CN109324465B - Display apparatus and display method - Google Patents

Display apparatus and display method Download PDF

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CN109324465B
CN109324465B CN201710643551.3A CN201710643551A CN109324465B CN 109324465 B CN109324465 B CN 109324465B CN 201710643551 A CN201710643551 A CN 201710643551A CN 109324465 B CN109324465 B CN 109324465B
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light
image
color
image data
color gamut
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CN109324465A (en
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郭祖强
杜鹏
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/206—Control of light source other than position or intensity

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
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  • Optics & Photonics (AREA)
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Abstract

The invention relates to a display device and a display method. The display device includes a light source device, an image data processing module, and a light modulation device. The image data processing module receives first image data, wherein the first image data comprises three primary color brightness data of each pixel of an image based on the second light; when the image belongs to the narrow color gamut image, the image data processing module transmits second image data to the light modulation device, wherein the second image data is obtained by converting three-primary-color brightness data based on second light of each pixel of the image; when the image belongs to the wide color gamut image, the image data processing module transmits the first image data to the light modulation device, and the light modulation device modulates the second light according to the first image data or modulates the first light according to the second image data to generate the image light.

Description

Display apparatus and display method
Technical Field
The invention relates to the technical field of display, in particular to display equipment and a display method.
Background
The color gamut generally refers to the spectrum locus of visible light that can be seen by human eyes in nature, and the area of the region formed by the visible spectrum locus is the maximum color gamut area that can be seen by human eyes. At present, display pens such as projectors and displays which are composed of different display devices use R, G, B three-primary-color display systems to reproduce and restore the colors of images. In a given chromaticity space, such as CIE1931x, y chromaticity space, the triangle formed by the R, G, B three primary colors of a display device is called the color gamut which can be displayed by the device, and the larger the area of the color gamut space, the more vivid and vivid the color picture is, but this requires the light source of the display device to provide the larger color gamut. For example, the wide color gamut light source (e.g., R, G, B three-color pure laser light source) can achieve the color gamut standard of rec.2020, but the wide color gamut light source is generally expensive, e.g., red laser and green laser are expensive and the electro-optical conversion efficiency is low.
Disclosure of Invention
In order to solve the technical problem that the light source cost of the existing wide color gamut display equipment is high, the invention provides the display equipment and the display method which can realize the wide color gamut and have low light source cost.
A display apparatus, comprising:
a light source device for emitting first light for modulating a narrow color gamut image and second light for modulating a wide color gamut image; all pixels of the narrow color gamut image are located within a first color gamut range, all pixels of the wide color gamut image are located within a second color gamut range, and at least a portion of the pixels are located outside the first color gamut range; wherein the second gamut range covers the first gamut range and has a portion that is outside of the first gamut range;
the image data processing module is used for receiving first image data, and the first image data comprises three-primary-color brightness data of each pixel of an image based on the second light; the image data processing module is also used for judging the color gamut range of the image; when the image belongs to the narrow color gamut image, the image data processing module transmits second image data obtained by converting three primary color brightness data of each pixel of the image based on the second light to a light modulation device and transmits a signal for emitting the first light to the light source device; when the image belongs to the wide color gamut image, the image data processing module transmits the first image data to a light modulation device and transmits a signal for emitting second light to the light source device;
the light modulation device is used for modulating second light or first light emitted by the light source according to the first image data or the second image data transmitted by the image data processing module.
A display method, comprising the steps of:
providing first light for modulating a narrow color gamut image and second light for modulating a wide color gamut image; all pixels of the narrow color gamut image are located within a first color gamut range, all pixels of the wide color gamut image are located within a second color gamut range, and at least a portion of the pixels are located outside the first color gamut range; wherein the second gamut range covers the first gamut range and has a portion that is outside of the first gamut range;
receiving first image data, wherein the first image data comprises three primary color brightness data of each pixel of an image based on the second light;
judging the color gamut range of the image, and outputting second image data and a signal for emitting first light when the image belongs to the narrow color gamut image, wherein the second image data is obtained by converting the three-primary-color brightness data of each pixel of the image based on the second light; outputting the first image data and a signal to emit second light when the image belongs to the wide color gamut image; and
modulating the first light according to the second image data or modulating the second light according to the first image data.
In one embodiment, the second image data is obtained by calculating three primary color luminance data based on the second light, color coordinates of a vertex of the second color gamut range, and color coordinates of a vertex of the first color gamut range for each pixel of the image.
In one embodiment, the tristimulus values calculated based on the three primary color luminance data of the second light and the color coordinates of the vertex of the second color gamut of each pixel of the image are equal to the tristimulus values calculated based on the three primary color luminance data of the first light and the color coordinates of the vertex of the first color gamut of each pixel of the image.
In one embodiment, the step of determining the gamut range of the image comprises:
and calculating the color coordinates of each pixel according to the tricolor brightness data of each pixel of the image based on the second light and the color coordinates of the vertex of the second color gamut range, and judging the color gamut range of the image corresponding to the first image data according to the color coordinates of each pixel.
