CN113689826B - Electronic paper driving method, electronic paper and storage medium - Google Patents
Electronic paper driving method, electronic paper and storage medium Download PDFInfo
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- CN113689826B CN113689826B CN202110974805.6A CN202110974805A CN113689826B CN 113689826 B CN113689826 B CN 113689826B CN 202110974805 A CN202110974805 A CN 202110974805A CN 113689826 B CN113689826 B CN 113689826B
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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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
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Abstract
The application discloses a driving method of electronic paper, the electronic paper and a storage medium, relates to the technical field of display, and can solve the problem that frequent switching of high and low levels on a data signal line easily causes crossbar of a display picture to influence the display effect of the electronic paper in the activation stage of the conventional driving method. The driving method of the electronic paper comprises the following steps: alternately inputting a first level and a second level to a data signal line of the electronic paper at a first set frequency to form a drive phase for driving the electronic paper, wherein the first level is greater than the second level, and a first transition level is provided between the first level and the second level in each period of the drive phase, and the first transition level lasts for a first set time.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a driving method for electronic paper, and a storage medium.
Background
Electronic paper is a generic name of a technology, and is generally called as E-paper, and most of the electronic paper adopts EPD (electrophoretic Display) as a Display panel, and the Display effect of the electronic paper is close to the natural paper effect, so that the electronic paper is free from reading fatigue. The driving of the existing electronic paper mainly comprises a reverse phase, an activation phase and a writing phase, wherein the activation phase is used for mixing particles in the electronic paper film uniformly through frequent switching of high and low levels on a data signal line.
However, in the active phase of the conventional driving method, frequent switching of high and low levels on the data signal line easily causes Crosstalk (Crosstalk) on the display screen, which affects the display effect of the electronic paper.
Disclosure of Invention
The embodiment of the application provides a driving method of electronic paper, electronic paper and a storage medium, which can solve the problem that frequent switching of high and low levels on a data signal line easily causes crossbar of a display picture to affect the display effect of the electronic paper in an activation stage of the existing driving method.
In a first aspect of embodiments of the present application, a method for driving electronic paper is provided, including:
alternately inputting a first level and a second level to a data signal line of the electronic paper at a first set frequency to form an excitation phase for driving the electronic paper, wherein the first level is greater than the second level, and a first transition level is provided between the first level and the second level in each period of the excitation phase, the first transition level lasting for a first set time.
In some embodiments, before the step of alternately inputting the first level and the second level to the data signal line of the electronic paper at the first set frequency to form the excitation phase for driving the electronic paper, the method further includes:
determining the number of the first transition levels in each period of the excitation phase according to the difference between the first level and the second level.
In some embodiments, the step of determining the number of first transition levels in each period of the excitation phase based on the difference between the first level and the second level comprises:
determining a minimum on-voltage and a maximum off-voltage input by a scanning signal line of the electronic paper, wherein the minimum on-voltage is a minimum voltage for driving a gate electrode of a driving device of the electronic paper to be on, and the maximum off-voltage is a maximum voltage for driving the gate electrode of the driving device to be off;
and determining the number and the value of the first transition level in each period of the excitation phase according to the difference value of the first level and the second level and the minimum on voltage and the maximum off voltage input by the scanning signal line.
In some embodiments, the first set time is a multiple of a voltage offset time of a scanning signal line of the electronic paper, wherein the voltage offset of the scanning signal line is caused by the level of the data signal line alternating between the first level and the second level, the voltage offset time being a duration of the scanning signal line voltage offset.
In some embodiments, each cycle of the excitation phase includes a voltage rise half cycle and a voltage fall half cycle, the first transition level in the voltage rise half cycle is a rise transition level, the first transition level in the voltage fall half cycle is a fall transition level, and the voltage offset time includes an off-state voltage offset time and an on-state voltage offset time of the scan signal line;
the first set time corresponding to the rising transition level is 1-5 times of the off-state voltage shift time, and the first set time corresponding to the falling transition level is 1-5 times of the on-state voltage shift time, wherein the off-state voltage is a voltage at which a gate electrode of a driving device in the electronic paper is turned off, and the on-state voltage is a voltage at which the gate electrode of the driving device in the electronic paper is turned on.
In some embodiments, after the step of alternately inputting the first level and the second level to the data signal line of the electronic paper according to the first set frequency to form the excitation phase for driving the electronic paper, the method further includes:
and alternately inputting the first level and the second level to the data signal line according to a second set frequency to form a rapid excitation stage for driving the electronic paper, wherein the second set frequency is greater than the first set frequency, and a second transition level is arranged between the first level and the second level in each period of the rapid excitation stage and lasts for a second set time.
