CN115798388A - Display panel driving method, driving device and display device - Google Patents
Display panel driving method, driving device and display device Download PDFInfo
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- CN115798388A CN115798388A CN202211673074.2A CN202211673074A CN115798388A CN 115798388 A CN115798388 A CN 115798388A CN 202211673074 A CN202211673074 A CN 202211673074A CN 115798388 A CN115798388 A CN 115798388A
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Abstract
The invention discloses a driving method and a driving device of a display panel and a display device. The display panel comprises a plurality of sub-pixels, each sub-pixel comprises a pixel circuit and a light-emitting unit, and the pixel circuit is used for driving the light-emitting unit to emit light; the pixel circuit includes a driving transistor; one drive cycle of the sub-pixel comprises a write phase and a hold phase; the driving method of the display panel comprises the following steps: determining the current picture refreshing frequency of the display panel; determining the holding voltage of the display panel according to the current picture refreshing frequency; wherein, the corresponding holding voltages of different picture refreshing frequencies are different; writing the holding voltage to the source of the drive transistor during the holding phase. The embodiment of the invention can improve the display effect of the display panel.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving method and a driving apparatus for a display panel, and a display apparatus.
Background
With the rapid development of display technologies, people have increasingly high display requirements on display panels. However, the conventional display panel has a problem of brightness change in the display process, which affects the display effect of the display panel.
Disclosure of Invention
The invention provides a driving method and a driving device of a display panel and a display device, and aims to improve the display effect of the display panel.
According to an aspect of the present invention, there is provided a driving method of a display panel including a plurality of sub-pixels including a pixel circuit and a light emitting unit, the pixel circuit for driving the light emitting unit to emit light; the pixel circuit includes a driving transistor; one drive cycle of the sub-pixel comprises a write phase and a hold phase;
the method comprises the following steps:
determining the current picture refreshing frequency of the display panel;
determining the holding voltage of the display panel according to the current picture refreshing frequency; wherein, the corresponding holding voltages of different picture refreshing frequencies are different;
writing the holding voltage to the source of the drive transistor during the holding phase.
Optionally, before determining the holding voltage of the display panel according to the current screen refresh frequency, the method further includes:
determining the current display brightness level of the display panel, wherein the minimum display brightness corresponding to different display brightness levels is the same, and the maximum display brightness is different;
determining a holding voltage of the display panel according to the current picture refresh frequency comprises:
determining the holding voltage according to the current picture refreshing frequency and the current display brightness level; and under the same frame refreshing frequency, the holding voltage of at least part of display brightness grades is different from the holding voltage of other display brightness grades.
Optionally, under the same frame refresh frequency: the holding voltages for different display brightness levels are different, or the holding voltages for different ranges of display brightness levels are different.
Optionally, the hold phase comprises a plurality of hold frames;
writing the holding voltage to the source of the drive transistor in the holding phase, including:
writing the holding voltage to the source of the drive transistor at each of the holding frames.
Optionally, the display panel stores at least two different display brightness levels and at least two different frame refresh frequencies of holding voltages;
determining the holding voltage according to the current picture refresh frequency and the current display brightness level comprises:
searching for a holding voltage corresponding to the current display brightness level and the current picture refreshing frequency in the display panel, and if the holding voltage corresponding to the current display brightness level and the current picture refreshing frequency is stored in the display panel, acquiring the holding voltage from the display panel; and if the holding voltage corresponding to the current display brightness grade and the current picture refreshing frequency is not stored in the display panel, interpolating and determining the holding voltage corresponding to the current display brightness grade and the current picture refreshing frequency according to the holding voltages of at least two different display brightness grades and at least two different picture refreshing frequencies stored in the display panel.
Optionally, the writing phase includes at least one writing frame; each writing frame comprises a data writing sub-stage and a light emitting sub-stage, and each holding frame comprises a light emitting sub-stage;
before writing the holding voltage to the source of the driving transistor in the holding phase, the method further includes:
writing a data voltage into the gate of the driving transistor in a data writing sub-stage of each writing frame, and controlling the driving transistor to drive the light-emitting unit to emit light in a light-emitting sub-stage of each writing frame;
the driving method further includes:
and controlling the driving transistor to drive the light-emitting unit to emit light in the light-emitting sub-phase of each holding frame.
