CN111508414A - Gamma adjusting method and device for display panel - Google Patents
Gamma adjusting method and device for display panel Download PDFInfo
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Abstract
The invention discloses a gamma adjusting method and a gamma adjusting device for a display panel, which respectively correspond to target brightness of a plurality of preset gray scales under a preset display brightness level instruction; determining a target gray scale corresponding to the target brightness under the second display brightness level instruction according to the preset corresponding relation between the target brightness and the target gray scale; the target data voltage corresponding to the target brightness under the preset display brightness level instruction is determined according to the binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction, a group of gamma voltages under any preset display brightness level instruction in the data voltage dimming interval can be calculated according to a group of gamma voltages under the maximum display brightness level instruction in the data voltage dimming interval, and in one data voltage dimming interval, only gamma debugging is needed under the maximum display brightness level instruction to obtain a group of gamma voltages under the maximum display brightness level instruction, so that the time of gamma debugging and gamma voltage burning can be shortened, and the production line capacity is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a gamma adjusting method and device for a display panel.
Background
With the development of display technology, the demand of terminal market for screen image quality display is continuously increasing at present.
In the prior art, the image quality of the display panel is generally improved by increasing the number of gamma debugging groups, but the gamma debugging time of the production line is long and the production performance of the production line is affected in the above prior art.
Disclosure of Invention
The invention provides a gamma adjusting method and device for a display panel, which are used for shortening the gamma adjusting time of the display panel and improving the production capacity of a production line.
In a first aspect, an embodiment of the present invention provides a gamma adjustment method for a display panel, where at least one data voltage dimming interval is included between a minimum value of a display brightness level command and a maximum value of the display brightness level command of the display panel, two endpoint values of the data voltage dimming interval are a first display brightness level command and a second display brightness level command respectively, and the second display brightness level command is greater than the first display brightness level command;
the display panel gamma adjusting method comprises the following steps:
acquiring target brightness corresponding to a plurality of preset gray scales under a preset display brightness level instruction;
determining a target gray scale corresponding to the target brightness under the second display brightness level instruction according to the preset corresponding relation between the target brightness and the target gray scale;
determining a target data voltage corresponding to the target brightness under the preset display brightness level instruction according to the binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction;
the preset display brightness level instruction belongs to the data voltage dimming interval, and the preset display brightness level instruction is smaller than the second display brightness level instruction.
Optionally, a first data voltage dimming interval and a second data voltage dimming interval are included between the minimum value of the display brightness level instruction of the display panel and the maximum value of the display brightness level instruction, and the second display brightness level instruction corresponding to an endpoint value of the second data voltage dimming interval is the maximum display brightness level instruction; and further comprising a light emission control signal pulse dimming interval between the first data voltage dimming interval and the second data voltage dimming interval;
in the data voltage dimming interval, the display brightness is adjusted only by adjusting the data voltage;
the light-emitting control signal pulse dimming interval at least adjusts the display brightness by adjusting the width of the light-emitting control signal pulse signal.
Optionally, the second data voltage dimming interval is divided into at least two continuous sub-intervals, and the second data voltage dimming interval includes a first boundary display brightness level instruction corresponding to a boundary point of the sub-interval and a second boundary display brightness level instruction corresponding to a boundary point of the second data voltage dimming interval and the light-emitting control signal pulse dimming interval; the preset display brightness level instruction in the second data voltage dimming interval comprises a first boundary display brightness level instruction and a second boundary display brightness level instruction.
Optionally, the refresh frequency corresponding to the first data voltage dimming interval and the second data voltage dimming interval is different.
Optionally, determining a target gray scale corresponding to the target brightness under the second display brightness level instruction according to the preset corresponding relationship between the target brightness and the target gray scale includes:
and determining the target gray scale corresponding to the target brightness under the second display brightness level instruction according to the target brightness, the maximum gray scale under the second display brightness level instruction, and the preset corresponding relation between the display brightness corresponding to the maximum gray scale under the second display brightness level instruction and the target gray scale.
Optionally, the preset corresponding relationship between the target brightness, the maximum gray scale under the second display brightness level instruction, and the display brightness corresponding to the maximum gray scale under the second display brightness level instruction, and the target gray scale is as follows:
Graytarget＝β*Graytuning-Gmaxwherein
Wherein, GraytargetRepresenting a target Gray level, Graytuning-GmaxIndicating the maximum gray level under the second display brightness level command, L vtargetIndicating that the object is brightDegree, L vtuning-GmaxAnd displaying the display brightness corresponding to the maximum gray scale under the second display brightness level instruction.
Optionally, determining a data voltage corresponding to the target gray scale according to the binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction, and determining the data voltage corresponding to the target gray scale as the target data voltage corresponding to the target brightness under the preset display brightness level instruction, includes:
determining a data voltage corresponding to the target gray scale according to a data voltage corresponding to an endpoint gray scale of the binding gray scale interval to which the target gray scale belongs under the second display brightness level instruction;
determining the data voltage corresponding to the target gray scale as the target data voltage corresponding to the target brightness under the preset display brightness level instruction;
preferably, the data voltage corresponding to the target gray level is calculated using the following formula,
wherein, the datatargetData voltage representing the target gray scale, i.e. target data voltage, dataiA first data voltage, data, corresponding to a first endpoint gray scale of a binding point gray scale interval to which the target gray scale belongs under the second display brightness level instructioni+1A second data voltage, Gray, corresponding to a second endpoint Gray scale of the binding Gray scale interval to which the target Gray scale belongs under the second display brightness level instructioniRepresenting a first endpoint Gray level, Gray, of the binding Gray level intervali+1Representing a second endpoint gray level of the binding gray level interval, wherein the second endpoint gray level is greater than the first endpoint gray level.
