CN112542122A - Display device driving method and display device - Google Patents
Display device driving method and display device Download PDFInfo
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- CN112542122A CN112542122A CN202011408549.6A CN202011408549A CN112542122A CN 112542122 A CN112542122 A CN 112542122A CN 202011408549 A CN202011408549 A CN 202011408549A CN 112542122 A CN112542122 A CN 112542122A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0291—Details of output amplifiers or buffers arranged for use in a driving circuit
Abstract
The application provides a driving method of a display device and the display device, the driving method of the display device obtains gray scale data signals corresponding to a row of sub-pixels in a frame of picture to be displayed, then determining a gray scale jump amplitude value corresponding to a row of sub-pixels according to the gray scale data signal, generating a corresponding bias current control signal according to the gray scale jump amplitude value, then determining the magnitude of a bias current provided by a bias circuit to the output buffer circuit according to the bias current control signal, finally adjusting an input drive signal input to the output buffer circuit according to the bias current to obtain a source drive signal, thereby dynamically adjusting the magnitude of the bias current according to the gray scale data signal of a display picture, when the display panel displays a light-load picture, the driving thrust of the source driving signal can be reduced, so that the power consumption of the display device is reduced.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a driving method of a display device and a display device.
Background
The source driver of the display panel of the existing display device is internally provided with an output buffer module and a bias circuit, the bias circuit is used for providing bias current for the output buffer module, the magnitude of the bias current is in direct proportion to the driving thrust of a source driving signal, the output buffer module aims to enhance the driving thrust of the source driving signal according to the bias current, and when the display panel displays a picture with a large load, the driving thrust of the source driving signal can be ensured to drive a pixel array of the display panel.
The bias current output by the bias circuit in the conventional source driver is stable and constant, which means that the bias currents output by the bias circuit are all equal when the display panel displays different pictures with different loads. However, when the display panel displays a light-load picture, the driving thrust actually required by the source driving signal should be smaller than the driving thrust of the source driving signal when the display panel displays a heavy-load picture, i.e., the bias current actually required by the display panel when the display panel displays the light-load picture should be smaller than the bias current required when the display panel displays the heavy-load picture. Therefore, when the display panel displays a display image of any load and the bias current of the display panel is kept unchanged, the driving capability of the source driving signal is too large when the display panel displays a light-load image, which results in waste of power consumption of the display device.
In summary, the conventional display device has a problem that the driving capability of the source driving signal is too large when the display panel displays a light-load picture due to the constant bias current, which causes power consumption waste of the display device. Therefore, it is necessary to provide a driving method of a display device and a display device to improve the defect.
Disclosure of Invention
The embodiment of the application provides a driving method of a display device and the display device, which are used for solving the problem of power consumption waste of the display device caused by overlarge driving capability of a source driving signal when a display panel displays a light-load picture due to the fact that a bias current is kept unchanged in the conventional display device.
An embodiment of the present application provides a driving method of a display device, where the driving method is applied to a display device, where the display device includes a display panel, a detection module, and a source driver, where the source driver includes a plurality of output channels, an output buffer circuit corresponding to the output channels, a bias circuit for providing a bias current to the output buffer circuit, and a bias current control module, and the driving method of the display device includes:
acquiring gray scale data signals corresponding to a row of sub-pixels in a frame of picture to be displayed;
determining a gray scale jump amplitude value corresponding to the column of sub-pixels according to the gray scale data signal;
generating a corresponding bias current control signal according to the gray scale jump amplitude value;
determining a bias current provided by the bias circuit to the output buffer circuit according to the bias current control signal; and
and adjusting the input driving signal input to the output buffer circuit according to the bias current to obtain a source driving signal.
According to an embodiment of the present application, the gray scale data signal includes gray scale voltage polarities, gray scale voltage values, and gray scale values corresponding to a plurality of sub-pixels in the row of sub-pixels one to one, and the step of determining the gray scale transition amplitude value corresponding to the row of sub-pixels according to the gray scale data signal includes:
sequentially calculating gray scale voltage difference values or gray scale difference values of two adjacent sub-pixels in the row of sub-pixels according to the gray scale voltage polarity and the gray scale voltage value or according to the gray scale voltage polarity and the gray scale value;
accumulating the absolute value of the gray scale voltage difference value or the absolute value of the gray scale difference value of two adjacent sub-pixels in the row of sub-pixels to obtain a total value of the gray scale jump amplitude;
and dividing the total value of the gray scale jump amplitude by the number of sub-pixels in the row of sub-pixels to obtain the gray scale jump amplitude value.
