WO2022227479A1 - 可折叠显示装置 - Google Patents

可折叠显示装置 Download PDF

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Publication number
WO2022227479A1
WO2022227479A1 PCT/CN2021/129219 CN2021129219W WO2022227479A1 WO 2022227479 A1 WO2022227479 A1 WO 2022227479A1 CN 2021129219 W CN2021129219 W CN 2021129219W WO 2022227479 A1 WO2022227479 A1 WO 2022227479A1
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WO
WIPO (PCT)
Prior art keywords
foldable
flexible
display device
area
circuit board
Prior art date
Application number
PCT/CN2021/129219
Other languages
English (en)
French (fr)
Inventor
罗璇
黄小霞
熊韧
张兵
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.)
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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
Publication of WO2022227479A1 publication Critical patent/WO2022227479A1/zh

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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
    • 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

Definitions

  • the present disclosure relates to the field of display, and in particular, to a foldable display device.
  • the rise of foldable display devices has enabled the rapid development of foldable display technology.
  • the foldable display device includes a flexible display panel, a flexible cover plate and a flexible printed circuit (FPC).
  • the flexible cover plate is bonded to the surface of the flexible display panel to protect the surface of the flexible display panel.
  • the first side of the flexible display panel is bound with the flexible circuit board, and the flexible circuit board is bent from the front side of the flexible display panel to the back side of the flexible display panel.
  • the flexible cover will shield the flexible circuit board.
  • Embodiments of the present disclosure provide a foldable display device, which improves the problem of wrinkles generated when a flexible cover plate is bent.
  • the technical solution is as follows:
  • the present disclosure provides a foldable display device, the foldable display device includes: a flexible display panel having a first foldable area and a first side edge, the first foldable area includes a first sub-area, and the A part of the first side edge is the boundary of the first sub-area; a flexible cover plate is adhered to the first surface of the flexible display panel, the flexible cover plate has a second foldable area, the second The orthographic projection of the foldable area on the first surface is located inside the first foldable area, the second foldable area is bonded to the first foldable area, and the second foldable area is in the The orthographic projection of the first surface does not coincide with the first sub-area; the flexible circuit board is bound to the first side, and the orthographic projection of the flexible circuit board on the first surface is the same as the first sub-region.
  • the two foldable areas do not overlap.
  • an edge of the flexible cover plate has a notch, and the notch is located in an extending direction of the second foldable region;
  • the flexible circuit board includes two first parts, which are in In the extending direction of the first side edge, the two first parts are respectively located on both sides of the first foldable area; on the first surface, the orthographic projection of the two first parts is the same as the flexible
  • the orthographic projections of the portions of the cover plate located on both sides of the notch are at least partially coincident.
  • the width of the notch is greater than or equal to the width of the second foldable area, and both the width of the notch and the width of the second foldable area are within the The dimension in the extension direction of the first side.
  • the orthographic projection of the flexible circuit board on the first surface does not coincide with the orthographic projection of the flexible cover plate on the first surface.
  • the foldable display device further includes: a housing including an annular baffle, the annular baffle surrounds an edge of the flexible display panel, and the annular baffle and The flexible cover plate is located on the same side of the flexible display panel; there is a gap between the annular baffle and the flexible display panel, the flexible circuit board is located in the gap, and on the first surface, the The orthographic projection of the flexible circuit board is located within the orthographic projection of the annular baffle.
  • a surface of the flexible cover plate away from the flexible display panel is flush with a surface of the annular baffle away from the flexible display panel.
  • the inner edge of the annular baffle is fitted with the edge of the flexible cover plate.
  • the foldable display device further includes: a first adhesive material layer located between the flexible display panel and the flexible cover plate, and the first adhesive material layer is located between the flexible display panel and the flexible cover plate.
  • the orthographic projection of the first surface does not coincide with the orthographic projection of the flexible circuit board on the first surface, and on the side where the first side is located, the edge of the first adhesive material layer protrudes from the The edge of the flexible cover plate, the first glue material layer and the flexible cover plate form a first step, and the annular baffle has a second step matched with the first step.
  • the width of the step surface of the first step ranges from 0.2 mm to 0.5 mm, and the width of the step surface is perpendicular to the extension direction of the first side and A dimension in a direction parallel to the first surface.
  • the housing further includes: a bottom plate opposite to the annular baffle plate; a side plate connected between the outer edge of the bottom plate and the outer edge of the annular baffle plate, the The annular baffle, the bottom plate and the side plate form an accommodating space, and the flexible display panel is located in the accommodating space.
  • the foldable display device further includes: a touch panel located between the flexible display panel and the flexible cover, the touch panel having a third foldable area and a second side, the third foldable area includes a second sub-area, a part of the second side is the boundary of the second sub-area; the second foldable area is in the first
  • the orthographic projection of the surface is located inside the third foldable region, and the orthographic projection of the second foldable region on the first surface does not coincide with the orthographic projection of the second sub-region on the first surface ; a touch flexible circuit board, bound on the second side, the orthographic projection of the touch flexible circuit board on the first surface and the orthographic projection of the third foldable area on the first surface not coincident.
  • both opposite sides of the touch panel are bound to the touch flexible circuit board.
  • the foldable display device further includes: a second adhesive material layer located between the touch panel and the flexible display panel, and the second adhesive material layer is located between the touch panel and the flexible display panel.
  • the orthographic projection of the first surface and the orthographic projection of the touch flexible circuit board on the first surface do not coincide on the side where the second side is located, and the edge of the flexible display panel protrudes from the first surface.
  • the edge of the second glue layer is located between the touch panel and the flexible display panel.
  • the flexible display panel has a second surface, and the second surface and the first surface are opposite surfaces of the support plate, and the foldable display device further It comprises: a support board with opposite third and fourth surfaces, the third surface is attached to the second surface, and the flexible circuit board is bent to the fourth surface of the support board.
  • the support plate has a groove, and the groove extends from the edge of the fourth surface to the middle of the fourth surface; the foldable display device further includes : a drive circuit located in the groove, and the flexible circuit board is electrically connected to the drive circuit.
  • the orthographic projection of the first sub-region of the first foldable region and the second foldable region on the first surface do not overlap, the orthographic projection of the flexible circuit board on the first surface and the second foldable region not coincident. That is, the second foldable area of the flexible cover plate is retracted inwardly, so that the second foldable area of the flexible cover plate is all bonded to the first foldable area.
  • the folded area of the flexible cover plate will be affected by the adhesive force, and no wrinkles will be generated due to bending, which improves the problem of wrinkles generated when the flexible cover plate is bent.
  • FIG. 1 is a plan view of a foldable display device provided in an embodiment of the present disclosure in a planar state;
  • FIG. 2 is a side view of a foldable display device provided in an embodiment of the present disclosure in a bent state
  • Fig. 3 is the sectional schematic diagram of A-A surface in Fig. 1;
  • FIG. 4 is a top view of a flexible display panel provided by an embodiment of the present disclosure.
  • FIG. 5 is a top view of a flexible cover plate provided by an embodiment of the present disclosure.
  • FIG. 6 is a top view of an assembly of a flexible display panel, a flexible cover plate and a flexible circuit board provided by an embodiment of the present disclosure
  • FIG. 7 is a top view of another flexible cover plate provided by an embodiment of the present disclosure.
  • FIG. 8 is a top view of another flexible display panel, a flexible cover plate and a flexible circuit board assembled according to an embodiment of the present disclosure
  • FIG. 9 is a top view of another flexible cover plate provided by an embodiment of the present disclosure.
  • FIG. 10 is a top view of another flexible display panel, flexible cover plate and flexible circuit board assembly provided by an embodiment of the present disclosure
  • FIG. 11 is a structural diagram of a foldable display device provided by an embodiment of the present disclosure.
  • the flexible circuit board is bound to the first side of the flexible display panel, and the area for binding the flexible circuit board in the flexible display panel is not bonded to the flexible cover plate, that is, the folded area of the flexible cover plate has a The part that is bonded to the flexible display panel.
  • the flexible cover is on the inside after folding
  • the part of the flexible cover that is not bonded to the flexible display panel will also be bent, and the flexible cover will be bent after bending.
  • the board is squeezed, causing the flexible cover to not adhere to the flexible display panel and wrinkling at the bent portion.
  • FIG. 1 is a plan view of a foldable display device provided in an embodiment of the present disclosure in a planar state.
  • the foldable display device has a first flat display area 11 , a bendable display area 12 and a second flat display area 13 connected in sequence along the first direction a.
  • the surface of the first plane display area 11, the surface of the bendable display area 12 and the surface of the second plane display area 13 are all in the same plane. Bending the display device in the bendable display area 12 can change the display device from a flat state to a bent state, and at this time, the first flat display area 11 and the second flat display area 13 are opposite to each other.
  • the foldable display device provided by the embodiment of the present disclosure may be an inward-folding foldable display device.
