source for sequentially emitting first illumination light and second illumination light;
and the light energy balancing device is positioned in an emergent light path of the first illumination light and the second illumination light and is used for decomposing the first illumination light into first light transmitted along the first light channel and second light transmitted along the second light channel at a first time sequence and decomposing the second illumination light into third light transmitted along the first light channel and fourth light transmitted along the second light channel at a second time sequence, wherein the light energy of the first light and the third light in the first light channel is balanced with the light energy of the second light and the fourth light in the second light channel.
The optical modulation device comprises a first optical modulator and a second optical modulator, wherein the first optical modulator is positioned in a first optical channel, receives and modulates first light and third light in a time sequence, and the second optical modulator is positioned in a second optical channel, receives and modulates third light and fourth light in a time sequence;
and the display device is used for receiving the first image light emitted by the first light modulator and the second image light emitted by the second light modulator at a first time sequence, receiving the third image light emitted by the first light modulator and the fourth image light emitted by the second light modulator at a second time sequence, and combining the first image light, the second image light, the third image light and the fourth image light into a frame of projection image.
In this embodiment, the light energy load carried by each light modulator is balanced during the display time of a frame of projected image.
Further, the first illumination light may be broad spectrum light, such as yellow light, and the second illumination light may be blue light (blue laser or blue LED). The light energy equalizing device decomposes the broad spectrum light into first band light transmitted along the first light channel at a first time sequence, and second band light transmitted along the second light channel, for example, the first band light is red light, and the second band light is green light. The light energy equalizing device also breaks down the second illumination light into a third light transmitted along the first light channel and a fourth light transmitted along the second light channel at a second timing, wherein the third light and the fourth light are both third band light, such as blue light.
And at the first time sequence, the light energy balancing device performs wavelength splitting on the first illumination light to obtain light of a first wave band and light of a second wave band. Under the condition that the spectrum of the first illumination light is fixed, the optical power of the decomposed first wave band light(i.e. light energy) and the light power of the light of the second band +.>Is also determined, therefore, in order to balance the light energy loads of the first and second spatial light modulators, the optical power of the decomposed third light +.>And optical power of the fourth light +.>The following relationship needs to be satisfied:
if the normalized optical power of the first band light (red light) is 28.4% and the normalized optical power of the second band light (green light) is 41.4%, then:
as shown in table 1, after the light energy distribution, the optical power loads of the first optical modulator and the second optical modulator are the same.
TABLE 1
On the basis, if the light energy balancing device is a coated light splitting device, the light splitting device has a transmittance or a reflectance T to light of a third wave band B The method comprises the following steps:
if the light energy equalizing device is a polarization adjusting device and a beam splitting device, the light power of the component light beam in the S direction adjusted by the polarization adjusting deviceAnd the optical power of the component beam in the P direction +.>Full of
The following conditions are:
in this embodiment, the ratio of the light energy equalizing device to the blue light at the second timing is determined by the light power of the red light and the green light separated at the first timing.
Referring to fig. 3, fig. 3 is a schematic diagram of a projection display system according to an embodiment of the present application, i.e. embodiment 1.
As shown in fig. 3, the projection display system in this embodiment includes a light source, a light equalizing device 20, relay systems 30A, 30B, a light energy equalizing device, a light modulating device, a light combining device 60, and a projection lens 70. The light source comprises a first light source 11, a second light source 12 and a light splitting and combining element 13, wherein the first light source 11 comprises 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 a blue LED. At the first time, the first light source 11 is turned on to emit blue excitation light, 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 fluorescent powder is coated on the fluorescent color wheel and excited to emit first illumination light, such as yellow fluorescence. The first illumination light is incident on the light equalizing device 20 under the guidance of the light splitting and combining element 13. At the second timing, the second light source 12 is turned on, and emits a second illumination light, such as blue light. The second illumination light is incident on the dodging device 20 under the guidance of the spectroscopic light combining device 13.
In one embodiment, the first illumination light is yellow fluorescent light and the second illumination light is blue light. The light splitting and combining device 13 reflects blue light transmitted yellow light or reflects yellow light transmitted blue light.
The first illumination light and the second illumination light after being homogenized by the homogenizing device 20 are relayed to the light energy equalizing device by the relay systems 30A and 30B, in this embodiment, the light energy equalizing device is a coated beam splitter 40, a coating curve of the beam splitter 40 is shown in fig. 4, the beam splitter 40 has different transmission and reflection characteristics for red light and blue light, namely, transmits green and reflection red light, and transmits part of blue light and reflects part of blue light. That is, the spectroscope 40 splits the first illumination light (Y light) wavelength into the first illumination light wavelength at the first timing, the first light (red light) transmitted along the first light channel and the second light (green light) transmitted along the second light channel. The beam splitter 40 splits the second illumination light (blue light) into a third light (blue light) traveling along the first light channel and a fourth light (blue light) traveling along the second light channel at a second timing according to a set transmittance.
