Patent Description:
With the continuous development of smart mobile terminal technologies, fingerprint recognition is widely used. For example, fingerprint recognition can be used for screen unlocking, quick payment, encryption, and fingerprint key functions. The present fingerprint recognition solution mainly includes local under-screen optical fingerprint recognition for fingerprints on part of a screen. During optical fingerprint recognition, a fingerprint image is collected via a camera, and then the fingerprint image is compared with an enrollment fingerprint in a system. If the fingerprint image collected matches the enrollment fingerprint, the fingerprint recognition succeeds. However, the camera is relatively large, and thus a lot of space is occupied.

<CIT> discloses an input device for capacitive sensing in which an input biometric object is scanned by performing a differential measurement for one or more receiver electrodes with other receiver electrodes providing a reference, based on detected signals received on the one or more receiver electrodes and the other receiver electrodes, wherein the other receiver electrodes providing the reference are all receiver electrodes of the plurality of receiver electrodes that are determined as being covered by the input biometric object.

<CIT> discloses a capacitive touch detection device for detecting a touch signal by detecting a voltage difference of a sensor pattern from a driving voltage applied by an auxiliary capacitor. The device includes a charging unit for providing pre-charge signals to a touch capacitance formed by a sensor pattern and the auxiliary capacitor. A touch sensor detects a touch signal by detecting a voltage difference in the sensor pattern when the touch capacitance is added to the auxiliary capacitor according to a touch of a touch input instrument.

<CIT> discloses an apparatus configured to identify content including at least one object to be displayed on a display. If the content is not associated with acquisition of fingerprint information, the at least one object is displayed at a predetermined position, and if the content is associated with the acquisition of the fingerprint information, the at least one object is displayed in a part of the display area having a fingerprint sensor.

<CIT> relates to an electronic device that includes a touch screen, at least one fingerprint sensor disposed on the touch screen, and a processor. The touch screen is controlled to display one or more graphic objects. An area of the fingerprint sensor is activated based on attribute information detected for at least one of the graphic objects, the activated area of the fingerprint sensor corresponding to the at least one graphic object, and fingerprint information is acquired through the activated area of the fingerprint sensor.

Implementations provide a display assembly. The display assembly includes a flexible screen, a cover plate, and a capacitive fingerprint sensor film. The capacitive fingerprint sensor film is disposed between the cover plate and the flexible screen, where the capacitive fingerprint sensor film covers a display surface of the flexible screen, to sense a fingerprint of a finger in contact with the cover plate.

Implementations further provide an electronic device. The electronic device includes a display assembly and a casing coupled with the display assembly. The display assembly includes a flexible screen, a capacitive fingerprint sensor film, and a cover plate. The capacitive fingerprint sensor film is disposed between the cover plate and the flexible screen, where the capacitive fingerprint sensor film covers a display surface of the flexible screen, to sense a fingerprint of a finger in contact with the cover plate.

Implementations further provide a method for assembling a display assembly. The method includes the following. A flexible screen, a capacitive fingerprint sensor film, and a cover plate are provided. The capacitive fingerprint sensor film is arranged between the cover plate and the flexible screen, and the capacitive fingerprint sensor film covers a display surface of the flexible screen, so as to sense a fingerprint of a finger in contact with the cover plate.

In the display assembly, the electronic device, and the method for assembling a display assembly provided in the implementation of the present disclosure, the capacitive fingerprint sensor film covers the display surface of the flexible screen, such that full-screen fingerprint recognition can be achieved. Compared with local fingerprint recognition, the operation is more convenient. In addition, compared with optical fingerprint recognition, when the capacitive fingerprint sensor film is used for fingerprint recognition, a large camera is not needed, and only the capacitive fingerprint sensor film is needed, such that the electronic device is thin and design of the electronic device is simple.

The described-above and/or additional aspects and advantages of the implementations will become apparent and be easily understood from the description of the implementations in conjunction with the following drawings.

The following describes implementations in detail. Examples of the implementations are illustrated in the accompanying drawings, where the same or like reference numerals represent the same or like elements or elements having the same or similar functions. The implementations described below with reference to the accompanying drawings are illustrative and are merely intended to explain the disclosure rather than limit the disclosure.

As illustrated in <FIG>, an electronic device <NUM> includes a casing <NUM> and a display assembly <NUM> coupled with the casing <NUM>. The electronic device <NUM> may be a mobile phone, a tablet computer, a display, a notebook computer, a teller machine, a gate, a smart watch, a headset device, a game console, or the like. The following describes a mobile phone as an example of the electronic device <NUM>, and the electronic device <NUM> is not limited to a mobile phone.

The casing <NUM> is used for accommodating the display assembly <NUM>. That is, the casing <NUM> is used as a carrier for the display assembly <NUM>. As illustrated in <FIG>, the casing <NUM> includes a front casing <NUM>, and the display assembly <NUM> is coupled with the front casing <NUM> in a glue dispensing or adhesive manner. In addition, a power supply device, an imaging device, a communication device, and other functional modules of the electronic device <NUM> can also be received in the casing <NUM>, such that the casing <NUM> can provide dust-proof protection, anti-breaking protection, water-proof protection, and other protection for the functional modules.

As illustrated in <FIG> and <FIG>, the display assembly <NUM> includes a display module <NUM>, a capacitive fingerprint sensor film <NUM>, and a cover plate <NUM>. The capacitive fingerprint sensor film <NUM> is disposed between the cover plate <NUM> and the display module <NUM>. The capacitive fingerprint sensor film <NUM> covers a display surface of the display module <NUM> to sense a fingerprint of a finger in contact with the cover plate <NUM>.

In the display assembly <NUM> and the electronic device <NUM>, the capacitive fingerprint sensor film <NUM> covers the display surface <NUM>, such that full-screen fingerprint recognition can be achieved. Compared with local fingerprint recognition, the operation is more convenient. In addition, compared with optical fingerprint recognition, when the capacitive fingerprint sensor film <NUM> is used for fingerprint recognition, a relatively large camera is not needed, and only the capacitive fingerprint sensor film <NUM> is needed, such that the electronic device is thin and design of the electronic device <NUM> is simple.

In one example, the capacitive fingerprint sensor film <NUM> is a full-screen capacitive fingerprint sensor film. "Full-screen" refers to that the capacitive fingerprint sensor film <NUM> covers up to a predetermined percentage of the display surface <NUM>. For example, the capacitive fingerprint sensor film <NUM> covers up to <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, or <NUM>% of the display surface <NUM>. Moreover, the capacitive fingerprint sensor film <NUM> may be larger than the display surface <NUM> and cover up to <NUM>% of the display surface <NUM>. In this case, the capacitive fingerprint sensor film <NUM> covers the whole display surface <NUM> and extends beyond edges of the display surface <NUM>.

