Display device with fingerprint recognition and method of using the same

Abstract

Embodiments of the present application provide a display device with fingerprint identification and a method for using the same. The display device includes a display panel, a support film, a fingerprint identification module, and a liquid crystal lens film. The display panel has a touch area. The support film is located on one side of the display panel. The fingerprint identification module is disposed on the side of the support film away from the display panel. The liquid crystal lens film is disposed between the display panel and the support film. The liquid crystal lens film has a first working state when the touch area is in a touch unlocking operation. The liquid crystal lens film has a second working state when the touch area is in a non-touch unlocking operation. The light transmittance of the liquid crystal lens film in the first working state is greater than the light transmittance of the liquid crystal lens film in the second working state.

Description

Technical Field

[0001] This application relates to the field of fingerprint recognition technology, specifically to a display device with fingerprint recognition and its usage method. Background Technology

[0002] Organic light-emitting diode (OLED) and flat panel display devices based on light-emitting diode (LED) technologies are widely used in various consumer electronics products such as mobile phones, televisions, laptops, and desktop computers due to their advantages such as high image quality, energy saving, thin body and wide range of applications, becoming the mainstream of display devices.

[0003] Fingerprint recognition is typically placed on the home button or the back of the phone. However, with the widespread adoption of full-screen displays and consumers' pursuit of a seamless, integrated design, creating a dedicated notch for fingerprint recognition is no longer the optimal solution. As fingerprint recognition technology in smartphones continues to advance, under-display fingerprint technology (FOD, Fingerprint-On-Display or Fingerprint Underdisplay) has become one of the primary fingerprint recognition technologies. Improving fingerprint recognition sensitivity is crucial for enhancing under-display fingerprint technology. Summary of the Invention

[0004] This application provides a display device with fingerprint recognition and a method for using the same, with the aim of improving the sensitivity of fingerprint recognition.

[0005] An embodiment of the first aspect of this application provides a display device with fingerprint recognition, which includes a display panel, a support film, a fingerprint recognition module, and a liquid crystal lens film.

[0006] The display panel has a touch area.

[0007] The support film is located on one side of the display panel and covers the display panel.

[0008] The fingerprint recognition module is located on the side of the support film away from the display panel. The fingerprint recognition module is used to receive the light emitted from the display panel, reflected by the touch subject, and emitted from the display panel and the support film, and generate an induced electrical signal based on the received light.

[0009] A liquid crystal lens film is disposed at least between the display panel and the support film, and the orthographic projection of the liquid crystal lens film onto the support film at least partially overlaps with the orthographic projection of the fingerprint recognition module onto the support film.

[0010] When the touch area is in the touch unlock operation, the liquid crystal lens film has the first working state.

[0011] When the touch area is in a non-touch unlocking operation, the liquid crystal lens film has a second working state, and the light transmittance of the liquid crystal lens film in the first working state is greater than the light transmittance of the liquid crystal lens film in the second working state.

[0012] According to an embodiment of the first aspect of this application, when the liquid crystal lens film is in a first working state, the liquid crystal lens film is used to enhance the light incident onto the support film.

[0013] According to an embodiment of the first aspect of this application, when the liquid crystal lens film is in a second working state, the liquid crystal lens film is used to diffuse the light reflected by the support film.

[0014] According to an embodiment of the first aspect of this application, the liquid crystal lens film is further disposed on the side of the support film opposite to the display panel, and the orthographic projection of the liquid crystal lens film on the support film on the side of the support film opposite to the display panel at least partially overlaps with the orthographic projection of the fingerprint recognition module on the support film.

[0015] According to an embodiment of the first aspect of this application, the thickness of the liquid crystal lens film is from 1 μm to 100 μm.

[0016] According to an embodiment of the first aspect of this application, the display device further includes a foam layer with a hollow area, and at least a portion of the orthographic projection of the liquid crystal lens film onto the foam layer falls into the hollow area.

[0017] According to an embodiment of the first aspect of this application, in the direction perpendicular to the thickness of the liquid crystal lens film, the size of the cutout area is less than or equal to the maximum size of the liquid crystal lens film.

[0018] According to an embodiment of the first aspect of this application, the thickness of the foam layer is greater than the thickness of the support film.

[0019] According to an embodiment of the first aspect of this application, the liquid crystal lens film includes a liquid crystal layer and an electrode layer, with the electrode layer disposed on both sides of the liquid crystal layer along the thickness direction of the liquid crystal lens film.

[0020] According to an embodiment of the first aspect of this application, the liquid crystal lens film further includes an alignment layer disposed between the liquid crystal layer and the electrode layer.

[0021] According to an embodiment of the first aspect of this application, the electrode layer comprises a transparent conductive material.

[0022] According to an embodiment of the first aspect of this application, the transparent conductive material includes at least one of indium tin oxide, zinc oxide, or carbon nanotubes.

[0023] According to an embodiment of the first aspect of this application, the liquid crystal lens film includes a central region and an edge region disposed around the central region, wherein the thickness of the central region is greater than the thickness of the edge region.

