CN111385548B - Projection system and projection method - Google Patents
Projection system and projection method Download PDFInfo
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- CN111385548B CN111385548B CN201811643202.2A CN201811643202A CN111385548B CN 111385548 B CN111385548 B CN 111385548B CN 201811643202 A CN201811643202 A CN 201811643202A CN 111385548 B CN111385548 B CN 111385548B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
Abstract
The invention relates to a projection system and a projection method. The projection system includes: the image signal processing module is used for decomposing the input image signal into a low-frequency image signal and a high-frequency image signal according to a preset rule; the low-frequency image display module comprises a first light source, a scanning device and a scanning control unit, wherein the scanning control unit controls the brightness of the first light source and the position state of the scanning device according to a low-frequency image signal so as to scan at a preset position to form first image light; the high-frequency image display module comprises a second light source and a spatial light modulator, and the spatial light modulator modulates emergent light of the second light source according to the high-frequency image signal to form second image light; and the light combination module is used for combining the first image light and the second image light and outputting the combined light to the lens. The projection system and the projection method provided by the invention can improve the brightness and the resolution of the picture.
Description
Technical Field
The invention relates to the field of projection display, in particular to a projection system and a projection method.
Background
The current projection system basically utilizes a uniform illumination light source to illuminate a spatial light modulator, and a light valve array on the spatial light modulator controls the gray scale of each pixel of a display frame to output an image. However, the maximum optical power that the spatial light modulator can withstand limits the resolution and brightness of the output image. In general, obtaining higher brightness requires larger spatial light modulators to reduce power density. But the increased spatial light modulator increases the volume of the projection system and also increases the cost. In addition, some spatial light modulators use organic materials such as liquid crystal on silicon, which undergo decomposition or other reactions at high temperature and high optical power density, and thus suffer from limited optical power density.
In addition to the spatial light modulator, there are projection systems that dynamically change the direction of the laser beam by a scanning device (e.g., a galvanometer, a scanning mirror, etc.) so that the laser beam is scanned on a screen to form a picture. Such a projection system does not require a complicated optical element, has a simple structure, and has high light utilization efficiency, but cannot display a high-resolution image due to the limitation of the size of the light spot and the modulation speed of the light source. To achieve the mainstream resolution of the spatial light modulator, the collimation and the spot size of the light beam of the spatial light modulator need to be very small, the light beam quality of a common multimode laser cannot meet the requirement, and only a single-mode laser can be used, so that the output brightness and the resolution of the scanning type projection system are greatly limited.
Disclosure of Invention
In order to solve the technical problem that the output brightness and resolution of the existing projection system are limited, the invention provides a projection system capable of displaying high-brightness and high-resolution images, which comprises an image signal processing module, a low-frequency image signal and a high-frequency image signal, wherein the image signal processing module is used for decomposing an input image signal into the low-frequency image signal and the high-frequency image signal according to a preset rule; the low-frequency image display module comprises a first light source, a scanning device and a scanning control unit, wherein the scanning control unit controls the brightness of the first light source and the position state of the scanning device according to a low-frequency image signal so as to scan at a preset position to form first image light; the high-frequency image display module comprises a second light source and a spatial light modulator, and the spatial light modulator modulates emergent light of the second light source according to the high-frequency image signal to form second image light; and the light combination module is used for combining the first image light and the second image light and outputting the combined light to a lens.
In one embodiment, the light combining module is a polarization light combiner, and is configured to transmit incident light of a certain polarization state while reflecting incident light of another polarization state.
In one embodiment, the polarization states of the first image light and the second image light are perpendicular to each other.
In one embodiment, the deviation angle of the first image light is smaller than the light receiving angle of the lens, and the imaging size of the first image light on the lens is the same as the imaging size of the second image light on the lens.
In one embodiment, the preset positions are equal to the optical lengths between the lenses and between the spatial light modulator and the lenses.
In one embodiment, the first light source is a laser light source, and the second light source is any one of a laser light source, a laser fluorescent light source, an LED light source, and a bulb light source.
In one embodiment, the preset rule is: the image frequency in the image signal is less than or equal to fcIs extracted as the low-frequency image signal, is larger than fcIs extracted as the high-frequency image signal; f. ofc＝f*(rs/ro) Where f is the maximum frequency of the input image, roFor original image resolution, rsThe resolution corresponding to the first image light.
