CN113035152A - Gray scale brightness adjusting method and device of display panel - Google Patents
Gray scale brightness adjusting method and device of display panel Download PDFInfo
- Publication number
- CN113035152A CN113035152A CN202110281574.0A CN202110281574A CN113035152A CN 113035152 A CN113035152 A CN 113035152A CN 202110281574 A CN202110281574 A CN 202110281574A CN 113035152 A CN113035152 A CN 113035152A
- Authority
- CN
- China
- Prior art keywords
- brightness
- current
- value
- gray scale
- target
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
Abstract
The embodiment of the invention discloses a gray scale brightness adjusting method and a device thereof of a display panel, which are characterized in that when the current display brightness value is not in the target brightness adjusting range corresponding to the target gray scale, the current gray scale brightness adjusting step value, the current cycle number and the current brightness state change number are obtained; judging whether the current brightness state change frequency is 0 or not; if not, according to Val being 1+ St/2(AdjT‑FT+1)Calculating a single-point brightness adjustment stepping value Val; st is the current gray scale brightness adjustment step value, AdjT is the current cycle number, and FT is the current brightness state change number; adding the single-point brightness adjustment stepping value Val into the current gamma register value; and repeatedly executing the steps of obtaining the brightness adjustment stepping value of the current gray scale, the current cycle number and the current brightness state change number until the current display brightness value is in the target brightness range corresponding to the target gray scale and/or the current cycle number is greater than the maximum value of the cycle number. The embodiment of the invention can quickly and accurately regulate the gamma register value.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a gray scale brightness adjusting method and device of a display panel.
Background
The gray scale divides the brightness variation between the brightest and darkest into several parts so as to control the corresponding relationship between the input signal and the display brightness. Since the brightness perceived by the human eye is not linearly related to the brightness of the actual display of the display panel. In low brightness environments, the human eye is more sensitive to changes in brightness, and in high brightness environments, the other way around. This characteristic of the human eye is called Gamma (Gamma) characteristic. Due to the non-linear perception characteristic of human eyes to the brightness, gamma adjustment needs to be carried out on the display panel in the production process of the display panel, namely, the gamma register value corresponding to the gray scale degree is adjusted, so that the display brightness presented by the display panel can be matched with the brightness perceived by the human eyes. How to adjust the gamma register value of the display panel quickly and compatibly with display panels with different characteristics becomes a technical problem to be solved urgently at present.
Disclosure of Invention
In view of the above problems, embodiments of the present invention provide a gray scale brightness adjusting method and device for a display panel, so as to improve an adjusting speed of a gamma register value, and to be compatible with display panels with different characteristic differences, thereby improving an adjusting speed and an accuracy of the gamma register value of the display panel.
In a first aspect, an embodiment of the present invention provides a gray scale brightness adjustment method for a display panel, including:
when the current display brightness value is not in the target brightness adjustment range corresponding to the target gray scale, acquiring a current gray scale brightness adjustment stepping value, current cycle times and current brightness state change times;
judging whether the current brightness state change frequency is 0 or not;
if not, according to Val being 1+ St/2(AdjT-FT+1)Calculating a single-point brightness adjustment stepping value Val; wherein St is the current gray scale brightness adjustment stepping value, AdjT is the current cycle number, and FT is the current brightness state change number;
adding the single-point brightness adjustment stepping value Val into a current gamma register value;
and repeatedly executing the steps of obtaining the brightness adjustment stepping value of the current gray scale, the current cycle number and the current brightness state change number until the current display brightness value is in a target brightness range corresponding to the target gray scale and/or the current cycle number is greater than the maximum value of the cycle number.
In a second aspect, an embodiment of the present invention further provides a gray scale brightness adjusting apparatus for a display panel, including:
the current state value acquisition module is used for acquiring a current gray scale brightness adjustment stepping value, current cycle times and current brightness state change times when the current display brightness value is not in a target brightness adjustment range corresponding to a target gray scale;
the brightness state judging module is used for judging whether the change times of the current brightness state is 0 or not;
a step value calculating module for calculating the value Val as 1+ St/2 when the current brightness state change time is not 0(AdjT-FT+1)Calculating a single-point brightness adjustment stepping value Val; wherein St is the current gray scale brightness adjustment stepping value, AdjT is the current cycle number, and FT is the current brightness state change number;
the register value adjusting module is used for adding the single-point brightness adjusting stepping value Val into a current gamma register value;
and the circulating module is used for repeatedly executing the steps of obtaining the brightness adjustment stepping value of the current gray scale, the current circulating times and the current brightness state change times until the current display brightness value is in a target brightness range corresponding to the target gray scale and/or the current circulating times are greater than the maximum circulating times.