[0024] According to an embodiment of the first aspect of this application, the thickness of the intermediate region is 2 to 4 times the thickness of the edge region.

[0025] According to an embodiment of the first aspect of this application, the display device further includes a control mechanism, which is electrically connected to the liquid crystal lens film.

[0026] Specifically, when the control mechanism detects that the touch area is in the fingerprint unlocking operation, the control mechanism applies a first voltage to the liquid crystal lens film to increase the transmittance of the liquid crystal lens film.

[0027] When the control mechanism detects that the touch area is in a non-fingerprint unlocking operation, the control mechanism applies a second voltage to the liquid crystal lens film to reduce the transmittance of the liquid crystal lens film. The first voltage and the second voltage are different.

[0028] According to an embodiment of the first aspect of this application, the display device further includes a filling layer located between the display panel and the support film. The filling layer has an opening extending through the thickness direction of the liquid crystal lens film, and the liquid crystal lens film is at least partially embedded in the opening.

[0029] According to an embodiment of the first aspect of this application, the filling layer is made of a non-light-absorbing material.

[0030] According to an embodiment of the first aspect of this application, the side of the support film facing the display panel is provided with an inwardly recessed groove, and the liquid crystal lens film is at least partially disposed in the groove.

[0031] According to an embodiment of the first aspect of this application, the groove depth is less than or equal to the thickness of the liquid crystal lens film.

[0032] An embodiment of the second aspect of this application provides a method of using a display device with fingerprint recognition, wherein the display device with fingerprint recognition is the aforementioned display device with fingerprint recognition, and the method of use includes:

[0033] Obtain the touch state of the display panel, including touch unlock operation and non-touch unlock operation;

[0034] When the touch state of the display panel is a touch unlock operation, the liquid crystal lens film is put into the first working state;

[0035] When the touch state of the display panel is a non-touch unlock operation, the liquid crystal lens film is put into a second working state.

[0036] The light transmittance of the liquid crystal lens film in the first working state is greater than that in the second working state.

[0037] According to an embodiment of the first aspect of this application, when the liquid crystal lens film is in a first working state, the liquid crystal lens film is used to enhance the light incident on the support film; or, when the liquid crystal lens film is in a second working state, the liquid crystal lens film is used to diffuse the light reflected by the support film.

[0038] The fingerprint recognition display device provided in this application has a liquid crystal lens film disposed at least between the display panel and the support film to change the light transmittance before entering the support film. When the touch area is in a touch unlock operation, the liquid crystal lens film has a first working state. In the first working state, the light transmittance of the liquid crystal lens film is high, which can effectively increase the light intensity entering the support film, thereby increasing the light flux received by the fingerprint recognition module and improving the sensitivity of the under-display optical fingerprint recognition. When the touch area is in a touch unlock operation, the liquid crystal lens film has a second working state. In the second working state, the light transmittance of the liquid crystal lens film is low. Compared with the first working state, this reduces the light flux received by the fingerprint recognition module. After the fingerprint unlock operation and during non-fingerprint unlock touches, this prevents the fingerprint recognition module from being constantly exposed to strong light, reducing the aging of the fingerprint recognition module and extending the service life of the display device. Attached Figure Description

[0039] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals denote the same or similar features, and the drawings are not drawn to scale.

[0040] Figure 1 This is a partial structural schematic diagram of a display device with fingerprint recognition provided in an embodiment of this application;

[0041] Figure 2 This is a partial structural schematic diagram of a display device with fingerprint recognition provided in another embodiment of this application;

[0042] Figure 3 This is a schematic cross-sectional view of the liquid crystal lens film of a fingerprint recognition display device provided in an embodiment of this application;

[0043] Figure 4 This is a schematic diagram of the structure of the liquid crystal lens film of a display device with fingerprint recognition provided in an embodiment of this application;

[0044] Figure 5 This is a partial structural schematic diagram of a display device with fingerprint recognition provided in another embodiment of this application;

[0045] Figure 6 This is a partial structural schematic diagram of a display device with fingerprint recognition provided in another embodiment of this application;

[0046] Figure 7 This is a flowchart illustrating a method of using a display device with fingerprint recognition according to an embodiment of this application.

[0047] Explanation of reference numerals in the attached figures:

[0048] 100. Display device;

[0049] 10. Display panel; 11. Touch area;

[0050] 20. Support membrane; 21. Groove;

[0051] 30. Fingerprint recognition module;

[0052] 40. Liquid crystal lens film; 41. Liquid crystal layer; 42. Electrode layer; 43. Alignment layer; 44. Intermediate region; 45. Edge region;

[0053] 50. Foam layer; 51. Perforated area;

[0054] 60. Control mechanism;

[0055] 70. Filler layer; 71. Opening;

[0056] Z, thickness direction. Detailed Implementation

[0057] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0059] It should be understood that when describing the structure of a component, when referring to a layer or region as being "above" or "on top of" another layer or region, it can mean that it is directly above the other layer or region, or that it contains other layers or regions between it and the other layer or region. Furthermore, if the component is flipped over, that layer or region will be located "below" or "under" the other layer or region.

