CN115202087B - Display panel driving method and display device - Google Patents
Display panel driving method and display device Download PDFInfo
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- CN115202087B CN115202087B CN202210596848.XA CN202210596848A CN115202087B CN 115202087 B CN115202087 B CN 115202087B CN 202210596848 A CN202210596848 A CN 202210596848A CN 115202087 B CN115202087 B CN 115202087B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 10
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- 239000003990 capacitor Substances 0.000 description 6
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136286—Wiring, e.g. gate line, drain line
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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
-
- 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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
-
- 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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
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- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Nonlinear Science (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The application discloses a driving method of a display panel and a display device, wherein the driving method comprises the following steps: in the scanning period of the current frame time, the pixel active switch corresponding to each row of scanning lines is conducted row by row, and the pixel voltage on the data line is transmitted to the corresponding pixel respectively; after the scanning period in the previous frame time is ended, when the idle period in the previous frame time is entered, all the pixel active switches are in an off state, a preset data signal is provided for the data line, the leakage current of the pixel active switches in the off state is increased, and the preset data signal charges at least one pixel. The problem that the leakage current of the pixel active switch of the liquid crystal display causes flicker in the idle period within one frame time is solved by the scheme.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a driving method of a display panel and a display device.
Background
The TFT-LCD (Thin Film Transistor Liquid Crystal Display) LCD has the advantages of low power consumption, high image quality, low cost and the like, and becomes the dominant technology in the field of flat panel display. The liquid crystal display surface consists of a display panel and a backlight module, wherein the display panel consists of an array substrate with a thin film transistor, a color film substrate and middle liquid crystal; however, with the advent of the high frame rate era, the lcd can also realize high and low frame rate display and switching display. However, taking a liquid crystal display as an example, in a scanning period within one frame time, a pixel voltage on a data line charges each pixel, in an idle period within one frame, the data line outputs a voltage with zero gray scale, and because of the problem of leakage current of an active switch of the pixel, at this time, the charge of the pixel flows onto the data line, so that the pixel leaks, the voltage drops, the screen brightness drops, and the flicker problem occurs.
Therefore, how to solve the problem of flicker caused by leakage current in the pixel active switch of the liquid crystal display is a technical problem to be solved in the art.
Disclosure of Invention
The application aims to provide a driving method of a display panel and a display device, so as to solve the problem that a pixel active switch of a liquid crystal display causes flickering due to leakage current in an idle period within one frame time.
The application discloses a driving method of a display panel, which comprises the following steps:
in the scanning period of the current frame time, the pixel active switch corresponding to each row of scanning lines is conducted row by row, and the pixel voltage on the data line is transmitted to the corresponding pixel respectively;
after the scanning period in the previous frame time is ended, when the idle period in the previous frame time is entered, all the pixel active switches are in an off state, a preset data signal is provided for the data line, the leakage current of the pixel active switches in the off state is increased, and the preset data signal charges at least one pixel.
Optionally, the preset data signal corresponds to a gray level of 245 to 255 or-245 to-255.
Optionally, in the scanning period in the previous frame time, the pixel active switch corresponding to each row of scanning lines is turned on row by row, and the step of transmitting the pixel voltage on the data line to the corresponding pixel respectively further includes:
in the scanning period, a preset cut-off voltage is input to the control end of the pixel active switch, so that each row of scanning lines corresponds to the pixel active switch to be kept in a cut-off state after being conducted;
after the scanning period in the current frame time is ended, when the scanning period in the current frame time is started to enter an idle period in the current frame time, all the pixel active switches are in an off state, a preset data signal is provided for the data line, the leakage current of the pixel active switches in the off state is increased, and the step of charging at least one pixel by the preset data signal comprises the following steps:
after the scanning period in the current frame time is ended, when entering the idle period in the current frame time, providing preset data signals for all data lines;
controlling the off-voltage bias of the control end of the pixel active switch, and inputting the off-voltage after the bias to the control end of the pixel active switch so as to increase the leakage current of the pixel active switch in the off state;
charging all pixels by preset data signals on the data line;
wherein the cutoff voltage is a negative supply voltage.
Optionally, the biased cutoff voltage is 0.5-5V lower than the preset cutoff voltage.
