CN107993605B - Display panel driving method and display device - Google Patents
Display panel driving method and display device Download PDFInfo
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Abstract
The embodiment of the invention provides a driving method of a display panel and a display device, relates to the technical field of display, and solves the problem of adverse effect on the display device caused by constant brightness of pixels on the premise of saving power consumption. The driving method of the display panel comprises the following steps: when the display panel is in a target working mode, issuing a target mode control instruction; under the action of a target mode control instruction, providing scanning signals to the grid lines of a target display area in a time-sharing manner in each display time interval, and providing data signals to the data lines of the target display area when each grid line receives the scanning signals; the data signals supplied to the data lines are different in different display periods, and a first data signal corresponding to a first highest gray scale number is supplied to a destination data line in one display period, and a second data signal corresponding to a first lowest gray scale number is supplied to the data line in another display period. The driving method of the display panel is used for driving the target display area to display the target picture.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of display technologies, and in particular, to a driving method of a display panel and a display device.
[ background of the invention ]
When the display device is in a specific working mode, a partial area of the display screen can display the target picture for a long time. As shown in fig. 1, when the display device is in a standby state, in order to allow a user to know clock information in real time without unlocking, digital clock information 1 is generally displayed at a middle area of the display screen. Furthermore, in order to comply with the development trend of the full-screen display, many display devices currently adopt the design of the virtual keys, and when the virtual keys are adopted, in order to enable a user to sense the positions of the keys in real time, icons of the virtual keys need to be displayed in the lower side area of the display screen for a long time. However, when the display device is in the above operation mode, in order to make a part of the area display a picture for a long time, the pixels corresponding to the part of the area need to be kept in a normally bright state, which may cause pixel aging and, in a serious case, may cause screen burn-in.
In order to solve the above problem, in the prior art, a gate scanning unit is usually used to control an area displaying a target picture to move slowly in the whole display screen, so as to prevent the target picture from being displayed in only one area. In this way, although the pixel aging is avoided, if the position of the target picture is to be displayed and the whole display screen is moved, the gate scanning unit supplies scanning signals to the gate lines corresponding to different regions at intervals, which requires the whole gate scanning unit to be in a working state, thereby increasing unnecessary power consumption.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a method for driving a display panel and a display device, which can avoid the problem of adverse effects on the display device caused by the fact that pixels in a target display area are normally bright on the premise of saving power consumption.
In one aspect, an embodiment of the present invention provides a driving method of a display panel, where one luminance variation cycle of the display panel includes a plurality of display periods, the driving method of the display panel including:
when the display panel is in a target working mode, issuing a target mode control instruction;
under the action of the target mode control instruction, according to a target display area which needs to display a target picture, providing scanning signals to grid lines corresponding to the target display area in a time-sharing manner in each display time interval, and providing data signals to data lines corresponding to the target display area when each grid line receives the scanning signals; in different display periods, the data signals provided to the data lines corresponding to the target display area are different, and in one display period, a first data signal corresponding to a first highest gray scale number is provided to the data lines corresponding to the target display area, and in another display period, a second data signal corresponding to a first lowest gray scale number is provided to the data lines corresponding to the target display area;
the first highest gray scale number is a highest gray scale number corresponding to a target picture displayed by the target display area in the brightness change period, and the first lowest gray scale number is a lowest gray scale number corresponding to the target picture displayed by the target display area in the brightness change period.
On the other hand, an embodiment of the present invention further provides a display device, where the display device includes:
the display panel is internally provided with a plurality of grid lines and a plurality of data lines in a crossed and insulated manner;
the mode control unit is used for issuing a target mode control instruction when the display panel is in a target working mode;
the time sequence control unit is respectively connected with the mode control unit and the grid scanning unit; the time sequence control unit is used for displaying a target display area of a target picture according to the requirement under the action of the target mode control instruction, and controlling the grid scanning unit to provide scanning signals to the grid lines corresponding to the target display area in a time-sharing manner in each display time interval;
the data control unit is respectively connected with the mode control unit and the data lines corresponding to the target display area; the data control unit is used for providing data signals to the data lines corresponding to the target display area when each grid line in the target display area receives the scanning signals under the action of the target mode control instruction; in different display periods, the data signals provided to the data lines corresponding to the target display area are different, and in one display period, the first data signal is provided to the data line corresponding to the target display area, and in another display period, the second data signal is provided to the data line corresponding to the target display area;
the first highest gray scale number is a highest gray scale number corresponding to a target picture displayed by the target display area in the brightness change period, and the first lowest gray scale number is a lowest gray scale number corresponding to the target picture displayed by the target display area in the brightness change period.