The invention also provides a projection method suitable for the projection system, which comprises the following steps: decomposing an input image signal into a low-frequency image signal and a high-frequency image signal by adopting an image signal processing module; transmitting the low-frequency image signal to a scanning control unit of a low-frequency image display module to control the brightness of a first light source and the position state of a scanning device, so as to scan and form first image light at a preset position, and simultaneously transmitting the high-frequency image signal to a spatial light modulator of a high-frequency image display module to modulate emergent light of a second light source to form second image light; and combining the first image light and the second image light by adopting a light combining module and outputting the combined light to a lens.
In one embodiment, the decomposing the input image signal into the low frequency image signal and the high frequency image signal using the image signal processing module includes the steps of: inputting an image; etching the RGB channel; according to a predetermined cut-off frequency fcCarrying out low-frequency filtering on the corroded image; setting the image frequency less than or equal to fcThe low-frequency image signal is obtained according to the maximum brightness truncation negative value and the highlight overflow which are scanned and displayed in the low-frequency image display module, and the low-frequency image signal is output to the low-frequency image display module; the image frequency is greater than fcAccording to the maximum brightness that can be output by the spatial light modulatorAnd obtaining the high-frequency image signal by a degree truncation negative value and a highlight overflow, and outputting the high-frequency image signal to the high-frequency image display module.
In one embodiment, the cut-off frequency f used for low-frequency filtering of the eroded imagecThe following formula is satisfied: f. ofc＝f*(rs/ro) Where f is the maximum frequency of the input image, roFor original image resolution, rsThe resolution corresponding to the first image light.
The projection system provided by the invention decomposes an input image into a low-frequency image signal and a high-frequency image signal through the image signal processing module, adopts the scanning type low-frequency image display module to modulate and form first image light according to the low-frequency image signal, adopts the spatial light modulator as the high-frequency image display module to modulate and form second image light according to the high-frequency image signal, and finally superposes the first image light and the second image light to restore an original image. Compared with the prior art, the invention combines the scanning type projection display with the projection display based on the spatial light modulator, relatively reduces the luminous flux incident to the spatial light modulator, thereby prolonging the service life of the spatial light modulator.
Drawings
Fig. 1 is a schematic block diagram of a projection system provided by the present invention.
FIG. 2 is a schematic view of a projection system according to a preferred embodiment of the invention.
FIG. 3 is a schematic view of a projection system according to another preferred embodiment of the present invention.
Fig. 4 is a flowchart of a projection method provided by the present invention.
Fig. 5 is a flowchart of the image signal processing module decomposing an input image in the projection method shown in fig. 4.
Description of the main elements
Low frequency image display module 110, 210
High frequency image display module 120, 220
Relay lens 1232
Mirror 2231
Image signal processing modules 130, 230
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic block diagram of a projection system 100 according to the present invention. The projection system 100 includes a low frequency image display module 110, a high frequency image display module 120, an image signal processing module 130, a light combining module 140, and a lens 150. The image signal processing module 130 can decompose the input image signal into a low-frequency image signal and a high-frequency image signal according to a preset rule, and transmit the low-frequency image signal to the low-frequency image display module 110 and the high-frequency image signal to the high-frequency image display module 120. The low-frequency image display module 110 combines the first image light obtained according to the low-frequency image signal and the second image light obtained according to the high-frequency image signal by the high-frequency image display module 120, and then the combined light enters the lens 150.
Specifically, the preset rule is as follows: the image frequency in the image signal is less than or equal to fcIs extracted as a low-frequency image signal, greater than fcIs extracted as a high-frequency image signal, wherein fcThe following formula is satisfied as the cutoff frequency: f. ofc＝f*(rs/ro) F is the maximum frequency of the input image, roFor original image resolution, rsThe resolution corresponding to the first image light.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a projection system 100 according to a preferred embodiment of the invention. In this embodiment, the low frequency image display module 110 includes a first light source 111, a scanning device 112, a virtual image plane 113, and a scan control unit 114. The scanning device 112 is disposed in an optical path between the first light source 111 and the virtual image plane 113, and the first light source 111 and the scanning device 112 are respectively connected to the scan control unit 114 and controlled by the scan control unit 114.