As described above, in order to balance the light energy load of the light modulator modulating the first light and the third light and the light modulator modulating the second light and the fourth light, the transmittance T of the beam splitter 40 is required at the second timing B The following conditions are satisfied:
wherein, the liquid crystal display device comprises a liquid crystal display device,for the optical power of the first light (red light, ">Is the optical power of the second light (green light).
The light modulation device includes a first spatial light modulator 50A and a second spatial light modulator 50B, and at a first timing, the first light (red light) and the second light (green light) split by the light energy equalizing device are respectively incident on the first spatial light modulator 50A and the second spatial light modulator 50B, and at a second timing, the third light (reflected blue light) and the fourth light (transmitted blue light) split by the light energy equalizing device 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 the image light. At the first timing, the light combining device 60 combines the first image light based on the first light (red light) emitted from the first spatial light modulator 50A and the second image light based on the second light (green light) emitted from the second spatial light modulator 50B, and at the second timing, 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 fourth image light based on the fourth light (transmitted blue light) emitted from the second spatial light modulator 50B. The first image light, the second image light, the third image light and the fourth image light are incident to the projection lens 70 for projection imaging after being combined.
Further, the first spatial light modulator and the second spatial light modulator are DMDs (Digital Micromirror Device, digital micromirror devices), the second light source 12 emits blue laser light, and the laser light has good polarization characteristics and is linearly polarized light.
In order to realize the light combination of the third image light and the fourth image light, a polarization conversion device 801 is arranged on the first light channel or the second light channel, the polarization conversion device 801 does not work at the first time sequence, and the third light or the fourth light is subjected to polarization conversion at the second time sequence, so that the third light and the fourth light have different polarization states.
Preferably, the polarization conversion device 801 in this embodiment is a wave plate or a liquid crystal device, and can change the amplitude direction of linearly polarized illumination light.
As shown in fig. 5, the film coating curve of the film coating layer of the light combining device 60 is that the light combining device transmits blue light in P state, reflects blue light in S state, and transmits green wave band light. That is, the first image light of red emitted from the first spatial light modulator is reflected at the first timing sequence, the second image light of green emitted from the second spatial light modulator is transmitted to realize the light combination of the first image light and the second image light, the third image light of S state emitted from the first spatial light modulator is reflected at the second timing sequence, and the fourth image light of P state emitted from the second spatial light modulator is transmitted to realize the light combination of the third image light and the fourth image light.
Referring to fig. 6, fig. 6 is a schematic diagram of a projection display system according to an embodiment of the present application, i.e. embodiment 2.
Embodiment 2 differs from embodiment 1 only in that the first light modulator is an LCD (Liquid Crystal Display ) or an LCOS (Liquid Crystal on Silicon, CMOS-LCD) and a polarizing device is provided in the light path of the combined light of the first illumination light and the second illumination light, as shown in fig. 6, a polarizer 90 is provided behind the light uniformizing device 20 for converting both the first illumination light and the second illumination light into linearly polarized light.
In one embodiment, polarizer 90 is a PCS or PBS and the first and second illumination lights polarized by polarizer 91 are P-light or S-light. Taking the S-state polarization state of the first illumination light and the second illumination light after passing through the polarizer as an example, the first illumination light is decomposed into the first light and the second light by the beam splitter 40, the second illumination light is decomposed into the third light and the fourth light by the beam splitter 40 (the film plating curves of the beam splitter 40 are shown in fig. 4), and 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 disposed in the first light channel or the second light channel, and is used for converting the first light or the second light into the P-state, and converting the third light or the fourth light into the P-state, even if the first light and the second light have different polarization states, and the third light and the fourth light have different polarization states. At this time, as shown in fig. 7, the film coating curve of the light combining device 60 reflects the S-state light beam by the P-state light beam, so that the light combining device 60 performs polarization combination on the first image light generated by modulating the first light and the second image light generated by modulating the second light based on the difference of the polarization states at the first timing, and performs polarization combination on the third image light generated by modulating the third light and the fourth image light generated by modulating the fourth light based on the difference of the polarization states at the second timing.
Preferably, the polarization conversion device 801 in this embodiment is a half-wave plate.
Further, an analyzer 100A is provided between the first spatial light modulator 50A and the light combining device 60, and an analyzer 100B is provided between the second spatial light modulator 50B and the light combining device 60 to filter the image light.
Referring to fig. 8, fig. 8 is a schematic diagram of a projection display system according to an embodiment of the present application, i.e. embodiment 3.
