WO2020135294A1 - 一种显示系统 - Google Patents

一种显示系统 Download PDF

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Publication number
WO2020135294A1
WO2020135294A1 PCT/CN2019/127269 CN2019127269W WO2020135294A1 WO 2020135294 A1 WO2020135294 A1 WO 2020135294A1 CN 2019127269 W CN2019127269 W CN 2019127269W WO 2020135294 A1 WO2020135294 A1 WO 2020135294A1
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Prior art keywords
image
light source
signal
light
brightness
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Ceased
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PCT/CN2019/127269
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English (en)
French (fr)
Inventor
胡飞
余新
吴超
徐梦梦
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Priority to US17/418,531 priority Critical patent/US11399162B2/en
Publication of WO2020135294A1 publication Critical patent/WO2020135294A1/zh
Anticipated expiration legal-status Critical
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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]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • 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
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
    • 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
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
    • 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
    • G03B21/142—Adjusting of projection optics
    • 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
    • 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
    • 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]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/312—Driving therefor
    • 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]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • 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]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • H04N9/3135—Driving therefor
    • 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
    • H04N9/315—Modulator illumination systems
    • H04N9/3152—Modulator illumination systems for shaping the light beam
    • 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
    • H04N9/315—Modulator illumination systems
    • H04N9/3155—Modulator illumination systems for controlling the light source
    • 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
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources
    • 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
    • H04N9/315—Modulator illumination systems
    • H04N9/3164—Modulator illumination systems using multiple light sources
    • 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
    • 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]
    • H04N9/3197—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using light modulating optical valves

Definitions

  • the invention relates to the field of display technology, in particular to a display system.
  • Existing projection display systems in the form of beam scanning use laser light to have better directivity, dynamically change the direction of the laser beam through the scanning device, and form a picture on the screen.
  • This technology can greatly simplify the structure of the optical path, but it requires high beam collimation, and in order to achieve high resolution, the spot size needs to be very small.
  • Single-mode lasers enable beams and spots to achieve these characteristics, but single-mode lasers limit the output brightness of projection display systems in the form of beam scanning.
  • Multimode lasers can improve the output brightness of scanning projection equipment, but even if optical shaping devices are added to the light path of the light source and the scanner, beam collimation and spot size are difficult to reach the mainstream resolution of current spatial light modulators. Therefore, for existing projection display systems in the form of beam scanning, high brightness and high resolution cannot be achieved at the same time.
  • the invention provides a display system, which can solve the problem that the brightness and resolution of the projection system in the existing beam scanning form cannot be obtained at the same time.
  • a technical solution adopted by the present invention is to provide a display system including a light source system for emitting a light beam; a scanner for scanning the light beam emitted by the light source system on the surface of a spatial light modulator in the form of a light spot.
  • the light spot corresponds to a plurality of pixels of the spatial light modulator; the spatial light modulator modulates the light spot projected on the scanner by the image modulation signal of the processing and control system to output image light ; the control and processing system, an image signal input, the output timing of the light source modulation signal i n (t) according to the light source modulating means, and outputs the modulated signal to the image spatial light modulator; modulating said light source means, the brightness of the light source for outputting a timing signal modulated i n (t), adjusting the light source system.
  • the processing and control system is used to divide the image into multiple sub-image regions along the spot scanning direction according to the input image signal, and obtain the edge along the maximum pixel brightness of each sub-image region.
  • the processing and control system is used to divide the image into multiple sub-image regions along the spot scanning direction according to the input image signal, and obtain the edge along the maximum pixel brightness of each sub-image region.
  • the processing and control system is used to divide the image into multiple sub-image regions along the spot scanning direction according to the input image signal, and obtain the maximum pixel brightness of each sub-image region to obtain the image luminance signal amplitude L in (t) of each of said sub-image region in the light spot scanning direction, the image brightness amplitude signal L in (t) and the luminance distribution of the light spot L gn (t) for rewind
  • the processing and control system is used to divide the image into multiple sub-image regions along the spot scanning direction according to the input image signal, and obtain the maximum pixel brightness of each sub-image region to obtain the image luminance signal amplitude L in (t) of each of said sub-image region in the light spot scanning direction, the image brightness amplitude signal L in (t) and the luminance distribution of the light spot L gn (t) for rewind
  • the product operation obtains the light source brightness amplitude signal L s1n (t), and the light source brightness amplitude signal L s1n (t) passes through a low-pass filter to obtain the light source brightness amplitude signal L s2n (t).
  • the cut-off frequency of the low-pass filter is not less than the current modulation bandwidth of the light source system.
  • the length of the light spot in the scanning direction corresponds to less than 2 pixels of the spatial light modulator.
  • the size of the sub-image area is the same as the number of spatial light modulator pixels corresponding to the spot size.
  • the processing and control system outputs the image modulation signal to the spatial light modulator. After a preset time interval, the processing and control system outputs a synchronization signal to the scanner. After receiving the synchronization signal, the scanner directs the light beam to the initial scanning position on the surface of the spatial light modulator. Therefore, the problem of image distortion caused by the scanner already starting to scan on the surface of the spatial light modulator when the deflection of the spatial light modulator is not completed can be avoided.
  • the processing and control system outputs a synchronization signal to the scanner, and after the scanner receives the synchronization signal, Direct the light beam to the initial scanning position on the surface of the spatial light modulator.
  • the spatial light modulator is a transmissive liquid crystal light valve or a reflective liquid crystal light valve.
  • it further includes: an optical shaping device, which is disposed on the optical path between the light source system and the scanner, and is used to guide the light beam emitted by the light source system to the scanner.
  • it further includes: a flat field focusing lens, which is disposed on the optical path between the scanner and the spatial light modulator, and is used to linearly scan the deflected beam output by the scanner to the Spatial light modulator.
  • a flat field focusing lens which is disposed on the optical path between the scanner and the spatial light modulator, and is used to linearly scan the deflected beam output by the scanner to the Spatial light modulator.
  • the present invention provides a display system including a light source system, a scanner, a spatial light modulator, a processing and control system, and a light source modulation device.
  • a display system including a light source system, a scanner, a spatial light modulator, a processing and control system, and a light source modulation device.
  • the sharpness of image modulation is mainly given to the spatial light modulator to solve, reducing the size of the scanning spot
  • the requirements of precision and accuracy make the light source no longer limited to single-mode lasers, which solves the problem that the projection system of the current beam scanning form cannot have both high brightness and high resolution.
  • combining the input image signal at the same time The brightness of the light spot and the spatial light modulator are modulated to achieve a higher dynamic range image display.
  • FIG. 1 is a schematic structural diagram of a display system provided by Embodiments 1 to 4 of the present invention.
  • Embodiment 2 is an example of a timing adjustment manner of a light source system of a display system according to Embodiment 1 of the present invention
  • Embodiment 4 of the present invention is a flowchart of a current modulation algorithm of a display system provided by Embodiment 4 of the present invention.
  • FIG. 4 is a schematic structural diagram of a display system according to Embodiments 5-6 of the present invention.
  • FIG. 5 is a schematic structural diagram of a display system according to Embodiment 7 of the present invention.
  • Embodiment 6 is an example of a timing adjustment manner of a light source system of a display system according to Embodiment 7 of the present invention.
  • FIG. 7 is a schematic structural diagram of a display system according to Embodiment 8 of the present invention.
  • Embodiment 8 is an example of a timing adjustment manner of a light source system of a display system according to Embodiment 8 of the present invention.
  • FIG. 1 is a schematic structural diagram of a display system according to Embodiment 1 of the present invention.
  • the display system 10 of the present invention includes a light source system 11, a scanner 12, a spatial light modulator 13, a processing and control system 14, and a light source modulation device 15.
  • the light source system 11 emits a light beam, which is scanned by the scanner 12 on the surface of the spatial light modulator 13 in the form of a light spot, and then, the image light modulated by the spatial light modulator 13 is projected to form a display image (not shown in the figure) Out).
  • Processing and control system 14 the spatial light modulator according to an input image signal, the output timing of the light source modulation signal i n (t) modulation to the light source apparatus 15, a modulation signal 13 and outputs an image.
  • the spatial light modulator 13 to scan the image modulated signal light spot on the surface thereof is modulated, the light source apparatus 15 according to the modulation timing of the light source modulation signal i n (t), adjust the output brightness of the light source system 11.
  • the light source system 11 is used to emit a light beam.
