WO2025213351A1 - Electronic paper display apparatus and updating method therefor - Google Patents

Abstract

The present disclosure provides an electronic paper display apparatus and an updating method therefor. The electronic paper display apparatus comprises a liquid crystal display panel and a controller. The controller is configured for confirming whether an updating direction of a partial updating area is staggered with a historical updating direction of a historical updating area, so as to obtain a direction determination result. When the direction determination result is yes, the controller drives the liquid crystal display panel to perform full-screen updating. Thus, good display quality is provided.

Description

Electronic paper display device and updating method thereof Technical Field

The present disclosure relates to a display device and an updating method thereof, and more particularly to an electronic paper display device and an updating method thereof.

Background Art

Electronic paper displays with memory storage are becoming increasingly practical. However, the liquid crystal in these displays can exhibit varying bistability ratios at varying temperatures or over varying driving times, leading to significant variations in reflectivity. This can lead to discrepancies even when displaying the same data.

That is, when partial screen updates are repeated, due to the difference in reflectivity, there will be a problem of excessive brightness difference, which will lead to a decrease in the display quality of the electronic paper device.

Therefore, it can be seen that the current market lacks an electronic paper display device and an updating method that can avoid the large brightness difference that affects the display quality. Therefore, relevant industries are all looking for a solution.

Summary of the Invention

The present disclosure aims to provide an electronic paper display device and an update method thereof, which performs a full-screen update by confirming the update direction of a current partial update area and the correlation with a historical update area, thereby avoiding the problem of excessive brightness difference affecting the display quality.

According to one embodiment of the structural aspect of the present disclosure, an electronic paper display device is provided, comprising a liquid crystal display panel and a controller. The controller is electrically connected to the liquid crystal display panel and includes a display control module and an update direction determination module. The display control module is used to drive the liquid crystal display panel to display and update. The update direction determination module is electrically connected to the display control module and is used to obtain a portion of an update area from the display control module and determine whether an update direction of the portion of the update area intersects with a historical update direction of a historical update area to obtain a direction determination result. When the direction determination result is yes, the display control module drives the liquid crystal display panel to perform a full-screen update.

Other embodiments of the aforementioned implementation are as follows: the partial update area and the historical update area each include at least one rectangle, and the update direction determination module determines the update direction and the historical update direction respectively according to two coordinates of at least one rectangle of the partial update area and the two coordinates of at least one rectangle of the historical update area.

Other embodiments of the aforementioned embodiment are as follows: The electronic paper display device further includes a screen ratio determination module. The screen ratio determination module is electrically connected to the display control module and the update direction determination module, and is used to calculate a full screen ratio value of the partial update area and the historical update area.

Other embodiments of the aforementioned implementation manner are as follows: when the direction determination result in the update direction determination module is negative, the screen ratio determination module calculates the full screen ratio value.

Other embodiments of the aforementioned embodiment are as follows: The screen ratio determination module is further configured to determine whether the full screen ratio value is large or not. A predetermined value is used to obtain a ratio determination result. When the ratio determination result is yes, the display control module drives the liquid crystal display panel to perform a full screen update. When the ratio determination result is no, the display control module drives the liquid crystal display panel to perform a partial screen update based on the partial update area.

Other embodiments of the aforementioned embodiment are as follows: the electronic paper display device further includes a management module. The management module is electrically connected to the update direction determination module and the screen ratio determination module, and is used to manage the partial update area and the historical update area.

Other examples of the aforementioned implementation manner are as follows: when the direction determination result in the update direction determination module is yes, the management module clears the historical update area.

Other examples of the aforementioned implementation manner are as follows: when the screen proportion determination module determines that the proportion determination result is negative, the management module stores the partially updated area as a historical update area.

Other examples of the aforementioned embodiment are as follows: the predetermined value is between 0.4 and 0.6.

Other embodiments of the aforementioned embodiment are as follows: the electronic paper display device further includes a memory, which is electrically connected to the controller and is used to store the historical update area.

According to one embodiment of a method aspect of the present disclosure, a method for updating an electronic paper display device is provided, comprising: obtaining a portion of an update area via an update direction determination module of a controller; determining, via the update direction determination module, whether an update direction of the portion of the update area intersects with a historical update direction of a historical update area to obtain a direction determination result; and driving, via a display control module of the controller, a liquid crystal display panel to display and update based on the direction determination result. If the direction determination result is positive, the display control module drives the liquid crystal display panel to perform a full-screen update.

