CN113870803B - Electronic paper display device and driving method thereof - Google Patents
Electronic paper display device and driving method thereof Download PDFInfo
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- CN113870803B CN113870803B CN202111208251.5A CN202111208251A CN113870803B CN 113870803 B CN113870803 B CN 113870803B CN 202111208251 A CN202111208251 A CN 202111208251A CN 113870803 B CN113870803 B CN 113870803B
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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
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
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Abstract
The application discloses an electronic paper display device and a driving method thereof. The driving method of the electronic paper display device provided by the embodiment of the application comprises the following steps: according to an image to be displayed, in a pre-charging stage, applying a driving signal corresponding to the sub-pixel row of the (N-1) th row to a second electrode in the sub-pixel row of the Nth row; wherein N is an integer greater than 1; according to an image to be displayed, in a charging stage after a pre-charging stage, applying a driving signal corresponding to the sub-pixel row in the Nth row to the second electrode in the sub-pixel row in the Nth row; the voltage value of the drive signal is not zero during the charging phase.
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, and a first electrode and a second electrode which are arranged on two opposite sides of each microcup, wherein 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. The conventional waveform design of black, white and red electronic paper is not pre-charged. When there is precharge, for example, when the previous row of red picture is displayed, and the next row of white picture is displayed, after the white picture is written, only 0 v electrons can be written into the white picture after precharge, and the white charged particles can not be driven any more. However, due to the pre-charge, the red picture in the previous row is written into the picture in the current row, resulting in red-colored white picture. Namely, the pre-charging will cause the image to be disordered and affect 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 avoiding picture disorder caused by pre-charging.
An embodiment of the application provides a driving method of an electronic paper display device, and the electronic paper display device includes: a plurality of rows of subpixels; the sub-pixel row comprises a plurality of sub-pixels; and (3) sub-pixel: the display device comprises a microstructure, a first electrode and a second electrode, wherein the first electrode is positioned on the display side of the microstructure, which is close to the electronic paper display device, and the second electrode is positioned on the microstructure, which is far away from the display side; the microstructure includes: first, second, and third color charged particles; the method comprises the following steps:
according to an image to be displayed, in a pre-charging stage, applying a driving signal corresponding to the sub-pixel row of the (N-1) th row to a second electrode in the sub-pixel row of the Nth row; wherein N is an integer greater than 1;
according to an image to be displayed, in a charging stage after a pre-charging stage, applying a driving signal corresponding to the sub-pixel row of the Nth row to the second electrode in the sub-pixel row of the Nth row; the voltage value of the drive signal is not zero during the charging phase.
In some embodiments, according to an image to be displayed, in a charging stage after the pre-charging stage, applying a driving signal corresponding to the nth row of sub-pixel rows to the second electrodes in the nth row of sub-pixel rows specifically includes:
applying a first driving signal to the second electrode in a case where the sub-pixel displays the first color; the first drive signal includes: a first level signal applied during a charging phase; the first level signal is used for: the first color charged particles are brought close to the display side of the electronic paper display device.
In some embodiments, according to an image to be displayed, in a charging phase after the pre-charging phase, applying a driving signal corresponding to the nth row of sub-pixel rows to the second electrodes in the nth row of sub-pixel rows, further includes:
applying a second driving signal to the second electrode in a case where the sub-pixel displays a second color; the second drive signal includes: a second level signal applied during a charging phase; the second 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, according to an image to be displayed, in a charging phase after the pre-charging phase, applying a driving signal corresponding to the nth row of sub-pixel rows to the second electrodes in the nth row of sub-pixel rows, further includes:
in the case where the sub-pixel displays the third color, a third driving signal is applied to the second electrode; the third driving signal comprises a third level signal and a fourth level signal which are sequentially applied in a charging stage; the third level signal is used for: pulling the first color charged particles away from the display side; the fourth level signal is used for: the third color charged particles are brought close to the display side of the electronic paper display device.
