CN114267278B - Display driving method and display driving module - Google Patents
Display driving method and display driving module Download PDFInfo
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- CN114267278B CN114267278B CN202111543703.5A CN202111543703A CN114267278B CN 114267278 B CN114267278 B CN 114267278B CN 202111543703 A CN202111543703 A CN 202111543703A CN 114267278 B CN114267278 B CN 114267278B
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Abstract
The application relates to a driving method of a display and a driving module of the display, wherein the method comprises the following steps: acquiring a first critical voltage input to a display; determining a first critical current corresponding to the first critical voltage according to the first critical voltage; determining a second critical current of the display based on the first critical current; determining a second critical voltage corresponding to the second critical current according to the second critical current; correcting the gamma curve of the display according to the second critical voltage to obtain a corrected gamma curve; and driving the picture to display based on the corrected gamma curve. According to the method and the device, the second critical current of the display is determined based on the first critical current, then the second critical voltage corresponding to the second critical current is determined according to the second critical current, voltage adjustment and transition gray-scale current can be combined, gamma curve approach correction to the Gamma2.2 curve is achieved, power consumption of the display is reduced, and accuracy of color cast phenomenon in low gray scale is improved.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a driving method of a display and a driving module of the display.
Background
In the current liquid crystal display field, continuous development and progress of display technologies such as an LED display and an AMOLED display bring about increasingly abundant display products. In the daily application process, the LED display has color cast phenomenon when displaying a low gray-scale picture, so that the human eye visual experience is reduced.
PWM driving or PAM driving is used in the related art to improve the color shift phenomenon. However, when PWM (Pulse Width Modulation, i.e., pulse width modulation) driving is employed, although the low gray scale color shift phenomenon is improved, the display luminance is reduced at the same time, so that the power consumption is reduced; when PAM (Pulse Amplitude Modulation, i.e., pulse amplitude modulation) driving is used, although display brightness is not lost, a color shift phenomenon occurs at low gray scales. Accordingly, a scheme for improving low gray level color shift and minimizing brightness loss in a PWM and PAM hybrid driving manner has been developed in the related art.
However, in the related art, the voltage provided by the PWM and PAM hybrid driving when displaying the low gray-scale image is unique, and most of the transition modes are divided by using voltage conversion as the gray-scale image, so that the ideal gray-scale transition effect is not good, and compared with the linear Gamma, the brightness difference of Gamma 2.2 is larger, so that the viewing effect is affected.
Fig. 1 shows a schematic diagram of PWM and PAM hybrid driving in the related art.
As shown in fig. 1, PWM and PAM hybrid driving is employed in the related art. One frame in fig. 1 is divided into 10 subframes in total. Wherein the PAM display area is scattered and evenly distributed to be inserted after each sub-frame of the PWM.
Fig. 2 is a schematic diagram showing a corresponding relationship between gray scale and voltage in the related art.
As shown in fig. 2, the related art has 0 to 31 gray scales driven by PWM and 32 to 255 gray scales driven by PAM. When the gray level is 31, the PWM first subframe, the PWM second subframe, the PWM third subframe, the PWM fourth subframe and the PWM fifth subframe in fig. 1 operate simultaneously, and the operating time is t/16+t/8+t/4+t/2+t = (31/16) t; when the gray level is 32, the PAM subframes in fig. 1 all operate for 5t.
Referring to fig. 2, 32 gray scales indicated by black circles in the figure are transition regions of a PWM driving mode and a PAM driving mode, and are controlled by current, so as to realize gray scale segmentation. For example, in fig. 2, the voltage of the gray level 31 is 5Vdata, and the brightness corresponding to the gray level 31 is approximately equal to 5Vdata (31/16) t; the voltage of 32 gray scale is Vdata, and the brightness of 31 gray scale is approximately Vdata (5) t.
However, the schemes of fig. 1 and 2 reduce the color shift phenomenon at the time of low gray scale, but the gray scale transition is performed by using the proportional relationship between brightness and voltage due to the influence of the characteristics of the TFT device, so that the error is large; meanwhile, the difference between the gray level 31 and the gray level 32 is not accurately represented by the (5/16) Vdata voltage, and the gamma2.2 curve can be fluctuated during calibration.
Disclosure of Invention
In view of this, the present application provides a driving method of a display and a driving module of a display, which can combine voltage adjustment with current of transition gray scale, so as to implement the gamma curve approach correction to the gamma2.2 curve, thereby reducing power consumption of the display and improving accuracy of color cast phenomenon when low gray scale is improved.
