A display device and a manufacturing method thereof

Abstract

The present invention discloses a display device and a manufacturing method thereof. The display device includes: a display panel, a composite layer disposed on the backlight side of the display panel, and a fingerprint recognition module disposed on the side of the composite layer away from the display panel; wherein, the composite layer covers the display panel, and the composite layer at least includes: a buffer layer disposed on the backlight side of the display panel; the buffer layer includes a first region, the orthographic projection of the first region on the display panel covers the orthographic projection of the fingerprint recognition module on the display panel, and the buffer layer located in the first region is made of a first adhesive material having a high elastic modulus, and the elastic modulus of the first adhesive material is 6 mpa - 8 mpa. The solution disclosed by the present invention can improve the color difference problem of the display device and enhance the display effect.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technologies, and particularly to a display device and a manufacturing method thereof. Background Art

[0002] With the continuous development of display technologies, as a new technological breakthrough in touch display screens, in-screen fingerprint has gradually been applied to display screens. In-screen fingerprint means that a fingerprint sensor is integrated under the display screen, and the fingerprint sensor responds to a touch operation of a user on a preset position on the display screen to collect the user's fingerprint information. This fingerprint information can be used for fingerprint recognition in scenarios such as payment or unlocking.

[0003] In existing display screens with in-screen fingerprint function, the fingerprint sensor is usually disposed in a hollowed-out area. When the display screen is lit, due to the inconsistent reflectivity between the hollowed-out area and the non-hollowed-out area, an optical color difference will be formed, resulting in a visible shadow in the hollowed-out area and affecting the display effect. Summary of the Invention

[0004] The present invention provides a display device and a manufacturing method thereof, which can improve the color difference problem of the display device and enhance the display effect.

[0005] In a first aspect, embodiments of the present invention provide a display device, including:

[0006] A display panel, a composite layer disposed on the backlight side of the display panel, and a fingerprint recognition module disposed on the side of the composite layer away from the display panel; wherein,

[0007] The composite layer covers the display panel, and the composite layer at least includes: a buffer layer disposed on the backlight side of the display panel;

[0008] The buffer layer includes a first region, the orthographic projection of the first region on the display panel covers the orthographic projection of the fingerprint recognition module on the display panel, and the buffer layer in the first region is made of a first adhesive material with a high elastic modulus, and the elastic modulus of the first adhesive material is 6 mpa - 8 mpa.

[0009] For the above display device, optionally, the entire buffer layer is made of the first adhesive material.

[0010] For the above display device, optionally, the buffer layer further includes a second region, the orthographic projection of the second region on the display panel does not overlap with the orthographic projection of the first region on the display panel, the buffer layer in the second region is made of foam, and the color of the foam is the same as the color of the first adhesive material.

[0011] For the above display device, optionally, the shortest distance from the edge of the orthographic projection of the fingerprint recognition module on the display panel to the edge of the orthographic projection of the first region on the display panel is 1 mm - 2 mm.

[0012] The display device as described above, optionally, the first adhesive material includes a photo-curable adhesive material and / or a heat-curable adhesive material;

[0013] Preferably, the first adhesive material is at least one of an optically clear adhesive (OCA), an optically clear resin (OCR), and a pressure-sensitive adhesive (PSA).

[0014] The display device as described above, optionally, the composite layer and the fingerprint recognition module are bonded by a second adhesive material;

[0015] Preferably, the second adhesive material is at least one of OCA, OCR, and PSA.

[0016] The display device as described above, optionally, a sealing layer is provided at the edge of the joint between the fingerprint recognition module and the second adhesive material.

[0017] In a second aspect, an embodiment of the present invention further provides a method for manufacturing a display device, including:

[0018] Preparing a metal layer, a transition layer, and a buffer layer respectively to form a composite layer;

[0019] Bonding the composite layer to the backlight side of the display panel;

[0020] Providing a fingerprint recognition module on the side of the metal layer away from the display panel;

[0021] Wherein, the buffer layer includes a first region, the orthographic projection of the first region on the display panel covers the orthographic projection of the fingerprint recognition module on the display panel, and the buffer layer located in the first region is made of a first adhesive material having a high elastic modulus, and the elastic modulus of the first adhesive material is 6 mpa - 8 mpa.