[0060] In under-display fingerprint technology, optical sensing is the primary means of fingerprint recognition. This technology relies on a localized strong light emitted from the display panel to transmit the fingerprint information of the touch subject to the fingerprint recognition module located beneath the display panel. The fingerprint recognition module then converts the light signal carrying the fingerprint information into an electrical signal for identification. However, the reflected light from the fingerprint location passes through many layers in the OLED device. Since some layers have poor light transmittance, this can negatively impact fingerprint recognition performance, resulting in poor recognition capabilities and insensitivity. Furthermore, continuously emitting strong light in the fingerprint recognition area of ​​the phone increases display power consumption and shortens screen lifespan.

[0061] To address the aforementioned technical problems, this application provides a display device with fingerprint recognition and a method for using the same. The following description, in conjunction with the accompanying drawings, will illustrate various embodiments of the display device with fingerprint recognition and its method of use.

[0062] Please refer to the following: Figure 1 , Figure 1 This is a partial structural schematic diagram of a display device with fingerprint recognition provided in one embodiment of this application.

[0063] like Figure 1 As shown, an embodiment of the first aspect of this application provides a display device 100 with fingerprint recognition, which includes a display panel 10, a support film 20, a fingerprint recognition module 30, and a liquid crystal lens film 40.

[0064] The display panel 10 has a touch area 11.

[0065] The support film 20 is located on one side of the display panel 10 and covers the display panel 10.

[0066] The fingerprint recognition module 30 is disposed on the side of the support film 20 away from the display panel 10. The fingerprint recognition module 30 is used to receive the light emitted by the display panel 10, which is reflected by the touch subject and emitted by the display panel 10 and the support film 20, and to generate an induced electrical signal based on the received light.

[0067] The liquid crystal lens film 40 is disposed at least between the display panel 10 and the support film 20, and the orthographic projection of the liquid crystal lens film 40 onto the support film 20 at least partially overlaps with the orthographic projection of the fingerprint recognition module 30 onto the support film 20.

[0068] When the touch area 11 is in the touch unlock operation, the liquid crystal lens film 40 has a first working state.

[0069] When the touch area 11 is in a non-touch unlocking operation, the liquid crystal lens film 40 has a second working state, and the light transmittance of the liquid crystal lens film 40 in the first working state is greater than the light transmittance of the liquid crystal lens film 40 in the second working state.

[0070] The display panel 10 includes an array of etchable substrates with driving circuitry to drive light-emitting units to emit light. The array of etchable substrates includes stacked semiconductor layers, conductive layers, and insulating layers. For example, the array of etchable substrates may include a substrate and a first conductive layer, a second conductive layer, and a third conductive layer stacked on one side of the substrate. An insulating layer is disposed between adjacent conductive layers.

[0071] For example, a pixel circuit is disposed on the substrate to be etched, and the pixel driving circuit includes a thin-film transistor and a storage capacitor. The thin-film transistor includes a semiconductor, a gate, a source, and a drain. The source and drain can be connected to the semiconductor through vias in an insulating layer. The storage capacitor includes a first plate and a second plate. As an example, the gate and the first plate can be located in a first conductive layer, the second plate can be located in a second conductive layer, and the source and drain can be located in a third conductive layer.

[0072] The display panel 10 is provided with a touch layer structure to form a touch area 11. Specifically, the first conductive layer, the second conductive layer, the third conductive layer and the touch layer are usually formed by magnetron sputtering to form a metal thin film, and then the metal thin film is patterned to form conductive structures such as gate, capacitor plate, data signal line, voltage signal line and touch signal line.

[0073] For example, the display panel 10 has a display area, and the display area is provided with a touch area 11. The touch area 11 may be a part of the display area; alternatively, the touch area 11 may be the entire display area.

[0074] The support film 20 is disposed on one side of the display panel 10. The support film 20 is used to protect the display panel 10 and reduce the damage to the display panel 10 caused by other components in the display device 100.

[0075] For example, the support film 20 can be attached to one side of the display panel 10 after the display panel 10 is manufactured and peeled off from the glass substrate.

[0076] In some examples, the fingerprint recognition module 30 is disposed on the side of the support film 20 away from the display panel 10. The fingerprint recognition module 30 includes a fingerprint recognition sensor for receiving light emitted from the display panel 10, reflected by the touch subject, and emitted by the display panel 10 and the support film 20.

[0077] In some examples, the liquid crystal lens film 40 is located between the display panel 10 and the support film 20. The orthographic projection of the liquid crystal lens film 40 onto the support film 20 at least partially overlaps with the orthographic projection of the fingerprint recognition module 30 onto the support film 20. This can be understood as follows: in the thickness direction Z perpendicular to the liquid crystal lens film 40, a portion of the orthographic projection of the liquid crystal lens film 40 overlaps with a portion of the fingerprint recognition module 30; or, in the thickness direction Z perpendicular to the liquid crystal lens film 40, the orthographic projection of the liquid crystal lens film 40 falls onto the fingerprint recognition module 30.