Other embodiments of the aforementioned implementation are as follows: the partial update area and the historical update area each include at least one rectangle, and the update direction determination module determines the update direction and the historical update direction respectively according to two coordinates of at least one rectangle of the partial update area and the two coordinates of at least one rectangle of the historical update area.

Other examples of the aforementioned embodiment are as follows: the updating method of the electronic paper display device further includes calculating a full screen ratio value of the partial update area and the historical update area by a screen ratio determination module when the direction determination result is negative.

Another embodiment of the aforementioned embodiment is as follows: The updating method of the electronic paper display device further includes determining, by a screen ratio determination module, whether a full screen ratio value is greater than a predetermined value to obtain a ratio determination result. When the ratio determination result is positive, the display control module drives the liquid crystal display panel to perform a full screen update. When the ratio determination result is negative, the display control module drives the liquid crystal display panel to perform a partial update based on the partial update area.

Other examples of the aforementioned embodiment are as follows: The updating method of the electronic paper display device further includes clearing the historical update area through a management module after the liquid crystal display panel performs a full-screen update.

Other examples of the aforementioned embodiment are as follows: The updating method of the electronic paper display device further includes storing the part of the updated area as a historical update area by the management module when the proportion determination result is negative.

Other examples of the aforementioned embodiment are as follows: the predetermined value is between 0.4 and 0.6.

According to another embodiment of the method of the present disclosure, a method for updating an electronic paper display device is provided, comprising: calculating a full screen ratio value of a portion of an update area and a historical update area by a screen ratio determination module of a controller. The screen ratio determination module determines whether the full screen ratio value is greater than a predetermined value to obtain a ratio determination result. A display control module of the controller drives a liquid crystal display panel to display and When the proportion determination result is yes, the display control module drives the liquid crystal display panel to perform full-screen update.

Other examples of the aforementioned embodiment are as follows: when the proportion determination result is negative, an update direction determination module is used to determine whether an update direction of the partial update area intersects with a historical update direction of the historical update area to obtain a direction determination result.

Other examples of the aforementioned embodiment are as follows: the full screen ratio is the combined area of the partial update area and the historical update area divided by the screen area of the liquid crystal display panel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a block diagram illustrating an electronic paper display device according to a first embodiment of the present disclosure;

FIG2 is a schematic diagram illustrating a partial update area and a historical update area in the first embodiment of FIG1 ;

FIG3 is a schematic flow chart illustrating a method for updating an electronic paper display device according to a second embodiment of the present disclosure;

FIG4 is a schematic diagram illustrating performing a full-screen update according to the update direction of FIG3 and the historical update direction interlaced;

FIG5 is a schematic diagram illustrating that a full-screen update is performed when the full-screen ratio value in FIG3 is greater than a predetermined value;

FIG6 is a schematic diagram illustrating executing a partial screen update when the full screen ratio value is less than a predetermined value according to FIG3 ; and

FIG. 7 is another schematic diagram illustrating executing a partial frame update when the full frame ratio value in FIG. 3 is smaller than a predetermined value.

The description of the accompanying drawings is as follows:

100: Electronic paper display device

110: LCD panel

111, 111a, 111b, 111c, 111d, 111e, 111f, 111g, 111h, 111i, 111j, 111k: Picture

120: Controller

121: Display control module

122: Update direction judgment module

123: Screen ratio judgment module

124: Management Module

130: Memory

200: Updating method of electronic paper display device

A: Partial update area

D: Update direction

HA: Historical Update Area

HD: Historical update direction

S01, S02, S03, S04, S05, S06, S07, S08: Steps

x1, y1: starting point

x2, y2: end point

DETAILED DESCRIPTION

The following describes various embodiments of the present disclosure with reference to the accompanying drawings. For clarity, many practical details will be included in the following description. However, it should be understood that these practical details should not be construed as limiting the present disclosure. In other words, these practical details are not essential for some embodiments of the present disclosure. Furthermore, to simplify the drawings, some commonly used structures and components are depicted in simplified schematic form; and duplicate components may be represented using the same reference numerals.

