阅读说明：本技术 动态调节显示系统色域的系统、方法及显示系统 (System and method for dynamically adjusting color gamut of display system and display system ) 是由 余新 胡飞 张贤鹏 郭祖强 李屹 于 2018-08-31 设计创作，主要内容包括：本发明涉及一种动态调节显示系统色域的系统、方法及显示系统,显示系统包括光源系统与成像系统,光源系统包括激发光光源与窄光谱基色光光源,激发光光源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系统,所述方法包括：计算一帧图像最亮像素点的色坐标与亮度；根据光源系统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；计算窄光谱基色光的亮度值；根据上述亮度值生成并输出激发光光源与窄光谱基色光光源的光源亮度信号,以调节激发光光源与窄光谱基色光光源发出光的亮度。本发明增强色域的同时提高了效率、降低了成本。(The invention relates to a system, a method and a display system for dynamically adjusting the color gamut of the display system, wherein the display system comprises a light source system and an imaging system, the light source system comprises an excitation light source and a narrow-spectrum primary color light source, the excitation light source emits excitation light, the excitation light is processed and then outputs at least one wide-spectrum primary color light, the narrow-spectrum primary color light source outputs at least one narrow-spectrum primary color light, and the narrow-spectrum primary color light and the wide-spectrum primary color light are combined and then output to the imaging system, the method comprises the following steps: calculating the color coordinate and the brightness of the brightest pixel point of one frame of image; calculating the minimum brightness value of the broad-spectrum primary light according to the color coordinates and the brightness of the primary light and the brightest pixel point of the light source system; calculating the brightness value of the narrow-spectrum primary light; and generating and outputting light source brightness signals of the excitation light source and the narrow-spectrum primary color light source according to the brightness values so as to adjust the brightness of the light emitted by the excitation light source and the narrow-spectrum primary color light source. The invention enhances the color gamut, improves the efficiency and reduces the cost.)

1. The utility model provides a system for dynamic adjustment display system colour gamut, its characterized in that, display system includes light source system and imaging system, light source system includes exciting light source and narrow spectrum primary color light source, exciting light source sends the exciting light, the exciting light includes at least one kind of wide spectrum primary color light in the primary color light of output after handling, narrow spectrum primary color light source output at least one kind of narrow spectrum primary color light, narrow spectrum primary color light with correspond wide spectrum primary color light output extremely after the light combination imaging system, imaging system include spatial light modulation device and the system of dynamic adjustment display system colour gamut, the system of dynamic adjustment display system colour gamut includes:

a light source brightness adjusting module, the light source brightness adjusting module further comprising:

the brightest pixel point acquisition module is used for calculating the color coordinate and the brightness of the brightest pixel point of one frame of image;

the wide-spectrum primary light brightness generation module is used for calculating the minimum brightness value of the required wide-spectrum primary light according to the color coordinate and the brightness of the primary light output by the light source system and the color coordinate and the brightness of the brightest pixel point, and calculating and controlling the brightness control value of the excitation light source according to the minimum brightness value;

the narrow-spectrum primary light brightness generation module is used for calculating the brightness value of the required narrow-spectrum primary light according to the minimum brightness value of the required wide-spectrum primary light and calculating and controlling the brightness control value of the narrow-spectrum primary light source according to the brightness value of the required narrow-spectrum primary light; and

and the brightness signal output module is used for correspondingly generating light source brightness signals of the excitation light source and the narrow-spectrum primary light source according to the brightness control value of the wide-spectrum primary light and the brightness control value of the narrow-spectrum primary light, and outputting the light source brightness signals to the excitation light source and the narrow-spectrum primary light source so as to adjust the brightness of the light emitted by the excitation light source and the narrow-spectrum primary light source.

2. The system of claim 1, further comprising a dynamic color gamut compensation module, configured to calculate a new color gamut according to a luminance control value for controlling the excitation light source and a luminance control value for controlling the narrow-spectrum primary light source, generate new color coordinates of the light source system, perform color gamut transformation on each pixel point of the frame image by using the new color coordinates of the light source system, and generate a control signal under the new color gamut of each pixel point to the spatial light modulation device, so as to control the spatial light modulation device to modulate the light source tricolor light into image light carrying image information.

3. The system of claim 2, wherein the narrow-spectrum primary light brightness generation module is further configured to calculate a brightness value of the desired narrow-spectrum primary light when the brightness of the brightest pixel point is met based on the minimum brightness value of the desired wide-spectrum primary light and the color coordinates and brightness values of the brightest pixel point, and to calculate the brightness control value of the narrow-spectrum primary light source based on the brightness value of the desired narrow-spectrum primary light.

4. The system of claim 2, wherein the narrow-spectrum primary light brightness generation module is further configured to calculate a maximum color coordinate value among the color coordinates of all the pixels according to the color gamut range of the frame of image, calculate a brightness value of the required narrow-spectrum primary light using the maximum color coordinate value, and calculate a brightness control value of the narrow-spectrum primary light source according to the brightness value of the required narrow-spectrum primary light.

5. The system of claim 2, wherein the narrow-spectrum primary light luminance generating module is further configured to calculate a first luminance value of the required narrow-spectrum primary light when the luminance of the brightest pixel point is satisfied according to the minimum luminance value of the required wide-spectrum primary light and the color coordinate and luminance value of the brightest pixel point, calculate a maximum color coordinate value among the color coordinates of all the pixel points according to the color gamut range of the frame image, calculate a second luminance value of the required narrow-spectrum primary light by using the maximum color coordinate value, compare the first luminance value with the second luminance value, and calculate the luminance control value of the light source of the narrow-spectrum primary light according to a larger one of the first luminance value and the second luminance value.

