CN112925498B - Method and device for adjusting Gamma value in screen overlapping, screen overlapping and storage medium - Google Patents
Method and device for adjusting Gamma value in screen overlapping, screen overlapping and storage medium Download PDFInfo
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- 239000002096 quantum dot Substances 0.000 claims description 9
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- 239000004973 liquid crystal related substance Substances 0.000 description 10
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
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Abstract
The invention discloses a method and a device for adjusting Gamma value in a screen stack, the screen stack and a storage medium, wherein the screen stack comprises a main screen and an auxiliary screen which are arranged in a stacked manner, and the method comprises the following steps: the main screen and the auxiliary screen are controlled to carry out Gamma correction on the single gray-scale image corresponding to each gray scale contained in the overlapped screen; the main screen and the auxiliary screen carry out Gamma correction and adopt different Gamma values, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen; collecting chromaticity values of corrected single-gray-scale images corresponding to each gray scale displayed by the screen overlapping; determining whether the color difference of the screen overlapping display is within a set color difference range according to the corresponding chromaticity value of each gray level, if so, determining Gamma values adopted by the main screen and the auxiliary screen as Gamma values used finally; if not, the Gamma values adopted by the main screen and the auxiliary screen are adjusted, and Gamma correction is carried out on the overlapped screen again until the color difference displayed by the overlapped screen is within the set color difference range.
Description
Technical Field
The present invention relates to the field of display, and in particular, to a method and apparatus for adjusting a Gamma value in a stacked screen, and a storage medium.
Background
The display contrast ratio can be greatly improved by adopting a double liquid crystal display image for the screen overlapping, wherein the lower screen is a black-and-white display screen (Sub-screen) which is used for controlling backlight at the pixel level and is equivalent to realizing local dimming at the pixel level, and the upper screen (main cell) is used for displaying a color image.
In some high-end display applications, such as broadcast (television) specific displays, medical professional displays, etc., accurate color reproduction display of each gray-scale color is required. The lcd usually needs to correct the data of the image to be displayed with a gamma curve before displaying the image, so as to ensure the brightness of the image, however, the driving characteristics of the lcd determine that the color saturation of the lcd is insufficient at low gray scale, and the color gamut expression is severely reduced. The same problem exists because the screen is also a liquid crystal screen.
Disclosure of Invention
The invention provides a method and a device for adjusting Gamma value in a stacked screen, the stacked screen and a storage medium, which are used for solving the technical problems in the prior art.
In order to solve the above technical problems, a method for adjusting a Gamma value in a stacked screen according to an embodiment of the present invention includes a main screen and a sub-screen that are stacked, where the method includes the following steps:
controlling the main screen and the auxiliary screen to carry out Gamma correction on the single gray-scale image corresponding to each gray scale contained in the overlapped screen; the main screen and the auxiliary screen carry out Gamma correction to obtain different Gamma values, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
collecting the chromaticity value of the corrected single-gray-scale image corresponding to each gray scale displayed by the screen stack;
determining whether the color difference displayed by the screen overlapping is within a set color difference range according to the corresponding chromaticity value of each gray level, if so, determining Gamma values adopted by the main screen and the auxiliary screen as Gamma values which are finally used; and if the color difference displayed by the screen overlapping is not in the set color difference range, adjusting Gamma values adopted by the main screen and the auxiliary screen, and carrying out Gamma correction on the single gray-scale image corresponding to each gray scale contained by the screen overlapping again until the color difference displayed by the screen overlapping is in the set color difference range.
In one possible implementation manner, the controlling the primary screen and the secondary screen to perform Gamma correction on the single gray-scale image corresponding to each gray-scale included in the stacked screen includes:
controlling the main screen to perform Gamma correction on the single gray level image by adopting a first Gamma value;
meanwhile, the auxiliary screen is controlled to carry out Gamma correction on the single gray level image by adopting a second Gamma value; the first Gamma value is larger than the second Gamma value, and the sum of the first Gamma value and the second Gamma value is the standard Gamma value.
In one possible implementation manner, determining whether the color difference displayed by the screen overlapping is within a set color difference range according to the chromaticity value corresponding to each gray level includes:
drawing chromaticity values corresponding to all gray scales into a gray scale change curve chart of the overlapped screen;
determining an inflection point gray scale value corresponding to the inflection point of the chromaticity value jump from the gray scale change curve graph;
judging whether the gray scale value of the inflection point is larger than a preset gray scale value; the preset gray scale value is the maximum gray scale value corresponding to the maximum color difference value of the set color difference range;
and if the gray scale value of the inflection point is smaller than the preset gray scale value, determining that the color difference of the screen overlapping display is in the set range.
In one possible implementation manner, after determining whether the inflection point gray scale value is greater than a preset gray scale value, the method further includes:
if the inflection point gray scale value is larger than or equal to the preset gray scale value, determining that the color difference of the screen overlapping display is not in the set range;
and adjusting the first Gamma value and the second Gamma value until the gray scale value of the inflection point is smaller than or equal to the preset gray scale value.
A possible implementation manner, adjusting the first Gamma value and the second Gamma value includes:
reducing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and increasing the second Gamma value by the set value to obtain an adjusted second Gamma value.