According to an aspect of the present application, there is provided a driving method of a display, the driving method of the display including: acquiring a first critical voltage input to the display; determining a first critical current corresponding to the first critical voltage according to the first critical voltage; determining a second critical current of the display based on the first critical current; determining a second critical voltage corresponding to the second critical current according to the second critical current; correcting the gamma curve of the display according to the second critical voltage to obtain a corrected gamma curve; and driving a picture to display based on the corrected gamma curve.
According to another aspect of the present application, there is provided a driving module of a display, the driving module including: the first critical voltage acquisition module is electrically connected with the first critical current acquisition module and is used for acquiring a first critical voltage input to the display; the first critical current acquisition module is electrically connected with the first critical voltage acquisition module and the second critical current acquisition module and is used for determining a first critical current corresponding to the first critical voltage according to the first critical voltage; the second critical current acquisition module is electrically connected with the first critical current acquisition module and the second critical voltage acquisition module and is used for determining a second critical current of the display based on the first critical current; the second critical voltage acquisition module is electrically connected with the second critical current acquisition module and the gamma curve correction module and is used for determining a second critical voltage corresponding to the second critical current according to the second critical current; the gamma curve correction module is electrically connected with the second critical voltage acquisition module and the display module and is used for correcting the gamma curve of the display according to the second critical voltage to obtain a corrected gamma curve; and the display module is electrically connected with the gamma curve correction module and is used for driving the picture to display based on the corrected gamma curve.
According to the method, voltage adjustment and transition gray level current can be combined according to aspects of the application, gamma curve approximation correction to gamma2.2 curve is achieved, power consumption of a display is further reduced, and accuracy of color cast phenomenon when low gray level is improved.
Drawings
Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of PWM and PAM hybrid driving in the related art.
Fig. 2 is a schematic diagram showing gray scale and voltage correspondence in the related art.
Fig. 3 shows a flowchart of a driving method of a display according to an embodiment of the present application.
Fig. 4 shows a schematic diagram of low gray scale interval division according to an embodiment of the present application.
Fig. 5 shows a schematic diagram of low gray scale interval division according to an embodiment of the present application.
Fig. 6 shows a schematic diagram of PWM and PAM hybrid driving according to an embodiment of the present application.
Fig. 7 is a schematic diagram showing a driving method of a display according to an embodiment of the present application.
Fig. 8 shows a schematic structural diagram of a driving module according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials. In some instances, methods, means, elements, and circuits have not been described in detail as not to unnecessarily obscure the present application.
The application mainly provides a driving method of a display, which comprises the following steps: acquiring a first critical voltage input to the display; determining a first critical current corresponding to the first critical voltage according to the first critical voltage; determining a second critical current of the display based on the first critical current; determining a second critical voltage corresponding to the second critical current according to the second critical current; correcting the gamma curve of the display according to the second critical voltage to obtain a corrected gamma curve; and driving a picture to display based on the corrected gamma curve.
The gamma curve approach correction to the Gamma2.2 curve is realized by combining voltage adjustment and transition gray level current, so that the power consumption of the display is reduced, and the accuracy of the color cast phenomenon in low gray level is improved.
Fig. 3 shows a flowchart of a driving method of a display according to an embodiment of the present application.
As shown in fig. 3, the driving method of the display according to the embodiment of the application includes:
step S1: acquiring a first critical voltage input to the display;
the driving modes of the display can comprise a first driving mode and a second driving mode. The first driving method may be a PWM driving method, and the second driving method may be a PAM driving method. That is, the display according to the embodiment of the present application may drive the display screen to display by using the PWM driving method and the hybrid driving formed by the PAM driving method. It will be appreciated that other driving modes may be provided in the embodiments of the present application, and the number and types of the driving modes are not limited in this application.
Further, the first threshold voltage of the display may be a threshold voltage corresponding to the first driving mode in a transition process from the first driving mode to the second driving mode. For example, the first threshold voltage may be a threshold voltage during the PWM driving mode, and the display may start to transition to the PAM driving mode for processing after the first threshold voltage is processed.
Further, obtaining a first threshold voltage input to the display includes:
step S11: acquiring critical gray scale of the display;
step S12: and determining a first critical voltage corresponding to the critical gray scale.
The critical gray scale of the display may be a critical gray scale corresponding to the first driving mode in a transition process from the first driving mode to the second driving mode. A mapping relationship exists between the critical gray level of the display and the first critical voltage.