  • FIG. 2 is a side view of the foldable display device provided by the embodiment of the present disclosure in a folded state.
  • the foldable display device includes a laminated flexible display panel 10 and a flexible cover 20 .
  • the flexible cover plate 20 is on the inner side of the bending, so that the flexible cover plate 20 is subjected to bending pressure, and the material of the flexible cover plate 20 is relatively soft, which is prone to wrinkles when subjected to pressure. .
  • the foldable display device may be an outward-folding foldable display device, and when the outward-folding foldable display device is in a folded state, the flexible cover plate is on the outside of the bend.
  • FIG. 3 is a schematic cross-sectional view of the A-A plane in FIG. 1 .
  • the foldable display device includes a flexible display panel 10 , a flexible cover plate 20 and a flexible circuit board 30 .
  • the flexible display panel 10 has a first foldable region 101 and a first side edge 104 , the first foldable region 101 includes a first sub-region 103 , and a portion of the first side edge 104 is a boundary of the first sub-region 103 .
  • the flexible cover plate 20 is bonded to the first surface 102 of the flexible display panel 10 , the flexible cover plate 20 has a second foldable area 201 , and the orthographic projection of the second foldable area 201 on the first surface 102 is located in the first foldable area 101 Inside, the second foldable area 201 is bonded to the first foldable area 101 , and the orthographic projection of the second foldable area 201 on the first surface 102 does not coincide with the first sub-area 103 .
  • the flexible circuit board 30 is bound to the first side 104 of the flexible display panel 10 , and the orthographic projection of the flexible circuit board 30 on the first surface 102 does not coincide with the second foldable area 201 .
  • the orthographic projection of the first sub-region of the first foldable region and the second foldable region on the first surface do not overlap, the orthographic projection of the flexible circuit board on the first surface and the second foldable region not coincident. That is, the second foldable area of the flexible cover plate is retracted inwardly, so that the second foldable area of the flexible cover plate is all bonded to the first foldable area.
  • the folded area of the flexible cover plate will be affected by the adhesive force, and no wrinkles will be generated due to bending, which improves the problem of wrinkles generated when the flexible cover plate is bent.
  • the orthographic projection of the flexible circuit board 30 on the first surface 102 does not coincide with the first foldable area 101 , that is, the flexible circuit board 30 is not bound to the bent part of the flexible display panel 10 to avoid flexibility
  • the circuit board 30 is damaged during bending.
  • the flexible cover 20 may be separated from the flexible display panel 10 due to wrinkles generated when the flexible cover 20 is bent.
  • the problem of wrinkles generated during folding can also effectively improve the problem of separation between the flexible cover plate 20 and the flexible display panel 10 .
  • FIG. 4 is a top view of a flexible display panel provided by an embodiment of the present disclosure.
  • the first foldable area 101 is rectangular, and the boundary of the first sub-area 103 is a part of the first side 104 .
  • the flexible display panel 10 also has a first plane area 106 and a second plane area 107 , and the first plane area 106 and the second plane area 107 are respectively located on two sides of the first foldable area 101 along the first direction a.
  • the first foldable area 101 is opposite to the foldable display area 12 .
  • the first plane area 106 is opposite to the first plane display area 11
  • the second plane area 107 is opposite to the second plane display area 13 .
  • the first foldable area 101 further includes a third sub-area 108 .
  • the third sub-region 108 and the first sub-region 103 form the first foldable region 101 .
  • the orthographic projection of the second foldable region 201 coincides with the third sub-region 108 .
  • the flexible display panel 10 may be a flexible OLED display panel.
  • FIG. 5 is a top view of a flexible cover plate provided by an embodiment of the present disclosure.
  • the flexible cover plate 20 further has a third plane area 204 and a fourth plane area 205 , and along the first direction a, the third plane area 204 and the fourth plane area 205 are respectively located on both sides of the second foldable area 201 .
  • the second foldable area 201 is opposite to the foldable display area 12
  • the third flat area 204 is opposite to the first flat display area 11
  • the fourth flat area 205 is opposite to the second flat display area 13 .
  • the flexible cover plate 20 may be a polyimide (Polyimide, PI) cover plate or a transparent polyimide (Colorless Polyimide, CPI) cover plate, so as to ensure the flexibility and transparency of the flexible cover plate 20 .
  • the edge of the flexible cover plate 20 has a notch 202 , and the notch 202 is located in the extending direction b of the second foldable area 201 , so that the flexible cover plate 20 is in a “concave” shape.
  • the shape of the second foldable region 201 is a rectangle
  • the shape of the gap 202 is a rectangle with rounded corners
  • one side of the second foldable region 201 is a part of one side of the gap 202 .
  • the flexible circuit board 30 includes two first parts 301 .
  • the two first parts 301 are respectively located on both sides of the first foldable area 101 , and on the first surface 102 , the two first parts 301 are The projection at least partially coincides with the orthographic projection of the portion of the flexible cover plate 20 located on both sides of the notch 202 .
  • the flexible cover plate 20 When the flexible cover plate 20 is bent, the flexible cover plate 20 will be subjected to a large bending pressure in the second foldable region 201. Therefore, the flexible cover plate 20 needs to be bonded to the flexible display panel 10, so that due to the bending pressure The flexible cover 20 is wrinkled. However, the bending pressure of the flexible cover plate 20 in the third plane area 204 and the fourth plane area 205 is very small and can be ignored. Therefore, the flexible cover plate 20 generally does not have wrinkles in the third plane area 204 and the fourth plane area 205 .
  • the part of the flexible cover plate 20 in the second foldable area 201 is retracted, so that all the second foldable area 201 of the flexible cover plate 20 is bonded to the flexible display panel 10, which not only ensures that the flexible cover When the 20 is bent, no wrinkles are generated.
  • the flexible cover 20 has a larger area and can protect the surface of the flexible display panel 10 .
  • the orthographic projection of the flexible circuit board 30 and the orthographic projection of the flexible cover plate 20 are partially overlapped, so the flexible circuit board 30 can be shielded in the third plane area 204 and the fourth plane area 205 of the flexible cover plate 20, and the flexible circuit board 30 and the flexible display panel 10 for protection.
  • the flexible circuit board 30 includes at least two circuit boards, and in the first direction a, the at least two circuit boards are respectively located on both sides of the first foldable area 101 and located in the first foldable area All circuit boards on one side of 101 are one first part 301 , and all circuit boards on the other side of the first foldable area 101 are another first part 301 .
  • the flexible circuit board 30 includes a circuit board.
  • the circuit board is in the shape of a "Y" shape.
  • the Y-shaped circuit board has two branches, and one end of the two branches is respectively connected to the flexible display panel. 10 is bound, the other ends of the two branches are connected, and the two branches of the flexible circuit board 30 are respectively two first parts 301 .
  • the width L1 of the notch 202 is greater than the width L2 of the second foldable area 201 , and both the width L1 of the notch 202 and the width L2 of the second foldable area 201 are in the extending direction of the first side edge 104 size on .
  • the extending direction of the first side edge 104 is consistent with the first direction a.
  • a part of the two first parts 301 may be located in the gap 202 .
  • the width L1 of the notch 202 may be greater than the width L2 of the second foldable area 201 , so as to prevent the flexible cover 20 from wrinkling or warping at the junction of the notch 202 and the second foldable area 201 .
  • the width L1 of the notch 202 may be equal to the width L2 of the second foldable area 201 , so that the width L1 of the notch 202 is the smallest, and then the area of the flexible cover 20 is the largest, which further improves the flexibility of the flexible cover 20 for flexible display.
  • the protective effect of the surface of the panel 10 on the first surface 102 , the orthographic projections of the two first portions 301 are located inside the orthographic projections of the portions of the flexible cover plate 20 located on both sides of the notch 202 .
  • the difference between the width of the notch 202 and the width of the second foldable region 201 ranges from 0 mm to 5 mm.
  • the notch 202 may be a right-angled rectangle, a trapezoid, or the like.
  • the flexible cover plate 20 shown in FIG. 5 and FIG. 6 has a notch 202 .
  • a flexible circuit board 30 is bound to one side of the flexible display panel 10 .
  • the flexible circuit board 30 may be bound to two or more sides of the flexible display panel 10 .
  • FIG. 7 is a top view of another flexible cover plate provided by an embodiment of the present disclosure.
  • the edge of the flexible cover 20 has two notches 202 , and in the extending direction b of the second foldable area 201 , the two notches 202 are located on two sides of the second foldable area 201 respectively.
  • FIG. 8 is a top view of another flexible display panel, a flexible cover plate and a flexible circuit board assembled according to an embodiment of the present disclosure.
  • the flexible display panel 10 shown in FIG. 8 is the flexible display panel 10 shown in FIG. 4
  • the flexible cover plate 20 shown in FIG. 8 is the flexible cover plate 20 shown in FIG. 7 .
