CN115116399A

CN115116399A - Electronic paper display device and operation method thereof

Info

Publication number: CN115116399A
Application number: CN202110286459.2A
Authority: CN
Inventors: 程孝龙; 刘书呈; 田沛霖; 褚承鑫; 洪集茂
Original assignee: E Ink Holdings Inc
Current assignee: E Ink Holdings Inc
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2022-09-27

Abstract

The invention provides an electronic paper display device and an operation method thereof. The electronic paper display device comprises an electronic paper display panel and a time sequence controller. The time schedule controller comprises a first image buffer memory, a second image buffer memory and an updating buffer memory, and receives touch track data. The first image buffer memory and the second image buffer memory are in a reciprocating exchange buffer memory structure and receive the video streaming in a staggered time sequence. When the first image buffer memory receives the video streaming to update the current display image data to the update buffer memory, the second image buffer memory receives the touch track data and synchronously updates the current display image data stored in the update buffer memory. The time schedule controller drives the electronic paper display panel according to the current display picture data. The electronic paper display device and the operation method thereof can provide a handwriting function with good user experience.

Description

Electronic paper display device and operation method thereof

Technical Field

The present disclosure relates to display devices, and particularly to an electronic paper display device and an operating method thereof.

Background

For a conventional electronic paper display device with a touch handwriting function, when a user performs touch handwriting on an electronic paper display panel integrated with a touch panel, the conventional electronic paper display device first provides touch trajectory data obtained by the touch handwriting to a main control device to perform a trajectory drawing operation on display screen data, and then transmits the display screen data on which a corresponding touch trajectory pattern is drawn back to a timing controller to drive the electronic paper display panel. In contrast, the master device may spend a lot of image processing time and computational resources to trace the frames in the video stream. Since the driving waveform of the electrophoretic cell of the electronic paper display panel needs a period of driving, the electronic paper display panel cannot respond to the touch or handwriting function of the electronic paper display device in time to provide a normal corresponding display effect. In view of this, several embodiments of solutions will be presented below.

Disclosure of Invention

The invention provides an electronic paper display device and an operation method thereof, which can provide a handwriting function with good user experience.

According to an embodiment of the present invention, the electronic paper display device of the present invention includes an electronic paper display panel and a timing controller. The time schedule controller is coupled with the electronic paper display panel. The timing controller includes a first image buffer memory, a second image buffer memory and an update buffer memory, and is used for receiving touch track data. The first image buffer memory and the second image buffer memory are a ping-pong buffer memory architecture and are used for receiving video streams in an interlaced sequence. When the first image buffer memory receives the video streaming to update the current display frame data to the update buffer memory, the second image buffer memory receives the touch track data and synchronously updates the current display frame data stored in the update buffer memory. The time sequence controller drives the electronic paper display panel according to the current display picture data.

According to an embodiment of the present invention, the operation method of the present invention is suitable for an electronic paper display device. The electronic paper display device comprises an electronic paper display panel and a time schedule controller. The time schedule controller comprises a first image buffer memory, a second image buffer memory and an updating buffer memory. The operating method comprises the following steps: receiving a video stream through a first image buffer memory and a second image buffer memory in a staggered time sequence, wherein the first image buffer memory and the second image buffer memory are in a reciprocating exchange buffer memory architecture; when the video streaming is received through the first image buffer memory to update the current display picture data into the update buffer memory, the touch track data is received through the second image buffer memory, and the current display picture data stored in the update buffer memory is synchronously updated; and driving the electronic paper display panel through the time sequence controller according to the current display picture data.

Based on the above, the electronic paper display device and the operation method thereof of the present invention can rapidly and synchronously update the background image and the touch track (handwriting track) through the timing controller.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a block diagram of an electronic paper display device according to an embodiment of the present invention;

FIG. 2 is a flow chart of a method of operation of an embodiment of the present invention;

FIGS. 3A-3D are schematic diagrams illustrating a plurality of image data writing scenarios according to an embodiment of the invention;

fig. 4A to 4D are schematic diagrams of a plurality of image data writing scenarios according to another embodiment of the present invention.