  • the light source system 11 is a laser light source system.
  • the light source system 11 is a red, green, and blue laser light source with timing adjustment, where 11a is a red laser light source, 11b is a green laser light source, and 11c is a blue laser light source.
  • FIG. 2 is an example of the timing adjustment method of the light source system 11.
  • the red laser light source 11a when the red laser light source 11a is turned on, the green laser light source 11b and the blue laser light source 11c are turned off; when the green laser light source 11b is turned on, the red laser light source 11a and the blue laser light source 11c are turned off; when the blue laser light source 11c is turned on, The red laser light source 11a and the green laser light source 11b are turned off.
  • the scanner 12 is used to scan the light beam emitted by the light source system 11 on the surface of the spatial light modulator 13 in the form of a light spot, and the light spot corresponds to a plurality of pixels of the spatial light modulator 13.
  • the spot shape is rectangular.
  • the number of pixels of the spatial light modulator 13 is 1920 ⁇ 1080
  • the light spot may be a rectangular light spot including 1 ⁇ 108 pixels
  • the light spot may be a rectangular light spot including 10 ⁇ 10 pixels.
  • the examples are for illustrative purposes only, and the present invention does not limit the specific numerical value of the spot size.
  • the scanner 12 may be a two-dimensional scanning mirror, two one-dimensional scanning mirrors cascaded two-dimensional scanning mirror, rotating polygon mirror, rotating scanning mirror, MEMS (Micro-Electro-Mechanical System) vibrating mirror, electro-optic crystal, acousto-optic Crystal, optical phased array, liquid crystal light deflection device, optical fiber scanning device using resonance, etc.
  • MEMS Micro-Electro-Mechanical System
  • the spatial light modulator 13 is a transmissive liquid crystal light valve or a reflective liquid crystal light valve.
  • This type of spatial light modulator is an "analog device".
  • the size of the sub-image area is the same as the number of pixels of the spatial light modulator 13 corresponding to the spot size.
  • the light spot is a rectangular light spot including 1 ⁇ 108 pixels, and the sub-pixel area includes 1 ⁇ 108 pixels.
  • the processing and control system 14 predicts the light and dark distribution of the surface of the spatial light modulator 13 after scanning the spatial light modulator 13 for each color subframe spot according to the output brightness of the light source system 11 and the red, green, and blue image signals
  • the image modulation signal is output to the spatial light modulator 13.
  • the spatial light modulator 13 performs a deflection operation based on the input image modulation signal.
  • the processing and control system 14 splits the image signal into corresponding red, green, and blue image signals according to the input image signal, and a frame corresponding to the image signal is split into three colors of red, green, and blue.
  • Subframe image Assuming that each frame image has 1920 ⁇ 1080 pixels, then in the red, green, and blue color subframe images, each color subframe image also has 1920 ⁇ 1080 pixels. If the sub-image area is 1 ⁇ 108 pixels, then each color sub-frame contains 19200 sub-areas. According to the scanning direction of the light spot and the maximum pixel brightness of each sub-area, the image brightness amplitude signal L in that changes with the scanning time can be obtained (t).
  • the image brightness amplitude signal corresponding to the red subframe is L iR (t)
  • the signal i R (t) controls the light source modulation device 15 to adjust the output brightness of the red laser light source 11a.
  • the greater the input current of the light source system the greater the corresponding brightness;
  • the relationship between the brightness of the light source system and the current of the light source can be obtained by query.
  • the output brightness adjustment method of the blue laser light source in the blue subframe and the output brightness adjustment method of the green laser light source in the green subframe are similar to the output brightness adjustment method of the red laser light source described above, and therefore will not be described in detail.
  • an optical shaping device 16 and a flat field focusing lens 17 may also be included.
  • the optical shaping device 16 is disposed on the optical path between the light source system 11 and the scanner 13 to shape the light beam emitted by the light source system 11 to obtain a uniform beam with a small divergence angle and guide the light beam to the scanner 12 .
  • the optical shaping device 16 may be an optical device such as a square rod or a compound eye lens.
  • the flat field focusing lens 17 is disposed on the optical path between the scanner 12 and the spatial light modulator 13 and is used to linearly scan the deflected light beam output by the scanner 12 to the spatial light modulator 13. In this way, the scanner 12 performs linear scanning at a uniform speed on the surface of the spatial light modulator 13 in the form of light spots.
  • the optical shaping device 16 and the flat field focusing lens 17 are not essential devices, and may be omitted.
  • the modulation bandwidth of some light sources is not large enough.
  • the light source cannot meet the modulation requirements, so the light source brightness amplitude signal may be partially lower than the image brightness amplitude signal And make the image distorted.
  • the light source brightness adjustment cannot be quickly tracked in the area where the image brightness amplitude signal changes suddenly (generally the high frequency area of the image), which means that the image In the area where the brightness amplitude signal rises sharply, the output brightness of the light source cannot immediately rise to the required value of the image brightness amplitude signal; while in the sudden fall area, it cannot be accurately reduced to the required value of the image brightness amplitude signal.
  • the processing and control system 14 divides the image into a plurality of sub-image regions along the spot scanning direction according to the input image signal, and obtains each of the sub-regions along the spot scanning direction according to the maximum pixel brightness of each sub-image region the image luminance signal amplitude L in (t) of the image area, the amplitude of the luminance image signals L in (t) obtained through the low-pass filter luminance magnitude signal light L s2n (t).
  • the cut-off frequency of the low-pass filter is not less than the current modulation bandwidth of the light source system.
  • This operation aims to determine the amplitude of the image signal of the luminance L in (t) of the modulated high-frequency region, i.e., the amplitude of the luminance image signals L in (t) is higher than the frequency bandwidth of the source current modulation system area.
  • the greater the input current of the light source system the greater the corresponding brightness;
  • the relationship between the brightness of the light source system and the current of the light source can be obtained by query.
  • the precise adjustment of the image by the spatial light modulator can only be performed by "dimming" the spot on the surface. Therefore, for the latter, that is, the case where the output brightness of the light source is higher than the required value of the image brightness amplitude signal, the space Light modulator modulation can restore the brightness of the image; for the case where the output brightness of the light source is lower than the required value of the image brightness amplitude signal, even if it is further modulated by the spatial light modulator, the image brightness cannot be increased, resulting in image distortion.
  • the present invention locally adjusts the light source brightness amplitude signal L s2n (t) to increase the value of the light source brightness amplitude signal, for example, when the light source brightness amplitude signal L s2n (t) is lower than the image brightness amplitude signal In the area of L in (t), add a value to the light source brightness amplitude signal L s2n (t), the value is based on the difference between the light source brightness amplitude signal L s2n (t) and the image brightness amplitude signal L in (t) It is determined that within a frame of the image, the locally adjusted light source brightness amplitude signal L s3n (t) is always not less than the image brightness amplitude signal L in (t). It can be understood that, for the sake of simple calculation, the light source brightness amplitude signal of the entire frame of image can also be adjusted up to meet the accurate display in the high brightness area of the image.
  • Embodiment 2 compared with Embodiment 1, the calculation operation of low-pass filtering and local adjustment is added to solve the problem that due to the narrow modulation bandwidth of the light source, the speed of the brightness adjustment of the light source does not meet the requirements, and the amplitude signal of the light source is partially lower than the image The problem of image distortion caused by the brightness amplitude signal.
  • the light spot scanned on the surface of the spatial light modulator is a light spot with a uniform distribution.
  • the volume and light uniformity of the light homogenizing device it is difficult to achieve a completely uniform light spot under a small optical path size, that is, there may be uneven brightness distribution of the light spot, especially when the light homogenizing device is omitted
  • the brightness distribution of the laser spot is usually Gaussian distribution.
  • the default light spot is uniformly distributed, a high-reduced image display cannot be obtained.
  • the case where the brightness distribution of such a spot itself is uneven is called uneven brightness distribution within the spot.
  • the brightness of the light spot on the surface of the spatial light modulator will change with time, resulting in uneven light distribution in the sub-image area, then the image modulation for each sub-image area will have to consider time
  • the brightness distribution of the spot after superposition such a situation that the light distribution in the sub-image area caused by the change in the spot brightness with time is called unevenness in the sub-image area brightness distribution.
  • Embodiment 3 performs deconvolution operations on the image brightness amplitude signal and the light spot brightness distribution on the basis of Embodiment 1.
