CN109686335B - Time sequence control method, time sequence controller and display device - Google Patents
Time sequence control method, time sequence controller and display device Download PDFInfo
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- CN109686335B CN109686335B CN201910123716.3A CN201910123716A CN109686335B CN 109686335 B CN109686335 B CN 109686335B CN 201910123716 A CN201910123716 A CN 201910123716A CN 109686335 B CN109686335 B CN 109686335B
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
Abstract
The invention discloses a time sequence control method, a time sequence controller and a display device, wherein the time sequence control method comprises the following steps: judging whether the polarity inversion signal is inverted or not; if so, judging whether the polarities of the two frames of image data before and after the overturning are the same; if the gray scale difference values are the same, detecting whether the first gray scale difference values of the two frames of image data meet a preset gray scale range; if so, the timing controller outputs a control signal to change the control mode of the charge sharing of the source driver from following the polarity inversion signal to following the row synchronization time signal when the polarity inversion signal is inverted, and/or changes the gate time of the row synchronization time signal from a first time to a second time to adjust the charging time of the data line. The embodiment of the invention can solve the problem of poor display caused by the inversion of the polarity inversion signal of the large-size display device and effectively improve the display performance of the display device.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a timing control method, a timing controller, and a display device.
Background
Currently, in order to solve the problem of dc residue caused by movable ions in liquid crystal molecules in a liquid crystal display device, the polarity of the voltage on the liquid crystal capacitor of each pixel unit needs to be inverted, so that the display voltages provided to the pixel units have opposite polarities in the two frames before and after, and the polarity inversion signal is usually used to invert the display voltages frame by frame to drive the source driver.
Meanwhile, in order to solve the problem of insufficient charging of pixel electrodes due to progressive scanning of a high-resolution liquid crystal display device, normally, interlaced scanning is adopted by the liquid crystal display device to write gray scale voltages into the pixel electrodes, but the interlaced scanning easily causes the problem of residual image aggravation due to unbalanced frame polarity. For this reason, it is common in the prior art to invert the polarity inversion signal entirely at a predetermined period to solve the problem of the afterimage emphasis, for example, in a large-sized high-definition liquid crystal television, the inversion period of the polarity inversion signal is set to 28 seconds, and the polarity inversion signal is inverted every 28 seconds. However, the polarity inversion signal is likely to cause the same polarity of the image data of two frames before and after the inversion, and when the polarities of the image data of two consecutive frames are the same and the gray-scale values are similar, the display screen is likely to generate a flicker phenomenon, thereby causing a display defect.
Disclosure of Invention
In order to solve at least one of the above problems, a first aspect of the present invention provides a timing control method, including:
judging whether the polarity inversion signal is to be inverted or not when the time schedule controller detects the nth frame image data;
if the image data is to be turned over, the time schedule controller detects whether the polarity of the received (n +1) th frame of image data is the same as that of the nth frame of image data;
if the gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range, the time sequence controller detects whether the first gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range;
if so, when the polarity inversion signal is inverted
The timing controller outputs a control signal to change the control manner of charge sharing of the source driver from following the polarity inversion signal to following the line synchronization timing signal, and/or
Changing a gate time of the row synchronization time signal from a first time to a second time to adjust a charging time of the data line;
wherein n is a natural number.
Further, the determining whether the polarity inversion signal is to be inverted when the timing controller detects the nth frame image data further includes:
and judging according to the preset period overturning time of the polarity inversion signal.
Further, the controlling manner in which the timing controller outputs the control signal to change the charge sharing of the source driver from following the polarity inversion signal to following the row synchronization time signal further includes:
and setting the control signal to be in an effective state in a time period corresponding to the (n +1) th frame of image data.
Further, after the setting the control signal to be in an active state in a time period corresponding to the (n +1) th frame of image data, the method further includes:
and the time schedule controller detects a second gray scale difference value of two adjacent frames of image data, and if the second gray scale difference value meets the gray scale range, the control signal is set to be in an effective state in a time period corresponding to the two adjacent frames of image data.
Further, the changing the strobe time of the row synchronization time signal from the first time to the second time to adjust the charging time of the data line further includes:
and determining the second time according to the gray-scale value corresponding to each line of data in the (n +1) th frame of image data.
Further, the control signal is transmitted to the source driver through a general input/output pin of the timing controller; or
The control signal is a virtual signal and is transmitted to the source driver through a protocol transmission signal line of the time schedule controller.
