CN104992690A - Display panel and driving method thereof and display device - Google Patents
Display panel and driving method thereof and display device Download PDFInfo
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- CN104992690A CN104992690A CN201510484955.3A CN201510484955A CN104992690A CN 104992690 A CN104992690 A CN 104992690A CN 201510484955 A CN201510484955 A CN 201510484955A CN 104992690 A CN104992690 A CN 104992690A
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Abstract
The invention provides a display panel and a driving method thereof and a display device, belongs to the technical field of display and can solve the problem of screen flickering due to electric leakage of pixel units in the displaying process of an existing display panel. According to the driving method of the display panel, the display panel comprises a plurality of gate lines and a plurality of data lines which are in multiple-cross arrangement, and pixel units are defined in the cross positions of the gate lines and the data lines. The driving method comprises the following steps: a data voltage writing-in stage: inputting a gate start voltage to the gate lines and writing a data voltage into the pixel units controlled by the gate lines input with the gate start voltage through the data lines; and a data voltage maintenance stage: inputting a gate cut-off voltage to the gate lines and adjusting the magnitude of the gate cut-off voltage to enable the data voltage in the pixel units to keep constant. The effect of a frame displayed by using the driving method above is excellent.
Description
Technical field
The invention belongs to display technique field, be specifically related to a kind of driving method of display panel, display panel and display device.
Background technology
Liquid crystal display (LCD; Liquid Crystal Display) main product in current flat panel display product is become because of features such as its volume are little, low in energy consumption, radiationless.
Along with the develop rapidly of lcd technology, the liquid crystal display product of low-power consumption is more and more subject to the favor of people.At present, in order to realize the low-power consumption display showing product, the frame rate (i.e. the frequency of a frame scan) of liquid crystal display product display to usually be reduced.Same liquid crystal display frame rate for the waveform of data voltage that pixel cell each during 60Hz and 30Hz writes as depicted in figs. 1 and 2, as can be seen from Fig. 1 and Fig. 2, all can leaky be there is in pixel cell in every frame scan process, and due to the twice of to be frame rate be the frame rate of display scan period (scanning the time that a frame picture is used) that is 30Hz scan period of 60Hz, the twice of when therefore frame rate is 30Hz, the electrical leakage quantity of pixel cell is approximately frame rate when the being 60Hz electrical leakage quantity of pixel, namely frame rate is lower, the electrical leakage quantity of pixel is larger.
Inventor finds that in prior art, at least there are the following problems: the electric leakage of pixel cell will directly cause the insufficient of liquid crystal deflection, thus causes liquid crystal display to produce film flicker when showing, and then affects the image display quality of display.
Summary of the invention
Technical matters to be solved by this invention comprises, there are the problems referred to above for existing display panel when showing, providing a kind of can effectively avoiding to leak electricity the driving method of display panel of the display frame flicker problem caused, display panel and display device due to pixel cell.
The technical scheme that solution the technology of the present invention problem adopts is a kind of driving method of display panel, described display panel comprises many grid lines how arranged in a crossed manner and a plurality of data lines, and limit pixel cell at the crossover location of grid line and data line, described driving method comprises:
Data voltage write phase: pass into gate turn-on voltage to grid line, and by data line give by pass through into gate turn-on voltage grid line control pixel cell write data voltage;
Data voltage keeps the stage: pass into grid cut-off voltage to grid line, and adjust the size of described grid cut-off voltage, keeps constant to make the data voltage in described pixel cell.
Preferably, the rate of change of the data voltage write in pixel cell described in the data voltage maintenance stage and the rate of change of grid cut-off voltage are inversely proportional to.Rate of change
Further preferably, the amplitude of variation △ V of described grid cut-off voltage
glmeet with the data voltage △ V compensated in described pixel cell: △ V
gl* C
gs/ (C
gs+ C
pixel); Wherein, C
gsfor the capacitance of grid source electric capacity, C
pixelfor the capacitance of pixel capacitance.
Preferably, when showing each frame picture, the polarity of the data voltage write for pixel cell in two adjacent lines is contrary, and be same pixel cell when two consecutive frame pictures show, the polarity of the data voltage of write is contrary.
Preferably, when showing each frame picture, in the row direction with on column direction, the polarity of the data voltage that two adjacent pixel unit write is contrary, and be same pixel cell when two consecutive frame pictures show, the polarity of the data voltage of write is contrary.
