CN103176319B - Display panel and driving method thereof - Google Patents
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- CN103176319B CN103176319B CN201110431525.7A CN201110431525A CN103176319B CN 103176319 B CN103176319 B CN 103176319B CN 201110431525 A CN201110431525 A CN 201110431525A CN 103176319 B CN103176319 B CN 103176319B
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- 238000012423 maintenance Methods 0.000 claims description 59
- 238000003491 array Methods 0.000 claims description 11
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- 239000004973 liquid crystal related substance Substances 0.000 description 30
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Abstract
A display panel and a driving method thereof, the display panel includes: the TFT array substrate comprises a plurality of scanning lines and a plurality of data lines, and the plurality of scanning lines and the plurality of data lines are crossed to define a plurality of pixel units; each pixel unit comprises a TFT switch, a pixel electrode and a storage capacitor, wherein the grid electrode of the TFT switch is connected with a scanning line, the source electrode of the TFT switch is connected with a data line, and the drain electrode of the TFT switch is connected with the pixel electrode; the refresh frequency of the scanning signals is less than 50 Hz, each frame of scanning signals is divided into a signal updating stage and a picture maintaining stage, the capacitance value of the storage capacitor meets a preset value, and the image display is ensured to be maintained in the picture maintaining stage after the signal updating stage of the current frame of scanning signals is finished and before the signal updating stage of the next frame of scanning signals arrives, wherein data signals are input into the display panel in the signal updating stage, and no data signals are input into the display panel in the picture maintaining stage. The technical scheme can reduce power consumption.
Description
Technical field
The present invention relates to display field, particularly relate to display panel and driving method thereof.
Background technology
Along with the development of information society, the demand of people to display device obtains growth.In order to meet this requirement, nearest several flat panel display equipment is as thin film transistor LCD device (TFT-LCD), and plasma display device (PDP) is obtained for swift and violent development.In the middle of flat-panel display device, thin film transistor LCD device due to its weight low, volume is little, low power consumption and other advantages, occupies the leading position of flat pannel display step by step.
Along with the development of lcd technology, existing display panels has transmission-type liquid crystal display panel, reflective liquid crystal display panel and half-reflection and half-transmission type display panels.Transmission-type liquid crystal display panel is adapted at indoor and watches, and when surround lighting is stronger, transmission-type liquid crystal display panel is because of the decline of comparison degree, and viewing effect is poor.Reflective liquid crystal display panel is applicable to utilizing surround lighting to show.Half-reflection and half-transmission type display panels is not only adapted at indoor and watches, and when surround lighting is stronger, also well can watch, can not affect viewing because of the reflection of surround lighting, therefore half-reflection and half-transmission type display panels is more and more subject to the favor of portable display device.
The liquid crystal indicator of prior art comprises: tft array substrate, described tft array substrate comprises TFT switch arrays, memory capacitance array, the data line be connected with TFT switch arrays and sweep trace, and each memory capacitance comprises: the public electrode be oppositely arranged, pixel electrode, dielectric layer between described public electrode and pixel electrode.When liquid crystal indicator be reflective LCD device or half-reflection and half-transmission formula liquid crystal indicator time, the pixel electrode of echo area also comprising reflection horizon, realizing reflective display for carrying out reflection to surround lighting.
No matter be transmission liquid crystal display device, reflective LCD device or semi-reflecting semitransparent liquid crystal display device, its working method is: to sweep trace input sweep signal, the unlatching of control TFT switch; To data line input data signal, when TFT switch open, data-signal inputs to memory capacitance, when next frame sweep signal arrives, maintains the voltage on pixel electrode by memory capacitance, thus maintains the display of image.
Although the power dissipation ratio transmission display device of reflective LCD device, half-reflection and half-transmission formula liquid crystal indicator is low in energy consumption, but the sweep frequency of sweep signal is 50-70 hertz (HZ) in prior art, because the voltage in sweep signal is all the time with this high-frequency mode input display panel, therefore the power consumption of reflective LCD device, half-reflection and half-transmission formula liquid crystal indicator is still higher comparatively speaking.
Summary of the invention
The problem that the present invention solves be the reflective LCD device of prior art, half-reflection and half-transmission formula liquid crystal indicator power consumption high.