[0078] For example, the liquid crystal lens film 40 is located between the display panel 10 and the support film 20, and the size of the liquid crystal lens film 40 is equal to the size of the support film 20 in the direction perpendicular to the thickness direction Z of the liquid crystal lens film 40.

[0079] For example, the liquid crystal lens film 40 is located between the display panel 10 and the support film 20, and the size of the liquid crystal lens film 40 is smaller than the size of the support film 20 in the direction perpendicular to the thickness direction Z of the liquid crystal lens film 40.

[0080] The alignment of liquid crystal molecules in the liquid crystal lens film 40 changes under the influence of an electric field. Since liquid crystal molecules affect the polarization characteristics of light, the way light passes through the liquid crystal lens film 40 also changes when the molecular alignment changes, resulting in a change in transmittance. The liquid crystal lens film 40 utilizes electrodynamic control to alter transmittance. When a touch unlock operation is detected on the touch area 11 of the display panel 10, a first voltage is applied to give the liquid crystal lens film 40 a first operating state, resulting in relatively high light transmittance. When a non-touch unlock operation is detected on the touch area 11 of the display panel 10, a second voltage is applied to give the liquid crystal lens film 40 a second operating state, resulting in relatively low light transmittance. The first and second voltages are different.

[0081] The fingerprint recognition display device 100 provided in this application has a liquid crystal lens film 40 disposed at least between the display panel 10 and the support film 20 to change the light transmittance before entering the support film 20. When the touch area 11 is in a touch unlock operation, the liquid crystal lens film 40 has a first working state. The light transmittance of the liquid crystal lens film 40 in the first working state is relatively high, which can effectively increase the light intensity entering the support film 20, thereby increasing the light flux received by the fingerprint recognition module 30 and improving the sensitivity of the under-display optical fingerprint recognition. When the touch area 11 is in a touch unlock operation, the liquid crystal lens film 40 has a second working state. The light transmittance of the liquid crystal lens film 40 in the second working state is relatively low. Compared with the first working state, it reduces the light flux received by the fingerprint recognition module 30. After the fingerprint unlock operation and during non-fingerprint unlock operations, the fingerprint recognition module 30 is not constantly in a strong light state, reducing the aging of the fingerprint recognition module 30 and extending the service life of the display device 100.

[0082] According to an embodiment of the first aspect of this application, when the liquid crystal lens film 40 is in a first working state, the liquid crystal lens film 40 is used to enhance the light incident on the support film 20.

[0083] When the liquid crystal lens film 40 is in the first working state, a first voltage is applied to the liquid crystal lens film 40, so that the liquid crystal lens film 40 has a relatively high light transmittance and a low refractive index, thereby enhancing the light incident on the support film 20.

[0084] According to an embodiment of the first aspect of this application, when the liquid crystal lens film 40 is in a second working state, the liquid crystal lens film 40 is used to diffuse the light reflected by the support film 20.

[0085] When the liquid crystal lens film 40 is in the first working state, a first voltage is applied to the liquid crystal lens film 40, so that the liquid crystal lens film 40 has a relatively low light transmittance and disperses the light reflected by the support film 20, that is, disperses the reflected light from the fingerprint recognition module 30 to the display panel 10, thereby reducing the light leakage current of the thin film transistor in the display panel 10 and improving the image quality of the display panel 10.

[0086] See also Figure 2 , Figure 2 This is a partial structural schematic diagram of a display device with fingerprint recognition provided in another embodiment of this application.

[0087] According to the implementation method of the first aspect of this application, such as Figure 2 As shown, the liquid crystal lens film 40 is also disposed on the side of the support film 20 away from the display panel 10. The orthographic projection of the liquid crystal lens film 40 on the support film 20 away from the display panel 10 at least partially overlaps with the orthographic projection of the fingerprint recognition module 30 on the support film 20.

[0088] For example, the display device 100 includes a first liquid crystal lens film and a second liquid crystal lens film. The first liquid crystal lens film is disposed on the side of the support film 20 facing the display panel 10, and the second liquid crystal lens film is disposed on the side of the support film 20 away from the display panel 10. The orthographic projection of the first liquid crystal lens film onto the support film 20 at least partially overlaps with the orthographic projection of the fingerprint recognition module 30 onto the support film 20, and the orthographic projection of the second liquid crystal lens film onto the support film 20 at least partially overlaps with the orthographic projection of the fingerprint recognition module 30 onto the support film 20. That is, at least a portion of the first liquid crystal lens film and the second liquid crystal lens film overlap along the thickness direction Z.

[0089] In some examples, the light transmittance of the first liquid crystal lens film and the second liquid crystal lens film can be adjusted separately. In addition, the light reflected from the fingerprint recognition module 30 into the support film 20 can be reduced by electro-tuning the second liquid crystal lens film, thereby reducing the light leakage of the thin-film transistors in the display panel 10 and further improving the image quality of the display panel 10.

[0090] In some examples, the thickness of the first liquid crystal lens film is different from the thickness of the second liquid crystal lens film.

[0091] Preferably, the thickness of the liquid crystal lens film 40 is from 1 μm to 100 μm.

