Display device

Abstract

This application provides a display device, relating to the field of display technology, to solve the technical problem of inconsistent display effects between fingerprint recognition areas and non-fingerprint recognition areas in display devices. The display device includes a screen and a fingerprint recognition sensor. A shielding layer with through holes is disposed on the backlight side of the screen. The fingerprint recognition sensor includes a driving unit and a photosensitive unit. A first surface of the photosensitive unit is a photosensitive surface, and a second surface is a light-absorbing surface. The first and second surfaces are arranged opposite to each other, and at least a portion of the projection of the photosensitive unit onto the shielding layer covers the through holes. When the fingerprint recognition sensor performs fingerprint recognition, the photosensitive surface faces the screen. When the fingerprint recognition sensor does not perform fingerprint recognition, the driving unit drives the photosensitive unit to rotate, and the light-absorbing surface faces the screen. The display device provided in this application is used for display and fingerprint recognition.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display device. Background Technology

[0002] Organic light-emitting display (OLED) panels have many advantages, such as self-illumination, fast response, wide viewing angle, and the ability to be fabricated on flexible substrates, and are increasingly being used in high-performance display devices.

[0003] To improve display device performance, fingerprint sensors are typically placed on the back of the screen, creating a display device with under-display fingerprint recognition. However, existing display devices with under-display fingerprint recognition still suffer from inconsistent screen brightness between the fingerprint recognition area and the non-fingerprint recognition area, affecting the uniformity of the display effect. Summary of the Invention

[0004] In view of the above problems, this application provides a display device that can make the screen brightness of the fingerprint recognition area and the non-fingerprint recognition area more consistent, thereby improving the consistency of the display effect.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] This application provides a display device including a screen and a fingerprint recognition sensor. A shielding layer with a through-hole is provided on the backlight side of the screen. The fingerprint recognition sensor includes a driving unit and a photosensitive unit. A first surface of the photosensitive unit is a photosensitive surface, and a second surface is a light-absorbing surface. The first and second surfaces are disposed opposite to each other, and at least a portion of the photosensitive unit's orthogonal projection onto the shielding layer covers the through-hole. When the fingerprint recognition sensor performs fingerprint recognition, the photosensitive surface faces the screen. When the fingerprint recognition sensor does not perform fingerprint recognition, the driving unit drives the photosensitive unit to rotate so that the light-absorbing surface faces the screen.

[0007] In one possible implementation, the fingerprint sensor further includes a frame fixed to the shielding layer; the photosensitive unit includes a carrier plate, which is rotatably connected to the frame via a pivot; a first surface of the carrier plate is provided with a photosensitive element, and a second surface of the carrier plate is provided with a black electrode covering it.

[0008] In one possible implementation, the driving unit further includes a first driving electrode and a second driving electrode with different electrical polarities; the distances between the first driving electrode, the second driving electrode, and the rotating shaft are all smaller than the rotation radius of the carrier plate, and a rotation space for the carrier plate is formed between the first driving electrode and the second driving electrode; when the first driving electrode and the black electrode have different electrical polarities, the first end of the carrier plate is attracted to the first driving electrode, so that the photosensitive surface faces the screen; when the second driving electrode and the black electrode have different electrical polarities, the carrier plate rotates and the second end of the carrier plate is attracted to the second driving electrode, so that the black electrode faces the screen.

[0009] In one possible implementation, along the rotation direction of the carrier plate, both the first driving electrode and the second driving electrode are disposed on the same side of the carrier plate, and the second driving electrode is disposed further away from the carrier plate than the first driving electrode; the first driving electrode is configured to abut against the first end of the carrier plate when the fingerprint recognition sensor performs fingerprint recognition; the second driving electrode is configured to abut against the second end of the carrier plate when the fingerprint recognition sensor does not perform fingerprint recognition.

[0010] In one possible implementation, along the rotation direction of the carrier plate, the first driving electrode and the second driving electrode are respectively disposed on both sides of the carrier plate; the first driving electrode is configured to abut against the first end of the carrier plate when the fingerprint recognition sensor performs fingerprint recognition; the second driving electrode is configured to abut against the first end of the carrier plate when the fingerprint recognition sensor does not perform fingerprint recognition.

[0011] In one possible implementation, the driving unit further includes a first limiting block, which is symmetrically arranged with respect to the first driving electrode about the rotation axis; and / or, the driving unit further includes a second limiting block, which is symmetrically arranged with respect to the second driving electrode about the rotation axis.

[0012] In one possible implementation, the first limiting block is an electrode with the same electrical properties as the first driving electrode; the second limiting block is an electrode with the same electrical properties as the second driving electrode; preferably, the first driving electrode, the second driving electrode, the first limiting block, and the second limiting block are all transparent electrodes.