Further, after setting the control signal to be in an active state in a time period corresponding to the (n +1) th frame of image data, the method further includes:
and the time schedule controller detects a second gray scale difference value of two adjacent frames of image data, and if the second gray scale difference value does not meet the gray scale range, the control signal is set to be in an invalid state, and the gating time of the line synchronization time signal is set to be the first time.
The second aspect of the present invention provides a timing controller, comprising a detection circuit and a control circuit,
the detection circuit is configured to
Judging whether the polarity inversion signal is to be inverted or not when the time schedule controller detects the nth frame image data;
if the image data is to be turned over, the time schedule controller detects whether the polarity of the received (n +1) th frame of image data is the same as that of the nth frame of image data;
if the gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range, the time sequence controller detects whether the first gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range;
if so, when the polarity inversion signal is inverted
The control circuit is configured to
The output control signal changes the control mode of charge sharing of the source driver from following the polarity inversion signal to following the row synchronization time signal, and/or
Changing a gate time of the row synchronization time signal from a first time to a second time to adjust a charging time of the data line;
wherein n is a natural number.
Further, the timing controller is configured to:
transmitting the control signal to the source driver through a general input/output pin; or
And transmitting the signal line to the source driver through a protocol of the timing controller.
A third aspect of the invention provides a display device comprising the timing controller as described in the second aspect.
The invention has the following beneficial effects:
the invention provides a time sequence control method aiming at the existing problems, which is characterized in that the polarity and gray scale difference value of two frames of image data before and after the polarity inversion signal is inverted are detected, the control mode of charge sharing of a source electrode driver is changed from following the polarity inversion signal to following a line synchronization time signal through a time sequence controller output control signal, and/or the gating time of the line synchronization time signal is changed from a first time to a second time so as to adjust the charging time of a data line, thereby avoiding poor display caused by the polarity inversion signal, effectively making up the problems in the prior art, improving the display effect of a display device and further improving the user experience of a user.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 illustrates a timing diagram of the timing controller in the related art;
FIG. 2 is a flow chart illustrating a timing control method according to an embodiment of the present invention;
FIG. 3 is a timing diagram of the timing controller according to one embodiment of the present invention;
FIG. 4 illustrates a waveform diagram for controlling charge sharing following a polarity inversion signal according to an embodiment of the present invention;
FIG. 5 illustrates a waveform diagram for controlling charge sharing in response to a row sync time signal according to one embodiment of the present invention;
fig. 6 is a schematic structural diagram of a timing controller according to another embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
As shown in fig. 1, in the related art, the scan driving IC of the timing controller TCON of the display device outputs a start control signal STV for starting DATA transmission, a polarity inversion signal POL and image DATA act following the STV signal, and the voltage polarity of the image DATA is inverted by frame following the polarity inversion signal POL. The polarity inversion signal inverts the polarity of the voltage on the liquid crystal capacitor of the pixel unit in each frame of image, and the polarity inversion signal is also inverted according to a preset period inversion time. The inversion period of the polarity inversion signal is typically 28 seconds, that is, the polarity inversion signal is entirely inverted every 28 seconds, and the polarity of the polarity inversion signal is changed during inversion. Therefore, as shown in fig. 1, the polarities of the image data of the two frames (the nth frame and the n +1 th frame) before and after the POL inversion are the same and both are "+" polarity, and it should be understood by those skilled in the art that when the polarity inversion signal is entirely inverted, the polarities of the data of the two consecutive frames may be positive or negative at the same time, and are not described herein again. Therefore, the voltage polarities of two consecutive frames corresponding to the image DATA are the same, in this case, when the gray scale difference values of the image DATA of the two consecutive frames are the same or similar, the gray scale values are superimposed due to the same polarity of the image DATA, and the gray scale values are superimposed to show that the electric charges corresponding to the gray scale values are superimposed, so that the display device generates a flicker phenomenon, thereby causing a display failure of the display device.
To solve the above problem, as shown in fig. 2, an embodiment of the present invention provides a timing control method, including: judging whether the polarity inversion signal is to be inverted or not when the time schedule controller detects the nth frame image data; if the image data is to be turned over, the time schedule controller detects whether the polarity of the received (n +1) th frame of image data is the same as that of the nth frame of image data; if the gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range, the time sequence controller detects whether the first gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range; if yes, when the polarity inversion signal is inverted, the timing controller outputs a control signal to change the control mode of the charge sharing of the source driver from following the polarity inversion signal to following the row synchronization time signal, and/or change the gating time of the row synchronization time signal from a first time to a second time to adjust the charging time of the data line; wherein n is a natural number.
