TWI603179B - Electrical device - Google Patents

Description

Electronic device

The present invention relates to an electronic device.

At present, electronic devices such as smart phones and tablet computers often use fingerprint recognition sensors to implement functions such as data protection, identity authentication, and program control. However, the existing fingerprint recognition sensor is permanently placed around the display area of the electronic device, and the electronic device needs to reserve a space for the fingerprint recognition sensor in the frame area outside the display area, which causes the frame of the electronic device to increase, which is disadvantageous for narrowing. Border design.

In view of the above, it is necessary to provide an electronic device that is advantageous for a narrow bezel design.

An electronic device includes: a display module, the display module includes a display surface facing the user, the display surface defines a display area and a non-display area; an ultrasonic fingerprint identification component corresponding to the display area And disposed on a side of the display module away from the display area; and a shielding layer disposed between the ultrasonic fingerprint identification component and the display module to shield light.

Compared with the prior art, the ultrasonic fingerprint identification component of the present invention is disposed on the other side of the display module corresponding to the display area, so that the ultrasonic fingerprint is not required to be reserved in the frame area outside the display area. The identification component does not increase the frame area of the electronic device, and is advantageous for a narrow bezel or a frameless design.

10,20,30‧‧‧Electronic devices

11,21,31‧‧‧ display module

110,210,310‧‧‧ display surface

111,211,311‧‧‧ display area

112,212,312‧‧‧ Non-display area

12,22,32‧‧‧ Ultrasonic fingerprint identification components

124,224,324‧‧‧ adjacent faces

121,221,321‧‧‧substrate

122,222,322‧‧‧Signal receiving layer

1220, 2220, 3220‧‧‧ first substrate

1221, 2221, 3221‧‧‧ first electrode layer

1222, 2222, 3222‧‧‧ first piezoelectric layer

123,223,323‧‧‧Signal transmission layer

1230, 2230, 3230‧‧‧ second substrate

1231, 2231, 3231‧‧‧ second electrode layer

1232, 2232, 3232‧‧‧ second piezoelectric layer

1233, 2233, 3233‧‧‧ third electrode layer

13,2220,33‧‧‧shading

131‧‧‧Part 1

132‧‧‧Part II

24,34‧‧‧ bonding layer

FIG. 1 is a schematic diagram of the appearance of an electronic device according to a first embodiment of the present invention.

2 is a cross-sectional structural view of the electronic device of FIG. 1 along a II-II cutting line.

3 is a schematic cross-sectional view of an electronic device according to a modified embodiment.

4 is a schematic cross-sectional view of an electronic device according to another modified embodiment.

FIG. 5 is a schematic diagram of the appearance of an electronic device according to a second embodiment of the present invention.

6 is a cross-sectional structural view of the electronic device of FIG. 5 taken along line VI-VI.

FIG. 7 is a schematic diagram of the appearance of an electronic device according to a third preferred embodiment of the present invention.

8 is a cross-sectional structural view of the electronic device of FIG. 7 taken along a line VIII-VIII.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein the present invention is described by taking a bottom gate type thin film transistor as an example.

1 and FIG. 2, FIG. 1 is a schematic diagram of the appearance of an electronic device 10 according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional structural view of the electronic device 10 of FIG. 1 along a II-II cutting line. The electronic device 10 of the present embodiment may be a portable device such as a smart phone, a personal digital assistant, or a tablet computer. This embodiment uses a smart phone as an example for description. The electronic device 10 includes a display module 11 , an ultrasonic fingerprint recognition component 12 , and a shielding layer 13 . One side of the display module 11 includes a display surface 110 facing the user, and the display surface 110 defines a display area 111 for displaying an image and a non-display area 112 surrounding the display area 111 (or Called the border area). The ultrasonic fingerprint recognition component 12 is disposed on a side of the display module 11 away from the display surface 110 and is disposed corresponding to the display area 111. The shielding layer 13 is disposed between the ultrasonic fingerprint identification component 12 and the display module 11, and specifically covers the ultrasonic fingerprint recognition component 12 to shield light. The ultrasonic fingerprint recognition component 12 is in communication with the display module 11 via a signal transmission module (not shown).