In addition, in this article, when a certain element (or unit or module, etc.) is "connected" to another element, it may mean that the element is directly connected to the other element, or it may mean that a certain element is indirectly connected to the other element, that is, there are other elements between the element and the other element. When it is explicitly stated that a certain element is "directly connected" to another element, it means that there are no other elements between the element and the other element. The terms "first", "second", "third", etc. are only used to describe different elements and do not limit the elements themselves. Therefore, the first element can also be renamed as the second element. Moreover, the combination of elements/units/circuits in this article is not a generally known, conventional or conventional combination in this field. Whether the elements/units/circuits themselves are conventional cannot be used to determine whether their combination relationship can be easily completed by ordinary knowledge in the technical field.

Referring to Figures 1 and 2, Figure 1 is a block diagram of an electronic paper display device according to a first embodiment of the present disclosure; and Figure 2 is a schematic diagram illustrating a partial update area and a historical update area in the first embodiment of Figure 1. The electronic paper display device 100 includes a liquid crystal display panel 110, a controller 120, and a memory 130. The controller 120 is electrically connected to the liquid crystal display panel 110 and the memory 130. The liquid crystal display panel 110 has a screen 111 for displaying an image (as shown in Figure 2). The controller 120 is used to control the liquid crystal display panel 110 to display and update the full screen or a portion of the screen. The memory 130 is used to store a historical update area HA. In the first embodiment, the liquid crystal display panel 110 may be a cholesteric liquid crystal display (ChLCD) display; the controller 120 may be a processor, a microprocessor, a central processing unit (CPU), a computer, a mobile device processor, a cloud processor or other electronic computing processor; the memory 130 may be a random access memory (RAM), a video random access memory (VRAM) or other type of dynamic storage device that can store information and instructions for execution by the controller 120, but the present disclosure is not limited to this.

The controller 120 includes a display control module 121, an update direction determination module 122, a screen ratio determination module 123, and a management module 124. The display control module 121 is electrically connected to the update direction determination module 122, the screen ratio determination module 123, and the management module 124. The update direction determination module 122 is electrically connected to the screen ratio determination module 123 and the management module 124. The screen ratio determination module 123 is electrically connected to the management module 124. The display control module 121 is used to drive the liquid crystal display panel 110 for display and update. The update direction determination module 122 is used to obtain a portion of the update area A from the display control module 121 and determine whether an update direction D of the portion of the update area A intersects with a historical update direction HD of the historical update area HA to obtain a direction determination result.

In the first embodiment, the partial update area A is the area where the current display control module 121 is driving the liquid crystal display panel 110 to perform a partial update on the screen 111, and the historical update area HA is the area where the display control module 121 is driving the liquid crystal display panel 110 to perform a partial update after performing a full screen update. The partial update area A and the historical update area HA each include at least one rectangle (as shown in FIG. 2 ), and one side of each rectangle is equal to the screen length of the liquid crystal display panel 110. One of the sides of the surface 111 is equal in length. The update direction determination module 122 determines the update direction D and the historical update direction HD respectively based on the two coordinates of the rectangles corresponding to the partial update area A and the historical update area HA. For example, as shown in FIG2 , since one of the sides of the partial update area A is equal in length to the long side of the screen 111, the update direction determination module 122 defines the coordinates of the partial update area A on the short side of the screen 111 as the starting point x1 and the end point x2, and according to the change in the coordinates of the starting point x1 and the end point x2, it can be determined that the update direction D is the X-axis direction; since one of the sides of the historical update area HA is equal in length to the short side of the screen 111, the update direction determination module 122 defines the coordinates of the historical update area HA on the long side of the screen 111 as the starting point y1 and the end point y2, and according to the change in the coordinates of the starting point y1 and the end point y2, it can be determined that the historical update direction HD is the Y-axis direction.

Thus, by confirming whether the update direction D of the partial update area A intersects with the historical update direction HD of the historical update area HA, it is possible to immediately determine whether the partial update area A and the historical update area HA overlap, thereby instantly performing full-screen update to avoid the problem of low display quality.

The screen ratio determination module 123 is used to calculate a full screen ratio of the partial update area A and the historical update area HA, and to determine whether the full screen ratio is greater than a predetermined value to obtain a ratio determination result. The management module 124 is used to manage the partial update area A and the historical update area HA based on the ratio determination result. It should be noted that, when the partial update area A and the historical update area HA do not overlap, the full screen ratio is the sum of the partial update area A and the historical update area HA divided by the area of the screen 111 of the liquid crystal display panel 110; and when the partial update area A and the historical update area HA overlap, the full screen ratio is the union area of the partial update area A and the historical update area HA divided by the area of the screen 111 of the liquid crystal display panel 110. It should be noted that the detailed features of the screen ratio determination module 123 will be described in conjunction with the following Figures 2, 5, 6 and 7.