One of the above technical solutions has the following beneficial effects:
in one brightness change period, different data signals are provided for the data lines corresponding to the target display area in different display periods, so that the brightness of the target picture displayed in the target display area can be controlled to change. And, by providing the first data signal to the data line corresponding to the target display area in one display period and providing the second data signal to the data line corresponding to the target display area in another display period, the brightness of the target picture displayed in the target display area can be changed between the brightest state and the darkest state, and the pixels in the target display area are prevented from being maintained in the normally bright state. In addition, because the technical scheme can avoid that the pixels in the target display area are normally bright, the position of the target display area does not need to be controlled to move any more, and thus when the target image needs to be displayed, the grid scanning unit only needs to scan the grid lines corresponding to the target display area.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a diagram illustrating a display target screen when a display device is in a standby mode according to the prior art;
FIG. 2 is a flow chart of a driving method of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a pixel driving circuit according to an embodiment of the present invention;
FIG. 4 is a timing diagram of gate lines and data lines corresponding to a target display area according to an embodiment of the present invention;
fig. 5 is a signal timing diagram of gate lines and data lines corresponding to a target display area when a display screen is woken up according to an embodiment of the present invention;
FIG. 6 is a first schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 7 is a first timing diagram of gate line signals when the display panel of the embodiment of the invention is in a normal operating mode;
FIG. 8 is a first timing diagram of gate line signals when the display panel is in the target operation mode according to the embodiment of the invention;
FIG. 9 is a schematic diagram of a gate scan circuit according to an embodiment of the present invention;
FIG. 10 is a second timing diagram of gate line signals when the display panel of the embodiment of the invention is in the normal operating mode;
FIG. 11 is a second timing diagram of gate line signals when the display panel is in the target operation mode according to the embodiment of the invention;
FIG. 12 is a second schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram three of a display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first and second may be used to describe data signals in embodiments of the present invention, the data lines should not be limited to these terms. These terms are only used to distinguish the data lines from each other. For example, the first data signal may also be referred to as the second data signal, and similarly, the second data signal may also be referred to as the first data signal, without departing from the scope of embodiments of the present invention.
An embodiment of the present invention provides a driving method of a display panel, wherein one luminance variation cycle of the display panel includes a plurality of display periods. As shown in fig. 2, the driving method of the display panel includes:
step S1: and when the display panel is in the target working mode, issuing a target mode control instruction.
The target working mode may be a standby mode, a charging mode, a virtual key start mode or other types of working modes, and the specific type of the target working mode may be specifically defined according to the actual application condition of the display device.
Step S2: under the action of the target mode control instruction, a target display area of a target picture is displayed according to the requirement, and a scanning signal is provided to the grid line corresponding to the target display area in a time sharing mode in each display time interval.
The target display area is an area in the display area for displaying the target screen when the display device is in the target operation mode. Taking fig. 1 as an example, when the display device is in the standby mode, the target display area refers to the middle area for displaying the digital clock information 1.
Step S3: when each grid line receives a scanning signal, a data signal is provided for the data line corresponding to the target display area. In different display periods, the data signals provided for the data lines are different, and in one display period, a first data signal corresponding to the first highest gray scale number is provided for the data line corresponding to the target display area, and in another display period, a second data signal corresponding to the first lowest gray scale number is provided for the data line corresponding to the target display area.
The first highest gray scale number refers to a highest gray scale number corresponding to a target picture displayed in the target display area in the brightness change period, and the first lowest gray scale number refers to a lowest gray scale number corresponding to the target picture displayed in the target display area in the brightness change period.
It is understood that the gray scale refers to the gradation level of the image with different brightness between the brightest state and the darkest state, that is, when the first data signal corresponding to the first highest gray scale number is provided to the data line corresponding to the target display area, the display image of the target display area presents the brightest state in the brightness change period, and when the second data signal corresponding to the first lowest gray scale number is provided to the data line corresponding to the target display area, the display image of the target display area presents the darkest state in the brightness change period.
By adopting the driving method of the display panel provided by the embodiment, in one brightness change period, different data signals are provided to the data lines corresponding to the target display area in different display periods, so that the brightness of the target picture displayed by the target display area can be controlled to change. And, by providing the first data signal to the data line corresponding to the target display area in one display period and providing the second data signal to the data line corresponding to the target display area in another display period, the brightness of the target picture displayed in the target display area can be changed between the brightest state and the darkest state, and the pixels in the target display area are prevented from being maintained in the normally bright state. In addition, due to the fact that the driving method can avoid that the pixels in the target display area are normally bright, the position of the target display area does not need to be controlled to move, and therefore when the target picture needs to be displayed, the grid scanning unit only needs to scan the grid lines corresponding to the target display area.
Therefore, compared with the prior art, the driving method of the display panel provided by the embodiment can avoid that the pixels in the target display area are maintained in a normally-on state on the premise of reducing power consumption, slow down the aging of the pixels to a great extent, and further avoid generating adverse effects on the display device.