For solving the problem, the invention provides a kind of display panel, comprising:
Tft array substrate, described tft array substrate comprises multi-strip scanning line and a plurality of data lines, and described multi-strip scanning line and a plurality of data lines intersection limit multiple pixel cell;
Each pixel cell comprises TFT switch, pixel electrode and memory capacitance, and the grid of described TFT switch connects sweep trace, and source electrode is connected to data line, and drain electrode is connected to pixel electrode;
The refreshing frequency of sweep signal is less than 50 hertz, each frame scan signal is divided into signal update stage and picture maintenance stage, the capacitance of described memory capacitance meets predetermined value, guarantee after the signal update stage of present frame sweep signal terminates, before the signal update stage arrival of next frame sweep signal, image display is maintained in the picture maintenance stage, wherein, there is data-signal input display panel in the signal update stage, and the picture maintenance stage does not have data-signal input display panel.
Alternatively, described memory capacitance comprises the public electrode, pixel electrode, the dielectric layer between described public electrode and pixel electrode that are oppositely arranged; Or described memory capacitance comprise be oppositely arranged public electrode, drain electrode, described public electrode and drain electrode between dielectric layer.
Alternatively, described predetermined value is 551fF × 75% ~ 551fF × 125%.
Alternatively, also comprise: driving circuit, be electrically connected with described data line, sweep trace, for described data line input data signal, to described sweep trace input sweep signal.
Alternatively, the first driving circuit, the second driving circuit and gauge tap array is also comprised;
Described first driving circuit is electrically connected with described sweep trace, data line;
Described second driving circuit is electrically connected with described sweep trace by described gauge tap array.
Alternatively, described gauge tap is TFT switch, and the drain electrode of this TFT switch is electrically connected with sweep trace, and grid, source electrode are electrically connected with described second driving circuit respectively.
Alternatively, described display panel is total-reflection type display panels, half-reflection and half-transmission formula display panels or electronic paper display panel.
The present invention also provides a kind of driving method of described display panel, comprising: to described sweep trace input sweep signal, to described data line input data signal;
The refreshing frequency of described sweep signal is less than 50 hertz, and each frame scan signal is divided into signal update stage and picture maintenance stage, and wherein, there is data-signal input display panel in the signal update stage, and the picture maintenance stage does not have data-signal input display panel;
After the present frame sweep signal end of scan, maintain the picture maintenance stage of the schedule time, after the picture maintenance stage terminates, input next frame sweep signal.
Alternatively, the described schedule time is 0.02s × 50% ~ 0.02s × 150%.
Alternatively, by driving circuit to described sweep trace input sweep signal, to described data line input data signal.
Alternatively, described display panel also comprises the first driving circuit, the second driving circuit and gauge tap array;
Described first driving circuit is electrically connected with described sweep trace, data line;
Described second driving circuit is electrically connected with described sweep trace by described gauge tap array;
In the signal update stage, the first driving circuit is in running order, and to sweep trace input sweep signal, to data line input data signal, the second driving circuit is in off position;
In the picture maintenance stage, described TFT switch arrays, are closed to described sweep trace input low level signal by gauge tap array by described second driving circuit.
Alternatively, described gauge tap is TFT switch, and the drain electrode of described gauge tap is electrically connected with sweep trace, and grid, source electrode are electrically connected with described second driving circuit respectively;
In the picture maintenance stage, described second driving circuit is to the grid input high level signal of described gauge tap array, to the source electrode input low level signal of described gauge tap array, by the drain electrode of gauge tap array to sweep trace input low level signal, described TFT switch arrays are closed.