Referring to Figures 1, 2, and 3, Figure 3 is a flow chart illustrating an update method for an electronic paper display device according to a second embodiment of the present disclosure. The electronic paper display device 100 is configured to implement the update method 200 for an electronic paper display device. It should be noted that the update method 200 for an electronic paper display device according to the present disclosure is not limited to implementation by the electronic paper display device 100. The update method 200 for an electronic paper display device includes steps S01, S02, and S03, which are sequentially executed. In step S01, the update direction determination module 122 obtains a partial update area A from the display control module 121. In step S02, the update direction determination module 122 determines whether an update direction D of the partial update area A intersects with a historical update direction HD of a historical update area HA to obtain a direction determination result. In step S03, the display control module 121 drives the liquid crystal display panel 110 to perform a full-screen update based on the direction determination result.

In addition, the updating method 200 of the electronic paper display device may further include step S04 executed after step S03 . In step S04 , the LCD panel 110 clears the historical update area HA stored in the memory 130 via the management module 124 .

Refer to FIG1, FIG3 and FIG4, wherein FIG4 is a schematic diagram illustrating the execution of a full-screen update according to the update direction of FIG3 and the historical update direction. FIG4 is a diagram illustrating a scenario where the direction determination result is yes. In step S01, the update direction determination module 122 confirms that the update direction D of the partial update area A is the X-axis direction and the historical update direction HD of the historical update area HA is the Y-axis direction (as shown in the screen 111a). Therefore, in step S02, it is determined that If the update direction D intersects with the historical update direction HD and the direction determination result is yes, step S03 is executed. In step S03, the display control module 121 drives the LCD panel 110 to perform a full-screen update (as shown in screen 111b). In step S04, since the full-screen update has been performed, the management module 124 clears the historical update area HA from the memory 130. This prevents repeated partial screen updates from causing noticeable brightness differences and, consequently, poor display quality.

In addition, the updating method 200 of the electronic paper display device may further include steps S05, S06 and S07, which are sequentially executed after step S02, and step S03 may be further executed after step S06. When the direction judgment result in step S02 is no, step S05 is executed to calculate the full screen ratio value of the partial update area A and the historical update area HA through the screen ratio judgment module 123. In step S06, the screen ratio judgment module 123 determines whether the full screen ratio value is greater than the predetermined value to obtain the ratio judgment result. In step S07, the display control module 121 drives the liquid crystal display panel 110 to perform a partial update based on the partial update area A. In the second embodiment, the predetermined value is between 0.4 and 0.6, and preferably, the predetermined value is 0.5.

Specifically, if the result of the ratio determination in step S06 is yes, step S03 is executed to drive the LCD panel 110 through the display control module 121 to perform a full-screen update. If the result of the ratio determination is no, step S07 is executed to drive the LCD panel 110 through the display control module 121 to perform a partial update based on the partial update area A. It should be noted that if the partial update area A does not overlap with the historical update area HA, the display control module 121 only drives the LCD panel 110 to perform a partial update based on the partial update area A. If the partial update area A overlaps with the historical update area HA, the display control module 121 drives the LCD panel 110 to perform a partial update based on the union of the partial update area A and the overlapping historical update area HA.

Referring to Figures 1, 3, and 5, Figure 5 is a schematic diagram illustrating a full-screen update performed in accordance with the full-screen ratio value of Figure 3 being greater than a predetermined value. In Figure 5, a scenario is described in which the direction determination result of the update direction determination module 122 is negative, the ratio determination result calculated by the screen ratio determination module 123 is positive, and the predetermined value is 0.5. In step S01, the update direction determination module 122 confirms that the update direction D of the partial update area A and the historical update direction HD of the historical update area HA are both in the X-axis direction (as shown in screen 111c). Therefore, in step S02, if the update direction D and the historical update direction HD are determined to be non-intersecting, the direction determination result is negative, and step S05 is subsequently executed. In step S05, the screen ratio determination module 123 divides the sum of the partial update area A and the historical update area HA by the full-screen area of the liquid crystal display panel 110 (as shown in screen 111d), and obtains a full-screen ratio value of 0.6. Therefore, in step S06, the screen ratio determination module 123 determines that the full screen ratio value is greater than the predetermined value (0.6>0.5), and the result of the ratio determination is yes, so the process proceeds to step S03. In step S03, the display control module 121 drives the LCD panel 110 to perform a full screen update (as shown in screen 111e). In step S04, since the full screen update has been performed, the management module 124 clears the historical update area HA from the memory 130.