Description of the reference numerals

100, electronic paper display device;

110 is a time schedule controller;

111. 112, an image buffer memory;

113, updating the buffer memory;

114, a self-drawing module;

120, an electronic paper display panel;

121: a touch panel;

200, a main control end device;

S210-S250, step (II);

311. 311 ', 411' a first frame;

312. 312 ', 412' a second frame;

313. 413: third frame;

314. 414 fourth frame;

321. 322, 323, 324, 421, 422, 423, 424, update frame.

Detailed Description

Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. 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 device according to an embodiment of the invention. Referring to fig. 1, the electronic paper display device 100 includes a timing controller 110 and an electronic paper display panel 120. A Timing Controller (TCON) 110 is coupled to the electronic paper display panel 120. The timing controller 110 includes image buffer memories (image buffer memories) 111 and 112, an update buffer memory (update buffer memory)113, and a self-drawing module 114. The e-paper display panel 120 includes a pixel array composed of a plurality of electrophoretic cells arranged in an array, and is integrated with a touch panel 121 to provide a touch display function. In the present embodiment, the timing controller 110 outputs a plurality of driving signals respectively corresponding to the plurality of electrophoretic cells according to the display frame data stored in the update buffer 113, wherein the driving signals respectively have driving waveforms. The timing controller 110 may further include a driving circuit (not shown) disposed between the timing controller 110 and the electronic paper display panel 120.

In this embodiment, the timing controller 110 can be further coupled to an external master device 200, and the master device 200 can provide a Video stream (Video stream) to the timing controller 110. In the embodiment, the

image buffers

111 and 112 are ping-pong buffers (or double-buffer) structures, but the invention is not limited to the ping-pong buffers, and actually, two or more buffer structures may be used, and the embodiment is described in the simplest state. The

video buffers

111, 112 may be used to receive the video stream provided by the master device 200 in a staggered timing manner. In the present embodiment, the timing controller 110 can also receive touch trajectory data provided by the touch panel 121 through the drawing module 114. Here, the touch trajectory data may refer to, for example, a user performing a touch handwriting function (e.g., the user touches with a finger or touches with a stylus) on the electronic paper display panel 120 (the touch panel 121) so that the touch panel 121 returns corresponding touch trajectory data. The touch trajectory data may include a plurality of touch coordinate data corresponding to a continuous time sequence.

In this embodiment, the timing controller 110 may further include other related driving circuits and memory units to implement the related operations according to the embodiments of the present invention. The self-drawing module 114 may be, for example, a software program stored in a storage unit of the timing controller 110, and the driving circuit of the timing controller 110 may write the touch trajectory data into the display image data temporarily stored in the

image buffer memories

111 and 112 by executing the self-drawing module 114, so that the display image data temporarily stored in the

image buffer memories

111 and 112 has a corresponding touch trajectory. That is, the timing controller 110 of the embodiment can transmit back the corresponding touch trace data according to the touch panel 121 to drive the electronic paper display panel 120 and display the corresponding touch trace, without providing the display data corresponding to the touch portion through the main control device 200. From another perspective, the timing controller 110 of the present embodiment may have a function of automatically updating the display frame (i.e., updating the touch track or the handwriting track). The timing controller 110 can generate a new function of displaying the image (i.e., add the touch trajectory data or the handwriting trajectory data to the image data provided by the host device 200).

In addition, the electronic paper display device 100 and the host device 200 may be integrated in a terminal device, and the host device 200 of the embodiment may be, for example, a Central Processing Unit (CPU) or other Processing chip of the terminal device, and is used for providing a video stream to the timing controller 110. In addition, in other embodiments of the present invention, the host device 200 may further include a handwriting function module for receiving the touch trajectory data provided by the drawing module 114 to update the display frame data in the video stream, so that the display frame data in the video stream continuously provided by the host device 200 further includes trajectory pattern data corresponding to the touch trajectory data.