A possible implementation manner, adjusting the first Gamma value and the second Gamma value includes:
adding a set value to the first Gamma value to obtain an adjusted first Gamma value;
and reducing the second Gamma value by the set value to obtain an adjusted second Gamma value.
In one possible implementation manner, controlling the main screen to perform Gamma correction on the single gray scale image by using a first Gamma value includes:
dividing the gray level change curve from the inflection point into a low gray level stage curve and a high gray level stage curve;
controlling the main screen to perform Gamma correction on gray scales contained in the high gray stage curve by using the first Gamma value;
controlling the main screen to perform Gamma correction on the gray scale contained in the low gray scale curve by using a third Gamma value; wherein the third Gamma value is smaller than the first Gamma value.
In one possible implementation manner, controlling the secondary screen to perform Gamma correction on the single gray scale image by using a second Gamma value includes:
controlling the auxiliary screen to carry out Gamma correction on gray scales contained in the high gray stage curve by using the second Gamma value;
controlling the auxiliary screen to perform Gamma correction on gray scales contained in the low gray scale curve by using a fourth Gamma value; the fourth Gamma value is the difference between the standard Gamma value and the third Gamma value.
In a second aspect, an embodiment of the present invention provides a screen stack, where the screen stack includes a primary screen and a secondary screen that are stacked, and the screen stack uses the method described in the first aspect to adjust a Gamma value.
In one possible implementation manner, when the quantum dot film is adopted in the stacked screen for image display, the stacked screen further comprises:
and the automatic chromaticity control circuit is used for automatically controlling chromaticity of the image displayed by the screen overlapping.
In a third aspect, an embodiment of the present invention provides a device for adjusting a Gamma value in a stacked screen, where the stacked screen includes a primary screen and a secondary screen that are stacked, and the device includes:
the correction unit is used for controlling the main screen and the auxiliary screen to carry out Gamma correction on the single gray-scale image corresponding to each gray scale contained in the overlapped screen; the main screen and the auxiliary screen carry out Gamma correction to obtain different Gamma values, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
the acquisition unit is used for acquiring the chromaticity value of the corrected single-gray-scale image corresponding to each gray scale displayed by the screen overlapping;
the determining unit is used for determining whether the color difference displayed by the screen overlapping is in a set color difference range according to the chromaticity value corresponding to each gray level, if so, the Gamma values adopted by the main screen and the auxiliary screen are determined to be Gamma values which are finally used; and if the color difference displayed by the screen overlapping is not in the set color difference range, adjusting Gamma values adopted by the main screen and the auxiliary screen, and carrying out Gamma correction on the single gray-scale image corresponding to each gray scale contained by the screen overlapping again until the color difference displayed by the screen overlapping is in the set color difference range.
In one possible embodiment, the correction unit is specifically configured to:
controlling the main screen to perform Gamma correction on the single gray level image by adopting a first Gamma value;
meanwhile, the auxiliary screen is controlled to carry out Gamma correction on the single gray level image by adopting a second Gamma value; the first Gamma value is larger than the second Gamma value, and the sum of the first Gamma value and the second Gamma value is the standard Gamma value.
In a possible embodiment, the determining unit is further configured to:
drawing chromaticity values corresponding to all gray scales into a gray scale change curve chart of the overlapped screen;
determining an inflection point gray scale value corresponding to the inflection point of the chromaticity value jump from the gray scale change curve graph;
judging whether the gray scale value of the inflection point is larger than a preset gray scale value; the preset gray scale value is the maximum gray scale value corresponding to the maximum color difference value of the set color difference range;
and if the gray scale value of the inflection point is smaller than the preset gray scale value, determining that the color difference of the screen overlapping display is in the set range.
In a possible embodiment, the determining unit is further configured to:
if the inflection point gray scale value is larger than or equal to the preset gray scale value, determining that the color difference of the screen overlapping display is not in the set range;
and adjusting the first Gamma value and the second Gamma value until the gray scale value of the inflection point is smaller than or equal to the preset gray scale value.
In a possible embodiment, the determining unit is further configured to:
reducing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and increasing the second Gamma value by the set value to obtain an adjusted second Gamma value.
In a possible embodiment, the determining unit is further configured to:
adding a set value to the first Gamma value to obtain an adjusted first Gamma value;
and reducing the second Gamma value by the set value to obtain an adjusted second Gamma value.
In a possible embodiment, the correction unit is further configured to:
dividing the gray level change curve from the inflection point into a low gray level stage curve and a high gray level stage curve;
controlling the main screen to perform Gamma correction on gray scales contained in the high gray stage curve by using the first Gamma value;
controlling the main screen to perform Gamma correction on the gray scale contained in the low gray scale curve by using a third Gamma value; wherein the third Gamma value is smaller than the first Gamma value.
In a possible embodiment, the correction unit is further configured to:
controlling the auxiliary screen to carry out Gamma correction on gray scales contained in the high gray stage curve by using the second Gamma value;
controlling the auxiliary screen to perform Gamma correction on gray scales contained in the low gray scale curve by using a fourth Gamma value; the fourth Gamma value is the difference between the standard Gamma value and the third Gamma value.