[0013] In one possible implementation, the fingerprint sensor includes a plurality of photosensitive units; the plurality of photosensitive units are arranged in an array within the frame, and the plurality of photosensitive units located in the same row or column rotate synchronously.

[0014] In one possible implementation, multiple photosensitive units located in the same row or column are mounted on the same rotating shaft.

[0015] In one possible implementation, the fingerprint sensor is disposed within the through hole; or the fingerprint sensor is disposed on the side of the shielding layer opposite to the screen body and opposite to the through hole.

[0016] Compared with related technologies, the display device provided in this application has the following advantages;

[0017] The display device provided in this application includes a screen and a fingerprint recognition sensor disposed on the backlight side of the screen. The backlight side of the screen has a shielding layer, and the shielding layer is provided with a through hole that cooperates with the fingerprint recognition sensor. The fingerprint recognition sensor includes a driving unit and a photosensitive unit. The photosensitive unit includes a photosensitive surface and a light-absorbing surface opposite to the photosensitive surface. Under the action of the driving unit, the photosensitive unit can rotate relative to the shielding layer so that the photosensitive surface or the light-absorbing surface faces the screen and can block the through hole.

[0018] When the fingerprint sensor performs fingerprint recognition, the photosensitive surface faces the screen and receives the light beam carrying fingerprint information, thus enabling fingerprint recognition. Conversely, when the fingerprint sensor is not in operation, the driving unit drives the photosensitive unit to rotate so that the light-absorbing surface faces the screen, absorbing the light emitted from the screen onto the shielding layer. This configuration reduces the amount of light reflected from the photosensitive surface to the channels of the array substrate, and also reduces the time the array substrate is exposed to light, thereby reducing or avoiding channel characteristic shifts. This makes the screen brightness in the fingerprint recognition area and non-fingerprint recognition area more consistent, improving the consistency of the display effect.

[0019] In addition to the technical problems solved by the embodiments of this disclosure, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that the display device provided by the embodiments of this disclosure can solve, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 Schematic diagram of the structure of the display device provided in the embodiments of this application Figure 1 ;

[0022] Figure 2 Schematic diagram of the structure of the display device provided in the embodiments of this application Figure 2 ;

[0023] Figure 3 Schematic diagram of the working state of the photosensitive unit provided in the embodiments of this application Figure 1 ;

[0024] Figure 4 This is a schematic diagram of the off state of the photosensitive unit provided in the embodiments of this application. Figure 1 ;

[0025] Figure 5 Schematic diagram of the working state of the photosensitive unit provided in the embodiments of this application Figure 2 ;

[0026] Figure 6 This is a schematic diagram of the off state of the photosensitive unit provided in the embodiments of this application. Figure 2 ;

[0027] Figure 7 Schematic diagram of the working state of the photosensitive unit provided in the embodiments of this application Figure 3 ;

[0028] Figure 8 This is a schematic diagram of the off state of the photosensitive unit provided in the embodiments of this application. Figure 3 ;

[0029] Figure 9 Schematic diagram of the working state of the photosensitive unit provided in the embodiments of this application Figure 4 ;

[0030] Figure 10 This is a schematic diagram of the off state of the photosensitive unit provided in the embodiments of this application. Figure 4 ;

[0031] Figure 11 This is a schematic diagram of the arrangement of multiple photosensitive units in the fingerprint recognition sensor provided in the embodiments of this application;

[0032] Figure 12 A schematic diagram showing the state of multiple photosensitive units when the fingerprint recognition sensor provided in this application is in working condition;

[0033] Figure 13 This is a schematic diagram showing the state of multiple photosensitive units when the fingerprint recognition sensor provided in this application is in the off state.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10-Screen body;

[0036] 11-Array substrate; 12-Light-emitting layer;

[0037] 20 - Shielding layer;

[0038] 21-Through hole;

[0039] 30 - Fingerprint recognition sensor;

[0040] 31-Frame; 32-Hinge; 33-Photosensitive unit;

[0041] 331-Carrier plate; 332-Photosensitive surface; 333-Black electrode; 334-First driving electrode; 335-Second driving electrode; 336-First limiting block; 337-Second limiting block;

[0042] 100 - Display device. Detailed Implementation

[0043] As described in the background section, display devices in the related art have under-display fingerprint recognition functionality, typically with a fingerprint sensor located on the backlight side of the screen; however, these display devices suffer from inconsistent display effects between the fingerprint recognition area and the non-fingerprint recognition area. The applicant's research has revealed that the reason for this problem is:

[0044] Typically, a shielding layer with through-holes is provided on the back side of the screen, and the aforementioned fingerprint recognition sensor is disposed within these through-holes. Since some light emitted from the screen can illuminate the back side of the screen, some light directed towards the backlight side can illuminate the fingerprint recognition sensor and be reflected by it into the channels of the array substrate. However, when the channels of the array substrate are exposed to this light for an extended period, it affects the carrier mobility of the channels, causing a shift in channel characteristics. This results in differences in screen brightness between the fingerprint recognition area and the non-fingerprint recognition area, affecting the consistency of the display effect.

