CN114822434A - Display device and driving method thereof - Google Patents
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- CN114822434A CN114822434A CN202210373011.9A CN202210373011A CN114822434A CN 114822434 A CN114822434 A CN 114822434A CN 202210373011 A CN202210373011 A CN 202210373011A CN 114822434 A CN114822434 A CN 114822434A
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The embodiment of the application provides a display device and a driving method thereof, wherein the display device comprises M data lines which are arranged at intervals, N gate lines which are arranged at intervals, a plurality of first switches which are electrically connected with the M data lines, and a control module. N grid lines and M data lines are crossed to define N rows of pixel regions M columns of pixel regions, and each pixel region is internally provided with one pixel unit. The plurality of first switches are used for communicating the M data lines. The control module is electrically connected with the control ends of the first switches respectively, and before the H-th row of pixel units are driven, whether the M data lines need to carry out charge sharing is judged according to the data voltages of the H-1-th row of pixel units, and each first switch is turned on after a preset charge sharing condition is met, so that the M data lines are communicated, and each data line carries out charge sharing, so that the aim of reducing the driving power consumption of the display device can be achieved, and the increase of the power consumption caused by unnecessary charge sharing can be avoided.
Description
Technical Field
The present disclosure relates to display devices, and particularly to a display device and a driving method thereof.
Background
Liquid crystal display devices have advantages of lightness, thinness, low radiation, etc., and have gradually replaced Cathode Ray Tube (CRT) displays, becoming the mainstream of existing display devices. As the liquid crystal panel of the liquid crystal display device is larger and higher and the resolution is higher and higher, the power consumption of the driving circuit of the liquid crystal display device is also higher and higher. In order to reduce power consumption of a driving circuit of a display device, a charge sharing technique is applied to driving control of the display device. The charge sharing technology neutralizes the voltage on each data line by connecting each data line before driving the pixel units of the current row, and then the data driver loads the data voltage of each pixel unit of the current row into the corresponding data line. However, if the data voltage of the pixel units in the previous row is the same as or does not change much with the data voltage of the pixel units in the current row, the driving circuit performs charge sharing, which may increase the driving power consumption of the display device. As the power consumption of the display device is higher and higher, the existing charge sharing technology cannot meet the requirement.
Disclosure of Invention
The embodiment of the application provides a display device and a driving method thereof, so as to reduce the driving power consumption of the display device.
In a first aspect, an embodiment of the present application provides a display device. The display device comprises M data lines arranged at intervals, N gate lines arranged at intervals, a plurality of first switches electrically connected with the M data lines, and a control module. The N grid lines and the M data lines are crossed to define N rows M columns of pixel regions, and each pixel region is internally provided with one pixel unit. The plurality of first switches are used for communicating the M data lines. The control module is electrically connected with the control ends of the first switches respectively.
The control module is used for acquiring data voltages of two pixel units in an H-th row and an H-1-th row corresponding to each data line in a current frame before the pixel units in the H-th row are driven, and calculating a first difference value between the data voltages of the two pixel units.
The control module is further configured to count a first number of the first difference values exceeding a preset threshold range, and output a first control signal to turn on each of the first switches after the first number is greater than a first preset value and the H-1 th row of pixel units are driven, so as to connect the M data lines and enable the M data lines to perform charge sharing.
Or the control module is further used for calculating an average voltage of the data voltages of the pixel units in the H-1 th row and calculating a second difference value between the data voltage of each pixel unit in the H-1 th row and the average voltage; the control module is further configured to count a second number that the absolute value of the first difference corresponding to each pixel unit in the H-th row is greater than the absolute value of the corresponding second difference, and output a first control signal to turn on each first switch after the second number is greater than a second preset value and the pixel units in the H-1 th row are driven, so as to connect the M data lines, and enable the M data lines to perform charge sharing. Wherein H is an integer and 1< H < ═ N.
In one embodiment, the control module is further configured to output a second control signal to disconnect each of the first switches when the first number is less than or equal to the first preset value, so as to disconnect the M data lines; or, the control module is further configured to output a second control signal to disconnect each of the first switches when the second number is less than or equal to the second preset value, so as to disconnect the M data lines.
In one embodiment, the display device further includes a data driver and a plurality of second switches. The data driver is electrically connected with the M data lines respectively, and is used for inputting data voltages to the pixel units corresponding to the M data lines through the M data lines respectively. The M second switches correspond to the M data lines one by one, and the second switches are arranged between the corresponding data lines and the data driver.
In one embodiment, the control module is electrically connected to the control terminals of the M second switches, and the control module is further configured to output a third control signal to turn on each of the second switches when the M data lines perform charge sharing.
In one embodiment, after the H-th row of pixel units receive the turn-on signal and turn on, and before the data driver inputs the data voltage for the H-th row of pixel units, the control module is further configured to output a fourth control signal to turn off each of the second switches, and output the first control signal to turn on each of the first switches, so that each of the H-th row of pixel units performs charge sharing.