For example, the gray levels of the display can be represented by 8 bits, respectively 0 to 255 gray levels, 256 (2 8 ) And gray levels. Each gray level may represent a corresponding brightness level. For example, the gray level 31 may be a critical gray level, and the voltage corresponding to the gray level 31 may be the first critical voltage.
Further, obtaining the critical gray scale of the display includes:
step S111: acquiring a range of gray scales to be displayed of the display;
step S112: dividing the range of gray scales to be displayed into a low gray scale range and a high gray scale range according to the driving mode of the display, wherein the low gray scale range corresponds to a first driving mode of the display, and the high gray scale range corresponds to a second driving mode of the display;
Step S113: and determining the maximum gray level in the low gray level range as the critical gray level.
The range of the gray scale to be displayed may be a target gray scale range displayed by the display. For example, the range of gray scales to be displayed of the display may be 0 to 255 gray scales. It is noted that for a frame of a fixed image, the gray scale of the image is not necessarily in the range of 0 to 255 gray scales, but may be in the range of similar 64 to 128 gray scales. In practical application, the range of the gray scale to be displayed can be dynamically adjusted according to the requirement.
Further, the range of gray levels to be displayed may be divided into a low gray level range and a high gray level range according to the driving mode of the display. For example, the range of gray scales to be displayed of the display may be 0 to 255 gray scales. The 0 to 31 gray scales may be divided into a low gray scale range and the 32 to 255 gray scales may be divided into a high gray scale range. In the low gray scale range, the display can display in a first driving mode; in the high gray scale range, the display can display in a second driving mode.
Further, a maximum gray level in the low gray level range is determined as the critical gray level. Taking the low gray scale range of 0 to 31 gray scales as an example, the gray scale 31 may be determined as the critical gray scale. It can be understood that the present application is not limited to how to divide the range of the gray levels to be displayed and how to determine the critical gray levels.
Further, determining a first threshold voltage corresponding to the critical gray scale includes:
step S121: dividing the low gray scale range into a plurality of low gray scale intervals;
step S122: dividing the driving voltage of the first driving mode according to the plurality of low gray scale intervals to obtain a plurality of first voltages, wherein each low gray scale interval corresponds to one first voltage;
step S123: and determining a first voltage corresponding to the critical gray scale as the first critical voltage.
Wherein, there is a mapping relationship between the plurality of low gray scale intervals and the first voltage. For example, in any one of the low gray scale intervals, the first voltages corresponding to the low gray scale intervals may be the same. The lengths of the respective low gray scale sections in the plurality of low gray scale sections may be the same or different. It is understood that the present application is not limited to how the plurality of low gray scale intervals and the driving voltage are divided.
Compared with the related art, the Gamma curve of the embodiment of the present application has higher fineness when the gray scale is low, and further, the brightness difference between adjacent gray scales of the low gray scale is smaller, so that the color cast phenomenon when the gray scale is low can be further improved. In addition, the gradual reduction of the voltage at low gray level avoids abrupt Gamma2.2 curve data caused by a driving mode, improves the display effect of hybrid driving, and further leads the specification of a display picture to be more standard.
Fig. 4 shows a schematic diagram of low gray scale interval division according to an embodiment of the present application.
As shown in fig. 4, the low gray scale range may be divided into n low gray scale sections, and the plurality of low gray scale sections may be gray1-gray2,..gray (n-2) -gray (n-1), gray (n-1) -gray (n). The driving voltage of the first driving mode may be divided into n parts correspondingly.
Illustratively, in connection with FIG. 4, the above-described partitioning process can be expressed as follows by equation (1):
wherein Vdata may represent the driving voltage of the first driving mode, and 2Vn may be a voltage corresponding to gray1-gray2, 2V n -1-2V n Can be voltage corresponding to gray2-gray3, and so on, 2V 1 -2V 2 The voltage may be a voltage corresponding to gray (n-1) -gray (n). n may be a natural number.
Note that, in the formula (1), gray1 and gray (n) are exemplary between 1 and 31. For example, the gray (n) may be set to 63. The present application is not limited to the gradation division in the formula (1).
Referring to fig. 4, for example, the driving voltage of the first driving method may be divided into n parts below 32 gray scales with a low gray scale range of 0 to 31 gray scales. The first gamma straight line can be determined according to the coordinate origin and the coordinate point corresponding to the gray1, the second gamma straight line can be determined according to the coordinate point corresponding to the gray1 and the coordinate point corresponding to the gray2, and the n-th gamma straight line can be determined according to the coordinate point corresponding to the gray (n-1) and the coordinate point corresponding to the gray (n) by analogy. And above 32 gray levels, a normal Gamma2.2 curve can be set. Of course, other types of Gamma curves may be set above 32 gray levels as needed, and the present application is not limited thereto.