[0022] In the method for manufacturing the display device as described above, optionally, the entire buffer layer is made of the first adhesive material.

[0023] In the method for manufacturing the display device as described above, optionally, the buffer layer further includes a second region, the orthographic projection of the second region on the display panel does not overlap with the orthographic projection of the first region on the display panel, and preparing the buffer layer includes:

[0024] Attaching a foam on the side of the transition layer away from the metal layer, and cutting and removing the foam corresponding to the size and position of the first region;

[0025] Filling the first adhesive material at the position where the foam is removed to form the buffer layer;

[0026] Wherein, the color of the foam is the same as the color of the first adhesive material.

[0027] The present invention provides a display device and a manufacturing method thereof. By redesigning the composite layer, the composite layer includes at least a buffer layer. The buffer layer includes a first region, and the orthographic projection of the first region on the display panel covers the orthographic projection of the fingerprint recognition module on the display panel. The buffer layer located in the first region is made of a first adhesive material with a high elastic modulus, and the elastic modulus of the first adhesive material is 6 mpa - 8 mpa, avoiding the influence of the transmission of ultrasonic signals caused by using traditional foam as the buffer layer material. At the same time, by making the composite layer completely cover the display panel, the color difference problem of the display device can be improved, and the display effect can be enhanced. Description of the Drawings

[0028] Figure 1 is a schematic cross-sectional structure diagram of an existing display device with an in-screen fingerprint function;

[0029] Figure 2 is a schematic top view structure diagram of a display device provided by an embodiment of the present invention;

[0030] Figure 3 is a schematic cross-sectional structure diagram of a display device provided by an embodiment of the present invention;

[0031] Figure 4 is a schematic cross-sectional structure diagram of another display device provided by an embodiment of the present invention;

[0032] Figure 5 is a schematic flowchart of a manufacturing method of a display device provided by an embodiment of the present invention;

[0033] Figure 6 is a schematic flowchart of a manufacturing method of a composite layer provided by an embodiment of the present invention;

[0034] Figure 7 is a schematic manufacturing diagram of a composite layer provided by an embodiment of the present invention;

[0035] Figure 8 is a schematic flowchart of another manufacturing method of a composite layer provided by an embodiment of the present invention;

[0036] Figure 9 is a schematic manufacturing diagram of another composite layer provided by an embodiment of the present invention. Detailed Embodiments

[0037] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, rather than all the structures.

[0038] Meanwhile, the descriptions of the accompanying drawings and embodiments are illustrative rather than restrictive. The same reference numerals throughout the specification denote the same elements. Additionally, for the sake of understanding and ease of description, the thicknesses of some layers, films, panels, regions, etc. may be exaggerated in the accompanying drawings. It can also be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, the element can be directly on the other element or an intermediate element may also be present. Additionally, "on" means positioning the element on or under another element, but essentially does not mean positioning on the upper side of another element according to the direction of gravity. For the sake of convenience of understanding, the elements in the accompanying drawings of the present invention are all drawn on the upper side of another element.

[0039] In addition, unless explicitly described to the contrary, the word "comprising" and variations such as "including" or "having" will be understood to imply the inclusion of the element but not the exclusion of any other elements.

[0040] It should also be noted that the "and / or" mentioned in the embodiments of the present invention refers to any and all combinations including one or more of the related listed items. In the embodiments of the present invention, various components are described using "first", "second", "third", etc., but these components should not be limited by these terms. These terms are only used to distinguish one component from another. And, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are also intended to include the plural forms.

[0041] When a certain embodiment can be implemented differently, the specific process sequence can be executed differently from the described sequence. For example, two consecutively described processes can be executed substantially at the same time or in the reverse order of the described sequence.

