WO2020042566A1 - 动态调节显示***色域的***、方法及显示*** - Google Patents
动态调节显示***色域的***、方法及显示*** Download PDFInfo
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- WO2020042566A1 WO2020042566A1 PCT/CN2019/076632 CN2019076632W WO2020042566A1 WO 2020042566 A1 WO2020042566 A1 WO 2020042566A1 CN 2019076632 W CN2019076632 W CN 2019076632W WO 2020042566 A1 WO2020042566 A1 WO 2020042566A1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B33/00—Colour photography, other than mere exposure or projection of a colour film
- G03B33/10—Simultaneous recording or projection
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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
- H04N9/315—Modulator illumination systems
- H04N9/3158—Modulator illumination systems for controlling the spectrum
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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
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
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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
- H04N9/315—Modulator illumination systems
- H04N9/3164—Modulator illumination systems using multiple light sources
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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
- H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
Definitions
- the present invention relates to a display system, and in particular to a projection system, a method, and a display system that dynamically adjust the color gamut of the display system.
- a basic laser fluorescent light source short-wavelength visible light emitted by a laser excites phosphors on a wavelength conversion device to generate time-series fluorescent primary color light or white light.
- the broad spectrum of fluorescence makes the light source ’s color gamut coverage narrow.
- the short-wavelength visible light emitted by the laser is converted into the primary color light by a wavelength conversion device and filtered by a synchronous filter to obtain a narrow-band and higher color purity primary color light to extend the color gamut of laser fluorescence.
- the filter device will bring additional optical power loss, which reduces the efficiency of using this light source.
- a solid-color red-green laser is added to the laser fluorescence to extend the color gamut of the light source.
- a solid-color red-green laser is added to the laser fluorescence to extend the color gamut of the light source.
- a solid-color red-green laser is added to the laser fluorescence to extend the color gamut of the light source.
- the mixing of pure color laser can expand the color gamut of laser fluorescence, it does not involve the modulation of the light source ratio according to the display content when the light source is used in a display system. Therefore, the range of color gamut that can be enhanced is limited.
- the color gamut of laser fluorescence is extended to the DCI-P3 standard, and a solid-color laser equivalent to 40% of the fluorescence brightness needs to be added. Therefore, a high-power red-green laser needs to be added, resulting in a large increase in system cost.
- the other way is to add sufficient red and green lasers to increase the color saturation of the red and green fluorescence through filter devices, and to synthesize the fluorescence and laser to meet the primary color of the rec2020 standard color gamut.
- this method also greatly reduces the efficiency (the typical ratio of red and green fluorescence is about 30%, which reduces the efficiency of the system by about 30%).
- the present invention provides a projection system, a method, and a display system for dynamically adjusting the color gamut of a display system, so as to solve the problems of increased cost and reduced efficiency caused by expanding the color gamut.
- the present invention provides a system for dynamically adjusting the color gamut of a display system.
- the display system includes a light source system and an imaging system.
- the light source system includes an excitation light source and a narrow-spectrum primary color light source.
- the excitation light source emits excitation.
- the excitation light includes at least one broad-spectrum primary light in the primary-color light outputted by the treatment, the narrow-spectrum primary-color light source outputs at least one narrow-spectrum primary-color light, and the narrow-spectrum primary-color light corresponds to a corresponding broad
- the spectral primary colors are photosynthesized and output to the imaging system.
- the imaging system includes a processing device, a storage device, and a spatial light modulation device.
- the system for dynamically adjusting the color gamut of the display system is stored in the storage device and processed by the processing device.
- the system for dynamically adjusting the color gamut of a display system includes a light source brightness adjustment module.
- the light source brightness adjustment module includes a brightest pixel acquisition module for calculating color coordinates and brightness of the brightest pixels of a frame of image.
- a broad-spectrum primary-color light-brightness generating module which is configured to according to the color coordinates and brightness of the primary-color light output by the light source system And the color coordinates and brightness of the brightest pixel, calculate the minimum brightness value of the required broad-spectrum primary color light, and calculate and control the brightness control value of the excitation light source according to the minimum brightness value of the required broad-spectrum primary color light; narrow-spectrum primary color Light intensity generating module, configured to calculate the minimum brightness value of the required narrow-spectrum primary color light according to the minimum brightness value of the required broad-spectrum primary color light, and calculate and control the narrow-spectrum basic color light according to the brightness value of the required narrow-spectrum primary color light.
- a brightness control value of the light source and a brightness signal output module, configured to generate the light source brightness signals of the excitation light source and the narrow-spectrum primary color light source according to the brightness control value of the broad-spectrum primary color light and the brightness control value of the narrow-spectrum primary light, And outputting the light source brightness signal to the excitation light source and the narrow-spectrum primary color light source to adjust the brightness of the light emitted by the excitation light source and the narrow-spectrum primary color light source.
- the present invention also provides a method for dynamically adjusting the color gamut of a display system.
- the display system includes a light source system and an imaging system.
- the light source system includes an excitation light source and a narrow-spectrum primary color light source.
- the excitation light emits at least one broad-spectrum primary color light
- the narrow-spectrum primary color light source outputs at least one narrow-spectrum primary color light.
- the narrow-spectrum primary-color light and the corresponding The broad-spectrum primary colors are photosynthesized and output to the imaging system.
- the imaging system includes a spatial light modulation device.
- the method includes: calculating the color coordinates and brightness of the brightest pixel of a frame of image;
- the color coordinates and brightness of the primary color light and the color coordinates and brightness of the brightest pixel point are used to calculate the minimum brightness value of the required broad-spectrum primary color light, and to calculate and control the excitation light source based on the minimum brightness value of the required broad-spectrum primary color light.
- Brightness control value according to the minimum brightness value of the required broad-spectrum primary color light, calculate the brightness value of the required narrow-spectrum primary color light, and according to the required Calculating and controlling the brightness control value of the narrow-spectrum primary color light source; and generating the corresponding brightness control value according to controlling the brightness control value of the excitation-light source and controlling the brightness control value of the narrow-spectrum primary light source.
- the light source brightness signals of the excitation light source and the narrow-spectrum primary color light source are output, and the light source brightness signal is output to the excitation light source and the narrow-spectrum primary color light source to adjust the light emission of the excitation light source and the narrow-spectrum primary color light source.
- the present invention further provides a display system, the display system includes a light source system and an imaging system, the light source system includes an excitation light source and a narrow-spectrum primary color light source, and the excitation light source emits excitation light,
- the primary color light output after the excitation light is processed includes at least one broad-spectrum primary color light.
- the narrow-spectrum primary color light source outputs at least one narrow-spectrum primary color light.
- the narrow-spectrum primary color light and the corresponding broad-spectrum primary color light are combined.
- the output to the imaging system includes the above-mentioned system for dynamically adjusting the color gamut of the display system and a spatial light modulation device.
- the system, method and display system for dynamically adjusting the display system provided by the embodiments of the present invention, on the one hand, use excitation light with better monochromaticity to synthesize new primary color light with wide-spectrum fluorescence, thereby expanding the color gamut of the display system;
- the minimum brightness of the broad-spectrum primary color light is calculated based on the brightness of the brightest pixels in the image screen. The brightness value of the broad-spectrum primary light is minimized while maintaining the screen brightness, so that the color gamut of the display system can be extended to the maximum.
- the compensated image signal of each pixel of the image is used to control the output of the spatial light modulation device, so as to compensate the color difference of each frame image due to the color gamut change according to the difference of each frame image.
- the system, method and display system for dynamically adjusting the color gamut of a display system provided in the embodiments of the present invention, while significantly enhancing the color gamut of the display system (for example, enhancing the color gamut of the display system to the REC2020 color gamut standard) while maintaining the display system more High efficiency and reduced chromatic aberration.
- FIG. 1 is a schematic structural diagram of a display system for dynamically adjusting a color gamut of a display system according to an embodiment of the present invention.
- FIG. 2 is a module diagram of a system for dynamically adjusting a color gamut of a display system according to an embodiment of the present invention.
- FIG. 3 is a flowchart of a method for dynamically adjusting a color gamut of a display system according to a first embodiment of the present invention.
- FIG. 4 is a flowchart of a method for dynamically adjusting a color gamut of a display system according to a second embodiment of the present invention.
- FIG. 5 is a flowchart of a method for dynamically adjusting a color gamut of a display system according to a third embodiment of the present invention.
- FIG. 1 is a schematic structural diagram of a display system according to an embodiment of the present invention.
- the display system 1 includes a light source system 10 and an imaging system 20.
- the light source system 10 includes an excitation light source 110, a narrow-spectrum primary color light source 120, and a wavelength conversion and light combining device 130.
- the short-wavelength excitation light emitted by the excitation light source 110 is guided to the wavelength conversion and light combining device 130, is absorbed by the wavelength conversion and light combining device 130 and generates a broad spectrum of primary color light, and a narrow spectrum of the narrow spectrum primary color light source 120.