In one embodiment, the control module is further configured to output a second control signal to turn off each of the first switches and output a third control signal to turn on each of the second switches when the data driver inputs the data voltage to the H-th row of pixel units.
In a second aspect, embodiments of the present application provide a method for driving the display device of the first aspect. The driving method includes:
before the pixel units in the H-th row are driven, the data voltages of two pixel units in the H-th row and the H-1-th row corresponding to each data line in the current frame are obtained, and a first difference value between the data voltages of the two pixel units is calculated.
Counting a first number of the first difference values exceeding a preset threshold range, and conducting each first switch after the first number is larger than a first preset value and the H-1 th row of pixel units are driven, so as to connect the M data lines and enable the M data lines to carry out charge sharing.
Or, calculating an average voltage of the data voltages of the pixel units in the H-1 th row, and calculating a second difference value between the data voltage of each pixel unit in the H-1 th row and the average voltage; and counting a second number of the first difference values corresponding to the pixel units in the H-th row which are larger than the second number of the second difference values, and conducting the first switches after the second number is larger than a second preset value and the pixel units in the H-1 th row are driven, so that the M data lines are communicated, and the M data lines are subjected to charge sharing.
In one embodiment, when the first number is less than or equal to the first preset value, each first switch is turned off, so that the connection among the M data lines is broken; or when the second number is smaller than or equal to the second preset value, disconnecting each first switch, thereby disconnecting the M data lines.
In one embodiment, the display device further includes a data driver and M second switches, the data driver is electrically connected to the M data lines, the M second switches are in one-to-one correspondence with the M data lines, and the second switches are disposed between the corresponding data lines and the data driver. The driving method further includes: after the pixel units in the H-th row receive the turn-on signal and are turned on and before the data driver inputs the data voltage for the pixel units in the H-th row, each second switch is turned off, and each first switch is turned on, so that each pixel unit in the H-th row performs charge sharing.
In one embodiment, each of the second switches is turned on when the M data lines perform charge sharing; and when the data driver inputs data voltage to the pixel units in the H-th row, the first switches are disconnected and the second switches are connected.
Before the display device provided by the embodiment of the application drives the pixel units in the H-th row, whether each data line needs to be subjected to charge sharing is judged, and charge sharing is performed on each data line after a preset charge sharing condition is met, so that the purpose of reducing the driving power consumption of the display device can be achieved, and the power consumption increase caused by unnecessary charge sharing can be avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below.
Fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present application.
Fig. 2 is a schematic diagram of data voltages of a pixel unit in a display device.
Fig. 3 is another diagram of data voltages of a pixel unit in a display device.
Fig. 4 is a schematic structural diagram of a display device according to a second embodiment of the present application.
Fig. 5 is a schematic waveform diagram of signals on two adjacent gate lines of a display device according to a second embodiment of the present application.
Fig. 6 is a flowchart illustrating a driving method of the display device according to the present application.
Fig. 7 is a flowchart illustrating another driving method of the display device of the present application.
Fig. 8 is a flowchart illustrating a further driving method of the display device of the present application.
Description of the main elements
Gate driver 100
First gate line G1
Second gate line G2
Data driver 200
First data line D1
Second data line D2
Pixel region 400
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, and it is obvious that the described embodiments are only some embodiments in the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a display device 10a is provided according to a first embodiment of the present application. The display device 10a includes a gate driver 100, a data driver 200, a control module 300, N gate lines 110 arranged at intervals, and M data lines 210 arranged at intervals. Wherein M, N are each integers greater than 1. The N gate lines 110 and the M data lines 210 intersect to define N rows by M columns of pixel regions 400, a pixel unit 410 is disposed in each pixel region 400, and each pixel unit 410 is electrically connected to one gate line 110 and one data line 210 corresponding to the corresponding pixel region 400.
The gate driver 100 is electrically connected to the N gate lines 110, and the gate driver 100 is configured to input a conducting voltage to the M pixel units 410 in the nth row through the nth gate line 110, so as to turn on the M pixel units 410, so as to conduct a connection path between the M pixel units 410 and the M data lines 210. Wherein N is an integer, and 1< ═ N.
The data driver 200 is electrically connected to the M data lines 210, and the data driver 200 is configured to input data voltages to the n-th row of pixel units 410 through the M data lines 210, so as to drive the n-th row of pixel units 410.
