CN106462740A - Terminal device - Google Patents

Abstract

A terminal device comprises a cover plate (101), a fingerprint identification module (102) and a control unit (104); the cover plate (101) is positioned on one side of the terminal equipment; the fingerprint identification module (102) is arranged below the cover plate (101) and electrically connected with the control unit (104) and is used for identifying fingerprints on the cover plate (101) corresponding to the fingerprint identification module (102); the control unit (104) is used for performing authentication processing according to the fingerprint identified by the fingerprint identification module (102); wherein the cover plate (101) is made of a material with a first preset dielectric constant, and the thickness of the panel corresponding to the fingerprint identification module (102) is a preset value. In the embodiment of the invention, the fingerprint identification module (102) is arranged below the cover plate (101), and a through hole does not need to be formed in the cover plate (101), so that the influence of liquid, dust and the like on the fingerprint identification module (102) can be obviously avoided, and the reliability of fingerprint identification is ensured.

Description

Terminal Equipment

technical field

The present invention relates to a terminal device, in particular to a fingerprint-identifiable terminal device.

Background technique

Taking mobile phones as an example, terminal devices usually have a fingerprint recognition function.

Such mobile phones with fingerprint recognition function have appeared on the market: punch a through hole on the cover of the mobile phone, set physical buttons in the through hole, combine the fingerprint recognition module with the physical buttons, so that users can press the physical button At the same time, fingerprint identification is performed by the fingerprint identification module so that the control unit can perform authentication processing.

However, punching through holes on the cover cannot fundamentally prevent liquids, dust, etc. from penetrating through the gap between the through holes and the physical keys to affect the fingerprint recognition module, thereby affecting the reliability of fingerprint recognition.

Contents of the invention

An embodiment of the present invention provides a terminal device capable of identifying fingerprints, so as to ensure the reliability of fingerprint identification.

In a first aspect, an embodiment of the present invention provides a terminal device, including a cover, a fingerprint recognition module, and a control unit;

The cover plate is located on one side of the terminal device;

The fingerprint identification module is arranged under the cover plate and is electrically connected to the control unit for identifying the fingerprint implemented on the cover plate corresponding to the fingerprint identification module;

The control unit is configured to perform authentication processing according to the fingerprint identified by the fingerprint identification module;

Wherein, the cover plate is made of a material with a dielectric constant of a first preset value, and the panel corresponds to a part of the fingerprint identification module, and its thickness is a preset value.

In a first possible implementation manner of the first aspect, the terminal device further includes a display panel; the display panel is disposed under the first area of the cover, and correspondingly, the fingerprint recognition module is disposed on A set position under the second area of the cover plate.

With reference to the first aspect, or the first possible implementation of the first aspect, in the second possible implementation, the part of the cover corresponding to the fingerprint recognition module is provided with a blind hole, and the blind hole The opening faces the side away from the fingerprint identification module.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a third possible implementation manner, the cover plate corresponds to the part of the fingerprint identification module, and its thickness is the same as that of other parts of the cover plate. The difference in thickness of the parts is smaller than a preset value.

With reference to the first aspect, or any one of the first to third possible implementation manners of the first aspect, in a fourth possible implementation manner, the cover plate is made of transparent glass.

With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, a prompt identification layer is included between the cover plate and the fingerprint recognition module.

With reference to the fourth possible implementation manner of the first aspect, in a sixth possible implementation manner, an ink layer having a dielectric constant of a second preset value is included between the cover plate and the fingerprint identification module.

With reference to the fifth possible implementation manner of the first aspect, in a seventh possible implementation manner, an ink layer with a dielectric constant of a second preset value is further included, and the ink layer is located between the reminder mark layer and the between fingerprint identification modules.

In combination with any one of the first to seventh possible implementations of the first aspect, in the eighth possible implementation, the fingerprint identification module is pasted with an adhesive whose dielectric constant is a third preset value. Closed in the set position under the cover plate.

With reference to the first aspect, or any one of the first to eighth possible implementations of the first aspect, in a ninth possible implementation, the terminal device further includes a printed circuit board, and the fingerprint recognition module passes The printed circuit board is electrically connected with the control unit.

In a tenth possible implementation manner of the first aspect, the terminal device further includes a display panel; and the cover plate is located on the opposite side of the display panel.