In a fourth aspect, an embodiment of the present invention further provides a device for adjusting a Gamma value in a stacked screen, including:
at least one processor, and
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor performing the method of the first aspect described above by executing the instructions stored by the memory.
In a fourth aspect, an embodiment of the present invention further provides a readable storage medium, including:
the memory device is used for storing the data,
the memory is configured to store instructions that, when executed by the processor, cause an apparatus comprising the readable storage medium to perform the method as described in the first aspect above.
Drawings
FIG. 1 is a schematic representation of color gamut expression for a liquid crystal display in XYZ color space;
FIG. 2 is a flowchart of a method for adjusting Gamma values in a stacked screen according to an embodiment of the present invention;
FIG. 3 is a graph of gray scale variation before Gamma correction for a screen stack according to an embodiment of the present invention;
FIG. 4 is a graph of gray scale variation after Gamma correction using Gamma values determined by a Gamma value adjustment method according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of inflection points in a Gamma corrected gray scale curve according to an embodiment of the present invention;
FIG. 6 is a schematic sectional view of a gray level variation curve according to an embodiment of the present invention;
FIG. 7 is a graph of gray scale variation after Gamma correction for a main screen and a sub-screen segment according to an embodiment of the present invention;
FIG. 8 is a graph of gray scale variation before ACC correction performed on a stacked screen containing a quantum dot film according to an embodiment of the present invention;
fig. 9 is a graph of gray scale variation after ACC correction performed on a screen stack including a quantum dot film according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a Gamma value adjustment device in a stacked screen according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method, a device and a storage medium for adjusting Gamma values in a stacked screen, which are used for solving the technical problems in the prior art.
Please refer to fig. 1, which is a schematic diagram illustrating a color gamut of a liquid crystal display in an XYZ color space.
The chromaticity value of a color in the XYZ color space is represented by an x-color coordinate, a y-color coordinate, and a z-luminance coordinate, for example, a color a lying on the XY plane is represented by (x 1, y1, z 1) in the XYZ color space, x1 may be referred to as an x-color component of the color a, y1 may be referred to as a y-color component of the color a, and the color a changes with the z-luminance coordinate, and the color a changes to other colors.
When the liquid crystal screen displays an image, the z brightness coordinate is represented by gray scale, the liquid crystal screen with the color depth of 8 bits comprises gray scale of 1-255 (corresponding to 256 kinds of brightness), and the liquid crystal screen with the color depth of 10 bits comprises gray scale of 1-1023 (corresponding to 1024 kinds of brightness).
Note that, in fig. 1, since a color image cannot be used, a change in color at the same luminance cannot be expressed from the color, as in fig. 1, one triangle plane (parallel to the XY plane) corresponds to the same luminance, and there is a change in color in the plane thereof in practice, but in order to express a change in luminance (the luminance corresponding to the different planes is different, the expression is different in gray scale in the gray scale map), fig. 1 mainly expresses a change in different luminance, and the influence of the change in luminance on the color is expressed by a curve (the x, y values representing the colors are the same) shown in the longitudinal direction in fig. 1.
The liquid crystal display is affected by its own driving characteristics, the color saturation is insufficient at low gray levels, the color gamut expression is severely reduced, the actual color gamut expression is shown as the color gamut expression in the XYZ color space shown on the left side in fig. 1, still taking the above color a as an example, the dotted line shown in the z direction in fig. 1 represents the color actually displayed by the color a at the corresponding gray level, the dotted line is a curve in the low gray level, and the color difference is large. In an ideal case, the color a in XYZ space as shown on the right side in fig. 1, and the dotted line shown in the z direction represents the color that the color a ideally displays at the corresponding gray level, without chromatic aberration.
In practical application, the liquid crystal screen has color difference when displaying, and the liquid crystal screen (screen overlapping) adopting the screen overlapping technology has the same problems when displaying images, is more complex, and aims to solve the problems of insufficient color and expression in the screen overlapping.
In order to better understand the above technical solutions, the following detailed description of the technical solutions of the present invention is made by using the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and the embodiments of the present invention are detailed descriptions of the technical solutions of the present invention, and not limiting the technical solutions of the present invention, and the technical features of the embodiments and the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 2, an embodiment of the present invention provides a method for adjusting a Gamma value in a stacked screen, where the stacked screen includes a main screen and a sub-screen that are stacked, and a processing procedure of the method is as follows.
Step 201: the main screen and the auxiliary screen are controlled to carry out Gamma correction on the single gray-scale image corresponding to each gray scale contained in the overlapped screen; the main screen and the auxiliary screen carry out Gamma correction and adopt different Gamma values, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
step 202: collecting chromaticity values of corrected single-gray-scale images corresponding to each gray scale displayed by the screen overlapping;
step 203: determining whether the color difference of the screen overlapping display is within a set color difference range according to the corresponding chromaticity value of each gray level, if so, determining Gamma values adopted by the main screen and the auxiliary screen as Gamma values used finally; if the color difference displayed by the screen overlapping is not in the set color difference range, the Gamma values adopted by the main screen and the auxiliary screen are adjusted, and Gamma correction is carried out again on the single gray-scale image corresponding to each gray scale contained by the screen overlapping until the color difference displayed by the screen overlapping is in the set color difference range.