Compared with prior art, the present invention has the following advantages:
The display panel of the technical program, by increasing memory capacitance, thus holding time of display panel picture is increased after TFT switch cuts out, so just can reduce the sweep frequency of sweep signal, each frame scan signal is divided into signal update stage and picture maintenance stage, there is data-signal input display panel in the signal update stage, and the picture maintenance stage does not have data-signal input display panel.When the capacitance of memory capacitance meets predetermined value, described predetermined value is guaranteed after the signal update stage of Current Scan signal frame terminates, and before the signal update stage arrival of next frame sweep signal frame, can maintain image display in the picture maintenance stage.That is, technical scheme of the present invention, reduces the sweep frequency of sweep signal, and the frequencies go lower of the input display panel of the voltage therefore in sweep signal also just can reduce the power consumption of display panel accordingly.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the dot structure of the reflecting type liquid crystal display panel of the specific embodiment of the invention;
Fig. 2 is the schematic diagram of the storage capacitor construction of the display reflecting type liquid crystal display panel of the specific embodiment of the invention;
Fig. 3 is the cross-sectional view of dot structure along the A-A direction shown in Fig. 1 of the specific embodiment of the invention;
Fig. 4 is the sequential chart of the type of drive of the reflecting type liquid crystal display panel of the specific embodiment of the invention;
Fig. 5 is the another kind of Drive and Control Circuit schematic diagram of display panel of the present invention;
Fig. 6 is the sequential chart of the type of drive of the Drive and Control Circuit shown in Fig. 5;
Fig. 7 is the schematic diagram of the dot structure of specific embodiment of the invention half-reflection and half-transmission formula display panels;
Fig. 8 is specific embodiment of the invention half-reflection and half-transmission formula display panels storage capacitor construction schematic diagram;
Fig. 9 is the cross-sectional view of dot structure along the B-B direction shown in Fig. 7 of the specific embodiment of the invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here to implement with multiple, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention.Therefore the present invention is not by the restriction of following public embodiment.
Display panel of the present invention can be reflecting type liquid crystal display panel, half-reflection and half-transmission formula display panels and electronic paper display panel.Display panel of the present invention is described in detail below for reflecting type liquid crystal display panel.
Display panel of the present invention comprises tft array substrate, and described tft array substrate comprises multi-strip scanning line and a plurality of data lines, and described multi-strip scanning line and a plurality of data lines intersection limit multiple pixel cell;
Each pixel cell comprises a TFT switch, a pixel electrode and a memory capacitance, and the grid of described TFT switch connects sweep trace, and the source electrode of described TFT switch is connected to data line, and the drain electrode of described TFT switch is connected to pixel electrode;
Wherein, the refreshing frequency of the sweep signal of sweep trace is less than 50 hertz, each frame scan signal is divided into signal update stage and picture maintenance stage, the capacitance of described memory capacitance meets predetermined value, guarantee after the signal update stage of present frame sweep signal terminates, before the signal update stage arrival of next frame sweep signal, image display is maintained in the picture maintenance stage, wherein, there is data-signal input display panel in the signal update stage, and the picture maintenance stage does not have data-signal input display panel.
Fig. 1 is the schematic diagram of the dot structure of the reflecting type liquid crystal display panel of the specific embodiment of the invention, Fig. 2 is the schematic diagram of the storage capacitor construction of the reflecting type liquid crystal display panel of the specific embodiment of the invention, Fig. 3 is the cross-sectional view of dot structure along the A-A direction shown in Fig. 1 of the specific embodiment of the invention, in conjunction with reference to figure 1, Fig. 2 and Fig. 3, the tft array substrate of reflecting type liquid crystal display panel comprises:
Substrate 10, described substrate 10 is provided with multi-strip scanning line and a plurality of data lines, and described multi-strip scanning line and a plurality of data lines intersection limit multiple pixel cell;
Each pixel cell comprises TFT switch, covers passivation layer 27, the organic film 28 be positioned on passivation layer 27, the pixel electrode 21 be positioned on organic film 28, the reflecting electrode 22 be positioned on pixel electrode 21 of TFT switch arrays, reflecting electrode 22 has multiple protruding 24, and protruding 24 can realize the diffuse reflection to light.
TFT switch comprises: be arranged in the gate dielectric layer 26 of the grid 11 on substrate 10, covered substrate 10 and grid 11, the active area (Fig. 3 does not show) be positioned on gate dielectric layer 26, be positioned at both sides, active area source electrode 12 and drain electrode 13; Described grid 11 is connected with sweep trace 14, and described source electrode 12 connection data line 15, described drain electrode 13 through hole 25 is electrically connected with pixel electrode 21.
Pixel cell also comprises the public electrode 23 with grid 11 same layer of TFT switch.