The technical scheme that solution the technology of the present invention problem adopts is a kind of display panel, and comprise many grid lines how arranged in a crossed manner and a plurality of data lines, and limit pixel cell at the crossover location of grid line and data line, described display panel also comprises:
Data write unit, for for by described data line be described pixel cell write data voltage;
Grid voltage output unit, in data write phase for grid line provides grid to open unit, keep the stage to provide grid cut-off voltage for grid line at data voltage;
Voltage-adjusting unit, for adjusting the size of described grid cut-off voltage, keeps constant to make the data voltage in described pixel cell.
Preferably, described voltage-adjusting unit specifically for, adjust the size of described grid cut-off voltage, be inversely proportional to the rate of change of the slope and grid cut-off voltage that make the rate of change of the data voltage of the data voltage write in pixel cell described in the data voltage maintenance stage.
Further preferably, the amplitude of variation △ V of described grid cut-off voltage
glmeet with the data voltage △ V compensated in described pixel cell: △ V
gl* C
gs/ (C
gs+ C
pixel); Wherein, C
gsfor the capacitance of grid source electric capacity, C
pixelfor the capacitance of pixel capacitance.
Preferably, when showing each frame picture, the polarity of the data voltage write for pixel cell in two adjacent lines is contrary, and be same pixel cell when two consecutive frame pictures show, the polarity of the data voltage of write is contrary.
Preferably, when showing each frame picture, in the row direction with on column direction, the polarity of the data voltage that two adjacent pixel unit write is contrary, and be same pixel cell when two consecutive frame pictures show, the polarity of the data voltage of write is contrary.
The technical scheme that solution the technology of the present invention problem adopts is a kind of display device, and it comprises above-mentioned display panel.
The present invention has following beneficial effect:
The driving method of display panel of the present invention, the stage is kept to adjust grid cut-off voltage at data voltage, by adjusting the size of grid cut-off voltage, for the data voltage in pixel cell carries out real-Time Compensation, to make data voltage remain constant, thus avoid the phenomenon of display frame appearance flicker.
Display panel of the present invention, the stage is kept to be adjusted grid cut-off voltage by voltage-adjusting unit at data voltage, by adjusting the size of grid cut-off voltage, for the data voltage in pixel cell carries out real-Time Compensation, remain constant to make data voltage, thus avoid the situation of display frame appearance flicker, therefore the display effect of display panel of the present invention is better.
Display device of the present invention, it comprises above-mentioned display panel, therefore its display effect is more excellent.
Accompanying drawing explanation
Fig. 1 is the schematic diagram for pixel cell electric leakage in the display panel of 60Hz of existing frame rate;
Fig. 2 is the schematic diagram for pixel cell electric leakage in the display panel of 30Hz of existing frame rate;
Fig. 3 is the RST in the driving method of display panel in prior art on grid line and data line;
Fig. 4 is the RST in the driving method of the display panel of embodiments of the invention 2 on grid line and data line;
Fig. 5 is the schematic diagram that the display panel of embodiments of the invention 2,3 adopts when going reversion display mode;
Schematic diagram when Fig. 6 is the display panel employing point reversion display mode of embodiments of the invention 2,3.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1:
The present embodiment provides a kind of driving method of display panel, and described display panel comprises many grid lines how arranged in a crossed manner and a plurality of data lines, and limits pixel cell at the crossover location of grid line and data line, and the driving method of the present embodiment comprises:
Data voltage write phase: pass into gate turn-on voltage to grid line, and by data line give by pass through into gate turn-on voltage grid line control pixel cell write data voltage.
Data voltage keeps the stage: pass into grid cut-off voltage to grid line, and adjust the size of described grid cut-off voltage, keeps constant to make the data voltage in described pixel cell.
Due in display panel procedure for displaying, each pixel cell is (data voltage keeps the stage) after charging complete, during the grid cut-off voltage passing into namely to the grid line be connected with this pixel cell, can not keep wherein writing data voltage in each pixel cell to remain unchanged, therefore will there will be pixel cell electric leakage, cause the phenomenon that display frame is glimmered.And in the driving method of the display panel of the present embodiment, keep the stage at data voltage, inputed to the size of the grid cut-off voltage on grid line by adjustment, keep constant to make the data voltage in pixel cell, thus solve due to pixel cell electric leakage, cause the phenomenon that display frame is glimmered.Specifically be described in conjunction with following embodiment.
Embodiment 2:
The present embodiment provides a kind of driving method of display panel, and described display panel comprises many grid line Gate and a plurality of data lines Data how arranged in a crossed manner, and limits pixel cell at the crossover location of grid line Gate and data line Data.