FIG. 2 is a flow chart of a method of operation of an embodiment of the present invention. Referring to fig. 1 and 2, in an initial operation of the electronic paper display device 100 of fig. 1, the update buffer 113 and the self-drawing module 114 are not activated while the electronic paper display device 100 receives a first image of the video stream from the host device 200 from a first image buffer (e.g., the image buffer 111 of fig. 1). After the first image is received, the electronic paper display device 100 starts to update the buffer memory 113 and the self-drawing module 114. The update buffer memory 113 reads the first image stored in the first image buffer memory to drive the electronic paper display panel 120, and the first image may be provided to the self-drawing module 114 for use. During the period that the electronic paper display device 100 receives the second image of the video stream provided by the host device 200 from the second image buffer memory (e.g., the image buffer memory 112 in fig. 1), the buffer memory 113 is updated and the self-drawing module 114 continues to read or use the first image buffer memory. When the second image is received, the update buffer 113 switches to read the second image stored in the second image buffer, and the second image is available to the self-drawing module 114. The update buffer 113 and the drawing module 114 use the second image as background display data, and the update buffer 113 can compare the first image with the second image to update the current display data to drive the electronic paper display panel 120. Then, the operation flow of each sheet after the electronic paper display device 100 receives the third image can be as the following steps S210 to S250.

In step S210, the electronic paper display device 100 may receive the video stream provided by the host device 200 through the

image buffer memories

111 and 112 in a staggered time sequence. At a time point, in step S220, when the first image buffer memory (e.g., the image buffer memory 111 of fig. 1) receives the video stream to update the current display screen data into the update buffer memory 113, the electronic paper display apparatus 100 may receive the touch trajectory data through the second image buffer memory (e.g., the image buffer memory 112 of fig. 1) and synchronously update the current display screen data stored in the update buffer memory 113. In step S230, the electronic paper display device 100 may drive the electronic paper display panel 120 through the timing controller 110 according to the current display frame data.

In the present embodiment, the first image buffer memory (e.g., the image buffer memory 111 of fig. 1) may receive the video stream to temporarily store the current background display data. Also, the update buffer 113 may update the background portion of the current display frame data according to the current background display data. It is noted that, in some embodiments of the present invention, the timing controller 110 may update only the portion of the frame where the difference exists, compared to the difference between the current background display data and the current display frame data.

In the present embodiment, the second image buffer memory (e.g., the image buffer memory 112 of fig. 1) may continuously receive the touch coordinate data of the touch trajectory data in time sequence, so as to update the previous background display data according to the touch coordinate data. For this reason, the update rate (or sensing frequency) of the touch frame (touch frame) of the touch panel 121 may be higher than the update rate (or frame frequency) of the video stream provided by the master device 200. Moreover, the update buffer 113 may update the touch trajectory in the current display frame data according to the updated previous background display data.

In some embodiments of the present invention, after the second image buffer memory (e.g., the image buffer memory 112 of fig. 1) provides the updated previous background display data to the update buffer memory 113 to update the touch trajectory in the current display frame data, the timing controller 110 may output a plurality of corresponding driving waveforms (waveforms) according to the touch trajectory in the current display frame data, and drive a plurality of corresponding pixels (i.e., a plurality of corresponding electrophoretic cells) in the electronic paper display panel 120. However, since the driving of the electrophoretic cell requires a driving period, which is longer than a frame period of the video stream, the timing controller 110 may determine to output a plurality of driving waveforms to drive at least a portion of pixels of the electronic paper display panel 120 according to a difference between the current display frame data and the display frame of the electronic paper display panel 120, and before the driving of the driving waveforms is finished, the timing controller 110 does not update a portion of the current display frame data stored in the update buffer 113 corresponding to the at least a portion of pixels.