Optionally, in the scanning period in the previous frame time, the pixel active switch corresponding to each row of scanning lines is turned on row by row, and the step of transmitting the pixel voltage on the data line to the corresponding pixel respectively includes:
judging the refresh rate of the display panel;
when the refresh rate of the display panel is smaller than or equal to a preset refresh rate, executing the step of conducting pixel active switches corresponding to each row of scanning lines row by row in each frame in the scanning period in the current frame time, respectively transmitting pixel voltages on the data lines to corresponding pixels, and when entering an idle period in the current frame time after the scanning period in the current frame time is finished, all the pixel active switches are in an off state, providing preset data signals for the data lines, increasing leakage currents of the pixel active switches in the off state, and charging at least one pixel by the preset data signals;
when the refresh rate of the display panel is greater than the preset refresh rate, after every preset frame number, executing the step of conducting the pixel active switches corresponding to each row of scanning lines row by row in the scanning period in the current frame time in the next frame, respectively transmitting the pixel voltage on the data lines to the corresponding pixels, and when entering the idle period in the current frame time after the scanning period in the current frame time is finished, all the pixel active switches are in an off state, providing preset data signals for the data lines, increasing the leakage current of the pixel active switches in the off state, and charging at least one pixel by the preset data signals.
Optionally, the preset refresh rate is 60HZ.
Optionally, after the scanning period in the previous frame time is ended and the idle period in the previous frame time is entered, all the pixel active switches are in an off state, a preset data signal is provided to the data line, and the leakage current of the pixel active switches in the off state is increased, where the step of charging at least one pixel by the preset data signal includes:
and before the idle period in the current frame time is ended, restoring the cut-off voltage in advance by a preset time, inputting the cut-off voltage to the control end of the pixel active switch, and stopping providing the preset data signal to the data line.
The application also discloses a display device, which comprises: the display panel comprises a plurality of data lines, a plurality of scanning lines, a plurality of pixel active switches and a plurality of pixels, wherein the pixel active switches are arranged in a one-to-one correspondence manner, the control end of each pixel active switch is connected with the corresponding scanning line, the input end of each pixel active switch is connected with the corresponding data line, and the output end of each pixel active switch is connected with a pixel; the driving circuit comprises a controller, a scanning driver and a data driver, wherein the data driver provides pixel voltages for the data lines, the scanning driver provides scanning signals for the scanning lines, the controller controls the data driver to provide pixel voltages for the data lines in a scanning period, and controls the data driver to provide preset data signals for the data lines in an idle period; the controller controls the scanning driver to provide scanning signals for the scanning lines in a scanning period, and controls the scanning driver to increase leakage current of the pixel active switch in an off state in an idle period.
Optionally, the driving circuit further includes a power supply circuit, the controller controls the power supply circuit to provide a scan signal and a preset cut-off voltage for the scan driver in the scan period, and controls the power supply circuit to provide a biased cut-off voltage for the scan driver in the idle period, wherein the biased cut-off voltage is lower than the preset cut-off voltage by 0.5-5V.
Optionally, the controller is a timing controller, the timing controller determines a refresh rate of the display panel, and when the timing controller determines that the display panel is at a high refresh rate, after each preset frame time interval, the controller controls the scan driver to increase the leakage current of the pixel active switch in the off state in an idle period, and controls the data driver to provide a preset data signal for the data line; and when the time schedule controller judges that the display panel is in a low refresh rate, in each frame time, controlling the scanning driver to increase the leakage current of the pixel active switch in a cut-off state in an idle period, and controlling the data driver to provide a preset data signal for the data line.
Since the pixel active switch still has leakage current in the off state, when the voltage on the data line is 0, the leakage current will flow from the pixel electrode to the data line, resulting in power loss of the pixel electrode, and the pixel voltage cannot be maintained. Therefore, the application provides the preset data signal for the data line in the idle period, so that the leakage current of the pixel active switch in the cut-off state flows from the data line to the pixel electrode, and the preset data signal can charge at least one pixel, and firstly, the problem of pixel electric quantity loss caused by the influence of the leakage current of the pixel active switch in the idle period is avoided. And secondly, the leakage current of the pixel active switch in the idle period is increased, so that the preset data signal on the data line charges more charge to the pixel in the idle period, and further other influences, such as parasitic capacitance leakage, of the pixel in the idle period are counteracted. Under normal conditions, the leakage current of the pixel active switch in the off state is smaller, even if the preset data signal of the data line is adopted to charge the pixel, the charging quantity is very limited at the moment, but the application has another important point that the leakage current of the pixel active switch in the off state is increased in an idle period, so that the charging quantity of the pixel in the period is increased. Thereby improving the problem of flicker caused by leakage current and leakage current of other parasitic capacitances in the idle period of the pixel active switch of the liquid crystal display in one frame time.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is evident that the figures in the following description are only some embodiments of the application, from which other figures can be obtained without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a schematic step diagram of a driving method of a display panel according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of timing control of a first embodiment of the present application;
FIG. 3 is a schematic diagram showing steps of a driving method of a first display panel according to a first embodiment of the present application;
FIG. 4 is a schematic diagram showing steps of a driving method of a second display panel according to the first embodiment of the present application;
FIG. 5 is a schematic diagram showing steps of a driving method of a third display panel according to a first embodiment of the present application;
fig. 6 is a schematic view of a display device according to a second embodiment of the present application.
