CN108877527B - Foldable display device, driving method thereof and electronic equipment - Google Patents

Foldable display device, driving method thereof and electronic equipment Download PDF

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Publication number
CN108877527B
CN108877527B CN201810715263.9A CN201810715263A CN108877527B CN 108877527 B CN108877527 B CN 108877527B CN 201810715263 A CN201810715263 A CN 201810715263A CN 108877527 B CN108877527 B CN 108877527B
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display
driving circuit
display area
area
image
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CN108877527A (en
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刘俊恺
孔祥梓
杨阳
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Wuhan Tianma Microelectronics Co Ltd
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Shanghai Tianma AM OLED Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Electroluminescent Light Sources (AREA)
  • Liquid Crystal (AREA)

Abstract

The application discloses a foldable display device, a driving method thereof and an electronic device, wherein the foldable display device comprises a first display panel, a second display panel and a connecting part, wherein a second display area of the first display panel is connected with the first display area and extends from a first plane to a first side surface; the fourth display area of the second display panel is connected with the third display area and extends from the second plane to the second side surface, so that when the connecting part is in the first connecting state, the part of the second display area, which is positioned on the first side surface, is opposite to the part of the fourth display area, which is positioned on the second side surface, and the part of the second display area, which is positioned on the first plane, is seamlessly connected with the part of the fourth display area, which is positioned on the second plane, thereby achieving the purpose of eliminating the non-display area at the splicing part of the two display panels in the foldable display device and improving the display effect of the foldable display device when the connecting part is in the first connecting state.

Description

Foldable display device, driving method thereof and electronic equipment
Technical Field
The present disclosure relates to the field of display device technologies, and more particularly, to a foldable display device, a driving method thereof, and an electronic device.
Background
With the continuous development of display technology, various display devices are emerging, wherein a foldable display device formed by splicing two display panels is more and more popular with users in various using modes.
Referring to fig. 1 and 2, fig. 1 and 2 are schematic external views of a foldable display device, where the foldable display device is formed by splicing a first screen a and a second screen B, and connection and information interaction between the two screens are realized in the form of a Flexible Printed Circuit (FPC) at the splice between the first screen a and the second screen B; in fig. 2, the second screen B of the foldable display device is bent at an angle a along a connection line with the first screen a for displaying, so as to meet various use requirements of users.
However, in such a foldable display device, since the first screen a and the second screen B both have a frame area surrounding the display area, the joint of the first screen a and the second screen B has a large non-display area UN, which adversely affects the display effect of the foldable display device.
Disclosure of Invention
In order to solve the above technical problem, the present application provides a foldable display device, a driving method thereof, and an electronic device, so as to achieve the purpose of eliminating a non-display area at a joint of two display panels in the foldable display device.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
a foldable display device comprising: the display device comprises a first display panel, a second display panel and a connecting part; wherein,
the first display panel comprises a first plane, a first side face connected with the first plane, a first display area, a second display area and a first driving circuit, wherein the first display area is arranged on the first plane, and the second display area is connected with the first display area and extends to the first side face from the first plane;
the second display panel comprises a second plane, a second side surface connected with the second plane, a third display area, a fourth display area and a second driving circuit, wherein the third display area is arranged on the second plane, and the fourth display area is connected with the third display area and extends to the second side surface from the second plane;
the connecting part comprises a first connecting state;
when the connecting part is in a first connecting state, the first side surface and the second side surface are attached together through the connecting part, the first driving circuit and the second driving circuit are electrically connected through the connecting part, and the first driving circuit and the second driving circuit control the first display area, the second display area, the third display area and the fourth display area to display together.
An electronic device, comprising: a foldable display device as claimed in one of the preceding claims.
A driving method of a foldable display device, applied to the foldable display device of one of the above items, the driving method of the foldable display device comprising:
when the connecting part is in a first connecting state, the first driving circuit and the second driving circuit control the first display area, the second display area, the third display area and the fourth display area to display together.
As can be seen from the foregoing technical solutions, embodiments of the present application provide a foldable display device, a driving method thereof, and an electronic device, where the foldable display device includes a first display panel, a second display panel, and a connecting portion, where a second display region of the first display panel is connected to the first display region and extends from a first plane to a first side; the fourth display area of the second display panel is connected with the third display area and extends from the second plane to the second side surface, so that when the connecting part is in the first connecting state, the part of the second display area, which is positioned on the first side surface, is opposite to the part of the fourth display area, which is positioned on the second side surface, and the part of the second display area, which is positioned on the first plane, is seamlessly connected with the part of the fourth display area, which is positioned on the second plane, thereby achieving the purpose of eliminating the non-display area at the splicing part of the two display panels in the foldable display device and improving the display effect of the foldable display device when the connecting part is in the first connecting state.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is an external view of a foldable display device in the prior art;
FIG. 2 is a schematic diagram of a foldable display device according to the prior art;
fig. 3 is an external view of a first display panel according to an embodiment of the present application;
fig. 4 is an external view of a second display panel according to an embodiment of the present application;
fig. 5 is an external view schematically illustrating a foldable display device according to an embodiment of the present application;
fig. 6 is a schematic diagram illustrating a display effect of a foldable display device according to an embodiment of the present application;
fig. 7 is an expanded structural diagram of a first plane and a first side of a first display panel according to an embodiment of the present application;
fig. 8 is an expanded structural diagram of a second plane and a second side of a second display panel according to an embodiment of the present application;
fig. 9 is an external view of a first display panel according to another embodiment of the present application;
fig. 10 is an external view of a second display panel according to another embodiment of the present application;
fig. 11 is a schematic view illustrating a display effect of a first display panel when a connection portion is in a disconnected state according to an embodiment of the present application;
fig. 12 is a schematic view illustrating a display effect of a second display panel when a connection portion is in a disconnected state according to an embodiment of the present application;
fig. 13 is an external view of a foldable display device provided in an embodiment of the present application when the connection portion is in the second connection state;
fig. 14 is a flowchart illustrating a driving method of a foldable display device according to an embodiment of the present application;
