CN107331354B - Electrophoretic display panel and its driving method and display device - Google Patents
Electrophoretic display panel and its driving method and display device Download PDFInfo
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- CN107331354B CN107331354B CN201710682358.0A CN201710682358A CN107331354B CN 107331354 B CN107331354 B CN 107331354B CN 201710682358 A CN201710682358 A CN 201710682358A CN 107331354 B CN107331354 B CN 107331354B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
Abstract
This application discloses a kind of electrophoretic display panel and its driving method and display devices.Electrophoretic display panel includes that controller, public electrode, multiple pixel electrodes and the electrocoating film between public electrode and pixel electrode, electrocoating film include electrophoretic particle；Controller is configured as: during reset, being applied first voltage to public electrode, is applied second voltage to each pixel electrode；Image address period, applies tertiary voltage to public electrode, applies the 4th voltage or second voltage to pixel electrode；Wherein, first voltage and tertiary voltage polarity on the contrary, second voltage and the 4th polarity of voltage on the contrary, first voltage is opposite with second voltage polarity.According to the scheme of the application, opposite polarity voltage signal is provided to public electrode and pixel electrode respectively by setting controller to, the voltage difference between the source-drain electrode of TFT is reduced, to reduce leakage current, improves the display effect of electrophoretic display panel.
Description
Technical field
Present application relates generally to field of display technology more particularly to a kind of electrophoretic display panel and its driving method and displays
Device.
Background technique
Electrophoresis showed is using in the electric field controls electrocoating film between two electrodes (for example, pixel electrode and public electrode)
Electrophoretic particle movement, by the position control of the electrophoretic particle after movement from the reflection of external incident light, to realize figure
As display.Due to unique advantages such as its extremely low power consumption, reduction paper visual sense and the reading of suitable human eye, electrophoresis showed skill
Art gradually causes the concern of people, especially at static status display field (such as, label, books, newspaper, billboard, nameplate etc.),
LCD (Liquid Crystal Display, liquid crystal display) and OLED (Organic Light Emitting will be become
Diode, Organic Light Emitting Diode) irreplaceable display technology.
Electrophoretic display apparatus generallys use thin film transistor (TFT) (Thin Film Transistor, TFT) and is driven, and
In order to realize high-resolution display effect, LTPS (Low Temperature Poly-silicon, low-temperature polysilicon are mostly used
Silicon) production TFT.However, since the driving voltage that electrophoretic display apparatus needs is larger, for example, ± 15V, when using LTPS-TFT
When driving, the voltage difference between the source-drain electrode of TFT is larger (for example, can reach 30V), larger so as to cause the leakage current of TFT,
Pixel voltage in storage cannot effectively be kept, and electrophoretic particle also can not just be moved to desired position, and then influence
The display effect of electrophoretic display apparatus.
Summary of the invention
In view of drawbacks described above in the prior art or deficiency, be intended to provide a kind of electrophoretic display panel and its driving method and
Display device, to solve the technical problems existing in the prior art.
According to the one aspect of the application, a kind of electrophoretic display panel is provided, including controller, public electrode, multiple
Pixel electrode and the electrocoating film between public electrode and pixel electrode, electrocoating film include electrophoretic particle；Controller is matched
It is set to: during reset, applying first voltage to public electrode, apply second voltage to each pixel electrode；Image address period, to
Public electrode applies tertiary voltage, applies the 4th voltage or second voltage to pixel electrode；Wherein, first voltage and tertiary voltage
Polarity on the contrary, second voltage and the 4th polarity of voltage on the contrary, first voltage is opposite with second voltage polarity；First voltage and second
The voltage absolute value of the difference of voltage is not less than the minimum driving voltage of electrophoretic particle, the voltage difference of tertiary voltage and the 4th voltage
Absolute value is not less than the minimum driving voltage of electrophoretic particle.
According to the another aspect of the application, a kind of driving method of electrophoretic display panel, electrophoretic display panel are additionally provided
Including controller, public electrode, multiple pixel electrodes and the electrocoating film between public electrode and pixel electrode, electrocoating film
Including electrophoretic particle；During driving method includes: reset, controller applies first voltage to public electrode, to each pixel electrode
Apply second voltage；Image address period, controller apply tertiary voltage to public electrode, apply the 4th voltage to pixel electrode
Or second voltage；Wherein, first voltage and tertiary voltage polarity on the contrary, second voltage and the 4th polarity of voltage on the contrary, first electricity
It presses opposite with second voltage polarity；The voltage absolute value of the difference of first voltage and second voltage is driven not less than the minimum of electrophoretic particle
The voltage absolute value of the difference of dynamic voltage, tertiary voltage and the 4th voltage is not less than the minimum driving voltage of electrophoretic particle.