6. The system of claim 2, wherein the dynamic gamut compensation module comprises:

the light source new primary color generation module is used for calculating a new color gamut and generating new color coordinates of the light source system according to a brightness control value for controlling the exciting light source and a brightness control value for controlling the narrow-spectrum primary light source;

and the pixel new primary color generation module is used for obtaining a compensation matrix of the pixel point color coordinates of the frame of image by using the new color coordinates of the light source system, obtaining a control signal under the new color gamut of each pixel point of the frame of image by using the compensation matrix, and outputting the control signal under the new color gamut of each pixel point to the spatial light modulation device so as to control the spatial light modulation device to modulate the primary color light output by the light source system into image light carrying image information.

7. The system of claim 1, wherein the luminance value of the desired narrow-spectrum primary light is calculated as a desired minimum luminance value or a maximum luminance value.

8. The system of claims 1-6, wherein the excitation light source is a blue laser that outputs red, green, and blue laser light after treatment, and the narrow-spectrum primary light comprises red and/or green laser light.

9. A method of dynamically adjusting a color gamut of a display system, the display system including a light source system and an imaging system, the light source system including an excitation light source and a narrow-spectrum primary light source, the excitation light source emitting excitation light, the excitation light including at least one wide-spectrum primary light in a primary light output after treatment, the narrow-spectrum primary light source outputting at least one narrow-spectrum primary light, the narrow-spectrum primary light being output to the imaging system after being combined with a corresponding wide-spectrum primary light, the imaging system including a spatial light modulation device, the method comprising:

calculating the maximum brightness value Y in one frame image_maxThe color coordinates (x, y) and brightness of the pixel point(s);

calculating the minimum brightness value of the needed broad-spectrum primary light according to the color coordinate and the brightness of the primary light output by the light source system and the color coordinate and the brightness of the brightest pixel point, and calculating and controlling the brightness control value of the excitation light source according to the minimum brightness value of the needed broad-spectrum primary light;

calculating the brightness value of the required narrow-spectrum primary light according to the minimum brightness value of the required wide-spectrum primary light, and calculating and controlling the brightness control value of the narrow-spectrum primary light source according to the brightness value of the required narrow-spectrum primary light; and

and correspondingly generating light source brightness signals of the excitation light source and the narrow-spectrum primary color light source according to a brightness control value for controlling the excitation light source and a brightness control value for controlling the narrow-spectrum primary color light source, and outputting the light source brightness signals to the excitation light source and the narrow-spectrum primary color light source so as to adjust the brightness of light emitted by the excitation light source and the narrow-spectrum primary color light source.

10. The method of claim 9, wherein the step of calculating the luminance value of the desired narrow-spectrum primary light comprises: and calculating the brightness value of the required narrow-spectrum primary light source when the brightness of the brightest pixel point is met according to the minimum brightness value of the required wide-spectrum primary light and the color coordinate and the brightness value of the brightest pixel point, and calculating and controlling the brightness control value of the narrow-spectrum primary light source according to the brightness value of the required narrow-spectrum primary light.

11. The method of claim 9, wherein the step of calculating the luminance value of the desired narrow-spectrum primary light comprises: and calculating the maximum color coordinate value in the color coordinates of all the pixel points according to the color gamut range of the frame of image, calculating the brightness value of the required narrow-spectrum primary light by using the maximum color coordinate value, and calculating and controlling the brightness control value of the narrow-spectrum primary light source according to the brightness value of the required narrow-spectrum primary light.

12. The method of claim 9, wherein the step of calculating the luminance value of the desired narrow-spectrum primary light comprises:

calculating a first brightness value of the required narrow-spectrum primary light when the brightness of the brightest pixel point is met according to the minimum brightness value of the required wide-spectrum primary light and the color coordinate and the brightness value of the brightest pixel point;

calculating the maximum color coordinate value in the color coordinates of all the pixel points according to the color gamut range of the frame of image, and calculating the second brightness value of the required narrow-spectrum primary light by using the maximum color coordinate value; and

and comparing the first brightness value with the second brightness value, and calculating a brightness control value for controlling the narrow-spectrum primary light source according to the larger one of the first brightness value and the second brightness value.

13. The method of claim 9, further comprising the step of: and calculating a new color gamut according to the brightness control value for controlling the exciting light source and the brightness control value for controlling the narrow-spectrum primary light, generating new color coordinates of the light source system, performing color gamut transformation on each pixel point of the frame image by using the new color coordinates of the light source system to generate a control signal of each pixel point in the new color gamut, and sending the control signal to the spatial light modulation device so as to control the spatial light modulation device to modulate the light source tertiary primary light into image light carrying image information.

14. The method of claim 13, wherein the step of generating the control signal for each pixel in the new color gamut comprises:

calculating a new color gamut and generating new color coordinates of the light source system according to the brightness control value for controlling the exciting light source and the brightness control value for controlling the narrow-spectrum primary light; and

and obtaining a compensation matrix of the color coordinates of the pixel points of the frame of image by using the new color coordinates of the light source system, obtaining a control signal of each pixel point of the frame of image under the new color gamut by using the compensation matrix, and outputting the control signal of each pixel under the new color gamut to the spatial light modulation device so as to control the spatial light modulation device to modulate the primary color light output by the light source system into image light carrying image information.