Of course, it is understood that the target display area may include only a complete area or a plurality of dispersed areas according to the picture distribution of the target picture to be displayed. The target display area may be any position in the display area, and is specifically set according to a position of a target screen to be displayed.
For an Organic Light-Emitting Diode (OLED) display panel, taking the pixel driving circuit shown in fig. 3 as an example, the pixel driving circuit includes a switching tube T1, a driving tube T2, a capacitor Cst, and an Organic Light-Emitting Diode D1.
When the organic light emitting diode D1 is driven to emit light, the calculation formula of the current flowing into the organic light emitting diode D1 is as shown in formula (1):
where I denotes a current flowing in the organic light emitting diode D1, μnDenotes the migration rate of electrons, CoxThe capacitance of the gate oxide layer per unit area is expressed,
denotes the channel width-to-length ratio, VgsRepresenting the gate-source voltage, V, of the drive transistor T2thRepresenting the threshold voltage of the drive tube T2.
According to Vgs＝PVDD-VdataIt can be deduced that:
wherein PVDD represents a power supply voltage, VdataRepresenting the data signals transmitted by the data lines.
Eliminating the threshold voltage V of the driving tube T2thBased on equation (2), one can deduce:
as can be seen from the formula (3), when other parameters are constant, the current I flowing into the organic light emitting diode D1 and the data signal V transmitted through the data linedataIn inverse proportion. That is, the data signal V transmitted by the data linedataThe larger the current I flowing into the organic light emitting diode D1, the darker the brightness of the target picture displayed by the target display area; data signal V transmitted by data linedataThe smaller the current I flowing into the organic light emitting diode D1, the brighter the target picture displayed by the target display region.
It should be noted that the connection relationship between the structures in the pixel driving circuit shown in fig. 3 and the operation principle of the pixel driving circuit are the same as those of the conventional "2T 1C", and the description of this embodiment is omitted.
Illustratively, one luminance change cycle includes 2M display periods, where M is a positive integer greater than or equal to 1. And in the 1 st display period to the Nth display period, the magnitude of the data signal provided to the data line corresponding to the target display area is gradually reduced, wherein N is less than 2M. The magnitude of the data signal supplied to the data line of the target display region gradually increases in the N +1 th to 2M th display periods. That is, in one brightness change period, the brightness of the target picture changes from dark to light and then from light to dark.
Assuming that the target display area corresponds to the a-th row Gate line Gate a to the b-th row Gate line Gate b and corresponds to the m-th column Data line Data m to the n-th column Data line Data n, each display period includes f sub-periods, and f is b-a + 1; the following describes the above driving method in detail with reference to the signal timing chart shown in fig. 4:
first, for convenience of presentation, the Data signals supplied to the m-th to n-th column Data lines Data m to Data n are collectively presented with one pulse every one subinterval.
First sub-period t in the 1 st display period1A scanning signal is provided to the Gate line Gate a of the a-th row, and a signal of V is provided to the data lines (not shown) of the m-th to n-th columns1The data signal of (1); second sub-period t in the 1 st display period2A scanning signal is provided to the Gate line Gate (a +1) of the (a +1) th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columns1The data signal of (1); … …, respectively; the f-th sub period t in the 1 st display periodfA scanning signal is provided to the Gate line Gate b of the b-th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columns1The data signal of (1).
First sub-period t in the 2 nd display period1A scanning signal is provided to the Gate line Gate a of the a-th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columns2The data signal of (1); second sub-period t in the 2 nd display period2A scanning signal is provided to the Gate line Gate (a +1) of the (a +1) th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columns2The data signal of (1); … …, respectively; the f sub-period t in the 2 nd display periodfA scanning signal is provided to the Gate line Gate b of the b-th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columns2The data signal of (1); wherein, V2＜V1。
And so on, in the first sub-period t of the Nth display period1A scanning signal is provided to the Gate line Gate a of the a-th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columnsNThe data signal of (1); second sub-period t in Nth display period2A scanning signal is provided to the Gate line Gate (a +1) of the (a +1) th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columnsNThe data signal of (1); … …, respectively; f sub-period t in N display periodfA scanning signal is provided to the Gate line Gate b of the b-th row, and a signal is provided to the data lines of the m-th to n-th columnsIs as small as VNThe data signal of (1); wherein, VN＜VN-1，VN-1And providing data signals to the mth column to the nth column data lines in the (N-1) th display period.