In some embodiments, the start time of the charging phase is the same as the start time of the third level signal, and the duration of the third level signal is the same as the duration of the precharge phase.
In some embodiments, the third drive signal comprises a plurality of pulse units during the write phase; the pulse unit comprises a third level signal and a fourth level signal which are applied in sequence;
the starting time of the charging phase is the same as the starting time of the third level signal in the first pulse unit, and the ending time of the charging phase is the same as the ending time of the fourth level signal in the first pulse unit.
In some embodiments, the first level signal and the fourth level signal are electrically the same, and the absolute voltage value of the first level signal is greater than the absolute voltage value of the fourth level signal;
the electrical property of the second level signal and the electrical property of the third level signal are opposite to the electrical property of the first level signal;
the voltage absolute value of the fourth level signal is smaller than that of the third level signal;
the absolute value of the voltage of the second level signal is equal to the absolute value of the voltage of the third level signal.
In some embodiments, the precharge phase duration is greater than or equal to 0.1H and less than or equal to 0.2H, where H is the charge phase duration.
An electronic paper display device that this application embodiment provided, electronic paper display device includes: a plurality of rows of subpixels; the sub-pixel row comprises a plurality of sub-pixels; and (3) sub-pixel: the display device comprises a microstructure, a first electrode and a second electrode, wherein the first electrode is positioned on the display side of the microstructure, which is close to the electronic paper display device, and the second electrode is positioned on the microstructure, which is far away from the display side; the microstructure includes: the first color charged particle, second color charged particle, and third color charged particle electronic paper display device 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 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.
The electronic paper display device and the driving method thereof provided by the embodiment of the application are provided with the pre-charging stage, so that the charging duration of the sub-pixels can be ensured, the sub-pixels are effectively charged, and the second electrodes in the sub-pixels can be ensured to reach correct voltage. In addition, because the voltage value of the driving signal applied by the second electrode in the nth row of sub-pixel rows is not zero in the charging stage after the pre-charging stage, even if the driving signal of the previous row of sub-pixels is written into the nth row of sub-pixels in the pre-charging stage, the driving signal with the non-zero voltage value can still drive the nth row of sub-pixels to display the corresponding color, so that the nth row of sub-pixels is prevented from displaying the color of the (N-1) th row of sub-pixel rows, thereby avoiding the disorder of pictures, improving the display effect and improving the user experience.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required 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 without creative efforts.
Fig. 1 is a schematic view of an electronic paper display device according to an embodiment of the present disclosure;
fig. 2 is a schematic cross-sectional structure diagram of an electronic paper display device according to an embodiment of the present disclosure;
fig. 3 is a schematic 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 illustrating a driving method of an electronic paper display device according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram illustrating movement of charged particles in a driving method of an electronic paper display device according to an embodiment of the present disclosure;
fig. 6 is a waveform diagram of a pre-charging phase and a charging phase of a driving method of an electronic paper display device according to an embodiment of the present application;
fig. 7 is a schematic diagram illustrating movement of charged particles in another driving method of an electronic paper display device according to an embodiment of the present disclosure;
fig. 8 is a waveform diagram of a pre-charging phase and a charging phase of another driving method of an electronic paper display device according to an embodiment of the application;
fig. 9 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 of the 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.
As shown in fig. 1 and 2, an electronic paper display device provided in an embodiment of the present application includes: a plurality of sub-pixel rows 9; the sub-pixel row 9 comprises a plurality of sub-pixels 10; the sub-pixel 10: the electronic paper display device comprises a microstructure 1, a first electrode 2 positioned on the display side of the microstructure 1 close to the electronic paper display device, and a second electrode 3 positioned on the side of the microstructure 2 away from the display side; the microstructure 1 includes: first color charged particles 4, second color charged particles 5, and third color charged particles 6; 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.
