CN113917758A - Electronic paper display device and driving method thereof - Google Patents
Electronic paper display device and driving method thereof Download PDFInfo
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- CN113917758A CN113917758A CN202111208657.3A CN202111208657A CN113917758A CN 113917758 A CN113917758 A CN 113917758A CN 202111208657 A CN202111208657 A CN 202111208657A CN 113917758 A CN113917758 A CN 113917758A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/1675—Constructional details
- G02F1/1676—Electrodes
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/1685—Operation of cells; Circuit arrangements affecting the entire cell
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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
The application discloses an electronic paper display device and a driving method thereof, which are used for improving the display effect. The driving method provided by the embodiment of the application comprises the following steps: according to an image to be displayed, applying a first driving signal to a second electrode in the microstructure displaying the third color, and applying a second driving signal to a second electrode in the microstructure displaying the second color; the first drive signal includes: a first level signal and a second level signal sequentially applied to the second electrode in a write phase; the second drive signal includes: a third level signal and a fourth level signal applied to the second electrode in a writing phase; the starting time of the third level signal is not later than the starting time of the second level signal, and the ending time of the third level signal is not earlier than the ending time of the second level signal; the third level signal is used for: and an electric field for driving the second color charged particles to move to the display side is prevented from being generated between the second electrode corresponding to the microstructure displaying the second color and the first electrode corresponding to the adjacent microstructure displaying the third color.
Description
Technical Field
The present disclosure relates to display technologies, and in particular, to an electronic paper display device and a driving method thereof.
Background
The electronic paper display device has the effects of protecting eyes and saving electricity, and therefore has attracted much attention.
The electronic paper display device comprises a plurality of microstructures, a first electrode and a second electrode, wherein the first electrode and the second electrode are arranged on two opposite sides of each microcup, electrophoretic particles are packaged in each microcup and comprise black particles, red particles and white particles. The electronic paper display device controls the plurality of microstructures to display different colors by controlling the electric fields generated by the first electrode and the second electrode, so that display can be realized. However, when the electronic paper display device of the prior art displays a red picture in a low-temperature operation stage, the corners of the red picture are whitened, which affects the display effect.
Disclosure of Invention
The embodiment of the application provides an electronic paper display device and a driving method thereof, which are used for improving the display effect.
An embodiment of the present application provides a driving method for an electronic paper display device, where the electronic paper display device includes: a plurality of microstructures arranged in an array, the microstructures comprising: the first electrode and the second electrode are oppositely arranged, and the first color charged particles, the second color charged particles and the third color charged particles are positioned between the first electrode and the second electrode; the driving method comprises the following steps:
according to an image to be displayed, applying a first driving signal to a second electrode in the microstructure displaying the third color, and applying a second driving signal to a second electrode in the microstructure displaying the second color;
the first drive signal includes: a first level signal and a second level signal sequentially applied to the second electrode in a write phase; the first level signal is used for: bringing the third color charged particles close to the display side of the electronic paper display device; the second level signal is used for: pulling the first color charged particles away from the display side;
the second drive signal includes: a third level signal applied to the second electrode in a writing phase, and a fourth level signal applied to the second electrode at least after the third level signal; the starting time of the third level signal is not later than that of the second level signal, and the ending time of the third level signal is not earlier than that of the second level signal; the third level signal is used for: an electric field for driving the charged particles of the second color to move to the display side is prevented from being generated between the second electrode corresponding to the microstructure displaying the second color and the first electrode corresponding to the adjacent microstructure displaying the third color; the fourth level signal is used for: the second color charged particles are brought close to the display side of the electronic paper display device.
In some embodiments, the start time of the second level signal and the start time and the end time of the third level signal are the same.
In some embodiments, the second drive signal further comprises: a fourth level signal applied to the second electrode before the third level signal;
the fourth level signal before the third level signal has an overlapping area with the first level signal in terms of time.
