CN118173045A - Driving method and driving circuit of display panel, display panel and display device - Google Patents
Driving method and driving circuit of display panel, display panel and display device Download PDFInfo
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
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Abstract
The application relates to a driving method and a driving circuit of a display panel, the display panel and a display device. The method comprises the following steps: determining a first light emitting device to be subjected to segmented pulling when a plurality of columns of light emitting devices of a target row need to be driven to emit light; determining a target pull-down voltage required to drive the first light emitting device to emit light; and carrying out sectional pulling on the column line voltage of the first light emitting device through a plurality of voltage output units with different output voltages and the output voltages being greater than or equal to the target pull-down voltage so as to pull down the column line voltage of the first light emitting device to the target pull-down voltage in a sectional manner. The application divides the pull-down voltage of the first light emitting device needing to execute the sectional pulling strategy into a plurality of sections to realize, thereby changing the primary complete large-scale change of the line voltage into a plurality of sections of small-scale change, avoiding the influence of the short-time large-scale change on other light emitting devices and solving the technical problem that the high bright picture has interference influence on the low bright picture.
Description
Technical Field
The present application relates to the field of LED display technologies, and in particular, to a driving method and driving circuit for a display panel, and a display device.
Background
With the development of LED display technology, LED display screens put forward higher demands on row driving, and today, more powerful multifunctional row driving can be realized, and accordingly, the defect of poor anti-interference capability is more and more prominent, for example, when high-brightness pictures and low-brightness pictures in a row overlap, the high-brightness pictures cause interference effects on the low-brightness pictures.
Aiming at the problem that the high-brightness picture has interference influence on the low-brightness picture, no effective solution is proposed at present.
Disclosure of Invention
The application provides a driving method of a display panel, a driving circuit, the display panel and a display device, and aims to solve the technical problem that a highlight picture affects interference on a low-light picture.
According to an aspect of an embodiment of the present application, there is provided a driving method of a display panel including: determining a first light emitting device to be subjected to segmented pulling when a plurality of columns of light emitting devices of a target row need to be driven to emit light; determining a target pull-down voltage required to drive the first light emitting device to emit light; and carrying out sectional pulling on the column line voltage of the first light emitting device through a plurality of voltage output units with different output voltages and the output voltages being greater than or equal to the target pull-down voltage so as to pull down the column line voltage of the first light emitting device to the target pull-down voltage in a sectional manner.
Optionally, the step of sectionally pulling the column line voltage of the first light emitting device through a plurality of voltage output units having different output voltages and the output voltages being equal to or greater than the target pull-down voltage, includes: detecting a line scanning signal of the target line; when the start of the row scanning signals is detected, transistors corresponding to the voltage output units are sequentially conducted according to the sequence from large to small of the output voltages of the voltage output units, so that the column line voltage is sequentially pulled down to the output voltage of each voltage output unit, and the column line voltage is pulled down to the target pull-down voltage until the last voltage output unit is conducted.
Optionally, when the transistors corresponding to any one of the voltage output units are turned on, the transistors corresponding to the other voltage output units are turned off, the on time length of any one of the transistors is greater than or equal to a first time length threshold, the sum of the on time lengths of all the transistors is greater than a second time length threshold, the first time length threshold is the minimum time length required for completing the pull-down process of each stage, the second time length threshold is the minimum time length for triggering the light-emitting state change of the second light-emitting device by the line voltage change, and the second light-emitting device is the light-emitting device with the gray scale value smaller than the gray scale value of the first light-emitting device in the target row.
Optionally, the determining that the first light emitting device needs to be pulled in a segmented manner includes: acquiring gray scale values of all light emitting devices of the target row, and determining a maximum gray scale value and a minimum gray scale value in all gray scale values; calculating a difference value between the maximum gray level value and the minimum gray level value; if the difference value is larger than a preset threshold value, determining a minimum gray level value of a relatively high gray level according to a preset proportion, the maximum gray level value and the minimum gray level value; and determining a light emitting device with a gray scale value greater than or equal to the minimum gray scale value of the relatively high gray scale in the target row as the first light emitting device.