Optionally, the picture refresh frequency of the display panel is greater than or equal to 1Hz and less than or equal to 120Hz.
According to another aspect of the present invention, there is provided a driving apparatus of a display panel including a plurality of sub-pixels including a pixel circuit and a light emitting unit, the pixel circuit for driving the light emitting unit to emit light; the pixel circuit includes a driving transistor; one drive cycle of the sub-pixel comprises a write phase and a hold phase;
the driving device includes:
the frequency determining module is used for determining the current picture refreshing frequency of the display panel;
the holding voltage determining module is used for determining the holding voltage of the display panel according to the current picture refreshing frequency; wherein, the corresponding holding voltages of different picture refreshing frequencies are different;
and the holding voltage writing module is used for writing the holding voltage to the source of the driving transistor in the holding stage.
Optionally, the apparatus further comprises:
the display brightness grade determining module is used for determining the current display brightness grade of the display panel before determining the holding voltage of the display panel according to the current picture refreshing frequency, wherein the minimum display brightness corresponding to different display brightness grades is the same, and the maximum display brightness is different;
the holding voltage determining module is further used for determining the holding voltage according to the current picture refreshing frequency and the current display brightness level; wherein, under the same picture refreshing frequency, the holding voltage of at least part of display brightness grades is different from the holding voltage of other display brightness grades.
According to another aspect of the present invention, there is provided a display device including a display panel and a driving device of the display panel according to any embodiment of the present invention.
The driving method of the display panel provided by the embodiment of the invention sets different holding voltages corresponding to different picture refreshing frequencies, determines the holding voltage of the display panel according to the current picture refreshing frequency, writes the holding voltage into the source electrode of the driving transistor in the holding stage, and performs targeted compensation according to the data voltage attenuation conditions of different picture refreshing frequencies, so that the Vgs voltage value is kept relatively stable in the whole driving period under each picture refreshing frequency, the characteristics of the driving transistor are relatively stable in the same driving period, the brightness difference of the holding stage and the writing stage in the next driving period under each picture refreshing frequency is smaller, and the display effect of the display panel is improved.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a driving method of a display panel according to an embodiment of the present invention;
FIG. 2 is a diagram of a sub-pixel according to an embodiment of the present invention;
FIG. 3 is a graph of luminance difference data of a display panel according to an embodiment of the present invention;
FIG. 4 is a graph of luminance difference data for another display panel according to an embodiment of the present invention
Fig. 5 is a schematic diagram of a driving apparatus of a display panel according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As mentioned in the background art, the conventional display panel has a luminance variation at the time of display, and the inventors found through research that the reason why such a problem occurs is that: when the display panel displays a picture at a low picture refresh frequency, one driving cycle (corresponding to one frame of the displayed picture) generally includes a writing phase and a holding phase, the writing phase generally includes a writing frame, and the holding phase includes a plurality of holding frames. When writing frame, writing data voltage into the drive transistor, and after the drive transistor drives the light-emitting unit to emit light, entering into a holding stage. In the holding stage, the data voltage is not written in the holding frame, and the driving transistor generates a driving current according to the data voltage stored in the storage capacitor. When a frame is kept, the storage capacitor has a leakage phenomenon, the data voltage stored by the storage capacitor can be attenuated, so that the driving current generated by the driving transistor is changed, and further the brightness of the light emitting unit is changed, so that the display brightness of the display panel is different between the writing frame and the keeping frame, namely, the brightness of the display panel displaying a frame can be changed, and the display effect of the display panel is influenced.