In one embodiment, the step of determining the gamut range of the image comprises:
calculating three primary color luminance data based on the first light for each pixel of the image according to the three primary color luminance data based on the second light, the color coordinates of the vertex of the second color gamut and the vertex color coordinates of the first color gamut for each pixel of the image, an
Judging the color gamut range of the image by judging whether the three-primary-color brightness data of each pixel of the image based on the first light is in a preset numerical range, if so, judging the image to be a narrow color gamut image and outputting the three-primary-color brightness data of each pixel of the image based on the first light as the second image data; and if the tricolor brightness data based on the first light of at least part of the tricolor brightness data based on the first light of each pixel of the image is not in the preset numerical value range, judging the image to be a wide color gamut image and outputting the first image data.
In one embodiment, the first light comprises three primary colors, and the color coordinate of the first primary color of the first light is xr、yrBrightness of YrThe color coordinate of the second primary color of the first light is xg、ygBrightness of Yg(ii) a The color coordinate of the third primary color of the first light is xb，ybBrightness of YbThe second light comprises three primary colors, and the color coordinate of the first primary color of the second light is xR、yRBrightness of YRThe color coordinate of the second primary color of the second light is xG、yGBrightness of YG(ii) a The color coordinate of the third primary color of the second light is xB，yBBrightness of YBThe color coordinates and the brightness of the first light and the second light satisfy the following formula:
Figure GDA0003302373110000041
in one embodiment, the first gamut range is a DCI gamut range and the second gamut range is a REC gamut range.
In one embodiment, the first light has fluorescence and the second light comprises laser light.
Compared with the prior art, the display device and the display method can not only realize the display of the image data with the wide color gamut, but also output the second image data and send the signal of the first light when the image belongs to the image with the narrow color gamut, modulate the first light according to the second image data to generate the image light, and do not use the second light source with the wide color gamut range when the color coordinates of each pixel of the first image data are all located in the first color gamut range because the first light is the light with the narrower color gamut than the second light, thereby reducing the light source cost.
Drawings
Fig. 1 is a schematic block diagram of a display device of the present invention.
Fig. 2 is a schematic diagram of the gamut range of the display device shown in fig. 1.
Fig. 3 is a flowchart illustrating a display method of the display apparatus shown in fig. 1.
Fig. 4 is a detailed flow chart of the first embodiment of the display method of fig. 3.
Fig. 5 is a detailed flow chart of a second embodiment of the method shown in fig. 3.
Description of the main elements
Display device 100
Light source device 110
Image data processing module 120
Light modulation device 130
Projection lens 140
First light source 111
Second light source 112
Light source controller 113
Optical and relay system 114
First gamut F1
Second gamut F2
Partial gamut range F
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Based on the technical problems that the wide color gamut light source (such as R, G, B three-color pure laser light source) can realize the color gamut standard of Rec.2020, but the cost is high (such as the red laser and the green laser are expensive and the electro-optical conversion efficiency is low), the invention provides the display device and the display method which can reduce the use of the wide color gamut light source. In general, in a portion of wide color gamut image data, not every frame of image has quite vivid colors, in other words, only a portion of image has particularly vivid colors of green or particularly red, and at this time, the light source is required to provide a larger color gamut area, and when other pictures are displayed, a smaller color gamut area can already cover all colors in the image, and in this period, a light source with a relatively narrower color gamut is used to replace the wide color gamut light source (such as a pure laser light source) as the light source of the display device, which can play a role in saving loss and cost of wide color gamut light (such as laser light), for example, a fluorescent light source with a narrower color gamut is used as the light source of the display device, which is low in cost and high in light efficiency.
However, when the color gamut is dynamically adjusted by using two light sources, namely, a wide color gamut and a narrow color gamut, it is necessary to determine which light source is selected as the excitation light for each frame of image in combination with the video signal, and when different light sources are used, the signals of the images are different, so that the process of implementing the dynamic color gamut requires synchronous processing on the image signals. The following describes in detail the specific structure and principle of the display device and the display method according to the present invention with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic block diagram of a display device 100 according to the present invention. In this embodiment, the display device 100 is mainly used as a projection device. Specifically, the display apparatus 100 includes a light source device 110, an image data processing module 120, a light modulation device 130, and a projection lens 140.
The light source device 110 is configured to emit a first light for modulating a narrow color gamut image (e.g., a first color gamut range image) and a second light for modulating a wide color gamut image (e.g., a second color gamut range image). Specifically, referring to fig. 2, fig. 2 is a schematic diagram of the gamut range of the display device 100 shown in fig. 1, where (the color coordinates or the gamut values of) all the pixels of the narrow-gamut image are located in the first gamut range F1, and (the color coordinates or the gamut values of) all the pixels of the wide-gamut image are located in the second gamut range F2, and where at least some of the (the color coordinates or the gamut values of) the pixels are located outside the first gamut range F1; wherein the second gamut range F2 covers the first gamut range F1 and has a partial gamut range F that exceeds the first gamut range F1. Specifically, the first color gamut F1 is a color gamut that the first light can exhibit, which may be a DCI color gamut, such as color gamut DCI-P3. The second color gamut range F2 may be an REC color gamut range, such as color gamut range rec.2020. It can be seen that the second light has a different color gamut range than the first light, and the color gamut range of the second light is significantly wider than the color gamut range of the first light. Specifically, the first light and the second light each include three primary colors, and the first light just can exhibit the first color gamut F1, and the second light can exhibit the second color gamut F2.
