CN112767867A - Display panel and brightness compensation method and device thereof - Google Patents
Display panel and brightness compensation method and device thereof Download PDFInfo
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Abstract
The embodiment of the invention discloses a display panel and a brightness compensation method and a brightness compensation device thereof, wherein the target refresh frequency of the next frame of the display panel is obtained; judging whether the target refreshing frequency is equal to the reference refreshing frequency or not, and determining target brightness compensation data according to preset compensation data and difference compensation data corresponding to the target refreshing frequency when the target refreshing frequency is not equal to the reference refreshing frequency; and compensating the display panel according to the target brightness compensation data. According to the technical scheme, when the target refreshing frequency is unequal to the reference refreshing frequency, the target brightness compensation data is obtained according to the preset compensation data corresponding to the reference refreshing frequency and the difference compensation data corresponding to the target refreshing frequency, and then the display panel can be compensated according to the gray scale of the phase difference of the display panel under different refreshing frequencies, so that the brightness mutation caused by the change of the refreshing frequency is reduced, and the screen flashing phenomenon is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a brightness compensation method and device thereof.
Background
With the development of display technology, the requirements of users on use experience gradually increase.
In order to improve the experience of users, the refresh frequency of the existing display panel is different in different application scenes.
However, the conventional display panel has the problem of screen flashing caused by sudden brightness change when different refreshing frequencies are switched.
Disclosure of Invention
The invention provides a display panel and a brightness compensation method and device thereof, which aim to reduce the sudden change of brightness under different refreshing frequencies and reduce the problem of screen flashing.
In a first aspect, an embodiment of the present invention provides a method for compensating brightness of a display panel, including:
acquiring the target refreshing frequency of the next frame of the display panel;
judging whether the target refreshing frequency is equal to the reference refreshing frequency or not, and determining preset compensation data corresponding to the reference refreshing frequency as target brightness compensation data when the target refreshing frequency is equal to the reference refreshing frequency; when the target refreshing frequency is not equal to the reference refreshing frequency, determining target brightness compensation data according to preset compensation data and difference compensation data corresponding to the target refreshing frequency; the difference compensation data is the difference value between the corresponding conversion gray scale and the corresponding binding point gray scale of each binding point gray scale at the reference refreshing frequency at the target refreshing frequency;
and compensating the display panel according to the target brightness compensation data.
Optionally, when it is determined whether the target refresh frequency is equal to the reference refresh frequency, determining preset compensation data corresponding to the reference refresh frequency as target brightness compensation data; when the target refresh frequency is not equal to the reference refresh frequency, before determining the target brightness compensation data according to the preset compensation data and the difference compensation data corresponding to the target refresh frequency, the method further includes:
determining conversion gray scales respectively corresponding to the binding point gray scales under the non-reference refreshing frequency according to the optical data corresponding to the binding point gray scales under the reference refreshing frequency;
and determining difference compensation data corresponding to the non-reference refresh frequency according to each conversion gray scale and the corresponding binding point gray scale under the non-reference refresh frequency.
Optionally, determining, according to the optical data corresponding to each binding point gray scale at the reference refresh frequency, a conversion gray scale corresponding to each binding point gray scale at the non-reference refresh frequency, includes:
determining the average value of the optical data corresponding to the binding point gray scale of the set color sub-pixels in the display panel according to the optical data of the set color sub-pixels corresponding to the binding point gray scale under the reference refreshing frequency; setting the color sub-pixel as any color sub-pixel in the display panel;
determining a conversion coefficient corresponding to the set color sub-pixel according to the binding gray scale, the maximum gray scale and an average value of optical data corresponding to the set color sub-pixel under the binding gray scale; wherein, the conversion coefficient is negatively correlated with the maximum gray scale and the average value of the optical data, and positively correlated with the binding point gray scale;
and determining the conversion gray scale of the set color sub-pixel according to the conversion coefficient and the binding point gray scale corresponding to the set color sub-pixel.