There is thicker organic film 28 between pixel electrode 21 and public electrode 23, therefore it is very little that the electric capacity between pixel electrode 21 and public electrode 23 becomes, because pixel electrode 21 is electrically connected with drain electrode 13 by through hole 25, therefore pixel electrode 21 has identical current potential with drain electrode 13, and the memory capacitance therefore in reflecting type liquid crystal display panel can be made up of drain electrode 13, public electrode 23 and gate dielectric layer between the two 26.In other embodiments, pixel electrode, public electrode and the insulation course between described pixel electrode and public electrode also can form memory capacitance.
In the present embodiment, owing to being reflective display, the size increasing drain electrode 13 or public electrode 23 can not affect the aperture opening ratio of pixel.
The working method of described display panels is: to sweep trace input sweep signal, the unlatching of control TFT switch, to data line input data signal, when TFT switch open, data-signal inputs to memory capacitance, when next frame sweep signal arrives, maintain the voltage on pixel electrode by memory capacitance, thus maintain the display of image.In prior art, because the size of memory capacitance is certain, therefore, the sweep frequency of sweep signal is generally 50-70 hertz (HZ), ensures the continuous display of image with this.Because the voltage in sweep signal is all the time with this high-frequency mode input display panel, therefore the power consumption of liquid crystal indicator is higher.
In the specific embodiment of the invention, each frame scan signal is divided into signal update stage and picture maintenance stage, the frequency of the sweep signal of sweep trace is less than 50 hertz, and increase the capacitance of memory capacitance, the capacitance of memory capacitance is made to meet predetermined value, can guarantee after the signal update stage of present frame sweep signal terminates, before the signal update stage arrival of next frame sweep signal, image display is maintained in the picture maintenance stage, wherein, there is data-signal input display panel in the signal update stage, and the picture maintenance stage does not have data number input display panel.Because the refreshing frequency of sweep signal reduces, the power consumption of corresponding display device decreases.
Because reflective LCD device is reflective display, the area increasing drain electrode or public electrode can not affect the aperture opening ratio of pixel, can increase memory capacitance by the area increasing drain electrode and public electrode.In the specific embodiment of the invention, reduced the refreshing frequency of sweep signal by the value increasing memory capacitance, reduce the power consumption of display device with this.
Fig. 4 is the sequential chart of the type of drive of the reflecting type liquid crystal display panel of the specific embodiment of the invention, with reference to figure 4, the sweep frequency of the sweep signal of the reflecting type liquid crystal display panel of the specific embodiment of the invention is less than 50HZ, each frame scan signal 30 is divided into signal update stage and picture maintenance stage, the signal update stage is successively to the first to n-th line sweep trace input high level pulse signal such as 15V, make the TFT switch open of corresponding row, the data-signal inputted in the data line of respective column can input to corresponding pixel, makes respective pixel show image; After the scanning that sweep signal completes the sweep trace of all row, enter the picture maintenance stage of sweep signal, stop to display panel input sweep signal in this picture maintenance stage, the sweep trace of all row is all in electronegative potential such as-10V, therefore all TFT switches are all in closed condition, whole display panel does not have data-signal to input, and maintains the display of picture in this picture maintenance stage by memory capacitance.Owing to inputting without the need to data-signal in the picture maintenance stage, therefore power consumption can be reduced.
Wherein, time of picture maintenance stage needs and the size of display panel memory capacitance matches, and when memory capacitance is large, the time of picture maintenance stage is corresponding elongated, and when memory capacitance hour, the time of picture maintenance stage is corresponding to diminish.
In prior art, the size of memory capacitance is generally tens flying method (fF, 1fF=10
-15f), because reflective LCD device pixel aperture ratio is not subject to the restriction of public electrode and drain area, the area of public electrode or drain electrode can therefore be increased to increase aperture opening ratio.The method increasing the capacitance of memory capacitance is not limited to the area increasing public electrode or drain electrode, also can be realized by the method for the distance changed between the two or the dielectric layer replaced between the two.
In the specific embodiment of the invention, the value of memory capacitance should meet 551fF × 75% ~ 551fF × 125%.Further, the time of picture maintenance stage is associated with the capacitance of memory capacitance, and when the capacitance of memory capacitance becomes large, the time of picture maintenance stage is corresponding elongated, when the capacitance of memory capacitance diminishes, and the time shorter of picture maintenance stage.Preferably, the time of picture maintenance stage is 0.02s × 50% ~ 0.02s × 150%.