In this embodiment, the light source device 110 includes a first light source 111, a second light source 112, a light source controller 113, and an optical and relay system 114. The first light source 111 emits the first light, and the second light source 112 emits the second light.
Specifically, in an embodiment, the first light source 111 may include an excitation light source and a color wheel, the excitation light source emits excitation light, the color wheel is provided with a fluorescent material, the color wheel receives the excitation light and emits the first light, and the first light has fluorescence. The excitation light source may be a blue laser light source for emitting blue excitation light, and the color wheel may include at least two segment regions, wherein at least one segment region is provided with the fluorescent material, and each segment region emits one color light, and further the at least two segment regions may emit at least two color lights, such as blue light and yellow light or blue light, red light and green light. Wherein the yellow light contains red and green light components, i.e. the first light may comprise the three primary colors red, green and blue.
In a modified embodiment, the first light source 111 may also include a light emitting diode that emits the first light, and the first light has fluorescence, and specifically, the first light may include at least two color lights, such as blue light and yellow light or blue light, red light and green light.
In this embodiment, the second light source 112 includes a laser that emits laser light as the second light. Specifically, the second light may include three primary colors, that is, the second light source may include lasers of three primary colors, such as a red laser, a green laser, and a blue laser, for emitting a red laser, a green laser, and a blue laser as the second light.
The first light and the second light may be further provided to the light modulation device 130 after being adjusted by the optical and relay system 114 through light homogenizing, shaping, and the like, so that the light modulation device 130 may modulate the first light and the second light according to corresponding image data to generate image light. It is to be understood that, in a modified embodiment, the first light and the second light may be directly modulated by the optical modulation device 130 without being modulated by the optical and relay system 114.
The light source controller 113 is further configured to receive a light source control signal (e.g., a signal for emitting a first light or a signal for emitting a second light), and control the first light source 111 and the second light source 112 to be turned on and off based on the light source control signal, so that the light modulation device 130 modulates the corresponding light using the corresponding image data to obtain the image light.
The image DATA processing module 120 is configured to receive image DATA (hereinafter referred to as first image DATA) to be displayed. It is to be understood that the image to be displayed is at least one image, the first image data may include image data of the image, such as image data of one frame, specifically, the first image data includes luminance data of three primary colors (such as luminance data of three primary colors of red, green and blue) of each pixel of the image based on the second light, and it is to be understood that, since the second light modulates the second color gamut image, the first image data may also be regarded as including luminance data of three primary colors of each pixel of the image based on the second light.
The image data processing module 120 is further configured to determine a color gamut range of the image; when the image belongs to the narrow color gamut image, the image data processing module 120 transmits second image data obtained by converting three primary color luminance data of each pixel of the image based on the second light to the light modulation device 130 and transmits a signal for emitting the first light to the light source device 110; when the image belongs to the wide color gamut image, the image data processing module 120 transmits the first image data to the light modulation device 130 and transmits a signal for emitting the second light to the light source device 110.
Specifically, in this embodiment, the image data processing module 120 calculates the color coordinates of each pixel based on the three primary color luminance data of the second light and the color coordinates of the vertex of the second color gamut F2 of each pixel of the image, and determines the color gamut of the image corresponding to the first image data according to the color coordinates of each pixel.
Further, in this embodiment, the image data processing module 120 may calculate the first light-based three-primary color luminance data of each pixel of the image according to the second light-based three-primary color luminance data of each pixel of the image, the color coordinates of the vertex of the second color gamut and the color coordinates of the vertex of the first color gamut F1, to obtain the second image data. Specifically, the image data processing module 120 may obtain the second image data by calculating the tristimulus values based on the first light of the pixels of the image based on the tristimulus values of the first light of the pixels of the image based on the first light of the pixels of the image and the first color gamut F1 based on the principle that "the tristimulus values calculated based on the second light of the pixels of the image and the color coordinates of the vertex of the second color gamut F2 are equal to the tristimulus values calculated based on the first light of the pixels of the image based on the first color luminance data of the pixels of the image and the color coordinates of the vertex of the first color gamut F1".
Let the color coordinate of the first primary color of the first light be xr、yrBrightness of YrThe color coordinate of the second primary color of the first light is xg、ygBrightness of Yg(ii) a The color coordinate of the third primary color of the first light is xb、ybBrightness of Yb. It is to be understood that the color coordinates of the three primary colors of the first light may be regarded as the color coordinates of three vertices of a triangle of the first color gamut F1 (i.e., the color coordinates of the first color gamut F1), and the luminances of the three primary colors of the first light may be regarded as the maximum luminances of the primary colors that can be reached by the color coordinates at the three vertices. In particular, the color coordinates and the luminance x of a first primary color of the first lightr、yrAnd YrIt can also be regarded as the color coordinates (e.g. 0.680, 0.320) of the right lower vertex of the triangle of the first gamut F1 and the maximum brightness that can be achieved by the first primary color of the first light in the color gamut diagram of fig. 2. Color coordinates and luminance x of a second primary color of the first lightg、ygAnd YgIt can also be regarded as the color coordinates (e.g. 0.265, 0.690) of the upper vertex of the triangle of the first gamut F1 and the maximum brightness that can be achieved by the second primary color of the first light in the color gamut diagram of fig. 2. Color coordinates and luminance x of a third primary color of the first lightb、ybAnd Y isbThe color coordinates (e.g. 0.150, 0.060) of the vertex at the lower left of the triangle of the first gamut F1 and the maximum brightness that can be achieved by the third primary color of the first light in the color gamut diagram of fig. 2 can also be considered.