[0045] To address the aforementioned technical problems, this application provides a display device in which a fingerprint recognition sensor includes a driving unit and a photosensitive unit. The photosensitive unit includes a photosensitive surface and a light-absorbing surface opposite to the photosensitive surface. Under the action of the driving unit, the photosensitive unit can rotate relative to the shielding layer so that the photosensitive surface or the light-absorbing surface faces the screen body and blocks the through hole.

[0046] When the fingerprint sensor is active, its photosensitive surface faces the screen and receives a beam of light carrying fingerprint information, enabling fingerprint recognition. Conversely, when the fingerprint sensor is inactive, the driving unit rotates the photosensitive unit so that its light-absorbing surface faces the screen, absorbing light emitted from the screen onto the shielding layer. This configuration reduces the amount of light reflected from the photosensitive surface to the channels of the array substrate, and also reduces the time the array substrate is exposed to light, thereby reducing or preventing channel characteristic shifts. This makes the screen brightness more consistent between the fingerprint recognition area and the non-fingerprint recognition area, improving the consistency of the display effect.

[0047] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0048] like Figure 1 As shown, the display device 100 provided in this application embodiment includes a screen 10 and a shielding layer 20. The screen 10 may be an OLED display screen. The screen 10 includes an array substrate 11 and a light-emitting layer 12. The shielding layer 20 is disposed on the backlight side of the screen 10. The shielding layer 20 may be formed by black foam disposed on the backlight side of the screen 10. The black foam can absorb light.

[0049] The light-emitting layer 12 is disposed on the side of the array substrate 11 away from the shielding layer 20, that is, the light-emitting layer 12 is located on the light-emitting side of the screen 10, and the light-emitting layer 12 and the shielding layer 20 are disposed opposite each other on both sides of the array substrate 11. The light-emitting layer 12 includes multiple light-emitting units. Among the light emitted by the light-emitting units, some light can be emitted from the light-emitting side of the screen 10; some light can illuminate the backlight side and be absorbed by the shielding layer 20.

[0050] To achieve under-display fingerprint recognition, the display device 100 provided in this application embodiment further includes a fingerprint recognition sensor 30, which is disposed on the backlight side of the screen 10. Correspondingly, the shielding layer 20 is provided with a through hole 21 that cooperates with the fingerprint recognition sensor 30, so as to ensure that light carrying fingerprint information can be irradiated to the fingerprint recognition sensor 30 through the through hole 21, thereby realizing the fingerprint recognition function.

[0051] Further, see Figure 11The fingerprint recognition sensor 30 includes at least one photosensitive unit 33, and at least a portion of the photosensitive unit 33 is projected onto the shielding layer 20 to cover the through hole 21. The photosensitive unit 33 includes a first surface and a second surface disposed opposite to each other. The first surface is a photosensitive surface for receiving light carrying fingerprint information. Light from the screen 10 that passes through the through hole 21 and is directed toward the shielding layer 20 can be reflected onto the array substrate 11 by the photosensitive surface 332. The second surface is a light-absorbing surface that can absorb light that is irradiated into the through hole 21, preventing light passing through the through hole 21 from being reflected onto the array substrate 11.

[0052] For example, such as Figure 2 As shown, the fingerprint sensor 30 can be disposed within the through-hole 21 to reduce the overall thickness of the display device 100; see further. Figure 1 In some embodiments, the fingerprint recognition sensor 30 may also be disposed on the side of the shielding layer 20 away from the array substrate 11 and opposite to the through hole 21. This embodiment does not limit this, but preferably the fingerprint recognition sensor 30 is disposed in the through hole 21. This embodiment will also be described with the fingerprint recognition sensor 30 disposed in the through hole 21 as an example.

[0053] like Figure 3 and Figure 4 As shown, the fingerprint recognition sensor 30 provided in this application embodiment also includes a driving unit. The driving unit is used to drive the photosensitive unit 33 so that the photosensitive unit 33 rotates in the through hole 21 so that when the fingerprint recognition sensor 30 performs fingerprint recognition, the photosensitive surface of the photosensitive unit 33 can face the screen body, and conversely, when the fingerprint recognition sensor 30 does not perform fingerprint recognition, the light-absorbing surface of the photosensitive unit 33 can face the screen body.

[0054] Specifically, the photosensitive unit 33 includes a carrier plate 331 and a black electrode 333. The carrier plate 331 includes a first surface and a second surface arranged opposite to each other. The first surface is a photosensitive surface 332. For example, the first surface is provided with a plurality of photosensitive elements, and the plurality of photosensitive elements cover the entire first surface to form a photosensitive surface. The second surface is covered by the black electrode 333, that is, the black electrode 333 can cover the entire second surface to form a light-absorbing surface.