In one specific example, as shown in fig. 2, to overcome the flicker phenomenon caused when the polarity inversion signal is periodically inverted, it is first determined when the flicker phenomenon occurs:
firstly, the judgment is carried out according to the preset period turning time of the polarity inversion signal. In this embodiment, the preset period inversion time is 28 seconds, and the polarity inversion signal POL is inverted every 28 seconds. And detecting whether the polarity inversion signal is to be inverted or not according to the period inversion time by using the characteristic that the time schedule controller TCON can receive the next frame of image data when detecting the current frame of image data, continuously detecting if the polarity inversion signal is not to be inverted according to the frame, and further detecting the polarity of the polarity inversion signal of two frames before and after the inversion if the polarity inversion signal is not to be inverted. For example, when the timing controller detects the nth frame of image data, it is determined that the polarity inversion signal is about to be inverted, where n is a natural number.
Secondly, judging whether the polarities of the image data of the nth frame and the image data of the (n +1) th frame are the same, if not, returning to continuously detect whether the polarity inversion signal is to be inverted, otherwise, as shown in fig. 3, if the polarity inversion signals of the nth frame and the (n +1) th frame are both "+", then the image data of the nth frame and the image data of the (n +1) th frame are both "+", and the polarities of two continuous frames of image data are the same.
Thirdly, whether the gray-scale difference value of the nth frame image data and the (n +1) th frame image data meets the gray-scale range is judged. When the gray scale difference between the nth frame image data and the (n +1) th frame image data is large, for example, the gray scale value of the nth frame image data is displayed as white, and the gray scale value of the (n +1) th frame image data is displayed as black, so that the two frames of image data are displayed, a viewer does not feel a flicker phenomenon, and then the process returns to continuously detect whether the polarity inversion signal is to be inverted or not; otherwise, when the gray scale values of the image data of the nth frame and the image data of the (n +1) th frame are the same or similar, for example, when the gray scale difference value of the image data of the nth frame and the image data of the (n +1) th frame is in the gray scale range of [0,20], due to the same polarity of the image data, the display device displays the image data, and the flicker phenomenon occurs due to the superposition of the gray scale values of the image data of the two frames. It should be noted that, as will be understood by those skilled in the art, the gray scale range is set according to data measured in the practical application process to avoid the occurrence of flicker, and is not described herein again.
After the flicker phenomenon of the display device is determined, when the polarity inversion signal is turned over, the display defect is avoided or improved by adopting the following implementation mode:
in the first embodiment, the timing controller TCON outputs the control signal to change the control manner of the Charge Sharing (Charge Sharing) of the Source Driver (Source Driver) from following the polarity inversion signal to following the row synchronization time signal, that is, by switching the control manner of the Charge Sharing of the Source Driver. The display device sends a driving signal to the source driver by the time schedule controller under the normal working condition, as shown in fig. 4, the control mode of the charge sharing is controlled by a polarity inversion signal POL, namely, the polarities of the current and the latter two frames of image data are different, the voltage polarities are switched according to the polarity inversion signal POL by frames, and then the display voltages corresponding to the pixels of two adjacent columns are neutralized in the source driver; however, in this control mode, when the polarities of the two frames of image data are the same, for example, the polarities of the two consecutive frames of image data output from the odd-numbered line of data in the figure are both positive, or the polarities of the two consecutive frames of image data output from the even-numbered line of data in the figure are both negative, the voltage polarity is not inverted, so that the display device appears to flicker in this case.
When the display device is judged to flicker, the timing controller outputs a control signal (GPIO in figure 3) to the source driver when the polarity inversion signal is periodically inverted, and the source driver changes the control mode of charge sharing from following the polarity inversion signal POL to following the row synchronization time signal TP according to the control signal.
The line synchronization time signal TP is a synchronization signal for the timing controller to push image data to the source driver according to the line scanning signal, and the charge sharing follows the line synchronization time signal, that is, the voltage polarity is switched at each line scanning according to the line synchronization time signal, thereby avoiding the flicker phenomenon by increasing the frequency of the charge sharing. As shown in fig. 5, the charge sharing is controlled by a row synchronization timing signal, that is, the polarities of the voltages are switched in rows, and then the display voltages corresponding to the pixels in two adjacent columns are neutralized by the source driver. In this control mode, when the polarities of the two frames of image data before and after one line of data are the same, for example, the polarities of the two frames of image data after odd line of data are positive in the figure, or the polarities of the two frames of image data after even line of data are negative in the figure, the voltage polarity is inverted according to the line synchronization time signal, the display device displays normally, and no flicker phenomenon occurs.