  • the present embodiment as compared with Example 1, the luminance of the image signal amplitude L in (t) and the luminance distribution of the light spot L gn (t) inverse convolution operation obtained amplitude signal source luminance L s1n (t) At the same time, it solves the problems of uneven brightness distribution inside the light spot and uneven brightness distribution in the sub-image area.
  • the preferred spot size is a spot with a width of one pixel in the scanning direction. For example, if the spot is a rectangular beam 1 ⁇ 108 pixels or rectangular beam 1 ⁇ 10 pixels, the image brightness amplitude signal L in (t) and the luminance distribution of the light spot L gn (t) The calculation process of performing the deconvolution operation to obtain the light source brightness amplitude signal L s1n (t) can be simplified.
  • Embodiment 3 of the present invention on the basis of adopting a spot size that is one pixel wide along the scanning direction, the longitudinal distribution of the spot is comprehensively considered to simultaneously solve the uneven brightness distribution inside the spot and the sub-image The problem of uneven distribution of regional brightness.
  • the processing and control 14 system predicts that after scanning the spatial light modulator 13 for each color subframe spot according to the longitudinal distribution of the light spot (distribution perpendicular to the scanning direction) and the output brightness of the light source system 11, the surface of the spatial light modulator 13 The distribution of light and dark is compared with the red, green, and blue image signals, and the image modulation signal is output to the spatial light modulator 13.
  • the spatial light modulator 13 performs a deflection operation based on the input image modulation signal.
  • Embodiment 3 is similar to Embodiment 1. There may also be a case where the brightness modulation speed of the light source system is limited by the modulation bandwidth of the light source, so that the light source brightness amplitude signal is locally lower than the image brightness amplitude signal and the image is distorted.
  • Embodiment of the present invention 4 Perform low-pass filtering on the image brightness amplitude signal obtained after the deconvolution operation in Embodiment 3, and then perform local adjustment to solve this problem.
  • the current modulation algorithm may include steps S1-S6.
  • Step S1 According to the input image signal, the image is divided into a plurality of sub-image regions along the spot scanning direction.
  • Step S2 The maximum luminance of each sub-pixel image region to obtain the image signal of each luminance magnitude of the sub-image region in the light spot scanning direction L in (t).
  • Step S3 the amplitude of the luminance signal luminance image L in (t) and the distribution of the light spot L gn (t) inverse convolution operation obtained amplitude signal source luminance L s1n (t).
  • Step S4 Pass the light source brightness amplitude signal L s1n (t) through a low-pass filter to obtain a filtered light source brightness amplitude signal L s2n (t).
  • Step S5 Locally adjust the light source brightness amplitude signal L s2n (t), so that in each frame of the image, the light source brightness amplitude signal L s3n (t) is always not less than the image brightness amplitude signal L in (t ).
  • the processing and control system 14 splits the image signal into corresponding red, green and blue image signals according to the input image signal, and a frame corresponding to the image signal is split into three colors of red, green and blue Subframe.
  • each color subframe takes the modulation of the output brightness of the red laser light source in the red subframe as an example. Assuming that each frame of image has 1920 ⁇ 1080 pixels, then in the three color subframes of red, green, and blue, each color subframe also has 1920 ⁇ 1080 pixels. If the sub-image area is 2 ⁇ 108 pixels, then each color sub-frame contains 9600 sub-areas.
  • the image brightness amplitude signal L iR that changes with the scanning time can be obtained (t), where the image brightness amplitude signal corresponding to the red subframe is L iR (t), and the deconvolution operation is performed on L iR (t) and the corresponding red spot brightness distribution L gR (t) to obtain the red light source brightness amplitude
  • the signal L s1R (t) after passing through the low-pass filter, obtains the red light source brightness amplitude signal L s2R (t), and the filtered waveform is locally adjusted so that the red light source brightness amplitude signal L during the red subframe time s3R (t) is always not less than the red image brightness amplitude signal L iR (t).
  • the output brightness adjustment method of the blue laser light source in the blue subframe and the output brightness adjustment method of the green laser light source in the green subframe are similar to the output brightness adjustment method of the red laser light source described above, and therefore will not be repeated.
  • this embodiment can solve the uneven brightness distribution inside the light spot and the uneven brightness distribution in the sub-image area through deconvolution operation, and increase the calculation operations of low-pass filtering and local adjustment to solve the problem of light source
  • the modulation bandwidth is narrow, and the speed of adjusting the brightness of the light source does not meet the requirements.
  • the signal of the light source brightness amplitude is partially lower than the image brightness amplitude signal, which causes image distortion.
  • the spot size is a spot with a width of one pixel along the scanning direction, and the influence of the time superposition of the spot at the same position of the scan can be ignored to solve the problem of uneven brightness distribution in the sub-image area.
  • the method of selecting the spot size to be one pixel wide along the scanning direction can also be applied to Embodiments 1 and 2 to solve the problem of uneven brightness distribution in the sub-image area.
  • the processing and control 14 system is based on the longitudinal distribution of the light spot (perpendicular to the scanning direction) Distribution) and the output brightness of the light source system 11, predicting the distribution of the light and dark distribution on the surface of the spatial light modulator 13 after scanning the spatial light modulator 13 for each color subframe spot, compared with the red, green and blue image signals,
  • the image modulation signal is output to the spatial light modulator 13.
  • the spatial light modulator 13 performs a deflection operation based on the input image modulation signal.
  • the light spot is a rectangular light spot including 1 ⁇ 108 pixels, where the ratio of the spot brightness of 54 pixel areas in the middle area to the spot brightness of the 27 pixel areas above and below is a:1 (a>1), then processing and control The device should consider the adverse effects caused by the uneven brightness distribution of the light spot, and combine the light spot distribution and the output brightness of the light source system 11 to output the image modulation signal to the spatial light modulator 13.
  • the examples are for illustrative purposes only, and the present invention does not limit the distribution of light spot brightness.
  • FIG. 4 is a schematic structural diagram of a display system according to Embodiment 5 of the present invention.
  • the display system 20 of the present invention includes a light source system 21, a scanner 22, a spatial light modulator 23, a processing and control system 24, a light source modulation device 25, an optical shaping device 26, and a flat field focusing lens 27.
  • the difference between this embodiment and Embodiment 1 is only that the processing and control system 24 in the provided display system further includes the deflection of the spatial modulator 23 and the scanning control of the scanner 22, and the processing and control system 24 outputs the image modulation
  • the signal is sent to the spatial light modulator 23, and after a preset time interval, the processing and control system 24 outputs a synchronization signal to the scanner 22.
  • Other devices can be carried out with reference to Example 1.
  • the optical shaping device 26 and the flat field focusing lens 27 are not necessary devices.
  • the processing and control system 24 outputs an image modulation signal to the spatial light modulator 23, and after a preset time interval, the processing and control system 24 outputs a synchronization signal to the scanner 22, and after the scanner 22 receives the synchronization signal , Direct the light beam to the initial scanning position on the surface of the spatial light modulator 23.
  • the preset time interval may be the maximum deflection time required by the spatial light modulator 23 within a color subframe.
  • the spatial light modulator 23 is a reflective liquid crystal light valve.
  • the processing and control system 24 outputs an image modulation signal to the spatial light modulator 23.
  • the reflective liquid crystal light valve performs an image of 1920 ⁇ 1080 pixels according to the image modulation signal. modulation.
  • the maximum deflection time required for the reflective liquid crystal light valve is 1.6 ms.
  • the processing and control system 24 after outputting the image modulation signal to the spatial light modulator 23 at a preset time interval, sends a synchronization signal to the scanner 22 to control it to start scanning. In this way, the processing and control system 24 can control the scanner 22 to start scanning after the spatial light modulator 23 completes the deflection, to avoid that the spatial light modulator deflection is not completed and the scanner has started scanning on the surface of the spatial light modulator 23 Resulting in image distortion.
  • Embodiment 6 the difference between this embodiment and Embodiment 5 is only that after the spatial light modulator 23 receives the image modulation signal and completes the deflection, the processing is synchronized with the output of the control system 24 ⁇ 22 ⁇ The signal to the scanner 22.
  • the time when the scanner 22 starts scanning is dynamically changed according to the required deflection time of the spatial light modulator 23 in each color subframe.
  • the processing and control system 24 outputs a synchronization signal to the scanner 22, and after receiving the synchronization signal, the scanner 22 directs the light beam to the spatial light The initial scanning position of the modulator 23 surface.