According to the gray scale brightness adjusting method and device of the display panel provided by the embodiment of the invention, when the current display brightness value is not in the target brightness adjusting range corresponding to the target gray scale, the current gray scale brightness adjusting step value, the current cycle number and the current brightness state change number are adjusted according to the current gray scale brightness, and the Val is 1+ St/2(AdjT-FT+1)The formula obtains the single-point brightness adjustment stepping value Val, and adds the single-point brightness adjustment stepping value Val to the current gamma register value until the current display brightness value is within the target brightness adjustment range corresponding to the target gray scale, so as to determine the gamma register value corresponding to the target gray scale. Therefore, compared with the mode of adjusting the gamma register value by adopting a fixed single-point brightness adjusting step value, the embodiment of the invention can determine the single-point brightness adjusting step value required each time based on the corresponding calculation formula of the single-point brightness adjusting step value, thereby quickly adjusting the gamma register value to the range of the required gamma register valueThe adjusting efficiency of the gamma register value can be improved, and the production effect of the display panel can be improved; meanwhile, the needed single-point brightness adjustment stepping value is calculated based on a single-point brightness adjustment stepping value calculation formula, so that the gray scale brightness adjustment mode is not limited to a certain display panel, but can be adjusted according to gamma register values of display panels with different characteristic differences, the adjustment modes of different gamma register values do not need to be provided according to the display panels with different characteristic differences, the adjustment modes of the gamma register values are simplified, and the reduction of the production cost of the display panels is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a display panel of the related art;
FIG. 2 is a flowchart illustrating a gray scale brightness adjustment method for a display panel according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a gray scale brightness adjustment method for a display panel according to another embodiment of the present invention;
fig. 4 is a diagram illustrating a correspondence relationship between a target brightness value and a brightness adjustment step factor according to an embodiment of the present invention;
FIG. 5 is a flowchart of a method for obtaining a current gray-scale brightness adjustment step value according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating a gray-scale brightness adjustment method for a display panel according to another embodiment of the present invention;
fig. 7 is a flowchart of a method for obtaining the number of brightness state changes according to an embodiment of the present invention;
fig. 8 is a block diagram of a gray-scale brightness adjustment apparatus 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.
Fig. 1 is a schematic structural diagram of a display panel in the related art. As shown in fig. 1, the display panel 100 includes a display area 101 and a non-display area 102; the display area 101 includes a plurality of pixels 10 arranged in an array; the non-display area 101 includes a driving chip 20. When the display panel 100 needs to display a corresponding image, the driving chip 20 provides a corresponding data voltage to the corresponding pixel 10 according to the gray scale level required to be displayed by each pixel 10 in the display panel 100, so as to drive the pixel 10 to display light with a corresponding brightness.
Due to the gamma characteristic of human eyes, the display luminance and the gray scale degree of each pixel 10 in the display panel 100 are in a nonlinear relationship, that is, the display luminance of a pixel 10 and the data voltage input to the pixel 10 are in a nonlinear relationship, and the nonlinear relationship can be represented by a gamma curve. Therefore, it is necessary to perform Gamma adjustment on the display panel 100 so that the display brightness of the display panel 100 can conform to the nonlinear relationship, and store the Gamma adjustment result in the form of a parameter value (i.e., Gamma register value) in the register of the driver chip 20. When the display panel 100 displays, the driving chip 20 can provide corresponding data voltages according to the gamma register values corresponding to the gray scale levels, so as to control the display panel 100 to display light with corresponding brightness.
In the prior art, a gamma register value corresponding to a target gray scale is usually adjusted in a fixed gray scale brightness adjustment stepping mode, and the adjustment mode can only adapt to a display panel corresponding to the fixed gray scale brightness adjustment stepping mode, namely, a display panel corresponds to the fixed gray scale brightness adjustment stepping mode, if the gamma register value of the display panel with different characteristic differences needs to be adjusted, the gray scale brightness adjustment stepping mode needs to be changed continuously, the adjustment complexity is increased, and the cost of the display panel is increased; meanwhile, the gamma register value is carried out on the display panel by adopting fixed gray scale brightness adjustment steps, and overshoot or insufficient adjustment is easy to occur in the adjustment process, so that the adjustment cannot be carried out in a required range, the adjustment speed is slow, and the production efficiency of the display panel is influenced.
In order to solve the above technical problems, embodiments of the present invention provide a gray scale brightness adjusting method for a display panel, so as to adjust a gamma register value corresponding to a target gray scale of the display panel, where the gray scale brightness adjusting method for the display panel can be implemented by using the gray scale brightness adjusting apparatus for the display panel provided by embodiments of the present invention, and the gray scale brightness adjusting apparatus for the display panel can be implemented by software and/or hardware. Fig. 2 is a flowchart of a gray-scale brightness adjustment method of a display panel according to an embodiment of the present invention. As shown in fig. 2, the gray scale brightness adjusting method of the display panel according to the embodiment of the present invention includes:
s110, when the current display brightness value is not in the target brightness adjusting range corresponding to the target gray scale, the current gray scale brightness adjusting step value, the current cycle number and the current brightness state change number are obtained.
Specifically, the current gray-scale brightness adjustment step value is a coefficient related to the target gray scale, the target brightness, and the current display brightness value, and may be obtained by table lookup and/or calculation. The target gray scale is a theoretical luminous brightness level presented by a pixel corresponding to the display panel, the theoretical luminous brightness level is a target brightness value corresponding to a brightness value accepted by human eyes, the target brightness value can be changed within a certain range, namely a target brightness adjusting range, and the target brightness adjusting range can be obtained in a calculation and/or table look-up manner. Correspondingly, a corresponding number of registers are usually arranged in a driving chip of the display panel for storing gamma register values corresponding to each target gray scale; the current display brightness value may be a display brightness exhibited by a pixel of the display panel when a corresponding data voltage is provided to the pixel of the display panel according to a current gamma register value corresponding to the target gray scale, which may be detected by an optical probe. The current cycle number is the number of times the gamma register value is currently adjusted, and the initial value of the current cycle number can be considered to be 1, and the cycle number is increased by one every time the gamma register value is changed. The number of current brightness state changes may be the same as or different from the number of cycles, and may be determined according to the relationship between the current display brightness value and the target brightness adjustment range.
S120, judging whether the current brightness state change frequency is 0 or not; if not, executing S130; if yes, go to S140.
S130, according to Val being 1+ St/2(AdjT-FT+1)And calculating the single-point brightness adjustment stepping value Val.
Wherein St is the current gray scale brightness adjustment step value, AdjT is the current cycle number, and FT is the current brightness state change number.
