Display device and intelligent terminal

Abstract

The application relates to a display device and a smart terminal, comprising an ultrasonic fingerprint identification module and an OLED display module, further comprising a laminated structure, the laminated structure comprising a copper foil and adhesive layers arranged on two opposite surfaces of the copper foil, the laminated structure being arranged between the ultrasonic fingerprint identification module and the OLED display module and adhering the ultrasonic fingerprint identification module and the OLED display module through the adhesive layers, the adhesive layer between the copper foil and the ultrasonic fingerprint identification module fixing the ultrasonic fingerprint identification module on the copper foil, the adhesive layer between the copper foil and the OLED display module fixing the copper foil on the OLED display module, the Young's modulus of the copper foil being relatively high, the ultrasonic wave being more easily penetrated, the ultrasonic wave emitted by the ultrasonic fingerprint identification module being more easily penetrated through the laminated structure, and more ultrasonic waves entering the fingerprint sensing area, the reflected ultrasonic wave being more easily penetrated through the laminated structure into the ultrasonic fingerprint identification module, more fingerprint scanning information being obtained, and the fingerprint identification effect being better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display device and a smart terminal. BACKGROUND

[0002] With the improvement of people's awareness of information security protection, more and more display devices use fingerprint identification technology, and in order to pursue better visual effects, the screen ratio of mobile phones is getting larger and larger, and the full screen with under-screen fingerprint identification emerges as the times require.

[0003] The under-screen fingerprint identification of the existing full screen mainly adopts optical fingerprint identification, sets the optical fingerprint identification module under the OLED (organic light emitting diode) screen and connects them together to form a display device, and the user can directly operate on the OLED screen to realize fingerprint identification. However, this optical fingerprint identification method needs to use the OLED screen to emit light or set an infrared light source, which increases power consumption and has a relatively complex structure, and the identification speed and accuracy are relatively low. At present, ultrasonic fingerprint identification has become another development direction of full-screen under-screen fingerprint identification due to its strong penetration and good identification effect. The existing ultrasonic fingerprint identification mainly uses adhesive to adhere the ultrasonic fingerprint identification module under the OLED screen, but the existence of the adhesive will affect the penetration effect of the ultrasonic wave, resulting in poor fingerprint identification effect, so the adhesion method of the ultrasonic fingerprint identification module has become an important factor restricting the development of ultrasonic fingerprint identification technology, and is a technical problem to be solved at present. SUMMARY

[0004] Therefore, it is necessary to provide a display device and a smart terminal to solve the problem that the existence of the adhesive affects the penetration effect of the ultrasonic wave when the ultrasonic fingerprint identification module is adhered, and to improve the penetration effect of the ultrasonic wave and the fingerprint identification effect.

[0005] The present application provides a display device, comprising an ultrasonic fingerprint identification module and an OLED display module, further comprising a laminated structure, the laminated structure comprising a copper foil and a glue layer arranged on two opposite surfaces of the copper foil, the laminated structure being arranged between the ultrasonic fingerprint identification module and the OLED display module and adhering the ultrasonic fingerprint identification module and the OLED display module through the glue layer.

[0006] The glue layer between the copper foil and the ultrasonic fingerprint identification module fixes the ultrasonic fingerprint identification module to the copper foil, and the glue layer between the copper foil and the OLED display module fixes the copper foil to the OLED display module, so that the ultrasonic fingerprint identification module and the OLED display module are fixed as a whole through the above-mentioned laminated structure. Since the Young's modulus of the copper foil is high, up to 110 GPa-128 GPa, it is easier for the ultrasonic wave to penetrate, and the ultrasonic wave emitted by the ultrasonic fingerprint identification module can penetrate the laminated structure more, so that more ultrasonic waves enter the fingerprint sensing area of the OLED display module, and the ultrasonic waves reflected from the user's finger can penetrate the laminated structure more to enter the ultrasonic fingerprint identification module, thereby obtaining more fingerprint scanning information, and the fingerprint recognition effect is better.

[0007] In one of the embodiments, the thickness of the copper foil is 6-12 μm, but is not limited thereto. By controlling the thickness of the copper foil, it can be ensured that the ultrasonic wave is more easily penetrated, and at the same time, the introduction of the laminated structure can avoid affecting the thickness of the display device.

