CN109658875B - Color gamut control method and display device thereof - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000003086 colorant Substances 0.000 claims abstract description 26
- 238000009877 rendering Methods 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 2
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- 238000010586 diagram Methods 0.000 description 4
- 239000002096 quantum dot Substances 0.000 description 3
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
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Abstract
The application discloses a color gamut control method and a display device thereof. The method comprises the following steps: acquiring display data of an image, wherein the display data comprises gray scale data of a plurality of pixel units, and each pixel unit comprises a plurality of sub-pixels with different colors; calculating a difference value between gray scale data of the sub-pixels of different colors; identifying the image type according to the difference value; the state switching between the first light source assembly and the second light source assembly is controlled according to the image type, and the color gamut range provided by the first light source assembly is wider than that provided by the second light source assembly. According to the invention, the gray scale data of the sub-pixels with different colors are differentiated, the difference values which are larger than the first threshold value are counted, accumulated and summed and then compared with the total difference value to determine the image type, the state switching of the LED lamp with the high color gamut and the LED lamp with the low color gamut is controlled according to the image type, the switching of the color gamut mode of the display device is automatically completed, and the user experience satisfaction is improved. And the display device does not need to be provided with a peripheral switch circuit for controlling the color gamut, thereby reducing the production cost.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a color gamut control method and a display device thereof.
Background
In the display field, color gamut is used to represent the range of colors that a display device can express. In a liquid crystal display device, a backlight is one of main factors affecting a color gamut of a display image. The average color rendering index of the light source component in the backlight source is in direct proportion to the color gamut range, and the color rendering index of the LED lamp is in inverse proportion to the luminous efficiency, so that the wider the color gamut range that the backlight source can provide, the lower the luminous efficiency, the greater the power consumption of the backlight source.
When the image of the display device is in the entertainment mode, the color gamut of the image is in the high color gamut mode, and when the image of the display device is in the office mode, the colors are mostly in the black, white and gray state, and the color gamut of the image is in the low color gamut mode. In order to satisfy the picture display effect of the display device, the color gamut range required to be provided by the backlight of the display device at least needs to satisfy the normal display of the high-color-gamut image. However, when the image displayed by the display device is in the low color gamut mode, the backlight of the display device displays the image displayed in the low color gamut mode with relatively more energy, which causes energy waste, and thus causes unnecessary energy consumption of the backlight.
Therefore, there is a need to provide an improved technical solution to overcome the above technical problems in the prior art.
Disclosure of Invention
The present invention provides a color gamut control method and a display device thereof, which automatically complete the switching of the color gamut mode without setting some peripheral switch circuits supporting the switching of the color gamut mode.
According to the present invention, there is provided a color gamut control method comprising the steps of:
the main control module identifies the image type of the display device, and generates and sends a first control signal according to the acquired image type;
preferably, the timing controller acquires the first control signal and controls switching of states between the first light source assembly and the second light source assembly according to the first control signal.
Preferably, the main control module obtains display data of an image, the display data includes grayscale data of a plurality of pixel units, each pixel unit includes a plurality of sub-pixels with different colors, and the main control module calculates a difference value between the grayscale data of the sub-pixels with different colors;
preferably, the first light source assembly has a higher average color rendering than the second light source assembly.
Preferably, the difference value is obtained by subtracting the gray scale data of two adjacent sub-pixels with different colors.
Preferably, the two adjacent sub-pixels with different colors are sub-pixels in the same pixel unit or sub-pixels in different pixel units.
Preferably, the sub-pixels with the difference values larger than the first threshold are counted and accumulated and summed to obtain a count value, and the count value is compared with the total difference value to identify the image type.
Preferably, the count value is not less than one fourth of the total number of differences, the image type is a high color gamut image, the count value is less than one fourth of the total number of differences, and the image type is a low color gamut image.
Preferably, the image type is a high-gamut image, the first light source assembly is turned on, and the second light source assembly is turned off.
Preferably, the image type is a low color gamut image, the second light source assembly is turned on, and the first light source assembly is turned off.
Preferably, the first threshold is set according to a sensitivity of human eyes to color recognition.
According to another aspect of the present invention, there is provided a display device in which the above-described color gamut control method is performed.
Compared with the prior art, the color gamut control method and the display device thereof provided by the invention have the advantages that the gray scale data of the sub-pixels with different colors are differentiated, the difference values larger than the first threshold are counted, accumulated and summed and then compared with the total difference value to determine the image type, the automatic switching of the states of the first light source component and the second light source component is controlled according to the image type, and the switching of the color gamut mode of the display device is automatically completed. The method and the device have the advantages that the image display effect is guaranteed to be unchanged, meanwhile, the color gamut range provided by the backlight source is switched in real time according to the image type identification result of the data to be displayed, and the power consumption of the backlight source is reduced. The invention automatically completes the switching of the color gamut mode by the color gamut control method, thereby improving the satisfaction degree of user experience.
