Hidden fingerprint identification display screen and display device

Abstract

The utility model relates to the technical field of fingerprint display screens, and discloses a hidden fingerprint identification display screen and a display device. The cover plate is provided with a blind hole, and the length of the blind hole is smaller than the thickness of the cover plate. The fingerprint module is arranged in the blind hole and used for identifying fingerprint information, and the thickness of the fingerprint module is smaller than the length of the blind hole; and the electrochromic film is arranged in the blind hole and between the cover plate and the fingerprint module, the electrochromic film is electrically connected with the fingerprint module, the color of the electrochromic film can be switched between a transparent state and a non-transparent state, and the electrochromic film is used for displaying the fingerprint module in the transparent state and hiding fingerprints in the non-transparent state. The blind hole is formed in the cover plate, so that the fingerprint module can be embedded in the cover plate, and meanwhile, the thickness of the cover plate, in contact with the outside, of the fingerprint module is reduced, so that fingerprint identification is more accurate. And the electrochromic film effectively realizes fingerprint hiding by changing the transparent state.

Description

Technical Field

[0001] This utility model relates to the technical field of fingerprint display screens, and in particular to a hidden fingerprint recognition display screen and display device. Background Technology

[0002] With the rapid development of electronic devices, fingerprint recognition technology is being used more and more widely in devices such as smartphones and tablets. However, existing fingerprint recognition systems typically cover the fingerprint module with a screen cover.

[0003] Because the fingerprint module has a certain thickness, the display cover may not be flat when it is covered, and the fingerprint recognition may be inaccurate due to the large thickness of the display cover. Utility Model Content

[0004] In order to solve the problems existing in the prior art, this utility model provides a hidden fingerprint recognition display screen and display device.

[0005] On one hand, the hidden fingerprint recognition display screen provided by this utility model adopts the following technical solution: a cover plate with blind holes, the length of which is less than the thickness of the cover plate; a fingerprint module disposed in the blind holes for recognizing fingerprint information, the thickness of which is less than the length of the blind holes; an electrochromic film disposed in the blind holes and between the cover plate and the fingerprint module, the electrochromic film being electrically connected to the fingerprint module, the color of which can be switched between a transparent state and an opaque state, the electrochromic film being used to display the fingerprint module in a transparent state and to hide the fingerprint module in an opaque state.

[0006] Optionally, the identification display screen further includes: a pressure sensor disposed on the electrochromic film, used to receive pressure signals, generate voltage signals, and switch the transparent and opaque states of the electrochromic film.

[0007] Optionally, the recognition display screen further includes: a transparent optical adhesive with conductive properties, disposed between the electrochromic film and the fingerprint module, connecting and fixing the electrochromic film and the fingerprint module.

[0008] Optionally, the recognition display screen further includes: a flexible circuit board disposed outside the blind hole and in contact with the cover plate; the flexible circuit board is electrically connected to the fingerprint module and is used to receive the fingerprint information and transmit it to the processor.

[0009] Optionally, the recognition display screen further includes: a connecting adhesive disposed between the fingerprint module and the flexible circuit board for fixing the fingerprint module and the flexible circuit board.

[0010] Optionally, the identification display screen further comprises: an ink layer, which is screen-printed on the cover plate and arranged between the flexible circuit board and the cover plate.

[0011] Optionally, the sum of the thicknesses of the electrochromic film, the transparent optical adhesive, the fingerprint module and the connecting adhesive is a first thickness, and the sum of the length of the blind hole and the thickness of the ink layer is a second thickness, the first thickness being equal to the second thickness.

[0012] Optionally, the fingerprint module comprises: a semiconductor chip for optically identifying a fingerprint to form fingerprint information; and a circuit connecting plate for integrating the semiconductor chip and receiving the fingerprint information to be transmitted to the flexible circuit board.

[0013] Optionally, the connecting adhesive is a liquid adhesive when not bonded.

[0014] In another aspect, the utility model provides a kind of display device, including the one kind hidden fingerprint identification display screen of the utility model.

[0015] The above any technical solution of the utility model has at least one of the following beneficial effects:

[0016] 1. Blind holes are formed in the cover plate, so that the fingerprint module can be embedded in the cover plate, and the thickness of the cover plate in contact with the outside is reduced, so that the fingerprint identification is more accurate. The electrochromic film effectively realizes the hiding of the fingerprint by changing the transparent state.

[0017] 2. The flexible circuit board and the fingerprint module are fixed together by the connecting adhesive. The relative position between the flexible circuit board and the fingerprint module is effectively kept unchanged, the circuit is not easily disconnected, and the service life is prolonged.