The low frequency image display module 110 operates on the principle that: the scan control unit 114 controls the brightness of the first light source 111 and the position state of the scanning device 112 according to the low-frequency image signal, thereby scanning and forming the first image light at a preset position. Specifically, the emergent light of the first light source 111 is scanned by the scanning device 112 on the virtual imaging surface 113 to form a virtual image, and the scan control unit 114 calculates the real-time position of the incident light spot according to the position state of the scanning device 112 and controls the brightness of the first light source 111 according to the real-time position of the incident light spot to generate a light and shade distribution image on the virtual imaging surface 113.
In the present embodiment, the first light source 111 includes a plurality of types of monochromatic light sources, preferably RGB laser light, and emits polarized light with good collimation. In other embodiments, the first light source 111 is not limited to be polarized light, and the low frequency image display module 110 further includes a first polarizer to change a polarization state of the outgoing light from the first light source 111, so that the first image light is polarized light with a certain polarization state.
The scanning device 112 is a high-speed scanning device, such as a galvanometer, a scanning mirror, etc., and can periodically and rapidly change the direction of incident light, so that the emergent light of the first light source 111 can be rapidly scanned at the virtual image plane 113.
In this embodiment, the high-frequency image display module 120 includes a second light source 121, a second polarizer 122, a light collection and guide device 123, and a spatial light modulator 124. The second polarizer 122 and the light collecting and directing means 123 are disposed in the optical path between the second light source 121 and the spatial light modulator 124. The high frequency image display module 120 operates on the principle that: the outgoing light of the second light source 121 is converted into polarized light by the second polarizer 122 and guided by the light collection and guiding device 123 into the spatial light modulator 124 for modulation.
Specifically, the second light source 121 is a uniform illumination light source, and may be any one of a laser-fluorescent mixed light source, a bulb light source, and an LED light source. In this embodiment, the second light source 121 is a laser-fluorescence mixed light source, which includes a laser 1211 and a wavelength conversion device 1212, it can be understood that the laser 1211 can generate excitation light, such as blue laser, the excitation light generated by the laser 1211 is incident on the wavelength conversion device 1212 to generate fluorescence, such as red fluorescence and green fluorescence, by exciting phosphor, and the emergent light of the wavelength conversion device 1212 is a mixed light of laser light and fluorescence emitted in time sequence.
In this embodiment, the light collection and guide device 123 includes a condenser lens 1231 and a relay lens 1232, wherein the condenser lens 1231 is used for collecting the light emitted from the second light source 121, and is necessary when the second light source 121 is a large-angle light source. The relay lens 1232 is used to relay the exit light of the second light source 121 into the spatial light modulator 124.
In this embodiment, the spatial light modulator 124 is specifically an LCOS spatial light modulator, and the light combining module 140 is specifically a polarization light combiner, which can transmit incident light of a certain polarization state and reflect incident light of another polarization state. The second light source 121 and the LCOS spatial light modulator are located at two opposite sides of the polarization beam combiner, and the emergent light of the second light source 121 is converted into polarized light capable of being transmitted by the polarization beam combiner through the second polarizer 122, and then is modulated and rotated by the LCOS spatial light modulator to form polarized light capable of being reflected by the polarization beam combiner.
Since the light emitted from the first light source 111 is polarized light that can be transmitted by the polarization beam combiner, the image light scanned on the virtual image plane 113 by the scanning device 112 from the light emitted from the first light source 111 can also be transmitted by the polarization beam combiner. Therefore, in this embodiment, the first image light modulated by the low frequency image display module 110 and the second image light modulated by the high frequency image display module 120 are transmitted and reflected by the polarization beam combiner, and then the combined light enters the lens 150.
In order to make the first image light generated by the low frequency image display module 110 and the second image light generated by the high frequency image display module 120 completely coincide with each other, the light deflection amplitude of the scanning device 112 is adjusted to make the deviation angle of the first image light smaller than the light receiving angle of the lens 150, so that the imaging size of the first image light on the lens 150 is the same as the imaging size of the second image light on the lens. Further, the optical paths between the virtual imaging plane 113 and the lens 150 and between the spatial light modulator 124 and the lens 150 are equal. It should be noted that "equal" may be mathematically equal, or may have a certain slight difference, so that the first image light and the second image light can be ignored by the persistence of vision effect of human eyes when they are combined on the screen.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a projection system 200 according to another preferred embodiment of the invention. The projection system 200 of the present embodiment is substantially the same as the projection system 100 of the previous embodiment, and includes a low-frequency image display module 210, a high-frequency image display module 220, an image signal processing module 230, a light combining module 240, and a lens 250. The low-frequency image display module 210 also includes a first light source 211, a scanning device 212, a virtual image plane 213, and a scan control unit 214. The high frequency image display module 220 also comprises a second light source 221, a second polarizer 222, a light collecting and directing means 223 and a spatial light modulator 224. The light combining module 240 is also a polarization light combiner, and is configured to transmit incident light of a certain polarization state and reflect incident light of another polarization state, where the emergent light of the first light source 211 is polarized light that can be transmitted by the polarization light combiner 241.