15. The method of claim 9, wherein the luminance value of the desired narrow-spectrum primary light is calculated as a desired minimum luminance value or a maximum luminance value.

16. The method of claims 9-15, wherein the excitation light source is a blue laser that outputs red, green, and blue laser light after treatment, and the narrow-spectrum primary light comprises red and/or green laser light.

17. A display system, comprising a light source system and an imaging system, wherein the light source system comprises an excitation light source and a narrow-spectrum primary light source, the excitation light source emits excitation light, the excitation light includes at least one wide-spectrum primary light in the primary light outputted after treatment, the narrow-spectrum primary light source outputs at least one narrow-spectrum primary light, and the narrow-spectrum primary light and the corresponding wide-spectrum primary light are combined and outputted to the imaging system, wherein the imaging system comprises the system for dynamically adjusting the color gamut of the display system according to any one of claims 1 to 8 and a spatial light modulation device.

Technical Field

The present invention relates to display systems, and more particularly, to a projection system, a method and a display system for dynamically adjusting a color gamut of a display system.

Background

In a basic laser fluorescent light source, short-wavelength visible light emitted by laser excites phosphor on a wavelength conversion device to generate time-sequential fluorescent primary color light or white light, but the spectral range of the fluorescence is wide, so that the color gamut coverage of the light source is narrow. In another improved laser fluorescence light source, the short wavelength visible light emitted by the laser is converted into primary light by the wavelength conversion device and filtered by the synchronous filter device to obtain the primary light with narrow band and higher color purity so as to expand the color gamut of the laser fluorescence.

In a further improvement of the laser fluorescent light source system, red and green laser lights of pure colors are mixed in the laser fluorescent light to expand the color gamut of the light source, please refer to U.S. patent application publication No. 20150316775a1 and chinese patent application No. 201110191454.8. Although the color gamut of laser fluorescence can be expanded by doping pure-color laser, when the light source is not applied to a display system, the proportion of the light source is modulated according to the display content, so that the range of the color gamut which can be enhanced is limited, and in addition, if the color gamut of the laser fluorescence is expanded to the DCI-P3 standard, the pure-color laser with the fluorescence brightness of 40 percent needs to be added, so that high-power red-green laser needs to be added, and the system cost is greatly increased.

In order to expand the color gamut, another method is to increase the color saturation of red and green fluorescence through a filter device on the basis of adding sufficient red and green laser, so that the fluorescence and the laser can be synthesized into primary light meeting rec2020 standard color gamut, but this method has high cost and greatly reduces the efficiency (the typical proportion of red and green fluorescence is about 30%, thereby reducing the efficiency of the system of about 30% upward).

Disclosure of Invention

In view of the above situation, the present invention provides a projection system, a method and a display system for dynamically adjusting a color gamut of a display system, so as to solve the problems of cost increase and efficiency reduction caused by expanding the color gamut.

In one aspect, the present invention provides a system for dynamically adjusting color gamut of a display system, the display system comprising a light source system and an imaging system, the light source system comprises an excitation light source and a narrow-spectrum primary light source, the excitation light source emits excitation light, the exciting light comprises at least one wide-spectrum primary light in the primary light output after treatment, the narrow-spectrum primary light source outputs at least one narrow-spectrum primary light, the narrow-spectrum primary light and the corresponding wide-spectrum primary light are combined and output to the imaging system, the imaging system comprises processing means, storage means, and spatial light modulation means, the system for dynamically adjusting the color gamut of a display system being stored in the storage means and being executed by the processing means, the system for dynamically adjusting the color gamut of the display system comprises a light source brightness adjusting module, wherein the light source brightness adjusting module comprises: the brightest pixel point acquisition module is used for calculating the color coordinate and the brightness of the brightest pixel point of one frame of image; the wide-spectrum primary light brightness generation module is used for calculating the minimum brightness value of the required wide-spectrum primary light according to the color coordinate and the brightness of the primary light output by the light source system and the color coordinate and the brightness of the brightest pixel point, and calculating and controlling the brightness control value of the excitation light source according to the minimum brightness value of the required wide-spectrum primary light; the narrow-spectrum primary light brightness generation module is used for calculating the minimum brightness value of the required narrow-spectrum primary light according to the minimum brightness value of the required wide-spectrum primary light and calculating and controlling the brightness control value of the narrow-spectrum primary light source according to the brightness value of the required narrow-spectrum primary light; and the brightness signal output module is used for correspondingly generating 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 wide-spectrum primary color light and the brightness control value of the narrow-spectrum primary color light, and outputting the light source brightness signals to the excitation light source and the narrow-spectrum primary color light source so as to adjust the brightness of the light emitted by the excitation light source and the narrow-spectrum primary color light source.