And S140, determining the single-point brightness adjustment stepping value Val according to the fact that the Val is equal to St.
Specifically, when the current luminance state change frequency is 0, it is determined that the luminance state represented by the current display luminance value has not changed or the current cycle frequency is an initial value (for example, the current cycle frequency is 1), and at this time, an initial value may be directly assigned to the single-point luminance adjustment step value Val as the current grayscale luminance adjustment step value St; if the number of times of change of the current brightness state is not 0, it indicates that the brightness state represented by the current display brightness value has changed, and at this time, the step value St, the current cycle number AdjT and the current brightness state change number FT may be adjusted according to the current gray-scale brightness, based on Val being 1+ St/2(AdjT-FT +1), the single-point brightness adjustment step value Val is calculated, i.e. the single-point brightness adjustment step value is not only related to the current gray-scale brightness adjustment step value St, but also to the current brightness state change number FT and the cycle number AdjT.
And S150, adding the single-point brightness adjustment stepping value Val into the current gamma register value.
And S160, repeatedly executing the steps from S110 to S150 until the current display brightness value is in the target brightness range corresponding to the target gray scale and/or the current cycle number is greater than the maximum cycle number.
Specifically, after the single-point brightness adjustment step value Val is obtained, the single-point brightness adjustment step value Val may be added to the current gamma register value to change the current gamma register value, and the changed gamma register value may be written into the driver chip; when the driving chip provides the data voltage corresponding to the target gray scale to the corresponding pixel in the display panel according to the changed gamma register value, the current display brightness value of the display panel can be obtained again, and when the current display brightness value is not in the target brightness range corresponding to the target gray scale, the single-point brightness adjusting stepping value Val is determined again according to the current gray scale brightness adjusting stepping value St, the current cycle number AdjT and the current brightness state change number FT, and when the single-point brightness adjusting stepping value Val is added to the current gamma register value, the current gamma register value is changed again; until the driving chip provides data voltage corresponding to the target gray scale to corresponding pixels in the display panel according to the changed gamma register value, and when the current display brightness value of the display panel is within the target brightness range corresponding to the target gray scale, the current gamma register value can be regarded as the gamma register value corresponding to the target gray scale and stored in the driving chip, so that the gamma register values corresponding to different target gray scales can be obtained, when the display panel displays, the corresponding gamma register value can be searched according to the target gray scale, and the searched gamma register value provides corresponding data voltage, so that the display panel presents light with corresponding brightness levels.
Or, in order to prevent the situation that the current display brightness value cannot be adjusted to the target brightness range after the gamma register value changes for multiple times and a dead cycle occurs, the maximum cycle number may be set as required, so that when the current cycle is greater than the maximum cycle number, the adjustment of the gamma register value may be directly stopped, and the gamma register value may be adjusted again after the initial values of the parameters (such as the gray scale brightness adjustment step value and the gamma register value) are defined again.
To sum up, the gray-scale brightness adjustment method for a display panel according to the embodiments of the present invention assigns the single-point brightness adjustment step value added to the current gamma register value to the current gray-scale brightness adjustment step value when the current brightness state change time is 0, and enables the single-point brightness adjustment step value added to the current gamma register value to be related to the current brightness state change time, the current cycle time, and the current gray-scale brightness adjustment step value when the current brightness state change time is not 0, compared with the case of adjusting the gamma register value by using a single fixed single-point brightness adjustment step value, the embodiment of the present invention selects the corresponding single-point brightness adjustment step value according to the current brightness state change time, so as to accelerate the adjustment of the gamma register value to the required range, and adapt to display panels with different screen body characteristic differences, thereby being beneficial to improving the production efficiency of the display panel and reducing the production cost of the display panel.
In addition, after the step value of the single-point brightness adjustment is added to the current gamma register value, it can be determined whether the current gamma register value is 0, if the current gamma register value is 0, the process of adjusting the gamma register value can be ended, and the gamma register value can be adjusted again after the initial values are defined for the parameters (such as the step value of the gray-scale brightness adjustment and the gamma register value). Therefore, the phenomenon that the display panel cannot display and emit light because the gamma register value is 0 and corresponding data voltage cannot be provided according to the gamma register value can be prevented.
Optionally, since the current gray-scale brightness adjustment step value is related to the current display brightness value, the target brightness value and the target gray scale, a brightness adjustment step coefficient corresponding to the target brightness value is further obtained before obtaining the current gray-scale brightness adjustment step value, and the current gray-scale brightness adjustment step value is calculated according to St ═ Lm-Ln |/Ln × Lstep, so that the current brightness adjustment step coefficient can be further calculated according to the gray-scale brightness adjustment step coefficient. FIG. 3 is a flowchart illustrating a gray-scale brightness adjustment method for a display panel according to another embodiment of the present invention. As shown in fig. 3, the gray scale brightness adjusting method according to the embodiment of the present invention includes:
s210, when a display signal corresponding to the target gray scale is provided for the display panel based on the current gamma register value, the current display brightness value of the display panel, the target brightness value corresponding to the target gray scale and the brightness adjustment limit value are obtained.
Specifically, when a display signal (i.e., a data voltage) corresponding to a target gray scale is provided to the display panel based on the current gamma register value, the display panel can present light with corresponding brightness, and the current display brightness value of the display panel can be obtained through an optical detector and the like; and the target gray level corresponds to the targetThe scale value may be obtained by table lookup or calculation. For example, when the brightness that can be presented by the display panel is divided into 0-255 levels, the target brightness L corresponding to the maximum brightness level 255 can be obtained255Calculating to obtain the target brightness Ln corresponding to the target gray level n, wherein the calculation formula is as follows:
Ln＝L255*(n/255)2.2
accordingly, the brightness adjustment limit value may be a parameter value set according to requirements, which may be related to the brightness change limit that the human eye can feel.