10, a display device; 100. a display panel; 110. a data line; 120. a scanning line; 130. a pixel active switch; 140. a pixel; 200. a driving circuit; 210. a controller; 211. a timing controller; 220. a scan driver; 230. a data driver; 240. a power supply circuit.
Detailed Description
It is to be understood that the terminology used herein, the specific structural and functional details disclosed are merely representative for the purpose of describing particular embodiments, but that the application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
The application is described in detail below with reference to the attached drawings and alternative embodiments.
Fig. 1 is a schematic step diagram of a driving method of a display panel according to a first embodiment of the present application, and as shown in fig. 1, the driving method of the display panel includes the steps of:
a: in the scanning period of the current frame time, the pixel active switch corresponding to each row of scanning lines is conducted row by row, and the pixel voltage on the data line is transmitted to the corresponding pixel respectively;
b: after the scanning period in the previous frame time is ended, when the idle period in the previous frame time is entered, all the pixel active switches are in an off state, a preset data signal is provided for the data line, the leakage current of the pixel active switches in the off state is increased, and the preset data signal charges at least one pixel.
It should be noted that, the pixel charging stated herein means that the pixel includes a pixel electrode and a common line, a pixel capacitor is formed between the pixel electrode and the common line, the pixel electrode is connected to an output end of the pixel active switch, and after the pixel voltage is provided on the data line, the pixel capacitor is charged when the corresponding pixel active switch is in an on state; and when the pixel active switch is in an off state, stopping charging the pixel capacitor. It should be noted that, at this time, the pixel voltage is stored in the pixel capacitor, and when the pixel active switch is in the off state, the voltage corresponding to the zero gray level on the data line is generally smaller than the pixel voltage stored in the pixel capacitor, so that the leakage current at this time will flow from the pixel electrode to the data line, resulting in electric quantity loss in the pixel capacitor and a drop in the pixel voltage. Wherein a frame time includes a scan period and an idle period.
In this embodiment, since the pixel active switch still has the leakage current in the off state, the leakage current will flow from the pixel electrode to the data line when the voltage on the data line is 0, resulting in the loss of the power of the pixel electrode, and the pixel voltage cannot be maintained. Therefore, the application provides the preset data signal for the data line in the idle period, so that the leakage current of the pixel active switch in the cut-off state flows from the data line to the pixel electrode, and the preset data signal can charge at least one pixel, and firstly, the problem of pixel electric quantity loss caused by the influence of the leakage current of the pixel active switch in the idle period is avoided. And secondly, the leakage current of the pixel active switch in the idle period is increased, so that the preset data signal on the data line charges more charge to the pixel in the idle period, and further other influences, such as parasitic capacitance leakage, of the pixel in the idle period are counteracted. Under normal conditions, the leakage current of the pixel active switch in the off state is smaller, and even if the preset data signal of the data line is adopted to charge the pixel, the charging quantity is very limited at the moment. Thereby improving the problem of flicker caused by leakage current and leakage current of other parasitic capacitances in the idle period of the pixel active switch of the liquid crystal display in one frame time.