fig. 15 is a flowchart illustrating a driving method of a foldable display device according to another embodiment of the present application;
fig. 16 is a flowchart illustrating a driving method of a foldable display device according to still another embodiment of the present application;
fig. 17 is a flowchart illustrating a driving method of a foldable display device according to still another embodiment of the present application;
fig. 18 is a flowchart illustrating a driving method of a foldable display device according to an alternative embodiment of the present application;
fig. 19 is a flowchart illustrating a driving method of a foldable display device according to another alternative embodiment of the present application;
fig. 20 is a flowchart illustrating a driving method of a foldable display device according to yet another alternative embodiment of the present application;
fig. 21 is a flowchart illustrating a driving method of a foldable display device according to still another alternative embodiment of the present application;
fig. 22 is a flowchart illustrating a driving method of a foldable display device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An embodiment of the present application provides a foldable display device, as shown in fig. 3, fig. 4 and fig. 5, fig. 3 is an appearance schematic diagram of a first display panel, fig. 4 is an appearance schematic diagram of a second display panel, and fig. 5 is an appearance schematic diagram of the foldable display device; the foldable display device includes: a first display panel 10, a second display panel 20, and a connection part; wherein,
the first display panel 10 includes a first plane, a first side surface connected to the first plane, a first display area 11, a second display area 12, and a first driving circuit, the first display area 11 is disposed on the first plane, and the second display area 12 is connected to the first display area 11 and extends from the first plane to the first side surface;
the second display panel 20 includes a second plane, a second side surface connected to the second plane, a third display region 21, a fourth display region 22, and a second driving circuit, the third display region 21 is disposed on the second plane, and the fourth display region 22 is connected to the third display region 21 and extends from the second plane to the second side surface;
the connecting part comprises a first connecting state;
when the connecting part is in a first connecting state, the first side surface and the second side surface are attached together through the connecting part, the first driving circuit and the second driving circuit are electrically connected through the connecting part, and the first driving circuit and the second driving circuit control the first display area 11, the second display area 12, the third display area 21 and the fourth display area 22 to display together.
In this embodiment, referring to fig. 3 and 4, the width of the portion of the second display region 12 of the first display panel 10 located on the first plane may be set according to actual requirements; similarly, the width of the portion of the fourth display area 22 of the second display panel 20 located on the second plane may also be set according to actual requirements; for example, optionally, the width of the second display area 12 in the first plane is the same as the width of the frame area of the first display area 11 away from the second display area 12; the width of the fourth display area 22 on the second plane is the same as the width of the frame area of the third display area 21 away from the fourth display area 22. Of course, in some embodiments of the present application, the width of the second display area 12 in the first plane may also be different from the width of the border area of the first display area 11 away from the second display area 12; the width of the fourth display area 22 in the second plane may be different from the width of the frame area of the third display area 21 away from the fourth display area 22. This is not a limitation of the present application.
Still referring to fig. 3 and 4, the first side of the first display panel 10 may still be provided with a frame region for disposing traces or circuit structures of the display panel, etc. except for the second display region 12; similarly, the second side of the second display panel 20 may also be provided with a frame region for arranging traces or circuit structures of the display panel, in addition to the fourth display region 22.
In an embodiment of the present application, optionally, the first display panel 10 and the second display panel 20 are both Organic Light Emitting Diode (OLED) display panels; the organic light emitting display panel has a bendable characteristic, and when the first display panel 10 and the second display panel 20 are both organic light emitting display panels, the first display panel 10 can be arranged in the display area of the first side surface and the second display panel 20 can be arranged in the display area of the second side surface by bending the organic light emitting display panels.
The connection part may include an FPC (Flexible Printed Circuit) and a connection terminal detachably connected to the FPC; a data plug and a data interface that mates with the data plug may also be included. When the connecting portion is composed of a data plug and a data jack, the data jack and the data jack may be respectively disposed on the first display panel 10 and the second display panel 20, and in order to beautify the appearance, a pull-out structure may be disposed on the first display panel 10 or the second display panel 20, so that the data plug protrudes from the surface of the display panel through the pull-out structure when the data plug is needed, and the data plug is hidden through the pull-out structure when the data plug is not needed.
When the connecting part is in the first connecting state, the first display panel 10 and the second display panel 20 can realize data interaction through the connecting part, so that the first driving circuit and the second driving circuit can realize common display of the first display area 11, the second display area 12, the third display area 21 and the fourth display area 22, and because the part of the second display area 12 on the first side surface and the part of the fourth display area 22 on the second side surface are blocked, in the display process, the parts of the first display area 11, the second display area 12 on the first plane, the third display area 21 and the fourth display area 22 on the second plane are mainly displayed, the same picture is displayed together, and at this time, because the part of the second display area 12 on the first plane and the part of the fourth display area 22 on the second plane are connected seamlessly, therefore, the purpose of eliminating the non-display area at the splicing part of the two display panels in the foldable display device is realized, and the display effect of the foldable display device when the connecting part is in the first connecting state is improved.
Optionally, the connection portion further includes a disconnected state, when the connection portion is in the disconnected state, the first display panel 10 and the second display panel 20 are separated, the first driving circuit is configured to control the first display area 11 and the second display area 12 to display, and the second driving circuit is configured to control the third display area 21 and the fourth display area 22 to display. In this embodiment, when the connection portion is in the disconnected state, the first display panel 10 and the second display panel 20 are separated, and can be used as two separate display devices, and there is no data interaction between the first driving circuit and the second driving circuit, and the first driving circuit controls the first display area 11 and the second display area 12 to display; the second driving circuit controls the third display area 21 and the fourth display area 22 to display.
For a more clear description, the following embodiments focus on the display process of each region when the connection part is in the first connection state or the disconnection state.
On the basis of the above embodiments, in one embodiment of the present application, when the connection portion is in the first connection state, the first and second driving circuits control the first, second, third, and fourth display regions to collectively display a specific function,
the first driving circuit controls a first preset area to display a first sub-image, wherein the first preset area comprises a part of the second display area, which is located on the first plane, and the first display area;
the second driving circuit controls a second preset area to display a second sub-image, the second preset area comprises a part of the fourth display area, which is located on the second plane, and the third display area, and the first sub-image and the second sub-image form an image to be displayed.