S220, according to Lmin ═ Ln-LlimitAnd Lmax ═ Ln + LlimitDetermining a target Brightness adjustment Range [ Lmin, Lmax ]]。
Where Ln is a target brightness value, LlimitIs the brightness adjustment limit value.
S230, judging whether the current display brightness value is in the target brightness adjusting range; if yes, go to S240; if not, go to S250.
S240, taking the current gamma register value as the gamma register value corresponding to the target gray scale.
And S250, acquiring the brightness adjustment stepping value of the current gray scale, the current cycle number and the current brightness state change number.
Specifically, when the current display brightness value of the display panel is obtained by means of an optical detector and the like, whether the current display brightness value is within the target brightness adjustment range or not can be judged; when the current display brightness value Lm is greater than or equal to Lmin and less than or equal to Lmax, the current display brightness value may be considered to be within the target brightness adjustment range, and at this time, the current gamma register value may be stored in a register of the driving chip as a gamma register value corresponding to the target gray scale; and when the current display brightness value Lm is less than Lmin or greater than Lmax, it is considered that the gamma register value corresponding to the target gray scale needs to be adjusted within the target brightness range of the current display brightness value, that is, the single-point brightness adjustment step value Val is determined by obtaining the current gray scale brightness adjustment step value, the current cycle number, and the current brightness state change number, and based on the current gray scale brightness adjustment step value, the current cycle number, and the current brightness state change number, so as to add the single-point brightness adjustment step value Val to the current gamma register value, thereby adjusting the current gamma register value.
Optionally, the manner of obtaining the current gray-scale brightness adjustment step value may be: acquiring a brightness adjustment stepping coefficient corresponding to a target brightness value; calculating the current gray scale brightness adjustment stepping value St according to St | Lm-Ln |/Lstep; lm is the current display brightness value, Lstep is the brightness adjustment stepping coefficient, and Lm is the target brightness value.
For example, since the target gray scale and the target brightness value have a one-to-one correspondence relationship, the brightness adjustment stepping coefficient corresponding to the target gray scale may be determined according to the target brightness value. Different brightness adjustment stepping coefficients can be determined according to the target brightness value. Fig. 4 is a diagram illustrating a correspondence relationship between a target brightness value and a brightness adjustment step coefficient according to an embodiment of the present invention. As shown in fig. 4, when the target luminance value Ln is between [0.01, 100], the luminance adjustment step coefficient and the target luminance value satisfy a piecewise linear relationship, and the amount of change in the luminance adjustment step coefficient is in a downward trend as the target luminance value Ln increases. When the target brightness value Ln is less than 0.01, the brightness adjustment step coefficient may be a fixed value, for example, Lstep is 20; when the target luminance value Ln is greater than 100, the luminance adjustment step coefficient may also be a fixed value, for example, Lstep is 400.
It should be noted that, the foregoing is only an exemplary relationship between the target brightness value and the brightness adjustment stepping coefficient provided by the embodiment of the present invention, and is not a specific limitation of the embodiment of the present invention. In the embodiment of the present invention, the manner of obtaining the brightness adjustment stepping coefficient may be any one of obtaining manners known to those skilled in the art, and is not limited herein.
S260, judging whether the change frequency of the current brightness state is 0 or not; if yes, go to S270; if not, go to step S280.
And S270, determining the single-point brightness adjustment stepping value Val according to the fact that the value Val is equal to St.
S280, according to Val being 1+ St/2(AdjT-FT+1)Calculating a single-point brightness adjustment stepping value Val; wherein St is the current gray scale brightness adjustment step value, AdjT is the current cycle number, and FT is the current brightness state change number.
S290, adding the single-point brightness adjustment stepping value Val into the current gamma register value;
and S2100, repeatedly executing the steps from S210 to S290 until the current display brightness value is in the target brightness range corresponding to the target gray scale and/or the current cycle number is larger than the maximum cycle number.
To sum up, the embodiment of the invention obtains the target brightness adjustment range corresponding to the target gray scale according to the target brightness value corresponding to the target gray scale and the brightness variation adjustment limit value, and determines whether the current display brightness value is within the target brightness adjustment range, it may be determined whether the current gamma register value needs to be adjusted, and when the current gamma register value needs to be adjusted, can determine a single-point brightness adjustment step value based on the current brightness state change number, the current cycle number, and the current gray-scale brightness adjustment step value to adjust the current gamma register value, therefore, the gamma register value can be quickly adjusted to the required range, and the mode of adjusting the gamma register value can adapt to display panels with different screen body characteristic differences, so that the production efficiency of the display panels is improved, and the production cost of the display panels is reduced.
Optionally, the current gray-scale brightness adjustment step value is related to a brightness adjustment step coefficient corresponding to the target brightness value, so as to calculate the current gray-scale brightness adjustment step value according to the brightness adjustment step coefficient, and after the current gray-scale brightness adjustment step value is calculated, it can be further determined whether the current gray-scale brightness adjustment step value is greater than the brightness adjustment step maximum value, so as to further accurately determine the current gray-scale brightness adjustment step value. Fig. 5 is a flowchart of a method for obtaining a current gray-scale brightness adjustment step value according to an embodiment of the present invention. As shown in fig. 5, the method for obtaining the current gray-scale brightness adjustment step value includes:
and S251, acquiring a brightness adjustment stepping coefficient corresponding to the target brightness value.
S252, calculating a current gray scale brightness adjustment stepping value St according to St | Lm-Ln |/Lstep; wherein Lm is the current display brightness value and Lstep is the brightness adjustment stepping coefficient.
