WO2022089036A1 - 盖板及可折叠显示装置 - Google Patents

盖板及可折叠显示装置 Download PDF

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Publication number
WO2022089036A1
WO2022089036A1 PCT/CN2021/117599 CN2021117599W WO2022089036A1 WO 2022089036 A1 WO2022089036 A1 WO 2022089036A1 CN 2021117599 W CN2021117599 W CN 2021117599W WO 2022089036 A1 WO2022089036 A1 WO 2022089036A1
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WO
WIPO (PCT)
Prior art keywords
edge
area
display
cover plate
plane
Prior art date
Application number
PCT/CN2021/117599
Other languages
English (en)
French (fr)
Inventor
崔志宏
冯彬峰
Original Assignee
京东方科技集团股份有限公司
成都京东方光电科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司, 成都京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to GB2218008.7A priority Critical patent/GB2610740A/en
Priority to US17/801,898 priority patent/US11763702B2/en
Publication of WO2022089036A1 publication Critical patent/WO2022089036A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1652—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being flexible, e.g. mimicking a sheet of paper, or rollable
    • 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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1626—Constructional details or arrangements for portable computers with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1641—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being formed by a plurality of foldable display components
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/20—Cooling means
    • G06F1/203—Cooling means for portable computers, e.g. for laptops
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2200/00—Indexing scheme relating to G06F1/04 - G06F1/32
    • G06F2200/16—Indexing scheme relating to G06F1/16 - G06F1/18
    • G06F2200/163—Indexing scheme relating to constructional details of the computer
    • G06F2200/1633—Protecting arrangement for the entire housing of the computer

Definitions

  • the present disclosure relates to the field of display technology, and in particular, to a cover plate and a foldable display device.
  • foldable display products for example: folding mobile phones
  • a secondary display screen is usually equipped on the back of the folding display product as one of the usage scenarios; the size of the secondary display screen is usually the main display.
  • Half the size of the screen, installed on the whole machine, has three sides adjacent to the border of the folding display product, and the other side is located in the middle of the folding display product.
  • adding a secondary display screen to the back of the folding display product can make the folding display product have various usage scenarios, but it will reduce the reliability of the folding display product, for example, the secondary display screen is prone to damage during the drop test.
  • the purpose of the present disclosure is to provide a cover plate and a foldable display device to improve product reliability.
  • a first aspect of the present disclosure provides a cover plate for a foldable display device, the foldable display device has a first area, a second area, and a foldable connection between the first area and the second area a folding area, wherein the foldable display device includes a first display panel located in the first area, and the cover can be located in the first area and disposed on a display side of the first display panel;
  • the surface of the cover plate away from the first display panel is the first surface;
  • the first surface includes a center plane and an edge plane, a first edge arc surface, and a second edge that surround the center plane and are connected end to end in sequence
  • the edge plane and the second edge arc surface are oppositely arranged in the first direction, and the first edge arc surface and the third edge arc surface are opposite in the second direction setting, the second direction and the first direction are perpendicular to each other;
  • the edge plane is located on the side of the second edge arc surface close to the foldable area; and the curvatures of the first edge arc surface and the third edge arc surface are from the second edge arc surface gradually decreases to the edge plane.
  • the curvature of the first edge arc surface at the junction with the edge plane is 0;
  • the curvature of the third edge arc surface at the point where it meets the edge plane is zero.
  • the width of the first edge cambered surface and the edge plane is W1
  • the width of the first edge cambered surface and the second edge cambered surface is W2
  • the W2 and the The ratio of W1 is 0.5 to 0.8;
  • the width of the third edge cambered surface that meets the edge plane is W3, the width of the third edge cambered surface that connects with the second edge cambered surface is W4, and the W4 and the The ratio of W3 is 0.5 to 0.8;
  • the width is the dimension in the second direction.
  • the curvature of the second edge arc surface is the same everywhere in the second direction.
  • a surface of the cover plate close to the first display panel is a second surface, wherein the second surface is a plane.
  • the surface of the cover plate close to the first display panel is the second surface, wherein,
  • the area opposite to the central plane and the area opposite to the edge plane are both planes;
  • the area opposite to the first edge arc surface, the area opposite to the second edge arc surface, and the area opposite to the third edge arc surface are all arc surfaces.
  • the curvature of a region of the second surface opposite to the first edge camber is the same as the curvature of the first edge camber;
  • the curvature of the area opposite to the second edge arc in the second surface is the same as the curvature of the second edge arc;
  • the curvature of a region of the second surface opposite to the third edge camber is the same as the curvature of the third edge camber.
  • a second aspect of the present disclosure provides a foldable display device, the foldable display device has a first area, a second area, and a foldable area connecting the first area and the second area, wherein,
  • the foldable display device includes a first display panel and a first cover plate located in the first area, the first cover plate is arranged on the display side of the first display panel, and the first cover plate is the above-mentioned any one of the cover plates.
  • the first display panel has a display area and a non-display area arranged around the display area, the display area has a first border and a second border opposite in the second direction, the first border and all the the second boundaries both extend in the first direction;
  • the boundary of the first edge arc surface that is in contact with the central plane is a third boundary, the third boundary intersects with the first boundary, and the intersection point is the first intersection point;
  • the boundary of the third edge arc surface that is in contact with the central plane is a fourth boundary, the fourth boundary intersects with the second boundary, and the intersection point is the second intersection point;
  • the ratio of the length of the line segment located at the first intersection point close to the second edge arc surface in the first boundary to the length of the line segment located at the first intersection point close to the edge plane in the first boundary is 0.2 to 0.5 ;
  • the ratio of the length of the line segment located at the second intersection point close to the second edge arc surface in the second boundary to the length of the line segment located at the second intersection point close to the edge plane in the second boundary is 0.2 to 0.5 .
  • the first display panel is flexible; and the first display panel includes a display part, a binding part on the back side of the display part, and a bending part connecting the display part and the binding part; the The first cover plate is provided on the display side of the display part, and the display part includes the display area and the non-display area;
  • a part of the orthographic projection of the binding portion on the reference plane is located in the orthographic projection of the third edge arc surface on the reference plane, and the other part is located in the orthographic projection of the central plane on the reference plane , the reference plane is a plane parallel to the central plane.
  • the foldable display device further includes a second display panel and a second cover at the first area, the second area and the foldable area;
  • the second display panel and the second cover plate are flexible, the side of the second display panel away from the first display panel is the display side, and the second cover plate is located on the second display panel.
  • the display side of the display panel, and the outer contour of the second cover plate exceeds the outer contour of the second display panel.
  • FIG. 1 shows a schematic structural diagram of a foldable display device according to an embodiment of the present disclosure in a folded state
  • FIG. 2 shows a schematic structural diagram of the foldable display device according to an embodiment of the present disclosure in an unfolded state
  • FIG. 3 shows a schematic structural diagram of the foldable display device according to another embodiment of the present disclosure in an unfolded state
  • FIG. 4 shows a schematic cross-sectional view of the foldable display device according to an embodiment of FIG. 2 along the P-P line;
  • FIG. 5 shows a schematic cross-sectional view of the foldable display device according to an embodiment of FIG. 2 along the N-N line;
  • FIG. 6 shows a schematic cross-sectional view of the foldable display device according to another embodiment of FIG. 2 along the N-N line;
  • FIG. 7 shows a schematic cross-sectional view of the foldable display device according to another embodiment of FIG. 2 along the N-N line;
  • FIG. 8 shows a schematic cross-sectional view of the foldable display device according to still another embodiment of FIG. 2 along the M-M line;
  • FIG. 9 shows a schematic structural diagram of the foldable display device according to another embodiment of the present disclosure in an unfolded state
  • FIG. 10 shows a schematic side view of the first cover plate of the foldable display device according to an embodiment of FIG. 9;
  • Fig. 11 shows a schematic side view of the first cover plate of the foldable display device according to another embodiment of Fig. 9;
  • FIG. 12 shows a schematic plan view of the first cover plate of the foldable display device according to an embodiment in FIG. 9 from an external viewing angle;
  • Fig. 13a shows a schematic cross-sectional view of the first cover plate according to an embodiment in Fig. 12 along the line Q-Q;
  • Fig. 13b shows a schematic cross-sectional view of the first cover plate along the R-R line according to an embodiment of Fig. 12;
  • Fig. 13c shows a schematic cross-sectional view of the first cover plate according to an embodiment in Fig. 12 along the T-T line;
  • Fig. 13d shows a schematic cross-sectional view of the first cover plate according to an embodiment of Fig. 12 along the H-H line;
  • Fig. 14a shows a schematic cross-sectional view of the first cover plate according to another embodiment in Fig. 12 along the R-R line;
  • Fig. 14b shows a schematic cross-sectional view of the first cover plate according to another embodiment in Fig. 12 along the T-T line;
  • Fig. 14c shows a schematic cross-sectional view of the first cover plate according to another embodiment in Fig. 12 along the line H-H;
  • FIG. 15 shows a schematic plan view of the first cover plate of the foldable display device according to an embodiment of FIG. 9 from an external viewing angle.
  • on described in this text can mean that one layer is directly formed or disposed on another layer, or it can mean that one layer is indirectly formed or disposed on another layer, that is, between two layers Other layers also exist.
  • connection should be construed in a broad sense.
  • it may be a fixed connection, or a detachable connection, or an integral connection; it may be a mechanical connection, or an electrical connection; it may be a direct connection, or an indirect connection through an intermediate piece, or an internal communication between two elements.
  • connection may be a fixed connection, or a detachable connection, or an integral connection; it may be a mechanical connection, or an electrical connection; it may be a direct connection, or an indirect connection through an intermediate piece, or an internal communication between two elements.
  • An embodiment of the present disclosure provides a foldable display device, the foldable display device has a first area S1, a second area S2, and a foldable area S3 connecting the first area S1 and the second area S2; as shown in FIG. 1
  • the foldable display device can have a folded state.
  • the foldable area S3 can be in a folded state as a whole, and the first area S1 and the second area S2 are in the foldable display device.
  • the foldable display device Arranged in the thickness direction Z; as shown in FIG. 2 and FIG. 3 , the foldable display device can also have an unfolded state.