[0018] 3. The connecting adhesive is a liquid adhesive, which can be added based on the size of the gap during filling the gap of the blind hole, effectively avoiding the condition that the gap in the blind hole is not filled. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the utility model one kind hidden fingerprint identification display screen;

[0020] Figure 2 is a structural schematic view of the cover plate in the utility model one kind hidden fingerprint identification display screen;

[0021] Figure 3 is a position view of the fingerprint module in the utility model one kind hidden fingerprint identification display screen.

[0022] The reference signs are explained as follows: 1, cover plate; 2, blind hole; 3, fingerprint module; 31, semiconductor chip; 32, circuit connecting plate; 4, electrochromic film; 5, transparent optical adhesive; 6, flexible circuit board; 7, connecting adhesive; 8, ink layer. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0024] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0025] Embodiment 1

[0026] The embodiments of the present application disclose a hidden fingerprint recognition display screen. Referring to Figure 1 and Figure 2 , comprising: a cover plate 1, a blind hole 2 is opened, the length of the blind hole 2 is lower than the thickness of the cover plate 1; a fingerprint module 3 is arranged in the blind hole 2, used for identifying fingerprint information, the thickness of the fingerprint module 3 is lower than the length of the blind hole 2; an electrochromic film 4 is arranged in the blind hole 2 and between the cover plate 1 and the fingerprint module 3, the electrochromic film 4 is electrically connected with the fingerprint module 3, the color of the electrochromic film 4 is switchable between a transparent state and a non-transparent state, the electrochromic film 4 is used for displaying the fingerprint module 3 in the transparent state and hiding the fingerprint module 3 in the non-transparent state.

[0027] Based on the above structure, the blind hole 2 is opened on the cover plate 1, so that the fingerprint module 3 can be embedded in the cover plate 1, at the same time, the thickness of the cover plate 1 in contact with the outside world is reduced, so that the fingerprint recognition is more accurate. The electrochromic film 4 effectively realizes the hiding of the fingerprint by changing the transparent state.

[0028] Optionally, when the display device is a mobile phone, the cover plate 1 is a mobile phone display screen, the fingerprint module 3 should be in the middle and lower part of the cover plate 1, close to the lower edge line, based on the position of the fingerprint module 3, the blind hole 2 is opened on the cover plate 1, effectively realizing that the position of the blind hole 2 corresponds to the position of the fingerprint module 3, avoiding deviation.

[0029] Optionally, the thickness of the fingerprint module 3 needs to be less than the length of the blind hole 2, so that the fingerprint module 3 can be placed entirely in the blind hole 2, effectively avoiding the fingerprint module 3 protruding when the cover plate 1 is attached, which would cause the cover plate 1 to be unevenly attached.

[0030] In this preferred embodiment, the identification display screen further includes a pressure sensor disposed on the electrochromic film 4, used to receive pressure signals, generate voltage signals, and switch the transparent and opaque states of the electrochromic film 4.

[0031] Based on the above structure, the pressure sensor has multiple tiny sensing points. When the pressure sensor is placed on the electrochromic film 4, the sensing points in the pressure sensor need to be evenly distributed on the electrochromic film 4. When a fingerprint is pressed, the pressure sensor will receive the pressure signal and convert it into a voltage signal. When the voltage changes, the electrochromic film 4 will change from an opaque state to a transparent state. At this time, the fingerprint module 3 can start working.

[0032] Optionally, in the opaque state, the electrochromic film 4 can be set to a color as needed. For example, if the display device is black when it is not displaying content, the electrochromic film 4 can be set to black so that the entire display device has the same color.

[0033] Meanwhile, the electrochromic film 4 is electrically connected to the fingerprint module 3. The fingerprint module 3 only starts working when the electrochromic film 4 becomes transparent, which effectively reduces the power consumption of the fingerprint module 3.

[0034] In this preferred embodiment, the recognition display screen further includes: a transparent optical adhesive 5, which has conductive properties, disposed between the electrochromic film 4 and the fingerprint module 3, and connecting and fixing the electrochromic film 4 and the fingerprint module 3.

[0035] Reference Figure 3 Based on the above structure, a transparent optical adhesive 5 with conductive properties is provided, so that when the electrochromic film 4 becomes transparent, the voltage signal can be transmitted to the fingerprint module 3 at the same time, and the fingerprint module 3 starts to work at the same time.