According to an embodiment of the present application, the step of sequentially calculating the gray scale voltage difference value or the gray scale difference value of two adjacent sub-pixels in the row of sub-pixels according to the gray scale voltage polarity and the gray scale voltage value or according to the gray scale voltage polarity and the gray scale value includes:
judging the gray scale voltage polarity of two adjacent sub-pixels;
if the gray scale voltage polarities of two adjacent sub-pixels are the same, subtracting the gray scale voltage values or the gray scale values of the two adjacent sub-pixels to obtain a gray scale voltage difference value or a gray scale difference value;
and if the gray scale voltage polarities of the two adjacent sub-pixels are different, adding the absolute values or the gray scale values of the gray scale voltage values of the two adjacent sub-pixels to obtain the gray scale voltage difference value or the gray scale difference value.
According to an embodiment of the present application, before the step of generating the corresponding bias current control signal according to the grayscale transition amplitude value, the method further includes:
setting a first mapping table of the gray scale jump amplitude value and the bias current control signal;
the first mapping table comprises a corresponding relation between a plurality of gray scale jump amplitude values and corresponding control codes.
According to an embodiment of the present application, before the step of determining the magnitude of the bias current provided by the bias circuit to the output buffer circuit according to the bias current control signal, the method further includes:
setting a second mapping table of the bias current control signal and the bias current;
the second mapping table comprises a corresponding relation between a plurality of control codes and corresponding bias current.
An embodiment of the present application further provides a display device, including:
a display panel;
the detection module is used for acquiring a gray scale data signal corresponding to a row of sub-pixels in a frame of picture to be displayed of the display panel, determining a gray scale jump amplitude value corresponding to the row of sub-pixels according to the gray scale data signal, and generating a corresponding bias current control signal according to the gray scale jump amplitude value;
the source driver comprises a plurality of output channels, output buffer circuits corresponding to the output channels, a bias circuit for providing bias current for the output buffer circuits, and a bias current control module for determining the magnitude of the bias current according to the bias current control signal, wherein the output buffer circuits are used for adjusting input drive signals input to the output buffer circuits according to the bias current to obtain source drive signals.
According to an embodiment of the present application, the detecting module includes:
the gray scale data signal acquisition module is used for acquiring gray scale voltage polarities, gray scale voltage values and gray scale values which correspond to the plurality of sub-pixels in the row of sub-pixels one by one in the gray scale data signals;
the first calculation module is used for sequentially calculating gray scale voltage difference values or gray scale difference values of two adjacent sub-pixels in the row of sub-pixels according to the gray scale voltage polarity and the gray scale voltage value or according to the gray scale voltage polarity and the gray scale value;
the second calculation module is used for accumulating the absolute value of the gray scale voltage difference value or the absolute value of the gray scale difference value of two adjacent sub-pixels in the row of sub-pixels to obtain a total value of the gray scale jump amplitude;
and the third calculation module is used for dividing the total gray scale jump amplitude value by the number of the sub-pixels in the row of sub-pixels to obtain the gray scale jump amplitude value.
According to an embodiment of the present application, the detection module includes a control signal setting module, configured to set a first mapping table of the grayscale transition amplitude value and the bias current control signal, where the first mapping table includes a correspondence between a plurality of grayscale transition amplitude values and corresponding control codes.
According to an embodiment of the present application, the source driver further includes a bias current setting module, configured to set a second mapping table of the bias current control signal and the bias current, where the second mapping table includes a correspondence relationship between a plurality of control codes and corresponding magnitudes of the bias current.
According to an embodiment of the present application, the detecting module is disposed in the source driver, the source driver further includes a storage module, the storage module is respectively connected to the detecting module, the bias current control module, and the bias current setting module, and the storage module is configured to store the first mapping table and the second mapping table.