At the next time point, in step S240, when the second image buffer memory (e.g., the image buffer memory 112 of fig. 1) is swapped to receive the video stream to update the next display frame data to the update buffer memory 113, the electronic paper display device 100 may receive the next touch trajectory data through the first image buffer memory (e.g., the image buffer memory 111 of fig. 1) and synchronously update the next display frame data stored in the update buffer memory 113. In step S250, the electronic paper display device 100 drives the electronic paper display panel 120 through the timing controller 110 according to the next display frame data.

In this embodiment, steps S220 to S250 may be executed in a loop, and so on, in the future, the display screen data is updated. Therefore, the operation method and the electronic paper display device 100 of the embodiment utilize the timing controller 110 to perform the function of automatically updating the display screen of the touch track or the handwriting track.

Fig. 3A to 3D are schematic diagrams of a plurality of image data writing scenarios according to an embodiment of the invention. Referring to fig. 1 and fig. 3A to 3D, an exemplary implementation of the handwriting function module (handwriting function software) not executed by the host device 200 is as follows. Referring to fig. 3A, at a first time point (e.g., time t0), the image buffer 111 receives and temporarily stores a first frame 311 of the video stream provided by the host device 200, wherein the first frame 311 may be regarded as a background frame. The image buffer memory 112 does not receive the touch trajectory data. The image buffer 111 may update the first frame 311 into the update buffer 113, so that the timing controller 110 drives the e-paper display panel 120 according to the frame 321 stored in the update buffer 113.

Then, referring to fig. 3B, at a second time point (e.g., time t1), the image buffer memory 112 may exchange to receive and temporarily store a second frame 312 of the video stream provided by the master device 200, wherein the second frame 312 may be regarded as a background frame. The first frame 311 and the second frame 312 may be the same blank frame, the same content frame, or different frames. The image buffer 111 receives the first touch trajectory data TD1 provided from the drawing module 114 and updates the first touch trajectory data TD1 into the first frame 311' temporarily stored at present. As shown in fig. 3B, the first frame 311' may include a touch trajectory corresponding to the first touch trajectory data TD 1. In FIG. 3B, the update buffer 113 updates the background portion of the frame 322 (i.e. updates the background portion of the current frame data) according to the second frame 312. In fig. 3B, the update buffer 113 updates the touch track portion in the frame 322 (i.e. updates the touch track portion in the display frame data) according to the updated first frame 311'. The timing controller 110 drives the e-paper display panel 120 according to the frames 322 stored in the update buffer 113.

Then, referring to fig. 3C, at a third time point (e.g., time t2), the image buffer memory 111 receives and temporarily stores a third frame 313 of the video stream provided by the host device 200, wherein the third frame 313 may be regarded as a background frame. The second frame 312 and the third frame 313 may be the same blank frame, the same content frame, or different frames. The image buffer memory 112 receives the second touch trajectory data TD2 provided from the drawing module 114, and updates the second touch trajectory data TD2 to the second frame 312' temporarily stored at present. As shown in fig. 3C, the second frame 312' may include a touch trajectory corresponding to the second touch trajectory data TD 2. In FIG. 3C, the update buffer 113 updates the background portion of the frame 323 (i.e., updates the background portion of the current frame data) according to the third frame 313. In fig. 3C, the update buffer 113 updates the touch trajectory part in the frame 323 (i.e. updates the touch trajectory part in the display frame data) according to the updated second frame 312'. The timing controller 110 drives the e-paper display panel 120 according to the frame 323 stored in the update buffer 113. It should be noted that, since the plurality of driving waveforms provided by the timing controller 110 corresponding to the touch trajectory portion in the frame 322 at the previous time point t2 are not driven, the timing controller 110 does not update the portion of the frame 323 corresponding to the touch trajectory portion in the frame 322 stored in the update buffer 113. Thus, the frame 323 still has the touch trajectory portion in the frame 322.