In this embodiment, increasing the leakage current of the pixel active switch in the off state may use controlling the off voltage of the pixel active switch, which specifically includes:
the step A comprises the following steps:
a1: in the scanning period, a preset cut-off voltage is input to the control end of the pixel active switch, so that each row of scanning lines corresponds to the pixel active switch to be kept in a cut-off state after being conducted;
the step B comprises the following steps:
b1: entering an idle period in the current frame time after the scanning period in the current frame time is finished;
b2: providing preset data signals to all the data lines;
b3: inputting the offset cut-off voltage to a control end of the pixel active switch to increase leakage current of the pixel active switch in a cut-off state;
b4: charging all pixels by preset data signals on the data line;
fig. 2 is a timing control diagram of the first embodiment of the present application, as shown in fig. 2, showing the voltage on the data line and the variation of the off resistance in one frame time, respectively. In this embodiment, the on state of the pixel active switch is mainly controlled by the scan signal, and when the scan signal arrives, the pixel active switch is in the on state, and the pixel active switch is in the off state and is mainly controlled by the off voltage. It should be understood that the pixel active switch has an off state in a scanning period within a frame time, that is, the pixel active switch on the current line scanning line in the scanning period is turned on once and sequentially turned on line by line, and generally, the current pixel active switch always maintains an off state when the pixel active switches on other lines are turned on. At this time, the pixel active switch in the period is always in the off state except the on state by presetting the off voltage. Moreover, it is important that, in order to ensure that the leakage current of the pixel active switch in the off state is minimum, the preset off voltage corresponds to the off voltage with the minimum leakage current of the pixel active switch, and after the preset off voltage is biased, the leakage current of the pixel active switch in the off state is increased. After entering the idle period, the off-voltage after bias is provided for the pixel active switch, so that the leakage current of the pixel active switch in the off-state is increased, and the electric quantity for charging the pixel in the idle period is increased.
Specifically, the off-voltage after biasing is 0.5-5V lower than the preset off-voltage. In this embodiment, the preset cut-off voltage is biased in a smaller direction, and according to the relationship between the pixel active switch and the gate voltage, biasing to the left or right based on the preset cut-off voltage can increase the leakage current of the pixel active switch in the cut-off state. The present embodiment thus makes the off-voltage after biasing lower than the preset off-voltage in consideration of other negative effects. The off voltage is a negative power supply voltage (VSS voltage), which refers to a low voltage or a negative voltage applied to the pixel active switch in this embodiment, to control the pixel active switch to be in an off state.
Specifically, the preset cut-off voltage is-4.5V, the cut-off voltage after bias is-5V, the pixel electrode of the pixel is charged to offset other electric leakage by means of the electric leakage characteristic of the pixel active switch in an idle period, the electric leakage of the pixel active switch is very small under normal conditions, and the charging effect in the idle period is limited, so that the cut-off degree of the pixel active switch can be weakened when the cut-off voltage is biased in the idle period, the charging current of the pixel electrode in the idle period can be increased, and the effect of offsetting other electric leakage to maintain the pixel voltage is more obvious. The off-voltage bias of the part can be selected and adjusted according to the characteristics of the display panel.
It should be noted that, in the present embodiment, the manner of increasing the leakage current of the pixel active switch in the off state is mainly achieved by the off-biasing VSS voltage, but the same may be achieved by adjusting the voltage of the gate low-level signal in the gate driving circuit, i.e. biasing the gate low-level signal in the gate driving circuit by 0.5V to 5V, which also increases the leakage current of the pixel active switch in the off state.
The preset data signal in this embodiment may be set manually, and may be selected according to actual situations, which specifically includes:
for example: the preset data signal corresponds to the gray scale of 245 to 255 or-245 to-255.
For example: in the case where the polarity of the display panel is inverted in a frame inversion manner, that is, the first frame is negative and the second frame is positive, the driving is alternately performed. In this case, the gray level corresponding to the preset data signal is-255 in the idle period of the first frame, and the gray level corresponding to the preset data signal is 255 in the idle period of the second frame.
For example: in the case that the polarity inversion is not considered in the display panel, the preset data signal of the embodiment corresponds to a gray level of 255, which is the maximum voltage of the data signal.
For example: and reading pixel voltages of all pixels of the current frame, and taking the average value, the median, the mode and the highest voltage of the pixel voltages of all pixels as preset data signals.
For example: the pixel voltage of each data line of the current frame in the scanning period is read, the average value, the median, the mode and the highest voltage of the pixel voltage corresponding to each data line are used as preset data signals, the preset data signals corresponding to each data line are different, and different preset data signals can be distributed through a data driver.
The pixel corresponding to each data line can be compensated and charged more accurately by providing different preset data signals for each data line in an idle period, so that the electric quantity which can be charged by the pixel corresponding to different data lines is balanced as much as possible, the electric quantity charged by the pixel corresponding to each data line is equal or approximately equal, and gray scales displayed by the display panel are more accurate, color standards are more accurate and brightness is more uniform.