According to the another aspect of the application, a kind of display device is additionally provided, including electrophoretic display panel as above.
Electrophoretic display panel and its driving method provided by the present application and display device, by the way that controller to be set as distinguishing
Opposite polarity voltage signal is provided to public electrode and pixel electrode, reduces the voltage difference between the source-drain electrode of TFT, thus
Leakage current is reduced, the display effect of electrophoretic display panel is improved.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon:
Figure 1A shows the schematic diagram of the electrophoretic display panel of the application one embodiment；
Figure 1B shows the schematic sectional view of electrophoretic display panel shown in figure 1A；
Fig. 2 shows the modularization design figures of controller in Figure 1A；
Fig. 3 shows the pixel circuit figure of Figure 1A illustrated embodiment；
Fig. 4 shows the operation schematic diagram of the electrophoretic display panel of timing according to Fig.2,；
Fig. 5 shows another modularization design figure of Figure 1A controller；
Fig. 6 shows the another modularization design figure of Figure 1A controller；
Fig. 7 shows the schematic diagram of the electrophoretic display panel of another embodiment of the application；
Fig. 8 shows the pixel circuit figure of an optional implementation of embodiment illustrated in fig. 7；
Fig. 9 shows the schematic flow chart of one embodiment of the driving method of the application electrophoretic display panel；
Figure 10 shows the timing diagram of driving method shown in Fig. 9；
Figure 11 shows the operation schematic diagram of the electrophoretic display panel of timing according to Fig.10,；
Figure 12 shows the schematic flow chart of another embodiment of the driving method of the application electrophoretic display panel；
Figure 13 shows the timing diagram of driving method shown in Figure 12；
Figure 14 shows the operation schematic diagram of the electrophoretic display panel of the timing according to shown in Figure 13；
Figure 15 shows the schematic diagram of one embodiment of the display device of the application.
Specific embodiment
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that in order to
Convenient for description, part relevant to invention is illustrated only in attached drawing.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Figure 1A shows the schematic diagram of the electrophoretic display panel of the application one embodiment, and Figure 1B shows shown in figure 1A
The schematic sectional view of electrophoretic display panel, Fig. 2 shows the modularization design figures of controller in Figure 1A.
As shown in Figure 1A, electrophoretic display panel may include controller 11 and display unit 12, and controller 11 may include that scanning is driven
Dynamic circuit 11a, data drive circuit 11b and timer 11c, display unit 12 may include by multiple data lines D1~DnIt is swept with a plurality of
Retouch line S1~SmThe multiple pixel P crossed each other to form.
As shown in Figure 1B, display unit 12 may include public electrode CE, multiple pixel electrode PE and be located at public electrode CE
Electrocoating film between pixel electrode PE, electrocoating film may include electrophoretic particle, for example, positively charged white particles MwWith it is negatively charged
Black particle Mb。
The movement of electrophoretic particle can be realized by electric field, that is to say, that electrophoretic particle can be according to public electrode CE and pixel
Electric field level and direction between electrode PE are correspondingly moved, for example, applying ground voltage to public electrode CE, and to picture
The data voltage of plain electrode PE application+15V, then positively charged white particles MwCan be mobile to public electrode CE, it is electronegative black
Color particle MbCan be mobile to pixel electrode PE, in this way, incident light is positively charged when exterior light is from public electrode CE side incidence
White particles MwReflection, so that pixel P, which can be observed, is presented white.
Controller 11 is used to generate the various signals of electrophoretic display panel needs, for example, being applied to the public affairs of public electrode CE
Common voltage is applied to pixel electrode PE (or data line D1~Dn) data voltage, be applied to scan line S1~SmScanning signal
Deng.
Specifically, as shown in Fig. 2, controller 11 is configured as:
During reset, apply first voltage V to public electrode CE1, to each pixel electrode PEa/PEbApply second voltage V2,
Here, pixel electrode PEaRefer to the pixel electrode of the pixel of image to be displayed (different from the color of background colour), pixel electrode PEbRefer to
Keep the pixel electrode of the pixel of background colour；
Image address period applies tertiary voltage V to public electrode CE3, to pixel electrode PEbApply second voltage V2, to
Pixel electrode PEaApply the 4th voltage V4。
Wherein, first voltage V1With tertiary voltage V3Polarity is on the contrary, second voltage V2With the 4th voltage V4Polarity is on the contrary, simultaneously
And first voltage V1With second voltage V2Polarity is opposite.
Meanwhile first voltage V1With second voltage V2Voltage absolute value of the difference not less than electrophoretic particle simulation electricity
Pressure, tertiary voltage V3With the 4th voltage V4Voltage absolute value of the difference be not less than electrophoretic particle minimum driving voltage.Here, most
Small driving voltage is to be applied to public electrode CE and pixel electrode PE required for instigating electrophoretic particle mobilea/PEbOn voltage difference
Absolute value minimum value, for example, 10V.