S253, judging whether the current gray scale brightness adjustment stepping value is larger than the brightness adjustment stepping maximum value or not; if yes, go to S254.
And S254, taking the maximum brightness adjustment step value as the current gray scale brightness adjustment step value.
Specifically, since the current gray-scale brightness adjustment step value is related to the brightness adjustment step coefficient, the target brightness value and the current display brightness value, when the current display brightness value is too large or too small, the obtained current gray-scale brightness adjustment step value is larger; and in the subsequent step value of brightness adjustment according to the current gray scale, the determined single-point brightness adjustment step value is larger, so that the change of the current gamma register value is larger, and the gamma register value is excessively adjusted. Therefore, the brightness adjustment stepping maximum value can be used as the current gray scale brightness adjustment stepping value to prevent the gamma register value from being excessively adjusted, and the adjustment speed and accuracy of the gamma register value can be improved.
Optionally, before obtaining the current brightness state change times, determining a current brightness state value according to a relationship between a current display brightness value and an upper limit value and a lower limit value of a target brightness adjustment range; and after increasing the current gamma register value by the single-point brightness adjustment step value Val, the current brightness state value may be further used as the final brightness state value. FIG. 6 is a flowchart illustrating a gray-scale brightness adjustment method for a display panel according to another embodiment of the present invention. As shown in fig. 6, the gray scale brightness adjusting method of the display panel includes:
s310, when the current display brightness value is not in the target brightness adjusting range corresponding to the target gray scale, determining the current brightness state value according to the relationship between the current display brightness value and the upper limit value and the lower limit value of the target brightness adjusting range.
Specifically, when the current display brightness value is not within the brightness adjustment range, the current display brightness value may be greater than the upper limit value of the target brightness adjustment range or less than the lower limit value of the target brightness adjustment range; when the current display brightness value is greater than the upper limit value of the target brightness adjustment range, the current brightness state may be considered as the first brightness state, and the current brightness state value Pst may be 1, and when the current display brightness value is less than the lower limit value of the target brightness adjustment range, the current brightness state may be considered as the second brightness state, and the current brightness state value Pst may be 0.
S320, obtaining the brightness adjustment stepping value of the current gray scale, the current cycle number and the current brightness state change number.
Specifically, the current brightness state change frequency is related to whether the current brightness state value changes, and the current brightness state change frequency may be determined to be the same as or different from the adjustment frequency (i.e., the current cycle frequency) of the current gamma register value according to whether the current brightness state value changes. After the gamma register value changes, if the current brightness state value Pst is changed from 1 to 0, the brightness state is considered to have changed, and the current brightness state change times can be equal to the current cycle times; after the gamma register is changed, if the current brightness state value Pst is kept to be 1 or 0, the brightness state is considered to be unchanged, and at this time, the number of times of change of the current brightness state can be made equal to 0.
S330, judging whether the current brightness state change frequency is 0; if yes, go to S340; if not, go to S350.
And S340, determining the single-point brightness adjustment stepping value Val according to the fact that the Val is equal to St.
S350, according to Val, 1+ St/2(AdjT-FT+1)Calculating a single-point brightness adjustment stepping value Val; wherein St is the current gray scale brightness adjustment step value, AdjT is the current cycle number, and FT is the current brightness state change number.
And S360, adding the single-point brightness adjustment stepping value Val into the current gamma register value.
And S370, taking the current brightness state value as a final brightness state value.
Specifically, since the number of times of change of the current brightness state is related to whether the current brightness state value changes, after the step value Val for adjusting the single-point brightness is added to the current gamma register value, the current brightness state value also needs to be used as the final brightness state value, so that after the current brightness state value is obtained next time, the current brightness state value can be compared with the final brightness state value, and the current brightness state value is judged to have changed compared with the final brightness state value, so that the number of times of change of the current brightness state can be determined according to the change of the current brightness state value.
And S380, repeatedly executing the steps from S310 to S370 until the current display brightness value is in the target brightness range corresponding to the target gray scale and/or the current cycle number is larger than the maximum cycle number.
To sum up, the embodiment of the present invention determines the current brightness state value according to the relationship between the current display brightness and the upper limit and the lower limit of the target brightness adjustment range, determines the current brightness state change frequency based on the change condition of the current brightness state value, and determines the corresponding single-point brightness adjustment step based on the current brightness state change frequency, so that the gamma register value can be quickly adjusted to the required range by using the determined single-point brightness adjustment step, and the adjustment method can adapt to display panels with different screen body characteristic differences, thereby facilitating the improvement of the production efficiency of the display panels and the reduction of the production cost of the display panels.
Optionally, because the number of times of change of the current brightness state is related to the number of times of adjustment of the current gamma register value and the change situation of the current brightness state, the number of times of change of the current brightness state can be determined according to the number of times of adjustment of the current gamma register value and the change situation of the current brightness state. Fig. 7 is a flowchart of a method for acquiring a number of brightness state changes according to an embodiment of the present invention. As shown in fig. 7, the method for acquiring the number of brightness state changes includes:
s321, obtaining the adjusting times of the current gamma register value.
S322, judging whether the adjusting times are equal to 1; if not, executing S323; if yes, go to S324.
S323, judging whether the current brightness state value is equal to the final brightness state value; if yes, go to S324; if not, S325 is executed.
And S324, determining that the current brightness state change frequency is 0.
And S325, determining that the current brightness state change times are equal to the current circulation times.