In one possible implementation manner, the control of the primary screen and the secondary screen to perform Gamma correction on the single gray-scale image corresponding to each gray-scale included in the stacked screen may be implemented in the following manner:
the control main screen adopts a first Gamma value to carry out Gamma correction on the single gray scale image;
meanwhile, the control auxiliary screen adopts a second Gamma value to carry out Gamma correction on the single gray level image; the first Gamma value is larger than the second Gamma value, and the sum of the first Gamma value and the second Gamma value is the standard Gamma value.
For example, the color depth of the screen is 8 bits, that is, the gray scale is 1-255, and the display condition is that the standard Gamma value corresponding to the screen is 2.3.
And the main screen and the auxiliary screen simultaneously carry out Gamma correction on the single gray level images corresponding to each gray level one by one from the gray level value of 1 to 255, and the Gamma value used by the main screen is 1.5 and the Gamma value used by the auxiliary screen is 0.8 (the sum of the Gamma values of the main screen and the auxiliary screen is 2.3) during the Gamma correction.
When the monochrome gray-scale image P1 with the gray-scale value of 1 is displayed, the first Gamma value (1.5) determined by the main screen is used for carrying out Gamma correction and display on the monochrome gray-scale image P1 (the monochrome gray-scale image corresponding to the gray-scale value of 1 is marked as P1, the monochrome gray-scale image corresponding to the gray-scale value of 2 is marked as P2, the monochrome gray-scale images of other levels and so on), and meanwhile, the second Gamma value (0.8) determined by the auxiliary screen is used for carrying out Gamma correction and display on the monochrome gray-scale image P1. And then collecting a chromaticity value C1 corresponding to the corrected monochromatic gray-scale image P1 displayed by the screen overlapping.
And then displaying the single-color gray-scale image P2 with the gray-scale value of 2, and correcting and displaying the single-color gray-scale image P2 by using a first Gamma value (1.5) determined by the main screen, and correcting and displaying the single-color gray-scale image P2 by using a second Gamma value (0.8) determined by the auxiliary screen. And then collecting a chromaticity value C2 corresponding to the corrected monochromatic gray-scale image P2 displayed by the screen overlapping.
And repeating the steps until the chromaticity value C255 corresponding to the monochrome gray-scale image P255 with the gray-scale value of 255 is acquired.
And determining whether the color difference displayed by the screen overlapping is within a set range according to the corresponding chromaticity value of each gray level, if the standard chromaticity value corresponding to the monochromatic gray level image P1 with the gray level value of 1 is a, and if the standard chromaticity value corresponding to the collected chromaticity value is C1, calculating the color difference delta E1 of the a and the C1 by utilizing a color difference calculation formula, and judging whether the delta E1 is within the color difference range. If the color differences corresponding to all gray scales are within the set range, the color differences of the stacked screen are within the set range, and the first Gamma value (1.5) and the second Gamma value (0.8) adopted by the main screen and the auxiliary screen can be determined as the Gamma value finally used by the main screen and the auxiliary screen in the stacked screen. If one or a preset number (such as 6) of chromatic aberration corresponding to the monochromatic gray-scale images is not in the chromatic aberration range, the chromatic aberration of the screen overlapping display is not in the set chromatic aberration range, the Gamma values adopted by the main screen and the auxiliary screen are adjusted, and Gamma correction is carried out on the single gray-scale image corresponding to each gray-scale image contained in the screen overlapping by using the Gamma values respectively adjusted by the main screen and the auxiliary screen until the chromatic aberration of the screen overlapping display is in the set chromatic aberration range.
Referring to fig. 3 and fig. 4, fig. 3 is a graph of gray scale variation before Gamma correction for a stacked screen according to an embodiment of the present invention, and fig. 4 is a graph of gray scale variation after Gamma correction for a Gamma value determined by a Gamma value adjustment method according to an embodiment of the present invention.
In fig. 3 and 4, the horizontal axis represents gray scale (Z-axis coordinate in XYZ color space), the vertical axis represents chromaticity coordinate of X-axis in XYZ color space or Y-chromaticity coordinate in XYZ color space, and fig. 3 and 4 are both chromaticity values corresponding to R (red) in RGB system as a function of gray scale value in XYZ color space.
When the display screen displays, the chromatic aberration of the high gray level is very small, and the chromatic aberration is large, and the chromatic aberration is in the low gray level, so in the above embodiment, the processing can be performed only on the low gray level (such as 1-60) included in the screen stack, and the workload can be saved.
In the embodiment provided by the invention, the color difference of the overlapped screen can be controlled in the set color difference range by the processing mode, and the color difference of the overlapped screen is reduced, so that the low gray-scale color saturation is improved, the color gamut of the overlapped screen is further improved, and the image displayed by the overlapped screen is more vivid.