In some embodiments, the number of the second transition levels is the same as the number of the first transition levels within a single period, and the second set time is different from the first set time.
In some embodiments, the number of the first transition levels is three in a half period formed by the adjacent first level and the second level.
In a second aspect of the embodiments of the present application, there is provided an electronic paper, including: an electronic paper screen and an electronic paper driving device;
the electronic paper driving apparatus is configured to:
alternately inputting a first level and a second level to a data signal line of the electronic paper at a first set frequency to form an excitation phase for driving the electronic paper, wherein the first level is greater than the second level, and a first transition level is provided between the first level and the second level in each period of the excitation phase, the first transition level lasting for a first set time.
In a third aspect of the embodiments of the present application, a storage medium is provided, where the storage medium includes a stored computer program, and when the computer program runs, the apparatus on which the storage medium is located is controlled to execute the method for driving electronic paper according to the first aspect.
In the driving method of the electronic paper, and the storage medium provided in the embodiment of the present application, in an excitation stage of driving the electronic paper, a first level and a second level are alternately input to a data signal line of the electronic paper according to a first set frequency, where the first level is greater than the second level, and in each period of the excitation stage, a first transition level is set between the first level and the second level, and the first transition level lasts for a first set time. By setting the first transition level and continuing the transition level for the first set time, the conversion speed of the first level and the second level of the data signal line in the excitation phase can be delayed, and the difference value of the first level conversion is reduced, so that the capacitance value of the coupling capacitor is reduced, the amplitude of the pulled driving voltage of the driving device is reduced, the state change of the driving device can be avoided, and the problem that the frequent switching of the high level and the low level on the data signal line easily causes the Crosstalk of a display picture and influences the display effect of the electronic paper in the activation phase of the existing driving method can be solved.
Drawings
Fig. 1 is a schematic flowchart of a driving method of electronic paper according to an embodiment of the present application;
fig. 2 is a schematic diagram of a driving timing sequence of a data signal line of an electronic paper according to an embodiment of the present disclosure;
fig. 3 is a schematic view of a pixel structure of an electronic paper according to an embodiment of the present disclosure;
fig. 4 is a timing diagram of a data signal line of an electronic paper in an activation phase according to an embodiment of the present disclosure;
fig. 5 is a timing diagram of a data signal line of an electronic paper in an activation phase according to an embodiment of the present disclosure;
FIG. 6 is a timing diagram of a data signal line of an electronic paper at a fast activation stage according to an embodiment of the present disclosure;
fig. 7 is a schematic structural block diagram of a storage medium according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present application.
Detailed Description
In order to better understand the technical solutions provided by the embodiments of the present specification, the technical solutions of the embodiments of the present specification are described in detail below with reference to the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and examples of the present specification are detailed descriptions of the technical solutions of the embodiments of the present specification, and are not limitations on the technical solutions of the embodiments, and the technical features of the embodiments and examples of the present specification may be combined with each other without conflict.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element. The term "two or more" includes the case of two or more.
Electronic paper is a general name of a technology, and is called as E-paper in English, and most EPDs are used as display panels, so that the display effect of the electronic paper is close to the natural paper effect, and the electronic paper is free from reading fatigue. The driving of the existing electronic paper mainly includes a reverse phase, an activation phase and a writing phase, wherein the activation phase mixes the particles in the electronic paper film uniformly by frequently switching the high and low levels on the data signal line. However, in the active phase of the conventional driving method, frequent switching of high and low levels on the data signal line easily causes Crosstalk of the display image, which affects the display effect of the electronic paper.
In view of this, embodiments of the present application provide a method for driving an electronic paper, and a storage medium, which can solve the problem that frequent switching of high and low levels on a data signal line in an active phase of an existing driving method easily causes Crosstalk of a display screen, which affects a display effect of the electronic paper.
In a first aspect of an embodiment of the present application, a method for driving electronic paper is provided, and fig. 1 is a schematic flowchart of the method for driving electronic paper provided in the embodiment of the present application. As shown in fig. 1, a method for driving electronic paper provided in an embodiment of the present application includes:
s100: alternately inputting a first level and a second level to a data signal line of the electronic paper at a first set frequency to form an excitation phase for driving the electronic paper, wherein the first level is greater than the second level, and a first transition level is provided between the first level and the second level in each period of the excitation phase, the first transition level lasting for a first set time.