In consideration of that even if the pixel is charged in the idle period, the actual charge amount of the pixel is still small, in the embodiment, the gray level corresponding to the preset data signal can be 245 to 255 or-245 to-255, so that the voltage on the data line can be kept in the maximum voltage state, and further, all the pixels can be ensured to be charged in the idle period, so that the charge amount loss of the pixel capacitance of the pixel caused by other reasons is reduced, and the problem of polarity inversion or insufficient charge caused by other reasons can be solved.
Specifically, considering that the resolution of the display device is also higher and higher, the refresh rate of the display device is also higher and higher, when the display device with a high refresh rate is displayed with the high refresh rate, the idle period in one frame time of the display device is compressed, for example, 120HZ is used as the high refresh rate, that is, 120 frames of display pictures are displayed in 1 second, the corresponding one frame time is 1/120s, for example, 60 frames of display pictures are displayed in 1 second, that is, the one frame time is 1/60s, so that the time of one frame in the low refresh rate display is completely different from the time of one frame in the high refresh rate display, and the duration of the idle period with a corresponding low refresh rate is completely different from the duration of the idle period with a high refresh rate. Therefore, when the display device with high refresh rate is displayed with low refresh rate and high refresh rate respectively, different schemes are adopted, and the method specifically comprises the following steps:
fig. 3 is a schematic step diagram of a driving method of a first display panel according to a first embodiment of the present application, including, before the step a:
s11: identifying a refresh rate of the display panel;
s12a: executing A, B steps in each frame when the refresh rate of the display panel is less than or equal to a preset refresh rate;
s12b: and when the refresh rate of the display panel is greater than the preset refresh rate, the step B is not executed.
In this embodiment, the preset refresh rate is 60HZ, when the refresh rate of the display panel is less than or equal to 60HZ, the display is regarded as low refresh rate display, when the refresh rate of the display panel is greater than 60HZ, the display is regarded as high refresh rate display, hereinafter, the high refresh rate display means that the refresh rate of the display panel is greater than 60HZ, and the low refresh rate display means that the refresh rate of the display panel is less than or equal to 60HZ. In this embodiment, the idle period in each frame is performed under the condition of displaying the low refresh rate, and the preset data signal is provided to the data line, and the leakage current of the pixel active switch in the off state is increased, so that the preset data signal charges the pixel, thereby avoiding the flicker problem of the high refresh rate display device during the low refresh display. Considering that the time of the idle period is extremely short when the display is performed at the high refresh rate, the step B is not executed when the refresh rate of the display panel is judged to be at the high refresh rate, namely, the step of compensating and charging the pixel capacitance of the display panel under the condition of displaying at the high refresh rate is not executed, namely, after the scanning period in the current frame time is ended, when the idle period in the current frame time is entered, all the pixel active switches are in the off state, no preset data signals are provided for the data lines, and the leakage current of the pixel active switches in the off state is not increased.
Fig. 4 is a schematic step diagram of a driving method of a second display panel according to a first embodiment of the present application, including, before the step a:
s11: identifying a refresh rate of the display panel;
s12a: executing A, B steps in each frame when the refresh rate of the display panel is less than or equal to a preset refresh rate;
s12c: when the refresh rate of the display panel is greater than the preset refresh rate, a step of A, B is performed in the next frame after every interval by a preset number of frames.
In this embodiment, the step of A, B is performed in each frame except for the low refresh rate display, and there is also an idle period in consideration of the high refresh rate display. However, since the idle period during high refresh rate display is significantly shorter than the idle period during low refresh rate display, when the high refresh rate display is performed, each frame does not need to perform A, B steps, but the pixel electrode is subjected to compensation charging once after a preset frame number is spaced, so that the influence of the leakage current of the active switch of the pixel can be reduced, the power consumption of the data driving chip can be saved, and the problem of power consumption improvement caused by performing A, B steps during high refresh rate display is avoided.
Of course, in the case of low frame rate display, the step A, B may be performed in the next frame after the preset number of frames per interval as well. The preset frame number comprises 1 frame, 2 frames, 3 frames, 5 frames and the like, and can be selected according to actual conditions by combining with specifications of a data driving chip and the like.
Fig. 5 is a schematic step diagram of a driving method of a third display panel according to the first embodiment of the present application, and further includes another implementation manner when identifying for the low refresh rate display and the high refresh rate display, that is, before the step a includes:
s11: identifying a refresh rate of the display panel;
s12d: reading the time of each frame idle period corresponding to the refresh rate, determining the preset interval frame number according to the time of the idle period, and executing A, B in the next frame after each preset interval frame number.