  • the processing and control system 24 after receiving the deflection completion signal of the spatial light modulator 23, the processing and control system 24 sends a synchronization signal to the scanner 22 to control it to start scanning. In this way, the processing and control system 24 can control the scanner 22 to start scanning after the spatial light modulator 23 completes the deflection, to avoid that the spatial light modulator deflection is not completed and the scanner has started scanning on the surface of the spatial light modulator 23 Resulting in image distortion.
  • FIG. 5 is a schematic structural diagram of a display system according to Embodiment 7 of the present invention.
  • the scanner group 32 includes two scanners 32a, 32b.
  • the scanner 32a scans the light beam emitted by the light source system 31 to the spatial light modulator 37a, and the scanner 32b will The light beam emitted by the light source system 31 scans to the spatial light modulator 37b.
  • the light combining system 38 is used to combine the image light emitted by the spatial light modulator 37a and the image light emitted by the spatial light modulator 37b.
  • the red, green, and blue laser light sources of the light source system 31 whose timing is adjusted.
  • An example of the timing adjustment method of the light source system 31 is shown in FIG. 6. Specifically, the image time of one frame is divided into the image time of the first half frame and the image time of the second half frame. During the first half of the image period, the red laser light source 31a is turned on, the green laser light source 31b is turned on, and the blue laser light source 31c is turned off; during the second half image period, the red laser light source 31a is turned off, the green laser light source 31b is turned on, and the blue laser light source 31c is turned on.
  • the examples are only for convenience of explanation. The present invention does not limit the sequence combination of turning on and off of the laser light source. Meanwhile, FIG. 6 is only for convenience of explanation, and the time ratio of the laser light source turned on in sequence is not limited.
  • the red laser light source 31a is turned on
  • the green laser light source 31b is turned on
  • the scanner 32a scans the red light beam emitted by the red laser light source 31a in the form of a spot to the spatial light modulator 37a
  • the scanner 32b The green light beam emitted by the green laser light source 31b is scanned to the spatial light modulator 37b in the form of a light spot.
  • the light combining device 38 combines the red image light and the green image light emitted by the spatial light modulator 37a and the spatial light modulator 37b to form red-green image light.
  • the blue laser light source 31c is turned on, the green laser light source 31b is turned on, and the red laser light source 31a is turned off.
  • the scanner 32a scans the blue laser beam emitted by the blue laser light source 31c into space light in the form of a light spot
  • the modulator 37a and the scanner 32b scan the green light beam emitted by the green laser light source 31b to the spatial light modulator 37b in the form of light spots.
  • the light combining device 38 combines the blue image light and the green image light emitted by the spatial light modulator 37a and the spatial light modulator 37b to form blue-green image light, and then combines it with the red-green image light formed in the first half of the image time To obtain the light beam of the image to be displayed.
  • the optical shaping device group 36 and the flat field focusing lens group 37 can also be included.
  • the optical shaping device group 36 and the flat field focusing lens group 37 can be carried out with reference to Embodiment 1.
  • the optical shaping device group 36 The flat field focusing lens group 37 is not a necessary device.
  • This embodiment uses two spatial light modulators to simultaneously modulate the red, green, and blue light spots formed on the surface of the corresponding scanner.
  • one of the scanners only needs to A frame image traverses its corresponding spatial light modulator in time, and another scanner only needs to traverse its corresponding spatial light modulator in one frame time. Therefore, the light source modulation devices of the red laser light source and the blue laser light source also complete the current modulation of the light source system within half a frame time, and the light source modulation device of the green laser light source only needs to complete the current modulation of the light source system within one frame time.