[0042] Currently, as a new technological breakthrough in touch display screens, in-screen fingerprint is gradually being applied to display screens. Figure 1 The cross-sectional structural schematic diagram of an existing display device with an in-screen fingerprint function is shown, as Figure 1As shown in the figure, the display device includes: a display panel 1, a foam 2, a substrate 3, a copper foil 4, a fingerprint recognition module 5, and an adhesive layer 6. Since there is air in the foam 2, the air will affect the transmission of ultrasonic signals. Therefore, the foam 2, the substrate 3, and the copper foil 4 are perforated to form a hollow area. The fingerprint recognition module 5 is disposed in the hollow area, and the fingerprint recognition module 5 is attached to the display panel 1 through the adhesive layer 6. The area of the hollow area is larger than the area of the upper surface of the fingerprint recognition module 5. Therefore, the remaining hollow area will form a white border around the fingerprint recognition module 5. When the display screen is lit, the reflectivities of the position of the fingerprint recognition module 5, the white border position, and the non-hollow area are inconsistent, resulting in an optical color difference, causing a visible shadow in the hollow area. Especially in a brighter environment, this defect is more obvious, affecting the display effect.

[0043] To solve the above problems, an embodiment of the present invention provides a display device and a manufacturing method thereof, which can improve the color difference problem of the display device and enhance the display effect. Next, the structure, manufacturing method, and technical effects of the display device will be described in detail.

[0044] In addition, in the following embodiments, the display device is exemplified as a rectangle and the fingerprint recognition area is exemplified as a circle. In actual applications, the display device can also be in regular or irregular shapes such as a circle, a polygon, etc., and the fingerprint recognition area can also be in regular or irregular shapes such as a rectangle, a water droplet shape, etc. The present invention does not make specific limitations thereto.

[0045] Figure 2 The following shows a top view structural schematic diagram of a display device provided by an embodiment of the present invention. As Figure 2 shown, the display device includes a display area AA and a non-display area NAA adjacent to the display area AA. In Figure 2 the non-display area NAA surrounds the display area AA. The display area AA is the area of the display device for displaying a picture; the non-display area NAA generally includes peripheral driving elements, peripheral traces, and a fan-out area. Optionally, in order to achieve a narrow border, if the display device is a flexible display device, the non-display area NAA may further include a bending area and a non-bending area. The bending area is located between the non-bending area and the display area AA, and the border area (located in the non-display area) of the display device can be folded back to the back of the display device.

[0046] The display device has an in-screen fingerprint function. Therefore, the display area AA includes a fingerprint recognition area 10 and a non-fingerprint recognition area 11; wherein, a fingerprint recognition module is disposed in the fingerprint recognition area 10, and the fingerprint recognition module includes at least one fingerprint recognition sensor, so that the display device can not only display a picture but also implement a fingerprint recognition function, which is beneficial to the display device to achieve a full-screen design and reduce the border.

[0047] In the first exemplary embodiment, Figure 3The cross-sectional structural schematic diagram of a display device provided by an embodiment of the present invention is shown. As Figure 3 shown, the display device includes: a display panel 100, a composite layer 200, and a fingerprint recognition module 300.

[0048] Specifically, the composite layer 200 includes: a buffer layer 201 disposed on the backlight side of the display panel 100; a transition layer 202 disposed on the side of the buffer layer 201 away from the display panel 100; and a metal layer 203 disposed on the side of the transition layer 202 away from the buffer layer 201. The fingerprint recognition module 300 is disposed on the side of the composite layer 200 away from the display panel 100.

[0049] Referring Figure 3 it can be seen that the composite layer 200 completely covers the display panel 100. The buffer layer 201 includes a first region 2011 and a second region 2012. The orthographic projection of the first region 2011 on the display panel 100 covers the orthographic projection of the fingerprint recognition module 300 on the display panel 100. The orthographic projection of the second region 2012 on the display panel 100 does not overlap with the orthographic projection of the first region 2011 on the display panel 100, that is, the second region 2012 is the region of the buffer layer 201 other than the first region 2011. The buffer layer 201 located in the first region 2011 is made of a first adhesive material having a high elastic modulus. Since the buffer layer 201 located in the first region 2011 is made of a first adhesive material having a high elastic modulus, traditional foam is no longer used as the material of the buffer layer 201, avoiding the influence of the buffer layer 201 on the transmission of ultrasonic signals; at the same time, the composite layer 200 completely covers the display panel 100, which can improve the color difference problem of the display device and enhance the display effect.

