CN113534989A - Electronic paper display and driving method thereof - Google Patents

Electronic paper display and driving method thereof Download PDF

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Publication number
CN113534989A
CN113534989A CN202010290875.5A CN202010290875A CN113534989A CN 113534989 A CN113534989 A CN 113534989A CN 202010290875 A CN202010290875 A CN 202010290875A CN 113534989 A CN113534989 A CN 113534989A
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China
Prior art keywords
touch
electronic paper
paper display
display panel
color
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Granted
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CN202010290875.5A
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Chinese (zh)
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CN113534989B (en
Inventor
柳文斌
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E Ink Holdings Inc
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E Ink Holdings Inc
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices

Abstract

The invention provides an electronic paper display and a driving method thereof. The electronic paper display comprises an electronic paper display panel, a touch panel and a processing circuit. The electronic paper display panel is used for displaying a display picture with a first color as a background. The touch panel and the electronic paper display panel are integrated and used for outputting a first touch coordinate of current touch. The processing circuit is used for driving the electronic paper display panel to display a first touch track which has a second color and corresponds to the position between the first touch coordinate and the previous touch coordinate. The processing circuit further drives the electronic paper display panel to display a predicted track with a third color according to the first touch track and the previous touch track.

Description

Electronic paper display and driving method thereof
Technical Field
The present invention relates to a display technology, and more particularly, to an electronic paper display and a driving method thereof.
Background
The electronic paper display is a novel display device, has the advantages of being light, thin, durable, energy-saving, environment-friendly, low in power consumption and the like, and is widely applied to electronic readers (e.g., electronic books and electronic newspapers) or other electronic components (e.g., electronic tags) in the market.
In some applications, the functions of the electronic paper display panel and the touch panel are integrated, so that a user can achieve the effects of touch control and displaying a touch control result through the electronic paper display. For example, a user may utilize a touch medium (e.g., a stylus or finger) to write on the touch panel to display the written content on the display panel. It should be noted that, in the prior art, the touch trajectory of the touch media on the touch panel at the next time point is usually predicted according to the previous touch trajectory at the previous time point, so as to display the line segment drawn by the touch media in advance, thereby reducing the writing delay time.
On the other hand, on the premise that the display panel uses white as the display background, the conventional electronic paper display displays the predicted touch trajectory in the display panel in a manner of representing a black line segment. And when the predicted touch track is different from the actual touch track, the displayed predicted touch track is further converted into white.
However, in the process of converting the mispredicted touch trajectory from black to white, it takes a long processing time for the characteristics of the electronic paper display panel. Moreover, if the predicted touch trajectory is displayed on the display panel in a black representation, the viewing quality of the user may be affected. Therefore, how to effectively reduce the time for processing the predicted incorrect touch trajectory and improve the display quality of the display panel will be an important issue for those skilled in the art.
Disclosure of Invention
The invention provides an electronic paper display and a driving method thereof, which can effectively reduce the time for processing a touch track with a prediction error and improve the display quality of an electronic paper display panel.
According to an embodiment of the present invention, an electronic paper display includes an electronic paper display panel, a touch panel, and a processing circuit. The electronic paper display panel is used for displaying a display picture with a first color as a background. The touch panel and the electronic paper display panel are integrated and used for outputting a first touch coordinate of current touch. The processing circuit is coupled to the electronic paper display panel and the touch panel and is used for driving the electronic paper display panel to display a first touch track which has a second color and corresponds to a position between a first touch coordinate and a previous touch coordinate. The processing circuit further drives the electronic paper display panel to display a predicted track with a third color according to the first touch track and the previous touch track.
According to an embodiment of the present invention, a driving method of an electronic paper display includes: displaying a display picture with a background of a first color through an electronic paper display panel; outputting a first touch coordinate of current touch through a touch panel; driving the electronic paper display panel to display a first touch track which has a second color and corresponds to the first touch coordinate and the previous touch coordinate; and driving the electronic paper display panel to display a predicted track with a third color according to the first touch track and the previous touch track.