Optionally, the preset gray scale under the preset display brightness level instruction is equal to the binding gray scale under the second display brightness level instruction.
Optionally, before obtaining the preset display brightness level instruction and the plurality of target brightnesses under the preset display brightness level instruction, the method further includes:
and under the second display brightness level instruction, carrying out gamma debugging on the display panel to obtain the data voltage corresponding to the binding point gray scale under the second display brightness level instruction.
In a second aspect, an embodiment of the present invention further provides a gamma adjusting device for a display panel, where the gamma adjusting device is configured to execute the gamma adjusting method for the display panel provided in the first aspect, at least one data voltage dimming interval is included between a minimum value of a display brightness level command of the display panel and a maximum value of the display brightness level command, two end points of the data voltage dimming interval are a first display brightness level command and a second display brightness level command respectively, and the second display brightness level command is greater than the first display brightness level command;
the display panel gamma adjusting apparatus includes:
the target brightness acquisition module is used for acquiring target brightness corresponding to a plurality of preset gray scales under a preset display brightness level instruction;
the target gray scale determining module is used for determining a target gray scale corresponding to the target brightness under the second display brightness level instruction according to the preset corresponding relation between the target brightness and the target gray scale;
the target data voltage determining module is used for determining a target data voltage corresponding to the target brightness under the preset display brightness level instruction according to the binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction;
the preset display brightness level instruction belongs to the data voltage dimming interval, and the preset display brightness level instruction is smaller than the second display brightness level instruction.
In the method and the device for gamma adjustment of the display panel provided by the embodiment, target brightness respectively corresponding to a plurality of preset gray scales under a preset display brightness level instruction is obtained; determining a target gray scale corresponding to the target brightness under the second display brightness level instruction according to the preset corresponding relation between the target brightness and the target gray scale; and determining a target data voltage corresponding to the target brightness under the preset display brightness level instruction according to the binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction, and further determining a group of gamma voltages under any preset display brightness level instruction in the data voltage dimming interval through calculation according to a group of gamma voltages under the maximum display brightness level instruction in the data voltage dimming interval, namely within one data voltage dimming interval, only performing gamma debugging under the maximum display brightness level instruction to obtain a group of gamma voltages under the maximum display brightness level instruction, so that the time of gamma debugging and gamma voltage burning can be reduced, and the production line capacity is improved.
Drawings
FIG. 1 is a flowchart illustrating a gamma adjustment method for a display panel according to an embodiment of the present invention;
FIG. 2 is a graph of display brightness corresponding to a maximum gray scale and a display brightness level command according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a 7T1C pixel circuit commonly used in the prior art;
FIG. 4 is a curve of the relationship between gray scale and brightness under the second display brightness level command within a data voltage adjustment interval according to an embodiment of the present invention;
FIG. 5 is a curve of a relationship between gray scale and brightness under a preset display brightness level command according to an embodiment of the present invention;
FIG. 6 is a graph showing the relationship between different gray levels of the red, green and blue sub-pixels and the data voltages under the second display brightness level command within a data voltage adjustment interval according to an embodiment of the present invention;
FIG. 7 is a flowchart illustrating another gamma adjustment method for a display panel according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a gamma adjustment apparatus for 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, in the prior art, the image quality of the display panel is usually improved by increasing the number of gamma debugging sets, but the above prior art has a problem that the gamma debugging time of the production line is long, which affects the production performance of the production line. The inventor of the present invention has found that the reason for the above problem is that, in a manner of increasing the number of gamma debugging sets to improve the image quality of the display panel, it is necessary to perform gamma debugging on the display panel under a plurality of different display brightness level commands to obtain a plurality of sets of gamma voltages under different display brightness level commands, thereby increasing the number of gamma sets. Specifically, taking gamma debugging under a display brightness level instruction as an example, under the display brightness level instruction, setting a plurality of binding point gray scales, continuously adjusting data voltages and obtaining display brightness, determining the corresponding data voltages when the target brightness is reached as the data voltages corresponding to the binding point gray scales until the obtained display brightness reaches the target brightness corresponding to the binding point gray scales, and after adjusting and testing each binding point gray scale, determining the data voltages respectively corresponding to each binding point gray scale as a group of gamma voltages under the display brightness level instruction. The process of obtaining a set of gamma voltage to the gamma debugging process under the instruction of a display brightness level is known through the above, the gamma debugging process is more loaded down with trivial details, obtain multiunit gamma voltage through carrying out the gamma debugging under the instruction of different display brightness levels, and then the mode that increases gamma debugging group number causes gamma debugging time longer, and after obtaining multiunit gamma voltage, still need burn the multiunit gamma voltage to drive chip in, make burning record time also can corresponding extension, and debugging and burning record's constitution is accomplished on producing the line usually, consequently finally lead to producing line gamma debugging and burn record time and all lengthen, the production capacity is produced in the influence.