Specifically, the adjustment times of the current gamma register are the current cycle times, and when the adjustment times of the current gamma register are equal to 1, the gamma register value can be considered to be adjusted for the first time, and an initial value of 0 can be assigned to the current brightness state change times; when the adjustment times of the current gamma register are not equal to 1, that is, the adjustment times of the current gamma register are any integer greater than 1, it can be considered that the gamma register value is not adjusted for the first time. Since the final brightness state value is assigned after the gamma register value is adjusted each time, when the gamma register value is not adjusted for the first time, whether the final brightness state value is equal to the current brightness state value or not can be compared, and when the final brightness state value is equal to the current brightness state value, the current display brightness value can be considered to be kept smaller than the lower limit value of the target brightness adjustment range or larger than the upper limit value of the target brightness adjustment range, that is, the current brightness state is not changed, and the change frequency of the current brightness state can be kept to be 0; when the final brightness state value is not equal to the current brightness state value, the current brightness state is considered to have changed, and the current brightness state change times can be made equal to the current cycle times.
Therefore, the change situation of the current display brightness value can be accurately controlled by combining the change times of the current brightness state with the adjustment times of the current gamma register value and the brightness state change, and the corresponding single-point brightness adjustment stepping value is determined according to the change situation of the current display brightness value, so that the gamma register value can be accurately and quickly adjusted to the required range.
Based on the same inventive concept, the embodiment of the present invention further provides a gray scale brightness adjusting apparatus for a display panel, which can be used to execute the gray scale brightness adjusting method for the display panel of the embodiment of the present invention, and the gray scale brightness adjusting apparatus for the display panel can be implemented in a software and/or hardware manner.
For example, fig. 8 is a block diagram of a gray-scale brightness adjusting apparatus of a display panel according to an embodiment of the present invention. As shown in fig. 8, the gray-scale brightness adjusting apparatus of the display panel includes a current state value obtaining module 81, a brightness state judging module 82, a step value calculating module 83, a register value adjusting module 84, and a loop module 85. The current state value obtaining module 81 is configured to obtain a current gray scale brightness adjustment step value, a current cycle number, and a current brightness state change number when the current display brightness value is not within a target brightness adjustment range corresponding to the target gray scale; the brightness state judging module 82 is configured to judge whether the current brightness state change frequency is 0; the step value calculating module 83 is used for setting Val to 1+ St/2 when the current brightness state change time is not 0(AdjT-FT+1)Calculating a single-point brightness adjustment stepping value Val; wherein St is the current gray scale brightness adjustment stepping value, AdjT is the current cycle number, and FT is the current brightness state change number; the register value adjustment module 84 is configured to add the single-dot luminance adjustment step value Val to the current gamma register value; the loop module 85 is configured to repeatedly execute the steps of obtaining the brightness adjustment step value of the current gray scale, the current loop time, and the current brightness state change time until the current display brightness value is within the target brightness range corresponding to the target gray scale and/or the current loop time is greater than the maximum value of the loop time.
The embodiment of the invention can determine the single-point brightness adjustment stepping value required each time based on the corresponding calculation formula of the single-point brightness adjustment stepping value, thereby quickly adjusting the gamma register value to the range of the required gamma register value, further improving the adjustment efficiency of the gamma register value and being beneficial to improving the production effect of the display panel; meanwhile, the needed single-point brightness adjustment stepping value is calculated based on a single-point brightness adjustment stepping value calculation formula, so that the gray scale brightness adjustment mode is not limited to a certain display panel, but can be adjusted according to gamma register values of display panels with different characteristic differences, the adjustment modes of different gamma register values do not need to be provided according to the display panels with different characteristic differences, the adjustment modes of the gamma register values are simplified, and the reduction of the production cost of the display panels is facilitated.
It should be noted that the gray-scale brightness adjusting device of the display panel provided in the embodiment of the present invention can execute the gray-scale brightness adjusting method of the display panel provided in any embodiment of the present invention, and the gray-scale brightness adjusting device of the display panel provided in the embodiment of the present invention has the technical features of the gray-scale brightness adjusting method of the display panel provided in the embodiment of the present invention, so as to achieve the beneficial effects of the gray-scale brightness adjusting method of the display panel provided in the embodiment of the present invention.
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 modifications, rearrangements, combinations 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 gray scale brightness adjusting method of a display panel is characterized by comprising the following steps:
when the current display brightness value is not in the target brightness adjustment range corresponding to the target gray scale, acquiring a current gray scale brightness adjustment stepping value, current cycle times and current brightness state change times;
judging whether the current brightness state change frequency is 0 or not;
if not, according to Val being 1+ St/2(AdjT-FT+1)Calculating a single-point brightness adjustment stepping value Val; wherein St is the current gray scale brightness adjustment stepping value, AdjT is the current cycle number, and FT is the current brightness state change number;
adding the single-point brightness adjustment stepping value Val into a current gamma register value;
and repeatedly executing the steps of obtaining the brightness adjustment stepping value of the current gray scale, the current cycle number and the current brightness state change number until the current display brightness value is in a target brightness range corresponding to the target gray scale and/or the current cycle number is greater than the maximum value of the cycle number.
2. The gray-scale brightness adjustment method according to claim 1, further comprising, before obtaining the gray-scale brightness adjustment step value:
when a display signal corresponding to a target gray scale is provided for a display panel based on a current gamma register value, acquiring a current display brightness value of the display panel, a target brightness value corresponding to the target gray scale and a brightness adjustment limit value;
according to Lmin ═ Ln-LlimitAnd Lmax ═ Ln + LlimitDetermining a target Brightness adjustment Range [ Lmin, Lmax ]](ii) a Wherein Ln is the target brightness value, LlimitAdjusting the limit value for the brightness;
judging whether the current display brightness value is within the target brightness adjusting range;
and if so, taking the current gamma register value as the gamma register value corresponding to the target gray scale.