Fig. 2 is a schematic diagram of a driving timing sequence of a data signal line of an electronic paper according to an embodiment of the present disclosure. As shown in fig. 2, the electronic paper is driven mainly in a reverse phase, an excitation phase, and a writing phase, where an electrical signal is input to a data signal line of the electronic paper, and a high level is generally 15V and a low level is generally-15V. The electric signals of the reverse phase and the writing phase are opposite, and the reverse phase has the function of neutralizing the charges in the electronic paper so that the charges in the electronic paper are balanced. The write phase is to write the driving signal to be displayed into the data signal line, and thus the electrical signal of the inversion phase for balancing the charges is opposite to the electrical signal of the write phase. The purpose of the activation phase is to mix the particles in the electronic paper film uniformly by frequent switching of high and low levels on the data signal line, in preparation for the writing phase.
Exemplarily, fig. 3 is a schematic view of a pixel structure of electronic paper according to an embodiment of the present application. As shown in fig. 3, a pixel area of the electronic paper is defined by the data signal line 100 and the scanning signal line 200, an electronic paper film 300 and a driving device 400 are disposed in the pixel, and the driving device 400 drives the small particles in the electronic paper film 300 to move under the action of the scanning signal line 200 and the data signal line 100 to achieve the display effect. Generally, the particle balls in the electronic paper include black balls, white balls or red balls, and the embodiment of the present application is not particularly limited. The driving device 400 may be a transistor, the scan signal line 200 to input a scan signal to a gate electrode of the driving device 400, and the data signal line 100 to input a data signal to a source electrode or a drain electrode of the driving device 400. With reference to fig. 2 and fig. 3, in the activation phase, frequent refreshing of the high and low levels on the data signal line 100, i.e. switching of the high and low levels, is very fast, the refresh frequency is fast, the voltage difference between the high and low levels reaches 30V, a coupling capacitance is easily generated in the overlapping region 120 between the data signal line 100 and the scan signal line 200, and under the effect of the coupling capacitance, the driving voltage of the gate electrode of the driving device 400 is easily pulled. The driving voltages input to the scan signal line 200 for driving the gate electrode of the driving device 400 include an on-state voltage that drives the gate electrode of the driving device 400 to be turned on and an off-state voltage that drives the gate electrode of the driving device 400 to be turned off, and the turning on and off of the gate electrode of the driving device 400 are also the turning on and off of the driving device. Specifically, for example, when the data signal line 100 is lowered from a high level (15V) to a low level (-15V) in the activation phase, if the driving device 400 is in the on state, the on-state voltage for driving the driving device 400 to be on is VGH, the VGH is pulled down by the influence of the coupling capacitance, the normal VGH is 20V, after being pulled down, the VGH is usually 9.5V, the amplitude of the pulled down reaches 11.5V, and after the VGH is changed to 9.5V, the driving device 400 which should be in the on state is easily caused to be off, which may cause the abnormal display of the pixel. When the data signal line 100 is raised from a low level (-15V) to a high level (15V) in the activation phase, if the driving device 400 is in the off state, the off-state voltage for driving the driving device 400 to be off is VGL, the VGL is pulled up under the influence of the coupling capacitance, the normal VGL is-20V, after being pulled up, the VGL is usually-8V, the amplitude of the pulled up reaches 12v, and after the VGL is changed to-8V, the driving device 400 which should be in the off state is easily caused to be turned on, and then current leakage occurs, which causes the abnormal display of the pixel. Both of the above situations can cause Crosstalk to occur in the display of the electronic paper during the activation phase.
Fig. 4 is a schematic timing diagram of a data signal line of an electronic paper in an activation phase according to an embodiment of the present disclosure. As shown in fig. 4, in the driving method of the electronic paper according to the embodiment of the present application, in the excitation phase, according to the first set frequency, the first level and the second level are alternately input to the data signal line of the electronic paper, as shown in fig. 4, the first level is a high level, the second level is a low level, the first level is 15V, the second level is-15V, and in each period of the excitation phase, a first transition level V1 is set between the first level and the second level, and the first transition level V1 lasts for the first set time T10. As shown in fig. 4, the number of the first transition levels V1 in each period is 6, the number of the first transition levels V1 in each half period is 3, the values of the first transition levels V1 in each period are 7.5V, 0V, -7.5V, respectively, and the number of the first transition levels V1 shown in fig. 4 is only schematic. The values of the high level, the low level and the first transition level shown in fig. 4 are illustrative and are not meant to be specific limitations of the embodiments of the present application.