[0050] In one embodiment, the elastic modulus of the first adhesive material is 6 mpa - 8 mpa. The first adhesive material having a high elastic modulus can play a buffering role and protect the display device from damage.

[0051] The first adhesive material includes but is not limited to photocurable adhesive materials and / or thermocurable adhesive materials; optionally, the first adhesive material is at least one of an Optically Clear Adhesive (OCA), an Optically Clear Resin (OCR), and a Pressure Sensitive Adhesive (PSA).

[0052] In one embodiment, the orthographic projection of the first region 2011 on the display panel 100 covering the orthographic projection of the fingerprint recognition module 300 on the display panel 100 means that the orthographic projection of the first region 2011 on the display panel 100 at least coincides with the orthographic projection of the fingerprint recognition module 300 on the display panel 100. When the orthographic projection of the first region 2011 on the display panel 100 coincides with the orthographic projection of the fingerprint recognition module 300 on the display panel 100, the width of the first region 2011 is equal to the width of the fingerprint recognition module 300. In this way, the influence of the buffer layer 201 located in the first region 2011 on the transmission of ultrasonic signals is avoided, and the performance of the fingerprint recognition module 300 is ensured.

[0053] Alternatively, in order to reduce the manufacturing difficulty, as Figure 3 shown, the orthographic projection of the fingerprint recognition module 300 on the display panel 100 is within the orthographic projection of the first region 2011 on the display panel 100. That is, the width of the first region 2011 is slightly larger than the width of the fingerprint recognition module 300. Optionally, referring to Figure 3 , the shortest distance L from the edge of the orthographic projection of the fingerprint recognition module 300 on the display panel 100 to the edge of the orthographic projection of the first region 2011 on the display panel 100 is 1 mm - 2 mm.

[0054] Continuing to refer to Figure 3 , the buffer layer 201 located in the second region 2012 is made of foam, and the color of the foam is the same as the color of the first adhesive material. Generally, the colors of the foam and the first adhesive material are both black. Since there is no fingerprint recognition module 300 provided below the buffer layer 201 located in the second region 2012, the use of foam for the buffer layer 201 in this region does not affect the transmission of ultrasonic signals. At the same time, the use of foam for the buffer layer 201 in this region can control the production cost of the display device; at the same time, the color of the foam is the same as the color of the first adhesive material, which can ensure the consistency of the reflectivity of the display device, thereby further improving the color difference problem of the display device and enhancing the display effect.

[0055] In the second exemplary embodiment, Figure 4 shows a schematic cross-sectional structure diagram of another display device provided by an embodiment of the present invention. Different from the Figure 3 display device shown, Figure 4 the buffer layer 201 of the display device shown is entirely made of the first adhesive material, that is, the entire buffer layer 201 is made of the first adhesive material with an elastic modulus of 6 mpa - 8 mpa, and the buffer layer 201 is an integrally formed structure. In this way, one die-cutting process can be reduced, and the manufacturing difficulty of the buffer layer 201 can be reduced.

[0056] In one embodiment, the transition layer 202 is typically made of a flexible substrate material, polyimide (PI). PI is one of the materials with the best heat resistance among existing polymer materials and has excellent chemical stability and mechanical properties. The metal layer 203 is typically a copper foil.

[0057] The metal layer 203 in the composite layer 200 and the fingerprint recognition module 300 are adhered by a second adhesive material 301; the second adhesive material 301 has good adhesion to ensure the adhesion effect between the metal layer 203 and the fingerprint recognition module 300.

[0058] Optionally, the second adhesive material is at least one of OCA, OCR, and PSA.

[0059] It can be understood that when both the first adhesive material and the second adhesive material are OCR, the OCR of the first adhesive material and the OCR of the second adhesive material can be different. This is because the main function of the first adhesive material is to act as a buffer to protect the display device from damage; while the main function of the second adhesive material is to bond the metal layer 203 and the fingerprint recognition module 300 together. That is, the first adhesive material focuses on selecting materials with a high elastic modulus, and the second adhesive material focuses on selecting materials with high adhesion.