Then, referring to fig. 3D, at a fourth time point (e.g., time t3), the graphics buffer memory 112 receives and temporarily stores a fourth frame 314 of the video stream provided by the host device 200, wherein the fourth frame 314 may be regarded as a background frame. The third frame 313 and the fourth frame 314 may be the same blank frame, the same content frame, or different frames. The image buffer memory 111 may exchange but not receive touch trajectory data. As shown in fig. 3D, the third frame 313 is not updated. In FIG. 3D, the update buffer 113 updates the background portion of the frame 324 (i.e., updates the background portion of the current frame data) according to the fourth frame 314. In fig. 3D, the update buffer 113 updates the frame 324 according to the updated third frame 313, so that the touch trajectory is not present in the display frame data. The timing controller 110 drives the e-paper display panel 120 according to the frame 324 stored in the update buffer 113. It should be noted that, since the timing controller 110 has not yet driven the plurality of driving waveforms provided by the touch trajectory in the frame 323 corresponding to the previous time point t3, the timing controller 110 does not update the portion of the frame 324 stored in the update buffer 113 corresponding to the touch trajectory in the frame 323. Thus, the frame 324 still remains the portion of the touch trajectory in the frame 323. However, the portion of the frame 324 corresponding to the touch trajectory in the frame 322 is cleared (because of the updated result according to the third frame 313). Therefore, in the exemplary embodiments of fig. 3A to 3D, the electronic paper display panel 120 may display the touch track or the handwriting track inputted by the user, and the touch track or the handwriting track inputted by the user will disappear dynamically according to the time sequence.

Fig. 4A to 4D are schematic diagrams of a plurality of image data writing scenarios according to another embodiment of the present invention. Referring to fig. 1 and fig. 4A to 4D, an exemplary implementation of the host device 200 executing the handwriting function module (handwriting function software) is as follows. Referring to fig. 4A, at a first time point (e.g., time t 0'), the video buffer 111 receives and temporarily stores a first frame 411 of the video stream provided by the host device 200, wherein the first frame 411 may be regarded as a background frame. The image buffer memory 112 does not receive the touch trajectory data. The image buffer memory 111 may update the first frame 411 to the update buffer memory 113, so that the timing controller 110 drives the e-paper display panel 120 according to the frame 421 stored in the update buffer memory 113.

Then, referring to fig. 4B, at a second time point (e.g., time t 1'), the graphics buffer 112 receives and temporarily stores a second frame 412 of the video stream provided by the host device 200, wherein the second frame 412 may be regarded as a background frame. The first frame 411 and the second frame 412 may be the same blank frame, the same content frame or different frames. The image buffer 111 receives the first touch trajectory data TD1 provided from the drawing module 114 and updates the first touch trajectory data TD1 into the first frame 411' temporarily stored at present. As shown in fig. 4B, the first frame 411' may include a touch trajectory corresponding to the first touch trajectory data TD 1. In FIG. 4B, the update buffer 113 updates the background portion of the frame 422 according to the second frame 412 (i.e. updates the background portion of the current frame data). In fig. 4B, the update buffer 113 updates the touch trajectory part in the frame 422 (i.e. updates the touch trajectory part in the display frame data) according to the updated first frame 411'. The timing controller 110 drives the electronic paper display panel 120 according to the frame 422 stored in the update buffer 113. It should be noted that the handwriting function module executed by the host device 200 may also receive the first touch trajectory data TD1 provided by the self-drawing module 114, and update the display screen data in the video stream according to the first touch trajectory data TD1, so that the display screen data includes the touch trajectory data.