  • the flexible display panel 10 has two first side edges 104
  • the flexible circuit board 30 is bound to the two first side edges 104 .
  • the flexible cover plate 20 shown in FIGS. 5 and 8 has a notch 202 , and the orthographic projection of the flexible circuit board 30 partially coincides with the orthographic projection of the flexible cover plate 20 .
  • the flexible cover plate 20 may not be provided with a gap, and the orthographic projection of the flexible circuit board 30 does not coincide with the orthographic projection of the flexible cover plate 20 .
  • FIG. 9 is a top view of another flexible cover plate provided by an embodiment of the present disclosure.
  • the flexible cover plate 20 has no notch.
  • the size of the second foldable area 201 in the flexible cover 20 shown in FIG. 9 is the same as the size of the second foldable area 201 in the flexible cover 20 shown in FIG.
  • the edges of the four-planar area 205 are retracted so that the edge of the third planar area 204 and the edge of the fourth planar area 205 are flush with the edge of the second foldable area 201 .
  • FIG. 10 is a top view of another flexible display panel, a flexible cover plate and a flexible circuit board assembled according to an embodiment of the present disclosure.
  • the orthographic projection of the flexible circuit board 30 on the first surface 102 does not coincide with the orthographic projection of the flexible cover plate 20 on the first surface 102 .
  • the flexible display panel 10 shown in FIG. 10 is the flexible display panel 10 shown in FIG. 4
  • the flexible cover plate 20 shown in FIG. 10 is the flexible cover plate 20 shown in FIG. 9 .
  • the entire side of the flexible cover plate 20 is retracted, so that the entire surface of the flexible cover plate 20 is bonded to the flexible display panel 10.
  • the flexible cover plate 20 When the flexible cover plate 20 is bent, the flexible cover plate 20 will Under the action of the adhesive force, there will be no wrinkles due to bending.
  • the foldable display device further includes: a casing 40 .
  • the housing 40 includes an annular baffle 401, the annular baffle 401 surrounds the edge of the flexible display panel 10, and the annular baffle 401 and the flexible cover 20 are located on the same side of the flexible display panel 10.
  • the annular baffle 401 and the flexible display panel 10 There is a gap 402 therebetween, the flexible circuit board 30 is located in the gap 402 , and on the first surface 102 , the orthographic projection of the flexible circuit board 30 is located in the orthographic projection of the annular baffle 401 .
  • the casing 40 may be a middle frame or an outer casing or the like of the foldable display device. The portion where the flexible circuit board 30 and the flexible display panel 10 are bound is located in the gap 402 .
  • the flexible cover 20 may not completely cover the flexible circuit board 30 after retracting, a part of the flexible circuit board 30 may be exposed, which affects the appearance of the display device. At the same time, the exposed flexible circuit board 30 is not blocked. part is easily damaged.
  • the housing 40 is arranged, the gap 402 between the annular baffle 401 and the flexible display panel 10 is used to arrange the flexible circuit board 30 , and the orthographic projection of the flexible circuit board 30 is located at the orthographic projection of the annular baffle 401 Inside.
  • the annular baffle 401 can block the flexible circuit board 30 to avoid affecting the appearance of the display device, and at the same time protect the flexible circuit board 30 to reduce the possibility of damage to the flexible circuit board 30 . Since the annular baffle 401 belongs to the casing 40, the material strength is high, and it is not easy to produce wrinkles when it is bent.
  • the casing 40 is a metal casing to ensure the strength of the casing 40 .
  • the casing 40 is also bent, and the metal has certain bending performance and high material strength, and is not easily wrinkled during bending.
  • the casing 40 is a plastic casing, and the density of the plastic is low, which can reduce the weight of the foldable display device.
  • the housing 40 further includes: a bottom plate 404 and a side plate 405 .
  • the bottom plate 404 is opposite to the annular baffle 401 .
  • the side plate 405 is connected between the outer edge of the bottom plate 404 and the outer edge of the annular baffle 401 , the bottom plate 404 and the side plate 405 form an accommodating space 406 , and the flexible display panel 10 is located in the accommodating space 406 .
  • the housing 40 includes a plurality of side plates 405 , and the plurality of side plates 405 are respectively connected with the bottom plate 404 and the side plates 405 .
  • the annular baffle 401 , the bottom plate 404 and the side plate 405 form an accommodating space 406 , and the flexible display panel 10 is located in the accommodating space 406 to protect the sides of the flexible display panel 10 .
  • the side edges of the flexible display panel 10 are prevented from being bumped, causing damage.
  • the surface 206 of the flexible cover plate 20 away from the flexible display panel 10 is flush with the surface 411 of the annular baffle 401 away from the flexible display panel 10 .
  • the surface 411 of the annular baffle 401 is flush with the surface 206 of the flexible cover plate 20, which ensures the flatness of the surface of the foldable display device.
  • the structure of the foldable display device provided by the embodiment of the present disclosure can reduce the thickness of the casing 40 and the thickness of the foldable display device, It is beneficial to the thinning of the foldable display device.
  • the inner edge of the annular baffle 401 is in contact with the edge of the flexible cover plate 20 .
  • the inner edge of the annular baffle 401 is attached to the edge of the flexible cover plate 20 , so that the annular baffle 401 and the flexible cover plate 20 can completely cover the surface of the flexible display panel 10 and improve the visibility of the flexible display panel. 10. The effect of surface protection.
  • the foldable display device further includes: a first glue material layer 50 .
  • the first glue material layer 50 is located between the flexible display panel 10 and the flexible cover plate 20 .
  • the first glue material layer 50 bonds the flexible display panel 10 and the flexible cover plate 20 together.
  • the first adhesive material layer 50 may be an optical adhesive (Optically Clear Adhesive, OCA) layer or a foam adhesive layer.
  • OCA Optically Clear Adhesive
  • the orthographic projection of the first adhesive material layer 50 on the first surface 102 does not overlap with the orthographic projection of the flexible circuit board 30 on the first surface 102 , so as to prevent the first adhesive material layer 50 from covering the flexible circuit board 30 Affects the performance of the flexible circuit board 30 .
  • the edge of the first glue material layer 50 protrudes from the edge of the flexible cover plate 20 , and the first glue material layer 50 and the flexible cover plate 20 form a first step 203 , which is annular.
  • the baffle 401 has a second step 403 matched with the first step 203 .
  • the first adhesive material layer 50 and the flexible cover plate 20 form the first step 203
  • the step surface 231 of the first step 203 is a part of the surface of the first adhesive material layer 50 , which is also viscous.
  • the stepped surface 431 of the step 403 is attached to the stepped surface 231 of the first step 203 , so that the annular baffle 401 is bonded to the flexible display panel 10 and the stability of the casing 40 is increased.
  • the second foldable area 201 of the flexible cover plate 20 is bonded to the flexible cover plate 20 through the first adhesive material layer 50 , and the flexible cover The part of the board 20 opposite to the flexible circuit board 30 is not bonded to the flexible cover board 20 through the first glue material layer 50 . That is, only at the notch 202 , the edge of the first glue material layer 50 protrudes from the edge of the flexible cover plate 20 .
  • the flexible cover plate 20 is bonded to the flexible cover plate 20 through the first glue material layer 50 .
  • the edge of the entire side edge of the first adhesive material layer 50 protrudes from the edge of the flexible cover plate 20 .
  • the width of the step surface 231 of the first step 203 ranges from 0.2 mm to 0.5 mm, and the width of the step surface 231 is perpendicular to the extending direction of the first side 104 and parallel to the first surface 102 . dimension in the direction.
  • the width of the stepped surface 231 of the first step 203 is limited to be 0.2 mm to 0.5 mm, which can ensure that the stepped surface 231 of the first step 203 is bonded to the annular baffle 401 , and at the same time, the first side edge 104 of the flexible display panel 10 is Leave enough area to bond with the flexible circuit board 30 .
  • the foldable display device further includes: a touch panel (Touch Panel, TP) 60 and a touch flexible printed circuit (Touch Flexible Printed Circuit, TFPC) 70 .
  • the touch panel 60 is located between the flexible display panel 10 and the flexible cover 20.
  • the touch panel 60 has a third foldable area 601 and a second side edge 603.
  • the third foldable area 601 includes a second sub-area 602, and the second A portion of the side edge 603 is the boundary of the second sub-region 602 .
  • the orthographic projection of the second foldable area 201 on the first surface 102 is located inside the orthographic projection of the third foldable area 601 on the first surface 102 , and the orthographic projection of the second foldable area 201 on the first surface 102 is the same as the second The orthographic projections of the sub-regions 602 on the first surface 102 do not coincide.
  • the touch flexible circuit board 70 is bound to the second side 603 of the touch panel 60 , and the orthographic projection of the touch flexible circuit board 70 on the first surface 102 is different from the orthographic projection of the third foldable area 601 on the first surface 102 . coincide.