As illustrated in <FIG> and <FIG>, in at least one implementation, the display assembly <NUM> includes the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, the display module <NUM>, and an adhesive layer <NUM>.

In one example, the display assembly <NUM> has a light-exiting direction, and the display module <NUM>, the capacitive fingerprint sensor film <NUM>, and the cover plate <NUM> are stacked together in the light-exiting direction. In other words, the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, and the display module <NUM> are stacked together in a direction opposite the light-exiting direction. According to implementations, the light-exiting direction of the display assembly <NUM> is a light-exiting direction of the display module <NUM>.

The cover plate <NUM> can protect the capacitive fingerprint sensor film <NUM>. In at least one implementation, the cover plate <NUM> is made of at least one of Sapphire, glass, or a composite board, or made from at least one of Polyimide (PI) or Polyethylene terephthalate (PET), where the composite board is made from Polymethyl methacrylate (PMMA) and Polycarbonate (PC).

As one example, the cover plate <NUM> is made of Sapphire. Sapphire is a collective name for corundum gemstones of other colors other than ruby. Sapphire has high hardness, high transparency (about <NUM>%), low dielectric constant (<NUM>-<NUM>), and other advantages. When the cover plate <NUM> is made of Sapphire, the cover plate <NUM> has high hardness, high strength, a good sandpaper dropping effect (for example, the cover plate <NUM> is not susceptible to damage when the electronic device <NUM> falls to the cement ground from the <NUM> height), high scratch resistance, and the like. Generally, when the cover plate <NUM> is made of Sapphire, a thickness of the cover plate <NUM> ranges from <NUM> to <NUM>. That is, the thickness of the cover plate <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the cover plate <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or the like.

As another example, the cover plate <NUM> is made of glass. When the cover plate <NUM> is made of glass, the cover plate <NUM> has high strength and the cost of manufacturing the cover plate <NUM> is low. Generally, when the cover plate <NUM> is made of glass, the thickness of the cover plate <NUM> ranges from <NUM> to <NUM>. That is, the thickness of the cover plate <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the cover plate <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>.

As yet another example, the cover plate <NUM> is made from PI. When the cover plate <NUM> is made from PI, the cover plate <NUM> is flexible, and the cover plate <NUM> has a good sandpaper dropping effect. Generally, when the cover plate <NUM> is made from PI, the thickness of the cover plate <NUM> ranges from <NUM> to <NUM>. That is, the thickness of the cover plate <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the cover plate <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>.

As yet another example, the cover plate <NUM> is made from PET. When the cover plate <NUM> is made from PET, the cover plate <NUM> is flexible, and the cover plate <NUM> has a good sandpaper dropping effect. Generally, when the cover plate <NUM> is made from PET, a thickness of the cover plate <NUM> ranges from <NUM> to <NUM>. That is, the thickness of the cover plate <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the cover plate <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>.

As yet another example, the cover plate <NUM> is made of a composite board. The composite board is formed by PMMA and PC through welding, pressing, and other processes. Since PMMA has high scratch resistance and PC is good in toughness, when the cover plate <NUM> is made from a composite board, the cover plate <NUM> has high scratch resistance and good toughness. Generally, when the cover plate <NUM> is made from a composite board, the thickness of the cover plate <NUM> ranges from <NUM> to <NUM>. That is, the thickness of the cover plate <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the cover plate <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>, where a thickness of PMMA is about <NUM>.

It is to be understood that when the cover plate <NUM> is pressed by a user's finger, the electronic device <NUM> performs fingerprint recognition. As one example, if the cover plate <NUM> is relatively thick, the sensitivity of the capacitive fingerprint sensor film <NUM> may be affected, and the electronic device <NUM> is not thin. As another example, if the cover plate <NUM> is relatively thin, the cover plate <NUM> cannot protect the capacitive fingerprint sensor film <NUM> well when the cover plate <NUM> is pressed by the user's finger. Therefore, when the material and thickness of the cover plate <NUM> satisfy the conditions described in above implementations, the sensitivity of the capacitive fingerprint sensor film <NUM> can be ensured, the electronic device <NUM> can be made to be thin, and the cover plate <NUM> can protect the capacitive fingerprint sensor film <NUM> when the cover plate <NUM> is pressed by the user's finger.

As illustrated in <FIG>, the cover plate <NUM> has a light-exiting surface <NUM> and a back surface <NUM> opposite the light-exiting surface <NUM>. The back surface <NUM> of the cover plate <NUM> faces the capacitive fingerprint sensor film <NUM>, and the back surface <NUM> of the cover plate <NUM> is provided with an ink layer <NUM>. In one example, the ink layer <NUM> can be formed on the back surface <NUM> of the cover plate <NUM> through the screen printing process. The ink layer <NUM> has a high attenuation for visible light, for example, a attenuation rate can reach more than <NUM>%, such that a region covered by ink is invisible when the electronic device <NUM> is in normal use. For example, the capacitive fingerprint sensor film <NUM> and the display module <NUM> inside the electronic device <NUM> are invisible through the cover plate <NUM>, such that the appearance of the electronic device <NUM> is beautiful.

In one example, a thickness of the ink layer <NUM> is smaller than or equal to <NUM>. When the thickness of the ink layer <NUM> is smaller than or equal to <NUM>, the display assembly <NUM> is relatively thin, and accordingly the electronic device <NUM> is relatively thin.

Referring back to <FIG>, the capacitive fingerprint sensor film <NUM> is disposed between the cover plate <NUM> and the display module <NUM> and covers the display surface <NUM> of the display module <NUM> to sense a fingerprint of a finger in contact with the cover plate <NUM>. The capacitive fingerprint sensor film <NUM> is attached to the cover plate <NUM> (for example, the back surface <NUM> of the cover plate <NUM>) via the adhesive layer <NUM>. The capacitive fingerprint sensor film <NUM> has a light-exiting surface <NUM> and a back surface <NUM> opposite the light-exiting surface <NUM>. The light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM> faces the cover plate <NUM> (for example, the back surface <NUM> of the cover plate <NUM>). The back surface <NUM> of the capacitive fingerprint sensor film <NUM> faces the display module <NUM>.