The projection system 200 in the present embodiment is different from the projection system 100 in the previous embodiment in that: the spatial light modulator 224 is specifically a DMD modulator, the second light source 221 and the DMD modulator are located on the same side of the polarization combiner, and the emergent light of the second light source 221 is converted into polarized light with a polarization state perpendicular to that of the first light source 211 through the second polarizer 222.
Therefore, the image light emitted after being modulated by the low-frequency image display module 210 and the image light emitted after being modulated by the high-frequency image display module 220 are transmitted and reflected by the polarization beam combiner 241, respectively, and then are combined into a light beam entering the lens 250.
The projection system 200 in the present embodiment is also different from the projection system 100 in the previous embodiment in that: the light collection and guide device 223 includes a reflector 2231 and a TIR prism 2232, and the outgoing light from the second light source 221 enters the DMD modulator after passing through the reflector 2231 and the TIR prism 2232.
In addition, the spatial light modulator 224 may also employ an LCD panel.
Referring to fig. 4, fig. 4 is a flowchart of a projection method according to the present invention. The present invention further provides a projection method suitable for the projection system 100(200) in any of the above embodiments, including the following steps:
s10: the image signal processing module 130(230) is used to decompose the input image into a low frequency image signal and a high frequency image signal;
s20: the low-frequency image signal is transmitted to the scan control unit 114(214) of the low-frequency image display module 110(210) to control the brightness of the first light source 111(211) and the position state of the scanning device, so as to scan and form the first image light at a preset position, and at the same time, the high-frequency image signal is transmitted to the spatial light modulator 124(224) of the high-frequency image display module 120(220) to modulate the emergent light of the second light source 121(221) to form the second image light;
s30: the light combining module 140(240) combines the first image light and the second image light and outputs the combined light to the lens 150 (250).
It should be noted that the frequency of the image reflects how fast the image pixels change, that is, if the image pixels of a certain region change very much, the region carries certain high-frequency information. The more high frequency information of the image, the more detail features the image carries, and the high resolution spatial light modulator 124(224) is required for display.
In addition, the scanning device with lower resolution is adopted as the low-frequency image display module, so that the low-frequency image display module is easier to realize.
Referring to fig. 5, fig. 5 is a flowchart illustrating the image signal processing module 130(230) decomposing the input image signal in the projection method shown in fig. 4. The process of splitting the input image into the low-frequency image signal and the high-frequency image signal by the image signal processing module 130(230) is as follows:
s101: inputting an image;
s102: etching the RGB channel to reduce the highlight area of the picture;
s103: according to a predetermined cut-off frequency fcLow frequency filtering the eroded image, wherein the cut-off frequency fcThe following formula is satisfied: f. ofc＝f*(rs/ro) F is the maximum frequency of the input image, roFor original image resolution, rsA resolution corresponding to the first image light;
s104: setting the image frequency less than or equal to fcA scan control unit 114(214) for performing truncation negative values and highlight overflow, and outputting low-frequency image signals to the low-frequency image display module 110 (210);
s105: the image frequency is greater than fcAnd blooming, and outputs the high frequency image signal to the spatial light modulator 124(224) of the high frequency image display module 120 (220).
Specifically, in step S104, according to the maximum brightness scanned and displayed in the low-frequency image display module 110(210), the pixels exceeding the maximum brightness and the negative value are cut off so as not to exceed the dynamic range of the scanned and displayed image. In step S105, the pixels exceeding the maximum brightness and the negative value are cut off according to the maximum brightness that can be output by the spatial light modulator 124 (224). Step S104 and step S105 may be performed simultaneously.
