CN107331354A - 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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- CN107331354A CN107331354A CN201710682358.0A CN201710682358A CN107331354A CN 107331354 A CN107331354 A CN 107331354A CN 201710682358 A CN201710682358 A CN 201710682358A CN 107331354 A CN107331354 A CN 107331354A
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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
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Abstract
This application discloses a kind of electrophoretic display panel and its driving method and display device.Electrophoretic display panel includes controller, public electrode, multiple pixel electrodes and the electrocoating film between public electrode and pixel electrode, and electrocoating film includes electrophoretic particle；Controller is configured as：During reset, first voltage is applied to public electrode, second voltage is applied to each pixel electrode；Image address period, tertiary voltage is applied to public electrode, and the 4th voltage or second voltage are applied to pixel electrode；Wherein, first voltage and tertiary voltage opposite polarity, second voltage and the 4th polarity of voltage are on the contrary, first voltage and second voltage opposite polarity.According to the scheme of the application, by being set to controller to provide opposite polarity voltage signal to public electrode and pixel electrode respectively, the voltage difference between TFT source-drain electrode is reduced, so as to reduce leakage current, the display effect of electrophoretic display panel is improved.
Description
Technical field
Present application relates generally to display technology field, more particularly to a kind of electrophoretic display panel and its driving method and display
Device.
Background technology
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 control of the position of the electrophoretic particle after movement from the reflection of external incident light, so as to realize figure
As display.Due to unique advantages, electrophoresis showed skill such as its extremely low power consumption, reduction paper visual sense and the readings of suitable human eye
Art gradually causes the concern of people, especially at static state display field (such as, label, books, newspaper, billboard, nameplate etc.),
LCD (Liquid Crystal Display, liquid crystal display) and OLED (Organic Light Emitting will be turned into
Diode, Organic Light Emitting Diode) irreplaceable Display Technique.
Electrophoretic display apparatus is generally driven using thin film transistor (TFT) (Thin Film Transistor, TFT), and
In order to realize high-resolution display effect, more using LTPS (Low Temperature Poly-silicon, low-temperature polysilicon
Silicon) make TFT.However, because the driving voltage that electrophoretic display apparatus needs is larger, for example, ± 15V, when using LTPS-TFT
During driving, the voltage difference between TFT source-drain electrode is larger (for example, can reach 30V), so that cause TFT leakage current larger,
Pixel voltage in storage can not 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.
The content of the invention
In view of drawbacks described above of the prior art or deficiency, expect to provide a kind of electrophoretic display panel and its driving method and
Display device, to solve technical problem present in prior art.
According to the one side of the application there is provided a kind of electrophoretic display panel, including it is controller, public electrode, multiple
Pixel electrode and the electrocoating film between public electrode and pixel electrode, electrocoating film include electrophoretic particle；Controller by with
It is set to：During reset, first voltage is applied to public electrode, second voltage is applied to each pixel electrode；Image address period, to
Public electrode applies tertiary voltage, and the 4th voltage or second voltage are applied to pixel electrode；Wherein, first voltage and tertiary voltage
Opposite polarity, second voltage and the 4th polarity of voltage are on the contrary, first voltage and second voltage opposite polarity；First voltage and second
The absolute value of the voltage 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；Driving method includes：During reset, controller applies first voltage to public electrode, to each pixel electrode
Apply second voltage；Image address period, controller applies tertiary voltage to public electrode, and the 4th voltage is applied to pixel electrode
Or second voltage；Wherein, first voltage and tertiary voltage opposite polarity, second voltage and the 4th polarity of voltage are on the contrary, the first electricity
Pressure and second voltage opposite polarity；Minimum drive of the absolute value of the voltage difference of first voltage and second voltage not less than electrophoretic particle
The absolute value of the voltage 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, including electrophoretic display panel as above are additionally provided.
Electrophoretic display panel and its driving method and display device that the application is provided, by the way that controller is set into difference
Opposite polarity voltage signal is provided to public electrode and pixel electrode, the voltage difference between TFT source-drain electrode is reduced, so that
Leakage current is reduced, the display effect of electrophoretic display panel is improved.