It should be noted that steps S05 and S06 of the electronic paper display device update method 200 are not limited to being performed after step S02 and can be performed before step S01 as needed. Specifically, the electronic paper display device update method 200 can first determine whether to perform a full-screen update based on the screen ratio determination result by the screen ratio determination module 123. Then, the update direction determination module 122 can reconfirm whether to perform a full-screen update based on the direction determination result. However, this disclosure is not limited to this.

The updating method 200 of the electronic paper display device may further include step S08 executed after step S07 . In step S08 , the management module 124 stores the partially updated area A as a historical update area HA.

Referring to Figures 1, 3, and 6, Figure 6 illustrates a schematic diagram of performing a partial screen update based on the full screen ratio value in Figure 3 being less than a predetermined value. Figure 6 illustrates a scenario where the direction determination result of the update direction determination module 122 is negative, the screen ratio determination result calculated by the screen ratio determination module 123 is negative, and the predetermined value is 0.5. The execution of steps S01 and S02 (as shown in screen 111f) is the same as in the scenario described above in Figure 5 and will not be further described here. In step S05, the screen ratio determination module 123 divides the sum of the partial update area A and the historical update area HA by the full screen area of the liquid crystal display panel 110 (as shown in screen 111g), obtaining a full screen ratio value of 0.33. Therefore, in step S06, the screen ratio determination module 123 determines that the full screen ratio value is not greater than the predetermined value (0.33<0.5), and the screen ratio determination result is negative, and the process proceeds to step S07. In step S07, the display control module 121 drives the LCD panel 110 to perform a partial screen update based on the partial update area A. In step S08, the management module 124 integrates the partial update range (partial update area A) with the historical update area HA and stores the result as the historical update area HA (as shown in screen 111h).

Referring to Figures 1, 3, and 7, Figure 7 illustrates another schematic diagram of performing a partial screen update based on the full screen ratio value in Figure 3 being less than a predetermined value. Figure 7 illustrates another scenario in which the direction determination result of the update direction determination module 122 is negative, the ratio determination result calculated by the screen ratio determination module 123 is negative, and the predetermined value is 0.5. The difference between the scenario in Figure 7 and the scenario in Figure 6 is that the partial update area A and the historical update area HA in the scenario in Figure 7 partially overlap. Furthermore, the execution of steps S01 and S02 (as shown in frame 111i) is the same as in the scenario in Figure 5 and will not be further described here. In step S05, because the partial update area A and the historical update area HA partially overlap, the screen ratio determination module 123 divides the union range of the partial update area A and the historical update area HA by the full screen area of the LCD panel 110 (as shown in frame 111j), resulting in a full screen ratio value of 0.25. Therefore, in step S06, the screen ratio determination module 123 determines that the full screen ratio value is not greater than the predetermined value (0.25 < 0.5), and the screen ratio determination result is negative, and the process proceeds to step S07. In step S07, the display control module 121 drives the LCD panel 110 to perform a partial screen update based on the union of the partial update area A and the historical update area HA. In step S08, the management module 124 stores the partial update range (the union of the partial update area A and the historical update area HA) as the historical update area HA (as shown in screen 111k).

As can be seen from the above embodiments, the present disclosure has the following advantages: by confirming the update direction of the partial update area and the historical update area, and further confirming the screen ratio of the partial update area and the historical update area, a full screen update can be performed immediately, which can effectively avoid the problem of low display quality caused by repeated partial screen updates.

Although the present disclosure has been disclosed above with reference to the embodiments, they are not intended to limit the present disclosure. Anyone with ordinary knowledge in the art may make slight changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the appended claims.