[0055] In this embodiment, the driving unit can drive the carrier plate 331 to rotate, so that the carrier plate 331 rotates within the through hole 21. The driving unit drives the carrier plate 331 to rotate according to the working state of the fingerprint recognition sensor 30, so that the photosensitive surface 332 of the fingerprint recognition sensor 30 faces the screen 10 or faces away from the screen 10; in other words, according to the working state of the fingerprint recognition sensor 30, the driving unit drives the carrier plate 331 to rotate, so that the black electrode 333 (light-absorbing surface) faces the screen 10 or faces away from the screen 10.

[0056] For example, when the fingerprint recognition sensor 30 is in working state (when the operator's finger touches the fingerprint recognition area of ​​the screen 10, i.e. when the fingerprint recognition sensor 30 performs fingerprint recognition), the driving unit drives the carrier plate 331 to rotate so that the photosensitive surface 332 of the fingerprint recognition sensor 30 faces the screen 10 and can receive light carrying fingerprint information, thereby realizing the fingerprint recognition function.

[0057] Conversely, when the fingerprint sensor 30 is not in operation (the operator's finger leaves the fingerprint recognition area of ​​the screen 10, or after the fingerprint sensor 30 has been in operation for a preset time, i.e., when the fingerprint sensor 30 is not performing fingerprint recognition), the driving unit drives the carrier plate 331 to rotate so that the black electrode 333 (light-absorbing surface) of the fingerprint sensor 30 faces the screen 10 to absorb the light irradiated by the screen 10 into the through hole 21.

[0058] In this embodiment, when the fingerprint sensor 30 is not performing fingerprint recognition, the black electrode 333 (light-absorbing surface) can face the screen 10. This reduces the amount of light reflected from the photosensitive surface 332 to the channel of the array substrate 11, and also reduces the time the array substrate 11 is illuminated. This reduces or avoids characteristic shifts caused by prolonged illumination of the channel, making the brightness of the screen 10 in the fingerprint recognition area and the non-fingerprint recognition area more consistent, thus improving the consistency of the display effect. Simultaneously, it eliminates the possibility of observing the fingerprint sensor 30 in the fingerprint recognition area under specific conditions during non-fingerprint recognition, further improving the display effect.

[0059] Continue reading Figure 3 , Figure 4 and Figure 11 Based on the above embodiments, the carrier plate 331 in this application embodiment rotates under the action of the driving unit; specifically, the fingerprint recognition sensor 30 also includes a frame 31 and a rotating shaft 32, wherein the frame 31 can be disposed in the through hole 21, and the carrier plate 331 can be rotatably connected to the frame 31 through the rotating shaft 32, that is, the carrier plate 331 rotates around the rotating shaft 32 and forms the rotation axis of the carrier plate 331.

[0060] For example, the carrier plate 331 can be a rectangular plate. A rotating shaft 32 can be provided on each of the two opposite side walls of the carrier plate 331. One end of the rotating shaft 32 is fixedly connected to the carrier plate 331, and the other end of the rotating shaft 32 can be rotatably connected to the frame 31. When the driving unit provides rotational power to the carrier plate 331, the carrier plate 331 can rotate relative to the frame 31. When the rotation stops, the carrier plate 331 can block the through hole 21.

[0061] Furthermore, the driving unit provided in this embodiment includes a first driving electrode 334 and a second driving electrode 335, wherein the first driving electrode 334 and the second driving electrode 335 have opposite electrical properties and are configured in conjunction with the aforementioned black electrode 333. For example, when the black electrode 333 has an opposite electrical property to the first driving electrode 334 or the second driving electrode 335, the carrier plate 331 can be adsorbed onto the first driving electrode 334 or the second driving electrode 335.

[0062] The first driving electrode 334 and the second driving electrode 335 can be disposed in the through hole 21. The distance between the first driving electrode 334 and the rotation axis of the carrier plate 331 is less than the rotation radius of the carrier plate 331. In other words, when the first driving electrode 334 abuts against the first end of the carrier plate 331, the distance between the abutting position of the first driving electrode 334 and the rotating shaft 32 is less than the distance from the rotating shaft 32 to the first end of the carrier plate 331, so as to ensure that the first driving electrode 334 can abut against the carrier plate 331.

[0063] Similarly, the distance between the second driving electrode 335 and the rotation axis of the carrier plate 331 is less than the rotation radius of the carrier plate 331. When the second driving electrode 335 abuts against the second end of the carrier plate 331, the distance between the abutting position of the second driving electrode 335 and the rotating shaft 32 is less than the distance from the rotating shaft 32 to the second end of the carrier plate 331, so as to ensure that the second driving electrode 335 can abut against the carrier plate 331.