[0008] In one of the embodiments, the thickness of the glue layer is 3-10 μm, but is not limited thereto. By controlling the thickness of the glue layer, the introduction of the laminated structure can avoid affecting the thickness of the display device.

[0009] In one of the embodiments, the thickness of the glue layer on the two surfaces of the copper foil is the same, so that the laminated structure has no difference between the front and back, so as to facilitate the laminated structure to fixedly connect the ultrasonic fingerprint identification module and the OLED display module.

[0010] In one of the embodiments, the thickness of the copper foil is 7 μm, and the thickness of the glue layer is 6 μm, but is not limited thereto. On the basis of ensuring the thinness of the display device, a better ultrasonic wave penetration effect can be obtained, and the fingerprint recognition effect is improved.

[0011] In one of the embodiments, the thickness of the glue layer on the two sides of the copper foil is different, so as to meet the different bonding requirements between the copper foil and the OLED display module and between the copper foil and the ultrasonic fingerprint identification module.

[0012] In one of the embodiments, the thickness of the copper foil is 6 μm, the thickness of the glue layer between the copper foil and the ultrasonic fingerprint identification module is 9 μm, and the thickness of the glue layer between the copper foil and the OLED display module is 3 μm, but is not limited thereto. On the basis of ensuring the stability of the structure of the display device, a better ultrasonic wave penetration effect can be obtained, and the fingerprint recognition effect is improved.

[0013] In one of the embodiments, the glue layer is a pressure-sensitive adhesive, but is not limited thereto.

[0014] In one embodiment, an OLED display module includes an OLED display panel and a cover glass. The laminated structure is disposed on a side of the OLED display panel facing away from the cover glass. The thickness of the OLED display panel is 300 μm to 600 μm, and the thickness of the cover glass is 0.4 mm to 0.8 mm. By controlling the thickness of the laminated structure, OLED display panel, and cover glass, a thinner and lighter display device can be achieved.

[0015] In addition, the present invention also provides an intelligent terminal, including the display device in the above embodiments, and the display device is arranged in the shell. Since the display device can make ultrasonic waves more easily penetrate, the ultrasonic wave penetration effect is improved, and the fingerprint recognition effect is better, therefore, the fingerprint recognition effect of the intelligent terminal with the display device is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a display device provided by the present invention;

[0017] Figure 2 This is another structural schematic diagram of a display device provided by the present invention. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0019] The technical solutions provided by the embodiments of the present invention are described below with reference to the accompanying drawings.

[0020] like Figure 1 as well as Figure 2 As shown, the present invention provides a display device, which includes three parts: an ultrasonic fingerprint recognition module 100, an OLED display module 200, and a stacked structure 300. The stacked structure 300 is arranged between the ultrasonic fingerprint recognition module 100 and the OLED display module 200. In a specific arrangement, the stacked structure 300 includes a copper foil 310 and adhesive layers (320 and 330) arranged on two opposite surfaces of the copper foil 310. The adhesive layer between the copper foil 310 and the OLED display module 200 is a first adhesive layer 320, and the adhesive layer between the copper foil 310 and the ultrasonic fingerprint recognition module 100 is a second adhesive layer 330. The first adhesive layer 320 and the second adhesive layer 330 are bonded to the ultrasonic fingerprint recognition module 100 and the OLED display module 200.

[0021] The second adhesive layer 330 between the copper foil 310 and the ultrasonic fingerprint identification module 100 fixes the ultrasonic fingerprint identification module 100 to the copper foil 310, and the first adhesive layer 320 between the copper foil 310 and the OLED display module 200 fixes the copper foil 310 to the OLED display module 200, so that the ultrasonic fingerprint identification module 100 and the OLED display module 200 can be fixed as a whole through the above-mentioned laminated structure 300. Since the Young's modulus of the copper foil 310 is high, up to 110 GPa-128 GPa, it is easier for the ultrasonic wave to penetrate, and the ultrasonic wave emitted by the ultrasonic fingerprint identification module 100 can penetrate the laminated structure 300 more, so that more ultrasonic waves enter the fingerprint sensing area of the OLED display module 200, and the ultrasonic waves reflected from the user's finger can penetrate the laminated structure 300 more to enter the ultrasonic fingerprint identification module 100, thereby obtaining more fingerprint scanning information, and the fingerprint recognition effect is better.