Illustratively, with continued reference to fig. 4, when the data signal line 100 transits from the high level (15V) to the low level (-15V) during the activation phase, since the first transition level V1 is set, the first transition occurs on the first platform, and the transition amplitude is 7.5V, if the driving device 400 is in the on state, the on-state voltage VGH for driving the driving device 400 to be on is pulled down under the influence of the coupling capacitance, and the normal VGH is 20V, after being pulled down, VGH may be transited to 12.5V, the amplitude of the pulled down may be maximum and may not exceed the transition value (7.5V) of the first transition level V1, and may be lower, after VGH becomes 12.5V, the on-state driving device 400 may not cause the driving device 400 to be off under the effect of VGH, and the state of the driving device 400 may not be changed, and may not cause abnormal display of the pixel. The data signal line 100 continues to transition from 7.5V to 0V, i.e., the second transition level jump occurs, and again from 0V to-7.5V, until the transition is-15V and from 15V to-15V, a total of four jumps occur, and the first 3 jumps are maintained for the first set time T10. Since each transition of the first transition level V1 lasts for the first set time T10, the pulling of the driving voltage caused by the coupling capacitance generated by each level transition is recovered within the first set time, and therefore, the starting point of the pulling of the driving voltage at each level transition is the same, and therefore, the state of the driving device is not changed at each level transition. Illustratively, when the level of the data signal line jumps from 15V to 7.5V, the on-state voltage VGH of the scan signal line is pulled down from 20V to 12.5V (in the case of the maximum pulling amplitude), and during the period that the level of the data signal line is 7.5V for the first set time T10, the coupling capacitance between the data signal line and the scan signal line due to the level jump gradually discharges and disappears, and therefore, the on-state voltage VGH of the scan signal line is restored from 12.5V to 20V. When the level of the data signal line changes from 7.5V to 0V, the on voltage VGH is pulled up to 20V, and the previous offset is restored and does not accumulate to the next offset.
With continued reference to fig. 4, when the data signal line 100 is shifted from a low level (-15V) to a high level (15V) during the activation phase, due to the setting of the first transition level V1, a first shift occurs on the first platform to-7.5V, if the driving device 400 is in the off state, the off-state voltage VGL for driving the driving device 400 to be off is pulled up under the influence of the coupling capacitor, the normal VGL is-20V, after being pulled up, the VGL is usually-12.5V, the amplitude of the pulled up does not exceed 7.5V, and after the VGL is changed to-12.5V, the driving device 400 in the off state does not become on, the state of the driving device 400 does not change, no leakage occurs, and further, no abnormal pixel display occurs. According to the driving method of the electronic paper, the level conversion speed of the data signal line in the excitation stage can be delayed by setting the first transition level, the capacitance value of the coupling capacitor is reduced, the amplitude value of the pulled driving voltage of the driving device is reduced, the state change of the driving device cannot be caused, and the problem that the display effect of the electronic paper is influenced because the Crosstalk of a display picture is easily caused by frequent switching of high and low levels on the data signal line in the activation stage of the existing driving method can be solved.
It should be noted that, in the excitation phase, the number of the first transition levels in each half period may be 1, 2, 5, and the like, and the embodiment of the present application is not limited in particular.
According to the driving method of the electronic paper, in an excitation stage of driving the electronic paper, according to a first set frequency, a first level and a second level are alternately input to a data signal line of the electronic paper, the first level is larger than the second level, in each period of the excitation stage, a first transition level is arranged between the first level and the second level, and the first transition level lasts for a first set time. By setting the first transition level and continuing the transition level for the first set time, the conversion speed of the first level and the second level of the data signal line in the excitation phase can be delayed, and the difference value of the first level conversion is reduced, so that the capacitance value of the coupling capacitor is reduced, the amplitude of the pulled driving voltage of the driving device is reduced, the state change of the driving device can be avoided, and the problem that the frequent switching of the high level and the low level on the data signal line easily causes the Crosstalk of a display picture and influences the display effect of the electronic paper in the activation phase of the existing driving method can be solved.
In some embodiments, before the step S100, the method may further include:
the number of first transition levels in each period of the excitation phase is determined based on the difference between the first level and the second level. The difference between the first level and the second level, that is, the maximum voltage difference of the data signal line during the high-low level transition in the activation phase, may have a difference in design between the high-low level voltage difference in the activation phase used in the driving circuits of different electronic papers. In order to ensure that the high-low level conversion of the data signal line does not cause the state change of the driving device in the excitation stage, the larger the high-low level voltage difference in the excitation stage is, the larger the number of the first transition levels needs to be set, and the smaller the high-low level voltage difference in the excitation stage is, the smaller the number of the first transition levels needs to be set.
The electronic paper driving method determines the number of the first transition levels in each period of the driving stage according to the difference value of the first level and the second level, can set the number of the first transition levels according to the setting of the driving circuits of different electronic papers so as to provide a differentiated driving scheme, further ensures that the driving stage of driving a data signal line cannot cause the change of the state of a driving device, further avoids the occurrence of Crosstalk of a display picture, and improves the display effect of the electronic paper.