  • this embodiment can greatly reduce the scanning speed of the scanner and the current modulation speed of the light source modulation device.
  • FIG. 7 is a schematic structural diagram of a display system according to Embodiment 8 of the present invention.
  • the difference between the display system 40 of this embodiment and Embodiment 1 is that the red laser light source 41a, the green laser light source 41b, and the blue laser light source 41c in the light source system 41.
  • An example of the timing adjustment method of the light source system 41 is shown in FIG.
  • the scanner group 42 includes three scanners 42a, 42b, and 42c, and scans the red, green, and blue light beams emitted by the red laser light source 41a, the green laser light source 41b, and the blue laser light source 41c to the spatial light modulator in the form of light spots, respectively
  • the surfaces of the first spatial light modulator 47a, the second spatial light modulator 47b, and the third spatial light modulator 47c in group 47, and the three spatial light modulators modulate the red, green, and blue light spots on their surfaces, Each outputs red, green, and blue image lights.
  • the light combining system 48 is used to combine the red, green, and blue image lights along the combining light path to obtain a light beam to be displayed.
  • the optical shaping device group 46 and the flat field focusing lens group 47 can also be included.
  • the optical shaping device group 46 and the flat field focusing lens group 47 can be carried out with reference to Embodiment 1, the same as in Embodiment 1, the optical shaping device group 46
  • the flat field focusing lens group 47 is not a necessary device.
  • three spatial light modulators are used to simultaneously modulate the red, green, and blue light spots formed on the surface of the corresponding scanner.
  • the three scanners of this embodiment require only one frame time It traverses its corresponding spatial light modulator, and the light source modulation device also completes the current modulation of the light source system within a frame time.
  • This embodiment can greatly reduce the scanning speed of the scanner and the current modulation speed of the light source modulation device.

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Abstract

本发明公开了一种显示系统，该显示系统包括：光源系统，用于发出光束；扫描器，用于将光源系统发出的光束通过光斑的形式在空间光调制器表面扫描，光斑对应空间光调制器的多个像素；空间光调制器，根据处理与控制系统的图像调制信号，对扫描器投射至其上的光斑进行调制，输出图像光；处理与控制系统，根据输入的图像信号，输出光源时序调制信号至光源调制装置，并输出图像调制信号至空间光调制器；光源调制装置，用于根据光源时序调制信号，调节光源系统的输出亮度。通过上述方式，解决了现有光束扫描形式的投影系统高亮度和高分辨率无法同时兼得的问题，且实现了更高动态范围的图像显示。

Description

一种显示系统 技术领域
本发明涉及显示技术领域，特别是涉及一种显示系统。
背景技术
现有光束扫描形式的投影显示系统，利用激光具有较佳方向性的特点，通过扫描器件动态改变激光光束的方向，并在屏幕上形成画面。这种技术能大大简化光路结构，但对于光束准直性要求高，且为实现高分辨率，要求光斑尺寸要做到非常小。单模激光器能使光束及光斑实现上述特征，但是单模激光器限制了光束扫描形式的投影显示系统的输出亮度。多模激光器能够提高扫描式投影设备的输出亮度，但是即使在光源和扫描器的光路中增加光学整形器件，光束准直性和光斑尺寸也难以达到目前空间光调制器的主流分辨率。因此，对于现有光束扫描形式的投影显示系统，高亮度及高分辨率无法同时兼得。
发明内容
本发明提供一种显示系统，能够解决现有光束扫描形式的投影系统亮度和分辨率无法同时兼得的问题。
本发明采用一个技术方案是：提供一种显示系统，包括光源系统，用于发出光束；扫描器，用于将所述光源系统发出的光束通过光斑的形式在空间光调制器的表面扫描，所述光斑对应所述空间光调制器的多个像素；所述空间光调制器，根据处理与控制系统的图像调制信号，对所述扫描器投射至其上的所述光斑进行调制，输出图像光；所述处理与控制系统，根据输入的图像信号，输出光源时序调制信号i n(t)至 光源调制装置，并输出所述图像调制信号至所述空间光调制器；所述光源调制装置，用于根据所述光源时序调制信号i n(t)，调节所述光源系统的输出亮度。
在一种实施方式中，所述处理与控制系统，用于根据输入的所述图像信号，将图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)，结合所述光源系统的亮度与电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。
在一种实施方式中，所述处理与控制系统，用于根据输入的所述图像信号，将图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)，所述图像亮度幅值信号L in(t)通过低通滤波器后得到光源亮度幅值信号L s2n(t)，对光源亮度幅值信号L s2n(t)进行局部调整得到L s3n(t)，使得在每一帧图像内，光源亮度幅值信号L s3n(t)始终不小于所述图像亮度幅值信号L in(t)，光源亮度幅值信号L s3n(t)结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。
在一种实施方式中，所述处理与控制系统，用于根据输入的所述图像信号，并将图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)，将所述图像亮度幅值信号L in(t)与所述光斑的亮度分布L gn(t)进行反卷积运算得到光源亮度幅值信号L s1n(t)，光源亮度幅值信号L s1n(t)结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。
在一种实施方式中，所述处理与控制系统，用于根据输入的所述 图像信号，并将图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)，将所述图像亮度幅值信号L in(t)与所述光斑的亮度分布L gn(t)进行反卷积运算得到光源亮度幅值信号L s1n(t)，所述光源亮度幅值信号L s1n(t)通过低通滤波器后得到光源亮度幅值信号L s2n(t)，对光源亮度幅值信号L s2n(t)进行局部调整得到L s3n(t)，使得在每一帧图像内，光源亮度幅值信号L s3n(t)始终不小于所述图像亮度幅值信号L in(t)，光源亮度幅值信号L s3n(t)结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。由此，解决了因光源调制带宽较窄，光源亮度调节速度达不到要求，光源亮度幅值信号局部低于图像亮度幅值信号，导致图像失真的问题。
在一种实施方式中，所述低通滤波器的截止频率不小于所述光源系统的电流调制带宽。
在一种实施方式中，所述光斑沿扫描方向上的长度对应所述空间光调制器的像素小于2个。由此，可以简化运算步骤。
在一种实施方式中，所述子图像区域尺寸与所述光斑尺寸所对应的空间光调制器像素个数相同。