- the primary-color light is guided to the wavelength conversion and light-combining device 130, and the light is combined with the broad-spectrum primary-color light at the wavelength conversion and light-combination device 130.
- the excitation light source 110 is a blue laser light source
- the excitation light emitted is a blue laser light.
- a wavelength conversion material and a scattering material are disposed on the wavelength conversion and light combining device 130 in a sub-region, and the wavelength conversion material includes red fluorescence.
- the powder material and the green phosphor material for convenience of explanation, the area where the red fluorescent material is provided is called a "red light area”, the area where the green fluorescent material is provided is called a "green light area”, and the scattering material is provided. The area is called "Blu-ray area”.
- the narrow-spectrum primary color light source 120 includes a red laser light source and a green laser light source, and the red laser light source and the green laser light source emit two kinds of primary color light: red laser light and green laser light, and the red laser light is guided to the wavelength conversion and The light combining device 130 combines light with the red fluorescence, and the green laser light is guided to the wavelength conversion and the light combining device 130 is combined with the green fluorescence. Therefore, the light source system 10 finally outputs three primary color illumination lights of red, green, and blue to the imaging system 20.
- the red light R, green light G, and blue light G output by the light source system 10 are referred to as the light source three-primary color light, which corresponds to the image data to be displayed by the three primary color light.
- Each pixel of the image data can be represented by the three primary colors, that is, P (r, g, b).
- the red fluorescence r, green fluorescence g, blue laser b, red laser r ', and green laser b' output by the light source system 10 are referred to as the five primary light sources of the light source, and correspond to the image data to be displayed by the five primary light sources.
- Each pixel of the image data can also be represented by the five primary colors, that is, P (r, g, b, r ', b'). Descriptions such as the three primary color coordinates and brightness of the light source system 10, the five primary color coordinates and brightness of the light source system 10, the pixel three primary color coordinates and brightness, and the pixel five primary color coordinates and brightness will appear below.
- the three primary color coordinates and brightness of the system 10 refer to the color coordinates and brightness of the red, green, and blue light G output from the light source system 10 in a certain color space.
- the three primary color coordinates and brightness of the pixel refer to The coordinates and brightness of the three primary colors of each pixel in a frame in a certain color space.
- the coordinates and brightness of the five primary colors of the light source system 10 refer to the red fluorescence r, green fluorescence g, blue laser light b, The color coordinates and brightness of the five primary colors of red laser r 'and green laser b' in a certain color space.
- the pixel five primary color coordinates and brightness refer to the five primary colors of each pixel in a frame in an image. Coordinates and brightness.
- the manner of guiding the excitation light and the narrow-spectrum primary color light to the wavelength conversion and light combining device 130 and the manner of guiding the primary color light from the wavelength conversion and light combining device 130 to the imaging system 20 can refer to the existing Technology is not described here.
- the wavelength conversion and light combining device 130 may be separated into two devices: the wavelength conversion device and the light combining device, and the two may be disposed adjacently or separately, which is not limited herein.
- the light source system 10 may further include a filtering device, and the filtering device may be integrated with or separated from the wavelength conversion and light combining device 130, which is not limited herein.
- the light source system 10 may also generate blue light and yellow fluorescence first, and then filter out red fluorescence and green fluorescence from the yellow fluorescence.
- the light source system 10 includes an excitation light source 110 and a narrow-spectrum primary color light source 120.
- the excitation light emitted by the excitation light source 110 is processed, for example, to output blue light and wide spectrum after operation such as wavelength conversion, filtering, or scattering.
- Red, green light the narrow-spectrum primary color light source 120 outputs at least one narrow-spectrum primary color light, the at least one narrow-spectrum primary color light is narrow-spectrum red and / or green light, the blue light,
- the wide-spectrum red-green light and the narrow-spectrum red and / or green light constitute a multi-primary color light source with more than three primary colors.
- the narrow-spectrum primary color light and the corresponding broad-spectrum primary color light combine to make the light source system.
- the three primary color lights of red, green, and blue are output to the imaging system, and the three primary color lights of red, green, and blue constitute the three primary color lights of the light source.
- the imaging system 20 includes a processing device 210, a storage device 220, and a spatial light modulation device 230.
- the processing device 210 is electrically connected to the storage device 220, the spatial light modulation device 230, and an image source 30.
- the processing device 210 receives an image signal from the image source 30.
- the spatial light modulation device 230 under the control of the processing device 210, modulates the primary color light output by the light source system 10 into image light carrying image information.
- the image light is output and projected onto a screen (not shown) through a projection lens 240 to form an image.
- a system 221 for dynamically adjusting the color gamut of a display system (hereinafter referred to as "dynamic adjustment system 221") is installed and operated in the imaging system 20.
- the dynamic adjustment system 221 can be divided into one Or multiple modules, the one or more modules are stored in the storage device 220 and executed by the processing device 210, so that the color gamut of the display system 1 is dynamically adjusted according to the display content of the display system 1.
- the processing device 210 obtains the original signal of the image in real time from the image source 30. For a specific frame of image, the processing device 210 runs the dynamic adjustment system 221, and calculates and displays the frame image based on the obtained original signal.
- the required minimum luminance value of the broad-spectrum primary color light and the required minimum luminance value of the narrow-spectrum primary color light and correspondingly generate light source luminance signals for controlling the excitation light source 110 and the narrow-spectrum primary color light source 120, and the light source luminance signal is output to a
- the gamma corrector 40 is corrected by the gamma corrector 40 and output to the excitation light source 110 and the narrow-spectrum primary color light source 120 to adjust the brightness of the illumination light emitted by the excitation light source 110 and the narrow-spectrum primary color light source 120, thereby
- the five primary colors of light having different proportions are output to the spatial light modulation device 230.
- the processing device 210 also calculates a new color gamut and generates a new color coordinate of the light source system 10 such as a new three primary color (R, G, B) color coordinate according to the light source brightness signal.
- a new color coordinate of the light source system 10 such as a new three primary color (R, G, B) color coordinate according to the light source brightness signal.
- the color coordinates of the original signal of each pixel of the frame image are subjected to color gamut transformation to generate a new color coordinate of each pixel.
- This new color coordinate is output to the spatial light modulation device 230, and the spatial light modulator 230 is controlled to convert the light source.
- the primary color light output by the system 10 is modulated into image light carrying image information.
- the dynamic adjustment system 221 may be divided into a light source brightness adjustment module 2210 and a dynamic color gamut compensation module 2220.
- the light source brightness adjustment module 2210 is configured to calculate the minimum brightness value of the broad-spectrum primary color light and the brightness value of the narrow-spectrum primary color light required to display the frame image according to the obtained original signal of the frame image, and generate control accordingly.
- the excitation light source 110 and the narrow-band primary color light source 120 have light source luminance signals, and output the light source brightness signal to control the excitation light source 110 and the narrow-band primary color light source 120.
- the dynamic color gamut compensation module 2220 is configured to The brightness control value and the brightness control value of the narrow-spectrum primary color light calculate a new color gamut and generate new color coordinates of the light source system 10, and use the new color coordinates of the light source system 10 to perform color gamut transformation on each pixel point of the frame image to generate each
- the control signal in the new color gamut of one pixel and the control signal in the new color gamut of each pixel are output to the spatial light modulation device 230 to control the spatial light modulation device 230 to modulate the primary color light output by the light source system 10 into a carrying image Information image light.
- the light source brightness adjustment module 2210 may be further divided into the brightest pixel point acquisition module 2211, a wide-spectrum primary color light brightness generation module 2212, a narrow-spectrum primary color light brightness generation module 2213, and a brightness signal output module 2214.
- the dynamic color gamut compensation module 2220 may be further divided into a light source new primary color generation module 2221 and a pixel new primary color generation module 2222.
- the module referred to in the present invention is a program segment capable of completing a specific function, which is more suitable for describing the execution process of the software in the display system 1 than the program. The detailed functions of each module will be combined with FIG. 3 The flowchart is described in detail.
- FIG. 3 is a flowchart of a method for dynamically adjusting a color gamut of a display system according to an embodiment of the present invention.
- the method may be implemented by using the display system 1 shown in FIG. 1, and a method of dynamically adjusting the color gamut of the display system is described in detail below with reference to the display system 1.
- the brightest pixel point obtaining module 2211 calculates the color coordinates (x, y) and brightness Y max of the pixel point A (hereinafter referred to as the “brightest pixel point A”) having the maximum brightness in a frame of an image.
- the maximum coordinate algorithm can be used to calculate the color coordinates and brightness of the brightest pixel A in a frame of image.
- the broad-spectrum primary light luminance generating module 2212 calculates the minimum brightness value of the broad-spectrum primary light according to the color coordinates and luminance of the primary-color light output from the light source system 10 and the color coordinates and brightness of the brightest pixel A.
- a brightness control value for controlling the excitation light source 110 is calculated according to the minimum brightness value of the required broad-spectrum primary color light.