  • the foldable area S3 can be in a flat state as a whole, while the first area The S1 and the second area S2 are arranged in the first direction X, and the first direction X is perpendicular to the thickness direction Z of the foldable display device.
  • the foldable area S3 of the embodiment of the present disclosure can be completely exposed relative to the first area S1 and the second area S2 when the foldable display device is in a folded state.
  • the foldable area S3 of the embodiment of the present disclosure can be completely exposed relative to the first area S1 and the second area S2 when the foldable display device is in the unfolded state, as shown in FIG. 2 ; but not limited to this, the embodiment of the present disclosure may
  • the folding area S3 can also be at least partially hidden in the first area S1 and the second area S2 when the foldable display device is in the unfolded state, as shown in FIG. 3 .
  • the entire first area S1 and the entire second area S2 are basically not bent.
  • the foldable display device may include a first display panel 10 and a first cover plate 29 located in the first area S1, and the first cover plate 29 is disposed on the display side of the first display panel 10; the first cover plate 29 and the first cover plate 29
  • the display panel 10 as a whole can constitute a display screen of the foldable display device.
  • the first cover plate 29 may be less flexible (that is, not easily deformed).
  • the glass cover plate but not limited to this, can also be a cover plate made of high molecular polymer with good flexibility (ie, easy to deform).
  • the first display panel 10 can be a rigid panel that is not easily deformed, or a flexible panel that is easily deformed.
  • the first display panel 10 in the embodiment of the present disclosure may be a flexible panel, that is, the first display panel may have flexibility.
  • the first display panel 10 may include a display portion 10a, The binding part 10b on the back side of the display part 10a and the bending part 10c connecting the display part 10a and the binding part 10b, the display part 10a can be displayed by OLED (Organic Light Emitting Diode), but not limited to this; it should be understood that Yes, the aforementioned first cover plate 29 needs to be arranged on the display side of the display portion 10a, that is, the first cover plate 29 is arranged on the side of the display portion 10a away from the binding portion 10b; wherein, the first cover plate 29 can be It is adhered to one side of the display part 10 a through the adhesive layer 34 .
  • the structure of the first display panel 10 of the embodiment of the present disclosure is not limited to the aforementioned bending structure, and may also be a planar
  • a first heat dissipation film layer 36 may be disposed on the back side of the display portion 10a; the orthographic projection of the first heat dissipation film layer 36 on the display portion 10a is located in the display portion 10a or overlaps with it
  • the first heat dissipation film layer 36 may be a multi-layer structure, and the first heat dissipation film layer 36 may include an EMBO (embossed silicone buffer material) layer, a Foam (foam material) layer, and a PI (polyamide) layer arranged in sequence.
  • the first heat dissipation film layer 36 can also be composed of other film layers, as long as it can ensure that the first heat dissipation film layer 36 has good Heat dissipation performance and bendability are sufficient.
  • the first heat dissipation film layer 36 can also be a single-layer structure, depending on the specific situation.
  • a booster film layer 37 may also be provided, and by arranging the booster film layer 37, the curvature of the first display panel 10 and the curvature of the first display panel 10 can be ensured. Bending stability.
  • the outer side of the bending portion 10c may be covered with a strain neutral adhesive layer 38, and the strain neutral adhesive layer 38 may also cover the edge portions of the display portion 10a and the binding portion 10b;
  • the neutral adhesive layer 38 can protect the bent portion 10c from being broken during the bending process; for example, the strain-neutral adhesive layer 38 can be an organic adhesive material.
  • the foldable display device may further include a first flexible circuit board 11 and a rigid film 12, wherein:
  • the first flexible circuit board 11 may be disposed on the side of the first heat dissipation film layer 36 away from the display portion 10a; as shown in FIG. 5, the first flexible circuit board 11 may include a first portion 110, a second portion 111 and a connecting The curved portion 112 of the first portion 110 and the second portion 111, specifically, the orthographic projection of the curved portion 112 on the display portion 10a may be located in the display area of the display portion 10a; the first portion 110 may be electrically connected to the binding portion 10b; The second part 111 may be located on the side of the first part 110 away from the display part 10a. It should be understood that, as shown in FIG. It can be electrically connected to the first main circuit board 13 . It should be noted that the first main circuit board 13 can be located on the side of the second part 111 away from the first part 110 .
  • a rigid film 12 may be disposed between the side of the first heat dissipation film layer 36 away from the display portion 10 a and the curved portion 112 ; the orthographic projection of the rigid film 12 on the display portion 10 a may be is located in the orthographic projection of the first heat dissipation film layer 36 on the display portion 10a; and the rigid film 12 can support the curved portion 112 of the first flexible circuit board 11, it should be understood that the rigidity of the rigid film 12 can be greater than that of the first The rigidity of the heat dissipation film layer 36 and the display portion 10 a , that is, the rigid film 12 is less likely to be deformed by force than the display portion 10 a and the first heat dissipation film layer 36 .
  • the material of the rigid diaphragm 12 can be polyimide (PI) or stainless steel (SUS). It should be understood that the PI material used for making the rigid diaphragm 12 should be a hard PI material
  • the thickness of the rigid diaphragm 12 may be 0.1 mm to 0.5 mm, such as: 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc., by designing the thickness of the rigid diaphragm 12 to be greater than or equal to 0.1 mm , to ensure that the rigid film 12 has sufficient rigidity, and the thickness of the rigid film 12 is designed to be less than or equal to 0.5 mm, which can reduce the overall thickness of the product.
  • the rigid diaphragm 12 is disposed between the curved portion 112 of the first flexible circuit board 11 and the back side of the display portion 10a, and the rigid diaphragm 12 is not easily deformed by force, so during the installation process Among them, the rigid film 12 can disperse and release the resilient force generated by the curved portion 112 , thus avoiding the obvious stamping of the position corresponding to the curved portion 112 in the display area of the display portion 10a , thereby improving the display effect.
  • the bending portion 112 of the first flexible circuit board 11 in the embodiment of the present disclosure is not limited to be provided in the display area of the display portion 10a, but may also be provided in a non-display area.
  • the installation process may be as follows: first, the second part 111 of the first flexible circuit board 11 is electrically connected to the first main circuit board 13 , and then the first flexible circuit board 11 is bent to The aforementioned bent portion 112 is formed so that the first portion 110 is located on the side of the second portion 111 away from the first main circuit board 13 .
  • the first portion 110 may be electrically connected to the binding portion 10b before the second portion 111 is electrically connected to the first main circuit board 13, or the first portion 110 may be bent to the second portion 111 away from the first portion 110.
  • One side of a main circuit board 13 is then electrically connected to the binding portion 10b.
  • the first main circuit board 13 may be provided with a first connection terminal 14
  • the second portion 111 of the first flexible circuit board 11 may be provided with a fitting capable of being snapped or inserted with the first connection terminal 14
  • the terminals 15 namely, the mating terminals 15 and the first connection terminals 14 are buckled or inserted to realize the electrical connection between the first main circuit board 13 and the second part 111 .
  • the bending axis corresponding to the bending part 112 of the first flexible circuit board 11 may extend in the second direction Y (as shown in FIG. 2 to FIG. 4 ), and the bending part 112 is on the display part 10a
  • the orthographic projection of has a first boundary A and a second boundary B opposite in the first direction X.
  • the second boundary B is the side of the curved portion 112 that is close to the first portion 110 and the second portion 111
  • the first boundary A is the side of the curved portion 112 away from the first portion 110 and the second portion 111, as shown in FIG. 5 and FIG.
  • the orthographic projection of the rigid diaphragm 12 on the display portion 10a has a The opposite third boundary C and fourth boundary D in the direction X, as shown in FIG. 5 and FIG. 6 , the third boundary C is located on the side of the first boundary A away from the second boundary B, and the fourth boundary D is located on the second boundary Boundary B is on the side away from the first boundary A.
  • the rigid diaphragm 12 can be better aligned with the curved portion.
  • the rebound force generated by 112 is dispersed. Specifically, compared with the solution in which the first boundary A and the second boundary B of the bending portion 112 are located outside the third boundary C and the fourth boundary D of the rigid diaphragm 12, bending can be avoided.
  • the resilient force generated by the portion 112 is concentrated on the third boundary C and the fourth boundary D of the rigid diaphragm 12, so that it is possible to avoid the occurrence of mold at the positions corresponding to the third boundary C and the fourth boundary D of the rigid diaphragm 12 in the display portion 10a. printing to avoid improving the display.
  • first direction X mentioned in the embodiments of the present disclosure is perpendicular to the second direction Y; and both the first direction X and the second direction Y are perpendicular to the thickness direction Z of the foldable display device.
  • the distance between the third boundary C of the rigid diaphragm 12 and the first boundary A of the curved portion 112 in the first direction X may be equal to the distance between the fourth boundary D of the rigid diaphragm 12 and the second boundary B of the curved portion 112
  • the distance in the first direction X can ensure the uniformity of the overall force of the rigid diaphragm 12, so as to better disperse the stress; but not limited to this, the third boundary C of the rigid diaphragm 12 and the curved portion
  • the distance between the first boundary A of the 112 in the first direction X and the distance between the fourth boundary D of the rigid diaphragm 12 and the second boundary B of the curved portion 112 in the first direction X may also be unequal.
  • the distance between the third boundary C of the rigid membrane 12 and the first boundary A of the curved portion 112 in the first direction X may be greater than or equal to 1 cm; the fourth boundary D of the rigid membrane 12 and the bending
  • the distance between the second boundary B of the portion 112 in the first direction X is greater than or equal to 1 cm, so that the rigid diaphragm 12 can better disperse the stress.
  • the area of the rigid diaphragm 12 in the embodiment of the present disclosure can be determined according to the actual situation, as long as it can better disperse the stress and avoid the printing on the machine.
  • a buffer portion 16 may be disposed in the bending space of the curved portion 112 , and the orthographic projection of the buffer portion 16 on the display portion 10 a is located on the display portion of the rigid diaphragm 12 .
  • the buffer part 16 can be arranged at a position where the curved part 112 is close to the first part 110, and the orthographic projection of the buffer part 16 on the display part 10a is located on the rigid diaphragm 12 on the display part 10a the central area of the orthographic projection.