In some implementations, the capacitive fingerprint sensor film <NUM> may cover the whole display surface <NUM> to implement a full-screen fingerprint recognition function. That is, the capacitive fingerprint sensor film <NUM> can cover up to <NUM>% of the display surface <NUM>, or the capacitive fingerprint sensor film <NUM> covers the whole display surface <NUM> and extends beyond the edges of the display surface <NUM>. Since the capacitive fingerprint sensor film <NUM> covers the whole display surface <NUM>, the fingerprint recognition can be achieved when any position rather than some specific positions of the display module <NUM> is pressed by the user, such that the operation is convenient. In addition, multiple positions of the display module <NUM> can be pressed synchronously or sequentially by multiple fingers of one user to perform fingerprint recognition for multiple fingerprints. Alternatively, multiple positions of the display module <NUM> can be pressed synchronously or sequentially by multiple fingers of multiple users to perform fingerprint recognition for multiple fingerprints, thereby enhancing the security level of encryption and unlocking of the electronic device <NUM>.

As illustrated in <FIG>, the capacitive fingerprint sensor film <NUM> covers the whole display surface <NUM> (i.e., the capacitive fingerprint sensor film <NUM> covers up to <NUM>% of the display surface <NUM>). In this case, edges of the capacitive fingerprint sensor film <NUM> and the edges of the display module <NUM> are aligned, which can be beneficial for ensuring the stability of the coupling between the capacitive fingerprint sensor film <NUM> and the display module <NUM>. Furthermore, a capacitive fingerprint recognition function of the whole display module <NUM> can be achieved by the capacitive fingerprint sensor film <NUM> having a small area. As illustrated in <FIG>, the capacitive fingerprint sensor film <NUM> covers the whole display surface <NUM> and extends beyond the edges of the display surface <NUM> (i.e., the capacitive fingerprint sensor film <NUM> has a size larger than the display surface <NUM> and fully covers the display surface <NUM>), to ensure the reliability of the fingerprint recognition at the edges of the display module <NUM>.

In one example, the thickness of the capacitive fingerprint sensor film <NUM> is about <NUM>. The capacitive fingerprint sensor film <NUM> is made of glass or made from PI, and a sensor substrate <NUM> described below is also made of glass or made from PI. A circuit of the capacitive fingerprint sensor film <NUM> is made from at least one of metal, Indium tin oxide (ITO), or Nano silver paste, and a sensor circuit layer <NUM> described below is also made from at least one of metal, ITO, or Nano silver paste. When the capacitive fingerprint sensor film <NUM> is made of glass or made from PI, the circuit of the capacitive fingerprint sensor film <NUM> can be made from any of the materials for the circuit of the capacitive fingerprint sensor film <NUM>. For example, when the capacitive fingerprint sensor film <NUM> is made of glass, the circuit of the capacitive fingerprint sensor film <NUM> is made of metal. For another example, the capacitive fingerprint sensor film <NUM> is made of glass, and the circuit of the capacitive fingerprint sensor film <NUM> is made from ITO. For yet another example, the capacitive fingerprint sensor film <NUM> is made of glass, and the circuit of the capacitive fingerprint sensor film <NUM> is made from Nano silver paste. For yet another example, the capacitive fingerprint sensor film <NUM> is made from PI, and the circuit of the capacitive fingerprint sensor film <NUM> is made of metal. For yet another example, the capacitive fingerprint sensor film <NUM> is made from PI, and the circuit of the capacitive fingerprint sensor film <NUM> is made from ITO. For yet another example, the capacitive fingerprint sensor film <NUM> is made from PI, and the circuit of the capacitive fingerprint sensor film <NUM> is made from Nano silver paste. The disclosure is not limited thereto.

As illustrated in <FIG>, the capacitive fingerprint sensor film <NUM> may include pixel sensors <NUM>, a sensor board <NUM>, pixel amplifiers <NUM>, output lines <NUM>, and a power supply <NUM>. The pixel sensors <NUM> are disposed on the sensor board <NUM>. The pixel sensors <NUM> can be arranged in an array. In one example, the capacitive fingerprint sensor film <NUM> includes <NUM> * <NUM> pixel sensors <NUM>, which can be miniature pixel sensors. The pixel sensors <NUM> are arranged on one side of the sensor board <NUM>, and the pixel amplifiers <NUM> and the output lines <NUM> are arranged on the other side of the sensor board <NUM>. The pixel amplifier <NUM> is configured to amplify signal of the pixel sensor <NUM> and output the signal amplified through the output line <NUM>. Multiple output lines <NUM> may be included, and each pixel sensor <NUM> corresponds to one pixel amplifier <NUM> and one output line <NUM> in terms of position. The power supply <NUM> is coupled with the sensor board <NUM> and used for applying a voltage to form an electric field. The power supply <NUM> may be disposed on the sensor board <NUM>, or may not be disposed on the sensor board <NUM>. When the power supply <NUM> is disposed on the sensor board <NUM>, the power supply <NUM> is coupled with the sensor board <NUM> in the welding or the lamination manner. The capacitive fingerprint sensor film <NUM> further includes a semiconductor substrate (not illustrated in the figures). The semiconductor substrate faces the sensor board <NUM>. The semiconductor substrate, the pixel amplifier <NUM>, and the output circuit <NUM> are arranged on the same side of the sensor board <NUM>, and the pixel amplifier <NUM> and the output circuit <NUM> are both arranged on the semiconductor substrate. One side of the sensor board <NUM> where the pixel sensor <NUM> is disposed may be determined as the light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM>, and the other side of the sensor board <NUM> where the semiconductor substrate is disposed may be determined as the back surface <NUM> of the capacitive fingerprint sensor film <NUM>. It is worth noting that the structure of the capacitive fingerprint sensor film <NUM> in <FIG> is merely illustrated as an example, and the capacitive fingerprint sensor film <NUM> may have other structures in other implementations.

When the cover plate <NUM> is pressed by the user's finger, the capacitive fingerprint sensor film <NUM> is pressed, the pixel sensor <NUM> disposed under the pressed part of the capacitive fingerprint sensor film <NUM> forms an electrode plate of a capacitor, and skin on the finger constitutes the other electrode plate of the capacitor, and thus the electronic device <NUM> performs fingerprint recognition. Since the finger has concave points (i.e., valleys of the fingerprint) and convex points (i.e., ridges of the fingerprint), a distance between a convex point and a pixel sensor <NUM> facing the convex point is not the same as that between a concave point and a pixel sensor <NUM> facing the concave point, and thus different capacitance values may be formed at the convex points and the concave points. As such, a fingerprint image can be obtained according to the capacitance values.

The capacitive fingerprint sensor film <NUM> may obtain a fingerprint image according to the capacitance values, and fingerprint recognition can be performed according to the fingerprint image. Compared with optical fingerprint recognition for the capacitance fingerprint recognition, the recognition speed is higher, the sensitivity is higher, and the fingerprint image may be collected without participation of light from the display module <NUM>. In addition, fingerprint recognition can be performed in dark scenes, and thus a LCM can be adopted, such that the cost may be reduced.