[0092] More preferably, the thickness of the liquid crystal lens film 40 is 5 μm to 80 μm.

[0093] More preferably, the thickness of the liquid crystal lens film 40 is 10 μm to 50 μm.

[0094] In these optional embodiments, a liquid crystal lens film 40 is also provided on the side of the support film 20 facing away from the display panel 10. That is, liquid crystal lens films 40 are provided on both sides of the support film 20. Thus, the light emitted from the display panel 10 can be focused by the liquid crystal lens film 40 on the side facing the display panel 10 before passing through the support film 20, so that the light enters the support film 20 more concentratedly. The light emitted from the support film 20 towards the fingerprint recognition module 30 can be focused and adjusted again after passing through the liquid crystal lens film 40, further improving the concentration and accuracy of the light reaching the fingerprint recognition module 30, thereby enhancing the fingerprint recognition effect and improving the clarity and quality of the fingerprint image.

[0095] According to the implementation method of the first aspect of this application, such as Figure 1 and Figure 2 As shown, the display device 100 also includes a foam layer 50, which has a cutout area 51. At least a portion of the orthographic projection of the liquid crystal lens film 40 onto the foam layer 50 falls into the cutout area 51.

[0096] Preferably, in the thickness direction Z perpendicular to the liquid crystal lens film 40, the size of the hollow area 51 is less than or equal to the maximum size of the liquid crystal lens film 40.

[0097] Preferably, the thickness of the foam layer 50 is greater than the thickness of the support film 20.

[0098] In some examples, the structure of the foam layer 50 matches the structure of the support film 20, which in turn matches the structure of the display panel 10. For example, if the display panel 10 has a rectangular structure, then the support film 20 has a rectangular structure, and similarly, the foam layer 50 has a rectangular structure.

[0099] In some examples, the fingerprint recognition module 30 covers the cutout area 51 in the orthographic projection of the foam layer 50.

[0100] Preferably, in the thickness direction Z perpendicular to the liquid crystal lens film 40, the size of the hollow area 51 is smaller than the size of the fingerprint recognition module 30.

[0101] In these optional embodiments, the foam layer 50 has good elasticity and flexibility, which can provide cushioning for the fingerprint recognition module 30 when the display device 100 is subjected to external impact or compression, reducing the risk of damage caused by collision and ensuring that the internal structure and circuitry of the fingerprint recognition module 30 are not damaged. Furthermore, based on the structural characteristics of the foam layer 50 itself, even if there are certain tolerances in the dimensions and installation positions of the support film 20 and the fingerprint recognition module 30, as well as tolerances caused by the presence of the liquid crystal lens film 40, the foam layer 50 compensates for the dimensional differences and positional deviations between components through its own compression deformation, thereby improving the flatness of the display panel 10 with the liquid crystal lens film 40.

[0102] See also Figure 3 , Figure 3 This is a schematic cross-sectional view of the liquid crystal lens film of a display device with fingerprint recognition provided in an embodiment of this application.

[0103] According to the implementation method of the first aspect of this application, such as Figure 1 and Figure 3 As shown, the liquid crystal lens film 40 includes a liquid crystal layer 41 and an electrode layer 42, with the electrode layer 42 disposed on both sides of the liquid crystal layer 41 along the thickness direction Z of the liquid crystal lens film 40.

[0104] For example, the liquid crystal lens film 40 includes a liquid crystal layer 41, a first electrode layer 42, and a second electrode layer 42, which are disposed on both sides of the liquid crystal layer 41 along the thickness direction Z of the liquid crystal lens film 40.

[0105] The first electrode layer 42 is a common electrode used to provide a common voltage during operation. Optionally, the first electrode layer 42 is a layered structure made of transparent metal, such as indium tin oxide.

[0106] Optionally, a first substrate is provided on the side of the first electrode layer 42 opposite to the liquid crystal layer 41. The first substrate is a transparent and rigid plate-like structure, for example, made of materials such as glass, quartz, or plastic.

[0107] One or more second electrode layers 42 may be provided for inputting driving voltage to control the deflection of liquid crystal at different positions. Optionally, the second electrode layer 42 is a slit electrode made of a transparent metal layer, and the second electrode layer 42 is made of a transparent metal material such as indium tin oxide.

[0108] Optionally, a second substrate is provided on the side of the second electrode layer 42 opposite to the liquid crystal layer 41. The second substrate is a transparent and rigid plate-like structure, for example, made of materials such as glass, quartz, or plastic.

[0109] Preferably, the liquid crystal lens film 40 further includes an alignment layer 43, which is disposed between the liquid crystal layer 41 and the electrode layer 42.

[0110] For example, a first alignment layer 43 is provided on the side of the first electrode layer 42 facing the liquid crystal layer 41, and a second alignment layer 43 is provided on the side of the second electrode layer 42 facing the liquid crystal layer 41.