Based on the above, the electronic paper display and the driving method thereof according to the embodiments of the invention can predict the touch trajectory of the touch medium on the touch panel, and display the predicted touch trajectory on the electronic paper display panel in a manner of gray scale representation. Therefore, the predicted touch track displayed by the electronic paper display panel is not easy to be perceived by eyes of a user, and the watching quality of the user is improved. In addition, the time for processing the touch track with the wrong prediction can be effectively reduced.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a block diagram of an electronic paper display in accordance with one embodiment of the invention;
fig. 2 is a flowchart of a driving method of an electronic paper display according to an embodiment of the invention;
FIG. 3 is a diagram illustrating a touch display scenario of an electronic paper display panel displaying a predicted trajectory according to an embodiment of the invention;
FIG. 4 is a flow diagram illustrating operation of the processing circuit shown in FIG. 1 in accordance with one embodiment of the present invention;
FIG. 5 is a diagram illustrating a touch display scenario when a second touch trajectory is the same as a predicted trajectory according to an embodiment of the invention;
FIG. 6 is a diagram illustrating a touch display scenario when the second touch trajectory is different from the predicted trajectory according to an embodiment of the invention.
Detailed Description
In order that the present disclosure may be more readily understood, the following specific examples are given as illustrative of the invention which may be practiced in various ways. Further, wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Fig. 1 is a block diagram of an electronic paper display 100 according to an embodiment of the invention. Referring to fig. 1, an electronic paper display 100 includes a processing circuit 110, a touch panel 120, and an electronic paper display panel 130. In the embodiment, the touch panel 120 may be integrated with the electronic paper display panel 130, and the touch panel 120 may be overlapped below the electronic paper display panel 130, but the invention is not limited thereto.
The touch panel 120 may be, for example, an electromagnetic induction (EMR) or capacitive induction touch panel, but the invention is not limited thereto. The touch panel 120 can generate a touch result according to a touch behavior of a touch medium (e.g., a stylus or a finger), so as to perform a pointing operation on the processing circuit 110.
In the present embodiment, the electronic paper display panel 130 includes a plurality of pixels, and the pixels respectively correspond to a plurality of electrophoretic cells arranged in an array. These electrophoretic cells are, for example, Microcup structures (Microcup) and have electrophoretic particles of two colors (e.g., white electrophoretic particles and black electrophoretic particles, but the present invention is not limited thereto).
On the other hand, in the present embodiment, the processing circuit 110 is coupled between the touch panel 120 and the electronic paper display panel 130. The processing circuit 110 may generate a driving signal to the electronic paper display panel 130 according to the touch result to drive the plurality of electrophoretic particles in the electrophoretic cells. In the embodiment, the processing circuit 110 drives the electrophoretic particles to move in the electrophoretic cells by applying a voltage, so that each pixel of the e-paper display panel 130 can display black, white, gray scale or a specific color.
In detail, in the present embodiment, a single pixel of the e-paper display panel 130 may include an upper electrode layer, a plurality of electrophoretic cells, and a driving substrate. The electrophoretic cells may be arranged between the upper electrode layer and the drive substrate, and the display sides of the electrophoretic cells are close to the upper electrode layer. The upper electrode layer may be a transparent electrode layer, and the driving substrate may include a driving transistor, for example. And, the driving substrate may receive a driving signal provided by the processing circuit 110 through the driving transistor to drive the white electrophoretic particles and the black electrophoretic particles to move in the electrophoretic cells.
For example, in the present embodiment, the white electrophoretic particles may be negatively charged, and the black electrophoretic particles may be positively charged. When the driving substrate applies a negative voltage according to the driving signal, the negatively charged white electrophoretic particles move toward the display side of the electrophoretic cell, so that the electronic paper display panel 130 can display a white display image according to the moving direction of the electrophoretic particles. In contrast, when the driving substrate applies a high positive voltage according to the driving signal, the positively charged black electrophoretic particles move toward the display side of the electrophoretic cell, so that the e-paper display panel 130 can display a black display image according to the moving direction of the electrophoretic particles.