In this embodiment, referring to fig. 6, fig. 6 is a schematic view illustrating a display effect of each display area when the connection portion is in the first connection state; when the first side and the second side of the first display panel 10 and the second display panel 20 are bonded together through the connecting part to control the first display area, the second display area, the third display area and the fourth display area to be commonly used for displaying, an image to be displayed is divided into a first sub-image im1 and a second sub-image im2, the first driving circuit controls a display area (i.e. a first preset area) on one side of the joint 30 of the first display panel 10 and the second display panel 20 to display the first sub-image im1, and the second driving circuit controls a display area (i.e. a second preset area) on the other side of the joint 30 of the first display panel 10 and the second display panel 20 to display the second sub-image im2, so that the complete display of the image to be displayed is completed. And because the first preset area of the first display panel 10 is adjacent to the second preset area of the second display panel 20, no frame area of any display panel exists in the middle, and thus no non-display area is formed in the middle of the image to be displayed.
Specifically, in one embodiment of the present application, a specific process is provided in which the first and second driving circuits control the first, second, third, and fourth display regions to collectively display, specifically when the connection portion is in the first connection state, including:
the first driving circuit and the second driving circuit are used for controlling the thin film transistors corresponding to the display pixels in the same row in the first preset area and the second preset area to be turned on in the same time period;
the first driving circuit is further used for transmitting a data signal containing information of a first sub-image im1 corresponding to the row of the display pixel corresponding to the opened thin film transistor to the display pixel corresponding to the opened thin film transistor in the first preset area, and transmitting a starting signal to the second driving circuit after the transmission of the data signal is finished;
the second driving circuit is further configured to transmit a data signal including information of a second sub-image im2 corresponding to the row of the display pixel corresponding to the turned-on thin film transistor in the second preset region after receiving the start signal, where the first sub-image im1 and the second sub-image im2 constitute an image to be displayed.
Referring to fig. 7 and 8, fig. 7 is a schematic view illustrating an expanded structure of a first plane and a first side of the first display panel 10, and fig. 8 is a schematic view illustrating an expanded structure of a second plane and a second side of the second display panel 20; in fig. 7 and 8, the first display panel 10 and the second display panel 20 are both OLED display panels for illustration, and at this time, the first driving circuit includes a first gate driving circuit, a second gate driving circuit, and a first data driving circuit; the second driving circuit comprises a third gate driving circuit, a fourth gate driving circuit and a second data driving circuit; the display area includes a plurality of gate lines 50 and data lines 40 arranged to cross each other, and a plurality of display pixels LA located at intersections of the gate lines 50 and the data lines 40; the gate lines 50 of the first display area 11 and the second display area 12 are electrically connected to the first gate driving circuit and the second gate driving circuit, respectively, and the data lines 40 of the first display area 11 and the second display area 12 are electrically connected to the first data driving circuit; the gate lines 50 of the third display area 21 and the fourth display area 22 are electrically connected to the third gate driving circuit and the fourth gate driving circuit, respectively, and the data lines 40 of the third display area 21 and the fourth display area 22 are electrically connected to the second data driving circuit. In the OLED display panel, the pixel circuit in each display pixel LA generally includes a plurality of thin film transistors, and the currently mainstream pixel circuit applied to the OLED display panel includes 7 thin film transistors and 1 capacitor (7T1C), and the specific pixel circuit structure is well known by those skilled in the art and is not described herein. In the working process, the first gate driving circuit and the second gate driving circuit control the thin film transistors corresponding to one row of display pixels LA in the first display area 11 and the second display area 12 to be turned on, and the third gate driving circuit and the fourth gate driving circuit control the thin film transistors corresponding to the same row of display pixels LA in the third display area 21 and the fourth display area 22 to be turned on, so that the data driving circuits of the two display panels can transmit data signals to the display pixels LA through the turned-on thin film transistors.
In this embodiment, after the data signal transmission is completed, the first driving circuit further transmits a start signal to the second driving circuit, where the start signal is used to indicate to the second driving circuit that the data signal transmission of the row of the first driving circuit is completed, and at this time, after receiving the start signal, the second driving circuit starts to transmit a data signal containing second sub-image information corresponding to the row of the display pixel LA corresponding to the opened thin film transistor to the display pixel LA corresponding to the opened thin film transistor through the opened thin film transistor, so as to achieve the purpose of cooperatively displaying an image to be displayed by the first display panel 10 and the second display panel 20.
It should be noted that the gate driving method shown in fig. 7 and 8 is only an example, and other driving methods such as a single-side driving gate driving method and a double-side driving gate driving method may be used instead of the cross-driving gate driving method shown in fig. 7 and 8.
In another alternative embodiment of the present application, still referring to fig. 7 and 8, when the connection portion is in the first connection state, the first and second driving circuits control the first display area 11, the second display area 12, the third display area 21 and the fourth display area 22 to jointly display a specific function,
the first driving circuit and the second driving circuit are used for controlling the thin film transistors corresponding to the display pixels LA in the same row in the first preset area and the second preset area to be turned on in the same time period, the thin film transistor corresponding to the display pixel LA in a dotted line frame K1 in fig. 7 is in an on state, and the thin film transistor corresponding to the display pixel LA in a dotted line frame K2 in fig. 8 is in an on state;
the first driving circuit is further configured to send a preloading signal to the second driving circuit, transmit a data signal including first sub-image information corresponding to a row of the display pixel LA corresponding to the turned-on tft to the display pixel LA corresponding to the turned-on tft in the first preset region, and transmit a start signal to the second driving circuit after the data signal is transmitted;
the second driving circuit is further configured to preload a data signal including second sub-image information corresponding to a row of the display pixel LA corresponding to the turned-on tft after receiving the preload signal, and transmit the data signal including second sub-image information corresponding to the row of the display pixel LA corresponding to the turned-on tft to the display pixel LA corresponding to the turned-on tft in the second preset area after receiving the start signal, where the first sub-image and the second sub-image constitute an image to be displayed.