First sub-period t in the N +1 th display period1A scanning signal is provided to the Gate line Gate a of the a-th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columnsN+1The data signal of (1); second sub-period t in the N +1 th display period2A scanning signal is provided to the Gate line Gate (a +1) of the (a +1) th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columnsN+1The data signal of (1); … …, respectively; the f sub-period t at the N +1 th display periodfA scanning signal is provided to the Gate line Gate b of the b-th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columnsN+1The data signal of (1); wherein, VN+1＞VN。
And so on, in the first sub-period t of the 2M display period1A scanning signal is provided to the Gate line Gate a of the a-th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columns2MThe data signal of (1); during a second sub-period t of 2M display periods2A scanning signal is provided to the Gate line Gate (a +1) of the (a +1) th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columns2MThe data signal of (1); … …, respectively; the f sub-period t in the 2M display periodfA scanning signal is provided to the Gate line Gate b of the b-th row, and simultaneously, a signal with a magnitude of V is provided to the data lines of the m-th to n-th columns2MThe data signal of (1); wherein, V2M＞V2M-1，V2M-1And data signals supplied to the mth column to nth column data lines for the 2M-1 th display period.
Optionally, in the 1 st display period, the second data signal corresponding to the first lowest gray scale number, that is, the size V, may be provided to the data line corresponding to the target display area1The data signal of (2) is a second data signal, and at the moment, the target picture displayed in the target display area is in the darkest state; in the Nth display period, the data line corresponding to the target display area is provided with the data line corresponding to the first highest gray scale numberA data signal, i.e. of magnitude VNThe data signal of (2) is a first data signal, and at the moment, the target picture displayed in the target display area is in the brightest state; in the 2M display period, a second data signal corresponding to the first lowest gray scale number, i.e. V, is provided to the data line corresponding to the target display region2M＝V1At this time, the target screen displayed in the target display area is in the darkest state.
By the control mode, in a brightness change period, the target picture displayed in the target display area is in the darkest state at first, then the brightness is gradually increased, and when the target picture is in the brightest state, the brightness is gradually reduced until the brightness is reduced to the darkest state. Taking the example of the display device shown in fig. 1 displaying the digital clock information 1 during standby, when the display device is in the standby mode, the display screen will be in the darkest state, if the digital clock information 1 is initially in the high brightness state, in the standby state, the digital clock information 1 suddenly displaying the high brightness will give a strong stimulation to the eyes of people. By adopting the mode, when the digital clock information 1 is displayed at the beginning, the picture displaying the digital clock information 1 is darker, so that an adaptation process can be provided for human eyes, and the stimulation brought to the human eyes by high brightness is avoided.
In addition to the above-described variation, the brightness of the target picture may be changed in another brightness variation manner within one brightness variation period.
Specifically, when the luminance change period includes 2M display periods, the magnitude of the data signal supplied to the data line corresponding to the target display region gradually increases in the 1 st to nth display periods, that is, the luminance of the target picture changes from bright to dark in the 1 st to nth display periods, where N < 2M. In the (N +1) th to (2) M-th display periods, the magnitude of the data signal supplied to the data line of the target display region is gradually decreased, that is, the luminance of the target picture is changed from dark to light in the (N +1) th to (2) M-th display periods.
The driving method of the brightness variation mode is similar to the driving method of the variation mode from dark to light and then from light to dark, and the difference is only that the level state of the data signal provided to the data line in each display period is opposite, and the description is omitted here.
When the brightness of the target frame changes from bright to dark and then from dark to bright, optionally, in the 1 st display period, the first data signal corresponding to the first highest gray scale number, that is, the first data signal with the size of V, may be provided to the data line corresponding to the target display areaNThe data signal of (2) is a first data signal, and at the moment, the target picture displayed in the target display area is in the brightest state; in the Nth display period, a second data signal corresponding to the first lowest gray scale number is provided to the data line corresponding to the target display area, namely the data line has the size of V1The data signal of (2) is a second data signal, and at the moment, the target picture displayed in the target display area is in the darkest state; in the 2M display period, a first data signal corresponding to the first highest gray scale number is provided to the data line corresponding to the target display area, namely the data line has the size of VNThe data signal of (2) is a first data signal, and at this time, the target picture displayed in the target display area is in the brightest state.
By the control mode, the brightness of the target picture displayed in the target display area can be changed between the brightest state and the darkest state, so that the pixels in the target display area are prevented from being maintained in the normally bright state.
In addition, it should be noted that, in one brightness change period, the brightness of the target picture can be changed in any other manner besides the above change manner, and it only needs to satisfy that in one display period, the first data signal is provided to the data line corresponding to the target display area, and in another display period, the second data signal is provided to the data line corresponding to the target display area, which is not limited in this embodiment.
Alternatively, for the two luminance variation modes, N may be equal to M, and the difference between the data signals supplied to the data lines corresponding to the target display region in any two adjacent display periods may be equal. In this way, the number of times of brightness change of the target picture from the darkest state to the brightest state is the same as the number of times of brightness change of the target picture from the brightest state to the darkest state, and the brightness change degrees of the target pictures in two adjacent display periods are the same, so that the target picture can present softer brightness change, and can be better accepted by human eyes.