在一种实施方式中，所述处理与控制系统输出所述图像调制信号至所述空间光调制器，经预设时间间隔后，所述处理与控制系统输出同步信号至所述扫描器，所述扫描器接收所述同步信号后，将光束引导指向所述空间光调制器表面初始扫描位置。因此，可以避免空间光调制器偏转未完成时，扫描器已经开始在空间光调制器表面扫描带来的图像失真的问题。
在一种实施方式中，所述空间光调制器接收所述图像调制信号并完成偏转后，所述处理与控制系统输出同步信号至所述扫描器，所述 扫描器接收所述同步信号后，将光束引导指向所述空间光调制器表面初始扫描位置。
在一种实施方式中，所述空间光调制器为透射式液晶光阀或反射式液晶光阀。
在一种实施方式中，还包括：光学整形器件，设置于所述光源系统与所述扫描器之间的光路上，用于将所述光源系统发出的光束引导至所述扫描器。
在一种实施方式中，还包括：平场聚焦透镜，设置于所述扫描器与所述空间光调制器之间的光路上，用于将所述扫描器输出的偏转光束线性扫描至所述空间光调制器。
本发明的有益效果是：区别于现有技术的情况，本发明提供一种显示系统，包括光源系统、扫描器、空间光调制器、处理与控制系统、光源调制装置。本发明通过在空间光调制器的表面进行光斑扫描，并使得扫描光斑对应空间光调制器的多个像素，将图像调制的锐度问题主要交给空间光调制器解决，降低了扫描光斑的尺寸和精度的要求，使光源不再受限于单模激光器，解决了现有光束扫描形式的投影系统高亮度和高分辨率无法同时兼得的问题，与此同时，结合输入的图像信号同时对光斑亮度和空间光调制器进行调制，实现了更高动态范围的图像显示。
附图说明
图1是本发明实施例1～4提供的一种显示系统的结构示意图；
图2是本发明实施例1提供的一种显示系统的光源系统的时序调节方式示例；
图3是本发明实施例4提供的一种显示系统的电流调制算法流程图；
图4是本发明实施例5～6提供的一种显示系统的结构示意图；
图5是本发明实施例7提供的一种显示系统的结构示意图；
图6是本发明实施例7提供的一种显示系统的光源系统的时序调节方式示例；
图7是本发明实施例8提供的一种显示系统的结构示意图；
图8是本发明实施例8提供的一种显示系统的光源系统的时序调节方式示例。
具体实施方式
请参阅图1，图1是本发明实施例1提供的一种显示系统的结构示意图。如图1所示，本发明的显示系统10包括光源系统11、扫描器12、空间光调制器13、处理与控制系统14、光源调制装置15。光源系统11发出光束，光束被扫描器12通过光斑的形式在空间光调制器13的表面扫描，而后，经空间光调制器13调制而产生的图像光经投射出去形成显示图像(图中未示出)。处理与控制系统14，根据输入的图像信号，输出光源时序调制信号i n(t)至光源调制装置15，并输出图像调制信号至空间光调制器13。空间光调制器13根据图像调制信号对扫描至其表面上的光斑进行调制，光源调制装置15根据光源时序调制信号i n(t)，调节光源系统11的输出亮度。
具体地，光源系统11用于发出光束。优选地，光源系统11为激光光源系统。本实施例中，光源系统11为时序调节的红、绿、蓝三色激光光源，其中11a为红色激光光源、11b为绿色激光光源、11c为蓝色激光光源。请参照图2，图2为光源系统11的时序调节方式示例。具体地，当红色激光光源11a开启时，绿色激光光源11b和蓝色激光光源11c关闭；绿色激光光源11b开启时，红色激光光源11a和蓝色激光光源11c关闭；蓝色激光光源11c开启时，红色激光光源11a 和绿色激光光源11b关闭。
扫描器12用于将光源系统11发出的光束通过光斑的形式在空间光调制器13的表面扫描，光斑对应所述空间光调制器13的多个像素。优选地，光斑形状为矩形。
举例而言，空间光调制器13的像素数为1920×1080，光斑可以是囊括1×108个像素的矩形光斑，光斑也可以是囊括10×10个像素的矩形光斑。举例仅为说明方便，本发明不限定光斑尺寸具体数值。
扫描器12可以是一个二维扫描镜、两个一维扫描镜级联的二维扫描镜、旋转多面镜、旋转扫描镜、MEMS(Micro-Electro-Mechanical System)振镜、电光晶体、声光晶体、光相控阵、液晶光偏转器件、利用共振的光纤扫描器件等。
优选地，空间光调制器13为透射式液晶光阀或反射式液晶光阀。该类空间光调制器为“模拟型器件”，通过改变液晶取向并结合检偏器，实现对光束透过率的调节，一旦液晶取向调节完成，能够稳定的控制光透过率。
处理与控制系统14根据输入图像信号，将图像信号拆分成对应的红、绿、蓝三色图像信号，与图像信号对应的一帧图像被拆分红、绿、蓝三个颜色子帧图像，并分别将红、绿、蓝三个颜色子帧图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)，结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)，并输出至光源调制装置15。
子图像区域尺寸与光斑尺寸所对应的空间光调制器13像素个数相同。举例而言，光斑是包括1×108个像素的矩形光斑，子像素区域即包括1×108个像素。
光源调制装置15根据光源时序调制信号i n(t)，调节光源系统11的输出亮度，以调节扫描器12在空间光调制器13表面扫描的光斑亮度。同时，处理与控制系统14根据光源系统11的输出亮度预测每一颜色子帧光斑扫描空间光调制器13后，空间光调制器13表面的明暗分布情况，与红、绿、蓝三色图像信号对比，输出图像调制信号至空间光调制器13。空间光调制器13根据输入的图像调制信号执行偏转动作。
举例说明，处理与控制系统14根据输入图像信号，将图像信号拆分成对应的红、绿、蓝三色图像信号，与图像信号对应的一帧被拆分成红、绿、蓝三个颜色子帧图像。假设每一帧图像有1920×1080个像素，那么红、绿、蓝三个颜色子帧图像中，每一颜色子帧图像也有1920×1080个像素。取子图像区域为1×108个像素，那么每一颜色子帧中包含19200个子区域，根据光斑扫描方向和每个子区域的最大像素亮度，可以得到随扫描时间变化的图像亮度幅值信号L in(t)。以红色子帧为例，红色子帧对应的图像亮度幅值信号为L iR(t)，结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i R(t)控制光源调制装置15，以调节红色激光光源11a输出亮度。光源系统亮度与光源电流之间的关系i＝f(L)由光源系统的特性决定，一般来说，在光源系统可调节范围内，光源系统的输入电流越大，对应亮度越大；在确定光源系统的前提下，光源系统亮度与光源电流之间的关系可通过查询获得。蓝色子帧内蓝色激光光源的输出亮度调节方式和绿色子帧内绿色激光光源的输出亮度调节方式与以上所述红色激光光源的输出亮度调节方式类似，因此不再赘述。
在本实施例中，还可包括光学整形器件16和平场聚焦透镜17。光学整形器件16，设置于光源系统11与扫描器13之间的光路上， 用于对光源系统11发出的光束进行整形，得到均匀且发散角较小的光束，并将光束引导至扫描器12。光学整形器件16可以为方棒或复眼透镜等光学器件。平场聚焦透镜17，设置于所述扫描器12与所述空间光调制器13之间的光路上，用于将扫描器12输出的偏转光束线性扫描至空间光调制器13。通过这种方式，实现了扫描器12以光斑的形式在空间光调制器13表面进行匀速的线性扫描。光学整形器件16和平场聚焦透镜17并非必要器件，亦可省略。
出于成本的考虑，某些光源的调制带宽不够大，当需要对亮度进行较大范围的调节时，光源无法满足调制需求，因此可能会出现光源亮度幅值信号局部低于图像亮度幅值信号而使得图像失真的情况。
具体地，由于光源调制带宽较窄，光源亮度调节速度达不到要求，因此在图像亮度幅值信号骤变的区域(一般为图像高频区域)，光源亮度调节无法快速跟踪，意味着在图像亮度幅值信号骤升区域，光源输出亮度不能立即上升至到图像亮度幅值信号要求值；而在骤降区域，同样无法精确降至图像亮度幅值信号的要求值。
本发明实施例2将图像亮度幅值信号先进行低通滤波而后进行局部调整以解决此问题。实施例2与实施例1的区别仅在于，图像亮度幅值信号L in(t)通过低通滤波器并经过局部调整得到光源亮度幅值信号L s3n(t)，光源亮度幅值信号L s3n(t)结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。
具体地，处理与控制系统14据输入的所述图像信号，并将图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)，图像亮度幅值信号L in(t)通过低通滤波器后得到光源亮度幅值信号L s2n(t)。其中，低通滤波器的截止频率不小于所述光源系统 电流调制带宽。此运算目的在于确定图像亮度幅值信号L in(t)的高频调制区域，即图像亮度幅值信号L in(t)中频率高于光源系统电流调制带宽的区域。
对滤波后光源亮度幅值信号L s2n(t)进行局部调整。其中，局部调整是对目标信号增加一定数值以满足调制要求。通过局部调整，在每一帧图像内，光源亮度幅值信号L s3n(t)始终不小于所述图像亮度幅值信号L in(t)，光源亮度幅值信号L s3n(t)结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。光源系统亮度与光源电流之间的关系i＝f(L)由光源系统的特性决定，一般来说，在光源系统可调节范围内，光源系统的输入电流越大，对应亮度越大；在确定光源系统的前提下，光源系统亮度与光源电流之间的关系可通过查询获得。
由于空间光调制器对图像的精确调节，只会通过对其表面的光斑进行“减光”操作，因此对于后者，即光源输出亮度高于图像亮度幅值信号的要求值的情况，通过空间光调制器调制，即可恢复图像原因亮度；而对于光源输出亮度低于图像亮度幅值信号的要求值的情况，即使通过空间光调制器进一步调制，也无法增加图像亮度，从而导致图像失真。因此，本发明对光源亮度幅值信号L s2n(t)进行局部调整，将光源亮度幅值信号的数值部分上调，例如，在光源亮度幅值信号L s2n(t)低于图像亮度幅值信号L in(t)的区域，给光源亮度幅值信号L s2n(t)增加一个数值，数值大小根据光源亮度幅值信号L s2n(t)和图像亮度幅值信号L in(t)的差值决定，使得在一帧图像内，局部调整后光源亮度幅值信号L s3n(t)始终不小于所述图像亮度幅值信号L in(t)。可以理解，为了运算简便，也可以将整帧图像的光源亮度幅值信号全部上调，以满足在图像高亮度区域的准确显示。
实施例2的其他器件位置及功能可以参照实施例1的描述，此处不再赘述。
本实施例中，与实施例1相比，增加低通滤波和局部调整的计算操作，解决了因光源调制带宽较窄，光源亮度调节速度达不到要求，光源亮度幅值信号局部低于图像亮度幅值信号而导致图像失真的问题。