Brief description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, 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 the electrophoretic display panel shown in Figure 1A；
Fig. 2 shows the modularization design figure of controller in Figure 1A；
Fig. 3 shows the image element circuit figure of Figure 1A illustrated embodiments；
Fig. 4 shows the operating diagram of the electrophoretic display panel of the sequential according to Fig. 2；
Fig. 5 shows another modularization design figure of Figure 1A controllers；
Fig. 6 shows the another modularization design figure of Figure 1A controllers；
Fig. 7 shows the schematic diagram of the electrophoretic display panel of another embodiment of the application；
Fig. 8 shows the image element circuit figure of an optional implementation of embodiment illustrated in fig. 7；
Fig. 9 shows the indicative flowchart of one embodiment of the driving method of the application electrophoretic display panel；
Figure 10 shows the timing diagram of the driving method shown in Fig. 9；
Figure 11 shows the operating diagram of the electrophoretic display panel of the sequential according to Figure 10；
Figure 12 shows the indicative flowchart of another embodiment of the driving method of the application electrophoretic display panel；
Figure 13 shows the timing diagram of the driving method shown in Figure 12；
Figure 14 shows the operating diagram of the electrophoretic display panel of the sequential according to Figure 13；
Figure 15 shows the schematic diagram of one embodiment of the display device of the application.
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
It is easy to illustrate only the part related to invention in description, accompanying drawing.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the application 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 is shown shown in Figure 1A
The schematic sectional view of electrophoretic display panel, Fig. 2 shows the modularization design figure of controller in Figure 1A.
As shown in Figure 1A, electrophoretic display panel may include controller 11 and display part 12, and controller 11 may include that scanning is driven
Dynamic circuit 11a, data drive circuit 11b and timer 11c, display part 12 may include by a plurality of data lines D1~DnSwept with a plurality of
Retouch line S1~SmThe multiple pixel P crossed each other to form.
As shown in Figure 1B, display part 12 may include public electrode CE, multiple pixel electrode PE and positioned at public electrode CE
Electrocoating film between pixel electrode PE, electrocoating film may include electrophoretic particle, for example, the white particles M of positively chargedwWith 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, apply ground voltage to public electrode CE, and to picture
The white particles M of plain electrode PE applications+15V data voltage, then positively chargedwIt can be moved to public electrode CE, it is electronegative black
Color particulate MbIt can be moved to pixel electrode PE, so, when exterior light is incident from public electrode CE sides, incident light is by positively charged
White particles MwReflection, so that pixel P, which can be observed, is presented white.
Controller 11 is used for the various signals for generating electrophoretic display panel needs, for example, being applied to public electrode CE public affairs
Common voltage, it is applied to pixel electrode PE (or data wire 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, first voltage V is applied 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 (color for being different from background colour), pixel electrode PEbRefer to
Keep the pixel electrode of the pixel of background colour；
Image address period, tertiary voltage V is applied 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 V3Opposite polarity, second voltage V2With the 4th voltage V4Opposite polarity, and
And first voltage V1With second voltage V2Opposite polarity.
Meanwhile, first voltage V1With second voltage V2Voltage difference absolute value not less than electrophoretic particle simulation electricity
Pressure, tertiary voltage V3With the 4th voltage V4Voltage difference absolute value be not less than electrophoretic particle minimum driving voltage.Here, most
Small driving voltage is to instigate electrophoretic particle to be applied to public electrode CE and pixel electrode PE required for movinga/PEbOn voltage difference
Absolute value minimum value, for example, 10V.
Illustrate the beneficial effect of the present embodiment with reference to Fig. 3 and Fig. 4, Fig. 3 shows the picture of Figure 1A illustrated embodiments
Plain circuit diagram, Fig. 4 shows the operating diagram of the electrophoretic display panel of the sequential according to Fig. 2.
As shown in figure 3, in image element circuit, thin film transistor (TFT) Tr gate electrode and scan line S1Connection, thin film transistor (TFT)
Tr source electrode and data wire D1Connection, thin film transistor (TFT) Tr drain electrode and pixel capacitor CepWith storage CstOne
Individual pole plate (i.e. pixel electrode PEa/PEb) connection, pixel capacitor CepWith storage CstAnother pole plate (i.e. common electrical
Pole CE) it is connected with public pressure wire COM.Wherein, data wire D1Tie point with thin film transistor (TFT) Tr source electrode is first segment
Point N1, the tie point between thin film transistor (TFT) Tr drain electrode and pixel electrode PE is Section Point N2。
Controller 11 applies scanning signal to scan line S1, and data voltage signal, thin film transistor (TFT) are applied to data wire D1
Tr is turned on based on scanning signal, and data voltage signal is applied to Section Point N2, storage Cst is charged, and
Data voltage signal between two pole plates for keeping pixel capacitor Cep by storage Cst, so as to control electrophoretic particle
Corresponding position is moved to, realizes that picture is shown.