In this embodiment, the refresh rate of the display panel is identified, and then whether an interval is required or not is determined according to the time of each frame idle period corresponding to different refresh rates,Or the step of performing A, B at intervals of a preset number of frames. It should be understood that the durations of the idle periods of different display panels may be different, and the durations of the idle periods corresponding to different refresh rates may be different, and thus the number of interval frames may be determined according to the durations. For example, in the case of low refresh rate display, if the duration of the idle period is determined to be long, the step A, B may be performed every frame, and if the duration of the idle period is determined to be short, the step A, B may be performed at intervals of a preset number of frames. Specifically, the scan duration in one frame is calculated as x seconds, and the idle period of one frame is 1/60-x when displaying at a low refresh rate of 60HZ. At 120HZ high refresh rate display, the idle period of one frame is 1/120-x. Can be according toHow many frames are spaced. The scanning duration x within one frame of the display panel with different resolutions is different, taking x=1/150 as an example here, the ratio may be calculated to be 6, that is, the duration of the idle period in the low refresh rate display is 6 times the duration of the idle period in the high refresh rate display, and the corresponding step of A, B is performed at intervals of 6 frames in the high refresh rate display. It is generally preferable to perform the step A, B every frame, but this significantly increases the pressure of the data driving chip, so that, in order to balance this problem, it may be selected according to practical situations, for example, the preset number of frames of the interval may be set according to the ratio of the durations of the different idle periods.
In this embodiment, the step A, B is performed every frame when the high refresh rate display is switched to the low refresh rate display, and the step A, B may be performed every frame interval after a period of time, in consideration of the problem that the high refresh rate display needs to be switched between the high refresh rate display and the low refresh rate display during the display and flicker is more likely to occur when the switched low refresh rate display. The method mainly solves the problem of flicker when the display with high refresh rate is switched to the display with low refresh rate.
Of course, in another variant embodiment, the high refresh rate display may be delayed by a few frames before switching to the low refresh rate display during switching between the high refresh rate display and the low refresh rate display. Among the delayed frames, the step A, B may be performed every frame, and then the step A, B may be performed every frame while switching to low refresh rate display. In this embodiment, a plurality of frames delayed in the high refresh rate display are made to be transition stages, and the problem of flicker and low brightness caused by switching to the low refresh rate display is reduced.
Furthermore, in order to consider that the next frame needs to be normally displayed after the A, B step is performed, the B step needs to be completed in advance, and after the B step, the method includes: and before the idle period in the current frame time is ended, restoring the cut-off voltage in advance by a preset time, inputting the cut-off voltage to the control end of the pixel active switch, and stopping providing the preset data signal to the data line. The preset time can be designed according to practical conditions by combining each frame time.
Fig. 6 is a schematic view of a display device according to a second embodiment of the present application, and as shown in fig. 6, the display device 10 includes: the display panel 100 and the driving circuit 200, wherein the display panel 100 includes a plurality of data lines 110, a plurality of scan lines 120, a plurality of pixel active switches 130 and a plurality of pixels 140, the plurality of pixel active switches 130 are arranged in a one-to-one correspondence with the plurality of pixels 140, a control end of the pixel active switch 130 is connected with the scan lines 120, an input end of the pixel active switch 130 is connected with the data lines, and an output end of the pixel active switch 130 is connected with the pixels 140; the driving circuit 200 includes a controller 210, a scan driver 220 and a data driver 230, the data driver 230 supplies a pixel voltage to the data line 110, the scan driver 220 supplies a scan signal to the scan line 120, the controller 210 controls the data driver 230 to supply a pixel voltage to the data line 110 during a scan period, controls the data driver 230 to supply a preset data signal to the data line 110 during an idle period, and the controller 210 controls the scan driver 220 to supply a scan signal to the scan line 120 during a scan period, and controls the scan driver 220 to increase a leakage current of the pixel active switch 130 in an off state during the idle period.