In some embodiments, the first level signal is electrically opposite to the second level signal, and the second level signal is electrically the same as the fourth level signal;
when the third level signal is not zero, the third level signal is opposite to the fourth level signal in electrical property.
In some embodiments, the charged particles of the second color are negatively charged; the third level signal is 0V or more and 0.1V or less.
In some embodiments, before applying the first driving signal to the second electrode corresponding to the microstructure displaying the third color and applying the second driving signal to the second electrode corresponding to the microstructure displaying the second color according to the image to be displayed, the method further includes:
detecting the ambient temperature, and judging whether the ambient temperature is in a first preset temperature range;
and when the ambient temperature is in a first preset range, applying a second driving signal to a second electrode corresponding to the microstructure displaying the second color.
In some embodiments, the first predetermined temperature range is: -5 to 5 degrees celsius.
In some embodiments, the first driving signal specifically includes: a plurality of pulse units and a zero voltage signal positioned between adjacent pulse units; the pulse unit comprises a first level signal and a second level signal which are applied in sequence;
the starting time of the third level signal is not later than that of the second level signal in the first pulse unit, and the ending time of the third level signal is not earlier than that of the second level signal in the first pulse unit; the ending time of the fourth level signal after the third level signal is earlier than the starting time of the second pulse unit.
An electronic paper display device that this application embodiment provided, electronic paper display device includes: a plurality of microstructures arranged in an array; the microstructure includes: the first electrode and the second electrode are oppositely arranged, and the first color charged particles, the second color charged particles and the third color charged particles are positioned between the first electrode and the second electrode; the electronic paper display device further includes: a processor; the processor is used for driving the electronic paper display device by the driving method provided by the embodiment of the application.
In some embodiments, the first color charged particles are black charged particles, the second color charged particles are white charged particles, and the third color charged particles are red charged particles.
According to the electronic paper display device and the driving method thereof provided by the embodiment of the application, when the second electrode corresponding to the microstructure displaying the third color applies the second level signal, the second electrode corresponding to the microstructure displaying the second color applies the third level signal, so that an electric field for driving the charged particles of the second color to move to the display side cannot be generated between the second electrode corresponding to the microstructure displaying the second color and the adjacent first electrode corresponding to the microstructure displaying the third color, the color of the microstructure displaying the third color can be prevented from deviating to the second color, and the display effect can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an electronic paper display device according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a driving method of an electronic paper display device according to an embodiment of the present disclosure;
fig. 3 is a timing diagram illustrating a driving method of an electronic paper display device according to an embodiment of the present disclosure;
fig. 4 is a timing diagram of another driving method of an electronic paper display device according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present disclosure. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
An electronic paper display device provided in an embodiment of the present application, as shown in fig. 1, includes: a plurality of microstructures 1 arranged in an array; the microstructure 1 includes: first and second electrodes 2 and 3 disposed opposite to each other, first, second, and third color charged particles 4, 5, and 6 between the first and second electrodes 2 and 3; the first color charged particles 4 have an electrical property opposite to that of the second color charged particles 5, and the first color charged particles 4 have an electrical property identical to that of the third color charged particles 6; the charge-to-mass ratio of the first color charged particles 4 is larger than the charge-to-mass ratio of the third color charged particles 6; the first electrode 2 is located on the display side of the first color charged particles 4, the second color charged particles 5 near the electronic paper display device, and the second electrode 3 is located away from the display side.
In some embodiments, as shown in fig. 1, the electronic paper display device further includes a substrate base plate 7 and a cover plate 8. The first electrode 2 is located between the cover plate 8 and the respective charged particles, and the second electrode 3 is located between the base substrate 7 and the respective charged particles.
In some embodiments, the first color charged particles are black charged particles, the second color charged particles are white charged particles, and the third color charged particles are colored charged particles.
In some embodiments, the colored charged particles are red charged particles.
In some embodiments, as shown in fig. 1, the first electrodes 2 corresponding to the plurality of microstructures 1 may be integrally connected. Namely, the first electrode positioned on the display side of the microstructure is a planar electrode covering a plurality of microstructure areas. In this case, the voltage signals applied to the first electrodes corresponding to the plurality of microstructures are the same.