In this embodiment, the first driving circuit is further configured to send a preload signal to the second driving circuit, so that when the first driving circuit transmits a data signal including first sub-image information corresponding to a row of the display pixel LA corresponding to the opened thin film transistor to the display pixel LA corresponding to the opened thin film transistor in the first preset region, the second driving circuit may preload the data signal including second sub-image information corresponding to the row of the display pixel LA corresponding to the opened thin film transistor after receiving the preload signal, so as to reduce loading time of the data signals after receiving a start signal sent by the first driving circuit, thereby reducing an overall time for the foldable display device to display an image and improving display smoothness of the foldable display device.
The following describes a display process of each display area when the connection portion is in the disconnected state.
Referring to fig. 9 and 10, fig. 9 is a schematic structural exterior view of the first display panel, and fig. 10 is a schematic structural exterior view of the second display panel;
the first display panel 10 further includes a first bezel region 13 surrounding the first and second display regions 11 and 12;
the second display panel 20 further includes a second bezel region 23 surrounding the third and fourth display regions 21 and 22;
the first driving circuit is disposed in the first frame region 13;
the second driving circuit is disposed in the second frame region 23.
The first and second driving circuits may be distributed in the first and second bezel areas 13 and 23 in a manner as described with reference to the first and second panels shown in fig. 7 and 8.
In one embodiment of the present application, when the connection portion is in the off state, the first driving circuit is configured to control the first display region 11 and the second display region 12 to display a specific function,
the first driving circuit controls the first display area 11 to display an image to be displayed, and controls the second display area 12 to display a first preset pattern, where the first preset pattern is the same as a pattern on the surface of the first border area 13.
When the connecting part is in an open state, the second driving circuit is used for controlling the third display area 21 and the fourth display area 22 to display specific information,
the second driving circuit controls the third display area 21 to display an image to be displayed, and controls the fourth display area 22 to display a second preset pattern, where the second preset pattern is the same as the pattern on the surface of the second frame area 23.
In this embodiment, referring to fig. 11 and 12, fig. 11 is a schematic diagram of a display effect of the first display panel 10 when the connection portion is in a disconnected state, and fig. 12 is a schematic diagram of a display effect of the second display panel 20 when the connection portion is in a disconnected state; when the connection portion is in the disconnected state, the first driving circuit controls the first display area 11 to normally display an image to be displayed, and controls the second display area 12 to display a first preset pattern, so that the appearance of the first border area 13 is simulated and displayed in the second display area 12, and therefore when the first display panel 10 is independently displayed, the pattern displayed on the first surface of the first display panel 10 is symmetrical, and the visual aesthetic requirement of a user is met.
Similarly, when the connection portion is in the disconnected state, the second driving circuit controls the third display area 21 to normally display an image to be displayed, and controls the fourth display area 22 to display a second preset pattern, so as to simulate and display the appearance of the second bezel area 23 in the fourth display area 22, so that when the second display panel 20 is separately displayed, the pattern displayed on the second surface of the second display panel 20 has symmetry, and meets the aesthetic visual requirement of a user.
In this embodiment, the scheme that the first driving circuit controls the second display area 12 to display the first preset pattern, and the second driving circuit controls the fourth display area 22 to display the second preset pattern may be applied to the case that the patterns of the first frame area 13 and the second frame area 23 are variable.
When the appearance of the first frame area 13 and the second frame area 23 is the same as the appearance of the display panel in the closed state, and when the connection portion is in the disconnected state, the first driving circuit is configured to control the first display area 11 and the second display area 12 to display a specific image,
the first driving circuit controls the first display area 11 to display an image to be displayed and controls the second display area 12 to be in a closed state;
when the connecting part is in an open state, the second driving circuit is used for controlling the third display area 21 and the fourth display area 22 to display specific information,
the second driving circuit controls the third display area 21 to display the image to be displayed, and controls the fourth display area 22 to be in a closed state.
The logic of the first driving circuit controlling the second display region 12 to be in the off state and the second driving circuit controlling the fourth display region 22 to be in the off state in this embodiment is suitable for the case that the appearance of the display region is the same as that of the frame region when the display region is in the off state, and in this case, only one display region of the first display panel 10 and the second display panel 20 operates normally when they operate independently, which is beneficial to reducing the overall power consumption.
On the basis of the above embodiment, in another embodiment of the present application, as shown in fig. 13, fig. 13 is an external view of the foldable display device, and in this embodiment, the connecting portion further includes a second connecting state;
when the connecting part is in a second connecting state, the first plane and the second plane are attached together;
the first driving circuit and the second driving circuit are used for controlling the portion of the second display region 12 on the first side and the portion of the fourth display region 22 on the second side to display together.
In this embodiment, when the connecting portion is in the second connecting state, the main display areas (the first plane and the second plane) of the first display panel 10 and the second display panel 20 are attached together, which may be regarded as a standby state of the foldable display device, and at this time, the first driving circuit and the second driving circuit control the portion of the second display area 12 on the first side and the portion of the fourth display area 22 on the second side to jointly display some application or notification messages of the functions of the foldable device, such as an incoming call, a missed call, a short message, and an application push.
An alternative embodiment of the present application provides a specific way that when the connection portion is in the second connection state, the first driving circuit and the second driving circuit control the portion of the second display region 12 on the first side and the portion of the fourth display region 22 on the second side to display together, including:
the first driving circuit controls the second display area 12 to display a third sub-image at the first side surface;
the second driving circuit controls the fourth display area 22 to display a fourth sub-image on the second side surface, and the third sub-image and the fourth sub-image form an image to be displayed.
In this embodiment, the first driving circuit does not need to control the fourth display region 22 of the second display panel 20, and the second driving circuit does not need to control the second display region 12 of the first display panel 10, so that data interaction between the first driving circuit and the second driving circuit is reduced, and the reduction of reliability possibly caused by excessive data interaction is reduced.
Correspondingly, the embodiment of the application also provides an electronic device comprising the foldable display device.