In view of the above problem, an embodiment of the present invention provides a driving method of a display panel, fig. 1 is a flowchart of the driving method of the display panel provided by the embodiment of the present invention, fig. 2 is a schematic diagram of a sub-pixel provided by the embodiment of the present invention, referring to fig. 1 and fig. 2, the display panel includes a plurality of sub-pixels, each of the sub-pixels includes a pixel circuit 101 and a light emitting unit 102, and the pixel circuit 101 is used for driving the light emitting unit 102 to emit light; the pixel circuit 101 includes a driving transistor T2; one driving period of the sub-pixel includes a writing phase and a holding phase;
the method comprises the following steps:
and S110, determining the current picture refreshing frequency of the display panel.
The frame refresh rate, i.e. the speed of frame update on the screen, indicates how many frames of frames are displayed per second. The current picture refresh frequency is the picture refresh frequency that is currently being employed. One driving period corresponds to displaying one frame of picture. Illustratively, the current picture refresh frequency may be 1Hz, 10Hz, 30Hz, etc.
S120, determining the holding voltage of the display panel according to the current picture refreshing frequency; wherein, the holding voltage corresponding to different picture refreshing frequencies is different.
And S130, writing the holding voltage into the source of the driving transistor in the holding stage.
In particular, the write phase may comprise at least one write frame. Referring to fig. 2, in each writing frame of the writing phase, a data voltage is written to the storage capacitor 1013 and the gate of the driving transistor T2 through the data writing unit 1011, the driving transistor T2 and the compensation unit 1012, and the driving transistor T2 generates a driving current according to the data voltage to drive the light emitting unit 102 to emit light. While the data writing unit 1011 can write the holding voltage to the source of the driving transistor T2 in the holding phase, the present embodiment can compensate the potential change of the gate of the driving transistor T2 due to the leakage by writing the holding voltage to the source of the driving transistor T2 in the holding phase, adjusting the voltage difference Vgs between the gate of the driving transistor T2 and the source of the driving transistor, and reducing the brightness difference between the holding phase and the writing phase. And because the data voltages corresponding to the same gray scale are different under different frame refreshing frequencies, the attenuation conditions of the data voltages are different in the data holding stage, and the corresponding holding voltages of different frame refreshing frequencies are set to be different, and targeted compensation is performed according to the attenuation conditions of the data voltages of different frame refreshing frequencies, so that Vgs voltage values are kept relatively stable in the same driving period under all frame refreshing frequencies, the characteristics of the driving transistor are relatively stable in the same driving period, the brightness difference of the holding stage and the writing stage in one driving period under each frame refreshing frequency is smaller, and the display effect of the display panel is improved.
In addition, the holding voltage is written to the source of the driving transistor in the holding phase, the holding voltage may be written to the source of the driving transistor for the entire period in which the data line connected to the subpixel does not need to write the data voltage to the gate of the driving transistor in the holding phase, or the holding voltage may be written to the source of the driving transistor for a partial period in which the data line connected to the subpixel does not need to write the data voltage to the gate of the driving transistor in the holding phase. For example, the holding phase may include a plurality of holding frames, and the holding voltage may be written to the source of the driving transistor in each of the holding frames or may be written to the source of the driving transistor in a part of the holding frames.
The driving method of the display panel provided by the embodiment of the invention sets different holding voltages corresponding to different picture refreshing frequencies, determines the holding voltage of the display panel according to the current picture refreshing frequency, writes the holding voltage into the source electrode of the driving transistor in the holding stage, and performs targeted compensation according to the data voltage attenuation conditions of different picture refreshing frequencies, so that the Vgs voltage value is kept relatively stable in the whole driving period under each picture refreshing frequency, the characteristics of the driving transistor are relatively stable in the same driving period, the brightness difference of the holding stage and the writing stage in the next driving period under each picture refreshing frequency is smaller, and the display effect of the display panel is improved.
Optionally, before determining the holding voltage of the display panel according to the current screen refresh frequency, the method further includes:
determining the current display brightness level of the display panel, wherein the minimum display brightness corresponding to different display brightness levels is the same, and the maximum display brightness is different;
determining the holding voltage of the display panel according to the current picture refresh frequency includes:
determining a holding voltage according to the current frame refreshing frequency and the current display brightness level; wherein, under the same picture refreshing frequency, the holding voltage of at least part of display brightness grades is different from the holding voltage of other display brightness grades.