Optionally, when the target refresh frequency is not equal to the reference refresh frequency, determining the target brightness compensation data according to the preset compensation data and the difference compensation data corresponding to the target refresh frequency, where the determining the target brightness compensation data includes:
and when the target refreshing frequency is not equal to the reference refreshing frequency, determining the sum of preset gray scale compensation data corresponding to the binding gray scale in the preset compensation data and gray scale difference compensation data of the difference compensation data as target compensation data corresponding to the binding gray scale in the target brightness compensation data for any binding gray scale of any color sub-pixel.
Optionally, before determining the refresh frequency of the next frame of the display panel, the method further includes:
and determining the reference refresh frequency according to the brightness of the display panel when the display panel displays the preset display picture under different refresh frequencies.
Optionally, presetting a white picture with a display picture under the maximum gray scale;
determining a reference refresh frequency according to preset display pictures of the display panel under different refresh frequencies, wherein the preset display pictures under different refresh frequencies comprise:
and determining the refresh frequency corresponding to the preset display picture with the minimum brightness in all the refresh frequencies as the reference refresh frequency.
Optionally, in the difference compensation data, the difference gray scale compensation data corresponding to at least the maximum gray scale is less than or equal to 0.
Optionally, the preset compensation data is mura compensation data at a reference compensation frequency.
In a second aspect, an embodiment of the present invention further provides a brightness compensation apparatus for a display panel, including:
the target refreshing frequency acquisition module is used for acquiring the target refreshing frequency of the next frame of the display panel;
the target brightness compensation data determining module is used for judging whether the target refreshing frequency is equal to the reference refreshing frequency or not, and determining preset compensation data corresponding to the reference refreshing frequency as target brightness compensation data when the target refreshing frequency is equal to the reference refreshing frequency; when the target refreshing frequency is not equal to the reference refreshing frequency, determining target brightness compensation data according to preset compensation data and difference compensation data corresponding to the target refreshing frequency; the difference compensation data is the difference value between the corresponding conversion gray scale and the corresponding binding point gray scale of each binding point gray scale at the reference refreshing frequency at the target refreshing frequency;
and the compensation module is used for compensating according to the target brightness compensation data and the display panel.
In a third aspect, an embodiment of the present invention further provides a display panel, including the brightness compensation apparatus of the display panel in the second aspect.
According to the display panel and the brightness compensation method and device thereof provided by the embodiment of the invention, the target refresh frequency of the next frame of the display panel is obtained; judging whether the target refreshing frequency is equal to the reference refreshing frequency or not, and determining preset compensation data corresponding to the reference refreshing frequency as target brightness compensation data when the target refreshing frequency is equal to the reference refreshing frequency; when the target refreshing frequency is not equal to the reference refreshing frequency, determining target brightness compensation data according to preset compensation data and difference compensation data corresponding to the target refreshing frequency; compensating the display panel according to the target brightness compensation data; when the target brightness compensation data is determined, when the target refresh frequency is not equal to the reference refresh frequency, on the basis of the preset compensation data corresponding to the reference refresh frequency, the difference compensation data including the conversion gray scale corresponding to each binding point gray scale under the reference refresh frequency and the difference value between the corresponding binding point gray scale (namely the gray scale with the difference between the conversion gray scale and the corresponding binding point gray scale) is used for further compensating to obtain the target brightness compensation data corresponding to the target refresh frequency, and then the display panel can be compensated according to the gray scale with the difference between the display panel and different refresh frequencies, so that the brightness mutation caused by the change of the refresh frequency is reduced, and the phenomenon of screen flicker is improved.