In addition, because the target display area is only used for displaying the target picture similar to the prompt message, the brightness requirement of the picture displayed when the target picture is not normally displayed is high, therefore, when the first highest gray scale number of the target display area is set, the first highest gray scale number of the target display area can be smaller than the second highest gray scale number set for the display panel, so that the highest brightness of the target picture does not need to reach the highest brightness reached when the display panel normally displays the picture, and the power consumption is saved to a certain extent.
For example, when the second highest gradation number set to the display panel is 255, the first highest gradation number may be set to 64 or 128. When the first highest gray scale number is set to 64, the brightness of the target picture is in a softer state, and the power consumption is reduced on the premise that the target picture is displayed in the brightness visible to human eyes.
And, as for the first lowest gradation number of the target display area, it may be made equal to the second lowest gradation number set for the display panel. Generally, the second lowest gray scale number set for the display panel and the first lowest gray scale number set for the target display area are usually 0. When the first lowest gradation number of the target display area is 0, the luminance of the target picture can be made darkest, thereby further reducing power consumption.
In addition, for the conventional display device, when the target display area displays the target image with higher brightness for a long time, if the display screen needs to be awakened, that is, the image needs to be switched, the target image usually stays in the switching process, and the target image can be automatically faded after a while, that is, the afterimage is generated. Taking the display device shown in fig. 1 as an example again, when the display device is in a standby mode, the middle area of the display screen will display the data clock information 1, and when the display screen suddenly pops up the telephone call screen, the digital clock information 1 will have a ghost phenomenon in the fading process.
In view of the above problem, the driving method of the display panel provided in this embodiment is further described in two ways:
in a first mode
In a brightness change period of the display panel, when a display screen awakening instruction is detected, a second data signal corresponding to the first lowest gray scale number can be provided for the data line corresponding to the target display area, and meanwhile, the display screen is awakened.
Specifically, as shown in fig. 5, in the brightness variation period, when the display screen wake-up command is detected, the wake-up signal WK is output, and the second data signal Vst is input to the data line corresponding to the target display area. When a display screen wake-up instruction is detected, the brightness of a target picture displayed in the target display area can be changed to the darkest state by providing the second data signal Vst to the data line corresponding to the target display area, so that the target picture cannot generate ghost in the picture switching process when the display screen is woken up, namely, picture switching is carried out.
Mode two
And in one brightness change period, when a display screen awakening instruction is detected, awakening the display screen after the data line corresponding to the target display area receives the second data signal.
Because the data line corresponding to the target display area receives the second data signal corresponding to the first lowest gray scale number in a brightness change period, when a display screen awakening instruction is detected, the display screen can be awakened after the data line receives the second data signal and the brightness of the target picture is changed to the darkest state, so that the generation of residual shadows of the target picture in the picture switching process can be avoided, the original brightness change of the target picture is kept, the target picture is naturally transited to the darkest state, and human eyes can be more adaptive.
It is to be understood that one display period as described above may include one frame time or may include multiple frame times as long as the same data signal is supplied to the data lines corresponding to the target display region in the same display period.
As shown in fig. 6, an embodiment of the present invention also provides a display device including a display panel 2, a gate scanning unit 3, a mode control unit 4, a timing control unit 5, and a data control unit 6.
The display panel 2 is provided with a plurality of Gate lines Gate and a plurality of Data lines Data in a crossed and insulated manner. The Gate scanning unit 3 is connected to the plurality of Gate lines Gate, and the Gate scanning unit 3 is configured to provide a scanning signal to the Gate lines Gate in a time-sharing manner. The mode control unit 4 is configured to issue a target mode control instruction when the display panel 2 is in the target operating mode.
The target working mode may be a standby mode, a charging mode, a virtual key start mode or other types of working modes, and the specific type of the target working mode may be specifically defined according to the actual application condition of the display device.
The time sequence control unit 5 is respectively connected with the mode control unit 4 and the gate scanning unit 3, and the time sequence control unit 5 is configured to display a target display area of a target picture as needed when receiving a target mode control instruction, and control the gate scanning unit 3 to provide a scanning signal to a gate line corresponding to the target display area in a time division manner in each display period.
The data control unit 6 is respectively connected with the mode control unit 4 and the data lines corresponding to the target display area, and the data control unit 6 is used for providing data signals to the data lines corresponding to the target display area when receiving a target mode control instruction and each grid line in the target display area receives a scanning signal; in different display periods, the data signals provided to the data lines corresponding to the target display area are different, and in one display period, the first data signal is provided to the data line corresponding to the target display area, and in another display period, the second data signal is provided to the data line corresponding to the target display area.