[0060] Furthermore, as Figure 3 and Figure 4 shown, a sealant layer 302 is provided at the edge of the fingerprint recognition module 300. The sealant layer 302 is adhered to the edge of the joint between the second adhesive material 301 and the fingerprint recognition module 300 to prevent moisture from entering the fingerprint recognition module 300. In addition, the sealant layer 302 usually selects a black glue that can be naturally cured at room temperature. Since the glue can be cured at room temperature, it will not affect other components due to the stress during the curing process of the glue. The black sealant layer 302 can also absorb the overflowing light.

[0061] In one embodiment, the display device may further include: a polarizer disposed on the side of the display panel 100 away from the composite layer 200; an adhesive layer disposed on the side of the polarizer away from the display panel 100; and a cover plate disposed on the side of the adhesive layer away from the polarizer.

[0062] The display panel 100 includes a driving circuit layer (including thin film transistors), a light-emitting element disposed on the driving circuit layer, and a packaging layer disposed on the light-emitting element.

[0063] Taking a thin-film transistor with a top-gate structure as an example, specifically, the thin-film transistor includes: a buffer film layer located on a substrate, an active layer located on the buffer film layer, a gate insulating layer located on the active layer, a gate located on the gate insulating layer, an interlayer insulating layer located on the gate, a source electrode and a drain electrode located on the interlayer insulating layer; a passivation layer located on the source electrode and the drain electrode; wherein, the source electrode and the drain electrode can be located on the same layer and are obtained through a single patterning process, therefore, the source electrode and the drain electrode can also be referred to as a source-drain metal layer.

[0064] When the light-emitting element is an organic light-emitting diode, in the direction away from the substrate, the light-emitting element sequentially includes an anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode. The anode of the light-emitting element is electrically connected to the drain electrode of the thin-film transistor. Specifically, the anode is electrically connected to the drain electrode through a via hole penetrating the passivation layer.

[0065] The encapsulation layer can include at least one inorganic encapsulation layer and at least one organic encapsulation layer, wherein the inorganic encapsulation layer and the organic encapsulation layer are alternately stacked.

[0066] The display device can further include a front camera and sensors. The front camera and sensors are correspondingly disposed below the display area of the display panel 100. Optionally, in addition to the front camera and sensors, other devices such as a gyroscope or a receiver can also be disposed below the display area.

[0067] Among them, the display panel 100 can be any one of an organic light-emitting diode (OLED) display panel, an in-plane switching (IPS) display panel, a twisted nematic (TN) display panel, a vertical alignment (VA) display panel, an electronic paper, a QLED (quantum dot light emitting diodes) display panel, or a micro LED (micro light-emitting diode, μLED) display panel, etc., and the present invention does not specifically limit this. The light-emitting mode of the display panel 100 can be top emission, bottom emission, or double-sided emission.

[0068] The display device provided by the embodiments of the present invention can be applied in smart wearable devices (such as smart bracelets and smart watches), and can also be applied in devices such as smart phones, tablet computers, and monitors.

[0069] An embodiment of the present invention provides a display device, including: a display panel, a composite layer disposed on the backlight side of the display panel, and a fingerprint recognition module disposed on the side of the composite layer away from the display panel; wherein, the composite layer covers the display panel, and the composite layer at least includes: a buffer layer disposed on the backlight side of the display panel; the buffer layer includes a first region, a positive projection of the first region on the display panel covers a positive projection of the fingerprint recognition module on the display panel, and the buffer layer in the first region is made of a first adhesive material with a high elastic modulus, and the elastic modulus of the first adhesive material is 6 mpa - 8 mpa. By redesigning the composite layer, the composite layer at least includes a buffer layer, wherein the buffer layer includes a first region, a positive projection of the first region on the display panel covers a positive projection of the fingerprint recognition module on the display panel, and the buffer layer in the first region is made of a first adhesive material with a high elastic modulus, and the elastic modulus of the first adhesive material is 6 mpa - 8 mpa, avoiding the influence of the transmission of ultrasonic signals caused by using traditional foam as the buffer layer material; at the same time, making the composite layer completely cover the display panel can improve the color difference problem of the display device and enhance the display effect.