In addition, the electronic device 10 may further include a sensing instruction unit (not shown). Specifically, the sensing instruction unit may be disposed in the display module 11 and electrically connected to the display module 11 . When the sensing instruction unit is activated, the electronic device 10 is triggered to perform fingerprint sensing. The sensing instruction unit may be an application built in the display module 11 or may be disposed in the non-display area 112. A physical button is activated. In addition, the electronic device 10 may further include a protective layer (not shown) covering the display surface 110 to protect the display surface 110.

The ultrasonic fingerprint identification component 12 can be used for, but not limited to, fingerprint information collection, identity authentication, and unlocking. This embodiment describes fingerprint information collection as an example. The ultrasonic fingerprint identification component 12 has a proximity surface 124 corresponding to the display surface 110, and the proximity surface 124 is the surface of the ultrasonic fingerprint recognition component 12 that is closest to the display module 11. The ultrasonic fingerprint identification component 12 can identify a fingerprint placed on the display area 111 corresponding to the adjacent surface 124, and form image information corresponding to the user fingerprint to be transmitted to the signal transmission module. The signal transmission module outputs the received image information from the ultrasonic fingerprint identification component 12 to the display module 11, and finally displays the fingerprint image in the display area 111.

Further, at least a portion of the adjacent surface 124 overlaps the display area 111. The area of the adjacent surface 124 can be selected according to actual conditions. When the area of the adjacent surface 124 is greater than or equal to the display area 111, fingerprint sensing can be performed by placing a finger at any position of the display area 111. When the area of the adjacent surface 124 is smaller than the display area 111, the finger needs to be placed on the display area 111 corresponding to the adjacent surface 124 for fingerprint sensing. In this embodiment, the area of the adjacent surface 124 is larger than the area of the display area 111. The display module 11 is an OLED display panel.

The ultrasonic fingerprint identification component 12 includes a substrate 121, a signal receiving layer 122, and a signal transmitting layer 123. The signal receiving layer 122 is disposed on a side of the substrate 121 adjacent to the adjacent surface 124, and the signal transmitting layer 123 is disposed on a side of the substrate 121 away from the adjacent surface 124.

The signal receiving layer 122 and the signal transmitting layer 123 may be adhered to the opposite surfaces of the substrate 121 by adhesives (not shown). A plurality of matrix-arranged thin film transistors (TFTs) (not shown) are disposed in the substrate 121, and the plurality of thin film transistors form a thin film transistor array electrically coupled to the signal receiving layer 122, and simultaneously It is also electrically connected to the signal transmission module. The thin film transistor array is configured to receive an electrical signal from the signal receiving layer 122 and to receive the above The electrical signal is converted into image information of the fingerprint. The region where the electrical signal is generated forms the adjacent face 124. The signal transmitting layer 123 is configured to continuously transmit an ultrasonic signal to the signal receiving layer 122.

The signal receiving layer 122 includes a first substrate 1220 and a first electrode layer 1221 and a first piezoelectric layer 1222 laminated on the first substrate 1220. The first substrate 1220 is provided with one side of the first piezoelectric layer 1222 attached to the surface of the substrate 121. In the embodiment, the shielding layer 13 is located between the first substrate 1220 and the display module 11 . The signal transmitting layer 123 includes a second substrate 1230 and a second electrode layer 1231, a second piezoelectric layer 1232, and a third electrode layer 1233 laminated on the second substrate 1230. One side of the second substrate 1230 provided with the third electrode layer 1233 is attached to the surface of the substrate 121. The first and second substrates 1220 and 1230 may be selected from a light-shielding material or a transparent material, and the same material may be selected or different materials may be selected. In the present embodiment, the first and second substrates 1220 and 1230 are transparent films, for example, resin films such as polyamine, polyphenylene sulfide, and polyester.

In the present embodiment, the shielding layer 13 is a light-shielding material having a viscosity, for example, an optical glue to which black resin particles are added. The shielding layer 13 has a thickness of between 1 and 10 μm and an acoustic impedance of between 1.5 and 4 mils to reduce the sensitivity of the shielding layer 13 to the sensing sensitivity of the ultrasonic fingerprinting component 12. In the present embodiment, it is preferable that the light absorption wavelength of the shielding layer 13 is between 380 and 780 nm.