In addition to the above-described method for determining whether the color difference of the screen-overlapping display is within the set range, the method for determining whether the color difference of the screen-overlapping display is within the set color difference range according to the chromaticity value corresponding to each gray level may also be implemented in the following manner:
drawing chromaticity values corresponding to all gray scales into a gray scale change curve chart of a stacked screen; determining an inflection point gray scale value corresponding to an inflection point of the chromaticity value jump from the gray scale change curve graph; judging whether the gray scale value of the inflection point is larger than a preset gray scale value; the preset gray scale value is a maximum gray scale value corresponding to a maximum color difference value of the set color difference range; if the gray scale value of the inflection point is smaller than the preset gray scale value, the color difference of the screen overlapping display is determined to be in a set range.
For example, please refer to fig. 5, which is a schematic diagram illustrating inflection points in a Gamma corrected gray scale curve according to an embodiment of the present invention. Fig. 5 shows an inflection point on the basis of fig. 4. The color value jump may refer to a difference between color values corresponding to two (or more) adjacent gray levels in the same coordinate system, or a difference between values of the same color component (e.g., red) corresponding to two (or more) adjacent gray levels, which is illustrated in fig. 5 for convenience of observation. The difference between the same color component (such as red) corresponding to the adjacent two-stage gray scales is used for illustration, and among the difference between the chromaticity values corresponding to all the adjacent two-stage gray scales calculated from the low gray scale to the high gray scale, the difference between the adjacent two-stage gray scales, of which the difference between the first adjacent two-stage gray scales is smaller than the red component jump threshold value (the value is a preset value), is searched, and the low gray scale and the red component value thereof in the corresponding adjacent two-stage gray scales in the difference are used as the inflection point of chromaticity jump under the red component.
Of course, other methods may be used to determine the inflection point, such as calculating a fitting function of the gray scale variation curve, deriving the fitting function, determining the gray scale corresponding to the inflection point, or using an image processing method to find the inflection point in the gray scale variation curve, and determining the corresponding gray scale value.
Assuming that the color difference Δe <2 of the screen display is desired by the user, in the coordinate system and the color component shown in fig. 5, when Δe=2, the corresponding gray-scale value is 27, and the preset gray-scale value=27. Therefore, after the gray level change curve graph (shown in fig. 4) obtained after Gamma correction is drawn on the screen stack, only the inflection point (shown in fig. 5) of the jump of the chromaticity value is found from the gray level change curve graph to obtain the gray level value corresponding to the inflection point (namely, the inflection point gray level value), and whether the color difference of the screen stack display is within the set range can be determined by judging whether the inflection point gray level value is smaller than the preset gray level value.
If the gray scale value of the inflection point is larger than or equal to the preset gray scale value, determining that the color difference of the screen overlapping display is not in the set range; and adjusting the first Gamma value and the second Gamma value until the gray scale value of the inflection point is smaller than or equal to the preset gray scale value.
For example, if it is determined that the color difference of the current display of the stacked screen is not within the set range according to the inflection point determined in fig. 5, the first Gamma value and the second Gamma value need to be adjusted, the processing procedures of steps 201 to 203 are executed again by using the adjusted first Gamma value and second Gamma value, after the processing, the color difference of the current display of the stacked screen is determined to be within the set range, and then the adjusted first Gamma value and second Gamma value are respectively used as the Gamma values of the main screen and the auxiliary screen in the stacked screen. If the color difference of the screen-overlapping display is still determined to be not in the set range after the adjustment, the Gamma value used last time is continuously adjusted until the color difference of the screen-overlapping display is in the set range.
The adjustment of the first Gamma value and the second Gamma value may be implemented in the following two ways:
the first way is: adding a set value to the first Gamma value to obtain an adjusted first Gamma value; and reducing the second Gamma value by a set value to obtain an adjusted second Gamma value.
For example, when the standard Gamma value of the screen stack is 2.3 and the first Gamma correction is performed for the first time, the first Gamma value used by the main screen is 1.5, the second Gamma value used by the auxiliary screen is 0.8, but the first Gamma value and the second Gamma value are adjusted if the color difference of the screen stack display obtained after the first Gamma correction is not within the set range, if the set value is 0.1, the first Gamma value used by the main screen is 1.4 and the second Gamma value used by the auxiliary screen is 0.9 when the Gamma correction is performed for the second time, the result obtained after the second Gamma correction is that the color difference of the screen stack display is within the set range, the first Gamma value finally used by the screen stack is determined to be 1.4, and the second Gamma value is determined to be 0.9 and stored in the screen stack.
The second way is: adding a set value to the first Gamma value to obtain an adjusted first Gamma value; and reducing the second Gamma value by a set value to obtain an adjusted second Gamma value.
For example, when the standard Gamma value of the screen stack is 2.3 and the first Gamma correction is performed for the first time, the first Gamma value used by the main screen is 1.5, the second Gamma value used by the auxiliary screen is 0.8, but the first Gamma value and the second Gamma value are adjusted if the color difference of the screen stack display obtained after the first Gamma correction is not within the set range, if the set value is 0.1, the first Gamma value used by the main screen is 1.6 and the second Gamma value used by the auxiliary screen is 0.7 when the second Gamma correction is performed for the second time, the result obtained after the second Gamma correction is that the color difference of the screen stack display is within the set range, the first Gamma value finally used by the screen stack is determined to be 1.6, and the second Gamma value is determined to be 0.7 and stored in the screen stack.