As illustrated in <FIG>, the display module <NUM> is used for displaying pictures, videos, characters, and other information. The display module <NUM> is attached to the capacitive fingerprint sensor film <NUM> (for example, the back surface <NUM> of the capacitive fingerprint sensor film <NUM>) via the adhesive layer <NUM>. The display module <NUM> has a display surface <NUM> and a back surface <NUM> opposite the display surface <NUM>. The display surface <NUM> of the display module <NUM> faces the capacitive fingerprint sensor film <NUM> (for example, the back surface <NUM> of the capacitive fingerprint sensor film <NUM>). According to implementations, when the capacitive fingerprint sensor film <NUM> covers up to just <NUM>% of the whole display surface <NUM>, an area of the back surface <NUM> of the capacitive fingerprint sensor film <NUM> is equal to that of the display surface <NUM> (as illustrated in <FIG>). In other words, a length of the back surface <NUM> of the capacitive fingerprint sensor film <NUM> is equal to that of the display surface <NUM>, and a width of the back surface <NUM> of the capacitive fingerprint sensor film <NUM> is equal to that of the display surface <NUM>. When the capacitive fingerprint sensor film <NUM> covers the whole display surface and extends beyond the edges of the display surface <NUM>, an area of the back surface <NUM> of the capacitive fingerprint sensor film <NUM> is larger than that of the display surface <NUM> (as illustrated in <FIG>). For example, a length of the back surface <NUM> of the capacitive fingerprint sensor film <NUM> is larger than that of the display surface <NUM>, and a width of the back surface <NUM> of the capacitive fingerprint sensor film <NUM> is equal to that of the display surface <NUM>. For another example, a length of the back surface <NUM> of the capacitive fingerprint sensor film <NUM> is equal to that of the display surface <NUM>, and a width of the back surface <NUM> of the capacitive fingerprint sensor film <NUM> is larger than that of the display surface <NUM>. For yet another example, a length of the back surface <NUM> of the capacitive fingerprint sensor film <NUM> is larger than that of the display surface <NUM>, and a width of the back surface <NUM> of the capacitive fingerprint sensor film <NUM> is larger than that of the display surface <NUM>.

In some examples, the display module <NUM> is a rigid screen or a flexible screen. As one example, when the display module <NUM> is a rigid screen, the capacitive fingerprint sensor film <NUM> is made of glass, such that the cost may be reduced, and the circuit of the capacitive fingerprint sensor film <NUM> is made from at least one of metal, ITO, or Nano silver paste. As another example, when the display module <NUM> is a flexible screen, the capacitive fingerprint sensor film <NUM> is made from PI to form a flexible sensor, and the circuit of the capacitive fingerprint sensor film <NUM> is made from ITO or Nano silver paste to form a flexible circuit. It should be noted that, when the display module <NUM> is a rigid screen, the capacitive fingerprint sensor film <NUM> can be made from PI, and the disclosure is not limited thereto.

As illustrated in <FIG>, the display module <NUM> is a liquid crystal display module (LCM) <NUM> or an organic light-emitting diode (OLED) display <NUM>. Since the capacitive fingerprint sensor film <NUM> performs fingerprint recognition according to the capacitance values and the fingerprint image is collected without participation of light from the display module <NUM>, the capacitive fingerprint recognition function can be achieved under a condition that the display module <NUM> is the LCM <NUM>, the OLED display <NUM>, or other display screens. That is, the display module <NUM> is not limited to the OLED display <NUM>.

As illustrated in <FIG>, when the display module <NUM> is the LCM <NUM>, it is beneficial for reducing the cost of the electronic device <NUM> (since LCM is usually cheaper than OLED for displays). The LCM <NUM> may include a backlight module <NUM>, a lower polarizer <NUM>, a thin film transistor (TFT) substrate <NUM>, a liquid crystal layer <NUM>, a color filter <NUM>, and an upper polarizer <NUM> that are sequentially stacked together in the light-exiting direction of the display assembly <NUM>. A surface of the upper polarizer <NUM> away from the color filter <NUM> is regarded as the display surface <NUM>, and a surface of the backlight module <NUM> away from the lower polarizer <NUM> is regarded as the back surface <NUM> of the display module <NUM>. The LCM <NUM> emits light through the backlight module <NUM>. The light sequentially passes through the lower polarizer <NUM>, the TFT substrate <NUM>, the liquid crystal layer <NUM>, the color filter <NUM>, the upper polarizer <NUM>, the capacitive fingerprint sensor film <NUM>, and the cover plate <NUM> to reach the outside, and is then perceived by the user, so that the user can view the information displayed by the display module <NUM>.

As illustrated in <FIG>, when the display module <NUM> is an OLED display <NUM>, a curved screen or other screens may be formed to provide various choices for the user. The OLED display <NUM> may include a glass TFT substrate <NUM>, an OLED <NUM>, a encapsulation glass <NUM>, and an OLED polarizer <NUM> that are sequentially stacked together in the light-exiting direction of the display assembly <NUM>. A surface of the OLED polarizer <NUM> away from the encapsulation glass <NUM> is regarded as the display surface <NUM>, and a surface of the glass TFT substrate <NUM> away from the OLED <NUM> is regarded as the back surface <NUM> of the display module <NUM>. The OLED display <NUM> emits light through the OLED <NUM>. The light sequentially passes through the encapsulation glass <NUM>, the OLED polarizer <NUM>, the capacitive fingerprint sensor film <NUM>, and the cover plate <NUM> to reach the outside, and is then perceived by the user, so that the user can view the information displayed by the display module <NUM>.

As illustrated in <FIG>, the display module <NUM> may have a touch function in addition to the display function. In this case, the display module <NUM> further includes a touch sensor <NUM>. In <FIG>, the display module <NUM> is the LCM <NUM>, and the backlight module <NUM>, the lower polarizer <NUM>, the TFT substrate <NUM>, the liquid crystal layer <NUM>, the color filter <NUM>, and the upper polarizer <NUM> (or, a polarizer <NUM> described below) form the display module, and the touch sensor <NUM> forms the touch module. In <FIG>, the display module <NUM> is the OLED display <NUM>, and thus the glass TFT substrate <NUM>, the OLED <NUM>, the encapsulation glass <NUM>, and the OLED polarizer <NUM> (or, the polarizer <NUM> described below) form the display module, and the touch sensor <NUM> forms the touch module. As one example, the display module may be independent of the touch module, and the two modules are integrally formed through a back-end lamination process. As another example, as illustrated in <FIG>, the touch module may be embedded in the display module. For instance, in <FIG>, the touch sensor <NUM> is disposed between the color filter <NUM> and the liquid crystal layer <NUM>. For another instance, the touch sensor <NUM> is formed by forming elements such as a transparent electrode on a surface of the color filter <NUM> facing the liquid crystal layer <NUM>. The touch sensor <NUM> may be a resistive touch sensor, a capacitive touch sensor, an infrared touch sensor, an acoustic wave touch sensor, an optical imaging touch sensor, an electromagnetic induction touch sensor, and the like, which are not limited herein.