In the embodiment of the present invention, the fingerprint identification module is arranged under the cover plate without drilling holes on the cover plate, which obviously can avoid the influence of liquid, dust, etc. on the fingerprint identification module and ensure the reliability of fingerprint identification.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a front view of a terminal device in Embodiment 1;

Fig. 2 is a sectional view along the A-A direction of Fig. 1;

FIG. 3 is a front view of the terminal device in Embodiment 2;

Fig. 4 is the sectional view along A-A direction in Fig. 3;

Fig. 5 is a cross-sectional view of the terminal device in the third embodiment.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The embodiment of the present invention relates to a terminal device capable of fingerprint identification. The terminal device may include, but is not limited to, a mobile phone, a tablet computer, a PDA (Personal Digital Assistant, personal digital assistant), a POS (Point of Sales, sales terminal), a vehicle-mounted computer, and the like.

Embodiment one

Fig. 1 shows a front view of a terminal device according to an embodiment of the present invention, and Fig. 2 is a schematic cross-sectional view along the direction A-A in Fig. 1 . Although FIG. 1 uses a mobile phone as an example of a terminal device for description, this does not constitute a limitation thereto.

Referring to FIG. 1 and FIG. 2 , the mobile phone 100 includes a cover 101 , a fingerprint recognition module 102 located under the cover 101 , a printed circuit board 103 , and a control unit 104 .

The cover plate 101 is usually arranged on the front of the mobile phone 100 and can be used to protect the display panel and other components of the mobile phone. Referring to FIG. 1 , the cover plate 101 can be divided into an area 1011 and an area 1012 , a display panel can be installed under the area 1011 , and a fingerprint identification module 102 can be installed at a set position under the area 1012 . Preferably, the cover plate can be made of glass, sapphire, resin and other materials.

The fingerprint identification module 102 is disposed under the cover 101 and is used for identifying fingerprints applied by the user on the cover 101 corresponding to the fingerprint identification module 102 . Preferably, the fingerprint identification module 102 is arranged below the center of the bottom edge of the area 1012 of the cover 101, so that when the user holds the mobile phone, the fingerprint applied to the thumb on the cover by the user can be recognized by the corresponding fingerprint identification module. . Although most users are accustomed to using the fingerprint of the thumb for identification and authentication, this does not exclude other fingers of the user from being identified and authenticated. Of course, those skilled in the art can also arrange the fingerprint identification module at other locations as required.

The fingerprint recognition module 102 in the embodiment of the present invention includes at least a capacitive fingerprint sensor. Specifically, the difference from the existing capacitive fingerprint sensor is that the fingerprint sensor chip included in the capacitive fingerprint sensor does not need to be plastic-packed, but is attached to the above-mentioned set position under the cover plate 101 . Optionally, it can be attached to the above set position under the cover plate 101 by an adhesive. After the fingerprint recognition module 102 recognizes the user's fingerprint, it collects the fingerprint image, and performs image processing on the collected fingerprint image, such as binarization, feature point extraction, etc., converts it into fingerprint data, and sends it to the control unit 103. Preferably, the fingerprint identification module 102 also includes a reinforcement plate for structural reinforcement of the fingerprint sensor, which will not be repeated here.

The control unit 103 is configured to perform authentication processing according to the fingerprint data identified by the fingerprint identification module. Usually, the control unit 103 compares the received fingerprint data with the fingerprint data stored in the mobile phone, and performs corresponding processing according to the comparison result. Optionally, the control unit 104 may be a microprocessor, a baseband chip and the like.

Referring to FIG. 2 , the fingerprint identification module 102 is electrically connected to the printed circuit board 104 . Preferably, the fingerprint sensor can be electrically connected to the printed circuit board 104 through an FPC (Flexible Printed Circuit, flexible circuit board). Furthermore, one end of the FPC is connected to the fingerprint sensor, and the other end is electrically connected to the printed circuit board 104 through RDL (redistribution layer, redistribution layer) and solder ball soldering lead-out electrodes. Optionally, the control unit 103 is located on the printed circuit board 104 , so that the fingerprint identification module 102 can be electrically connected to the control unit 103 through the printed circuit board 104 . Of course, the fingerprint identification module 102 may not be electrically connected to the control unit 103 through a printed circuit board, which is not limited in the present invention.