According to another aspect of embodiments of the present application, there is provided a driving circuit of a display panel, including a row driving unit and a column driving unit, the column driving unit including a timing controller, a plurality of voltage output units, and transistors corresponding to each of the voltage output units, wherein: the row driving unit is used for sending a row scanning signal to the multi-row light emitting device; the voltage output units are used for providing a plurality of output voltages with different magnitudes; the time schedule controller is connected with each transistor and is used for carrying out segmented pulling on the column line voltage of the first light emitting device on the target row when the starting of the row scanning signal of the target row is detected, and the time schedule controller comprises the following components: and sequentially switching on transistors corresponding to the voltage output units according to the order from large to small of the output voltages of the voltage output units so as to sequentially pull down the column line voltage controlling the first light emitting device to the output voltage of each voltage output unit until the last voltage output unit is switched on, and pulling down the column line voltage to a target pull-down voltage, wherein the target pull-down voltage is a pull-down voltage required for driving the first light emitting device to emit light.
Optionally, the timing controller is further configured to control a turn-on duration of each transistor, so that when any one of the transistors corresponding to the voltage output units is turned on, the transistors corresponding to the rest of the voltage output units are turned off, the turn-on duration of any one of the transistors is greater than or equal to a first duration threshold, a sum of the turn-on durations of all the transistors is greater than a second duration threshold, the first duration threshold is a minimum duration required for completing a pull-down process of each stage, the second duration threshold is a minimum duration for triggering a light-emitting state change of a second light-emitting device by the line voltage change, and the second light-emitting device is a light-emitting device with a gray scale value in the target row smaller than a gray scale value of the first light-emitting device.
Optionally, the timing controller is further configured to: acquiring gray scale values of all light emitting devices of the target row, and determining a maximum gray scale value and a minimum gray scale value in all gray scale values; calculating a difference value between the maximum gray level value and the minimum gray level value; and if the difference value is larger than a preset threshold value, determining a minimum gray level value of a relatively high gray level according to a preset proportion, the maximum gray level value and the minimum gray level value.
Optionally, the column driving unit further includes a counting unit, where the counting unit is connected to the timing controller, the counting unit is configured to mark a light emitting device in the target row with a gray level greater than or equal to the minimum gray level of the relatively high gray level as a first light emitting device, and the timing controller is further configured to determine the first light emitting device as a light emitting device that needs to be pulled in a segmented manner.
According to still another aspect of the embodiments of the present application, there is provided a display panel including an array substrate, a color film substrate, and a liquid crystal layer disposed between the array substrate and the color film substrate, the array substrate including the driving circuit as described above.
According to still another aspect of the embodiments of the present application, a display device is provided, including a backlight module and the display panel described above, where the backlight module is disposed on a backlight side of the array substrate and is configured to provide a light source for the display panel.
Compared with the related art, the technical scheme provided by the embodiment of the application has the following advantages:
The application provides a driving method of a display panel, comprising the following steps: determining a first light emitting device to be subjected to segmented pulling when a plurality of columns of light emitting devices of a target row need to be driven to emit light; determining a target pull-down voltage required to drive the first light emitting device to emit light; and carrying out sectional pulling on the column line voltage of the first light emitting device through a plurality of voltage output units with different output voltages and the output voltages being greater than or equal to the target pull-down voltage so as to pull down the column line voltage of the first light emitting device to the target pull-down voltage in a sectional manner. The application divides the pull-down voltage of the first light emitting device which needs to be pulled in sections into a plurality of sections to realize, thereby changing the original once completed large-scale change of the line voltage into a plurality of sections of small-scale change, avoiding the influence of the short-time large-scale change on other light emitting devices and solving the technical problem that the high bright picture has interference influence on the low bright picture.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it will be apparent to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a schematic diagram of a highlight interfering with a low-light picture;
FIG. 2 is a schematic flow chart of a driving method of a display panel according to an embodiment of the application;
FIG. 3 is a schematic diagram of a column line voltage pulling waveform according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a driving circuit of a display panel according to a second embodiment of the application;
FIG. 5 is a schematic structural diagram of a display panel according to a third embodiment of the present application;
Fig. 6 is a schematic structural diagram of another display panel according to the third embodiment of the present application;
fig. 7 is a schematic structural diagram of a display device according to a fourth embodiment of the application.