The control signal is a signal output by the timing controller, and may be transmitted to the source driver by using a general input/output pin of the timing controller, or may be transmitted by using an internal signal (i.e., a dummy signal) of the timing controller through an existing protocol transmission signal line of the timing controller, for example, a signal format in which the control signal is added to the protocol transmission signal, and the control signal is transmitted to the source driver through the protocol transmission signal line.
Specifically, the changing the control manner of the charge sharing of the source driver from following the polarity inversion signal to following the row synchronization time signal at the time when the timing controller outputs the control signal further includes: and setting the control signal to be in an effective state in a time period corresponding to the (n +1) th frame of image data. In order to avoid the flicker phenomenon caused by the same polarity and small gray scale difference of the two continuous frames of image data when the polarity inversion signal of the display device is reversed, the time schedule controller outputs the control signal to inform the source driver of switching the control mode of charge sharing. As shown in fig. 3, when the timing controller uses the general purpose input/output pin to transmit the control signal, the GPIO signal line is set to a high level from a low level during normal operation, and the inversion time of the GPIO signal line is preset to a time period corresponding to the (n +1) th frame of image data, and during the transmission of the frame of image data, the GPIO maintains an active state and is transmitted to the source driver.
In the second embodiment, the gate time of the line synchronization time signal is changed from the first time to the second time to adjust the charging time of the data line, thereby improving the display defect caused by the flicker phenomenon. I.e. by adjusting the strobe time of the line synchronization time signal. Under the normal working condition of the display device, the line synchronization time signal is set as a first time, the first time is a fixed value, namely the gating time of the data lines during the transmission of each row of data is the same, and the charging time of the data lines is the same. When the flicker phenomenon of the display device is judged to occur, the charging time of the data lines can be adjusted by adjusting the gating time of the line synchronization time signal to be the second time so as to avoid the flicker phenomenon of the display device, and further, the second time is the gating time determined according to the gray scale value corresponding to each line of data in the (n +1) th frame of image data.
Specifically, when the gray scale values of two consecutive frames of image data are the same or close to each other, a flicker phenomenon is likely to occur, the gray scale value of the current frame of image data is detected, the strobe time of the line synchronization time signal is increased according to the gray scale value, the line synchronization time signal is active low, and the strobe time starts from the falling edge of the line synchronization time signal to the next rising edge, as shown in fig. 3, it appears that the high level width of the line synchronization time signal TP is narrowed. For example, when the image data of the current frame is in a high gray scale (for example, the gray scale value is 255), the display device displays high brightness, and by utilizing the rule that human eyes are insensitive to an image with high brightness, the gating time of a line synchronization time signal can be increased by a small margin, namely the charging time of a data line is reduced to reduce the display brightness so as to avoid a flicker phenomenon; if the human eye is sensitive to the image with the brightness when the current frame image data is at the middle or low gray level (for example, when the gray level is 127), the flicker phenomenon can be improved by greatly increasing the gating time of the line synchronization time signal to greatly reduce the display brightness.
In the third embodiment, the methods of the first and second embodiments can be combined to avoid the flicker phenomenon of the display device. Outputting a control signal by the timing controller to change the control manner of the charge sharing of the source driver from following the polarity inversion signal to following the row synchronization time signal while changing the gate time of the row synchronization time signal from the first time to the second time to adjust the charging time of the data line at the time of the polarity inversion signal inversion. The control signal is transmitted to the source driver when the polarity inversion signal is inverted, the control mode of charge sharing is switched from the polarity inversion signal inverted by each frame to the line synchronization time signal inverted by each line, the gray level value of the current frame image data is detected, the gating time of the line synchronization time signal is further adjusted according to the gray level value, and the display brightness is reduced by reducing the charging time of the data line so as to avoid the flicker phenomenon.