Next, referring to fig. 4C, at a third time point (e.g., time t 2'), the image buffer memory 111 receives and temporarily stores a third frame 413 of the video stream provided by the host device 200, wherein the third frame 413 may be regarded as a background frame. It is noted that, unlike the embodiment of fig. 3C, the frame content of the third frame 413 of the present embodiment includes a touch trajectory pattern corresponding to the first touch trajectory data TD 1. The second frame 412 and the third frame 413 may be the same blank frame, the same content frame, or different frames. The image buffer memory 112 receives the second touch trajectory data TD2 provided from the drawing module 114, and updates the second touch trajectory data TD2 to the second frame 412' temporarily stored at present. As shown in fig. 4C, the second frame 412' may include a touch trajectory corresponding to the second touch trajectory data TD 2. In fig. 4C, the update buffer 113 updates the background portion of the frame 423 (i.e., updates the background portion of the current frame data) according to the third frame 413. In fig. 4C, the buffer memory 113 is updated to update the touch trajectory part in the frame 423 (i.e. to update the touch trajectory part in the display frame data) according to the updated second frame 412'. The timing controller 110 drives the e-paper display panel 120 according to the frame 423 stored in the update buffer 113. It should be noted that, since the timing controller 110 provides the plurality of driving waveforms that have not been driven to the end in the portion of the touch trajectory in the frame 422 corresponding to the previous time point t2, the timing controller 110 does not update the portion of the touch trajectory in the frame 422 corresponding to the portion of the touch trajectory in the frame 423 stored in the update buffer memory 113. Thus, frame 423 still leaves the portion of the touch trajectory in frame 422. Moreover, the touch track pattern in the third frame 413 overlaps with a portion of the touch track in the corresponding frame 422 in the frame 423. It should be noted that the handwriting function module executed by the host device 200 may also receive the second touch trajectory data TD2 provided by the self-drawing module 114, and update the display screen data in the video stream according to the second touch trajectory data TD2, so that the display screen data includes the touch trajectory data.

Then, referring to fig. 4D, at a fourth time point (e.g., time t 3'), the graphics buffer memory 112 receives and temporarily stores a fourth frame 414 of the video stream provided by the master device 200, wherein the fourth frame 414 may be regarded as a background frame. It should be noted that, unlike the embodiment of fig. 3C, the frame content of the fourth frame 414 of the present embodiment includes touch track patterns corresponding to the first touch track data TD1 and the second touch track data TD 2. The third frame 413 and the fourth frame 414 may be the same blank frame, the same content frame, or different frames. The image buffer memory 111 may exchange but not receive touch trajectory data. As shown in fig. 4D, the third frame 413 is not updated. In FIG. 4D, the update buffer 113 updates the background portion of the frame 424 (i.e., updates the background portion of the current frame data) according to the fourth frame 414. In fig. 4D, the update buffer 113 updates the frame 424 according to the updated third frame 413, so that the touch trace pattern corresponding to the first touch trace data TD1 is reserved in the display frame data. However, unlike the embodiment of fig. 3D, due to the frame content of the fourth frame 414, a touch track pattern corresponding to the first touch track data TD1 and the second touch track data TD2 is included. The frame content of the fourth frame 414 covers the third frame 413, so the frame 424 may have the same frame content as the fourth frame 414. The timing controller 110 drives the electronic paper display panel 120 according to the frame 424 stored in the update buffer memory 113. Therefore, in the exemplary embodiment of fig. 4A to 4D, the electronic paper display panel 120 may display the touch track or the handwriting track input by the user, and the touch track or the handwriting track input by the user is continuously displayed on the display screen of the electronic paper display panel 120.

In summary, the electronic paper display device and the operating method thereof of the present invention can utilize the reciprocal swap buffer memory architecture in the timing controller to achieve the function of synchronously updating the background image and the touch trace (handwriting trace). The electronic paper display device and the operation method thereof can judge each pixel (namely each electrophoresis unit) of the electronic paper display panel so as to judge whether the driving waveform in the driving process is finished or not to determine whether to update the current display picture data in the buffer memory or not. Therefore, the electronic paper display device and the operation method thereof can provide a good display effect in response to the touch or handwriting function of the electronic paper display device.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An electronic paper display device, comprising:

an electronic paper display panel; and

a timing controller coupled to the electronic paper display panel, wherein the timing controller includes a first image buffer memory, a second image buffer memory, and an update buffer memory, and is configured to receive touch trajectory data,

wherein the first and second image buffers are ping-pong buffer architectures and configured to receive video streams in an interleaved manner,

wherein when the first image buffer memory receives the video stream to update the current display screen data into the update buffer memory, the second image buffer memory receives the touch trajectory data and synchronously updates the current display screen data stored in the update buffer memory,

the time sequence controller drives the electronic paper display panel according to the current display picture data.

