Display module and display terminal

Abstract

Embodiments of the present application disclose a display module and a display terminal. The display module comprises a display panel and a cover plate, the cover plate having a curved bonding surface facing the display panel, a portion of the curved bonding surface being attached to a display side of the display panel by means of a transparent adhesive, and the curved bonding surface completely covering a display main body and a bending part. The bending part comprises a wire, and at least one groove is formed in the bending part, the groove extending along a bending direction of the bending part and being located at the outer side of the wire.

Description

Display module and display terminal Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display module and a display terminal. Background Art

[0002] In a display module, on the one hand, the binding portion of the display panel needs to bend to the back of the display panel through a bend portion, at which point the bend portion is subject to bending stress in the vertical bending direction. On the other hand, after a fully curved cover plate is assembled onto the display panel, the bend portion of the display panel is affected by the shape of the fully curved cover plate, causing it to bend along the bend direction of the fully curved cover plate. The bending axes of the bending stresses in the two directions are perpendicular to each other, causing the top of the bend (the elliptical circle) to tilt toward the cover plate CG side (as shown in Figure 1). Because the area with a smaller curvature radius of the fully curved cover plate corresponds to the bend portion, the bending radius at the top of the arc becomes locally smaller, increasing the stress, which in turn can cause the traces at the top of the arc to break. SUMMARY OF THE INVENTION

[0003] Embodiments of the present application provide a display module and a display terminal, which can reduce the risk of wiring breakage at a bent portion of a display panel.

[0004] An embodiment of the present application provides a display module, comprising:

[0005] A display panel, the display panel comprising a display body, a bending portion, and a binding portion connected in sequence, the binding portion being arranged on the back of the display body through the bending portion;

[0006] a cover plate, the cover plate having a bonding curved surface facing the display panel, the bonding curved surface being bonded to the display side of the display panel via a transparent adhesive, the bonding curved surface fully covering the display body and the bent portion;

[0007] The bending portion includes a wiring, and at least one groove is formed on the bending portion. The groove extends along the bending direction of the bending portion and is located outside the wiring.

[0008] Optionally, in some embodiments of the present application, in the long axis direction of the bending portion, the curvature radius of the fitting curved surface is equal, and the plurality of grooves are evenly arranged.

[0009] Optionally, in some embodiments of the present application, in the long axis direction of the bent portion, the bent portion includes a first region and a second region, and the second region is located on an opposite side of the first region;

[0010] The conforming curved surface includes a first curved surface covering the first area and a second curved surface covering the second area, the second curved surface being connected to an opposite side of the first curved surface, and the curvature radii of the first curved surface and the second curved surface being equal in the long axis direction of the bent portion, and the curvature radius of the first curved surface is greater than the curvature radius of the second curved surface;

[0011] In regions with the same arc length, the number of the trenches located in the first region is smaller than the number of the trenches located in the second region.

[0012] Optionally, in some embodiments of the present application, a distance between two adjacent grooves in the first region is greater than a distance between two adjacent grooves in the second region.

[0013] Optionally, in some embodiments of the present application, in the long axis direction of the bent portion, the bent portion includes a first region and a second region, and the second region is located on an opposite side of the first region;

[0014] The conforming curved surface includes a first curved surface covering the first area and a second curved surface covering the second area, wherein the second curved surface is connected to an opposite side of the first curved surface. In the long axis direction of the bent portion, the curvature radius of the first curved surface is equal, and the curvature radius of the second curved surface decreases.

[0015] In regions with the same arc length, the number of the trenches located in the first region is smaller than the number of the trenches located in the second region.

[0016] Optionally, in some embodiments of the present application, in the second region, the density of the grooves increases gradually from the side of the second region connected to the first region to the direction in which the second region moves away from the first region.

[0017] Optionally, in some embodiments of the present application, the display panel includes:

[0018] a flexible substrate, the flexible substrate being arranged in the region of the display body, the bending portion, and the binding portion;

[0019] a thin film transistor structure layer, the thin film transistor structure layer comprising a thin film transistor and an inorganic insulating stack, the thin film transistor being located in the region of the display body, the inorganic insulating stack being disposed at least in the region of the display body and the binding portion, the inorganic insulating stack being provided with a groove, the groove being disposed in the region of the bent portion;

[0020] an organic layer, the organic layer being disposed on the thin film transistor structure layer, the organic layer extending from the area of ​​the display body to cover the area of ​​the bent portion and filling the groove, the wiring being disposed on the organic layer;

[0021] Wherein, in the region of the bent portion, the organic layer is provided with the groove, and the groove at least penetrates a portion of the organic layer.

[0022] Optionally, in some embodiments of the present application, the thin film transistor structure layer includes a light shielding layer, a buffer layer, a first active layer, a first insulating layer, a first metal layer, a second insulating layer, a second metal layer, a first interlayer dielectric layer, a second active layer, a third insulating layer, a third metal layer, a second interlayer dielectric layer, and a fourth metal layer;

[0023] The light shielding layer is arranged on the flexible substrate, the buffer layer is arranged on the light shielding layer and covers the flexible substrate, the first active layer is arranged on the buffer layer, the first insulating layer covers the first active layer and the buffer layer, the first metal layer is arranged on the first insulating layer, the first metal layer includes a first gate overlapping with the first active layer, the second insulating layer covers the first metal layer and the first insulating layer, the second metal layer is arranged on the second insulating layer, the second metal layer includes an electrode plate and a second gate, the electrode plate and the first gate are overlapped to form a capacitor, the second gate is located on one side of the electrode plate, the first interlayer dielectric layer covers the second metal layer and the a second insulating layer, the second active layer is arranged on the first interlayer dielectric layer, the second active layer is overlapped with the second gate electrode, the third insulating layer covers the second active layer and the first interlayer dielectric layer, the third metal layer is arranged on the third insulating layer, the third metal layer includes a third gate electrode overlapped with the second active layer, the second interlayer dielectric layer covers the third metal layer and the third insulating layer, the fourth metal layer is arranged on the second interlayer dielectric layer, the fourth metal layer includes a first source electrode, a first drain electrode, a second source electrode, and a second drain electrode, the first source electrode and the first drain electrode are connected to the first active layer, and the second source electrode and the second drain electrode are connected to the second active layer;

[0024] The buffer layer, the first insulating layer, the second insulating layer, the first interlayer dielectric layer, the third insulating layer and the second interlayer dielectric layer are stacked to form the inorganic insulating stack, and the groove penetrates at least one layer of the inorganic insulating stack.