Drawings
FIG. 1 is a flowchart illustrating a method for compensating brightness of a display panel according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a brightness compensation method for a display panel according to another embodiment of the present invention;
FIG. 3 is a flowchart illustrating a brightness compensation method for a display panel according to another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a luminance compensation apparatus of a display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As described in the background art, the conventional display panel has a problem of screen flashing caused by sudden brightness change when different refresh frequencies are switched. The inventor researches and finds that the problem is caused by the fact that the existing display panel comprises a plurality of display modes, such as a reading mode and a game mode, wherein the refresh frequency in different display modes is inconsistent, for example, the refresh frequency corresponding to the reading mode is low, and the refresh frequency corresponding to the game mode is high. The scanning time of each row of sub-pixels in the display panel under different refresh rates is unequal, wherein when the refresh rate is higher, the scanning time of each row of sub-pixels is relatively shorter; the scanning time for each row of sub-pixels is relatively long when the refresh frequency is low. When the scanning time of each row of sub-pixels is different, the charging and discharging time of the pixel circuit is also different, when the same data voltage is provided for the pixel circuit due to the fact that the charging and discharging time of the pixel circuit is different under the same gray scale, the magnitude of the data voltage written into the grid electrode of the driving transistor in the pixel circuit is different, the magnitude of driving current which is generated by the driving transistor under different refreshing frequencies and corresponds to the same gray scale is finally different, the luminance of the light-emitting device is related to the driving current which flows through the light-emitting device, therefore, the luminance of the same gray scale under different refreshing frequencies and corresponding to the same gray scale under different refreshing rates is different, and the luminance mutation occurs when the refreshing frequency is switched, and the flash screen occurs.
For the above reasons, embodiments of the present invention provide a brightness compensation method of a display panel, which may be performed by a brightness compensation device of the display panel, which may be integrated in a driving chip of the display panel. Fig. 1 is a flowchart of a brightness compensation method of a display panel according to an embodiment of the present invention, and referring to fig. 1, the brightness compensation method of the display panel includes:
specifically, the refresh frequency of the display panel includes at least two types according to the operation mode of the display panel, and the target refresh frequency may be one of the refresh frequencies. The target refresh rate of the next frame of the display panel can be obtained from the motherboard, and illustratively, the brightness compensation device of the display panel communicates with the motherboard to further obtain the target refresh rate of the next frame of the display panel from the motherboard.
the difference compensation data is the difference value between the corresponding conversion gray scale and the corresponding binding point gray scale of each binding point gray scale at the reference refreshing frequency at the target refreshing frequency;
specifically, the target luminance compensation data may include compensation data corresponding to each sub-pixel in the display panel under different binding gray scales, where the compensation data corresponding to different sub-pixels under the same binding gray scale may be different, and the compensation data corresponding to the same sub-pixel under different binding gray scales may also be different. In this embodiment, the compensation data may refer to gray scale values. For example, in the target luminance compensation data corresponding to the target refresh frequency, if the compensation data of a certain sub-pixel in the display panel at 32 grayscales is 3, when performing luminance compensation on the sub-pixel, 3 grayscales are added to the pre-display grayscale of the next frame of the sub-pixel, that is, the display grayscale (32 grayscales) to be displayed originally in the data provided by the main board to the luminance compensation device of the display panel, to obtain the target display grayscale (35 grayscales) of the next frame, and the data voltage corresponding to the target display grayscale (35 grayscales) is provided for the next frame.
In this step, the target brightness compensation data is determined according to the relationship between the target refresh frequency and the reference refresh frequency. The relationship between the target refresh frequency and the reference refresh frequency includes that the target refresh frequency is equal to the reference refresh frequency, and the target refresh frequency is not equal to the reference refresh frequency. The reference refresh frequency may be determined before this step 120, and the reference refresh frequency is one of the refresh frequencies that the display panel can perform. The brightness compensation data of the reference refresh frequency can be obtained by testing at the reference refresh frequency, and the brightness compensation data obtained by the testing is used as the preset compensation data.
The corresponding target brightness compensation data may be different at different refresh frequencies. In this embodiment, a set of preset target compensation data is obtained for the reference refresh frequency, and when the target refresh frequency is not equal to the reference refresh frequency, the target brightness compensation data may be determined according to the preset compensation data corresponding to the reference refresh frequency and the difference compensation data corresponding to the target refresh frequency. The difference compensation data is the difference between the corresponding conversion gray scale and the corresponding binding gray scale of each binding gray scale at the reference refresh frequency at the target refresh frequency. In the difference compensation data, the compensation data corresponding to different sub-pixels under the same binding point gray scale may be the same or different, and this embodiment is not specifically limited herein. Optionally, a corresponding relationship between the binding point gray scale at the reference refresh frequency and a conversion gray scale corresponding to the binding point gray scale at the target refresh frequency is preset, the conversion gray scale corresponding to the binding point gray scale at the reference refresh frequency at the target refresh frequency is determined according to the preset corresponding relationship, then the difference compensation data is obtained from the conversion gray scale and the binding point gray scale having the corresponding relationship, and further the target brightness compensation data of the binding point gray scale at the target refresh frequency is obtained.