[0111] During operation, a constant common voltage is provided to the first electrode layer 42, and a driving voltage is output to the second electrode layer 42 to control the voltage difference between the two electrode layers. This voltage difference generates a vertical electric field, which drives the liquid crystal in the liquid crystal layer 41 to deflect. Different driving voltages are output to the second electrode layer 42, resulting in vertical electric fields of varying magnitudes. These fields cause the liquid crystal in the liquid crystal layer 41 to deflect to different degrees. Liquid crystals with larger vertical electric fields tend to be vertically distributed, resulting in higher effective light transmittance, while liquid crystals with smaller vertical electric fields tend to be horizontally arranged, resulting in lower effective light transmittance. This achieves different lens effects.

[0112] Preferably, the electrode layer 42 comprises a transparent conductive material.

[0113] Preferably, the transparent conductive material includes at least one of indium tin oxide, zinc oxide, or carbon nanotubes.

[0114] See also Figure 4 , Figure 4This is a schematic diagram of the structure of the liquid crystal lens film of a display device with fingerprint recognition provided in an embodiment of this application.

[0115] According to the implementation method of the first aspect of this application, such as Figure 1 and Figure 4 As shown, the liquid crystal lens film 40 includes a central region 44 and an edge region 45 surrounding the central region 44, and the thickness of the central region 44 is greater than the thickness of the edge region 45.

[0116] In some examples, the display device 100 includes a first liquid crystal lens film and a second liquid crystal lens film. The thickness of the middle region of the first liquid crystal lens film is greater than the thickness of the edge region, and the thickness of the middle region of the second liquid crystal lens film is greater than the thickness of the edge region. The thickness of the middle region of the first liquid crystal lens film and the thickness of the middle region of the second liquid crystal lens film may be equal or unequal, and the thickness of the edge region of the first liquid crystal lens film and the thickness of the edge region of the second liquid crystal lens film may be equal or unequal.

[0117] For example, the liquid crystal lens film 40 has a first surface and a second surface opposite to each other along the thickness direction Z. The first surface faces the display panel 10, and the second surface faces away from the display panel 10. The first surface located in the middle region 44 protrudes from the first surface located in the edge region 45, and the second surface located in the middle region 44 is flush with the second surface located in the edge region 45.

[0118] For example, the liquid crystal lens film 40 has a first surface and a second surface opposite to each other along the thickness direction Z. The first surface faces the display panel 10, and the second surface faces away from the display panel 10. The first surface located in the middle region 44 protrudes from the first surface located in the edge region 45; the second surface located in the middle region 44 protrudes from the second surface located in the edge region 45.

[0119] For example, the liquid crystal lens film 40 has a first surface and a second surface opposite to each other along the thickness direction Z. The first surface faces the display panel 10, and the second surface faces away from the display panel 10. The first surface located in the middle region 44 is flush with the first surface located in the edge region 45, and the second surface located in the middle region 44 protrudes from the second surface located in the edge region 45.

[0120] Preferably, the thickness of the middle region 44 is 2 to 4 times the thickness of the edge region 45.

[0121] In these alternative embodiments, the central region 44 is configured such that the light is more strongly refracted, concentrating the light more effectively onto the fingerprint recognition module 30. The thinner edges allow for a smoother transition of light, reducing light scattering and distortion at the edges, resulting in a more uniform and accurate light focusing effect. This helps improve the clarity and quality of the fingerprint image, thereby enhancing the accuracy of fingerprint recognition.

[0122] See also Figure 5 , Figure 5 This is a partial structural schematic diagram of a display device with fingerprint recognition provided in another embodiment of this application.

[0123] According to the implementation method of the first aspect of this application, such as Figure 5 As shown, the display device 100 also includes a control mechanism 60, which is electrically connected to the liquid crystal lens film 40.

[0124] When the control mechanism 60 detects that the touch area 11 is in a fingerprint unlocking operation, the control mechanism 60 applies a first voltage to the liquid crystal lens film 40 to increase the transmittance of the liquid crystal lens film 40.

[0125] When the control mechanism 60 detects that the touch area 11 is in a non-fingerprint unlocking operation, the control mechanism 60 applies a second voltage to the liquid crystal lens film 40 to reduce the transmittance of the liquid crystal lens film 40. The first voltage and the second voltage are different.

[0126] For example, the control mechanism 60 includes a controller, a touch detection element, and a voltage regulator. The touch detection element is used to detect whether a fingerprint unlocking operation exists in the touch area 11. The controller is used to receive the detection signal, determine the signal based on the detection signal, and issue a voltage signal. The voltage regulator adjusts the voltage applied to the liquid crystal lens film 40 according to the voltage signal.

[0127] In these alternative embodiments, this configuration allows for precise control of the voltage applied to the liquid crystal lens film 40, thereby accurately adjusting its transmittance. The performance of the liquid crystal lens film 40 can be dynamically adjusted according to different ambient light conditions and device status to improve fingerprint recognition sensitivity.

[0128] According to the implementation method of the first aspect of this application, such as Figure 5 As shown, the display device 100 also includes a filling layer 70, which is located between the display panel 10 and the support film 20. The filling layer 70 has an opening 71 that extends through the thickness direction Z of the liquid crystal lens film 40, and the liquid crystal lens film 40 is at least partially embedded in the opening 71.