Specifically, as shown in figure 4, during resetting, public electrode CE and pixel electrode PEa/PEbBetween produce reversely electricity
(field strength direction is from pixel electrode PE by Ea/PEbPoint to public electrode CE), the white particles M of positively chargedwIt is moved to public electrode
CE sides, electronegative black particle MbIt is moved to pixel electrode PEa/PEbSide, each pixel is presented white (i.e. background colour).
Image address period, public electrode CE and pixel electrode PEaBetween produce positive field E (field strength direction refer to from public electrode CE
To pixel electrode PEa), the white particles M of positively chargedwIt is moved to pixel electrode PEaSide, electronegative black particle MbIt is mobile
To public electrode CE sides, pixel electrode PEaThe pixel presentation black (i.e. picture color) at place, and pixel electrode PEbWith common electrical
Electrophoretic particle between the CE of pole keeps constant.
With driving voltage (the public electrode CE and pixel electrode PE of electrophoretic particlea/PEbBetween voltage difference absolute value)
Exemplified by 15V, the voltage that public electrode CE is applied in be a fixed voltage (such as 0V) in the case of, needed during reset to
Pixel electrode PEa/PEbApplication+15V data voltage, image address period is then needed to pixel electrode PEaApplication -15V number
According to voltage, that is to say, that controller 11 is needed to pixel electrode PEaThe data voltage that amplitude is 30V is provided.So when film is brilliant
When body pipe Tr is in cut-off state, first node N1With Section Point N2Between voltage difference also can reach 30V, such high voltage
Difference can cause the leakage current on thin film transistor (TFT) Tr larger, for example, can reach 10-11More than A, greatly reduces storage Cst
Holding capacity so that electrophoretic particle can not be moved to expected position, influence display quality.
And in the present embodiment, controller 11 is configured as providing signal according to the sequential shown in Fig. 2.Still with electrophoretic particle
Driving voltage be 15V exemplified by, during reset, because public electrode CE has been applied in 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,
Because public electrode CE has been applied in 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
15V data voltage.So when thin film transistor (TFT) Tr is in cut-off state, first node N1With Section Point N2Between voltage
Difference can be only 15V, so that effectively reduction thin film transistor (TFT) Tr leakage current, for example, less than 10-12A is even lower, improves storage
Capacitor CstHolding capacity, electrophoretic particle is moved to expected position, so as to improve display quality.
In the present embodiment, by the way that controller is set to apply opposite polarity electricity to public electrode and pixel electrode respectively
Pressure, reduces the voltage difference between TFT source-drain electrode, so as to reduce TFT leakage current, and then improves 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, multiple scanning arteries and veins are applied 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 resetting, or image address period, scan line is repeatedly opened, so that reset signal
Or picture signal is fully entered and finished.For example, during resetting, controller 11 is to scan line Sa/SbIt is each to 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 public electrode CE side.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 now, writing the time limit in image, controller 11 is to scan line Sa
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 with public electrode voltages), then after
Five subpulse signal open stages, can't cause the movement of white particles or black particle, then final dispaly state is Jie
GTG between white and black is shown.It is additionally configured to hop controller 11 to scan line Sa/SbApply scanning pulse signal
Time with inputting tertiary voltage or the 4th voltage and from second voltage to pixel electrode, it is possible to achieve different GTGs shows
Show.
In other words, all pixels on electrophoretic display panel are resetted during reset, image address period is to electricity
On swimming display panel the pixel of display image in need write.
So, for the reset of single pixel and image write-in, the present embodiment is to the institute on electrophoretic display panel
There is pixel to be operated, both reduced resetting time and image write time, turn avoid data voltage on same data wire and become
Change the signal interference brought.
Although Figure 1B shows that electrocoating film includes the white particles M of positively chargedwWith electronegative black particle Mb, but this is only
Only it is schematic.Electrocoating film can also include the electrophoretic particle of other colors, for example, red particulate, blue particulate, green particulate
Deng, and the size of electrophoretic particle and the electric charge of institute's band can carry out various changes, and those skilled in the art can be according to reality
It is configured the need for the scene of border.