The minimum display luminances corresponding to different display luminance levels (DBVs) are all 0, and the maximum display luminances corresponding to different display luminance levels vary from, for example, several nits to several hundred nits, and exemplary maximum display luminances may include 2nit, 5nit, 10nit, 90nit, 100nit, 300nit, 500nit, 800nit, and the like. The brightness range displayable at each display brightness level can be divided into 2 n The gray levels can be divided into 0-255 gray levels or 0-1023 gray levels, for example, and the brightness of the same gray level is different under different display brightness levels. The current display brightness level of the display panel is the display brightness level currently adopted by the display panel.
TABLE 1
Table 1 is a brightness difference data table of a writing phase and a holding phase according to an embodiment of the present invention, fig. 3 is a brightness difference data graph of a display panel according to an embodiment of the present invention, and fig. 4 is a brightness difference data graph of another display panel according to an embodiment of the present invention. Referring to table 1, fig. 3 and fig. 4, table 1 shows DB values of the display panel when the same holding voltage is applied to a plurality of different screen refresh frequencies and a plurality of different display brightness levels, wherein the DB values are measured by an optical device, such as CA410, and reflect brightness changes of the display panel, and the larger the absolute value of the DB value, the smaller the brightness change, i.e., the smaller the flicker. In table 1, #1 and #2 represent different display panels, respectively. The display brightness levels are characterized by the maximum brightness in table 1, for example, the brightness of 2nit in table 1 represents the display brightness level with the maximum display brightness of 2 nit. Fig. 3 is a line graph drawn according to the DB values of the #1 display panel, and fig. 4 is a line graph drawn according to the DB values of the #2 display panel. Referring to table 1, fig. 3, and fig. 4, when the same holding voltage is used for all display luminance levels of all the screen refresh frequencies, luminance change conditions are different at different frequencies, and some screen refresh frequencies have poor display effects and some display luminance levels have poor display effects. DB value: the luminance change was largest at 120Hz 60Hz > -1Hz > -10Hz > -30Hz, and the effect was the worst at 30 Hz.
In the embodiment, different holding voltages are adopted by setting different picture refreshing frequencies, and at least part of the holding voltages of the display brightness grades under the same picture refreshing frequency are different from the holding voltages of other display brightness grades, so that the characteristics of the driving transistors in the holding stage and the writing stage under each display brightness grade under each picture refreshing frequency are relatively stable, the brightness difference between the holding stage and the writing stage is small, and the display effect is good.
In addition, the holding voltage for each display luminance level can be obtained by experimental debugging in advance for each screen refresh frequency, different holding voltages can be written to the source of the driving transistor for each display luminance level, the luminance difference between the data writing stage and the data holding stage of the display panel is detected, and the holding voltage corresponding to the minimum luminance difference is used as the holding voltage corresponding to the display luminance level. In other embodiments, the holding voltage may be derived by a formula or empirically.
Optionally, under the same frame refresh frequency: the holding voltages for different display brightness levels are different, or the holding voltages for different ranges of display brightness levels are different.
Specifically, the display brightness ranges of different display brightness levels are different, the ranges of the data voltages under different display brightness levels are different, different holding voltages are corresponding to different display brightness levels through setting different holding voltages, the holding voltage adopted by each display brightness level is enabled to be in accordance with the data voltage range, the characteristics of the driving transistor in the holding stage and the writing stage under each display brightness level are enabled to be relatively stable, the brightness difference of the holding stage and the writing stage is enabled to be smaller, good compensation effects are achieved under different display brightness levels, and the display effect of the display panel is further improved.