In another aspect, the present invention further provides a method for dynamically adjusting a color gamut of a display system, where 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 light source, the excitation light source emits excitation light, the primary light output after treatment includes at least one wide-spectrum primary light, the narrow-spectrum primary light source outputs at least one narrow-spectrum primary light, the narrow-spectrum primary light is combined with a corresponding wide-spectrum primary light and then output to the imaging system, the imaging system includes a spatial light modulation device, and the method includes: calculating the color coordinate and the brightness of the brightest pixel point of one frame of image; calculating the minimum brightness value of the needed broad-spectrum primary light according to the color coordinate and the brightness of the primary light output by the light source system and the color coordinate and the brightness of the brightest pixel point, and calculating and controlling the brightness control value of the excitation light source according to the minimum brightness value of the needed broad-spectrum primary light; calculating the brightness value of the required narrow-spectrum primary light according to the minimum brightness value of the required wide-spectrum primary light, and calculating and controlling the brightness control value of the narrow-spectrum primary light source according to the brightness value of the required narrow-spectrum primary light; and correspondingly generating light source brightness signals of the excitation light source and the narrow-spectrum primary color light source according to the brightness control value for controlling the excitation light source and the brightness control value for controlling the narrow-spectrum primary color light source, and outputting the light source brightness signals to the excitation light source and the narrow-spectrum primary color light source so as to adjust the brightness of the light emitted by the excitation light source and the narrow-spectrum primary color light source.

In a third aspect, the present invention further provides a display system, where 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 light, the primary color light output by the excitation light after treatment includes at least one wide-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 wide-spectrum primary color light are combined and output to the imaging system, and the imaging system includes the system for dynamically adjusting the color gamut of the display system and the spatial light modulation device.

According to the system, the method and the display system for dynamically adjusting the display system, provided by the embodiment of the invention, on one hand, the excitation light with better monochromaticity and the wide-spectrum fluorescence are utilized to synthesize new primary color light, so that the color gamut of the display system is enlarged; on the other hand, the minimum brightness of the required broad-spectrum primary light is calculated according to the brightness of the brightest pixel point of the image picture, and the brightness value of the broad-spectrum primary light is minimized under the condition that the picture brightness is kept, so that the color gamut of the display system can be expanded to the maximum value; meanwhile, the new color coordinates of the light source system are calculated according to the modulated primary color illumination light brightness, the compensation matrix of the original signal of the frame image is calculated according to the new color coordinates of the light source system, the original signal of the frame image is compensated by the compensation matrix to generate an image signal after each pixel of the image is compensated, the image signal is used for controlling the output of the spatial light modulation device, and therefore the color difference of each frame of image caused by the color gamut change is correspondingly compensated according to the difference of each frame of image. Therefore, the system, the method and the display system for dynamically adjusting the color gamut of the display system provided in the embodiments of the present invention can significantly enhance the color gamut of the display system (e.g., enhance the color gamut of the display system to the REC2020 color gamut standard) while maintaining the higher efficiency of the display system and reducing the color difference.

Drawings

Fig. 1 is a schematic structural diagram of a display system for dynamically adjusting a color gamut of the display system according to an embodiment of the present invention.

FIG. 2 is a block diagram of a system for dynamically adjusting 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 the 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 the 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 the color gamut of a display system according to a third embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below for clarity and completeness, and the same or similar elements are numbered in different embodiments below for conciseness and clarity. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, which is a schematic view illustrating 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 light source 120, and a wavelength conversion and light combination device 130. The short wavelength excitation light emitted from the excitation light source 110 is guided to the wavelength conversion and light combination device 130, absorbed by the wavelength conversion and light combination device 130 and generates a broad spectrum primary light, the narrow spectrum primary light emitted from the narrow spectrum primary light source 120 is guided to the wavelength conversion and light combination device 130, and is combined with the broad spectrum primary light at the wavelength conversion and light combination device 130. In this embodiment, the excitation light source 110 is a blue laser source, the emitted excitation light is a blue laser, and the wavelength conversion and light combination device 130 is provided with a wavelength conversion material and a scattering material in different regions, wherein the wavelength conversion material includes a red phosphor material and a green phosphor material. The red, green and blue light regions cut into the emitting path of the excitation light in turn, so that three primary colors of red, green and blue laser are emitted at the wavelength conversion and light combination device 130. In this embodiment, the narrow-spectrum primary light source 120 includes a red laser light source and a green laser light source, which emit two primary lights of red laser and green laser according to a time sequence, wherein the red laser is guided to the wavelength conversion and light combination device 130 to combine with the red fluorescence, and the green laser is guided to the wavelength conversion and light combination device 130 to combine with the green fluorescence. The light source system 10 ultimately outputs the three primary colors of red, green, and blue illumination light to the imaging system 20.

For convenience of description, in the embodiment of the present invention, the red light R, the green light G, and the blue light G output by the light source system 10 are referred to as light source tricolor light, and correspond to image data displayed by the tricolor light, and each pixel point of the image data can be represented by the tricolor light, i.e., P (R, G, b). The red fluorescence r, the green fluorescence g, the blue laser b, the red laser r ', and the green laser b' output by the light source system 10 are referred to as light source five primary colors, and correspond to image data displayed by the five primary colors, and each pixel of the image data can also be represented by the five primary colors, i.e., P (r, g, b, r ', b'). Descriptions such as the three primary color coordinates and luminance of the light source system 10, the five primary color coordinates and luminance of the light source system 10, the pixel three primary color coordinates and luminance, the pixel five primary color coordinates and luminance and the like will also appear below, the three-primary-color coordinates and brightness of the light source system 10 refer to the color coordinates and brightness of red-light R, green-light G, and blue-light G three-primary-color light output by the light source system 10 in a certain color space, the pixel three-primary-color coordinates and brightness refer to the three-primary-color coordinates and brightness of each pixel in a frame of image in a certain color space, the five-primary-color coordinates and brightness of the light source system 10 refer to the color coordinates and brightness of red-fluorescence R, green-fluorescence G, blue-laser b, red-laser R ', and green-laser b' five-primary-color light output by the light source system 10 in a certain color space, and the pixel five-primary-color coordinates and brightness refer to the five-primary-color coordinates and brightness of each pixel in a frame of image in a certain color space.