In some embodiments, the step of determining the number of first transition levels in each period of the excitation phase based on the difference between the first level and the second level may comprise:
a minimum on voltage and a maximum off voltage input by a scanning signal line of the electronic paper are determined, wherein the minimum on voltage is a minimum voltage for driving a gate electrode of a driving device of the electronic paper to be on, and the maximum off voltage is a maximum voltage for driving the gate electrode of the driving device to be off. The minimum on voltage and the maximum off voltage input by the scanning signal line of the electronic paper can be determined through a plurality of experiments. Illustratively, in an activation phase of driving the electronic paper, different high levels and different low levels are respectively input to the scanning signal lines, and whether or not Crosstalk occurs in the display screen of the electronic paper is observed. The operation of inputting a high level to the scan signal line may be referred to as an external sink VGH, and the operation of inputting a low level to the scan signal line may be referred to as an external sink VGL. Specifically, the experimental data and the experimental results of the externally-charged VGH and the externally-charged VGL are shown in table 1, and table 1 shows the experimental data and the experimental results of the externally-charged VGH and the externally-charged VGL for testing the driving electronic paper in the excitation stage.
TABLE 1
As can be seen from table 1, when the voltage inputted by the scan signal line is still OK at 10V, and the Crosstalk phenomenon does not occur, the minimum turn-on voltage inputted by the scan signal line of the electronic paper is 10V. When the voltage input by the scanning signal line is at-8V, the display picture is NG, the Crosstalk phenomenon appears on the display picture, when the voltage input by the scanning signal line is at-9V, the display picture is OK, and the Crosstalk phenomenon does not appear on the display picture, the maximum closing voltage input by the scanning signal line of the electronic paper is-8V, and the experimental data and the experimental results shown in the table 1 are only schematic and do not serve as specific limitations of the embodiment of the application.
The number and value of the first transition levels in each period of the activation phase are determined based on the difference between the first level and the second level and the minimum on voltage and the maximum off voltage inputted from the scanning signal line. When the difference value between the first level and the second level is considered, the numerical values of the minimum on-voltage and the maximum off-voltage are also considered, so that the number and the numerical value of the first transition level in each period are determined, crosstalk of a display picture can be avoided to the greatest extent in the excitation stage, and the display effect of the electronic paper is improved.
Illustratively, the first level is 15V, the second level is-15V, the voltage difference of the high-low level conversion in the excitation stage is 30V, the on-state voltage of the input driving device is 20V, and the off-state voltage of the input driving device is-20V. The minimum on-voltage determined by experiments or other methods is 10V, the maximum off-voltage is-8V, the amplitude of the on-voltage of the driving device allowed to be pulled down is 10V, and the amplitude of the off-voltage of the driving device allowed to be pulled up is 12V. Therefore, the number of the first transition levels in each half period (one high-low level change) of the excitation phase may be 1, the number of the first transition levels in each period may be 2, and the value of the first transition level in each period may be 5V and-5V, that is, the level change process of the data signal line in each period includes: 15V → 5V, 5V → 5V, -5V → 15V, -15V → 5V, -5V → 5V, 5V → 15V, in each level jump, the level jump amplitude is 10V, therefore, the pulling amplitude of the driving voltage caused by the coupling capacitance effect does not exceed 10V, the minimum on voltage of the driving device is 10V, and the maximum off voltage is-8V.
According to the driving method of the electronic paper, the number and the value of the first transition level in each period are determined according to the value of the minimum opening voltage and the maximum closing voltage while the difference value between the first level and the second level is based, so that the cross talk of a display picture in an excitation stage can be avoided to the greatest extent, and the display effect of the electronic paper is improved.
In some embodiments, the first set time is a multiple of a voltage shift time of a scanning signal line of the electronic paper, wherein the voltage shift of the scanning signal line is caused by a level of a data signal line alternating between a first level and a second level, the voltage shift time being a duration of the voltage shift of the scanning signal line.
Under the action of the coupling capacitor, the voltage on the scanning signal line is pulled, namely pulled up or pulled down, voltage deviation occurs in the pulling process, and because the coupling capacitor is generated instantly, the voltage deviation of the scanning signal line does not last too long and then returns to a normal value, the next level conversion of the data signal line can be continued only after the voltage of the scanning signal line returns to the normal value, therefore, the first set time for maintaining the first transition level needs to be longer than the voltage deviation time of the scanning signal line, the first set time is a multiple of the voltage deviation time of the scanning signal line of the electronic paper, and the voltage deviation of the current scanning signal line can be ensured to have enough time to recover without influencing or accumulating the level conversion of the next data signal line.