Let the color coordinate of the first primary color of the second light be xR、yRBrightness of YRThe color coordinate of the second primary color of the second light is xG、yGBrightness of YG(ii) a The color coordinate of the third primary color of the second light is xB、yBBrightness of YB. It will be appreciated that the color locus of the three primary colors of the second lightThe color coordinates of the three vertices of the triangle of the second color gamut F2 (i.e., the color coordinates of the second color gamut F2) may be regarded as the color coordinates, and the luminances of the three primary colors of the second light may be regarded as the maximum luminances of the primary colors that can be reached when the color coordinates are at the three vertices. In particular, the color coordinates and the luminance x of the first primary color of the second lightR、yRAnd YRIt can also be regarded as the color coordinates (e.g. 0.708, 0.282) of the right lower vertex of the triangle of the second gamut F2 and the maximum luminance that can be achieved by the first primary color of the second light in the color gamut diagram of fig. 2. Color coordinates and luminance x of a second primary color of the second lightG、yGAnd YGIt can also be regarded as the color coordinates (e.g. 0.170, 0.797) of the upper vertex of the triangle of the second gamut F2 and the maximum brightness that can be achieved by the second primary color of the second light in the color gamut diagram of fig. 2. Color coordinates and brightness x of a third primary color of the second lightB、yBAnd Y isBIt can also be regarded as the color coordinates (e.g. 0.131, 0.046) of the vertex at the lower left of the triangle of the second gamut F2 and the maximum luminance that can be achieved by the third primary color of the second light in the color gamut diagram of fig. 2.
In order to keep the color and brightness of the whole image consistent when the first light source 111 and the second light source 112 are dynamically switched, the white balance of the two light sources 111, 112 should have consistent color coordinates and brightness, for example, the color coordinate of the white balance is assumed to be xw、ywBrightness of YwIn particular, the white-balanced color coordinate xw、ywD65 (i.e., color coordinates 0.3127, 0.329) may be selected, while luminance YwIt is different according to the difference of brightness.
First, the tristimulus value X of any pixel0、Y0、Z0The relationship with the corresponding color coordinates x, y satisfies the following formula 1, which formula 1 is expressed as formula 2 in a matrix.
Figure GDA0003302373110000101
Figure GDA0003302373110000102
According to equation 2, the tristimulus value X of the pixel at white balanceW、YW、ZWThe following equation 3 is satisfied.
Figure GDA0003302373110000103
Further, it can be understood that when the first light is used to restore the picture, the tristimulus values at the time of white balance can also be calculated by using the maximum brightness and color coordinates of the three primary colors of the first light; when the image is modulated using the second light, tristimulus values at the time of white balance can also be calculated using the maximum luminance and color coordinates of the three primary colors of the second light. Thus, from the above principle and equations 1-3, it can be known that: at white balance, the tristimulus value X of the pixelW、YW、ZWThe following equation 4 is satisfied.
Figure GDA0003302373110000104
Figure GDA0003302373110000111
And a tristimulus value X of the pixel at white balanceW、YW、ZWThe following equation 4 is also satisfied.
Figure GDA0003302373110000112
In order to keep the color and brightness consistency of the whole image when the first light source 111 and the second light source 112 are dynamically converted, according to formula 4, the color coordinates and brightness of the first light and the second light need to satisfy the following formula 6, so as to ensure the color and brightness consistency of the whole image when the first light and the second light are dynamically converted.
Figure GDA0003302373110000113
Further, the following formula 7 can be obtained by substituting the known color coordinates and brightness values of the respective parameters into formula 1.
Figure GDA0003302373110000121
Thus, the luminances Y of the three primary colors of the first lightr、Yg、YbLuminance Y of three primary colors of the second lightR、YG、YBThe following formula 8 and formula 9 are satisfied, and the images can be matched with each other, so that when the first light and the second light are switched, the colors of the images displayed by the display device do not have difference of colors and brightness.
Figure GDA0003302373110000122
Figure GDA0003302373110000123
Assuming that the three primary color luminance data based on the second light of one pixel of the first image data is R, G, B, respectively, the formula for calculating the tristimulus value X, Y, Z of the pixel according to the three primary color luminance data R, G, B of the pixel and the color coordinates of the second color gamut F2 is as follows:
Figure GDA0003302373110000124
where M represents the maximum luminance data of three primary colors, such as 255 gray levels.