Although Fig. 3 shows that thin film transistor (TFT) Tr is NMOS (Negative channel Metal Oxide
Semiconductor, N-channel metal-oxide semiconductor (MOS)) transistor, but this is only schematical.It is understood that thin
Film transistor Tr can also be 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 intensity be 0, i.e.
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 writes
Period public electrode CE and pixel electrode PEbBetween electric-field intensity can not be 0, as long as second voltage V2With tertiary voltage V3
Between voltage difference absolute value 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 be including some other known
Structure, for example, underlay substrate SUB and protective layer PL etc.., will be no longer to these known knots in order to not obscure the emphasis of the application
Structure is described in detail.
While figure 2 show that tertiary voltage V3Amplitude be more than first voltage V1Amplitude, the 4th voltage V4Amplitude be more than
Second voltage V2Amplitude, but the application is not limited to this.
Alternatively, 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 controllers 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.
Alternatively, first voltage is equal with second voltage amplitude.
With specific reference to Fig. 6, the another modularization design figure of Figure 1A controllers 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 the embodiment shown in Figure 1A, in the present embodiment, electrophoretic display panel equally may include that controller (does not show
Go out), public electrode CE, multiple pixel electrode PE and electrocoating film EPL, controller is also configured to during resetting/image writes
Apply opposite polarity data voltage to public electrode CE and pixel electrode PE respectively during entering.
From unlike the 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, for the voltage that provides controller (for example, the second voltage V shown in Fig. 22With the 4th voltage V4) it is delivered 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
ACT material may include low temperature polycrystalline silicon (Low Temperature Poly-Silicon, LTPS).
Compared to non-crystalline silicon (Amorphous-Silicon, a-Si) thin film transistor (TFT), low-temperature polysilicon film transistor can
Realize higher resolution, and because its carrier mobility is high (e.g., about 300 times of non-crystalline silicon), thus also have compared with
Good charge characteristic.
Due to the data voltage opposite polarity on the common electric voltage on public electrode CE and pixel electrode PE, therefore it is applied to
Data voltage on thin film transistor (TFT) Tr is (for example, the first voltage V shown in Fig. 21With tertiary voltage V3) amplitude is smaller, effectively suppression
The increase of leakage current processed, so as to ensure that the display quality of electrophoretic display panel.
In the present embodiment, by the way that thin film transistor (TFT) is set into low-temperature polysilicon film transistor, help to realize high solution
The electrophoretic display panel of analysis degree, and because controller is arranged to provide opposite polarity to public electrode and pixel electrode respectively
Voltage, reduce leakage current, improve display quality.
In addition, electrophoretic display panel may also include shading metal wire LS, shading metal wire LS cover film transistors Tr's
Active layer ACT, for stopping that external incident light incides active layer ACT, so as to further reduction leakage current.
In the electrophoretic display panel of the various embodiments described above, pixel electrode is connected by a thin film transistor (TFT) with controller,
But the application is not limited to this.
Alternatively, pixel electrode is connected 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
Thin film transistor (TFT) Tr1 source electrode is connected to controller by data wire, the second thin film transistor (TFT) Tr1 drain electrode and second thin
Film transistor Tr2 source electrode connection, the second thin film transistor (TFT) Tr2 drain electrode is connected with pixel electrode PE (for example, by connecing
Contact hole).
Illustrate the usefulness that two thin film transistor (TFT)s are set with reference to Fig. 8, Fig. 8 shows embodiment illustrated in fig. 7
An optional implementation image element 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 Section Point N2Between voltage difference by first film transistor Tr1 and the second thin film transistor (TFT) Tr2
Share, i.e. first node N1With Section Point N2Between voltage difference be equal to first node N1With the 3rd node N3Between voltage
Difference and the 3rd node N3Voltage difference sum between Section Point N2.
In other words, by setting two thin film transistor (TFT)s so that the electricity between the source-drain electrode of each thin film transistor (TFT)
Pressure difference is further reduced, so as to reduce further the leakage current of thin film transistor (TFT), improves the display matter of electrophoretic display panel
Amount.
Alternatively, first film transistor Tr1 and the second thin film transistor (TFT) Tr2 can be incorporated in together.