It should be noted that, in the driving method of the electronic paper provided in the present application, by setting the first transition level and the first transition level for the first setting time, the on-state voltage of the scan signal line can still be greater than the minimum on-voltage after being pulled down, and the off-state voltage of the scan signal line can still be less than the maximum off-voltage after being pulled up, so as to ensure that in the excitation stage of driving the data signal line, each level transition does not cause a change in the state of the driving device, thereby avoiding occurrence of Crosstalk in the display screen, and improving the display effect of the electronic paper.
According to the electronic paper driving method, the first set time is multiple times of the voltage offset time of the scanning signal line of the electronic paper, enough time for the voltage offset of the current scanning signal line to recover can be guaranteed, and the level conversion of the next data signal line cannot be influenced or accumulated, so that the situation that the state of a driving device cannot be changed during the excitation stage of driving the data signal line can be guaranteed, the cross talk of a display picture is avoided, and the display effect of the electronic paper is improved.
In some embodiments, each period of the excitation phase includes a voltage rising half period and a voltage falling half period, the first transition level in the voltage rising half period is a rising transition level, the first transition level in the voltage falling half period is a falling transition level, and the voltage offset time includes an off-state voltage offset time and an on-state voltage offset time of the scan signal line.
The first set time corresponding to the rising transition level is 1-5 times of the off-state voltage offset time, and the first set time corresponding to the falling transition level is 1-5 times of the on-state voltage offset time, wherein the off-state voltage is the voltage for closing the gate electrode of the driving device in the electronic paper, and the on-state voltage is the voltage for opening the gate electrode of the driving device in the electronic paper.
Fig. 5 is a schematic timing diagram of a data signal line of an electronic paper in an activation phase according to an embodiment of the present disclosure. As shown in fig. 5, each period F of the excitation phase includes a voltage rising half period F1 and a voltage falling half period F2, a first transition level in the voltage rising half period F1 is a rising transition level, a first setting time for the rising transition level to last is a first rising setting time T11, a first transition level in the voltage falling half period F2 is a falling transition level, a first setting time for the falling transition level to last is a first falling setting time T12, and the voltage offset time includes an off-state voltage offset time and an on-state voltage offset time of the scanning signal line. The off-state voltage shift time is a duration of time for which VGL of the scan signal line is pulled up, and the on-state voltage shift time is a duration of time for which VGH of the scan signal line is pulled down. The off-state voltage offset time may be the same as or different from the off-state voltage offset time, and the first rising setup time T11 and the first falling setup time T12 may be the same as or different from each other, so that the first rising setup time T11 and the first falling setup time T12 can be set separately within one period T of the activation phase.
The first rising setting time T11 corresponding to the rising transition level is 1-5 times of the off-state voltage offset time, and the first falling setting time T12 corresponding to the falling transition level is 1-5 times of the on-state voltage offset time, wherein the off-state voltage is the voltage for closing the gate electrode of the driving device in the electronic paper, and the on-state voltage is the voltage for opening the gate electrode of the driving device in the electronic paper. The first rising set time T11 corresponding to the rising transition level is an off-state voltage offset time multiple, and is at least 1 time at first, otherwise, the transition speed of the first level and the second level of the data signal line in the excitation phase is difficult to delay, if the first rising set time T is more than 5 times, the transition time is lengthened, the maintaining time of the first level and the second level is reduced, and the effect of the excitation phase on the mixing of the small particles is influenced.
According to the driving method of the electronic paper, the first rising setting time T11 and the first falling setting time T12 can be set in a distinguishing mode in one period T of the excitation stage, the first rising setting time T11 corresponding to the rising transition level is 1-5 times of the off-state voltage offset time, and the first falling setting time T12 corresponding to the falling transition level is 1-5 times of the on-state voltage offset time. The duration of the first transition level in the voltage reduction half period F2 is set according to the off-state voltage offset time, the duration of the first transition level in the voltage rise half period F1 is set according to the on-state voltage offset time, the conversion speed of the first level and the second level of the data signal line in the excitation stage can be accurately delayed, the Crosstalk of a display picture in the excitation stage is avoided, and the display effect of the electronic paper is further improved.
In some embodiments, after step S100, the method may further include:
and alternately inputting a first level and a second level to the data signal line according to a second set frequency to form a fast excitation stage for driving the electronic paper, wherein the second set frequency is greater than the first set frequency, and a second transition level is arranged between the first level and the second level in each period of the fast excitation stage and lasts for a second set time.