In a preferred embodiment, in order to avoid a flicker phenomenon caused by the same or similar gray scale values of consecutive frames of image data after the polarity inversion signal is inverted, after the setting control signal is in an active state in a time period corresponding to the (n +1) th frame of image data, the timing control method further includes: and the time schedule controller detects a second gray scale difference value of two adjacent frames of image data, and if the second gray scale difference value meets the gray scale range, the control signal is set to be in an effective state in a time period corresponding to the two adjacent frames of image data. For example, when the image data is in the (n +1) th frame, the timing controller detects a second gray scale difference between the image data of the current frame (n +1) th frame and the image data of the next frame (n +2) th frame, and if the gray scale value of the image data of the (n +1) th frame is the same as or close to the gray scale value of the image data of the (n +2) th frame, to avoid the flicker phenomenon, the control signal is set to be in the active state in the (n +1) th frame and the (n +2) th frame, which is shown in this embodiment as extending the active state of the control signal by the time corresponding to the image data of one frame. As shown in fig. 3, the time for controlling the high level of the GPIO signal line of the signal is increased according to the gray-scale value of the (n +2) th frame of image data, and the charge sharing is controlled by the line synchronization time signal that is switched once per line in this period by increasing the effective time, that is, by increasing the frequency of the charge sharing to prevent the display device from flickering. In other words, the timing controller detects the frame image data in real time to control the effective time of the control signal, thereby effectively avoiding the flicker phenomenon caused by the same polarity, the same gray scale value or the similar of the continuous frames of image data after the polarity inversion signal is reversed. It should be noted that, as will be understood by those skilled in the art, the two adjacent frames of image data are not limited to the (n +1) th frame and the (n +2) th frame of image data, and when the polarities of two consecutive frames of image data are the same due to the inversion of the polarity inversion signal, in order to avoid that the polarities of the subsequent image data are the same as that in the inversion and the gray scale values of the subsequent image data are the same or similar to that in the inversion, the effective state of the control signal is maintained in the time period corresponding to the frame of image data until the gray scale difference between the two adjacent frames of image data is greater than the gray scale range or the polarities of the two adjacent frames of image data are different, so as to avoid the display device from generating the flicker phenomenon, which is.
After the polarity inversion signal is inverted, after the control signal is set to be in an active state in a time period corresponding to the (n +1) th frame of image data, the method further includes: and the time schedule controller detects a second gray scale difference value of two adjacent frames of image data, and if the second gray scale difference value does not meet the gray scale range, the control signal is set to be in an invalid state, and the gating time of the line synchronization time signal is set to be the first time. Namely, the gray scale difference value of two adjacent frames of image data is continuously detected until the polarities of the two adjacent frames of image data are different or the gray scale difference value does not meet the gray machine range. For example, when the image data of the (n +1) th frame is in the first gray scale difference, the timing controller detects a second gray scale difference between the image data of the current frame (n +1) th frame) and the image data of the next frame (n +2) th frame, and if the gray scale value of the image data of the (n +1) th frame is different from the gray scale value of the image data of the (n +2) th frame, the flicker phenomenon does not occur; setting the control signal to be in an invalid state, as shown in fig. 3, the GPIO signal line is at a low level, that is, the source driver is notified to change the control mode of charge sharing from following the row synchronization time signal to following the polarity inversion signal; and meanwhile, the gating time of the line synchronization time signal is modified to be the first time of a fixed value, namely the charging time of the data line is recovered to be the fixed time, and the display device is recovered to be in a normal working state.
Corresponding to the timing control method provided in the foregoing embodiments, an embodiment of the present application further provides a timing controller for implementing the timing control method, and since the timing controller provided in the embodiment of the present application corresponds to the timing control methods provided in the foregoing embodiments, the foregoing embodiments are also applicable to the timing controller provided in the embodiment, and detailed description is omitted in this embodiment.
As shown in fig. 6, an embodiment of the present application further provides a timing controller, including a detection circuit configured to determine whether a polarity inversion signal is about to be inverted when the timing controller detects an nth frame of image data; if the image data is to be turned over, the time schedule controller detects whether the polarity of the received (n +1) th frame of image data is the same as that of the nth frame of image data; if the gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range, the time sequence controller detects whether the first gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range; if so, when the polarity inversion signal is inverted, the control circuit is configured to output a control signal to change the control mode of the charge sharing of the source driver from following the polarity inversion signal to following the row synchronization time signal and/or change the gating time of the row synchronization time signal from a first time to a second time to adjust the charging time of the data line; wherein n is a natural number.
In a preferred embodiment, the timing controller is configured to: transmitting the control signal to the source driver through a general input/output pin; or transmitted to the source driver through a protocol transmission signal line of a timing controller.
Another embodiment of the present application further provides a display device including the above timing controller. The display device can be products or parts with display functions such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer and the like, and particularly can be a large-size liquid crystal display television.