Specifically, first film transistor Tr1 drain electrode is multiplexed with the second thin film transistor (TFT) Tr2 source electrode, and
First film transistor Tr1 gate electrode and the second thin film transistor (TFT) Tr2 gate electrode connection, in other words, thin film transistor (TFT)
Tr is double-gate film transistor.
By the way that thin film transistor (TFT) is set into double-gate film transistor, 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 method of electrophoretic display panel, for driving the various embodiments described above
Electrophoretic display panel.
Fig. 9 shows the indicative flowchart 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, and the second electricity is applied to each pixel electrode
Pressure.
Step 920, image address period, controller applies tertiary voltage to public electrode, and the 4th is applied to pixel electrode
Voltage or second voltage.
Wherein, first voltage and tertiary voltage opposite polarity, second voltage and the 4th polarity of voltage on the contrary, first voltage and
Simulation electricity of the absolute value of the voltage difference of second voltage opposite polarity, first voltage and second voltage not less than electrophoretic particle
The absolute value of the voltage 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 TFT source-drain electrode is reduced, so that electrophoresis
Display panel has relatively low 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,
Electrophoretic display panel shown in Figure 1A and Fig. 7) when, the timing diagram of step 910~step 920 refers to Fig. 2, Fig. 5 and Fig. 6 institute
Show.
Fig. 2, Fig. 5 and Fig. 6 show type of drive when electrophoretic display panel is white background color, below in conjunction with Figure 10
Type of drive when electrophoretic display panel is described with Figure 11 for black background color.Figure 10 shows the driving method shown in Fig. 9
Timing diagram, Figure 11 shows the operating diagram of the electrophoretic display panel of the sequential according to Figure 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, so that in public electrode CE and pixel electrode PEa/PEbBetween formed
Pixel electrode PE is pointed to from public electrode CE in reversed electric field E, reversed electric field E directiona/PEb, in the presence 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 for the pixel for keeping background colour.
During image is shown, controller applies the tertiary voltage V of negative polarity to public electrode CE3, to pixel electrode PEaApply
Plus the 4th voltage V of positive polarity4, to pixel electrode PEbApply the second voltage V of negative polarity2, so that in public electrode CE and picture
Plain electrode PEaBetween form positive field E, positive field E direction is from pixel electrode PEaPublic electrode CE is pointed to, in electric field force
In the presence of, the white particles M of positively chargedwIt is moved to public electrode CE sides, electronegative black particle MbIt is moved to pixel electricity
Pole PEaSide, pixel electrode PEaThe pixel presentation black (i.e. picture color) at place, and public electrode CE and pixel electrode PEbIt
Between electrophoretic particle keep it is constant.
Alternatively, 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.
Alternatively, 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。
With continued reference to Figure 12, 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, and the second electricity is applied 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 applies second to the pixel electrode of the pixel of gray scale to be shown
Voltage, public electrode keeps tertiary voltage.
The type of drive of the present embodiment is described in detail below in conjunction with Figure 13 and Figure 14.Figure 13 shows the drive shown in Figure 12
The timing diagram of dynamic method, Figure 14 shows the operating diagram of the electrophoretic display panel of the sequential according to 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, so that in public electrode CE and pixel electrode PEa/PEb/PEcBetween form reversed electric field
Pixel electrode PE is pointed to from public electrode CE in E, reversed electric field E directiona/PEb/PEc, in the presence of electric field force, positively charged
White particles MwIt is moved to pixel electrode PEa/PEb/PEcSide, electronegative black particle MbPublic electrode CE sides are moved to,
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 for the pixel for keeping background colour, pixel electrode PEcFor the pixel electrode of the pixel of GTG to be shown.
During first image is shown, controller applies tertiary voltage V to public electrode CE3, to pixel electrode PEaAnd PEcApply
Plus the 4th voltage V4, to pixel electrode PEbApply second voltage V2, so that 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, positive field E direction is from picture
Plain electrode PEa/PEcPoint to public electrode CE, in the presence of electric field force, the white particles M of positively chargedwFrom 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 outside
Incident light is by white particles MwWith black particle MbReflection, pixel electrode PEa/PEcGTG is presented in the pixel at place, and pixel is electric
Pole PEbElectrophoretic particle between public electrode CE keeps constant.