By subdividing the driving voltage of the first driving mode corresponding to the low gray scale range, the embodiment of the application can realize the gamma curve gamma2.2 curve approximation correction, further reduce the power consumption of the display and improve the accuracy of the color cast phenomenon during low gray scale.
Fig. 5 shows a schematic diagram of low gray scale interval division according to an embodiment of the present application.
As shown in fig. 5, the low gray scale range may be divided into a first low gray scale section 0-15 and a second low gray scale section 16-31, taking halving the low gray scale range as an example. At this time, the voltage corresponding to the first low gray level region may be 2V 2 The voltage corresponding to the second low gray level region may be 2V 1 -2V 2 . This process can be expressed as the following equation (2):
wherein, formula (2) may be a special case of formula (1). At this time, the gray (n) may be 31.
Further, determining a first voltage corresponding to the critical gray scale as the first critical voltage includes:
step S1231: determining a first voltage corresponding to a low gray scale interval with the lowest order in the plurality of low gray scale intervals;
step S1232: determining a first voltage corresponding to a low gray scale interval adjacent to the low gray scale interval with the lowest order according to the first voltage, and analogizing until the determined first voltage corresponds to the critical gray scale;
Step S1233: and taking the first voltage corresponding to the critical gray scale as the first critical voltage.
For example, in fig. 4, the low gray scale section with the lowest order among the plurality of low gray scale sections may be a section from the origin of coordinates to gray 1. The first voltage corresponding to the low gray level interval with the lowest order is 2Vn. As can be seen from the formula (1), the low gray scale interval adjacent to the low gray scale interval with the lowest gray scale is gray1-gray2, and the first voltage corresponding to gray1-gray2 is 2V n -1-2V n . The first voltages corresponding to the gray1-gray2 and the first voltages corresponding to the low gray level intervals with the lowest orders have relevance, that is, the first voltages corresponding to the gray1-gray2 can be calculated according to the first voltages corresponding to the low gray level intervals with the lowest orders. Similarly, as the number of gray scales in the low gray scale range increases, the first voltage corresponding to the next low gray scale interval can be calculated by using the first voltage corresponding to the previous low gray scale interval. The first voltage corresponding to the critical gray scale can be obtained through step-by-step calculation, and the first voltage corresponding to the critical gray scale is used as the first critical voltage.
In fig. 4 or 5, the light emission ratio of the first driving method to the second driving method may be 1:1. It is understood that in practical applications, the light emitting ratio of the first driving mode to the second driving mode may be configured according to actual needs, which is not limited in this application.
Step S2: determining a first critical current corresponding to the first critical voltage according to the first critical voltage;
specifically, in the embodiment of the present application, the overall current of the display may be measured first, and then the first critical current corresponding to the first critical voltage may be calculated according to the first critical voltage. For example, taking the critical gray level of 31 as an example, the first critical current corresponding to the gray level of 31 may be calculated. It is understood that the determination of the first critical current corresponding to the first critical voltage may be performed in a variety of ways, and is not limited in this application.
Step S3: determining a second critical current of the display based on the first critical current;
further, determining a second critical current of the display based on the first critical current includes:
step S31: acquiring the number of subframes of the first driving mode;
step S32: and determining a second critical current of the display according to the first critical current and the number of subframes of the first driving mode.
Fig. 6 shows a schematic diagram of PWM and PAM hybrid driving according to an embodiment of the present application.
As shown in fig. 6, the subframes of the first driving method may include a PWM first subframe, a PWM second subframe, a PWM third subframe, a PWM fourth subframe, and a PWM fifth subframe. The number of subframes of the first driving manner may be 5. The time length of each PWM subframe may be equal. The subframes of the second driving method may include 5 PAM subframes, and the entire time of each PAM subframe may be used for display light emission.
Further, a second critical current of the display is determined according to the first critical current and the number of subframes of the first driving mode. For example, the first critical current may be denoted by I1, and the number of subframes in the first driving mode may be 5, and in this case, the second critical current of the display may be I1/5, that is, the first critical current is divided by the number of subframes in the first driving mode, so as to obtain the second critical current I2.
Further, the second critical current may be an actual display current corresponding to a gray scale higher than the critical gray scale and adjacent to the critical gray scale in the low gray scale range. For example, the critical gray scale may be 31, and the second critical current may be the actual display current corresponding to the gray scale 32, corresponding to the first critical current.