Since accurate restoration of data can be ensured only if the tristimulus value of each pixel is unchanged in the process of converting the tristimulus value data based on the second light of each pixel of the image into the tristimulus value data based on the first light, by using the principle that the tristimulus values are unchanged, assuming that the tristimulus value data based on the second light of any one pixel of the first image data is R, G, B respectively, and the corresponding tristimulus value data converted into the first light is r, g and b respectively, the tristimulus value X, Y, Z of the pixel is calculated by using the tristimulus value data r, g and b of the converted pixel and the color coordinates of the first color gamut F1, that is, the tristimulus value X, Y, Z also satisfies the following formula:
Figure GDA0003302373110000131
further substituting the known parameters into equations 10 and 11 can obtain equations 12 and 13:
Figure GDA0003302373110000132
Figure GDA0003302373110000133
when the three primary color luminance data R, G, B based on the second light of any one pixel of the first image data is known, the three primary color luminance data r, g, b based on the first light corresponding to the pixel can be calculated by combining the formula 8, the formula 9, the formula 12 and the formula 13, thereby obtaining the second image data.
For example, when the pixel is based on the tri-color luminance data of the second light (R, G, B) ═ 100, 160, 120, the pixel corresponds to the tri-stimulus value (X, Y, Z) ═ 0.4186YW,0.5569YW,0.5228YW) Yw can be obtained according to the selected white balance data, and then the corresponding tristimulus values (X, Y, Z) can be obtained,then, the above equations 8, 9, 12, and 13 are used to calculate (80,165,120) the three primary color luminance data (r, g, b) based on the first light corresponding to the pixel.
It will be appreciated that for any pixel, the tristimulus value (X) of that pixel is known by calculation0,Y0,Z0) According to said tristimulus value (X)0,Y0,Z0) The color coordinates x, y of the pixel can be calculated and obtained by a relational formula (such as formula 1 or formula 2) with the color coordinates of the pixel, so that the color gamut range of the image corresponding to the first image data can be judged according to the color coordinates x, y of each pixel of the first image data. The image data processing module 120 may calculate the tristimulus values of the pixels of the first image data according to the above principle to obtain the color coordinates of the pixels, and further determine the color gamut range of the image corresponding to the first image data according to the color coordinates of the pixels, that is, whether the image is a narrow color gamut image or a wide color gamut image. It is to be understood that, as mentioned above, if all pixels of the image are located in the first color gamut range, the image is the narrow color gamut image; if all pixels of the image are located within the second color gamut range and at least a portion of the pixels are located outside the first color gamut range, the image is the wide color gamut image.
It is to be understood that, in an alternative embodiment, the image data processing module 120 may also determine the gamut range of the first image data by: the image data processing module 120 calculates three-primary-color luminance data of each pixel of the image based on the first light according to the three-primary-color luminance data of each pixel of the image based on the second light, the color coordinates of the vertex of the second color gamut F2, and the color coordinates of the vertex of the first color gamut F1, and determines whether the three-primary-color luminance data of each pixel of the image based on the first light are all within a predetermined range of values to determine the color gamut of the image. If the first light-based three-primary-color luminance data of each pixel of the image is within the predetermined numerical range, the image data processing module 120 determines that the image is a narrow color gamut image and transmits the first light-based three-primary-color luminance data of each pixel of the image to the light modulation device 130 as the second image data; if the first light-based three-primary color luminance data of at least some of the first light-based three-primary color luminance data of each pixel of the image is not within the predetermined numerical range, the image data processing module 120 determines that the image is a wide color gamut image and transmits the first image data to the light modulation device 130. Wherein the predetermined numerical range is [ 0, M ], as described above, M represents the maximum luminance data of three primary colors, such as 255 gray scale, that is, the predetermined numerical range is [ 0-255 ].
The steps of calculating the tristimulus value of each pixel according to the tristimulus luminance data (R, G, B) of each pixel of the first image data and the color coordinates of the second color gamut F2, and then calculating the tristimulus value (R, G, B) of each pixel based on the tristimulus luminance data (R, G, B) of each pixel based on the first color gamut F1 based on the tristimulus values of each pixel and the color coordinates of the first color gamut F1 are described in detail above, that is, the steps of calculating the tristimulus luminance data (R, G, B) of each pixel based on the first color gamut F1 by referring to the known parameters and equations 8, 9, 12 and 13 are not repeated herein.