Based on the above problem, an embodiment of the present invention provides a gamma adjustment method for a display panel, where at least one data voltage dimming interval is included between a minimum value of a display brightness level command and a maximum value of the display brightness level command of the display panel, two endpoint values of the data voltage dimming interval are a first display brightness level command and a second display brightness level command respectively, and the second display brightness level command is greater than the first display brightness level command, fig. 1 is a flowchart of the gamma adjustment method for the display panel provided in the embodiment of the present invention, and referring to fig. 1, the gamma adjustment method for the display panel includes:
specifically, a display device such as a mobile phone or a computer generally includes a brightness adjustment key, and a user changes an input display brightness level command, which is also called a Display Brightness Value (DBV) command, by the brightness adjustment key. Each display brightness level instruction can correspond to one display brightness of the maximum gray scale in the display panel, and after the display brightness corresponding to the maximum gray scale in the display panel is changed, the display brightness corresponding to other gray scales can be changed. Specifically, when the display brightness corresponding to the maximum gray scale in the display panel is increased, the display brightness corresponding to other gray scales is also increased; when the display brightness corresponding to the maximum gray scale in the display panel is reduced, the display brightness corresponding to other gray scales is also reduced. Therefore, it can be understood that each input display brightness level instruction may correspond to a brightness level of the display panel, and when the display brightness corresponding to the maximum gray scale in the display panel is larger, the brightness level is larger, and the overall display brightness of the display panel is larger; when the display brightness corresponding to the maximum gray scale in the display panel is smaller, the brightness level is smaller, and the whole display brightness of the display panel is smaller.
Fig. 2 is a graph of the display luminance level command and the display luminance corresponding to the maximum gray scale, in which a horizontal axis DBV represents the display luminance level command, a vertical axis L V represents the display luminance corresponding to the maximum gray scale, taking the range of the display luminance level command as 0-4096 levels as an example, the minimum value of the display luminance level command of the display panel is 0, and the maximum value of the display luminance level command is 4096, taking the display luminance corresponding to the maximum gray scale as 0-600nit as an example, the display luminance corresponding to the minimum value of the display luminance level command is 0, and the display luminance corresponding to the maximum gray scale is 600 nit.
Specifically, at least one data voltage dimming interval is usually included between the minimum value of the display brightness level command and the maximum value of the display brightness level command, and the data voltage dimming interval may further include a light emission control signal pulse dimming interval. The data voltage dimming interval is a display brightness level instruction interval for adjusting the display brightness only by adjusting the data voltage; the light emitting control signal pulse dimming interval is a display brightness level instruction interval for adjusting display brightness at least by adjusting the width of the light emitting control signal pulse signal. Fig. 3 is a schematic structural diagram of a 7T1C pixel circuit commonly used in the prior art, and referring to fig. 3, the pixel circuit includes a data voltage input terminal, a light emitting control signal input terminal, and a light emitting device, for example, a display panel includes the pixel circuit shown in fig. 3, wherein in a data voltage dimming interval, the light emitting brightness of the light emitting device is adjusted only by adjusting the data voltage input to the data voltage input terminal; and in the pulse dimming interval of the light-emitting control signal, adjusting the light-emitting brightness of the light-emitting device at least by adjusting the pulse width of the light-emitting control signal input to the light-emitting control signal input end.
In this step, target brightness corresponding to a plurality of preset gray scales under a preset display brightness level instruction is obtained. Specifically, after the display brightness level command is determined (i.e., the display brightness corresponding to the maximum gray scale is determined), the target brightness corresponding to any gray scale under the display brightness level command may be determined according to the display brightness corresponding to the maximum gray scale. Specifically, under the preset display brightness level instruction, the target brightness corresponding to any gray scale can be calculated according to the following formula,
Lv_Gray＝Lv_Gmax*(xn/Gmax)γ，
wherein L v _ Gray represents the target brightness corresponding to the preset Gray level under the preset display brightness level instruction, L v _ Gmax represents the display brightness corresponding to the maximum Gray level corresponding to the preset display brightness level instruction, and x represents the display brightness corresponding to the maximum Gray level under the preset display brightness level instructionnRepresenting a predetermined gray level, gamma being a constant, in particular, displayThe relationship between the display brightness and the gray scale usually satisfies the curve relationship of gamma 2.2, so that the value of gamma is optionally 2.2.
optionally, for any data voltage dimming interval, the second display brightness level instruction is a maximum display brightness level instruction in the data voltage dimming interval, the preset digital brightness instruction is smaller than the second display brightness level instruction, correspondingly, the display brightness of the maximum gray scale under the preset digital brightness instruction is smaller than the display brightness of the maximum gray scale under the second display brightness level instruction, and then the display brightness of any gray scale under the preset digital brightness instruction is smaller than the display brightness of the corresponding gray scale under the second display brightness level instruction. Therefore, the target brightness corresponding to the preset gray scale under the preset display brightness level instruction necessarily falls within the range from the display brightness corresponding to the minimum gray scale to the display brightness corresponding to the maximum gray scale under the second display brightness level instruction, and correspondingly, the target brightness necessarily corresponds to a certain gray scale (i.e. the target gray scale to be determined) under the second display brightness level instruction. In addition, a specific corresponding relationship exists between the target brightness under the preset display brightness level instruction and the target gray scale under the second display brightness level instruction, that is, the preset corresponding relationship may be preset, and optionally, the preset corresponding relationship between the target brightness under the preset display brightness level instruction and the target gray scale under the second display brightness level instruction may further include other parameters.