The display device 10a further includes a plurality of first switches 310 electrically connected to the M data lines 210, the plurality of first switches 310 being used to communicate with the M data lines 210. In the first embodiment, the first switch 310 is a normally open switch. The first switch 310 may be a transistor, a MOS transistor, or the like. The control module 300 is electrically connected to the control terminals of the plurality of first switches 310, respectively. The control module 300 is configured to turn on the plurality of first switches 310 before the H-th row of pixel units 410 is driven to connect the M data lines 210, so as to neutralize the voltage on each data line 210, thereby implementing charge sharing between the M data lines 210 and achieving the purpose of reducing the power consumption of the driving circuit of the display device 10 a. Wherein H is an integer and 1< H < ═ N. However, the charge sharing between the M data lines 210 directly before the H-th row of pixel cells 410 is driven does not always achieve the purpose of reducing the power consumption of the driving circuit of the display device 10 a.
Specifically, referring to fig. 2, the driving principle of the display device 10a of the present application will be described by taking the display device 10a including two gate lines G1 and G2, two data lines D1 and D2, and four pixel cells P1-P4 as an example. It is understood that in other embodiments, the display device 10a may include more gate lines 110, data lines 210 and pixel units 410.
As shown in fig. 2, the pixel cell P1 and the pixel cell P2 are located in the 1 st row and are electrically connected to the first gate line G1; the pixel cell P3 and the pixel cell P4 are located in the 2 nd row and are electrically connected to the second gate line G2. The pixel unit P1 and the pixel unit P3 are located at the 1 st column and are electrically connected to the first data line D1; the pixel cell P2 and the pixel cell P4 are located at the 2 nd column and are electrically connected to the second data line D2.
After the driving of the pixel cells P1 and P2 of the 1 st row is completed and before the pixel cells P3 and P4 of the 2 nd row are driven, in one case, as shown in fig. 2, it is assumed that the data voltage loaded in the pixel cell P1 is 4V, the data voltage loaded in the pixel cell P2 is 8V, the data voltage loaded by the pixel cell P3 is 8V, and the data voltage loaded by the pixel cell P4 is 4V. After the driving of the pixel cells P1 and P2 of the 1 st row is completed, the voltage on the first data line D1 is maintained at 4V, and the voltage on the second data line D2 is maintained at 8V. After the pixel cells P1 and P2 in row 1 are completely driven, if no charge sharing is performed between the first data line D1 and the second data line D2, the data driver 200 needs to increase the voltage on the first data line D1 from 4V to 8V and decrease the voltage on the second data line D2 from 8V to 4V when driving the pixel cells P3 and P4 in row 2. That is, the voltage variation values in the first data line D1 and the second data line D2 are both 4V, and the corresponding power consumption is high.
If the first data line D1 and the second data line D2 are charge-shared, the voltages on the first data line D1 and the second data line D2 are both 6V, so that the data driver 200 only needs to increase the voltage on the first data line D1 from 6V to 8V and decrease the voltage on the second data line D2 from 6V to 4V when driving the pixel cells P3 and P4 in row 2. That is, the voltage in the first data line D1 and the second data line D2 each have a variation value of 2V, and the corresponding power consumption is relatively low.
Comparing the two driving schemes, if the first data line D1 and the second data line D2 are charge-shared before the pixel cells P3 and P4 in row 2 are driven, when the data driver 200 inputs the data voltages to be applied to the pixel cells P3 and P4 to the first data line D1 and the second data line D2, respectively, the variation values of the voltages in the first data line D1 and the second data line D2 are reduced, and the variation value of the voltages is reduced from 4V to 2V, so that the driving power consumption of the data driver 200 can be reduced.
In another case, as shown in fig. 3, it is assumed that the data voltage loaded in the pixel cell P1 is 4V, the data voltage loaded in the pixel cell P2 is 8V, the data voltage loaded in the pixel cell P3 is 4V, and the data voltage loaded in the pixel cell P4 is 8V. After the driving of the unit pixels P1 and P2 of the row 1 is completed, the voltage on the first data line D1 is maintained at 4V, and the voltage on the second data line D2 is maintained at 8V. After the driving of the pixel cells P1 and P2 in the row 1 is completed, if no charge sharing is performed between the first data line D1 and the second data line D2, the data driver 200 may directly drive the pixel cells P3 and P4 in the row 2 without changing the voltages on the first data line D1 and the second data line D2 when driving the pixel cells P3 and P4 in the row 2. That is, the voltage in the first data line D1 and the second data line D2 both have a variation value of 0, and the corresponding power consumption is relatively low.
When the first data line D1 and the second data line D2 are charge-shared, the voltages on the first data line D1 and the second data line D2 both become 6V, and the data driver 200 needs to reduce the voltage on the first data line D1 from 6V to 4V and increase the voltage on the second data line D2 from 6V to 8V when driving the pixel cells P3 and P4 in row 2. That is, the voltage in the first data line D1 and the second data line D2 both have a variation value of 2V, and the corresponding power consumption is relatively high.