- the excitation light source 110 is a blue laser
- the blue laser obtains a broad-spectrum red-green fluorescence and a narrow-spectrum blue laser after treatment
- the wide-spectrum primary color light generation module 2212 calculates The minimum brightness value of red-green fluorescence is required, and the brightness control value of the excitation light source 110 is generated according to the required minimum brightness value of red-green fluorescence, so as to control the intensity of the blue laser emitted by the excitation light source 110 and thereby control the output of the light source system 10 The intensity of red-green fluorescence and blue laser.
- the narrow-spectrum primary light luminance generation module 2213 calculates the brightness required by the brightest pixel A according to the minimum luminance value of the required broad-spectrum primary light and the color coordinates and luminance values of the brightest pixel A.
- the brightness value of the narrow-spectrum primary color light that is, the first brightness value.
- the narrow-spectrum primary-color light source 120 includes a red-green laser light source, so the narrow-spectrum primary-color light luminance generating module 2213 calculates a required brightness value of the red-green laser.
- the brightness value may be a required minimum brightness value, a required maximum brightness value, or a value between the minimum brightness value and the maximum brightness value.
- step S4 the narrow-spectrum primary-color light-brightness generating module 2213 calculates the largest color coordinate value among the color coordinates of all pixels according to the color gamut range of the frame image, that is, the color coordinates of each pixel point, and then uses the largest color
- the coordinate value calculates the brightness value of the required narrow-spectrum primary color light, that is, the second brightness value.
- the narrow-spectrum primary light luminance generating module 2213 calculates the maximum value of the x value of the corresponding primary color light red light and the maximum value of the y value of the corresponding primary color green light in all pixels, using the maximum The x value and the y value correspond to the brightness value of the red-green laser light required to calculate the narrow-spectrum primary color light source 120, that is, the second brightness value.
- the brightness value may be a required minimum brightness value, a required maximum brightness value, or a value between a minimum brightness value and a maximum brightness value.
- step S5 the narrow-spectrum primary color light generating module 2213 compares the first brightness value and the second brightness value, and calculates and controls the brightness control value of the narrow-spectrum primary light source 120 according to the greater of the first brightness value and the second brightness value.
- the brightness signal output module 2214 generates light source brightness signals of the excitation light source 110 and the narrow-spectrum primary color light source 120 according to the brightness control values of the excitation light source 110 and the brightness control value of the narrow-spectrum primary light source 120, and Output the light source brightness signal to the excitation light source 110 and the narrow-spectrum primary color light source 120 to adjust the brightness of the illumination light emitted by the excitation light source 110 and the narrow-spectrum primary color light source 120, and thus produce five primary colors of light with different proportions to be output to Spatial light modulation device 230.
- step S7 the light source new primary color generation module 2221 calculates a new color gamut and generates new color coordinates and brightness of the light source system 10 according to controlling the brightness control value of the excitation light source 110 and the brightness control value of the narrow-spectrum primary light source 120.
- step S8 the new pixel primary color generation module 2222 uses the new color coordinates and brightness of the light source system 10 to obtain the compensation matrix of the original signal of the frame image, and uses the compensation matrix to obtain the new color gamut of each pixel in the frame image. control signal.
- step S9 the pixel new primary color generation module 2222 outputs a control signal in the new color gamut of each pixel point of the frame image to the spatial light modulation device 230, thereby controlling the spatial light modulation device 230 to modulate the primary color light output by the light source system 10.
- the pixel new primary color generation module 2222 outputs a control signal in the new color gamut of each pixel point of the frame image to the spatial light modulation device 230, thereby controlling the spatial light modulation device 230 to modulate the primary color light output by the light source system 10.
- step S3a the narrow-spectrum primary color light generation module 2213 is based on the minimum luminance value of the required broad-spectrum primary light and the color of the brightest pixel A.
- the coordinates and the brightness value are used to calculate the brightness value of the narrow-spectrum primary color light when the brightness of the brightest pixel A is satisfied, and calculate and control the brightness control value of the narrow-spectrum primary color light source 120 according to the brightness value.
- the brightness value may be a required minimum brightness value, a required maximum brightness value, or a value between the minimum brightness value and the maximum brightness value.
- step S3b the narrow-spectrum primary-color light-luminance generating module 2213 calculates the largest of the color coordinates of all pixels based on the color gamut range of the frame image.
- the color coordinate value is used to calculate the brightness value of the required narrow-spectrum primary color light using the largest color coordinate value, and the brightness control value of the narrow-spectrum primary color light source 120 is calculated and controlled according to the brightness value.
- the brightness value may be a required minimum brightness value, a required maximum brightness value, or a value between the minimum brightness value and the maximum brightness value.
- RGB encoding RGB encoding
- YUV encoding RGB-encoding
- the display system needs to convert the color of the image signal from the color space of the video signal to the color space of the display system.
- RGB-encoded video signal Take an RGB-encoded video signal as an example.
- the RGB signal uses three numbers R, G, and B to define the ratio of the three primary colors of red, green, and blue.
- R, G, and B to define the ratio of the three primary colors of red, green, and blue.
- 8-bit deep-coded RGB signals are used, and each base color uses an 8-bit integer to represent the modulation depth of the three base colors. 0 means that the base color is completely off, and 255 means that the base color is displayed at the highest brightness.
- the RGB primary colors are also different.
- the RGB three primary colors specified by the REC 2020 color gamut standard are (0.708, 0.292, 0.2627), (0.17, 0.797, 0.6780), (0.131, 0.046, 0.0593) in the xyY coordinates.
- the xyY color gamut coordinates are defined by the CIE 1931 standard. You can define the three primary colors of each pixel of a frame image as:
- each pixel (r, g, b) of the frame image is converted into the CIE 1931 color space as:
- the xyY coordinate is a normalized representation of the XYZ coordinate, and the conversion relationship between the two is as follows:
- the light source system 10 In the light source system 10 to which the red-green laser is added, the light source system 10 outputs five primary color lights, and the color coordinates and brightness of the five primary color lights are defined as:
- r 0 , g 0 , b 0 , rl 0 , and gl 0 respectively represent red fluorescence, green fluorescence, blue laser, red laser, and green laser in the five primary colors of the light source.
- r 0 , g 0 and b 0 are all excited by the excitation light from the excitation light source 110, so their brightness is proportional to the output power of the excitation light source 110, the output power of the excitation light source 110 decreases, and r 0 , g 0 and The brightness of b 0 will also decrease in the same proportion. Therefore, the brightness control of r 0 , g 0 and b 0 is determined by the same brightness control amount d p .
- the three primary colors of red, green, and blue are separated in time sequence, so the brightness of r 0 , g 0, and b 0 can also be controlled separately, but high-speed light source driving is required.
- the case where the brightness of r 0 , g 0, and b 0 can be individually controlled is not involved.
- the brightness can be controlled separately, the amount corresponding to the luminance control respectively d r and d g.
- the pixels of the maximum brightness of a frame of image determine the power output of the light source system, this can ensure that all pixels can achieve the correct brightness value.
- the pixels of the maximum brightness of a frame of image can be obtained by the algorithm for obtaining the maximum value, which will not be repeated here.
- the brightest pixel A is defined as: [x max y max Y max ], and the coordinate value of the brightest pixel A in the cie 1931 color space is determined by the five primary color light sources of the light source:
- the angled XYZ value in formula (2) changes the corresponding xyY value according to formula (1).
- d p , dr and d g are corresponding brightness control amounts.
- r max, g max and b max is the highlight of the new three primary RGB color coordinates d p by d p, the d r and d g luminance control amount, d r, d g, r max, g max and b max All are unknown. Therefore, six unknowns are solved from the three equations in equation (2), and there are infinitely many sets of solutions. So consider the constraints:
- the ratio of the broad-spectrum primary color light is minimized while maintaining the brightness of the brightest pixel A, that is, the ratio of the red-green fluorescence is minimized in this embodiment, that is, min (d p ) that satisfies the above-mentioned limitation.
- d p can be expressed as:
- D p can be calculated by using formula (3), and the minimum values of d r and d g can be calculated by taking formula (2).
- d p the minimum brightness value of red and green fluorescence can be obtained and the red and green fluorescence can be calculated accordingly
- d r and d g the minimum brightness value (first brightness value) of the red-green laser can be obtained and the brightness control value of the red-green laser can be calculated accordingly.
- D r and d g can take the minimum value. To save energy.
- the dynamically calculated color gamut will be used to compensate for the color of the image picture, so that the correct color can be obtained in the new color gamut obtained by the picture through the new light source ratio.
- a new color gamut can be calculated according to the brightness control value corresponding to each primary color of the light source system 10.
- the color gamut is determined by the color coordinates and brightness of the primary color light corresponding to each color component that can be modulated by the spatial light modulation device 230.
- the spatial light modulator is divided into three timings to process the red, green, and blue primary colors, respectively.