As analyzed in the embodiment regarding the reason for the problem in the background art, the charging and discharging times of the pixel circuits are different at different refresh frequencies, so that when the same data voltage is provided to the same pixel circuit at different refresh frequencies, the magnitudes of the data voltages written to the driving transistors in the pixel circuits are different, and the light emitting luminance of the light emitting device is different when the same data voltage is provided to the same pixel circuit at different refresh frequencies. In order to solve the above problem, in this step, when the target refresh frequency is not equal to the reference refresh frequency, the tie point gray scale at the reference refresh frequency is converted into an actual gray scale at the target refresh frequency, that is, a conversion gray scale, for example, when the conversion is performed, a gray scale having the same luminance data as the tie point gray scale at the target refresh frequency may be determined as a conversion gray scale, the conversion gray scale and the tie point gray scale are generally not equal to each other, difference compensation data may be obtained according to a difference between each conversion gray scale and the corresponding tie point gray scale, a gray scale difference between the conversion gray scale and the corresponding tie point gray scale may be obtained, and target luminance compensation data may be obtained according to preset compensation data corresponding to the reference refresh frequency and difference compensation data corresponding to the target refresh frequency. When the target refresh frequency is not equal to the reference refresh frequency, on the basis of the preset compensation data corresponding to the reference refresh frequency, the difference compensation data including the difference value between the conversion gray scale corresponding to each binding point gray scale under the reference refresh frequency and the corresponding binding point gray scale (namely the gray scale with the difference between the conversion gray scale and the corresponding binding point gray scale) is used for further compensating to obtain the target brightness compensation data corresponding to the target refresh frequency, so that the display panel can be compensated according to the gray scale with the difference between the display panel and different refresh frequencies, further the brightness mutation caused by the change of the refresh frequency is reduced, and the screen flicker phenomenon is improved.
And step 130, compensating the display panel according to the target brightness compensation data.
Specifically, before step 130, the method may further include obtaining a pre-display gray scale of each sub-pixel in the display panel in the next frame. Optionally, the pre-display gray scale of the display panel in the next frame includes the pre-display gray scale of each sub-pixel in the display panel in the next frame. The pre-display gray scale is the gray scale which is originally required to be displayed by each sub-pixel provided by the main board in the next frame. In this step, during compensation, for each sub-pixel in the display panel, the sum of the pre-display gray scale of the sub-pixel and the corresponding target compensation data (which may be a gray scale value) in the target luminance compensation data may be determined as final gray scale data (denoted as a target display gray scale), where the corresponding target compensation data in the target luminance compensation data is the target compensation data corresponding to the tie point gray scale equal to the pre-display gray scale of the sub-pixel, and a data voltage corresponding to the target display gray scale of the sub-pixel is provided for the sub-pixel in the next frame, so as to implement luminance compensation for the display panel.
In the brightness compensation method for the display panel provided by the embodiment, the target refresh frequency of the next frame of the display panel is obtained; judging whether the target refreshing frequency is equal to the reference refreshing frequency or not, and determining preset compensation data corresponding to the reference refreshing frequency as target brightness compensation data when the target refreshing frequency is equal to the reference refreshing frequency; when the target refreshing frequency is not equal to the reference refreshing frequency, determining target brightness compensation data according to preset compensation data and difference compensation data corresponding to the target refreshing frequency; compensating the display panel according to the target brightness compensation data; when the target brightness compensation data is determined, when the target refresh frequency is not equal to the reference refresh frequency, on the basis of the preset compensation data corresponding to the reference refresh frequency, the difference compensation data including the conversion gray scale corresponding to each binding point gray scale under the reference refresh frequency and the difference value between the conversion gray scale and the corresponding binding point gray scale (namely the gray scale with the difference between the conversion gray scale and the corresponding binding point gray scale) is further compensated to obtain the target brightness compensation data corresponding to the target refresh frequency, so that the display panel can be compensated according to the gray scale with the difference between the display panel and different refresh frequencies, further the brightness mutation caused by the change of the refresh frequency is reduced, and the phenomenon of screen flicker is improved.