In another embodiment, the display luminance levels with the approximate maximum display luminance may be divided into a display luminance level range according to the maximum display luminance corresponding to the display luminance level, and the holding voltages corresponding to all the display luminance levels in each display luminance level range are the same. Illustratively, the display luminance gradations corresponding to the maximum display luminances 1nit, 2nit, 3nit, 4nit, and 5nit are divided within one display luminance gradation range, and then the holding voltages of the display luminance gradations corresponding to the maximum display luminances 1nit, 2nit, 3nit, 4nit, and 5nit are the same. Therefore, the number of stored holding voltages can be reduced, and the storage space of the driving chip is saved.
Optionally, the hold phase comprises a plurality of hold frames;
writing a holding voltage to the source of the drive transistor in a holding phase, comprising:
a holding voltage is written to the source of the drive transistor every holding frame.
Specifically, the holding voltage may be written to the source of the driving transistor all the time in the entire frame of each holding frame. By writing the holding voltage into the source electrode of the driving transistor in each holding frame, the brightness difference between each holding frame and the writing stage is small, and the display effect of the display panel is improved.
Optionally, the display panel stores at least two holding voltages with different display brightness levels and at least two different picture refresh frequencies;
determining the holding voltage according to the current picture refresh frequency and the current display brightness level comprises:
searching a holding voltage corresponding to the current display brightness level and the current picture refreshing frequency in the display panel, and if the holding voltage corresponding to the current display brightness level and the current picture refreshing frequency is stored in the display panel, acquiring the holding voltage from the display panel; and if the holding voltage corresponding to the current display brightness grade and the current picture refreshing frequency is not stored in the display panel, interpolating and determining the holding voltage corresponding to the current display brightness grade and the current picture refreshing frequency according to the holding voltages of at least two different display brightness grades and at least two different picture refreshing frequencies stored in the display panel.
Specifically, if the display panel stores the holding voltage corresponding to the current screen refresh frequency and the current display luminance level, the corresponding holding voltage is directly obtained from the display panel, and the holding voltage is written into the source of the driving transistor.
If the holding voltage corresponding to the current display brightness level at the current picture refreshing frequency is not stored in the display panel, but the holding voltages of other display brightness levels at the current picture refreshing frequency are stored in the display panel, the holding voltage corresponding to the current display brightness level can be directly determined according to the interpolation of the holding voltages of other display brightness levels at the current display brightness level. For example, if the display panel stores the holding voltages corresponding to the display luminance ranks having the maximum display luminance of 800nit and 500nit at the current screen refresh frequency and the maximum display luminance corresponding to the current display luminance rank is 700nit, the holding voltage corresponding to the current display luminance rank is determined by directly performing interpolation based on the display luminance rank having the maximum display luminance of 500nit and the holding voltage corresponding to the display luminance rank having the maximum display luminance of 800 nit.
If the holding voltage corresponding to the current picture refreshing frequency is not stored in the display panel, the holding voltage of the current display brightness level at the current picture refreshing frequency can be determined according to the interpolation of the holding voltages of other picture refreshing frequencies. For example, if the display panel stores the holding voltages of the display luminance levels with the maximum display luminance of 800nit and 500nit at 1Hz and 30 Hz; when the maximum display brightness corresponding to the current display brightness level is 800nit and the current picture refreshing frequency is 10HZ, directly interpolating according to the holding voltage of the display brightness level with the maximum display brightness of 800nit under 1Hz and 30Hz to obtain the holding voltage of the display brightness level with the maximum display brightness of 800nit under 10 Hz; the maximum display brightness corresponding to the current display brightness level is 700nit, when the current picture refreshing frequency is 10HZ, the holding voltages of the display brightness levels with the maximum display brightness of 800nit and 500nit at 10HZ are obtained directly according to the holding voltage interpolation of the display brightness levels with the maximum display brightness of 800nit and 500nit at 1HZ and 30HZ, and then the holding voltage of 700nit is determined according to the holding voltage interpolation of the display brightness levels with the maximum display brightness of 800nit and 500nit at 10 HZ.
The interpolation in the present embodiment may be linear interpolation or nonlinear interpolation.