First, the concept of the rate of change of data voltage is introduced.
Concrete, when display one frame picture, the signal inputted every a line grid line Gate is square-wave signal; As shown in Figure 3, to scan wherein a line grid line Gate, wherein, gate turn-on voltage is high some ordinary mail V
gh; Corresponding grid cut-off voltage is low level signal V
gl; High some ordinary mail V is passed into this row grid line Gate
ghtime, this row pixel cell is opened, and data voltage writes in each pixel cell of this row by by data line Data; After this row pixel cell is all opened, this row grid line Gate is then passed into low level signal V
gl, until the beginning of next frame picture scanning, now this row pixel cell is in the data maintenance stage, and the voltage in this this period on grid line Gate is often low, and the data voltage now in this row pixel cell will leak electricity.Now, the rate of change of data voltage as shown by the dotted line in fig. 3, the namely change direction of data voltage size, when the polarity of the data voltage on data line Data is timing, the slope of the rate of change of data voltage is negative, when the polarity of the data voltage on data line Data is for time negative, the slope of the rate of change of data voltage is just.
Afterwards, the driving method specifically describing the display panel of the present embodiment comprises:
Data voltage write phase: pass into gate turn-on voltage to grid line Gate, and by data line Data give by pass through into gate turn-on voltage grid line Gate control pixel cell write data voltage.
Data write phase be identical in prior art, namely to pixel cell charging process, be not described in detail at this.
Data voltage keeps the stage: pass into grid cut-off voltage to grid line Gate, and according to the slope (namely the change direction of data voltage) of the rate of change of data voltage when not adjusting grid cut-off voltage size, adjust the size of described grid cut-off voltage, keep constant to make the data voltage in described pixel cell.
Wherein, the rate of change of grid cut-off voltage and the rate of change of data voltage are inversely proportional to.That is, the slope of the rate of change of data voltage is timing, and the slope of the rate of change of grid cut-off voltage is for bearing (namely from V
gl-ato V
gl-cdirection changes); The slope of the rate of change of data voltage is for time negative, and the slope of the rate of change of grid cut-off voltage is just (namely from V
gl-ato V
gl-bdirection changes).
Concrete, when not changing the size of grid cut-off voltage, the electricity missed in pixel cell is △ V, therefore by changing the size of grid cut-off voltage, also for compensating a data voltage △ V in pixel cell, will remain constant to make the data voltage in pixel cell.As shown in Figure 4, the amplitude of variation △ V of described grid cut-off voltage
glmeet with the data voltage △ V compensated in described pixel cell: △ V
gl* C
gs/ (C
gs+ C
pixel); Wherein, the amplitude of variation △ V of grid cut-off voltage
glthe grid cut-off voltage V of the end time in stage is kept for data voltage
gl-bthe grid cut-off voltage V of the initial time in stage is kept with data voltage
gl-adifference, i.e. △ V
gl=V
gl-b-V
gl-a(or △ V
gl=V
gl-c-V
gl-a); C
gsfor the capacitance of grid source electric capacity, C
pixelfor the capacitance of pixel capacitance; Be understandable that, pixel cell comprises thin film transistor (TFT), pixel electrode and public electrode, and wherein grid source electric capacity is the electric capacity formed between finger grid and source electrode; Pixel capacitance then refers to the electric capacity formed between pixel electrode and public electrode.
The driving method of the display panel provided in the present embodiment, the mode of picture shown by the driving method of this display panel can be that row reverses, also can be a reversion.
Concrete, as shown in Figure 5, display panel comprises many grid line Gate1-Gate5 and a plurality of data lines Data1-Data4, when showing each frame picture, the polarity of the data voltage write for pixel cell in two adjacent lines is contrary, and be same pixel cell when two consecutive frame pictures displays, the polarity of the data voltage of write is contrary.The mode of picture shown by the driving method of that is this display panel is row reversion.
Or, as shown in Figure 6, display panel comprises many grid line Gate1-Gate5 and a plurality of data lines Data1-Data4, when showing each frame picture, for in the row direction with on column direction, the polarity of the data voltage that two adjacent pixel unit write is contrary, and be same pixel cell when two consecutive frame pictures show, the polarity of the data voltage of write is contrary.The mode of picture shown by the driving method of that is this display panel is row reversion.The mode of picture shown by the driving method of that is this display panel is some reversion.