Reference numerals illustrate: 1. a row driving unit; 2. a column driving unit; 201. a timing controller; 202. a voltage output unit; 203. a transistor; LEDs 1 to 6 and a light emitting device; scan 1-3, line Scan signal; t1-3, three voltage output units; v1-3, and the output voltages of the voltage output units T1-3; 100. an array substrate; 200. a backlight module; 300. a color film substrate; 400. and a liquid crystal layer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the following description, suffixes such as "module", "component", or "unit" for representing elements are used only for facilitating the description of the present application, and are not of specific significance per se. Thus, "module" and "component" may be used in combination.
For LED lamp driving, as shown in fig. 1, if LED1 is turned off and LED2 is highlighted, this is the most likely to cause high contrast interference problem, and the more the proportion of highlighting and low-lighting/even non-lighting in a row, the more serious the interference phenomenon is, the root cause is that in fig. 1, in the case that LED1 is not lit, the OUT2 pulling voltage of driving LED2 is changed excessively, so as to be coupled to OUT1 via parasitic capacitance Cmutual. The capacitive coupling is caused by the capacitive characteristic, that is, the voltage at two ends of the capacitor cannot be changed due to transient, in fig. 1, the voltage at the b end is changed by how much, and in theory, the voltage at the a end is also changed by how much, so that if the voltage at one side of the capacitor is changed for a shorter time, the change amplitude is larger, and the influence of interference on the other side of the capacitor is larger.
In order to solve the problem that the high brightness picture affects the low brightness picture, according to an aspect of the embodiment of the present application, an embodiment of a driving method of a display panel is provided, and a core idea of the embodiment of the present application is that the voltage variation amount is not caused to illuminate the LED1 in a time of controlling variation in actual display, and the voltage variation that can cause the illumination of the LED1 can be divided into multiple segments, so that the problem can be solved.
The driving method of the display panel may be performed by a timing controller, as shown in fig. 2, and may include the steps of:
step S202, when a plurality of columns of light emitting devices of a target row need to be driven to emit light, determining a first light emitting device needing to be subjected to segmented pulling;
step S204, determining a target pull-down voltage required for driving the first light emitting device to emit light;
Step S206, the column line voltage of the first light emitting device is pulled in segments by a plurality of voltage output units with different output voltages and the output voltages are greater than or equal to the target pull-down voltage, so as to pull down the column line voltage of the first light emitting device to the target pull-down voltage in segments.
Through the steps S202 to S206, the application divides the pull-down voltage of the first light emitting device which needs to be pulled in a segmented way into a plurality of segments, thereby changing the primary complete large-scale change of the line voltage into a plurality of segments of small-scale change, avoiding the influence of the short-time large-scale change on other light emitting devices and solving the technical problem that the high bright picture has interference influence on the low bright picture.
In step S202, the timing when the multi-column light emitting device of the target row needs to be driven to emit light refers to after the scan signal of the previous row is turned off when the row-to-row is switched, for example, before the scan signal of the current row is turned on. The determining of the first light emitting device to be subjected to the segmented pulling is performed by the time sequence controller, judging whether the first light emitting device to be subjected to the segmented pulling is required, and judging whether the light emitting device with the overlarge gray level difference exists in the target row, specifically, the determining of the first light emitting device to be subjected to the segmented pulling comprises the following steps:
step 1, acquiring gray scale values of all light emitting devices of the target row, and determining a maximum gray scale value and a minimum gray scale value in all the gray scale values;
Step 2, calculating the difference value between the maximum gray level value and the minimum gray level value;
Step 3, if the difference value is larger than a preset threshold value, determining a minimum gray level value of a relatively high gray level according to a preset proportion, the maximum gray level value and the minimum gray level value;
and step 4, determining the light-emitting device with the gray scale value larger than or equal to the minimum gray scale value of the relatively high gray scale in the target row as the first light-emitting device.
If there are light emitting devices with too large gray level differences in the same row, the interference of the light emitting device with high gray level to the light emitting device with low gray level is easily caused, so that the magnitude of the preset threshold can be determined according to the actual situation or actual requirement, and the magnitude of the preset threshold is in inverse relation with the anti-interference sensitivity, that is, the smaller the preset threshold is, the higher the anti-interference sensitivity is.