[0070] Figure 5 The flowchart of a manufacturing method of a display device provided by an embodiment of the present invention is shown, and this manufacturing method is used to manufacture Figure 3 or Figure 4 the display device shown, as Figure 5 shown, the manufacturing method of the display device may include steps S101 - S103.

[0071] S101. Prepare a metal layer, a transition layer and a buffer layer respectively to form a composite layer.

[0072] Wherein, the buffer layer includes a first region, a positive projection of the first region on the display panel covers a positive projection of the fingerprint recognition module on the display panel, and the buffer layer in the first region is made of a first adhesive material with a high elastic modulus, and the elastic modulus of the first adhesive material is 6 mpa - 8 mpa.

[0073] In a possible implementation manner, specifically, Figure 6 The flowchart of a manufacturing method of a composite layer provided by an embodiment of the present invention is shown, Figure 7 The manufacturing schematic diagram of a composite layer provided by an embodiment of the present invention is shown. As Figure 6 shown, the method for forming the composite layer may specifically include S101a - S101c:

[0074] S101a. Prepare a metal layer and a transition layer respectively, and bond the metal layer and the transition layer together.

[0075] As Figure 7As shown, the metal layer 203 is usually a copper foil. The transition layer 202 is usually made of PI, which is one of the existing polymer materials with the best heat resistance performance and has excellent chemical stability and mechanical properties.

[0076] S101b. Attach a foam on the side of the transition layer away from the metal layer, and cut and remove the foam corresponding to the size and position of the first region.

[0077] As Figure 7 shown, after the foam is cut, only the foam located in the second region 2012 remains. Since the fingerprint recognition module will not be provided below the second region 2012, using traditional foam materials will not affect the performance of the fingerprint recognition module.

[0078] S101c. Fill the position where the foam is removed with a first adhesive material to form a buffer layer.

[0079] The first adhesive material is located in the first region 2011, and the orthographic projection of the first region 2011 on the display panel 100 covers the orthographic projection of the fingerprint recognition module on the display panel 100. Since the buffer layer 201 located in the first region 2011 is made of a first adhesive material with a high elastic modulus and traditional foam is no longer used as the material of the buffer layer 201, the influence of the buffer layer 201 on the transmission of ultrasonic signals is avoided.

[0080] In another possible implementation manner, specifically, Figure 8 shows a schematic flowchart of another method for manufacturing a composite layer provided by an embodiment of the present invention, Figure 9 shows another schematic diagram for manufacturing a composite layer provided by an embodiment of the present invention. As Figure 8 shown, the method for forming the composite layer may specifically include S101y and S101z:

[0081] S101y. Prepare the metal layer, the transition layer, and the buffer layer respectively.

[0082] As Figure 9 shown, the metal layer 203 is usually a copper foil. The transition layer 202 is usually made of PI, which is one of the existing polymer materials with the best heat resistance performance and has excellent chemical stability and mechanical properties.

[0083] The buffer layer 201 is all made of a first adhesive material with a high elastic modulus, and the buffer layer 201 is an integrally formed structure. In this way, one die-cutting process can be reduced, and the manufacturing difficulty of the buffer layer 201 can be reduced.

[0084] S101z. Bond the metal layer, the transition layer, and the buffer layer together to form a composite layer.

[0085] S102. Bond the composite layer to the backlight side of the display panel.

[0086] After forming the composite layer through the above two possible implementation manners, attach the composite layer to the backlight side of the display panel so that the composite layer covers the display panel.

[0087] S103. Set a fingerprint recognition module on the side of the metal layer away from the display panel.

[0088] Bond the fingerprint recognition module to the metal layer through a second adhesive material on the side of the metal layer away from the display panel. Optionally, a sealant layer may also be provided at the edge of the joint between the fingerprint recognition module and the second adhesive material to prevent moisture from entering the fingerprint recognition module.