Due to the driving method of the display panel of the present embodiment, the stage is kept to adjust grid cut-off voltage at data voltage, by adjusting the size of grid cut-off voltage, for the data voltage in pixel cell carries out real-Time Compensation, to make data voltage remain constant, thus avoid the phenomenon of display frame appearance flicker.
Embodiment 3:
Present embodiments provide a kind of display panel, comprise many grid line Gate and a plurality of data lines Data how arranged in a crossed manner, and limiting pixel cell at the crossover location of grid line Gate and data line Data, this display panel also comprises: data write unit, grid voltage output unit, voltage-adjusting unit; Wherein, data write unit, for for by described data line Data be described pixel cell write data voltage; Grid voltage output unit, in data write phase for grid line Gate provides grid to open unit, keep the stage to provide grid cut-off voltage for grid line Gate at data voltage; Voltage-adjusting unit, for adjusting the size of described grid cut-off voltage, keeps constant to make the data voltage in described pixel cell.
Owing to having data write unit, grid voltage output unit, voltage-adjusting unit in the display panel of the present embodiment, therefore when display panel carries out picture display, in data write phase data, grid voltage output unit for grid line Gate provide grid open unit, opened by pixel cell, now data write unit is for by described data line Data being described pixel cell write data voltage; The stage is kept: grid voltage output unit provides grid cut-off voltage for grid line Gate at data voltage, pixel cell is turned off, now voltage-adjusting unit adjusts the size of described grid cut-off voltage, to make the data voltage in described pixel cell keep constant, thus avoid display frame due to the phenomenon of pixel cell electric leakage appearance flicker.
Concrete, voltage-adjusting unit specifically for, adjust the size of described grid cut-off voltage, be inversely proportional to the rate of change of the rate of change and grid cut-off voltage that make the data voltage of the data voltage write in pixel cell described in the data voltage maintenance stage.That is, the slope of the rate of change of data voltage is timing, and the slope of the rate of change of grid cut-off voltage is for bearing (namely from V
gl-ato V
gl-cdirection changes); The slope of the rate of change of data voltage is for time negative, and the slope of the rate of change of grid cut-off voltage is just (namely from V
gl-ato V
gl-bdirection changes).The method of concrete adjustment grid cut-off voltage size is identical with the method for embodiment 1, is not described in detail at this.
Concrete, when not changing the size of grid cut-off voltage, the electricity missed in pixel cell is △ V, therefore by changing the size of grid cut-off voltage, also for compensating a data voltage △ V in pixel cell, will remain constant to make the data voltage in pixel cell.As shown in Figure 4, the amplitude of variation △ V of described grid cut-off voltage
glmeet with the data voltage △ V compensated in described pixel cell: △ V
gl* C
gs/ (C
gs+ C
pixel); Wherein, the amplitude of variation △ V of grid cut-off voltage
glthe grid cut-off voltage V of the end time in stage is kept for data voltage
gl-bthe grid cut-off voltage V of the initial time in stage is kept with data voltage
gl-adifference, i.e. △ V
gl=V
gl-b-V
gl-a(or △ V
gl=V
gl-c-V
gl-a); C
gsfor the capacitance of grid source electric capacity, C
pixelfor the capacitance of pixel capacitance; Be understandable that, pixel cell comprises thin film transistor (TFT), pixel electrode and public electrode, and wherein grid source electric capacity is the electric capacity formed between finger grid and source electrode; Pixel capacitance then refers to the electric capacity formed between pixel electrode and public electrode.
The mode of picture shown by the display panel provided in the present embodiment can be that row reverses, also can be a reversion.
Concrete, as shown in Figure 5, display panel comprises many grid line Gate1-Gate5 and a plurality of data lines Data1-Data4, when showing each frame picture, the polarity of the data voltage write for pixel cell in two adjacent lines is contrary, and be same pixel cell when two consecutive frame pictures displays, the polarity of the data voltage of write is contrary.The mode of picture shown by the driving method of that is this display panel is row reversion.
Or, as shown in Figure 6, display panel comprises many grid line Gate1-Gate5 and a plurality of data lines Data1-Data4, when showing each frame picture, for in the row direction with on column direction, the polarity of the data voltage that two adjacent pixel unit write is contrary, and be same pixel cell when two consecutive frame pictures show, the polarity of the data voltage of write is contrary.The mode of picture shown by the driving method of that is this display panel is row reversion.The mode of picture shown by the driving method of that is this display panel is some reversion.