The first highest gray scale number is a highest gray scale number corresponding to a target picture displayed by the target display area in the brightness change period, and the first lowest gray scale number is a lowest gray scale number corresponding to the target picture displayed by the target display area in the brightness change period.
By adopting the display device provided by the embodiment, through the mutual cooperation of the gate scanning unit 3, the mode control unit 4, the time sequence control unit 5 and the data control unit 6, in a brightness change period, the brightness of a target picture displayed in a target display area can be changed between the brightest state and the darkest state, so that the condition that pixels in the target display area maintain a normally bright state is avoided, the aging of the pixels is slowed down to a great extent, and further, the adverse effect on the display device is avoided. In addition, in order to display the target picture in the target display area, the gate scanning unit 3 only needs to scan the gate lines corresponding to the target display area, and compared with a mode of controlling the target display area to move in the prior art, power consumption in the driving process can be reduced.
Assuming that q rows of Gate lines Gate 1-Gate q and p columns of Data lines Data 1-Data p are arranged in the display panel 2, the target display area corresponds to the a-th row to b-th row of Gate lines in the q rows of Gate lines and corresponds to the m-th column to n-th column of Data lines in the p columns of Data lines, the following description will be made in detail on the working principle of the Gate scanning unit 3, the mode control unit 4, the timing control unit 5 and the Data control unit 6 in combination with the driving process of the display panel 2:
first, in this embodiment, since the position of the target display area does not need to be moved, that is, the target display area is a fixed position in the display area, the position of the target display area, that is, the number of rows of the gate lines corresponding to the target display area needs to be preset before the display panel is applied. For example, when the display panel is in the target operation mode, if it is necessary to drive the regions corresponding to the gate lines in the 1 st to 100 th rows for display, it is necessary to make a equal to 1 and b equal to 100. Alternatively, when the display panel is in the target operation mode, if it is only necessary to drive the regions corresponding to the gate lines in the 110 th to 120 th rows for display, then it is necessary to set a to 110 and b to 120. Of course, the values of a and b are specifically set according to actual conditions, and this embodiment is not particularly limited thereto.
When the display panel 2 is in the normal operation mode, when the whole display area displays a picture, the mode control unit 4 issues a normal mode control instruction to the Gate scanning unit 3 and the Data control unit 6, under the action of the normal mode control instruction, the Gate scanning unit 3 provides scanning signals to the Gate lines Gate1 of the 1 st row and the Gate lines Gate q of the q th row in a time-sharing manner, and when each Gate line receives the scanning signals, the Data control unit 6 provides corresponding Data signals to the Data lines Data1 of the 1 st column and the Data lines Data p of the p th column, so as to control the whole display area to display the picture. Fig. 7 shows a timing chart of scanning signals corresponding to the Gate lines Gate1 in the 1 st row to Gate lines Gate q in the q th row when the display panel 2 is in the normal operation mode.
When the display panel 2 is in a target operating mode, for example, a standby mode, the mode control unit 4 issues a target mode control instruction to the Gate scanning unit 3 and the Data control unit 6, under the action of the target mode control instruction, the timing control unit 5 controls the Gate scanning unit 3 to provide scanning signals to the Gate lines Gate a to Gate b in row a in a time-sharing manner, and when each Gate line receives the scanning signal, the Data control unit 6 provides corresponding Data signals to the Data lines Data m to Data lines Data n in column n in m to control the target display area to display. The working processes of providing the scanning signals to the a-th row Gate line Gate a to the b-th row Gate line Gate b and providing the Data signals to the m-th column Data line Data m to the n-th column Data line Data n have been described in detail in the driving method of the display panel, and are not described again here. Fig. 8 shows a timing chart of scanning signals corresponding to the Gate lines Gate1 in the 1 st row to Gate lines Gate q in the q th row in one display period when the display panel 2 is in the target operation mode.
Specifically, as shown in fig. 9, the Gate scanning unit 3 includes q cascaded shift registers VSR1 to VSRq, and the q cascaded shift registers are respectively connected to the Gate lines Gate1 of the 1 st row and the Gate lines Gate q of the q th row in a one-to-one correspondence. Each shift register comprises a first clock signal end CK1, a second clock signal end CK2 and a Reset end Reset, a previous output end OUT IN two adjacent shift registers is connected with a shift control end IN of a next shift register, IN addition, the 1 st-stage shift register VSR1 further comprises a first trigger signal end STV1, the a-th-stage shift register VSRa comprises a second trigger signal end STV2, and the first trigger signal end STV1 and the second trigger signal end STV2 are respectively connected with the timing control unit 5.