In other modified embodiments, as shown in FIG. 3, the shielding layer 13 further covers the side surface of the ultrasonic fingerprint identification component 12; in another modified embodiment, as shown in FIG. 4, the shielding layer 13 The entire ultrasonic fingerprinting element 12 is further wrapped therein. Specifically, the shielding layer 13 includes a first portion 131 between the ultrasonic fingerprint identification component 12 and the display module 11 and a second surface covering the remaining surfaces of the ultrasonic fingerprint identification component 12 Part 132. Wherein, the first portion 131 and the second portion 132 are both light-shielding. It can be understood that the first portion 131 and the second portion 132 can be selected from the same material, and different materials can also be selected. The first portion 131 has a viscosity. In addition, the thickness of the second portion 132 may be selected to be between 1 and 200 μm. Due to the shading The first and second portions 131, 132 of the layer 13 envelop the entire ultrasonic fingerprinting component 12 to more effectively prevent external light from affecting the sensing sensitivity of the ultrasonic fingerprinting component 12.

When the electronic device 10 is used for fingerprint sensing, the sensing instruction unit is first activated to cause the display module 11 to enter a mode of sensing fingerprints. At this time, when a finger is placed on the adjacent surface 124 When the display area 111 is displayed, the fingerprint image of the finger is displayed in the display area 111. Specifically, when the ultrasonic fingerprint identification component 12 is in operation, the second electrode layer 1231 and the third electrode layer 1233 apply a voltage to the second piezoelectric layer 1232, and the second piezoelectric layer The 1232 generates vibration under the action of a voltage to emit ultrasonic waves. When a finger is placed on the ultrasonic fingerprint identification element 12, the portion of the ultrasonic wave transmitted to the finger is reflected to the signal receiving layer 122, which is affected by the shape of the valley and the ridge on the finger fingerprint, and the reflected ultrasonic wave occurs. Corresponding changes cause a corresponding change in the vibration of the first piezoelectric layer 1222 to generate an electrical signal corresponding to the user's fingerprint and transmitted to the thin film transistor array through the first electrode layer 1221. The image of the thin film transistor array that converts the electrical signal into a fingerprint is transmitted to the signal transmission module, and then transmitted to the display module 11 through the signal transmission module, and finally to the display module 11 A fingerprint image corresponding to the user's finger is presented.

Since the ultrasonic fingerprint identification component 12 is disposed directly below the display area 111, there is no need to reserve the space in the non-display area 112 to place the ultrasonic fingerprint identification component 12, and the electronic device 10 is not added. The frame area is advantageous for the narrow border or borderless design of the electronic device 10. In addition, due to the presence of the shielding layer 13, the light of the display module 11 is reduced to affect the sensing sensitivity of the ultrasonic fingerprint identification component 12.

5 and FIG. 6, FIG. 5 is a schematic diagram of the appearance of the electronic device 20 according to the second embodiment of the present invention, and FIG. 6 is a cross-sectional structural view of the electronic device 20 of FIG. The electronic device 20 of the present embodiment may be a portable device such as a smart phone, a personal digital assistant, or a tablet computer. This embodiment uses a smart phone as an example for description. The electronic device 20 includes a display module 21, an ultrasonic fingerprint recognition component 22, and an adhesive layer 24. Wherein, one side of the display module 21 includes a user facing The display surface 210 defines a display area 211 for displaying an image and a non-display area 212 (or a border area) surrounding the display area 211. The ultrasonic fingerprint recognition component 22 is disposed on a side of the display module 21 away from the display surface 210 and is disposed corresponding to the display area 211. The adhesive layer 24 is used to bond the ultrasonic fingerprint identification element and the display module 21 together. The adhesive layer 24 is an optical glue. The ultrasonic fingerprint recognition component 22 is in communication with the display module 21 via a signal transmission module (not shown). In addition, the electronic device 20 can further include a sensing instruction unit (not shown). Specifically, the sensing instruction unit can be disposed in the display module 21 and electrically connected to the display module 21 when When the sensing instruction unit is activated, the electronic device 20 is triggered to perform fingerprint sensing. The sensing command unit may be an application built in the display module 21 or may be activated by a physical button disposed in the non-display area 212. In addition, the electronic device 20 may further include a protective layer (not shown) covering the display surface 210 to protect the display surface 210.