  • the third foldable region 601 and the first foldable region 101 are overlapped, and the second sub-region 602 and the first sub-region 103 are overlapped. But the first foldable area 101 and the first sub-area 103 belong to the flexible display panel 10 .
  • the third foldable area 601 and the second sub-area 602 belong to the touch panel 60 .
  • the touch panel 60 and the touch flexible circuit board 70 are arranged in the foldable display device, so that the foldable display device can realize the touch function.
  • the orthographic projection of the second sub-region 602 of the third foldable region 601 on the first surface 102 does not coincide with the orthographic projection of the second foldable region 201 on the first surface 102, and the touch flexible circuit board 70 is on the first surface
  • the orthographic projection of 102 does not coincide with the orthographic projection of the third foldable area 601 on the first surface 102, that is to say, the folded areas of the flexible cover 20 are all bonded to the touch panel 60, and the folded area of the flexible cover 20
  • the area does not extend into the area where the touch panel 60 is bound to the touch flexible circuit board 70 , and the area where the touch panel 60 is bound to the touch flexible circuit board 70 cannot be bonded to the flexible cover 20 .
  • the folded area of the flexible cover plate 20 will be affected by the adhesive force, and no wrinkles will be generated due to bending, which improves the problem of wrinkles generated when the flexible cover plate 20 is bent.
  • the orthographic projection of the touch flexible circuit board 70 on the first surface 102 does not overlap with the orthographic projection of the third foldable region 601 on the first surface 102 , that is, on the folded portion of the touch panel 60 .
  • the touch flexible circuit board 70 is not bound to avoid damage to the touch flexible circuit board 70 during the bending process.
  • opposite sides of the touch panel 60 are bound to the touch flexible circuit board 70 , thereby increasing the binding area between the touch panel 60 and the touch flexible circuit board 70 .
  • the foldable display device further includes: a second glue material layer 80 .
  • the second adhesive material layer 80 is located between the touch panel 60 and the flexible display panel 10 , the second adhesive material layer 80 bonds the flexible display panel 10 and the touch panel 60 together, and at this time the first adhesive material layer 50 will The touch panel 60 is bonded to the flexible cover 20 .
  • the second adhesive material layer 80 may be an optical adhesive layer or a foam adhesive layer.
  • the orthographic projection of the second adhesive layer 80 on the first surface 102 does not overlap with the orthographic projection of the touch flexible circuit board 70 on the first surface 102 , so as to prevent the second adhesive layer 80 from making the touch flexible
  • the cover of the circuit board 70 affects the performance of the touch flexible circuit board 70 .
  • the edge of the touch panel 60 protrudes from the edge of the second adhesive material layer 80 .
  • opposite sides of the touch panel 60 are bound to the touch flexible circuit board 70 , and the second adhesive material layer 80 is located on the touch panel 60 and the flexible display panel 10 , where the second side 603 is located.
  • the size of the second adhesive material layer 80 is reduced, and a sufficient area is reserved in the touch panel 60 to bind with the touch flexible circuit board 70 to facilitate the binding of the touch panel 60 and the touch flexible circuit board 70 .
  • the foldable display device further includes: a polarizer (Polarizer, POL) 100 .
  • the polarizer 100 is located between the flexible display panel 10 and the second adhesive material layer 80 , and the polarizer 100 is used to change the polarization direction of polarized light to ensure that the foldable display device can display images.
  • the edge of the polarizer 100 protrudes from the edge of the second adhesive material layer 80 on the side where the second side 603 is located, that is, the second adhesive material layer
  • the edge of 80 is indented.
  • the length of the edge of the polarizer 100 protruding from the edge of the second adhesive material layer 80 ranges from 0.2 mm to 0.5 mm, which is convenient for the touch panel 60
  • Binding with the touch flexible circuit board 70 also prevents the edge of the second adhesive material layer 80 from shrinking too much, resulting in too small area of the second adhesive material layer 80 , which affects the bonding between the touch panel 60 and the flexible display panel 10 .
  • the edge of the first glue material layer 50 is not flush with the edge of the flexible cover plate 20
  • the edge of the polarizer 100 is not flush with the edge of the second glue material layer 80 .
  • FIG. 11 is a schematic structural diagram of a foldable display device provided by an embodiment of the present disclosure. Referring to FIG. 11 , the difference between the structure shown in FIG. 11 and FIG. 3 is that the edge of the first adhesive material layer 50 is flush with the edge of the flexible cover plate 20 , and the edge of the polarizer 100 is flush with the edge of the second adhesive material layer 80 flush.
  • the flexible display panel 10 after the flexible display panel 10 , the polarizer 100 , the second adhesive material layer 80 , the touch panel 60 , the first adhesive material layer 50 and the flexible cover plate 20 are laminated together, no flexible circuit is arranged.
  • One side of the board 30 and the touch flexible circuit board 70 can be die-cut to the flexible display panel 10, the polarizer 100, the second adhesive layer 80, the touch panel 60, the first adhesive layer 50 and the flexible cover.
  • the board 20 is cut so that on the side of the foldable display device on which the flexible circuit board 30 and the touch flexible circuit board 70 are not arranged, the edge of the flexible display panel 10, the edge of the polarizer 100, the edge of the second glue material layer 80, the edge of the touch The edge of the control panel 60 , the edge of the first glue material layer 50 and the edge of the flexible cover plate 20 are flush.
  • the flexible display panel 10 further has a second surface 105 , and the second surface 105 and the first surface 102 are opposite surfaces of the flexible display panel 10 .
  • the foldable display device further includes: a support plate 90 .
  • the support board 90 has a third surface 901 and a fourth surface 902 opposite to each other, the third surface 901 is abutted with the second surface 105 , and the flexible circuit board 30 is bent to the fourth surface 902 of the support board 90 .
  • the support plate 90 is arranged to support the flexible display panel 10 to ensure the shape of the foldable display device in a planar state.
  • the support plate 90 has a groove 903 extending from the edge of the fourth surface 902 to the middle of the fourth surface 902 .
  • the foldable display device further includes a driving circuit located on the groove 903, and the flexible circuit board 30 is electrically connected with the driving circuit.
  • the groove 903 extends from the edge of the fourth surface 902 to the middle of the fourth surface 902 to form a third step 904, and the driving circuit is arranged in the groove 903, the flexible circuit board 30 and the touch flexible circuit The portion of the board 70 that is electrically connected to the driving circuit is also located in the groove 903, thereby reducing the thickness of the foldable display device.
  • the support plate 90 is a metal support plate to ensure the support performance and bending performance of the support plate 90 .