  • the design enables the buffer portion 16 to provide a certain buffer force for the curved portion 112, so as to ensure that the curved portion 112 has a good ability to restore deformation and avoid A situation in which the bent portion 112 forms a dead break during the installation process.
  • the foldable display device in the embodiment of the present disclosure may further include a middle frame structure, where the middle frame structure includes a first middle frame located in the first area S1.
  • the first middle frame The frame may include a first mounting plate 17 and a first side plate 18, the first mounting plate 17 has an opposite first mounting surface 170 and a second mounting surface 171, and the first side plate 18 is disposed on the first mounting surface 170.
  • the first side plate 18 can be arranged around the four sides of the first installation surface 170, but Not limited to this, it can also be arranged on three sides, or arranged on opposite sides, etc., depending on the specific situation.
  • the aforementioned first display panel 10 , first flexible circuit board 11 , rigid film 12 , first main circuit board 13 , first connecting terminal 14 , mating terminal 15 , and buffer portion 16 can be located in the first mounting groove 19, specifically, the first part 110 is located on the side of the second part 111 away from the first installation surface 170; it should be noted that, as shown in FIG.
  • the first mounting surface 170 is provided with a first mounting groove 170b; the aforementioned first main circuit board 13 may be specifically located in the first mounting groove 170b, and the part of the first connecting terminal 14 protrudes from the first mounting groove 170b.
  • a fitting groove 170b is inserted or snapped with the mating terminal 15 on the second part 111 .
  • the edge of the first cover plate 29 extends beyond the edge of the display portion 10a, and the portion of the first cover plate 29 beyond the display portion 10a can ride on the end surface of the first side plate 18 away from the first installation surface 170; specifically , the end surface of the first side plate 18 away from the first installation surface 170 may be provided with a positioning groove, and the protruding portion of the first cover plate 29 may be mounted on the positioning groove of the first side plate 18 , as shown in FIG. 7 .
  • the middle frame structure in the embodiment of the present disclosure may be a folding mechanism, and in addition to the aforementioned first middle frame located in the first area S1, it may also include a rotatable connection with the first middle frame and located in the second middle frame.
  • the second middle frame of the area S2 is rotatably connected to the first middle frame through a hinge mechanism 20 , and the hinge mechanism 20 can be located in the foldable area S3 .
  • the second middle frame may include at least a second mounting plate 21, and the second mounting plate 21 has a third mounting surface 210 and a fourth mounting surface 211 opposite to each other, wherein the first middle frame and the second The relative rotation of the middle frame can make the third installation surface 210 rotate to a position facing the second installation surface 171 .
  • the foldable display device of the embodiment of the present disclosure may further include a second display panel 22 located in the first area S1 , the second area S2 and the foldable area S3 , the second display panel 22 It can be located on the side of the second installation surface 171 away from the first installation surface 170 and at the side of the third installation surface 210 away from the fourth installation surface 211.
  • the second display panel 22 faces the second installation surface 171 and One side of the third mounting surface 210 is the back side of the second display panel 22 , and the side of the second display panel 22 away from the second mounting surface 171 and the third mounting surface 210 is the display side; for example, as shown in FIG.
  • the second display panel 22 may include a display substrate 220 and a second heat dissipation film layer 221, and the second heat dissipation film layer 221 may be disposed on the back side of the display substrate 220; The projection is within or coincident with the display substrate 220 .
  • the structure of the second heat dissipation film layer 221 and the aforementioned first heat dissipation film layer 36 may be the same, and details are not repeated here.
  • the second display panel 22 may be a flexible display panel, that is, the second display panel 22 is flexible, and the first middle frame and the second middle frame are rotated relative to each other so that the third mounting surface 210 is rotated to face the second mounting surface 171 At the same time, the second display panel 22 can be bent, that is, the entire foldable display device can be bent inward, that is, the display surface of the display substrate 220 is located inside the bending.
  • the foldable display device may further include a second main circuit board 23 and a second flexible circuit board 24 ; wherein, the second main circuit board 23 may be disposed on the first mounting board 17 or the second mounting board 21, the second main circuit board 23 is provided with a second connection terminal; one end of the second flexible circuit board 24 is electrically connected to the second connection terminal 25, and the other end is electrically connected to the second display panel 22 . It should be noted that one end of the second flexible circuit board 24 can be bound to the second display panel 22 on the display side of the second display panel 22; The position on the display side is bent to form a binding portion, and then electrically connected to the second flexible circuit board 24 .
  • the aforementioned first mounting surface 170 may further be provided with a second mounting groove 170 c
  • the first mounting plate 17 is further provided with a penetration through the first mounting surface 170 and the second mounting surface 171 through hole (not shown in the figure), this through hole communicates with the second assembly groove 170c; while the second main circuit board 23 and the second connection terminal 25 are located in the second assembly groove 170c, and the second flexible circuit board One end of 24 is electrically connected to the second connection terminal 25 through the through hole.
  • the second main circuit board 23 and the first main circuit board 13 can be integrated in a single structure or can be provided independently of each other. It should be understood that the second main circuit board 23 and the first main circuit board 13 are integrated In structure, the first fitting groove 170b and the second fitting groove 170c can communicate with each other.
  • the second side plate 26 may be provided around the second mounting surface 171 of the first mounting plate 17 . It should be understood that the second mounting surface 171 is connected to the third mounting surface 171 .
  • the adjacent side of the surface 210 may not be provided with the second side plate 26, and the other three sides may be provided, but not limited to this;
  • the third side plate 27 may be provided around the third mounting surface 210 of the second mounting plate 21, it should be understood Yes, the side of the third mounting surface 210 adjacent to the second mounting surface 171 may not be provided with the third side plate 27, and the other three sides may be provided, but not limited to this; wherein, the second side plate 26, the second mounting surface
  • the surface 171 , the third mounting surface 210 and the third side plate 27 may enclose the second mounting slot 28 , and the aforementioned second display panel 22 and the second flexible circuit board 24 may be located in the second mounting slot 28 .
  • the foldable display device of the embodiment of the present disclosure may further include a second cover plate 30 located in the first area S1 , the second area S2 and the foldable area S3 , and the second cover plate 30 is located on the second display panel 22 on the display side, that is, the second cover plate 30 may be disposed on the side of the second display panel 22 away from the second mounting surface 171 and the third mounting surface 210 , and the second cover plate 30 and the second display panel 22 may constitute a Another display of a foldable display device.
  • the edge of the second cover plate 30 may also exceed the edge of the second display panel 22 ; the outer contour of the second cover plate 30 may exceed the outer contour of the second display panel 22 .
  • the second cover plate 30 can be a flexible cover plate, for example, it can be made of high molecular polymer material, that is to say, the second cover plate 30 can be bent.
  • the second cover plate 30 can be bent together with the second display panel 22 .
  • the fourth side plate 33 can also be arranged around the fourth installation surface 211 . It should be noted that when the fourth installation surface 211 is rectangular, the fourth side plate 33 can be arranged around the fourth side plate 33 .
  • the four sides of the installation surface 211 can also be arranged on three sides, or arranged on two opposite sides, etc., depending on the specific situation.
  • the second middle frame may further include a third mounting plate 31 opposite to the second mounting plate 21 , and the fourth side plate 33 may be surrounded by the third mounting plate 31 and the fourth mounting surface 211 of the second mounting plate 21 .
  • the third installation slot 32, and the display device may further include a battery (not shown in the figure) and other structures, the battery can be placed in the third installation slot 32, but not limited to this, the third installation slot 32 can also be provided other structures.
  • the second middle frame in the embodiment of the present disclosure may also not include the third mounting plate 31, depending on the specific situation.
  • first middle frame in the embodiment of the present disclosure may have an integrated structure, and the entire second middle frame may also be an integrated structure.
  • the aforementioned first display panel 10 and the first cover plate 29 constitute a display screen which may be the secondary display screen of the entire foldable display device, and the aforementioned second display panel 22 A display screen formed with the second cover 30 can be the main display screen of the entire foldable display device.
  • the main display screen can be mainly used for display, but it is not limited to this.
  • the side where the secondary display screen is located may be the rear view side of the entire foldable display device, and the side where the main display screen is located may be the front view side of the entire foldable display device.
  • the main display screen and the sub-display screen of the embodiment of the present disclosure may be designed in a rectangular shape as a whole.
  • the specific type of the foldable display device is not particularly limited, and any type of display device commonly used in the art can be used, such as a mobile phone, a tablet computer, etc.
  • the specific application should be selected accordingly, which will not be repeated here.
  • the foldable display device also includes other necessary components and components, taking a mobile phone as an example, such as a front case, a back case, a touch function layer, a polarizer, a power cord And so on, those skilled in the art can make corresponding supplements according to the specific usage requirements of the display device, which will not be repeated here.
  • the main display screen of the embodiment of the present disclosure is located in the entire area of the foldable display device, and the four sides of the main display screen are close to the edge of the entire foldable display device. Therefore, in order to improve the performance of the main display screen during the drop test process For reliability, the edges of the second cover 30 at the four sides can be set in an arc shape; specifically, as shown in FIG.
  • the surface of the second cover plate 30 is set as an arc-shaped surface, and the arc-shaped surface can be produced by machining; or, the edge part of the second cover plate 30 is integrally bent to form an arc-shaped structure, for example, processing methods such as hot bending can be used to carry out bending.
  • the edge of the second cover plate 30 by setting the edges of the second cover plate 30 at the four sides to be arc-shaped, the problem of stress concentration on the edges of the second cover plate 30 can be avoided during the drop test process, so that the Avoid damage to the cover; in addition, when the edge of the second cover 30 is integrally bent to form an arc structure, the edge of the second display panel 22 can also be bent along with the edge of the second cover 30 to form Arc-shaped structure; this can facilitate the realization of a full-screen display.
  • the present disclosure is not limited to setting the edge portions of the second cover plate 30 at the four sides into an arc shape, and the edge portions of the second cover plate 30 located at opposite two sides can also be arranged in an arc shape. Depends on product requirements.
  • the sub display screen of the embodiment of the present disclosure is located in a half area of the foldable display device, the sub display screen has only three sides close to the edge of the entire foldable display device, and the other side is close to the entire foldable display device. middle area.