Referring back to <FIG>, the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, and the display module <NUM> are attached via the adhesive layer <NUM>. Since the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, and the display module <NUM> are attached via the adhesive layer <NUM>, it is possible to ensure the structural strength of the display assembly <NUM> and the reliability of the fingerprint recognition. When the display module <NUM> is the LCM <NUM>, the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, and the upper polarizer <NUM> are attached via the adhesive layer <NUM>. When the display module <NUM> is the OLED display <NUM>, the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, and the OLED polarizer <NUM> are attached via the adhesive layer <NUM>.

The adhesive layer <NUM> being used for attaching the cover plate <NUM> and the capacitive fingerprint sensor film <NUM> to the display module <NUM> means that the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, and the display module <NUM> are attached together via the adhesive layer <NUM>. For example, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM>, and the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>. In this case, the adhesive layer <NUM> includes two adhesive sub-layers, the cover plate <NUM> being attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM> refers to that the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via one of the two adhesive sub-layers, and the capacitive fingerprint sensor film <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the other of the two adhesive sub-layers. For another example, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM>, and the cover plate <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>. In this case, the adhesive layer <NUM> includes two adhesive sub-layers, the cover plate <NUM> being attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM> refers to that the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via one of the two adhesive sub-layers, and the cover plate <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the cover plate <NUM> is attached to the display module <NUM> via the other of the two adhesive sub-layers. For yet another example, the cover plate <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>, and the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>. In this case, the adhesive layer <NUM> includes two adhesive sub-layers, the cover plate <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the cover plate <NUM> is attached to the display module <NUM> via one of the two adhesive sub-layers, and the capacitive fingerprint sensor film <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the other of the two adhesive sub-layers. For yet another example, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM>, the cover plate <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>, and the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>. In this case, the adhesive layer <NUM> includes three adhesive sub-layers, the cover plate <NUM> being attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM> refers to that the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via a first adhesive sub-layer, the cover plate <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the cover plate <NUM> is attached to the display module <NUM> via a second adhesive sub-layer, and the capacitive fingerprint sensor film <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via a third adhesive sub-layer.

In one example, the adhesive layer <NUM> is an optical adhesive layer. In at least one implementation, the adhesive layer <NUM> is made from at least one of an optically clear adhesive (OCA), a PolyVinyl Butyral (PVB) film, or a Die attach film (DAF). That is, the adhesive layer <NUM> may be formed by an OCA, a PVB film, or a DAF.

As illustrated in <FIG>, in at least one implementation, the adhesive layer <NUM> includes a first optical adhesive layer <NUM> and a second optical adhesive layer <NUM>. The cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM>. The back surface <NUM> of the cover plate <NUM> is attached to the light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM>. The capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM>. The back surface <NUM> of the capacitive fingerprint sensor film <NUM> is attached to the display surface <NUM> via the second optical adhesive layer <NUM>. According to implementations, the cover plate <NUM>, the first optical adhesive layer <NUM>, the capacitive fingerprint sensor film <NUM>, the second optical adhesive layer <NUM>, and the display module <NUM> are sequentially stacked together in the direction opposite the light-exiting direction of the display assembly <NUM>.

In at least one implementation, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM> in full lamination (also known as direct bonding).

The cover plate <NUM> and the capacitive fingerprint sensor film <NUM> being attached in full lamination refers to that the cover plate <NUM> and the capacitive fingerprint sensor film <NUM> are attached seamlessly. That is, the first optical adhesive layer <NUM> covers the whole surface of the cover plate <NUM> or the whole surface of the capacitive fingerprint sensor film <NUM>, and there is no gap between the cover plate <NUM> and the capacitive fingerprint sensor film <NUM>. Since the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM> in full lamination, the cover plate <NUM> can be firmly attached to the capacitive fingerprint sensor film <NUM>, and the position of the capacitive fingerprint sensor film <NUM> relative to the cover plate <NUM> does not vary with time, which is beneficial to improving the reliability of fingerprint recognition performed by the capacitive fingerprint sensor film <NUM>. Furthermore, it is possible to reduce the chance that dust and moisture enter the cover plate <NUM> and the capacitive fingerprint sensor film <NUM>.

In at least one implementation, the first optical adhesive layer <NUM> is made from at least one of an OCA, a PVB film, or a DAF. When the first optical adhesive layer <NUM> is made from an OCA, the first optical adhesive layer <NUM> is soft, the lamination process is simple, and when the cover plate <NUM> is pressed by the user's finger, the first optical adhesive lay <NUM> may have a certain buffer effect on the cover plate <NUM> and the capacitive fingerprint sensor film <NUM>. When the first optical adhesive layer <NUM> is made from a PVB film, the first optical adhesive layer <NUM> has a relatively high stickiness, which is conducive to ensuring the structural stability between the cover plate <NUM> and the capacitive fingerprint sensor film <NUM>. When the first optical adhesive layer <NUM> is made from a DAF, it is possible to reduce bubbles produced in the lamination process, and improve the lamination efficiency, thereby enhancing the flatness of the coupling between the cover plate <NUM> and the capacitive fingerprint sensor film <NUM>.

When the first optical adhesive layer <NUM> is made from at least one of an OCA, a PVB film, or a DAF, a thickness of the first optical adhesive layer <NUM> ranges from <NUM> to <NUM>. That is, the thickness of the first optical adhesive layer <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the first optical adhesive layer <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or the like. For another example, the thickness of the first optical adhesive layer <NUM> is <NUM>, which is beneficial to ensuring the stability of the coupling between the cover plate <NUM> and the capacitive fingerprint sensor film <NUM>, and reducing the thickness of the electronic device <NUM>.

In at least one implementation, the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM> in full lamination or in edge lamination (also known as air bonding).

The capacitive fingerprint sensor film <NUM> and the display module <NUM> being attached in full lamination refers to that the capacitive fingerprint sensor film <NUM> and the display module <NUM> are attached seamlessly. That is, the second optical adhesive layer <NUM> covers the whole surface of the capacitive fingerprint sensor film <NUM> or the whole surface of the display module <NUM>, and there is no gap between the capacitive fingerprint sensor film <NUM> and the display module <NUM>. Since the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM> in full lamination, the capacitive fingerprint sensor film <NUM> can be firmly attached to the display module <NUM>, and the position of the display module <NUM> relative to the capacitive fingerprint sensor film <NUM> does not vary with time, which is beneficial to enhancing the structural consistency between a display region and a fingerprint recognition region. Furthermore, it is possible to reduce the chance that dust and moisture enter the capacitive fingerprint sensor film <NUM> and the display module <NUM>.