The ultrasonic fingerprint identification component 22 can be used for, but not limited to, fingerprint information collection, identity authentication, and unlocking. This embodiment describes fingerprint information collection as an example. The ultrasonic fingerprint identification component 22 has a proximity surface 224 corresponding to the display surface 210, and the proximity surface 224 is the surface of the ultrasonic fingerprint recognition component 22 that is closest to the display module 21. The ultrasonic fingerprint identification component 22 can identify a fingerprint placed on the display area 211 corresponding to the adjacent surface 224, and form image information corresponding to the user fingerprint to be transmitted to the signal transmission module. The signal transmission module outputs the received image information from the ultrasonic fingerprint identification component 22 to the display module 21, and finally displays the fingerprint image in the display area 211. Further, at least a portion of the adjacent surface 224 overlaps the display area 211. The area of the adjacent surface 224 can be selected according to actual conditions. When the area of the adjacent surface 224 is greater than or equal to the display area 211, fingerprint sensing can be performed by placing a finger at any position of the display area 211. When the area of the adjacent surface 224 is smaller than the display area 211, the finger needs to be placed above the display area 211 corresponding to the adjacent surface 224 for fingerprint sensing. In this embodiment, the The area of the adjacent face 224 is larger than the area of the display area 211. The display module 21 is an OLED display area 211 board.

The ultrasonic fingerprint identification component 22 includes a substrate 221, a signal receiving layer 222, and a signal transmitting layer 223. The signal receiving layer 222 is disposed on a side of the substrate 221 adjacent to the adjacent surface 224, and the signal transmitting layer 223 is disposed on a side of the substrate 221 away from the adjacent surface 224.

The signal receiving layer 222 and the signal transmitting layer 223 may be adhered to the opposite surfaces of the substrate 221 by adhesives (not shown). A plurality of matrix-arranged thin film transistors (TFTs) (not shown) are disposed in the substrate 221, and the plurality of thin film transistors form a thin film transistor array electrically coupled to the signal receiving layer 222, and simultaneously It is also electrically connected to the signal transmission module. The thin film transistor array is configured to receive an electrical signal from the signal receiving layer 222 and convert the received electrical signal into image information of a fingerprint. The region in which the electrical signal is generated forms the adjacent face 224. The signal transmitting layer 223 is for continuously transmitting an ultrasonic signal to the signal receiving layer 222.

The signal receiving layer 222 includes a first substrate 2220 and a first electrode layer 2221 and a first piezoelectric layer 2222 laminated on the first substrate 2220. The first substrate 2220 is provided with one side of the first piezoelectric layer 2222 attached to the surface of the substrate 221. In the embodiment, the adhesive layer 24 is located between the first substrate 2220 and the display module 21 . The signal transmitting layer 223 includes a second substrate 2230 and a second electrode layer 2231, a second piezoelectric layer 2232, and a third electrode layer 2233 laminated on the second substrate 2230. One side of the second substrate 2230 provided with the third electrode layer 2233 is attached to the surface of the substrate 221.

The first substrate 2220 is a light-shielding material, and the first substrate 2220 forms a shielding layer 2220 for shielding light from the display module 21, thereby reducing light to the ultrasonic fingerprint recognition component 22 The sensitivity of the sensing has an effect. In the present embodiment, the first substrate 2220 is an ink material, but is not limited thereto. The first substrate 2220 has a thickness of between 1 and 10 μm and an acoustic impedance of between 1.5 and 4 mils to reduce the sense of the first substrate 2220 on the ultrasonic fingerprinting component 22 . The sensitivity of the measurement has an effect. In the present embodiment, it is preferable that the first substrate 2220 has a light absorption wavelength of between 380 and 780 nm. The second substrate 2230 may be selected from the same material as the first substrate 2220, or different materials may be selected.