[0064] The carrier plate 331 rotates between the first driving electrode 334 and the second driving electrode 335, that is, the first driving electrode 334 and the second driving electrode 335 form a rotation space for the carrier plate 331. For example, when the fingerprint recognition sensor 30 is in working state, the black electrode 333 and the first driving electrode 334 have different electrical properties, and an adsorption force is generated between the black electrode 333 and the first driving electrode 334, so that the carrier plate 331 is adsorbed onto the first driving electrode 334 and abuts against the first driving electrode 334, so that the photosensitive surface 332 of the fingerprint recognition sensor 30 faces the screen 10.

[0065] Conversely, when the fingerprint sensor 30 is not in operation, the black electrode 333 and the first driving electrode 334 have the same electrical properties, and a repulsive force is generated between the black electrode 333 and the first driving electrode 334, thereby causing the carrier plate 331 to rotate and be attracted to the second driving electrode 335 and come into contact with the second driving electrode; so that the black electrode 333 of the fingerprint sensor 30 faces the screen 10 and can absorb the light irradiated by the screen 10 into the through hole 21.

[0066] In this embodiment, the first driving electrode 334 and the second driving electrode 335 can be selectively arranged in the through hole 21; for example, along the rotation direction of the carrier plate 331, the first driving electrode 334 and the second driving electrode 335 can be arranged on both sides of the carrier plate 331; or, the first driving electrode 334 and the second driving electrode 335 can be arranged on the same side of the carrier plate 331; the arrangement of the first driving electrode 334 and the second driving electrode 335 will be described in the following embodiments of this application.

[0067] Continue reading Figure 3 and Figure 4 In this embodiment of the application, the first driving electrode 334 and the second driving electrode 335 are both arranged on the side of the carrier plate 331 away from the screen body 10. The first driving electrode 334 is disposed close to the first end of the carrier plate 331 and can abut against the first end of the carrier plate 331. The second driving electrode 335 is disposed further away from the carrier plate 331 than the first driving electrode 334. That is, the second driving electrode 335 can be disposed on the side of the first driving electrode 334 away from the carrier plate 331, and can ensure that after the carrier plate 331 is rotated clockwise by a certain angle, the second end of the carrier plate 331 can abut against the second driving electrode 335.

[0068] For example, the second driving electrode 335 is located directly below the first driving electrode 334. When the fingerprint recognition sensor 30 is in working condition, the first driving electrode 334 is positively charged, the black electrode 333 is negatively charged, and an adsorption force is generated between them. The first end of the carrier plate 331 can be adsorbed onto the first driving electrode 334 and abut against the first driving electrode 334; at this time, the photosensitive surface 332 of the fingerprint recognition sensor 30 faces the screen 10.

[0069] When the fingerprint sensor 30 is not in operation, the black electrode 333 is positively charged and the first driving electrode 334 is positively charged. The two electrodes have the same charge and generate a repulsive force between them. The carrier plate 331 can rotate clockwise, and the second end of the carrier plate 331 can abut against the second driving electrode 335. The second driving electrode 335 is negatively charged and has the opposite charge to the black electrode 333. The two electrodes generate an adsorption force, which allows the carrier plate 331 to be adsorbed onto the second driving electrode 335 and abut against the second driving electrode 335. At this time, the black electrode 333 faces the side of the screen 10.

[0070] like Figure 5 and Figure 6As shown, in some embodiments, the first driving electrode 334 and the second driving electrode 335 may be disposed on the side of the carrier plate 331 facing the screen 10, and the first driving electrode 334 is disposed near the second end of the carrier plate 331 and can abut against the second end of the carrier plate 331. When the first driving electrode 334 abuts against the second end of the carrier plate 331, the fingerprint recognition sensor 30 is in working state, and its photosensitive surface 332 faces the side of the screen 10.

[0071] The second driving electrode 335 can be disposed on the side of the first driving electrode 334 away from the carrier plate 331. For example, the second driving electrode 335 can be disposed above the first driving electrode 334, ensuring that after the carrier plate 331 is rotated clockwise by a certain angle, the first end of the carrier plate 331 can abut against the second driving electrode 335. When the first end of the carrier plate 331 abuts against the second driving electrode 335, the fingerprint recognition sensor 30 is in a non-working state, and its black electrode 333 faces the side of the screen 10.

[0072] like Figure 7 and Figure 8 As shown, in some embodiments, along the rotation direction of the carrier plate 331, the first driving electrode 334 and the second driving electrode 335 are respectively arranged on both sides of the carrier plate 331 and located above the rotating shaft 32.

[0073] The first driving electrode 334 and the second driving electrode 335 are both located within the rotation range of the carrier plate 331. When the fingerprint recognition sensor 30 performs fingerprint recognition, the first driving electrode 334 can abut against the first end of the carrier plate 331 and contact the black electrode 333 on the second surface of the carrier plate 331. The second driving electrode 335 can be located at the same height as the first driving electrode 334. When the fingerprint recognition sensor 30 does not perform fingerprint recognition, the carrier plate 331 can rotate clockwise by a certain angle, and its first end can abut against the second driving electrode 335 and contact the photosensitive surface 332 of the carrier plate 331.

[0074] For example, when the fingerprint sensor 30 is in working condition, the first driving electrode 334 is positively charged and the black electrode 333 is negatively charged, and an adsorption force is generated between them. The first end of the carrier plate 331 can be adsorbed onto the first driving electrode 334 and abut against the first driving electrode 334. At this time, the photosensitive surface 332 of the fingerprint sensor 30 faces the screen 10.

[0075] When the fingerprint sensor 30 is not in operation, the black electrode 333 is positively charged and the first driving electrode 334 is positively charged. The two electrodes have the same charge and generate a repulsive force between them. The carrier plate 331 can rotate clockwise. The first end of the carrier plate 331 can come into contact with the second driving electrode 335. The second driving electrode 335 is negatively charged and has the opposite charge to the black electrode 333. The two electrodes generate an adsorption force, which allows the carrier plate 331 to be adsorbed onto the second driving electrode 335. At this time, the black electrode 333 faces the side of the screen 10.

[0076] In an alternative embodiment, the first driving electrode 334 and the second driving electrode 335 may also be arranged on both sides of the carrier plate 331 and located below the rotating shaft 32, which will not be described in detail here.

[0077] like Figure 9 and Figure 10 As shown, based on the above embodiments, the driving unit provided in this application embodiment further includes a first limiting block 336 and / or a second limiting block 337, wherein the first limiting block 336 and the first driving electrode 334 are symmetrically arranged about the rotation axis 32. When the first driving electrode 334 abuts against the first end of the carrier plate 331, the first limiting block 336 can abut against the second end of the carrier plate 331 to limit the tilt angle A of the carrier plate 331 in this state; for example, in this application embodiment, the tilt angle A of the carrier plate 331 in this state is between 30° and 45°.

[0078] The second limiting block 337 and the second driving electrode 335 are symmetrically arranged about the rotation axis 32. When the second driving electrode 335 abuts against the second end of the carrier plate 331, the second limiting block 337 can abut against the first end of the carrier plate 331 to limit the tilt angle B of the carrier plate 331 in this state. For example, in the embodiment of this application, the tilt angle B of the carrier plate 331 in this state is between 30° and 45°.

[0079] For example, the driving unit provided in this application embodiment includes a first limiting block 336 and a second limiting block 337; the first driving electrode 334 and the second driving electrode 335 are both disposed on the side of the carrier plate 331 away from the screen body 10; the first driving electrode 334 is disposed near the first end of the carrier plate 331, the second driving electrode 335 is located below the first driving electrode 334, and the first driving electrode 334 and the second driving electrode 335 have opposite electrical properties.

[0080] The first limiting block 336 and the first driving electrode 334 are symmetrically arranged about the rotation axis 32, and the second limiting block 337 and the second driving electrode 335 are symmetrically arranged about the rotation axis 32. That is, the first limiting block 336 and the second limiting block 337 are both arranged on the side of the carrier plate 331 facing the screen body 10, and the first limiting block 336 is arranged near the second end of the carrier plate 331, and the second limiting block 337 is located above the first limiting block 336.

[0081] When the fingerprint recognition sensor 30 is in working state, the first driving electrode 334 is positively charged and the black electrode 333 is negatively charged, and the two generate an adsorption force. The first end of the carrier plate 331 is adsorbed to the first driving electrode 334 and abuts against the first driving electrode 334. At this time, the second end of the carrier plate 331 abuts against the first limiting block 336. At this time, the photosensitive surface 332 of the carrier plate 331 faces the screen body 10.

[0082] When the fingerprint sensor 30 is not in operation, the first driving electrode 334 is positively charged and the black electrode 333 is positively charged, generating a repulsive force between them. Under the action of the repulsive force, the carrier plate 331 rotates clockwise, and the second end of the carrier plate 331 abuts against the second driving electrode 335. The second driving electrode 335 is negatively charged, so an adsorption force is generated between the second driving electrode 335 and the black electrode 333. The second end of the carrier plate 331 can be adsorbed to the second driving electrode 335 and abut against the second driving electrode 335. At this time, the first end of the carrier plate 331 abuts against the second limiting block 337, and the black electrode 333 faces the screen body 10.

[0083] It should be noted that, since the arrangement of the first driving electrode 334 and the second driving electrode 335 is different, and the first limiting block 336 and the first driving electrode 334 are symmetrically arranged about the rotation axis 32, and the second limiting block 337 and the second driving electrode 335 are symmetrically arranged about the rotation axis 32, the arrangement of the first limiting block 336 and the second limiting block 337 is also different, which will not be elaborated here.

[0084] Furthermore, in order to improve the adsorption stability between the carrier plate 331 and the first driving electrode 334 and the second driving electrode 335, the first limiting block 336 provided in this application embodiment can be an electrode with the same electrical properties as the first driving electrode 334, and the second limiting block 337 can be an electrode with the same electrical properties as the second driving electrode 335.

[0085] With this configuration, when the first end of the carrier plate 331 is attracted to the first driving electrode 334, the second end of the carrier plate 331 can be attracted to the first limiting block 336. When the second end of the carrier plate 331 is attracted to the second driving electrode 335, the first end of the carrier plate 331 can be attracted to the second limiting block 337. This improves the stability of the carrier plate 331 in maintaining the orientation of its photosensitive surface 332 or its black electrode 333 toward the screen 10 when the fingerprint recognition sensor 30 is in different states.

[0086] Based on the above embodiments, the first driving electrode 334, the second driving electrode 335, the first limiting block 336 and the second limiting block 337 in this application embodiment are all transparent electrodes to avoid blocking the light carrying fingerprint information and improve the fingerprint recognition function of the fingerprint recognition sensor 30.

[0087] like Figure 11 As shown, the fingerprint recognition sensor 30 in this embodiment may include multiple photosensitive units 33. These photosensitive units 33 can be independently disposed within a frame 31 and arranged in an array within the frame 31. Each photosensitive unit 33 can rotate synchronously relative to the frame 31. For example, multiple photosensitive units 33 located in the same row or column can be mounted on the same rotating shaft 32. Both ends of the rotating shaft 32 protrude beyond the outermost photosensitive unit 33, and both ends of the rotating shaft 32 are rotatably connected to the frame 31. This arrangement reduces the space required for the rotation of each photosensitive unit, which is beneficial for miniaturizing the display device.

[0088] It should be noted that the display device 100 provided in this application embodiment also includes an IC control terminal and a power supply unit connected to it by signal; when the fingerprint recognition sensor 30 is in working state (when the operator's finger touches the fingerprint recognition area of ​​the screen 10, that is, when the fingerprint recognition sensor 30 performs fingerprint recognition), the control terminal can control the power supply unit to supply power to the black electrode 333.

[0089] For example, Figure 12 This is a schematic diagram showing the state of multiple photosensitive units when the fingerprint recognition sensor provided in this application is in working condition. Figure 12 As shown, the power supply unit can supply power to the rotating shaft 32 according to the working state of the fingerprint recognition sensor 30, and transmit it to the black electrode 333 through the rotating shaft 32, so that the electrical properties of the black electrode 333 are opposite to those of the first driving electrode 334, and so that it is attracted to the first driving electrode 334, so that the photosensitive surface 332 of the fingerprint recognition sensor 30 faces the screen 10 and can receive light carrying fingerprint information, thereby realizing the fingerprint recognition function.

[0090] Figure 13 This is a schematic diagram showing the state of multiple photosensitive units when the fingerprint recognition sensor provided in this embodiment is in a closed state. Figure 13As shown, when the fingerprint sensor 30 is not in operation, the control terminal can control the power supply unit to supply power to the black electrode 333, so that the electrical properties of the black electrode 333 are the same as those of the first driving electrode 334 and opposite to those of the second driving electrode 335. This drives the carrier plate 331 to rotate, so that the black electrode 333 of the fingerprint sensor 30 faces the screen 10 to absorb the light irradiated into the through hole 21 by the screen 10. At the same time, it also eliminates the possibility of observing the fingerprint sensor 30 in the fingerprint recognition area under certain conditions during non-fingerprint recognition, thus improving the display effect.

[0091] Understandably, in this embodiment, the electrical properties of the black electrode 333 are changed according to the working state of the fingerprint sensor 30, while the electrical properties of the first driving electrode 334 and the second driving electrode 335 remain unchanged, so that the black electrode 333 is attracted to different driving electrodes in different working states of the fingerprint sensor 30, thereby causing the carrier plate 331 to rotate. Thus, when the fingerprint sensor 30 is working, its photosensitive surface 332 faces the screen 10, and conversely, the black electrode 333 faces the screen 10.

[0092] In this embodiment, the electrical properties of the first driving electrode 334 and the second driving electrode 335 can be changed according to actual needs when the fingerprint recognition sensor 30 is in different working states, while the electrical property of the black electrode 333 remains unchanged. This also enables the carrier plate 331 to rotate when the fingerprint recognition sensor 30 is in different working states, so that when the fingerprint recognition sensor 30 is working, its photosensitive surface 332 faces the screen 10, and vice versa, the black electrode 333 faces the screen 10. This embodiment does not impose any limitations on this.