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Abstract

本公开是关于一种可折叠显示装置，属于显示领域。可折叠显示装置包括柔性显示面板、柔性盖板和柔性电路板。柔性显示面板具有第一可折叠区域和第一侧边，第一可折叠区域包括第一子区域，第一侧边的一部分为第一子区域的边界。柔性盖板粘接在柔性显示面板的第一表面，柔性盖板具有第二可折叠区域，第二可折叠区域在第一表面的正投影位于第一可折叠区域的内部，第二可折叠区域与第一可折叠区域粘接，且第二可折叠区域在第一表面的正投影与第一子区域不重合。柔性电路板绑定在第一侧边，柔性电路板在第一表面的正投影与第一可折叠区域在第一表面的正投影不重合，改善了柔性盖板在弯折时产生褶皱的问题。

Description

可折叠显示装置
本公开要求于2021年04月30日提交的申请号为202110482748.X、发明名称为“可折叠显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及显示领域，特别涉及一种可折叠显示装置。
背景技术
可折叠显示装置的兴起，使得可折叠显示技术得以快速发展。可折叠显示装置包括柔性显示面板、柔性盖板和柔性电路板(Flexible Printed Circuit，FPC)。柔性盖板粘接在柔性显示面板的表面，对柔性显示面板的表面进行保护。柔性显示面板的第一侧边与柔性电路板绑定，柔性电路板从柔性显示面板的正面弯折至柔性显示面板的背面。柔性盖板会对柔性电路板进行遮挡。
发明内容
本公开实施例提供了一种可折叠显示装置，改善柔性盖板在弯折时产生褶皱的问题。所述技术方案如下：
本公开提供了一种可折叠显示装置，所述可折叠显示装置，包括：柔性显示面板，具有第一可折叠区域和第一侧边，所述第一可折叠区域包括第一子区域，所述第一侧边的一部分为所述第一子区域的边界；柔性盖板，粘接在所述柔性显示面板的第一表面，所述柔性盖板具有第二可折叠区域，所述第二可折叠区域在所述第一表面的正投影位于所述第一可折叠区域的内部，所述第二可折叠区域与所述第一可折叠区域粘接，且所述第二可折叠区域在所述第一表面的正投影与所述第一子区域不重合；柔性电路板，绑定在所述第一侧边，所述柔性电路板在所述第一表面的正投影与所述第二可折叠区域不重合。
在本公开实施例的一种实现方式中，所述柔性盖板的边缘具有缺口，所述缺口位于所述第二可折叠区域的延伸方向上；所述柔性电路板包括两个第一部分，在所述第一侧边的延伸方向上，所述两个第一部分分别位于所述第一可折 叠区域的两侧；在所述第一表面，所述两个第一部分的正投影与所述柔性盖板的位于所述缺口两侧的部分的正投影至少部分重合。
在本公开实施例的一种实现方式中，所述缺口的宽度大于或等于所述第二可折叠区域的宽度，所述缺口的宽度和所述第二可折叠区域的宽度均为在所述第一侧边的延伸方向上的尺寸。
在本公开实施例的一种实现方式中，所述柔性电路板在所述第一表面的正投影与所述柔性盖板在所述第一表面的正投影不重合。
在本公开实施例的一种实现方式中，所述可折叠显示装置还包括：壳体，包括环形挡板，所述环形挡板围绕所述柔性显示面板的边缘，且所述环形挡板和所述柔性盖板位于所述柔性显示面板的同一侧面；所述环形挡板与所述柔性显示面板之间具有间隙，所述柔性电路板位于所述间隙内，在所述第一表面，所述柔性电路板的正投影位于所述环形挡板的正投影内。
在本公开实施例的一种实现方式中，所述柔性盖板远离所述柔性显示面板的表面与所述环形挡板远离所述柔性显示面板的表面平齐。
在本公开实施例的一种实现方式中，所述环形挡板的内边缘与所述柔性盖板的边缘贴合。
在本公开实施例的一种实现方式中，所述可折叠显示装置还包括：第一胶材层，位于所述柔性显示面板和所述柔性盖板之间，所述第一胶材层在所述第一表面的正投影与所述柔性电路板在所述第一表面的正投影不重合，在所述第一侧边所在的一侧，所述第一胶材层的边缘突出所述柔性盖板的边缘，所述第一胶材层与所述柔性盖板形成第一台阶，所述环形挡板具有与所述第一台阶相配合的第二台阶。
在本公开实施例的一种实现方式中，所述第一台阶的台阶面的宽度范围为0.2毫米至0.5毫米，所述台阶面的宽度为在垂直于所述第一侧边的延伸方向且平行于所述第一表面的方向上的尺寸。
在本公开实施例的一种实现方式中，所述壳体还包括：底板，与所述环形挡板相对；侧板，连接在底板的外边缘和环形挡板的外边缘之间，所述环形挡板、所述底板和所述侧板形成容置空间，所述柔性显示面板位于所述容置空间内。
在本公开实施例的一种实现方式中，所述可折叠显示装置还包括：触控面板，位于所述柔性显示面板和所述柔性盖板之间，所述触控面板具有第三可折 叠区域和第二侧边，所述第三可折叠区域包括第二子区域，所述第二侧边的一部分为所述第二子区域的边界；所述第二可折叠区域在所述第一表面的正投影位于所述第三可折叠区域的内部，且所述第二可折叠区域在所述第一表面的正投影与所述第二子区域在所述第一表面的正投影不重合；触控柔性电路板，绑定在所述第二侧边，所述触控柔性电路板在所述第一表面的正投影与所述第三可折叠区域在所述第一表面的正投影不重合。
在本公开实施例的一种实现方式中，所述触控面板的相对两面均与所述触控柔性电路板绑定。
在本公开实施例的一种实现方式中，所述可折叠显示装置还包括：第二胶材层，位于所述触控面板和所述柔性显示面板之间，所述第二胶材层在所述第一表面的正投影与所述触控柔性电路板在所述第一表面的正投影不重合在所述第二侧边所在的一侧，所述柔性显示面板的边缘突出所述第二胶材层的边缘。
在本公开实施例的一种实现方式中，所述柔性显示面板具有第二表面，所述第二表面和所述第一表面为所述支撑板相对的两表面，所述可折叠显示装置还包括：支撑板，具有相对的第三表面和第四表面，所述第三表面与所述第二表面贴合，所述柔性电路板弯折至所述支撑板的第四表面。
在本公开实施例的一种实现方式中，所述支撑板具有凹槽，所述凹槽从所述第四表面的边缘向所述第四表面的中部延伸；所述可折叠显示装置还包括：位于所述凹槽内的驱动电路，所述柔性电路板与驱动电路电连接。
本公开实施例提供的技术方案带来的有益效果至少包括：
在本公开实施例中，由于第一可折叠区域的第一子区域与第二可折叠区域在第一表面的正投影不重合，柔性电路板在第一表面的正投影与第二可折叠区域不重合。也就是说，将柔性盖板的第二可折叠区域内缩，使得柔性盖板的第二可折叠区域均与第一可折叠区域粘接。在柔性盖板弯折时，柔性盖板的折叠区域都会受到粘接力的作用，不会因为弯折而产生褶皱，改善了柔性盖板在弯折时产生褶皱的问题。
附图说明
为了更清楚地说明本公开实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，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是本公开实施例提供的一种可折叠显示装置处于平面状态的俯视图；
图2是本公开实施例提供的一种可折叠显示装置处于弯折状态的侧视图；
图3是图1中A-A面的截面示意图；
图4是本公开实施例提供的一种柔性显示面板的俯视图；
图5是本公开实施例提供的一种柔性盖板的俯视图；
图6是本公开实施例提供的一种柔性显示面板、柔性盖板和柔性电路板装配的俯视图；
图7是本公开实施例提供的另一种柔性盖板的俯视图；
图8是本公开实施例提供的另一种柔性显示面板、柔性盖板和柔性电路板装配的俯视图；
图9是本公开实施例提供的另一种柔性盖板的俯视图；
图10是本公开实施例提供的另一种柔性显示面板、柔性盖板和柔性电路板装配的俯视图；
图11是本公开实施例提供的一种可折叠显示装置的结构图。
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，下面将结合附图对本公开实施方式作进一步地详细描述。
相关技术中柔性电路板绑定在柔性显示面板的第一侧边，在柔性显示面板中用于绑定柔性电路板的区域没有与柔性盖板粘接，也即柔性盖板的折叠区域具有未与柔性显示面板粘接的部分。对于内折式可折叠显示装置(折叠后柔性盖板在内侧)，在可折叠显示装置弯折时，柔性盖板没有与柔性显示面板粘接的部分也会弯折，且弯折后柔性盖板会受到挤压，导致柔性盖板没有与柔性显示面板粘接且弯折的部分在出现褶皱。
图1是本公开实施例提供的一种可折叠显示装置处于平面状态的俯视图。参见图1，可折叠显示装置具有沿第一方向a依次连接的第一平面显示区域11、可弯折显示区域12和第二平面显示区域13。当可折叠显示装置处于平面状态时，第一平面显示区域11的表面、可弯折显示区域12的表面和第二平面显示区域 13的表面均处于同一平面。在可弯折显示区域12将显示装置弯折，可将显示装置从平面状态变为弯折状态，此时第一平面显示区域11和第二平面显示区域13相对。
本公开实施例提供的可折叠显示装置可以为内折式可折叠显示装置，图2是本公开实施例提供的一种可折叠显示装置处于弯折状态的侧视图。参见图2，可折叠显示装置包括层叠的柔性显示面板10和柔性盖板(Cover)20。当内折式可折叠显示装置处于弯折状态时，柔性盖板20处于弯折的内侧，使得柔性盖板20受到弯折压力，柔性盖板20的材质较软，在受到压力时容易产生褶皱。