In one embodiment, the polarizer is used to make the polarization state of the first image light formed by scanning at the preset position different from the polarization state of the second image light formed by modulating by the spatial light modulator 124(224), and the polarization light combiner of the light combining module 140(240) combines the first image light and the second image light by transmission and reflection, respectively. Preferably, the polarizer is used to make the polarization state of the first image light formed at the preset position perpendicular to the polarization state of the second image light modulated by the spatial light modulator 124 (224).
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A projection system, comprising:
the image signal processing module is used for decomposing the input image signal into a low-frequency image signal and a high-frequency image signal according to a preset rule;
the low-frequency image display module comprises a first light source, a scanning device and a scanning control unit, wherein the scanning control unit controls the brightness of the first light source and the position state of the scanning device according to a low-frequency image signal so as to scan at a preset position to form first image light;
the high-frequency image display module comprises a second light source and a spatial light modulator, and the spatial light modulator modulates emergent light of the second light source according to the high-frequency image signal to form second image light; and
and the light combination module is used for combining the first image light and the second image light and outputting the combined light to a lens so as to form the same image.
2. The projection system of claim 1, wherein the light combining module is a polarization light combiner for transmitting incident light of one polarization state and reflecting incident light of another polarization state.
3. The projection system of claim 2, wherein the first image light and the second image light have polarization states that are perpendicular to each other.
4. The projection system of claim 1, wherein the deviation angle of the first image light is smaller than the light receiving angle of the lens, and the image of the first image light on the lens has the same size as the image of the second image light on the lens.
5. The projection system of claim 1, wherein the predetermined position is equal to the optical path length between the lens and between the spatial light modulator and the lens.
6. The projection system of claim 1, wherein the first light source is a laser light source, and the second light source is any one of a laser light source, a laser fluorescent light source, an LED light source, and a bulb light source.
7. The projection system of claim 1, wherein the predetermined rule is: extracting a signal with an image frequency of fc less than or equal to fc in the image signals as the low-frequency image signal, and extracting a signal with an image frequency of fc greater than fc as the high-frequency image signal; and fc ═ f (rs/ro), wherein f is the maximum frequency of the input image, ro is the resolution of the original image, and rs is the resolution corresponding to the first image light.
8. A method of projection comprising the steps of:
decomposing an input image signal into a low-frequency image signal and a high-frequency image signal by adopting an image signal processing module;
transmitting the low-frequency image signal to a scanning control unit of a low-frequency image display module to control the brightness of a first light source and the position state of a scanning device, so as to scan and form first image light at a preset position, and simultaneously transmitting the high-frequency image signal to a spatial light modulator of a high-frequency image display module to modulate emergent light of a second light source to form second image light; and
and combining the first image light and the second image light by adopting a light combining module and outputting the combined light to a lens to form the same image.
9. The projection method of claim 8, wherein the decomposing the input image signal into the low frequency image signal and the high frequency image signal using the image signal processing module comprises the steps of:
inputting an image;
etching the RGB channel;
carrying out low-frequency filtering on the corroded image according to a preset cut-off frequency fc;
obtaining the low-frequency image signal by the signal with the image frequency less than or equal to fc according to the maximum brightness truncation negative value and the highlight overflow displayed in the low-frequency image display module, and outputting the low-frequency image signal to the low-frequency image display module;
and obtaining the high-frequency image signal by the signal with the image frequency larger than fc according to the maximum brightness truncation negative value and the highlight overflow which can be output by the spatial light modulator, and outputting the high-frequency image signal to the high-frequency image display module.
10. The projection method according to claim 9, wherein the cut-off frequency fc used for low-frequency filtering of the eroded image satisfies the following formula: and fc ═ f (rs/ro), wherein f is the maximum frequency of the input image, ro is the resolution of the original image, and rs is the resolution corresponding to the first image light.
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| CN201811643202.2A CN111385548B (en) | 2018-12-29 | 2018-12-29 | Projection system and projection method |
| PCT/CN2019/127277 WO2020135298A1 (en) | 2018-12-29 | 2019-12-23 | Projection system and projection method |
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| JP2004128149A (en) * | 2002-10-01 | 2004-04-22 | Nikon Corp | Aberration measuring method, exposure method and aligner |
| CN101315465A (en) * | 2007-05-29 | 2008-12-03 | 三星电子株式会社 | Projector |
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