Display panel and display device

Abstract

The invention provides a display panel and a display device. A flexible substrate in the display panel is in patterned design and comprises a hole digging area and a reserved area which penetrate through a flexible substrate film; the hole digging region can be arranged below the thin film transistor device in the first display region, so that the influence of a charge effect of a flexible substrate material caused by a polarization phenomenon on the characteristics of the thin film transistor device is solved; the hole digging area can also be arranged in the second display area, so that the optical transmittance of the second display area can be improved, and the problem that a camera arranged below the second display area becomes yellow is solved; the patterned flexible substrate has the advantages that the bendability of the display panel is enhanced, the stress in the bending process of the display panel is released, the film layer is prevented from being broken in the bending process, and the yield of the display panel is improved.

Description

Technical Field

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

[0002] With the rapid development of modern display technology, the field of display technology is developing towards lighter, thinner, softer and more transparent. In order to improve its bending performance and improve its mechanical properties, it is often necessary to use flexible polyimide (PI) as a flexible substrate. Because PI contains fluorine elements, etc., it is easy to polarize under pressure, thereby generating a PI charge effect. As a result, the device characteristics of the thin film transistor (TFT) drift, which is mainly reflected in the drift of the threshold voltage. The threshold voltage drift will cause device inhomogeneity, resulting in uneven screen color brightness, black fog and other display defects. On the other hand, PI Charge is difficult to recover, resulting in the deterioration of the screen's residual image. Therefore, it is necessary to eliminate the PI Charge effect and improve the stability and uniformity of the device. In order to eliminate the PI Charge effect, the previous solution is to set a metal layer under the TFT device to shield the PI Charge, and on the other hand, connect the metal layer to the drain electrode to provide a stable voltage. However, the increase in the metal layer increases the steps and costs of product manufacturing. The present invention provides a simple structure to solve the PI Charge effect.

[0003] On the other hand, the low transmittance and yellowing problem of the flexible substrate will affect the photographic effect of the under-screen camera technology of the display panel. The present invention provides a simple structure to solve the low transmittance and yellowing problems of the under-screen camera area.

[0004] On the other hand, during the bending or folding process, stress concentration occurs in the bending area of ​​the flexible substrate and the display panel, which can easily cause cracks in the film layer and metal wiring. The present invention provides a simple structure that can release the stress in the bending area during the bending process and protect the display panel. Summary of the invention

[0005] The embodiments of the present application provide a display panel and a display device, which can eliminate the instability and non-uniform characteristics of the device caused by the PI Charge effect.

[0006] It can also solve the problems of low transmittance and yellowing in the under-screen camera area.

[0007] It can also release the stress in the bending area during the bending process and protect the display panel.

[0008] An embodiment of the present application provides a display panel, comprising:

[0009] A flexible substrate and a thin film transistor array layer provided on the flexible substrate;

[0010] The flexible substrate forms a patterned design, and the flexible substrate includes a plurality of reserved areas and penetrating hole areas;

[0011] The area of ​​the entire hole-digging region accounts for 1%-50% of the area of ​​the entire flexible substrate.

[0012] Optionally, in some embodiments of the present application, a first display area is further included;

[0013] In the first display area, the thin film transistor array layer includes a plurality of thin film transistor device areas distributed in an array, and the thin film transistor device area has an active layer area and a gate;

[0014] The hole-digging area is arranged below the active layer area, wherein the projection of the gate on the flexible substrate falls within the hole-digging area.

[0015] Optionally, in some embodiments of the present application, in the first display area, a ratio of an area of ​​the hole area corresponding to the first display area to an area of ​​the flexible substrate corresponding to the first display area is S1, and 0.01≤S1≤0.1.

[0016] Optionally, in some embodiments of the present application, a second display area may also be included;

[0017] The light transmittance of the second display area is higher than that of the first display area;

[0018] In the second display area, a value of a ratio of an area of ​​the hole area corresponding to the second display area to an area of ​​the flexible substrate corresponding to the second display area is S2, and S1≤S2≤1.

[0019] Optionally, in some embodiments of the present application, a bending region (B) is further included;

[0020] In the bending area, the bending direction is set as the first direction, and the long side direction of the hole-digging area is set as the second direction, wherein the first direction is perpendicular to the second direction.

[0021] Optionally, in some embodiments of the present application, in the bending zone, the ratio of the area of ​​the hole area corresponding to the bending zone to the area of ​​the flexible substrate corresponding to the upper bending zone is S3, and 0.1≤S3≤0.5.

[0022] Optionally, in some embodiments of the present application, the flexible substrate has a single-layer flexible substrate film structure;

[0023] Alternatively, the flexible substrate has a structure in which flexible substrate films and inorganic films are alternately stacked.

[0024] Optionally, in some embodiments of the present application, the patterned hole area is a through hole that penetrates the flexible substrate film, and the shape may be circular, square, or the like.

[0025] Optionally, in some embodiments of the present application, the thin film transistor array layer includes a buffer layer disposed on a flexible substrate, wherein a portion of the buffer layer is filled in the hole area.

[0026] The present application also proposes a display device, which includes the above-mentioned display panel.

[0027] Beneficial effects:

[0028] The present application discloses a display panel and a display device; the display panel comprises a flexible substrate, a thin film transistor array layer arranged on the flexible substrate, and a display layer arranged on the thin film transistor array layer; wherein the thin film transistor array layer has a thin film transistor device area, and the device area has an active layer area and a gate; the flexible substrate forms a patterned design, and the flexible substrate comprises a plurality of reserved areas and a through-hole area;

[0029] The present application designs a hole in the active layer area corresponding to the flexible substrate below, and the projection area of ​​the hole area on the active layer area is larger than the projection area of ​​the gate on the active layer area, thereby avoiding the polarization charge effect formed by PI under the pressurized electric field from interfering with the gate voltage, thereby causing the TFT device characteristics to shift, affecting the display unevenness, and improving the display uniformity effect.

[0030] The present application can also be designed by making a hole design for the flexible substrate below the second display area (camera area under the screen), and the ratio of the area of ​​the hole area corresponding to the second display area to the corresponding flexible substrate is greater than the ratio of the area of ​​the hole area corresponding to the first display area to the corresponding flexible substrate, thereby avoiding the phenomenon that the front camera effect in this area is yellowish due to the low transmittance of the second display area, thereby improving the front camera effect.

[0031] The present application can also alleviate the problem of film cracks caused by stress concentration during the bending process by making a hole design in the bending area corresponding to the flexible substrate below, and designing the long side direction of the hole area perpendicular to the bending direction, thereby improving the yield and reliability of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0033] Figure 1 A cross-sectional view of a display panel provided in an embodiment of the present application;

[0034] Figure 2 A top view of a first display area of ​​a display panel provided in an embodiment of the present application;

[0035] Figure 3 A top view of a first display area and a second display area of ​​a display panel provided in an embodiment of the present application;

[0036] Figure 4 A top view of a bending area of ​​a display panel provided in an embodiment of the present application;

[0037] Figure 5 A top view of a display panel provided in an embodiment of the present application;

[0038] Figure 6 A cross-sectional view of a flexible substrate for a display panel provided in an embodiment of the present application;

[0039] Figure 7 Schematic diagram of different shapes of flexible substrates for display panels provided in embodiments of the present application;

[0040] Figure 8 A cross-sectional view of a display panel buffer layer entering a hole-digging area provided in an embodiment of the present application;

[0041] Fig. 9 A schematic diagram of a preparation process of a display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 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, the various embodiments can be combined with each other but will not be repeated one by one, and in the absence of contrary instructions, the directional words used, such as "upper" and "lower", usually refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device; the terms "first", "second", "third", etc. are used only as markings, and no numerical requirements are imposed or order is established.

[0043] The embodiments of the present application provide a display panel and a display device, which are described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0044] See also Figure 1An embodiment of the present application provides a display panel, which includes a flexible substrate 30, a thin film transistor (TFT) array layer 40 disposed on the flexible substrate 30, and a display layer 50 disposed on the TFT array layer 40.

[0045] The flexible substrate 30 is patterned and includes a plurality of reserved areas 31 and a through-hole area 32 , wherein the area of ​​the entire hole area 32 accounts for 1%-50% of the area of ​​the entire flexible substrate 30 .

[0046] It should be understood that the flexible substrate is usually made of PI material, and the characteristics of PI are good support and strong folding performance; however, it is easy to produce polarized electric field phenomenon under the action of electric field, thus affecting the characteristics of TFT devices; at the same time, the PI body turns yellow, thus affecting the display effect after visible light passes through PI; therefore, the patterned PI design can overcome the above adverse effects and improve the display effect of the display panel. At the same time, in order to take into account the supporting performance, the area of ​​the entire hole area 32 accounts for 1%-50% of the area of ​​the entire flexible substrate 30. For example, it can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 20%, 30%, 40%, 50%. Based on the consideration of supporting strength, the area ratio is preferably between 1% and 5%.

[0047] The TFT array layer 40 has a TFT device area H, which includes an active layer area T1 and a gate T2; the display panel also includes a first display area A1 and a peripheral wiring area W. When in the first display area A1, the hole area 32 is located below the active layer area T1, and the projection area of ​​the hole area 32 on the active layer area T1 is larger than the projection area of ​​the gate T2 on the active layer area T1.

[0048] It should be understood that the projection area of ​​the hole area 32 of the flexible substrate (usually PI material) on the active layer area T1 is set to be larger than the projection area of ​​the gate T2 on the active layer area T1. In the working state, there will be an external electric field in the TFT device area H. At this time, there is no PI flexible substrate under the gate T2 under the action of the electric field, so no PI polarization effect will be generated, thereby avoiding the gate voltage from being affected by the charge and ensuring the uniformity of the display panel.

[0049] Optionally, in some embodiments of the present application, the TFT array layer 40 is generally used as a backplane of a display panel, and the display panel is controlled to turn on and off by voltage or current.

[0050] Optionally, in some embodiments of the present application, the display layer 50 may include an anode layer 51 disposed on the TFT array layer 40, a pixel definition layer 52 disposed on the anode layer 51 and forming a pixel opening, the pixel definition layer 52 including a plurality of pixel openings corresponding one to the anode layer 51, and each of the pixel openings corresponding to an upper surface of the anode exposed, an organic functional layer 53 disposed on the anode layer 51 corresponding to the pixel opening, and a cathode layer 54 disposed on the organic functional layer 53.

[0051] It can be understood that the organic functional layer 53 on the display layer 50 can be electrically driven by the TFT array layer to pass current, and under the action of the current, the organic light-emitting material performs autonomous light-emitting display.

[0052] Optionally, in some embodiments of the present application, the display panel can be manufactured on a transparent substrate 10 and peeled off from the transparent substrate 10 after manufacturing, thereby achieving a flexible display function and lightness and thinness.

[0053] Optionally, in some embodiments of the present application, please refer to Figure 2 In the first display area A1, the area of ​​the hole area 321 corresponding to the first display area is ratioed to the area of ​​the flexible substrate 301 corresponding to the first display area by S1, and S1 is between 0.01 and 0.1, for example, it can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, or 0.1.

[0054] It is understandable that the larger the area of ​​the hole region 321 is, the less PI polarization effect will be produced under the action of the external electric field, and the more uniform the display effect will be; but an excessively large area of ​​the hole region 321 will cause the supporting performance of the flexible substrate 301 to be weakened, and will simultaneously cause defects in the manufacturing process.

[0055] Optionally, in some embodiments of the present application, in the display panel, the area of ​​the entire hole region 32 accounts for a ratio of 1% to 5% of the entire flexible substrate 30 , which can improve the display effect while achieving good support.

[0056] Optionally, in some embodiments of the present application, please refer to Figure 3 The display panel further includes a second display area A2, wherein the optical transmittance of the second display area A2 is greater than that of the first display area A1.

[0057] It is understandable that normal display units can also be distributed in the second display area A2. Usually, the second display area A2 is used as the front camera configuration area (Camera Under Panel, CUP) of the whole machine, so the transmittance in the visible light band of 380-780nm is required to be as high as possible. Excessive yellow light transmission will cause the front camera effect to turn yellow. Therefore, PI patterning design in the second display area A2 can also improve the optical transmittance, reduce the yellowing problem of PI itself, and effectively improve the front camera effect.

[0058] Optionally, in the above embodiment, in the second display area A2, the area of ​​the hole area 322 corresponding to the second display area A2 is ratioed to the area of ​​the flexible substrate 302 corresponding to the second display area A2 by S2, and S2 is between S1 and 1, for example, it can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.

[0059] It can be understood that the larger the area of ​​the hole area 322, the greater the optical transmittance of the corresponding area, and the less the yellowing of the PI affects the under-screen camera, thereby improving the front camera effect; at the same time, since the second display area A2 occupies a very small proportion of the area of ​​the entire display panel, even if the entire flexible substrate PI in the second display area A2 is removed, it will not cause the problem of insufficient support of the overall structure, so that S2 can be a maximum of 1. At this time, the PI in the entire second display area is completely removed, and the front camera effect is most obviously improved.

[0060] Optionally, the flexible substrate 302 may also be made of transparent PI or transparent PET and other materials. In this case, the optical transmittance of the second display area A2 is already very high, and there is no yellowing problem. Therefore, in the second display area A2, it is only necessary to set the hole area 322 below the gate T2 with reference to the first display area, so as to eliminate the influence of the electric field charge effect and improve the display uniformity in the second display area A2. At this time, S2 can be as small as S1.

[0061] Optionally, in some embodiments of the present application, in the display panel, the area of ​​the entire hole region 32 accounts for a ratio of the entire flexible substrate 30 area set between 1% and 10%, which can improve the display effect and the front camera effect while achieving good support.

[0062] Optionally, in some embodiments of the present application, please refer to Figure 4 The display panel also includes a bending area B located in the middle of the panel. The flexible substrate 303 in the bending area B includes a hole area 323 to form a patterned design. The bending direction is set to a first direction Y, and the long side direction of the hole area 323 is set to a second direction X, wherein the first direction Y and the second direction X are perpendicular to each other.

[0063] It can be understood that the display panel can be bent up and down in the first direction Y. During the bending process, the stress of the film layer will increase in the bending area B, which may easily cause defects such as film breakage. The patterned flexible substrate 303 can effectively absorb the film layer stress generated during the bending process and protect the various film layers of the display panel, especially the relatively fragile inorganic film layers and metal film layers. The long side direction of the hole area 323 is perpendicular to the bending direction, which is beneficial to the stress release during the bending process and achieves the best protection effect.

[0064] It should be noted that the length of the long side of a single hole in the hole-digging area 323 and the spacing between two adjacent holes in the X / Y direction are determined comprehensively based on the bending radius and stress simulation, etc. In some embodiments, when the bending radius R is between 0.15 mm and 0.3 mm, the length of the long side of the hole-digging area 323 is set between 4 mm and 20 mm, for example, it can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 15 mm, 20 mm, etc., and the spacing between two adjacent holes in the X direction is 10 mm, 15 mm, 20 mm, etc. The spacing is set between 0.1mm and 0.8mm, for example, it can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc. The spacing between two adjacent holes in the Y direction is set between 0.1mm and 0.25mm, for example, it can be 0.1mm, 0.13mm, 0.15mm, 0.17mm, 0.2mm, 0.23mm, 0.25mm, etc. At this time, the simulated bending stress is small.

[0065] Optionally, in some embodiments of the present application, in the bending zone B, the area of ​​the hole area 323 corresponding to the bending zone B is S3 compared to the area of ​​the flexible substrate 303 corresponding to the upper bending zone, and S3 is between 0.1 and 0.5, for example, it can be 0.1, 0.2, 0.3, 0.4, or 0.5.

[0066] It is understandable that the larger the area of ​​the hole area 323 is, the more conducive it is to stress release during the bending process. However, an excessively large area of ​​the hole area 323 will cause the shape of the flexible substrate 303 to be uncontrolled during the bending process, and at the same time the supporting performance of the flexible substrate 303 will be weakened, which will simultaneously cause defects in the process.

[0067] Optionally, in some embodiments of the present application, in the display panel, the area of ​​the entire hole region 32 accounts for a ratio of 5% to 50% of the area of ​​the entire flexible substrate 30, which can improve stress concentration during the bending process while achieving good support.

[0068] Optionally, in some embodiments of the present application, please refer to Figure 5The display panel can include a first display area A1, a second display area A2, and a bending area B at the same time. In the corresponding three areas, the flexible substrate 30 has hole areas 32 respectively to form respective pattern designs, which can alleviate the electrical drift of TFT devices caused by electric field effects, increase the photo-taking effect of the front camera, and alleviate stress during the bending process.

[0069] Optionally, in some embodiments of the present application, please refer to Figure 6 In the middle figure (A), the flexible substrate 30 has a single-layer flexible substrate film 30A structure; or, please refer to Figure 6 In the middle figure (B), the flexible substrate 30 has a structure in which flexible substrate films 30A and inorganic films 30B are alternately stacked, wherein the inorganic films include silicon nitride, silicon oxide, or a silicon oxynitride composite.

[0070] It can be understood that the flexible substrate 30 must have supporting performance, certain bending performance and thermal stability, so organic materials PI and PET with high heat resistance and good bending performance are often selected as the single-layer flexible substrate film 30A structure; at the same time, the flexible substrate also has a certain water and oxygen barrier ability, which can better protect the display panel from being corroded by water and oxygen, so usually a layer of inorganic film 30B is added between the two layers of organic flexible substrate film 30A to form a structure in which organic and inorganic layers are alternately arranged, thereby increasing the water and oxygen barrier ability and better protecting the display panel.

[0071] It should be noted that when the flexible substrate 30 is a structure in which a flexible substrate film 30A and an inorganic film 30B are alternately stacked, the hole area 32 set on the flexible substrate 30 is a through hole penetrating the flexible substrate film 30A, and the inorganic film 30B is not holed, thereby ensuring the integrity of the inorganic film and effectively blocking water and oxygen.

[0072] Optionally, in some embodiments of the present application, please refer to Figure 7 The hole area 32 on the flexible substrate 30 is a through hole that penetrates the flexible substrate film 30A, and the shape of the hole area 32 in the top view can be set to a circular, square, ring or other shape, and the shapes of different areas can be set differently to meet the specific functional requirements of different areas.

[0073] Optionally, in some embodiments of the present application, the flexible substrate may be a polyimide or polyethylene terephthalate material with a photosensitive agent. These organic materials with a photosensitive agent facilitate the subsequent production of the hole area through exposure and development.

[0074] Optionally, in some embodiments of the present application, please refer to Figure 8The thin film transistor array layer 40 also includes a buffer layer 41, which is arranged on the flexible substrate 30 to adjust stress and block water and oxygen. The buffer layer 41 is a single-layer or multi-layer inorganic stacked structure. The inorganic material includes silicon nitride, silicon oxide, silicon oxynitride composition, etc., and part of the buffer layer 41 will be filled into the hole area 32 of the flexible substrate 30.

[0075] It can be understood that the buffer layer 41 is produced by deposition on the flexible substrate 30. Due to the existence of the opening area 32 on the flexible substrate, part of the buffer layer 41 will enter the opening area 32. Within a certain range, it will not cause structural failure and process defects. At the same time, it also has the effect of blocking water and oxygen, thereby ensuring the smooth production of subsequent film layers.

[0076] Optionally, in some embodiments of the present application, please refer to Figure 8 , the display panel can be prepared by the following steps:

[0077] Step 1: Deposit a peeling layer 20 on a transparent substrate 10, wherein the transparent substrate may be made of glass, quartz or polyimide, etc., and serves as a base, and the peeling layer is an inorganic film structure, and the composition may be a-Si, and the thickness is The peeling layer can facilitate the subsequent peeling of the display panel from the transparent substrate 10 ; the flexible substrate 30 is manufactured by coating on the peeling layer.

[0078] Step 2: Exposure, development, etching, etc. are performed on the flexible substrate to pattern the hole area 32 and the reserved area 31.

[0079] Step 3: a buffer layer 41 is formed on the patterned flexible substrate by deposition, and the buffer layer 41 will partially fill the hole area 32 .

[0080] Step 4: The remaining TFT array layer 40 and display layer 50 are sequentially formed on the buffer layer.

[0081] The present application also proposes a display device, which includes a terminal body and the above-mentioned display panel, wherein the terminal body and the display panel are combined into one. The terminal body can be a device such as a circuit board bound to the display panel. The various products include, for example, televisions, notebook computers, monitors, billboards, Internet of Things (IoT) devices, and portable electronic devices including mobile phones, smart phones, tablet personal computers, mobile communication terminals, electronic notebooks, e-books, portable multimedia players (PMPs), navigation, and ultra-mobile personal computers (UMPCs).

[0082] In addition, the display device according to some embodiments may be applied to a wearable device and may be used in a wearable device, including a smart watch, a watch phone, a glasses-type display, and a head-mounted display (HMD). In addition, according to some embodiments, the display device may be applied to an instrument panel of a car, a display screen in a central dashboard of a car or a central information display (CID) arranged on the dashboard, an interior mirror display replacing a side mirror of a car, and a display of an entertainment system arranged on the back of a front seat for rear seat passengers in a car.

[0083] The present application discloses a display panel and a display device; the display panel includes a flexible substrate 30, a TFT array layer 40 arranged on the flexible substrate 30, and a display layer 50 arranged on the TFT array layer 40; wherein the TFT array layer 40 has a TFT device area H, and the device area has an active layer area T1 and a gate T2; the flexible substrate 30 includes a plurality of reserved areas 31 and a hole area 32; the present application makes the TFT array layer 40 corresponding to the flexible substrate PI below for hole design, and the hole area is larger than the area corresponding to the gate T2 in the device area, thereby avoiding the polarization electric field effect formed by PI under the pressurized electric field to interfere with the gate T2 voltage, thereby causing the TFT device characteristics to be offset, affecting the display unevenness phenomenon, and improving the display uniformity effect. The present application can also make the second display area A2 (camera area under the screen) corresponding to the flexible substrate below for hole design, and the hole area ratio is greater than the ratio design of the first display area, thereby avoiding the phenomenon that the front camera effect in the area is yellowish due to the low transmittance of the second display area A2, thereby improving the front camera effect. The present application can also alleviate the problem of film cracks caused by stress concentration during the bending process by making a hole design in the bending area B corresponding to the flexible substrate below, and designing the long side direction of the hole area perpendicular to the bending direction, thereby improving the yield and reliability of the display panel.

[0084] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0085] The above is a detailed introduction to a display panel, a display device, and a mobile 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 technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display panel, characterized in that: include: A flexible substrate and a thin film transistor array layer provided on the flexible substrate; The flexible substrate forms a patterned design, and the flexible substrate includes a plurality of reserved areas and penetrating hole areas; The area of ​​the entire hole-digging region accounts for 1%-50% of the area of ​​the entire flexible substrate.

2. The display panel according to claim 1, wherein: comprising a first display area; In the first display area, the thin film transistor array layer includes a plurality of thin film transistor device areas distributed in an array, and the thin film transistor device area has an active layer area and a gate; The hole-digging area is arranged below the active layer area, wherein the projection of the gate on the flexible substrate falls within the hole-digging area.

3. The display panel according to claim 2, wherein: In the first display area, a value of a ratio of an area of ​​the hole area corresponding to the first display area to an area of ​​the flexible substrate corresponding to the first display area is S1, and 0.01≤S1≤0.

1.

4. The display panel according to claim 3, wherein: A second display area may also be included; The light transmittance of the second display area is higher than that of the first display area; In the second display area, a value of a ratio of an area of ​​the hole area corresponding to the second display area to an area of ​​the flexible substrate corresponding to the second display area is S2, and S1≤S2≤1.

5. The display panel according to claim 1, wherein: It also includes a bending area; In the bending area, a bending direction is set as a first direction, and a long side direction of the hole-digging area is set as a second direction, wherein the first direction is perpendicular to the second direction.

6. The display panel according to claim 5, wherein: In the bending area, a value of a ratio of an area of ​​the hole area corresponding to the bending area to an area of ​​the flexible substrate corresponding to the bending area is S3, and 0.1≤S3≤0.

5.

7. The display panel according to claim 1, wherein: The flexible substrate has a single-layer flexible substrate film structure; Alternatively, the flexible substrate has a structure in which flexible substrate films and inorganic films are alternately stacked.

8. The display panel according to claim 7, wherein: The patterned hole-digging area is a through hole penetrating the flexible substrate film, and the shape of the through hole is circular or square.

9. The display panel according to claim 1, wherein: The thin film transistor array layer includes a buffer layer disposed on the flexible substrate, wherein the hole area is partially filled with the buffer layer.

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 9.

Images