On the basis of the above embodiment, optionally, when the target refresh frequency is not equal to the reference refresh frequency, the sum of the preset compensation data and the difference compensation data is determined as the target luminance compensation data.
Specifically, determining the sum of the preset compensation data and the difference compensation data as the target luminance compensation data may be understood as performing compensation on the display panel twice, wherein one compensation may be considered as performing compensation on the display panel using the difference compensation data, that is, the display gray scale of the display panel at the target refresh frequency is converted to the gray scale at the reference refresh frequency, and the other compensation can be regarded as the gray scale conversion after the first compensation, namely, after the gray scale under the target refresh frequency is converted into the gray scale under the reference refresh frequency, the preset compensation data under the reference refresh frequency is adopted to compensate the display panel, compared with the prior art that the compensation is not carried out aiming at different refresh frequencies or only one group of the same compensation data is used for compensation, more accurate compensation can be provided for different refresh frequencies, and the problem of brightness abrupt change caused by refresh frequency switching is further improved.
Fig. 2 is a flowchart of another brightness compensation method for a display panel according to an embodiment of the present invention, and referring to fig. 2, optionally, the brightness compensation method for the display panel includes:
optionally, the optical data corresponding to the binding gray scale at the reference refresh frequency may be data reflecting the brightness of sub-pixels in the display panel. The binding gray scale may only include a part of display gray scale in the whole display gray scale range at the reference refresh frequency, or may include all display gray scale in the whole gray scale range at the reference refresh frequency. In this step, each tie point gray scale under the reference refresh frequency is respectively obtained from the conversion gray scale under the non-reference refresh frequency, wherein the non-reference refresh frequency is the refresh frequency except the reference refresh frequency which can be executed by the display panel. Illustratively, the display panel may perform the refresh frequency of 60Hz, 90Hz and 120Hz, and when the reference refresh frequency is 60Hz, the non-reference refresh frequency includes 90Hz and 120 Hz. In this step, the conversion gray scale corresponding to each binding point gray scale is determined according to the color difference of the sub-pixels. For example, when the display panel comprises red, green and blue sub-pixels, the conversion gray scale corresponding to each binding point gray scale is determined for the red sub-pixels; determining a conversion gray scale corresponding to each binding point gray scale for the green sub-pixel; and determining the conversion gray scale corresponding to each binding point gray scale for the blue sub-pixel.
Optionally, step 221 includes:
2211, determining an average value of optical data corresponding to the binding point gray scale of the set color sub-pixels in the display panel according to the optical data of the set color sub-pixels corresponding to the binding point gray scale at the reference refresh frequency; setting the color sub-pixel as any color sub-pixel in the display panel;
specifically, the corresponding conversion gray levels for different color sub-pixels under the same binding gray level may be different. When the conversion gray scale corresponding to the binding point gray scale is calculated, the calculation can be respectively carried out according to the different colors of the sub-pixels. For example, when acquiring optical data, only the sub-pixels of one color in the display panel may be lit up at the binding gray scale, and the sub-pixels of the other color may not be lit up. In this step, an average value of the optical data corresponding to the binding point gray scale at the reference refresh frequency may be calculated for the set color sub-pixel, and the average value may reflect an average value of the luminance of the set color sub-pixel at the binding point gray scale.
Step 2212, determining the corresponding conversion coefficients of the set color sub-pixels according to the binding gray scale, the maximum gray scale and the average value of the optical data corresponding to each set color sub-pixel under the binding gray scale; wherein, the conversion coefficient is negatively correlated with the maximum gray scale and the average value of the optical data, and positively correlated with the binding point gray scale;
optionally, the conversion coefficient is determined according to the following formula:
wherein, ratioxRepresenting conversion coefficients of the sub-pixels corresponding to the binding point gray scale, GrayN representing the binding point gray scale, GrayMAX representing the maximum gray scale, MxWhich represents the average value of the optical data corresponding to the color sub-pixels at the binding gray level. According to the formula, the conversion coefficients of the same color sub-pixels corresponding to the same binding point gray scale are the same.