- the color gamut that the display system 1 can represent is the color coordinates and brightness of the illumination light emitted by the light source system 10 in the three timings. . If one or some of the color timings are illumination light synthesized from multiple primary color lights, the primary color light representing the color gamut within the color timing is determined by the total color coordinates and the total degree of the synthesized primary color light.
- the red color timing includes red fluorescence with a relative peak luminance of a% and red laser light with a relative peak luminance of b%.
- the primary color light determined by the red color timing is composed of a% red fluorescence and b%.
- the color coordinates and brightness of the illumination light after the red laser light is mixed are determined. Therefore, according to the brightness values and color coordinates of the respective primary colors output by the light source system 10, the new three primary color RGB color coordinates after mixing by the light source system 10 can be obtained.
- the compensation matrix is determined by the following method:
- CIE 1937 defines a three-dimensional vector as the absolute color and brightness of any color that can be distinguished by the human eye. It does not change with the change of color gamut.
- the three primary colors of display system 1 satisfy the following formula:
- the brightness of the three primary colors displayed by the display system 1 must satisfy:
- the relationship between the color gamut space of the original signal of the input image and the three primary color modulation signals of the display system 1 can be defined as:
- C ′ is a 4x3 or 5x3 matrix, and the determinant value of the pseudo inverse matrix is zero, so there are infinitely many solutions for the conversion from XYZ space to the primary color space.
- C ′ -1 is a conversion matrix from XYZ to the primary color space.
- This transformation matrix can be solved by adding a constraint, such as maximizing white light in a light source system using a four-segment color wheel RGBW, and evenly distributing the brightness of the primary colors as much as possible.
- Accurately measuring the color coordinates and brightness values of each primary color light of the display system 1 to generate accurate C ′ is the basis for ensuring the accurate color display of the display system 1.
- the panel control chips provided by the existing mainstream display panel (that is, spatial light modulation device) suppliers have integrated color management modules such as color gamut conversion and gamma correction to perform color management functions, these color management modules use registers to store color transformation matrices.
- the color signal input at each pixel is converted to the color space of the display system by using the color conversion matrix. Therefore, in this embodiment, the improvement of the existing mainstream display system can be reached in one frame of image. Perform dynamic color gamut compensation on the frame image before the panel control chip.
- the color conversion matrix recorded in the panel control chip can be set to:
- C ′ is a transformation matrix from rgb space to XYZ space in the three primary colors recorded by the panel control chip
- C is a transformation matrix for converting the original signal of the input video or image to XYZ space.
- C is the conversion matrix corresponding to the color gamut change of the original image signal
- C ′ is the color gamut conversion matrix recorded in the panel control chip
- C ′′ is the conversion matrix of the dynamic new color gamut, that is, the compensation matrix. It is the signal input to the panel control chip after compensation.
- the light source system 10 may be configured to emit only four primary colors of illumination light, such as only red fluorescence r, green fluorescence g, blue laser b, red laser r 'or only red fluorescence r, green fluorescence g, blue laser b, green laser g'.
- the primary color light output by the excitation light from the excitation light source 110 of the light source system 10 after treatment may include only one broad-spectrum primary color light, such as red fluorescence or green fluorescence.
