Display panel and display device

Abstract

The display panel (1) comprises a fixed area (11), a flat display area (12), and a sliding area (13), the fixed area (11) and the sliding area (13) are respectively located on both sides of the flat display area (12) in a first direction, the fixed area (11) is configured to be bonded with a middle frame, the flat display area (12) is configured to display images, and the sliding area (13) is configured to form a rolled state and an extended state by sliding, and in the extended state, the sliding area (13) displays images together with the flat display area (12), and in a plane perpendicular to the display panel (1), the display panel (1) at least comprises a display substrate (10), a bonding layer (20) arranged on the display substrate, and a cover layer (30) arranged on a side of the bonding layer (20) away from the display substrate (10), the cover layer (30) at least comprises a glass layer (31), and at least one of the glass layers of the fixed area (11) and the glass layers of the sliding area (13) is provided with at least one structural hole (2, 3), the structural hole (2, 3) is in the shape of a strip extending along a second direction, and the first direction and the second direction intersect.

Description

Technical Field

[0001] This disclosure relates to, but is not limited to, the field of display technology, and specifically to a display panel and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) and quantum dot light-emitting diodes (QLEDs) are active-matrix display devices with advantages such as self-illumination, wide viewing angle, high contrast, low power consumption, extremely fast response speed, thinness, flexibility, and low cost. With the continuous development of display technology, electronic display devices using OLEDs or QLEDs as light-emitting devices and thin-film transistors (TFTs) for signal control have become the mainstream products in the display field. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0004] On one hand, this disclosure provides a display panel including a fixed area, a flat display area, and a sliding area. The fixed area and the sliding area are respectively located on both sides of the flat display area in a first direction. The fixed area is configured to be fixedly connected to a mid-frame. The flat display area is configured to display images. The sliding area is configured to form a rolled-up state and an extended state by sliding. In the extended state, it displays images together with the flat display area. On a plane perpendicular to the display panel, the display panel includes at least a display substrate, an adhesive layer disposed on the display substrate, and a cover layer disposed on the adhesive layer on the side away from the display substrate. The cover layer includes at least a glass layer. At least one of the glass layer of the fixed area and the glass layer of the sliding area is provided with at least one structural hole. The shape of the structural hole is a strip shape extending along a second direction, where the first direction and the second direction intersect.

[0005] In an exemplary embodiment, the structural hole includes a first structural hole disposed in the glass layer of the fixing region, the depth of the first structural hole being the same as the thickness of the glass layer of the fixing region, and the thickness of the glass layer of the fixing region being 50 μm to 200 μm.

[0006] In an exemplary embodiment, the thickness of the glass layer in the sliding region is 25 μm to 80 μm.

[0007] In an exemplary embodiment, the structural hole includes a second structural hole disposed in the glass layer of the sliding zone, the depth of the second structural hole being the same as the thickness of the glass layer of the sliding zone, the thickness of the glass layer of the sliding zone being 200 μm to 800 μm.

[0008] In an exemplary embodiment, the cross-sectional shape of the glass layer in the fixing area is arc-shaped on a plane perpendicular to the display panel, and the arc-shaped glass layer in the fixing area is formed by a three-dimensional hot bending process.

[0009] In an exemplary embodiment, the structural hole includes a first structural hole and a second structural hole, wherein the first structural hole is disposed in the glass layer in the fixed region and the second structural hole is disposed in the glass layer in the sliding region.

[0010] In an exemplary embodiment, the cover plate layer further includes a filler layer that fills the structural holes.

[0011] In an exemplary embodiment, the material of the filler layer includes an organic polymer material.

[0012] In an exemplary embodiment, the difference between the refractive index of the filling layer material and the refractive index of the glass layer is less than or equal to 0.005.

[0013] In an exemplary embodiment, the structural hole has a length in the second direction and a width in the first direction, wherein the length is greater than the width.

[0014] In an exemplary embodiment, in the second direction, the structural hole includes a first end, a second end, and a main body portion between the first end and the second end. On a plane parallel to the display panel, the main body portion is shaped as a strip extending along the second direction, and the first end and the second end are semi-circular in shape.

[0015] In an exemplary embodiment, the main body includes an end region near the first end and the second end and a middle region away from the first end and the second end, wherein the width of the middle region is less than or equal to the width of the end region.

[0016] In an exemplary embodiment, the width of the main body gradually increases from the middle region to the end region.

[0017] In an exemplary embodiment, the width of the middle region is 30% to 70% of the width of the end regions.

[0018] In an exemplary embodiment, the structural hole includes a plurality of hole columns arranged sequentially along the first direction, and the hole columns include a plurality of structural holes arranged sequentially along the second direction; the plurality of hole columns include a plurality of odd-numbered hole columns and a plurality of even-numbered hole columns, the structural holes in the plurality of odd-numbered hole columns are aligned in the second direction, the structural holes in the plurality of even-numbered hole columns are aligned in the second direction, and the structural holes in the odd-numbered hole columns and the structural holes in the even-numbered hole columns are staggered in the second direction.

[0019] In an exemplary embodiment, a first spacing is provided between the centerline of the structural hole in at least one of the odd-numbered hole columns and the centerline of the structural hole in the adjacent even-numbered hole columns in the first direction, the first spacing being 0.5 to 3 times the width, and the centerline being a line passing through the geometric center of the structural hole along the second direction.

[0020] In an exemplary embodiment, in at least one row of adjacent structural holes, the structural holes in the second direction have a second spacing, the second spacing being 10% to 30% of the length.

[0021] In an exemplary embodiment, the center point of at least one of the structural holes in the odd-numbered hole columns has a misalignment distance with the center points of the structural holes in the even-numbered hole columns that are adjacent to each other in the first direction. The misalignment distance is 40% to 60% of the length, and the center point of the structural hole is the geometric center of the structural hole.

[0022] On the other hand, this disclosure also provides a display device, including the aforementioned display panel.

[0023] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure. The shapes and sizes of the components in the drawings do not reflect actual proportions and are only intended to illustrate the content of this disclosure.