The beneficial effects of the embodiment of the application are as follows: the driving method of the display device and the display device provided by the embodiment of the application can reduce the driving thrust of the source driving signal by obtaining the gray scale data signal corresponding to a row of sub-pixels connected to the same data line in a frame of picture to be displayed, then determining the gray scale jump amplitude value corresponding to the row of sub-pixels according to the gray scale data signal, then generating the corresponding bias current control signal according to the gray scale jump amplitude value, then determining the magnitude of the bias current provided by the bias circuit to the output buffer circuit according to the bias current control signal, and finally adjusting the input driving signal input to the output buffer circuit according to the bias current to obtain the source driving signal, thereby dynamically adjusting the magnitude of the bias current according to the gray scale data signal of the display picture, thereby reducing power consumption of the display device.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating a driving method of a display device according to an embodiment of the present disclosure.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments that can be implemented by the application. Directional phrases used in this application, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], etc., refer only to the directions of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and understanding, and is in no way limiting. In the drawings, elements having similar structures are denoted by the same reference numerals.
The present application will be further described with reference to the following drawings and specific examples.
An embodiment of the present application provides a driving method of a display device, where the driving method is applied to a display device, as shown in fig. 1, fig. 1 is a schematic structural diagram of the display device provided in the embodiment of the present application, the display device includes a display panel 10, a timing controller 11, a source driver 12, and a detection module 13, the source driver 12 includes a plurality of output channels, an output buffer circuit 124 corresponding to the output channels, a bias circuit 123 for providing a bias current to the output buffer circuit 124, a bias current control module 122, and a source driving circuit 121.
Referring to fig. 2, fig. 2 is a schematic flow chart of a driving method of a display device according to an embodiment of the present application, where the driving method of the display device includes:
step S10: and acquiring gray scale data signals corresponding to a row of sub-pixels connected to the same data line in a frame of picture to be displayed.
In one embodiment, the display panel includes a plurality of rows of sub-pixels corresponding to the plurality of output channels, each row of sub-pixels includes a plurality of sub-pixels, and the gray scale data signal includes gray scale voltage polarities, gray scale voltage values, and gray scale values corresponding to the plurality of sub-pixels in a row of sub-pixels one to one.
In one embodiment, the driving method of the display panel 10 is fixed, and the type of the gray-scale data signal to be acquired needs to be determined according to the driving method of the display panel 10. Taking the display panel with row inversion as an example, the gray scale voltage polarity of each sub-pixel in a row of sub-pixels is the same in each frame, so that only the gray scale voltage value or gray scale value needs to be obtained, and the gray scale voltage polarity of each sub-pixel does not need to be determined. For a display panel of the column inversion or dot inversion type, the gray scale voltage polarities of any two adjacent sub-pixels in a row of sub-pixels are different, and not only the gray scale voltage value or the gray scale value but also the gray scale voltage polarity needs to be obtained.
In an embodiment, the type of the acquired gray-scale data signal is also related to the position where the detection module 13 is disposed, and if the detection module 13 is disposed in the timing controller 11 of the display device, since the pixel information storage module in the timing controller 11 stores the digital signal of the gray-scale value, the detection module 13 can only acquire the gray-scale value from the pixel information storage module of the timing controller 11. If the detecting module 13 is disposed in the source driver 12, since the gray scale value, the gray scale voltage value and the gray scale voltage polarity are stored in the source driver 12 at the same time, the gray scale voltage polarity, the gray scale value or the gray scale voltage value can be obtained according to the requirement. If the detecting module 13 is disposed outside the timing controller 11 and the source driver 12, the detecting module 13 may be connected to the timing controller 11 and the source driver 12, and at this time, the detecting module 13 may simultaneously obtain the gray scale voltage polarity, the gray scale value and the gray scale voltage value, and the type of the obtained gray scale data signal may be limited according to the actual situation, which is not limited herein.
Step S20: and determining a gray scale jump amplitude value corresponding to a row of sub-pixels according to the gray scale data signal.
In an embodiment, the step of determining the gray level transition amplitude value corresponding to the row of sub-pixels according to the gray level data signal includes: sequentially calculating gray scale voltage difference values or gray scale difference values of two adjacent sub-pixels in the row of sub-pixels according to the gray scale voltage polarity and the gray scale voltage value or according to the gray scale voltage polarity and the gray scale value; accumulating the absolute value of the gray scale voltage difference value or the absolute value of the gray scale difference value of two adjacent sub-pixels in the row of sub-pixels to obtain a total value of the gray scale jump amplitude; and dividing the total value of the gray scale jump amplitude by the number of sub-pixels in the row of sub-pixels to obtain the gray scale jump amplitude value.