Illustrate the beneficial effect of the present embodiment below with reference to Fig. 3 and Fig. 4, Fig. 3 shows the picture of Figure 1A illustrated embodiment
Plain circuit diagram, Fig. 4 show the operation schematic diagram of the electrophoretic display panel of timing according to Fig.2,.
As shown in figure 3, in pixel circuit, the gate electrode and scan line S of thin film transistor (TFT) Tr1Connection, thin film transistor (TFT)
The source electrode and data line D of Tr1Connection, the drain electrode and pixel capacitor C of thin film transistor (TFT) TrepWith storage CstOne
A pole plate (i.e. pixel electrode PEa/PEb) connection, pixel capacitor CepWith storage CstAnother pole plate (i.e. common electrical
Pole CE) it is connect with public pressure wire COM.Wherein, data line D1Tie point with the source electrode of thin film transistor (TFT) Tr is first segment
Point N1, the tie point between the drain electrode and pixel electrode PE of thin film transistor (TFT) Tr is second node N2。
Controller 11 applies scanning signal to scan line S1, applies data voltage signal, thin film transistor (TFT) to data line D1
Tr is connected based on scanning signal, and data voltage signal is applied to second node N2, charges to storage Cst, and
The data voltage signal between two pole plates of pixel capacitor Cep is kept by storage Cst, to control electrophoretic particle
It is moved to corresponding position, realizes that picture is shown.
Specifically, as shown in figure 4, during reset, public electrode CE and pixel electrode PEa/PEbBetween generate reversed electricity
(field strength direction is from pixel electrode PE by Ea/PEbIt is directed toward public electrode CE), positively charged white particles MwIt is moved to public electrode
The side CE, electronegative black particle MbIt is moved to pixel electrode PEa/PEbWhite (i.e. background colour) is presented in side, each pixel.?
Image address period, public electrode CE and pixel electrode PEaBetween generate positive field E (field strength direction refers to from public electrode CE
To pixel electrode PEa), positively charged white particles MwIt is moved to pixel electrode PEaSide, electronegative black particle MbIt is mobile
To the side public electrode CE, pixel electrode PEaBlack (i.e. picture color) is presented in the pixel at place, and pixel electrode PEbWith common electrical
Electrophoretic particle between the CE of pole remains unchanged.
With driving voltage (public electrode CE and the pixel electrode PE of electrophoretic particlea/PEbBetween voltage absolute value of the difference)
For 15V, the voltage that public electrode CE is applied be a fixed voltage (such as 0V) in the case where, needed during reset to
Pixel electrode PEa/PEbThe data voltage of application+15V, image address period are then needed to pixel electrode PEaThe number of application -15V
According to voltage, that is to say, that controller 11 is needed to pixel electrode PEaThe data voltage that amplitude is 30V is provided.In this way when film crystalline substance
When body pipe Tr is in off state, first node N1With second node N2Between voltage difference also can reach 30V, such high voltage
The leakage current that difference will lead on thin film transistor (TFT) Tr is larger, such as can reach 10-11A or more greatly reduces storage Cst
Holding capacity influence to show quality so that electrophoretic particle can not be moved to expected position.
And in the present embodiment, controller 11 is configured as providing signal according to timing shown in Fig. 2.Still with electrophoretic particle
For driving voltage is 15V, during reset, since public electrode CE has been applied first voltage V1(for example, -5V), therefore to
Pixel electrode PEaThe second voltage V of application2Absolute value can be (15V- | V1|) (for example, 10V)；And image address period,
Since public electrode CE has been applied tertiary voltage V3(for example, 10V), therefore to pixel electrode PEaThe 4th voltage V applied4's
Absolute value can be (15V- | V3|) (for example, -5V).That is, controller 11 is needed to pixel electrode PEaThere is provided amplitude is
The data voltage of 15V.In this way when thin film transistor (TFT) Tr is in off state, first node N1With second node N2Between voltage
Difference can be only 15V, so that the leakage current of thin film transistor (TFT) Tr is effectively reduced, for example, less than 10-12A is even lower, improves storage
Capacitor CstHolding capacity, so that electrophoretic particle is moved to expected position, to mention high display quality.
In the present embodiment, apply opposite polarity electricity to public electrode and pixel electrode respectively by setting controller to
Pressure, reduces the voltage difference between the source-drain electrode of TFT, to reduce the leakage current of TFT, and then mentions high display quality.
Further, since reducing the data voltage being applied on pixel electrode PE, therefore also reduce electrophoretic display panel
Power consumption.