The current after the critical gray level is selected by utilizing the current corresponding to the voltage before the critical gray level, and the voltage after the critical gray level is adjusted by the current after the critical gray level, so that the gray level transition is completed.
Further, acquiring the number of subframes of the first driving mode includes:
step S311: dividing a frame of the display according to the first driving mode and the second driving mode to obtain at least one first subframe and at least one second subframe, wherein the at least one first subframe corresponds to the first driving mode, and the at least one second subframe corresponds to the second driving mode;
step S312: and determining the number of the first subframes as the number of the subframes of the first driving mode.
Referring to fig. 6, the PWM first subframe is divided into 16 equal parts, and t represents the time length of each PWM subframe. The PWM first subframe may set 1/16t time for display lighting, the PWM second subframe may set 2/16t time for display lighting, the PWM third subframe may set 4/16t time for display lighting, the PWM first subframe may set 8/16t time for display lighting, and the PWM first subframe may set 16/16t time for display lighting.
For example, when the gray level is 31, the PWM first subframe, the PWM second subframe, the PWM third subframe, the PWM fourth subframe and the PWM fifth subframe in fig. 1 are operated simultaneously, and the operating time is t/16+t/8+t/4+t/2+t = (31/16) t; when the gray level is 32, the PAM subframes in fig. 1 all operate for 5t. Referring to FIG. 5, when the low gray level interval is from 0 to 15, the driving voltage of the PWM driving method is 2V 2 The method comprises the steps of carrying out a first treatment on the surface of the When the low gray level interval is from 16 to 31 gray levels, the driving voltage of the PWM driving mode is 2V 1 -2V 2 . Therefore, when the PWM driving mode is adopted for driving, the brightness corresponding to the gray level of 15 can be approximately equal to 2V 2 * (31/16) t; the luminance corresponding to a gray level of 31 may be approximately equal to (2V 1-2V 2) ×31/16.
Therefore, in the embodiment of the application, the current of 32 gray scales is selected by the current generated by the 31 gray scale voltage, and the 32 gray scale voltage is remodeled by the 32 gray scale current derivation, so that the gray scale transition is completed, the brightness of the picture in the low gray scale can be more finely regulated and controlled, and the accuracy of the color cast phenomenon in the low gray scale is further improved.
In addition, in the related art, gray scale excessive errors are large by using brightness and voltage as a proportional relationship due to the influence of TFT device characteristics. Therefore, in the embodiment of the application, by using the direct relation between the brightness and the current, and by increasing the voltage dimension in the low gray level and combining with the current in the transition gray level, the gamma curves of the first driving mode and the second driving mode can be corrected to the gamma2.2 curve, so that the hybrid driving of the first driving mode and the second driving mode is realized, the power consumption of the display panel is reduced, and the accuracy of the color cast phenomenon in the low gray level is improved.
Step S4: determining a second critical voltage corresponding to the second critical current according to the second critical current;
further, determining a second threshold voltage corresponding to the second threshold current according to the second threshold current includes:
step S41: acquiring the mapping relation between the gray scale to be displayed and the current;
step S42: determining a matching gray scale matched with the second critical current in the gray scale to be displayed according to the mapping relation between the gray scale to be displayed and the current and the second critical current;
step S43: and determining a second critical voltage corresponding to the matching gray scale according to the matching gray scale.
The mapping relationship between the gray scale to be displayed and the current can be preconfigured according to the requirement. For example, after the second critical current I2 corresponding to 32 gray scales is obtained, a matching gray scale matched with the second critical current may be found according to the mapping relationship between the gray scale to be displayed and the current within the range of 0-255 gray scales, and the second critical voltage corresponding to the matching gray scale may be found according to the curve in fig. 4.
Step S5: correcting the gamma curve of the display according to the second critical voltage to obtain a corrected gamma curve;
Further, correcting the gamma curve of the display according to the second critical voltage to obtain a corrected gamma curve, including:
step S51: determining a target transition voltage of the display according to the second critical voltage;
step S52: and correcting the gamma curve of the display according to the target transition voltage of the display to obtain a corrected gamma curve.
In this embodiment, the second threshold voltage may be directly determined as the target Transition voltage (i.e., transition Vdata) of the display. Of course, the target transition voltage of the display may be determined according to the second critical voltage in other manners, which is not limited in this application.
Further, the target transition voltage can be used as an ideal transition voltage for converting the first driving mode and the second driving mode, and the gamma curve of the display can be corrected or adjusted based on the target transition voltage, so as to further reduce the color cast phenomenon during low gray scale. It will be appreciated that the present application is not limited as to how the gamma curve of the display is modified.