  • the structure of the first cover plate 29 is designed in the embodiment of the present disclosure, and the structure of the first cover plate 29 is described in detail below with reference to the accompanying drawings.
  • the first surface 29a may include a center plane 290 and an edge plane 291, a first edge arc surface 292, a second edge arc surface 293 and a third edge arc surface 294 that surround the center plane 290 and are connected end to end in sequence;
  • the edge plane 291 and the second edge camber 293 are oppositely arranged in the first direction X, and the first edge camber 292 and the third edge camber 294 are oppositely arranged in the second direction Y; it should be noted that this edge plane 291 Located on the side of the second edge arc surface 293 close to the foldable area S3, as shown in FIG. 9, FIG. 12 and FIG.
  • the curvature of the first edge arc surface 292 gradually decreases from the second edge arc surface 293 to the edge plane 291 12, 13b, 13c, or in combination with FIGS. 12, 14a and 14b; for the same reason, the curvature of the third edge camber 294 gradually increases from the second edge camber 293 to the edge plane 291 decrease.
  • the area of the outer surface of the first cover plate 29 at the edge of the foldable display device to be an arc, as shown in FIG. 12 , FIG. 13 b to FIG. 14a to 14c, namely: the first edge arc surface 292, the second edge arc surface 293 and the third edge arc surface 294; on the one hand, the problem of stress concentration on the edge of the first cover plate 29 can be avoided during the drop test process. , so that the damage of the first cover 29 can be avoided, the product reliability of the first cover 29 and the entire foldable display device during the falling process can be improved, and on the other hand, the first cover 29 and the user's hand can be appropriately increased.
  • the contact area of the upper part can be properly relieved from the concentrated stress generated by the edge of the first cover plate 29 on the user's hand during the hand-holding process, and the user experience can be improved.
  • the foldable display device is in an unfolded state
  • the gap generated in the middle of the back ie: the plane where the first surface 29a of the first cover 29 is located
  • the foldable display device can also be enlarged. In this way, when the back of the foldable display device is used as a supporting surface, the problem of stress concentration in the middle of the back of the foldable display device can be alleviated, and the service life of the product can be prolonged.
  • the curvatures of the first edge arc surface 292 and the third edge arc surface 294 need to be gradually reduced from the second edge arc surface 293 to the edge plane 291.
  • this design can prevent the curvature difference between the first edge cambered surface 292 and the third edge cambered surface 294 and the edge plane 291 from being too different. If it is too large, the problem of stress concentration is likely to occur in contact with each other, which improves the structural strength of the first cover plate 29 and prolongs its service life.
  • the curvature of the first edge arc surface 292 at the contact with the edge plane 291 may be 0; the curvature of the third edge arc surface 294 at the contact with the edge plane 291 may be 0, further avoiding the first edge arc
  • the problem of stress concentration easily occurs between the surface 292 , the third edge arc surface 294 and the edge plane 291 , thereby improving the structural strength and prolonging the service life of the first cover plate 29 .
  • the width of the first edge arc surface 292 where it meets the edge plane 291 is W1
  • the width of the first edge arc surface 292 where it meets the second edge arc surface 293 is W2
  • W2 and W1 The ratio is 0.5 to 0.8, such as: 0.5, 0.55, 0.65, 0.7, 0.75, 0.8, etc.
  • W1 can be 4mm
  • W2 can be 3mm
  • this design avoids the edge that is easy to appear during the drop test process While the damage and smooth transition can be achieved, the proportion of the edge camber can be reduced.
  • it can ensure the structural strength of the product itself, and on the other hand, it can improve the visual effect and user experience.
  • the third edge camber 294 The width at the point where it meets the edge plane 291 is W3, the width at the point where the third edge arc surface 294 meets the second edge arc surface 293 is W4, and the ratio between W4 and W3 is 0.5 to 0.8, for example: 0.5, 0.55 , 0.65, 0.7, 0.75, 0.8, etc.
  • W3 may be 4 mm
  • W4 may be 3 mm; it should be noted that the widths W1, W2, W3, and W4 are the dimensions in the second direction Y.
  • the curvature of the second edge arc surface 293 in the second direction Y is the same everywhere, so as to reduce the difficulty of processing.
  • the curvature of the first edge arc surface 292 where it meets the second edge arc surface 293 may be the same as the curvature of the second edge arc surface 293, but is not limited to this, and may also be different, depending on the specific situation
  • the curvature of the third edge arc surface 294 at the junction with the second edge arc surface 293 may be the same as the curvature of the third edge arc surface 294, but it is not limited to this, and may also be different, depending on the specific situation.
  • the second surface 29 b of the first cover plate 29 can be flat as a whole, which can reduce the difficulty of processing the first cover plate 29 , to reduce costs.
  • the area opposite to the central plane 290 and the area opposite to the edge plane 291 in the second surface 29b of the first cover plate 29 may both be planes; with reference to FIG. 11 , FIG. 12 and FIG. 14 a
  • the area opposite to the first edge arc surface 292, the area opposite to the second edge arc surface 293 and the area opposite to the third edge arc surface 294 in the second surface 29b are arc surfaces, that is, In other words, the part of the first cover plate 29 close to the edge region of the entire foldable display device can be bent in an arc-shaped structure as a whole.
  • the curvature of the area of the second surface 29b opposite to the first edge arc surface 292 is the same as the curvature of the first edge arc surface 292; the curvature of the area of the second surface 29b opposite to the second edge arc surface 293 is the same as that of the second The curvature of the edge arc surface 293 is the same; the curvature of the region opposite to the third edge arc surface 294 in the second surface 29b is the same as the curvature of the third edge arc surface 294; but not limited to this, the curvature of the corresponding part can also be different, depending on the specific Depends.
  • the part of the first display panel 10 close to the edge region of the entire foldable display device can also be Along with the edge portion of the first cover plate 29, it is bent to form an arc-shaped structure, which can facilitate the realization of a full-screen display.
  • the position between the first cover plate 29 and the first display panel 10 may refer to FIG. 9 and FIG. 12 and FIG. 15 .
  • the first display panel 10 has a display area ( The area enclosed by the double-dot chain line in FIG. 15 ) and the non-display area set around the display area (the area enclosed by the double-dot chain line and the dotted line in FIG.
  • the display area has opposite directions in the second direction Y
  • the first boundary L1 and the second boundary L2, the first boundary L1 and the second boundary L2 both extend in the first direction X;
  • the boundary of the first edge arc surface 292 that is in contact with the central plane 290 is the third boundary L3, the first boundary
  • the three boundaries L3 intersect the first boundary L1, and the intersection point is the first intersection point K1;
  • the boundary of the third edge arc surface 294 that is in contact with the center plane 290 is the fourth boundary L4, and the fourth boundary L4 intersects the second boundary L2 , and its intersection is the second intersection K2.
  • the ratio of the length of the line segment located at the first intersection K1 and close to the second edge arc surface 293 in the first boundary L1 to the length of the line segment located at the first intersection K1 and close to the edge plane 291 in the first boundary L1 is 0.2 to 0.5, for example: 0.2 , 0.3, 0.4, 0.5, etc.
  • this design can reduce the influence of the cover on the display while achieving smoothing; similarly, the length of the line segment located at the second intersection K2 in the second boundary L2 and close to the second edge arc surface 293
  • the ratio to the length of the line segment in the second boundary L2 located at the second intersection K2 close to the edge plane 291 is 0.2 to 0.5, for example: 0.2, 0.3, 0.4, 0.5 and so on.
  • the first display panel 10 may include a display portion 10a, a binding portion 10b located on the back side of the display portion 10a, and a bending portion 10c connecting the display portion 10a and the binding portion 10b; wherein 2, 4, 9, 12 and 15, a part of the orthographic projection of the binding portion 10b on the reference plane is located in the orthographic projection of the third edge arc surface 294 on the reference plane, and the other part Located within the orthographic projection of the central plane 290 on the reference plane, it should be understood that the reference plane referred to here is the plane parallel to the central plane 290 .