Comparing the two driving schemes, if the first data line D1 and the second data line D2 are charge-shared before the pixel cells P3 and P4 in the row 2 are driven, when the data driver 200 inputs the data voltages to the first data line D1 and the second data line D2, which need to be loaded by the pixel cells P3 and P4, respectively, the variation values of the voltages in the first data line D1 and the second data line D2 are increased, and the variation value of the voltages is increased from 0V to 2V, so that the driving power consumption of the data driver 200 is increased.
In order to avoid the increase of the driving power consumption caused by the charge sharing of the M data lines 210, in an embodiment, the control module 300 is configured to obtain the data voltages of each data line 210 and the two pixel units 410 in the H and H-1 rows in the current frame before the pixel units 410 in the H row are driven, and calculate a first difference between the data voltages of the two pixel units 410.
The control module 300 is further configured to count a first number of the first difference values exceeding a preset threshold range. The preset threshold range may be specifically set according to actual requirements, and is not specifically limited in this application, for example, the preset threshold range may be set to-1V to + 1V.
The control module 300 is further configured to output a first control signal to turn on each of the first switches 310 after the first number is greater than the first preset value and the pixel units 410 in the H-1 th row are driven, so as to connect the M data lines 210, and enable the M data lines 210 to perform charge sharing, so as to reduce power consumption of the driving circuit of the display device 10 a. The first preset value may be specifically set according to actual requirements and the specific number of the pixel units 410 in each row, which is not specifically limited in this application.
In the embodiment, the control module 300 is further configured to output a second control signal to open each first switch 310 when the first number is less than or equal to the first preset value, so as to disconnect the M data lines 210, so as to avoid a situation that driving power consumption is increased due to charge sharing of the M data lines.
It is understood that the control module 300 also consumes a certain amount of power when turning on each of the first switches 310, and therefore, the power consumption reduced after the first data line D1 and the second data line D2 are charge-shared is less than the power consumption required by the control module 300 to turn on each of the first switches 310, which also results in an increase in the driving power consumption of the data driver 200. For example, when the difference between the data voltage of the pixel cell P1 and the data voltage of the pixel cell P3 is too small, and the difference between the data voltage of the pixel cell P2 and the data voltage of the pixel cell P4 is too small, the power consumption reduced by charge sharing the first data line D1 and the second data line D2 is less. In the present application, the first difference is compared with the preset threshold range, and when the first difference exceeds the preset threshold range, it indicates that the power consumption can be reduced after the charge sharing is performed, so that the control module 300 can more accurately determine whether the data line 210 needs to perform the charge sharing by comparing the first difference with the preset threshold range. The preset threshold range can be specifically set according to actual requirements, and the application is not specifically limited.
Further, if the charge sharing is performed on each data line 210 even when the data voltages of only a few data lines 210 corresponding to the two pixel units 410 in the H-th row and the H-1 th row are different, the power consumption is also increased. Before driving each pixel unit 410 in the H-th row, the control module 300 in the present application determines whether the number of the data lines 210 that need to perform charge sharing is greater than a first preset value, so as to better reduce the driving power consumption of the display device 10 a. The preset threshold range may be specifically set according to actual requirements and the specific number of the first switches 310, and is not specifically limited in this application.
Specifically, continuing with the example of the structure shown in fig. 2 and 3, assume that the preset threshold range is-1V to +1V, and the first preset value is set to 1. For the case shown in fig. 2, the first difference between the data voltage loaded in the pixel cell P1 and the data voltage to be loaded in the pixel cell P3 is 4V, the first difference between the data voltage loaded in the pixel cell P2 and the data voltage to be loaded in the pixel cell P4 is-4V, both of the first differences exceed the preset threshold range, and thus the first number is 2, which is greater than the first preset value, so that the first data line D1 and the second data line D2 are charge-shared before the pixel cells P3 and P4 in the 2 nd row are driven, and the driving power consumption of the data driver 200 can be reduced.
For the case shown in fig. 3, the first difference between the data voltage loaded in the pixel cell P1 and the data voltage to be loaded in the pixel cell P3 is 0V, the first difference between the data voltage loaded in the pixel cell P2 and the data voltage to be loaded in the pixel cell P4 is also 0V, both of the first differences are within the preset threshold range, and thus the first number is 0, which is smaller than the first preset value, so that no charge sharing is performed between the first data line D1 and the second data line D2 before the pixel cell P3 and the pixel cell P4 are driven, and an increase in power consumption of the data driver 200 can be avoided.
To sum up, in the embodiment, before the data driver 200 drives the pixel unit 410 in the H-th row, a first difference between the data voltage loaded in the pixel unit 410 in the H-1 th row and the data voltage to be loaded in the pixel unit 410 in the corresponding column in the H-th row is calculated, a first number of the first difference exceeding a preset threshold range is counted, and when the first number is greater than a first preset value, the data lines 210 are charge-shared, so that the driving power consumption of the data driver 200 can be reduced; when the first number is less than or equal to the first preset value, the charge sharing is not performed on each data line 210, and the increase of the driving power consumption of the data driver 200 due to the charge sharing performed on the data lines 210 can be avoided.