[0022] In addition, the display device formed by fixing and connecting the ultrasonic fingerprint identification module 100 and the OLED display module 200 through the laminated structure 300 can be reworked, and can be disassembled and reattached when the attachment is poor, and can be replaced when one of the components fails, avoiding the situation that the display device is scrapped due to the failure of one component, improving the product yield and reducing the manufacturing cost loss.

[0023] In order to ensure the penetration effect of the ultrasonic wave, in a preferred embodiment, the thickness of the copper foil 310 can be 6-12 microns, but it is not limited thereto.

[0024] The thickness of the copper foil 310 is controlled within the range of 6-12 microns, the ultrasonic wave penetrates more easily, the under-screen fingerprint recognition signal strength is greater, and the fingerprint recognition effect is better. At the same time, controlling the thickness of the copper foil 310 within the range of 6-12 microns can also ensure that the overall thickness of the display device is small, avoiding the influence of the introduction of the laminated structure 300 on the thickness of the display device. The thickness of the copper foil 310 can be 6 microns, 7 microns, 8 microns, 9 microns, 10 microns, 11 microns, or 12 microns. The specific thickness of the copper foil 310 can be selected according to the actual situation of the display device. In the specific setting, the thickness of the laminated structure 300 can be determined according to the size of the ultrasonic fingerprint identification module 100 and the OLED display module 200, and the thickness of the copper foil 310 can be determined according to the required under-screen fingerprint recognition signal strength.

[0025] In order to avoid the influence of the introduction of the laminated structure 300 on the thickness of the display device, in a preferred embodiment, the thickness of the adhesive layer can be 3-10 microns, but it is not limited thereto.

[0026] The first adhesive layer 320 can have a thickness of 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm, and the second adhesive layer 330 can also have a thickness of 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm. The specific thickness of the first adhesive layer 320 and the second adhesive layer 330 can be selected according to the actual situation of the display device. When the first adhesive layer 320 and the second adhesive layer 330 are arranged, the thickness of the laminated structure 300 can be determined according to the size of the ultrasonic fingerprint identification module 100 and the OLED display module 200, and the thickness of the first adhesive layer 320 and the second adhesive layer 330 can be determined according to the required under-screen fingerprint identification signal strength and the thickness of the copper foil 310.

[0027] In order to facilitate the fixation of the laminated structure 300 to the ultrasonic fingerprint identification module 100 and the OLED display module 200, as shown in Figure 1 and Figure 2 In a preferred embodiment, the thickness of the first adhesive layer 320 and the second adhesive layer 330 on the opposite surfaces of the copper foil 310 is the same.

[0028] In the above display device, during assembly, the laminated structure 300 is first fixed to the OLED display module 200. At this time, the copper foil 310 is fixed to the OLED display module 200 through the first adhesive layer 320. Then, the ultrasonic fingerprint identification module 100 is fixed to the laminated structure 300. At this time, the ultrasonic fingerprint identification module 100 is fixed to the copper foil 310 through the second adhesive layer 330, thereby ensuring that the ultrasonic fingerprint identification module 100 and the OLED display module 200 are fixed as a whole. By limiting the thickness of the first adhesive layer 320 and the second adhesive layer 330 to be the same, the structure of the laminated structure 300 has no difference between the front and back surfaces, and during assembly, it is not necessary to consider which surface is attached to the OLED display module 200. The laminated structure 300 can be directly attached, and the entire process is convenient and efficient, thereby improving the production efficiency.

[0029] In order to obtain better ultrasonic penetration effect while ensuring the thinness of the display device, the specific size of the laminated structure 300 can have various design methods. Specifically, the thickness of the copper foil 310 can be 7 μm, and the thickness of the adhesive layer can be 6 μm, but it is not limited thereto.

[0030] In the above display device, the specific size of the laminated structure 300 can have the following design methods:

[0031] In the first method, the thickness of the copper foil 310 is 6 μm, the thickness of the first adhesive layer 320 is 3 μm, and the thickness of the second adhesive layer 330 is also 3 μm. In this case, the under-screen fingerprint identification signal strength of the display device is 4.5-6.5.

[0032] In the second mode, the thickness of the copper foil 310 is 7 μm, the thickness of the first adhesive layer 320 is 6 μm, and the thickness of the second adhesive layer 330 is also 6 μm. In this case, the under-screen fingerprint recognition signal strength of the display device is 4.5-6.5.