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The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a schematic structural diagram of a display device of the present invention.
Fig. 2 shows a flow chart of the color gamut control method in the present invention.
Fig. 3 is a schematic flow chart illustrating the process of identifying the image type according to the difference in the present invention.
FIG. 4a shows a graph of the difference of the images according to the first embodiment of the invention; fig. 4b shows a graph of a high gamut signal distribution in an image according to the first embodiment of the invention.
FIG. 5a shows a graph of image difference values for a second embodiment of the invention; fig. 5b shows a diagram of a high gamut signal distribution in an image according to the second embodiment of the invention.
FIG. 6a shows a graph of image difference values for a third embodiment of the present invention; fig. 6b shows a graph of a high gamut signal distribution in an image according to the third embodiment of the invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. In addition, certain well known components may not be shown.
In the following description, numerous specific details of the invention are set forth, such as partial data diagrams of certain images, in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
The present invention may be embodied in various forms, some of which will be described below.
Fig. 1 shows a schematic structural diagram of a display device of the present invention.
The display device 100 includes a CPU110, a timing control module 120, a first driving module 131, a second driving module 132, and a backlight 140. The backlight source 140 includes a first light source assembly 141 and a second light source assembly 142 respectively driven by the first driving module 131 and the second driving module 132, wherein the first light source assembly 141 can provide a color gamut higher than the second light source assembly 142. The timing control module 120 receives the image signal output by the CPU110, and by determining the type of the image signal, the first driving module 131 drives only the first light source assembly 141 to be turned on when the image signal is a video signal, and the second driving module 132 drives only the second light source assembly 142 to be turned on when the image signal is a text signal. When the image signal is in the low color gamut mode, the display device switches the second light source assembly 142 with a smaller color gamut range to work, and reduces the power consumption of the backlight source while ensuring that the image brightness effect is unchanged.
Fig. 2 shows a flow chart of the color gamut control method in the present invention.
As shown in fig. 2, the color gamut control method includes the steps of:
s01: and acquiring display data of the image gray scale data. The main control module acquires display data of Image gray scale data, the display data comprises gray scale data of a plurality of pixel units in an Image, each pixel unit comprises a plurality of sub-pixels with different colors, and the gray scale data of all the pixel units in the Image is acquired, for example, the gray scale data is acquired by performing a mode taking operation on the Image by using pixel mode taking software Image3 LCD.
S02: the difference between the gray-scale data of the sub-pixels of different colors is calculated. The main control module calculates a difference value between gray scale data of two adjacent sub-pixels with different colors, for example, the gray scale data of a first sub-pixel R in a first pixel unit in the same row is subtracted from the gray scale data of a second sub-pixel G to obtain a difference value, the gray scale data of the second sub-pixel G is subtracted from the gray scale data of a third sub-pixel B to obtain a difference value, the gray scale data of the third sub-pixel B is subtracted from the gray scale data of the first sub-pixel R in an adjacent second pixel unit to obtain a difference value, and the difference value of the first row is obtained by analogy so as to obtain the difference value between the gray scale data of the sub-pixels with different colors in the whole image. The two adjacent sub-pixels with different colors may be sub-pixels in the same pixel unit, or sub-pixels in different pixel units.
S03: and identifying the image type according to the difference value, and generating and sending a first control signal according to the acquired image type. The main control module identifies the image type according to the difference value, and identifies and determines the image type through the difference value between the gray scale data of the sub-pixels with different colors.
Specifically, fig. 3 is a schematic flow chart illustrating the process of identifying the image type according to the difference in the present invention.
As shown in fig. 3, the specific steps for identifying the image type according to the difference value are as follows:
s31: and counting the sub-pixels with the difference values larger than the first threshold value and accumulating and summing. And accumulating and summing all the high color gamut signals in the image to obtain a count value SUM, wherein the count value SUM represents the total number of the high color gamut signals in the image. In this embodiment, the first threshold K is, for example, 45. The preset first threshold K can be set according to the sensitivity of human eyes to color recognition through large-scale theoretical statistics. Any one color can be selected, for example, green, the color with darker ends and white ends is defined as the color in office mode, the color in the middle area is defined as the color in high color gamut mode, and then the first threshold K is set according to regular statistics. Preferably, the first threshold K may be obtained by superimposing the two methods described above.