The cover plate 101 in the embodiment of the present invention can have the same thickness H ₁ , that is to say, the thickness of the part of the cover plate 101 corresponding to the fingerprint identification module 102 and the thickness of other parts of the cover plate 101 can both be H ₁ , taking into account the processing accuracy of the cover plate, the difference between the two can be less than a preset value. In addition, the dielectric constant of the cover plate 101 is ε ₁ .

Those skilled in the art should know that when the user presses the finger on the cover, the finger and the capacitive sensor are equivalent to two capacitive plates, and the cover between the finger and the surface of the capacitive sensor is equivalent to the medium between the capacitive plates. Capacitive sensors collect fingerprint images by using the capacitance difference between the ridges and valleys of the fingerprint lines relative to the sensor to form, for example, an 8-bit grayscale image.

Those skilled in the art should know that capacitance C=(ε*S)/d. Where ε is the dielectric constant of the medium between the capacitor plates, s is the relative coverage area of the capacitor plates, and d is the distance between the capacitor plates. In the embodiment of the present invention, considering the main factors affecting the capacitance value, ε may be the dielectric constant ε ₁ of the cover 101 , S may be the surface area s of the sensor 1021 , and d may be the thickness H ₁ of the cover 101 . Usually, after the sensor is selected, its surface area is constant, so according to the formula C=(ε ₁ *s)/H ₁ , it can be known that the capacitance value is affected by the dielectric constant ε ₁ of the cover plate and the thickness H ₁ of the cover plate, That is to say, as long as the dielectric constant ε ₁ of the cover plate and the thickness H ₁ of the cover plate meet the preset values, the capacitance value can reach a certain value, and fingerprints can be reliably identified.

In the embodiment of the present invention, the fingerprint identification module is arranged under the cover plate without drilling holes on the cover plate, which can obviously avoid the influence of liquid, dust, etc. on the fingerprint identification module and ensure the reliability of fingerprint identification. , can improve the appearance aesthetic feeling of the whole machine, and improve the structural strength of the cover plate.

Embodiment two

Embodiment 2 is a further optimization based on Embodiment 1. The same or similar content will not be repeated in this embodiment. Please refer to the description of Embodiment 1.

Referring to FIG. 3 and FIG. 4 , the cover plate 101 has a blind hole 1013 at a position corresponding to the fingerprint identification module 102 . The opening of the blind hole 1013 faces the side away from the fingerprint identification module. Preferably, the blind hole 1013 is located in the middle of the bottom of the area 1012, and the fingerprint identification module 102 is located below the blind hole 1013, so that when the user holds the mobile phone, the thumb can be conveniently located in the blind hole 1013, thereby allowing the fingerprints under the blind hole to The identification module 102 identifies fingerprints. Although most users are accustomed to using the fingerprint of the thumb for identification and authentication, this does not exclude other fingers of the user for identification and authentication. Of course, those skilled in the art can also arrange the blind hole and the fingerprint identification module under the blind hole at other positions as required.

Specifically, the above-mentioned blind hole can be obtained by reducing the thickness of the local area to a set thickness through processes such as corrosion, CNC (Computer numerical control, numerical control machine tool) processing, or laser ablation. `

In the embodiment of the present invention, the blind hole 1013 is provided with a good degree of recognition, and the user can easily know the position where fingerprint identification can be performed. More importantly, because the blind hole reduces the thickness of the part of the cover plate corresponding to the fingerprint identification module, the sensitivity of fingerprint identification can be ensured, and the overall thickness of other parts of the cover plate 101 is not highly required. With reference to the formula capacitance C=(ε*S)/d among the embodiment one, under the certain situation of dielectric constant ε and area, capacitance size is inversely proportional to the distance between the capacitance plates, the smaller the distance, the larger the capacitance, This means that the sensor sensitivity is more sensitive. In this embodiment, referring to FIG. 4, the distance between the two capacitive plates of the finger and the sensor is mainly the distance h between the bottom of the blind hole 1013 and the surface of the sensor. Obviously, the size of h is smaller than the overall thickness _H2 of the cover plate 101. , then the sensitivity of fingerprint recognition will be higher than that without blind holes.