As illustrated in <FIG>, the capacitive fingerprint sensor film <NUM> and the display module <NUM> being attached in edge lamination refers to that a side or an edge of the capacitive fingerprint sensor film <NUM> is attached to a side or an edge of the display module <NUM> via the second optical adhesive layer <NUM>. That is, the second optical adhesive layer <NUM> is coated on the periphery of the capacitive fingerprint sensor film <NUM> or the display module <NUM> (e.g., around the capacitive fingerprint sensor film <NUM> or the display module <NUM>), and there is a gap between the capacitive fingerprint sensor film <NUM> and the display module <NUM>. It should be noted that the gap can be filled with some transparent materials (such as PET chipper than optical adhesive), so as to enhance the structural stability and reduce the possibility that dust and moisture enter the capacitive fingerprint sensor film <NUM> and the display module <NUM>. When the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM> in edge lamination, the second optical adhesive layer <NUM> is relatively small in size, and thus cost is reduced and the lamination efficiency is improved. In addition, if the capacitive fingerprint sensor film <NUM> is damaged, the capacitive fingerprint sensor film <NUM> can be easily detached from the display module <NUM> and replaced with another capacitive fingerprint sensor film, and thus there is no need to replace both the capacitive fingerprint sensor film <NUM> and the display module <NUM>. On the other hand, if the display module <NUM> is damaged, the display module <NUM> can be easily detached from the capacitive fingerprint sensor film <NUM> and replaced with another display module, and thus there is no need to replace both the capacitive fingerprint sensor film <NUM> and the display module <NUM>.

In at least one implementation, the second optical adhesive layer <NUM> is made from at least one of an OCA, a PVB film, or a DAF. As one example, when the second optical adhesive layer <NUM> is made from an OCA, the second optical adhesive layer <NUM> is soft, the lamination process is simple, and when the cover plate <NUM> is pressed by the user's finger, the second optical adhesive layer <NUM> can reduce impact on the capacitive fingerprint sensor film <NUM> and the display module <NUM>. As another example, when the second optical adhesive layer <NUM> is made from a PVB film, the second optical adhesive layer <NUM> has a relatively high stickiness, which is conducive to ensuring the structural stability between the capacitive fingerprint sensor film <NUM> and the display module <NUM>. As yet another example, when the second optical adhesive layer <NUM> is made from a DAF, it is possible to reduce bubbles produced in the lamination process, and improve the lamination efficiency, thereby enhancing the flatness of the coupling between the capacitive fingerprint sensor film <NUM> and the display module <NUM>.

When the second optical adhesive layer <NUM> is made from at least one of an OCA, a PVB film, or a DAF, a thickness of the second optical adhesive layer <NUM> ranges from <NUM> to <NUM>. That is, the thickness of the second optical adhesive layer <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the second optical adhesive layer <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or the like. For another example, the thickness of the second optical adhesive layer <NUM> is <NUM>, and thus not only the stability of the coupling between the capacitive fingerprint sensor film <NUM> and the display module <NUM> can be ensured, but also the electronic device <NUM> can be made to be relatively thin.

It should be noted that the first optical adhesive layer <NUM> and the second optical adhesive layer <NUM> can be made from a same material or different materials. For example, when the first optical adhesive layer <NUM> and the second optical adhesive layer <NUM> are made from the same material, both the first optical adhesive layer <NUM> and the second optical adhesive layer <NUM> may be made from an OCA, a PVB film, or a DAF. For another example, when the first optical adhesive layer <NUM> and the second optical adhesive layer <NUM> are made from different materials, the first optical adhesive layer <NUM> is made from an OCA, and the second optical adhesive layer <NUM> is made from a PVB film; or the first optical adhesive layer <NUM> is made from a PVB film, and the second optical adhesive layer <NUM> is made from a DAF; or the first optical adhesive layer <NUM> is made from a DAF, and the second optical adhesive layer <NUM> is made from an OCA, which are not enumerated herein. In addition, the thickness of the first optical adhesive layer <NUM> and the thickness of the second optical adhesive layer <NUM> may be the same or different. For example, if the thickness of the first optical adhesive layer <NUM> is the same as that of the second optical adhesive layer <NUM>, the thickness of the first optical adhesive layer <NUM> and the thickness of the second optical adhesive layer <NUM> are both <NUM>, <NUM>, or <NUM>. For another example, if the thickness of the first optical adhesive layer <NUM> is different from that of the second optical adhesive layer <NUM>, the thickness of the first optical adhesive layer <NUM> is <NUM>, and the thickness of the second optical adhesive layer <NUM> is <NUM>; or the thickness of the first optical adhesive layer <NUM> is <NUM>, and the thickness of the second optical adhesive layer <NUM> is <NUM>; or the thickness of the first optical adhesive layer <NUM> is <NUM>, and the thickness of the second optical adhesive layer <NUM> is <NUM>, which are not enumerated herein.

As illustrated in <FIG>, in at least one implementation, the adhesive layer <NUM> includes a first optical adhesive layer <NUM> and a second optical adhesive layer <NUM>. The cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM>. The back surface <NUM> of the cover plate <NUM> is attached to the light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM>. The cover plate <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM>. The back surface <NUM> of the cover plate <NUM> is attached to the display surface <NUM> via the second optical adhesive layer <NUM>. According to implementations, in a central region of the cover plate <NUM>, the cover plate <NUM>, the first optical adhesive layer <NUM>, the capacitive fingerprint sensor film <NUM>, and the display module <NUM> are sequentially stacked together in the direction opposite the light-exiting direction of the display assembly <NUM>. In the edge region of the cover plate <NUM>, the cover plate <NUM>, the second optical adhesive layer <NUM>, and the display module <NUM> are sequentially stacked together in the direction opposite the light-exiting direction of the display assembly <NUM>.

Similar to foregoing implementations, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM> in full lamination. The first optical adhesive layer <NUM> is made from at least one of an OCA, a PVB film, or a DAF. When the first optical adhesive layer <NUM> is made from an OCA, a PVB film, or a DAF, a thickness of the first optical adhesive layer <NUM> ranges from <NUM> to <NUM>, which are not described in detail herein.

In at least one implementation, the cover plate <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM> in edge lamination.