In some embodiments, as shown in fig. 1, a plurality of sub-pixel rows 9 extend along the first direction X and are arranged along the second direction Y. The plurality of sub-pixels 10 in each sub-pixel row 9 are arranged along the first direction X. The first direction X intersects the second direction Y. The first direction X and the second direction Y are perpendicular to each other in fig. 1 for example. I.e. a plurality of sub-pixels 10 arranged in an array in an electronic paper display device. The plurality of sub-pixels 10 in the electronic paper display device may be further divided into a plurality of sub-pixel columns, the plurality of sub-pixel columns are arranged along the first direction X and extend along the second direction Y, and the plurality of sub-pixels 10 in each sub-pixel column are arranged along the second direction Y.
In some embodiments, as shown in fig. 1, the electronic paper display device further includes: a plurality of scanning lines 11 and a plurality of data lines 12 crossing in the horizontal and vertical directions, and a plurality of transistors 13. The plurality of scan lines 11 and the plurality of data lines 12 divide the area of the plurality of sub-pixels 10.
In some embodiments, as shown in fig. 1, the scan lines 11 correspond to the sub-pixel rows 10 one to one. The data lines correspond to the sub-pixel columns one to one. The transistors 13 correspond one-to-one to the sub-pixels 10. The data lines correspond to the sub-pixel columns one to one.
In a specific implementation, the control electrode of the transistor is electrically connected with the scanning signal line, the first electrode of the transistor is electrically connected with the data signal line, and the second electrode of the transistor is electrically connected with the second electrode. When the scanning signal input by the scanning signal line controls the transistor to be switched on, the transistor provides a driving signal of data line data to the second electrode so as to control the sub-pixel to display the required color.
In some embodiments, the transistor may be a thin film transistor, for example.
In some embodiments, as shown in fig. 2, the electronic paper display device further includes a substrate base plate 7 and a cover plate 8.
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. 2, the first electrodes 2 in the plurality of sub-pixels 10 may be integrally connected. That is, the first electrode is a planar electrode covering the plurality of sub-pixel regions. In this case, the voltage signals applied to the first electrodes are the same.
Of course, in some embodiments, the first electrodes in the plurality of sub-pixels may also be unconnected to each other. In this case, the voltage signals applied to the first electrodes in the plurality of sub-pixels may be the same or different.
When the voltage signals applied to the first electrodes in the plurality of sub-pixels 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. 3, the driving method includes:
s101, according to an image to be displayed, in a pre-charging stage, applying a driving signal corresponding to an N-1 th row of sub-pixel rows to second electrodes in the N-1 th row of sub-pixel rows; wherein N is an integer greater than 1;
s102, according to an image to be displayed, in a charging stage after a pre-charging stage, applying a driving signal corresponding to the sub-pixel row in the Nth row to the second electrode in the sub-pixel row in the Nth row; the voltage value of the drive signal is not zero during the charging phase.
The pre-charging stage is a stage of charging the sub-pixels in the nth row in advance, and the driving signals of the sub-pixel row in the N-1 th row are charged to the sub-pixel row in the nth row in the pre-charging stage.
The driving method of the electronic paper display device provided by the embodiment of the application is provided with the pre-charging stage, so that the charging duration of the sub-pixels can be ensured, the sub-pixels are effectively charged, and the second electrodes in the sub-pixels can be ensured to reach correct voltage. In addition, because the voltage value of the driving signal applied by the second electrode in the nth row of sub-pixels in the charging stage after the pre-charging stage is not zero, even if the nth row of sub-pixels is written with the driving signal of the previous row of sub-pixels in the pre-charging stage, the driving signal with the non-zero voltage value can still drive the nth row of sub-pixels to display the corresponding color, and the nth row of sub-pixels is prevented from displaying the color of the nth-1 th row of sub-pixels, so that the disorder of pictures can be avoided, the display effect is improved, and the user experience is improved.
In some embodiments, according to an image to be displayed, in a charging stage after the pre-charging stage, applying a driving signal corresponding to the nth row of sub-pixel rows to the second electrodes in the nth row of sub-pixel rows specifically includes:
applying a first driving signal to the second electrode in a case where the sub-pixel displays the first color; as shown in fig. 4, the first drive signal T1 includes: a first level signal V1 applied during a charging phase; the first level signal V1 is used to: the first color charged particles are brought close to the display side of the electronic paper display device.