- the system, method, and display system for dynamically adjusting the display system provided by the embodiments of the present invention, on the one hand, use excitation light with better monochromaticity and broad-spectrum fluorescence to synthesize new primary color light, thereby expanding the color of the display system.
- the minimum brightness of the broad-spectrum primary color light is calculated according to the brightness of the brightest pixel point of the image screen, and the brightness value of the broad-spectrum primary light is optimized while maintaining the screen brightness, so that the color gamut of the screen can Expand to the maximum value; at the same time, calculate the new color coordinates of the light source system based on the modulated base color illumination brightness, calculate the compensation matrix of the original signal of the frame image based on the new color coordinates of the light source system, and use the compensation matrix to compensate the original of the frame image
- the signal is used to generate a control signal for each pixel of the compensated image, which is used to control the output of the spatial light modulation device, so as to dynamically compensate the color difference of each frame image due to the color gamut change according to the different images of each frame.
- the system, method, and display system for dynamically adjusting the color gamut of the display system provided in the embodiments of the present invention, while significantly enhancing the color gamut of the display system (enhancing the color gamut to reach the REC2020 color gamut standard), while maintaining a high efficiency of the display system And reduce chromatic aberration.
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Abstract
一种动态调节显示***色域的***(221)、方法及显示***(1),显示***(1)包括光源***(10)与成像***(20),光源***(1)包括激发光光源(110)与窄光谱基色光光源(120),激发光光源(110)发出激发光经由处置后输出至少一种宽光谱基色光,窄光谱基色光光源(120)输出至少一种窄光谱基色光,窄光谱基色光与宽光谱基色光合光后输出至成像***(20),方法包括:计算一帧图像最亮像素点的色坐标与亮度(S1);根据光源***(10)基色光与最亮像素点二者的色坐标与亮度计算宽光谱基色光的最小亮度值(S2);计算窄光谱基色光的亮度值(S3-S5);根据亮度值生成并输出激发光光源(110)与窄光谱基色光光源(120)的光源亮度信号(S6),以调节激发光光源(110)与窄光谱基色光光源(120)发出光的亮度(S7)。增强色域的同时提高了效率、降低了成本。
Description
本发明涉及显示***,尤其涉及动态调节显示***色域的投影***、方法及显示***。
一种基本的激光荧光光源中,由激光发出的短波长可见光激发波长转换装置上的荧光粉以产生时序的荧光基色光或白光,然由于荧光的频谱较宽,使得此光源的色域覆盖较窄。另一种改进的激光荧光光源中,激光发出的短波长可见光通过波长转换装置转换成基色光并通过同步滤光器件滤波获得窄带且色纯度更高的基色光以扩展激光荧光的色域,然在此种方案中,滤光器件会带来额外的光功率损失,使利用此光源的效率降低。
在激光荧光光源***的进一步改进中,激光荧光中被掺入纯色的红绿激光以扩展光源的色域,此种方案请参考公开号为20150316775A1的美国专利申请以及申请号为201110191454.8的中国专利。虽然掺入纯色激光能够扩展激光荧光的色域,但是没有涉及将光源应用于显示***中时,针对显示内容对光源配比进行调制,因此所能增强的色域范围有限,此外,若需将激光荧光的色域扩展到DCI-P3标准,需要加入相当于荧光亮度40%的纯色激光,因此需要加入大功率的红绿激光,导致***成本大大增加。
为扩展色域,另一种是方式是在加入足量的红、绿激光的基础上,通过滤光器件提高红绿荧光的色彩饱和度,能够将荧光和激光合成满足rec2020标准色域的基色光,然这种方式除成本高外,还大大降低了效率(红绿荧光典型的比例在30%左右,从而降低了***大概30%朝上的效率)。
发明内容
鉴于上述状况,本发明提供一种动态调节显示***色域的投影***、方法及显示***,以解决扩大色域时导致的成本升高与效率降低等问题。
一方面,本发明提供一种动态调节显示***色域的***,所述显示***包括光源***与成像***,所述光源***包括激发光光源与窄光谱基色光光源,所述激发光光源发出激发光,所述激发光经由处置后输出的基色光中包含至少一种宽光谱基色光,所述窄光谱基色光光源输出至少一种窄光谱的基色光,所述窄光谱基色光与对应的宽光谱基色光合光后输出至所述成像***,所述成像***包括处理装置、存储装置及空间光调制装置,所述动态调节显示***色域的***存储于所述存储装置中并由所述处理装置执行,所述动态调节显示***色域的***包括光源亮度调节模块,所述光源亮度调节模块包括:最亮像素点获取模块,用于计算一帧图像的最亮像素点的色坐标与亮度;宽光谱基色光亮度生成模块,用于根据所述光源***输出的基色光的色坐标与亮度以及最亮像素点的色坐标与亮度,计算所需宽光谱基色光的最小亮度值,并根据所需宽光谱基色光的最小亮度值计算控制所述激发光光源的亮度控制值;窄光谱基色光亮度生成模块,用于根据所需宽光谱基色光的最小亮度值,计算所需窄光谱基色光的最小亮度值,并根据所需窄光谱基色光的亮度值计算控制所述窄光谱基色光光源的亮度控制值;及亮度信号输出模块,用于根据宽光谱基色光的亮度控制值以及窄光谱基色光的亮度控制值对应生成所述激发光光源与窄光谱基色光光源的光源亮度信号,并输出所述光源亮度信号至所述激发光光源与窄光谱基色光光源,以调节所述激发光光源与窄光谱基色光光源发出光的亮度。
另一方面,本发明还提供一种动态调节显示***色域的方法,所述显示***包括光源***与成像***,所述光源***包括激发光光源与窄光谱基色光光源,所述激发光光源发出激发光,所述激发光经由处置后输出的基色光中包 含至少一种宽光谱基色光,所述窄光谱基色光光源输出至少一种窄光谱基色光,所述窄光谱基色光与对应的宽光谱基色光合光后输出至所述成像***,所述成像***包括空间光调制装置,所述方法包括:计算一帧图像的最亮像素点的色坐标与亮度;根据所述光源***输出的基色光的色坐标与亮度以及最亮像素点的色坐标与亮度,计算所需宽光谱基色光的最小亮度值,并根据所需宽光谱基色光的最小亮度值计算控制所述激发光光源的亮度控制值;根据所需宽光谱基色光的最小亮度值,计算所需窄光谱基色光的亮度值,并根据所需窄光谱基色光的亮度值计算控制所述窄光谱基色光光源的亮度控制值;及根据控制所述激发光光源的亮度控制值以及控制所述窄光谱基色光光源的亮度控制值对应生成所述激发光光源与窄光谱基色光光源的光源亮度信号,并输出所述光源亮度信号至所述激发光光源与窄光谱基色光光源,以调节所述激发光光源与窄光谱基色光光源发出光的亮度。
第三方面,本发明还提供一种显示***,所述显示***包括光源***与成像***,所述光源***包括激发光光源与窄光谱基色光光源,所述激发光光源发出激发光,所述激发光经由处置后输出的基色光中包含至少一种宽光谱基色光,所述窄光谱基色光光源输出至少一种窄光谱基色光,所述窄光谱基色光与对应的宽光谱基色光合光后输出至所述成像***,所述成像***包括上述的动态调节显示***色域的***及空间光调制装置。
本发明实施例提供的动态调节显示***的***、方法及显示***,一方面利用单色性更好的激发光来和宽光谱荧光合成新的基色光,从而扩大显示***的色域;另一方面,根据图像画面最亮像素点的亮度计算所需宽光谱基色光的最小亮度,在保持了画面亮度的情况下最小化宽光谱基色光的亮度值,使显示***的色域能够扩展至最大值;同时,根据调制后的基色照明光亮度计算光源***新的色坐标,根据光源***新的色坐标计算该帧图像的原始信号的补偿矩阵,并用补偿矩阵补偿该帧图像的原始信号以生成图像每一像素补偿后的图像信号,用以控制空间光调制装置的输出,从而根据每帧图像的不同相应补偿每帧图像由于色域变化产生的色差。因此,本发明实施方式中提供的动态 调节显示***色域的***、方法及显示***,在显著增强显示***色域(如:增强显示***色域至REC2020色域标准)的同时保持显示***较高的效率、并降低色差。