3. The gray scale brightness adjustment method of claim 2, wherein obtaining gray scale brightness adjustment steps comprises:
acquiring a brightness adjustment stepping coefficient corresponding to the target brightness value;
calculating the current gray scale brightness adjustment stepping value St according to St | Lm-Ln |/Lstep; wherein, Lm is the current display brightness value, and Lstep is the brightness adjustment stepping coefficient.
4. The gray scale luminance adjustment method as claimed in claim 3, further comprising:
judging whether the current gray scale brightness adjustment stepping value is larger than a brightness adjustment stepping maximum value or not;
and if so, taking the maximum brightness adjustment step value as the current gray scale brightness adjustment step value.
5. The gray scale brightness adjustment method of claim 1, before obtaining the current brightness state change number, comprising:
when the current display brightness value is not in the target brightness adjusting range corresponding to the target gray scale, determining the current brightness state value according to the relationship between the current display brightness value and the upper limit value and the lower limit value of the target brightness adjusting range;
after increasing the current gamma register value by the single-point brightness adjustment step value Val, further comprising:
and taking the current brightness state value as a final brightness state value.
6. The gray scale brightness adjustment method of claim 5, wherein obtaining the current brightness state change number comprises:
acquiring the adjustment times of the current gamma register value;
judging whether the adjusting times are equal to 1 or not;
and if so, determining that the current brightness state change frequency is 0.
7. The gray scale brightness adjustment method of claim 6, wherein obtaining the current brightness state change times further comprises:
when the adjusting times are not equal to 1, judging whether the current brightness state value is equal to the final brightness state value or not;
and if so, determining that the current brightness state change frequency is 0.
8. The gray scale luminance adjustment method as claimed in claim 7, further comprising:
and when the current brightness state value is not equal to the final brightness state value, determining that the current brightness state change times are equal to the current cycle times.
9. The gray-scale luminance adjustment method according to any one of claims 1 to 8, further comprising:
and when the current brightness state change time is not 0, determining the single-point brightness adjustment stepping value Val according to the condition that Val is St.
10. A gray scale brightness adjusting apparatus of a display panel, comprising:
the current state value acquisition module is used for acquiring a current gray scale brightness adjustment stepping value, current cycle times and current brightness state change times when the current display brightness value is not in a target brightness adjustment range corresponding to a target gray scale;
the brightness state judging module is used for judging whether the change times of the current brightness state is 0 or not;
a step value calculating module for calculating the value Val as 1+ St/2 when the current brightness state change time is not 0(AdjT -FT+1)Calculating a single-point brightness adjustment stepping value Val; wherein St is the current gray scale brightness adjustment stepping value, AdjT is the current cycle number, and FT is the current brightness state change number;
the register value adjusting module is used for adding the single-point brightness adjusting stepping value Val into a current gamma register value;
and the circulating module is used for repeatedly executing the steps of obtaining the brightness adjustment stepping value of the current gray scale, the current circulating times and the current brightness state change times until the current display brightness value is in a target brightness range corresponding to the target gray scale and/or the current circulating times are greater than the maximum circulating times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110281574.0A CN113035152B (en) | 2021-03-16 | 2021-03-16 | Gray scale brightness adjusting method and device of display panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110281574.0A CN113035152B (en) | 2021-03-16 | 2021-03-16 | Gray scale brightness adjusting method and device of display panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113035152A true CN113035152A (en) | 2021-06-25 |
| CN113035152B CN113035152B (en) | 2022-06-03 |
Family
ID=76471038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110281574.0A Active CN113035152B (en) | 2021-03-16 | 2021-03-16 | Gray scale brightness adjusting method and device of display panel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113035152B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114360426A (en) * | 2022-01-05 | 2022-04-15 | 苏州华兴源创科技股份有限公司 | Gamma adjustment method, device, computer equipment and storage medium |
| CN114664256A (en) * | 2022-04-24 | 2022-06-24 | 武汉天马微电子有限公司 | Display panel and display device |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1711575A (en) * | 2002-11-04 | 2005-12-21 | 伊菲雷技术公司 | Method and apparatus for gray-scale gamma correction for electroluminescent displays |
| CN102467862A (en) * | 2010-11-17 | 2012-05-23 | 京东方科技集团股份有限公司 | Voltage regulation method and device of liquid crystal display panel |
| CN102667899A (en) * | 2009-11-27 | 2012-09-12 | 佳能株式会社 | Image display apparatus |
| WO2016079147A2 (en) * | 2014-11-17 | 2016-05-26 | Universität des Saarlandes | A local dimming algorithm and device |
| CN106023888A (en) * | 2016-07-06 | 2016-10-12 | 云南北方奥雷德光电科技股份有限公司 | OLED miniaturized display constant-brightness modulation method |
| US20160314761A1 (en) * | 2015-04-21 | 2016-10-27 | Samsung Display Co., Ltd. | Display device and method of driving a display device |
| CN106847157A (en) * | 2017-03-24 | 2017-06-13 | 上海天马有机发光显示技术有限公司 | The luminance compensation method and device of a kind of display panel |