Through increasing the voltage dimension of the first driving mode when the gray scale is low, combining with transition critical voltage data, accurately processing the gray scale voltage of a transition area, acquiring the fluctuation range of the transition gray scale voltage through an algorithm, further acquiring a compensation area in a PAM critical voltage data correction module, and then compensating the transition gray scale voltage data.
Step S6: and driving a picture to display based on the corrected gamma curve.
Wherein, in the present embodiment, the gamma curves in fig. 4 and 5 are exemplary. In the actual application process, the gamma curve can be adjusted according to actual needs. For example, the gamma straight line corresponding to each low gray level interval may be adjusted to be in the form of a gamma curve, so long as the color shift phenomenon during the low gray level is more accurately reduced. The present application is not limited to how to drive the screen based on the corrected gamma curve.
Fig. 7 is a schematic diagram showing a driving method of a display according to an embodiment of the present application.
As shown in fig. 7, exemplary embodiments of the present application may input the threshold voltage data of the PWM driving method first, and then increase the voltage dimension of the PWM driving method at the low gray scale through an algorithm. Then, in the embodiment of the application, the critical current of the transition to the PAM driving mode can be calculated through the critical current of the PWM driving mode, and the corresponding gray scale is obtained through an algorithm to correct PAM critical voltage data, so that the gamma2.2 curve is subjected to approximation correction, and the effect of improving the accuracy of the color cast phenomenon in the low gray scale is achieved.
It will be appreciated that the algorithms in the embodiments of the present application may be implemented in a variety of programming languages, and the present application is not limited to how the various algorithms or methods described above are implemented.
In addition, the application also provides a driving module of the display, the driving module comprises: the first critical voltage acquisition module is electrically connected with the first critical current acquisition module and is used for acquiring a first critical voltage input to the display; the first critical current acquisition module is electrically connected with the first critical voltage acquisition module and the second critical current acquisition module and is used for determining a first critical current corresponding to the first critical voltage according to the first critical voltage; the second critical current acquisition module is electrically connected with the first critical current acquisition module and the second critical voltage acquisition module and is used for determining a second critical current of the display based on the first critical current; the second critical voltage acquisition module is electrically connected with the second critical current acquisition module and the gamma curve correction module and is used for determining a second critical voltage corresponding to the second critical current according to the second critical current; the gamma curve correction module is electrically connected with the second critical voltage acquisition module and the display module and is used for correcting the gamma curve of the display according to the second critical voltage to obtain a corrected gamma curve; and the display module is electrically connected with the gamma curve correction module and is used for driving the picture to display based on the corrected gamma curve.
Further, the first threshold voltage acquisition module includes: the critical gray scale acquisition module is used for acquiring the critical gray scale of the display; and the first critical voltage acquisition sub-module is used for determining a first critical voltage corresponding to the critical gray scale.
Further, the driving modes of the display include a first driving mode and a second driving mode, and the critical gray scale obtaining module includes: the gray scale obtaining module is used for obtaining the range of the gray scale to be displayed of the display; the display device comprises a display device, a gray scale dividing module, a display control module and a display control module, wherein the display device is used for displaying gray scales in a display mode; and the critical gray level determining module is used for determining the maximum gray level in the low gray level range as the critical gray level.
Further, the first threshold voltage acquisition sub-module includes: the low gray scale interval determining module is used for dividing the low gray scale range into a plurality of low gray scale intervals; the driving voltage dividing module is used for dividing the driving voltage of the first driving mode according to the plurality of low gray scale intervals to obtain a plurality of first voltages, wherein each low gray scale interval corresponds to one first voltage; and the first critical voltage determining module is used for determining a first voltage corresponding to the critical gray scale as the first critical voltage.
Further, the first threshold voltage determining module includes: the first voltage determining module is used for determining a first voltage corresponding to a low gray scale interval with the lowest order in the plurality of low gray scale intervals; the first voltage calculation module is used for determining a first voltage corresponding to a low gray scale interval adjacent to the low gray scale interval with the lowest order according to the first voltage, and the first voltage is analogized until the determined first voltage corresponds to the critical gray scale; and the first critical voltage determining submodule is used for taking the first voltage corresponding to the critical gray scale as the first critical voltage.
Further, the second critical current acquisition module includes: a subframe number acquisition module, configured to acquire the subframe number of the first driving mode; and the second critical current acquisition sub-module is used for determining the second critical current of the display according to the first critical current and the number of subframes of the first driving mode.