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Abstract

一种盖板（29）及可折叠显示装置。此盖板（29）用于可折叠显示装置，其中，盖板（29）中远离第一显示面板（10）的表面为第一表面（29a）；第一表面（29a）包括中心平面（290）以及环绕中心平面（290）并依次首尾相连的边缘平面（291）、第一边缘弧面（292）、第二边缘弧面（293）及第三边缘弧面（294）；边缘平面（291）和第二边缘弧面（293）在第一方向（X）上相对设置，第一边缘弧面（292）和第三边缘弧面（294）在第二方向（Y）上相对设置，第二方向（Y）与第一方向（X）相互垂直；其中，边缘平面（291）位于第二边缘弧面（293）靠近可折叠区域（S3）的一侧；且第一边缘弧面（292）和第三边缘弧面（294）的曲率自第二边缘弧面（293）至边缘平面（291）逐渐减小。

Description

盖板及可折叠显示装置
交叉引用
本公开要求于2020年10月30日提交的申请号为202011190597.2名称为“盖板及可折叠显示装置”的中国专利申请的优先权，该中国专利申请的全部内容通过引用全部并入本文。
技术领域
本公开涉及显示技术领域，具体而言，涉及一种盖板及可折叠显示装置。
背景技术
目前，折叠显示产品(例如：折叠手机)正在迅速崛起，对于内折显示产品通常都会在折叠显示产品的背面配一块副显示屏作为其中一种使用场景；此副显示屏的大小通常为主显示屏的大小的一半，装在整机上，有三个边与折叠显示产品的边框相邻，另一边位于折叠显示产品中间的位置。其中，在折叠显示产品的背面增加一块副显示屏虽然可使折叠显示产品具有多种使用场景，但会降低折叠显示产品的信赖性，例如：在跌落测试过程中副显示屏容易发生损坏。
需要说明的是，在上述背景技术部分公开的信息仅用于加强对本公开的背景的理解，因此可以包括不构成对本领域普通技术人员已知的现有技术的信息。
公开内容
本公开的目的在于提供一种盖板和可折叠显示装置，提高了产品信赖性。
本公开第一方面提供了一种盖板，用于可折叠显示装置，所述可折叠显示装置具有第一区域、第二区域及连接所述第一区域与所述第二区域之间的可折叠区域，其中，所述可折叠显示装置包括位于所述第一区域的第一显示面板，所述盖板能够位于所述第一区域并设置在所述第一显示面板的显示侧；
所述盖板中远离所述第一显示面板的表面为第一表面；所述第一表面包括中心平面以及环绕所述中心平面并依次首尾相连的边缘平面、第一边缘弧面、第二边缘弧面及第三边缘弧面；所述边缘平面和所述第二边缘弧面在第一方向上相对设置，所述第一边缘弧面和所述第三边缘弧面在第二方向上相对设置，所述第二方向与所述第一方向相互垂直；
其中，所述边缘平面位于所述第二边缘弧面靠近所述可折叠区域的一侧；且所述第一边缘弧面和所述第三边缘弧面的曲率自所述第二边缘弧面至所述边缘平面逐渐减小。
在本公开的一种示例性实施例中，
所述第一边缘弧面中与所述边缘平面相接处的曲率为0；
所述第三边缘弧面中与所述边缘平面相接处的曲率为0。
在本公开的一种示例性实施例中，
所述第一边缘弧面中与所述边缘平面相接处的宽度为W1，所述第一边缘弧面中与所述第二边缘弧面相接处的宽度为W2，所述W2与所述W1的比值为0.5至0.8；
所述第三边缘弧面中与所述边缘平面相接处的宽度为W3，所述第三边缘弧面中与所述第二边缘弧面相接处的宽度为W4，所述W4与所述W3的比值为0.5至0.8；
其中，所述宽度为在所述第二方向上的尺寸。
在本公开的一种示例性实施例中，
所述第二边缘弧面在所述第二方向上各处的曲率相同。
在本公开的一种示例性实施例中，
所述盖板中靠近所述第一显示面板的表面为第二表面，其中，所述第二表面为平面。
在本公开的一种示例性实施例中，
所述盖板中靠近所述第一显示面板的表面为第二表面，其中，
所述第二表面中与所述中心平面相对的区域及与所述边缘平面相对的区域均为平面；
所述第二表面中与所述第一边缘弧面相对的区域、与所述第二边缘弧面相对的区域及与所述第三边缘弧面相对的区域均为弧面。
在本公开的一种示例性实施例中，
所述第二表面中与所述第一边缘弧面相对的区域的曲率与所述第一边缘弧面的曲率相同；
所述第二表面中与所述第二边缘弧面相对的区域的曲率与所述第二边缘弧面的曲率相同；
所述第二表面中与所述第三边缘弧面相对的区域的曲率与所述第三边缘弧面的曲率相同。
本公开第二方面提供了一种可折叠显示装置，所述可折叠显示装置具有第一区域、第二区域及连接所述第一区域与所述第二区域之间的可折叠区域，其中，所述可折叠显示装置包括位于所述第一区域的第一显示面板和第一盖板，所述第一盖板设置在所述第一显示面板的显示侧，所述第一盖板为上述任一项所述的盖板。
在本公开的一种示例性实施例中，
所述第一显示面板具有显示区域及环绕所述显示区域设置的非显示区域，所述显示区域具有在所述第二方向上相对的第一边界和第二边界，所述第一边界和所述第二边界均在所述第一方向上延伸；
所述第一边缘弧面中与所述中心平面相接的边界为第三边界，所述第三边界与所述第一边界相交，且其交点为第一交点；
所述第三边缘弧面中与所述中心平面相接的边界为第四边界，所述第四边界与所述第二边界相交，且其交点为第二交点；其中，
所述第一边界中位于所述第一交点靠近所述第二边缘弧面的线段长度与所述第一边界中位于所述第一交点靠近所述边缘平面的线段长度之比为0.2至0.5；
所述第二边界中位于所述第二交点靠近所述第二边缘弧面的线段长度与所述第二边界中位于所述第二交点靠近所述边缘平面的线段长度之比为0.2至0.5。
在本公开的一种示例性实施例中，
所述第一显示面板具有柔性；且所述第一显示面板包括显示部、位于所述显示部背侧的绑定部及连接所述显示部与所述绑定部的弯折部；所述显示部的显示侧设置有所述第一盖板，且所述显示部包括所述显示 区域和所述非显示区域；
其中，所述绑定部在参考平面上的正投影的一部分位于所述第三边缘弧面在所述参考平面上的正投影内，另一部分位于所述中心平面在参考平面上的正投影内，所述参考平面为与所述中心平面相平行的面。
在本公开的一种示例性实施例中，
所述可折叠显示装置还包括位于所述第一区域、所述第二区域及所述可折叠区域的第二显示面板和第二盖板；
其中，所述第二显示面板与所述第二盖板具有柔性，所述第二显示面板中远离所述第一显示面板的一侧为显示侧，所述第二盖板位于所述第二显示面板的显示侧，且所述第二盖板的外轮廓超出所述第二显示面板的外轮廓。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本发明。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本公开的实施例，并与说明书一起用于解释本公开的原理。显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1示出了本公开一实施例所述的可折叠显示装置处于折叠状态下的结构示意图；
图2示出了本公开一实施例所述的可折叠显示装置处于展开状态下的结构示意图；
图3示出了本公开另一实施例所述的可折叠显示装置处于展开状态下的结构示意图；
图4示出了图2中一实施例所述的可折叠显示装置沿P-P线的剖视示意图；
图5示出了图2中一实施例所述的可折叠显示装置沿N-N线的剖视示意图；
图6示出了图2中另一实施例所述的可折叠显示装置沿N-N线的剖视示意图；
图7示出了图2中又一实施例所述的可折叠显示装置沿N-N线的剖视示意图；
图8示出了图2中再一实施例所述的可折叠显示装置沿M-M线的剖视示意图；
图9示出了本公开又一实施例所述的可折叠显示装置处于展开状态下的结构示意图；
图10示出了图9中一实施例所述的可折叠显示装置的第一盖板的侧视示意图；
图11示出了图9中另一实施例所述的可折叠显示装置的第一盖板的侧视示意图；
图12示出了图9中一实施例所述的可折叠显示装置的第一盖板在外视角下的平面示意图；
图13a示出了图12中一实施例所述的第一盖板沿Q-Q线的剖视示意图；
图13b示出了图12中一实施例所述的第一盖板沿R-R线的剖视示意图；
图13c示出了图12中一实施例所述的第一盖板沿T-T线的剖视示意图；
图13d示出了图12中一实施例所述的第一盖板沿H-H线的剖视示意图；
图14a示出了图12中另一实施例所述的第一盖板沿R-R线的剖视示意图；
图14b示出了图12中另一实施例所述的第一盖板沿T-T线的剖视示意图；
图14c示出了图12中另一实施例所述的第一盖板沿H-H线的剖视示意图；
图15示出了图9中一实施例所述的可折叠显示装置的第一盖板在外视角下的平面示意图。
具体实施方式
为使本公开的目的、技术方案和优点更加清楚明白，下文中将结合附图对本公开的实施例进行详细说明。注意，实施方式可以以多个不同形式来实施。所属技术领域的普通技术人员可以很容易地理解一个事实，就是方式和内容可以在不脱离本公开的宗旨及其范围的条件下被变换为各种各样的形式。因此，本公开不应该被解释为仅限定在下面的实施方式所记载的内容中。在不冲突的情况下，本公开中的实施例及实施例中的特征可以相互任意组合。
在附图中，有时为了明确起见，夸大表示了各构成要素的大小、层的厚度或区域。因此，本公开的一个方式并不一定限定于该尺寸，附图中各部件的形状和大小不反映真实比例。此外，附图示意性地示出了理想的例子，本公开的一个方式不局限于附图所示的形状或数值等。
需要说明的是，本文中所述的“在……上”可以表示一层直接形成或设置在另一层上，也可以表示一层间接形成或设置在另一层上，即两层之间还存在其它的层。
用语“一”、“该”、“此”用以表示存在一个或多个要素/组成部/等；用语“包括”用以表示开放式的包括在内的意思并且是指除了列出的要素/组成部/等之外还可存在另外的要素/组成部/等。
本说明书中的“第一”、“第二”等序数词是为了避免构成要素的混同而设置，而不是为了在数量方面上进行限定的。
在本说明书中，除非另有明确的规定和限定，术语“连接”应做广义理解。例如，可以是固定连接，或可拆卸连接，或一体地连接；可以是机械连接，或电连接；可以是直接相连，或通过中间件间接相连，或两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本公开中的具体含义。