2. The electronic paper display device of claim 1, wherein the first image buffer memory receives the video stream to temporarily store current background display data, and the update buffer memory updates a background portion of the current display frame data according to the current background display data.

3. The electronic paper display device according to claim 2, wherein the second image buffer memory receives a plurality of touch coordinate data of the touch trajectory data in a continuous time sequence to update previous background display data according to the plurality of touch coordinate data, and the update buffer memory updates the touch trajectory part in the current display screen data according to the updated previous background display data.

4. The device of claim 1, wherein the timing controller determines to output a plurality of driving waveforms to drive at least a portion of the pixels of the e-paper display panel according to a difference between the current display frame data and the display frame of the e-paper display panel, and the timing controller does not update a portion of the current display frame data stored in the update buffer corresponding to the at least a portion of the pixels before the driving of the plurality of driving waveforms is finished.

5. The electronic paper display device of claim 1, wherein the timing controller returns the touch trajectory data to a handwriting function module executed by a host device, and the handwriting function module updates display screen data in the video stream according to the touch trajectory data, so that the display screen data includes the touch trajectory data.

6. The electronic paper display device of claim 1, wherein when the second image buffer memory is swapped to receive the video stream to update next display data to the update buffer memory, the first image buffer memory receives next touch trajectory data and synchronously updates the next display data stored by the update buffer memory,

and the time schedule controller drives the electronic paper display panel according to the next display picture data.

7. An operating method of an electronic paper display device, the electronic paper display device including an electronic paper display panel and a timing controller, and the timing controller including a first image buffer memory, a second image buffer memory, and an update buffer memory, the operating method comprising:

receiving a video stream through the first image buffer memory and the second image buffer memory in an interleaved time sequence, wherein the first image buffer memory and the second image buffer memory are a ping-pong buffer memory architecture;

when the video streaming is received through the first image buffer memory to update the current display picture data into the update buffer memory, receiving touch track data through the second image buffer memory and synchronously updating the current display picture data stored in the update buffer memory; and

and driving the electronic paper display panel through the time sequence controller according to the current display picture data.

8. The method of claim 7, wherein the step of receiving the video stream via the first image buffer memory to update the current display frame data into the update buffer memory comprises:

receiving the video streaming through the first image buffer memory to temporarily store current background display data; and

and updating the background part in the current display picture data according to the current background display data through the updating buffer memory.

9. The operating method according to claim 8, wherein the step of receiving the touch trajectory data through the second image buffer memory, and synchronously updating the current display screen data stored in the update buffer memory comprises:

receiving a plurality of touch coordinate data of the touch trajectory data through the second image buffer memory in a continuous time sequence manner, so as to update previous background display data according to the touch coordinate data; and

and updating the touch track part in the current display picture data through the updating buffer memory according to the updated previous background display data.

10. The method of operation of claim 7, further comprising:

determining to output a plurality of driving waveforms to drive at least a portion of pixels of the electronic paper display panel according to a difference between the current display frame data and a display frame of the electronic paper display panel through the timing controller,

wherein the timing controller does not update a portion of the current display picture data stored in the update buffer memory corresponding to the at least a portion of the pixels before the plurality of driving waveforms have not been driven.

11. The method of operation of claim 7, further comprising:

the touch track data is transmitted back to a handwriting function module executed by a main control end device through the time sequence controller; and

and updating display picture data in the video streaming through the handwriting function module according to the touch track data so that the display picture data comprises the touch track data.

12. The method of operation of claim 7, further comprising:

when the second image buffer memory is switched to receive the video streaming to update the next display frame data to the update buffer memory, receiving the next touch track data through the first image buffer memory and synchronously updating the next display frame data stored in the update buffer memory; and

and driving the electronic paper display panel through the time sequence controller according to the next display picture data.