Of course, in some embodiments, the first electrodes corresponding to the plurality of microstructures may not be connected to each other. In this case, the voltage signals applied to the first electrodes corresponding to the plurality of microstructures may be the same or different.
When the voltage signals applied to the first electrodes corresponding to the plurality of microstructures are the same, the first electrodes may be grounded, that is, the voltage applied to the first electrodes is 0 volt (V).
In some embodiments, the first and third color charged particles are positively charged and the second color charged particles are negatively charged. Of course, the first color charged particles and the third color charged particles may be negatively charged, and the second color charged particles may be positively charged.
An embodiment of the present application provides a driving method of an electronic paper display device, as shown in fig. 2, the driving method includes:
s101, according to an image to be displayed, applying a first driving signal to a second electrode in the microstructure displaying a third color, and applying a second driving signal to a second electrode in the microstructure displaying a second color;
as shown in fig. 3, the first drive signal T1 includes: a first level signal V1 and a second level signal V2 sequentially applied to the second electrode during a write phase; the first level signal V1 is used to: bringing the third color charged particles close to the display side of the electronic paper display device; the second level signal V2 is used for: pulling the first color charged particles away from the display side;
as shown in fig. 3, the second drive signal T2 includes: a third level signal V3 applied to the second electrode, a fourth level signal V4 applied to the second electrode at least after the third level signal V3 during the writing phase; the start time of the third level signal V3 is no later than the start time of the second level signal V2, and the end time of the third level signal V3 is no earlier than the end time of the second level signal V2; the third level signal V3 is used for: an electric field for driving the charged particles of the second color to move to the display side is prevented from being generated between the second electrode corresponding to the microstructure displaying the second color and the first electrode corresponding to the adjacent microstructure displaying the third color; the fourth level signal V4 is used to: the second color charged particles are brought close to the display side of the electronic paper display device.
In the related art, since the first color charged particles and the third color charged particles have the same electrical property, when the first level signal is applied to the second electrode corresponding to the microstructure that needs to display the third color, the first color charged particles will also move to the display side, and therefore the second level signal needs to be applied to the second electrode to pull the first color charged particles to move away from the display side. And since the third color charged particles are opposite to the second color charged particles in electrical property, the electrical property of the second level signal is the same as the electrical property of the fourth level signal for driving the second color charged particles to approach the display side, namely, when a second level signal is applied to the second electrode corresponding to the microstructure which needs to display the third color, the charged particles of the second color in the microstructure will also move to the display side, and when the microstructure corresponding to the third color is adjacent to the microstructure corresponding to the second color, if a fourth level signal is applied to the second electrode corresponding to the microstructure displaying the second color, an electric field formed between the fourth level signal and the first electrode corresponding to the microstructure displaying the third color will also act on the charged particles of the second color in the microstructure displaying the third color, so as to further enhance the pushing of the charged particles of the second color to the display side. Subsequently, when the second electrode corresponding to the microstructure displaying the second color keeps applying the fourth level signal, the electric field formed between the fourth level signal and the first electrode corresponding to the microstructure displaying the third color will continue to push the charged particles of the second color to move to the display side, and the charged particles of the second color move to the top end of the microstructure, so that the color of the microstructure which should display the third color is biased to the second color, and the display effect is affected.
According to the driving method provided by the embodiment of the application, when the second electrode corresponding to the microstructure displaying the third color applies the second level signal, the second electrode corresponding to the microstructure displaying the second color applies the third level signal, so that an electric field for driving the charged particles of the second color to move to the display side cannot be generated between the second electrode corresponding to the microstructure displaying the second color and the adjacent first electrode corresponding to the microstructure displaying the third color, the microstructure displaying the third color can be prevented from being biased to the second color, and the display effect can be improved.
In some embodiments, a 0V voltage signal is applied to the first electrode corresponding to each microstructure.