In addition, as shown in Figure 2, controller 11 is additionally configured to scan line Sa/SbApplication scanning pulse signal, and
Apply multiple scanning pulse signals to each scan line during reset, applies multiple scanning arteries and veins to each scan line during image is shown
Rush signal.Here, scan line SaControl and pixel electrode PEaThe thin film transistor (TFT) Tr of connection, scan line SbControl and pixel electrode
PEbThe thin film transistor (TFT) Tr of connection.During reset or image address period, scan line are repeatedly opened, so that reset signal
Or picture signal is fully entered and is finished.For example, during reset, controller 11 is to scan line Sa/SbRespectively apply 15 scanning arteries and veins
Rush signal, each pulse signal open stage, to pixel electrode PEaAnd PEbApply second voltage V2, on electrophoretic display panel
White particles MwIt is gradually moved into close to the side of public electrode CE.In image address period, controller 11 is to scan line SaApply
15 scanning pulse signals, each pulse signal open stage, to pixel electrode PEaApply the 4th voltage V4, complete 15 scanning
After pulse, pixel electrode PEaCorresponding pixel shows black.If controller 11 is to scan line S at this point, the time limit is written in imagea
Apply 15 scanning pulse signals, only in preceding 10 subpulse signal open stage, to pixel electrode PEaApply the 4th voltage V4, and
In rear 5 subpulse signal open stage, to pixel electrode PEaApply tertiary voltage V3(i.e. identical as public electrode voltages), then after
Five subpulse signal open stages, can't cause the movement of white particles or black particle, then finally display state is to be situated between
Grayscale between white and black is shown.It is additionally configured to hop controller 11 to scan line Sa/SbApply scanning pulse signal
Time with tertiary voltage or the 4th voltage and second voltage is inputted to pixel electrode, it is aobvious that different grayscale may be implemented
Show.
In other words, all pixels on electrophoretic display panel are resetted during reset, image address period is to electricity
Swimming display panel on institute it is in need show image pixel be written.
In this way, the present embodiment is to the institute on electrophoretic display panel for the reset of single pixel and image write-in
There is pixel to be operated, both reduced resetting time and image write time, in turn avoids data voltage on same data line and become
Change bring signal interference.
Although it includes positively charged white particles M that Figure 1B, which shows electrocoating film,wWith electronegative black particle Mb, but this is only
It is only schematic.Electrocoating film also may include the electrophoretic particle of other colors, for example, red particle, blue particulate, green particle
Deng, and the charge of the size of electrophoretic particle and institute's band can carry out various changes, and those skilled in the art can be according to reality
The needs of border scene are configured.
Although it is NMOS (Negative channel Metal Oxide that Fig. 3, which shows thin film transistor (TFT) Tr,
Semiconductor, N-channel metal-oxide semiconductor (MOS)) transistor, but this is only schematical.It is understood that thin
Film transistor Tr is also possible to PMOS (Positive channel Metal Oxide Semiconductor, P-channel metal oxygen
Compound semiconductor) transistor.
Although Fig. 4 shows image address period public electrode CE and pixel electrode PEbBetween electric field strength be 0, that is,
Second voltage V2With tertiary voltage V3It is equal, but this is only schematical.It will be understood by those skilled in the art that image is written
Period public electrode CE and pixel electrode PEbBetween electric field strength can not be 0, as long as second voltage V2With tertiary voltage V3
Between voltage absolute value of the difference be less than electrophoretic particle minimum driving voltage.
It will be understood by those skilled in the art that the electrophoretic display panel of the present embodiment can also include some other known
Structure, for example, underlay substrate SUB and protective layer PL etc..In order not to obscure the emphasis of the application, will no longer be tied to well known to these
Structure is described in detail.
While figure 2 show that tertiary voltage V3Amplitude be greater than first voltage V1Amplitude, the 4th voltage V4Amplitude be greater than
Second voltage V2Amplitude, but the application is not limited to this.
Optionally, first voltage and tertiary voltage amplitude are equal, and second voltage and the 4th voltage magnitude are equal.
With specific reference to Fig. 5, another modularization design figure of Figure 1A controller is shown.As shown in figure 5, first voltage V1With
Three voltage V3Amplitude is equal, second voltage V2With the 4th voltage V4Amplitude is equal.For example, first voltage V1For -5V, tertiary voltage V3
For 5V, second voltage V2For 10V, the 4th voltage V4For -10V.
Optionally, first voltage is equal with second voltage amplitude.