It should be noted that, in the embodiment, the processing circuit 110 can push the black electrophoretic particles and the white electrophoretic particles to specific equal positions in the electrophoretic cell by adjusting the voltage of the driving signal, so that the electronic paper display panel 130 displays a color with a gray scale value different from black or white.
Referring to fig. 1, fig. 2 and fig. 3 together, fig. 2 is a flowchart of a driving method of the electronic paper display 100 according to an embodiment of the present invention, and fig. 3 is a schematic diagram of a touch display scenario 300 of the electronic paper display panel 130 displaying a predicted trajectory LA according to an embodiment of the present invention.
In detail, in step S210, the electronic paper display 100 may display the display screen 131 with the background of the first color (for example, white) through the electronic paper display panel 130, but the invention is not limited thereto. In step S220, the electronic paper display 100 may output the first touch coordinate P2 of the current touch through the touch panel 120.
For example, in the present embodiment, the user can use the stylus pen 200 to write on the touch panel 120 (for example, a line segment shown in fig. 3, but the invention is not limited thereto), and at the first time point T1, the touch coordinate P0 is taken as the initial touch coordinate, and the first touch coordinate P2 is plotted along the touch tracks L1 and L2. At this time, the touch panel 120 can perform a touch pointing operation on the processing circuit 110 according to the touch result at the first time point T1.
Next, in step S230, the processing circuit 110 may drive the electronic paper display panel 130 to display a first touch track having a second color (e.g., black) and corresponding to the first touch coordinate P2 and the previous touch coordinate.
Further, after the stylus pen 200 traces the touch coordinates P0 along the touch tracks L1 and L2 to the first touch coordinate P2, the processing circuit 110 may generate a driving signal with a positive voltage to the e-paper display panel 130 according to the touch result, so as to move the positively charged black electrophoretic particles toward the display side of the electrophoretic cells. In this case, the processing circuit 110 may display the first touch trajectory L2 corresponding to the position between the first touch coordinate P2 and the previous touch coordinate P1 and the previous touch trajectory L1 corresponding to the position between the touch coordinate P0 and the previous touch coordinate P1 in the display screen 131 of the electronic paper display panel 130 in the second color (e.g., black).
Next, in step S240, the processing circuit 110 may drive the electronic paper display panel 130 to display the predicted trajectory LA having the third color (e.g., gray scale) according to the first touch trajectory L2 and the previous touch trajectory L1.
For example, under some design requirements (in some embodiments), at a second time point T2 after the first time point T1 (i.e., after the touch panel 120 outputs the first touch coordinate P2 of the current touch), the processing circuit 110 may predict the touch coordinate of the next touch output by the touch panel 120 (i.e., the predicted touch coordinate PA) according to the first touch trajectory L2 and the previous touch trajectory L1 and predict the touch trajectory between the first touch coordinate P2 of the current touch and the touch coordinate of the next touch (i.e., the predicted trajectory LA) through an algorithm.
Meanwhile, after the predicted trajectory LA is predicted, the processing circuit 110 may generate a driving signal to the electronic paper display panel 130 according to the predicted result, so as to respectively push the black electrophoretic particles and the white electrophoretic particles to specific equal positions in the electrophoretic cells. In this case, the processing circuit 110 may display the predicted trajectory LA in a third color (e.g., gray scale) on the display screen 131 of the e-paper display panel 130.
In other design requirements (in other embodiments), at the second time point T2, the processing circuit 110 may also predict the touch coordinates of the next touch output by the touch panel 120 (i.e., the predicted touch coordinates PA) according to the first touch trajectory L2 and predict the touch trajectory between the first touch coordinates P2 of the current touch and the touch coordinates of the next touch (i.e., the predicted trajectory LA) through the algorithm. Moreover, the processing circuit 110 may also display the predicted trajectory LA in a third color (e.g., gray scale) on the display screen 131 of the electronic paper display panel 130.