The gray scale voltage value and the gray scale value change can both reflect the load degree of the current display panel, the calculation mode of the gray scale jump amplitude total value can obtain a gray scale voltage difference value according to the gray scale voltage polarity and the gray scale voltage value, then the gray scale jump amplitude total value obtained by accumulating the gray scale voltage difference value is divided by the number of the sub-pixels to obtain a gray scale jump amplitude value, and also can obtain a gray scale difference value according to the gray scale voltage polarity and the gray scale value, and then the gray scale jump amplitude total value obtained by accumulating the gray scale difference value is divided by the number of the sub-pixels to obtain a gray scale jump amplitude value. The calculation method of the gray level jump amplitude can be limited according to the actual situation, and is not limited here.
In an embodiment, the step of calculating the gray scale voltage difference or the gray scale difference between two adjacent sub-pixels in the row of sub-pixels includes: judging the gray scale voltage polarity of two adjacent sub-pixels; if the gray scale voltage polarities of two adjacent sub-pixels are the same, subtracting the gray scale voltage values or the gray scale values of the two adjacent sub-pixels to obtain a gray scale voltage difference value or a gray scale difference value; and if the gray scale voltage polarities of the two adjacent sub-pixels are different, adding the absolute values or the gray scale values of the gray scale voltage values of the two adjacent sub-pixels to obtain the gray scale voltage difference value or the gray scale difference value.
Taking a display panel with 256 gray scales in a row inversion driving manner as an example, the number of sub-pixels in a row of sub-pixels is n, the polarities of two adjacent sub-pixels in the row of sub-pixels are the same, and at this time, the gray scale difference value of two adjacent sub-pixels can be obtained only by subtracting the gray scale values of two adjacent sub-pixels. When the display panel displays a horizontal stripe (horizontal-stripe) picture, a display picture with alternately circulating bright sub-pixels and dark sub-pixels in one row is presented in one frame, wherein the gray-scale value of the bright sub-pixels is 255, the gray-scale value of the dark sub-pixels is 0, the gray-scale difference value of two adjacent sub-pixels is 255 or-255, the total value of the gray-scale jump amplitude is 255(n-1), and the gray-scale jump amplitude value is 255(n-1)/(n-1) ═ 255. Taking the display panel with the dot inversion or the column inversion driving method as an example, the gray scale voltage polarities of two adjacent sub-pixels in a row of sub-pixels are opposite, when it is detected that the gray scale voltage polarities of the two adjacent sub-pixels are different, and when the gray scale voltage difference or the gray scale difference of the two adjacent sub-pixels is calculated, the gray scale voltage polarity needs to be added before the gray scale voltage value or the gray scale value, for example, when the (n-1) th sub-pixel is negative, the gray scale is 100, the nth sub-pixel is positive, and the gray scale is 50, the gray scale difference between the nth sub-pixel and the n-1 th sub-pixel is (+50) - (-100) ═ 150, that is, the absolute value or the gray scale value of the gray scale voltage values of the two adjacent sub-pixels are added to obtain the gray scale voltage difference or the gray scale difference.
Step S30: and generating a corresponding bias current control signal according to the gray scale jump amplitude value.
In an embodiment, the gray-scale transition amplitude value may be divided into a plurality of value intervals, and each value interval corresponds to a bias current control signal, that is, a load type of a display frame. When the calculated grayscale transition amplitude value falls into one of the intervals, the mapping module disposed in the detection module 13 can query the control code of the corresponding bias current control signal according to the grayscale transition amplitude value, and input the bias current control signal to the bias current control module 122. Taking the display panel with 256 gray scales in the column inversion driving manner as an example, the display frame types of the display panel can be divided into a heavy-load frame and a light-load frame, where the heavy-load frame is a horizontal stripe (horizontal stripe) frame, the gray scale jump amplitude value corresponding to the heavy-load frame is 255, and the display frame with the gray scale jump amplitude value smaller than 255 is the light-load frame. When the calculated gray scale jump amplitude value is 255, the detection module 13 generates a corresponding first bias current control signal, and when the calculated gray scale jump amplitude value is smaller than 255, the detection module 13 generates a corresponding second bias current control signal, and the bias current corresponding to the second bias current control signal should be smaller than the bias current corresponding to the first bias current control signal, so as to increase the current of the source drive signal corresponding to the heavy-load picture, thereby improving the drive thrust of the source drive signal corresponding to the heavy-load picture, and reducing the current of the source drive signal corresponding to the light-load picture, thereby reducing the drive thrust of the source drive signal corresponding to the light-load picture, thereby avoiding the waste of power consumption caused by the overlarge source drive signal when the light-load picture is displayed, and further reducing the power consumption of the display device. Of course, the gray level transition amplitude value of the display panel with reversed polarity may also be divided into 4 equal-width intervals according to the gray level value, which are 0 to 63, 64 to 127, 128 to 191, and 192 to 255 respectively, and 4 bias current control signals corresponding to the intervals one by one may be set.