本公开实施例提供了一种可折叠显示装置，此可折叠显示装置具有第一区域S1、第二区域S2及连接第一区域S1与第二区域S2之间的可折叠区域S3；如图1所示，此可折叠显示装置可具有折叠状态，在可折叠显示装置处于折叠状态时，可折叠区域S3整体可呈折弯状态，而第一区域S1和第二区域S2在可折叠显示装置的厚度方向Z上排布；如图 2和图3所示，可折叠显示装置还可具有展开状态，在可折叠显示装置处于展开状态时，可折叠区域S3整体可呈平面状态，而第一区域S1和第二区域S2则在第一方向X上排布，此第一方向X与可折叠显示装置的厚度方向Z相垂直。
需要说明的是，如图1所示，本公开实施例的可折叠区域S3在可折叠显示装置呈折叠状态时可相对第一区域S1和第二区域S2完全露出。而本公开实施例的可折叠区域S3在可折叠显示装置呈展开状态时可相对第一区域S1和第二区域S2完全露出，参考图2所示；但不限于此，本公开实施例的可折叠区域S3在可折叠显示装置呈展开状态时也可至少部分隐藏于第一区域S1和第二区域S2内，参考图3所示。
此外，还需说明的是，在可折叠显示装置处于折叠状态时，第一区域S1整体和第二区域S2整体基本不发生弯折。
下面结合附图对本公开实施例的可折叠显示装置的结构进行详细说明。
可折叠显示装置可包括位于第一区域S1的第一显示面板10和第一盖板29，此第一盖板29设置在第一显示面板10的显示侧；此第一盖板29和第一显示面板10整体可构成可折叠显示装置的一块显示屏。
需要说明的是，由于前述提到在可折叠显示装置处于折叠状态时，第一区域S1整体基本不发生弯折，因此，第一盖板29可为柔性较差(即：不易发生形变)的玻璃盖板，但不限于此，也可为柔性较好(即：容易发生形变)的采用高分子聚合物制作的盖板。同理，第一显示面板10可为不易发生形变的硬质面板，也可为易发生形变的柔性面板。
举例而言，本公开实施例的第一显示面板10可为柔性面板，即：第一显示面板可具有柔性，具体地，如图4所示，此第一显示面板10可包括显示部10a、位于显示部10a背侧的绑定部10b及连接显示部10a与绑定部10b的弯折部10c，此显示部10a可为OLED(Organic Light Emitting Diode)显示，但不限于此；应当理解的是，前述提到的第一盖板29需设置在显示部10a的显示侧，即：第一盖板29设置在显示部10a远离绑定部10b的一侧；其中，第一盖板29可通过粘接层34粘接在显示部10a的一侧。此外，需要说明的是部，本公开实施例的第一显示面 板10的结构不限于前述提到的弯折结构，也可整体为平面结构。
可选地，如图4所示，显示部10a的背侧可设置有第一散热膜层36；此第一散热膜层36在显示部10a上的正投影位于显示部10a内或与之重合；举例而言，第一散热膜层36可为多层结构，此第一散热膜层36可包括依次设置的EMBO(压花硅胶缓冲材料)层、Foam(泡沫材料)层、PI(聚酰亚胺薄膜)层、Cu(铜)箔层及吸波材料层等等；但不限于此，第一散热膜层36也可由其他膜层构成，只要能够保证第一散热膜层36具有良好的散热性能和可弯折性能即可。此外，第一散热膜层36也可为单层结构，视具体情况而定。
其中，如图4所示，第一散热膜层36与绑定部10b之间还可设置有垫高膜层37，通过设置此垫高膜层37可保证第一显示面板10的弯曲弧度和弯曲稳定性。
此外，如图4所示，弯折部10c的外侧可覆盖有应变中性胶层38，此应变中性胶层38还可覆盖显示部10a和绑定部10b的边缘部分；通过设置应变中性胶层38可对弯折部10c进行保护，避免其在弯折过程中出现断裂的情况；举例而言，此应变中性胶层38可为有机胶材。
在本公开的一实施例中，如图5所示，可折叠显示装置还可包括第一柔性电路板11及刚性膜片12，其中：
第一柔性电路板11可设置在第一散热膜层36远离显示部10a的一侧；如图5所示，此第一柔性电路板11可包括第一部110、第二部111及连接第一部110和第二部111的弯曲部112，具体地，弯曲部112在显示部10a上的正投影可位于显示部10a的显示区域；第一部110可与绑定部10b电连接；第二部111可位于第一部110远离显示部10a的一侧，应当理解的是，如图6所示，本公开实施例的显示装置还可包括第一主电路板13，此第二部111可与第一主电路板13电连接，需要说明的是，此第一主电路板13可位于第二部111远离第一部110的一侧。
如图5和图6所示，第一散热膜层36远离显示部10a的一侧与弯曲部112之间可设置有刚性膜片12；此刚性膜片12在显示部10a上的正投影可位于第一散热膜层36在显示部10a上的正投影内；且此刚性膜片12可支撑第一柔性电路板11的弯曲部112，应当理解的是，刚性膜片 12的刚性可大于第一散热膜层36和显示部10a的刚性，也就是说，此刚性膜片12相比于显示部10a和第一散热膜层36受力不易发生变形。举例而言，此刚性膜片12的材料可为聚酰亚胺(PI)或不锈钢(SUS)，应当理解的是，用于制作刚性膜片12的PI材料应为硬质PI材料。
此外，刚性膜片12的厚度可为0.1mm至0.5mm，比如：0.1mm、0.2mm、0.3mm、0.4mm、0.5mm等等，通过将刚性膜片12的厚度设计为大于或等于0.1mm，以保证刚性膜片12具有足够的刚性，而将刚性膜片12的厚度设计为小于或等于0.5mm，可降低产品整体厚度。
在本公开实施例中，由于在第一柔性电路板11的弯曲部112与显示部10a的背侧之间设置有刚性膜片12，且刚性膜片12受力不易发生变形，这样在装机过程中，此刚性膜片12可对弯曲部112产生的回弹力进行分散释放，因此，可避免显示部10a的显示区域中与弯曲部112对应的位置产生明显模印的情况，提高了显示效果。
需要说明的是，本公开实施例的第一柔性电路板11的弯曲部112不限于设置在显示部10a的显示区域，也可设置在非显示区域。
在本公开的实施例中，装机过程可为：先将第一柔性电路板11的第二部111与第一主电路板13电连接，然后再将第一柔性电路板11进行弯折，以形成前述提到的弯曲部112并使其第一部110位于第二部111远离第一主电路板13的一侧。需要说明的，第一部110可在第二部111与第一主电路板13电连接之前先与绑定部10b电连接，或第一部110可在其弯折到第二部111远离第一主电路板13的一侧时再与绑定部10b电连接。
如图6所示，第一主电路板13上可设置有第一连接端子14，第一柔性电路板11的第二部111可设置有能够与第一连接端子14扣装或插装的配合端子15，即：通过配合端子15与第一连接端子14扣装或插装以实现第一主电路板13与第二部111的电连接。
在本公开的实施例中，此第一柔性电路板11的弯曲部112对应的弯折轴线可在第二方向Y(如图2至图4)上延伸，且弯曲部112在显示部10a上的正投影具有在第一方向X上相对的第一边界A和第二边界B，需要说明的是，此第二边界B为弯曲部112中靠近第一部110和第二部 111的一侧，第一边界A为弯曲部112中远离第一部110和第二部111的一侧，如图5和图6所示；而刚性膜片12在显示部10a上的正投影具有在第一方向X上相对的第三边界C和第四边界D，如图5和图6所示，此第三边界C位于第一边界A远离第二边界B的一侧，第四边界D位于第二边界B远离第一边界A的一侧。
本实施例中，通过使弯曲部112的第一边界A和第二边界B位于刚性膜片12的第三边界C和第四边界D的内侧，可使刚性膜片12更好地对弯曲部112产生的回弹力进行分散，具体地，相比于弯曲部112的第一边界A和第二边界B位于刚性膜片12的第三边界C和第四边界D的外侧的方案，可避免弯曲部112产生的回弹力集中在刚性膜片12的第三边界C和第四边界D，从而可避免显示部10a中与刚性膜片12的第三边界C和第四边界D对应的位置产生模印的情况，以避免提高显示效果。
需要说明的是，本公开实施例提到的第一方向X与第二方向Y相垂直；且第一方向X、第二方向Y均与可折叠显示装置的厚度方向Z相垂直。
可选地，刚性膜片12的第三边界C与弯曲部112的第一边界A在第一方向X上的间距可等于刚性膜片12的第四边界D与弯曲部112的第二边界B在第一方向X上的间距，这样可保证刚性膜片12整体受力均匀性，以更好地起到分散应力的作用；但不限于此，刚性膜片12的第三边界C与弯曲部112的第一边界A在第一方向X上的间距与刚性膜片12的第四边界D与弯曲部112的第二边界B在第一方向X上的间距也可不相等。
在本公开实施例中，刚性膜片12的第三边界C与弯曲部112的第一边界A在第一方向X上的间距可大于或等于1cm；刚性膜片12的第四边界D与弯曲部112的第二边界B在第一方向X上的间距大于或等于1cm，这样设计使得刚性膜片12能够更好地起到分散应力的作用。
需要说明的是，本公开实施例的刚性膜片12的面积可根据实际情况而定，只要能够更好地起到分散应力的作用以避免装机模印即可。
在本公开的一些实施例中，如图6所示，弯曲部112的弯折空间内可设置有缓冲部16，且缓冲部16在显示部10a上的正投影位于刚性膜 片12在显示部10a上的正投影内；具体地，缓冲部16可设置在弯曲部112靠近第一部110的位置上，且缓冲部16在显示部10a上的正投影位于刚性膜片12在显示部10a上的正投影的中心区域。
在本实施例中，通过在弯曲部112的弯折空间内设置缓冲部16，这样设计使得缓冲部16能够为弯曲部112提供一定缓冲力，以保证弯曲部112具有良好的恢复形变能力，避免在装机过程中弯曲部112形成死折的情况。
应当理解的是，本公开实施例的可折叠显示装置还可包括中框结构，此中框结构包括位于第一区域S1的第一中框，详细说明，如图7所示，此第一中框可包括第一安装板17和第一侧板18，此第一安装板17具有相对的第一安装面170和第二安装面171，而第一侧板18设置在第一安装面170的周边，并与第一安装面170围成第一安装槽19；需要说明的是，在第一安装面170为矩形时，第一侧板18可环绕设置在第一安装面170的四边，但不限于此，也可设置在三边，或设置在相对两边等等，视具体情况而定。
其中，前述提到的第一显示面板10、第一柔性电路板11、刚性膜片12、第一主电路板13、第一连接端子14、配合端子15、缓冲部16可位于第一安装槽19内，具体地，第一部110位于第二部111远离第一安装面170的一侧；需要说明的是，如图7所示，第一安装面170上可设置有与弯曲部112对应的避让槽170a，且第一安装面170上设置有第一装配槽170b；前述提到的第一主电路板13可具体位于第一装配槽170b内，第一连接端子14的部分伸出第一装配槽170b并与第二部111上的配合端子15插合或扣合。