[0025] Optionally, in some embodiments of the present application, the display panel further includes a protective layer, the protective layer covers the bent portion and extends to cover the display body and a portion of the binding portion, and the groove penetrates the protective layer;

[0026] The display panel further includes a packaging adhesive, and the packaging adhesive is filled in the groove.

[0027] Optionally, in some embodiments of the present application, the display panel includes:

[0028] a flexible substrate, the flexible substrate being arranged in the region of the display body, the bending portion, and the binding portion;

[0029] a thin film transistor structure layer, the thin film transistor structure layer comprising a thin film transistor and an inorganic insulating stack, the thin film transistor being located in the region of the display body, the inorganic insulating stack being disposed in the region of the display body, the bent portion, and the binding portion, the inorganic insulating stack being provided with a plurality of grooves, the grooves being disposed in the region of the bent portion, the plurality of grooves being arranged along the long axis of the bent portion, and the grooves extending along the bending direction of the bent portion; at least one of the source, drain, and gate of the thin film transistor being disposed in the same layer as the trace;

[0030] The groove is filled with an organic material, the organic material is provided with the groove, the depth of the groove is less than the thickness of the organic material, or the groove passes through all film layers of the bending portion.

[0031] Accordingly, an embodiment of the present application further provides a display terminal, which includes the display module as described in any one of the above embodiments.

[0032] For example, the display module includes:

[0033] A display panel, the display panel comprising a display body, a bending portion, and a binding portion connected in sequence, the binding portion being arranged on the back of the display body through the bending portion;

[0034] a cover plate, the cover plate having a bonding curved surface facing the display panel, the bonding curved surface being bonded to the display side of the display panel via a transparent adhesive, the bonding curved surface fully covering the display body and the bent portion;

[0035] The bending portion includes a wiring, and at least one groove is formed on the bending portion. The groove extends along the bending direction of the bending portion and is located outside the wiring.

[0036] Optionally, in some embodiments of the present application, in the long axis direction of the bending portion, the curvature radius of the fitting curved surface is equal, and the plurality of grooves are evenly arranged.

[0037] Optionally, in some embodiments of the present application, in the long axis direction of the bent portion, the bent portion includes a first region and a second region, and the second region is located on an opposite side of the first region;

[0038] The conforming curved surface includes a first curved surface covering the first area and a second curved surface covering the second area, the second curved surface being connected to an opposite side of the first curved surface, and the curvature radii of the first curved surface and the second curved surface being equal in the long axis direction of the bent portion, and the curvature radius of the first curved surface is greater than the curvature radius of the second curved surface;

[0039] In regions with the same arc length, the number of the trenches located in the first region is smaller than the number of the trenches located in the second region.

[0040] Optionally, in some embodiments of the present application, a distance between two adjacent grooves in the first region is greater than a distance between two adjacent grooves in the second region.

[0041] Optionally, in some embodiments of the present application, in the long axis direction of the bent portion, the bent portion includes a first region and a second region, and the second region is located on an opposite side of the first region;

[0042] The conforming curved surface includes a first curved surface covering the first area and a second curved surface covering the second area, wherein the second curved surface is connected to an opposite side of the first curved surface. In the long axis direction of the bent portion, the curvature radius of the first curved surface is equal, and the curvature radius of the second curved surface decreases.

[0043] In regions with the same arc length, the number of the trenches located in the first region is smaller than the number of the trenches located in the second region.

[0044] Optionally, in some embodiments of the present application, in the second region, the density of the grooves increases gradually from the side of the second region connected to the first region to the direction in which the second region moves away from the first region.

[0045] Optionally, in some embodiments of the present application, the display panel includes:

[0046] a flexible substrate, the flexible substrate being arranged in the region of the display body, the bending portion, and the binding portion;

[0047] a thin film transistor structure layer, the thin film transistor structure layer comprising a thin film transistor and an inorganic insulating stack, the thin film transistor being located in the region of the display body, the inorganic insulating stack being disposed at least in the region of the display body and the binding portion, the inorganic insulating stack being provided with a groove, the groove being disposed in the region of the bent portion;

[0048] an organic layer, the organic layer being disposed on the thin film transistor structure layer, the organic layer extending from the area of ​​the display body to cover the area of ​​the bent portion and filling the groove, the wiring being disposed on the organic layer;

[0049] Wherein, in the region of the bent portion, the organic layer is provided with the groove, and the groove at least penetrates a portion of the organic layer.

[0050] Optionally, in some embodiments of the present application, the thin film transistor structure layer includes a light shielding layer, a buffer layer, a first active layer, a first insulating layer, a first metal layer, a second insulating layer, a second metal layer, a first interlayer dielectric layer, a second active layer, a third insulating layer, a third metal layer, a second interlayer dielectric layer, and a fourth metal layer;

[0051] The light shielding layer is arranged on the flexible substrate, the buffer layer is arranged on the light shielding layer and covers the flexible substrate, the first active layer is arranged on the buffer layer, the first insulating layer covers the first active layer and the buffer layer, the first metal layer is arranged on the first insulating layer, the first metal layer includes a first gate overlapping with the first active layer, the second insulating layer covers the first metal layer and the first insulating layer, the second metal layer is arranged on the second insulating layer, the second metal layer includes an electrode plate and a second gate, the electrode plate and the first gate are overlapped to form a capacitor, the second gate is located on one side of the electrode plate, the first interlayer dielectric layer covers the second metal layer and the a second insulating layer, the second active layer is arranged on the first interlayer dielectric layer, the second active layer is overlapped with the second gate electrode, the third insulating layer covers the second active layer and the first interlayer dielectric layer, the third metal layer is arranged on the third insulating layer, the third metal layer includes a third gate electrode overlapped with the second active layer, the second interlayer dielectric layer covers the third metal layer and the third insulating layer, the fourth metal layer is arranged on the second interlayer dielectric layer, the fourth metal layer includes a first source electrode, a first drain electrode, a second source electrode, and a second drain electrode, the first source electrode and the first drain electrode are connected to the first active layer, and the second source electrode and the second drain electrode are connected to the second active layer;

[0052] The buffer layer, the first insulating layer, the second insulating layer, the first interlayer dielectric layer, the third insulating layer and the second interlayer dielectric layer are stacked to form the inorganic insulating stack, and the groove penetrates at least one layer of the inorganic insulating stack. Beneficial effects

[0053] The display module of the embodiment of the present application includes a display panel and a cover plate. The display panel includes a display body, a bending portion and a binding portion connected in sequence, and the binding portion is arranged on the back of the display body through the bending portion; the cover plate has a fitting curved surface facing the display panel, and a portion of the fitting curved surface is fitted to the display side of the display panel through transparent adhesive, and the fitting curved surface fully covers the display body and the bending portion; the bending portion includes a wiring, and at least one groove is opened on the bending portion, and the groove extends along the bending direction of the bending portion and is located on the outside of the wiring.