Optionally, the writing phase includes at least one writing frame; each writing frame comprises a data writing sub-stage and a light emitting sub-stage, and each holding frame comprises a light emitting sub-stage;
before writing the holding voltage to the source of the driving transistor in the holding stage, the method further comprises the following steps:
writing data voltage into the grid electrode of the driving transistor in the data writing sub-stage of each writing frame, and controlling the driving transistor to drive the light-emitting unit to emit light in the light-emitting sub-stage of each writing frame;
the driving method further includes:
and controlling the driving transistor to drive the light emitting unit to emit light in the light emitting sub-phase of each holding frame.
Specifically, each write frame also includes a first initialization sub-phase and a second initialization sub-phase. Referring to fig. 2, in the first initialization sub-stage, the first initialization unit 1014 is turned on, and the first initialization voltage is input to the gate of the driving transistor T2 through the first initialization unit 1014 to initialize the gate of the driving transistor T2. In the second initialization sub-phase, the second initialization unit 1015 may be further controlled to be turned on, and the second initialization voltage is written into the first terminal N1 of the light emitting unit 102 through the second initialization unit 1015, so as to initialize the first terminal of the light emitting unit 102.
In the data writing sub-phase of the writing frame, the data writing unit 1011 and the compensation unit 1012 are turned on, and the data voltage is written into the gate of the driving transistor T2 and the storage capacitor 1013 through the data writing unit 1011 and the compensation unit 1012. In other embodiments, in the data writing sub-phase, the second initializing unit 1015 may be controlled to be turned on, and the second initializing voltage is written into the first terminal N1 of the light emitting unit 102 through the second initializing unit 1015, so as to initialize the first terminal N1 of the light emitting unit 102.
In the light emission sub-stage of the write frame, the first and second light emission control units 1016 and 1017 are turned on, the driving transistor T2 generates a first driving current according to the data voltage, and the light emitting unit 102 emits light in response to the first driving current.
In the data holding phase, the writing of the data voltage is not performed any more, and the data holding phase includes a plurality of holding frames, each of which includes a first initialization sub-phase and a light emission sub-phase. In the first initialization sub-phase, the second initialization unit 1015 is turned on to write a second initialization voltage into the first terminal N1 of the light emitting unit 102. In the light emission sub-stage of the sustain frame, the first and second light emission control units 1016 and 1017 are turned on, the driving transistor T2 generates a second driving current according to the data voltage stored in the storage capacitor 1013, and the light emitting unit 102 emits light in response to the second driving current. The data writing unit 1011 is continuously turned on for the entire frame of each sustain frame, the sustain voltage is written to the source of the driving transistor T2, and the sustain voltage is supplied to the source of the driving transistor T2 for the entire sustain frame.
Optionally, the frame refresh frequency of the display panel is greater than or equal to 1Hz and less than or equal to 120Hz.
Specifically, when the refresh frequency of the display panel is low, the holding period of the display panel is long, so that the data voltage stored in the storage capacitor is attenuated more. The refresh frequency of the display panel is greater than or equal to 1Hz and less than or equal to 120Hz, brightness difference between a writing stage and a maintaining stage caused by data voltage attenuation is easier to occur, different maintaining voltages are adopted by setting different picture refresh frequencies, so that the brightness difference of the display panel in the data maintaining stage and the data writing stage under each refresh frequency is smaller, and the display effect of the display panel is improved.
Fig. 5 is a schematic diagram of a driving apparatus of a display panel according to an embodiment of the present invention, where the display panel includes a plurality of sub-pixels, each of the sub-pixels includes a pixel circuit and a light emitting unit, and the pixel circuit is used for driving the light emitting unit to emit light; the pixel circuit includes a driving transistor; one driving period of the sub-pixel includes a writing phase and a holding phase;
referring to fig. 5, the driving apparatus 300 of the display panel includes:
a frequency determining module 210, configured to determine a current screen refresh frequency of the display panel;
a holding voltage determining module 220, configured to determine a holding voltage of the display panel according to the current frame refresh frequency; wherein, the corresponding holding voltages of different picture refreshing frequencies are different;
and a holding voltage writing module 230 for writing a holding voltage to the source of the driving transistor in the holding phase.