It should be noted that, when only black and white small balls exist in the electronic paper film, only the excitation phase may be set, and the excitation phase corresponding to the first setting frequency may be regarded as slow excitation as compared to the fast excitation phase. If red pellets exist in the electronic paper film, a fast excitation stage needs to be set, and the fast excitation stage mainly aims at the mixing of the black pellets and the red pellets compared with slow excitation. Because the first transition level is set in the excitation stage, the second transition level is also required to be set in the rapid excitation stage, and the setting of the second transition level can avoid the occurrence of Crosstalk of a display picture in the rapid excitation stage, so that the display effect of the electronic paper is improved.
Fig. 6 is a schematic timing diagram of a data signal line of an electronic paper in a fast activation phase according to an embodiment of the present disclosure. As shown in fig. 6, a second transition level V2 is provided between the first level and the second level for a second set time T20 in each period of the fast activation phase. The second set time for which the second transition level V2 continues during the voltage rising half period of the fast excitation phase is a second rising set time T21, and the second set time for which the second transition level V2 continues during the voltage falling half period of the fast excitation phase is a second falling set time T22. The second rising set time T21 and the second falling set time T22 may be the same or different, and the embodiment of the present application is not particularly limited.
The driving method of the electronic paper provided by the embodiment of the application can be a driving scheme for containing red balls in an electronic paper film by adding the rapid excitation stage, and the second transition level is set in the rapid excitation stage, so that the cross of a display picture can be avoided in the rapid excitation stage, and the display effect of the electronic paper is further improved.
In some embodiments, the number of second transition levels is the same as the number of first transition levels in a single period, and the second set time is different from the first set time.
In the driving method of the electronic paper provided by the embodiment of the application, since the high level and the low level in the fast driving stage are the same as the high level and the low level in the driving stage, the number of the first transition level and the second transition level in a single period may be the same, but since the second setting frequency is greater than the first setting frequency, the refresh in the fast driving stage is faster than the refresh in the driving stage, and thus, the offset time for which the voltage on the scanning signal line is pulled is different, and therefore, the first setting time and the second setting time cannot be the same.
In some embodiments, the number of the first transition levels is three in a half period composed of the adjacent first level and the second level. Referring to fig. 5, the number of the first transition levels is 3 during a voltage rising half period and 3 during a voltage falling half period. The high level used in the excitation stage of the existing electronic paper drive is usually 15V, the low level is usually-15V, the differential pressure of the high level and the low level is 30V, and in each half cycle, the number of the first transition levels is set to be 3, so that the conversion speed of delaying the first level and the second level of a data signal line in the excitation stage can be completely ensured, the effect of delaying the conversion time of the high level and the low level in the excitation stage is better, the Crosstalk of a display picture in the excitation stage is avoided, and the display effect of the electronic paper is further improved.
It should be noted that the voltages and levels mentioned in the present application can be regarded as equivalent concepts, and the present application does not distinguish between them.
In a second aspect of the embodiments of the present application, there is provided an electronic paper, including: an electronic paper screen and an electronic paper driving device; the electronic paper driving device is configured to:
alternately inputting a first level and a second level to a data signal line of the electronic paper at a first set frequency to form an excitation phase for driving the electronic paper, wherein the first level is greater than the second level, and a first transition level is provided between the first level and the second level in each period of the excitation phase, and the first transition level lasts for a first set time.
The driving target of the driving step that the electronic paper driving apparatus is configured to perform is an electronic paper screen in which data signal lines, scanning signal lines, and pixels are provided, where the data signal lines and the scanning signal lines are the data signal lines and the scanning signal lines mentioned in the above embodiments.
The electronic paper provided by the embodiment of the application is driven by applying the driving method provided by the first aspect, in the excitation stage of the electronic paper driving, according to a first set frequency, a first level and a second level are alternately input to a data signal line of the electronic paper, the first level is greater than the second level, in each period of the excitation stage, a first transition level is arranged between the first level and the second level, and the first transition level lasts for a first set time. By setting the first transition level and continuing the transition level for the first set time, the conversion speed of the first level and the second level of the data signal line in the excitation phase can be delayed, and the difference value of the first level conversion is reduced, so that the capacitance value of the coupling capacitor is reduced, the amplitude of the pulled driving voltage of the driving device is reduced, the state change of the driving device can be avoided, and the problem that the frequent switching of the high level and the low level on the data signal line easily causes the Crosstalk of a display picture and influences the display effect of the electronic paper in the activation phase of the existing driving method can be solved.
In a third aspect of the embodiments of the present application, a storage medium is provided, and fig. 8 is a schematic structural block diagram of the storage medium provided in the embodiments of the present application. The storage medium 2000 includes a stored computer program 2100, wherein the apparatus in which the storage medium is located is controlled to perform the driving method of electronic paper according to any one of the first aspect when the computer program 2100 is run.