In other words, in the touch display scenario 300 shown in fig. 3, the processing circuit 110 may predict, through the algorithm, the touch coordinate(s) (i.e., the predicted touch coordinate PA) of the next touch output by the touch panel 120 and the touch track (i.e., the predicted track LA) between the first touch coordinate P2 of the current touch and the touch coordinate(s) (i.e., the touch coordinates P0-P2) of the next touch according to one or more touch tracks (e.g., the touch tracks L1, L2) and/or two or more touch coordinates (e.g., the touch coordinates P0-P2) before the first touch coordinate P2 of the current touch.
It should be noted that the algorithm of the present embodiment may be, for example, a Kalman Filter (Kalman Filter) or an extrapolation method, but the present invention is not limited thereto. In addition, in the embodiment, the gray scale of the third color may be between the first color and the second color. The first color is, for example, white, the second color is, for example, black, and the third color is, for example, gray, but the invention is not limited thereto.
As can be understood from the above description of the touch display scenario 300 shown in fig. 3, the electronic paper display 100 of the present embodiment can calculate the predicted touch coordinate PA and the predicted touch trajectory LA through the processing circuit 110, and display the predicted touch trajectory LA on the electronic paper display panel 130 in a manner of representing a third color (e.g., a gray scale). Therefore, compared to the prior art in which the predicted touch trajectory is displayed on the display panel in a black representation manner, the predicted touch trajectory LA displayed on the electronic paper display panel 130 of the embodiment is less likely to be perceived by the eyes of the user, thereby improving the viewing quality of the user.
For operation details of determining whether the predicted trajectory LA predicted by the processing circuit 110 is the same as the touch trajectory (i.e., the second touch trajectory L3) between the touch coordinates of the actual touch 200 depicted from the first touch coordinate P2 to the touch coordinate of the next touch (i.e., the second touch coordinate P3), please refer to fig. 1, fig. 4, fig. 5, and fig. 6. FIG. 4 is a flowchart illustrating an operation of the processing circuit 110 shown in FIG. 1 according to an embodiment of the invention, FIG. 5 is a diagram illustrating a touch display scenario 500 when the second touch trajectory L3 is the same as the predicted trajectory LA according to an embodiment of the invention, and FIG. 6 is a diagram illustrating a touch display scenario 600 when the second touch trajectory L3 is different from the predicted trajectory LA according to an embodiment of the invention.
In this embodiment, after the electronic paper display 100 performs the operation of step S240 shown in fig. 2, the electronic paper display may continue to perform the operation of step S410 shown in fig. 4. Referring to fig. 1, fig. 4 and fig. 5, in step S410, the electronic paper display 100 may output a second touch coordinate P3 of a next touch through the touch panel 120.
Specifically, after the processing circuit 110 displays the predicted trajectory LA in the third color (e.g., gray scale) on the e-paper display panel 130 at the second time point T2, the stylus pen 200 may draw from the first touch coordinate P2 to the second touch coordinate P3 along the second touch trajectory L3 at a third time point after the second time point T2. At this time, the touch panel 120 can perform a touch pointing operation on the processing circuit 110 according to the touch result at the third time point T3. The second touch trajectory L3 of the present embodiment can be represented as a touch trajectory actually drawn by the next touch of the stylus 200.
In step S420, the processing circuit 110 may determine whether the second touch trajectory L3 between the first touch coordinate P2 and the second touch coordinate P3 is the same as the predicted trajectory LA. For example, the processing circuit 110 may determine whether the second touch trajectory L3 actually drawn by the stylus pen 200 at the third time point T3 and the predicted trajectory LA calculated by the processing circuit 110 at the second time point T2 have an overlapping portion.