In other modified embodiments (not shown), the obscuring layer 2220 further covers the side of the ultrasonic fingerprinting element 22. In another variant embodiment, the obscuring layer 2220 further encloses the entire ultrasonic fingerprinting element 22 therein. Specifically, the shielding layer 2220 includes a portion between the ultrasonic fingerprint identification component 22 and the display module 21, that is, the first substrate 2220, and the ultrasonic fingerprint recognition Another portion of the remaining faces of element 22. Wherein, the two parts can be selected from the same material, and different materials can be selected, but the two parts are all light-shielding. The thickness of the partial shielding layer 2220 located on the side of the ultrasonic fingerprinting element 22 can be selected to be between 1 and 200 μm. It can be understood that when the second substrate 2230 also selects a light-shielding material, the shielding layer 2220 may include only a portion of the first substrate 2220 and cover each side of the ultrasonic fingerprinting element 22. part. When the second substrate 2230 selects a non-light-shielding material, the shielding layer 2220 includes a portion of the first substrate 2220 and covers each side of the ultrasonic fingerprinting element 22 and away from the adjacent surface 224. The part of the bottom surface. When the electronic device 20 is used for fingerprint sensing, the sensing instruction unit is first activated to cause the display module 21 to enter a mode of sensing fingerprints. At this time, when a finger is placed on the adjacent surface 224 When the display area 211 is displayed, the fingerprint image of the finger is displayed in the display area 211. Specifically, when the ultrasonic fingerprint identification component 22 is in operation, the second electrode layer 2231 and the third electrode layer 2233 apply a voltage to the second piezoelectric layer 2232, and the second piezoelectric layer 2232 generates vibration under the action of voltage to emit ultrasonic waves. When a finger is placed on the ultrasonic fingerprint identification element 22, the portion of the ultrasonic wave transmitted to the finger is reflected to the signal receiving layer 222, which is affected by the shape of the valley and the ridge on the finger fingerprint, and the reflected ultrasonic wave occurs. Corresponding changes cause a corresponding change in the vibration of the first piezoelectric layer 2222, thereby generating an electrical signal corresponding to the user's fingerprint and transmitting to the thin film transistor array through the first electrode layer 2221. The film The image information of the transistor array that converts the electrical signal into a fingerprint is transmitted to the signal transmission module, and then transmitted to the display module 21 through the signal transmission module, and finally corresponding to the display module 21 A fingerprint image of the user's finger.

Since the ultrasonic fingerprint identification component 22 is disposed directly below the display area 211, there is no need to reserve the space in the non-display area 212 to place the ultrasonic fingerprint identification component 22, and the electronic device 20 is not added. The frame area is advantageous for the narrow border or borderless design of the electronic device 20.

7 and FIG. 8 , FIG. 7 is a schematic diagram of the appearance of the electronic device 30 according to the third embodiment of the present invention, and FIG. 8 is a schematic cross-sectional structural view of the electronic device 30 of FIG. 7 along the V-V cutting line. The electronic device 30 of the present embodiment may be a portable device such as a smart phone, a personal digital assistant, or a tablet computer. This embodiment uses a smart phone as an example for description. The electronic device 30 includes a display module 31, an ultrasonic fingerprint recognition component 32 shielding layer 33, and an adhesive layer 34. One side of the display module 31 includes a display surface 310 facing the user, and the display surface 310 defines a display area 311 for displaying an image and a non-display area 312 surrounding the display area 311 (or Called the border area). The ultrasonic fingerprint recognition component 32 is disposed on a side of the display module 31 away from the display surface 310 and is disposed corresponding to the display area 311. The ultrasonic fingerprint recognition component 32 is in communication with the display module 31 via a signal transmission module (not shown). The shielding layer 33 covers the ultrasonic fingerprinting component 32 to block light from the display module 31. The adhesive layer 34 is located around the shielding layer 33 for bonding the ultrasonic fingerprint identification element and the display module 31 together. In addition, the electronic device 30 can further include a sensing instruction unit (not shown). Specifically, the sensing instruction unit can be disposed in the display module 31 and electrically connected to the display module 31. When the sensing instruction unit is activated, the electronic device 30 is triggered to perform fingerprint sensing. The sensing instruction unit may be an application built in the display module 31 or may be activated by a physical button disposed in the non-display area 311. In addition, the electronic device 20 may further include a protective layer (not shown) covering the display surface 310 to protect the display surface 310.