In other embodiments, the grayscale jump amplitude value may also be divided into more levels, so that the difference between two adjacent grayscale jump amplitudes is small, and thus, under the condition of different grayscale values or grayscale voltage values, a more accurate bias current may be selected, and the waste of power consumption caused by the fact that the deviation of the selected bias current from the actually required bias current is larger is avoided. The specific level of dividing the grayscale jump amplitude value can be limited according to the actual situation, and is not limited here.
In an embodiment, before the step of generating the corresponding bias current control signal according to the grayscale transition amplitude value, a first mapping table of the grayscale transition amplitude value and the bias current control signal should be further set. The first mapping table comprises the corresponding relation between the gray scale jump amplitude value and the corresponding control code. Taking the display panel in the column inversion manner as an example, the grayscale jump amplitude value is divided into 4 equal-width intervals, which are respectively 0-63, 64-127, 128-191, and 192-255, the control code of the bias current control signal corresponding to the interval can be identified by two-bit data, which are respectively 00, 01, 10, and 11, when the calculated grayscale jump amplitude value is between 0-63, the bias current control signal with the control code of 00 is output to the bias current control module, and the bias current control module can determine the magnitude of the corresponding bias current according to the control code. In other embodiments, the control code may also be adjusted according to the level of the gray level transition amplitude division, and the format and type of the specific control code may be limited according to the actual situation, which is not limited herein.
Step S40: and determining the magnitude of the bias current provided by the bias circuit to the output buffer circuit according to the bias current control signal.
In an embodiment, the bias current control module 122 determines the magnitude of the bias current provided by the bias circuit 123 to the output buffer circuit 124 according to the received bias current control signal, and generates a corresponding bias current adjustment signal, and inputs the bias current adjustment signal to the bias circuit 123, so as to drive the bias circuit 123 to generate the bias current with the corresponding magnitude.
In an embodiment, before the step of determining the magnitude of the bias current provided by the bias circuit to the output buffer circuit according to the bias current control signal, the method further includes: and setting a second mapping table of the bias current control signal and the bias current. Wherein the second mapping table includes a correspondence between the control code and a corresponding magnitude of the bias current. Taking the display panel in the column inversion manner as an example, the control codes of the 4 bias current control signals are 00, 01, 10, and 11, respectively, in this embodiment, 4 bias currents with different magnitudes corresponding to the control codes one by one need to be set, so that the bias current control module can determine the magnitude of the corresponding bias current according to the control code of the bias current control signal.
Step S50: and adjusting the input driving signal input to the output buffer circuit according to the bias current to obtain a source driving signal.
In an embodiment, the output buffer circuit 124 receives the bias current provided by the bias circuit 123, adjusts the input driving signal output from the digital-to-analog converter in the source driving circuit 121 to the output buffer circuit 124 according to the bias current to obtain a source driving signal, and outputs the source driving signal to a corresponding output channel, so as to output the source driving signal to a corresponding column of sub-pixels in the display panel 10 through the output channel and charge the column of sub-pixels.
Specifically, the output buffer circuit 124 includes a plurality of operational amplifiers 125, wherein non-inverting input terminals of the plurality of operational amplifiers 125 are all connected to the output terminal of the digital-to-analog converter in the source driving circuit 121, an output terminal of each of the plurality of operational amplifiers 125 is respectively connected to a corresponding output channel and an inverting input terminal of the operational amplifier 125, and a power supply terminal of the plurality of operational amplifiers 125 is connected to the output terminal of the bias circuit 123.