Optionally, the step 120 may include:
and step 121, determining a target gray scale corresponding to the target brightness under the second display brightness level instruction according to the target brightness, the maximum gray scale under the second display brightness level instruction, and a preset corresponding relation between the display brightness corresponding to the maximum gray scale under the second display brightness level instruction and the target gray scale.
The target brightness, the maximum gray scale under the second display brightness level instruction, and the display brightness corresponding to the maximum gray scale under the second display brightness level instruction can be known, that is, known quantity, and only the target gray scale is unknown quantity, so that the target gray scale can be obtained through the preset corresponding relation.
Optionally, the preset corresponding relationship between the target brightness, the maximum gray scale under the second display brightness level instruction, and the display brightness corresponding to the maximum gray scale under the second display brightness level instruction and the target gray scale is as follows:
Graytarget＝β*Graytuning-Gmaxwherein
Wherein, GraytargetRepresenting a target Gray level, Graytuning-GmaxIndicating the maximum gray level under the second display brightness level command, L vtargetIndicating the target luminance, L vtuning-GmaxAnd displaying the display brightness corresponding to the maximum gray scale under the second display brightness level instruction.
In the data voltage dimming interval, the preset corresponding relation is formed between the target Gray scale and the target brightness, and the target Gray scale of the preset Gray scale under the preset display brightness level instruction under the second display brightness level instruction can be obtained through calculation of the simple formula in the data voltage dimming interval.
TABLE 1
| Gray-tuning | 255 | 223.74 | 220 |
| Lv-tuning | 600 | 433.6 | |
| Gray-ys | 255 | ||
| Lv- |
450 |
And step 130, determining a target data voltage corresponding to the target brightness under the preset display brightness level instruction according to the binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction.
Specifically, in any data voltage dimming interval, the data voltage corresponding to the tie point gray scale under the second display brightness level instruction may be obtained in advance, for example, by performing gamma debugging under the second display brightness level instruction, that is, the data voltage corresponding to the tie point gray scale under the second display brightness level instruction is known. Optionally, the binding point gray scales may be set in a range from a minimum gray scale to a maximum gray scale, and a number of binding point gray scales in a certain gray scale range may also be set according to actual needs. Because the content of the low gray scale range is prone to color cast, optionally, the number of binding point gray scales in the low gray scale range may be set to be greater than the number of binding point gray scales in the medium and high gray scale range (including the medium gray scale range and the high gray scale range), for example, the minimum gray scale is 0 gray scale, when the maximum gray scale is 255 gray scale, the low gray scale range may be 0-48 gray scale, the medium and high gray scale range may be 49-255 gray scale, and the binding point gray scales may be 255 gray scale, 220 gray scale, 184 gray scale, 148 gray scale, 112 gray scale, 80 gray scale, 48 gray scale, 32 gray scale, 16 gray scale, 8 gray scale, 4 gray scale, 1 gray scale, and 0 gray scale, respectively.
In step 120, a target gray scale of the target brightness under the preset display brightness level command under the second display brightness level command is determined, as mentioned above, for any data voltage dimming interval, the display brightness of the maximum gray scale corresponding to the preset display brightness level command is less than the display brightness of the maximum gray scale corresponding to the second display brightness level command, therefore, the target gray scale corresponding to the target brightness of the preset gray scale (which is necessarily less than or equal to the maximum gray scale) under the preset display brightness level command under the second display brightness level command is necessarily less than the maximum gray scale under the second display brightness level command, therefore, the target gray level falls within a certain binding point gray level interval under the second display brightness level command, and determining the data voltage corresponding to the target gray scale in the binding gray scale interval to which the target gray scale belongs under the second display brightness level instruction.
Optionally, the step 130 may include:
step 131, determining a data voltage corresponding to the target gray scale according to a data voltage corresponding to an endpoint gray scale of the binding gray scale interval to which the target gray scale belongs under the second display brightness level instruction;
alternatively, the data voltage corresponding to the target gray level is calculated using the following formula,
wherein, the datatargetData voltage representing the target gray scale, i.e. target data voltage, dataiA first data voltage, data, corresponding to a first endpoint gray scale of a binding point gray scale interval to which the target gray scale belongs under the second display brightness level instructioni+1A second data voltage, Gray, corresponding to a second endpoint Gray scale of the binding Gray scale interval to which the target Gray scale belongs under the second display brightness level instructioniRepresenting a first endpoint Gray level, Gray, of the binding Gray level intervali+1Representing a second endpoint gray level of the binding gray level interval, wherein the second endpoint gray level is greater than the first endpoint gray level.
Step 132, determining the data voltage corresponding to the target gray scale as a target data voltage corresponding to the target brightness under a preset display brightness level instruction;
still taking the case shown in table 1 as an example, the target brightness (450nit) corresponding to the preset Gray level (255) under the preset brightness adjustment instruction corresponds to the target Gray level (223.74) under the second display brightness level instruction, and the target Gray level Gray istarget223.74 Gray level is located in the binding region 220-]Wherein the 220 Gray level can correspond to the first endpoint Gray level of the binding Gray leveli255 Gray level corresponding to the second endpoint Gray level of the binding Gray leveli+1Then, the data voltage corresponding to the target gray scale can be obtained according to the data voltage corresponding to the first end point gray scale 220 and the data voltage corresponding to the second end point gray scale 255, where the data voltage is the data voltage corresponding to the target brightness (corresponding to the preset gray scale) under the preset display brightness level command, that is, the data voltage corresponding to the preset gray scale under the preset display brightness level commandThe target data voltage. The target data voltage corresponding to the target brightness under the preset display brightness level instruction in the data voltage dimming interval is calculated through the formula calculation mode, and finally a group of gamma voltages under the preset display brightness level instruction are obtained.