The cover plate <NUM> and the display module <NUM> being attached in edge lamination refers to that a side or an edge of the cover plate <NUM> is attached to a side or an edge of the display module <NUM> via the second optical adhesive layer <NUM>. That is, the second optical adhesive layer <NUM> is coated on the periphery of the cover plate <NUM> or the display module <NUM> (around the cover plate <NUM> or the display module <NUM>), and there is an gap between the cover plate <NUM> and the display module <NUM> (as illustrated in <FIG>). It should be noted that the gap may be filled with some transparent materials (such as PET chipper than optical adhesive), so as to enhance structural stability and reduce the possibility that dust and moisture enter the cover plate <NUM> and the display module <NUM>. Alternatively, the gap can also be formed on the periphery of the second optical adhesive layer <NUM> instead of being formed between the second optical adhesive layer <NUM> and the first optical adhesive layer <NUM> as illustrated in <FIG>. In this case, electronic elements or circuit wires can be disposed in the gap to improve space utilization. Alternatively, since the first optical adhesive layer <NUM> and the capacitive fingerprint sensor film <NUM> are disposed between the cover plate <NUM> and the display module <NUM>, the first optical adhesive layer <NUM> and the capacitive fingerprint sensor film <NUM> just fill the gap between the cover plate <NUM> and the display module <NUM>, such that there is no gap between the cover plate <NUM> and the display module <NUM> (as illustrated in <FIG>). As such, when the cover plate <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM> in edge lamination, the second optical adhesive layer <NUM> is relatively small in size, and thus cost is reduced and the lamination efficiency is improved. In addition, the thickness of the second optical adhesive layer <NUM> may be equal to or approximately equal to a sum of thicknesses of the first optical adhesive layer <NUM> and the capacitive fingerprint sensor film <NUM>. Compared with a scenario in which the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM> and the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM> (as illustrated in <FIG>), in <FIG>, the thickness of the display assembly <NUM> is equal to a sum of thicknesses of the cover plate <NUM>, the first optical adhesive layer <NUM>, the capacitive fingerprint sensor film <NUM>, and the display module <NUM>, that is, the second adhesive layer <NUM> does not make a contribution to the thickness of the display assembly <NUM>, and thus the thickness of the display assembly <NUM> is reduced and the electronic device <NUM> is relatively thin. Furthermore, if the cover plate <NUM> is damaged, the cover plate <NUM> can be easily detached from the display module <NUM> and replaced with another cover plate, and thus there is no need to replace both the cover plate <NUM> and the display module <NUM>. Alternatively, if the display module <NUM> is damaged, the display module <NUM> can be easily detached from the cover plate <NUM> and replaced with another display module, and thus there is no need to replace both the display module <NUM> and the cover plate <NUM>.

Similar to the implementations illustrated in <FIG>, the second optical adhesive layer <NUM> is made from at least one of an OCA, a PVB film, or a DAF. When the second optical adhesive layer <NUM> is made from an OCA, a PVB film, or a DAF, a thickness of the second optical adhesive layer <NUM> ranges from <NUM> to <NUM>. The first optical adhesive layer <NUM> and the second optical adhesive layer <NUM> can be made from a same material or different materials.

As illustrated in <FIG>, the display assembly <NUM> further includes a reinforcing layer <NUM>. The reinforcing layer <NUM> is disposed between the capacitive fingerprint sensor film <NUM> and the display module <NUM>. Specifically, the reinforcing layer <NUM> is disposed between the back surface <NUM> of the capacitive fingerprint sensor film <NUM> and display surface <NUM>. In one example, the reinforcing layer <NUM> has a light-exiting surface <NUM> and a back surface <NUM> opposite the light-exiting surface <NUM>. The light-exiting surface <NUM> of the reinforcing layer <NUM> faces the back surface <NUM> of the capacitive fingerprint sensor film <NUM>. The back surface <NUM> of the reinforcing layer <NUM> faces the display surfaces <NUM>.

The reinforcing layer <NUM> and the cover plate <NUM> form a double-layer cover plate. When the thickness of the cover plate <NUM> is only <NUM> or less than <NUM>, the reinforcing layer <NUM> can enhance the strength of the display assembly <NUM>, and reduce the chance that the capacitive fingerprint sensor film <NUM> cannot work normally due to collision or impact during use of the electronic device <NUM>.

The reinforcing layer <NUM> can be made of at least one of Sapphire, glass, or a composite board, or made from at least one of PI or PET. For the explanation of sapphire, glass, PI, PET, and the composite board, reference may be made to the foregoing implementations, which are not described in detail herein. When the reinforcing layer <NUM> is made of at least one of Sapphire, glass, or a composite board, or made from at least one of PI or PET, a thickness of the reinforcing layer <NUM> ranges from <NUM> to <NUM>. That is, the thickness of the reinforcing layer <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the reinforcing layer <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or the like.

When the display assembly <NUM> includes the reinforcing layer <NUM>, the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, the reinforcing layer <NUM>, and the display module <NUM> are attached via the adhesive layer <NUM>. The adhesive layer <NUM> being used for attaching the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, and the reinforcing layer <NUM> to the display module <NUM> means that the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, the reinforcing layer <NUM>, and the display module <NUM> are attached together via the adhesive layer <NUM>. For example, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM>, the capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via the adhesive layer <NUM>, and the reinforcing layer <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>. In this case, the adhesive layer <NUM> includes three adhesive sub-layers. The cover plate <NUM> being attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM> refers to that the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via a first adhesive sub-layer. The capacitive fingerprint sensor film <NUM> being attached to the reinforcing layer <NUM> via the adhesive layer <NUM> refers to that the capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via a second adhesive sub-layer. The reinforcing layer <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the reinforcing layer <NUM> is attached to the display module <NUM> via a third adhesive sub-layer. For another example, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM>, the capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via the adhesive layer <NUM>, and the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>. In this case, the adhesive layer <NUM> includes three adhesive sub-layers. The cover plate <NUM> being attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM> refers to that the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via a first adhesive sub-layer. The capacitive fingerprint sensor film <NUM> being attached to the reinforcing layer <NUM> via the adhesive layer <NUM> refers to that the capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> a second adhesive sub-layer. The capacitive fingerprint sensor film <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via a third adhesive sub-layer. For yet another example, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM>, the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>, and the reinforcing layer <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>. In this case, the adhesive layer <NUM> includes three adhesive sub-layers. The cover plate <NUM> being attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM> refers to that the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via a first adhesive sub-layer. The capacitive fingerprint sensor film <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via a second adhesive sub-layer. The reinforcing layer <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the reinforcing layer <NUM> is attached to the display module <NUM> via a third adhesive sub-layer. For yet another example, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM>, the capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via the adhesive layer <NUM>, the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>, and the reinforcing layer <NUM> is attached to the display module <NUM> via the adhesive layer <NUM>. In this case, the adhesive layer <NUM> includes four adhesive sub-layers. The cover plate <NUM> being attached to the capacitive fingerprint sensor film <NUM> via the adhesive layer <NUM> refers to that the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via a first adhesive sub-layer. The capacitive fingerprint sensor film <NUM> being attached to the reinforcing layer <NUM> via the adhesive layer <NUM> refers to that the capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via a second adhesive sub-layer. The capacitive fingerprint sensor film <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via a third adhesive sub-layer. The reinforcing layer <NUM> being attached to the display module <NUM> via the adhesive layer <NUM> refers to that the reinforcing layer <NUM> is attached to the display module <NUM> via a fourth adhesive sub-layer. The disclosure is not limited thereto.