In the embodiment of the present application, the gray scale levels are relative, for example, when a light emitting device with a gray scale level of 30 is compared with a light emitting device with a gray scale level of 120, the light emitting device with a gray scale level of 119 is a relatively high gray scale level of 30, and when a light emitting device with a gray scale level of 119 is compared with a light emitting device with a gray scale level of 120, the light emitting device with a gray scale level of 119 is not a relatively high gray scale level, so that the preset ratio, for example, 60%, corresponds to the sum of 60% of the gray scale differences and the minimum gray scale level, and is used as the minimum gray scale level of the relatively high gray scale level, for example, when the maximum gray scale level of the light emitting device in the target row is 120, the minimum gray scale level of the target row is 90×60% +30=84, that is the relatively high gray scale level in the target row, that is, the gray scale level in the target row is not the relatively high gray scale level of 84 to 120, and in order to reduce the interference of the light emitting device with the relatively high gray scale level, the light emitting device with respect to the relatively high gray scale level needs to be segmented, and the light emitting device with the relatively high gray scale level needs to be pulled to be 84, and the light emitting device can be determined as the light emitting device with the average gray scale level.
In step S204, the target pull-down voltage required by each light emitting device may be the same voltage value, or different voltage values may be set according to the actual situation or the component characteristics of each light emitting device.
In step S206, the step of sectionally pulling the column line voltage of the first light emitting device by the plurality of voltage output units having different output voltages and the output voltages being equal to or greater than the target pull-down voltage, so as to sectionally pull down the column line voltage of the first light emitting device to the target pull-down voltage includes:
step 1, detecting a line scanning signal of the target line;
and 2, when the start of the row scanning signals is detected, sequentially conducting transistors corresponding to each voltage output unit according to the sequence from the large output voltage to the small output voltage of the voltage output unit so as to pull down the column line voltage to the output voltage of each voltage output unit in sequence, and when the last voltage output unit is conducted, pulling down the column line voltage to the target pull-down voltage.
In the embodiment of the application, the sectional pull-down of the column line voltage is realized through a plurality of voltage output units with different output voltages, the time sequence controller controls each voltage output unit to be connected with the signal line of the target column one by one according to the sequence from the large output voltage to the small output voltage, the target column is the column where the first light emitting device is positioned, so that the column line voltage range of the target column is reduced stepwise and gradually reduced, and finally the last voltage output unit pulls down the column line voltage to the target pull-down voltage, at the moment, the first light emitting device on the column can normally display, and the total pull-down time is prolonged because the pull-down voltage of the column line voltage on the column is divided into a plurality of sections, and the single voltage variation amount and the total variation time are not enough to interfere the light emitting device with low gray scale, thereby solving the technical problem that a highlight picture causes interference influence on the low-bright picture.
Taking three voltage output units as examples, the output voltages of the three voltage output units are V1, V2 and V3 in turn from large to small, and the transistors corresponding to each voltage output unit are T1, T2 and T3, as shown in fig. 3, gn is a row scanning signal of a target row, when Gn generates a rising edge, it is indicated that the row scanning signal of the target row is turned on, sn is a pull-down scheme of a column line voltage in the related art, that is, the column line voltage is pulled down to the minimum directly, such a short-time large-amplitude voltage change is very liable to interfere with a low-gray-scale light emitting device, while a column line voltage pull-down waveform in the technical scheme of the present application is shown as Sn', a time sequence controller firstly turns on the transistor T1, turns off the transistor T2 and the transistor T3 to pull down the column line voltage to V1, after time T1, turns on the transistor T2 again, turns off the transistor T1 and the transistor T3 to pull down the column line voltage to V2, and the time T2 is turned on to pull down the column line voltage to V3 to the first light emitting device normally.
In practical application, the number of the voltage output units and the paired transistors can be set according to practical requirements, and meanwhile, multiple groups of voltage output units and paired transistors can be set, each group corresponds to one column of light emitting devices, and a group of voltage output units and paired transistors can also be set so as to regulate and control the column line voltage of each column through a group of voltage output units and paired transistors.
In the embodiment of the application, when the transistor corresponding to any one of the voltage output units is turned on, the transistors corresponding to the other voltage output units are turned off, the on time length of any one of the transistors is greater than or equal to a first time length threshold, the sum of the on time lengths of all the transistors is greater than a second time length threshold, the first time length threshold is the minimum time length required for completing the pull-down process of each stage, the second time length threshold is the minimum time length for triggering the light-emitting state change of the second light-emitting device by the line voltage change, and the second light-emitting device is the light-emitting device with the gray scale value smaller than the gray scale value of the first light-emitting device in the target row. The second time period threshold value can be set according to actual conditions. The application can divide the pull-down voltage of the high-gray-scale light-emitting device into a plurality of sections and prolong the pull-down time, thereby ensuring that the single voltage variation and the total variation time are not enough to interfere the low-gray-scale light-emitting device, and solving the technical problem that the high-brightness picture has interference influence on the low-brightness picture.