Accordingly, an embodiment of the present application further provides a driving method of a foldable display device, as shown in fig. 14, fig. 14 is a schematic flow chart of the driving method of the foldable display device, and is applied to the foldable display device according to any of the embodiments, where the driving method of the foldable display device includes:
s101: when the connecting part is in a first connecting state, the first driving circuit and the second driving circuit control the first display area, the second display area, the third display area and the fourth display area to display together.
When the connecting part is in the first connecting state, the first display panel and the second display panel can realize data interaction through the connecting part, so that the first display area, the second display area, the third display area and the fourth display area can be jointly displayed by the first driving circuit and the second driving circuit, and because the part of the second display area, which is positioned on the first side surface, and the part of the fourth display area, which is positioned on the second side surface, are blocked, in the display process at the moment, the first display area, the part of the second display area, which is positioned on the first plane, the third display area and the part of the fourth display area, which is positioned on the second plane, are mainly displayed, the same picture is jointly displayed, and at the moment, because the part of the second display area, which is positioned on the first plane, and the part of the fourth display area, which is positioned on the second plane, are seamlessly connected, therefore, the purpose of eliminating the non-display area at the splicing part of the two display panels in the foldable display device is realized, and the display effect of the foldable display device when the connecting part is in the first connecting state is improved.
Optionally, as shown in fig. 15, fig. 15 is a schematic flow chart of a driving method of the foldable display device, where the driving method of the foldable display device further includes:
s102: when the connecting part is in a disconnected state, the first driving circuit is used for controlling the first display area and the second display area to display, and the second driving circuit is used for controlling the third display area and the fourth display area to display. When the connecting part is in a disconnected state, the first display panel and the second display panel are separated and can be used as two independent display devices, no data interaction exists between the first driving circuit and the second driving circuit, and the first driving circuit controls the first display area and the second display area to display; and the second driving circuit controls the third display area and the fourth display area to display.
For a more clear description, the following embodiments focus on the display process of each region when the connection part is in the first connection state or the disconnection state.
On the basis of the foregoing embodiment, in another embodiment of the present application, as shown in fig. 16, fig. 16 is a flowchart illustrating a driving method of a foldable display device, and when the connection portion is in the first connection state, the controlling, by the first driving circuit and the second driving circuit, the first display area, the second display area, the third display area, and the fourth display area to jointly display includes:
s1011: the first driving circuit controls a first preset area to display a first sub-image, wherein the first preset area comprises a part of the second display area, which is located on the first plane, and the first display area;
s1012: the second driving circuit controls a second preset area to display a second sub-image, the second preset area comprises a part of the fourth display area, which is located on the second plane, and the third display area, and the first sub-image and the second sub-image form an image to be displayed.
In this embodiment, referring to fig. 6, fig. 6 is a schematic view illustrating a display effect of each display area when the connection portion is in the first connection state; when the first side face and the second side face of the first display panel and the second display panel are attached together through the connecting portion to control the first display area, the second display area, the third display area and the fourth display area to be used for displaying together, an image to be displayed is divided into a first sub-image and a second sub-image, the first driving circuit controls the display area (namely, the first preset area) on one side of the joint of the first display panel and the second display panel to display the first sub-image, and the second driving circuit controls the display area (namely, the second preset area) on the other side of the joint of the first display panel and the second display panel to display the second sub-image, so that complete display of the image to be displayed is completed. And because the first preset area of the first display panel is adjacent to the second preset area of the second display panel, no frame area of any display panel exists in the middle, and a non-display area cannot be formed in the middle of the image to be displayed.
An embodiment of the present application provides a specific process that the first driving circuit and the second driving circuit control the first display region, the second display region, the third display region and the fourth display region to jointly display when the connection portion is in the first connection state, as shown in fig. 17, where fig. 17 is a schematic flow chart of a driving method of a foldable display device, and includes:
s1013: the first driving circuit and the second driving circuit are used for controlling the thin film transistors corresponding to the display pixels in the same row in the first preset area and the second preset area to be turned on in the same time period;
s1014: the first driving circuit is further used for transmitting a data signal containing first sub-image information corresponding to the row of the display pixel corresponding to the opened thin film transistor to the display pixel corresponding to the opened thin film transistor in the first preset area, and transmitting a starting signal to the second driving circuit after the data signal is transmitted;
s1015: and the second driving circuit is further used for transmitting a data signal containing second sub-image information corresponding to the row of the display pixel corresponding to the opened thin film transistor to the display pixel corresponding to the opened thin film transistor in the second preset area after receiving the starting signal, and the first sub-image and the second sub-image form an image to be displayed.
In this embodiment, after the data signal transmission is completed, the first driving circuit further transmits a start signal to the second driving circuit, where the start signal is used to transmit the data signal of the row of the first driving circuit to the surface of the second driving circuit, and at this time, after receiving the start signal, the second driving circuit starts to transmit a data signal containing second sub-image information corresponding to the row of the display pixel corresponding to the turned-on thin film transistor to the display pixel corresponding to the turned-on thin film transistor through the turned-on thin film transistor, so as to achieve the purpose that the first display panel and the second display panel cooperatively display an image to be displayed.
In another embodiment of the present application, as shown in fig. 18, fig. 18 is a flowchart illustrating a driving method of a foldable display device, and when the connection portion is in the first connection state, the controlling, by the first driving circuit and the second driving circuit, the first display region, the second display region, the third display region, and the fourth display region to jointly display includes:
s1016: the first driving circuit and the second driving circuit are used for controlling the thin film transistors corresponding to the display pixels in the same row in the first preset area and the second preset area to be turned on in the same time period;
s1017: the first driving circuit is further configured to send a preloading signal to the second driving circuit, transmit a data signal including first sub-image information corresponding to a row of a display pixel corresponding to the turned-on thin film transistor to the display pixel corresponding to the turned-on thin film transistor in the first preset region, and transmit a start signal to the second driving circuit after the data signal is transmitted;
s1018: the second driving circuit is further configured to preload a data signal including second sub-image information corresponding to a row in which the display pixel corresponding to the turned-on thin film transistor is located after receiving the preload signal, and transmit the data signal including second sub-image information corresponding to the row in which the display pixel corresponding to the turned-on thin film transistor is located to the display pixel corresponding to the turned-on thin film transistor in the second preset region after receiving the start signal, where the first sub-image and the second sub-image constitute an image to be displayed.