Besides the above-mentioned direct use first Gamma value and second Gamma value as main screen and auxiliary screen in the screen stack and carry on Gamma correction and use, main screen and auxiliary screen can also utilize inflection point as demarcation point and let before the inflection point and gray scale after the inflection point use different Gamma value to correct, the concrete processing mode is as follows:
gamma correction of the main screen: dividing a gray level change curve into a low gray level curve and a high gray level curve from an inflection point; the main screen is controlled to carry out Gamma correction on gray scales contained in the high gray phase curve by using a first Gamma value; controlling the main screen to perform Gamma correction on gray scales contained in the low gray scale curve by using a third Gamma value; wherein the third Gamma value is smaller than the first Gamma value.
Gamma correction of the secondary screen: the secondary screen is controlled to carry out Gamma correction on gray scales contained in the high gray stage curve by using a second Gamma value; the auxiliary screen is controlled to carry out Gamma correction on gray scales contained in the low gray scale curve by using a fourth Gamma value; the fourth Gamma value is the difference between the standard Gamma value and the third Gamma value.
Fig. 6 is a schematic sectional view of a gray level change curve according to an embodiment of the present invention. In fig. 6, the portions of the gray scale change curves corresponding to the low gray scale stages (0 to 18) are low gray scale stage curves, the portions of the gray scale change curves corresponding to the high gray scale stages (19 to 255) are low gray scale stage curves, and the inflection points are defined as boundary points. After determining the first Gamma value of the main screen for final use in the above manner, a third Gamma value smaller than the first Gamma value may be set for the low-gray-level curve, so as to set the main screen as: and when Gamma correction is carried out, using the third Gamma value to carry out Gamma correction on the gray scale included in the low gray level curve, and using the first Gamma value to carry out Gamma correction on the gray scale included in the high gray level curve.
Correspondingly, the secondary screen uses a fourth Gamma value when carrying out Gamma correction on the gray scale included in the low gray level curve, and the fourth Gamma value is the difference value between the standard Gamma value and the third Gamma value, so the primary screen is set as follows: and when Gamma correction is carried out, the fourth Gamma value is used for carrying out Gamma correction on the gray scales included in the low gray level curve, and the second Gamma value is used for carrying out Gamma correction on the gray scales included in the high gray level curve.
Fig. 7 is a graph of gray scale variation after Gamma correction of the main screen and the sub-screen segments according to the embodiment of the present invention. It can be seen from the figure that, after the main screen and the auxiliary screen correct the low gray level curve and the high gray level curve by adopting different Gamma values, the inflection point in the gray level change curve moves towards the low gray level direction, so that the color gamut of the low gray level is improved on the premise that the standard Gamma value is met in the stacked screen, and the display color difference is reduced.
After determining a first Gamma value and a second Gamma value which are finally used by the main screen and the auxiliary screen respectively in the screen stack, or the first Gamma value and the third Gamma value, the second Gamma value and the fourth Gamma value, the Gamma values can be stored in the screen stack for use in operation according to actual requirements of the screen stack, or corresponding Gamma correction tables can be generated according to the Gamma values, so that the screen stack can control the main screen and the screen stack to inquire corrected values according to the respective Gamma correction tables in operation, and corrected images can be displayed.
Based on the same inventive concept, an embodiment of the present invention provides a screen stack, where the screen stack includes a main screen and an auxiliary screen that are stacked, and the screen stack adjusts a Gamma value by using the method described above.
In one possible implementation manner, when the quantum dot film is adopted in the stacked screen for image display, the stacked screen further comprises:
and the automatic chromaticity control circuit is used for automatically controlling chromaticity of the image displayed by the screen overlapping.
Fig. 8 is a graph of gray scale change before ACC correction performed on a stacked screen with a quantum dot film according to an embodiment of the present invention, and fig. 9 is a graph of gray scale change after ACC correction performed on a stacked screen with a quantum dot film according to an embodiment of the present invention. The color gamut of the screen-stacked display can be improved by using the quantum dot film in the screen-stacked display, and as can be seen from fig. 8, the problem that the color component changes severely (such as the part shown in the elliptic curve in fig. 8) can also occur at the same time, in order to overcome the problem, an automatic chromaticity control (Automatic Chroma Control, ACC) circuit can be arranged in the screen-stacked or the T-CON (logic board) of the screen-stacked display, the ACC is corrected (i.e. chromaticity automatic control is performed), and the gray-scale change curve is obtained after correction, as shown in fig. 9, and the color component does not change severely.
By arranging the automatic chromaticity control circuit in the stacked screen containing the quantum dot film, the color component can be prevented from being changed drastically, and the display effect of the stacked screen is improved.