图1是本发明一实施方式中的动态调节显示***色域的显示***的结构示意图。
图2是本发明一实施方式的动态调节显示***色域的***的模组图。
图3是本发明第一实施方式的动态调节显示***色域的方法流程图。
图4是本发明第二实施方式的动态调节显示***色域的方法流程图。
图5是本发明第三实施方式的动态调节显示***色域的方法流程图。
为使本发明的上述目的、特征和优点能够更明显易懂,下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,为使描述简要清晰,同一元件或相似元件在以下不同实施方式中采用相同编号。显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
除非另有定义,本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文所使用的术语“或/及”包括一个或多个相关的所列项目的任意的和所有的组合。
请参阅图1所示,为本发明一种实施方式中的显示***的构成示意图,所述显示***1包括光源***10与成像***20。其中光源***10包括激发光光源110、窄光谱基色光光源120、波长转换与合光装置130。其中,激发光光源110发出的短波长激发光被引导至波长转换与合光装置130,被波长转换与合光装置130吸收并产生宽光谱的基色光,窄光谱基色光光源120发 出的窄光谱基色光被引导至波长转换与合光装置130,在波长转换与合光装置130处与宽光谱的基色光进行合光。在本实施方式中,激发光光源110为蓝激光光源,所发出的激发光为蓝激光,波长转换与合光装置130上分区域设置波长转换材料与散射材料,其中波长转换材料包括红光荧光粉材料与绿光荧光粉材料,为便于说明,设置红光荧光材料的区域称之为“红光区”,设置绿光荧光材料的区域称之为“绿光区”,而设置散射材料的区域称之为“蓝光区”。红光区、绿光区与蓝光区轮流切入激发光的出射路径,从而在波长转换与合光装置130处出射红荧光、绿荧光与蓝激光三种基色光。在本实施方式中,窄光谱基色光光源120包括红激光光源与绿激光光源,红激光光源与绿激光光源按照时序发出红激光与绿激光两种基色光,其中红激光被引导至波长转换与合光装置130处与红荧光进行合光,绿激光被引导至波长转换与合光装置130处于绿荧光进行合光。因此光源***10最终输出红、绿、蓝三基色照明光至成像***20。
为便于描述,在本发明实施方式中,光源***10输出的红光R、绿光G、蓝光G被称为光源三基色光,对应至由此三基色光去实现显示的图像数据,所述图像数据的每一像素点可由此三基色去表示,即P(r,g,b)。光源***10输出的红荧光r、绿荧光g、蓝激光b、红激光r’、绿激光b’被称为光源五基色光,对应至由此五基色光去实现显示的图像数据,所述图像数据的每一像素点亦可由此五基色去表示,即P(r,g,b,r’,b’)。在下面还会出现诸如光源***10的三基色色坐标及亮度、光源***10的五基色色坐标及亮度、像素三基色色坐标及亮度、像素五基色色坐标及亮度之类的描述,其中光源***10的三基色色坐标及亮度是指光源***10输出的红光R、绿光G、蓝光G三基色光在某一色彩空间下的色坐标及亮度,像素三基色色坐标及亮度是指一帧图像中每一像素在某一色彩空间下的三基色色坐标及亮度,光源***10的五基色色坐标及亮度是指光源***10输出的红荧光r、绿荧光g、蓝激光b、红激光r’、绿激光b’五基色光在某一色彩空间下的色坐标及亮度,像素五基色色坐标及亮度是指一帧图像中每一像素在某一色彩空间下的五基色色坐标及亮度。
在上述实施方式中,将激发光、窄光谱基色光引导至波长转换与合光装置130的方式、以及将基色光从波长转换与合光装置130处引导至成像***20的方式可以参考现有技术,在此不作介绍。
可以理解,在其他实施方式中,波长转换与合光装置130可以分离成波长转换装置与合光装置两个装置,二者可以邻近也可隔开设置,在此不作限定。
可以理解,光源***10还可以包括滤光装置,滤光装置可以与波长转换与合光装置130设置为一体或分开设置,在此不作限定。
可以理解,在其他实施方式中,光源***10也可先产生蓝光与黄荧光,再由黄荧光中过滤出红荧光与绿荧光。
可以理解,无论如何,光源***10包括激发光光源110与窄光谱基色光光源120,激发光光源110发出的激发光经由处置,例如经由波长转换、过滤或散射诸如此类的操作后输出蓝光以及宽光谱的红、绿光,所述窄光谱基色光光源120输出至少一种窄光谱的基色光,所述至少一种窄光谱的基色光为窄光谱的红光及/或绿光,所述蓝光、宽光谱的红绿光以及窄光谱的红光及/或绿光构成光源多于三基色的多基色光,所述窄光谱基色光与对应的宽光谱的基色光合光,以使所述光源***输出红、绿、蓝三基色光至所述成像***,所述红、绿、蓝三基色光构成光源三基色光。
所述成像***20包括处理装置210、存储装置220与空间光调制装置230。所述处理装置210电连接存储装置220、空间光调制装置230以及一图像源30。所述处理装置210从所述图像源30接收图像信号,所述空间光调制装置230在所述处理装置210的控制下,将光源***10输出的基色光调制成携带图像信息的图像光,所述图像光经由投影镜头240输出投影至屏幕(图未示)上形成图像。
本实施方式中,动态调节显示***色域的***221(以下简称为“动态调节***221”)安装并运行于所述成像***20中,具体地,所述动态调节***221可以被分割成一个或多个模块,所述一个或多个模块存储在所述存储装置 220中,并由所述处理装置210执行,从而根据显示***1的显示内容动态调节显示***1的色域。进一步地,所述处理装置210从图像源30处实时获得图像的原始信号,针对具体一帧图像,所述处理装置210运行所述动态调节***221,根据获得的原始信号计算显示该帧图像所需的宽光谱基色光的最小亮度值以及所需的窄光谱基色光的最小亮度值、并相应产生控制激发光光源110与窄光谱基色光光源120的光源亮度信号,光源亮度信号被输出至一伽马校正器40,经伽马校正器40进行校正后输出至激发光光源110与窄光谱基色光光源120,以调节激发光光源110与窄光谱基色光光源120发出的照明光的亮度,从而产生不同比例的五基色光输出至空间光调制装置230。在此基础上,所述处理装置210另还根据光源亮度信号计算新的色域并生成光源***10新的色坐标如新的三基色(R,G,B)色坐标,利用光源***10新的色坐标对该帧图像每一像素点的原始信号进行色域变换以生成每一像素新的色坐标,此新的色坐标被输出至空间光调制装置230,控制空间光调制器230将光源***10输出的基色光调制成携带图像信息的图像光。
请参阅图2所示,所述动态调节***221可以被分割成光源亮度调节模块2210与动态色域补偿模块2220。所述光源亮度调节模块2210用于根据获得的一帧图像的原始信号计算显示该帧图像所需的宽光谱基色光的最小亮度值以及所需的窄光谱基色光的亮度值、并相应产生控制激发光光源110与窄光谱基色光光源120的光源亮度信号、并输出光源亮度信号控制激发光光源110与窄光谱基色光光源120,所述动态色域补偿模块2220用于根据宽光谱基色光的亮度控制值以及窄光谱基色光的亮度控制值计算新的色域并生成光源***10新的色坐标、利用光源***10新的色坐标对该帧图像每一像素点进行色域变换以生成每一像素点新色域下的控制信号、及输出每一像素点新色域下的控制信号至空间光调制装置230,以控制空间光调制装置230将光源***10输出的基色光调制成携带图像信息的图像光。所述光源亮度调节模块2210可进一步被分割成最亮像素点获取模块2211、宽光谱基色光亮度生成模块2212、窄光谱基色光亮度生成模块2213及亮度信号输出模块2214。所述动态色域补偿模块2220可进一步被分割为光源新基色生成模块2221与像素新基色生成模块2222。在此需申明的是,本发明所称的模块是能够完成 一特定功能的程序段,比程序更适合用于描述软件在显示***1中的执行过程,关于各模块的详细功能将结合图3的流程图作具体描述。
请参阅图3所示,为本发明一实施方式中的动态调节显示***色域的方法流程图。所述方法可以利用图1所示的显示***1来实现,以下结合显示***1来对动态调节显示***色域的方法进行详细描述。
首先,在步骤S1中,最亮像素点获取模块2211计算一帧图像的亮度最大的像素点A(下称“最亮像素点A”)的色坐标(x,y)与亮度Y
max。具体地,利用求最大值的算法可以计算得出一帧图像中最亮像素点A的色坐标与亮度。
在步骤S2中,宽光谱基色光亮度生成模块2212根据光源***10输出的基色光的色坐标与亮度以及最亮像素点A的色坐标与亮度,计算所需宽光谱基色光的最小亮度值,并根据所需宽光谱基色光的最小亮度值计算控制激发光光源110的亮度控制值。
具体在一实施方式中,所述激发光光源110为蓝激光,所述蓝激光经由处置后获得宽光谱的红绿荧光与窄光谱的蓝激光,所述宽光谱基色光亮度生成模块2212计算所需红绿荧光的最小亮度值,并根据所需红绿荧光的最小亮度值生成激发光光源110的亮度控制值,从而控制激发光光源110发出蓝激光的强度并以此控制光源***10输出的红绿荧光与蓝激光的强度。
在步骤S3中,窄光谱基色光亮度生成模块2213根据所需宽光谱基色光的最小亮度值以及最亮像素点A的色坐标和亮度值,计算满足最亮像素点A的亮度时,所需窄光谱基色光的亮度值,即第一亮度值。
具体在一实施方式中,窄光谱基色光光源120包括红绿激光光源,因此窄光谱基色光亮度生成模块2213计算所需红绿激光的亮度值。进一步地,作为一种实施方式,所述亮度值可以是所需的最小亮度值,也可以是所需的最大亮度值,或者,是处于最小亮度值与最大亮度值之间的一个值。
在步骤S4中,窄光谱基色光亮度生成模块2213根据该帧图像的色域范围,即每一像素点的色坐标,计算所有像素点的色坐标中最大的色坐标值,再利用最大的色坐标值计算所需窄光谱基色光的亮度值,即第二亮度值。具体 地,在一实施方式中,窄光谱基色光亮度生成模块2213计算所有像素点中对应基色光红光的x值的最大值、以及对应基色光绿光的y值的最大值,利用最大的x值和y值对应计算窄光谱基色光光源120所需发出的红绿激光的亮度值,即第二亮度值。同样,作为一种实施方式,所述亮度值可以是所需的最小亮度值,也可以是所需的最大亮度值,或者,是处于最小亮度值与最大亮度值之间的一个值。