可选地，第一盖板29的边缘超出显示部10a的边缘，且第一盖板29超出显示部10a的部分可搭在第一侧板18远离第一安装面170上的端面；具体地，第一侧板18远离第一安装面170的端面上可设置有定位凹槽，第一盖板29超出部分可搭载在第一侧板18的定位凹槽，参考图7所示。
应当理解的是，本公开的实施例中的中框结构可为折叠机构，除了前述提到的位于第一区域S1的第一中框，还可包括与第一中框转动连 接且位于第二区域S2的第二中框，如图8所示，第二中框可与第一中框通过铰链机构20转动连接，此铰链机构20可位于可折叠区域S3。
其中，如图8所示，第二中框至少可包括第二安装板21，第二安装板21具有相对的第三安装面210和第四安装面211，其中，第一中框与第二中框相对转动能够使得第三安装面210转动至面向第二安装面171的位置。
可选地，如图8所示，本公开实施例的可折叠显示装置还可包括位于第一区域S1、第二区域S2及可折叠区域S3的第二显示面板22，此第二显示面板22可位于第二安装面171远离第一安装面170的一侧且位于第三安装面210远离第四安装面211的一侧，应当理解的是，第二显示面板22面向第二安装面171和第三安装面210的一侧为第二显示面板22的背侧，第二显示面板22远离第二安装面171和第三安装面210的一侧为显示侧；举例而言，如图8所示，第二显示面板22可包括显示基板220和第二散热膜层221，第二散热膜层221可设置在显示基板220的背侧；此第二散热膜层221在显示基板220上的正投影位于显示基板220内或与之重合。
此外，第二散热膜层221与前述提到的第一散热膜层36的结构可相同，在此不再重复赘述。
其中，第二显示面板22可为柔性显示面板，即：第二显示面板22具有柔性，在第一中框与第二中框相对转动以使得第三安装面210转动至面向第二安装面171的位置的同时，第二显示面板22能够发生弯折，也就是说，整个可折叠显示装置能够发生内折，即：显示基板220的显示面位于弯折内侧。
在本公开的实施例中，如图8所示，可折叠显示装置还可包括第二主电路板23及第二柔性电路板24；其中，第二主电路板23可设置在第一安装板17或第二安装板21上，第二主电路板23上设置有第二连接端子；第二柔性电路板24的一端与第二连接端子25电连接，另一端与第二显示面板22电连接。需要说明的是，第二柔性电路板24的一端可在第二显示面板22的显示侧与第二显示面板22进行绑定；但不限于此，也可为第二显示面板22的部分向远离其显示侧的位置弯曲形成绑定部， 然后再与第二柔性电路板24电连接。
举例而言，如图8所示，前述提到的第一安装面170上还可设置第二装配槽170c，且第一安装板17上还设置有贯穿第一安装面170和第二安装面171的通孔(图中未标示出)，此通孔与第二装配槽170c连通；而第二主电路板23和第二连接端子25位于第二装配槽170c内，且第二柔性电路板24的一端穿过通孔与第二连接端子25电连接。
需要说明的是，第二主电路板23和第一主电路板13可为一体式结构或相互独立设置，应当理解的是，在第二主电路板23与第一主电路板13为一体式结构时，第一装配槽170b和第二装配槽170c可相互连通。
在本公开的实施例中，如图8所示，第一安装板17中第二安装面171的周边可设置第二侧板26，应当理解的是，第二安装面171中与第三安装面210相邻的一边可不设置第二侧板26，其余三边均可设置，但不限于此；第二安装板21中第三安装面210的周边可设置第三侧板27，应当理解的是，第三安装面210中与第二安装面171相邻的一边可不设置第三侧板27，其余三边均可设置，但不限于此；其中，此第二侧板26、第二安装面171、第三安装面210及第三侧板27可围成第二安装槽28，前述提到的第二显示面板22、第二柔性电路板24可位于第二安装槽28内。
如图8所示，本公开实施例的可折叠显示装置还可包括位于第一区域S1、第二区域S2及可折叠区域S3的第二盖板30，第二盖板30位于第二显示面板22的显示侧，即：第二盖板30可设置在第二显示面板22远离第二安装面171和第三安装面210的一侧，此第二盖板30与第二显示面板22可构成可折叠显示装置的另一块显示屏。其中，此第二盖板30的边缘也可超出第二显示面板22的边缘；第二盖板30的外轮廓可超出第二显示面板22的外轮廓。
需要说明的是，此第二盖板30可为柔性盖板，例如：其可采用高分子聚合物材料制作而成，也就是说，此第二盖板30能够弯折，具体地，在第一中框与第二中框相对转动以使得第三安装面210转动至面向第二安装面171的位置的同时，第二盖板30能够随着第二显示面板22 一起发生弯折。
其中，如图8所示，第四安装面211的周边也可设置第四侧板33，需要说明的是，在第四安装面211为矩形时，第四侧板33可环绕设置在第四安装面211的四边，但不限于此，也可设置在三边，或设置在相对两边等等，视具体情况而定。
此外，第二中框还可包括与第二安装板21相对的第三安装板31，此第四侧板33可与第三安装板31、第二安装板21的第四安装面211围成第三安装槽32，而显示装置还可包括电池(图中未示出)等结构，此电池可放置在第三安装槽32内，但不限于此，此第三安装槽32内还可设置其他结构。需要说明的是，本公开实施例的第二中框也可不包括第三安装板31，视具体情况而定。
需要说明的是，本公开实施例的第一中框整体可为一体式结构，第二中框整体也可为一体式结构。
在本公开的实施例中，前述提到的第一显示面板10与第一盖板29构成的一块显示屏可为整个可折叠显示装置的副显示屏，而前述提到的第二显示面板22与第二盖板30构成的一块显示屏可为整个可折叠显示装置的主显示屏，在此可折叠显示装置处于展开状态时，可主要使用主显示屏进行显示，但不限于此，也可使用副显示屏进行显示；而在可折叠显示装置处于折叠状态时，可使用副显示屏进行显示。
需要说明的是，在可折叠显示装置处于展开状态时，副显示屏所在侧可为整个可折叠显示装置的背视侧，主显示屏所在侧可为整个可折叠显示装置的正视侧。此外，本公开实施例的主显示屏和副显示屏整体均可呈矩形设计。
在本公开的实施例中，可折叠显示装置的具体类型不受特别的限制，本领域常用的显示装置类型均可，具体例如手机、平板电脑等等，本领域技术人员可根据该显示装置的具体用途进行相应地选择，在此不再赘述。
需要说明的是，该可折叠显示装置除了前述提到的结构以外，还包括其他必要的部件和组成，以手机为例，具体例如前壳、背壳、触控功能层、偏光片、电源线等等，本领域善解人意可根据该显示装置的具体 使用要求进行相应地补充，在此不再赘述。
基于前述内容可知，本公开实施例的主显示屏位于可折叠显示装置的整个区域，且主显示屏的四边均靠近整个可折叠显示装置的边缘，因此，为了提高主显示屏在跌落测试过程中的信赖性，可将第二盖板30中位于四边处的边缘部位均设置呈弧形；具体地，如图8所示，可将第二盖板30的边缘部位中远离第二显示面板22的表面设置成弧形面，此弧形面可采用机械加工制作而出；或者，将第二盖板30的边缘部位整体进行弯曲以形成弧形结构，比如，可采用热弯等加工方式进行弯曲。
在本公开的实施例中，通过将第二盖板30中位于四边处的边缘部位均设置呈弧形，这样在跌落测试过程中可避免第二盖板30边缘出现应力集中的问题，从而可避免盖板损坏的情况；此外，在将第二盖板30的边缘部位整体进行弯曲以形成弧形结构时，第二显示面板22的边缘也可跟随第二盖板30的边缘部位一起弯曲形成弧形结构；这样可利于实现全面屏显示。
应当理解的是，本公开不限于将第二盖板30中位于四边处的边缘部位均设置成弧形，也可将第二盖板30中位于相对两边处的边缘部设置成弧形，具体视产品需求而定。
此外，基于前述内容可知，本公开实施例的副显示屏位于可折叠显示装置的半个区域，此副显示屏仅有三边靠近整个可折叠显示装置的边缘，另一边靠近整个可折叠显示装置的中间区域。其中，为了提高副显示屏的产品信赖性，本公开实施例对第一盖板29的结构进行了设计，下面结合附图对第一盖板29的结构进行详细说明。
在本公开的实施例中，如图10和图11所示，第一盖板29中远离第一显示面板10的表面可为第一表面29a，即：此第一表面29a为第一盖板29的外表面；第一盖板29中靠近第一显示面板10的表面可为第二表面29b，即：此第二表面29b为第一盖板29的内表面；其中：
如图12所示，第一表面29a可包括中心平面290以及环绕中心平面290并依次首尾相连的边缘平面291、第一边缘弧面292、第二边缘弧面293及第三边缘弧面294；边缘平面291和第二边缘弧面293在第一方向X上相对设置，第一边缘弧面292和第三边缘弧面294在第二方向Y上 相对设置；需要说明的是，此边缘平面291位于第二边缘弧面293靠近可折叠区域S3的一侧，结合图9、图12及图13a所示；且第一边缘弧面292的曲率自第二边缘弧面293至边缘平面291逐渐减小，结合图12、图13b、图13c，或结合图12、图14a和图14b所示；同理，和第三边缘弧面294的曲率自第二边缘弧面293至边缘平面291也逐渐减小。
在本公开的实施例中，通过将第一盖板29的外表面中位于可折叠显示装置边缘的区域设置呈弧面，结合图12、图13b至图13d所示，或结合图12、图14a至图14c所示，即：第一边缘弧面292、第二边缘弧面293及第三边缘弧面294；一方面在跌落测试过程中可避免第一盖板29边缘出现应力集中的问题，从而可避免第一盖板29损坏的情况，提高第一盖板29及整个可折叠显示装置在跌落过程中的产品信赖性，另一方面还可适当增大第一盖板29与用户手部的接触面积，以适当缓解手持过程中第一盖板29的边缘对用户手部产生集中应力的情况，提高用户体验。
此外，通过将第一盖板29的外表面中位于可折叠显示装置中间的区域设置为平面，结合图12及图13a所示，即：边缘平面291；一方面在可折叠显示装置呈展开状态时，可减小可折叠显示装置中背面(即：第一盖板29的第一表面29a所在的平面)中间处所产生的缝隙，提高产品质量；另一方面，还可增大可折叠显示装置中背面的支撑面积，这样在可折叠显示装置的背面作为支撑面时，可缓解其背面的中间处出现应力集中的问题，延长产品使用寿命。