Claims (20)

An electronic paper display device, comprising: a liquid crystal display panel; and A controller electrically connected to the liquid crystal display panel and comprising: a display control module for driving the liquid crystal display panel to display and update; and an update direction determination module electrically connected to the display control module and configured to obtain a portion of the update area from the display control module and determine whether an update direction of the portion of the update area intersects with a historical update direction of a historical update area to obtain a direction determination result; When the direction determination result is yes, the display control module drives the liquid crystal display panel to perform full-screen update. The electronic paper display device of claim 1 , wherein the partial update area and the historical update area each include at least one rectangle, and the update direction determination module determines the update direction and the historical update direction based on two coordinates of the at least one rectangle of the partial update area and the two coordinates of the at least one rectangle of the historical update area, respectively. The electronic paper display device according to claim 1, further comprising: A screen ratio determination module is electrically connected to the display control module and the update direction determination module, and is used to calculate a full screen ratio value of the partial update area and the historical update area. The electronic paper display device according to claim 3, wherein: When the direction determination result in the update direction determination module is negative, the screen ratio determination module calculates the full screen ratio value. The electronic paper display device of claim 3, wherein the screen ratio determination module is further configured to determine whether the full screen ratio is greater than a predetermined value to obtain a ratio determination result; When the proportion determination result is yes, the display control module drives the liquid crystal display panel to perform full screen update; When the proportion determination result is negative, the display control module drives the liquid crystal display panel to perform partial screen update according to the partial update area. The electronic paper display device according to claim 5, further comprising: A management module is electrically connected to the update direction determination module and the screen ratio determination module, and is used to manage the partial update area and the historical update area. The electronic paper display device according to claim 6, wherein: When the direction determination result in the update direction determination module is yes, the management module clears the historical update area. The electronic paper display device according to claim 6, wherein: When the screen proportion determination module determines that the proportion is negative, the management module stores the partially updated area as the historical update area. The electronic paper display device according to claim 5, wherein the predetermined value is between 0.4 and 0.6. The electronic paper display device according to claim 1, further comprising: A memory is electrically connected to the controller and used for storing the historical update area. A method for updating an electronic paper display device, comprising: Obtaining a portion of the update area through an update direction determination module of a controller; Determining, by the update direction determination module, whether an update direction of the partial update area intersects with a historical update direction of a historical update area to obtain a direction determination result; and A display control module of the controller drives a liquid crystal display panel to display and update according to the direction determination result; When the direction determination result is yes, the display control module drives the liquid crystal display panel to perform full-screen update. The updating method of the electronic paper display device according to claim 11, wherein the partial update area and the historical update area each include at least one rectangle, and the update direction determination module determines the update direction and the historical update direction based on two coordinates of the at least one rectangle of the partial update area and the two coordinates of the at least one rectangle of the historical update area, respectively. The updating method of the electronic paper display device according to claim 11, further comprising: When the direction determination result is negative, a full screen ratio of the partial update area and the historical update area is calculated by a screen ratio determination module. The updating method of the electronic paper display device according to claim 13, further comprising: Determining whether the full screen ratio is greater than a predetermined value by the screen ratio determination module to obtain a ratio determination result; When the proportion determination result is yes, the display control module drives the liquid crystal display panel to perform full screen update; When the proportion determination result is negative, the display control module drives the liquid crystal display panel to perform a partial update according to the partial update area. The updating method of the electronic paper display device according to claim 14, further comprising: After the liquid crystal display panel executes full screen update, the historical update area is cleared through a management module. The updating method of the electronic paper display device according to claim 15, further comprising: When the proportion determination result is negative, the management module stores the partially updated area as the historical update area. The updating method of the electronic paper display device according to claim 14, wherein the predetermined value is between 0.4 and 0.6. A method for updating an electronic paper display device, comprising: Calculating a full screen ratio value of a portion of the update area and a historical update area through a screen ratio determination module of a controller; Determining whether the full screen ratio is greater than a predetermined value by the screen ratio determination module to obtain a ratio determination result; and A display control module of the controller drives a liquid crystal display panel to display and update according to the proportion determination result; When the proportion determination result is yes, the display control module drives the liquid crystal display panel to perform full-screen update. The updating method of the electronic paper display device according to claim 18, wherein: When the proportion determination result is negative, an update direction determination module is used to determine whether an update direction of the partial update area intersects with a historical update direction of the historical update area to obtain a direction determination result. The updating method of the electronic paper display device according to claim 18, wherein the full screen ratio is a union area of the partial update area and the historical update area divided by the screen area of the liquid crystal display panel.