Further, the shielding layer 33 is disposed between the ultrasonic fingerprint identification unit and the display module 31 and corresponding to the display area 311. Correspondingly, the bonding layer 34 may be located in a region corresponding to the non-display area 311. The bonding layer 34 is an optical adhesive layer. The shielding layer 33 may be selected from, but not limited to, a black resin, an ink, or the like. The shielding layer 33 has a thickness of between 1 and 10 μm and an acoustic impedance of between 1.5 and 4 megahertz to reduce the sensitivity of the shielding layer 33 to the sensing sensitivity of the ultrasonic fingerprinting component 32. In the present embodiment, it is preferable that the light absorption wavelength of the shielding layer 33 is between 380 and 780 nm. In other embodiments, the shielding layer 33 includes a portion between the ultrasonic fingerprint identification component 32 and the display module 31 and a portion covering the remaining surfaces of the ultrasonic fingerprint identification component 32. . Among them, the two parts can be selected from the same material, and different materials can be selected, but all have light shielding properties. The thickness of the partial shielding layer 33 located on the side of the ultrasonic fingerprinting element 32 may be selected to be between 1 and 200 μm.

The ultrasonic fingerprint identification component 32 can be used for, but not limited to, fingerprint information collection, identity authentication, and unlocking. This embodiment describes fingerprint information collection as an example. The ultrasonic fingerprint identification component 32 has a proximity surface 324 corresponding to the display surface 310. The ultrasonic fingerprint identification component 32 can identify a fingerprint placed on the display area 311 corresponding to the adjacent surface 324, and form image information corresponding to the user fingerprint to be transmitted to the signal transmission module. The signal transmission module outputs the received image information from the ultrasonic fingerprint identification component 32 to the display module 31, and finally displays the fingerprint image in the display area 311.

Further, at least a portion of the adjacent surface 324 overlaps the display area 311. The area of the adjacent surface 324 can be selected according to actual conditions. When the area of the adjacent surface 324 is greater than or equal to the display area 311, fingerprint sensing can be performed by placing a finger at any position of the display area 311. When the area of the adjacent surface 324 is smaller than the display area 311, the finger needs to be placed above the display area 311 corresponding to the adjacent surface 324 for fingerprint sensing. In this embodiment, the area of the adjacent surface 324 is larger than the area of the display area 311. The display module 31 is an OLED display area 311 board.

The ultrasonic fingerprint identification component 32 includes a substrate 321, a signal receiving layer 322, and a signal transmitting layer 323. The signal receiving layer 322 is disposed on a side of the substrate 321 adjacent to the adjacent surface 324, and the signal transmitting layer 323 is disposed on a side of the substrate 321 away from the adjacent surface 324. The signal receiving layer 322 and the signal transmitting layer 323 may be adhered to opposite surfaces of the substrate 321 by adhesives (not shown). A plurality of matrix-arranged thin film transistors (TFTs) (not shown) are disposed in the substrate 321 , and the plurality of thin film transistors form a thin film transistor array electrically coupled to the signal receiving layer 322 It is also electrically connected to the signal transmission module. The thin film transistor array is configured to receive an electrical signal from the signal receiving layer 322 and convert the received electrical signal into image information of a fingerprint. The area where the electrical signal is generated forms the adjacent face 324. The signal transmitting layer 323 is configured to continuously transmit an ultrasonic signal to the signal receiving layer 322.

The signal receiving layer 322 includes a first substrate 3220 and a first electrode layer 3221 and a first piezoelectric layer 3222 laminated on the first substrate 3220. The first substrate 3220 is provided with one side of the first piezoelectric layer 3222 attached to the surface of the substrate 321, and the first substrate 3220 is provided with one side of the first electrode layer 3221 attached thereto. The surface of the substrate 321 is described. Therefore, the shielding layer 33 is actually located between the first substrate 3220 and the display module 31. The signal transmitting layer 323 includes a second substrate 3230 and a second electrode layer 3231, a second piezoelectric layer 3232, and a third electrode layer 3233 laminated on the second substrate 3230. The second substrate 3230 is provided with one side of the third electrode layer 3233 attached to the bottom surface 3212 of the substrate 321 . In the present embodiment, the first and second substrates 3220 and 3230 are transparent films, for example, resin films such as polyamine, polyphenylene sulfide, and polyester.