Fig. 4 is a curve of correspondence between Gray levels and luminances under a second display luminance level instruction within a data voltage adjustment interval according to an embodiment of the present invention, and fig. 5 is a curve of correspondence between Gray levels and luminances under a preset display luminance level instruction according to an embodiment of the present invention, wherein an abscissa Gray represents a Gray level and an ordinate L v represents a luminance in fig. 4 and 5, fig. 4 exemplarily shows a case where the display luminance of the second digital luminance instruction corresponding to a maximum Gray level is 600nit and the display luminance of the preset digital luminance instruction corresponding to the maximum Gray level is 450nit, where a curve 10 shown in fig. 4 can be obtained by gamma adjustment, and a curve 20 shown in fig. 5 can be obtained by calculation according to a curve 10 shown in fig. 4 and the above-mentioned gamma voltage adjustment method without gamma adjustment.
Fig. 6 is a curve showing the correspondence relationship between different Gray levels of the red, green, and blue subpixels and the data voltage under the second display luminance level command in the data voltage adjustment interval, for example, the display luminance of the maximum Gray level corresponding to the second display luminance level command is 600nit, where the abscissa Gray represents the Gray level, and the ordinate data represents the data voltage, where in fig. 6, the curve 11 may correspond to the correspondence relationship between the Gray level and the data voltage of the green subpixel, the curve 12 may correspond to the correspondence relationship between the Gray level and the data voltage of the red subpixel, and the curve 13 may correspond to the correspondence relationship between the Gray level and the data voltage of the blue subpixel. As can be seen from fig. 6, the data voltages of the sub-pixels with different colors under the same gray scale may be different, and the gamma adjustment method provided in this embodiment is applicable to any sub-pixel with any color in the display panel, for example, when the display panel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, the gamma adjustment method provided in this embodiment may be applied to the red sub-pixel, the green sub-pixel, and the blue sub-pixel respectively to perform the gamma adjustment, taking the red sub-pixel as an example, the target data voltage corresponding to the target brightness under the preset display brightness level command may be calculated according to the following formula,
wherein, the datatarget-RData representing the red sub-pixel data voltage corresponding to the target gray leveli-RThe first data voltage, data, of the red sub-pixel corresponding to the first endpoint (i.e. binding) gray scale of the binding gray scale interval to which the target gray scale belongs under the second display brightness level instructioni+1-RA second data voltage of the red sub-pixel corresponding to a second end point (i.e. binding) gray scale of a binding gray scale interval to which the target gray scale belongs under a second display brightness level instruction is represented, wherein the datai-RAnd datai+1-RCan be known in advance (obtained by performing gamma debugging under the second display brightness level instruction), and then the target data voltage corresponding to the target brightness of the red sub-pixel can be determined. The calculation method of the target data voltages of the green sub-pixel and the blue sub-pixel is the same as that of the red sub-pixel, and is not repeated herein.
As can be seen from the above analysis, in the gamma adjustment method for the display panel provided in this embodiment, in the data voltage dimming interval, only the gamma adjustment is performed under the maximum display brightness level command (the second display brightness level command) of the data voltage dimming interval to obtain a set of gamma voltages, a set of gamma voltages corresponding to the preset display brightness level command in the same data voltage dimming interval can be obtained by calculation according to the set of gamma voltages under the second display brightness level command, wherein the preset display brightness level instruction belongs to the data voltage dimming interval and is smaller than the second display brightness level instruction, that is, the gamma adjusting method for the display panel provided in this embodiment can obtain a set of gamma voltages corresponding to any display brightness level command in the same data voltage dimming interval by calculation according to a set of gamma voltages under the second display brightness level command. Compared with the existing gamma adjustment method for the display panel, the gamma adjustment method for the display panel at least needs to be carried out in a mode of respectively carrying out gamma adjustment on the display panel under the display brightness level instructions corresponding to the two endpoints of the data voltage dimming interval, so that the time for gamma adjustment can be reduced, correspondingly, the burning time of gamma voltage is reduced, and the production line capacity is further improved.
It should be noted that, in any embodiment of the present invention, the gamma voltage is a data voltage.
In the gamma voltage adjusting method for the display panel provided by the embodiment, target brightness respectively corresponding to a plurality of preset gray scales under a preset display brightness level instruction is obtained; determining a target gray scale corresponding to the target brightness under the second display brightness level instruction according to the preset corresponding relation between the target brightness and the target gray scale; and determining a data voltage corresponding to the target gray scale in a binding point gray scale interval to which the target gray scale belongs under a second display brightness level instruction, determining the data voltage corresponding to the target gray scale as a target data voltage corresponding to the target brightness under a preset display brightness level instruction, and further determining a group of gamma voltages under any preset display brightness level instruction in the data voltage dimming interval according to a group of gamma voltages under a maximum display brightness level instruction in the data voltage dimming interval through calculation, namely within one data voltage dimming interval, only performing gamma debugging under the maximum display brightness level instruction to obtain a group of gamma voltages under the maximum display brightness level instruction, so that the time of gamma debugging and gamma voltage burning can be reduced, and the production line capacity is improved.