在其他实现方式中，可折叠显示装置可以为外折式可折叠显示装置，外折式可折叠显示装置在处于折叠状态时，柔性盖板处于弯折的外侧。
图3是图1中A-A面的截面示意图。参见图3，可折叠显示装置包括：柔性显示面板10、柔性盖板20和柔性电路板30。柔性显示面板10具有第一可折叠区域101和第一侧边104，第一可折叠区域101包括第一子区域103，第一侧边104的一部分为第一子区域103的边界。柔性盖板20粘接在柔性显示面板10的第一表面102，柔性盖板20具有第二可折叠区域201，第二可折叠区域201在第一表面102的正投影位于第一可折叠区域101的内部，第二可折叠区域201与第一可折叠区域101粘接，且第二可折叠区域201在第一表面102的正投影与第一子区域103不重合。柔性电路板30绑定在柔性显示面板10的第一侧边104，柔性电路板30在第一表面102的正投影与第二可折叠区域201不重合。
在本公开实施例中，由于第一可折叠区域的第一子区域与第二可折叠区域在第一表面的正投影不重合，柔性电路板在第一表面的正投影与第二可折叠区域不重合。也就是说，将柔性盖板的第二可折叠区域内缩，使得柔性盖板的第二可折叠区域均与第一可折叠区域粘接。在柔性盖板弯折时，柔性盖板的折叠区域都会受到粘接力的作用，不会因为弯折而产生褶皱，改善了柔性盖板在弯折时产生褶皱的问题。
在本公开实施例中，柔性电路板30在第一表面102的正投影与第一可折叠区域101不重合，也即在柔性显示面板10弯折的部分没有绑定柔性电路板30，避免柔性电路板30在弯折的过程中损坏。
在相关技术中，由于柔性盖板20在弯折时产生褶皱，可能会使得柔性盖板20与柔性显示面板10脱离，本公开实施例提供的可折叠显示面板，改善了柔性盖板20在弯折时产生褶皱的问题，也可以有效改善柔性盖板20与柔性显示面 板10脱离的问题。
图4是本公开实施例提供的一种柔性显示面板的俯视图。参见图4，第一可折叠区域101为矩形，第一子区域103的边界是第一侧边104的一部分。柔性显示面板10还具有第一平面区域106和第二平面区域107，沿第一方向a，第一平面区域106和第二平面区域107分别位于第一可折叠区域101的两侧。其中，第一可折叠区域101与可弯折显示区域12相对。第一平面区域106与第一平面显示区域11相对，第二平面区域107与第二平面显示区域13相对。
如图4所示，第一可折叠区域101还包括第三子区域108。第三子区域108与第一子区域103组成第一可折叠区域101。且在第一表面102，第二可折叠区域201的正投影与第三子区域108重合。
在本公开实施例中，柔性显示面板10可以为柔性OLED显示面板。
图5是本公开实施例提供的一种柔性盖板的俯视图。参见图5，柔性盖板20还具有第三平面区域204和第四平面区域205，沿第一方向a，第三平面区域204和第四平面区域205分别位于第二可折叠区域201的两侧。其中，第二可折叠区域201与可弯折显示区域12相对，第三平面区域204与第一平面显示区域11相对，第四平面区域205与第二平面显示区域13相对。
在本公开实施例中，柔性盖板20可以为聚酰亚胺(Polyimide，PI)盖板或透明聚酰亚胺(Colorless Polyimide，CPI)盖板，保证柔性盖板20的柔性和透明性。
再次参见图5，柔性盖板20的边缘具有缺口202，缺口202位于第二可折叠区域201的延伸方向b上，使得柔性盖板20呈“凹”字形。在图5中，第二可折叠区域201的形状为矩形，缺口202的形状为圆角矩形，第二可折叠区域201的一条边是缺口202的一条边的一部分。将缺口202的形状布置为圆角矩形，可以减小缺口202的边缘应力集中的现象。
图6是本公开实施例提供的一种柔性显示面板、柔性盖板和柔性电路板装配的俯视图。其中，图6所示的柔性显示面板10是图4所示的柔性显示面板10，图6所示的柔性盖板20是图5所示的柔性盖板20。参见图6，柔性电路板30包括两个第一部分301，在第一方向a，两个第一部分301分别位于第一可折叠区域101的两侧，在第一表面102，两个第一部分301正投影与柔性盖板20的位于缺口202两侧的部分的正投影至少部分重合。
在柔性盖板20弯折时，柔性盖板20在第二可折叠区域201会受到较大弯 折压力，因此，柔性盖板20需要粘接在柔性显示面板10上，从而由于弯折压力使得柔性盖板20产生褶皱。而柔性盖板20在第三平面区域204和第四平面区域205受到弯折压力很小，可以忽略不计。所以，柔性盖板20在第三平面区域204和第四平面区域205一般不会产生褶皱。
在本公开实施中，将柔性盖板20在第二可折叠区域201的部分内缩，使得柔性盖板20的第二可折叠区域201全部与柔性显示面板10粘接，既保证在柔性盖板20弯折时不会产生褶皱，相较于将柔性盖板20的整个侧边均内缩，又保证柔性盖板20的面积较大，能够对柔性显示面板10的表面进行保护。同时柔性电路板30的正投影与柔性盖板20的正投影部分重合，那么在柔性盖板20的第三平面区域204和第四平面区域205可以对柔性电路板30进行遮挡，对柔性电路板30和柔性显示面板10进行保护。
在一种可能的实现方式中，柔性电路板30包括至少两个电路板，在第一方向a上，至少两个电路板分别位于第一可折叠区域101的两侧，位于第一可折叠区域101一侧的所有电路板为一个第一部分301，位于第一可折叠区域101另一侧的所有电路板为另一个第一部分301。在另一种可能的实现方式中，柔性电路板30包括一个电路板，例如，电路板的形状为“Y”形，Y形电路板具有两个分支，两个分支的一端分别与柔性显示面板10绑定，两个分支的另一端相连，柔性电路板30的两个分支分别为两个第一部分301。
再次参见图5和图6，缺口202的宽度L1大于第二可折叠区域201的宽度L2，缺口202的宽度L1和第二可折叠区域201的宽度L2均为在第一侧边104的延伸方向上的尺寸。第一侧边104的延伸方向与第一方向a一致。此时，两个第一部分301可能存在一部分位于缺口202内。
在本公开实施例中，缺口202的宽度L1可大于第二可折叠区域201的宽度L2，避免柔性盖板20在缺口202与第二可折叠区域201的交界处褶皱或翘起。
在其他实现方式中，缺口202的宽度L1可以等于第二可折叠区域201的宽度L2，使得缺口202的宽度L1最小，那么柔性盖板20的面积就最大，进一步提高柔性盖板20对柔性显示面板10的表面的保护效果。此时，在第一表面102，两个第一部分301正投影位于柔性盖板20的位于缺口202两侧的部分的正投影的内部。
示例性地，缺口202的宽度与第二可折叠区域201的宽度的差值范围为0毫米至5毫米。
在本公开实施例中，缺口202可以为直角矩形或梯形等。
图5和图6所示的柔性盖板20具有一个缺口202，在图6中柔性显示面板10的一个侧边绑定有柔性电路板30。其他实现方式中，柔性显示面板10的两个侧边或多个侧边均可以绑定柔性电路板30。
图7是本公开实施例提供的另一种柔性盖板的俯视图。参见图7，柔性盖板20的边缘具有两个缺口202，在第二可折叠区域201的延伸方向b上，两个缺口202分别位于第二可折叠区域201的两侧。
图8是本公开实施例提供的另一种柔性显示面板、柔性盖板和柔性电路板装配的俯视图。其中，图8所示的柔性显示面板10是图4所示的柔性显示面板10，图8所示的柔性盖板20是图7所示的柔性盖板20。参见图8，柔性显示面板10具有两条第一侧边104，两条第一侧边104上均绑定有柔性电路板30。
图5和图8所示的柔性盖板20具有缺口202，且柔性电路板30的正投影与柔性盖板20的正投影部分重合。其他实现方式中，柔性盖板20可以不布置缺口，柔性电路板30的正投影与柔性盖板20的正投影不重合。
图9是本公开实施例提供的另一种柔性盖板的俯视图。参见图9，柔性盖板20没有缺口。且图9所示的柔性盖板20中第二可折叠区域201的尺寸与图5所示的柔性盖板20中第二可折叠区域201的尺寸相同，将第三平面区域204的边缘和第四平面区域205的边缘内缩，使第三平面区域204的边缘和第四平面区域205的边缘与第二可折叠区域201的边缘平齐。
图10是本公开实施例提供的另一种柔性显示面板、柔性盖板和柔性电路板装配的俯视图。参见图10，柔性电路板30在第一表面102的正投影与柔性盖板20在第一表面102的正投影不重合。其中，图10所示的柔性显示面板10是图4所示的柔性显示面板10，图10所示的柔性盖板20是图9所示的柔性盖板20。
在本公开实施例中，将柔性盖板20的整个侧边都内缩，使得柔性盖板20的整个表面均与柔性显示面板10粘接，在柔性盖板20弯折时，柔性盖板20都会受到粘接力的作用，不会因为弯折而产生褶皱。
再次参见图3，可折叠显示装置还包括：壳体40。壳体40包括环形挡板401，环形挡板401围绕柔性显示面板10的边缘，且环形挡板401和柔性盖板20位于柔性显示面板10的同一侧面，环形挡板401与柔性显示面板10之间具有间隙402，柔性电路板30位于间隙402内，在第一表面102，柔性电路板30的正投影位于环形挡板401的正投影内。壳体40可以是可折叠显示装置的中框或外 壳等。其中，柔性电路板30与柔性显示面板10绑定的部分位于间隙402内。