[0093] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0094] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0095] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0096] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0097] As used herein, the term "substrate" refers to the material on which subsequent material layers are added. The substrate itself may be patterned. The material added on top of the substrate may be patterned or may remain unpatterned. Furthermore, the substrate may include a wide range of materials, such as silicon, germanium, gallium arsenide, indium phosphide, etc. Alternatively, the substrate may be made of a non-conductive material (e.g., glass, plastic, or sapphire wafers).

[0098] The term "layer" as used herein can refer to a portion of material comprising a region of thickness. A layer may extend over the entire underlying or overlying structure, or may have a extent smaller than that of the underlying or overlying structure. Furthermore, a layer may be a region of a homogeneous or non-homogeneous continuous structure, with a thickness less than that of the continuous structure. For example, a layer may be located between the top and bottom surfaces of the continuous structure, or between any pairs of lateral planes at the top and bottom surfaces. A layer may extend laterally, vertically, and / or along a tapered surface. A substrate may be a layer, and may include one or more layers, and / or may have one or more layers located on, above, and / or below it. A layer may include multiple layers. For example, an interconnect layer may include one or more conductor and contact layers (forming contacts, interconnects, and / or vias therein) and one or more dielectric layers.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display device, characterized in that, It includes a screen and a fingerprint recognition sensor. The backlight side of the screen is provided with a shielding layer, and the shielding layer is provided with through holes. The fingerprint recognition sensor includes a driving unit and a photosensitive unit. The first surface of the photosensitive unit is a photosensitive surface, and the second surface of the photosensitive unit is a light-absorbing surface. The first surface and the second surface are arranged opposite to each other, and at least a portion of the orthogonal projection of the photosensitive unit on the shielding layer covers the through hole. When the fingerprint sensor performs fingerprint recognition, the photosensitive surface faces the screen; when the fingerprint sensor does not perform fingerprint recognition, the driving unit drives the photosensitive unit to rotate so that the light-absorbing surface faces the screen. The fingerprint recognition sensor also includes a frame fixed to the shielding layer; The photosensitive unit includes a carrier plate, which is rotatably connected to the frame via a rotating shaft; A photosensitive element is disposed on the first surface of the carrier plate, and a black electrode covering the photosensitive element is disposed on the second surface of the carrier plate.

2. The display device according to claim 1, characterized in that, The driving unit further includes a first driving electrode and a second driving electrode with different electrical properties; The distances between the first driving electrode, the second driving electrode and the rotating shaft are both less than the rotation radius of the carrier plate, and the first driving electrode and the second driving electrode form a rotation space for the carrier plate. When the first driving electrode and the black electrode have different electrical properties, the first end of the carrier plate is attracted to the first driving electrode, so that the photosensitive surface faces the screen. When the second driving electrode and the black electrode have different electrical properties, the carrier plate rotates and the second end of the carrier plate is attracted to the second driving electrode, so that the black electrode faces the screen.

3. The display device according to claim 2, characterized in that, Along the rotation direction of the carrier plate, the first driving electrode and the second driving electrode are both disposed on the same side of the carrier plate, and the second driving electrode is disposed further away from the carrier plate than the first driving electrode; The first driving electrode is configured to abut against the first end of the carrier plate when the fingerprint recognition sensor performs fingerprint recognition; The second driving electrode is configured to abut against the second end of the carrier plate when the fingerprint recognition sensor is not performing fingerprint recognition.

4. The display device according to claim 2, characterized in that, Along the rotation direction of the carrier plate, the first driving electrode and the second driving electrode are respectively disposed on both sides of the carrier plate; The first driving electrode is configured to abut against the first end of the carrier plate when the fingerprint recognition sensor performs fingerprint recognition; The second driving electrode is configured to abut against the first end of the carrier plate when the fingerprint recognition sensor is not performing fingerprint recognition.

5. The display device according to claim 2, characterized in that, The driving unit further includes a first limiting block, which is symmetrically arranged with the first driving electrode about the rotation axis. And / or, the driving unit further includes a second limiting block, which is symmetrically arranged with respect to the second driving electrode about the rotation axis.

6. The display device according to claim 5, characterized in that, The first limiting block is an electrode with the same electrical properties as the first driving electrode; The second limiting block is an electrode with the same electrical properties as the second driving electrode.

7. The display device according to claim 6, characterized in that, The first driving electrode, the second driving electrode, the first limiting block, and the second limiting block are all transparent electrodes.

8. The display device according to any one of claims 2 to 7, characterized in that, The fingerprint recognition sensor includes multiple photosensitive units; Multiple photosensitive units are arranged in an array within the frame, and multiple photosensitive units located in the same row or column rotate synchronously.

9. The display device according to claim 8, characterized in that, Multiple photosensitive units located in the same row or column are mounted on the same rotating shaft.

10. The display device according to claim 1, characterized in that, The fingerprint sensor is disposed within the through hole; or The fingerprint recognition sensor is located on the side of the shielding layer away from the screen body and is opposite to the through hole.

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