In another embodiment, the control module 300 is configured to, before driving the H-th row of pixel units 410, obtain data voltages of two pixel units 410 in the H-th row and the H-1 th row corresponding to each data line 210 in the current frame, and count a first difference between the data voltages of the two pixel units 410.
The control module 300 is further configured to calculate an average voltage of the data voltages of the pixel cells 410 in the H-1 th row, and calculate a second difference between the data voltages of the pixel cells 410 in the H-1 th row and the average voltage.
The control module 300 is further configured to count a second number that the absolute value of the first difference corresponding to each pixel unit 410 in the H-th row is greater than the absolute value of the second difference, and output a first control signal to turn on each first switch 310 after the second number is greater than a second preset value and the pixel units 410 in the H-1 th row are driven, so as to connect the M data lines 210, so that the M data lines 210 perform charge sharing, thereby reducing the power consumption of the driving circuit of the display device 10 a. When the absolute value of the first difference is greater than the absolute value of the second difference, indicating that the data driver 200 performs charge sharing on each data line 210 when inputting a voltage to each data line 210, the variation value of the voltage in each data line 210 may be reduced, and thus, the driving power consumption of the data driver 200 may be reduced. The second preset value may be specifically set according to actual requirements and the specific number of the pixel units 410 in each row, which is not specifically limited in this application.
In the another embodiment, the control module 300 is further configured to output a second control signal to disconnect each first switch 310 when the second number is less than or equal to the second preset value, so as to disconnect the M data lines 210, so as to avoid a situation that driving power consumption is increased due to charge sharing of the M data lines.
It is understood that the control module 300 consumes a certain amount of power when turning on each of the first switches 310, and therefore, if the absolute value of the first difference corresponding to only a few data lines 210 is greater than the absolute value of the second difference, charge sharing is performed on each data line 210, which also results in an increase in power consumption. Before driving each pixel unit 410 in the H-th row, the control module 300 in the present application determines whether the number of the data lines 210 that need to be charge-shared is greater than the second preset value, so as to reduce the driving power consumption of the display device 10a better.
Specifically, continuing with the example of the structures shown in fig. 2 and 3, for the case shown in fig. 2, the first difference between the data voltage already loaded in pixel cell P1 and the data voltage that needs to be loaded into pixel cell P3 is 4V, and the first difference between the data voltage already loaded in pixel cell P2 and the data voltage that needs to be loaded into pixel cell P4 is-4V. The average voltage of the data voltages loaded in the pixel cells P1 and P2 is 6V. As such, it is required that the second difference between the data voltage and the average voltage loaded to the pixel cell P3 is-2V, and the absolute value (4V) of the first difference between the pixel cells P3 and P1 is greater than the absolute value (2V) of the second difference between the pixel cell P3 and the average voltage; it is required that the second difference between the average voltage and the data voltage loaded to the pixel cell P4 is 2V, the absolute value (4V) of the first difference between the pixel cells P4 and P2 is greater than the absolute value (2V) of the second difference between the pixel cell P4 and the average voltage, and thus the second number is 2, which is greater than the second preset value, and thus the first data line D1 and the second data line D2 are charge-shared before the pixel cells P3 and P4 of the 2 nd row are driven, so that the driving power consumption of the data driver 200 can be reduced.
For the case shown in fig. 3, the first difference between the data voltage already loaded in the pixel cell P1 and the data voltage that needs to be loaded into the pixel cell P3 is 0V, and the first difference between the data voltage already loaded in the pixel cell P2 and the data voltage that needs to be loaded into the pixel cell P4 is 0V. The average voltage of the data voltages loaded in the pixel cells P1 and P2 is 6V. As such, it is required that the second difference between the data voltage loaded to the pixel cell P3 and the average voltage is 2V, and the absolute value (0V) of the first difference corresponding to the pixel cells P3 and P1 is smaller than the absolute value (2V) of the second difference between the pixel cell P3 and the average voltage; it is required that the second difference between the average voltage and the data voltage loaded to the pixel cell P4 is-2V, the absolute value (0V) of the first difference between the average voltage and the corresponding pixel cells P4 and P2 is smaller than the absolute value (2V) of the second difference between the average voltage and the pixel cells P4, and thus the second number is 0 and smaller than the second preset value, and thus the first data line D1 and the second data line D2 do not perform charge sharing before the pixel cells P3 and P4 of the 2 nd row are driven, and it is possible to avoid an increase in power consumption of the data driver 200 due to the charge sharing between the first data line D1 and the second data line D2.