In some embodiments, the first level signal and the second level signal are opposite in electrical property, the first level signal and the third color charged particles are the same in electrical property, and the absolute value of the voltage of the first level signal is smaller than that of the second level signal.
Since the first color charged particles and the third color charged particles have the same electrical property, when the first level signal is applied to the second electrode, the first color charged particles also move to the display side. In order to avoid the third color frame from deviating to the first color, the first color band is pulled by applying the second level signal to the second electrodeThe electric particles move away from the display side. The velocity v1 of the charged particles is:
the response time of the charged particles is:
where U is the electric field strength, d is the vertical distance between the first and second electrodes, m is the mass of the charged particles, Q is the charge amount of the charged particles, t is the time, η is the mechanical efficiency, ζ is the potential, and ε is the dielectric constant. Therefore, since the first color charged particles and the third color charged particles have the same electrical property, and the charge-to-mass ratio of the first color charged particles is greater than that of the third color charged particles, when the second level signal is applied to the second electrode, the moving speed of the first color charged particles is greater than that of the third color charged particles, so as to increase the distance between the first color charged particles and the third color charged particles, and prevent the third color picture from being biased to the first color.
In some embodiments, as shown in fig. 3, the start time t1 and the end time t2 of the second level signal V2 and the third level signal V3 are the same.
In some embodiments, as shown in fig. 3, the second driving signal T2 further includes: a fourth level signal V4 applied to the second electrode before the third level signal V3;
the fourth level signal V4 preceding the third level signal V3 has an overlapping region in time with the first level signal V1.
In some embodiments, as shown in FIG. 3, the first level signal V1 is electrically opposite to the second level signal V2, and the second level signal V2 is electrically the same as the fourth level signal V4.
In some embodiments, when the third level signal is not zero, the third level signal is electrically opposite to the fourth level signal.
In some embodiments, the charged particles of the second color are negatively charged; the third level signal is equal to or greater than 0 volt (V) and equal to or less than 0.1V.
Therefore, an electric field for driving the second color charged particles to move to the display side can be prevented from being generated between the second electrode corresponding to the microstructure displaying the second color and the first electrode corresponding to the adjacent microstructure displaying the third color.
It should be noted that fig. 3 illustrates an example in which the third level signal is equal to 0 v.
The electronic paper display device includes a display area; when the first color is black, the second color is white, and the third color is red, when the electronic paper needs to display a red screen, an area surrounding the red screen needs to display a white screen, that is, the display area is divided into a first display area and a second display area surrounding the first display area, the first display area displays the red screen, and the second display area displays the white screen.
In some embodiments, according to an image to be displayed, applying a first driving signal to a second electrode corresponding to a microstructure displaying a third color, and applying a second driving signal to a second electrode corresponding to a microstructure displaying a second color specifically includes:
and applying a first driving signal to the second electrode corresponding to the microstructure in the first display area, and applying a second driving signal to the second electrode corresponding to the microstructure in the second display area.
It should be noted that, in the related art, in the writing stage, when the second voltage signal is applied to the second electrode of the first display area, the fourth level signal is applied to the second electrode in the second display area, and a fringe electric field is formed between the fourth level signal and the first electrode at the edge of the first display area, and the fringe electric field also acts on the second color charged particles in the microstructure at the edge of the first display area, so as to further push the second color charged particles to move to the display side. And subsequently, under the continuous action of the fringe electric field, the second color charged particles continuously move to the display side, so that the edge of the first display area has poor whitening. Especially, in the corner region of the first display region, the white defect is more serious when the corner region is simultaneously subjected to the fringe electric fields of the two regions.
In the driving method of the electronic paper display device provided in the embodiment of the application, for the case that the first display area displays the third color and the second display area displays the second color, when the second electrode in the first display area applies the second level signal, the second electrode in the second display area applies the third level signal, so that an edge electric field for driving the second color charged particles to move to the display side is not generated between the second electrode in the second display area and the first electrode at the edge of the first display area, the microstructure color displaying the third color is prevented from being biased to the second color, and the display effect is improved.