[0033] In the third mode, the thickness of the copper foil 310 is 12 μm, the thickness of the first adhesive layer 320 is 10 μm, and the thickness of the second adhesive layer 330 is also 10 μm. In this case, the under-screen fingerprint recognition signal strength of the display device is 4.5-6.5.

[0034] The under-screen fingerprint recognition signal strength of the display device formed by bonding the ultrasonic fingerprint recognition module 100 and the OLED display module 200 using the adhesive is 4, while the under-screen fingerprint recognition signal strength of the display device in the above three modes is 4.5-6.5. Therefore, the display device is more easily penetrated by ultrasonic waves, and the fingerprint recognition effect is better.

[0035] In the specific arrangement, the thickness of the laminated structure 300 can be determined according to the size of the display device, the size of the ultrasonic fingerprint recognition module 100 and the OLED display module 200, and the thickness of the copper foil 310 and the adhesive layer can be selected according to the required under-screen fingerprint recognition signal strength. By controlling the thickness of the copper foil 310 and the adhesive layer, the thickness of the laminated structure 300 is reduced, and the display device is thinned.

[0036] In a preferred embodiment, the thickness of the first adhesive layer 320 and the second adhesive layer 330 on the two sides of the copper foil 310 is different.

[0037] The display device described above has different thicknesses and area sizes of the OLED display module 200 and the ultrasonic fingerprint recognition module 100. The size of the force required to fix the laminated structure 300 to the OLED display module 200 is different from the size of the force required to fix the ultrasonic fingerprint recognition module 100 to the laminated structure 300. Therefore, the thickness of the first adhesive layer 320 and the thickness of the second adhesive layer 330 are also different. By controlling the different thicknesses of the first adhesive layer 320 and the second adhesive layer 330 on the opposite surfaces of the copper foil 310, the different bonding requirements of the copper foil 310 and the OLED display module 200, and the copper foil 310 and the ultrasonic fingerprint recognition module 100 are met. On the basis of saving preparation materials and costs, the stability of the bonding is ensured, and the reliability of the structure of the display device is ensured.

[0038] In order to obtain better ultrasonic wave penetration effect on the basis of ensuring the thinness of the display device, specifically, the thickness of the copper foil 310 is 6 μm, the thickness of the second adhesive layer 330 between the copper foil 310 and the ultrasonic fingerprint identification module 100 is 9 μm, and the thickness of the first adhesive layer 320 between the copper foil 310 and the OLED display module 200 is 3 μm, but not limited thereto.

[0039] In the display device, the thickness of the copper foil 310 is 6 μm, the thickness of the first adhesive layer 320 is 3 μm, and the thickness of the second adhesive layer 330 is 9 μm, and at this time, the under-screen fingerprint identification signal strength of the display device is 4.5-6.5. The under-screen fingerprint identification signal strength of the display device formed by using the adhesive to bond the ultrasonic fingerprint identification module 100 and the OLED display module 200 is 4, and the under-screen fingerprint identification signal strength of the display device is 4.5-6.5. Therefore, the display device is more easily penetrated by ultrasonic waves, and the fingerprint identification effect is better.

[0040] In the specific setting, the thickness of the laminated structure 300 can be determined according to the size of the display device, the size of the ultrasonic fingerprint identification module 100 and the OLED display module 200, and the thickness of the copper foil 310 and the thickness of the first adhesive layer 320 and the second adhesive layer 330 can be selected according to the size relationship between the ultrasonic fingerprint identification module 100 and the OLED display module 200. And by controlling the thickness of the copper foil 310 and the first adhesive layer 320 and the second adhesive layer 330 to reduce the thickness of the laminated structure 300, the thinness of the display device is realized.

[0041] The material of the adhesive layer has many kinds, and in one preferred embodiment, the adhesive layer can be a pressure-sensitive adhesive, but not limited thereto, and can also be other adhesive materials that can meet the bonding needs.

[0042] In the display device, the adhesive layer can be a pressure-sensitive adhesive, which is a kind of adhesive that is sensitive to pressure, and has a large peel force. In the use process, it is not easy to have phenomena such as delamination, and can better realize the bonding and fixation between the laminated structure 300 and the OLED display module 200, and between the ultrasonic fingerprint identification module 100 and the laminated structure 300, and ensure the stability of the structure of the display device.