S32: the count value is compared to the total number of differences to identify the image type. And comparing the count value representing the total number of the high color gamut signals in the image with the total number of the difference values between the sub-pixel data of different colors in the image, and further identifying the type of the graph. Preferably, the count value is compared with one fourth of the total number of differences, the count value is not less than one fourth of the total number of differences, the image type is a high color gamut image, the count value is less than one fourth of the total number of differences, and the image type is a low color gamut image.
S04: the time schedule controller acquires a first control signal and controls the switching of the state between the first light source component and the second light source component according to the first control signal, the time schedule controller controls the driving chip according to the image type and then controls the switching of the state between the first light source component and the second light source component, and the color gamut of the first light source component is higher than that of the second light source component. The image type is a high-color-gamut image, the first light source component is turned on, and the second light source component is turned off; the image type is a low color gamut image, the second light source assembly is turned on, and the first light source assembly is turned off. The color gamut range which can be displayed by the first light source component and the color gamut range which can be displayed by the second light source component are different, for example, a plurality of LED lamps in the first light source component are quantum dot light-emitting diodes, and the quantum dot light-emitting diodes are packaged into a whole with the blue light-emitting diodes through quantum dot films; for example, the plurality of LED lamps in the second light source assembly are common light emitting diodes. The connection manner of the LED lamps in the two lamp sets is well known to those skilled in the art, and therefore, is not described herein again.
In this embodiment, when the number of high-gamut signals reaches at least one-fourth of the entire screen of the image, the image type is considered as a high-gamut image. However, the implementation of the invention is not limited thereto, and the definition condition for the high-gamut image may be adjusted according to the sensitivity of human eyes to color recognition.
The color gamut control method determines the image type by comparing the difference value which is greater than the first threshold value after the difference value is counted, accumulated and summed with the total number of the difference values by differentiating the gray scale data of the sub-pixels with different colors, and controls the state switching of the first light source component and the second light source component according to the image type, thereby realizing the switching of the color gamut mode of the display device, ensuring the unchanged image brightness effect and reducing the power consumption of the backlight source according to the image type. And the image type is determined by utilizing the color gamut control method, so that the color gamut mode of the display device is automatically switched, the manual operation of a client is reduced, and the user experience satisfaction is improved.
The invention also provides a display device, which executes the color gamut control method to further automatically realize the switching of the color gamut mode, and reduces the power consumption of the backlight source according to the image type while ensuring that the image brightness effect is not changed.
In the following first to third embodiments, the number of differences between the gray scale data of the sub-pixels of different colors in the image is larger, and the amount of data for representing the high color gamut signal in the image is also larger, and in order to show the image in each embodiment more clearly, the intermediate data has been hidden in the corresponding drawing.
FIG. 4a shows a graph of the difference of the images according to the first embodiment of the invention; fig. 4b shows a graph of the image high gamut signal distribution according to the first embodiment of the present invention.
The image in the first embodiment is the image 1, and the image type of the image 1 is determined by the steps S01, S02, and S03 of the above-described color gamut control method, wherein the step S03 includes the steps S31 and S32.
As shown in fig. 4a and 4b, the resolution of the image 1 in the first embodiment is 1024 × 768, and the image 1 is a movie picture. Image 1 is subjected to pixel modulo software to obtain gray scale data for all sub-pixels according to step S01, and the difference in gray scale data between the sub-pixels of different colors of image 1 is obtained as shown in fig. 4a through step S02. The first threshold K in this embodiment is, for example, 45, and the definition condition of the high gamut image is, for example, that the high gamut signal occupies at least one fourth of the whole screen of the image in the image. Further, the high color gamut signal distribution of the image 1 as shown in fig. 4b is obtained through step S31, where "0" in fig. 4b indicates that there is no high color gamut signal and "1" indicates that there is a high color gamut signal. The count SUM characterizing the number of high gamut signals of image 1 is 627804, where the high gamut image defining value G of image 1 is: g ═ G (row resolution × 3-1) × column resolution × 1/4, SUM > G ═ 1024 × 3-1 × (768 × 1/4) ═ 589632 in the present embodiment, so image 1 is a high gamut image, and therefore the image is in the entertainment mode.
FIG. 5a shows a graph of image difference values for a second embodiment of the invention; fig. 5b shows a graph of an image high gamut signal distribution according to the second embodiment of the present invention.
The image in the second embodiment is the image 2, and the image type of the image 2 is determined by the steps S01, S02, and S03 of the above-described color gamut control method, wherein the step S03 includes the steps S31 and S32.