In some embodiments, as shown in fig. 3, the first driving signal T1 specifically includes: a plurality of pulse units Z and zero-voltage signals positioned between adjacent pulse units Z; the pulse unit Z includes a first level signal V1 and a second level signal V2 applied in sequence;
the start time of the third level signal V3 is no later than the start time of the second level signal V2 in the first pulse unit Z1, and the end time of the third level signal V3 is no earlier than the end time of the second level signal V2 in the first pulse unit Z1; the end time of the fourth level signal V4 after the third level signal V3 is earlier than the start time of the second pulse unit Z2.
In some embodiments, as shown in fig. 3, during the writing phase, the first driving signal T1 further includes: a zero voltage signal before the first pulse unit Z1 and after the second pulse unit Z2.
In some embodiments, as shown in fig. 3, in the writing phase, the second driving signal T2 further includes: a zero-voltage signal before the first fourth level signal V4 and after the second fourth level signal V4.
In some embodiments, the driving method provided by the embodiments of the present application further includes: according to an image to be displayed, applying a third driving signal to a second electrode corresponding to the microstructure displaying the first color; as shown in fig. 3, in the writing phase, the third driving signal T3 includes: a fifth level signal V5, and zero-voltage signals before and after the fifth level signal V5; the fifth level signal V5 is used to: and enabling the first color charged particles to be close to the display side of the electronic paper display device so as to enable the microstructure to display the first color.
In some embodiments, the first level signal and the fifth level signal have the same electrical property as the first color charged particles; the second level signal and the fourth level signal have the same electrical property as the second color charged particles.
In some embodiments, the absolute value of the second level signal, the absolute value of the fourth level signal, and the absolute value of the fifth level signal are equal.
In fig. 3, the first color charged particles, the third color charged particles, and the second color charged particles are illustrated as being positively charged and negatively charged. In fig. 3, the first level signal and the fifth level signal are positive voltage signals, and the second level signal and the fourth level signal are negative voltage signals.
In some embodiments, the first level signal V1 is 6V, the second level signal and the fourth level signal are-15V, and the fifth level signal is 15V.
In some embodiments, before applying the first driving signal to the second electrode corresponding to the microstructure displaying the third color and applying the second driving signal to the second electrode corresponding to the microstructure displaying the second color according to the image to be displayed, the method further includes:
detecting the ambient temperature, and judging whether the ambient temperature is in a first preset temperature range;
and when the ambient temperature is in a first preset range, applying a second driving signal to a second electrode corresponding to the microstructure displaying the second color.
In some embodiments, the first predetermined temperature range is: -5 to 5 ℃. Namely, the first preset temperature range is a low temperature range.
It should be noted that the charging rate when the ambient temperature is in the high temperature range is higher than the charging rate when the ambient temperature is in the normal temperature range, and the charging rate when the ambient temperature is in the normal temperature range is higher than the charging rate when the ambient temperature is in the low temperature stage. In general, for the first driving signal, the duration of the second level signal in the writing phase when the ambient temperature is in the high temperature range is longer than the duration of the second level signal in the writing phase when the ambient temperature is in the normal temperature range, and the duration of the second level signal in the writing phase when the ambient temperature is in the normal temperature range is longer than the duration of the second level signal in the writing phase when the ambient temperature is in the low temperature range. And when the environment temperature is in a high temperature range, writing the second level signal in the writing stage for about 1 frame, when the environment temperature is in a normal temperature range, writing the second level signal in the writing stage for about 2-3 frames, and when the environment temperature is in a low temperature range, writing the second level signal in the writing stage for about 4-5 frames. That is, when the ambient temperature is in the high temperature range and the normal temperature range, the duration of the second level signal in the writing stage is short, and when the ambient temperature is in the low temperature range, the duration of the second level signal in the writing stage is long. If the second level signal continues for a period, the second electrode corresponding to the microstructure displaying the second color applies the fourth level signal in the high temperature range and the normal temperature range, even if the fringe electric field exists, because the duration of the second level signal is short, the duration of the reinforcing action on the charged particles displaying the second color in the microstructure displaying the third color is short, and the charged particles displaying the second color are not pushed to the top end of the microstructure. In the low-temperature stage, the duration of the second level signal is long, the duration of the strengthening action on the second color charged particles in the microstructure displaying the third color is long, and the second color charged particles are easily pushed to the top end of the microstructure under the continuous action of the subsequent fringe electric field.