Fig. 7 is a flowchart of another gamma adjustment method for a display panel according to an embodiment of the present invention, and referring to fig. 7, the gamma adjustment method for a display panel includes:
and step 210, performing gamma debugging on the display panel under the second display brightness level instruction to obtain data voltage corresponding to the binding gray scale under the second display brightness level instruction.
Specifically, in this step, the existing method for performing gamma debugging on the display panel may be adopted, the data voltage is adjusted under the second display brightness level instruction, the display brightness of the display panel is obtained in real time, when the display brightness reaches the target brightness corresponding to the binding point gray scale, the data voltage at this time is determined as the data voltage corresponding to the binding point gray scale, and the data voltage corresponding to each binding point gray scale is obtained by this way, so as to obtain a group of gamma voltages finally.
Continuing to refer to fig. 2, a first data voltage dimming interval and a second data voltage dimming interval are included between the minimum value of the display brightness level instruction of the display panel and the maximum value of the display brightness level instruction, and the second display brightness level instruction corresponding to the endpoint value of the second data voltage dimming interval is the maximum display brightness level instruction; and further comprising a light emission control signal pulse dimming interval between the first data voltage dimming interval and the second data voltage dimming interval;
in the data voltage dimming interval, the display brightness is adjusted only by adjusting the data voltage; in the data voltage dimming interval, the width of the light emission control signal pulse supplied to the pixel circuit in the display panel is always constant, that is, the duty ratio of the high level (or the low level) of the light emission control signal is fixed.
The light-emitting control signal pulse dimming interval at least adjusts the display brightness by adjusting the width of the light-emitting control signal pulse signal.
Wherein the first data voltage dimming interval is a display corresponding to the O pointThe brightness level command is a display brightness level command corresponding to the point A, which is abbreviated as DBVO-DBVG]Wherein DBVOThe first data voltage dimming interval is also commonly referred to as An Off Display (AOD) interval for a minimum Display brightness level command of the Display panel. The second data voltage dimming interval is from the display brightness level command corresponding to the point C to the display brightness level command corresponding to the point A, which is abbreviated as DBVC-DBVA]Wherein DBVAA maximum display brightness level command for the display panel. Optionally, the refresh frequencies corresponding to the first data voltage dimming interval and the second data voltage dimming interval are different, specifically, the difference in refresh frequencies may be expressed as a difference in frequencies at which the scanning circuit of the display panel outputs the scanning signal to the scanning line, for example, the refresh frequency in the first data voltage dimming interval is 30Hz, and the refresh frequency in the second data voltage dimming interval is 60 Hz. For a first data voltage dimming interval and a second data voltage dimming interval with different refreshing frequencies, gamma debugging is required to be performed under a second display brightness level instruction of the first data voltage dimming interval respectively to obtain a group of gamma voltages under the second display brightness level instruction of the first data voltage dimming interval and a group of gamma voltages under the second display brightness level instruction of the second data voltage dimming interval, and then the gamma voltages under the preset display brightness level instruction in the first data voltage dimming interval can be determined according to the group of gamma voltages under the second display brightness level instruction of the first data voltage dimming interval; and determining the gamma voltage under the preset display brightness level instruction in the second data voltage dimming interval according to a group of gamma voltages under the second display brightness level instruction in the second data voltage dimming interval.
With reference to fig. 2, a light-emitting control signal pulse dimming interval is further included between the first data voltage dimming interval and the second data voltage dimming interval, and the light-emitting control signal pulse dimming interval is from a display brightness level command corresponding to F point to a display brightness level command corresponding to C point, which is abbreviated as [ DBV ] hereinafterF-DBVC]Optionally, the display brightness level instruction corresponding to F point and the display brightness level instruction corresponding to G pointThe difference of the display brightness level command may be 1. The gamma adjustment is performed in the light emission control signal pulse dimming interval according to a plurality of different display brightness level commands, and the display brightness is adjusted at least according to the light emission control signal pulse dimming interval, that is, the display brightness is not adjusted only by adjusting the data voltage in the light emission control signal pulse dimming interval, so that the gamma adjustment method provided by the embodiment of the invention is not applicable to the light emission control signal pulse dimming interval.
With reference to fig. 2, optionally, the second data voltage dimming interval is divided into at least two continuous sub-intervals, and the second data voltage dimming interval includes a first boundary display brightness level instruction corresponding to a boundary point of the sub-interval and a second boundary display brightness level instruction corresponding to a boundary point of the second data voltage dimming interval and the light-emitting control signal pulse dimming interval; the preset display brightness level instruction in the second data voltage dimming interval comprises a first boundary display brightness level instruction and a second boundary display brightness level instruction.