Further, the subframe number acquisition module includes: the sub-frame dividing module is used for dividing a frame of the display according to the first driving mode and the second driving mode to obtain at least one first sub-frame and at least one second sub-frame, wherein the at least one first sub-frame corresponds to the first driving mode, and the at least one second sub-frame corresponds to the second driving mode; and the subframe number acquisition submodule is used for determining the number of the first subframes as the number of the subframes in the first driving mode.
Further, the second threshold voltage acquisition module includes: the mapping relation acquisition module is used for acquiring the mapping relation between the gray scale to be displayed and the current; the matching gray level determining module is used for determining matching gray levels matched with the second critical current in the gray levels to be displayed according to the mapping relation between the gray levels to be displayed and the current and the second critical current; and the second critical voltage acquisition sub-module is used for determining a second critical voltage corresponding to the matched gray scale according to the matched gray scale.
Further, the gamma curve correction module includes: the transition voltage determining module is used for determining a target transition voltage of the display according to the second critical voltage; and the gamma curve correction module is used for correcting the gamma curve of the display according to the target transition voltage of the display to obtain a corrected gamma curve.
Fig. 8 shows a schematic structural diagram of a driving module according to an embodiment of the present application.
As shown in fig. 8, the driving module of the display according to the embodiment of the present application may include a PWM critical current obtaining module, a PWM driving dimension voltage algorithm module, a PAM critical current calculating module, a PAM critical voltage data correcting module, and the like. The PWM critical current acquisition module and the PWM driving dimension voltage algorithm module can be used for receiving PWM critical voltage data input; the PAM critical voltage data correction module may be configured to perform approximation correction on the gamma2.2 curve. For a more detailed portion of the driving module of the display, reference may be made to the driving method of the display, which is not described herein.
In summary, in the embodiment of the present application, the first critical current corresponding to the first critical voltage is determined according to the first critical voltage, then the second critical current of the display is determined based on the first critical current, and then the second critical voltage corresponding to the second critical current is determined according to the second critical current, so that the adjustment of the voltage and the current of the transition gray level can be combined, the gamma curve is corrected to the gamma2.2 curve, the power consumption of the display is further reduced, and the accuracy of the color cast phenomenon when the gray level is low is improved.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The driving method of the display and the driving module of the display provided by the embodiments of the present application are described in detail, and specific examples are applied to illustrate the principles and the implementation of the present application, and the description of the above embodiments is only used to help understand the technical solution and the core idea of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (7)
1. A driving method of a display, wherein the driving modes of the display include a first driving mode and a second driving mode, the first driving mode corresponds to a low gray scale range, the second driving mode corresponds to a high gray scale range, the driving method of the display includes:
acquiring a first threshold voltage input to the display, comprising: acquiring critical gray scale of the display; determining a first critical voltage corresponding to the critical gray scale; wherein the critical gray scale is the maximum gray scale in the low gray scale range;
determining a first critical current corresponding to the first critical voltage according to the first critical voltage;
determining a second critical current of the display based on the first critical current, comprising: acquiring the number of subframes of the first driving mode; determining a second critical current of the display according to the first critical current and the number of subframes of the first driving mode; the obtaining the number of subframes of the first driving mode includes: dividing a frame of the display according to the first driving mode and the second driving mode to obtain at least one first subframe and at least one second subframe, wherein the at least one first subframe corresponds to the first driving mode, and the at least one second subframe corresponds to the second driving mode; determining the number of the first subframes as the number of the subframes of the first driving mode; the second critical current is the actual display current which is higher than the critical gray scale and corresponds to the gray scale adjacent to the critical gray scale in the low gray scale range;
Determining a second critical voltage corresponding to the second critical current according to the second critical current;
correcting the gamma curve of the display according to the second critical voltage to obtain a corrected gamma curve;
and driving a picture to display based on the corrected gamma curve.
2. The method of driving a display according to claim 1, wherein obtaining a critical gray level of the display comprises:
acquiring a range of gray scales to be displayed of the display;
dividing the range of gray scales to be displayed into a low gray scale range and a high gray scale range according to the driving mode of the display, wherein the low gray scale range corresponds to a first driving mode of the display, and the high gray scale range corresponds to a second driving mode of the display;
and determining the maximum gray level in the low gray level range as the critical gray level.