[0025] Figure 1 This is a planar schematic diagram of a display panel in an extended state;

[0026] Figures 2A-2E This demonstrates the scrolling process of a display panel;

[0027] Figure 3 This is a cross-sectional schematic diagram of a display panel in a retracted state;

[0028] Figure 4This is a schematic cross-sectional view of a glass layer according to an exemplary embodiment of the present disclosure;

[0029] Figure 5 This is a plan view of a cover plate layer according to an exemplary embodiment of the present disclosure;

[0030] Figure 6 This is a plan view of the glass layer of a fixing part according to an exemplary embodiment of the present disclosure;

[0031] Figure 7A and Figure 7B These are stress simulation diagrams of a fixing part excluding the structural hole and a fixing part including the structural hole according to an exemplary embodiment of the present disclosure, respectively.

[0032] Figure 8 A plan view of the glass layer of another fixing part, which is an exemplary embodiment of the present disclosure;

[0033] Figures 9A-9H A schematic diagram illustrating the glass layer fabrication process of an exemplary embodiment of this disclosure;

[0034] Figure 10 A schematic plan view of another cover plate layer as an exemplary embodiment of this disclosure;

[0035] Figure 11A-11D This is a schematic diagram of a filling process for a first structural hole, which is an exemplary embodiment of the present disclosure.

[0036] Figures 12A-12C A schematic diagram of another filling process for a first structural hole, which is an exemplary embodiment of the present disclosure;

[0037] Figure 13 A schematic cross-sectional view of another glass layer as an exemplary embodiment of this disclosure;

[0038] Figure 14 This is a schematic cross-sectional view of another glass layer according to an exemplary embodiment of the present disclosure.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1-Display panel; 2-First structural hole; 3-Second structural hole;

[0041] 4-Organic polymer filler material; 10-Display panel; 11-Fixing area;

[0042] 12-Flat display area; 13-Roll-out area; 20-Adhesive layer;

[0043] 30 - Cover plate layer; 31 - Glass layer; 40 - Protective layer;

[0044] 41-Glass substrate; 42-Acid-resistant ink; 43-Mask;

[0045] 44 - Alkaline solution; 45 - Acid etching solution; 51 - Glass substrate;

[0046] 52-Mold substrate; 53-Filling material; 54-Film mounting tool;

[0047] 131 - Scroll display area; 132 - Scroll auxiliary area; 200 - Displayable area;

[0048] 310 - Fixed part; 311 - Horizontal part; 312 - Bending part;

[0049] 313 - Vertical part; 320 - Planar part; 330 - Sliding part;

[0050] 331 - First sub-sliding section; 332 - Second sub-sliding section. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this disclosure clearer, embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. Note that the implementation methods can be carried out in many different forms. Those skilled in the art will readily understand that the methods and content can be varied in various forms without departing from the spirit and scope of this disclosure. Therefore, this disclosure should not be construed as limited to the content described in the following embodiments. Without conflict, the embodiments and features in the embodiments of this disclosure can be arbitrarily combined with each other.

[0052] The scale of the figures in this disclosure can be used as a reference in actual manufacturing processes, but is not limited thereto. For example, the aspect ratio of the channel, the thickness and spacing of each film layer, and the width and spacing of each signal line can be adjusted according to actual needs. The number of pixels in the display substrate and the number of sub-pixels in each pixel are not limited to the quantities shown in the figures. The figures described in this disclosure are only schematic diagrams of the structure, and one aspect of this disclosure is not limited to the shapes or values ​​shown in the figures.

[0053] The ordinal numbers “first,” “second,” and “third” used in this specification are used to avoid confusion among the constituent elements, not to limit their quantity.

[0054] In this specification, for convenience, terms such as "middle," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships in conjunction with the accompanying drawings. This is solely for the purpose of facilitating the description and simplification, and does not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this disclosure. The positional relationships of the constituent elements may be appropriately varied depending on the orientation of each constituent element being described. Therefore, the use of terms not limited to those described in the specification may be appropriately replaced as needed.

[0055] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection via an intermediate component, or a connection within two components. Those skilled in the art will understand the specific meaning of these terms in this disclosure based on the specific circumstances.

[0056] In this specification, "parallel" refers to the state where the angle formed by two straight lines is greater than or equal to -10° and less than 10°, and therefore also includes the state where the angle is greater than or equal to -5° and less than 5°. Similarly, "perpendicular" refers to the state where the angle formed by two straight lines is greater than or equal to 80° and less than 100°, and therefore also includes the state where the angle is greater than or equal to 85° and less than 95°.

[0057] In this specification, the terms "film" and "layer" may be interchanged. For example, "conductive layer" may sometimes be replaced with "conductive film." Similarly, "insulating film" may sometimes be replaced with "insulating layer."

[0058] In this specification, triangles, squares, rectangles, trapezoids, pentagons, or hexagons are not strictly defined, but can be approximate triangles, squares, rectangles, trapezoids, pentagons, or hexagons. Small deformations due to tolerances are possible, and chamfers, curved edges, and other deformations are possible.

[0059] In this disclosure, “about” means a value that is not strictly limited and allows for process and measurement errors, such as within ±1%, ±5%, ±10%, ±20%, or ±30% of the value.

[0060] With the development of display technology, flexible display devices can change their screen size through winding, folding, and bending, forming rollable, flexible, foldable, sliding, and sliding display devices. These devices can be used not only in mobile devices such as smartphones and tablet computers, but also in televisions, vehicle displays, and wearable devices, expanding their application areas. Among these, sliding display devices offer adjustable display areas, providing convenience and space-saving features.

[0061] An exemplary embodiment of this disclosure provides a display panel including a fixed area, a flat display area, and a sliding area. The fixed area and the sliding area are respectively located on both sides of the flat display area in a first direction. The fixed area is configured to be fixedly connected to a mid-frame. The flat display area is configured to display images. The sliding area is configured to form a rolled-up state and an extended state by sliding. In the extended state, it displays images together with the flat display area. On a plane perpendicular to the display panel, the display panel includes at least a display substrate, an adhesive layer disposed on the display substrate, and a cover layer disposed on the adhesive layer on the side away from the display substrate. The cover layer includes at least a glass layer. At least one of the glass layer of the fixed area and the glass layer of the sliding area is provided with at least one structural hole. The shape of the structural hole is a strip shape extending along a second direction, where the first direction and the second direction intersect.