Optionally, the apparatus further comprises:
the display brightness grade determining module is used for determining the current display brightness grade of the display panel before determining the holding voltage of the display panel according to the current picture refreshing frequency, wherein the minimum display brightness corresponding to different display brightness grades is the same, and the maximum display brightness is different;
the holding voltage determining module 230 is further configured to determine a holding voltage according to the current frame refreshing frequency and the current display brightness level; wherein, under the same picture refreshing frequency, the holding voltage of at least part of display brightness grades is different from the holding voltage of other display brightness grades.
Optionally, the hold phase comprises a plurality of hold frames;
the holding voltage writing module 230 is specifically configured to write the holding voltage to the source of the driving transistor in each of the holding frames.
Optionally, the display panel stores at least two different display brightness levels and at least two different frame refresh frequencies of holding voltages;
the holding voltage determining module 230 is specifically configured to:
searching for a holding voltage corresponding to the current display brightness level and the current picture refreshing frequency in the display panel, and if the holding voltage corresponding to the current display brightness level and the current picture refreshing frequency is stored in the display panel, acquiring the holding voltage from the display panel; and if the holding voltage corresponding to the current display brightness grade and the current picture refreshing frequency is not stored in the display panel, determining the holding voltage corresponding to the current display brightness grade and the current picture refreshing frequency according to the holding voltages of at least two different display brightness grades and at least two different picture refreshing frequencies stored in the display panel.
Optionally, the writing phase includes at least one writing frame; each writing frame comprises a data writing sub-stage and a light emitting sub-stage, and each holding frame comprises a light emitting sub-stage;
the device further comprises:
the first writing and light-emitting control module is used for writing a data voltage into the grid electrode of the driving transistor in a data writing sub-stage of each writing frame before writing the holding voltage into the source electrode of the driving transistor in the holding stage, and controlling the driving transistor to drive the light-emitting unit to emit light in a light-emitting sub-stage of each writing frame;
the device further comprises:
and the second light-emitting control module is used for controlling the driving transistor to drive the light-emitting unit to emit light in the light-emitting sub-stage of each holding frame.
Optionally, the picture refresh frequency of the display panel is greater than or equal to 1Hz and less than or equal to 120Hz.
The driving apparatus of the display panel of the embodiment can execute the driving method of the display panel provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.
Fig. 6 is a schematic diagram of a display device according to an embodiment of the present invention, and referring to fig. 6, a display device 100 includes a display panel 200 and a driving device 300 of the display panel according to any embodiment of the present invention. The display device 100 may be, for example, a mobile phone, a tablet, a computer, a display, a smart watch, an MP3, an MP4, a VR, or other wearable devices, and the display device and the driving device of the display panel have similar implementation principles and beneficial effects, and are not described herein again.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired result of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A driving method of a display panel is characterized in that the display panel comprises a plurality of sub-pixels, each sub-pixel comprises a pixel circuit and a light-emitting unit, and the pixel circuit is used for driving the light-emitting unit to emit light; the pixel circuit includes a driving transistor; one drive cycle of the sub-pixel comprises a write phase and a hold phase;
the method comprises the following steps:
determining the current picture refreshing frequency of the display panel;
determining the holding voltage of the display panel according to the current picture refreshing frequency; wherein, the corresponding holding voltages of different picture refreshing frequencies are different;
writing the holding voltage to the source of the drive transistor during the holding phase.
2. The method of claim 1, wherein prior to determining a holding voltage of the display panel based on the current picture refresh frequency, further comprising:
determining the current display brightness level of the display panel, wherein the minimum display brightness corresponding to different display brightness levels is the same, and the maximum display brightness is different;
determining a holding voltage of the display panel according to the current picture refresh frequency comprises:
determining the holding voltage according to the current picture refreshing frequency and the current display brightness level; wherein, under the same picture refreshing frequency, the holding voltage of at least part of display brightness grades is different from the holding voltage of other display brightness grades.