步骤S5中,窄光谱基色光亮度生成模块2213比较第一亮度值与第二亮度值,根据第一亮度值与第二亮度值中较大者计算控制窄光谱基色光光源120的亮度控制值。
步骤S6中,亮度信号输出模块2214根据控制激发光光源110的亮度控制值以及控制窄光谱基色光光源120的亮度控制值对应生成激发光光源110与窄光谱基色光光源120的光源亮度信号,并输出所述光源亮度信号至激发光光源110与窄光谱基色光光源120,以调节激发光光源110与窄光谱基色光光源120发出的照明光的亮度,并因此产生不同比例的五基色光输出至空间光调制装置230。
步骤S7中,光源新基色生成模块2221根据控制激发光光源110的亮度控制值以及控制窄光谱基色光光源120的亮度控制值、计算新的色域并生成光源***10新的色坐标和亮度。
步骤S8中,像素新基色生成模块2222利用光源***10新的色坐标和亮度求得该帧图像原始信号的补偿矩阵,并利用补偿矩阵求得该帧图像的每一像素点新色域下的控制信号。
步骤S9中,像素新基色生成模块2222输出该帧图像的每一像素点新色域下的控制信号至空间光调制装置230,以此控制空间光调制装置230将光源***10输出的基色光调制成携带图像信息的图像光。
在另一实施方式中,上述步骤S3-S5也可由步骤S3a来替代,步骤S3a中,窄光谱基色光亮度生成模块2213根据所需宽光谱基色光的最小亮度值以及最亮像素点A的色坐标和亮度值,计算满足最亮像素点A的亮度时,所需窄光 谱基色光的亮度值,并根据所述亮度值计算控制所述窄光谱基色光光源120的亮度控制值。在一种实施方式中,所述亮度值可以是所需的最小亮度值,也可以是所需的最大亮度值,或者,是处于最小亮度值与最大亮度值之间的一个值。
在再一实施方式中,上述步骤S3-S5也可由步骤S3b来替代,步骤S3b中,窄光谱基色光亮度生成模块2213根据该帧图像的色域范围,计算所有像素点的色坐标中最大的色坐标值,再利用最大的色坐标值计算所需窄光谱基色光的亮度值,并根据所述亮度值计算控制所述窄光谱基色光光源120的亮度控制值。在一种实施方式中,所述亮度值可以是所需的最小亮度值,也可以是所需的最大亮度值,或者,是处于最小亮度值与最大亮度值之间的一个值。
下面将详细描述本实施方式中生成光源亮度信号与针对一帧图像每一像素点的动态色域调节的算法。
由于一帧图像根据编码格式的不同采用不同的颜色空间,比较常用的颜色空间包括RGB编码和YUV编码。显示***需要将图像信号的色彩从视频信号的颜色空间转换到显示***的颜色空间。以RGB编码的视频信号为例。RGB信号用R,G,B三个数字定义了红绿蓝三基色的比例。一般采用8bit位深编码的RGB信号,每一个基色用8bit的整数表示三个基色的调制深度。0代表该基色完全关闭,255表示该基色以最高亮度显示。根据视频信号选取的色域不同,RGB基色也不同。例如REC 2020色域标准规定的RGB三基色在xyY坐标下分别为(0.708,0.292,0.2627),(0.17,0.797,0.6780),(0.131,0.046,0.0593)。xyY色域坐标以CIE 1931标准定义。则可以定义一帧图像每一像素点的三基色表示为:
则将该帧图像每一像素点(r,g,b)转换到CIE 1931颜色空间中为:
其中:
其中xyY坐标为XYZ坐标的归一化表示,这两者之间的转换关系如下:
在加入了红绿激光的光源***10中,光源***10输出五个基色光,其中五个基色光色坐标与亮度定义为:
其中r
0,g
0,b
0,rl
0,和gl
0分别代表光源五基色光中的红荧光,绿荧光,蓝激光,红激光和绿激光。r
0、g
0和b
0都是由激发光光源110发出的激发光激发,因而其亮度都正比于激发光光源110的输出功率,激发光光源110的输出功率降低,r
0、g
0和b
0的亮度也会按着相同的比例降低。因而r
0、g
0和b
0的亮度控制由同一个亮度控制量d
p决定。在单片式投影***中,红、绿、蓝三基色在时序上分开,因而r
0、g
0和b
0的亮度也能够被分别控制,但是需要高速的光源驱动。在本实施方式中,暂不涉及r
0、g
0和b
0的亮度能够被单独控制的情况。而对于窄光谱基色光光源120发出的红激光rl
0和绿激光gl
0,其亮度分别可以被控制,对应的亮度控制量分别为d
r和d
g。
由于一帧图像其最大亮度的像素点决定了光源***所需输出的功率,这样才能保证所有像素点都能实现正确的亮度值。一帧图像的最大亮度的像素点可以通过求最大值的算法得出,在此不作赘述。
将最亮像素点A定义为:[x
max y
max Y
max],所述最亮像素点A在cie 1931色彩空间下的坐标值由光源五基色光混合决定:
其中式(2)中带角标的XYZ值为对应的xyY值根据式(1)的变化。d
p、d
r和d
g为对应的亮度控制量。r
max,g
max和b
max为最亮点在由d
p,d
r和d
g亮度控制量下的新的三基色RGB色坐标d
p,d
r,d
g,r
max,g
max和b
max皆为未知数。由此,由式(2)中三个方程求解六个未知数,有无穷多组解。因此考虑限制条件:
r
max∈[0,1]
g
max∈[0,1]
b
max∈[0,1]
d
p∈[0,1]
d
r∈[0,1]
d
g∈[0,1]
求保持最亮像素点A的亮度下最小化宽光谱基色光比例,即本实施方式中最小化红绿荧光的比例,即求满足上述限制条件下的min(d
p)。
将式(2)消元后,d
p可以表示为:
其中:
A=(X
maxY
rl-X
rlY
max)(Z
glY
rl-Z
rlY
gl)-(X
glY
rl-X
rlY
gl)(Z
maxY
rl-Z
rlY
max)
B=(X
rY
rl-X
rlY
r)(Z
glY
rl-Z
rlY
gl)-(Z
rY
rl-Z
rlY
r)(X
glY
rl-X
rlY
gl)
C=(X
gY
rl-X
rlY
g)(Z
glY
rl-Z
rlY
gl)-(Z
gY
rl-Z
rlY
g)(X
glY
rl-X
rlY
gl)
D=(X
bY
rl-Y
bX
rl)(Z
glY
rl-Z
rlY
gl)-(Z
bY
rl-Z
rlY
b)(X
glY
rl-X
rlY
gl)
min(dp)等价于max(Br
max+Cg
max+Db
max),而式(3)的分母为线性函数,所以当式(3)分母取最大值时
利用式(3)可以计算出d
p,从而带入式(2)可以计算出d
r和d
g的最小值,根据d
p即可获得红绿荧光的最小亮度值并相应计算出红绿荧光的亮度控制值,根据d
r和d
g即可获得红绿激光的最小亮度值(第一亮度值)并相应计算出红绿激光的亮度控制值,d
r和d
g可以取该最小值,以节省能源。在其他实施方式中,根据需要,也可以令d
r=1和d
g=1来获得最大的色域。还可以根据该帧图像的色域统计计算出最大的色域包络来求得红绿激光的最小亮度值(第二亮度值),并通过与第一亮度值比较取最大值以获得最后的红绿激光的亮度控制值。在已知红绿荧光和红绿激光的亮度控制值后,可以计算出光源***10新的色域为:
动态计算出的色域将用于图像画面色彩的补偿以使得画面通过新的光源配比而得到的新色域中获得正确的色彩。
具体地,根据对应光源***10每一基色的亮度控制值,可以计算新的色域。色域由可以被空间光调制装置230调制的各个色彩分量对应的基色光色坐标和亮度决定。例如,空间光调制器分为三个时序分别处理红绿蓝三基色 光,则该显示***1能够表示的色域即为三个时序中的光源***10发出的照明光的色坐标和亮度决定。如果其中的某个或某些色彩时序是由多个基色光合成的照明光,则该色彩时序内表征色域的基色光由合成基色光的总色坐标和总量度决定。例如在一帧图像中,红色色彩时序内有相对峰值亮度a%的红荧光和相对峰值亮度b%的红激光组成,则该红色色彩时序决定的基色光由a%的红荧光和b%的红激光混合后的照明光的色坐标和亮度决定。因而根据光源***10输出的各个基色光亮度值和色坐标,可以求得光源***10混合后的新的三基色RGB色坐标。
再利用光源***10新的色坐标和亮度求得该帧图像原始信号的补偿矩阵,并利用补偿矩阵求得该帧图像画面的每一像素点的新的色坐标、即每一像素点新色域下的控制信号。在本实施方式中,求补偿矩阵由如下所述的方法确定:
CIE 1937以一个三维向量定义了任意人眼可以分辨的绝对颜色和颜色的亮度。其不随色域的变换而变换。显示***1的三基色满足如下公式:
要在显示***1下显示图像原始信号所表示的颜色,需要显示***1显示的三基色的亮度满足:
这样,可以定义从输入的图像的原始信号的色域空间到显示***1的三基色调制信号之间的关系为:
这里仅以三基色***为例来阐述色彩转换的原理。对于使用四基色或五基色的投影***,C′为4x3或5x3的矩阵,其伪逆矩阵的行列式值为零,因而从XYZ空间到基色空间的转换有无穷多解。C′
-1为XYZ到基色空间的一转换矩阵。这个转换矩阵可以由加入的一限制条件求解,比如在采用四段式色轮RGBW的光源***中最大化白光,尽量平均分配基色亮度等。对显示***1色彩的校准,也就是对C′的校准。准确的测量显示***1各基色光的色坐标和亮度值,以生成准确的C′是保障显示***1色彩显示准确的基础。
由于现有主流显示面板(即空间光调制装置)供应商提供的面板控制芯片都集成了色域转换、gamma校正等色彩管理模块执行色彩管理功能,这些色彩管理模块利用寄存器存储色彩变换矩阵,对每一像素点输入的彩色信号,利用色彩变换矩阵将输入信号的色彩空间转换为显示***的色彩空间,因此,在本实施方式中,对现有主流显示***的改进,可以在一帧图像到达面板控制芯片前对该帧图像执行动态色域补偿,其中,面板控制芯片中记录的色彩转换矩阵可以设为:
T=C′
-1C
其中C′为面板控制芯片记录的三基色下从rgb空间到XYZ空间的变换矩阵,C为输入的视频或图像的原始信号转换到XYZ空间的变换矩阵。当光源***10的荧光和激光根据光源亮度信号调制以后,为使经过面板控制芯片转换后的rgb值满足新的动态生成的色域的合成和维持色彩不变,亦即色彩的XYZ坐标不变,这样可以得到输入给面板控制芯片的信号需要在原输入信号、即原始信号的基础上变换为:
其中,C是图像原始信号色域变化对应的转换矩阵,C′是面板控制芯片里记录的色域转换矩阵,C″是动态新色域的转换矩阵,即补偿矩阵,
为输入给面板控制芯片经过补偿后的信号。利用上式,可以保证光源***10经过调制导致的色域变化情况下,显示***1显示的色彩不发生变化。