In other optional embodiments of the present invention, the optical data corresponding to the maximum gray scale at each non-reference frequency may be further collected, and when the conversion coefficient corresponding to each non-reference frequency is calculated, the conversion coefficient may be calculated according to the tie point gray scale, the maximum gray scale, an average value of the optical data corresponding to each set color sub-pixel at the tie point gray scale, and an average value of the optical data corresponding to the maximum gray scale at the non-reference frequency.
Optionally, the conversion coefficient is determined according to the following formula:
wherein, ratioxRepresenting conversion coefficients of the sub-pixels corresponding to the binding point gray scale, GrayN representing the binding point gray scale, GrayMAX representing the maximum gray scale, MxMeans, M, representing the average value of the optical data corresponding to the color sub-pixels at the binding gray levelmaxThe average value of the optical data corresponding to the maximum gray level at the non-reference frequency is represented.
And 2213, determining the conversion gray scale of the set color sub-pixel according to the corresponding conversion coefficient and the binding gray scale of the set color sub-pixel.
Specifically, the conversion gray scale corresponding to the set color sub-pixel may be equal to the product of the conversion coefficient corresponding to the set color sub-pixel and the binding gray scale.
The difference compensation data may include compensation data corresponding to different color sub-pixels at different binding gray scales. For the compensation data corresponding to a color sub-pixel under a binding gray scale, the difference value between the conversion gray scale and the binding gray scale under the non-reference frequency of the binding gray scale is equal.
Specifically, the preset compensation data includes preset gray scale compensation data corresponding to different color sub-pixels under each binding point gray scale, where the preset gray scale compensation data corresponding to different color sub-pixels under the same binding point gray scale may be different. The difference compensation data comprises gray scale compensation difference data corresponding to different color sub-pixels under each binding point gray scale, wherein the gray scale difference compensation data corresponding to different color sub-pixels under the same binding point gray scale can be different. For example, for a red sub-pixel, at a certain binding gray level at the reference refresh frequency, for example, 32 gray levels, the preset gray level compensation data corresponding to the binding gray level 32 gray level in the preset compensation data is 2, the gray level compensation difference data corresponding to the binding gray level 32 gray level in the difference compensation data is-1, and the target compensation data corresponding to the binding gray level 32 gray level in the target luminance compensation data is 2+ (-1) or 1, i.e. the target compensation data corresponding to the binding gray level 32 gray level in the target luminance compensation data is 1 gray level.
And 240, compensating the display panel according to the target brightness compensation data. This step is the same as step 130 in the above embodiment, and is not described herein again.
Fig. 3 is a flowchart of another brightness compensation method for a display panel according to an embodiment of the present invention, and referring to fig. 3, optionally, the brightness compensation method for the display panel includes:
Specifically, the brightness of the display panel displaying the same preset display screen is usually different at different refresh frequencies. The preset display picture can be a single-color picture or a mixed-color picture.
Optionally, presetting a white picture with a display picture under the maximum gray scale; the step 310 may include:
and determining the refresh frequency corresponding to the preset display picture with the minimum brightness in all the refresh frequencies as the reference refresh frequency.
Specifically, the brightness of the display frame may be preset at each refresh frequency, the minimum brightness may be determined, and the refresh frequency corresponding to the minimum brightness may be the reference refresh frequency. Specifically, if the refresh frequency corresponding to the other luminance greater than the minimum luminance is determined as the reference refresh frequency, when the luminance of the maximum gray-scale white picture at the target refresh frequency is less than the luminance of the maximum gray-scale white picture at the reference refresh frequency, the gray scale at the target refresh frequency needs to be increased to compensate the maximum gray scale, and the maximum gray scale cannot be adjusted to the high gray scale any more, that is, the maximum luminance that can be displayed at the refresh frequency is reached, so that the compensation cannot be performed. In the embodiment, the refresh frequency corresponding to the preset display frame with the minimum brightness in the refresh frequencies is determined as the reference refresh frequency, so that the brightness of the white frame with the maximum gray scale at the target refresh frequency is greater than the brightness of the white frame with the maximum gray scale at the reference refresh frequency, and when brightness compensation is performed, the white frame with the maximum gray scale at the target refresh frequency is compensated to the gray scale less than the maximum gray scale, so that the situation that compensation cannot be performed cannot occur during compensation, further, the brightness compensation of the display panel can be still realized at a higher gray scale, and the brightness mutation phenomenon during refresh frequency switching is further improved.