According to the driving method of the electronic paper display device provided by the embodiment of the driving method, when the ambient temperature is in the first preset temperature range, the second driving signal is applied to the second electrode corresponding to the microstructure displaying the second color, so that when the second electrode corresponding to the microstructure displaying the third color is applied with the second level signal, the second electrode corresponding to the microstructure displaying the second color is applied with the third level signal, an electric field for driving the charged particles of the second color to move to the display side cannot be generated between the second electrode corresponding to the microstructure displaying the second color and the adjacent first electrode corresponding to the microstructure displaying the third color, the color of the microstructure displaying the third color can be prevented from being biased to the second color, and the display effect can be improved.
In a specific implementation, the second driving signal may be applied to the second electrode corresponding to the microstructure displaying the second color only in the low temperature stage, or may be applied to the second electrode corresponding to the microstructure displaying the second color in each temperature stage. The risk of the display deviating to the second color is further avoided.
In some embodiments, as shown in fig. 4, the first driving signal T1, the second driving signal T2, and the third driving signal T3 further include: the balance phase and the jitter phase. The balance phase comprises a first balance phase and a second balance phase, and the jitter phase comprises a first jitter phase and a second jitter phase. In the first balance phase, the first driving signal T1, the second driving signal T2 and the third driving signal T3 are used for: the charges of the first color charged particles and the second color charged particles are balanced, and the first color charged particles and the second color charged particles are prevented from being polarized. In the second balance phase, the first driving signal T1, the second driving signal T2 and the third driving signal T3 are used for: charge of the third color charged particles is balanced. In the first dithering phase, the first driving signal T1, the second driving signal T2 and the third driving signal T3 include positive voltage signals and negative voltage signals applied alternately at a slow speed, and are used for: so that the first color charged particles and the second color charged particles are separated. In the second dithering phase, the first driving signal T1, the second driving signal T2 and the third driving signal T3 include positive voltage signals and negative voltage signals applied alternately in a fast manner, for: the third color charged particles are separated from the first color charged particles.
Based on the same inventive concept, the electronic paper display device provided by the embodiment of the present application further includes: a processor; the processor is used for driving the electronic paper display device by adopting the driving method provided by the embodiment of the application.
In some embodiments, the electronic paper display device further comprises: and the temperature detection module is used for detecting the ambient temperature.
And when the temperature detection module detects that the ambient temperature is in a first preset range, applying a second driving signal to a second electrode corresponding to the microstructure displaying the second color through the driving chip.
In some embodiments, the temperature detection module includes a temperature sensor.
The electronic paper display device provided by the embodiment of the application is as follows: tablet readers, and the like, any product or component having a display function. Other essential components of the electronic paper display device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present application. The implementation of the electronic paper display device can refer to the above embodiment of the driving method of the electronic paper display device, and repeated details are not repeated.