一般地，经过光束匀光、整形，认为扫描在空间光调制器表面的光斑为面分布均匀的光斑。但在实际产品中，兼顾匀光装置的体积与匀光效果，很难在较小的光路尺寸下实现完全均匀的光斑，也即可能存在光斑亮度分布不均匀的情况，尤其在省略匀光装置的系统中，通常激光光斑的亮度分布为高斯分布。对于默认光斑为均匀分布的系统，无法得到还原度高的图像显示。为方便叙述，将此类光斑自身亮度分布不均的情况称为光斑内部亮度分布不均匀。
此外，在连续扫描模式下，空间光调制器表面的光斑的亮度会随着时间变化，进而导致子图像区域内的光分布不均匀，那么对各个子图像区域进行图像调制时将不得不考虑时间叠加后的光斑亮度分布问题。为方便叙述，将此类由光斑亮度随着时间变化导致的子图像区域内的光分布不均匀的情况，称之为子图像区域亮度分布不均匀。
为进一步解决以上所述光斑内部亮度分布不均匀和子图像区域亮度分布不均匀问题，实施例3在实施例1的基础上，对图像亮度幅值信号与光斑亮度分布进行反卷积运算。实施例3与实施例1的区别仅在于，图像亮度幅值信号L in(t)与所述光斑的亮度分布L gn(t)进行反卷积运算得到光源亮度幅值信号L s1n(t)，光源亮度幅值信号L s1n(t)结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。
具体地，处理与控制系统14根据输入的所述图像信号，并将图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)，将所述图像亮度幅值信号L in(t)与所述光斑的亮度分布L gn(t)进行反卷积运算得到光源亮度幅值信号L s1n(t)，光源亮度幅值信号L s1n(t)结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。光源系统亮度与光源电流之间的关系i＝f(L)由光源系统的特性决定，一般来说，在光源系统可调节范围内，光源系统的输入电流越大，对应亮度越大；在确定光源系统的前提下，光源系统亮度与光源电流之间的关系可通过查询获得。
因此本实施例与实施例1相比，对图像亮度幅值信号L in(t)与所述光斑的亮度分布L gn(t)进行反卷积运算得到光源亮度幅值信号L s1n(t)，同时解决了光斑内部亮度分布不均匀和子图像区域亮度分布不均匀的问题。
当然，如果光斑沿扫描方向上的长度对应所述空间光调制器的像素小于2个，则运算过程可简化。这是由于，当光斑沿扫描方向上的长度足够小时，同一位置处，光斑在时间上的光通量叠加可以忽略。具体地，优选光斑尺寸为沿扫描方向呈一个像素宽的光斑。举例而言，若光斑是包括1×108个像素的矩形光斑或是1×10个像素的矩形光斑，则图像亮度幅值信号L in(t)与所述光斑的亮度分布L gn(t)进行反卷积运算得到光源亮度幅值信号L s1n(t)的运算过程可简化。采用光斑尺寸为沿扫描方向呈一个像素宽的光斑可以解决子图像区域亮度分布不均匀的问题，但是光斑内部亮度分布不均匀的问题仍然可能存在。在本发明实施例3的一个变形实施例中，在采用光斑尺寸为沿扫描方向呈一个像素宽的光斑的基础上，综合考虑光斑纵向分布情况，以同 时解决光斑内部亮度分布不均匀及子图像区域亮度分布不均匀的问题。
具体地，处理与控制14系统根据光斑纵向分布(垂直于扫描方向上的分布)及光源系统11的输出亮度，预测每一颜色子帧光斑扫描空间光调制器13后，空间光调制器13表面的明暗分布情况，与红、绿、蓝三色图像信号对比，输出图像调制信号至空间光调制器13。空间光调制器13根据输入的图像调制信号执行偏转动作。
实施例3的其他器件位置及功能可以参照实施例1的描述，此处不再赘述。
实施例3与实施例1类似，同样可能存在光源系统的亮度调制速度受光源调制带宽的限制，使得光源亮度幅值信号局部低于图像亮度幅值信号而使得图像失真的情况，本发明实施例4对实施例3中反卷积运算后的得到的图像亮度幅值信号先进行低通滤波而后进行局部调整以解决此问题。
图3是本发明实施例4提供的一种显示系统的电流调制算法流程图。具体地，处理与控制系统14工作时，电流调制算法可以包括步骤S1-S6。
步骤S1：根据输入的图像信号，将图像沿光斑扫描方向分割成多个子图像区域。
步骤S2：根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)。
步骤S3：将图像亮度幅值信号L in(t)与光斑的亮度分布L gn(t)进行反卷积运算得到光源亮度幅值信号L s1n(t)。
步骤S4：将光源亮度幅值信号L s1n(t)通过低通滤波器，得到滤波后光源亮度幅值信号L s2n(t)。
步骤S5：对光源亮度幅值信号L s2n(t)进行局部调整，使得在每一帧图像内，光源亮度幅值信号L s3n(t)始终不小于所述图像亮度幅值信号L in(t)。
步骤S6：结合光源系统亮度与光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。
具体地，处理与控制系统14根据输入图像信号，将图像信号拆分成对应的红、绿、蓝三色图像信号，与图像信号对应的一帧被拆分成红、绿、蓝三个颜色子帧。
以红色子帧内，对红色激光光源输出亮度的调制为例。假设每一帧图像有1920×1080个像素，那么红、绿、蓝三个颜色子帧中，每一个颜色子帧也有1920×1080个像素。取子图像区域为2×108个像素，那么每一颜色子帧中包含9600个子区域，根据光斑扫描方向和每个子区域的最大像素亮度，可以得到随扫描时间变化的图像亮度幅值信号L iR(t)，其中红色子帧对应的图像亮度幅值信号为L iR(t)，将L iR(t)与对应红色光斑亮度分布L gR(t)进行反卷积运算得到红色光源亮度幅值信号L s1R(t)，通过低通滤波器后，得到红色光源亮度幅值信号L s2R(t)，对滤波后波形进行局部调整，使得在红色子帧时间内，红色光源亮度幅值信号L s3R(t)始终不小于红色图像亮度幅值信号L iR(t)。红色光源亮度幅值信号L s3R(t)结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到红色光源时序调制信号i R(t)控制光源调制装置15调节红色激光光源11a的输出亮度。光源系统亮度与光源电流之间的关系i＝f(L)由光源系统的特性决定，一般来说，在光源系统可调节范围内，光源系统的输入电流越大，对应亮度越大；在确定光源系统的前提下，光源系统亮度与光源电流之间的关系可通过查询获得。蓝色子帧内蓝色激光光源的输出亮度调节方式和绿色子帧内绿色激 光光源的输出亮度调节方式与以上所述红色激光光源的输出亮度调节方式类似，因此不再赘述。
本实施例与实施例1相比，通过反卷积运算，可同时解决光斑内部亮度分布不均匀及子图像区域亮度分布不均匀，并且增加低通滤波和局部调整的计算操作，解决了因光源调制带宽较窄，光源亮度调节速度达不到要求，光源亮度幅值信号局部低于图像亮度幅值信号而导致图像失真的问题。
当然，与实施例3类似，如果光斑沿扫描方向上的长度对应所述空间光调制器的像素小于2个，则图像亮度幅值信号L in(t)与所述光斑的亮度分布L gn(t)进行反卷积运算得到光源亮度幅值信号L s1n(t)的运算过程可简化。具体地，优选光斑尺寸为沿扫描方向呈一个像素宽的光斑，可忽略光斑在扫描同一位置的时间叠加的影响，即可解决子图像区域亮度分布不均匀的问题。选用光斑尺寸为沿扫描方向呈一个像素宽的光斑的方法亦可应用于实施例1和实施例2以解决子图像区域亮度分布不均匀的问题。
然而，根据以上描述中，采用这种简化算法仍然存在光斑内部亮度分布不均匀。在本发明实施例4的一个变形实施例中，为解决上述问题，在光斑沿扫描方向上的长度小于2个像素的方案的基础上，处理与控制14系统根据光斑纵向分布(垂直于扫描方向上的分布)及光源系统11的输出亮度，预测每一颜色子帧光斑扫描空间光调制器13后，空间光调制器13表面的明暗分布情况，与红、绿、蓝三色图像信号对比，输出图像调制信号至空间光调制器13。空间光调制器13根据输入的图像调制信号执行偏转动作。
具体地，假设光斑是包括1×108个像素的矩形光斑，其中中间区域54个像素区域的光斑亮度与上下各27像素区域的光斑亮度比 为a:1(a＞1)，则处理与控制装置应考虑光斑亮度分布不均匀带来的不利影响，结合光斑分布及光源系统11的输出亮度，输出图像调制信号至空间光调制器13。举例仅为说明方便，本发明不限定光斑亮度分布情况。
请参阅图4，图4是本发明实施例5提供的一种显示系统的结构示意图。本发明的显示系统20包括光源系统21、扫描器22、空间光调制器23、处理与控制系统24、光源调制装置25、光学整形器件26、平场聚焦透镜27。本实施例与实施例1的区别仅在于，提供的显示系统中处理与控制系统24还包括对空间调制器23的偏转和对扫描器22的扫描控制，处理与控制系统24输出所述图像调制信号至空间光调制器23，经预设时间间隔后，处理与控制系统24输出同步信号至扫描器22。其他器件可参照实施例1进行，与实施例1相同，光学整形器件26、平场聚焦透镜27并非必要器件。
具体地，处理与控制系统24输出图像调制信号至空间光调制器23，经预设时间间隔后，处理与控制系统24输出同步信号至所述扫描器22，扫描器22接收所述同步信号后，将光束引导指向所述空间光调制器23表面初始扫描位置。其中，预设时间间隔可以为一颜色子帧内，空间光调制器23所需最大偏转时间。
举例而言，空间光调制器23为反射式液晶光阀，处理与控制系统24输出图像调制信号至空间光调制器23，反射式液晶光阀根据图像调制信号对1920×1080个像素的图像进行调制。反射式液晶光阀所需最大偏转时间为1.6ms，那么在空间光调制器23接收图像调制信号的1.6ms后，处理与控制系统24输出同步信号至扫描器22。扫描器22接收同步信号后，扫描器22将光束引导指向空间光调制器23表面初始扫描位置并开始扫描动作。
本实施例中，处理与控制系统24在输出图像调制信号至空间光调制器23的预设时间间隔后，发送同步信号至扫描器22以控制其开始扫描。通过这种方式，处理与控制系统24可以实现控制扫描器22在空间光调制器23完成偏转后开始扫描，以避免空间光调制器偏转未完成而扫描器已经在空间光调制器23表面开始扫描导致的图像失真的情况。
在本发明实施例5的变形实施例中，如实施例6，该实施例与实施例5的区别仅在于，空间光调制器23接收图像调制信号并完成偏转后，处理与控制系统24输出同步信号至扫描器22。在本实施例中，扫描器22开始扫描的时间是根据每一颜色子帧内空间光调制器23的所需偏转时间动态变化的。
具体地，空间光调制器23接收所述图像调制信号并完成偏转后，处理与控制系统24输出同步信号至所述扫描器22，扫描器22接收同步信号后，将光束引导指向所述空间光调制器23表面初始扫描位置。