由于柔性盖板20内缩后可能无法完全遮挡柔性电路板30，可能会使得柔性电路板30的一部分露出，影响显示装置的美观，同时露出的柔性电路板30没有被遮挡，相较于被遮挡的部分容易损坏。在本公开实施例中，布置壳体40，环形挡板401与柔性显示面板10之间的间隙402用于布置柔性电路板30，且柔性电路板30的正投影位于环形挡板401的正投影内。使得环形挡板401能够将柔性电路板30挡住，避免影响显示装置的美观，同时对柔性电路板30进行保护，减小柔性电路板30损坏的可能性。由于环形挡板401属于壳体40，材质强度较高，在弯折时不易产生褶皱。
在本公开实施例中，壳体40为金属壳体，保证壳体40的强度。在可折叠显示装置弯折时，壳体40也会弯折，金属具有一定的弯折性能并且材质强度较高，在弯折时不易产生褶皱。
可选地，在其他实现方式中，壳体40为塑料壳体，塑料的密度小，可以降低可折叠显示装置的重量。
再次参见图3，壳体40还包括：底板404和侧板405。底板404与环形挡板401相对。侧板405连接在底板404的外边缘和环形挡板401的外边缘之间，底板404和侧板405形成容置空间406，柔性显示面板10位于容置空间406内。通常壳体40包括多块侧板405，多块侧板405分别与底板404和侧板405连接。
在本公开实施例中，环形挡板401、底板404和侧板405形成了一个容置空间406，将柔性显示面板10位于容置空间406内，可对柔性显示面板10的侧边进行保护，避免柔性显示面板10的侧边磕碰，造成损坏。
再次参见图3，柔性盖板20远离柔性显示面板10的表面206与环形挡板401远离柔性显示面板10的表面411平齐。
在本公开实施例中，环形挡板401的表面411与柔性盖板20的表面206平齐，保证了可折叠显示装置表面的平整性。同时相比较相关技术中，将环形挡板401布置在柔性盖板20上，本公开实施例提供的可折叠显示装置的结构可以降低壳体40的厚度，也降低了可折叠显示装置的厚度，有利于可折叠显示装置的轻薄化。
再次参见图3，环形挡板401的内边缘与柔性盖板20的边缘贴合。
在本公开实施例中，环形挡板401的内边缘与柔性盖板20的边缘贴合，使得环形挡板401和柔性盖板20能够将柔性显示面板10的表面完全覆盖，提高 对柔性显示面板10的表面保护的效果。
再次参见图3，可折叠显示装置还包括：第一胶材层50。第一胶材层50位于柔性显示面板10和柔性盖板20之间。第一胶材层50将柔性显示面板10和柔性盖板20粘接在一起。
示例性地，第一胶材层50可以为光学胶(Optically Clear Adhesive，OCA)层或泡棉胶层。
在本公开实施例中，第一胶材层50在第一表面102的正投影与柔性电路板30在第一表面102的正投影不重合，避免第一胶材层50将柔性电路板30覆盖影响柔性电路板30的性能。
再次参见图3，在第一侧边104所在的一侧，第一胶材层50的边缘突出柔性盖板20的边缘，第一胶材层50与柔性盖板20形成第一台阶203，环形挡板401具有与第一台阶203相配合的第二台阶403。
在本公开实施例中，第一胶材层50与柔性盖板20形成第一台阶203，那么第一台阶203的台阶面231就是第一胶材层50表面的一部分，也具有粘性，第二台阶403的台阶面431与第一台阶203的台阶面231贴合，从而将环形挡板401与柔性显示面板10粘接，增加壳体40的稳固性。
在本公开实施例中，对于图5和图6所示的柔性盖板20，柔性盖板20的第二可折叠区域201均通过第一胶材层50与柔性盖板20粘接，柔性盖板20与柔性电路板30相对的部分没有通过第一胶材层50与柔性盖板20粘接。也即，仅在缺口202处，第一胶材层50的边缘突出柔性盖板20的边缘。
对于图9和图10所示的柔性盖板20，柔性盖板20均通过第一胶材层50与柔性盖板20粘接。在第一侧边104所在的一侧，第一胶材层50的整个侧边的边缘均突出柔性盖板20的边缘。
在本公开实施例中，第一台阶203的台阶面231的宽度范围为0.2毫米至0.5毫米，台阶面231的宽度为在垂直于第一侧边104的延伸方向且平行于第一表面102的方向上的尺寸。
限定第一台阶203的台阶面231的宽度范围为0.2毫米至0.5毫米，既能保证第一台阶203的台阶面231与环形挡板401粘接，同时在柔性显示面板10的第一侧边104留出足够的区域与柔性电路板30绑定。
再次参见图3，可折叠显示装置还包括：触控面板(Touch Panel，TP)60和触控柔性电路板(Touch Flexible Printed Circuit，TFPC)70。触控面板60位 于柔性显示面板10和柔性盖板20之间，触控面板60具有第三可折叠区域601和第二侧边603，第三可折叠区域601包括第二子区域602，第二侧边603的一部分为第二子区域602的边界。第二可折叠区域201在第一表面102的正投影位于第三可折叠区域601在第一表面102的正投影的内部，且第二可折叠区域201在第一表面102的正投影与第二子区域602在第一表面102的正投影不重合。触控柔性电路板70绑定在触控面板60的第二侧边603，触控柔性电路板70在第一表面102的正投影与第三可折叠区域601在第一表面102的正投影不重合。
需要说明的是，在图3的截面图中，第三可折叠区域601与第一可折叠区域101是重合的，第二子区域602与第一子区域103是重合的。但是第一可折叠区域101和第一子区域103属于柔性显示面板10。第三可折叠区域601和第二子区域602属于触控面板60。
在可折叠显示装置中布置触控面板60和触控柔性电路板70，使得可折叠显示装置可以实现触控功能。
同时，第三可折叠区域601的第二子区域602在第一表面102的正投影与第二可折叠区域201在第一表面102的正投影不重合，触控柔性电路板70在第一表面102的正投影与第三可折叠区域601在第一表面102的正投影不重合，也就是说柔性盖板20的折叠区域都是粘接在触控面板60上的，柔性盖板20的折叠区域没有延伸到触控面板60绑定触控柔性电路板70的区域内，触控面板60绑定触控柔性电路板70的区域不能和柔性盖板20粘接。柔性盖板20弯折时，柔性盖板20的折叠的区域都会受到粘接力的作用，不会因为弯折而产生褶皱，改善了柔性盖板20在弯折时产生褶皱的问题。
在本公开实施例中，触控柔性电路板70在第一表面102的正投影与第三可折叠区域601在第一表面102的正投影不重合，也即在触控面板60的折叠的部分没有绑定触控柔性电路板70，避免触控柔性电路板70在弯折的过程中损坏。
再次参见图3，触控面板60的相对两面均与触控柔性电路板70绑定，增加触控面板60与触控柔性电路板70的绑定面积。
再次参见图3，可折叠显示装置还包括：第二胶材层80。第二胶材层80位于触控面板60和柔性显示面板10之间，第二胶材层80将柔性显示面板10和触控面板60粘接在一起，且此时第一胶材层50将触控面板60与柔性盖板20粘接起来。
示例性地，第二胶材层80可以为光学胶层或泡棉胶层。
在本公开实施例中，第二胶材层80在第一表面102的正投影与触控柔性电路板70在第一表面102的正投影不重合，避免第二胶材层80将触控柔性电路板70覆盖影响触控柔性电路板70的性能。
再次参见图3，在第二侧边603，触控面板60的边缘突出第二胶材层80的边缘。
在本公开实施例中，触控面板60的相对两面均与触控柔性电路板70绑定，且第二胶材层80位于触控面板60和柔性显示面板10，在第二侧边603所在的一侧，减小第二胶材层80的尺寸，在触控面板60中留出足够的区域与触控柔性电路板70绑定，方便触控面板60与触控柔性电路板70绑定。
再次参见图3，可折叠显示装置还包括：偏光片(Polarizer，POL)100。偏光片100位于柔性显示面板10和第二胶材层80之间，偏光片100用于改变偏振光的偏振方向，保证可折叠显示装置能够显示画面。
如图3所示，由于第二胶材层80内缩，使得在第二侧边603所在的一侧，偏光片100的边缘突出第二胶材层80的边缘，也即将第二胶材层80的边缘内缩。
在本公开实施例中，在第二可折叠区域201的延伸方向b上，偏光片100的边缘突出第二胶材层80的边缘的长度范围为0.2毫米至0.5毫米，既方便触控面板60与触控柔性电路板70绑定，又避免第二胶材层80的边缘内缩太多，导致第二胶材层80面积太小，影响触控面板60和柔性显示面板10的粘接。
再次参见图3，在第二可折叠区域201的延伸方向b上，柔性电路板30与偏光片100之间具间隙，为制作公差。
图3所示的膜层图中，第一胶材层50的边缘与柔性盖板20的边缘不平齐，偏光片100的边缘与第二胶材层80的边缘不平齐。
图11是本公开实施例提供的一种可折叠显示装置的结构示意图。参见图11，图11中所示的结构与图3的区别在于，第一胶材层50的边缘与柔性盖板20的边缘平齐，偏光片100的边缘与第二胶材层80的边缘平齐。