[0089] The sealant layer generally selects a glue that is black and can cure naturally at room temperature. Since the glue can cure at room temperature, it will not affect other components due to the stress during the curing process of the glue. The black sealant layer can also absorb the overflowing light.

[0090] An embodiment of the present invention provides a manufacturing method of a display device, including: respectively preparing a metal layer, a transition layer and a buffer layer to form a composite layer; attaching the composite layer to the backlight side of the display panel; setting a fingerprint recognition module on the side of the metal layer away from the display panel; wherein, the buffer layer includes a first region, the orthographic projection of the first region on the display panel covers the orthographic projection of the fingerprint recognition module on the display panel, and the buffer layer located in the first region is made of a first adhesive material with a high elastic modulus, and the elastic modulus of the first adhesive material is 6 mpa - 8 mpa. By redesigning the composite layer, the composite layer at least includes a buffer layer, wherein the buffer layer includes a first region, the orthographic projection of the first region on the display panel covers the orthographic projection of the fingerprint recognition module on the display panel, and the buffer layer located in the first region is made of a first adhesive material with a high elastic modulus, and the elastic modulus of the first adhesive material is 6 mpa - 8 mpa, avoiding the influence on the transmission of ultrasonic signals caused by using traditional foam as the buffer layer material; at the same time, making the composite layer completely cover the display panel can improve the color difference problem of the display device and enhance the display effect.

[0091] Note that the above is only a preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it may also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display device, characterized in that, Including: A display panel, a composite layer disposed on the backlight side of the display panel, and a fingerprint recognition module disposed on the side of the composite layer away from the display panel; wherein, The composite layer covers the display panel, and the composite layer at least includes: a buffer layer disposed on the backlight side of the display panel; The buffer layer includes a first region, a positive projection of the first region on the display panel covers a positive projection of the fingerprint recognition module on the display panel, and the buffer layer located in the first region is made of a first adhesive material having a high elastic modulus, and the elastic modulus of the first adhesive material is 6 mpa - 8 mpa; The buffer layer further includes a second region, a positive projection of the second region on the display panel does not overlap with a positive projection of the first region on the display panel, the buffer layer located in the second region is made of foam, and the color of the foam is the same as the color of the first adhesive material.

2. The display device according to claim 1, wherein The shortest distance from the edge of the positive projection of the fingerprint recognition module on the display panel to the edge of the positive projection of the first region on the display panel is 1 mm - 2 mm.

3. The display device according to any one of claims 1-2, characterized in that, The first adhesive material includes a photo-curable adhesive material and / or a thermo-curable adhesive material.

4. The display device according to claim 3, wherein The first adhesive material is at least one of an optically clear adhesive (OCA), an optically clear resin (OCR), and a pressure-sensitive adhesive (PSA).

5. The display device according to claim 1, wherein The composite layer and the fingerprint recognition module are bonded by a second adhesive material.

6. The display device according to claim 5, wherein The second adhesive material is at least one of OCA, OCR, and PSA.

7. The display device according to claim 5, characterized in that, A sealing layer is provided at the edge of the joint between the fingerprint recognition module and the second adhesive material.

8. A manufacturing method of a display device, characterized in that, Including: Preparing a metal layer, a transition layer, and a buffer layer respectively to form a composite layer; Bonding the composite layer to the backlight side of the display panel; Providing a fingerprint recognition module on the side of the metal layer away from the display panel; Wherein, the buffer layer includes a first region, a positive projection of the first region on the display panel covers a positive projection of the fingerprint recognition module on the display panel, and the buffer layer located in the first region is made of a first adhesive material having a high elastic modulus, and the elastic modulus of the first adhesive material is 6 mpa - 8 mpa; The buffer layer further includes a second region, a positive projection of the second region on the display panel does not overlap with a positive projection of the first region on the display panel, and preparing the buffer layer includes: Attaching foam to the side of the transition layer away from the metal layer, and cutting and removing the foam corresponding to the size and position of the first region; Filling the first adhesive material at the position where the foam is removed to form the buffer layer; Wherein, the color of the foam is the same as the color of the first adhesive material.

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