[0129] For example, the filling layer 70 includes a layer body and an opening 71 that extends through the layer body, and the liquid crystal lens film 40 is at least partially embedded in the opening 71.

[0130] For example, the display device 100 includes two filling layers 70, each including a first filling layer and a second filling layer, located on opposite sides of the support film 20 along the thickness direction Z. The first filling layer has a through-hole, and the second filling layer has a through-hole, second opening. The display device 100 includes a first liquid crystal lens film and a second liquid crystal lens film, the first liquid crystal lens film being disposed within the first opening and the second liquid crystal lens film being disposed within the second opening.

[0131] In some examples, the thickness of the filling layer 70 is less than or equal to the thickness of the liquid crystal lens film 40.

[0132] Optionally, the thickness of the filling layer 70 is equal to the thickness of the liquid crystal lens film 40.

[0133] Preferably, the filler layer 70 is made of a non-light-absorbing material.

[0134] Preferably, the filler layer 70 is made of a transparent material.

[0135] In these alternative embodiments, by providing the filling layer 70, the gap between the display panel 10 and the support film 20 can be filled, which helps to improve the flatness of the display panel 10. Moreover, the liquid crystal lens film 40 is at least partially embedded in the opening 71 to limit the liquid crystal lens film 40 and reduce the movement of the liquid crystal lens film 40.

[0136] See also Figure 6 , Figure 6 This is a partial structural schematic diagram of a display device with fingerprint recognition provided in another embodiment of this application.

[0137] According to an embodiment of the first aspect of this application, the support film 20 has an inwardly recessed groove 21 on the side facing the display panel 10, and the liquid crystal lens film 40 is at least partially disposed in the groove 21.

[0138] Preferably, the groove depth of the groove 21 is less than or equal to the thickness of the liquid crystal lens film 40.

[0139] For example, the support film 20 has a first surface and a second surface opposite to each other along the thickness direction Z of the liquid crystal lens film 40. The first surface faces the display panel 10, and the second surface faces away from the display panel 10. The first surface has an inwardly recessed first groove, and the second surface has an inwardly recessed second groove. The display device 100 includes a first liquid crystal lens film and a second liquid crystal lens film. The first liquid crystal lens film is disposed in the first groove, and the second liquid crystal lens film is disposed in the second groove.

[0140] In these optional embodiments, the support film 20 has an inwardly recessed groove 21 on the side facing the display panel 10. The groove 21 is used to accommodate the liquid crystal lens film 40. On the one hand, it can limit the liquid crystal lens film 40, so that the liquid crystal lens film 40 is stably disposed between the support film 20 and the liquid crystal lens film 40. On the other hand, the liquid crystal lens film 40 is at least partially disposed in the groove 21, which reduces the additional space occupied by the liquid crystal lens film 40, improves the space utilization of the display device 100, and is conducive to the thin and light design of the display device 100.

[0141] See Figure 7 , Figure 7 This is a flowchart illustrating a method of using a display device with fingerprint recognition according to an embodiment of this application.

[0142] like Figure 7 As shown, an embodiment of the second aspect of this application provides a method of using a display device 100 with fingerprint recognition. The display device 100 with fingerprint recognition is the aforementioned display device 100 with fingerprint recognition, and the method of use includes:

[0143] Step S100: Obtain the touch state of the display panel 10, including touch unlock operation and non-touch unlock operation;

[0144] Step S200: When the touch state of the display panel 10 is a touch unlock operation, the liquid crystal lens film 40 is given a first working state; when the touch state of the display panel 10 is a non-touch unlock operation, the liquid crystal lens film 40 is given a second working state. The light transmittance of the liquid crystal lens film 40 in the first working state is greater than the light transmittance of the liquid crystal lens film 40 in the second working state.

[0145] Preferably, in step S200, when the liquid crystal lens film 40 is in the first working state, the liquid crystal lens film 40 is used to enhance the light incident on the support film 20.

[0146] When the liquid crystal lens film 40 is in the second working state, the liquid crystal lens film 40 is used to diffuse the light reflected by the support film 20.

[0147] The method of using the fingerprint recognition display device 100 provided in this application obtains the touch state of the display panel 10 to enable the liquid crystal lens film 40 to have different working states. When the touch area 11 is in a touch unlock operation, the liquid crystal lens film 40 is in a first working state. The light transmittance of the liquid crystal lens film 40 in the first working state is higher, which can effectively increase the light intensity entering the support film 20, thereby increasing the light flux received by the fingerprint recognition module 30 and improving the sensitivity of the under-display optical fingerprint recognition. When the touch area 11 is in a touch unlock operation, the liquid crystal lens film 40 is in a second working state. The light transmittance of the liquid crystal lens film 40 in the second working state is lower. Compared with the first working state, the light flux received by the fingerprint recognition module 30 is reduced. After the fingerprint unlock operation and during non-fingerprint unlock touch operations, the fingerprint recognition module 30 is not constantly in a strong light state, reducing the aging of the fingerprint recognition module 30 and extending the service life of the display device 100.

[0148] The display devices in this application include, but are not limited to, mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, control consoles, and other devices with display functions.