In this embodiment, the first driving circuit is further configured to send a preload signal to the second driving circuit, so that when the first driving circuit transmits a data signal including first sub-image information corresponding to a row of a display pixel corresponding to an opened thin film transistor to the display pixel corresponding to the opened thin film transistor in the first preset region, the second driving circuit may preload the data signal including second sub-image information corresponding to the row of the display pixel corresponding to the opened thin film transistor after receiving the preload signal, so that after receiving a start signal sent by the first driving circuit, loading time of the data signals is reduced, thereby reducing overall time for the foldable display device to display an image to be displayed, and improving display smoothness of the foldable display device.
The following describes a display process of each display area when the connection portion is in the disconnected state.
In an alternative embodiment of the present application, as shown in fig. 19, fig. 19 is a flowchart illustrating a driving method of a foldable display device, when the first display panel further includes a first frame region surrounding the first display region and the second display region; the second display panel further comprises a second frame region surrounding the third display region and the fourth display region;
when the connection portion is in an off state, the first driving circuit is configured to control the first display region and the second display region to include:
s1021: the first driving circuit controls the first display area to display an image to be displayed and controls the second display area to display a first preset pattern, and the first preset pattern is the same as the pattern on the surface of the first frame area;
the second driving circuit is used for controlling the third display area and the fourth display area to display, and comprises:
s1022: the second driving circuit controls the third display area to display an image to be displayed and controls the fourth display area to display a second preset pattern, wherein the second preset pattern is the same as the pattern on the surface of the second frame area.
In this embodiment, referring to fig. 11 and 12, fig. 11 is a schematic diagram of a display effect of the first display panel when the connection portion is in a disconnected state, and fig. 12 is a schematic diagram of a display effect of the second display panel when the connection portion is in a disconnected state; when the connecting part is in a disconnected state, the first driving circuit controls the first display area to normally display an image to be displayed and controls the second display area to display a first preset pattern so as to simulate and display the appearance of the first frame area in the second display area, and therefore when the first display panel is used for displaying alone, the pattern displayed on the first surface of the first display panel is symmetrical, and the visual aesthetic requirement of a user is met.
Similarly, when the connecting part is in the disconnected state, the second driving circuit controls the third display area to normally display the image to be displayed, and controls the fourth display area to display a second preset pattern, so that the appearance of the second frame area is simulated and displayed in the fourth display area, and therefore when the second display panel is independently displayed, the pattern displayed on the second surface of the second display panel is symmetrical, and the visual aesthetic requirement of a user is met.
In this embodiment, the scheme that the first driving circuit controls the second display area to display the first preset pattern and the second driving circuit controls the fourth display area to display the second preset pattern may be applied to the case that the patterns of the first frame area and the second frame area are changeable.
When the appearance of the first frame area and the second frame area is the same as the appearance of the display panel in the closed state and the connection portion is in the disconnected state, as shown in fig. 20, fig. 20 is a flowchart of a driving method of the foldable display device, where the first driving circuit is configured to control the first display area and the second display area, and includes:
s1023: the first driving circuit controls the first display area to display an image to be displayed and controls the second display area to be in a closed state;
when the connecting part is in an off state, the second driving circuit is used for controlling the third display area and the fourth display area to display specific information,
s1024: the second driving circuit controls the third display area to display the image to be displayed and controls the fourth display area to be in a closed state.
In this embodiment, the logic that the first driving circuit controls the second display region to be in the closed state and the second driving circuit controls the fourth display region to be in the closed state is suitable for a case where an appearance of the display region is the same as an appearance of the frame region when the display region is in the closed state, and in this case, only one display region of the first display panel and the second display panel operates normally when the first display panel and the second display panel operate independently, which is beneficial to reducing overall power consumption.
On the basis of the above embodiment, in another embodiment of the present application, as shown in fig. 21, fig. 21 is a flowchart illustrating a driving method of a foldable display device, when the connecting portion further includes a second connection state; the driving method of the foldable display device further includes:
s103: when the connecting part is in a second connecting state, the first driving circuit and the second driving circuit are used for controlling the part of the second display area on the first side surface and the part of the fourth display area on the second side surface to display together.
In this embodiment, when the connecting portion is in the second connection state, the main display areas (the first plane and the second plane) of the first display panel and the second display panel are attached together, which may be regarded as a standby state of the foldable display device, and at this time, the first driving circuit and the second driving circuit control the portion of the second display area on the first side and the portion of the fourth display area on the second side to display notification messages of some applications or functions of the foldable device, such as an incoming call, a missed call, a short message, an application push, and the like.
An alternative embodiment of the present application provides a specific manner that when the connection portion is in the second connection state, the first driving circuit and the second driving circuit control the portion of the second display region on the first side surface and the portion of the fourth display region on the second side surface to display together, as shown in fig. 22, where fig. 22 is a schematic flow chart of a driving method of a foldable display device, and includes:
s1031: the first driving circuit controls the second display area to display a third sub-image on the first side face;
s1032: and the second driving circuit controls the fourth display area to display a fourth sub-image on the part of the second side surface, and the third sub-image and the fourth sub-image form an image to be displayed.
In this embodiment, the first driving circuit does not need to control the fourth display area of the second display panel, and the second driving circuit does not need to control the second display area of the first display panel, so that data interaction between the first driving circuit and the second driving circuit is reduced, and therefore, the reduction of reliability possibly caused by excessive data interaction is reduced.