[0054] The display module of the embodiment of the present application is provided with a groove on the bending portion to release the bending stress on the bending portion, thereby reducing the risk of wiring breakage in the bending portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] FIG1 is a diagram of a display module provided in the related art;

[0056] FIG2 is a bottom-view structural diagram of a display module provided in Example 1 of the present application;

[0057] FIG3 is a schematic cross-sectional view of the structure along line BB in FIG2 ;

[0058] FIG4 is an enlarged view of portion C1 in FIG3 ;

[0059] FIG5 is a schematic cross-sectional view of the structure along line CC in FIG2 ;

[0060] Figure 6 is an enlarged view of part C2 in Figure 5

[0061] 7 is a schematic top view of the structure of the display panel of the display module provided in the first embodiment of the present application in an unfolded state;

[0062] FIG8 is a schematic cross-sectional view of the display panel of the display module provided in the first embodiment of the present application in an unfolded state;

[0063] FIG9 is a bottom view structural diagram of a display module provided in Example 2 of the present application;

[0064] FIG10 is a schematic cross-sectional view taken along line CC in FIG9 ;

[0065] FIG11 is a schematic top view of the structure of the display panel of the display module provided in the second embodiment of the present application in an unfolded state;

[0066] FIG12 is a diagram of a simulation experiment of Comparative Example 1 and Comparative Example 2;

[0067] FIG13 is a bottom-view structural diagram of a display module provided in Example 3 of the present application;

[0068] FIG14 is a schematic cross-sectional view taken along line CC in FIG13 ;

[0069] FIG15 is a schematic top view of the structure of the display panel of the display module provided in the third embodiment of the present application in an unfolded state;

[0070] FIG16 is a schematic cross-sectional structural diagram of the display panel of the display module provided in the fourth embodiment of the present application in an unfolded state.

[0071] In FIG. 1 , BP1 and BP2 are backplanes supporting the display panel. Modes for Carrying Out the Invention

[0072] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device; the terms "first", "second", "third", etc. are used only as labels and do not impose numerical requirements or establish an order.

[0073] The embodiments of the present application provide a display module and a display terminal, which are described in detail below. It should be noted that the order of description of the following embodiments does not limit the preferred order of the embodiments.

[0074] The display module and display terminal of the embodiments of the present application both include a display panel and a cover plate. The display panel includes a display body, a bending portion and a binding portion connected in sequence, and the binding portion is arranged on the back of the display body through the bending portion; the cover plate has a fitting curved surface facing the display panel, and a portion of the fitting curved surface is fitted to the display side of the display panel through transparent adhesive, and the fitting curved surface fully covers the display body and the bending portion; the bending portion includes a wiring, and at least one groove is opened on the bending portion, and the groove extends along the bending direction of the bending portion and is located on the outside of the wiring.

[0075] The display module of the embodiment of the present application is provided with a groove on the bending portion to release the bending stress on the bending portion, thereby reducing the risk of wiring breakage in the bending portion.

[0076] It's important to understand that the bent portion is subject to bending stress in two directions: the first direction in which the bent portion bends toward the back of the display body; the second direction in which the bent portion is affected by the curved surface of the cover plate after the display panel is attached to the cover plate. The grooves can simultaneously relieve bending stress in both directions, with a greater degree of relief and relief for the second direction.

[0077] Among them, the present application can set grooves of different densities according to the regional morphology of different curvature radii of the fitting surface of the cover plate, so that the bending stress on the bent part can be fully released and alleviated.

[0078] Example 1

[0079] 2 to 6 , an embodiment of the present application provides a display module 100 , which includes a display panel 10 and a cover plate 20 .

[0080] The display panel 10 includes a display body 10a, a bent portion 10b, and a binding portion 10c connected in sequence. The binding portion 10c is arranged on the back of the display body 10a through the bent portion 10b. The cover 20 is attached to the display side of the display panel 10 by transparent adhesive 31.

[0081] Optionally, in the film layer stacking structure, the display module 100 may further include a polarizer 32 and a protective layer 33 .

[0082] The polarizer 32 is disposed on the display body 10 a , and the transparent adhesive 31 is disposed on the polarizer 32 .

[0083] The protection layer 33 covers the bent portion 10 b and extends to cover the display body 10 a and the binding portion 10 c.

[0084] Optionally, the groove 12 passes through the protective layer 33. The material of the protective layer 33 can be an adhesive material such as ultraviolet curing adhesive.

[0085] Optionally, the display panel 10 is an organic light emitting display panel (OLED), a quantum dot light emitting display panel (QLED) or a micro inorganic light emitting display panel (u-LED).

[0086] In some embodiments, the polarizer 32 may be replaced by a color filter layer and integrated into the display panel 10 .

[0087] Optionally, the cover plate 20 has a bonding curved surface 20q facing the display panel 10. A portion of the bonding curved surface 20q is bonded to the display side of the display panel 10 via a transparent adhesive 31. The bonding curved surface 20q fully covers the display body 10a and the bent portion 10b.

[0088] The bending portion 10b includes a wiring 11. The bending portion 10b is provided with at least one groove 12. The groove 12 extends along a bending direction W of the bending portion 10b and is located outside the wiring 11.

[0089] The display module 100 of the embodiment of the present application is provided with a groove 12 on the bent portion 10 b to release the bending stress on the bent portion 10 b , thereby reducing the risk of the wiring 11 of the bent portion 10 b being broken.

[0090] 7 , optionally, in the long axis direction N of the bent portion 10 b , the curvature radius of the fitting curved surface 20 q is equal, and the plurality of grooves 12 are evenly arranged.