可以理解,虽然上述实施方式仅以光源***10发出五基色照明光为例,然在其他实施方式中,光源***10也可以设置为仅发出四基色照明光,如仅发出红荧光r、绿荧光g、蓝激光b、红激光r’或者仅发出红荧光r、绿荧光g、蓝激光b、绿激光g’。更进一步地,根据特定情况下的需求,光源***10的激发光光源110发出的激发光经由处置后输出的基色光中可以只包含一种宽光谱基色光,如红荧光或绿荧光等。
综上所述,本发明实施方式提供的动态调节显示***的***、方法及显示***,一方面利用单色性更好的激发光和宽光谱荧光合成新的基色光,从而扩大显示***的色域;另一方面,根据图像画面最亮像素点的亮度计算所需宽光谱基色光的最小亮度,在保持了画面亮度的情况下最优化宽光谱基色光的亮度值,使画面的色域能够扩展至最大值;同时,根据调制后的基色照明光亮度计算光源***新的色坐标,根据光源***新的色坐标计算该帧图像的原始信号的补偿矩阵,并用补偿矩阵补偿该帧图像的原始信号以生成补偿后的图像每一像素点的控制信号,用以控制空间光调制装置的输出,从而根据每帧图像的不同动态补偿每帧图像由于色域变化产生的色差。因此,本发明实施方式中提供的动态调节显示***色域的***、方法及显示***,在显著增强显示*** 色域(增强色域至达到REC2020色域标准)的同时保持显示***较高的效率、并降低色差。
以上实施方式仅用以说明本发明的技术方案而非限制,尽管参照以上较佳实施方式对本发明进行了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或等同替换都不应脱离本发明技术方案的精神和范围。
Claims (17)
- 一种动态调节显示***色域的***,其特征在于,所述显示***包括光源***与成像***,所述光源***包括激发光光源与窄光谱基色光光源,所述激发光光源发出激发光,所述激发光经由处置后输出的基色光中包含至少一种宽光谱基色光,所述窄光谱基色光光源输出至少一种窄光谱的基色光,所述窄光谱基色光与对应的宽光谱基色光合光后输出至所述成像***,所述成像***包括空间光调制装置及所述动态调节显示***色域的***,所述动态调节显示***色域的***包括:光源亮度调节模块,所述光源亮度调节模块进一步包括:最亮像素点获取模块,用于计算一帧图像最亮像素点的色坐标与亮度;宽光谱基色光亮度生成模块,用于根据所述光源***输出的基色光的色坐标与亮度以及最亮像素点的色坐标与亮度,计算所需宽光谱基色光的最小亮度值,并根据所述最小亮度值计算控制所述激发光光源的亮度控制值;窄光谱基色光亮度生成模块,用于根据所需宽光谱基色光的最小亮度值,计算所需窄光谱基色光的亮度值,并根据所需窄光谱基色光的亮度值计算控制所述窄光谱基色光光源的亮度控制值;及亮度信号输出模块,用于根据宽光谱基色光的亮度控制值以及窄光谱基色光的亮度控制值对应生成所述激发光光源与窄光谱基色光光源的光源亮度信号,并输出所述光源亮度信号至所述激发光光源与窄光谱基色光光源,以调节所述激发光光源与窄光谱基色光光源发出光的亮度。
- 如权利要求1所述的***,其特征在于,还包括一动态色域补偿模块,用于根据控制所述激发光光源的亮度控制值以及控制所述窄光谱基色光光源 的亮度控制值计算新的色域并生成所述光源***新的色坐标、利用所述光源***新的色坐标对该帧图像每一像素点进行色域变换以生成每一像素点新色域下的控制信号至所述空间光调制装置,以控制所述空间光调制装置将所述光源三基色光调制成携带图像信息的图像光。
- 如权利要求2所述的***,其特征在于,所述窄光谱基色光亮度生成模块进一步用于根据所需宽光谱基色光的最小亮度值以及最亮像素点的色坐标和亮度值,计算满足最亮像素点的亮度时,所需窄光谱基色光的亮度值,并根据所需窄光谱基色光的亮度值计算所述窄光谱基色光光源的亮度控制值。
- 如权利要求2所述的***,其特征在于,所述窄光谱基色光亮度生成模块进一步用于根据该帧图像的色域范围,计算所有像素点的色坐标中最大的色坐标值,再利用最大的色坐标值计算所需窄光谱基色光的亮度值,并根据所需窄光谱基色光的亮度值计算所述窄光谱基色光光源的亮度控制值。
- 如权利要求2所述的***,其特征在于,窄光谱基色光亮度生成模块进一步用于根据所需宽光谱基色光的最小亮度值以及最亮像素点的色坐标和亮度值,计算满足最亮像素点的亮度时,所需窄光谱基色光的第一亮度值,根据该帧图像的色域范围,计算所有像素点的色坐标中最大的色坐标值,再利用最大的色坐标值计算所需窄光谱基色光的第二亮度值,以及比较第一亮度值与第二亮度值,根据第一亮度值与第二亮度值中较大者计算所述窄光谱基色光光源的亮度控制值。
- 如权利要求2所述的***,其特征在于,所述动态色域补偿模块包括:光源新基色生成模块,用于根据控制所述激发光光源的亮度控制值以及控制所述窄光谱基色光光源的亮度控制值、计算新的色域并生成所述光源***的新的色坐标;像素新基色生成模块,用于利用所述光源***的新的色坐标求得该帧图像像素点色坐标的补偿矩阵,并利用所述补偿矩阵求得该帧图像的每一像素 点新色域下的控制信号,及输出所述每一像素点新色域下的控制信号至所述空间光调制装置,以控制所述空间光调制装置将所述光源***输出的基色光调制成携带图像信息的图像光。
- 如权利要求1所述的***,其特征在于,计算所需的窄光谱基色光的亮度值中,所述亮度值为所需的最小亮度值或最大亮度值。
- 如权利要求1-6所述的***,其特征在于,所述激发光光源为蓝激光、所述蓝激光经由处置后输出红荧光、绿荧光及蓝激光,所述窄光谱基色光包括红激光及/或绿激光。
- 一种动态调节显示***色域的方法,所述显示***包括光源***与成像***,所述光源***包括激发光光源与窄光谱基色光光源,所述激发光光源发出激发光,所述激发光经由处置后输出的基色光中包含至少一种宽光谱基色光,所述窄光谱基色光光源输出至少一种窄光谱基色光,所述窄光谱基色光与对应的宽光谱基色光合光后输出至所述成像***,所述成像***包括空间光调制装置,其特征在于,所述方法包括:计算一帧图像中具有最大亮度值Y max的像素点的色坐标(x,y)及亮度;根据所述光源***输出的基色光的色坐标与亮度以及最亮像素点的色坐标与亮度,计算所需宽光谱基色光的最小亮度值,根据所需宽光谱基色光的最小亮度值计算控制所述激发光光源的亮度控制值;根据所需宽光谱基色光的最小亮度值,计算所需窄光谱基色光的亮度值,根据所需窄光谱基色光的亮度值计算控制所述窄光谱基色光光源的亮度控制值;及根据控制激发光光源的亮度控制值以及控制窄光谱基色光光源的亮度控制值对应生成所述激发光光源与窄光谱基色光光源的光源亮度信号,并输出 所述光源亮度信号至所述激发光光源与窄光谱基色光光源,以调节所述激发光光源与窄光谱基色光光源发出光的亮度。
- 如权利要求9所述的方法,其特征在于,所述计算所需窄光谱基色光的亮度值的步骤包括:根据所需宽光谱基色光的最小亮度值以及最亮像素点的色坐标和亮度值,计算满足最亮像素点的亮度时,所需窄光谱基色光的亮度值,根据所需窄光谱基色光的亮度值计算控制所述窄光谱基色光光源的亮度控制值。
- 如权利要求9所述的方法,其特征在于,所述计算所需窄光谱基色光的亮度值的步骤包括:根据该帧图像的色域范围,计算所有像素点的色坐标中最大的色坐标值,再利用最大的色坐标值计算所需窄光谱基色光的亮度值,根据所需窄光谱基色光的亮度值计算控制所述窄光谱基色光光源的亮度控制值。
- 如权利要求9所述的方法,其特征在于,所述计算所需窄光谱基色光的亮度值的步骤包括:根据所需宽光谱基色光的最小亮度值以及最亮像素点的色坐标和亮度值,计算满足最亮像素点的亮度时,所需窄光谱基色光的第一亮度值;根据该帧图像的色域范围,计算所有像素点的色坐标中最大的色坐标值,再利用最大的色坐标值计算所需窄光谱基色光的第二亮度值;及比较第一亮度值与第二亮度值,根据第一亮度值与第二亮度值中较大者计算控制所述窄光谱基色光光源的亮度控制值。
- 如权利要求9所述的方法,其特征在于,还包括步骤:根据控制所述激发光光源的亮度控制值以及控制所述窄光谱基色光的亮度控制值计算新的色域并生成所述光源***新的色坐标、利用所述光源***新的色坐标对该帧图像每一像素点进行色域变换以生成每一像素点在新色域的控制信号至所述 空间光调制装置,以控制所述空间光调制装置将所述光源三基色光调制成携带图像信息的图像光。
- 如权利要求13所述的方法,其特征在于,所述生成每一像素点在新色域的控制信号的步骤包括:根据控制所述激发光光源的亮度控制值以及控制所述窄光谱基色光的亮度控制值、计算新的色域并生成所述光源***的新的色坐标;及利用所述光源***的新的色坐标求得该帧图像像素点色坐标的补偿矩阵,并利用所述补偿矩阵求得该帧图像的每一像素点在新色域下的控制信号,及输出所述每一像素新色域下的控制信号至所述空间光调制装置,以控制所述空间光调制装置将所述光源***输出的基色光调制成携带图像信息的图像光。
- 如权利要求9所述的方法,其特征在于,计算所需的窄光谱基色光的亮度值中,所述亮度值为所需的最小亮度值或最大亮度值。
- 如权利要求9-15所述的方法,其特征在于,所述激发光光源为蓝激光、所述蓝激光经由处置后输出红荧光、绿荧光及蓝激光,所述窄光谱基色光包括红激光及/或绿激光。
- 一种显示***,所述显示***包括光源***与成像***,所述光源***包括激发光光源与窄光谱基色光光源,所述激发光光源发出激发光,所述激发光经由处置后输出的基色光中包含至少一种宽光谱基色光,所述窄光谱基色光光源输出至少一种窄光谱基色光,所述窄光谱基色光与对应的宽光谱基色光合光后输出至所述成像***,其特征在于,所述成像***包括如权利要求1-8任一项所述的动态调节显示***色域的***及空间光调制装置。
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EP3845966A1 (en) | 2021-07-07 |
CN110874002B (zh) | 2021-12-21 |
CN110874002A (zh) | 2020-03-10 |
US11624976B2 (en) | 2023-04-11 |
US20210341825A1 (en) | 2021-11-04 |
EP3845966A4 (en) | 2021-10-13 |
EP3845966B1 (en) | 2024-04-10 |
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