[0062] In an exemplary embodiment, the structural hole includes a first structural hole disposed in the glass layer of the fixing region, the depth of the first structural hole being the same as the thickness of the glass layer of the fixing region, and the thickness of the glass layer of the fixing region being 50 μm to 200 μm.

[0063] In an exemplary embodiment, the structural hole includes a second structural hole disposed in the glass layer of the sliding zone, the depth of the second structural hole being the same as the thickness of the glass layer of the sliding zone, the thickness of the glass layer of the sliding zone being 200 μm to 800 μm.

[0064] In an exemplary embodiment, the structural hole includes a first structural hole and a second structural hole, wherein the first structural hole is disposed in the glass layer in the fixed region and the second structural hole is disposed in the glass layer in the sliding region.

[0065] In an exemplary embodiment, the cover plate layer further includes a filler layer that fills the structural holes.

[0066] Figure 1 This is a planar schematic diagram of a display panel in an extended state. Figure 1 As shown, the display panel 1 may include a non-bent area and bent areas on both sides of the non-bent area. The bent areas may include a fixed area 11 and a sliding area 13. The non-bent area may include a flat display area 12. The fixed area 11 and the sliding area 13 are located on both sides of the flat display area 12 in a first direction X. The sliding area 13 may include a sliding display area 131 and a sliding auxiliary area 132. The sliding auxiliary area 132 does not participate in the display but only assists in the sliding process. The fixed area 11 is configured to be fixedly connected to the middle frame, such as by snapping or bonding. The flat display area 12 is configured to always be in a flat state for image display. The sliding area 13 is configured to form a rolled-up state and an extended state through sliding. When in the rolled-up state, the area of ​​the displayable area is the smallest; when in the extended state, the area of ​​the displayable area is the largest.

[0067] Figures 2A-2E This demonstrates the scrolling process of a display panel. For example... Figure 2A As shown, in the retracted state, the sliding display area 13 is bent and attached to the side and back of the telescopic mechanism (not shown), and does not participate in the display. That is, the sliding display area 131 is bent along the side and back of the telescopic mechanism in a direction opposite to the first direction X. The sliding auxiliary area 132 is located on the back of the flat display area 12 and is parallel to the flat display area 12. In the retracted state, neither the fixed area 11 nor the sliding display area 13 participates in the display, and only the flat display area 12 becomes the display area of ​​the display panel. At this time, the area of ​​the displayable area is minimized, making the display device easy to carry and saving space. The vertical projection of the sliding display area 131 and the sliding auxiliary area 132 of the sliding display area 13 in the Z direction at least partially overlaps with the vertical projection of the flat display area 12 in the Z direction.

[0068] like Figure 2B-2D As shown, during the process of the display panel gradually transitioning from the rolled-up state to the unfolded state, the sliding area 13 gradually extends into a plane through the sliding and unfolding of the sliding area 13.

[0069] like Figure 2E As shown, in the extended state, the sliding area 13 slides and bends on the surface of the telescopic mechanism with the help of the tension of the telescopic mechanism, gradually extending into a plane. That is, the sliding display area 131 extends into a plane and is on the same plane as the flat display area 12, thus becoming the displayable area in the sliding area 13 and displaying images together with the flat display area 12. The sliding auxiliary area 132 is bent and attached to the side of the telescopic mechanism and does not participate in the display. In the extended state, the fixed area 11 and the sliding auxiliary area 132 of the sliding area 13 do not participate in the display. Only the flat display area 12 and the sliding display area 131 of the sliding area 13 become the display area of ​​the display panel. At this time, the displayable area is the largest, thereby enhancing the display effect of the display device. The vertical projection of the sliding display area 131 of the sliding area 13 in the Z direction does not overlap with the flat display area 12.

[0070] By winding and extending the sliding area 13, the size range of the displayable area in the sliding area 13 can be increased or decreased, thereby realizing the free adjustment of the display area in the display device.

[0071] Figure 3 This is a cross-sectional schematic diagram of a display panel in a retracted state. Figure 3 As shown, in the thickness direction (Z direction) of the display panel 1, the display panel 1 may include at least a display substrate 10, an adhesive layer 20 disposed on the display substrate, and a cover layer 30 disposed on the side of the adhesive layer 20 away from the display substrate 10.

[0072] In an exemplary embodiment, the rollable display device may include an electroluminescent display or other types of display. The electroluminescent display may include an organic light-emitting diode display, a quantum dot light-emitting diode display, or a micro-LED display.

[0073] In an exemplary embodiment, the display substrate 10 may be an OLED display substrate. The OLED display substrate may include at least a driving circuit layer disposed on the substrate and a light-emitting structure layer disposed on the driving circuit layer. The light-emitting structure layer may include an anode, a cathode, and an organic light-emitting layer disposed between the anode and the cathode. The organic light-emitting layer may include stacked layers such as a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

[0074] In an exemplary embodiment, the adhesive layer 20 may be optically transparent adhesive (OCA) or optically transparent resin, which may be a thermosetting optically transparent resin or a UV-curing optically transparent resin.

[0075] In an exemplary embodiment, the cover layer 30 may include at least a glass layer 31 and a protective layer.

[0076] In an exemplary embodiment, the cover layer 30 may also include a buffer layer, etc.

[0077] In an exemplary embodiment, the protective layer may be made of materials such as polyimide (CPI) or polyethylene terephthalate (PET).

[0078] In exemplary embodiments, the display device may also include other film layers, such as touch films, polarizers, etc. For example, in the thickness direction of the display device, the display device may also include a back film layer disposed on the side of the display substrate away from the adhesive layer 20 and a support layer disposed on the side of the back film layer away from the display substrate 10.