When the electronic device 30 is used for fingerprint sensing, the sensing instruction unit is first activated to cause the display module 31 to enter a mode of sensing a fingerprint. At this time, when a finger is placed on the adjacent surface 324 When the display area 311 is on, the fingerprint image of the finger is displayed in the display area 311. Specifically, when the ultrasonic fingerprint identification component 32 is in operation, the second electrode layer 3231 and the third electrode layer 3233 apply a voltage to the second piezoelectric layer 3232, and the second piezoelectric layer 3232 in voltage Vibrates under the action to emit ultrasonic waves. When a finger is placed on the ultrasonic fingerprint identification element 32, the portion of the ultrasonic wave transmitted to the finger is reflected to the signal receiving layer 322, which is affected by the shape of the valley and the ridge on the finger fingerprint, and the reflected ultrasonic wave occurs. Corresponding changes cause a corresponding change in the vibration of the first piezoelectric layer 3222 to generate an electrical signal corresponding to the user's fingerprint and transmitted to the thin film transistor array through the first electrode layer 3221. The image of the thin film transistor array that converts the electrical signal into a fingerprint is transmitted to the signal transmission module, and then transmitted to the display module 31 through the signal transmission module, and finally to the display module 31. A fingerprint image corresponding to the user's finger is presented.

Since the ultrasonic fingerprint identification component 32 is disposed directly below the display area 311, there is no need to reserve the space in the non-display area 311 to place the ultrasonic fingerprint identification component 32, and the electronic device 30 is not added. The frame area is advantageous for the narrow border or borderless design of the electronic device 30. In addition, due to the presence of the shielding layer 33, the light of the display module 31 can be reduced to affect the sensing sensitivity of the ultrasonic fingerprint identification component 32.

In summary, the creation meets the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and those skilled in the art will be equivalently modified or changed according to the spirit of the present invention. It should be covered by the following patent application.

10‧‧‧Electronic devices

11‧‧‧Display module

110‧‧‧ display surface

111‧‧‧ display area

112‧‧‧Non-display area

12‧‧‧ Ultrasonic fingerprint identification component

124‧‧‧ adjacent faces

121‧‧‧Substrate

122‧‧‧Signal receiving layer

1220‧‧‧First substrate

1221‧‧‧First electrode layer

1222‧‧‧First piezoelectric layer

123‧‧‧Signal transmission layer

1230‧‧‧second substrate

1231‧‧‧Second electrode layer

1232‧‧‧Second piezoelectric layer

1233‧‧‧ third electrode layer

13‧‧‧Shielding layer

Claims (10)

An electronic device, comprising: a display module, the display module includes a display surface, the display surface defines a display area and a non-display area; an ultrasonic fingerprint identification component, corresponding to the display area setting and setting The display module is disposed away from the side of the display surface; and the shielding layer is disposed between the ultrasonic fingerprint identification component and the display module to block the light; the display module is an OLED display panel. The electronic device of claim 1, wherein the shielding layer is viscous to bond the ultrasonic fingerprinting component and the display module together. The electronic device of claim 1, wherein the ultrasonic fingerprint identification component and the display module are bonded together by a bonding layer. The electronic device of claim 1, wherein the shielding layer has a thickness of between 1 and 10 μm. The electronic device of claim 1, wherein the shielding layer has an acoustic impedance of between 1.5 and 4 megahertz. The electronic device of claim 1, wherein the shielding layer has a light absorption wavelength of between 380 and 780 nm. The electronic device of claim 1, wherein the shielding layer is made of black resin or ink. The electronic device of claim 1, wherein an area of the adjacent surface of the ultrasonic fingerprint recognition component and the display module is greater than or equal to an area of the display area. The electronic device of claim 1, wherein the obscuring layer further encapsulates the entire ultrasonic fingerprinting component. The electronic device of claim 1, wherein the ultrasonic fingerprint identification component comprises a substrate and a signal receiving layer disposed on a side of the substrate adjacent to the display module, the signal receiving layer comprising the first a substrate and a first electrode formed on a side of the first substrate, the first substrate having one side of the first electrode attached to one side of the substrate, and the first substrate is selected from a light shielding property Material to form the obscuring layer.