Further, it is determined whether the luminance data r, g, b are all within a predetermined numerical range of [ 0, M ] (e.g., [ 0,255 ]) based on the three primary color luminance data (r, g, b) of the first color gamut F1 from each pixel obtained by the calculation. It is to be understood that if the three primary color luminance data of the pixel based on the first gamut F1 is within the predetermined range of values, it indicates that the data (R, G, B) to be displayed by the pixel can be restored by modulating the first light with the luminance data (R, G, B) based on the first gamut F1, i.e. the gamut of the pixel is within the first gamut, and the image is the narrow-gamut image. If the three primary color luminance data of the pixel based on the first color gamut F1 is not within the predetermined value range, such as a negative number (e.g., -1) or greater than the maximum luminance data M (e.g., 256), it means that the data (R, G, B) to be displayed by the pixel cannot be reduced by modulating the first light with the luminance data (R, G, B) based on the first color gamut F1, i.e., the color gamut of the pixel is determined to be outside the first color gamut F1, and the image is the wide color gamut image. By calculating and judging whether the luminance data (r, g, b) based on the first color gamut F1 of all the pixels of the first image data based on the second color gamut of one image is within the predetermined numerical value range [ 0, M ], the color gamut of the first image data, that is, whether the image is a narrow color gamut image or a wide color gamut image, can be known. Further, it is understood that, if the luminance data of each pixel of the first image data based on the three primary colors in the first color gamut range F1 is within the predetermined value range, that is, the image data processing module 120 determines that the color gamut range of the first image data is within the first color gamut range F1, that is, the image is a narrow color gamut image, the image data processing module 120 may directly use the luminance data (r, g, b) of each pixel calculated in the above determining step based on the first color gamut range F1 as the second image data, and further provide the second image data to the light modulation device 130 without re-conversion and calculation.
The light source controller 113 is configured to receive the signal for emitting the first light and the signal for emitting the second light, and the light source controller 113 receives the signal for emitting the first light to control the first light source 111 to turn on and the second light source 112 to turn off, so that the light source device 110 emits the first light; the light source controller 113 receives the signal for emitting the second light to control the second light source 112 to be turned on and the first light source 111 to be turned off, so that the light source device 110 emits the second light.
The light modulation device 130 is configured to modulate the first light according to the second image data to obtain image light when the image corresponding to the first image data is the narrow color gamut image. The light modulation device 130 is further configured to modulate the second light according to the first image data to obtain image light when the image corresponding to the first image data is the wide color gamut image.
Specifically, when the image corresponding to the first image data is the narrow color gamut image, the light modulation device 130 receives the second image data output by the image data processing module 120, and the light source controller 113 controls the light source device 110 to emit the first light to the light modulation device, so that the light modulation device 130 modulates the first light according to the second image data to obtain the image light in the first color gamut range F1.
When the image corresponding to the first image data is the wide color gamut image, the light modulation device 130 receives the first image data output by the image data processing module 120, and the light source controller 113 controls the light source device 110 to emit the second light to the light modulation device 130, so that the light modulation device 130 further modulates the second light according to the first image data to obtain image light, thereby obtaining image light of a second color gamut F2 outside the first color gamut F1.
In one embodiment, the light modulation module 132 may include a spatial light modulator that modulates the first light according to the second image data during a first period of time, and the spatial light modulator modulates the second light according to the first image data during a second period of time. That is, the spatial light modulator modulates the first light and the second light in a time-sharing manner. The spatial light modulator may be a DMD spatial light modulator, an LCOS spatial light modulator, or an LCD spatial light modulator, but is not limited thereto.
In another embodiment, the light modulation module 132 includes a first spatial light modulator and a second spatial light modulator, the first spatial light modulator modulates the first light according to the second image data, and the second spatial light modulator modulates the second light according to the first image data. That is, the first image data and the second light corresponding thereto and the second image data and the first light corresponding thereto are image-modulated using different spatial light modulators, respectively. The first and second spatial light modulators may be, but are not limited to, a DMD spatial light modulator, an LCOS spatial light modulator, or an LCD spatial light modulator.
The projection lens 140 projects the image light emitted from the light modulation device 130 to display an image.
Further, referring to fig. 3, fig. 3 is a flowchart illustrating a display method of the display apparatus 100 shown in fig. 1. A display method of the display apparatus 100 is explained below with reference to fig. 3, and the display method includes the following steps S1-S4.
A step S1 of providing a first light for modulating a narrow color gamut image and a second light for modulating a wide color gamut image; all of the pixels of the narrow color gamut image are located within a first color gamut range F1, all of the pixels of the wide color gamut image are located within a second color gamut range F2, and wherein at least some of the pixels are located outside the first color gamut range; wherein the second gamut range F2 covers the first gamut range and has a portion that is beyond the first gamut range F1. Specifically, the first light and the second light can be provided by the light source device 110. The specific structure of the light source device 110 and the specific requirements of the first light and the second light are described above, and are not described herein again.
Step S2, receiving first image data, the first image data including three primary color luminance data of each pixel of an image based on the second light. The first image data may be an image data, such as a frame of image data.
A step S3 of determining the color gamut of the image, and if the image belongs to the narrow color gamut image, executing steps S4 and S6; when the image belongs to the wide color gamut image, steps S5 and S7 are performed.
In step S4, the second image data and the signal for emitting the first light are output. Step S6, modulating the first light according to the second image data to generate image light.
Step S5, outputting the first image data and a signal for emitting the second light. Step S7, modulating the second light according to the first image data to generate image light.
Specifically, referring to fig. 4, fig. 4 is a detailed flowchart illustrating a first embodiment of the method shown in fig. 3. In the first embodiment, the step S3 may specifically include the following steps S31 and S32. Step S31: calculating the tristimulus value of each pixel according to the three-primary-color brightness data of each pixel and the color coordinate of the second color gamut range, and then calculating the color coordinate of each pixel according to the tristimulus value, step S32: and judging the color gamut range of the image corresponding to the first image data according to the color coordinates of the pixels. Wherein the step S3 can be executed by the image data processing module 120.