In some embodiments, according to the image to be displayed, in a charging phase after the pre-charging phase, applying the driving signal corresponding to the nth row of sub-pixel rows to the second electrodes in the nth row of sub-pixel rows, further includes:
applying a second driving signal to the second electrode in a case where the sub-pixel displays a second color; as shown in fig. 4, the second drive signal T2 includes: a second level signal V2 applied during the charging phase; the second level signal V2 is used for: the second color charged particles are brought close to the display side of the electronic paper display device.
In some embodiments, according to an image to be displayed, in a charging phase after the pre-charging phase, applying a driving signal corresponding to the nth row of sub-pixel rows to the second electrodes in the nth row of sub-pixel rows, further includes:
in the case where the sub-pixel displays the third color, a third driving signal is applied to the second electrode; as shown in fig. 4, the third driving signal T3 includes a third level signal V3 and a fourth level signal V4 which are sequentially applied in the charging phase; the third level signal V3 is used to: pulling the first color charged particles away from the display side; the fourth level signal V4 is used to: the third color charged particles are brought close to the display side of the electronic paper display device.
In some embodiments, as shown in FIG. 4, the start time t1 of the charging phase is the same as the start time t1 of the third level signal V3, and the duration t2-t1 of the third level signal V3 is the same as the duration of the pre-charging phase.
It should be noted that the duration of the third level signal V3 in the charging phase may be referred to as a balancing phase, which is used to balance the position of the charged particles of the first color.
In some embodiments, as shown in fig. 4, the third driving signal T3 includes a plurality of pulse units Z during the writing phase; the pulse unit Z comprises a third level signal V3 and a fourth level signal V4 which are applied in sequence;
the starting time T1 of the charging phase is the same as the starting time of the third level signal T3 in the first pulse unit Z, and the ending time T3 of the charging phase is the same as the ending time T3 of the fourth level signal V4 in the first pulse unit Z.
In some embodiments, as shown in fig. 4, in the writing phase, the starting time of the first level signal V1 in the first driving signal T1 is the same as the starting time T1 of the charging phase, and in the writing phase, the duration of the first level signal V1 in the first driving signal T1 is longer than the duration of the charging phase.
In some embodiments, as shown in fig. 4, in the writing phase, the starting time of the second level signal V2 in the second driving signal T2 is the same as the starting time T1 of the charging phase, and in the writing phase, the duration of the second level signal V2 in the second driving signal T2 is longer than the duration of the charging phase.
In some embodiments, as shown in FIG. 4, the duration of the first level signal V1 in the first driving signal T1 during the writing phase is equal to the duration of the second level signal V2 in the second driving signal T2 during the writing phase, and the duration of the first level signal V1 in the first driving signal T1 during the writing phase is equal to the duration of the plurality of pulse units Z in the third driving signal T3 during the writing phase.
In some embodiments, the first level signal and the fourth level signal are electrically the same, and the absolute voltage value of the first level signal is greater than the absolute voltage value of the fourth level signal;
the electrical property of the second level signal and the electrical property of the third level signal are opposite to the electrical property of the first level signal;
the voltage absolute value of the fourth level signal is smaller than that of the third level signal;
the absolute value of the voltage of the second level signal is equal to the absolute value of the voltage of the third level signal.
In some embodiments, the first color charged particles and the third color charged particles are positively charged, the second color charged particles are negatively charged, the first level signal is 15 volts (V), the second level signal and the third level signal are-15V, and the fourth level signal is 6V.
In some embodiments, the precharge phase duration is greater than or equal to 0.1H and less than or equal to 0.2H, where H is the charge phase duration. H =1/f/a, f is the refresh frequency, and a is the number of rows of subpixels.