In the above embodiments, the manner of guiding the excitation light and the narrow-spectrum primary light to the wavelength conversion and light combination device 130, and the manner of guiding the primary light from the wavelength conversion and light combination device 130 to the imaging system 20 can refer to the prior art, and will not be described here.

It is understood that in other embodiments, the wavelength conversion and light combination device 130 can be separated into two devices, which can be disposed adjacent to or spaced apart from each other, and is not limited herein.

It is understood that the light source system 10 may further include a light filtering device, which may be integrated with or separate from the wavelength conversion and light combination device 130, and is not limited thereto.

It is understood that in other embodiments, the light source system 10 can generate the blue and yellow fluorescence first, and then filter the red and green fluorescence from the yellow fluorescence.

In any case, it is understood that the light source system 10 includes an excitation light source 110 and a narrow-spectrum primary light source 120, the excitation light emitted by the excitation light source 110 being treated, e.g., wavelength converted, filtered, or scattered, and so on, to output blue light and a broad spectrum of red and green light, the narrow-spectrum primary light source 120 outputting at least one narrow-spectrum primary light that is a narrow spectrum of red and/or green light that combines with a corresponding broad spectrum of primary light to cause the light source system to output red, green, and blue light to the imaging system, the red, green, and blue light comprising light source tri-primary light.

The imaging system 20 comprises a processing means 210, a storage means 220 and a spatial light modulation means 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, and the spatial light modulator 230 modulates the primary light output from the light source system 10 into image light carrying image information under the control of the processing device 210, and the image light is output and projected onto a screen (not shown) through a projection lens 240 to form an image.

In the present embodiment, a system 221 for dynamically adjusting the color gamut of the display system (hereinafter referred to as "dynamic adjustment system 221") is installed and operated in the imaging system 20, and specifically, the dynamic adjustment system 221 may be divided into one or more modules, which are stored in the storage device 220 and executed by the processing device 210, so as to dynamically adjust the color gamut of the display system 1 according to the display content of the display system 1. Further, the processing device 210 obtains an original signal of an image from the image source 30 in real time, for a specific frame of image, the processing device 210 operates the dynamic adjustment system 221, calculates a minimum brightness value of the broad-spectrum primary light and a minimum brightness value of the narrow-spectrum primary light required for displaying the frame of image according to the obtained original signals, and generates light source brightness signals for controlling the excitation light source 110 and the narrow-spectrum primary light source 120 accordingly, the light source brightness signals are output to a gamma corrector 40, and are output to the excitation light source 110 and the narrow-spectrum primary light source 120 after being corrected by the gamma corrector 40, so as to adjust the brightness of the illumination light emitted by the excitation light source 110 and the narrow-spectrum primary light source 120, thereby generating five primary lights with different proportions and outputting the five primary lights to the spatial light modulation device 230. On the basis, the processing device 210 further calculates a new color gamut according to the light source luminance signal and generates new color coordinates of the light source system 10, such as new three primary color (R, G, B) color coordinates, performs color gamut transformation on the original signal of each pixel of the frame image by using the new color coordinates of the light source system 10 to generate new color coordinates of each pixel, and outputs the new color coordinates to the spatial light modulation device 230 to control the spatial light modulator 230 to modulate the primary color light output by the light source system 10 into image light carrying image information.

Referring to fig. 2, the dynamic adjustment system 221 can be divided into a light source brightness adjustment module 2210 and a dynamic color gamut compensation module 2220. The light source brightness adjusting module 2210 is configured to calculate a minimum brightness value of the wide-spectrum primary light and a brightness value of the narrow-spectrum primary light required for displaying a frame of image according to the obtained original signal of the frame of image, generate light source brightness signals for controlling the excitation light source 110 and the narrow-spectrum primary light source 120, and output the light source brightness signals to control the excitation light source 110 and the narrow-spectrum primary light source 120, the dynamic color gamut compensating module 2220 is configured to calculate a new color gamut and generate new color coordinates of the light source system 10 according to the brightness control value of the wide-spectrum primary light and the brightness control value of the narrow-spectrum primary light, perform color gamut transformation on each pixel point of the frame of image by using the new color coordinates of the light source system 10 to generate a control signal under the new color gamut of each pixel point, and output the control signal under the new color gamut of each pixel point to the spatial light, to control the spatial light modulation device 230 to modulate the primary light output from the light source system 10 into image light carrying image information. The light source brightness adjustment module 2210 can be further divided into a brightest pixel point obtaining module 2211, a wide-spectrum primary light brightness generation module 2212, a narrow-spectrum primary light brightness generation module 2213 and a brightness signal output module 2214. The dynamic 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. It should be noted that the modules referred to in the present invention are program segments capable of performing a specific function, and are more suitable than programs for describing the execution process of software in the display system 1, and the detailed functions of the modules will be described in detail with reference to the flowchart of fig. 3.

Fig. 3 is a flowchart illustrating a method for dynamically adjusting a color gamut of a display system according to an embodiment of the invention. The method can be implemented by using the display system 1 shown in fig. 1, and the method for dynamically adjusting the color gamut of the display system is described in detail below with reference to the display system 1.