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 voltages V3, so that in public electrode CE and pixel electrode PEaBetween formed
Positive field E, positive field E direction are from pixel electrode PEaPoint to public electrode CE, in the presence 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
Pole CE sides, 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 at place is presented white, and pixel electrode PEbWith public electrode
Electrophoretic particle and pixel electrode PE between CEcElectrophoretic particle between public electrode CE keeps constant.
By above-mentioned driving method, electrophoretic display panel realizes that GTG is shown.
Disclosed herein as well is a kind of display device, 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 is in addition to including electrophoretic display panel as above, also
Some other known structures can be included.In order to not obscure the emphasis of the application, no longer these known structures will be entered
Row is further described.
The display device of the application can be any device for including electrophoretic display panel as above, include but is not limited to such as
Electronic Paper 1500, e-book, billboard shown in Figure 15, applied to the display in Intelligent worn device, 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 domain of the application.
Electrophoretic display panel and its driving method and display device that the application is provided, electrophoretic display panel is during operation
Respectively to public electrode and the opposite polarity voltage signal of pixel electrode application, the voltage difference between TFT source-drain electrode is relatively low, because
This electrophoretic display panel has relatively low 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.People in the art
Member should be appreciated that invention scope involved in the application, however it is not limited to the technology of the particular combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, is carried out by above-mentioned technical characteristic or its equivalent feature
Other technical schemes formed by any combination.Such as features described above has similar work(with (but not limited to) disclosed herein
The technical characteristic of energy carries out technical scheme formed by replacement mutually.
Claims (12)
1. a kind of electrophoretic display panel, it is characterised in that including controller, public electrode, multiple pixel electrodes and positioned 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, first voltage is applied to the public electrode, second voltage is applied to each pixel electrode；
Image address period, tertiary voltage is applied to the public electrode, and the 4th voltage or described is applied to the pixel electrode
Second voltage；
Wherein, the first voltage and the tertiary voltage opposite polarity, the second voltage and the 4th polarity of voltage phase
Instead, the first voltage and the second voltage opposite polarity；
Simulation electricity of the absolute value not less than the electrophoretic particle of the first voltage and the voltage difference of the second voltage
Pressure, the tertiary voltage and simulation electricity of the absolute value not less than the electrophoretic particle of the voltage difference of the 4th voltage
Pressure.
2. electrophoretic display panel according to claim 1, it is characterised in that the first voltage and the tertiary voltage width
Value is equal, and the second voltage and the 4th voltage magnitude are equal.
3. electrophoretic display panel according to claim 2, it is characterised in that the first voltage and the second voltage width
Value is equal.
4. electrophoretic display panel according to claim 1, it is characterised in that the electrophoretic display panel also includes multiple thin
Film transistor, for the second voltage or the 4th voltage to be delivered into the pixel electrode.
5. electrophoretic display panel according to claim 4, it is characterised 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, it is characterised in that the pixel electrode passes through two films
Controller described in transistor AND gate is connected.
7. electrophoretic display panel according to claim 4, it is characterised 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, it is characterised 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, and the second electricity is applied to each pixel electrode
Pressure；
Image address period, the controller applies tertiary voltage to the public electrode, and the 4th is applied to the pixel electrode
Voltage or the second voltage；
Wherein, the first voltage and the tertiary voltage opposite polarity, the second voltage and the 4th polarity of voltage phase
Instead, the first voltage and the second voltage opposite polarity；
Simulation electricity of the absolute value not less than the electrophoretic particle of the first voltage and the voltage difference of the second voltage
Pressure, the tertiary voltage and simulation electricity of the absolute value not less than the electrophoretic particle of the voltage difference of the 4th voltage
Pressure.
9. driving method according to claim 8, it is characterised 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, it is characterised in that the first voltage and the second voltage amplitude
It is equal.
11. driving method according to claim 8, it is characterised in that described image address period is write including the first image
With the second image address period during entering, the driving method further comprises：
Described first image address period, the controller applies the tertiary voltage to the public electrode, to ash to be shown
The pixel electrode of the pixel of degree applies the 4th voltage；
The second image address period, the controller applies described the to the pixel electrode of the pixel of gray scale to be shown
Two voltages, the public electrode keeps the tertiary voltage.
12. a kind of display device, it is characterised in that including the display panel as described in claim any one of 1-11.
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| CN109830217A (en) * | 2019-04-09 | 2019-05-31 | 上海中航光电子有限公司 | Liquid crystal display panel, display device and driving method |
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