As can be seen from the above, the driving method of the display device provided in the embodiment of the present application obtains the gray scale data signal corresponding to a row of sub-pixels connected to the same data line in a frame of image to be displayed, determines the gray scale transition amplitude value corresponding to the row of sub-pixels according to the gray scale data signal, generates the corresponding bias current control signal according to the gray scale transition amplitude value, determines the magnitude of the bias current provided by the bias circuit to the output buffer circuit according to the bias current control signal, and finally adjusts the input driving signal input to the output buffer circuit according to the bias current to obtain the source driving signal, so as to dynamically adjust the magnitude of the bias current according to the gray scale data signal of the display image, and reduce the driving thrust of the source driving signal when the display panel displays a light-load image, thereby reducing power consumption of the display device.
Fig. 1 is a schematic structural diagram of the display device provided in the embodiment of the present application, where the display device includes a display panel 10, a timing controller 11, a source driver 12, and a detection module 13, and the detection module 13 is configured to acquire a gray scale data signal corresponding to a row of sub-pixels in a frame of a frame to be displayed, determine a gray scale transition amplitude value corresponding to the row of sub-pixels according to the gray scale data signal, and generate a corresponding bias current control signal according to the gray scale transition amplitude value. The source driver 12 includes a plurality of output channels, an output buffer circuit 124 corresponding to the plurality of output channels, a bias circuit 123 for providing a bias current to the output buffer circuit 124, a bias current control module 122 for determining the magnitude of the bias current according to the bias current control signal, and a source driving circuit 121, wherein the output buffer circuit 124 is configured to adjust an input driving signal input to the output buffer circuit 124 according to the bias current to obtain a source driving signal.
The source driving circuit 121 includes a shift register for generating a pulse signal according to a clock signal and a gray-scale data signal output from the timing controller 11, a latch for latching data according to a shift order of the shift register and outputting the stored data in response to a load signal, and a digital-to-analog conversion circuit for generating an input driving signal corresponding to the gray-scale data signal using a gray-scale voltage, which are sequentially connected.
In one embodiment, the detecting module 13 includes a gray scale data signal obtaining module, a first calculating module, a second calculating module and a third calculating module, wherein an input end and an output end of the first calculating module are respectively connected to the gray scale data signal module and the second calculating module, an input end of the third calculating module is connected to an output end of the second calculating module, the gray scale data signal obtaining module is configured to obtain gray scale voltage polarities, gray scale voltage values and gray scale values corresponding to a plurality of sub-pixels in the row of sub-pixels, the first calculating module is configured to sequentially calculate gray scale voltage differences or gray scale difference values of two adjacent sub-pixels in the row of sub-pixels according to the gray scale voltage polarities and the gray scale voltage values or according to the gray scale voltage polarities and the gray scale values, the second calculating module is configured to accumulate absolute values of the gray scale voltage differences or absolute values of the gray scale difference values of the two adjacent sub-pixels in the row of sub-pixels, and the third calculation module is used for dividing the total gray scale jump amplitude value by the number of sub-pixels in the row of sub-pixels to obtain the gray scale jump amplitude value.
In an embodiment, the driving method of the display panel may include row inversion, column inversion, frame inversion or dot inversion, and the type of the gray-scale data signal required to be detected by the detecting module 13 is different according to different driving methods. Taking the display panel with the row inversion driving method as an example, in one frame of display picture, the gray scale voltages of a row of sub-pixels on the display panel have the same polarity, and only the gray scale value or the gray scale voltage corresponding to the sub-pixel needs to be acquired by the gray scale data signal acquisition module of the detection module 13. For a display panel with dot inversion or row inversion driving, in a frame of display screen, the gray scale voltage polarities of two adjacent sub-pixels in a row of sub-pixels are opposite, and the gray scale voltage polarity and the gray scale voltage value or the gray scale value need to be acquired simultaneously by the detection module 13.
In an embodiment, the detecting module 13 includes a control signal setting module, and the control signal setting module is configured to set a first mapping table of the grayscale transition amplitude value and the bias current control signal, where the first mapping table includes a corresponding relationship between the grayscale transition amplitude value and a corresponding control code. In this embodiment, the control signal setting module is implemented by an actual circuit integrated in the detection module 13, and in other embodiments, the control signal setting module may also be implemented by a computer program, and in this case, the control signal setting module does not need to be integrated in the actual circuit of the detection module 13, and may also be independently present in an external computer device or a storage medium.