As can be seen from the above, in the another embodiment, before the data driver 200 drives the pixel unit in the H-th row, a first difference between the data voltage loaded in the pixel unit 410 in the H-1 th row and the data voltage to be loaded in the pixel unit 410 in the corresponding column in the H-th row is calculated, an average voltage of the data voltages of the pixel units 410 in the H-1 th row is calculated, a second difference between the data voltage of each pixel unit 410 in the H-th row and the average voltage is calculated, a second number that an absolute value of the first difference corresponding to each pixel unit 410 in the H-th row is greater than an absolute value of the corresponding second difference is counted, and when the second number is greater than a second preset value, the data lines 210 are charge-shared, so as to reduce the driving power consumption of the data driver 200; when the second number is less than or equal to the second preset value, the charge sharing is not performed on each data line 210, and it is possible to avoid an increase in driving power consumption of the data driver 200 due to the charge sharing performed on each data line 210.
Referring to fig. 4, a display device 10b is provided according to a second embodiment of the present application. The display device 10b provided in the second embodiment has a similar structure to the display device 10a provided in the first embodiment, except that the display device 10b further includes M second switches 320. The M second switches 320 correspond to the M data lines 210 one to one. The second switches 320 are disposed between the corresponding data lines 210 and the data driver 200. The control module 300 is also electrically connected to the control terminals of the plurality of second switches 320, respectively. The control module 300 is configured to output a third control signal to turn on the second switch 320 when the data driver 200 inputs the data voltage to the pixel unit 410 and when the M data lines 210 perform charge sharing, so as to turn on the connection path between the data driver 200 and the M data lines 210. Wherein the second switch 320 is a normally closed switch. The second switch 320 may be a transistor, a MOS transistor, or the like.
The control module 300 is further configured to output a fourth control signal to turn off each second switch 320 and output a first control signal to turn on each first switch 310 after the gate driver 100 inputs the on-voltage to the H-th row of pixel units 410 and before the data driver 200 inputs the data voltage to the M pixel units 410 corresponding to the M data lines 210 through the M data lines 210, so that each pixel unit 410 in the H-th row performs charge sharing.
Referring to fig. 5, fig. 5 is a schematic waveform diagram of signals on two adjacent gate lines of a display device 10b according to a second embodiment of the present application. The signal G11 is an output signal applied to the H-1 th gate line 110 by the gate driver 100, and the signal G22 is an output signal applied to the H-th gate line 110 by the gate driver 100. The high-level signal is a turn-on signal, that is, the gate driver 100 inputs a turn-on voltage to the corresponding gate line 110 to turn on the connection path between each pixel unit 410 corresponding to the corresponding gate line 110 and the corresponding data line 210. The low level signal is an off signal, that is, the gate driver 100 inputs an off voltage to the corresponding gate line 110 to disconnect the connection path between each pixel unit 410 corresponding to the corresponding gate line 110 and the corresponding data line 210.
As shown in fig. 5, at time t1, row H-1 pixel cell 410 is driven to completion. It is understood that when the pixel units 410 of the H-1 th row are driven, the respective second switches 320 are in the on state and the respective first switches 310 are in the off state.
In the period t1-t2, the signal on the H-th gate line 110 is a low-level signal, and thus the signal received by the pixel cell 410 in the H-th row is a low-level signal, and the pixel cell 410 in the H-th row is in an off state. When it is determined that the M data lines 210 need to be charge-shared, the control module 300 outputs the first control signal to turn on each first switch 310, and continues to output the third control signal to turn on each second switch 320, so as to turn on the connection path between the data driver 200 and each data line 210, thereby enabling the M data lines 210 to be charge-shared. The control module 300 further outputs a second control signal to turn off the first switch 310 to disconnect the connection path between the M data lines 210 after the M data lines 210 complete the charge sharing, and continues to output a third control signal to turn on each second switch 320 to turn on the connection path between the data driver 200 and each data line 210.
If the control module 300 determines that the M data lines 210 do not need to be charge-shared, the control module 300 outputs a second control signal to turn off the first switches 310 to disconnect the connection paths between the M data lines 210, and outputs a third control signal to turn on the second switches 320 to turn on the connection paths between the data driver 200 and the data lines 210.
In the period t2-t3, the signal on the H-th gate line 110 is a high level signal, so the signal received by the H-th row of pixel cells 410 is a high level signal, and the H-th row of pixel cells 410 is in a conducting state, i.e., the connection path between the H-th row of pixel cells 410 and the corresponding data line 210 is in a conducting state. The control module 300 outputs a fourth control signal to open each of the second switches 320 to open the connection path between the data driver 200 and each of the data lines 210. The control module 300 further outputs a first control signal to turn on each first switch 310 to turn on the connection path between the M data lines 210, so as to connect each pixel unit 410 in the H-th row, thereby enabling each pixel unit 410 to perform charge sharing.