3. The method of driving a display according to claim 1, wherein determining a first threshold voltage corresponding to the critical gray level comprises:
dividing the low gray scale range into a plurality of low gray scale intervals;
dividing the driving voltage of the first driving mode according to the plurality of low gray scale intervals to obtain a plurality of first voltages, wherein each low gray scale interval corresponds to one first voltage;
And determining a first voltage corresponding to the critical gray scale as the first critical voltage.
4. A driving method of a display according to claim 3, wherein determining a first voltage corresponding to the critical gray level as the first critical voltage comprises:
determining a first voltage corresponding to a low gray scale interval with the lowest order in the plurality of low gray scale intervals;
determining a first voltage corresponding to a low gray scale interval adjacent to the low gray scale interval with the lowest order according to the first voltage, and analogizing until the determined first voltage corresponds to the critical gray scale;
and taking the first voltage corresponding to the critical gray scale as the first critical voltage.
5. The method of driving a display according to claim 2, wherein determining a second threshold voltage corresponding to the second threshold current according to the second threshold current comprises:
acquiring the mapping relation between the gray scale to be displayed and the current;
determining a matching gray scale matched with the second critical current in the gray scale to be displayed according to the mapping relation between the gray scale to be displayed and the current and the second critical current;
and determining a second critical voltage corresponding to the matching gray scale according to the matching gray scale.
6. The method of driving a display according to claim 5, wherein correcting the gamma curve of the display according to the second threshold voltage to obtain a corrected gamma curve comprises:
determining a target transition voltage of the display according to the second critical voltage, wherein the target transition voltage is the same as the second critical voltage;
and correcting the gamma curve of the display according to the target transition voltage of the display to obtain a corrected gamma curve.
7. A driving module of a display, wherein a driving manner of the display includes a first driving manner corresponding to a low gray scale range and a second driving manner corresponding to a high gray scale range, the driving module comprising:
the first critical voltage acquisition module is electrically connected with the first critical current acquisition module and is used for acquiring a first critical voltage input to the display, and comprises: acquiring critical gray scale of the display; determining a first critical voltage corresponding to the critical gray scale; wherein the critical gray scale is the maximum gray scale in the low gray scale range;
The first critical current acquisition module is electrically connected with the first critical voltage acquisition module and the second critical current acquisition module and is used for determining a first critical current corresponding to the first critical voltage according to the first critical voltage;
the second critical current acquisition module is electrically connected with the first critical current acquisition module and the second critical voltage acquisition module, and is used for determining the second critical current of the display based on the first critical current, and comprises the following components: acquiring the number of subframes of the first driving mode; determining a second critical current of the display according to the first critical current and the number of subframes of the first driving mode; the obtaining the number of subframes of the first driving mode includes: dividing a frame of the display according to the first driving mode and the second driving mode to obtain at least one first subframe and at least one second subframe, wherein the at least one first subframe corresponds to the first driving mode, and the at least one second subframe corresponds to the second driving mode; determining the number of the first subframes as the number of the subframes of the first driving mode; the second critical current is the actual display current which is higher than the critical gray scale and corresponds to the gray scale adjacent to the critical gray scale in the low gray scale range;
The second critical voltage acquisition module is electrically connected with the second critical current acquisition module and the gamma curve correction module and is used for determining a second critical voltage corresponding to the second critical current according to the second critical current;
the gamma curve correction module is electrically connected with the second critical voltage acquisition module and the display module and is used for correcting the gamma curve of the display according to the second critical voltage to obtain a corrected gamma curve;
and the display module is electrically connected with the gamma curve correction module and is used for driving the picture to display based on the corrected gamma curve.
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| TW200705348A (en) * | 2005-03-31 | 2007-02-01 | Casio Computer Co Ltd | Display drive apparatus, display apparatus and drive control method thereof |
| CN108962126A (en) * | 2018-09-29 | 2018-12-07 | 武汉天马微电子有限公司 | A kind of displaying panel driving method, drive system and the display device comprising it |
| CN111415616A (en) * | 2020-04-27 | 2020-07-14 | 京东方科技集团股份有限公司 | Method for improving picture display quality, time sequence controller and display device |
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| TW200705348A (en) * | 2005-03-31 | 2007-02-01 | Casio Computer Co Ltd | Display drive apparatus, display apparatus and drive control method thereof |
| CN108962126A (en) * | 2018-09-29 | 2018-12-07 | 武汉天马微电子有限公司 | A kind of displaying panel driving method, drive system and the display device comprising it |
| CN111415616A (en) * | 2020-04-27 | 2020-07-14 | 京东方科技集团股份有限公司 | Method for improving picture display quality, time sequence controller and display device |
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