In an embodiment, the source driver 12 further includes a bias current setting module, configured to set a second mapping table of the bias current control signal and the bias current, where the second mapping table includes a correspondence relationship between the control code and the corresponding magnitude of the bias current. In this embodiment, the bias current setting module is implemented by an actual circuit integrated in the source driver 12, and in other embodiments, the bias current setting module may also be implemented by a computer program, in which case the bias current setting module does not need to be integrated in the actual circuit of the source driver 12, and may also exist in an external computer device or a storage medium independently.
In an embodiment, the detecting module 13 is disposed in the source driver 12, the source driver 12 further includes a storage module, the storage module is respectively connected to the detecting module 13, the bias current control module, and the bias current setting module, and the storage module is configured to store the first mapping table and the second mapping table. In other embodiments, the detecting module 13 may also be disposed in the timing controller 11, and the bias current control signal generated by the detecting module 13 according to the gray-scale data signal may be output to the source driver 12 together with the pixel data signal generated by the timing controller 11, or may be output to the source driver 12 through a signal line alone. In other embodiments, the detecting module 13 may be disposed outside the timing controller 11 and the source driver 12, and selectively connected to the timing controller 11 or the source driver 12 through a signal line, and may be configured to detect a gray-scale data signal in the timing controller 11 and output a bias current control signal to the source driver 12, or may be configured to detect a gray-scale data signal in the source driver 12 and feed back the bias current signal to the bias current control module 122 in the source driver 12, where a specific location of the detecting module 13 and a connection relationship between the detecting module and the timing controller 11 and the source driver 12 may be defined according to an actual situation, and are not limited herein.
In one embodiment, the output buffer circuit 124 includes a plurality of operational amplifiers 125, a non-inverting input terminal of each operational amplifier 125 is connected to an output terminal of a digital-to-analog converter in the source driving circuit 121, output terminals of the operational amplifiers 125 are respectively connected to a corresponding output channel and an inverting input terminal of the operational amplifier 125, a power terminal of each operational amplifier 125 is connected to an output terminal of the bias circuit 123, and the operational amplifiers 125 generate the source driving signals according to the bias current and the input driving signals output by the digital-to-analog converters.
As can be seen from the above, in the display device provided in the embodiment of the present application, the gray scale data signal corresponding to a row of sub-pixels connected to the same data line in a frame of image to be displayed is obtained through the detection unit, the gray scale transition amplitude value corresponding to the row of sub-pixels is determined according to the gray scale data signal, the corresponding bias current control signal is generated according to the gray scale transition amplitude value, the bias current provided by the bias circuit to the output buffer circuit is determined according to the bias current control signal through the bias current control module, and finally the input driving signal input to the output buffer circuit is adjusted according to the bias current through the output buffer circuit to obtain the source driving signal, so that the magnitude of the bias current can be dynamically adjusted according to the gray scale data signal of the display image, when the display panel displays a light-loading image, the driving thrust of the source driving signal can be reduced, thereby reducing the power consumption of the display device.
In summary, although the present application has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application is defined by the appended claims.
Claims (10)
1. A driving method of a display device is applied to the display device, the display device includes a display panel, a detection module and a source driver, the source driver includes a plurality of output channels, output buffer circuits corresponding to the output channels, a bias circuit for providing a bias current to the output buffer circuits, and a bias current control module, the driving method of the display device includes:
acquiring gray scale data signals corresponding to a row of sub-pixels in a frame of picture to be displayed;
determining a gray scale jump amplitude value corresponding to the column of sub-pixels according to the gray scale data signal;
generating a corresponding bias current control signal according to the gray scale jump amplitude value;
determining a bias current provided by the bias circuit to the output buffer circuit according to the bias current control signal; and
and adjusting the input driving signal input to the output buffer circuit according to the bias current to obtain a source driving signal.
2. The method according to claim 1, wherein the gray scale data signal comprises gray scale voltage polarities, gray scale voltage values and gray scale values corresponding to a plurality of sub-pixels in the row of sub-pixels, and the step of determining the gray scale transition amplitude values corresponding to the row of sub-pixels according to the gray scale data signal comprises:
sequentially calculating gray scale voltage difference values or gray scale difference values of two adjacent sub-pixels in the row of sub-pixels according to the gray scale voltage polarity and the gray scale voltage value or according to the gray scale voltage polarity and the gray scale value;
accumulating the absolute value of the gray scale voltage difference value or the absolute value of the gray scale difference value of two adjacent sub-pixels in the row of sub-pixels to obtain a total value of the gray scale jump amplitude;
and dividing the total value of the gray scale jump amplitude by the number of sub-pixels in the row of sub-pixels to obtain the gray scale jump amplitude value.