In this embodiment, since the pixel active switch still has the leakage current in the off state, the leakage current will flow from the pixel electrode to the data line when the voltage on the data line is 0, resulting in the loss of the power of the pixel electrode, and the pixel voltage cannot be maintained. Therefore, the present application provides the preset data signal to the data line 110 during the idle period, so that the leakage current of the pixel active switch in the off state flows from the data line to the pixel electrode, and the preset data signal can charge at least one pixel, and the problem of pixel power loss caused by the influence of the leakage current of the pixel active switch 130 during the idle period is avoided. Second, the leakage current of the pixel active switch 130 is increased during the idle period, so that the preset data signal on the data line 110 charges the pixel 140 more during the idle period, thereby counteracting the influence of other influences, such as parasitic capacitance leakage, on the pixel during the idle period. Normally, the leakage current of the pixel active switch 130 in the off state is small, and even if the preset data signal of the data line is used to charge the pixel, the charging amount is very limited at this time, but the present application focuses on increasing the leakage current of the pixel active switch 130 in the off state in the idle period, so as to increase the charge amount of the pixel in this period. Thereby solving the problem that the pixel active switch 130 of the liquid crystal display has flicker caused by leakage current and other parasitic capacitance leakage in an idle period within one frame time.
Specifically, the driving circuit 200 further includes a power circuit 240, the controller 210 controls the power circuit 240 to provide the scan signal and the preset cut-off voltage to the scan driver 220 in the scan period, and the controller 210 controls the power circuit 240 to provide the biased cut-off voltage to the scan driver 220 in the idle period, wherein the biased cut-off voltage is lower than the preset cut-off voltage by 0.5-5V.
Specifically, the controller 210 is a timing controller 211, the timing controller 211 determines a refresh rate of the display panel, and when the timing controller 211 determines that the display panel is at a high refresh rate, after each preset frame time, the controller controls the scan driver 220 to increase the leakage current of the pixel active switch 130 in the off state in an idle period, and controls the data driver 230 to provide a preset data signal for the data line; when the timing controller 211 determines that the display panel is at a low refresh rate, the scan driver 220 is controlled to increase the leakage current of the pixel active switch 130 in the off state during the idle period in each frame time, and the data driver 230 is controlled to provide the data lines with a preset data signal.
The cut-off voltage in the application is mainly provided by a power circuit, the time sequence controller can identify the high refresh rate and the low refresh rate of the display, and can identify the scanning period and the idle period in one frame, and the power circuit, the scanning driver and the data driver are allocated by the time sequence controller so as to charge more charges to the pixels by the preset data signals on the data lines in the idle period, thereby counteracting the leakage of the pixels due to other influences such as parasitic capacitance in the idle period.
It should be noted that, the limitation of each step in the present solution is not to be considered as limiting the sequence of steps on the premise of not affecting the implementation of the specific solution, and the steps written in the previous step may be executed before, or executed after, or even executed simultaneously, so long as the implementation of the present solution is possible, all the steps should be considered as falling within the protection scope of the present application.
It should be noted that, the inventive concept of the present application can form a very large number of embodiments, but the application documents are limited in space and cannot be listed one by one, so that on the premise of no conflict, the above-described embodiments or technical features can be arbitrarily combined to form new embodiments, and after the embodiments or technical features are combined, the original technical effects will be enhanced.
The technical scheme of the application can be widely applied to various display panels, such as TN (Twisted Nematic) display panels, IPS (In-Plane Switching) display panels, VA (Vertical Alignment) display panels, MVA (Multi-Domain Vertical Alignment) display panels, and of course, other types of display panels, such as OLED (Organic Light-Emitting Diode) display panels, can be also applied to the scheme.
The above description of the application in connection with specific alternative embodiments is further detailed and it is not intended that the application be limited to the specific embodiments disclosed. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the application, and these should be considered to be within the scope of the application.
Claims (10)
1. A driving method of a display panel, comprising the steps of:
in the scanning period of the current frame time, the pixel active switch corresponding to each row of scanning lines is conducted row by row, and the pixel voltage on the data line is transmitted to the corresponding pixel respectively;
after the scanning period in the previous frame time is ended, when the idle period in the previous frame time is entered, all the pixel active switches are in an off state, a preset data signal is provided for the data line, the leakage current of the pixel active switches in the off state is increased, and the preset data signal charges at least one pixel.
2. The method according to claim 1, wherein the predetermined data signal has a corresponding gray level of 245 to 255 or-245 to-255.