[0079] Existing rollable display devices typically use a cover glass assembly, which is bent at a fixed curvature and bonded to the display device's frame via a fixing part located at the edge of the assembly. However, research has found that if the cover glass is made of a relatively thick glass (200μm-800μm), when the fixing part is bent at a fixed curvature, the difference between the Young's modulus of the CPI or PET film materials in the cover glass assembly and the Young's modulus of the cover glass itself results in excessive rebound force (a force tending to restore a flat state) at the fixing part. This can easily cause the film layers at the fixing part to peel off or separate. If a glass thickness of less than 200μm is used, although the rebound force at the fixing part is reduced, the impact resistance of the cover glass itself is weakened. Therefore, existing rollable display devices suffer from a contradiction between the impact resistance of the cover glass and the rebound force generated by the fixing part of the cover glass when bent.

[0080] Figure 4 This is a schematic cross-sectional view of a glass layer as an exemplary embodiment of this disclosure. Figure 4 As shown, corresponding to the bent and non-bent areas of the display panel, the glass layer 31 may include bent portions and non-bent portions. The bent portion may include a sliding portion 330 and a fixing portion 310. The non-bent portion may include a flat portion 320. The fixing portion 310 may be connected to the flat portion 320 and located on one side of the flat portion 320 in the first direction X. The sliding portion 330 may be connected to the flat portion 320 and located on the opposite side of the flat portion 320 in the first direction X. The fixing portion 310 may bend from the flat portion 320 along the first direction X towards the Z direction. The sliding portion 330 may include a first sub-sliding portion 331 connected to the flat portion 320 and a second sub-sliding portion 332 located on the side of the first sub-sliding portion 331 away from the flat portion 320.

[0081] In an exemplary embodiment, the fixing portion 310 may include a horizontal portion 311 connected to the fixing portion 310, a bent portion 312 located on the side of the horizontal portion 311 away from the fixing portion 310, and a vertical portion 313 located on the side of the bent portion 312 away from the horizontal portion 311. The horizontal portion 311 has a first curvature, the bent portion 312 has a second curvature, and the vertical portion 313 has a third curvature. The second curvature is much greater than the first curvature and the third curvature.

[0082] In an exemplary embodiment, the fixing part 310 may be provided with at least one first structural hole 2. The first structural hole 2 may be in the form of a through hole, that is, the first structural hole 2 penetrates through the glass layer 31, and the depth of the first structural hole 2 is the same as the thickness of the glass layer 31.

[0083] In an exemplary embodiment, the thickness of the fixing portion 310 of the glass layer 31 can be in the range of about 50 μm to about 200 μm, such as 60 μm, 90 μm, 120 μm, or 150 μm.

[0084] In an exemplary embodiment, the thickness of the sliding portion 330 of the glass layer 31 can be in the range of about 25 μm to about 80 μm, such as 40 μm, 50 μm, 60 μm, etc. Within this thickness range, the glass itself of the sliding portion can have bending properties.

[0085] In one possible exemplary embodiment, the cross-sectional shape of the fixing part 310 can be arc-shaped, and the arc-shaped fixing part 310 can be formed by a three-dimensional hot bending process or the like.

[0086] Figure 5 This is a plan view of a cover plate layer as an exemplary embodiment of this disclosure. Figure 5 As shown, the cover layer includes a glass layer 31 and a protective layer 40 (such as a CPI or PET layer) (the adhesive layer is not shown). The orthographic projection of the protective layer 40 on the display substrate is larger than the orthographic projection of the glass layer 31 on the display substrate. The orthographic projection of the glass layer 31 on the display substrate is larger than the orthographic projection of the displayable area (VA) 200 on the display substrate. A plurality of first structural holes 2 are provided within the fixing portion 310 of the glass layer 31. The protective layer 40 corresponding to the fixing portion 310 is completely coated with ink, so the fixing portion 310 is not visible, only decorative, and maintains the existing design style.

[0087] In an exemplary embodiment, a cover plate layer 30 is used, comprising an 80μm CPI layer 40, a 50μm optically transparent adhesive OCA layer 20, and a 70μm glass layer 31. Multiple structural holes are provided in the fixing portion 310 of the glass layer 31 of the cover plate layer 30. Performance tests on such a cover plate layer show that its bending performance at room temperature, high temperature, and low temperature can meet the level of outward folding R5. At the same time, the pen drop test data can reach up to 20cm, that is, the impact resistance is good. In addition, the rebound force of the fixing portion is significantly reduced, thereby reducing the risk of peeling or separation between the film layers in the fixing portion.

[0088] Figure 6 This is a plan view of a glass layer of a fixing part according to an exemplary embodiment of the present disclosure, showing the arrangement of a plurality of first structural holes 2 of equal cross-sectional width in the glass layer 31 of the fixing part 310. For example... Figure 6As shown, multiple first structural holes 2 can be arranged in a first direction X and a second direction Y intersecting the first direction X. The shape of the first structural holes 2 can be a strip shape extending along the second direction Y. The multiple first structural holes can be arranged in an array, including multiple hole columns, which are arranged sequentially along the first direction X. At least one hole column can include multiple first structural holes 2 arranged sequentially along the second direction Y. The multiple hole columns arranged sequentially along the first direction X can be referred to from left to right as the 1st hole column, the 2nd hole column, ..., the nth hole column. n is a positive integer greater than or equal to 2.

[0089] In an exemplary embodiment, the structural holes may include multiple odd-numbered hole columns and multiple even-numbered hole columns. The structural holes in the odd-numbered hole columns may be staggered with the structural holes in the adjacent even-numbered hole columns in the first direction X in the second direction Y. For example, the structural holes in the first hole column may be staggered with the structural holes in the second hole column in the second direction Y, the structural holes in the second hole column may be staggered with the structural holes in the third hole column in the second direction Y, and so on.

[0090] In an exemplary embodiment, the structural holes in an odd-numbered hole column can be aligned with the structural holes in another odd-numbered hole column that is separated from the even-numbered hole columns in the first direction in the second direction. For example, the structural holes in the first hole column can be aligned with the structural holes in the third hole column in the second direction Y, the structural holes in the second hole column can be aligned with the structural holes in the fourth hole column in the second direction Y, and so on.

[0091] The first structural hole 2 may have a first length L1 and a first width M1. The first length L1 may be the dimension of the first structural hole 2 in the second direction Y. The first width M1 may be the dimension of the first structural hole 2 in the first direction X. The first length L1 may be in the range of, for example, 3000 μm to 4000 μm. The first width M1 may be in the range of, for example, 100 μm to 400 μm.

[0092] In the second direction Y, the structural hole may include a first end, a second end, and a main body portion between the first end and the second end. On a plane parallel to the display panel, the main body portion is a strip shape extending along the second direction, and the first end and the second end are semi-circular in shape.

[0093] In an exemplary embodiment, the semicircles of the first end and the second end have a diameter D. This diameter D can be in the range of, for example, 100 μm to 400 μm.

[0094] In an exemplary embodiment, the main body may include an end region near the first end and the second end and a middle region away from the first end and the second end.

[0095] In an exemplary embodiment, the width of the middle region may be equal to the width of the end regions.

[0096] In an exemplary embodiment, the centerline of at least one odd-numbered row of structural holes may have a first spacing with the centerline of the structural holes in an adjacent even-numbered row of structural holes in the first direction X, the centerline being a line passing through the geometric center of the structural hole along the second direction Y. For example, in the first direction X, there is a first spacing H1 between the centerlines of adjacent first structural holes 2. This first spacing H1 may be in the range of, for example, 300 μm to 500 μm. For example, the first spacing H1 may be 1.2 to 3 times the first width M1.

[0097] In an exemplary embodiment, in at least one adjacent row of structural holes, there may be a second spacing between the structural holes in the second direction Y. For example, the second spacing may refer to the distance between the second end of a structural hole in at least one row of holes and the first end of another structural hole adjacent to it along the second direction Y. For example, in the second direction Y, there may be a second spacing W1 between adjacent first structural holes 2, which may be in the range of, for example, 100 μm to 300 μm. For example, the second spacing W1 may be 10% to 30% of the first length L1.

[0098] In an exemplary embodiment, the first structural hole 2 may have a center point, which is the geometric center of the first structural hole. The center points of the first structural holes 2 that are adjacent to each other in the first direction X may be staggered in the second direction Y.

[0099] In an exemplary embodiment, the center point of at least one odd-numbered row of structural holes may have a misalignment distance with the center points of structural holes in adjacent, staggered even-numbered rows of structural holes in the first direction X. For example, the center point C1 of structural hole S2-1 in the first row of holes may have a misalignment distance W2 with the center point C2 of structural hole S2-2 in the adjacent second row of holes in the first direction X. This misalignment distance W2 may be, for example, in the range of 1500 μm to 2000 μm. For example, the misalignment distance may be 40% to 60% of the first length L1.

[0100] In an exemplary embodiment, in at least one adjacent odd-numbered hole column, the midpoint between two center points of adjacent structural holes in the second direction Y can be aligned with the center point of at least one structural hole in an adjacent even-numbered hole column in the first direction X in the first direction X. For example, the midpoint along the second direction Y between the center point C1 of the first structural hole S2-1 and the center point C3 of the first structural hole S3-1 in the first hole column can be aligned with the center point C2 of the first structural hole S2-2 in the second hole column.

[0101] In an exemplary embodiment, a portion of the first structural holes S1-1 in the first hole row can be located at the upper edge of the fixing part 310, meaning the first structural holes S1-1 at the upper edge of the fixing part 310 are open without a first end. A portion of the first structural holes S4-1 in the first hole row can be located at the lower edge of the fixing part 310, meaning the first structural holes S4-1 at the lower edge of the fixing part 310 are open without a second end. A portion of the first structural holes S1-3 in the third hole row can be located at the upper edge of the fixing part 310, meaning the first structural holes S1-3 at the upper edge of the fixing part 310 are open without a first end. A portion of the first structural holes S4-3 in the third hole row can be located at the lower edge of the fixing part 310, meaning the first structural holes S4-3 at the lower edge of the fixing part 310 are open without a second end. The first structural holes in odd-numbered rows can be similarly provided.

[0102] In an exemplary embodiment, the first structural hole S1-2 in the second hole row can be provided at the upper edge of the fixing part 310, that is, the first structural hole S1-2 at the upper edge of the fixing part 310 has a complete first end and a second end. The first structural hole S4-2 in the second hole row can be provided at the lower edge of the fixing part 310, that is, the first structural hole S4-2 at the lower edge of the fixing part 310 has a complete first end and a second end. The first structural holes in even-numbered rows can be similarly provided.

[0103] According to this disclosure, the glass with a thickness range of 50μm-200μm has bending characteristics and certain impact resistance. Therefore, it is only necessary to set multiple structural holes in the fixing part at the edge of the glass layer to reduce the rebound force generated in the fixing part when the display panel is bent, thereby reducing the risk of peeling or separation between the film layers in the fixing part.

[0104] This disclosure uses glass with an elastic modulus between 50-100 GPa, such as 70 GPa, and a fixing part thickness of 50-200 μm, such as 150 μm, as the experimental object. The experimental conditions are a fixing part bending radius R of 3 mm and a bending angle of 90°. Stress simulations were performed on glass layers with fixing parts without the first structural hole and glass layers with fixing parts having the first structural hole, respectively. The stress simulation diagrams are shown below. Figure 7A and Figure 7B As shown. By Figure 7A and 7BAs can be seen, the fixing part 310 may include a horizontal part 311 connected to the planar part 320, a bent part 312 located on the side of the horizontal part 311 away from the planar part 320, and a vertical part 313 located on the side of the bent part 312 away from the horizontal part 311. By providing structural holes, the rebound force at the outermost part of the vertical part 313 is significantly reduced from 3713 MPa when no structural holes are provided to 246 MPa, a reduction of up to 93.4%. At the junction of the vertical part 313 and the bent part 312, the rebound force can be reduced from 2475 MPa to 165 MPa. This demonstrates that when a rollable display device is bent, by providing multiple structural holes in the fixing part at the edge of the glass layer, a significant reduction in the rebound force generated by the fixing part can be achieved, while ensuring that the impact resistance of the rollable part is not compromised.

[0105] Figure 8 This is a plan view of the glass layer of another fixing part according to an exemplary embodiment of the present disclosure, showing the arrangement of a plurality of first structural holes 2 with variable cross-sectional width strip shapes in the glass layer 31 of the fixing part 310. For example... Figure 8 As shown, multiple first structural holes 2 can be arranged in a first direction X and a second direction Y intersecting the first direction X. The multiple first structural holes 2 can be configured in an array, including multiple hole columns.

[0106] In an exemplary embodiment, in the second direction, the first structural hole 2 includes a first end, a second end, and a main body portion between the first end and the second end. On a plane parallel to the display panel, the main body portion is shaped as a strip extending along the second direction, and the first end and the second end are semi-circular in shape.

[0107] The first structural hole 2 may have a length L extending in the second direction Y, which may be in the range of 2000 μm to 7000 μm.

[0108] The width W of the first structural hole 2 is narrowest in the middle region, and this width W can be in the range of 150 μm to 200 μm. Two arc-shaped contour edges of the first structural hole 2, extending along the second direction Y, extend from the middle region towards both ends with radii of curvature R in the direction opposite to and from the second direction Y, respectively, until the width of the end region is the largest; that is, the width of the middle region of the first structural hole 2 is smaller than the width of the end region of the first structural hole 2. The radius of curvature R can be, for example, in the range of 25000 μm to 30000 μm (25 mm to 30 mm).

[0109] In an exemplary embodiment, the main body may include an end region near the first end and the second end and a middle region away from the first end and the second end, wherein the width of the middle region may be smaller than the width of the end region.

[0110] In an exemplary embodiment, the width of the main body can gradually increase from the middle region to the end region, and the width of the middle region can be 30% to 70% of the width of the end region.

[0111] In an exemplary embodiment, the first structural hole 2 has a center point, which is the geometric center of the first structural hole. The center points of the first structural holes 2 that are adjacent to each other in the first direction X can be staggered in the second direction Y.

[0112] In an exemplary embodiment, the density of the first structural hole in the bending portion of the fixing portion is maximized due to the maximum stress. Then, the density of the first structural hole gradually decreases along the direction away from the first direction X, i.e., from the bending portion to the horizontal portion, and along the direction towards the first direction X, i.e., from the bending portion to the vertical portion.

[0113] In an exemplary embodiment, the width of the first structural hole in the hole array at the bend of the fixing portion can be the largest, and then the width of the first structural hole in the hole array can gradually decrease along the direction away from the first direction X, i.e., from the bend to the horizontal portion, and the direction of the first direction X, i.e., from the bend to the vertical portion.

[0114] In an exemplary embodiment, since the widths of the structural holes in the multiple hole rows are different, the first spacing H1 can also be varied. For example, the first spacing H1 can be 0.5 to 3 times the first width M1.

[0115] In this embodiment, the width of the main body of the structural hole gradually decreases from the end region towards the middle region, that is, it has a gradually inward-receding shape. This design is compared to... Figure 6 The design of a constant width from the end region to the middle region of the main body allows for multi-directional decomposition of stress during bending, thereby reducing the maximum stress during bending and improving fatigue resistance. Furthermore, because the main body of the structural holes gradually tapers inward from the end region towards the middle region, a greater number of structural holes can be formed within a unit area of ​​the glass layer, resulting in a higher density of structural holes. This further reduces the maximum stress during bending, improves fatigue resistance, and does not reduce springback.

[0116] In an exemplary embodiment, the shape of the structural hole on the plane parallel to the display substrate may include any one or more of the following: triangle, square, rectangle, pentagon, hexagon, semicircle, circle, and ellipse.

[0117] Figures 9A-9H This is a schematic diagram illustrating the glass layer fabrication process according to an exemplary embodiment of the present disclosure. In an exemplary embodiment, the glass layer fabrication process may include:

[0118] (1) Provide and clean a glass substrate 41, the glass substrate 41 being approximately 500mm*500mm in size and approximately 60-100μm in thickness, such as approximately 70μm. Figure 9A As shown.

[0119] (2) Apply acid-resistant ink 42 evenly to the upper and lower surfaces of the glass substrate 41, such as... Figure 9B As shown.

[0120] (3) A mask plate 43 is placed on the acid-resistant ink 42, such as Figure 9C As shown.

[0121] (4) Expose the acid-resistant ink 42 and remove the mask 43, such as Figure 9D As shown.

[0122] (5) Subsequently, the glass substrate coated with the acid-resistant film is immersed in alkaline solution 44 to wash the exposed acid-resistant ink, and then rinsed with water, such as... Figure 9E and 9F As shown.

[0123] (5) Immerse the cleaned glass substrate with a partial acid-resistant film in acid etching solution 45 for acid etching and cleaning, such as Figure 9G As shown.

[0124] (6) Remove all the acid-resistant film 42 to obtain a glass substrate 41 with the first structural pore 2, such as Figure 9H As shown.

[0125] For glass layers with structural pores, subsequent thinning and strengthening are required. Conventional processes in the field, including laser cutting, stacking, cutting, edge strengthening, delamination, and chemical strengthening, can be used to obtain the desired glass layer.

[0126] In an exemplary embodiment, the faux acid film may be a patterned faux acid film, or it may be prepared by conventional processes in the art, such as photolithography, which includes coating with PR adhesive, re-exposure, development, etching, etc., to obtain a faux acid film with the desired pattern.

[0127] In some possible exemplary embodiments, through-hole structural holes can be formed in the glass layer by laser drilling, which is not limited herein.

[0128] Figure 10 This is a plan view of another cover plate layer according to an exemplary embodiment of this disclosure. Figure 10As shown, the cover layer includes a glass layer 31 and a protective layer 40 (such as a CPI or PET layer). The orthographic projection of the protective layer 40 on the display substrate is larger than the orthographic projection of the glass layer 31 on the display substrate. The orthographic projection of the glass layer 31 on the display substrate is larger than the orthographic projection of the displayable area (VA) 200 on the display substrate. A plurality of first structural holes 2 are provided in the fixing portion 310 of the glass layer 31.

[0129] In an exemplary embodiment, the cover plate layer may further include a filler layer that fills the first structural hole 2.

[0130] In an exemplary embodiment, the material of the filling layer may include an organic polymer filler material 4.

[0131] In an exemplary embodiment, the difference between the refractive index of the filler material 4 and the refractive index of the glass layer 31 can be less than or equal to 0.005. For example, the filler material can be polyimide, polyurethane, polymethyl methacrylate, etc.

[0132] This disclosure, by filling the first structural hole with an organic polymer filler material, can not only avoid the light and shadow problems caused by the structural hole, but also reduce the rebound force of the fixing part, while maintaining the bending area with extremely high impact resistance and good surface feel.

[0133] In an exemplary embodiment, ink can also be applied to the fixing part 310 so that the width of the ink area on the left, right and upper and lower parts of the fixing part 310 is equal, thereby enabling the fixing part 310 to perform the display function and extending the displayable area (VA) 200 to the fixing part 310.

[0134] This disclosure extends the displayable area (VA) 200 to the fixing part 310 by providing multiple structural holes in the fixing part 310 and filling the structural holes with a specific polymer material, thereby increasing the area of ​​the displayable area (VA) 200 and enhancing the user experience and viewing comfort.

[0135] Figure 11A-11D This is a schematic diagram illustrating a filling process for a first structural hole, as exemplified in an exemplary embodiment of the present disclosure. In an exemplary embodiment, the filling process for the structural hole may include:

[0136] (1) A mold substrate 52 is disposed on a glass carrier plate 51, and then a glass substrate 41 with a first structural hole 2, prepared by the method shown in FIG12, is disposed on the side of the mold substrate 52 away from the glass carrier plate 51. Figure 11A As shown.

[0137] (2) The first structural hole 2 is coated with filler material 53 using a scraping process, such as... Figure 11B As shown.

[0138] (3) Scrape the filler material smooth and heat to cure it, such as Figure 11C As shown.

[0139] (4) Cooling and then bonding the glass carrier plate 51 and the mold substrate 52 with the glass substrate 41 having the first structural hole 2, thus obtaining a glass substrate 41 with the first structural hole 2 filled, as shown. Figure 11D As shown.

[0140] Figures 12A-12C This is a schematic diagram illustrating another filling process for a first structural hole, which is an exemplary embodiment of the present disclosure. In an exemplary embodiment, the filling process for the first structural hole may include:

[0141] (1) A mold substrate 52 is disposed on a glass carrier plate 51, and then a glass substrate 41 with a first structural hole 2, prepared by the method shown in FIG12, is disposed on the side of the mold substrate 52 away from the glass carrier plate 51. Figure 12A As shown.

[0142] (2) The first structural hole 2 is coated with a filler material, and a mold 54 is set on the side of the glass substrate 41 with the first structural hole 2 away from the glass carrier plate 51 for coating by a pressing process, using a method such as... Figure 12B As shown.

[0143] (3) Flatten the filling material and heat it to cure.

[0144] (4) Cooling and then bonding the glass carrier plate 51, the mold substrate 52, and the upper mold 54 with the glass substrate 41 having the first structural hole 2, thus obtaining a glass substrate 41 with the first structural hole 2 filled, as shown. Figure 12C As shown.

[0145] According to this disclosure, other processes can also be used to fill structural holes with filling materials.

[0146] Figure 13 This is a schematic cross-sectional view of another glass layer according to an exemplary embodiment of this disclosure. Figure 13 As shown, corresponding to the bent and non-bent areas of the display panel, the glass layer 31 may include bent portions and non-bent portions. The bent portion may include a fixing portion 310 and a sliding portion 330. The non-bent portion may include a flat portion 320. The fixing portion 310 and the sliding portion 330 are respectively located on both sides of the flat portion 320 in the first direction X, and the fixing portion 310 can be bent from the flat portion 320 along the first direction X to the Z direction.

[0147] In an exemplary embodiment, at least one second structural hole 3 may be provided in the sliding portion 330 to enhance the bendability of the sliding portion. The second structural hole 3 may be in the form of a through hole, that is, the second structural hole 3 penetrates through the glass layer 31, and the depth of the second structural hole 3 is the same as the thickness of the sliding portion 330. The thickness of the sliding portion 330 may be in the range of greater than 200μm to 800μm, for example, in the range of 550μm-650μm.

[0148] In an exemplary embodiment, the cross-sectional shape of the fixing part 310 can be an arc shape, and the arc-shaped fixing part 310 can be formed by a three-dimensional hot bending process.

[0149] This embodiment uses glass with a thickness in the range of 200μm-800μm, which is inherently non-bending. The bendability of the glass layer is achieved by providing at least one structural hole in the sliding portion of the glass layer. On the other hand, a fixing portion of the glass layer is formed using a hot bending process. The combination of the sliding portion with the structural hole and the hot-bent fixing portion also enhances the bending performance of the sliding display substrate during bending, while simultaneously reducing the rebound force within the fixing portion at the edge area of ​​the cover window, thereby reducing the risk of peeling or separation between the film layers within the fixing portion.

[0150] In one possible exemplary embodiment, an organic polymer filler material may be disposed within the second structural pore 3. The organic polymer filler material may be selected from polymers having the same refractive index as glass or a difference in refractive index from glass less than or equal to 0.005.

[0151] This disclosure not only solves the corresponding light and shadow problem by setting a filling material in the structural hole, but also ensures that the sliding roll part has extremely high impact resistance and surface feel.

[0152] Figure 14 This is a schematic cross-sectional view of yet another glass layer according to an exemplary embodiment of the present disclosure. Figure 14 As shown, corresponding to the bent and non-bent areas of the display panel, the glass layer 31 may include bent portions and non-bent portions. The bent portion may include a fixing portion 310 and a sliding portion 330. The non-bent portion may include a flat portion 320. The fixing portion 310 and the sliding portion 330 are respectively located on both sides of the flat portion 320 in the first direction X.

[0153] In an exemplary embodiment, at least one first structural hole 2 may be provided in the fixing part 310 and at least one second structural hole 3 may be provided in the sliding part 330. The first structural hole 2 penetrates the glass layer 31 and the depth of the first structural hole 2 is the same as the thickness of the glass layer 31 in the fixing part; the second structural hole 3 penetrates the glass layer 31 and the depth of the second structural hole 3 is the same as the thickness of the glass layer 31 in the sliding part.

[0154] In one possible exemplary embodiment, both the first structural pore 2 and the second structural pore 3 may be filled with an organic polymer filler material.

[0155] This embodiment, by simultaneously providing structural holes in the fixing part and the sliding part, can not only reduce the rebound force of the fixing part, but also enhance the bendability of the sliding part.

[0156] This disclosure provides a display device that, by using both flexible and non-flexible glass as glass layers and providing structural holes in at least one flexible portion of the glass layer, including the fixing portion and the sliding portion, not only ensures the bending performance and impact resistance of the cover window in the sliding configuration, but also reduces the rebound force in the fixing portion at the edge area of ​​the cover window, thereby reducing the risk of peeling or separation between the film layers in the fixing portion.

[0157] The display device disclosed herein may also include various combinations and arrangements of various perforated glass layers and other components of the display panel according to exemplary embodiments of the present disclosure, which will not be elaborated here.

[0158] The display device provided in the exemplary embodiments of this disclosure can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0159] While the embodiments disclosed herein are as described above, the content is merely for the purpose of facilitating understanding of this disclosure and is not intended to limit this disclosure. Any person skilled in the art to which this disclosure pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection of this disclosure shall still be determined by the scope defined in the appended claims.

Claims

1. A display panel, comprising a fixed area, a flat display area, and a sliding area, wherein the fixed area and the sliding area are respectively located on both sides of the flat display area in a first direction, the fixed area is configured to be fixedly connected to a mid-frame, the flat display area is configured to display an image, and the sliding area is configured to form a rolled-up state and an extended state by sliding, wherein in the extended state, it displays an image together with the flat display area, and on a plane perpendicular to the display panel, the display panel includes at least a display substrate, an adhesive layer disposed on the display substrate, and a cover layer disposed on the adhesive layer on a side away from the display substrate, the cover layer including at least a glass layer, and at least one of the glass layer of the fixed area and the glass layer of the sliding area is provided with at least one structural hole, the structural hole being a strip shape extending along a second direction, wherein the first direction and the second direction intersect. in, The structural hole includes a first structural hole disposed in the glass layer of the fixed region. The depth of the first structural hole is the same as the thickness of the glass layer of the fixed region, and the thickness of the glass layer of the fixed region is 50 μm to 200 μm.

2. The display panel according to claim 1, wherein the thickness of the glass layer in the sliding area is 25 μm to 80 μm.

3. The display panel according to claim 1, wherein, The structural hole also includes a second structural hole, which is disposed in the glass layer of the sliding zone. The depth of the second structural hole is the same as the thickness of the glass layer in the sliding zone, and the thickness of the glass layer in the sliding zone is 200 μm to 800 μm.

4. The display panel according to claim 1, wherein, On a plane perpendicular to the display panel, the cross-sectional shape of the glass layer in the fixing area is arc-shaped, and the arc-shaped glass layer in the fixing area is formed by a three-dimensional hot bending process.

5. The display panel according to claim 1, wherein, The cover plate layer also includes a filler layer that fills the structural holes.

6. The display panel according to claim 5, wherein, The filling layer is made of organic polymer materials.

7. The display panel according to claim 5, wherein, The difference between the refractive index of the filling layer material and the refractive index of the glass layer is less than or equal to 0.

005.

8. The display panel according to any one of claims 1 to 7, wherein, The structural hole has a length in the second direction and a width in the first direction, wherein the length is greater than the width.

9. The display panel according to claim 8, wherein, In the second direction, the structural hole includes a first end, a second end, and a main body portion between the first end and the second end. On a plane parallel to the display panel, the main body portion is a strip shape extending along the second direction, and the first end and the second end are semi-circular in shape.

10. The display panel according to claim 9, wherein, The main body includes an end region near the first end and the second end and a middle region away from the first end and the second end, wherein the width of the middle region is less than or equal to the width of the end region.

11. The display panel according to claim 10, wherein, The width of the main body gradually increases from the middle region to the end region.

12. The display panel according to claim 11, wherein, The width of the middle region is 30% to 70% of the width of the end region.

13. The display panel according to claim 8, wherein, The structural hole includes a plurality of hole columns arranged sequentially along the first direction, and the hole column includes a plurality of structural holes arranged sequentially along the second direction; The plurality of hole columns include a plurality of odd hole columns and a plurality of even hole columns. The structural holes in the plurality of odd hole columns are aligned in the second direction, and the structural holes in the plurality of even hole columns are aligned in the second direction. The structural holes in the odd hole columns and the structural holes in the even hole columns are staggered in the second direction.

14. The display panel according to claim 13, wherein, The centerline of at least one of the structural holes in the odd-numbered hole columns has a first spacing with the centerline of the structural holes in the adjacent even-numbered hole columns in the first direction, the first spacing being 0.5 to 3 times the width, and the centerline being a line passing through the geometric center of the structural hole along the second direction.

15. The display panel according to claim 14, wherein, In at least one adjacent row of structural holes, the structural holes in the second direction have a second spacing, the second spacing being 10% to 30% of the length.

16. The display panel according to claim 13, wherein, The center point of at least one of the structural holes in the odd-numbered hole columns has a misalignment distance with the center points of the structural holes in the adjacent, staggered even-numbered hole columns in the first direction. The misalignment distance is 40% to 60% of the length, and the center point of the structural hole is the geometric center of the structural hole.

17. A display device comprising a display panel according to any one of claims 1 to 16.

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