When the image belongs to the narrow color gamut image, the step S4 may include the steps of:
calculating tristimulus values of the pixels according to the tristimulus values of the pixels and the color coordinates of the second color gamut range, and calculating the first light-based tristimulus values of the pixels of the image according to the tristimulus values of the pixels of the image and the vertex color coordinates of the first color gamut range to obtain second image data; and
the second image data is output to the light modulation device 130 and the signal for emitting the first light is output to the light source device 110. Wherein, the step S4 may also be executed by the image data processing module 120. Further, in step S6, the light source device 110 emits the first light according to the signal for emitting the first light, and the light modulation device 130 receives the second image data and the first light emitted by the light source device 110 and modulates the first light according to the second image data to generate image light. The projection lens 140 projects the image light emitted from the light modulation device 130 to display an image.
When the image belongs to the wide color gamut image, in step S5, the image data processing module 120 outputs the first image data to the light modulation device 130 and outputs a signal for emitting the second light to the light source device 110, wherein step S5 may be executed by the image data processing module 120. Further, in step S7, the light source device 110 emits the second light according to the signal for emitting the second light, and the light modulation device 130 receives the first image data and the second light emitted by the light source device 110 and modulates the second light according to the first image data to generate image light. The projection lens 140 projects the image light emitted from the light modulation device 130 to display an image.
Specifically, referring to fig. 5, fig. 5 is a detailed flowchart illustrating a second embodiment of the method shown in fig. 3. In the second embodiment, the step S3 may specifically include the following steps S33, S34 and S35.
Step S33, calculating tristimulus values of the pixels of the image based on the three primary color luminance data of the second light and the color coordinates of the vertex of the second color gamut range;
step S34, calculating the first light-based tricolor brightness data of each pixel of the image according to the tristimulus values and the vertex color coordinates of the first color gamut, and
in step S35, it is determined whether the three primary color luminance data of each pixel of the image based on the first light is within a predetermined numerical range to determine the color gamut of the image.
If the three-primary-color brightness data of each pixel of the image based on the first light are all in the preset numerical range, judging the image to be a narrow color gamut image; and if the tricolor brightness data based on the first light of at least part of the tricolor brightness data based on the first light of each pixel of the image is not in the preset numerical range, judging the image to be a wide color gamut image. Wherein the step S3 can be executed by the image data processing module 120.
When the image belongs to the narrow color gamut image, in step S4, the three primary color luminance data based on the first light of each pixel of the image obtained by the above calculation is output as the second image data and a signal for emitting the first light is output to the light source device 110, and further, in step S6, the light source device emits the first light in accordance with the signal for emitting the first light, and the light modulation device receives the second image data and the first light emitted by the light source device and modulates the first light in accordance with the second image data to generate the image light. The projection lens 140 projects the image light emitted from the light modulation device 130 to display an image.
When the image belongs to the wide color gamut image, in step S5, the image data processing module 120 outputs the first image data to the light modulation device 130 and outputs a signal for emitting the second light to the light source device 110, wherein step S5 may be executed by the image data processing module 120. Further, in step S7, the light source device 110 emits the second light according to the signal for emitting the second light, and the light modulation device 130 receives the first image data and the second light emitted by the light source device 110 and modulates the second light according to the first image data to generate image light. The projection lens 140 projects the image light emitted from the light modulation device 130 to display an image.
Compared with the prior art, the display device 100 and the display method of the invention can not only realize the display of the image data with the wide color gamut, but also modulate the first light according to the second image data obtained by converting the color gamut range to generate the image light when the first image data is based on the image data with the second color gamut range but the color coordinates of each pixel of the first image data are all located in the first color gamut range, and because the first light is the light with the narrower color gamut than the second light, the second light source with the wider color gamut can not be used when the color coordinates of each pixel of the first image data are all located in the first color gamut range, thereby reducing the light source cost. In addition, in the display device and the display method of the present invention, the second image data based on the three-primary-color luminance data of the first light is obtained for each pixel according to the three-primary-color luminance data of each pixel, the color coordinate of the second color gamut range, and the color coordinate of the first color gamut range, and the first light is modulated according to the second image data, so that the display device and the display method can accurately restore the image to be displayed, and the display effect is good.
Further, by making the color coordinates and the brightness of the first light and the second light satisfy the following formula 6, the color and brightness consistency of the whole picture can be ensured when the first light and the second light are dynamically converted, and therefore the display effect of the display device 100 is better.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (12)

1. A display device, characterized in that the display device comprises:
a light source device for emitting first light for modulating a narrow color gamut image and second light for modulating a wide color gamut image; all pixels of the narrow color gamut image are located within a first color gamut range, all pixels of the wide color gamut image are located within a second color gamut range, and at least a portion of the pixels are located outside the first color gamut range; wherein the second gamut range covers the first gamut range and has a portion that is outside of the first gamut range;
the image data processing module is used for receiving first image data, and the first image data comprises three-primary-color brightness data of each pixel of an image based on the second light; the image data processing module is also used for judging the color gamut range of the image; when the image belongs to the narrow color gamut image, the image data processing module transmits second image data obtained by converting three primary color brightness data of each pixel of the image based on the second light to a light modulation device and transmits a signal for emitting the first light to the light source device; when the image belongs to the wide color gamut image, the image data processing module transmits the first image data to a light modulation device and transmits a signal for emitting second light to the light source device;
the light modulation device is used for modulating the second light or the first light emitted by the light source device according to the first image data or the second image data transmitted by the image data processing module.