In some embodiments, as shown in fig. 4, the first driving signal T1 further includes zero-voltage signals before and after the first level signal V1 in the writing phase. In the writing phase, the second driving signal T2 further includes zero voltage signals before and after the second level signal V2. In the writing phase, the third driving signal T3 further includes: the fourth level signal and the third level signal, and the zero voltage signal, which are sequentially applied before the plurality of pulse units Z.
In the writing stage, when a fourth level signal is applied to the second electrode in the sub-pixel that needs to display the third color, the first color charged particles will also move to the display side, and therefore the third level signal needs to be applied to the second electrode. Because the charge-to-mass ratio of the first color charged particles is greater than that of the third color charged particles, when a third 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, the distance between the first color charged particles and the third color charged particles can be increased while the first color charged particles are pulled to move away from the display side, and the third color picture is prevented from deviating to the first color.
In some embodiments, the driving method further comprises:
and supplying a scanning signal to the scanning line to control the transistors in each sub-pixel row to be turned on row by row.
Next, 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. The first color charged particles and the third color charged particles are positively charged, and the second color charged particles are negatively charged. The specific relationship that the colors of the sub-pixels in the (N-1) th row are different before the display colors of the sub-pixels in the (N) th row are different after the display colors of the sub-pixels in the (N) th row is as follows: black red, white red, black and white, red black, white black.
Next, taking the waveform shown in fig. 4 as an example, the case where the colors of the sub-pixels in adjacent rows are different will be described as follows:
1. black-red case:
the motion of the charged particles is shown in fig. 5, and the actual waveforms of the N-th row of sub-pixels in the pre-charging phase and the charging phase are shown in fig. 6;
according to the waveform diagram corresponding to the black, white and red frames shown in fig. 4, when the N-th row of sub-pixels needs to display red, and the black-and-white waveform is not yet written, the red charged particles in the N-th row of sub-pixels push to the top of the microstructure close to the display side, i.e. the N-th row of sub-pixels preferentially write red. After the driving signal voltage of the black picture of the sub-pixel row of the N-1 th row is 15V and the writing is started:
in the AB phase, because of the existence of pre-charging, the voltage of 15V pushes the black charged particles to the display side in the sub-pixels of the Nth row;
at the BC stage, writing-15V voltage into the sub-pixels at the Nth row for balancing the charged black particles, and pulling the charged black particles down to the position before the 15V voltage is not written, and simultaneously, pulling the charged red particles down;
and in the CD stage, 6V voltage is written into the sub-pixels in the Nth row, the red charged particles are pushed to the top of the microstructure, and the sub-pixels in the Nth row finally display red.
2. White and red conditions: the motion of the charged particles is shown in fig. 7, and the actual waveforms of the N-th row of sub-pixels in the pre-charging phase and the charging phase are shown in fig. 8;
according to the waveform diagram corresponding to the black, white and red frames shown in fig. 4, when the N-th row of sub-pixels needs to display red, and the black-and-white waveform is not yet written, the red charged particles in the N-th row of sub-pixels push to the top of the microstructure close to the display side, i.e. the N-th row of sub-pixels preferentially write red. After the writing is started when the driving signal voltage of the white picture of the sub-pixel row of the N-1 th row is-15V:
an AB phase, in which a voltage of-15V pushes up the white charged particles in the present row due to the pre-charge;
in the BC stage, a voltage of-15V is written into the sub-pixels in the Nth row, the white charged particles are pushed upwards, the black charged particles are pulled downwards, and the red charged particles are pulled downwards;
and in the CD stage, 6V voltage is written into the sub-pixels in the Nth row, the white charged particles are pulled downwards and pushed to the top of the microstructure, and the sub-pixels in the Nth row finally display red.
3. Black and white case:
when the N-th row of sub-pixels in the pre-charging stage writes a first driving signal corresponding to a black picture, and when the N-th row of sub-pixels in the charging stage actually writes a second driving signal corresponding to a white picture, because the electric properties of the black charged particles and the white charged particles are opposite, and the charge-to-mass ratio of the black charged particles and the white charged particles is equivalent, the second level signal in the charging stage drives the white charged particles to move towards the display side and simultaneously drives the black charged particles to move towards the far side, the influence of the pre-charging on the writing of the white picture is small, and the N-th row of sub-pixels finally display white.