Based on the same inventive concept, in an embodiment of the present invention, a device for adjusting a Gamma value in a stacked screen is provided, where the stacked screen includes a main screen and a sub-screen that are stacked, and a specific implementation manner of the Gamma value adjustment used in the stacked screen may refer to a description of an embodiment portion of a method, and details are not repeated, and please refer to fig. 10, where the device includes:
a correction unit 1001, configured to control the main screen and the auxiliary screen to perform Gamma correction on a single gray-scale image corresponding to each gray-scale included in the stacked screen; the main screen and the auxiliary screen carry out Gamma correction to obtain different Gamma values, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
the collecting unit 1002 is configured to collect a chromaticity value of the corrected single-gray-scale image corresponding to each gray scale displayed by the screen stack;
a determining unit 1003, configured to determine whether a color difference displayed by the screen overlapping is within a set color difference range according to a chromaticity value corresponding to each gray level, and if so, determine Gamma values adopted by the main screen and the auxiliary screen as a Gamma value used finally; and if the color difference displayed by the screen overlapping is not in the set color difference range, adjusting Gamma values adopted by the main screen and the auxiliary screen, and carrying out Gamma correction on the single gray-scale image corresponding to each gray scale contained by the screen overlapping again until the color difference displayed by the screen overlapping is in the set color difference range.
In one possible implementation, the correction unit 1001 is specifically configured to:
controlling the main screen to perform Gamma correction on the single gray level image by adopting a first Gamma value;
meanwhile, the auxiliary screen is controlled to carry out Gamma correction on the single gray level image by adopting a second Gamma value; the first Gamma value is larger than the second Gamma value, and the sum of the first Gamma value and the second Gamma value is the standard Gamma value.
In a possible implementation manner, the determining unit 1003 is further configured to:
drawing chromaticity values corresponding to all gray scales into a gray scale change curve chart of the overlapped screen;
determining an inflection point gray scale value corresponding to the inflection point of the chromaticity value jump from the gray scale change curve graph;
judging whether the gray scale value of the inflection point is larger than a preset gray scale value; the preset gray scale value is the maximum gray scale value corresponding to the maximum color difference value of the set color difference range;
and if the gray scale value of the inflection point is smaller than the preset gray scale value, determining that the color difference of the screen overlapping display is in the set range.
In a possible implementation manner, the determining unit 1003 is further configured to:
if the inflection point gray scale value is larger than or equal to the preset gray scale value, determining that the color difference of the screen overlapping display is not in the set range;
and adjusting the first Gamma value and the second Gamma value until the gray scale value of the inflection point is smaller than or equal to the preset gray scale value.
In a possible implementation manner, the determining unit 1003 is further configured to:
reducing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and increasing the second Gamma value by the set value to obtain an adjusted second Gamma value.
In a possible implementation manner, the determining unit 1003 is further configured to:
adding a set value to the first Gamma value to obtain an adjusted first Gamma value;
and reducing the second Gamma value by the set value to obtain an adjusted second Gamma value.
In a possible implementation, the correction unit 1001 is further configured to:
dividing the gray level change curve from the inflection point into a low gray level stage curve and a high gray level stage curve;
controlling the main screen to perform Gamma correction on gray scales contained in the high gray stage curve by using the first Gamma value;
controlling the main screen to perform Gamma correction on the gray scale contained in the low gray scale curve by using a third Gamma value; wherein the third Gamma value is smaller than the first Gamma value.
In a possible implementation, the correction unit 1001 is further configured to:
controlling the auxiliary screen to carry out Gamma correction on gray scales contained in the high gray stage curve by using the second Gamma value;
controlling the auxiliary screen to perform Gamma correction on gray scales contained in the low gray scale curve by using a fourth Gamma value; the fourth Gamma value is the difference between the standard Gamma value and the third Gamma value.
Based on the same inventive concept, the embodiment of the invention provides a device for adjusting Gamma value in a stacked screen, which comprises: at least one processor, and
a memory coupled to the at least one processor;
the memory stores instructions executable by the at least one processor, and the at least one processor executes the Gamma value adjusting method by executing the instructions stored in the memory.
Based on the same inventive concept, an embodiment of the present invention also provides a readable storage medium, including:
the memory device is used for storing the data,
the memory is configured to store instructions that, when executed by the processor, cause an apparatus comprising the readable storage medium to perform the Gamma value adjustment method as described above.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the invention may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (13)
1. A method for adjusting Gamma value in a stacked screen, wherein the stacked screen comprises a main screen and a secondary screen which are stacked, and the method is characterized by comprising the following steps:
controlling the main screen and the auxiliary screen to carry out Gamma correction on the single gray-scale image corresponding to each gray scale contained in the overlapped screen; the main screen and the auxiliary screen carry out Gamma correction to obtain different Gamma values, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
collecting the chromaticity value of the corrected single-gray-scale image corresponding to each gray scale displayed by the screen stack;
determining whether the color difference displayed by the screen overlapping is within a set color difference range according to the corresponding chromaticity value of each gray level, if so, determining Gamma values adopted by the main screen and the auxiliary screen as Gamma values which are finally used; and if the color difference displayed by the screen overlapping is not in the set color difference range, adjusting Gamma values adopted by the main screen and the auxiliary screen, and carrying out Gamma correction on the single gray-scale image corresponding to each gray scale contained by the screen overlapping again until the color difference displayed by the screen overlapping is in the set color difference range.
2. The method of claim 1, wherein controlling the primary screen and the secondary screen to perform Gamma correction on the single gray-scale image corresponding to each gray-scale included in the stacked screen comprises:
controlling the main screen to perform Gamma correction on the single gray level image by adopting a first Gamma value;
meanwhile, the auxiliary screen is controlled to carry out Gamma correction on the single gray level image by adopting a second Gamma value; the first Gamma value is larger than the second Gamma value, and the sum of the first Gamma value and the second Gamma value is the standard Gamma value.