When the existing cover glass is used for the cover plate 101, it has better practical significance to open a blind hole on the cover glass at a position corresponding to the fingerprint identification module. Those skilled in the art can know that the thickness H ₂ of the existing cover glass is 0.55-0.7 mm, and the dielectric constant ε ₂ is usually around 7. Due to the small area of the sensor, according to the formula capacitance C=(ε*S)/d in the first embodiment, it can be concluded that the capacitance value is relatively small, so the sensitivity of the sensor is low, and it is difficult to meet the requirement of clearly identifying fingerprints. After the blind hole is opened on the cover glass corresponding to the position of the fingerprint identification module, refer to Figure 4, the distance h from the sensor at the bottom of the blind hole, for example, is 0.3mm, which is obviously smaller, and the obtained capacitance value is obviously larger. Then the sensitivity of the sensor is significantly improved, which meets the needs of clearly identifying fingerprints.

In the embodiment of the present invention, the fingerprint identification module is arranged under the cover plate, and there is no need to drill holes on the cover plate. Obviously, the influence of liquid, dust, etc. on the fingerprint identification module can be avoided to ensure the reliability of fingerprint identification. In addition, The appearance aesthetic feeling of the whole machine can be improved, and the structural strength of the cover plate can be improved.

Furthermore, in the embodiment of the present invention, a blind hole is provided on the part of the cover plate corresponding to the fingerprint recognition module, which reduces the thickness of the part, so that the distance between the user's finger and the fingerprint recognition module is significantly reduced, and the fingerprint recognition module can be improved. Recognition sensitivity. In addition, the setting of blind holes has good recognition, so that users can easily know the position where fingerprint recognition can be performed.

Embodiment Three

Embodiment 3 is a further optimization based on Embodiment 1 and Embodiment 2. The same or similar content will not be repeated in this embodiment. Please refer to the description of Embodiment 1 and Embodiment 2.

Referring to FIG. 5 , between the cover plate 101 and the fingerprint identification module 102 , there are layered in sequence a reminder mark layer 105 , a high dielectric ink layer 106 , and a high dielectric adhesive layer 107 .

The prompting layer 105 may have a specific color, or a specific pattern, or both. The purpose is to better remind the user of the fingerprint recognition position when the cover plate 101 is made of a transparent material, such as the existing cover glass.

Specifically, an NCVM (Non-Conductive Vacuum Metalize, non-conductive vacuum plating) process can be used to coat the prompt identification layer 105 between the cover plate 101 and the fingerprint identification module 102 .

The high-dielectric ink layer 106 is an ink layer with a relatively high dielectric constant, such as a dielectric constant of 5-7, for improving the sensitivity of fingerprint recognition. As mentioned above, the sensitivity of the sensor is positively related to the capacitance, and Capacitance is proportional to permittivity.

Specifically, metal oxides such as titanium oxide and zirconium oxide can be added to ordinary ink to increase the value of the dielectric constant. It should be noted that although a higher dielectric constant helps to improve the sensitivity of fingerprint recognition, if too much metal is added, it is easy to form a metal shield, which will affect the sensitivity of fingerprint recognition.

The high-dielectric adhesive layer 107 is an adhesive layer with a relatively high dielectric constant, such as a dielectric constant of 7-8, which can improve the fingerprint identification while bonding the fingerprint recognition module 102 under the cover plate 101. The sensitivity of recognition is the same as above. The sensitivity of the sensor is proportional to the capacitance, and the sensing capacitance is proportional to the dielectric constant.

Specifically, metal oxides such as titanium oxide and zirconium oxide can be added to ordinary binders to increase the value of the dielectric constant. It should be noted that although a higher dielectric constant helps to improve the sensitivity of fingerprint recognition, if too much metal is added, it is easy to form a metal shield, which will affect the sensitivity of fingerprint recognition.

A screen printing ink layer 108 is also included under the cover plate 101 , which is located under the area 1012 of the cover glass for decorative shielding and preventing light leakage. Since this is an existing setting, it will not be repeated here.