When the processing circuit 110 determines that the second touch trajectory L3 is the same as the predicted trajectory LA (i.e., the second touch trajectory L3 and the predicted trajectory LA have an overlapping portion), the processing circuit 110 continues to perform the operation of step S430. In contrast, when the processing circuit 110 determines that the second touch trajectory L3 and the predicted trajectory LA are different trajectories (i.e., the second touch trajectory L3 and the predicted trajectory LA do not have an overlapping portion), the processing circuit 110 continues to perform the operations of step S440 and step S450.
Referring to fig. 1, fig. 4 and fig. 5, in step S430, the processing circuit 110 may drive the electronic paper display panel 130 to convert the predicted trajectory LA displayed by the electronic paper display panel 130 into a second color (e.g., black).
In detail, in the touch display scenario 500, when the processing circuit 110 determines that the second touch trajectory L3 and the predicted trajectory LA have an overlapped portion, the processing circuit 110 may generate a driving signal with a positive voltage to the electronic paper display panel 130 according to the determination result, so that the black electrophoretic particles in the pixels corresponding to the portion of the predicted trajectory LA overlapped with the second touch trajectory L3 move from the original specific equal position toward the display side of the electrophoretic cell.
Thus, the processing circuit 110 can convert the portion of the predicted trajectory LA, which is displayed on the electronic paper display panel 130 and overlaps the second touch trajectory L3, from the third color (e.g., gray scale) to the second color (e.g., black) and display the converted portion on the display screen 131.
Referring to fig. 1, fig. 4 and fig. 6, in step S440, the processing circuit 110 may drive the electronic paper display panel 130 to convert the predicted trajectory LA displayed by the electronic paper display panel 130 into a first color (e.g., white).
In detail, in the touch display scenario 600, when the processing circuit 110 determines that the second touch trajectory L3 and the predicted trajectory LA do not have the overlapped portion, the processing circuit 110 may generate a driving signal with a negative voltage to the electronic paper display panel 130 according to the determination result, so that the white electrophoretic particles in the pixels corresponding to the portion of the predicted trajectory LA that is not overlapped with the second touch trajectory L3 move from the original specific equal position toward the display side of the electrophoretic cell.
Thus, the processing circuit 110 can convert the portion of the predicted trajectory LA, which is not overlapped with the second touch trajectory L3 and is displayed on the electronic paper display panel 130, from the third color (e.g., gray scale) to the first color (e.g., white) and display the converted portion on the display screen 131.
Next, in step S450 after step S440, the processing circuit 110 may further drive the electronic paper display panel 130 to display a second touch trajectory L3 having a second color (e.g., black).
Specifically, in the case that the processing circuit 110 does not predict the actual touch trajectory (i.e., the second touch trajectory L3) between the first touch coordinate P2 and the second touch coordinate P3 of the stylus 200, the processing circuit 110 may generate a driving signal with a positive voltage to the electronic paper display panel 130 according to the determination result, so that the black electrophoretic particles in the pixels corresponding to the portion of the second touch trajectory L3 that is not overlapped with the predicted trajectory LA move toward the display side of the electrophoretic cell.
Thus, the processing circuit 110 can convert the portion of the second touch trajectory L3 that is not overlapped with the predicted trajectory LA and is displayed on the electronic paper display panel 130 from the first color (e.g., white) to the second color (e.g., black) and display the converted portion on the display screen 131.
As can be understood from the above description of the touch display scenario 600 in fig. 6, since the predicted touch trajectory LA of the present embodiment is displayed on the electronic paper display panel 130 in the manner of a third color (e.g., a gray scale) at the second time point T2, and the white electrophoretic particles in the pixel corresponding to the predicted touch trajectory LA are pushed to a specific equal position in the electrophoretic cell in advance. Therefore, when it is determined that the second touch trajectory L3 and the predicted trajectory LA do not have an overlapped portion, the processing circuit 110 only needs to move the white electrophoretic particles in the corresponding pixel from the original specific equal position toward the display side of the electrophoretic cell at the third time point T3, so that the portion of the predicted trajectory LA that is not overlapped with the second touch trajectory L3 can be converted from the third color (e.g., gray scale) to the first color (e.g., white) to be displayed on the e-paper display panel 130.