2. The display device of claim 1, wherein: the image data processing module calculates the three-primary-color luminance data of each pixel of the image based on the first light according to the three-primary-color luminance data of each pixel of the image based on the second light, the color coordinates of the vertex of the second color gamut range, and the color coordinates of the vertex of the first color gamut range to obtain the second image data.
3. The display device of claim 2, wherein: a tristimulus value calculated from the three primary color luminance data of the second light and the color coordinate of the vertex of the second gamut of each pixel of the image is equal to a tristimulus value calculated from the three primary color luminance data of the first light and the color coordinate of the vertex of the first gamut of each pixel of the image.
4. The display device of claim 3, wherein: the image data processing module calculates tristimulus values of each pixel of the image based on the tristimulus values of the second light and the color coordinates of the vertex of the second color gamut range, and calculates the tristimulus values of each pixel of the image based on the first light based on the tristimulus values of each pixel and the color coordinates of the vertex of the first color gamut range to obtain the second image data.
5. The display device according to claim 1, wherein the image data processing module calculates color coordinates of each pixel based on the three primary color luminance data of the second light and the color coordinates of the vertex of the second color gamut of each pixel of the image, and determines the color gamut of the image corresponding to the first image data based on the color coordinates of each pixel.
6. The display device according to claim 1, wherein the image data processing module calculates three primary color luminance data based on the first light for each pixel of the image based on three primary color luminance data based on the second light, color coordinates of a vertex of the second color gamut range, and color coordinates of a vertex of the first color gamut range for each pixel of the image, and determining whether the three primary color luminance data of each pixel of the image based on the first light is within a predetermined numerical range to determine the color gamut range of the image, if the three primary color luminance data of each pixel of the image based on the first light is within the predetermined numerical range, the image data processing module judges that the image is a narrow color gamut image and transmits three-primary-color brightness data based on the first light of each pixel of the image to the light modulation device as the second image data; if the tricolor brightness data based on the first light of at least part of the tricolor brightness data based on the first light of each pixel of the image is not in the preset numerical value range, the image data processing module judges that the image is a wide color gamut image and transmits the first image data to the light modulation device.
7. The display device of claim 1, wherein the first light comprises three primary colors, and a color coordinate of the first primary color of the first light is xr、yrBrightness of YrThe color coordinate of the second primary color of the first light is xg、ygBrightness of Yg(ii) a The color coordinate of the third primary color of the first light is xb，ybBrightness of YbThe second light comprises three primary colors, and the color coordinate of the first primary color of the second light is xR、yRBrightness of YRThe color coordinate of the second primary color of the second light is xG、yGBrightness of YG(ii) a The color coordinate of the third primary color of the second light is xB，yBBrightness of YBThe color coordinates and the brightness of the first light and the second light satisfy the following formula:
Figure FDA0003302373100000031
8. the display device of claim 1, wherein the first gamut range is a DCI gamut range and the second gamut range is a REC gamut range.
9. The display device as claimed in claim 1, wherein the light source device comprises a light source controller, a first light source and a second light source, the light source controller is configured to receive the signal for emitting the first light and the signal for emitting the second light, the light source controller receives the signal for emitting the first light to control the first light source to be turned on and the second light source to be turned off, and the light source controller receives the signal for emitting the second light to control the second light source to be turned on and the first light source to be turned off.
10. The display device according to claim 1, wherein the light source device includes a first light source and a second light source, the first light source includes an excitation light source and a color wheel, the excitation light source emits excitation light, the color wheel is provided with a fluorescent material, the color wheel receives the excitation light and emits the first light, the first light has fluorescence, and the second light source includes a laser that emits laser light as the second light.
11. The display device according to claim 1, wherein the light source device includes a first light source and a second light source, the first light source includes a light emitting diode that emits the first light having fluorescence, and the second light source includes a laser that emits laser light as the second light.
12. A display method, characterized in that the display method comprises the steps of:
providing first light for modulating a narrow color gamut image and second light for modulating a wide color gamut image; all pixels of the narrow color gamut image are located within a first color gamut range, all pixels of the wide color gamut image are located within a second color gamut range, and at least a portion of the pixels are located outside the first color gamut range; wherein the second gamut range covers the first gamut range and has a portion that is outside of the first gamut range;
receiving first image data, wherein the first image data comprises three primary color brightness data of each pixel of an image based on the second light;
judging the color gamut range of the image, and outputting second image data and a signal for emitting first light when the image belongs to the narrow color gamut image, wherein the second image data is obtained by converting the three-primary-color brightness data of each pixel of the image based on the second light; outputting the first image data and a signal to emit second light when the image belongs to the wide color gamut image; and
modulating the first light according to the second image data or modulating the second light according to the first image data.
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