3. The method of claim 2, wherein determining whether the color difference of the overlay display is within a set color difference range based on the chromaticity value corresponding to each gray level comprises:
drawing chromaticity values corresponding to all gray scales into a gray scale change curve chart of the overlapped screen;
determining an inflection point gray scale value corresponding to the inflection point of the chromaticity value jump from the gray scale change curve graph;
judging whether the gray scale value of the inflection point is larger than a preset gray scale value; the preset gray scale value is the maximum gray scale value corresponding to the maximum color difference value of the set color difference range;
and if the gray scale value of the inflection point is smaller than the preset gray scale value, determining that the color difference displayed by the screen overlapping is within the set color difference range.
4. The method of claim 3, wherein after determining whether the inflection point gray scale value is greater than a preset gray scale value, further comprising:
if the inflection point gray scale value is larger than or equal to the preset gray scale value, determining that the color difference displayed by the screen overlapping is not in the set color difference range;
and adjusting the first Gamma value and the second Gamma value until the gray scale value of the inflection point is smaller than or equal to the preset gray scale value.
5. The method of claim 4, wherein adjusting the first Gamma value and the second Gamma value comprises:
reducing the first Gamma value by a set value to obtain an adjusted first Gamma value;
and increasing the second Gamma value by the set value to obtain an adjusted second Gamma value.
6. The method of claim 4, wherein adjusting the first Gamma value and the second Gamma value comprises:
adding a set value to the first Gamma value to obtain an adjusted first Gamma value;
and reducing the second Gamma value by the set value to obtain an adjusted second Gamma value.
7. The method of any of claims 3-6, wherein controlling the primary screen to Gamma correct the single gray scale image with a first Gamma value comprises:
dividing the gray level change curve from the inflection point into a low gray level stage curve and a high gray level stage curve;
controlling the main screen to perform Gamma correction on gray scales contained in the high gray stage curve by using the first Gamma value;
controlling the main screen to perform Gamma correction on the gray scale contained in the low gray scale curve by using a third Gamma value; wherein the third Gamma value is smaller than the first Gamma value.
8. The method of claim 7, wherein controlling the secondary screen to Gamma correct the single gray scale image with a second Gamma value comprises:
controlling the auxiliary screen to carry out Gamma correction on gray scales contained in the high gray stage curve by using the second Gamma value;
controlling the auxiliary screen to perform Gamma correction on gray scales contained in the low gray scale curve by using a fourth Gamma value; the fourth Gamma value is the difference between the standard Gamma value and the third Gamma value.
9. A screen stack comprising a primary screen and a secondary screen arranged in a stacked configuration, wherein the screen stack is configured to adjust a Gamma value using the method of any one of claims 1-8.
10. The screen pack of claim 9, wherein when the screen pack employs a quantum dot film for image display, the screen pack further comprises:
and the automatic chromaticity control circuit is used for automatically controlling chromaticity of the image displayed by the screen overlapping.
11. The utility model provides a device of Gamma value adjustment in folding screen, fold the screen and include the main screen and the auxiliary screen of range upon range of setting, its characterized in that includes:
the correction unit is used for controlling the main screen and the auxiliary screen to carry out Gamma correction on the single gray-scale image corresponding to each gray scale contained in the overlapped screen; the main screen and the auxiliary screen carry out Gamma correction to obtain different Gamma values, and the sum of the Gamma values adopted by the main screen and the auxiliary screen is a standard Gamma value corresponding to the overlapped screen;
the acquisition unit is used for acquiring the chromaticity value of the corrected single-gray-scale image corresponding to each gray scale displayed by the screen overlapping;
the determining unit is used for determining whether the color difference displayed by the screen overlapping is in a set color difference range according to the chromaticity value corresponding to each gray level, if so, the Gamma values adopted by the main screen and the auxiliary screen are determined to be Gamma values which are finally used; and if the color difference displayed by the screen overlapping is not in the set color difference range, adjusting Gamma values adopted by the main screen and the auxiliary screen, and carrying out Gamma correction on the single gray-scale image corresponding to each gray scale contained by the screen overlapping again until the color difference displayed by the screen overlapping is in the set color difference range.
12. The device for adjusting the Gamma value in the stacked screen is characterized by comprising:
at least one processor, and
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor performing the method of any of claims 1-8 by executing the instructions stored by the memory.
13. A readable storage medium comprising a memory,
the memory is configured to store instructions that, when executed by a processor, cause an apparatus comprising the readable storage medium to perform the method of any of claims 1-8.
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| CN114120875A (en) * | 2021-11-26 | 2022-03-01 | 福州京东方光电科技有限公司 | Brightness adjusting method and device of stacked screen display equipment and stacked screen display equipment |
| CN117597725A (en) * | 2022-06-09 | 2024-02-23 | 北京小米移动软件有限公司 | Display control method and device, display equipment and storage medium |
| CN115953982A (en) * | 2023-03-03 | 2023-04-11 | 北京数字光芯集成电路设计有限公司 | Gamma correction method and circuit for micro display chip |
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