Length breadth ratio due to TFT switch needs to adapt with the capacitance of memory capacitance, therefore in the specific embodiment of the invention, when memory capacitance increases, the length breadth ratio of corresponding TFT switch also needs to increase, long and the wide length that refers to TFT switch channel respectively and wide, when the value of memory capacitance is 551fF, the length breadth ratio W/L of TFT switch is 36/5.5.
The display panel of the specific embodiment of the invention also comprises color membrane substrates, arrange with tft array substrate, all there is polaroid at the back side of tft array substrate and color membrane substrates, between color membrane substrates and tft array substrate, there is liquid crystal layer, it is the known technology of those skilled in the art, does not repeat at this.
In this embodiment, display panel also comprises peripheral driving circuit, and this driving circuit is electrically connected with described data line, sweep trace, for described data line input data signal, input sweep signal to described sweep trace.The refreshing frequency of sweep signal is less than 50HZ, and each frame scan signal is divided into signal update stage and picture maintenance stage.In the signal update stage, driving circuit is to fine scanning line successively input high level pulse signal such as 15V, in other words conj.or perhaps not to fine scanning line input sweep signal, driving in the present invention to display panel is realized with this to fine scanning line successively input low level such as-10V in the picture maintenance stage.
Fig. 5 is the another kind of Drive and Control Circuit schematic diagram of the display panel of the specific embodiment of the invention, in the present invention, owing to not relating to the improvement to data line input signal, in Fig. 5, does not illustrate data line, only illustrates sweep trace.In conjunction with reference to figure 5 and Fig. 1, in the display panel of the specific embodiment of the invention, display panel also comprises the first driving circuit 31, second driving circuit 32 and gauge tap 33 array; Described first driving circuit 31 is electrically connected with described sweep trace, data line; Described second driving circuit 32 is electrically connected with described sweep trace by described gauge tap 33 array; In the signal update stage, the first driving circuit 31 is in running order, and to sweep trace input sweep signal, to data line input data signal, the second driving circuit 32 is in off position; In the picture maintenance stage, described TFT switch arrays, are closed to described sweep trace input low level signal by gauge tap 33 array by described second driving circuit 32.Concrete, one end of sweep trace 14 is electrically connected with the grid 11 of described TFT switch, and the other end is electrically connected with described gauge tap 33; Described gauge tap 33 is electrically connected with described second driving circuit 32.In this embodiment, gauge tap 33 is TFT switch, and the drain electrode of this TFT switch is electrically connected with the other end of sweep trace 14, and grid, source electrode are electrically connected with described second driving circuit 32 respectively.
Fig. 6 is the time diagram of the Drive and Control Circuit work shown in Fig. 5, and in conjunction with reference to figure 5 and Fig. 6, this driving circuit drives the process of display panel work to be:
In the signal update stage, the first driving circuit 31 successively to the first to n-th line sweep trace input high level pulse signal such as 15V, and to data line input data signal; In this signal update stage, gauge tap 33 is in closed condition, and the second driving circuit 32 is in off position, is specially, grid from the second driving circuit 32 to this gauge tap 33, source electrode input voltage be 0.
In the picture maintenance stage, the first driving circuit 31 is in off position; Further, in the picture maintenance stage, the second driving circuit 32 is in running order, and gauge tap 33 is in opening, by this gauge tap 33 to 1 to n-th line sweep trace successively input low level signal such as-10V; Be specially, second driving circuit 32 is to the grid input high level signal such as 15V of this gauge tap 33 array, gauge tap 33 array is made to be in opening, second driving circuit 32 is to the source electrode input low level signal such as-10V of this gauge tap 33 array, by the drain electrode of this gauge tap 33 array to the first to n-th line sweep trace input low level signal, make the TFT switch arrays being in pixel region be in closed condition, keep the picture maintenance stage.