In summary, the present application provides a foldable display device, a driving method thereof, and an electronic apparatus, wherein the foldable display device includes a first display panel, a second display panel, and a connecting portion, and a second display region of the first display panel is connected to the first display region and extends from a first plane to a first side surface; the fourth display area of the second display panel is connected with the third display area and extends from the second plane to the second side surface, so that when the connecting part is in the first connecting state, the part of the second display area, which is positioned on the first side surface, is opposite to the part of the fourth display area, which is positioned on the second side surface, and the part of the second display area, which is positioned on the first plane, is seamlessly connected with the part of the fourth display area, which is positioned on the second plane, thereby achieving the purpose of eliminating the non-display area at the splicing part of the two display panels in the foldable display device and improving the display effect of the foldable display device when the connecting part is in the first connecting state.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. As for the driving method of the foldable display device disclosed in the embodiment, since it corresponds to the foldable display device disclosed in the embodiment, the description is relatively simple, and the relevant points can be referred to the corresponding parts of the foldable display device for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (17)

1. A foldable display device, comprising: the display device comprises a first display panel, a second display panel and a connecting part; wherein,
the first display panel comprises a first plane, a first side face connected with the first plane, a first display area, a second display area and a first driving circuit, wherein the first display area is arranged on the first plane, and the second display area is connected with the first display area and extends to the first side face from the first plane;
the second display panel comprises a second plane, a second side surface connected with the second plane, a third display area, a fourth display area and a second driving circuit, wherein the third display area is arranged on the second plane, and the fourth display area is connected with the third display area and extends to the second side surface from the second plane;
the connecting part comprises a first connecting state;
when the connecting part is in a first connecting state, the first side surface and the second side surface are attached together through the connecting part, the first driving circuit and the second driving circuit are electrically connected through the connecting part, and the first driving circuit and the second driving circuit control the first display area, the second display area, the third display area and the fourth display area to display together;
when the connecting part is in a first connecting state, the first driving circuit and the second driving circuit control the first display area, the second display area, the third display area and the fourth display area to jointly display specific information,
the first driving circuit controls a first preset area to display a first sub-image, wherein the first preset area comprises a part of the second display area, which is located on the first plane, and the first display area;
the second driving circuit controls a second preset area to display a second sub-image, the second preset area comprises a part of the fourth display area, which is located on the second plane, and the third display area, and the first sub-image and the second sub-image form an image to be displayed;
the connection further comprises a disconnected state;
when the connecting part is in a disconnected state, the first display panel and the second display panel are separated, the first driving circuit is used for controlling the display of the first display area and the second display area, and the second driving circuit is used for controlling the display of the third display area and the fourth display area;
the connection portion further comprises a second connection state;
when the connecting part is in a second connecting state, the first plane and the second plane are attached together;
the first driving circuit and the second driving circuit are used for controlling the part of the second display area on the first side face and the part of the fourth display area on the second side face to jointly display.
2. The foldable display device of claim 1, wherein the first and second driving circuits control the first, second, third, and fourth display regions to collectively display, in particular,
the first driving circuit and the second driving circuit are used for controlling the thin film transistors corresponding to the display pixels in the same row in the first preset area and the second preset area to be turned on in the same time period;
the first driving circuit is further used for transmitting a data signal containing first sub-image information corresponding to the row of the display pixel corresponding to the opened thin film transistor to the display pixel corresponding to the opened thin film transistor in the first preset area, and transmitting a starting signal to the second driving circuit after the data signal is transmitted;
and the second driving circuit is further used for transmitting a data signal containing second sub-image information corresponding to the row of the display pixel corresponding to the opened thin film transistor to the display pixel corresponding to the opened thin film transistor in the second preset area after receiving the starting signal, and the first sub-image and the second sub-image form an image to be displayed.
3. The foldable display device of claim 2, wherein the first and second driving circuits control the first, second, third and fourth display regions to collectively display, in particular,
the first driving circuit and the second driving circuit are used for controlling the thin film transistors corresponding to the display pixels in the same row in the first preset area and the second preset area to be turned on in the same time period;
the first driving circuit is further configured to send a preloading signal to the second driving circuit, transmit a data signal including first sub-image information corresponding to a row of a display pixel corresponding to the turned-on thin film transistor to the display pixel corresponding to the turned-on thin film transistor in the first preset region, and transmit a start signal to the second driving circuit after the data signal is transmitted;
the second driving circuit is further configured to preload a data signal including second sub-image information corresponding to a row in which the display pixel corresponding to the turned-on thin film transistor is located after receiving the preload signal, and transmit the data signal including second sub-image information corresponding to the row in which the display pixel corresponding to the turned-on thin film transistor is located to the display pixel corresponding to the turned-on thin film transistor in the second preset region after receiving the start signal, where the first sub-image and the second sub-image constitute an image to be displayed.
4. The foldable display device of claim 1, wherein the first display panel further comprises a first bezel area surrounding the first display area and the second display area;
the second display panel further includes a second bezel region surrounding the third display region and the fourth display region;
the first driving circuit is arranged in the first frame area;
the second driving circuit is arranged in the second frame area.
5. The foldable display device of claim 4, wherein the first driving circuit is configured to control the first display region and the second display region to display, in particular,
the first driving circuit controls the first display area to display an image to be displayed and controls the second display area to display a first preset pattern, wherein the first preset pattern is the same as the pattern on the surface of the first frame area.
6. The foldable display device of claim 4, wherein the second driving circuit is configured to control the third display region and the fourth display region to display, in particular,
the second driving circuit controls the third display area to display an image to be displayed and controls the fourth display area to display a second preset pattern, wherein the second preset pattern is the same as the pattern on the surface of the second frame area.
7. The foldable display device of claim 1, wherein the first driving circuit is configured to control the first display region and the second display region to display, in particular,
the first driving circuit controls the first display area to display an image to be displayed and controls the second display area to be in a closed state;
when the connecting part is in an off state, the second driving circuit is used for controlling the third display area and the fourth display area to display specific information,
the second driving circuit controls the third display area to display the image to be displayed and controls the fourth display area to be in a closed state.
8. The foldable display device of claim 1, wherein the first and second driving circuits are configured to control a portion of the second display area at a first side and a portion of the fourth display area at a second side to display together when the connecting portion is in a second connecting state,
the first driving circuit controls the second display area to display a third sub-image on the first side face;
and the second driving circuit controls the fourth display area to display a fourth sub-image on the part of the second side surface, and the third sub-image and the fourth sub-image form an image to be displayed.