First, in step S1, the brightest pixel point obtaining module 2211 calculates the color coordinates (x, Y) and the brightness Y of the pixel point a (hereinafter referred to as "brightest pixel point a") with the maximum brightness of one frame of image_max. Specifically, the color coordinate and the brightness of the brightest pixel point a in one frame of image can be calculated by using an algorithm for solving the maximum value.

In step S2, the broad-spectrum primary light luminance generation module 2212 calculates the minimum luminance value of the required broad-spectrum primary light according to the color coordinate and luminance of the primary light output from the light source system 10 and the color coordinate and luminance of the brightest pixel point a, and calculates the luminance control value for controlling the excitation light source 110 according to the minimum luminance value of the required broad-spectrum primary light.

Specifically, in an embodiment, the excitation light source 110 is a blue laser, the blue laser obtains a wide spectrum red-green fluorescence and a narrow spectrum blue laser after treatment, and the wide spectrum primary light brightness generation module 2212 calculates a minimum brightness value of the required red-green fluorescence and generates a brightness control value of the excitation light source 110 according to the minimum brightness value of the required red-green fluorescence, so as to control the intensity of the blue laser emitted by the excitation light source 110 and thus control the intensities of the red-green fluorescence and the blue laser output by the light source system 10.

In step S3, the narrow-spectrum primary light luminance generation module 2213 calculates the luminance value of the desired narrow-spectrum primary light, that is, the first luminance value, when the luminance of the brightest pixel point a is satisfied, according to the minimum luminance value of the desired wide-spectrum primary light and the color coordinate and luminance value of the brightest pixel point a.

Specifically, in one embodiment, the narrow-spectrum primary light source 120 includes a red-green laser light source, so the narrow-spectrum primary light brightness generation module 2213 calculates the brightness value of the required red-green laser. Further, as an embodiment, the brightness value may be a minimum brightness value required, a maximum brightness value required, or a value between the minimum brightness value and the maximum brightness value.

In step S4, the narrow-spectrum primary color light brightness generation module 2213 calculates the maximum color coordinate value in the color coordinates of all the pixels according to the color gamut range of the frame image, i.e., the color coordinate of each pixel, and then calculates the brightness value of the required narrow-spectrum primary color light, i.e., the second brightness value, using the maximum color coordinate value. Specifically, in an embodiment, the narrow-spectrum primary color light brightness generation module 2213 calculates a maximum value of an x value corresponding to the red light of the primary color light and a maximum value of a y value corresponding to the green light of the primary color light in all the pixel points, and calculates a brightness value of red and green laser light required to be emitted by the narrow-spectrum primary color light source 120, that is, a second brightness value, by using the maximum x value and the maximum y value. Also, as an embodiment, the brightness value may be a minimum brightness value required, a maximum brightness value required, or a value between the minimum brightness value and the maximum brightness value.

In step S5, the narrow-spectrum primary-color light brightness generation module 2213 compares the first brightness value with the second brightness value, and calculates the brightness control value for controlling the narrow-spectrum primary-color light source 120 according to the greater of the first brightness value and the second brightness value.

In step S6, the brightness signal output module 2214 generates light source brightness signals of the excitation light source 110 and the narrow-spectrum primary light source 120 according to the brightness control value for controlling the excitation light source 110 and the brightness control value for controlling the narrow-spectrum primary light source 120, and outputs the light source brightness signals to the excitation light source 110 and the narrow-spectrum primary light source 120 to adjust the brightness of the illumination light emitted by the excitation light source 110 and the narrow-spectrum primary light source 120, so as to generate five primary lights with different proportions and output the five primary lights to the spatial light modulation device 230.

In step S7, the light source new primary color generation module 2221 calculates a new color gamut and generates new color coordinates and luminance of the light source system 10 according to the luminance control value for controlling the excitation light source 110 and the luminance control value for controlling the narrow-spectrum primary light source 120.

In step S8, the new primary color generation module 2222 uses the new color coordinates and brightness of the light source system 10 to obtain a compensation matrix of the original signal of the frame image, and uses the compensation matrix to obtain a control signal under the new color gamut of each pixel of the frame image.

In step S9, the new pixel primary color generation module 2222 outputs a control signal in the new color gamut of each pixel of the frame image to the spatial light modulation device 230, so as to control the spatial light modulation device 230 to modulate the primary color light output by the light source system 10 into the image light carrying the image information.

In another embodiment, the steps S3-S5 may be replaced by step S3a, and in step S3a, the narrow-spectrum primary light brightness generation module 2213 calculates the brightness value of the required narrow-spectrum primary light when the brightness of the brightest pixel point a is satisfied according to the minimum brightness value of the required wide-spectrum primary light and the color coordinate and brightness value of the brightest pixel point a, and calculates the brightness control value for controlling the narrow-spectrum primary light source 120 according to the brightness value. In one embodiment, the brightness value may be a desired minimum brightness value, a desired maximum brightness value, or a value between the minimum brightness value and the maximum brightness value.

In yet another embodiment, the steps S3-S5 may be replaced by step S3b, and in step S3b, the narrow-spectrum primary light brightness generation module 2213 calculates the maximum color coordinate value among the color coordinates of all the pixels according to the color gamut range of the frame image, calculates the brightness value of the required narrow-spectrum primary light by using the maximum color coordinate value, and calculates the brightness control value for controlling the narrow-spectrum primary light source 120 according to the brightness value. In one embodiment, the brightness value may be a desired minimum brightness value, a desired maximum brightness value, or a value between the minimum brightness value and the maximum brightness value.