The driving method of the electronic paper comprises the following steps:
alternately inputting a first level and a second level to a data signal line of the electronic paper at a first set frequency to form an excitation phase for driving the electronic paper, wherein the first level is greater than the second level, and a first transition level is provided between the first level and the second level in each period of the excitation phase, the first transition level lasting for a first set time.
In a fourth aspect of the embodiments of the present application, a display device is provided, and fig. 8 is a schematic structural diagram of the display device provided in the embodiments of the present application. As shown in fig. 8, a display device provided in an embodiment of the present application includes: the electronic paper 1000 according to the second aspect.
The display device provided in the embodiment of the present application may be an electronic book reading tablet, or a display in other applications, and the present application is not limited specifically.
While preferred embodiments of the present specification have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all changes and modifications that fall within the scope of the specification.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present specification without departing from the spirit and scope of the specification. Thus, if such modifications and variations of the present specification fall within the scope of the claims of the present specification and their equivalents, then such modifications and variations are also intended to be included in the present specification.
Claims (9)
1. A method of driving electronic paper, comprising:
alternately inputting a first level and a second level to a data signal line of the electronic paper at a first set frequency to form an excitation phase for driving the electronic paper, wherein the first level is greater than the second level, a first transition level is provided between the first level and the second level in each period of the excitation phase, the first transition level lasts for a first set time, the number and value of the first transition levels are determined according to the difference between the first level and the second level, and the first transition level is greater than the second level and less than the first level.
2. The method for driving electronic paper of claim 1, wherein the step of alternately inputting the first level and the second level to the data signal line of the electronic paper at the first set frequency to form the excitation phase for driving the electronic paper is preceded by the step of:
determining a minimum on-voltage and a maximum off-voltage input by a scanning signal line of the electronic paper, wherein the minimum on-voltage is a minimum voltage for driving a gate electrode of a driving device of the electronic paper to be on, and the maximum off-voltage is a maximum voltage for driving the gate electrode of the driving device to be off;
and determining the number and the value of the first transition level in each period of the excitation phase according to the difference value of the first level and the second level and the minimum on voltage and the maximum off voltage input by the scanning signal line.
3. The electronic paper driving method according to claim 1, wherein the first set time is a multiple of a voltage shift time of a scanning signal line of the electronic paper, wherein the voltage shift of the scanning signal line is caused by the level of the data signal line alternating between the first level and the second level, the voltage shift time being a duration of the scanning signal line voltage shift.
4. The electronic paper driving method according to claim 3, wherein each period of the excitation phase includes a voltage rising half period and a voltage falling half period, the first transition level in the voltage rising half period is a rising transition level, the first transition level in the voltage falling half period is a falling transition level, and the voltage shift time includes an off-state voltage shift time and an on-state voltage shift time of the scanning signal line;
the first set time corresponding to the rising transition level is 1-5 times of the off-state voltage shift time, and the first set time corresponding to the falling transition level is 1-5 times of the on-state voltage shift time, wherein the off-state voltage is a voltage at which a gate electrode of a driving device in the electronic paper is turned off, and the on-state voltage is a voltage at which the gate electrode of the driving device in the electronic paper is turned on.
5. The method for driving electronic paper according to claim 1, wherein the step of alternately inputting the first level and the second level to the data signal line of the electronic paper at the first set frequency to form the excitation phase for driving the electronic paper further comprises:
and alternately inputting the first level and the second level to the data signal line according to a second set frequency to form a rapid excitation stage for driving the electronic paper, wherein the second set frequency is greater than the first set frequency, and a second transition level is arranged between the first level and the second level in each period of the rapid excitation stage and lasts for a second set time.
6. The electronic paper driving method according to claim 5, wherein the number of the second transition levels is the same as the number of the first transition levels in a single period, and the second set time is different from the first set time.
7. The electronic paper driving method according to claim 1, wherein the number of the first transition levels is three in a half period composed of the first level and the second level which are adjacent to each other.
8. An electronic paper, comprising: an electronic paper screen and an electronic paper driving device;
the electronic paper driving apparatus is configured to:
alternately inputting a first level and a second level to a data signal line of the electronic paper at a first set frequency to form an excitation phase for driving the electronic paper, wherein the first level is greater than the second level, a first transition level is provided between the first level and the second level in each period of the excitation phase, the first transition level lasts for a first set time, the number and value of the first transition levels are determined according to the difference between the first level and the second level, and the first transition level is greater than the second level and less than the first level.
9. A storage medium characterized by comprising a stored computer program, wherein the apparatus in which the storage medium is located is controlled to execute the driving method of electronic paper according to any one of claims 1 to 7 when the computer program is run.
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