3. The method as claimed in claim 2, wherein the step of sequentially calculating the gray scale voltage difference value or gray scale difference value of two adjacent sub-pixels in the row of sub-pixels according to the gray scale voltage polarity and the gray scale voltage value or according to the gray scale voltage polarity and the gray scale value comprises:
judging the gray scale voltage polarity of two adjacent sub-pixels;
if the gray scale voltage polarities of two adjacent sub-pixels are the same, subtracting the gray scale voltage values or the gray scale values of the two adjacent sub-pixels to obtain the gray scale voltage difference value or the gray scale difference value;
and if the gray scale voltage polarities of the two adjacent sub-pixels are different, adding the absolute values or the gray scale values of the gray scale voltage values of the two adjacent sub-pixels to obtain the gray scale voltage difference value or the gray scale difference value.
4. The method for driving a display device according to any one of claims 1 to 3, further comprising, before the step of generating the corresponding bias current control signal according to the grayscale transition amplitude value:
setting a first mapping table of the gray scale jump amplitude value and the bias current control signal;
the first mapping table comprises a corresponding relation between a plurality of gray scale jump amplitude values and corresponding control codes.
5. The method for driving a display device according to claim 4, further comprising, before the step of determining the magnitude of the bias current supplied from the bias circuit to the output buffer circuit based on the bias current control signal:
setting a second mapping table of the bias current control signal and the bias current;
the second mapping table comprises a corresponding relation between a plurality of control codes and corresponding bias current.
6. A display device, comprising:
a display panel;
the detection module is used for acquiring a gray scale data signal corresponding to a row of sub-pixels in a frame of picture to be displayed of the display panel, determining a gray scale jump amplitude value corresponding to the row of sub-pixels according to the gray scale data signal, and generating a corresponding bias current control signal according to the gray scale jump amplitude value;
the source driver comprises a plurality of output channels, output buffer circuits corresponding to the output channels, a bias circuit for providing bias current for the output buffer circuits, and a bias current control module for determining the magnitude of the bias current according to the bias current control signal, wherein the output buffer circuits are used for adjusting input drive signals input to the output buffer circuits according to the bias current to obtain source drive signals.
7. The display device as claimed in claim 6, wherein the detecting module comprises:
the gray scale data signal acquisition module is used for acquiring gray scale voltage polarities, gray scale voltage values and gray scale values which correspond to the plurality of sub-pixels in the row of sub-pixels one by one in the gray scale data signals;
the first calculation module is used for sequentially calculating gray scale voltage difference values or gray scale difference values of two adjacent sub-pixels in the row of sub-pixels according to the gray scale voltage polarity and the gray scale voltage value or according to the gray scale voltage polarity and the gray scale value;
the second calculation module is used for accumulating the absolute value of the gray scale voltage difference value or the absolute value of the gray scale difference value of two adjacent sub-pixels in the row of sub-pixels to obtain a total value of the gray scale jump amplitude;
and the third calculation module is used for dividing the total gray scale jump amplitude value by the number of the sub-pixels in the row of sub-pixels to obtain the gray scale jump amplitude value.
8. The display device as claimed in claim 6 or 7, wherein the detecting module comprises a control signal setting module for setting a first mapping table of the grayscale transition amplitude values and the bias current control signals, the first mapping table comprising a plurality of grayscale transition amplitude values corresponding to corresponding control codes.
9. The display device of claim 8, wherein the source driver further comprises a bias current setting module for setting a second mapping table of the bias current control signal and the bias current, the second mapping table comprising a plurality of control codes corresponding to the magnitude of the bias current.
10. The display device according to claim 9, wherein the detecting module is disposed in the source driver, the source driver further comprises a storage module, the storage module is respectively connected to the detecting module, the bias current control module and the bias current setting module, and the storage module is configured to store the first mapping table and the second mapping table.
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| CN202011408549.6A CN112542122B (en) | 2020-12-04 | 2020-12-04 | Display device driving method and display device |
| PCT/CN2020/141093 WO2022116335A1 (en) | 2020-12-04 | 2020-12-29 | Driving method for display device and display device |
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| CN202011408549.6A CN112542122B (en) | 2020-12-04 | 2020-12-04 | Display device driving method and display device |
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| CN112542122B (en) | 2022-09-09 |
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