其中，为了使得第一盖板29的边缘处平滑过渡，因此，需使第一边缘弧面292和第三边缘弧面294的曲率自第二边缘弧面293至边缘平面291逐渐减小，结合图12、图13b及图13c所示，或结合图12、图14a及图14b所示，这样设计可避免第一边缘弧面292和第三边缘弧面294与边缘平面291之间曲率相差过大而导致相接触容易出现应力集中的问题，提高了第一盖板29的结构强度及延长了其使用寿命。
可选地，第一边缘弧面292中与边缘平面291相接处的曲率可为0；第三边缘弧面294中与边缘平面291相接处的曲率可为0，进一步避免第一边缘弧面292和第三边缘弧面294与边缘平面291之间容易出现应 力集中的问题，从而提高了第一盖板29的结构强度及延长了其使用寿命。
如图12所示，第一边缘弧面292中与边缘平面291相接处的宽度为W1，第一边缘弧面292中与第二边缘弧面293相接处的宽度为W2，W2与W1的比值为0.5至0.8，比如：0.5、0.55、0.65、0.7、0.75、0.8等等，举例而言，W1可为4mm，W2可为3mm，这样设计在避免边缘处容易在跌落测试过程中出现破损情况以及实现平滑过渡的同时，还可减小边缘弧面的占比，一方面保证产品自身结构强度，另一方面还可改善视觉效果，提高用户体验；同理，第三边缘弧面294中与边缘平面291相接处的宽度为W3，第三边缘弧面294中与第二边缘弧面293相接处的宽度为W4，W4与W3的比值为0.5至0.8，比如：0.5、0.55、0.65、0.7、0.75、0.8等等，举例而言，W3可为4mm，W4可为3mm；需要说明的是，宽度W1、W2、W3、W4为在第二方向Y上的尺寸。
其中，第二边缘弧面293在第二方向Y上各处的曲率相同，以降低加工难度。需要说明的是，第一边缘弧面292中与第二边缘弧面293相接处的曲率与第二边缘弧面293的曲率可相同，但不限于此，也可不同，视具体情况而定；同理，第三边缘弧面294中与第二边缘弧面293相接处的曲率与第三边缘弧面294的曲率可相同，但不限于此，也可不同，视具体情况而定。
结合图10、图12及图13a至图13d所示，在本公开的一实施例中，第一盖板29中第二表面29b整体可为平面，这样可降低第一盖板29的加工难度，以降低成本。
在本公开的另一实施例中，第一盖板29的第二表面29b中与中心平面290相对的区域及与边缘平面291相对的区域可均为平面；结合图11、图12及图14a至图14c所示，第二表面29b中与第一边缘弧面292相对的区域、与第二边缘弧面293相对的区域及与第三边缘弧面294相对的区域均为弧面，也就是说，第一盖板29中靠近整个可折叠显示装置边缘区域的部位整体可弯曲呈弧形结构。
其中，第二表面29b中与第一边缘弧面292相对的区域的曲率与第一边缘弧面292的曲率相同；第二表面29b中与第二边缘弧面293相对 的区域的曲率与第二边缘弧面293的曲率相同；第二表面29b中与第三边缘弧面294相对的区域的曲率与第三边缘弧面294的曲率相同；但不限于此，对应部位曲率也可不同，视具体情况而定。
需要说明的是，在第一盖板29中靠近整个可折叠显示装置边缘区域的部位整体弯曲呈弧形结构的情况下，第一显示面板10中靠近整个可折叠显示装置边缘区域的部位也可跟随第一盖板29的边缘部位一起弯曲形成弧形结构，这样可利于实现全面屏显示。
其中，在本公开的实施例中，第一盖板29与第一显示面板10之间的位置可参考图9、图12级图15所示，具体地，第一显示面板10具有显示区域(图15中双点划线所围成的区域)及环绕显示区域设置的非显示区域(图15中双点划线与虚线所围成的区域)，显示区域具有在第二方向Y上相对的第一边界L1和第二边界L2，第一边界L1和第二边界L2均在第一方向X上延伸；第一边缘弧面292中与中心平面290相接的边界为第三边界L3，第三边界L3与第一边界L1相交，且其交点为第一交点K1；第三边缘弧面294中与中心平面290相接的边界为第四边界L4，第四边界L4与第二边界L2相交，且其交点为第二交点K2。
其中，第一边界L1中位于第一交点K1靠近第二边缘弧面293的线段长度与第一边界L1中位于第一交点K1靠近边缘平面291的线段长度之比为0.2至0.5，比如：0.2、0.3、0.4、0.5等等，这样设计在实现平滑过的同时，可降低盖板对显示的影响；同理，第二边界L2中位于第二交点K2靠近第二边缘弧面293的线段长度与第二边界L2中位于第二交点K2靠近边缘平面291的线段长度之比为0.2至0.5，比如：0.2、0.3、0.4、0.5等等。
需要说明的是，前述实施例中提到第一显示面板10可包括显示部10a、位于显示部10a背侧的绑定部10b及连接显示部10a与绑定部10b的弯折部10c；其中，结合图2、图4、图9、图12及图15所示，绑定部10b在参考平面上的正投影的一部分位于第三边缘弧面294在参考平面上的正投影内，另一部分位于中心平面290在参考平面上的正投影内，应当理解的是，此处提到的参考平面为与中心平面290相平行的面。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想 到本公开的其它实施方案。本公开旨在涵盖本公开的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本公开的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本公开的真正范围和精神由所附的权利要求指出。

Claims (11)

  1. 一种盖板，用于可折叠显示装置，所述可折叠显示装置具有第一区域、第二区域及连接所述第一区域与所述第二区域之间的可折叠区域，其中，所述可折叠显示装置包括位于所述第一区域的第一显示面板，所述盖板位于所述第一区域并设置在所述第一显示面板的显示侧；其中，
    所述盖板中远离所述第一显示面板的表面为第一表面；所述第一表面包括中心平面以及环绕所述中心平面并依次首尾相连的边缘平面、第一边缘弧面、第二边缘弧面及第三边缘弧面；所述边缘平面和所述第二边缘弧面在第一方向上相对设置，所述第一边缘弧面和所述第三边缘弧面在第二方向上相对设置，所述第二方向与所述第一方向相互垂直；
    其中，所述边缘平面位于所述第二边缘弧面靠近所述可折叠区域的一侧；且所述第一边缘弧面和所述第三边缘弧面的曲率自所述第二边缘弧面至所述边缘平面逐渐减小。
  2. 根据权利要求1所述的盖板，其中，
    所述第一边缘弧面中与所述边缘平面相接处的曲率为0；
    所述第三边缘弧面中与所述边缘平面相接处的曲率为0。
  3. 根据权利要求2所述的盖板，其中，
    所述第一边缘弧面中与所述边缘平面相接处的宽度为W1，所述第一边缘弧面中与所述第二边缘弧面相接处的宽度为W2，所述W2与所述W1的比值为0.5至0.8；
    所述第三边缘弧面中与所述边缘平面相接处的宽度为W3，所述第三边缘弧面中与所述第二边缘弧面相接处的宽度为W4，所述W4与所述W3的比值为0.5至0.8；
    其中，所述宽度为在所述第二方向上的尺寸。
  4. 根据权利要求1所述的盖板，其中，
    所述第二边缘弧面在所述第二方向上各处的曲率相同。
  5. 根据权利要求1至4中任一项所述的盖板，其中，
    所述盖板中靠近所述第一显示面板的表面为第二表面，其中，所述第二表面为平面。
  6. 根据权利要求1至4中任一项所述的盖板，其中，
    所述盖板中靠近所述第一显示面板的表面为第二表面，其中，
    所述第二表面中与所述中心平面相对的区域及与所述边缘平面相对的区域均为平面；
    所述第二表面中与所述第一边缘弧面相对的区域、与所述第二边缘弧面相对的区域及与所述第三边缘弧面相对的区域均为弧面。
  7. 根据权利要求6所述的盖板，其中，
    所述第二表面中与所述第一边缘弧面相对的区域的曲率与所述第一边缘弧面的曲率相同；
    所述第二表面中与所述第二边缘弧面相对的区域的曲率与所述第二边缘弧面的曲率相同；
    所述第二表面中与所述第三边缘弧面相对的区域的曲率与所述第三边缘弧面的曲率相同。
  8. 一种可折叠显示装置，其中，所述可折叠显示装置具有第一区域、第二区域及连接所述第一区域与所述第二区域之间的可折叠区域，其中，所述可折叠显示装置包括位于所述第一区域的第一显示面板和第一盖板，所述第一盖板设置在所述第一显示面板的显示侧，所述第一盖板为权利要求1至7中任一项所述的盖板。
  9. 根据权利要求8所述的可折叠显示装置，其中，
    所述第一显示面板具有显示区域及环绕所述显示区域设置的非显示区域，所述显示区域具有在所述第二方向上相对的第一边界和第二边界，所述第一边界和所述第二边界均在所述第一方向上延伸；
    所述第一边缘弧面中与所述中心平面相接的边界为第三边界，所述第三边界与所述第一边界相交，且其交点为第一交点；
    所述第三边缘弧面中与所述中心平面相接的边界为第四边界，所述第四边界与所述第二边界相交，且其交点为第二交点；其中，
    所述第一边界中位于所述第一交点靠近所述第二边缘弧面的线段长度与所述第一边界中位于所述第一交点靠近所述边缘平面的线段长度之比为0.2至0.5；
    所述第二边界中位于所述第二交点靠近所述第二边缘弧面的线段长度与所述第二边界中位于所述第二交点靠近所述边缘平面的线段长度之 比为0.2至0.5。
  10. 根据权利要求9所述的可折叠显示装置，其中，
    所述第一显示面板具有柔性；且所述第一显示面板包括显示部、位于所述显示部背侧的绑定部及连接所述显示部与所述绑定部的弯折部；所述显示部的显示侧设置有所述第一盖板，且所述显示部包括所述显示区域和所述非显示区域；
    其中，所述绑定部在参考平面上的正投影的一部分位于所述第三边缘弧面在所述参考平面上的正投影内，另一部分位于所述中心平面在参考平面上的正投影内，所述参考平面为与所述中心平面相平行的面。
  11. 根据权利要求8所述的可折叠显示装置，其中，
    所述可折叠显示装置还包括位于所述第一区域、所述第二区域及所述可折叠区域的第二显示面板和第二盖板；
    其中，所述第二显示面板与所述第二盖板具有柔性，所述第二显示面板中远离所述第一显示面板的一侧为显示侧，所述第二盖板位于所述第二显示面板的显示侧，且所述第二盖板的外轮廓超出所述第二显示面板的外轮廓。
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