The following describes in detail the algorithm for generating the light source luminance signal and the dynamic color gamut adjustment for each pixel of a frame image in this embodiment.

Since one frame of image adopts different color spaces according to different coding formats, the more commonly used color spaces include RGB coding and YUV coding. The display system needs to convert the colors of the image signal from the color space of the video signal to the color space of the display system. Take RGB encoded video signals as an example. The RGB signals define the ratio of the three primary colors of red, green and blue with the three numbers R, G and B. Typically 8-bit depth encoded RGB signals are used, each primary representing the modulation depth of the three primaries by an integer of 8 bits. 0 represents that the primary is completely off and 255 represents that the primary is displayed with the highest brightness. The RGB primaries are different depending on the color gamut selected for the video signal. For example, the RGB three primary colors specified by the REC2020 color gamut standard are (0.708,0.292,0.2627), (0.17,0.797,0.6780), (0.131,0.046,0.0593) respectively in the xyz coordinate. The xyz color gamut coordinate is defined in the CIE 1931 standard. The three primary colors of each pixel point of a frame image can be defined as:

then converting each pixel point (r, g, b) of the frame image into CIE 1931 color space as follows:

wherein:

wherein, the XYZ coordinate is a normalized representation of the XYZ coordinate, and the conversion relationship between the two is as follows:

in the light source system 10 with the red and green laser added, the light source system 10 outputs five primary colors, wherein coordinates and brightness of the five primary colors are defined as:

wherein r is₀,g₀,b₀,rl₀And gl₀Respectively represent red fluorescence, green fluorescence, blue laser, red laser and green laser in the light source five-primary-color light. r is₀、g₀And b₀Are all excited by the excitation light emitted from the excitation light source 110, and thus the brightness thereof is proportional to the output power of the excitation light source 110, the output power of the excitation light source 110 is reduced, r₀、g₀And b₀Will also decrease in brightness by the same proportion. Thus r₀、g₀And b₀The brightness control is performed by the same brightness control quantity d_pAnd (6) determining. In a monolithic projection system, the three primary colors red, green and blue are separated in time sequence, so that r₀、g₀And b₀Can also be controlled separately, but requires high speed driving of the light source. In the present embodiment, r is not involved for the time being₀、g₀And b₀Can be controlled individually. And for the red laser rl emitted by the narrow-spectrum primary light source 120₀And green laser gl₀The brightness of the light source can be controlled, and the corresponding brightness control amount is d_rAnd d_g。

Because the maximum brightness pixel point of one frame image determines the output power required by the light source system, the correct brightness value of all pixel points can be ensured. The pixel point with the maximum brightness of one frame of image can be obtained by an algorithm for obtaining the maximum value, which is not described herein again.

Define the brightest pixel point a as: [ x ] of_maxy_maxY_max]The coordinate value of the brightest pixel point a in cie 1931 color space is determined by mixing five primary lights of the light source:

wherein the angle labeled XYZ values in formula (2) are the corresponding change in the XYZ values according to formula (1). d_p、d_rAnd d_gIs the corresponding brightness control quantity. r is_max，g_maxAnd b_maxIs the brightest point in the region of d_p，d_rAnd d_gNew three primary color RGB color coordinate d under brightness control quantity_p，d_r，d_g，r_max，g_maxAnd b_maxAre all unknown. Thus, six unknowns are solved by the three equations in equation (2), with infinite sets of solutions. Therefore, the limiting conditions are considered:

r_max∈[0,1]

g_max∈[0,1]

b_max∈[0,1]

d_p∈[0,1]

d_r∈[0,1]

d_g∈[0,1]

the minimum ratio of the broad spectrum primary light, i.e. the ratio of the minimum red and green fluorescence in the present embodiment, i.e. the min (d) satisfying the above-mentioned limitation condition, is obtained while maintaining the brightness of the brightest pixel point A_p)。

After eliminating the element of the formula (2), d_pCan be expressed as:

wherein:

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) is equivalent to max (Br)_max+Cg_max+Db_max) And the denominator of equation (3) is a linear function, so when the denominator of equation (3) takes the maximum value

D can be calculated by the equation (3)_pSo that d can be calculated by the carry-in (2)_rAnd d_gAccording to d_pCan obtainObtaining the minimum brightness value of the red and green fluorescence, correspondingly calculating the brightness control value of the red and green fluorescence, and calculating the brightness control value according to d_rAnd d_gThe minimum brightness value (first brightness value) of the red and green laser can be obtained and the brightness control value d of the red and green laser can be calculated correspondingly_rAnd d_gThis minimum value can be taken to save energy. In other embodiments, d may be added as needed_r1 and d_gTo obtain the maximum color gamut as 1. The maximum color gamut envelope can be calculated according to the color gamut statistics of the frame image to obtain the minimum brightness value (second brightness value) of the red and green laser, and the maximum value is obtained by comparing the minimum brightness value with the first brightness value to obtain the final brightness control value of the red and green laser. After the brightness control values of the red-green fluorescence and the red-green laser are known, the new color gamut of the light source system 10 can be calculated as follows:

the dynamically calculated color gamut will be used for color compensation of the image picture so that the picture obtains the correct color in the new color gamut obtained by the new light source matching.