In summary, according to the electronic paper display device and the driving method thereof provided in the embodiment of the present application, when the second electrode corresponding to the microstructure displaying the third color applies the second level signal, the second electrode corresponding to the microstructure displaying the second color applies the third level signal, so that an electric field for driving the charged particles of the second color to move to the display side is not generated between the second electrode corresponding to the microstructure displaying the second color and the adjacent first electrode corresponding to the microstructure displaying the third color, the microstructure color displaying the third color can be prevented from being biased to the second color, and the display effect can be improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A driving method of an electronic paper display device, the electronic paper display device comprising: a plurality of microstructures arranged in an array, the microstructures comprising: the display device comprises a first electrode, a second electrode, first color charged particles, second color charged particles and third color charged particles, wherein the first electrode and the second electrode are oppositely arranged, and the first color charged particles, the second color charged particles and the third color charged particles are positioned between the first electrode and the second electrode; characterized in that the method comprises:
according to an image to be displayed, applying a first driving signal to the second electrode in the microstructure displaying a third color, and applying a second driving signal to the second electrode in the microstructure displaying a second color;
the first drive signal includes: a first level signal and a second level signal sequentially applied to the second electrode in a write phase; the first level signal is used for: bringing the third color charged particles close to a display side of the electronic paper display device; the second level signal is used for: pulling the first color charged particles away from the display side;
the second drive signal includes: a third level signal applied to the second electrode in a write phase, a fourth level signal applied to the second electrode at least after the third level signal; the starting time of the third level signal is not later than that of the second level signal, and the ending time of the third level signal is not earlier than that of the second level signal; the third level signal is used for: avoiding an electric field for driving the charged particles of the second color to move to the display side between the second electrode corresponding to the microstructure displaying the second color and the first electrode corresponding to the microstructure displaying the third color; the fourth level signal is used for: bringing the second color charged particles close to a display side of the electronic paper display device.
2. The method of claim 1, wherein the start time of the second level signal and the start time and the end time of the third level signal are the same.
3. The method of claim 2, wherein the second drive signal further comprises: a fourth level signal applied to the second electrode before the third level signal;
the fourth level signal before the third level signal has an overlapping area with the first level signal in terms of time.
4. The method of claim 3, wherein the first level signal is electrically opposite to the second level signal, and the second level signal is electrically the same as the fourth level signal;
when the third level signal is not zero, the third level signal and the fourth level signal are opposite in electrical property.
5. The method of claim 4, wherein the second color charged particles are negatively charged; the third level signal is greater than or equal to 0V and less than or equal to 0.1V.
6. The method according to any one of claims 1 to 5, wherein before applying the first driving signal to the second electrode corresponding to the microstructure displaying the third color and applying the second driving signal to the second electrode corresponding to the microstructure displaying the second color according to the image to be displayed, the method further comprises:
detecting the ambient temperature, and judging whether the ambient temperature is in a first preset temperature range;
and when the ambient temperature is in the first preset range, applying the second driving signal to the second electrode corresponding to the microstructure displaying the second color.
7. The method of claim 6, wherein the first predetermined temperature range is: -5 to 5 degrees celsius.
8. The method according to any of claims 1 to 4 and 7, wherein the first driving signal comprises: the pulse unit comprises a plurality of pulse units and zero-voltage signals positioned between the adjacent pulse units; the pulse unit comprises the first level signal and the second level signal which are applied in sequence;
the starting time of the third level signal is not later than the starting time of the second level signal in the first pulse unit, and the ending time of the third level signal is not earlier than the ending time of the second level signal in the first pulse unit; the ending time of the fourth level signal after the third level signal is earlier than the starting time of the second pulse unit.
9. An electronic paper display device, comprising: a plurality of microstructures arranged in an array; the microstructure includes: the display device comprises a first electrode, a second electrode, first color charged particles, second color charged particles and third color charged particles, wherein the first electrode and the second electrode are oppositely arranged, and the first color charged particles, the second color charged particles and the third color charged particles are positioned between the first electrode and the second electrode; characterized in that, the electronic paper display device further includes: a processor; the processor is used for driving the electronic paper display device by adopting the method of any one of claims 1 to 8.
10. The electronic paper display device according to claim 9, wherein the first color charged particles are black charged particles, the second color charged particles are white charged particles, and the third color charged particles are red charged particles.
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| CN115116403A (en) * | 2022-08-29 | 2022-09-27 | 惠科股份有限公司 | Electronic ink screen, control method and device thereof, and computer-readable storage medium |
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