The display panel of the specific embodiment of the invention also can be half-reflection and half-transmission formula display panel, Fig. 7 is the schematic diagram of the dot structure of the half-reflection and half-transmission formula display panels of the specific embodiment of the invention, Fig. 8 is the schematic diagram of the storage capacitor construction of the half-reflection and half-transmission formula display panels of the specific embodiment of the invention, Fig. 9 is the cross-sectional view of dot structure along the B-B direction shown in Fig. 7 of the specific embodiment of the invention, in conjunction with reference to figure 7, Fig. 8 and Fig. 9, the half-reflection and half-transmission formula display panels of the specific embodiment of the invention comprises:
Substrate 60, described substrate 10 is provided with multi-strip scanning line and a plurality of data lines, and described multi-strip scanning line and a plurality of data lines intersection limit multiple pixel cell;
Each pixel cell comprises TFT switch, covers passivation layer 67, the organic film 68 be positioned on passivation layer 67, the pixel electrode 71 be positioned on organic film 68 of TFT switch arrays; Be positioned at the reflecting electrode 72 on pixel electrode 71 in echo area, wherein echo area is around transmission area 100, and reflecting electrode 72 has multiple protruding 74, and protruding 74 can realize the diffuse reflection to light.
TFT switch comprises: be positioned at the gate dielectric layer 66 of the grid 61 on substrate 60, covered substrate 60 and grid 61, the active area (not shown) be positioned on gate dielectric layer 66, be positioned at both sides, active area source electrode 62 and drain electrode 63; Described grid 61 is connected with sweep trace 64, the data line 65 that described source electrode 62 connects, and described drain electrode 63 is connected with pixel electrode 71 by through hole 75.
Pixel cell also comprises the public electrode 73 with grid 61 same layer of TFT switch.
There is thicker organic film 68 between pixel electrode 71 and public electrode 73, therefore it is very little that the electric capacity between pixel electrode 72 and public electrode 73 becomes, because pixel electrode 71 is electrically connected with drain electrode 63 by through hole 75, therefore pixel electrode 71 has identical current potential with drain electrode 63, in half-reflection and half-transmission formula display panels, in order to not affect pixel aperture ratio, drain electrode 63 is positioned at echo area, and drain electrode 63, public electrode 73 and gate dielectric layer between the two 66 constitute memory capacitance.In other embodiments, pixel electrode, public electrode and the insulation course between described pixel electrode and public electrode also can form memory capacitance.
Half-reflection and half-transmission formula display panels, 63 be positioned at echo area owing to draining and be not positioned at transmission area, therefore the area increasing drain electrode 63 can not affect the aperture opening ratio of pixel, and public electrode 73 is arranged at reflector space, and the area therefore increasing public electrode 73 also can not affect the aperture opening ratio of pixel.
The half-reflection and half-transmission formula display panels of the specific embodiment of the invention, realizes by the capacitance increasing memory capacitance the object reducing power consumption.In the present embodiment, the frequency of sweep signal is less than 50 hertz, each frame scan signal is divided into signal update stage and picture maintenance stage, the predetermined value of described memory capacitance is guaranteed after the signal update stage of present frame sweep signal terminates, before the signal update stage arrival of next frame sweep signal, image display is maintained in the picture maintenance stage, wherein, there is sweep signal input display panel in the signal update stage, and the picture maintenance stage does not have sweep signal input display panel.
The working method of half-reflection and half-transmission formula display panels is identical with the work basic mode of reflecting type liquid crystal display panel, therefore the peripheral drive circuit of total-reflection type display panels can be applied to half-reflection and half-transmission formula display panels, that is, half-reflection and half-transmission display panels can be applied to the detailed content that Fig. 4 to Fig. 6 describes above, not repeat at this.
Display panel of the present invention is not only applicable to half-reflection and half-transmission formula display panels, reflecting type liquid crystal display panel, also electronic paper display panel is applicable to, the principle of work of electronic paper display panel is identical with the principle of work of reflecting type liquid crystal display panel, do not repeat at this, those skilled in the art unquestionablely can know the electronic paper display panel of the specific embodiment of the invention by inference according to the reflecting type liquid crystal display panel of the specific embodiment of the invention and electronic paper display panel of the prior art, to reach the object reducing Electronic Display Panel power consumption.