As shown in fig. 10, when the timing control unit 5 receives the normal mode control command, the timing control unit 5 issues a first trigger signal to the first trigger signal terminal STV1 of the shift register VSR1 of level 1 to control the first shift register VSR1 to operate, and then provides the scan signals to the Gate lines Gate1 of row 1 to Gate lines Gate q of row q in a time-sharing manner. As shown in fig. 11, when the timing control unit 5 receives the target mode control instruction, in a display period, the timing control unit 5 issues a second trigger signal to the second trigger signal terminal STV2 of the a-th shift register VSRa, controls the a-th shift register VSRa to operate, and then provides the scan signals to the a-th to b-th row Gate lines Gate a to Gate b in a time-sharing manner.
Please refer to fig. 11 again, in order to trigger the a-th to b-th shift registers VSRa to VSRb to sequentially output the scan signals when the display panel 2 is in the target operation mode, after the b-th shift register VSRb outputs the scan signals, the Reset signal may be output to the Reset terminal Reset of the shift register, so as to prevent the b + 1-th to q-th shift registers VSRb +1 to VSRq from continuously outputting the scan signals.
In addition, when the display panel 2 is in the target operation mode, and the display screen is wakened by adopting the driving method provided in the first manner, correspondingly, as shown in fig. 12, the display device further includes a first wake-up instruction detecting unit 7 and a first wake-up control unit 8.
The first wake-up instruction detection unit 7 is configured to detect a display screen wake-up instruction. The data control unit 6 is connected to the first wake-up instruction detection unit 7, and the data control unit 6 is further configured to provide a second data signal to the data line corresponding to the target display area when the first wake-up instruction detection unit 7 detects a display screen wake-up instruction. The first wake-up control unit 8 is connected to the first wake-up instruction detection unit 7, and the first wake-up control unit 8 is configured to wake up the display screen when the first wake-up instruction detection unit 7 detects a display screen wake-up instruction.
When the first wake-up instruction detection unit 7 detects a display screen wake-up instruction, the data control unit 6 provides a second data signal to the data line corresponding to the target display area, so that the brightness of the target image displayed in the target display area is changed to the darkest state, and thus, when the first wake-up control unit 8 wakes up the display screen, the target image does not generate a ghost in the image switching process.
When the display screen is wakened by using the driving method provided in the above-mentioned manner two, as shown in fig. 13, the display device further includes a second wake-up instruction detecting unit 9 and a second wake-up control unit 10.
The second wake-up instruction detecting unit 9 is configured to detect a display screen wake-up instruction. The second wake-up control unit 10 is connected to the second wake-up instruction detection unit 9 and the data control unit 6, respectively, and the second wake-up control unit 10 is configured to determine whether the data control unit 6 provides the second data signal to the data line corresponding to the target display area after the first wake-up instruction detection unit 7 detects the display screen wake-up instruction, and wake up the display screen when it is determined that the data control unit 6 provides the second data signal to the data line.
In a brightness change period, the data control unit 6 provides the data line corresponding to the target display area with the second data signal corresponding to the first lowest gray scale number, so that when a display screen wake-up instruction is detected, the data line can wait until the data line receives the second data signal, and wake up the display screen after the brightness of the target picture is changed to the darkest state, so that the target picture can be prevented from generating ghost images in the picture switching process, the target picture can keep the original brightness change and naturally transit to the darkest state, and human eyes can be more adaptive.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (11)
1. A driving method of a display panel, wherein one luminance change cycle of the display panel includes a plurality of display periods, the driving method of the display panel comprising:
when the display panel is in a target working mode, issuing a target mode control instruction;
under the action of the target mode control instruction, according to a target display area which needs to display a target picture, providing scanning signals to grid lines corresponding to the target display area in a time-sharing manner in each display time interval, and providing data signals to data lines corresponding to the target display area when each grid line receives the scanning signals; in different display periods, the data signals provided to the data lines corresponding to the target display area are different, and in one display period, a first data signal corresponding to a first highest gray scale number is provided to the data lines corresponding to the target display area, and in another display period, a second data signal corresponding to a first lowest gray scale number is provided to the data lines corresponding to the target display area;
the first highest gray scale number is a highest gray scale number corresponding to a target picture displayed by the target display area in the brightness change period, and the first lowest gray scale number is a lowest gray scale number corresponding to the target picture displayed by the target display area in the brightness change period; the brightness variation cycle includes 2M of the display periods, M being a positive integer greater than or equal to 1;
in the 1 st to Nth display periods, the magnitude of the data signals provided to the data lines corresponding to the target display area is gradually reduced, wherein N is less than 2M; in the (N +1) th to (2M) th display periods, the magnitude of the data signal supplied to the data line of the target display area is gradually increased;
or, in the 1 st to nth display periods, the magnitude of the data signal provided to the data line corresponding to the target display region gradually increases; in the (N +1) th to (2M) th display periods, the magnitude of the data signal provided to the data line of the target display area is gradually reduced;
wherein N is greater than or equal to 3.