Thus, compared to the prior art that needs to convert the part of the predicted track that is not overlapped with the actual touch track from the original black to the white to move the white electrophoretic particles from the driving substrate to the display side of the electrophoretic cell, the processing circuit 110 of the embodiment can more effectively reduce the time for processing the touch track with the wrong prediction, and can more quickly convert the predicted track LA displayed on the electronic paper display panel 130 into the first color (e.g., white).
In summary, the electronic paper display and the driving method thereof according to the embodiments of the invention can predict the touch trajectory of the touch medium on the touch panel, and display the predicted touch trajectory on the electronic paper display panel in a manner of gray scale representation. Therefore, the predicted touch track displayed by the electronic paper display panel is not easy to be perceived by eyes of a user, and the watching quality of the user is improved. In addition, the time for processing the touch track with the wrong prediction can be effectively reduced.

Claims (10)

1. An electronic paper display, comprising:
the electronic paper display panel is used for displaying a display picture with a first color as a background;
the touch panel is integrated with the electronic paper display panel and used for outputting a first touch coordinate of current touch; and
a processing circuit coupled to the electronic paper display panel and the touch panel and configured to drive the electronic paper display panel to display a first touch trajectory having a second color and corresponding to a position between the first touch coordinate and a previous touch coordinate,
the processing circuit further drives the electronic paper display panel to display a predicted track with a third color according to the first touch track and a previous touch track.
2. The electronic paper display of claim 1, wherein the touch panel outputs a second touch coordinate of a next touch, and when the processing circuit determines that a second touch trajectory between the first touch coordinate and the second touch coordinate is the same as the predicted trajectory, the processing circuit drives the electronic paper display panel to convert the predicted trajectory displayed by the electronic paper display panel into the second color.
3. The electronic paper display of claim 2, wherein when the processing circuit determines that the second touch trajectory is different from the predicted trajectory, the processing circuit drives the electronic paper display panel to convert the predicted trajectory displayed by the electronic paper display panel into the first color.
4. The electronic paper display of claim 3, wherein when the processing circuit determines that the second touch trajectory is different from the predicted trajectory, the processing circuit further drives the electronic paper display panel to display the second touch trajectory having the second color.
5. The electronic paper display of claim 1, wherein the gray scale of the third color is between the first color and the second color.
6. A driving method of an electronic paper display, comprising:
displaying a display picture with a background of a first color through an electronic paper display panel;
outputting a first touch coordinate of current touch through a touch panel;
driving the electronic paper display panel to display a first touch track which has a second color and corresponds to the position between the first touch coordinate and a previous touch coordinate; and
and driving the electronic paper display panel to display a predicted track with a third color according to the first touch track and a previous touch track.
7. The driving method according to claim 6, further comprising:
outputting a second touch coordinate of the next touch through the touch panel;
judging whether a second touch track between the first touch coordinate and the second touch coordinate is the same as the predicted track or not; and
when the second touch track is the same as the predicted track, driving the electronic paper display panel to convert the predicted track displayed by the electronic paper display panel into the second color.
8. The driving method according to claim 7, further comprising:
when the second touch track is different from the predicted track, driving the electronic paper display panel to convert the predicted track displayed by the electronic paper display panel into the first color.
9. The driving method according to claim 8, further comprising:
when the second touch track is different from the predicted track, the electronic paper display panel is also driven to display the second touch track with the second color.
10. The driving method according to claim 6, wherein the gray scale of the third color is between the first color and the second color.
CN202010290875.5A 2020-04-14 2020-04-14 Electronic paper display and driving method thereof Active CN113534989B (en)

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