Based on the display panel of above-described specific embodiment, with reference to figure 4, the present invention also provides the driving method of the display panel described in more than one, comprising: input sweep signal successively to described sweep trace i.e. the first to n-th line sweep trace, to described data line input data signal; The refreshing frequency of described sweep signal is less than 50 hertz, and each frame scan signal 30 is divided into signal update stage and picture maintenance stage, and wherein, there is data-signal input display panel in the signal update stage, and the picture maintenance stage does not have data-signal input display panel; After the present frame sweep signal end of scan, maintain the picture maintenance stage of the schedule time, after the picture maintenance stage terminates, input next frame sweep signal.Wherein, the schedule time is 0.02s × 50% ~ 0.02s × 150%.Describing more specifically can see the associated description of above appropriate section.
In the present embodiment, can by peripheral driving circuit to described data line input data signal, to described sweep trace input sweep signal.In the signal update stage, driving circuit is to sweep trace input high level pulse signal such as 15V, in other words not to sweep trace input sweep signal, driving in the present invention to display panel is realized with this to sweep trace input low level such as-10V in the picture maintenance stage.
In conjunction with reference to figure 5 and Fig. 6, in another embodiment, the driving method of display panel can also be: in the signal update stage, the first driving circuit 31 successively to the first to n-th line sweep trace input high level pulse signal such as 15V, and to data line input data signal; In this signal update stage, gauge tap 33 is in closed condition, and the second driving circuit 33 is in off position, is specially, grid from the second driving circuit 32 to this gauge tap 33, source electrode input voltage be 0.In the picture maintenance stage, the first driving circuit 31 is in off position; Further, in the picture maintenance stage, the second driving circuit 32 is in running order, and gauge tap 33 is in opening, by this gauge tap 33 array to the first to n-th line sweep trace input low level signal such as-10V; Be specially, second driving circuit 32 is to the grid input high level signal such as 15V of this gauge tap 33 array, gauge tap 33 array is made to be in opening, second driving circuit 32 is to the source electrode input low level signal such as-10V of this gauge tap 33 array, by the drain electrode of this gauge tap 33 array to the first to n-th line sweep trace input low level signal, make the TFT switch arrays being in pixel region be in closed condition, keep the picture maintenance stage.
The display panel of the technical program, by increasing memory capacitance, thus holding time of display panel picture is increased after TFT switch cuts out, so just can reduce the sweep frequency of sweep signal, each frame scan signal is divided into signal update stage and picture maintenance stage, there is data-signal input display panel in the signal update stage, and the picture maintenance stage does not have data-signal input display panel.When the capacitance of memory capacitance meets predetermined value, described predetermined value is guaranteed after the signal update stage of Current Scan signal frame terminates, and before the signal update stage arrival of next frame sweep signal frame, can maintain image display in the picture maintenance stage.That is, technical scheme of the present invention, reduces the sweep frequency of sweep signal, and the frequencies go lower of the input display panel of the voltage therefore in sweep signal also just can reduce the power consumption of display panel accordingly.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection domain of technical solution of the present invention.
Claims (12)
1. a display panel, is characterized in that, comprising:
Tft array substrate,
Described tft array substrate comprises multi-strip scanning line and a plurality of data lines, and described multi-strip scanning line and a plurality of data lines intersection limit multiple pixel cell;
Each pixel cell comprises TFT switch, pixel electrode and memory capacitance, and the grid of described TFT switch connects sweep trace, and source electrode is connected to data line, and drain electrode is connected to pixel electrode;
The sweep signal refreshing frequency of sweep trace is less than 50 hertz, and each frame scan signal is divided into signal update stage and picture maintenance stage, the capacitance of described memory capacitance meets predetermined value, guarantee after the signal update stage of present frame sweep signal terminates, before the signal update stage arrival of next frame sweep signal, maintain image display in the picture maintenance stage, wherein, there is data-signal input display panel in the signal update stage, and the picture maintenance stage does not have data-signal input display panel.
2. display panel as claimed in claim 1, is characterized in that, described memory capacitance comprises the public electrode, pixel electrode, the dielectric layer between described public electrode and pixel electrode that are oppositely arranged; Or described memory capacitance comprise be oppositely arranged public electrode, drain electrode, described public electrode and drain electrode between dielectric layer.
3. display panel as claimed in claim 1, it is characterized in that, described predetermined value is 551fF × 75% ~ 551fF × 125%.
4. display panel as claimed in claim 1, is characterized in that, also comprise: driving circuit, be electrically connected with described data line, sweep trace, for described data line input data signal, input sweep signal to described sweep trace.