With specific reference to Fig. 6, the another modularization design figure of Figure 1A controller is shown.As shown in fig. 6, first voltage V1With
Three voltage V3Amplitude is equal, second voltage V2With the 4th voltage V4Amplitude is equal, and first voltage V1With second voltage V2Amplitude
It is equal.For example, first voltage V1For -7.5V, tertiary voltage V3For 7.5V, second voltage V2For 7.5V, the 4th voltage V4For-
7.5V。
With continued reference to Fig. 7, the schematic diagram of the electrophoretic display panel of another embodiment of the application is shown.
Similar with embodiment shown in figure 1A, in the present embodiment, electrophoretic display panel equally may include that controller (does not show
Out), public electrode CE, multiple pixel electrode PE and electrocoating film EPL, controller is also configured to during reset/and image writes
Apply opposite polarity data voltage to public electrode CE and pixel electrode PE respectively during entering.
Unlike embodiment shown in figure 1A, in the present embodiment, further limit has been carried out to electrophoretic display panel
It is fixed.
Specifically, as shown in fig. 7, electrophoretic display panel may also include the thin film transistor (TFT) being arranged on underlay substrate SUB
Tr, the voltage for providing controller is (for example, second voltage V shown in Fig. 22With the 4th voltage V4) it is transmitted to pixel electrode
PE.Thin film transistor (TFT) Tr may include gate electrode GE, source electrode SE, drain electrode DE and the active layer ACT with channel region, active layer
The material of ACT may include low temperature polycrystalline silicon (Low Temperature Poly-Silicon, LTPS).
Compared to amorphous silicon (Amorphous-Silicon, a-Si) thin film transistor (TFT), low-temperature polysilicon film transistor can
Realize higher resolution, and since its carrier mobility is high (e.g., about 300 times of amorphous silicon), also have compared with
Good charge characteristic.
Due to the common voltage on public electrode CE with the data voltage polarity on pixel electrode PE on the contrary, being therefore applied to
Data voltage on thin film transistor (TFT) Tr is (for example, first voltage V shown in Fig. 21With tertiary voltage V3) amplitude is smaller, effectively press down
The increase of leakage current processed, to ensure that the display quality of electrophoretic display panel.
In the present embodiment, by setting low-temperature polysilicon film transistor for thin film transistor (TFT), high solution is helped to realize
The electrophoretic display panel of analysis degree, and since controller is arranged to opposite to public electrode and pixel electrode offer polarity respectively
Voltage, reduce leakage current, improve display quality.
In addition, electrophoretic display panel may also include shading metal wire LS, shading metal wire LS covers thin film transistor (TFT) Tr's
Active layer ACT, for stopping external incident light to be incident on active layer ACT, so as to further decrease leakage current.
In the electrophoretic display panel of the various embodiments described above, pixel electrode is connect by a thin film transistor (TFT) with controller,
But the application is not limited to this.
Optionally, pixel electrode is connect by two thin film transistor (TFT)s with controller.
Specifically, thin film transistor (TFT) Tr may include first film transistor Tr1 and the second thin film transistor (TFT) Tr2, first
The source electrode of thin film transistor (TFT) Tr1 is connected to controller by data line, the drain electrode of the second thin film transistor (TFT) Tr1 and second thin
The source electrode of film transistor Tr2 connects, and the drain electrode of the second thin film transistor (TFT) Tr2 is connect (for example, by connecing with pixel electrode PE
Contact hole).
Illustrate the usefulness that two thin film transistor (TFT)s are set below with reference to Fig. 8, Fig. 8 shows embodiment illustrated in fig. 7
An optional implementation pixel circuit figure.
As shown in figure 8, pixel electrode PE passes through first film transistor Tr1 and the second thin film transistor (TFT) Tr2 and controller
Connection, first node N1With second node N2Between voltage difference by first film transistor Tr1 and the second thin film transistor (TFT) Tr2
It shares, i.e. first node N1With second node N2Between voltage difference be equal to first node N1With third node N3Between voltage
Difference and third node N3The sum of voltage difference between second node N2.
In other words, by the way that two thin film transistor (TFT)s are arranged, so that the electricity between the source-drain electrode of each thin film transistor (TFT)
Pressure difference further decreases, to further reduced the leakage current of thin film transistor (TFT), improves the display matter of electrophoretic display panel
Amount.
Optionally, first film transistor Tr1 and the second thin film transistor (TFT) Tr2 can be incorporated in together.
Specifically, the drain electrode of first film transistor Tr1 is multiplexed with the source electrode of the second thin film transistor (TFT) Tr2, and
The connection of the gate electrode of the gate electrode of first film transistor Tr1 and the second thin film transistor (TFT) Tr2, in other words, thin film transistor (TFT)
Tr is double-gate film transistor.
By setting double-gate film transistor for thin film transistor (TFT), leakage current can be not only reduced, moreover it is possible to reduce film
Chip area shared by transistor.