In another optional embodiment of the present invention, the preset display frame may also be a monochrome maximum gray scale display frame; for example, when the sub-pixels of the display panel include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, the predetermined display frames may include a red maximum gray scale display frame, a green maximum gray scale display frame, and a blue maximum gray scale display frame.
Optionally, in the difference compensation data, the difference gray scale compensation data corresponding to at least the maximum gray scale is less than or equal to 0.
As analyzed above, the refresh frequency corresponding to the preset display frame with the minimum brightness among the refresh frequencies is determined as the reference refresh frequency, so that the maximum gray-scale white frame brightness at the target refresh frequency is greater than the maximum gray-scale white frame brightness at the reference refresh frequency, and when performing brightness compensation, the maximum gray-scale white frame at the target refresh frequency is compensated to the gray scale less than the maximum gray scale, so that the difference gray scale compensation data corresponding to the maximum gray scale is less than or equal to 0, and the normal brightness compensation at the maximum gray scale at the target refresh frequency can be ensured.
Step 330, determining whether the target refresh frequency is equal to the reference refresh frequency, wherein when the target refresh frequency is equal to the reference refresh frequency, the preset compensation data corresponding to the reference refresh frequency is determined as target brightness compensation data; when the target refreshing frequency is not equal to the reference refreshing frequency, determining target brightness compensation data according to preset compensation data and difference compensation data corresponding to the target refreshing frequency; this step is the same as step 120 in the above embodiments, and is not described herein again.
On the basis of the above embodiments, optionally, the preset compensation data is mura compensation data at the reference compensation frequency.
Specifically, Demura may be performed on the display panel at the reference refresh frequency, and then mura compensation data at the reference refresh frequency is obtained as the preset compensation data. The method of Demura may be any method in the prior art, and this embodiment is not particularly limited.
Fig. 4 is a schematic structural diagram of a brightness compensation apparatus for a display panel according to an embodiment of the present invention, and referring to fig. 4, the brightness compensation apparatus for a display panel includes:
a target refresh frequency determination module 410, configured to determine a target refresh frequency of a next frame of the display panel;
a target brightness compensation data determining module 420, configured to determine whether the target refresh frequency is equal to the reference refresh frequency, where when the target refresh frequency is equal to the reference refresh frequency, the preset compensation data corresponding to the reference refresh frequency is determined as the target brightness compensation data; when the target refreshing frequency is not equal to the reference refreshing frequency, determining target brightness compensation data according to preset compensation data and difference compensation data corresponding to the target refreshing frequency; the difference compensation data comprises the difference value between the corresponding conversion gray scale and the corresponding binding point gray scale of each binding point gray scale under the reference refreshing frequency under the target refreshing frequency;
and a compensation module 430 for compensating the display panel according to the target brightness compensation data.
The brightness compensation device of the display panel of the present embodiment is used to execute the brightness compensation method of the display panel according to any of the above embodiments of the present invention, and has the corresponding effects of the brightness compensation method of the display panel according to any of the above embodiments of the present invention.
Fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and referring to fig. 5, the display panel 10 includes a brightness compensation apparatus 400 of the display panel according to the embodiment. Alternatively, the display panel includes the driving chip 100, and the brightness compensation apparatus 400 of the display panel may be integrated in the driving chip 100.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for compensating brightness of a display panel, comprising:
acquiring the target refreshing frequency of the next frame of the display panel;
judging whether the target refreshing frequency is equal to a reference refreshing frequency or not, and determining preset compensation data corresponding to the reference refreshing frequency as the target brightness compensation data when the target refreshing frequency is equal to the reference refreshing frequency; when the target refresh frequency is not equal to the reference refresh frequency, determining the target brightness compensation data according to the preset compensation data and the difference compensation data corresponding to the target refresh frequency; wherein, the difference compensation data is the difference between the corresponding conversion gray scale and the corresponding binding point gray scale of each binding point gray scale under the reference refresh frequency under the target refresh frequency;
and compensating the display panel according to the target brightness compensation data.