4. White and black conditions:
when the second driving signal corresponding to the white picture is written into the nth row of sub-pixels in the pre-charging stage, and the first driving signal corresponding to the black picture is actually written into the nth row of sub-pixels in the charging stage, because the black charged particles and the white charged particles have opposite electrical properties and the charge-to-mass ratio of the black charged particles and the white charged particles is equivalent, the white charged particles are driven to move away from the display side while the black charged particles are driven to move towards the display side by the first level signal in the charging stage, the influence of the pre-charging on the writing of the black picture is small, and the nth row of sub-pixels finally display black.
5. Red and white conditions:
when the N-th row of sub-pixels in the pre-charging stage writes a third driving signal corresponding to a red picture, and the N-th row of sub-pixels in the charging stage actually writes a second driving signal corresponding to a white picture, the second level signal in the charging stage drives the white charged particles to move towards the display side and drives the red charged particles to move away from the display side at the same time as the red charged particles and the white charged particles are opposite in electrical property, so that the influence of pre-charging on writing of the white picture is small, and the N-th row of sub-pixels finally display white.
6. Red and black conditions:
when the N-th row of sub-pixels in the pre-charging stage writes in a third driving signal corresponding to a red picture and the N-th row of sub-pixels in the charging stage actually writes in a second driving signal corresponding to a black picture, the charged-to-mass ratio of the red charged particles is smaller than that of the black charged particles, so that the black charged particles move to the display side at a high speed, the red charged particles are squeezed out, and the N-th row of sub-pixels finally display black.
In fig. 6 and 8, the GATE signal is a scan signal input to the scan line. Fig. 6 and 8 illustrate an example in which the transistor is turned on when the GATE signal is high.
In some embodiments, as shown in fig. 9, the first driving signal T1, the second driving signal T2, and the third driving signal T3 further include: the reverse phase and the dither phase. The balancing phase includes a first inversion phase and a second inversion phase, and the dithering phase includes a first dithering phase and a second dithering phase. In the first inversion 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. The second inversion 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 stage, the first driving signal T1, the second driving signal T2, and the third driving signal T3 include a positive voltage signal and a negative voltage signal which are 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 stage, the first driving signal T1, the second driving signal T2 and the third driving signal T3 include a positive voltage signal and a negative voltage signal which are alternately applied at a fast speed, and are used for: the third color charged particles are separated from the first color charged particles.
An electronic paper display device that this application embodiment provided, electronic paper display device includes: a plurality of rows of subpixels; the sub-pixel row comprises a plurality of sub-pixels; and (3) sub-pixel: the display device comprises a microstructure, a first electrode and a second electrode, wherein the first electrode is positioned on the display side of the microstructure, which is close to the electronic paper display device, and the second electrode is positioned on the microstructure, which is far away from the display side; the microstructure includes: the first color charged particle, second color charged particle, and third color charged particle electronic paper display device 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 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.
The display device provided by the embodiment of the application is as follows: a tablet reader, etc. 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, the electronic paper display device and the driving method thereof provided by the embodiment of the application are provided with the pre-charging stage, so that the charging duration of the sub-pixels can be ensured, the sub-pixels can be effectively charged, and the second electrodes in the sub-pixels can be ensured to reach the correct voltage. In addition, because the voltage value of the driving signal applied by the second electrode in the nth row of sub-pixels in the charging stage after the pre-charging stage is not zero, even if the nth row of sub-pixels is written with the driving signal of the previous row of sub-pixels in the pre-charging stage, the driving signal with the non-zero voltage value can still drive the nth row of sub-pixels to display the corresponding color, and the nth row of sub-pixels is prevented from displaying the color of the nth-1 th row of sub-pixels, so that the disorder of pictures can be avoided, the display effect is improved, and the user experience is 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 rows of subpixels; the subpixel row comprises a plurality of subpixels; the sub-pixel: the electronic paper display device comprises a microstructure, a first electrode and a second electrode, wherein the first electrode is positioned on the display side of the microstructure, which is close to the electronic paper display device, and the second electrode is positioned on the microstructure, which is far away from the display side; the microstructure includes: first, second, and third color charged particles; characterized in that the method comprises:
according to an image to be displayed, in a pre-charging stage, applying a driving signal corresponding to the sub-pixel row of the (N-1) th row to the second electrode in the sub-pixel row of the Nth row; wherein N is an integer greater than 1;
according to an image to be displayed, in a charging stage after the pre-charging stage, applying a driving signal corresponding to the sub-pixel row in the Nth row to the second electrode in the sub-pixel row in the Nth row; the voltage value of the driving signal is not zero during the charging phase.