As shown in fig. 5a and 5b, the resolution of the image 2 in the second embodiment is 1024 × 768, and the image 2 is an EXCEL form screen. Image 2 is subjected to pixel modulo software to obtain gray scale data for all sub-pixels in accordance with step S01, and the difference in gray scale data between the sub-pixels of different colors of image 2 is obtained as shown in fig. 5a by step S02. The first threshold K in this embodiment is, for example, 45, and the definition condition of the high gamut image is, for example, that the high gamut signal occupies at least one fourth of the whole screen of the image in the image. Further, the high color gamut signal distribution of the image 2 as shown in fig. 5b is obtained through step S31, where "0" in fig. 5b indicates that there is no high color gamut signal and "1" indicates that there is a high color gamut signal. The count SUM characterizing the number of high gamut signals of image 2 is 177201, where the high gamut image defining value G of image 2 is: g ═ G (row resolution × 3-1) × column resolution × 1/4, SUM < G ═ (1024 × 3-1) × (768 × 1/4) ═ 589632 in the present embodiment, so the image 2 is a low gamut image, and therefore the image is in the office mode.
FIG. 6a shows a graph of image difference values for a third embodiment of the present invention; fig. 6b shows a graph of an image high gamut signal distribution according to the third embodiment of the present invention.
The image in the third embodiment is the image3, and the image type of the image3 is determined by the steps S01, S02, and S03 of the above-described color gamut control method, wherein the step S03 includes the steps S31 and S32.
As shown in fig. 6a and 6b, the resolution of the image3 in the third embodiment is 608 × 380, and the image3 is a CAD operation screen. Image3 is subjected to pixel modulo software to obtain gray scale data for all sub-pixels according to step S01, and the difference in gray scale data between the sub-pixels of different colors of image3 is obtained as shown in fig. 6a by step S02. The first threshold K in this embodiment is, for example, 45, and the definition condition of the high gamut image is, for example, that the high gamut signal occupies at least one fourth of the whole screen of the image in the image. Further, the high color gamut signal distribution of the image3 as shown in fig. 6b is obtained through step S31, where "0" in fig. 6b indicates that there is no high color gamut signal and "1" indicates that there is a high color gamut signal. The count SUM characterizing the number of high gamut signals of the image3 is 52679, where the high gamut image defining value G of the image3 is: g ═ G (row resolution × 3-1) × column resolution × 1/4, SUM < G ═ (608 × 3-1) × (380 × 1/4) ═ 350016 in the present embodiment, so image3 is in low color gamut, and therefore the image is in office mode.
It should be noted that, in the industrial experiment, at the moment when the input side circuit of the notewood LED Driver is powered on, the inrush current is calculated according to the specific formula W ═ Pt ═ 3.08 × 10-4w.s (the normal model is taken as an example), and the power consumption per unit time of a single LED lamp in normal operation is: in contrast, since the power consumption per unit time inrush current is much smaller than the power consumption per unit time in normal operation of the LED lamp, when Pt is 2.27(w.s), even if the two groups of LED lamps having different color ranges are frequently switched, no energy loss occurs.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In accordance with the present invention, the foregoing examples are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. A color gamut control method characterized by comprising the steps of:
the main control module identifies the image type of the display device, and generates and sends a first control signal according to the acquired image type;
the time schedule controller obtains the first control signal and controls the switching of the state between the first light source component and the second light source component according to the first control signal,
the main control module obtains display data of an image, the display data comprises gray scale data of a plurality of pixel units, each pixel unit comprises a plurality of sub-pixels with different colors, the main control module calculates difference values between the gray scale data of the sub-pixels with different colors, counts the sub-pixels with the difference values larger than a first threshold value, accumulates and sums the sub-pixels to obtain count values, and compares the count values with the total number of the difference values to identify the type of the image.
2. The method of claim 1, wherein the difference value is obtained by subtracting gray scale data of two adjacent sub-pixels with different colors, and the two adjacent sub-pixels with different colors are sub-pixels in the same pixel unit or sub-pixels in different pixel units.
3. The method according to claim 1, wherein the count value is not less than one fourth of the total number of differences, the image type is a high color gamut image, the count value is less than one fourth of the total number of differences, and the image type is a low color gamut image.
4. The method of claim 3, wherein the image type is a high gamut image, the first light source assembly is turned on, and the second light source assembly is turned off.
5. The method of claim 3, wherein the image type is a low color gamut image, the second light source assembly is turned on, and the first light source assembly is turned off.
6. The color gamut control method according to claim 1, characterized in that the first threshold is set according to a sensitivity of human eyes to color recognition.
7. The method of claim 1, wherein the first light source module has a higher average color rendering than the second light source module.
8. A display device characterized in that it executes the color gamut control method according to any one of claims 1 to 7.
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