[0149] The embodiments described above are not exhaustive and do not limit the invention to specific examples. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to effectively utilize this application and its modifications. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A display device with fingerprint recognition, characterized in that, The display device with fingerprint recognition includes: A display panel having a touch area; A support film is located on one side of the display panel and covers the display panel; A fingerprint recognition module is disposed on the side of the support film opposite to the display panel. The fingerprint recognition module is used to receive light emitted from the display panel, reflected by the touch subject, and emitted by the display panel and the support film, and to generate an induced electrical signal based on the received light. A liquid crystal lens film is disposed at least between the display panel and the support film, wherein the orthographic projection of the liquid crystal lens film onto the support film at least partially overlaps with the orthographic projection of the fingerprint recognition module onto the support film. When the touch area is in a touch unlock operation, the liquid crystal lens film has a first working state; When the touch area is in a non-touch unlocking operation, the liquid crystal lens film has a second working state, and the light transmittance of the liquid crystal lens film in the first working state is greater than the light transmittance of the liquid crystal lens film in the second working state.

2. The display device with fingerprint recognition according to claim 1, characterized in that, When the liquid crystal lens film is in its first working state, the liquid crystal lens film is used to enhance the light incident on the support film; and / or, When the liquid crystal lens film is in the second working state, the liquid crystal lens film is used to diffuse the light reflected by the support film.

3. The display device with fingerprint recognition according to claim 1, characterized in that, The liquid crystal lens film is also disposed on the side of the support film opposite to the display panel, and the orthographic projection of the liquid crystal lens film on the support film located on the side of the support film opposite to the display panel at least partially overlaps with the orthographic projection of the fingerprint recognition module on the support film. Preferably, the thickness of the liquid crystal lens film is from 1 μm to 100 μm.

4. The display device with fingerprint recognition according to claim 1, characterized in that, The display device further includes a foam layer, the foam layer having a hollow area, and at least a portion of the orthogonal projection of the liquid crystal lens film onto the foam layer falling into the hollow area; Preferably, in the direction perpendicular to the thickness of the liquid crystal lens film, the size of the cutout area is less than or equal to the maximum size of the liquid crystal lens film; Preferably, the thickness of the foam layer is greater than the thickness of the support film.

5. The display device with fingerprint recognition according to claim 1, characterized in that, The liquid crystal lens film includes a liquid crystal layer and an electrode layer, wherein the electrode layer is disposed on both sides of the liquid crystal layer along the thickness direction of the liquid crystal lens film; Preferably, the liquid crystal lens film further includes an alignment layer, which is disposed between the liquid crystal layer and the electrode layer; Preferably, the electrode layer comprises a transparent conductive material; Preferably, the transparent conductive material includes at least one of indium tin oxide, zinc oxide, or carbon nanotubes.

6. The display device with fingerprint recognition according to claim 1, characterized in that, The liquid crystal lens film includes a central region and an edge region surrounding the central region, wherein the thickness of the central region is greater than the thickness of the edge region. Preferably, the thickness of the intermediate region is 2 to 4 times the thickness of the edge region.

7. The display device with fingerprint recognition according to claim 1, characterized in that, The display device further includes a control mechanism, which is electrically connected to the liquid crystal lens film. When the control mechanism detects that the touch area is in a fingerprint unlocking operation, the control mechanism applies a first voltage to the liquid crystal lens film to increase the transmittance of the liquid crystal lens film. When the control mechanism detects that the touch area is in a non-fingerprint unlocking operation, the control mechanism applies a second voltage to the liquid crystal lens film to reduce the transmittance of the liquid crystal lens film. The first voltage and the second voltage are different.

8. The display device with fingerprint recognition according to claim 1, characterized in that, The display device further includes a filling layer located between the display panel and the support film. The filling layer has an opening extending through the thickness direction of the liquid crystal lens film, and the liquid crystal lens film is at least partially embedded in the opening. Preferably, the filling layer is made of a non-light-absorbing material.

9. The display device with fingerprint recognition according to claim 1, characterized in that, The support film has an inwardly recessed groove on the side facing the display panel, and the liquid crystal lens film is at least partially disposed in the groove; Preferably, the groove depth is less than or equal to the thickness of the liquid crystal lens film.

10. A method of using a display device with fingerprint recognition, characterized in that, The fingerprint recognition display device is the fingerprint recognition display device according to any one of claims 1-9, and the method of use includes: Obtain the touch state of the display panel, including touch unlock operation and non-touch unlock operation; When the touch state of the display panel is a touch unlock operation, the liquid crystal lens film is given a first working state; When the touch state of the display panel is a non-touch unlock operation, the liquid crystal lens film is set to a second working state. Wherein, the light transmittance of the liquid crystal lens film in the first working state is greater than the light transmittance of the liquid crystal lens film in the second working state; Preferably, when the liquid crystal lens film is in the first working state, the liquid crystal lens film is used to enhance the light incident on the support film; or, when the liquid crystal lens film is in the second working state, the liquid crystal lens film is used to diffuse the light reflected by the support film.

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