2. The method according to claim 1, wherein, according to the image to be displayed, in a charging phase after the pre-charging phase, applying the driving signal corresponding to the sub-pixel row in the nth row to the second electrode in the nth row of sub-pixel rows specifically comprises:
applying a first drive signal to the second electrode in a case where the sub-pixel displays a first color; the first drive signal includes: a first level signal applied during the charging phase; the first level signal is used for: bringing the first color charged particles close to a display side of the electronic paper display device.
3. The method according to claim 2, wherein the driving signal corresponding to the nth row of sub-pixel rows is applied to the second electrode in the nth row of sub-pixel rows in a charging phase after the pre-charging phase according to the image to be displayed, further comprising:
applying a second drive signal to the second electrode in a case where the sub-pixel displays a second color; the second drive signal includes: a second level signal applied during the charging phase; the second level signal is used for: bringing the second color charged particles close to a display side of the electronic paper display device.
4. The method of claim 3, wherein the driving signals corresponding to the N row of sub-pixel rows are applied to the second electrodes in the N row of sub-pixel rows in a charging phase after the pre-charging phase according to the image to be displayed, further comprising:
in the case where the sub-pixel displays a third color, applying a third driving signal to the second electrode; the third driving signal comprises a third level signal and a fourth level signal which are sequentially applied in a charging stage; the third level signal is used for: pulling the first color charged particles away from the display side; the fourth level signal is used for: bringing the third color charged particles close to a display side of the electronic paper display device.
5. The method of claim 4, wherein the start of the charging phase is the same as the start of the third level signal, and wherein the duration of the third level signal is the same as the duration of the pre-charging phase.
6. The method of claim 5, wherein the third driving signal comprises a plurality of pulse units during a write phase; the pulse unit comprises the third level signal and the fourth level signal which are applied in sequence;
the starting time of the charging phase is the same as the starting time of the third level signal in the first pulse unit, and the ending time of the charging phase is the same as the ending time of the fourth level signal in the first pulse unit.
7. The method of claim 4, wherein the first level signal and the fourth level signal are electrically the same, and the absolute voltage of the first level signal is greater than the absolute voltage of the fourth level signal;
the electrical property of the second level signal and the electrical property of the third level signal are opposite to the electrical property of the first level signal;
the voltage absolute value of the fourth level signal is smaller than that of the third level signal;
the voltage absolute value of the second level signal is equal to the voltage absolute value of the third level signal.
8. The method of any one of claims 1-7, wherein the duration of the pre-charge phase is greater than or equal to 0.1H and less than or equal to 0.2H, where H is the duration of the charge phase.
9. An electronic paper display device, comprising: a plurality of sub-pixel rows; the subpixel row comprises a plurality of subpixels; the sub-pixel: the electronic paper display device comprises a microstructure, a first electrode and a second electrode, wherein the first electrode is positioned on the display side of the microstructure, which is close to the electronic paper display device, and the second electrode is positioned on the microstructure, which is far away from the display side; the microstructure includes: first, second, and third color charged particles; characterized in that, the electronic paper display device still includes: a processor; the processor is configured to drive the electronic paper display device using 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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