[0043] Specifically, the pressure-sensitive adhesive is an acrylic adhesive, but not limited thereto, and can also be other pressure-sensitive adhesive materials that can meet the bonding needs.

[0044] In the display device, the acrylic adhesive has the advantages of room temperature curing, easy operation, high bonding strength, rapid positioning, etc., and can realize the rapid fixation of the ultrasonic fingerprint identification module 100 and the OLED display module 200, and is easy to operate and has good stability.

[0045] For example, the adhesive layer can be a pressure-sensitive adhesive, but not limited thereto, and can also be other adhesive materials that can meet the bonding needs. Figure 2As shown, in a preferred embodiment, the OLED display module 200 includes an OLED display panel 210 and a cover glass 220, the laminated structure 300 is arranged on the side of the OLED display panel 210 away from the cover glass 220, the thickness of the OLED display panel 210 is 300-600 μm, and the thickness of the cover glass 220 is 0.4-0.8 mm.

[0046] In the display device, the ultrasonic fingerprint identification module 100 includes a thin film transistor substrate 110 and a copolymer layer 120, a silver metal layer 130, a thin film adhesive 140 and a flexible circuit board 150 arranged in sequence on the thin film transistor substrate 110. During assembly, the laminated structure 300 is arranged on the side of the OLED display panel 210 fixed to the cover glass 220, and the thin film transistor substrate 110 of the ultrasonic fingerprint identification module 100 is fixed to the laminated structure 300. In a specific arrangement, the ultrasonic fingerprint identification module 100 is arranged opposite to a predetermined ultrasonic fingerprint sensing area on the OLED display panel 210, and the area of the ultrasonic fingerprint sensing area is determined according to the area of the ultrasonic fingerprint identification module 100. The area of the ultrasonic fingerprint sensing area can be 4 mm X 9 mm, 8 mm X 8 mm or 20 mm X 30 mm. In a specific arrangement, the thickness of the OLED display panel 210 can be 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, 550 μm or 600 μm, and the thickness of the cover glass 220 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm or 0.8 mm. The thickness of the OLED display panel 210, the thickness of the cover glass 220 and the area of the ultrasonic fingerprint sensing area can be selected according to the specific conditions of the display device. Regardless of the size of the OLED display panel 210, the cover glass 220 and the ultrasonic fingerprint sensing area, the display device formed by using the laminated structure 300 to fix the ultrasonic fingerprint identification module 100 and the OLED display module 200 has good ultrasonic penetration and fingerprint identification effects.

[0047] The display device in the present application can be used in various intelligent terminals, which can be smart phones, smart bracelets, etc. The display device is arranged in the shell of the intelligent terminal. The display device can make the ultrasonic wave more easily penetrate, improve the ultrasonic penetration effect, and thus has good fingerprint identification effect.

[0048] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0049] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A display device comprising an ultrasonic fingerprint identification module and an OLED display module, characterized in that, The display device also comprises a laminated structure, which comprises a copper foil and adhesive layers arranged on two opposite surfaces of the copper foil, and is arranged between the ultrasonic fingerprint identification module and the OLED display module and adheres the ultrasonic fingerprint identification module and the OLED display module through the adhesive layers. The thickness of the copper foil is 6-12 μm. The thickness of the adhesive layer is 3-10 μm. The thickness of the adhesive layers on the two surfaces of the copper foil is the same. The laminated structure can be peeled off from the display device, so that the display device can be reworked when the adhesion is poor.

2. The display device according to claim 1, wherein The thickness of the copper foil is 7 μm, and the thickness of the adhesive layer is 6 μm.

3. The display device according to claim 1, wherein The adhesive layer is a pressure-sensitive adhesive.

4. The display device according to claim 3, wherein The pressure-sensitive adhesive is acrylic adhesive.

5. The display device according to any one of claims 1 to 4, characterized by The OLED display module comprises an OLED display panel and a cover glass, the laminated structure is arranged on a side of the OLED display panel away from the cover glass, the thickness of the OLED display panel is 300-600 μm, and the thickness of the cover glass is 0.4-0.8 mm.

6. A smart terminal, characterized by The display device comprises the display device and a shell according to any one of claims 1-5.

Images