[0036] Optionally, the transparent optical adhesive 5 not only has adhesive properties, but also transparent optical properties. That is, when it is placed above the fingerprint module 3, it does not affect the optical recognition of the fingerprint module 3 on the fingerprint pattern, effectively ensuring that the fingerprint module 3 can work normally.

[0037] The transparent optical glue 5 is selected from OCA optical glue. The OCA optical glue has the characteristics of colorless and transparent, so that it does not introduce any color deviation when bonding transparent optical elements. The light transmittance of the OCA optical glue is as high as 90% or more, thereby ensuring the light transmittance and clarity of the optical element. The OCA optical glue has excellent bonding strength and can firmly bond various transparent optical elements, thereby ensuring the stability and reliability of the optical device. Meanwhile, the OCA optical glue can be cured at room temperature or in a medium-temperature environment, and has a very small curing shrinkage.

[0038] Preferably, the identification display screen further comprises a flexible circuit board 6 arranged outside the blind hole 2 and in contact with the cover plate 1, the flexible circuit board 6 being electrically connected to the fingerprint module 3 and used for receiving fingerprint information and transmitting the fingerprint information to the processor.

[0039] Based on the above structure, the flexible circuit board 6 is a larger flexible board, which has a plurality of copper wires inside to effectively connect electronic components to each other. The internal wiring is complex, and the fingerprint module 3 can be connected to the processor. However, the flexible circuit board 6 is not only connected to the fingerprint module 3, but also connected to other electronic components, so it needs to be arranged outside the blind hole 2 to facilitate connection with other displayed electronic components.

[0040] Preferably, the identification display screen further comprises a connecting glue 7 arranged between the fingerprint module 3 and the flexible circuit board 6 and used for fixing the fingerprint module 3 and the flexible circuit board 6.

[0041] Based on the above structure, the fingerprint module 3 is arranged in the blind hole 2, and the flexible circuit board 6 is arranged outside the blind hole 2. In order to avoid instability between the two, position changes, and disconnection of the connected lines, the flexible circuit board 6 and the fingerprint module 3 need to be fixed together by the connecting glue 7. This effectively ensures that the position between the flexible circuit board 6 and the fingerprint module 3 is relatively constant, the line is not easy to disconnect, and the service life is prolonged.

[0042] Preferably, the identification display screen further comprises an ink layer 8 printed on the cover plate 1 and arranged between the flexible circuit board 6 and the cover plate 1.

[0043] Based on the above structure, the ink layer 8 is arranged on the cover plate 1 by silk-screen printing. The ink layer 8 can effectively cover the lines of the flexible circuit board, so that the appearance of the display device cannot see the internal line layout, thereby making the appearance neat and beautiful.

[0044] Preferably, the sum of the thicknesses of the electrochromic film 4, the transparent optical glue 5, the fingerprint module 3, and the connecting glue 7 is a first thickness, the sum of the length of the blind hole 2 and the thickness of the ink layer 8 is a second thickness, and the first thickness is equal to the second thickness.

[0045] Based on the above structure, when the fingerprint module 3 is shaken or rubbed, the internal components of the fingerprint module 3 can be damaged, so that the fingerprint module 3 cannot normally identify the fingerprint. In order to ensure that the fingerprint module 3 is arranged in the blind hole 2 and is not easy to shake, the inside of the blind hole 2 needs to be filled, so that there is no space gap in the blind hole 2.

[0046] Optionally, the electrochromic film 4, the transparent optical adhesive 5 and the fingerprint module 3 are placed in the blind hole 2, the connecting adhesive 7 is filled, the connecting adhesive 7 is filled to be flush with the ink layer 8, and then the flexible circuit board 6 is covered, so that the flexible circuit board 6 is tightly attached to the ink layer 8. At this time, there is no gap in the blind hole 2 for the fingerprint module 3 to shake, and the service life of the fingerprint module 3 is effectively improved.

[0047] Preferably, the fingerprint module 3 includes: a semiconductor chip 31 for optically identifying a fingerprint to form fingerprint information; and a circuit connection plate 32 for integrating the semiconductor chip 31 and receiving the fingerprint information to be transmitted to the flexible circuit board 6.

[0048] Based on the above structure, the optical identification component in the semiconductor chip 31 (Die) optically identifies the fingerprint pattern to form the fingerprint information. The circuit connection plate 32 (PCB) integrates the semiconductor chip 31 into a complete module to form the fingerprint module 3.

[0049] Preferably, the connecting adhesive 7 is a liquid adhesive when not adhered.

[0050] Based on the above structure, the connecting adhesive 7 is a liquid adhesive, and the amount of the connecting adhesive 7 can be added based on the size of the gap during the filling of the gap of the blind hole 2, so that the condition that the gap in the blind hole 2 is not filled is effectively avoided.