Example 3 differs from example 1 and example 2 only in that the light energy equalizing means of example 1 and example 2 are light splitting devices coated with a film, and light energy modulation is achieved by controlling the transmittance of incident blue light, whereas in this example, the light energy equalizing means are polarization adjusting means 401 and light splitting means 402, and light power distribution is performed by adjusting the linear polarization electric field direction of the second illumination light-blue laser, and light power of the component light beam in the S direction adjusted by the polarization adjusting meansAnd component light in the P directionOptical power of the beam->The following conditions are satisfied:
as shown in fig. 8, a polarization adjustment device 401 is provided in the outgoing optical path of the second illumination light-blue laser light for changing the polarization direction of the blue laser light so that the blue laser light is proportionally set in the component beams formed in the S and P directions.
The film coating curve of the light combining device 60 in fig. 8 is the same as that in fig. 5, and since polarization energy beam splitting is used, the projection display system shown in fig. 8 does not need to provide a polarization conversion device 801 in the light channel. Fig. 9 shows a coating curve of the spectroscopic apparatus 402.
Referring to fig. 10, fig. 10 is a schematic diagram of a projection display system according to an embodiment of the present application, i.e. embodiment 4.
The difference between this embodiment and embodiment 2 is that the light energy equalizing device of embodiment 2 is a coated light splitting device, and light energy modulation is achieved by controlling the transmittance of the incident blue light, and in this embodiment, the light energy equalizing device is a polarization adjusting device 401 and a light splitting device 402. The polarization adjustment device only works at the second time sequence, the electric field direction of the incident blue light is distributed to realize the light power distribution, the polarization adjustment device 401 does not work at the first time sequence, the first illumination light emitted by the first time sequence is subjected to wavelength light splitting by the light splitting device 402, polarization conversion is carried out by the polarization conversion device 801, the first illumination light is incident to the light combining device 60 to be polarized and combined, the polarization conversion device 801 does not work at the second time sequence, and the third light and the fourth light emitted by the polarization adjustment device 401 have different polarization states, so that the polarization light combining can be realized at the light combining device 60 without conversion by the polarization conversion device, wherein a film coating curve of the light combining device in the embodiment is the same as that shown in fig. 7. The film coating curve of the light-splitting device 402 is shown as 11, and the light-splitting device has different transmittance and reflectance characteristics for blue light in P-state and S-state, and has different transmittance and reflectance characteristics for red light and green light in different polarization states, thereby realizing light splitting of blue light, red light and green light.
The foregoing is a description of embodiments of the present application, and it should be noted that, for those skilled in the art, modifications and variations can be made without departing from the principles of the embodiments of the present application, and such modifications and variations are also considered to be within the scope of the present application.

Claims (19)

1. A projection display system, comprising:
a light source for emitting illumination light;
the light energy balancing device is positioned in an emergent light path of the light source and is used for decomposing the illumination light into light beams transmitted along at least two light channels, and the light energy corresponding to the light beams of each light channel is balanced;
the optical modulation device comprises optical modulators correspondingly arranged on the optical channels, and each optical modulator is used for receiving the light beam on the corresponding optical channel and modulating the received light beam;
wherein the light energy balancing device is a coated light splitting device;
the light splitting device is used for splitting the incident illumination light into light beams transmitted along two light channels according to the set transmissivity by configuring film parameters, and the light energy of the light beams corresponding to the two light channels is balanced.
2. The projection display system of claim 1, wherein the display device further comprises a display device,
the light source is used for emitting first illumination light and second illumination light in a time sequence;
the light splitting device is further configured to split the first illumination light wavelength into a first light transmitted along the first optical channel and a second light transmitted along the second optical channel at a first timing, and split the second illumination light into a third light transmitted along the first optical channel and a fourth light transmitted along the second optical channel according to a set transmittance at a second timing;
wherein the optical energy of the first light and the third light in the first optical channel is equalized with the optical energy of the second light and the fourth light in the second optical channel.
3. The projection display system of claim 2 wherein the first illumination light is broad spectrum light comprising a first band of light and a second band of light, the second illumination light being a third band of light.
4. The projection display system of any of claims 1-2, further comprising:
and the light combining device is positioned in an emergent light path of the modulated light emergent from the light modulating device and is used for carrying out polarization light combining on the modulated light emergent from each light modulator or carrying out wavelength light combining at a first time sequence and polarization light combining at a second time sequence.
5. The projection display system of claim 2, wherein the first light channel or the second light channel is provided with polarization conversion means for polarization converting the third light in the first light channel or the fourth light in the second light channel at a second timing such that the third light and the fourth light have different polarization states;
the projection display system further comprises a light combining device for wavelength combining the first light and the second light at a first time sequence and polarization combining the third light and the fourth light at a second time sequence.