The display panel of the present embodiment, the stage is kept to be adjusted grid cut-off voltage by voltage-adjusting unit at data voltage, by adjusting the size of grid cut-off voltage, for the data voltage in pixel cell carries out real-Time Compensation, remain constant to make data voltage, thus avoid the situation of display frame appearance flicker, therefore the display effect of the display panel of the present embodiment is better.
Embodiment 4:
Present embodiments provide in a kind of display device, it comprises above-mentioned display panel, therefore the display effect of the display device of the present embodiment is better.
This display device can be: any product or parts with Presentation Function such as liquid crystal panel, Electronic Paper, oled panel, mobile phone, panel computer, televisor, display, notebook computer, digital album (digital photo frame), navigating instrument.
Be understandable that, the illustrative embodiments that above embodiment is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (11)
1. a driving method for display panel, described display panel comprises many grid lines how arranged in a crossed manner and a plurality of data lines, and limits pixel cell at the crossover location of grid line and data line, it is characterized in that, described driving method comprises:
Data voltage write phase: pass into gate turn-on voltage to grid line, and by data line give by pass through into gate turn-on voltage grid line control pixel cell write data voltage;
Data voltage keeps the stage: pass into grid cut-off voltage to grid line, and adjust the size of described grid cut-off voltage, keeps constant to make the data voltage in described pixel cell.
2. the driving method of display panel according to claim 1, is characterized in that, the rate of change of the data voltage write in pixel cell described in the data voltage maintenance stage and the rate of change of grid cut-off voltage are inversely proportional to.
3. the driving method of display panel according to claim 2, is characterized in that, the amplitude of variation △ V of described grid cut-off voltage
glmeet with the data voltage △ V compensated in described pixel cell: △ V
gl* C
gs/ (C
gs+
pixelc
pixel); Wherein, C
gsfor the capacitance of grid source electric capacity, C
pixelfor the capacitance of pixel capacitance.
4. the driving method of the display panel according to any one of claim 1-3, it is characterized in that, when showing each frame picture, the polarity of the data voltage write for pixel cell in two adjacent lines is contrary, and be same pixel cell when two consecutive frame pictures displays, the polarity of the data voltage of write is contrary.
5. the driving method of the display panel according to any one of claim 1-3, it is characterized in that, when showing each frame picture, for in the row direction with on column direction, the polarity of the data voltage that two adjacent pixel unit write is contrary, and be same pixel cell when two consecutive frame pictures displays, the polarity of the data voltage of write is contrary.
6. a display panel, comprise many grid lines how arranged in a crossed manner and a plurality of data lines, and limit pixel cell at the crossover location of grid line and data line, it is characterized in that, described display panel also comprises:
Data write unit, for for by described data line be described pixel cell write data voltage;
Grid voltage output unit, in data write phase for grid line provides grid to open unit, keep the stage to provide grid cut-off voltage for grid line at data voltage;
Voltage-adjusting unit, for adjusting the size of described grid cut-off voltage, keeps constant to make the data voltage in described pixel cell.
7. display panel according to claim 6, it is characterized in that, described voltage-adjusting unit specifically for, adjust the size of described grid cut-off voltage, be inversely proportional to the rate of change of the data voltage rate of change and grid cut-off voltage that make the data voltage write in pixel cell described in the data voltage maintenance stage.
8. display panel according to claim 7, is characterized in that, the amplitude of variation △ V of described grid cut-off voltage
glmeet with the data voltage △ V compensated in described pixel cell: △ V
gl* C
gs/ (C
gs+ C
pixel); Wherein, C
gsfor the capacitance of grid source electric capacity, C
pixelfor the capacitance of pixel capacitance.
9. the display panel according to any one of claim 6-8, it is characterized in that, when showing each frame picture, the polarity of the data voltage write for pixel cell in two adjacent lines is contrary, and be same pixel cell when two consecutive frame pictures displays, the polarity of the data voltage of write is contrary.
10. the display panel according to any one of claim 6-8, it is characterized in that, when showing each frame picture, for in the row direction with on column direction, the polarity of the data voltage that two adjacent pixel unit write is contrary, and be same pixel cell when two consecutive frame pictures displays, the polarity of the data voltage of write is contrary.
11. 1 kinds of display device, is characterized in that, described display device comprises the display panel according to any one of claim 6-10.
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|---|---|---|---|
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| WO2017118100A1 (en) * | 2016-01-08 | 2017-07-13 | 京东方科技集团股份有限公司 | Display driving method, display panel and display device |
| CN107578746A (en) * | 2017-10-17 | 2018-01-12 | 京东方科技集团股份有限公司 | Image element driving method, device and display device |
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