[0051] Embodiment 2

[0052] The display device provided by the utility model discloses a kind of hidden fingerprint identification display screen.

[0053] The implementation principle of the hidden fingerprint identification display screen and the display device in the utility model embodiment is as follows:

[0054] The fingerprint module 3 is used to collect the fingerprint information of the user and identify and process it. The electrochromic film 4 is covered above the fingerprint module 3, and its color and transparency can be adjusted by the voltage signal formed by pressure. When the display device is in standby or does not use the fingerprint identification function, the electrochromic film 4 is in an opaque state, or can be in the same color state as the ink layer 8 on the cover plate 1, so that the fingerprint module 3 can be hidden, and the surface of the device can be made beautiful.

[0055] When the user needs to perform fingerprint identification, the device system controls the voltage to be applied so that the electrochromic film 4 becomes transparent, allowing the fingerprint module 3 to work normally.

[0056] The blind hole 2 is arranged on the cover plate 1, and the electrochromic film 4 and the fingerprint module 3 are arranged in the blind hole 2, so that the integration design of the fingerprint module 3 and the cover plate 1 is realized, and the integrity and flatness of the display device are improved. At the same time, the hidden design effectively protects the fingerprint module 3, reduces the wear and tear of the fingerprint module 3 by other components in the display device and the influence of external factors, and improves the service life and stability.

[0057] In addition, through the control of the electrochromic film 4, the on-demand use of the fingerprint recognition function is realized, and the energy consumption of the display device is reduced.

[0058] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A hidden fingerprint recognition display screen, characterized in that, include: A cover plate (1) has a blind hole (2) with a length less than the thickness of the cover plate (1). A fingerprint module (3) is disposed in the blind hole (2) for recognizing fingerprint information. The thickness of the fingerprint module (3) is less than the length of the blind hole (2). An electrochromic film (4) is disposed in the blind hole (2) and between the cover plate (1) and the fingerprint module (3). The electrochromic film (4) is electrically connected to the fingerprint module (3). The color of the electrochromic film (4) can be switched between a transparent state and an opaque state. The electrochromic film (4) is used to display the fingerprint module (3) in a transparent state and to hide the fingerprint module (3) in an opaque state.

2. The hidden fingerprint recognition display screen according to claim 1, characterized in that, Also includes: A pressure sensor is disposed on the electrochromic film (4) to receive pressure signals, generate voltage signals, and switch the transparent and opaque states of the electrochromic film (4).

3. The hidden fingerprint recognition display screen according to claim 1, characterized in that, Also includes: A transparent optical adhesive (5), which has conductive properties, is disposed between the electrochromic film (4) and the fingerprint module (3) to connect and fix the electrochromic film (4) and the fingerprint module (3).

4. A hidden fingerprint recognition display screen according to claim 1, characterized in that, Also includes: A flexible circuit board (6) is disposed outside the blind hole (2) and is in contact with the cover plate (1). The flexible circuit board (6) is electrically connected to the fingerprint module (3) and is used to receive the fingerprint information and transmit it to the processor.

5. A hidden fingerprint recognition display screen according to claim 4, characterized in that, Also includes: Connecting adhesive (7) is disposed between the fingerprint module (3) and the flexible circuit board (6) to fix the fingerprint module (3) and the flexible circuit board (6).

6. A hidden fingerprint recognition display screen according to claim 4, characterized in that, Also includes: An ink layer (8) is screen-printed on the cover plate (1) and disposed between the flexible circuit board (6) and the cover plate (1).

7. A hidden fingerprint recognition display screen according to claim 5, characterized in that, The sum of the thicknesses of the electrochromic film (4), the transparent optical adhesive (5), the fingerprint module (3), and the connecting adhesive (7) is the first thickness, and the sum of the length of the blind hole (2) and the thickness of the ink layer (8) is the second thickness. The first thickness and the second thickness are equal.

8. A hidden fingerprint recognition display screen according to claim 4, characterized in that, The fingerprint module (3) includes: A semiconductor chip (31) is used for optical fingerprint recognition to form fingerprint information; The circuit connection board (32) is used to integrate the semiconductor chip (31) and receive the fingerprint information transmitted to the flexible circuit board (6).

9. A hidden fingerprint recognition display screen according to claim 5, characterized in that, The adhesive (7) is a liquid adhesive when it is not bonded.

10. A display device, characterized in that, Including a hidden fingerprint recognition display screen as described in any one of claims 1-9.

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