Referring to fig. 2, optionally, the second data voltage dimming interval may be divided into a first sub-interval and a second sub-interval, where the first sub-interval is from the display brightness level command corresponding to the point C to the display brightness level command corresponding to the point B, which is hereinafter abbreviated as [ DBV ]C-DBVB]This first sub-interval is also commonly referred to as a High Brightness Mode (HBM) interval; the first sub-interval is from the display brightness level command corresponding to the point B to the display brightness level command corresponding to the point A, which is abbreviated as DBVB-DBVA]This second sub-interval is also commonly referred to as the conventional data voltage dimming interval. And for the condition that the second data voltage dimming interval can be divided into a first sub-interval and a second sub-interval, the first boundary display brightness level instruction is the display brightness level instruction corresponding to the point B, and the second boundary display brightness level instruction is the display brightness level instruction corresponding to the point C.
In the prior art, gamma debugging is usually performed under a first boundary display brightness level instruction and a second boundary display brightness level instruction respectively to obtain a set of gamma voltages corresponding to the first boundary display brightness level instruction and a set of gamma voltages corresponding to the second boundary display brightness level instruction, but in this embodiment, by setting a preset display brightness level instruction in a second data voltage dimming interval to include the first boundary display brightness level instruction and the second boundary display brightness level instruction, a set of gamma voltages under the first boundary display brightness level instruction and a set of gamma voltages under the second boundary display brightness level instruction in the second data voltage dimming interval can be determined by calculation according to a set of gamma voltages under a maximum display brightness level instruction (second display brightness level instruction) in the second data voltage dimming interval, and then need not to carry out gamma debugging under first demarcation display brightness level instruction and the second demarcation display brightness level instruction, and then reduce gamma regulation time, improve and produce the line productivity. In addition, by setting the preset display brightness level instruction in the second data voltage dimming interval to comprise the first boundary display brightness level instruction and the second boundary display brightness level instruction, a group of gamma voltages under the first boundary display brightness level instruction and a group of gamma voltages under the second boundary display brightness level instruction can be determined through calculation, so that the gamma adjusting time can be reduced, meanwhile, a plurality of groups of gamma voltages can be obtained, and the image quality of the display panel is ensured to be good.
On the basis of the above technical solutions, optionally, the preset gray scale under the preset display brightness level instruction is equal to the binding gray scale under the second display brightness level instruction.
Specifically, the setting of the binding gray scale phase under the second display brightness level instruction is generally distributed in the whole gray scale range, the preset gray scale under the preset display brightness level instruction is equal to the binding gray scale under the second display brightness level instruction, the preset gray scale under the preset display brightness level instruction can be ensured to be respectively in the whole gray scale range, and the accuracy of data voltages corresponding to other gray scales except the preset gray scale, which are obtained by performing interpolation calculation on a group of gamma voltages obtained according to the preset display brightness level instruction, can be further ensured.
The embodiment of the present invention further provides a gamma adjusting device for a display panel, where the gamma adjusting device is configured to execute the gamma adjusting method for a display panel provided in any of the above embodiments of the present invention, and at least one data voltage dimming interval is included between a minimum value of a display brightness level command and a maximum value of the display brightness level command of the display panel, two end point values of the data voltage dimming interval are a first display brightness level command and a second display brightness level command respectively, and the second display brightness level command is greater than the first display brightness level command;
fig. 8 is a schematic structural diagram of a gamma adjustment apparatus for a display panel according to an embodiment of the present invention, and referring to fig. 8, the gamma adjustment apparatus for a display panel includes:
a target brightness obtaining module 310, configured to obtain target brightness corresponding to each of a plurality of preset gray scales under a preset display brightness level instruction;
the target gray scale determining module 320 is configured to determine a target gray scale corresponding to the target brightness under the second display brightness level instruction according to a preset corresponding relationship between the target brightness and the target gray scale;
the target data voltage determining module 330 is configured to determine a target data voltage corresponding to the target brightness under the preset display brightness level instruction according to the binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction;
the preset display brightness level instruction belongs to the data voltage dimming interval, and the preset display brightness level instruction is smaller than the second display brightness level instruction.
In the gamma voltage adjusting device for a display panel provided by this embodiment, target brightness corresponding to a plurality of preset gray scales under a preset display brightness level instruction is obtained by a target brightness obtaining module; the target gray scale determining module determines a target gray scale corresponding to the target brightness under the second display brightness level instruction according to the preset corresponding relation between the target brightness and the target gray scale; the target data voltage determining module determines a target data voltage corresponding to the target brightness under the preset display brightness level instruction according to the binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction, and then can determine a group of gamma voltages under any preset display brightness level instruction in the data voltage dimming interval through calculation according to a group of gamma voltages under the maximum display brightness level instruction in the data voltage dimming interval, namely in a data voltage dimming interval, only gamma debugging is needed under the maximum display brightness level instruction to obtain a group of gamma voltages under the maximum display brightness level instruction, so that the time of gamma debugging and gamma voltage burning can be reduced, and the production line capacity is improved.
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. The gamma adjustment method for the display panel is characterized in that at least one data voltage dimming interval is included between the minimum value of a display brightness level instruction and the maximum value of the display brightness level instruction of the display panel, two endpoint values of the data voltage dimming interval are a first display brightness level instruction and a second display brightness level instruction respectively, and the second display brightness level instruction is larger than the first display brightness level instruction;
the display panel gamma adjusting method includes:
acquiring target brightness corresponding to a plurality of preset gray scales under a preset display brightness level instruction;
determining the target gray scale corresponding to the target brightness under the second display brightness level instruction according to the preset corresponding relation between the target brightness and the target gray scale;
determining a target data voltage corresponding to the target brightness under the preset display brightness level instruction according to the binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction;
the preset display brightness level instruction belongs to the data voltage dimming interval, and the preset display brightness level instruction is smaller than the second display brightness level instruction.