2. The method for driving a display panel according to claim 1,
providing the second data signal to the data line corresponding to the target display area in the 1 st display period, providing the first data signal to the data line corresponding to the target display area in the Nth display period, and providing the second data signal to the data line corresponding to the target display area in the 2 Mth display period;
or, in the 1 st display period, the first data signal is provided to the data line corresponding to the target display area, in the nth display period, the second data signal is provided to the data line corresponding to the target display area, and in the 2M display period, the first data signal is provided to the data line corresponding to the target display area.
3. The method of driving a display panel according to claim 1, wherein N ═ M; and in any two adjacent display periods, the difference value of the data signals supplied to the data lines corresponding to the target display area is equal.
4. The method according to claim 1, wherein a first highest number of gradations of the target display region is smaller than a second highest number of gradations set for the display panel, and the first lowest number of gradations of the target display region is equal to the second lowest number of gradations set for the display panel.
5. The method according to claim 4, wherein the second highest gradation number set for the display panel is 255 and the second lowest gradation number is 0; the first highest gray scale number of the target display area is 64, and the first lowest gray scale number of the target display area is 0.
6. The method for driving a display panel according to claim 1, further comprising: and in one brightness change period, when a display screen awakening instruction is detected, providing the second data signal for the data line corresponding to the target display area, and awakening the display screen.
7. The method for driving a display panel according to claim 1, further comprising: and in one brightness change period, when a display screen awakening instruction is detected, awakening the display screen after the data line corresponding to the target display area receives the second data signal.
8. The method according to claim 1, wherein one of the display periods includes a K frame time, K being a positive integer greater than or equal to 1.
9. A display device, characterized in that the display device comprises:
the display panel is internally provided with a plurality of grid lines and a plurality of data lines in a crossed and insulated manner; one luminance change cycle of the display panel includes a plurality of display periods,
the mode control unit is used for issuing a target mode control instruction when the display panel is in a target working mode;
the time sequence control unit is respectively connected with the mode control unit and the grid scanning unit; the time sequence control unit is used for displaying a target display area of a target picture according to the requirement under the action of the target mode control instruction, and controlling the grid scanning unit to provide scanning signals to the grid lines corresponding to the target display area in a time-sharing manner in each display time interval;
the data control unit is respectively connected with the mode control unit and the data lines corresponding to the target display area; the data control unit is used for providing data signals to the data lines corresponding to the target display area when each grid line in the target display area receives the scanning signals under the action of the target mode control instruction; in different display periods, the data signals provided to the data lines corresponding to the target display area are different, and in one display period, a first data signal corresponding to a first highest gray scale number is provided to the data lines corresponding to the target display area, and in another display period, a second data signal corresponding to a first lowest gray scale number is provided to the data lines corresponding to the target display area;
the first highest gray scale number is a highest gray scale number corresponding to a target picture displayed by the target display area in the brightness change period, and the first lowest gray scale number is a lowest gray scale number corresponding to the target picture displayed by the target display area in the brightness change period;
wherein the luminance change cycle includes 2M of the display periods, M being a positive integer greater than or equal to 1;
in the 1 st to Nth display periods, the magnitude of the data signals provided to the data lines corresponding to the target display area is gradually reduced, wherein N is less than 2M; in the (N +1) th to (2M) th display periods, the magnitude of the data signal supplied to the data line of the target display area is gradually increased;
or, in the 1 st to nth display periods, the magnitude of the data signal provided to the data line corresponding to the target display region gradually increases; in the (N +1) th to (2M) th display periods, the magnitude of the data signal supplied to the data line of the target display region is gradually decreased.
10. The display device according to claim 9, wherein the display device further comprises a first wake-up instruction detecting unit and a first wake-up controlling unit;
the first awakening instruction detection unit is used for detecting an awakening instruction of the display screen;
the data control unit is connected with the first awakening instruction detection unit and is further used for providing the second data signal for the data line corresponding to the target display area when the first awakening instruction detection unit detects the display screen awakening instruction;
the first awakening control unit is connected with the first awakening instruction detection unit and used for awakening the display screen when the first awakening instruction detection unit detects the display screen awakening instruction.
11. The display device according to claim 9, wherein the display device further comprises a second wake-up instruction detecting unit and a second wake-up controlling unit;
the second awakening instruction detection unit is used for detecting an awakening instruction of the display screen;
the second awakening control unit is respectively connected with the second awakening instruction detection unit and the data control unit, and is used for judging whether the data control unit provides the second data signal for the data line corresponding to the target display area after the second awakening instruction detection unit detects the display screen awakening instruction, and awakening the display screen after judging that the data control unit provides the second data signal for the data line.
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