在本公开实施例中，将柔性显示面板10、偏光片100、第二胶材层80、触控面板60、第一胶材层50和柔性盖板20贴合起来后，在没有布置柔性电路板30和触控柔性电路板70的一侧，可以采用模切的方式对柔性显示面板10、偏光片100、第二胶材层80、触控面板60、第一胶材层50和柔性盖板20切割，使得在可折叠显示装置没有布置柔性电路板30和触控柔性电路板70的一侧， 柔性显示面板10的边缘、偏光片100的边缘、第二胶材层80的边缘、触控面板60的边缘、第一胶材层50的边缘和柔性盖板20的边缘平齐。
再次参见图3和图11，柔性显示面板10还具有第二表面105，第二表面105和第一表面102为柔性显示面板10相对的两表面，可折叠显示装置还包括：支撑板90。支撑板90具有相对的第三表面901和第四表面902，第三表面901与第二表面105贴合，柔性电路板30弯折至支撑板90的第四表面902。
在本公开实施例中，布置支撑板90对柔性显示面板10进行支撑，保证可折叠显示装置在平面状态下的形态。
再次参见图3和图11，支撑板90具有凹槽903，凹槽903从第四表面902的边缘向第四表面902的中部延伸。可折叠显示装置还包括位于凹槽903上的驱动电路，柔性电路板30与驱动电路电连接。
在本公开实施例中，凹槽903从第四表面902的边缘向第四表面902的中部延伸形成第三台阶904，将驱动电路布置在凹槽903内，柔性电路板30和触控柔性电路板70与驱动电路电连接的部分也位于凹槽903内，从而降低可折叠显示装置的厚度。
示例性地，支撑板90为金属支撑板，保证支撑板90的支撑性能和弯折性能。
以上所述仅为本公开的可选实施例，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (15)

  1. 一种可折叠显示装置，其特征在于，所述可折叠显示装置，包括：
    柔性显示面板(10)，具有第一可折叠区域(101)和第一侧边(104)，所述第一可折叠区域(101)包括第一子区域(103)，所述第一侧边(104)的一部分为所述第一子区域(103)的边界；
    柔性盖板(20)，粘接在所述柔性显示面板(10)的第一表面(102)，所述柔性盖板(20)具有第二可折叠区域(201)，所述第二可折叠区域(201)在所述第一表面(102)的正投影位于所述第一可折叠区域(101)的内部，所述第二可折叠区域(201)与所述第一可折叠区域(101)粘接，且所述第二可折叠区域(201)在所述第一表面(102)的正投影与所述第一子区域(103)不重合；
    柔性电路板(30)，绑定在所述第一侧边(104)，所述柔性电路板(30)在所述第一表面(102)的正投影与所述第二可折叠区域(201)不重合。
  2. 根据权利要求1所述的可折叠显示装置，其特征在于，所述柔性盖板(20)的边缘具有缺口(202)，所述缺口(202)位于所述第二可折叠区域(201)的延伸方向上；
    所述柔性电路板(30)包括两个第一部分(301)，在所述第一侧边(104)的延伸方向上，所述两个第一部分(301)分别位于所述第一可折叠区域(101)的两侧；
    在所述第一表面(102)，所述两个第一部分(301)的正投影与所述柔性盖板(20)的位于所述缺口(202)两侧的部分的正投影至少部分重合。
  3. 根据权利要求2所述的可折叠显示装置，其特征在于，所述缺口(202)的宽度大于或等于所述第二可折叠区域(201)的宽度，所述缺口(202)的宽度和所述第二可折叠区域(201)的宽度均为在所述第一侧边(104)的延伸方向上的尺寸。
  4. 根据权利要求1所述的可折叠显示装置，其特征在于，所述柔性电路板(30)在所述第一表面(102)的正投影与所述柔性盖板(20)在所述第一表面(102)的正投影不重合。
  5. 根据权利要求1至4任一项所述的可折叠显示装置，其特征在于，所述可折叠显示装置还包括：
    壳体(40)，包括环形挡板(401)，所述环形挡板(401)围绕所述柔性显 示面板(10)的边缘，且所述环形挡板(401)和所述柔性盖板(20)位于所述柔性显示面板(10)的同一侧面；
    所述环形挡板(401)与所述柔性显示面板(10)之间具有间隙(402)，所述柔性电路板(30)位于所述间隙(402)内，在所述第一表面(102)，所述柔性电路板(30)的正投影位于所述环形挡板(401)的正投影内。
  6. 根据权利要求5所述的可折叠显示装置，其特征在于，所述柔性盖板(20)远离所述柔性显示面板(10)的表面(206)与所述环形挡板(401)远离所述柔性显示面板(10)的表面(411)平齐。
  7. 根据权利要求5所述的可折叠显示装置，其特征在于，所述环形挡板(401)的内边缘与所述柔性盖板(20)的边缘贴合。
  8. 根据权利要求5所述的可折叠显示装置，其特征在于，所述可折叠显示装置还包括：
    第一胶材层(50)，位于所述柔性显示面板(10)和所述柔性盖板(20)之间，所述第一胶材层(50)在所述第一表面(102)的正投影与所述柔性电路板(30)在所述第一表面(102)的正投影不重合，在所述第一侧边(104)所在的一侧，所述第一胶材层(50)的边缘突出所述柔性盖板(20)的边缘，所述第一胶材层(50)与所述柔性盖板(20)形成第一台阶(203)，所述环形挡板(401)具有与所述第一台阶(203)相配合的第二台阶(403)。
  9. 根据权利要求8所述的可折叠显示装置，其特征在于，所述第一台阶(203)的台阶面(231)的宽度范围为0.2毫米至0.5毫米，所述台阶面(231)的宽度为在垂直于所述第一侧边(104)的延伸方向且平行于所述第一表面(102)的方向上的尺寸。
  10. 根据权利要求5所述的可折叠显示装置，其特征在于，所述壳体(40)还包括：
    底板(404)，与所述环形挡板(401)相对；
    侧板(405)，连接在所述底板(404)的外边缘和所述环形挡板(401)的外边缘之间，所述环形挡板(401)、所述底板(404)和所述侧板(405)形成容置空间(406)，所述柔性显示面板(10)位于所述容置空间(406)内。
  11. 根据权利要求1至4任一项或6至9任一项所述的可折叠显示装置，其特征在于，所述可折叠显示装置还包括：
    触控面板(60)，位于所述柔性显示面板(10)和所述柔性盖板(20)之间，所述触控面板(60)具有第三可折叠区域(601)和第二侧边(603)，所述第三可折叠区域(601)包括第二子区域(602)，所述第二侧边(603)的一部分为所述第二子区域(602)的边界；所述第二可折叠区域(201)在所述第一表面(102)的正投影位于所述第三可折叠区域(601)在所述第一表面(102)的正投影的内部，且所述第二可折叠区域(201)在所述第一表面(102)的正投影与所述第二子区域(602)在所述第一表面(102)的正投影不重合；
    触控柔性电路板(70)，绑定在所述第二侧边(603)，所述触控柔性电路板(70)在所述第一表面(102)的正投影与所述第三可折叠区域(601)在所述第一表面(102)的正投影不重合。
  12. 根据权利要求11所述的可折叠显示装置，其特征在于，所述触控面板(60)的相对两面均与所述触控柔性电路板(70)绑定。
  13. 根据权利要求12所述的可折叠显示装置，其特征在于，所述可折叠显示装置还包括：
    第二胶材层(80)，位于所述触控面板(60)和所述柔性显示面板(10)之间，所述第二胶材层(80)在所述第一表面(102)的正投影与所述触控柔性电路板(70)在所述第一表面(102)的正投影不重合，在所述第二侧边(603)所在的一侧，所述触控面板(60)的边缘突出所述第二胶材层(80)的边缘。
  14. 根据权利要求1至4任一项或6至9任一项所述的可折叠显示装置，其特征在于，所述柔性显示面板(10)还具有第二表面(105)，所述第二表面(105)和所述第一表面(102)为所述柔性显示面板(10)相对的两表面，所述可折叠显示装置还包括：
    支撑板(90)，具有相对的第三表面(901)和第四表面(902)，所述第三表面(901)与所述第二表面(105)贴合，所述柔性电路板(30)弯折至所述支撑板(90)的第四表面(902)。
  15. 根据权利要求14所述的可折叠显示装置，其特征在于，所述支撑板(90)具有凹槽(903)，所述凹槽(903)从所述第四表面(902)的边缘向所述第四表面(902)的中部延伸；
    所述可折叠显示装置还包括：
    位于所述凹槽(903)内的驱动电路，所述柔性电路板(30)与驱动电路电 连接。
PCT/CN2021/129219 2021-04-30 2021-11-08 可折叠显示装置 WO2022227479A1 (zh)

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