2. The method according to claim 1, wherein when said determining whether the target refresh frequency is equal to a reference refresh frequency, wherein the target refresh frequency is equal to the reference refresh frequency, determining preset compensation data corresponding to the reference refresh frequency as the target brightness compensation data; when the target refresh frequency is not equal to the reference refresh frequency, before determining the target brightness compensation data according to the preset compensation data and the difference compensation data corresponding to the target refresh frequency, the method further includes:
determining conversion gray scales respectively corresponding to the binding point gray scales under the non-reference refreshing frequency according to the optical data corresponding to the binding point gray scales under the reference refreshing frequency;
and determining difference compensation data corresponding to the non-reference refreshing frequency according to each conversion gray scale and the binding point gray scale corresponding to the conversion gray scale under the non-reference refreshing frequency.
3. The method for compensating brightness of a display panel according to claim 2, wherein the determining the conversion gray levels corresponding to the binding gray levels at the non-reference refresh frequency according to the optical data corresponding to the binding gray levels at the reference refresh frequency comprises:
determining the average value of the optical data corresponding to the binding point gray scale of the set color sub-pixels in the display panel according to the optical data of the set color sub-pixels corresponding to the binding point gray scale under the reference refreshing frequency; the color setting sub-pixel is any color sub-pixel in the display panel;
determining a conversion coefficient corresponding to the set color sub-pixel according to a binding point gray scale, a maximum gray scale and an average value of optical data corresponding to the set color sub-pixel under the binding point gray scale, wherein the conversion coefficient is negatively correlated with the maximum gray scale and the average value of the optical data and positively correlated with the binding point gray scale;
and determining the conversion gray scale of the set color sub-pixel according to the conversion coefficient and the binding point gray scale corresponding to the set color sub-pixel.
4. The method of claim 2, wherein when the target refresh rate is not equal to the reference refresh rate, determining the target luminance compensation data according to the preset compensation data and the difference compensation data corresponding to the target refresh rate comprises:
and when the target refresh frequency is not equal to the reference refresh frequency, for any binding point gray scale of any color sub-pixel, determining the sum of preset gray scale compensation data corresponding to the binding point gray scale in the preset compensation data and gray scale difference compensation data corresponding to the difference compensation data as target compensation data corresponding to the binding point gray scale in the target brightness compensation data.
5. The method of claim 1, further comprising, before the determining a refresh frequency of a next frame of the display panel:
and determining a reference refresh frequency according to the brightness of the display panel when the display panel displays a preset display picture under different refresh frequencies.
6. The method according to claim 5, wherein the predetermined display frame is a white frame at a maximum gray scale;
the determining, according to the preset display frames of the display panel at different refresh frequencies, a reference refresh frequency according to the different refresh frequencies includes:
and determining the refresh frequency corresponding to the preset display picture with the minimum brightness in all the refresh frequencies as the reference refresh frequency.
7. The method of claim 1, wherein the difference gray scale compensation data corresponding to at least the maximum gray scale is less than or equal to 0.
8. The method of claim 1, wherein the predetermined compensation data is mura compensation data at the reference compensation frequency.
9. A luminance compensation apparatus of a display panel, comprising:
the target refreshing frequency acquisition module is used for acquiring the target refreshing frequency of the next frame of the display panel;
a target brightness compensation data determining module, configured to determine whether the target refresh frequency is equal to a reference refresh frequency, where when the target refresh frequency is equal to the reference refresh frequency, preset compensation data corresponding to the reference refresh frequency is determined as the target brightness compensation data; when the target refresh frequency is not equal to the reference refresh frequency, determining the target brightness compensation data according to the preset compensation data and the difference compensation data corresponding to the target refresh frequency; wherein, the difference compensation data is the difference between the corresponding conversion gray scale and the corresponding binding point gray scale of each binding point gray scale under the reference refresh frequency under the target refresh frequency;
and the compensation module is used for compensating the display panel according to the target brightness compensation data.
10. A display panel characterized by comprising the luminance compensation device of the display panel according to claim 9.
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