During the period t3-t4, the control module 300 outputs a second control signal to turn off each first switch 310 to disconnect the connection path between the M data lines 210, and outputs a third control signal to turn on each second switch 320 to turn on the connection path between the data driver 200 and each data line 210, so that the data driver 200 can load the corresponding data voltage for each pixel unit 410 of the H-th row through each data line 210.
In the present embodiment, the data driver 200 performs charge sharing on each pixel unit 410 before driving each pixel unit 410 in the H-th row, so that the original data voltage in the pixel unit 410 is neutralized to be near the common voltage VCOM, thereby reducing the variation value of the data voltage in each pixel unit 410 when the data driver 200 loads a new data voltage for each pixel unit 410, and further reducing the driving power consumption of the data driver 200.
Referring to fig. 6, fig. 6 is a flowchart of a driving method of the display device provided in the present application, the driving method being used for driving the display device 10 a. The driving method includes the steps of:
in step 101, before driving the pixel units 410 in the H-th row, the data voltages of each data line 210 and the two pixel units 410 in the H-th row and the H-1 th row are obtained, and a first difference between the data voltages of the two pixel units 410 is calculated.
And 102, counting a first number of the first difference values exceeding a preset threshold range.
And 103, judging whether the first quantity is greater than a first preset value. If the first number is greater than the first preset value, step 104 is executed. If the first number is less than or equal to the first preset value, step 106 is executed.
In step 104, it is determined whether the driving of the pixel units 410 of the H-1 th row is completed. If the driving of the pixel units 410 of the H-1 th row has been completed, step 105 is performed. If the driving of the pixel units 410 in the H-1 th row is not completed, the process returns to step 104.
In step 105, before the gate driver 100 inputs the turn-on signal to the H-th row of pixel units 410, each first switch 310 is turned on to connect each data line 210, so that each data line 210 performs charge sharing.
In step 106, the first switches 310 are opened to disconnect the data lines 210.
Referring to fig. 7, fig. 7 is a flowchart illustrating another driving method of the display device according to the present application, the driving method being used for driving the display device 10 a. The driving method includes the steps of:
in step 201, before driving the pixel units 410 in the H-th row, the data voltages of each data line 210 and the two pixel units 410 in the H-th row and the H-1 th row are obtained, and a first difference between the data voltages of the two pixel units 410 is calculated.
In step 202, the average voltage of the data voltages of the pixel units 410 of the H-1 th row is calculated.
In step 203, a second difference between the data voltage of each pixel unit 410 in the H-th row and the average voltage is calculated.
In step 206, it is determined whether the driving of the pixel units 410 in the H-1 th row is completed. If the driving of the pixel units 410 of the H-1 th row is completed, step 207 is performed. If the driving of the pixel units 410 in the H-1 th row is not completed, the process returns to step 206.
In step 207, before the gate driver 100 inputs the turn-on signal to the H-th row of pixel units 410, each first switch 310 is turned on to connect each data line 210, so that each data line 210 performs charge sharing.
In step 208, the first switches 310 are opened to disconnect the data lines 210.
Referring to fig. 8, fig. 8 is a flowchart of a driving method of the display device provided in the present application, the driving method is used for driving the display device 10 b. The driving method includes the steps of:
in step 301, after the pixel units 410 in the H-1 th row are completely driven, it is determined whether charge sharing is required between the data lines 210. If no charge sharing is required between the data lines 210, step 302 is performed. If charge sharing is required between the data lines 210, step 303 is performed.
For details of the specific technique for determining whether charge sharing is required between the data lines 210 in step 301, please refer to the above detailed description of the driving method shown in fig. 6 or fig. 7, which is not described herein again. Step 302 is performed if charge sharing is required between the data lines 210, and step 303 is performed if charge sharing is not required between the data lines 210.
In step 302, after the gate driver 100 inputs the on voltage to the H-th row of pixel units 410, the second switches 320 are turned off to disconnect the connection paths between the data driver 200 and the data lines 210, and the first switches 310 are turned on to connect the connection paths between the data lines 210, so that the pixel units 410 in the H-th row perform charge sharing. After step 302 is executed, the flow goes to step 305.
In step 303, the second switches 320 are turned on to connect the connection paths between the data driver 200 and the data lines 210, and the first switches 310 are turned on to connect the connection paths between the data lines 210, so that the data lines 210 perform charge sharing.
In step 304, after the gate driver 100 inputs the on voltage to the H-th row of pixel units 410, the second switches 320 are turned off to disconnect the connection paths between the data driver 200 and the data lines 210, so that the pixel units 410 in the H-th row share charges.