The invention aims at the existing problems at present to establish a time sequence control method, by detecting the polarity and gray scale difference value of two frames of image data before and after the polarity inversion signal is inverted, the control mode of charge sharing of a source electrode driver is changed from following the polarity inversion signal to following a line synchronization time signal by outputting a control signal through a time sequence controller, and/or the gating time of the line synchronization time signal is changed from a first time to a second time so as to adjust the charging time of a data line, thereby avoiding poor display caused by the polarity inversion signal, effectively making up the problems in the prior art, improving the display effect of a display device and further improving the user experience of a user.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (9)
1. A timing control method, comprising:
judging whether the polarity inversion signal is to be inverted or not when the time schedule controller detects the nth frame image data;
if the image data is to be turned over, the time schedule controller detects whether the polarity of the received (n +1) th frame of image data is the same as that of the nth frame of image data;
if the gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range, the time sequence controller detects whether the first gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range;
if so, when the polarity inversion signal is inverted
The timing controller outputs a control signal to change the control manner of charge sharing of the source driver from following the polarity inversion signal to following the line synchronization timing signal, and/or
Changing the gating time of the line synchronization time signal from a first time to a second time to adjust the charging time of the data lines, wherein the second time is determined according to the gray-scale value corresponding to each line of data in the (n +1) th frame of image data;
wherein n is a natural number.
2. The timing control method of claim 1, wherein determining whether the polarity inversion signal is about to be inverted when the timing controller detects the nth frame of image data further comprises:
and judging according to the preset period overturning time of the polarity inversion signal.
3. The timing control method according to claim 1, wherein the timing controller outputting the control signal to change the control manner of the charge sharing of the source driver from following the polarity inversion signal to following the row synchronization time signal further comprises:
and setting the control signal to be in an effective state in a time period corresponding to the (n +1) th frame of image data.
4. The timing control method according to claim 3, wherein after the setting of the control signal to the active state for a period of time corresponding to the (n +1) th frame image data, the method further comprises:
and the time schedule controller detects a second gray scale difference value of two adjacent frames of image data, and if the second gray scale difference value meets the gray scale range, the control signal is set to be in an effective state in a time period corresponding to the two adjacent frames of image data.
5. The timing control method according to claim 1,
the control signal is transmitted to the source driver through a general input/output pin of a time schedule controller; or
The control signal is a virtual signal and is transmitted to the source driver through a protocol transmission signal line of the time schedule controller.
6. The timing control method according to claim 3, wherein after setting the control signal to an active state for a period corresponding to the (n +1) th frame image data, the method further comprises:
and the time schedule controller detects a second gray scale difference value of two adjacent frames of image data, and if the second gray scale difference value does not meet the gray scale range, the control signal is set to be in an invalid state, and the gating time of the line synchronization time signal is set to be the first time.
7. A time schedule controller is characterized by comprising a detection circuit and a control circuit,
the detection circuit is configured to determine whether the polarity inversion signal is to be inverted when the timing controller detects the nth frame of image data;
if the image data is to be turned over, the time schedule controller detects whether the polarity of the received (n +1) th frame of image data is the same as that of the nth frame of image data;
if the gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range, the time sequence controller detects whether the first gray scale difference value of the nth frame image data and the (n +1) th frame image data meets the preset gray scale range;
if so, when the polarity inversion signal is inverted
The control circuit is configured to
The output control signal changes the control mode of charge sharing of the source driver from following the polarity inversion signal to following the row synchronization time signal, and/or
Changing the gating time of the line synchronization time signal from a first time to a second time to adjust the charging time of the data lines, wherein the second time is determined according to the gray-scale value corresponding to each line of data in the (n +1) th frame of image data;
wherein n is a natural number.
8. The timing controller of claim 7, wherein the timing controller is configured to:
transmitting the control signal to the source driver through a general input/output pin; or
And transmitting the signal line to the source driver through a protocol of the timing controller.
9. A display device comprising the timing controller according to claim 7 or 8.
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| US10777155B1 (en) * | 2019-07-16 | 2020-09-15 | Himax Technologies Limited | Method for controlling polarity of each subpixels of display panel by using pattern detection manner |
| CN110599942A (en) * | 2019-09-30 | 2019-12-20 | 京东方科技集团股份有限公司 | Display panel driving method and device and display device |
| CN112967693A (en) * | 2021-02-26 | 2021-06-15 | 北京集创北方科技股份有限公司 | Driving method and device, chip and electronic equipment |
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| CN113971943B (en) * | 2021-11-17 | 2022-11-01 | 京东方科技集团股份有限公司 | Display driving method and device and display device |
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