In addition, disclosed herein as well is a kind of driving methods of electrophoretic display panel, for driving the various embodiments described above
Electrophoretic display panel.
Fig. 9 shows the schematic flow chart of one embodiment of the driving method of the application electrophoretic display panel.
As shown in figure 9, driving method includes:
Step 910, during reset, controller applies first voltage to public electrode, applies the second electricity to each pixel electrode
Pressure.
Step 920, image address period, controller apply tertiary voltage to public electrode, apply the 4th to pixel electrode
Voltage or second voltage.
Wherein, first voltage and tertiary voltage polarity on the contrary, second voltage and the 4th polarity of voltage on the contrary, first voltage and
Second voltage polarity is on the contrary, the voltage absolute value of the difference of first voltage and second voltage is electric not less than the simulation of electrophoretic particle
The voltage absolute value of the difference of pressure, tertiary voltage and the 4th voltage is not less than the minimum driving voltage of electrophoretic particle.
In the present embodiment, by above-mentioned driving method, the voltage difference between the source-drain electrode of TFT is reduced, to make electrophoresis
Display panel has lower leakage current and higher display quality.
When by the driving method of the electrophoretic display panel of the present embodiment be applied to the application electrophoretic display panel (for example,
Figure 1A and electrophoretic display panel shown in Fig. 7) when, step 910~step 920 timing diagram can refer to Fig. 2, Fig. 5 and Fig. 6 institute
Show.
Fig. 2, Fig. 5 and Fig. 6 show driving method when electrophoretic display panel is white background color, below in conjunction with Figure 10
Driving method when electrophoretic display panel is black background color is described with Figure 11.Figure 10 shows driving method shown in Fig. 9
Timing diagram, Figure 11 shows the operation schematic diagram of the electrophoretic display panel of timing according to Fig.10,.
As shown in Figure 10 and Figure 11, during reset, controller applies the first voltage V of positive polarity to public electrode CE1, to
Pixel electrode PEa/PEbApply the second voltage V of negative polarity2, thus in public electrode CE and pixel electrode PEa/PEbBetween formed
Pixel electrode PE is directed toward from public electrode CE in the direction of reversed electric field E, reversed electric field Ea/PEb, under the action of electric field force, band is just
The white particles M of electricitywIt is moved to pixel electrode PEa/PEbSide, electronegative black particle MbIt is moved to public electrode CE mono-
Black (i.e. background colour) is presented in side, each pixel.Here, pixel electrode PEaFor the pixel electrode of the pixel of image to be displayed, pixel
Electrode PEbFor the pixel electrode of the pixel of holding background colour.
During image is shown, controller applies the tertiary voltage V of negative polarity to public electrode CE3, to pixel electrode PEaIt applies
Add the 4th voltage V of positive polarity4, to pixel electrode PEbApply the second voltage V of negative polarity2, thus in public electrode CE and picture
Plain electrode PEaBetween form positive field E, the direction of positive field E is from pixel electrode PEaIt is directed toward public electrode CE, in electric field force
Under the action of, positively charged white particles MwIt is moved to the side public electrode CE, electronegative black particle MbIt is moved to pixel electricity
Pole PEaSide, pixel electrode PEaBlack (i.e. picture color) is presented in the pixel at place, and public electrode CE and pixel electrode PEbIt
Between electrophoretic particle remain unchanged.
Optionally, first voltage and tertiary voltage amplitude are equal, and second voltage and the 4th voltage magnitude are equal.
For example, first voltage V1For -5V, tertiary voltage V3For 5V, second voltage V2For 10V, the 4th voltage V4For -10V.
Optionally, first voltage and tertiary voltage amplitude are equal, and second voltage and the 4th voltage magnitude are equal, first voltage
It is equal with second voltage amplitude.
For example, first voltage V1For -7.5V, tertiary voltage V3For 7.5V, second voltage V2For 7.5V, the 4th voltage V4For-
7.5V。
2 are continued to refer to figure 1, the schematic stream of another embodiment of the driving method of the application electrophoretic display panel is shown
Cheng Tu.
As shown in figure 12, image address period includes the first image address period and the second image address period, driving side
Method includes:
Step 1210, during reset, controller applies first voltage to public electrode, applies the second electricity to each pixel electrode
Pressure.
Step 1220, the first image address period, controller applies tertiary voltage to public electrode, to gray scale to be shown
The pixel electrode of pixel applies the 4th voltage.
Step 1230, the second image address period, controller apply second to the pixel electrode of the pixel of gray scale to be shown
Voltage, public electrode keep tertiary voltage.
The driving method of the present embodiment is described in detail below in conjunction with Figure 13 and Figure 14.Figure 13 shows drive shown in Figure 12
The timing diagram of dynamic method, Figure 14 show the operation schematic diagram of the electrophoretic display panel of the timing according to shown in Figure 13.