6. The projection display system of claim 2, further comprising a polarizing device disposed in a combined light path of the first illumination light and the second illumination light for converting the time-series outgoing first illumination light and second illumination light into linearly polarized illumination light;
a polarization conversion device is arranged on the first light channel or the second light channel and is used for carrying out polarization conversion on first light in the first light channel or second light in the second light channel at a first time sequence so that the first light and the second light have different polarization states, and/or a second time sequence is used for carrying out polarization conversion on third light in the first light channel or fourth light in the second light channel so that the third light and the fourth light have different polarization states;
the projection display system further comprises a light combining device, which is used for carrying out polarization light combining on the image light emitted by the light modulation device at the first time sequence and the second time sequence.
7. The projection display system of claim 3 wherein the first illumination light is broad spectrum light comprising red band light and green band light and the second illumination light is blue band light.
8. The projection display system of claim 2, wherein the illumination light or the second illumination light is linearly polarized light.
9. The projection display system of claim 2, wherein the light source comprises a first light source and a second light source, wherein the first light source comprises an excitation light source and a fluorescent color wheel, the excitation light source for emitting excitation light; the fluorescent color wheel is used for generating first illumination light under the excitation of the excitation light at a first time sequence;
the second light source is laser or LED light and is used for emitting second illumination at a second time sequence.
10. The projection display system of claim 9, wherein the light source further comprises a light combining and splitting element for directing the excitation light to the fluorescent color wheel and combining the first illumination light and the second illumination light.
11. A projection display system, comprising:
a light source for emitting illumination light;
the light energy balancing device is positioned in an emergent light path of the light source and is used for decomposing the illumination light into light beams transmitted along at least two light channels, and the light energy corresponding to the light beams of each light channel is balanced;
the optical modulation device comprises optical modulators correspondingly arranged on the optical channels, and each optical modulator is used for receiving the light beam on the corresponding optical channel and modulating the received light beam;
wherein the light energy balancing device comprises a polarization adjusting device and a light splitting device;
the polarization adjusting device is used for changing the polarization direction of the illumination light to make the component light beams formed in the S direction and the P direction be in a set proportion;
the beam splitting device is used for splitting 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, and the proportion is adjusted to balance the light energy of the component beam in the S direction and the light energy of the component beam in the P direction.
12. The projection display system of claim 11, wherein the display device further comprises a display device,
the light source is used for emitting first illumination light and second illumination light in a time sequence;
the polarization adjusting device is arranged in an emergent light path of the second illumination light and is used for changing the polarization direction of the second illumination light so that component beams formed in the S and P directions are in a set proportion;
the light splitting device is arranged in the first illumination light path, the second illumination light path and the light combining path, and is used for splitting the first illumination light wavelength into the first light and the second light at a first time sequence, and splitting the adjusted second illumination light polarization into a component light beam in the S direction transmitted by the first light channel and a light beam component in the P direction transmitted by the second light channel at a second time sequence;
wherein the light energy of the first light and the component light beam in the S direction in the first light channel is equalized with the light energy of the second light and the light beam component in the P direction in the second light channel.
13. The projection display system of claim 12 wherein the display device further comprises a display device,
the light source is used for emitting first illumination light and second illumination light in a time sequence;
the polarization adjusting device and the light splitting device are arranged in a light combining light path of the first illumination light and the second illumination light, and the polarization adjusting device does not work at the first time sequence.
14. The projection display system of any of claims 12-13, wherein the first illumination light is broad spectrum light comprising a first band of light and a second band of light, and the second illumination light is a third band of light.
15. The projection display system of any of claims 11-13, further comprising:
and the light combining device is positioned in an emergent light path of the modulated light emergent from the light modulating device and is used for carrying out polarization light combining on the modulated light emergent from each light modulator or carrying out wavelength light combining at a first time sequence and polarization light combining at a second time sequence.
16. The projection display system of claim 13, further comprising a polarizing device disposed in a combined light path of the first illumination light and the second illumination light for converting the time-sequentially exiting first illumination light and second illumination light into linearly polarized illumination light;
a polarization conversion device is arranged on the first light channel or the second light channel and is used for carrying out polarization conversion on first light in the first light channel or second light in the second light channel at a first time sequence so that the first light and the second light have different polarization states, and/or a second time sequence is used for carrying out polarization conversion on third light in the first light channel or fourth light in the second light channel so that the third light and the fourth light have different polarization states;
the projection display system further comprises a light combining device, which is used for carrying out polarization light combining on the image light emitted by the light modulation device at the first time sequence and the second time sequence.
17. The projection display system of claim 14 wherein the first illumination light is broad spectrum light comprising red band light and green band light and the second illumination light is blue band light.
18. The projection display system of any of claims 11-13, wherein the illumination light or the second illumination light is linearly polarized light.
19. The projection display system of claim 12 wherein the polarization adjustment means is a wave plate or a liquid crystal device.
CN202010395857.3A 2019-12-30 2020-07-02 Projection display system Active CN113126409B (en)

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