2. The gamma adjustment method for a display panel of claim 1, wherein a first data voltage dimming interval and a second data voltage dimming interval are included between a minimum value of the display brightness level command and a maximum value of the display brightness level command of the display panel, and a second display brightness level command corresponding to an endpoint value of the second data voltage dimming interval is the maximum display brightness level command; and further comprising a light emission control signal pulse dimming interval between the first data voltage dimming interval and the second data voltage dimming interval;
in the data voltage dimming interval, the display brightness is adjusted only by adjusting the data voltage;
the light-emitting control signal pulse dimming interval at least adjusts the display brightness by adjusting the light-emitting control signal pulse signal width.
3. The gamma adjustment method for a display panel according to claim 2, wherein the second data voltage dimming interval is divided into at least two consecutive sub-intervals, and the second data voltage dimming interval comprises a first boundary display brightness level command corresponding to a boundary point of the sub-interval and a second boundary display brightness level command corresponding to a boundary point of the second data voltage dimming interval and the light emission control signal pulse dimming interval; the preset display brightness level instruction in the second data voltage dimming interval comprises the first boundary display brightness level instruction and the second boundary display brightness level instruction.
4. The gamma adjustment method for a display panel according to claim 2, wherein the refresh frequency of the first data voltage dimming interval is different from the refresh frequency of the second data voltage dimming interval.
5. The gamma adjustment method of claim 1, wherein determining the target gray scale corresponding to the target brightness under the second display brightness level command according to the preset correspondence between the target brightness and the target gray scale comprises:
and determining the target gray scale corresponding to the target brightness under the second display brightness level instruction according to the target brightness, the maximum gray scale under the second display brightness level instruction, and the preset corresponding relation between the display brightness corresponding to the maximum gray scale under the second display brightness level instruction and the target gray scale.
6. The gamma adjustment method for a display panel according to claim 5, wherein the preset relationship between the target brightness, the maximum gray scale instructed by the second display brightness level, and the display brightness corresponding to the maximum gray scale instructed by the second display brightness level and the target gray scale is as follows:
Graytarget＝β*Graytuning-Gmaxwherein
Wherein, GraytargetRepresenting said target Gray level, Graytuning-GmaxL v representing the maximum gray level under the second display brightness level commandtargetRepresenting the target brightness, L vtuning-GmaxAnd displaying the display brightness corresponding to the maximum gray scale under the second display brightness level instruction.
7. The method for gamma adjustment of a display panel according to claim 1, wherein the determining a target data voltage corresponding to the target brightness under the preset display brightness level command according to the binding point gray scale interval to which the target gray scale belongs under the second display brightness level command comprises:
determining a data voltage corresponding to the target gray scale according to a data voltage corresponding to an endpoint gray scale of a binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction;
determining the data voltage corresponding to the target gray scale as a target data voltage corresponding to the target brightness under the preset display brightness level instruction;
preferably, the data voltage corresponding to the target gray scale is calculated using the following formula,
wherein, the datatargetData voltage representing the target gray scale, i.e. the target data voltage, dataiA first data voltage corresponding to a first endpoint gray scale of a binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction, wherein the data voltage is a data voltagei+1A second data voltage, Gray, corresponding to a second endpoint Gray scale of the binding Gray scale interval to which the target Gray scale belongs under the second display brightness level instructioniRepresenting a first endpoint Gray level, Gray, of the binding Gray level intervali+1Representing a second endpoint gray scale of the binding gray scale interval, wherein the second endpoint gray scale is greater than the first endpoint gray scale.
8. The method as claimed in claim 1, wherein the predetermined gray level under the predetermined display brightness level command is equal to the binding gray level under the second display brightness level command.
9. The gamma adjustment method for display panel according to claim 1, further comprising, before the obtaining of the preset display brightness level command and the plurality of target brightness under the preset display brightness level command:
and under the second display brightness level instruction, carrying out gamma debugging on the display panel to obtain the data voltage corresponding to the binding gray scale under the second display brightness level instruction.
10. A gamma adjusting device of a display panel, wherein the gamma adjusting device is configured to perform the gamma adjusting method of the display panel according to any one of claims 1 to 9, and the display panel includes at least one data voltage dimming interval between a minimum value of a display brightness level command and a maximum value of the display brightness level command, two end values of the data voltage dimming interval are a first display brightness level command and a second display brightness level command, respectively, and the second display brightness level command is greater than the first display brightness level command;
the display panel gamma adjusting apparatus includes:
the target brightness acquisition module is used for acquiring target brightness corresponding to a plurality of preset gray scales under a preset display brightness level instruction;
the target gray scale determining module is used for determining the target gray scale corresponding to the target brightness under the second display brightness level instruction according to the preset corresponding relation between the target brightness and the target gray scale;
a target data voltage determining module, configured to determine, according to a binding point gray scale interval to which the target gray scale belongs under the second display brightness level instruction, a target data voltage corresponding to the target brightness under the preset display brightness level instruction;
the preset display brightness level instruction belongs to the data voltage dimming interval, and the preset display brightness level instruction is smaller than the second display brightness level instruction.
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