[0091] Since the fitting surface 20q is a surface with a single curvature radius, the bending portion 10b is relatively evenly affected by the bending stress of the cover plate 20. Therefore, evenly arranged grooves 12 are opened on the bending portion 10b so that the bending stress on the bending portion 10b can be fully released and alleviated.

[0092] The groove 12 and the outer shape of the display panel 10 are formed in the same cutting process.

[0093] The long axis direction N of the bent portion 10 b is parallel to the short side direction of the display module 100 .

[0094] Optionally, the fitting curved surface 20q of the cover plate 20 further extends beyond the display panel 10 .

[0095] Referring to FIG. 8 , optionally, the display panel 10 includes a flexible substrate 101 , a thin film transistor structure layer 102 and an organic layer 103 .

[0096] The flexible substrate 101 is provided in the areas of the display body 10 a , the bending portion 10 b , and the binding portion 10 c .

[0097] The thin-film transistor structure layer 102 includes thin-film transistors (TFTs) and an inorganic insulating layer (DC). The TFTs are located in the display body 10a region. The inorganic insulating layer (DC) is located at least in the display body 10a and the binding portion 10c region. The inorganic insulating layer (DC) has a groove (k1) defined therein. The groove (k1) is located in the bend portion 10b region.

[0098] The organic layer 103 is disposed on the thin film transistor structure layer 102 . The organic layer 103 extends from the display body 10 a to cover the bent portion 10 b and fills the groove k1 . The trace 11 is disposed on the organic layer 103 .

[0099] In the region of the bent portion 10 b , the organic layer 103 is provided with a groove 12 . The groove 12 at least penetrates a portion of the organic layer 103 .

[0100] In this embodiment, the inorganic insulating layer dc is removed from the bend portion 10b and the groove k1 is filled with an organic layer 103. Because the organic layer 103 has stronger stress absorption properties than the inorganic insulating layer dc, this arrangement improves the bending performance of the bend portion 10b and further reduces the risk of breakage of the trace 11. Furthermore, the organic layer 103 is more flexible than the inorganic insulating layer dc. After laser grooving to form the groove 12, the organic layer 103 reduces the risk of film peeling when the bend portion 10b bends in both directions.

[0101] Optionally, the groove 12 further extends through the flexible substrate 101. That is, the groove 12 penetrates all film layers of the bent portion 10b of the display panel 10 to improve the stress release performance of the bent portion 10b.

[0102] Optionally, the display panel 10 further includes a light emitting device fg, which is disposed on the thin film transistor structure layer 102 and electrically connected to the thin film transistor tft.

[0103] It should be noted that the thin-film transistor (TFT) in the thin-film transistor structure layer 102 can be at least one of a top-gate type, a bottom-gate type, and a dual-gate type. The thin-film transistor structure layer 102 can have a film layer structure of a single thin-film transistor (TFT) or a stacked structure of at least two thin-film transistors (TFTs). The present embodiment uses a stacked structure of two thin-film transistors (TFTs) as an example, but is not limited thereto.

[0104] Optionally, the thin film transistor structure layer 102 includes a light shielding layer 02a, a buffer layer 02b, a first active layer 02c, a first insulating layer 02d, a first metal layer 02e, a second insulating layer 02f, a second metal layer 02g, a first interlayer dielectric layer 02h, a second active layer 02i, a third insulating layer 02j, a third metal layer 02k, a second interlayer dielectric layer 02m and a fourth metal layer 02n.

[0105] A light shielding layer 02a is disposed on a flexible substrate 101. A buffer layer 02b is disposed on the light shielding layer 02a and covers the flexible substrate 101. A first active layer 02c is disposed on the buffer layer 02b. A first insulating layer 02d covers the first active layer 02c and the buffer layer 02b. A first metal layer 02e is disposed on the first insulating layer 02d. The first metal layer 02e includes a first gate electrode g1 that overlaps with the first active layer 02c. A second insulating layer 02f covers the first metal layer 02e and the first insulating layer 02d. A second metal layer 02g is disposed on the second insulating layer 02f. The second metal layer 02g includes an electrode plate c1 and a second gate electrode g2. The electrode plate c1 overlaps with the first gate electrode g1 to form a capacitor. The second gate electrode g2 is located on one side of the electrode plate c1. A first interlayer dielectric layer 02h covers the second metal layer 02g and the second insulating layer 02f. A second active layer 02i is disposed on the first interlayer dielectric layer 02h. The second active layer 02i overlaps with the second gate electrode g2. The third insulating layer 02j covers the second active layer 02i and the first interlayer dielectric layer 02h. The third metal layer 02k is disposed on the third insulating layer 02j. The third metal layer 02k includes a third gate electrode g3 that overlaps the second active layer 02i. The second interlayer dielectric layer 02m covers the third metal layer 02k and the third insulating layer 02j. The fourth metal layer 02n is disposed on the second interlayer dielectric layer 02m. The fourth metal layer 02n includes a first source electrode s1, a first drain electrode d1, a second source electrode s2, and a second drain electrode d2. The first source electrode s1 and the first drain electrode d1 are connected to the first active layer 02c. The second source electrode s2 and the second drain electrode d2 are connected to the second active layer 02i.

[0106] The buffer layer 02b, the first insulating layer 02d, the second insulating layer 02f, the first interlayer dielectric layer 02h, the third insulating layer 02j and the second interlayer dielectric layer 02m are stacked to form an inorganic insulating stack dc. The groove k1 penetrates at least one layer of the inorganic insulating stack dc.

[0107] That is to say, the groove k1 can penetrate the second interlayer dielectric layer 02m, can penetrate the third insulating layer 02j and the second interlayer dielectric layer 02m, can penetrate the first interlayer dielectric layer 02h, the third insulating layer 02j and the second interlayer dielectric layer 02m, can penetrate the second insulating layer 02f, the first interlayer dielectric layer 02h, the third insulating layer 02j and the second interlayer dielectric layer 02m, can penetrate the first insulating layer 02d, the second insulating layer 02f, the first interlayer dielectric layer 02h, the third insulating layer 02j and the second interlayer dielectric layer 02m, and can also penetrate the buffer layer 02b, the first insulating layer 02d, the second insulating layer 02f, the first interlayer dielectric layer 02h, the third insulating layer 02j and the second interlayer dielectric layer 02m.

[0108] The deeper the groove k1 is, the stronger its ability to release the stress of the bent portion 10b is. Therefore, in order to release the stress of the bent portion 10b to the greatest extent, the groove k1 of this embodiment penetrates the entire inorganic insulating laminate dc.

[0109] Optionally, the slot k1 covers the entire area of ​​the bent portion 10b, that is, the bent portion 10b is not provided with the inorganic insulating laminate dc, thereby minimizing the stress on the bent portion 10b.

[0110] In some embodiments, the coverage of the slot k1 can also be set according to actual conditions.

[0111] Optionally, the display panel 10 further includes a transition portion 02p and a planar layer 02r. The transition portion 02p and the trace 11 are disposed on the same layer on the organic layer 103. The transition portion 02p is connected to the first drain electrode d1. The planar layer 02r covers the transition portion 02p, the trace 11, and the organic layer 103.

[0112] The light-emitting device fg includes an anode f1, a pixel definition layer f2, a light-emitting layer, and a cathode. The anode f1 is disposed on the flat layer 02r and connected to the transition portion 02p. The pixel definition layer f2 is disposed on the flat layer 02r and extends to cover the bent portion 10b.

[0113] The groove 12 also extends through the flexible substrate 101. That is, the groove 12 passes through all film layers of the bending portion 10b of the entire display panel 10.

[0114] In some embodiments, the groove 12 penetrates at least a portion of the protective layer 33, the pixel definition layer f2, the planarization layer 02r, and the organic layer 103. For example, the groove 12 penetrates the flexible substrate 101, or may penetrate one of the buffer layer 02b, the first insulating layer 02d, the second insulating layer 02f, the first interlayer dielectric layer 02h, the third insulating layer 02j, and the second interlayer dielectric layer 02m.

[0115] In some embodiments, the pixel definition layer f2 may not be disposed in the bending portion 10b area.

[0116] Optionally, the display panel 10 further includes a sealing adhesive 34, which fills the groove 12. In some embodiments, a protective layer 33 may also be used to fill the groove 12. In other words, the protective layer 33 is formed after the bent portion 10b is bent and fixed and the display panel 10 is attached to the cover plate 20, thereby saving the sealing adhesive 34.

[0117] Example 2

[0118] 9 to 11 , the display module 100 of the present embodiment differs from the display module 100 of the above embodiment in that the shape of the cover plate 20 is different. When the cover plate 20 is attached to the display panel 10 , the bent portion 10 b has corresponding partitions. Specifically:

[0119] In the long axis direction N of the bent portion 10 b , the bent portion 10 b includes a first region b1 and a second region b2 , and the second region b2 is located on an opposite side of the first region b1 .

[0120] The conforming curved surface 20q includes a first curved surface q1 covering the first area b1 and a second curved surface q2 covering the second area b2. The second curved surface q2 connects to the opposite side of the first curved surface q1. Along the long axis N of the bend 10b, the radii of curvature of the first curved surface q1 and the second curved surface q2 are equal, with the first curved surface q1 having a greater radius of curvature than the second curved surface q2.

[0121] In regions with the same arc length, the number of the trenches 12 located in the first region b1 is smaller than the number of the trenches 12 located in the second region b2.

[0122] Among them, the curvature radius of the first curved surface q1 is greater than the curvature radius of the second curved surface q2, so that the stress on the first area b1 of the bending portion 10b is less than the stress on the second area b2. Therefore, more grooves 12 are set in the second area b2 with greater stress to release more stress, thereby reducing the risk of breakage of the wiring 11.

[0123] Optionally, the distance L1 between two adjacent trenches 12 in the first region b1 is greater than the distance L2 between two adjacent trenches 12 in the second region b2.

[0124] That is, this embodiment uses different spacings to adjust the density of the grooves 12 in the first area b1 and the second area b2. The greater the density, the smaller the spacing between the grooves 12.

[0125] Optionally, the ratio of the number of grooves 12 in the first region b1 to the number of grooves in the second region b2 is negatively correlated with the ratio of the radius of curvature of the first curved surface q1 to the radius of curvature of the second curved surface q2. For example, if the ratio of the radius of curvature of the first curved surface q1 to the radius of curvature of the second curved surface q2 is T, and T is greater than 0, then the number of grooves 12 in the first region b1 is 1 / T of the number of grooves 12 in the second region b2.

[0126] For example, if the ratio of the curvature radius of the first curved surface q1 to the curvature radius of the second curved surface q2 is 3, the number of the grooves 12 in the first area b1 is 1 / 3 of the number of the grooves 12 in the second area b2.

[0127] In the mobile phone scenario simulation experiment, in Comparative Example 1, the radius of curvature of the first curved surface q1 was set much larger than that of the second curved surface q2, and the arc length of the second curved surface q2 was 5 mm. In Comparative Example 2, the radius of curvature of the first curved surface q1 was set much larger than that of the second curved surface q2, and the arc length of the second curved surface q2 was 10 mm.

[0128] The curvature radius of the second curved surface q2 of the two comparative examples is the same, the curvature radius of the first curved surface q1 is also the same, and the total arc length of the first curved surface q1 + the second curved surface q2 is the same.

[0129] At the same bending radius of the bent portion 10b (the bending radius when bent toward the back of the display body 10a), as shown in Figure 12, the upward warping amount M of the bent portion 10b in Comparative Example 1 is 0.4586 mm, while the upward warping amount M of the bent portion 10b in Comparative Example 2 is 0.5871 mm.

[0130] The warp M is the distance between the outer arc point U and the central axis Q of the bend. The central axis Q is the midline between the upper and lower ends of the bend. The greater the warp M, the greater the bending stress on the bend, and the greater the risk of cable breakage in the bend.

[0131] As can be seen from Figure 12, the warping amount M of Comparative Example 2 is approximately 28% greater than that of Comparative Example 1. This shows that the bending stress on the bent portion of Comparative Example 2 is greater.

[0132] Optionally, when the display module 100 is used in a mobile phone, the arc length of the second curved surface q2 in the long axis direction N of the bent portion 10b is between 3 mm and 10 mm, for example, it can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0133] The arc length of the second curved surface q2 is less than or equal to 10 mm to prevent excessive bending stress on the second area b2 of the bent portion 10b. The arc length of the second curved surface q2 is greater than or equal to 3 mm to prevent insufficient edge width and reduce the number of grooves 12.

[0134] Optionally, the first curved surface q1 and the second curved surface q2 of the cover plate 20 further extend beyond the display panel 10 .

[0135] In some embodiments, the contact surface 20q of the cover plate 20 may also be a third curved surface, connected to the side of the second curved surface q2 away from the first curved surface q1. The second curved surface q2 fully covers the bent portion 10b, and the third curved surface is located outside the bent portion 10b, that is, the third curved surface does not cover the bent portion 10b.

[0136] The radius of curvature of the third curved surface decreases from the side where the third curved surface connects to the second curved surface q2 to the direction where the third curved surface moves away from the second curved surface q2. The maximum radius of curvature of the third curved surface q3 is equal to the radius of curvature of the second curved surface q2.

[0137] The cover plate 20 includes two side edge portions with a third curved surface q3 to improve the user's grip and smoothly narrow the frame.

[0138] Example 3:

[0139] 13 to 15 , the display module 100 of the present embodiment differs from the display modules 100 of the above embodiments in that the cover plate 20 has a different shape. When the cover plate 20 is attached to the display panel 10 , the bent portion 10 b has corresponding partitions. Specifically:

[0140] In the long axis direction N of the bent portion 10 b , the bent portion 10 b includes a first region b1 and a second region b2 , and the second region b2 is located on an opposite side of the first region b1 .

[0141] The conforming curved surface 20q includes a first curved surface q1 covering the first area b1 and a second curved surface q2 covering the second area b2. The second curved surface q2 is connected to the opposite side of the first curved surface q1. In the long axis direction N of the bent portion 10b, the curvature radius of the first curved surface q1 is equal.

[0142] The curvature radius of the second curved surface q2 decreases from the side where the second curved surface q2 is connected to the first curved surface q1 to the direction in which the second curved surface q2 is away from the first curved surface q1.

[0143] In regions with the same arc length, the number of the trenches 12 located in the first region b1 is smaller than the number of the trenches 12 located in the second region b2.

[0144] Among them, the curvature radius of the first curved surface q1 is equal to the maximum curvature radius of the second curved surface q2, so that the stress on the first area b1 of the bending portion 10b is smaller than the stress on the second area b2. Therefore, more grooves 12 are set in the second area b2 with greater stress to release more stress, thereby reducing the risk of breakage of the wiring 11.

[0145] Optionally, the distance between two adjacent trenches 12 in the first region b1 is greater than the distance between two adjacent trenches 12 in the second region b2.

[0146] That is, this embodiment uses different spacings to adjust the density of the grooves 12 in the first area b1 and the second area b2. The greater the density, the smaller the spacing between the grooves 12.

[0147] Optionally, in the second region b2 , the density of the trenches 12 increases gradually from the side where the second region b2 is connected to the first region b1 to the direction where the second region b2 is away from the first region b1 .

[0148] Since the smaller the curvature radius of the fitting surface 20q, the greater the stress impact on the bent portion 10b, the density of the grooves 12 arranged in the second area b2 is gradually increased, which can better release the bending stress of the second area b2 and reduce the risk of the trace 11 breaking.

[0149] Optionally, the first curved surface q1 and the second curved surface q2 of the cover plate 20 further extend beyond the display panel 10 .

[0150] Optionally, the fitting curved surface 20q of the cover plate 20 may also be a third curved surface q3, and the third curved surface q3 is connected to a side of the second curved surface q2 away from the first curved surface q1.

[0151] The curvature radius of the third curved surface q3 decreases from the side where the third curved surface q3 connects to the second curved surface q2 to the direction in which the third curved surface q3 moves away from the second curved surface q2. The maximum curvature radius of the third curved surface q3 is equal to the minimum curvature radius of the second curved surface q2.

[0152] The cover plate 20 includes two side edge portions with a third curved surface q3 to improve the user's grip and smoothly narrow the frame.

[0153] Example 4:

[0154] 16 , the display module 100 of the present embodiment differs from the display modules 100 of the above embodiments in that the structure of the bent portion 10b is different. Specifically:

[0155] The display panel 10 includes a flexible substrate 101 , a thin film transistor structure layer 102 and an organic layer 103 .

[0156] The flexible substrate 101 is provided in the areas of the display body 10 a , the bending portion 10 b , and the binding portion 10 c .

[0157] The thin-film transistor structure layer 102 includes a thin-film transistor (TFT) and an inorganic insulating layer (DC). The TFT is located in the display body 10a region. The inorganic insulating layer (DC) is disposed in the display body 10a, the bend 10b, and the binding portion 10c. The inorganic insulating layer (DC) is provided with a plurality of slots (k1). The slots (k1) are disposed in the bend 10b region. The plurality of slots (k1) are arranged along the longitudinal direction (N) of the bend 10b. The slots (k1) extend along the bend direction (W) of the bend 10b. At least one of the source, drain, and gate of the TFT is disposed on the same layer as the trace 11.

[0158] The organic layer 103 is provided in a region of the display body 10 a .

[0159] The groove k1 is filled with an organic material yj, and a groove k1 is formed on the organic material yj. The depth of the groove k1 is less than the thickness of the organic material yj, and the width of the groove 12 is less than the width of the organic material yj.

[0160] The trace 11 is disposed on the same layer as at least one of the source, drain, or gate electrodes of the thin-film transistor (TFT). Compared to the previous embodiment, this reduces the thickness of the bent portion 10b, thereby reducing the bending stress experienced by the bent portion 10b. Furthermore, the organic layer 103, planar layer 02r, and pixel definition layer f2 are also not disposed in the bent portion 10b region, further reducing the thickness of the bent portion 10b.

[0161] Optionally, the organic material yj may be formed in the same process as the organic layer 103 , that is, the organic material yj and the organic layer 103 are made of the same material.

[0162] In addition, the depth of the groove 12 is less than the total thickness of the organic material yj and the protective layer 33, so that the groove 12 cannot penetrate the organic material yj, so that the inorganic insulating stack dc on both sides of the groove k1 is connected through the organic material yj, thereby improving the overall stability and waterproof oxygen performance of the bending portion 10b.

[0163] Optionally, at least one of the light shielding layer 02 a , the first metal layer 02 e , the second metal layer 02 g , the third metal layer 02 k and the fourth metal layer 02 n is provided in the same layer as the trace 11 .

[0164] In some embodiments, the groove 12 penetrates all film layers of the bending portion 10 b to improve the anti-bending performance of the bending portion 10 b.

[0165] In some embodiments, a protective layer 33 may also be used to fill the groove 12. That is, the protective layer 33 is formed after the bent portion 10b is bent and fixed and the display panel 10 is attached to the cover plate 20, thereby saving the packaging glue 34.

[0166] Example 5

[0167] Accordingly, an embodiment of the present application further provides a display terminal, which includes the display module 100 as described in any one of the above embodiments.

[0168] Optionally, the display terminal may be a television, a mobile phone, a tablet computer, a laptop computer, a desktop computer, a smart wearable display device (such as a watch, a bracelet, etc.), a VR device, or an AR device.

[0169] The display module of the display terminal of this embodiment has a structure similar to or identical to that of the display module 100 of any of the above embodiments.

[0170] The display module of the embodiment of the present application includes a display panel and a cover plate. The display panel includes a display body, a bending portion and a binding portion connected in sequence, and the binding portion is arranged on the back of the display body through the bending portion; the cover plate has a fitting curved surface facing the display panel, and a portion of the fitting curved surface is fitted to the display side of the display panel through transparent adhesive, and the fitting curved surface fully covers the display body and the bending portion; the bending portion includes a wiring, and at least one groove is opened on the bending portion, and the groove extends along the bending direction of the bending portion and is located on the outside of the wiring.

[0171] The display module of the embodiment of the present application is provided with a groove on the bending portion to release the bending stress on the bending portion, thereby reducing the risk of wiring breakage in the bending portion.

[0172] The above is a detailed introduction to a display module and a display terminal provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A display module, comprising: A display panel, the display panel comprising a display body, a bending portion and a binding portion connected in sequence, the binding portion being arranged on the back of the display body through the bending portion; A cover plate, wherein the cover plate has a bonding curved surface facing the display panel, a portion of the bonding curved surface is bonded to the display side of the display panel through a transparent adhesive, and the bonding curved surface fully covers the display body and the bent portion; The bending portion includes a routing line, and at least one groove is formed on the bending portion. The groove is extended along the bending direction of the bending portion and is located outside the routing line.

2. The display module according to claim 1, wherein: In the long axis direction of the bending portion, the curvature radii of the fitting curved surface are equal, and the plurality of grooves are evenly arranged.

3. The display module according to claim 1, wherein: In the long axis direction of the bending portion, the bending portion includes a first area and a second area, and the second area is located on the opposite side of the first area; The fitting curved surface includes a first curved surface covering the first area and a second curved surface covering the second area, the second curved surface is connected to the opposite side of the first curved surface, and in the long axis direction of the bending portion, the curvature radii of the first curved surface and the curvature radii of the second curved surface are equal, and the curvature radius of the first curved surface is greater than the curvature radius of the second curved surface; In regions with the same arc length, the number of the grooves located in the first region is smaller than the number of the grooves located in the second region.

4. The display module according to claim 3, wherein: A distance between two adjacent grooves in the first region is greater than a distance between two adjacent grooves in the second region.

5. The display module according to claim 1, wherein: In the long axis direction of the bending portion, the bending portion includes a first area and a second area, and the second area is located on the opposite side of the first area; The fitting curved surface includes a first curved surface covering the first area and a second curved surface covering the second area, the second curved surface is connected to the opposite side of the first curved surface, and the curvature radii of the first curved surface are equal in the long axis direction of the bending portion; the curvature radius of the second curved surface decreases from the side where the second curved surface is connected to the first curved surface to the direction where the second curved surface is away from the first curved surface; In regions with the same arc length, the number of the grooves located in the first region is smaller than the number of the grooves located in the second region.

6. The display module according to claim 5, wherein: In the second region, the density of the grooves increases gradually from a side of the second region connected to the first region toward a direction in which the second region is away from the first region.

7. The display module according to claim 1, wherein: The display panel comprises: A flexible substrate, wherein the flexible substrate is arranged in the region of the display body, the bending portion and the binding portion; A thin film transistor structure layer, the thin film transistor structure layer comprising a thin film transistor and an inorganic insulating stack, the thin film transistor is located in the region of the display body, the inorganic insulating stack is at least arranged in the region of the display body and the binding portion, the inorganic insulating stack is provided with a groove, and the groove is arranged in the region of the bending portion; An organic layer, the organic layer is arranged on the thin film transistor structure layer, the organic layer extends from the area of ​​the display body to cover the area of ​​the bent portion and fills the groove, and the wiring is arranged on the organic layer; Wherein, in the region of the bending portion, the organic layer is provided with the groove, and the groove at least penetrates a portion of the organic layer.

8. The display module according to claim 7, wherein: The groove penetrates through all film layers of the bending portion.

9. The display module according to claim 7, wherein: The thin film transistor structure layer includes a light shielding layer, a buffer layer, a first active layer, a first insulating layer, a first metal layer, a second insulating layer, a second metal layer, a first interlayer dielectric layer, a second active layer, a third insulating layer, a third metal layer, a second interlayer dielectric layer and a fourth metal layer; The light shielding layer is arranged on the flexible substrate, the buffer layer is arranged on the light shielding layer and covers the flexible substrate, the first active layer is arranged on the buffer layer, the first insulating layer covers the first active layer and the buffer layer, the first metal layer is arranged on the first insulating layer, the first metal layer includes a first grid overlapped with the first active layer, the second insulating layer covers the first metal layer and the first insulating layer, the second metal layer is arranged on the second insulating layer, the second metal layer includes an electrode plate and a second grid, the electrode plate overlaps with the first grid to form a capacitor, the second grid is located on one side of the electrode plate, the first interlayer dielectric layer covers the second metal layer and the a second insulating layer, the second active layer is arranged on the first interlayer dielectric layer, the second active layer is overlapped with the second gate electrode, the third insulating layer covers the second active layer and the first interlayer dielectric layer, the third metal layer is arranged on the third insulating layer, the third metal layer includes a third gate electrode overlapped with the second active layer, the second interlayer dielectric layer covers the third metal layer and the third insulating layer, the fourth metal layer is arranged on the second interlayer dielectric layer, the fourth metal layer includes a first source electrode, a first drain electrode, a second source electrode and a second drain electrode, the first source electrode and the first drain electrode are connected to the first active layer, and the second source electrode and the second drain electrode are connected to the second active layer; The buffer layer, the first insulating layer, the second insulating layer, the first interlayer dielectric layer, the third insulating layer and the second interlayer dielectric layer are stacked to form the inorganic insulating stack, and the groove at least penetrates through one layer of the inorganic insulating stack.

10. The display module according to claim 7, wherein: The display panel further includes a protective layer, the protective layer covers the bent portion and extends to cover the display body and a portion of the binding portion, and the groove penetrates the protective layer; The display panel further includes a packaging adhesive, and the packaging adhesive is filled in the groove.

11. The display module according to claim 1, wherein: The display panel comprises: A flexible substrate, wherein the flexible substrate is arranged in the region of the display body, the bending portion and the binding portion; A thin film transistor structure layer, the thin film transistor structure layer comprises a thin film transistor and an inorganic insulating stack, the thin film transistor is located in the region of the display body, the inorganic insulating stack is arranged in the region of the display body, the bending portion and the binding portion, the inorganic insulating stack is provided with a plurality of grooves, the grooves are arranged in the region of the bending portion, the plurality of grooves are arranged along the long axis direction of the bending portion, and the grooves are extended along the bending direction of the bending portion; at least one of the source, drain and gate of the thin film transistor is arranged in the same layer as the routing; The groove is filled with an organic material, the organic material is provided with the groove, the depth of the groove is less than the thickness of the organic material, or the groove runs through all film layers of the bending portion.

12. A display terminal, comprising a display module; the display module comprises: A display panel, the display panel comprising a display body, a bending portion and a binding portion connected in sequence, the binding portion being arranged on the back of the display body through the bending portion; A cover plate, wherein the cover plate has a bonding curved surface facing the display panel, a portion of the bonding curved surface is bonded to the display side of the display panel through a transparent adhesive, and the bonding curved surface fully covers the display body and the bent portion; The bending portion includes a routing line, and at least one groove is formed on the bending portion. The groove is extended along the bending direction of the bending portion and is located outside the routing line.

13. The display terminal according to claim 12, wherein: In the long axis direction of the bending portion, the curvature radii of the fitting curved surface are equal, and the plurality of grooves are evenly arranged.

14. The display terminal according to claim 12, wherein: In the long axis direction of the bending portion, the bending portion includes a first area and a second area, and the second area is located on the opposite side of the first area; The fitting curved surface includes a first curved surface covering the first area and a second curved surface covering the second area, the second curved surface is connected to the opposite side of the first curved surface, and in the long axis direction of the bending portion, the curvature radii of the first curved surface and the curvature radii of the second curved surface are equal, and the curvature radius of the first curved surface is greater than the curvature radius of the second curved surface; In regions with the same arc length, the number of the grooves located in the first region is smaller than the number of the grooves located in the second region.

15. The display terminal according to claim 14, wherein: A distance between two adjacent grooves in the first region is greater than a distance between two adjacent grooves in the second region.

16. The display terminal according to claim 12, wherein: In the long axis direction of the bending portion, the bending portion includes a first area and a second area, and the second area is located on the opposite side of the first area; The fitting curved surface includes a first curved surface covering the first area and a second curved surface covering the second area, the second curved surface is connected to the opposite side of the first curved surface, and the curvature radii of the first curved surface are equal in the long axis direction of the bending portion; the curvature radius of the second curved surface decreases from the side where the second curved surface is connected to the first curved surface to the direction where the second curved surface is away from the first curved surface; In regions with the same arc length, the number of the grooves located in the first region is smaller than the number of the grooves located in the second region.

17. The display terminal according to claim 16, wherein: In the second region, the density of the grooves increases gradually from a side of the second region connected to the first region toward a direction in which the second region is away from the first region.

18. The display terminal according to claim 12, wherein: The display panel comprises: A flexible substrate, wherein the flexible substrate is arranged in the region of the display body, the bending portion and the binding portion; A thin film transistor structure layer, the thin film transistor structure layer comprising a thin film transistor and an inorganic insulating stack, the thin film transistor is located in the region of the display body, the inorganic insulating stack is at least arranged in the region of the display body and the binding portion, the inorganic insulating stack is provided with a groove, and the groove is arranged in the region of the bending portion; An organic layer, the organic layer is arranged on the thin film transistor structure layer, the organic layer extends from the area of ​​the display body to cover the area of ​​the bent portion and fills the groove, and the wiring is arranged on the organic layer; Wherein, in the region of the bending portion, the organic layer is provided with the groove, and the groove at least penetrates a portion of the organic layer.

19. The display terminal according to claim 18, wherein: The groove penetrates through all film layers of the bending portion.

20. The display terminal according to claim 18, wherein: The thin film transistor structure layer includes a light shielding layer, a buffer layer, a first active layer, a first insulating layer, a first metal layer, a second insulating layer, a second metal layer, a first interlayer dielectric layer, a second active layer, a third insulating layer, a third metal layer, a second interlayer dielectric layer and a fourth metal layer; The light shielding layer is arranged on the flexible substrate, the buffer layer is arranged on the light shielding layer and covers the flexible substrate, the first active layer is arranged on the buffer layer, the first insulating layer covers the first active layer and the buffer layer, the first metal layer is arranged on the first insulating layer, the first metal layer includes a first grid overlapped with the first active layer, the second insulating layer covers the first metal layer and the first insulating layer, the second metal layer is arranged on the second insulating layer, the second metal layer includes an electrode plate and a second grid, the electrode plate overlaps with the first grid to form a capacitor, the second grid is located on one side of the electrode plate, the first interlayer dielectric layer covers the second metal layer and the a second insulating layer, the second active layer is arranged on the first interlayer dielectric layer, the second active layer is overlapped with the second gate electrode, the third insulating layer covers the second active layer and the first interlayer dielectric layer, the third metal layer is arranged on the third insulating layer, the third metal layer includes a third gate electrode overlapped with the second active layer, the second interlayer dielectric layer covers the third metal layer and the third insulating layer, the fourth metal layer is arranged on the second interlayer dielectric layer, the fourth metal layer includes a first source electrode, a first drain electrode, a second source electrode and a second drain electrode, the first source electrode and the first drain electrode are connected to the first active layer, and the second source electrode and the second drain electrode are connected to the second active layer; The buffer layer, the first insulating layer, the second insulating layer, the first interlayer dielectric layer, the third insulating layer and the second interlayer dielectric layer are stacked to form the inorganic insulating stack, and the groove at least penetrates through one layer of the inorganic insulating stack.

Images