| CN107610649A (en) * | 2017-10-26 | 2018-01-19 | 上海天马有机发光显示技术有限公司 | The optical compensation method and device of a kind of display panel |
| WO2018156999A2 (en) * | 2017-02-23 | 2018-08-30 | Synaptics Incorporated | Encoding demura calibration information |
| CN110021272A (en) * | 2019-01-29 | 2019-07-16 | 信利（惠州）智能显示有限公司 | GAMMA adjusting method, device, computer and the storage medium of display module |
| CN110364122A (en) * | 2019-07-31 | 2019-10-22 | 厦门天马微电子有限公司 | Backlight brightness values adjusting method, device, driving chip and display device |
| CN110890046A (en) * | 2018-09-10 | 2020-03-17 | 京东方智慧物联科技有限公司 | Method and device for modulating brightness-gray scale curve of display equipment and electronic equipment |
| CN110910847A (en) * | 2019-11-25 | 2020-03-24 | 深圳吉迪思电子科技有限公司 | Gamma correction method and device for display module |
| EP3706106A1 (en) * | 2017-11-02 | 2020-09-09 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Method for compressing gray scale compensation table of oled display panel |
-
2021
- 2021-03-16 CN CN202110281574.0A patent/CN113035152B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1711575A (en) * | 2002-11-04 | 2005-12-21 | 伊菲雷技术公司 | Method and apparatus for gray-scale gamma correction for electroluminescent displays |
| CN102667899A (en) * | 2009-11-27 | 2012-09-12 | 佳能株式会社 | Image display apparatus |
| CN102467862A (en) * | 2010-11-17 | 2012-05-23 | 京东方科技集团股份有限公司 | Voltage regulation method and device of liquid crystal display panel |
| WO2016079147A2 (en) * | 2014-11-17 | 2016-05-26 | Universität des Saarlandes | A local dimming algorithm and device |
| US20160314761A1 (en) * | 2015-04-21 | 2016-10-27 | Samsung Display Co., Ltd. | Display device and method of driving a display device |
| CN106023888A (en) * | 2016-07-06 | 2016-10-12 | 云南北方奥雷德光电科技股份有限公司 | OLED miniaturized display constant-brightness modulation method |
| WO2018156999A2 (en) * | 2017-02-23 | 2018-08-30 | Synaptics Incorporated | Encoding demura calibration information |
| CN106847157A (en) * | 2017-03-24 | 2017-06-13 | 上海天马有机发光显示技术有限公司 | The luminance compensation method and device of a kind of display panel |
| CN107610649A (en) * | 2017-10-26 | 2018-01-19 | 上海天马有机发光显示技术有限公司 | The optical compensation method and device of a kind of display panel |
| EP3706106A1 (en) * | 2017-11-02 | 2020-09-09 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Method for compressing gray scale compensation table of oled display panel |
| CN110890046A (en) * | 2018-09-10 | 2020-03-17 | 京东方智慧物联科技有限公司 | Method and device for modulating brightness-gray scale curve of display equipment and electronic equipment |
| CN110021272A (en) * | 2019-01-29 | 2019-07-16 | 信利（惠州）智能显示有限公司 | GAMMA adjusting method, device, computer and the storage medium of display module |
| CN110364122A (en) * | 2019-07-31 | 2019-10-22 | 厦门天马微电子有限公司 | Backlight brightness values adjusting method, device, driving chip and display device |
| CN110910847A (en) * | 2019-11-25 | 2020-03-24 | 深圳吉迪思电子科技有限公司 | Gamma correction method and device for display module |
Non-Patent Citations (2)
| Title |
|---|
| 吕岸,李峰: "《机载显示器亮度自适应调节算法研究》", 《航空电子技术》 * |
| 尹景隆，程宏斌，王瑞光，赵健博，袁庆海: "《基于分段伽马变换的医用LED显示控制系统设计》", 《现代电子技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114360426A (en) * | 2022-01-05 | 2022-04-15 | 苏州华兴源创科技股份有限公司 | Gamma adjustment method, device, computer equipment and storage medium |
| CN114664256A (en) * | 2022-04-24 | 2022-06-24 | 武汉天马微电子有限公司 | Display panel and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113035152B (en) | 2022-06-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6898971B2 (en) | Display device drive | |
| US11200844B2 (en) | Method and apparatus for controlling brightness of display, and terminal device | |
| KR100791185B1 (en) | Display device | |
| KR100944595B1 (en) | Display device, display driver, image display method, electronic apparatus and image display driver | |
| KR101443371B1 (en) | Liquid crystal display device and driving method of the same | |
| CN108665866B (en) | Method for acquiring backlight diffusion transmission parameters and display control method and device | |
| KR101248872B1 (en) | Image display apparatus and high quality image providing method thereof | |
| CN109215549B (en) | Display screen dimming method and device, storage medium and electronic equipment | |
| CN113035152B (en) | Gray scale brightness adjusting method and device of display panel | |
| KR20030073390A (en) | A liquid crystal display for improving dynamic contrast and a method for generating gamma voltages for the liquid crystal display | |
| KR20030013299A (en) | Drive control device for a display apparatus, video image display apparatus and method of controllintg the driving of the video image display apparatus | |
| KR100701515B1 (en) | Method of driving a display, display, and computer-readable medium on which computer program for the same is recorded | |
| KR101073006B1 (en) | Display device and method for controling brightness of images in display device | |
| US9779514B2 (en) | Display device, display panel driver and driving method of display panel | |
| JP2007536594A (en) | Color display device | |
| JP2006030834A (en) | Driving method employing overdrive control method and liquid crystal display device using the same | |
| KR20150071549A (en) | Display device and display device driving method using the same | |
| CN113643660A (en) | Display device and method for driving display device | |
| JP5093722B2 (en) | Liquid crystal display device, image display method thereof, and program for image display | |
| WO2022222969A1 (en) | Brightness adjustment method for backlight module and related device | |
| KR20110052120A (en) | Driving method and device for plasma display panel | |
| KR102195812B1 (en) | Display device and driving method thereof | |
| JP4457548B2 (en) | Image display apparatus, control method thereof, and control program | |
| US11941790B2 (en) | Image data processing apparatus and display device for controlling local dimming | |
| US20220130340A1 (en) | Display apparatus that controls amount of light from light source in accordance with video signal, and control method therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |