Display device

Abstract

The invention discloses a display device. The display device comprises a display panel, a polaroid, an optical adhesive layer and a cover plate which are sequentially stacked, a plurality of pressure sensing units are arranged on one surface, close to the polaroid, of the display panel; a plurality of patterned structures protruding towards the optical adhesive layer are arranged on the face, close to the optical adhesive layer, of the cover plate. The plurality of patterned structures are arranged corresponding to the plurality of pressure sensing units; the optical adhesive layer comprises a first part and a second part, the first part is a part corresponding to the plurality of patterned structures, and the rest part is the second part; the thickness of the first part is smaller than that of the second part. The display panel has the advantages that the protruding structures corresponding to the pressure sensing units are arranged on the binding face of the display panel, so that the thickness of OCA or OCR in the areas corresponding to the protruding structures is reduced, absorption of the OCA or OCR to force is reduced, the lagging and creep characteristics of the OCA or OCR are improved, and finally the signal-to-noise ratio and stability of pressure sensing signals are improved.

Description

Technical Field

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

[0002] At present, the display devices of electronic devices such as smart phones have integrated pressure sensing units in their display panels to realize the touch function of the display devices. Due to the extremely thin film layer of the display panel, the deformation generated when pressing the display panel is small, which leads to the relatively weak corresponding electrical signal. In addition, due to the interference of the thicker module, the actual signal-to-noise ratio (SNR) is extremely low.

[0003] However, due to the low modulus of the optical adhesive layer (OCA) or liquid optical adhesive layer (OCR) in the display device, there are mechanical hysteresis and creep characteristics when under pressure. Therefore, the optical adhesive layer or liquid optical adhesive layer will absorb most of the force from the cover plate; at the same time, mechanical hysteresis and creep will cause inconsistent deformation of the force during loading and unloading, and zero drift will occur after multiple cycles. This will lead to an extremely low and unstable signal-to-noise ratio of the pressure-sensing signal. Summary of the invention

[0004] In order to solve the problem that the signal-to-noise ratio of a pressure-sensitive signal of a display device is low and unstable, an object of the present invention is to provide a display device.

[0005] In one aspect, the present invention provides a display device, comprising a display panel, a polarizer, an optical adhesive layer and a cover plate stacked in sequence;

[0006] A plurality of pressure sensing units are provided on a surface of the display panel close to the polarizer;

[0007] A patterned structure protruding toward the optical adhesive layer is provided on a side of the cover plate close to the optical adhesive layer;

[0008] The patterned structure is arranged corresponding to the plurality of pressure sensing units;

[0009] The optical adhesive layer includes a first portion and a second portion, the first portion is a portion corresponding to the plurality of patterned structures, and the remaining portion is the second portion;

[0010] The thickness of the first portion is smaller than the thickness of the second portion.

[0011] As an implementation manner of the present invention, the orthographic projection of the patterned structure on the display panel covers the plurality of pressure sensing units.

[0012] As an embodiment of the present invention, the patterned structure includes a plurality of protrusions, the orthographic projections of the plurality of protrusions on the display panel respectively cover the plurality of pressure-sensing units, and the shape of the protrusions is circular.

[0013] As an embodiment of the present invention, the patterned structure includes a plurality of protrusions, the orthographic projection of each protrusion on the display panel covers a row or a column of pressure-sensitive units among the plurality of pressure-sensitive units, and the shape of the protrusion is a long strip.

[0014] As an embodiment of the present invention, the thickness of the first part is 12%-50% of the thickness of the second part.

[0015] As an embodiment of the present invention, the thickness of the first part is 10 μm-100 μm, and the thickness of the second part is 25 μm-200 μm.

[0016] As an embodiment of the present invention, the thickness of the first part is 10 μm-50 μm, and the thickness of the second part is 50 μm-150 μm.

[0017] As an implementation manner of the present invention, an included angle α between the peripheral side surface of the protrusion and the optical adhesive layer is less than 10°.

[0018] As an implementation manner of the present invention, an included angle α between the peripheral side surface of the protrusion and the optical adhesive layer is less than 8°.

[0019] As an embodiment of the present invention, the processing technology of the patterned structure includes one or more of CNC machining, plasma etching and laser ablation.

[0020] As an implementation manner of the present invention, the pressure sensing unit is a capacitive pressure sensor or a resistive pressure sensor.

[0021] As an embodiment of the present invention, the plurality of patterned structures are disposed in a non-display area of ​​the display device.

[0022] In another aspect, the present invention provides an electronic device, comprising the display device as described above.

[0023] The beneficial effects of the present invention are as follows: by providing a protruding structure corresponding to the pressure sensing unit on the bonding surface of the display panel, the thickness of the OCA or OCR in the area corresponding to the protruding structure is reduced, the absorption of force by the OCA or OCR is reduced, the hysteresis and creep characteristics thereof are improved, and finally the signal-to-noise ratio and stability of the pressure sensing signal are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0025] Figure 1 A schematic diagram of a layer structure of a display device according to an exemplary embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a layer structure of a display device according to another exemplary embodiment of the present invention;

[0027] Figure 3 A schematic diagram of a layer structure of a display device according to another exemplary embodiment of the present invention;

[0028] Figure 4 for Figure 1 A cross-sectional view of the display device.

[0029] In the figure,

[0030] 10. Cover plate; 101. Patterned structure; 20. Optical adhesive layer; 201. First part; 202. Second part; 30. Polarizer; 40. Display panel; 401. Pressure sensing unit. DETAILED DESCRIPTION

[0031] In the related art, based on the principle of flat capacitor or Wheatstone bridge, the deformation of the material under stress can be converted into an electrical signal, thereby realizing capacitive or resistive pressure sensing. Accordingly, capacitive pressure sensing or resistive pressure sensing can be applied to the display device of the electronic device.

[0032] For example, by setting a double-layer metal plate capacitor in the touch layer of the display device, the capacitive pressure sensing unit can be integrated in the display panel. Pressing the display device causes the cover plate to deform, and the deformation of the cover plate causes the capacitance to change. The pressure of the cover plate can be obtained through the capacitance change. Finally, the electronic device is controlled according to the pressure information obtained.

[0033] For another example, by setting a high strain sensitivity coefficient polysilicon (Poly) or indium gallium zinc oxide (IGZO) bridge in the active layer of the display device, the integration of resistive pressure sensing units can be realized in the display panel. Pressing the display device causes the cover plate to deform, and the deformation of the cover plate causes the polysilicon or indium gallium zinc oxide bridge circuit to deform. The pressure of the cover plate can be obtained through the change of the bridge circuit. Finally, the electronic device is controlled according to the pressure information obtained.

[0034] Due to the extremely thin thickness of the cover plate, the electrical signal generated by its deformation is relatively weak. At the same time, since there is an optical adhesive layer with a low modulus (for example, the modulus after curing is less than 150kPa) between the cover plate and the pressure-sensitive unit, there are characteristics such as mechanical hysteresis and creep when subjected to force. When the cover plate is under pressure, the optical adhesive layer will absorb most of the external force from the cover plate; and due to the mechanical hysteresis and creep characteristics, it will cause inconsistent deformation during the loading or unloading of force, and zero drift and other problems will occur after multiple cycles. Ultimately, the signal-to-noise ratio (SNR) of the pressure-sensitive signal of the display device is extremely low and unstable.

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, in the description of the present invention, the terms used are only for illustrative purposes and are not intended to limit the scope of the present invention. The terms "include" and / or "comprise" are used to specify the existence of the elements, steps, operations and / or components, but do not exclude the existence or addition of one or more other elements, steps, operations and / or components. The terms "first", "second" and the like may be used to describe various elements, do not represent the order, and do not limit these elements. In addition, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is two and more than two. These terms are only used to distinguish one element from another element. In conjunction with the following drawings, these and / or other aspects become apparent, and it is easier for a person of ordinary skill in the art to understand the description of the embodiments of the present invention. The accompanying drawings are used to describe the embodiments of the present invention for illustrative purposes only. Those skilled in the art will easily recognize from the following description that, without departing from the principles of the present invention, alternative embodiments of the structures and methods shown in the present invention can be adopted.

[0038] like Figure 1 As shown, Figure 1 Schematic diagram of the layer structure of a display device according to an embodiment of the present invention. Figure 1The X-axis direction is the length direction of the display device, the Y-axis direction is the width direction of the display device, and the Z-axis direction is the thickness direction of the display device. The display device includes a display panel 40, a polarizer 30, an optical adhesive layer 20 and a cover plate 10 stacked in sequence from bottom to top along the thickness direction.

[0039] A plurality of pressure-sensitive units 401 are provided on a surface of the display panel 40 close to the polarizer 30; a patterned structure 101 protruding toward the optical adhesive layer 20 is provided on a surface of the cover plate 10 close to the optical adhesive layer 20; the patterned structure 101 is arranged corresponding to the plurality of pressure-sensitive units 401; the optical adhesive layer 20 includes a first portion 201 and a second portion 202, the first portion 201 being a portion corresponding to the patterned structure 101, and the remaining portion being the second portion 202; the thickness of the first portion 201 is less than the thickness of the second portion 202.

[0040] Among them, the cover plate 10 is located at the top layer of the display device, and is used to protect the display device to prevent water or dust from entering the display device. The cover plate 10 is, for example, a transparent glass cover plate or a transparent resin cover plate. The optical adhesive layer 20 is located between the cover plate 10 and the polarizer 30, and is used to bond the cover plate 10 and the polarizer 30. The optical adhesive layer 20 is, for example, optical adhesive (OCA) or liquid optical adhesive (OCR), which has good light transmittance. The polarizer 30 is located between the optical adhesive layer 20 and the display panel 40, and is used to control the transmission direction of light so that the display device can display a clear image. The display panel 40 is provided at the bottom layer of the display device, and is used for displaying and controlling the display device. The display panel 40 is, for example, a flexible material such as resin.

[0041] Specifically, Figure 1 and Figure 4 As shown, Figure 4is a cross-sectional view of the display device, wherein the X-axis direction is the length direction of the display device, and the Z-axis direction is the thickness direction of the display device. A plurality of pressure sensing units 401 are provided on the side of the display panel 40 close to the polarizer 30, that is, on the upper surface of the display panel 40, to form a pressure sensing integration in the display panel 40. The pressure sensing unit 401 is, for example, a capacitive pressure sensor or a resistive pressure sensor. The plurality of pressure sensing units 401 are uniformly arranged in the display panel 40, for example, in an array arrangement. The side of the cover plate 10 close to the optical adhesive layer 20 is the lower surface (or bonding surface) of the cover plate 10. A plurality of patterned structures 101 protruding toward the polarizer 20 are provided on the lower surface of the cover plate 10, and the patterned structures 101 are arranged corresponding to the plurality of pressure sensing units 401. That is, the number and arrangement of the patterned structures 101 are the same as those of the pressure sensing units 401, so that each protrusion of the patterned structure 101 corresponds to a pressure sensing unit 401. When the optical adhesive layer 20 bonds the cover plate 10, the polarizer 30 and the display panel 40 together, a protrusion is covered on the top of each pressure-sensitive unit 401. The first portion 201 of the optical adhesive layer 20 is, for example, the optical adhesive layer portion located between the protrusion of the patterned structure 101 and the plurality of pressure-sensitive units 401; the second portion 202 of the optical adhesive layer 20 is, for example, the remaining optical adhesive layer portion after removing the first portion 201.

[0042] It is understandable that due to the protruding arrangement of the patterned structure 101 and the low modulus of the optical adhesive layer 20, when the cover plate 10, the polarizer 30 and the display panel 40 are bonded together, the thickness of the first part 201 will be reduced accordingly due to the patterned structure 101, thereby effectively improving the mechanical hysteresis and creep of the first part 201 when subjected to external force. When the user presses the cover plate 10 at the corresponding position of the first part 201, the force absorbed by the first part 201 is reduced, and its deformation remains basically the same during the process of force loading and unloading, so that the signal-to-noise ratio and stability of the signals obtained by the multiple pressure sensing units 401 are effectively improved.

[0043] In an optional embodiment, the orthographic projection of the patterned structure 101 on the display panel 40 covers the area of ​​the pressure sensing unit 401. That is, the projection area of ​​the patterned structure 101 on the display panel 40 is equal to the area of ​​the pressure sensing unit 401; or, the projection area of ​​the patterned structure 101 on the display panel 40 is larger than the area of ​​the pressure sensing unit 401. In this way, it can be ensured that the optical adhesive layer 20 at the corresponding area of ​​the pressure sensing unit 401 is thinned, thereby effectively improving the signal-to-noise ratio and stability of the signal obtained by the pressure sensing unit 401. Preferably, the projection area of ​​the patterned structure 101 on the display panel 40 can be slightly larger than the area of ​​the pressure sensing unit 401, that is, the patterned structure 101 can slightly exceed the periphery of the pressure sensing unit 401 while covering the pressure sensing unit 401. Such a setting can not only ensure the improvement effect on the signal, but also prevent the area of ​​the patterned structure 101 from being too large to affect the adhesion of the optical adhesive layer 20.

[0044] In an optional embodiment, if Figure 1 As shown, the patterned structure 101 includes a plurality of protrusions, and the orthographic projections of the plurality of protrusions on the display panel 40 respectively cover a plurality of pressure sensing units 401, and the shape of the protrusions is, for example, circular. Optionally, the shape of the protrusions may also be square, diamond or triangle.

[0045] Alternatively, if Figure 2 or Figure 3 As shown, the patterned structure 101 includes a plurality of protrusions arranged in a matrix. Figure 2 The middle protrusions are strip-shaped protrusions arranged parallel to the X-axis, and the orthographic projection of each protrusion on the display panel 40 covers a row of the plurality of pressure sensing units 401; Figure 3 The middle protrusions are strip-shaped protrusions arranged parallel to the Y axis, and the orthographic projection of each protrusion on the display panel 40 covers one column of the plurality of pressure sensing units 401 .

[0046] It is understandable that the area of ​​the orthographic projection of the patterned structure 101 on the display panel 40 can be appropriately adjusted according to the shape of the patterned structure 101 and the shape of the pressure sensing unit 401. For example, when the shapes of the patterned structure 101 and the pressure sensing unit 401 are the same, the area of ​​the orthographic projection of the patterned structure 101 on the display panel 40 can be equal to the area of ​​the pressure sensing unit 401; when the shapes of the patterned structure 101 and the pressure sensing unit 401 are different, such as when the patterned structure 101 is circular and the pressure sensing unit 401 is square, the area of ​​the orthographic projection of the patterned structure 101 on the display panel 40 needs to be larger than the area of ​​the pressure sensing unit 401. During use, it can be flexibly adjusted according to the situation, as long as the optical adhesive layer 20 in the area corresponding to the pressure sensing unit 401 can be thinned, and the present application does not specifically limit the shape of the protrusion in the patterned structure 101.

[0047] In an optional embodiment, the thickness of the first portion 201 is 12%-50% of the thickness of the second portion 202. The shape of the first portion 201 matches the shape of the protrusion in the patterned structure 101. For example, when the protrusion is circular, the shape of the first portion 201 is a corresponding circular depression; when the shape of the protrusion is square, the shape of the first portion 201 is a corresponding square depression; when the shape of the protrusion is a long strip, the shape of the first portion 201 is a corresponding long strip groove.

[0048] Optionally, the thickness of the first part 201 is 15%, 20%, 25%, 30%, 35%, 38%, 40%, 45% or 48% of the thickness of the second part 202. The first part 201 that meets the above range of thickness can ensure the signal-to-noise ratio and stability of the signal obtained by the pressure sensing unit 401. It is easy to understand that the thinner the thickness of the first part 201, the higher the signal-to-noise ratio of the signal obtained by the pressure sensing unit 401, and the better the stability. However, due to the limitations of the material properties such as the density or strength of the optical adhesive layer 20, the minimum thickness of the first part 201 is 12% of the thickness of the second part, that is, the thickness of the first part 201 is reduced by 88%. At the same time, in order to improve the signal obtained by the pressure sensing unit 401, the thickness of the first part 201 must be reduced by at least 50%, that is, the thickness of the first part 201 is half the thickness of the second part 202. In use, the thickness of the first part 201 can be determined according to limiting factors such as the material properties of the optical adhesive layer 20, and the thickness is not specifically limited in this application.

[0049] Preferably, the thickness of the first part is 10 μm-100 μm, and the thickness of the second part is 25 μm-200 μm; more preferably, the thickness of the first part is 10 μm-50 μm, and the thickness of the second part is 50 μm-150 μm.

[0050] For example, the thickness of the first part is 15μm, 18μm, 20μm, 22μm, 25μm, 30μm, 36μm, 40μm, 43μm or 45μm, etc. The thickness of the second part 202 is 30μm, 50μm, 80μm, 100μm, 150μm, 165μm or 180μm, etc. According to the modulus of the optical glue or liquid optical glue selected for the existing optical glue layer 20 after curing (such as less than 150kPa), when the thickness of the first part 201 meets the above range, its absorption of external force can be reduced, its mechanical hysteresis and creep properties can be improved, and the signal-to-noise ratio and stability of the signal obtained by the pressure sensing unit 401 can be improved. In use, the thickness of the first part 201 can be determined according to the thickness of the second part 202 to ensure that the first part 201 is thinned enough to play an improvement effect on the signal obtained by the pressure sensing unit 401.

[0051] In an optional embodiment, if Figure 4 As shown in the figure, the angle α between the peripheral side surface of the protrusion in the patterned structure 101 and the optical adhesive layer 20 is less than 10°. For example, α is 5°, 6°, 7° or 8°. The angle α that satisfies the above range makes the transition interface between the protrusion and the optical adhesive layer 20 relatively smooth, and on the basis of ensuring the signal-to-noise ratio and stability of the signal obtained by the pressure sensing unit 401, it does not affect the display effect of the display device.

[0052] Optionally, the processing technology of the patterned structure 101 is, for example, numerical control machining (CNC), plasma etching or laser ablation; or, a combination of the above processing methods can be selected according to the position of the patterned structure 101 on the cover plate 10. Preferably, the processing technology of the patterned structure 101 is numerical control machining, and a three-dimensional patterned structure 101 is machined on the lower surface of the cover plate 10 by numerical control cold carving. CNC machining can be applied to different models of panels 10, matching pressure sensing units 401 at different positions, and improving the feasibility of mass production of the display device.

[0053] In an optional embodiment, the patterned structure 101 is disposed in a non-display area of ​​the display device. It is understandable that when the arrangement of the patterned structure 101 makes the signal-to-noise ratio of the signal obtained by the pressure sensing unit 401 sufficiently high, the patterned structure 101 can be disposed only in the non-display area of ​​the display device, and on the basis of ensuring the signal-to-noise ratio of the signal obtained by the pressure sensing unit 401, the display device can also have a larger display area, thereby improving the display effect of the display device.

[0054] The following will use five sets of embodiments and two sets of comparative examples to illustrate the effect of the thickness of the first portion 201 on the signal-to-noise ratio of the signal obtained by the pressure sensing unit 401 .

[0055] Example 1

[0056] The thickness of the second portion 202 of the optical adhesive layer 20 is 200 μm, the thickness of the first portion 201 of the optical adhesive layer 20 is 100 μm, the angle α between the convex peripheral side surface of the patterned structure 101 and the optical adhesive layer 20 is 6°, and the pressure sensing unit 401 is a resistive pressure sensor.

[0057] The thickness of the protrusion in the patterned structure 101 and the inclination of the surrounding side surface are determined according to the thickness of the first part 201 and the angle α, and the corresponding patterned structure 101 is processed on the bonding surface of the cover plate 10 through a CNC cold engraving process. The cover plate 10, the polarizer 30 and the display panel 40 are bonded together through the optical adhesive layer 20 to obtain a display device.

[0058] Example 2

[0059] The difference from the embodiment 1 is that the thickness of the first portion 201 of the optical adhesive layer 20 is 80 μm, and the other conditions are the same.

[0060] Example 3

[0061] The difference from the embodiment 1 is that the thickness of the first portion 201 of the optical adhesive layer 20 is 60 μm, and the other conditions are the same.

[0062] Example 4

[0063] The difference from the embodiment 1 is that the thickness of the first portion 201 of the optical adhesive layer 20 is 40 μm, and the other conditions are the same.

[0064] Example 5

[0065] The difference from the embodiment 1 is that the thickness of the first portion 201 of the optical adhesive layer 20 is 30 μm, and the other conditions are the same.

[0066] Comparative Example 1

[0067] The difference from the embodiment 1 is that the thickness of the first portion 201 of the optical adhesive layer 20 is 110 μm, and the other conditions are the same.

[0068] Comparative Example 2

[0069] The difference from the embodiment 1 is that the thickness of the first portion 201 of the optical adhesive layer 20 is 120 μm, and the other conditions are the same.

[0070] The cover plate 10 of the display device corresponding to the embodiment 1-5 and the comparative example 1-2 is pressed with the same pressure, and the pressure signal is converted into a MIPI signal by the touch IC and uploaded to the processor for analysis and processing to obtain the corresponding strength of the pressure signal; under the same conditions, the pressure on the panel 10 is removed, and the signal strength obtained by the processor analysis corresponds to its noise level. Then, the signal-to-noise ratio of the signal obtained by each pressure sensing unit 401 is calculated, and the final result is shown in the following table:

[0071] Example Thickness of the first part (μm) The first part of the thinning ratio Signal to Noise Ratio (db) Example 1 100 50％ 2.5 Example 2 80 60％ 4.8 Example 3 60 70％ 6.5 Example 4 40 80％ 10 Example 5 30 85％ 15 Comparative Example 1 120 40％ 0.38 Comparative Example 2 110 45％ 0.5

[0072] By comparing the corresponding data of Examples 1-5 and Comparative Example 1-2, it can be seen that when the first portion 201 is thinned by more than 50%, the signal-to-noise ratio of the signal obtained by the pressure sensing unit 401 can be significantly improved. According to the corresponding data of Examples 1-5, it can be seen that the smaller the thickness of the first portion 201, the better the improvement effect on the signal-to-noise ratio of the signal obtained by the pressure sensing unit 401; and when the thickness of the first portion 201 is less than 50μm, the signal-to-noise ratio of the signal obtained by the pressure sensing unit 401 is significantly improved, and its signal-to-noise ratio can reach more than 10db.

[0073] The embodiment of the present application also provides an electronic device, which includes a display device, and the display device can be the display device in any of the above embodiments. It is understandable that the electronic device can be any electronic device with a display function, such as a mobile phone, a tablet computer, a laptop computer, a video player, a wearable device, etc.

[0074] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0075] Furthermore, persons of ordinary skill in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present invention and to form different embodiments.

[0076] It will be appreciated by those skilled in the art that, although the present invention has been described with reference to exemplary embodiments, various changes may be made and its elements may be replaced with equivalents without departing from the scope of the present invention. In addition, many modifications may be made to adapt specific situations or materials to the teachings of the present invention without departing from the essential scope of the present invention.

Claims

1. A display device, comprising a display panel, a polarizer, an optical adhesive layer and a cover plate stacked in sequence, characterized in that: A plurality of pressure sensing units are provided on a surface of the display panel close to the polarizer; A patterned structure protruding toward the optical adhesive layer is provided on a side of the cover plate close to the optical adhesive layer; The patterned structure is arranged corresponding to the plurality of pressure sensing units; The optical adhesive layer comprises a first part and a second part, the first part is a part corresponding to the patterned structure, and the rest is the second part; The thickness of the first portion is smaller than the thickness of the second portion.

2. The display device according to claim 1, wherein: The orthographic projection of the patterned structure on the display panel covers the plurality of pressure sensing units.

3. The display device according to claim 2, wherein: The patterned structure includes a plurality of protrusions, the orthographic projections of the plurality of protrusions on the display panel respectively cover the plurality of pressure sensing units, and the shape of the protrusions is circular.

4. The display device according to claim 2, wherein: The patterned structure includes a plurality of protrusions, the orthographic projection of each protrusion on the display panel covers a row or a column of pressure-sensitive units among the plurality of pressure-sensitive units, and the shape of the protrusion is a long strip.

5. The display device according to claim 1, wherein: The thickness of the first portion is 12%-50% of the thickness of the second portion.

6. The display device according to claim 1, wherein: The thickness of the first part is 10 μm-100 μm, and the thickness of the second part is 25 μm-200 μm. Preferably, the thickness of the first part is 10 μm-50 μm, and the thickness of the second part is 50 μm-150 μm.

7. The display device according to claim 3 or 4, characterized in that: An included angle α between the peripheral side surface of the protrusion and the optical adhesive layer is less than 10°. Preferably, the included angle α is less than 8°.

8. The display device according to claim 1, wherein: The processing technology of the patterned structure includes one or more of CNC processing, plasma etching and laser ablation.

9. The display device according to claim 1, wherein: The pressure sensing unit is a capacitive pressure sensor or a resistive pressure sensor.

10. The display device according to claim 1, wherein: The patterned structure is disposed in a non-display area of ​​the display device.

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