9. The foldable display device of claim 1, wherein the first display panel and the second display panel are both OLED display panels.
10. The foldable display device of claim 1, wherein the first driving circuit comprises a first gate driving circuit, a second gate driving circuit, and a first data driving circuit;
the second driving circuit comprises a third gate driving circuit, a fourth gate driving circuit and a second data driving circuit;
the display area comprises a plurality of gate lines and data lines which are arranged in a crossed mode, and a plurality of display pixels located at the crossed points of the gate lines and the data lines;
the gate lines of the first display area and the second display area are respectively and electrically connected with the first gate driving circuit and the second gate driving circuit, and the data lines of the first display area and the second display area are electrically connected with the first data driving circuit;
the gate lines of the third display area and the fourth display area are respectively and electrically connected with the third gate driving circuit and the fourth gate driving circuit, and the data lines of the third display area and the fourth display area are electrically connected with the second data driving circuit.
11. An electronic device, comprising: the foldable display device of any one of claims 1 to 10.
12. A method of driving a foldable display device, applied to the foldable display device according to any one of claims 1 to 10, the method comprising:
when the connecting part is in a first connecting state, the first driving circuit and the second driving circuit control the first display area, the second display area, the third display area and the fourth display area to display together;
when the connecting part is in a first connecting state, the first driving circuit and the second driving circuit control the first display area, the second display area, the third display area and the fourth display area to jointly display, and the method comprises the following steps:
the first driving circuit controls a first preset area to display a first sub-image, wherein the first preset area comprises a part of the second display area, which is located on the first plane, and the first display area;
the second driving circuit controls a second preset area to display a second sub-image, the second preset area comprises a part of the fourth display area, which is located on the second plane, and the third display area, and the first sub-image and the second sub-image form an image to be displayed;
when the connecting portion still includes disconnected state, still include:
when the connecting part is in an off state, the first driving circuit is used for controlling the display of the first display area and the second display area, and the second driving circuit is used for controlling the display of the third display area and the fourth display area;
when the connection portion further comprises a second connection state; the driving method of the foldable display device further includes:
when the connecting part is in a second connecting state, the first driving circuit and the second driving circuit are used for controlling the part of the second display area on the first side surface and the part of the fourth display area on the second side surface to display together.
13. The method according to claim 12, wherein the controlling the first display region, the second display region, the third display region, and the fourth display region to display together by the first driving circuit and the second driving circuit when the connecting portion is in the first connection state comprises:
the first driving circuit and the second driving circuit are used for controlling the thin film transistors corresponding to the display pixels in the same row in the first preset area and the second preset area to be turned on in the same time period;
the first driving circuit is further used for transmitting a data signal containing first sub-image information corresponding to the row of the display pixel corresponding to the opened thin film transistor to the display pixel corresponding to the opened thin film transistor in the first preset area, and transmitting a starting signal to the second driving circuit after the data signal is transmitted;
and the second driving circuit is further used for transmitting a data signal containing second sub-image information corresponding to the row of the display pixel corresponding to the opened thin film transistor to the display pixel corresponding to the opened thin film transistor in the second preset area after receiving the starting signal, and the first sub-image and the second sub-image form an image to be displayed.
14. The method according to claim 12, wherein the controlling the first display region, the second display region, the third display region, and the fourth display region to display together by the first driving circuit and the second driving circuit when the connecting portion is in the first connection state comprises:
the first driving circuit and the second driving circuit are used for controlling the thin film transistors corresponding to the display pixels in the same row in the first preset area and the second preset area to be turned on in the same time period;
the first driving circuit is further configured to send a preloading signal to the second driving circuit, transmit a data signal including first sub-image information corresponding to a row of a display pixel corresponding to the turned-on thin film transistor to the display pixel corresponding to the turned-on thin film transistor in the first preset region, and transmit a start signal to the second driving circuit after the data signal is transmitted;
the second driving circuit is further configured to preload a data signal including second sub-image information corresponding to a row in which the display pixel corresponding to the turned-on thin film transistor is located after receiving the preload signal, and transmit the data signal including second sub-image information corresponding to the row in which the display pixel corresponding to the turned-on thin film transistor is located to the display pixel corresponding to the turned-on thin film transistor in the second preset region after receiving the start signal, where the first sub-image and the second sub-image constitute an image to be displayed.
15. The method for driving a foldable display device according to claim 12, wherein when the first display panel further comprises a first bezel region surrounding the first display region and the second display region; the second display panel further comprises a second frame region surrounding the third display region and the fourth display region;
when the connection portion is in an off state, the first driving circuit is configured to control the first display region and the second display region to include:
the first driving circuit controls the first display area to display an image to be displayed and controls the second display area to display a first preset pattern, and the first preset pattern is the same as the pattern on the surface of the first frame area;
the second driving circuit is used for controlling the third display area and the fourth display area to display, and comprises:
the second driving circuit controls the third display area to display an image to be displayed and controls the fourth display area to display a second preset pattern, wherein the second preset pattern is the same as the pattern on the surface of the second frame area.
16. The method for driving a foldable display device according to claim 12, wherein when the first display panel further comprises a first bezel region surrounding the first display region and the second display region; the second display panel further comprises a second frame region surrounding the third display region and the fourth display region;
when the connection portion is in an off state, the first driving circuit is configured to control the first display region and the second display region to include:
the first driving circuit controls the first display area to display an image to be displayed and controls the second display area to be in a closed state;
when the connecting part is in an off state, the second driving circuit is used for controlling the third display area and the fourth display area to display specific information,
the second driving circuit controls the third display area to display the image to be displayed and controls the fourth display area to be in a closed state.
17. The method according to claim 12, wherein the first and second driving circuits are configured to control the portion of the second display region at the first side and the portion of the fourth display region at the second side to display together when the connecting portion is in the second connecting state comprises:
the first driving circuit controls the second display area to display a third sub-image on the first side face;
and the second driving circuit controls the fourth display area to display a fourth sub-image on the part of the second side surface, and the third sub-image and the fourth sub-image form an image to be displayed.
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