As shown in Figure 13 and Figure 14, during reset, controller applies first voltage V to public electrode CE1, to pixel electrode
PEa/PEb/PEcApply second voltage V2, thus in public electrode CE and pixel electrode PEa/PEb/PEcBetween form reversed electric field
Pixel electrode PE is directed toward from public electrode CE in the direction of E, reversed electric field Ea/PEb/PEc, under the action of electric field force, positively charged
White particles MwIt is moved to pixel electrode PEa/PEb/PEcSide, electronegative black particle MbIt is moved to the side public electrode CE,
Black (i.e. background colour) is presented in each pixel.Here, pixel electrode PEaFor the pixel electrode of the pixel of image to be displayed, pixel electricity
Pole PEbFor the pixel electrode of the pixel of holding background colour, pixel electrode PEcFor the pixel electrode of the pixel of grayscale to be shown.
During first image is shown, controller applies tertiary voltage V to public electrode CE3, to pixel electrode PEaAnd PEcIt applies
Add the 4th voltage V4, to pixel electrode PEbApply second voltage V2, thus in public electrode CE and pixel electrode PEaBetween formed
Positive field E, and in public electrode CE and pixel electrode PEcBetween form positive field E, the direction of positive field E is from picture
Plain electrode PEa/PEcIt is directed toward public electrode CE, under the action of electric field force, positively charged white particles MwFrom pixel electrode PEa/
PEcIt is moved to pixel electrode PEa/PEcRegion (for example, intermediate region) between public electrode CE, electronegative black particle
MbPixel electrode PE is moved to from public electrode CEa/PEcRegion (for example, intermediate region) between public electrode CE, it is external
Incident light is by white particles MwWith black particle MbReflection, pixel electrode PEa/PEcGrayscale is presented in the pixel at place, and pixel is electric
Pole PEbElectrophoretic particle between public electrode CE remains unchanged.
During second image is shown, controller is to pixel electrode PEaApply the 4th voltage V4, to pixel electrode PEbAnd PEc
Apply second voltage V2, public electrode CE holding tertiary voltage V3, thus in public electrode CE and pixel electrode PEaBetween formed
The direction of positive field E, positive field E are from pixel electrode PEaIt is directed toward public electrode CE, it is under the action of electric field force, positively charged
White particles MwContinue from pixel electrode PEaRegion (for example, intermediate region) between public electrode CE is moved to common electrical
The pole side CE, electronegative black particle MbContinue from pixel electrode PEaRegion between public electrode CE is (for example, middle area
Domain) it is moved to pixel electrode PEaSide, pixel electrode PEaThe pixel presentation white at place, and pixel electrode PEbWith public electrode
Electrophoretic particle and pixel electrode PE between CEcElectrophoretic particle between public electrode CE remains unchanged.
By above-mentioned driving method, electrophoretic display panel realizes that grayscale is shown.
Disclosed herein as well is a kind of display devices, as shown in Figure 15.Wherein, display device 1500 may include as above
Electrophoretic display panel.It will be appreciated by those skilled in the art that display device other than including electrophoretic display panel as above, is gone back
It may include some other well known structures.In order not to obscure the emphasis of the application, will no longer to structure well known to these into
Row further describes.
The display device of the application can be any device comprising electrophoretic display panel as above, including but not limited to such as
Electronic Paper 1500 shown in figure 15, e-book, billboard, applied in intelligent wearable device display, be applied to automobile etc.
Display device on the vehicles etc..As long as display device contains the structure of electrophoretic display panel disclosed in the present application, just
It has been contemplated as falling within the protection scope of the application.
Electrophoretic display panel and its driving method provided by the present application and display device, electrophoretic display panel is during operation
Applying opposite polarity voltage signal to public electrode and pixel electrode respectively, the voltage difference between the source-drain electrode of TFT is lower, because
This electrophoretic display panel has lower leakage current and preferable display effect.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art
Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Any combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed herein
Can technical characteristic replaced mutually and the technical solution that is formed.