According to another aspect of the embodiment of the present application, there is provided a driving circuit of a display panel, as shown in fig. 4, including a row driving unit 1 and a column driving unit 2, the column driving unit 2 including a timing controller 201, a plurality of voltage output units 202, and a transistor 203 corresponding to each of the voltage output units, wherein:
the row driving unit 1 is configured to send row scanning signals (Scan 1, scan2, scan3, etc.) to the plurality of row light emitting devices LEDs;
the plurality of voltage output units 202 are configured to provide a plurality of output voltages with different magnitudes;
The timing controller 201 is connected to each of the transistors 203, and configured to segment and pull a column line voltage of a first light emitting device on a target row when it is detected that the row scan signal of the target row is turned on, where the method includes: and sequentially switching on transistors corresponding to the voltage output units according to the order from large to small of the output voltages of the voltage output units so as to sequentially pull down the column line voltage controlling the first light emitting device to the output voltage of each voltage output unit until the last voltage output unit is switched on, and pulling down the column line voltage to a target pull-down voltage, wherein the target pull-down voltage is a pull-down voltage required for driving the first light emitting device to emit light.
In the embodiment of the application, the sectional pull-down of the column line voltage is realized through a plurality of voltage output units with different output voltages, the time sequence controller controls each voltage output unit to be connected with the signal line of the target column one by one according to the sequence from the large output voltage to the small output voltage, the target column is the column where the first light emitting device is positioned, so that the column line voltage range of the target column is reduced stepwise and gradually reduced, and finally the last voltage output unit pulls down the column line voltage to the target pull-down voltage, at the moment, the first light emitting device on the column can normally display, and the total pull-down time is prolonged because the pull-down voltage of the column line voltage on the column is divided into a plurality of sections, and the single voltage variation amount and the total variation time are not enough to interfere the light emitting device with low gray scale, thereby solving the technical problem that a highlight picture causes interference influence on the low-bright picture.
Optionally, the timing controller is further configured to control a turn-on duration of each transistor, so that when any one of the transistors corresponding to the voltage output units is turned on, the transistors corresponding to the rest of the voltage output units are turned off, the turn-on duration of any one of the transistors is greater than or equal to a first duration threshold, a sum of the turn-on durations of all the transistors is greater than a second duration threshold, the first duration threshold is a minimum duration required for completing a pull-down process of each stage, the second duration threshold is a minimum duration for triggering a light-emitting state change of a second light-emitting device by the line voltage change, and the second light-emitting device is a light-emitting device with a gray scale value in the target row smaller than a gray scale value of the first light-emitting device.
In the embodiment of the application, the second time threshold can be set according to actual conditions. The application can divide the pull-down voltage of the high-gray-scale light-emitting device into a plurality of sections and prolong the pull-down time, thereby ensuring that the single voltage variation and the total variation time are not enough to interfere the low-gray-scale light-emitting device, and solving the technical problem that the high-brightness picture has interference influence on the low-brightness picture.
Optionally, the timing controller is further configured to: acquiring gray scale values of all light emitting devices of the target row, and determining a maximum gray scale value and a minimum gray scale value in all gray scale values; calculating a difference value between the maximum gray level value and the minimum gray level value; and if the difference value is larger than a preset threshold value, determining a minimum gray level value of a relatively high gray level according to a preset proportion, the maximum gray level value and the minimum gray level value.
Optionally, the column driving unit further includes a counting unit, where the counting unit is connected to the timing controller, the counting unit is configured to mark a light emitting device in the target row with a gray level greater than or equal to the minimum gray level of the relatively high gray level as a first light emitting device, and the timing controller is further configured to determine the first light emitting device as a light emitting device that needs to be pulled in a segmented manner.
The driving method and driving circuit of the display panel according to the present application will be described with reference to fig. 5.
As shown in fig. 5, in the driving circuit of the display panel, the column driving unit includes voltage output units outputting voltages V1, V2, and V3, and each voltage output unit includes transistors T1, T2, and T3 corresponding to each voltage output unit, and further includes a counting unit and a timing controller.
In the driving process of the display panel, when the rows are switched (for example, after Scan1 is closed and before Scan2 is opened), the time schedule controller calculates the difference between the highest gray level and the smallest gray level of the row of Scan2, once the difference exceeds a preset threshold value, the counting unit marks the light emitting devices with high gray level in the row of Scan2 and sends an enabling signal to the time schedule controller, and the row starts the segmented pull-down function. After Scan2 is turned on, the timing controller sends a signal to turn on T1, turn off T2 and T3, and the column line voltage is equal to V1. After time T1, a signal is sent to turn on T2, turn off T1 and T3, and the column line voltage is equal to V2. After time T2, a signal is sent to turn on T3, turn off T1 and T2, and the column line voltage is equal to V3, at which time the column starts to display normally. Because the variation of the voltage is insufficient to cause the false triggering of the low-gray-scale light-emitting device, the technical problem that the high-brightness picture causes interference influence on the low-brightness picture is solved.
According to still another aspect of the embodiments of the present application, there is provided an embodiment of a display panel, as shown in fig. 6, the display panel includes an array substrate 100, a color film substrate 300, and a liquid crystal layer 400 disposed between the array substrate 100 and the color film substrate 300, the array substrate 100 including the driving circuit as described above.
According to still another aspect of the embodiments of the present application, as shown in fig. 7, the display device includes a backlight module 200 and the display panel described above, where the backlight module 200 is disposed on a backlight side of the array substrate 100 and is used for providing a light source to the display panel.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A driving method of a display panel, comprising:
determining a first light emitting device to be subjected to segmented pulling when a plurality of columns of light emitting devices of a target row need to be driven to emit light;
determining a target pull-down voltage required to drive the first light emitting device to emit light;
And carrying out sectional pulling on the column line voltage of the first light emitting device through a plurality of voltage output units with different output voltages and the output voltages being greater than or equal to the target pull-down voltage so as to pull down the column line voltage of the first light emitting device to the target pull-down voltage in a sectional manner.
2. The method of claim 1, wherein the step of sectionally pulling a column line voltage of the first light emitting device to sectionally pull down the column line voltage controlling the first light emitting device to the target pull-down voltage by a plurality of voltage output units each having a different output voltage and each having the output voltage greater than or equal to the target pull-down voltage comprises:
detecting a line scanning signal of the target line;
When the start of the row scanning signals is detected, transistors corresponding to the voltage output units are sequentially conducted according to the sequence from large to small of the output voltages of the voltage output units, so that the column line voltage is sequentially pulled down to the output voltage of each voltage output unit, and the column line voltage is pulled down to the target pull-down voltage until the last voltage output unit is conducted.
3. The method according to claim 2, wherein when the transistor corresponding to any one of the voltage output units is turned on, the transistors corresponding to the other voltage output units are turned off, the on-time length of any one of the transistors is greater than or equal to a first time length threshold, the sum of the on-time lengths of all the transistors is greater than a second time length threshold, the first time length threshold is a minimum time length required for completing the pull-down process of each stage, the second time length threshold is a minimum time length for triggering the light-emitting state change of a second light-emitting device by the line voltage change, and the second light-emitting device is a light-emitting device with a gray scale value smaller than that of the first light-emitting device in the target row.
4. The method of claim 1, wherein the determining that a staged pulling is required for the first light emitting device comprises:
Acquiring gray scale values of all light emitting devices of the target row, and determining a maximum gray scale value and a minimum gray scale value in all gray scale values;
Calculating a difference value between the maximum gray level value and the minimum gray level value;
If the difference value is larger than a preset threshold value, determining a minimum gray level value of a relatively high gray level according to a preset proportion, the maximum gray level value and the minimum gray level value;
and determining a light emitting device with a gray scale value greater than or equal to the minimum gray scale value of the relatively high gray scale in the target row as the first light emitting device.
5. A driving circuit of a display panel, comprising a row driving unit and a column driving unit, wherein the column driving unit comprises a timing controller, a plurality of voltage output units, and transistors corresponding to each of the voltage output units, wherein:
the row driving unit is used for sending a row scanning signal to the multi-row light emitting device;
the voltage output units are used for providing a plurality of output voltages with different magnitudes;
The time schedule controller is connected with each transistor and is used for carrying out segmented pulling on the column line voltage of the first light emitting device on the target row when the starting of the row scanning signal of the target row is detected, and the time schedule controller comprises the following components: and sequentially switching on transistors corresponding to the voltage output units according to the order from large to small of the output voltages of the voltage output units so as to sequentially pull down the column line voltage controlling the first light emitting device to the output voltage of each voltage output unit until the last voltage output unit is switched on, and pulling down the column line voltage to a target pull-down voltage, wherein the target pull-down voltage is a pull-down voltage required for driving the first light emitting device to emit light.
6. The driving circuit according to claim 5, wherein the timing controller is further configured to control a turn-on duration of each of the transistors such that, when the transistor corresponding to any one of the voltage output units is turned on, the transistors corresponding to the remaining voltage output units are turned off, a turn-on duration of any one of the transistors is greater than or equal to a first duration threshold, a sum of turn-on durations of all of the transistors is greater than a second duration threshold, the first duration threshold being a minimum duration required for completing a pull-down process at each stage, the second duration threshold being a minimum duration during which the line voltage change triggers a change in a light emitting state of a second light emitting device, the second light emitting device being a light emitting device having a gray scale value in the target row that is smaller than a gray scale value of the first light emitting device.
7. The drive circuit of claim 5, wherein the timing controller is further configured to:
Acquiring gray scale values of all light emitting devices of the target row, and determining a maximum gray scale value and a minimum gray scale value in all gray scale values;
Calculating a difference value between the maximum gray level value and the minimum gray level value;
And if the difference value is larger than a preset threshold value, determining a minimum gray level value of a relatively high gray level according to a preset proportion, the maximum gray level value and the minimum gray level value.
8. The driving circuit of claim 7, wherein the column driving unit further comprises a counting unit, the counting unit is connected to the timing controller, the counting unit is configured to mark a light emitting device having a gray scale value greater than or equal to the minimum gray scale value of the relatively high gray scale in the target row as a first light emitting device, and the timing controller is further configured to determine the first light emitting device as a light emitting device requiring a segment pull.
9. A display panel comprising an array substrate, a color film substrate and a liquid crystal layer arranged between the array substrate and the color film substrate, wherein the array substrate comprises the driving circuit as claimed in any one of claims 5 to 8.
10. A display device, comprising a backlight module and the display panel according to claim 9, wherein the backlight module is disposed on a backlight side of the array substrate, and is configured to provide a light source for the display panel.
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| CN202410389877.8A CN118173045A (en) | 2024-03-28 | 2024-03-28 | Driving method and driving circuit of display panel, display panel and display device |
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| CN202410389877.8A CN118173045A (en) | 2024-03-28 | 2024-03-28 | Driving method and driving circuit of display panel, display panel and display device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111354305A (en) * | 2018-12-21 | 2020-06-30 | 三星显示有限公司 | Display driver and method of driving the same |
| WO2020243883A1 (en) * | 2019-06-03 | 2020-12-10 | 京东方科技集团股份有限公司 | Pixel circuit, pixel circuit driving method, and display apparatus and driving method therefor |
| CN115810330A (en) * | 2021-09-14 | 2023-03-17 | 上海和辉光电股份有限公司 | Driving method of pixel circuit and display device |
| CN116092439A (en) * | 2023-04-10 | 2023-05-09 | 惠科股份有限公司 | Liquid crystal display device and electronic apparatus |
| CN116110333A (en) * | 2021-11-10 | 2023-05-12 | 乐金显示有限公司 | Display device and data driving circuit |
-
2024
- 2024-03-28 CN CN202410389877.8A patent/CN118173045A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111354305A (en) * | 2018-12-21 | 2020-06-30 | 三星显示有限公司 | Display driver and method of driving the same |
| WO2020243883A1 (en) * | 2019-06-03 | 2020-12-10 | 京东方科技集团股份有限公司 | Pixel circuit, pixel circuit driving method, and display apparatus and driving method therefor |
| CN115810330A (en) * | 2021-09-14 | 2023-03-17 | 上海和辉光电股份有限公司 | Driving method of pixel circuit and display device |
| CN116110333A (en) * | 2021-11-10 | 2023-05-12 | 乐金显示有限公司 | Display device and data driving circuit |
| CN116092439A (en) * | 2023-04-10 | 2023-05-09 | 惠科股份有限公司 | Liquid crystal display device and electronic apparatus |
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