本实施例中，处理与控制系统24在接收空间光调制器23偏转完成信号后，发送同步信号至扫描器22以控制其开始扫描。通过这种方式，处理与控制系统24可以实现控制扫描器22在空间光调制器23完成偏转后开始扫描，以避免空间光调制器偏转未完成而扫描器已经在空间光调制器23表面开始扫描导致的图像失真的情况。
请参阅图5，图5是本发明实施例7提供的一种显示系统的结构示意图。
本实施例的显示系统30与实施例1的区别在于：扫描器组32包括两个扫描器32a、32b，扫描器32a将光源系统31发出的光束扫描至空间光调制器37a，扫描器32b将光源系统31发出的光束扫描至 空间光调制器37b。合光系统38用于将空间光调制器37a发出的图像光和空间光调制器37b发出的图像光合光。
本实施例中，光源系统31时序调节的红、绿、蓝三色激光光源，光源系统31的时序调节方式示例如图6所示。具体地，将一帧图像时间分为前半帧图像时间和后半帧图像时间。在前半帧图像时间内，红色激光光源31a开启，绿色激光光源31b开启，蓝色激光光源31c关闭；在后半帧图像时间内，红色激光光源31a关闭，绿色激光光源31b开启，蓝色激光光源31c开启。举例仅为说明方便，本发明不限定激光光源的开启和关闭的序列组合，同时，图6仅为说明方便，时序开启的激光光源时间占比不受限制。
具体而言，在前半帧图像时间内，红色激光光源31a开启，绿色激光光源31b开启，扫描器32a将红色激光光源31a发出的红色光束以光斑的形式扫描至空间光调制器37a，扫描器32b将绿色激光光源31b发出的绿色光束以光斑的形式扫描至空间光调制器37b。合光装置38将空间光调制器37a和空间光调制器37b发出的红色图像光和绿色图像光合光，形成红-绿图像光。在后半帧图像时间内，蓝色激光光源31c开启，绿色激光光源31b开启，红色激光光源31a关闭，扫描器32a将蓝色激光光源31c发出的蓝色激光光束以光斑的形式扫描至空间光调制器37a，扫描器32b将绿色激光光源31b发出的绿色光束以光斑的形式扫描至空间光调制器37b。合光装置38将空间光调制器37a和空间光调制器37b发出的蓝色图像光和绿色图像光合光，形成蓝-绿图像光，再与前半帧图像时间内形成的红-绿图像光合光，从而得到待显示图像的光束。
在本实施例中，还可包括光学整形器件组36和平场聚焦透镜组37，光学整形器件组36和平场聚焦透镜组37可参照实施例1进行， 与实施例1相同，光学整形器件组36、平场聚焦透镜组37并非必要器件。
本实施例采用两个空间光调制器，同时调制对应扫描器在其表面形成的红、绿、蓝三色光斑，与实施例1相比，本实施例中，其中一个扫描器只需在半帧图像时间内遍历其对应的空间光调制器，另外一个扫描器只需在一帧图像时间内遍历其对应的空间光调制器。因此，红色激光光源和蓝色激光光源的光源调制装置也在半帧时间内完成对光源系统的电流调制，绿色激光光源的光源调制装置只需要在一帧时间内完成对光源系统的电流调制。与第一实施例相比，本实施例可以大大降低扫描器的扫描速度和光源调制装置的电流调制速度。
实施例7中每一颜色子帧内，光源系统31、扫描器组32、空间光调制器组33、处理与控制系统34、光源调制装置35的工作方式及调制方法可参照上述各实施例，此处不再赘述。
请参阅图7，图7是本发明实施例8提供的一种显示系统的结构示意图。
本实施例的显示系统40与实施例1的区别在于：光源系统41中红色激光光源41a、绿色激光光源41b、蓝色激光光源41c，光源系统41的时序调节方式示例如图8所示。扫描器组42包括三个扫描器42a、42b、42c，将红色激光光源41a、绿色激光光源41b、蓝色激光光源41c发出的红、绿、蓝光束以光斑的形式分别扫描至空间光调制器组47中第一空间光调制器47a、第二空间光调制器47b、第三空间光调制器47c表面，三个空间光调制器分别对其表面的红、绿、蓝三色光斑进行调制，各自输出红、绿、蓝三色图像光，合光系统48用于将红、绿、蓝三色图像光沿合光光路进行合光，从而得到待显示图像的光束。
在本实施例中，还可包括光学整形器件组46和平场聚焦透镜组47，光学整形器件组46和平场聚焦透镜组47可参照实施例1进行，与实施例1相同，光学整形器件组46、平场聚焦透镜组47并非必要器件。
本实施例采用三个空间光调制器，同时调制对应扫描器在其表面形成的红、绿、蓝三色光斑，与实施例7相比，本实施例三个扫描器只需在一帧时间内遍历其对应的空间光调制器，光源调制装置也在一帧时间内完成对光源系统的电流调制，本实施例可以大大降低扫描器的扫描速度和光源调制装置的电流调制速度。
实施例8中每一颜色子帧内，光源系统41、扫描器组42、空间光调制器组43、处理与控制系统44、光源调制装置45的工作方式及调制方法可参照上述各实施例，此处不再赘述。
以上仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (12)

  1. 一种显示系统，其特征在于，包括：
    光源系统，用于发出光束；
    扫描器，用于将所述光源系统发出的光束通过光斑的形式在空间光调制器的表面扫描，所述光斑对应所述空间光调制器的多个像素；
    所述空间光调制器，根据处理与控制系统的图像调制信号，对所述扫描器投射至其上的所述光斑进行调制，输出图像光；
    所述处理与控制系统，根据输入的图像信号，输出光源时序调制信号i n(t)至光源调制装置，并输出所述图像调制信号至所述空间光调制器；
    所述光源调制装置，用于根据所述光源时序调制信号i n(t)，调节所述光源系统的输出亮度。
  2. 根据权利要求1所述的显示系统，其特征在于，所述处理与控制系统，用于根据输入的所述图像信号，将图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)，结合所述光源系统的亮度与电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。
  3. 根据权利要求1所述的显示系统，其特征在于，所述处理与控制系统，用于根据输入的所述图像信号，将图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)，所述图像亮度幅值信号L in(t)通过低通滤波器后得到光源亮度幅值信号L s2n(t)，对光源亮度幅值信号L s2n(t)进行局部调整得到L s3n(t)，使得在 每一帧图像内，光源亮度幅值信号L s3n(t)始终不小于所述图像亮度幅值信号L in(t)，光源亮度幅值信号L s3n(t)结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。
  4. 根据权利要求1所述的显示系统，其特征在于，所述处理与控制系统，用于根据输入的所述图像信号，将图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)，将所述图像亮度幅值信号L in(t)与所述光斑的亮度分布L gn(t)进行反卷积运算得到光源亮度幅值信号L s1n(t)，光源亮度幅值信号L s1n(t)结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。
  5. 根据权利要求1所述的显示系统，其特征在于，所述处理与控制系统，用于根据输入的所述图像信号，并将图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素亮度，得到沿光斑扫描方向各所述子图像区域的图像亮度幅值信号L in(t)，将所述图像亮度幅值信号L in(t)与所述光斑的亮度分布L gn(t)进行反卷积运算得到光源亮度幅值信号L s1n(t)，所述光源亮度幅值信号L s1n(t)通过低通滤波器后得到光源亮度幅值信号L s2n(t)，对光源亮度幅值信号L s2n(t)进行局部调整得到L s3n(t)，使得在每一帧图像内，光源亮度幅值信号L s3n(t)始终不小于所述图像亮度幅值信号L in(t)，光源亮度幅值信号L s3n(t)结合所述光源系统亮度与所述光源电流之间的关系i＝f(L)，得到光源时序调制信号i n(t)。
  6. 根据权利要求3或5所述的显示系统，其特征在于，所述低通滤波器的截止频率不小于所述光源系统的电流调制带宽。
  7. 根据权利要求2～5中任一项所述的显示系统，其特征在于， 所述光斑沿扫描方向上的长度对应所述空间光调制器的像素小于2个。
  8. 根据权利要求1～5中任一项所述的显示系统，其特征在于，所述子图像区域尺寸与所述光斑尺寸所对应的空间光调制器像素个数相同。
  9. 根据权利要求1～5中任一项所述的显示系统，其特征在于，所述处理与控制系统输出所述图像调制信号至所述空间光调制器，经预设时间间隔后，所述处理与控制系统输出同步信号至所述扫描器，所述扫描器接收所述同步信号后，将光束引导指向所述空间光调制器表面初始扫描位置；或者
    所述空间光调制器接收所述图像调制信号并完成偏转后，所述处理与控制系统输出同步信号至所述扫描器，所述扫描器接收所述同步信号后，将光束引导指向所述空间光调制器表面初始扫描位置。
  10. 根据权利要求9所述的显示系统，其特征在于，所述空间光调制器为透射式液晶光阀或反射式液晶光阀。
  11. 根据权利要求1所述的显示系统，其特征在于，还包括：
    光学整形器件，设置于所述光源系统与所述扫描器之间的光路上，用于将所述光源系统发出的光束引导至所述扫描器。
  12. 根据权利要求1所述的显示系统，其特征在于，还包括：
    平场聚焦透镜，设置于所述扫描器与所述空间光调制器之间的光路上，用于将所述扫描器输出的偏转光束线性扫描至所述空间光调制器。
PCT/CN2019/127269 2018-12-28 2019-12-23 一种显示系统 Ceased WO2020135294A1 (zh)

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CN113960863B (zh) * 2020-07-21 2025-08-26 深圳光峰科技股份有限公司 显示装置
IL303770B2 (en) * 2020-12-20 2024-03-01 Lumus Ltd Image projector with laser scanning over spatial light modulator
CN115720260A (zh) * 2021-09-29 2023-02-28 巴可伟视(北京)电子有限公司 一种显示设备、控制方法及光源

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