Although in FIG. 5 , the indication mark layer 105, the high dielectric ink layer 106, and the high dielectric adhesive layer 107 are sequentially stacked between the cover plate 101 and the fingerprint identification module 102, but this does not constitute a limitation to it. Technicians can select at least one layer of them according to needs. For example, only the high-dielectric adhesive layer 107 is included between the cover plate 101 and the fingerprint recognition module 102, or the reminder mark layer 105 and the high-dielectric adhesive layer 107 stacked in sequence (the prompt mark layer 105 is close to the cover plate 101, the high-dielectric adhesive layer 107 is close to the fingerprint recognition module 102), or includes a sequentially stacked high-dielectric ink layer 106 and a high-dielectric adhesive layer 107 (the high-dielectric ink layer 106 is close to the cover plate 101, The high dielectric adhesive layer 107 is close to the fingerprint identification module 102) and so on.

The embodiment of the present invention focuses on other components such as a prompt mark layer, a high-dielectric ink layer, and a high-dielectric adhesive layer. Therefore, the blind hole 1013 included in the cover part corresponding to the fingerprint recognition module 102 in FIG. 5 is only an example. Of course, there may be no blind holes, and those skilled in the art can understand that this does not constitute a limitation thereto.

This embodiment of the present invention is an optimization of Embodiment 1 and Embodiment 2. Therefore, in addition to the advantages of Embodiment 1 and Embodiment 2, it also has the following further advantages: because between the cover plate 101 and the fingerprint identification module 102 If there is at least one layer of the prompt marking layer, the high dielectric ink layer, and the high dielectric adhesive layer, then the prompt marking layer can better prompt the user to identify the position of the fingerprint, and the high dielectric ink layer can improve the fingerprint identification. The high-dielectric adhesive layer can improve the sensitivity of fingerprint identification while bonding the fingerprint identification module 102 under the cover plate 101 .

Other variants:

Although the cover described in Embodiments 1 to 3 is located on the front of the mobile phone, it is obvious that the cover can also be located on the back of the mobile phone, and correspondingly, the fingerprint identification module can also be arranged under the cover on the back. As for the blind hole on the cover plate, at least one layer of prompt marking layer, high dielectric ink layer, high dielectric adhesive layer, etc. is arranged between the cover plate and the fingerprint recognition module, and details will not be repeated here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (11)

1. A terminal device, characterized in that it comprises a cover plate, a fingerprint identification module and a control unit; The cover plate is located on one side of the terminal device; The fingerprint identification module is arranged under the cover plate and is electrically connected to the control unit for identifying the fingerprint implemented on the cover plate corresponding to the fingerprint identification module; The control unit is configured to perform authentication processing according to the fingerprint identified by the fingerprint identification module; Wherein, the cover plate is made of a material with a dielectric constant of a first preset value, and the panel corresponds to a part of the fingerprint identification module, and its thickness is a preset value. 2. The terminal device according to claim 1, wherein the terminal device further comprises a display panel; the display panel is arranged under the first area of the cover, and correspondingly, the fingerprint identification module It is arranged at a set position under the second area of the cover plate. 3. The terminal device according to claim 1 or 2, wherein the part of the cover plate corresponding to the fingerprint recognition module is provided with a blind hole, and the opening of the blind hole faces away from the fingerprint recognition module side. 4. The terminal device according to claim 1 or 2, wherein the cover plate corresponds to the part of the fingerprint identification module, and the difference between its thickness and the thickness of other parts of the cover plate is less than a preset value . 5. The terminal device according to any one of claims 1-4, wherein the cover plate is made of transparent glass. 6 . The terminal device according to claim 5 , wherein a prompt identification layer is included between the cover plate and the fingerprint recognition module. 6 . 7. The terminal device according to claim 5, wherein an ink layer having a dielectric constant of a second preset value is included between the cover plate and the fingerprint recognition module. 8. The terminal device according to claim 6, further comprising an ink layer having a dielectric constant of a second preset value, the ink layer being located between the prompt identification layer and the fingerprint recognition module . 9. The terminal device according to any one of claims 2-8, characterized in that, the fingerprint recognition module is attached to the underside of the cover with an adhesive having a dielectric constant of a third preset value. the set position. 10. The terminal device according to any one of claims 1-9, wherein the terminal device further comprises a printed circuit board, and the fingerprint identification module is electrically connected to the control unit through the printed circuit board . 11. The terminal device according to claim 1, wherein the terminal device further comprises a display panel; and the cover plate is located on the opposite side of the display panel.