Specifically, a new color gamut may be calculated based on the luminance 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 colors corresponding to the respective color components that can be modulated by the spatial light modulation device 230. For example, if the spatial light modulator processes red, green, and blue lights respectively in three time sequences, the color gamut that the display system 1 can represent is determined by the color coordinates and brightness of the illumination light emitted from the light source system 10 in the three time sequences. If one or some of the color sequences is illumination light composed of a plurality of primary colors, the primary colors representing the color gamut within the color sequence are determined by the total color coordinates and the total amount of the composed primary colors. For example, in one frame of image, if the red fluorescence with a% relative to the peak luminance and the red laser with b% relative to the peak luminance are present in the red color sequence, the primary color light determined by the red color sequence is determined by the color coordinates and luminance of the illumination light obtained by mixing the red fluorescence with a% and the red laser with b%. Therefore, the new RGB color coordinates of the three primary colors mixed by the light source system 10 can be obtained according to the brightness value and the color coordinates of each primary color outputted by the light source system 10.

Then, the new color coordinates and brightness of the light source system 10 are used to obtain a compensation matrix of the original signal of the frame image, and the compensation matrix is used to obtain new color coordinates of each pixel point of the frame image, i.e. a control signal under the new color gamut of each pixel point. In the present embodiment, the compensation matrix is determined by the following method:

CIE 1937 defines the absolute color and the brightness of the color that any human eye can resolve in one three-dimensional vector. Which does not change with the change of the color gamut. The three primary colors of the display system 1 satisfy the following formula:

to display the color represented by the original signal of the image under the display system 1, the brightness of the three primary colors displayed by the display system 1 is required to satisfy:

whereinRepresenting the modulated signal intensities of the three primary colors in the display system 1, and C' is:

in this way, the relationship from the gamut space of the original signal of the input image to the three primary color modulation signals of the display system 1 can be defined as:

the principle of color conversion is described here only by way of example with a three primary color system. For projection systems using four or five primary colors, C' is 4x3 orThe determinant value of the pseudo-inverse matrix of the 5x3 matrix is zero, so that the conversion from the XYZ space to the primary color space has an infinite solution. C'^-1Is a conversion matrix from XYZ to 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, distributing the primary color brightness as evenly as possible, and the like. Calibration of the color of the display system 1, i.e. calibration of C'. The accurate measurement of the color coordinates and brightness values of the primary colors of the display system 1 to generate the accurate C' is the basis for ensuring the accurate color display of the display system 1.

Since the panel control chips provided by the suppliers of the existing mainstream display panels (i.e. spatial light modulators) all integrate color management modules such as color gamut conversion and gamma correction to perform color management functions, and these color management modules use registers to store color transformation matrices, and use the color transformation matrices to convert the color space of the input signal into the color space of the display system for the color signal input by each pixel, in this embodiment, the improvement of the existing mainstream display system can perform dynamic color gamut compensation on a frame of image before the frame of image reaches the panel control chip, wherein the color transformation matrices recorded in the panel control chip can be set as:

T＝C′^-1C

wherein C' is a transformation matrix from rgb space to XYZ space under three primary colors recorded by the panel control chip, and C is a transformation matrix for converting the original signal of the input video or image into XYZ space. After the fluorescence and laser of the light source system 10 are modulated according to the light source brightness signal, in order to make the rgb value converted by the panel control chip satisfy the new synthesis of dynamically generated color gamut and maintain the color unchanged, i.e. the XYZ coordinates of the color are unchanged, the signal input to the panel control chip needs to be converted on the basis of the original input signal, i.e. the original signal:

where C is the image original signal gamut variation pairThe corresponding conversion matrix, C' is the gamut conversion matrix recorded in the panel control chip, C "is the conversion matrix of the dynamic new gamut, i.e. the compensation matrix,the signal is the compensated signal input to the panel control chip. By using the above formula, it can be ensured that the color displayed by the display system 1 does not change under the condition of the color gamut change caused by the modulation of the light source system 10.

It is understood that although the above-mentioned embodiments only take the case where the light source system 10 emits the illumination light of five primary colors as an example, in other embodiments, the light source system 10 may be configured to emit only illumination light of four primary colors, 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'. Furthermore, the excitation light source 110 of the light source system 10 may output the excitation light after treatment, and the primary light may only include one broad-spectrum primary light, such as red fluorescence or green fluorescence, according to the requirements of a specific situation.

In summary, the system, the method and the display system for dynamically adjusting a display system according to the embodiments of the present invention, on one hand, synthesize new primary color light by using excitation light with better monochromaticity and broad spectrum fluorescence, so as to expand the color gamut of the display system; on the other hand, the minimum brightness of the required broad-spectrum primary light is calculated according to the brightness of the brightest pixel point of the image picture, and the brightness value of the broad-spectrum primary light is optimized under the condition that the picture brightness is kept, so that the color gamut of the picture can be expanded to the maximum value; meanwhile, the new color coordinates of the light source system are calculated according to the modulated primary color illumination light brightness, the compensation matrix of the original signal of the frame image is calculated according to the new color coordinates of the light source system, the original signal of the frame image is compensated by the compensation matrix to generate a control signal of each pixel point of the compensated image, the control signal is used for controlling the output of the spatial light modulation device, and therefore color difference of each frame image due to color gamut change is dynamically compensated according to different frames of images. Therefore, the system, the method and the display system for dynamically adjusting the color gamut of the display system provided in the embodiments of the present invention significantly enhance the color gamut of the display system (enhance the color gamut to meet the REC2020 color gamut standard) while maintaining the higher efficiency of the display system and reducing the color difference.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention.