CN115775548A - Display driving chip and polarity inversion pre-charging method and device thereof - Google Patents
Display driving chip and polarity inversion pre-charging method and device thereof Download PDFInfo
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Abstract
The invention provides a display driving chip and a polarity inversion pre-charging method and a device thereof, comprising a first driving signal for outputting a first polarity aiming at a previous pixel; when entering the next pixel driving, outputting a GROUND level driving signal; wherein, the driving signal polarity of the former pixel is different from that of the latter pixel; outputting a second driving signal with a second polarity when the output of the GROUND level is finished; wherein the first polarity is opposite to the second polarity, the second driving signal is close to the GROUND level, and a difference value from the GROUND level is within a preset range; after a preset time, outputting a gray scale signal of a second polarity required by the next pixel; wherein the gray scale signal is greater than the second driving signal. The invention can reduce the voltage difference between the output point of the source driver and the data line of the liquid crystal display device and avoid the electric overload phenomenon.
Description
Technical Field
The invention relates to the technical field of display driving chips, in particular to a display driving chip and a polarity inversion pre-charging method and device thereof.
Background
The liquid crystal display device has the working principle that different voltages are applied to liquid crystal molecules to change the arrangement state of the liquid crystal molecules so as to control the penetration amount of light and output light with different intensities (gray scales); this voltage is usually stored in a storage capacitor on a pixel of the liquid crystal display device, and is generally supplied by a source driver (source driver) of a display driver chip (IC), and is stored in the storage capacitor through a data line of the liquid crystal display device when a thin film transistor of the liquid crystal display device is turned on; in the liquid crystal display device, due to its physical characteristics, the pixel driving voltage needs to be reversed in polarity, and usually the polarity is changed at least once every frame, i.e. the positive polarity is switched to the negative polarity. Since there are many inversion schemes in the design relationship of the liquid crystal display device, the following are common: a Frame Inversion method (Frame Inversion), a Line Inversion method (Line Inversion), a Column Inversion method (Column Inversion), a Dot Inversion method (Dot Inversion), and the like.
Because the operation voltage of the processing components used by the display driving chip is limited, if the same set of drivers can not be used for providing signals with positive and negative polarities, two sets of drivers using voltages with positive and negative polarities respectively provide signals with positive and negative polarities, the positive polarity source driver outputs a positive polarity range voltage, the negative polarity source driver outputs a negative polarity range voltage, and the display driving chip outputs the positive polarity voltage or the negative polarity voltage through the internal switch. If the front and rear pixels have different polarities, closing the positive path if the front pixel outputs a positive voltage, and then outputting a GROUND level, which is generally the middle level of the positive and negative operating voltage range of the driver, stopping outputting the GROUND level after a period of time, and turning on the negative path switch to output a negative driving signal; if the previous pixel outputs negative voltage, the negative path is closed, then the GROUND level is outputted, after a period of time, the GROUND level is stopped being outputted, and the positive path switch is turned on to output the positive driving signal.
However, in the conventional method, the period of outputting the GROUND level is too short, the capacitance load of the data line of the liquid crystal display device causes the charge not to have enough time to complete the charging and discharging, when the output of the GROUND level is finished, the voltage level may be far away from the GROUND level, and if the source driver then outputs the gray level reversely far away from the GROUND level, the voltage difference between the output point of the source driver of the display driving chip and the data line of the liquid crystal display device is too large, which may cause Electrical Overload (EOS) of the components of the display driving chip, thereby causing potential failure and shortening or even damaging the life cycle of the product.
Disclosure of Invention
The invention mainly aims to provide a display driving chip and a polarity inversion pre-charging method and a polarity inversion pre-charging device thereof, aiming at overcoming the defect that components of the display driving chip are electrically overloaded when the polarity of the display driving chip is inverted.
In order to achieve the above object, the present invention provides a polarity inversion pre-charging method for a display driver chip, comprising the following steps:
outputting a first driving signal of a first polarity to a previous pixel; when entering the next pixel drive, outputting a GROUND level drive signal; wherein, the driving signal polarity of the former pixel is different from that of the latter pixel;
outputting a second driving signal with a second polarity when the output of the GROUND level is finished; wherein the first polarity is opposite to the second polarity, the second driving signal is close to the GROUND level, and a difference value from the GROUND level is within a predetermined range;
after a preset time, outputting a gray scale signal of a second polarity required by the next pixel; wherein the gray scale signal is greater than the second driving signal.
Furthermore, the first driving signal of the first polarity and the second driving signal of the second polarity are both output through the source driver of the display driving chip.
Further, the first driving signal of the first polarity and the second driving signal of the second polarity are output by the two sets of source drivers of the display driving chip, which are respectively a positive source driver and a negative source driver.
Further, before the step of outputting the GROUND level driving signal, the method further includes:
stopping outputting the first drive signal of the first polarity;
after the step of outputting the gray scale signal of the second polarity required by the subsequent pixel after the preset time, the method further comprises:
and stopping outputting the gray scale signal of the second polarity when the driving of the next pixel is finished.
Further, before the step of outputting the gray scale signal of the second polarity required by the subsequent pixel, the method further includes:
detecting whether the data line of the display device driven by the display driving chip reaches a GROUND standard position;
if the GROUND level is reached, the step of outputting the gray scale signal of the second polarity required by the next pixel is executed.
Further, the step of outputting a second driving signal of a second polarity includes:
outputting a second driving signal with a second polarity, and controlling the second driving signal to gradually become smaller until the second driving signal is 0;
wherein the second driving signal is gradually decreased at equal intervals;
or, outputting a second driving signal of a second polarity; wherein the second drive signal is a fixed value.
The invention also provides a polarity inversion pre-charging device of a display driving chip, comprising:
a first output unit for outputting a first driving signal of a first polarity to a previous pixel; when entering the next pixel driving, outputting a GROUND level driving signal; wherein, the driving signal polarity of the former pixel is different from that of the latter pixel;
a second output unit, for outputting a second driving signal with a second polarity when the group level output is finished; wherein the first polarity is opposite to the second polarity, the second driving signal is close to the GROUND level, and a difference value from the GROUND level is within a preset range;
a third output unit, configured to output a gray scale signal of a second polarity required by the subsequent pixel after a preset time; wherein the gray scale signal is greater than the second driving signal.
Furthermore, the first driving signal of the first polarity and the second driving signal of the second polarity are both output through the source driver of the display driving chip.
Further, the first driving signal of the first polarity and the second driving signal of the second polarity are output by the two sets of source drivers of the display driving chip, which are respectively a positive source driver and a negative source driver.
The invention also provides a display driving chip, wherein a computer program is stored in the display driving chip, and the display driving chip realizes the steps of any one of the methods when executing the computer program.
The invention provides a display driving chip and a polarity inversion pre-charging method and a device thereof, comprising a first driving signal for outputting a first polarity aiming at a previous pixel; when entering the next pixel driving, outputting a GROUND level driving signal; wherein, the driving signal polarity of the former pixel is different from that of the latter pixel; outputting a second driving signal of a second polarity when the GROUND level is finished; wherein the first polarity is opposite to the second polarity, the second driving signal is close to the GROUND level, and a difference value from the GROUND level is within a predetermined range; after a preset time, outputting a gray scale signal of a second polarity required by the next pixel; wherein the gray scale signal is greater than the second driving signal. When the output of the GROUND level is stopped, the voltage difference from the output point of the source driver to the data line of the liquid crystal display device can be reduced by outputting the second driving signal close to the GROUND level in advance, so that the electric overload phenomenon is avoided; meanwhile, the data lines of the liquid crystal display device can reach the GROUND level more quickly.
Drawings
FIG. 1 is a schematic diagram illustrating a polarity inversion pre-charging method for a display driver chip according to an embodiment of the present invention;
FIG. 2 is a schematic diagram comparing the scheme of the present invention with the conventional scheme;
FIG. 3 is a block diagram of a polarity inversion pre-charging device of a display driver chip according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, an embodiment of the present invention provides a polarity inversion precharging method for a display driving chip, including the following steps:
step S1, outputting a first driving signal of a first polarity for a previous pixel; when entering the next pixel driving, outputting a GROUND level driving signal; wherein, the driving signal polarity of the former pixel is different from that of the latter pixel;
step S2, outputting a second driving signal with a second polarity when the output of the GROUND level is finished; wherein the first polarity is opposite to the second polarity, the second driving signal is close to the GROUND level, and a difference value from the GROUND level is within a preset range;
step S3, after the preset time, outputting a gray scale signal of a second polarity required by the next pixel; wherein the gray scale signal is greater than the second driving signal.
In this embodiment, the polarity inversion pre-charging method of the display driving chip is applied to a scene that the front and rear pixels are driven with different polarities, and if the front pixel adopts the positive polarity driving signal, the rear pixel adopts the negative polarity driving signal. When the previous pixel enters the driving of the next pixel, the driving signal of the previous pixel needs to be stopped, then a GROUND level is output, after a period of time, the GROUND level is stopped, and finally a driving signal of the other polarity is output after a period of time. In the above process, since the time period for outputting the GROUND level is short, after the output of the GROUND level is stopped, the data line of the liquid crystal display device cannot reach the GROUND level immediately, and at this time, the gray level which is reversely far away from the GROUND is output, and the voltage difference between the output point of the source driver of the display driving chip and the data line of the display device is too large, which may cause the electrical overload of the components of the display driving chip.
Therefore, in this embodiment, as described in steps S1-S2, when the next pixel driving is performed, the driving signal of the GROUND level is output, and when the output of the GROUND level is finished, the data line of the display device cannot reach the GROUND level because the output of the GROUND level is just finished; at this time, a second driving signal with a second polarity is output, and the second driving signal is closest to the GROUND level to generate a pre-charging effect, so that the voltage difference between the output point of the source driver and the data line of the liquid crystal display device can be reduced, the electrical overload phenomenon is avoided, and the product cannot be damaged; meanwhile, compared with the traditional scheme that only the GROUND level is output, the data line of the liquid crystal display device can reach the GROUND level more quickly. (refer to FIG. 2)
In this embodiment, in order to make the second driving signal closest to the GROUND level, the difference between the second driving signal and the GROUND level may be controlled within a small predetermined range.
Finally, as stated in the above step S3, after the predetermined time, the gray-scale signal of the second polarity required by the subsequent pixel is output, so as to complete the process of polarity inversion from the previous pixel to the subsequent pixel.
In this embodiment, during the period of polarity inversion from the previous pixel to the next pixel, not only the GROUND level but also the gray level signal close to the GROUND level are outputted, so that the voltage difference between the output point of the source driver and the data line of the liquid crystal display device can be reduced, and the data line of the liquid crystal display device can reach the GROUND level more quickly.
In an embodiment, the first driving signal of the first polarity and the second driving signal of the second polarity are both output through a source driver of the display driving chip.
In an embodiment, the first driving signal of the first polarity and the second driving signal of the second polarity are output by two sets of source drivers of the display driving chip, which are a positive source driver and a negative source driver, respectively.
In an embodiment, before the step of outputting the GROUND level driving signal, the method further includes:
stopping outputting the first drive signal of the first polarity;
after the step of outputting the gray scale signal of the second polarity required by the subsequent pixel after the preset time, the method further comprises:
and stopping outputting the gray scale signal of the second polarity when the driving of the next pixel is finished.
In this embodiment, when the source driver of the display driver chip outputs the driving signal with the opposite polarity, the specific processes are followed, namely outputting the first driving signal with the first polarity, outputting the driving signal with the GROUND level, outputting the second driving signal with the second polarity close to the GROUND level, and outputting the gray scale signal with the second polarity; when the previous stage enters the next stage, the driving signal output of the previous stage needs to be stopped. Stopping outputting the first driving signal with the first polarity, and then outputting the driving signal with GROUND level; stopping outputting the driving signal with GROUND level, and then outputting a second driving signal with a second polarity close to GROUND level; stopping outputting the second driving signal with the second polarity close to the GROUND level, and then outputting the gray scale signal with the second polarity; and finally, stopping outputting the gray scale signal of the second polarity.
In an embodiment, before the step of outputting the gray scale signal of the second polarity required by the subsequent pixel, the method further includes:
detecting whether the data line of the display device driven by the display driving chip reaches a GROUND standard position;
if the GROUND level is reached, the step of outputting the gray scale signal of the second polarity required by the next pixel is executed.
In this embodiment, when the data line of the display device driven by the display driver chip does not reach the GROUND level, the voltage difference between the data line of the display device and the output point of the source driver of the display driver chip is too large, which may cause an electrical overload phenomenon. Therefore, it is possible to detect whether the data line of the display device driven by the display driver chip reaches the GROUND level, and if the data line reaches the GROUND level, the gray scale signal of the second polarity required by the next pixel is output; if not, the second driving signal close to the GROUND level may be continuously output, or the data line of the display device may be waited for the discharge completion to reach the GROUND level.
In the above embodiment, the step of outputting a second driving signal of a second polarity includes:
outputting a second driving signal of a second polarity; wherein the second drive signal is a fixed value.
Or outputting a second driving signal with a second polarity, and controlling the second driving signal to gradually become smaller until the second driving signal is 0.
In this embodiment, in order to make the data line of the display device reach the GROUND level quickly, a larger second driving signal may be output first, and as the data line of the display device gradually discharges to reach the GROUND level, the second driving signal may be controlled to become gradually smaller until it is 0. It is understood that, in the process of controlling the second driving signal to gradually decrease to 0, the second driving signal may be controlled to be uniformly decreased at equal intervals, or may be controlled to be decreased at irregular intervals.
In another embodiment, the step of outputting a second driving signal of a second polarity when the outputting of the GROUND level is finished includes:
detecting the voltage of a data line of the display device when the GROUND level is finished to be output;
acquiring the time period for outputting the GROUND reference position;
acquiring a discharge parameter of a data line of the display device;
inputting the voltage of a data line of the display device, the discharge parameter, the voltage parameter of a second driving signal and the time period of outputting the GROUND level into a preset time prediction model, and predicting the time of outputting the second driving signal; the time prediction model is a deep learning model trained and completed according to batch sample data;
and outputting the second driving signal with the second polarity according to the predicted time for outputting the second driving signal.
In this embodiment, the deep learning model is trained in advance to obtain a time prediction model, which inputs the voltage, the discharge parameter, the voltage parameter of the second driving signal and the time duration of the GROUND level, and outputs the result as the time for outputting the second driving signal. With this time prediction model, the time to output with the second driving signal can be predicted, which is sufficient to discharge the voltage of the data line of the display device to the GROUND level when the time arrives. Conveniently, the voltage of the data line of the display device can be discharged to the GROUND level before the outputting of the second driving signal of the second polarity is finished.
Referring to fig. 3, an embodiment of the present invention further provides a polarity inversion precharging device for a display driving chip, including:
a first output unit for outputting a first driving signal of a first polarity to a previous pixel; when entering the next pixel driving, outputting a GROUND level driving signal; wherein, the driving signal polarity of the former pixel is different from that of the latter pixel;
a second output unit, for outputting a second driving signal with a second polarity when the output of the GROUND level is finished; wherein the first polarity is opposite to the second polarity, the second driving signal is close to the GROUND level, and a difference value from the GROUND level is within a preset range;
a third output unit, configured to output a gray scale signal of a second polarity required by the subsequent pixel after a preset time; wherein the gray scale signal is greater than the second driving signal.
In this embodiment, the polarity inversion pre-charging apparatus of the display driving chip is applied to a scene that the front and rear pixels are driven with different polarities, and if the front pixel adopts a positive polarity driving signal, the rear pixel adopts a negative polarity driving signal. When the previous pixel enters the driving of the next pixel, the driving signal of the previous pixel needs to be stopped, then a GROUND level is output, after a period of time, the GROUND level is stopped, and finally a driving signal of the other polarity is output after a period of time. In the above process, since the time period for outputting the GROUND level is short, after the output of the GROUND level is stopped, the data line of the liquid crystal display device cannot reach the GROUND level immediately, and at this time, the gray level which is reversely far away from the GROUND is output, and the voltage difference between the output point of the source driver of the display driving chip and the data line of the display device is too large, which may cause the electrical overload of the components of the display driving chip.
Therefore, in this embodiment, as described in the first and second output units, when the subsequent pixel driving is performed, the driving signal of the GROUND level is output, and when the output of the GROUND level is finished, the data line of the display device cannot reach the GROUND level because the output of the GROUND level is just finished; at this time, a second driving signal with a second polarity is output, and the second driving signal is closest to the GROUND level to generate a pre-charging effect, so that the voltage difference between the output point of the source driver and the data line of the liquid crystal display device can be reduced, the electrical overload phenomenon is avoided, and the product cannot be damaged; meanwhile, compared with the traditional scheme that only the GROUND level is output, the data line of the liquid crystal display device can reach the GROUND level more quickly.
In this embodiment, in order to make the second driving signal closest to the GROUND level, the difference between the second driving signal and the GROUND level can be controlled within a small predetermined range.
Finally, as stated in the third output unit, after a predetermined time, the gray-scale signal of the second polarity required by the subsequent pixel is output, so as to complete the process of polarity inversion from the previous pixel to the subsequent pixel.
In this embodiment, during the period of polarity inversion from the previous pixel to the next pixel, not only the GROUND level but also the gray level signal close to the GROUND level are outputted, so that the voltage difference between the output point of the source driver and the data line of the liquid crystal display device can be reduced, and the data line of the liquid crystal display device can reach the GROUND level more quickly.
In an embodiment, the first driving signal of the first polarity and the second driving signal of the second polarity are both output through a source driver of the display driving chip.
In an embodiment, the first driving signal of the first polarity and the second driving signal of the second polarity are output by two sets of source drivers of the display driving chip, which are a positive source driver and a negative source driver, respectively.
In an embodiment, the polarity inversion pre-charging apparatus of the display driver chip further includes:
a first stopping unit for stopping outputting the first driving signal of the first polarity;
and the second stopping unit is used for stopping outputting the gray scale signal of the second polarity when the driving of the next pixel is finished.
In an embodiment, the polarity inversion pre-charging apparatus of the display driver chip further includes:
the detection unit is used for detecting whether the data line of the display device driven by the display driving chip reaches a GROUND standard position;
if the GROUND level is reached, the third output unit outputs the second polarity gray scale signal required by the next pixel.
In an embodiment, the second output unit is specifically configured to:
outputting a second driving signal with a second polarity, and controlling the second driving signal to gradually become smaller until the second driving signal is 0;
wherein the second driving signal is gradually decreased at equal intervals.
In another embodiment, the second output unit is specifically configured to:
when the GROUND level is output, detecting the voltage of a data line of the display equipment;
acquiring the time period for outputting the GROUND reference position;
acquiring a discharge parameter of a data line of the display device;
inputting the voltage of the data line of the display device, the discharge parameter, the voltage parameter of the second driving signal and the time period of outputting the GROUND level into a preset time prediction model, and predicting the time of outputting the second driving signal; the time prediction model is a deep learning model trained and completed according to batch sample data;
and outputting the second driving signal with the second polarity according to the predicted time for outputting the second driving signal.
In this embodiment, the deep learning model is trained in advance to obtain a time prediction model, which inputs the voltage, the discharge parameter, the voltage parameter of the second driving signal and the time duration of the GROUND level, and outputs the result as the time for outputting the second driving signal. With this time prediction model, the time to output with the second driving signal can be predicted, which is sufficient to discharge the voltage of the data line of the display device to the GROUND level when the time arrives. Conveniently, the voltage of the data line of the display device can be discharged to the GROUND level before the outputting of the second driving signal of the second polarity is finished.
In this embodiment, please refer to the method described in the above embodiment for the specific implementation of each unit in the above apparatus embodiment, which is not described herein again.
In another embodiment, the present invention further provides a display driver chip, where a computer program is stored in the display driver chip, and the display driver chip implements the steps of any one of the above methods when executing the computer program.
In summary, the display driver chip and the polarity inversion pre-charging method and apparatus thereof provided in the embodiments of the invention include outputting a first driving signal of a first polarity to a previous pixel; when entering the next pixel driving, outputting a GROUND level driving signal; wherein, the driving signal polarity of the former pixel is different from that of the latter pixel; outputting a second driving signal with a second polarity when the output of the GROUND level is finished; wherein the first polarity is opposite to the second polarity, the second driving signal is close to the GROUND level, and a difference value from the GROUND level is within a preset range; after a preset time, outputting a gray scale signal of a second polarity required by the next pixel; wherein the gray scale signal is greater than the second driving signal. When the output of the GROUND level is stopped, the voltage difference from the output point of the source driver to the data line of the liquid crystal display device can be reduced by outputting the second driving signal close to the GROUND level in advance, so that the electric overload phenomenon is avoided; meanwhile, the data lines of the liquid crystal display device can reach the GROUND level more quickly.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media provided herein or used in embodiments of the present invention may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (SSRDRAM), enhanced SDRAM (ESDRAM), synchronous Link (Synchlink) DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct bused dynamic RAM (DRDRAM), and bused dynamic RAM (RDRAM).
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, apparatus, article, or method that comprises the element.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A polarity inversion pre-charging method of a display driving chip is characterized by comprising the following steps:
outputting a first driving signal of a first polarity to a previous pixel; when entering the next pixel driving, outputting a GROUND level driving signal; wherein, the driving signal polarity of the former pixel is different from that of the latter pixel;
outputting a second driving signal of a second polarity when the GROUND level is finished; wherein the first polarity is opposite to the second polarity, the second driving signal is close to the GROUND level, and a difference value from the GROUND level is within a preset range;
after a preset time, outputting a gray scale signal of a second polarity required by the next pixel; wherein the gray scale signal is greater than the second driving signal.
2. The polarity inversion precharging method of display driving chip as claimed in claim 1, wherein the first driving signal of the first polarity and the second driving signal of the second polarity are both outputted by the source driver of the display driving chip.
3. The polarity inversion precharging method of a display driving chip according to claim 1, wherein the first driving signal of the first polarity and the second driving signal of the second polarity are outputted by two groups of source drivers of the display driving chip, respectively being a positive polarity source driver and a negative polarity source driver.
4. The method of claim 1, further comprising, before the step of outputting the driving signal with GROUND level, the steps of:
stopping outputting the first drive signal of the first polarity;
after the step of outputting the gray scale signal of the second polarity required by the subsequent pixel after the preset time, the method further comprises:
and stopping outputting the gray scale signal of the second polarity when the driving of the next pixel is finished.
5. The polarity inversion precharging method of display driving chip as claimed in claim 1, wherein before the step of outputting the gray scale signal of the second polarity required by the subsequent pixel, further comprising:
detecting whether the data line of the display device driven by the display driving chip reaches a GROUND standard position;
if the GROUND level is reached, the step of outputting the gray scale signal of the second polarity required by the next pixel is executed.
6. The polarity inversion precharging method of a display driving chip according to claim 1, wherein the step of outputting a second driving signal of a second polarity comprises:
outputting a second driving signal with a second polarity, and controlling the second driving signal to gradually become smaller until the second driving signal is 0;
wherein the second driving signal is gradually decreased at equal intervals;
or, outputting a second driving signal of a second polarity; wherein the second drive signal is a fixed value.
7. A polarity inversion pre-charging device of a display driving chip is characterized by comprising:
a first output unit for outputting a first driving signal of a first polarity to a previous pixel; when entering the next pixel driving, outputting a GROUND level driving signal; wherein, the driving signal polarity of the former pixel is different from that of the latter pixel;
a second output unit, for outputting a second driving signal with a second polarity when the group level output is finished; wherein the first polarity is opposite to the second polarity, the second driving signal is close to the GROUND level, and a difference value from the GROUND level is within a preset range;
a third output unit, configured to output a gray scale signal of a second polarity required by the subsequent pixel after a preset time; wherein the gray scale signal is greater than the second driving signal.
8. The polarity inversion precharging device of claim 7, wherein the first driving signal of the first polarity and the second driving signal of the second polarity are both outputted by the source driver of the display driving chip.
9. The polarity inversion pre-charge apparatus of claim 7, wherein the first driving signal of the first polarity and the second driving signal of the second polarity are outputted by two sets of source drivers of the display driving chip, which are a positive source driver and a negative source driver respectively.
10. A display driver chip having a computer program stored therein, wherein the display driver chip implements the steps of the method according to any one of claims 1 to 6 when executing the computer program.
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| CN115775548B (en) | 2023-04-14 |
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