3. The method of claim 2, wherein:
at the same frame refresh frequency: the holding voltages for different display brightness levels are different, or the holding voltages for different ranges of display brightness levels are different.
4. The method of claim 1, wherein the hold phase comprises a plurality of hold frames;
writing the holding voltage to the source of the drive transistor in the holding phase, including:
the holding voltage is written to the source of the drive transistor at each of the holding frames.
5. The method of claim 3, wherein:
the display panel stores at least two holding voltages with different display brightness grades and at least two different picture refreshing frequencies;
determining the holding voltage according to the current picture refresh frequency and the current display brightness level comprises:
searching for a holding voltage corresponding to the current display brightness level and the current picture refreshing frequency in the display panel, and if the holding voltage corresponding to the current display brightness level and the current picture refreshing frequency is stored in the display panel, acquiring the holding voltage from the display panel; and if the holding voltage corresponding to the current display brightness grade and the current picture refreshing frequency is not stored in the display panel, interpolating and determining the holding voltage corresponding to the current display brightness grade and the current picture refreshing frequency according to the holding voltages of at least two different display brightness grades and at least two different picture refreshing frequencies stored in the display panel.
6. The method of claim 5, wherein the writing phase comprises at least one write frame; each writing frame comprises a data writing sub-stage and a light emitting sub-stage, and each holding frame comprises a light emitting sub-stage;
before writing the holding voltage to the source of the driving transistor in the holding phase, the method further includes:
writing a data voltage into the gate of the driving transistor in a data writing sub-stage of each writing frame, and controlling the driving transistor to drive the light-emitting unit to emit light in a light-emitting sub-stage of each writing frame;
the driving method further includes:
and controlling the driving transistor to drive the light-emitting unit to emit light in the light-emitting sub-phase of each holding frame.
7. The method of claim 1, wherein a frame refresh frequency of the display panel is greater than or equal to 1Hz and less than or equal to 120Hz.
8. A driving device of a display panel is characterized in that the display panel comprises a plurality of sub-pixels, each sub-pixel comprises a pixel circuit and a light-emitting unit, and the pixel circuit is used for driving the light-emitting unit to emit light; the pixel circuit includes a driving transistor; one drive cycle of the sub-pixel comprises a write phase and a hold phase;
the driving device includes:
the frequency determining module is used for determining the current picture refreshing frequency of the display panel;
the holding voltage determining module is used for determining the holding voltage of the display panel according to the current picture refreshing frequency; wherein, the corresponding holding voltages of different picture refreshing frequencies are different;
and the holding voltage writing module is used for writing the holding voltage to the source of the driving transistor in the holding stage.
9. The apparatus of claim 8, further comprising:
the display brightness grade determining module is used for determining the current display brightness grade of the display panel before determining the holding voltage of the display panel according to the current picture refreshing frequency, wherein the minimum display brightness corresponding to different display brightness grades is the same, and the maximum display brightness is different;
the holding voltage determining module is further used for determining the holding voltage according to the current picture refreshing frequency and the current display brightness level; wherein, under the same picture refreshing frequency, the holding voltage of at least part of display brightness grades is different from the holding voltage of other display brightness grades.
10. A display device characterized by comprising a display panel and a driving device of the display panel according to any one of claims 8 to 9.
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| CN202211673074.2A CN115798388A (en) | 2022-12-26 | 2022-12-26 | Display panel driving method, driving device and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117037693A (en) * | 2023-08-08 | 2023-11-10 | 苇创微电子(上海)有限公司 | OLED display panel driving method |
| CN117037693B (en) * | 2023-08-08 | 2024-05-17 | 苇创微电子(上海)有限公司 | OLED display panel driving method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117037693A (en) * | 2023-08-08 | 2023-11-10 | 苇创微电子(上海)有限公司 | OLED display panel driving method |
| CN117037693B (en) * | 2023-08-08 | 2024-05-17 | 苇创微电子(上海)有限公司 | OLED display panel driving method |
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