5. display panel as claimed in claim 1, is characterized in that, also comprise the first driving circuit, the second driving circuit and gauge tap array;
Described first driving circuit is electrically connected with described sweep trace, data line;
Described second driving circuit is electrically connected with described sweep trace by described gauge tap array.
6. display panel as claimed in claim 5, it is characterized in that, described gauge tap is TFT switch, and the drain electrode of this TFT switch is electrically connected with sweep trace, and grid, source electrode are electrically connected with described second driving circuit respectively.
7. display panel as claimed in claim 1, it is characterized in that, described display panel is total-reflection type display panels, half-reflection and half-transmission formula display panels or electronic paper display panel.
8. a driving method for the display panel described in any one of claim 1 to 7, comprising: to described sweep trace input sweep signal, to described data line input data signal;
It is characterized in that,
The refreshing frequency of described sweep signal is less than 50 hertz, and each frame scan signal is divided into signal update stage and picture maintenance stage, and wherein, there is data-signal input display panel in the signal update stage, and the picture maintenance stage does not have data-signal input display panel;
After the present frame sweep signal end of scan, maintain the picture maintenance stage of the schedule time, after the picture maintenance stage terminates, input next frame sweep signal.
9. the driving method of display panel as claimed in claim 8, it is characterized in that, the described schedule time is 0.02s × 50% ~ 0.02s × 150%.
10. the driving method of display panel as claimed in claim 8, is characterized in that, by driving circuit to described sweep trace input sweep signal, to described data line input data signal.
The driving method of 11. display panels as claimed in claim 8, it is characterized in that, described display panel also comprises the first driving circuit, the second driving circuit and gauge tap array;
Described first driving circuit is electrically connected with described sweep trace, data line;
Described second driving circuit is electrically connected with described sweep trace by described gauge tap array;
In the signal update stage, the first driving circuit is in running order, and to sweep trace sweep signal, to data line input data signal, the second driving circuit is in off position;
In the picture maintenance stage, described TFT switch arrays, are closed to described sweep trace input low level signal by gauge tap array by described second driving circuit.
The driving method of 12. display panels as claimed in claim 11, it is characterized in that, described gauge tap is TFT switch, and the drain electrode of described gauge tap is electrically connected with sweep trace, and grid, source electrode are electrically connected with described second driving circuit respectively;
In the picture maintenance stage, described second driving circuit is to the grid input high level signal of described gauge tap array, to the source electrode input low level signal of described gauge tap array, by the drain electrode of gauge tap array to sweep trace input low level signal, described TFT switch arrays are closed.
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| CN105390109A (en) * | 2015-12-07 | 2016-03-09 | 惠州Tcl移动通信有限公司 | Driving display method and liquid crystal display device |
| CN106205525B (en) * | 2016-07-13 | 2019-04-05 | 京东方科技集团股份有限公司 | The driving method and liquid crystal display panel of liquid crystal display panel |
| CN108122535B (en) * | 2016-11-28 | 2021-01-01 | 昆山国显光电有限公司 | AMOLED display screen, drive control circuit thereof and VR |
| CN106531105B (en) * | 2016-12-26 | 2019-06-28 | 上海天马微电子有限公司 | Display panel driving method and display panel |
| CN108986749B (en) * | 2017-06-05 | 2020-07-10 | 京东方科技集团股份有限公司 | Pixel unit, driving method, display panel, display method and display device |
| CN111243480B (en) * | 2020-01-17 | 2022-05-24 | 昆山国显光电有限公司 | Display panel driving method and display device |
| CN114495850A (en) * | 2020-10-23 | 2022-05-13 | 群创光电股份有限公司 | Electronic device and electronic device driving method |
| CN112419993B (en) * | 2020-11-28 | 2023-05-30 | 广东志慧芯屏科技有限公司 | Low-power-consumption low-frequency driving method and system using time-sharing driving |
| CN112669752B (en) * | 2020-12-28 | 2023-07-14 | 武汉天马微电子有限公司 | Display panel driving method and display device |
| CN113707081B (en) * | 2021-10-29 | 2022-01-14 | 惠科股份有限公司 | Display panel driver and display device |
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