In step 305, the first switches 310 are turned off to disconnect the connection paths between the data lines 210, and the second switches 320 are turned on to connect the data driver 200 and the data lines 210, so that the data driver 200 loads the corresponding data voltages to the pixel units 410 in the H-th row.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A display device, comprising:
m data lines arranged at intervals;
the pixel structure comprises N grid lines which are arranged at intervals, wherein the N grid lines and the M data lines are crossed to define N rows by M columns of pixel regions, each pixel region is internally provided with a pixel unit, and M, N are integers which are more than 1;
a plurality of first switches electrically connected to the M data lines, the plurality of first switches being configured to communicate with the M data lines; and
the control module is used for acquiring data voltages of two pixel units in an H-th row and an H-1-th row corresponding to each data line in a current frame before the pixel units in the H-th row are driven, and calculating a first difference value between the data voltages of the two pixel units;
the control module is further configured to count a first number of the first difference values exceeding a preset threshold range, and output a first control signal to turn on each of the first switches after the first number is greater than a first preset value and the H-1 th row of pixel units are driven, so as to connect the M data lines and enable the M data lines to perform charge sharing;
or the control module is further used for calculating an average voltage of the data voltages of the pixel units in the H-1 th row and calculating a second difference value between the data voltage of each pixel unit in the H-1 th row and the average voltage; the control module is further configured to count a second number that an absolute value of the first difference corresponding to each pixel unit in the H-th row is greater than an absolute value of the corresponding second difference, and output a first control signal to turn on each first switch after the second number is greater than a second preset value and the pixel units in the H-1 th row are driven, so as to connect the M data lines and enable the M data lines to perform charge sharing;
wherein H is an integer and 1< H < ═ N.
2. The display device according to claim 1, wherein the control module is further configured to output a second control signal to open each of the first switches when the first number is less than or equal to the first preset value, so as to disconnect the M data lines;
or, the control module is further configured to output a second control signal to disconnect each of the first switches when the second number is less than or equal to the second preset value, so as to disconnect the M data lines.
3. The display device according to claim 2, further comprising:
the data driver is electrically connected with the M data lines respectively and used for inputting data voltages to the pixel units corresponding to the M data lines through the M data lines respectively; and
m second switches, corresponding to the M data lines one by one, the second switches are arranged between the corresponding data lines and the data driver.
4. The display device according to claim 3, wherein the control module is electrically connected to the control terminals of the M second switches, and the control module is further configured to output a third control signal to turn on each of the second switches when the M data lines perform charge sharing.
5. The display device according to claim 4, wherein after the H-th row of pixel units receives the turn-on signal and is turned on, and before the data driver inputs the data voltage for the H-th row of pixel units, the control module is further configured to output a fourth control signal to turn off each of the second switches, and output the first control signal to turn on each of the first switches, so that each of the H-th row of pixel units performs charge sharing.
6. The display device according to claim 5, wherein the control module is further configured to output a second control signal to turn off each of the first switches and output the third control signal to turn on each of the second switches when the data driver inputs the data voltage to the pixel units in the H-th row.
7. A driving method of a display device for driving the display device according to any one of claims 1 to 6, the driving method comprising:
before the pixel units in the H-th row are driven, acquiring data voltages of two pixel units in the H-th row and the H-1-th row corresponding to each data line in a current frame, and calculating a first difference value between the data voltages of the two pixel units;
counting a first number of the first difference values exceeding a preset threshold range, and conducting each first switch after the first number is larger than a first preset value and the H-1 th row of pixel units are driven, so as to connect the M data lines and enable the M data lines to carry out charge sharing;
or, calculating an average voltage of the data voltages of the pixel units in the H-1 th row, and calculating a second difference value between the data voltage of each pixel unit in the H-th row and the average voltage; and counting a second number of the first difference values corresponding to the pixel units in the H-th row which are larger than the second number of the second difference values, and conducting the first switches after the second number is larger than a second preset value and the pixel units in the H-1 th row are driven, so that the M data lines are communicated, and the M data lines are subjected to charge sharing.
8. The driving method according to claim 7, further comprising:
when the first number is smaller than or equal to the first preset value, disconnecting each first switch, thereby disconnecting the M data lines;
or when the second quantity is less than or equal to the second preset value, disconnecting each first switch, thereby disconnecting the M data lines.
9. The driving method according to claim 7, wherein the display device further includes a data driver and M second switches, the data driver being electrically connected to the M data lines, respectively, the M second switches corresponding to the M data lines one to one, the second switches being disposed between the corresponding data lines and the data driver;
the driving method further includes:
after the pixel units in the H-th row receive the turn-on signal and are turned on and before the data driver inputs the data voltage for the pixel units in the H-th row, each second switch is turned off, and each first switch is turned on, so that each pixel unit in the H-th row performs charge sharing.
10. The driving method according to claim 9, further comprising:
when the M data lines share the charges, each second switch is conducted; and
and when the data driver inputs data voltage to the pixel units in the H-th row, each first switch is disconnected and each second switch is connected.
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