3. The method for driving a display panel according to claim 1, wherein,
in the scanning period in the current frame time, the pixel active switch corresponding to each row of scanning lines is turned on row by row, and the step of transmitting the pixel voltage on the data line to the corresponding pixel respectively further comprises the following steps:
in a scanning period, a preset cut-off voltage is input to a control end of the pixel active switch, so that each row of scanning lines corresponds to the pixel active switch and keeps a cut-off state after being conducted;
after the scanning period in the current frame time is ended, when the scanning period in the current frame time is started to enter an idle period in the current frame time, all the pixel active switches are in an off state, a preset data signal is provided for the data line, the leakage current of the pixel active switches in the off state is increased, and the step of charging at least one pixel by the preset data signal comprises the following steps:
after the scanning period in the current frame time is ended, when entering the idle period in the current frame time, providing preset data signals for all the data lines;
inputting the offset cut-off voltage to the control end of the pixel active switch to increase the leakage current of the pixel active switch in the cut-off state;
the preset data signals on the data lines charge all pixels;
wherein the cutoff voltage is a negative supply voltage.
4. A driving method of a display panel according to claim 3, wherein the off-voltage after the biasing is lower than the preset off-voltage by 0.5-5V.
5. The method according to claim 1, wherein the pixel active switch corresponding to each row of scan lines is turned on row by row in the scan period in the current frame time, and the pixel voltage on the data line is transmitted to the corresponding pixel, respectively, before the step of:
judging the refresh rate of the display panel;
when the refresh rate of the display panel is smaller than or equal to a preset refresh rate, executing the step of conducting pixel active switches corresponding to each row of scanning lines row by row in each frame in the scanning period in the current frame time, respectively transmitting pixel voltages on the data lines to corresponding pixels, and when entering an idle period in the current frame time after the scanning period in the current frame time is finished, all the pixel active switches are in an off state, providing preset data signals for the data lines, increasing leakage currents of the pixel active switches in the off state, and charging at least one pixel by the preset data signals;
when the refresh rate of the display panel is greater than the preset refresh rate, after every preset frame number, executing the step of conducting the pixel active switches corresponding to each row of scanning lines row by row in the scanning period in the current frame time in the next frame, respectively transmitting the pixel voltage on the data lines to the corresponding pixels, and when entering the idle period in the current frame time after the scanning period in the current frame time is finished, all the pixel active switches are in an off state, providing preset data signals for the data lines, increasing the leakage current of the pixel active switches in the off state, and charging at least one pixel by the preset data signals.
6. The driving method of a display panel according to claim 5, wherein the preset refresh rate is 60HZ.
7. The driving method of a display panel according to claim 1, wherein when the idle period in the previous frame time is entered after the scanning period in the previous frame time is ended, all the pixel active switches are in an off state, a preset data signal is provided to the data line, and a leakage current of the pixel active switches in the off state is increased, and the step of charging at least one pixel with the preset data signal comprises:
and before the idle period in the current frame time is ended, restoring the cut-off voltage in advance by a preset time, inputting the cut-off voltage to the control end of the pixel active switch, and stopping providing the preset data signal to the data line.
8. A display device, the display device comprising: the display panel comprises a plurality of data lines, a plurality of scanning lines, a plurality of pixel active switches and a plurality of pixels, wherein the pixel active switches are arranged in a one-to-one correspondence manner, the control end of each pixel active switch is connected with the corresponding scanning line, the input end of each pixel active switch is connected with the corresponding data line, and the output end of each pixel active switch is connected with the corresponding pixel; the driving circuit includes a controller, a scan driver, and a data driver, the data driver supplying a pixel voltage to the data line, the scan driver supplying a scan signal to the scan line,
the controller controls the data driver to provide pixel voltages for the data lines in a scanning period, and controls the data driver to provide preset data signals for the data lines in an idle period;
the controller controls the scanning driver to provide scanning signals for the scanning lines in a scanning period, and controls the scanning driver to increase leakage current of the pixel active switch in an off state in an idle period.
9. The display device according to claim 8, wherein the driving circuit further comprises a power supply circuit, the controller controls the power supply circuit to supply the scan signal and the preset cutoff voltage to the scan driver during the scan period, and controls the power supply circuit to supply the biased cutoff voltage to the scan driver during the idle period, the biased cutoff voltage being lower than the preset cutoff voltage by 0.5 to 5V.
10. The display device according to claim 8, wherein the controller is a timing controller that determines a refresh rate of the display panel;
when the time schedule controller judges that the display panel is in a high refresh rate, after each interval of preset frame time, the scanning driver is controlled to increase the leakage current of the pixel active switch in a cut-off state in an idle period, and the data driver is controlled to provide preset data signals for the data lines; and when the time schedule controller judges that the display panel is in a low refresh rate, in each frame time, controlling the scanning driver to increase the leakage current of the pixel active switch in a cut-off state in an idle period, and controlling the data driver to provide a preset data signal for the data line.
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