Claims (11)
1. a kind of electrophoretic display panel, which is characterized in that including controller, public electrode, multiple pixel electrodes and be located at institute
The electrocoating film between public electrode and the pixel electrode is stated, the electrocoating film includes electrophoretic particle；
The controller is configured as:
During reset, Xiang Suoshu public electrode applies first voltage, applies second voltage to each pixel electrode；
Image address period includes the first image address period and the second image address period；
The first image address period, Xiang Suoshu public electrode applies tertiary voltage, described in the pixel to image to be displayed
Pixel electrode applies the 4th voltage, applies the second voltage to the pixel electrode for the pixel for keeping background colour, to aobvious
Show that the pixel electrode of the pixel of gray scale applies the 4th voltage；
The pixel electrode of the second image address period, the pixel of the image to be displayed keeps the 4th voltage,
The pixel electrode of the pixel for keeping background colour keeps the second voltage, to the picture of the pixel of gray scale to be shown
Plain electrode applies the second voltage, and the public electrode keeps the tertiary voltage；
Wherein, the first voltage and the tertiary voltage polarity are on the contrary, the second voltage and the 4th polarity of voltage phase
Instead, the first voltage is opposite with the second voltage polarity；
Simulation electricity of the voltage absolute value of the difference of the first voltage and the second voltage not less than the electrophoretic particle
Simulation electricity of the voltage absolute value of the difference of pressure, the tertiary voltage and the 4th voltage not less than the electrophoretic particle
Pressure.
2. electrophoretic display panel according to claim 1, which is characterized in that the first voltage and the tertiary voltage width
It is worth equal, the second voltage and the 4th voltage magnitude are equal.
3. electrophoretic display panel according to claim 2, which is characterized in that the first voltage and the second voltage width
It is worth equal.
4. electrophoretic display panel according to claim 1, which is characterized in that the electrophoretic display panel further includes multiple thin
Film transistor, for the second voltage or the 4th voltage to be transmitted to the pixel electrode.
5. electrophoretic display panel according to claim 4, which is characterized in that the thin film transistor (TFT) is that low temperature polycrystalline silicon is thin
Film transistor.
6. electrophoretic display panel according to claim 4, which is characterized in that the pixel electrode passes through two films
Transistor is connect with the controller.
7. electrophoretic display panel according to claim 4, which is characterized in that the thin film transistor (TFT) is that double-gate film is brilliant
Body pipe.
8. a kind of driving method of electrophoretic display panel, which is characterized in that the electrophoretic display panel includes controller, common electrical
Pole, multiple pixel electrodes and the electrocoating film between the public electrode and the pixel electrode, the electrocoating film include
Electrophoretic particle；
The driving method includes:
During reset, the controller applies first voltage to the public electrode, applies the second electricity to each pixel electrode
Pressure；
Image address period, described image address period include the first image address period and the second image address period；
The first image address period, the controller applies tertiary voltage to the public electrode, to image to be displayed
The pixel electrode of pixel applies the 4th voltage, applies second electricity to the pixel electrode for the pixel for keeping background colour
Pressure applies the 4th voltage to the pixel electrode of the pixel of gray scale to be shown；
The second image address period, the controller apply institute to the pixel electrode of the pixel of the image to be displayed
The 4th voltage is stated, applies the second voltage to the pixel electrode of the pixel for keeping background colour, to described to be shown
The pixel electrode of the pixel of gray scale applies the second voltage, and the public electrode keeps the tertiary voltage；
Wherein, the first voltage and the tertiary voltage polarity are on the contrary, the second voltage and the 4th polarity of voltage phase
Instead, the first voltage is opposite with the second voltage polarity；
Simulation electricity of the voltage absolute value of the difference of the first voltage and the second voltage not less than the electrophoretic particle
Simulation electricity of the voltage absolute value of the difference of pressure, the tertiary voltage and the 4th voltage not less than the electrophoretic particle
Pressure.
9. driving method according to claim 8, which is characterized in that the first voltage and the tertiary voltage amplitude phase
Deng the second voltage and the 4th voltage magnitude are equal.
10. driving method according to claim 9, which is characterized in that the first voltage and the second voltage amplitude
It is equal.
11. a kind of display device, which is characterized in that including such as described in any item display panels of claim 1-10.
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| JP5071014B2 (en) * | 2007-09-13 | 2012-11-14 | セイコーエプソン株式会社 | Electrophoretic display device driving method, electrophoretic display device, and electronic apparatus |
| JP5019177B2 (en) * | 2007-10-16 | 2012-09-05 | セイコーエプソン株式会社 | Electrophoretic display device, electronic apparatus, and driving method of electrophoretic display device |
| JP4623107B2 (en) * | 2008-02-21 | 2011-02-02 | セイコーエプソン株式会社 | Electrophoretic display device and method of manufacturing electrophoretic display device |
| KR101577220B1 (en) * | 2008-12-17 | 2015-12-28 | 엘지디스플레이 주식회사 | Electrophoresis display and driving method thereof |
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| JP5601470B2 (en) * | 2010-12-01 | 2014-10-08 | セイコーエプソン株式会社 | Electrophoretic display device driving method, electrophoretic display device, and electronic apparatus |
| CN102654980B (en) * | 2012-01-09 | 2015-01-14 | 京东方科技集团股份有限公司 | Electronic paper display device and driving method thereof |
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