As illustrated in <FIG>, in at least one implementation, the adhesive layer <NUM> includes the first optical adhesive layer <NUM>, a third optical adhesive layer <NUM>, and a fourth optical adhesive layer <NUM>. The cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM>. The back surface <NUM> of the cover plate <NUM> is attached to the light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM>. The capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via the third optical adhesive layer <NUM>. The back surface <NUM> of the capacitive fingerprint sensor film <NUM> is attached to the light-exiting surface <NUM> of the reinforcing layer <NUM> via the third optical adhesive layer <NUM>. The reinforcing layer <NUM> is attached to the display module <NUM> via the fourth optical adhesive layer <NUM>. The back surface <NUM> of the reinforcing layer <NUM> is attached to the display surface <NUM> via the fourth optical adhesive layer <NUM>. According to implementations, the cover plate <NUM>, the first optical adhesive layer <NUM>, the capacitive fingerprint sensor film <NUM>, the third optical adhesive layer <NUM>, the reinforcing layer <NUM>, the fourth optical adhesive layer <NUM>, and the display module <NUM> are sequentially stacked together in the direction opposite the light-exiting direction of the display assembly <NUM>. That is, the second optical adhesive layer <NUM> described in the foregoing implementations is replaced by the third optical adhesive layer <NUM> and the fourth optical adhesive layer <NUM>, and furthermore the reinforcing layer <NUM> is sandwiched between the capacitive fingerprint sensor film <NUM> and the display module <NUM>.

The capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via the third optical adhesive layer <NUM> in full lamination or in edge lamination.

As illustrated in <FIG>, the capacitive fingerprint sensor film <NUM> and the reinforcing layer <NUM> being attached in full lamination refers to that the capacitive fingerprint sensor film <NUM> and the reinforcing layer <NUM> are attached seamlessly. That is, the first optical adhesive layer <NUM> covers the whole surface of the capacitive fingerprint sensor film <NUM> or the whole surface of the reinforcing layer <NUM>, and there is no gap between the capacitive fingerprint sensor film <NUM> and the reinforcing layer <NUM>. When the capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via the third optical adhesive layer <NUM> in full lamination, the capacitive fingerprint sensor film <NUM> can be firmly attached to the reinforcing layer <NUM>, and the reinforcing layer <NUM> has a high reinforcement effect. Furthermore, it is possible to reduce the chance that dust and moisture from enter the capacitive fingerprint sensor film <NUM> and the reinforcing layer <NUM>.

As illustrated in <FIG>, the capacitive fingerprint sensor film <NUM> and the reinforcing layer <NUM> being attached in edge lamination refers to that a side or an edge of the capacitive fingerprint sensor film <NUM> is attached to a side or an edge of the reinforcing layer <NUM> via the third optical adhesive layer <NUM>. That is, the third optical adhesive layer <NUM> is coated on the periphery of the capacitive fingerprint sensor film <NUM> or the reinforcing layer <NUM> (around the capacitive fingerprint sensor film <NUM> or the reinforcing layer <NUM>), and there is a gap between the capacitive fingerprint sensor film <NUM> and the reinforcing layer <NUM>. It should be noted that, the gap may be filled with some transparent materials (such as PET chipper than optical adhesive), so as to enhance structural stability and reduce the possibility that dust and moisture enter the capacitive fingerprint sensor film <NUM> and the reinforcing layer <NUM>. Furthermore, when the capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via the third optical adhesive layer <NUM> in edge lamination, the third optical adhesive layer <NUM> is relatively small in size, and thus cost is reduced, and the lamination efficiency is improved.

The third optical adhesive layer <NUM> is made from at least one of an OCA, a PVB film, or a DAF. As one example, when the third optical adhesive layer <NUM> is made from an OCA, the third optical adhesive layer <NUM> is soft, and the lamination process is simple. In addition, when the cover plate <NUM> is pressed by the user's finger, the third optical adhesive layer <NUM> can reduce impact on the capacitive fingerprint sensor film <NUM>. As another example, when the third optical adhesive layer <NUM> is made from a PVB film, the third optical adhesive layer <NUM> has a relatively high stickiness, which is conducive to ensuring the structural stability between the capacitive fingerprint sensor film <NUM> and the reinforcing layer <NUM>. As yet another example, when the third optical adhesive layer <NUM> is made from a DAF, it is possible to reduce bubbles produced in the lamination process and improve the lamination efficiency, thereby enhancing the flatness of the coupling between the capacitive fingerprint sensor film <NUM> and the reinforcing layer <NUM>.

When the third optical adhesive layer <NUM> is made from at least one of an OCA, a PVB film, or a DAF, a thickness of the third optical adhesive layer <NUM> rangers from <NUM> to <NUM>. That is, the thickness of the third optical adhesive layer <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the third optical adhesive layer <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or the like. For another example, the thickness of the third optical adhesive layer <NUM> is <NUM>, and thus not only the stability of the coupling between the capacitive fingerprint sensor film <NUM> and the reinforcing layer <NUM> can be ensured, but also the electronic device <NUM> can be made to be relatively thin.

Similarly, the reinforcing layer <NUM> is attached to the display module <NUM> via the fourth optical adhesive layer <NUM> in full lamination or in edge lamination.

As illustrated in <FIG>, the reinforcing layer <NUM> and the display module <NUM> being attached in full lamination refers to that the reinforcing layer <NUM> and the display module <NUM> are attached seamlessly. That is, the fourth optical adhesive layer <NUM> covers the whole surface of the reinforcing layer <NUM> or the whole surface of the display module <NUM>, and there is no gap between the reinforcing layer <NUM> and the display module <NUM>. When the reinforcing layer <NUM> is attached to the display module <NUM> via the fourth optical adhesive layer <NUM> in full lamination, the reinforcing layer <NUM> can be firmly attached to the display module <NUM>, and the reinforcing layer <NUM> has a high reinforcement effect. Furthermore, it is possible to reduce the chance that dust and moisture enter the reinforcing layer <NUM> and the display module <NUM>.

As illustrated in <FIG>, the reinforcing layer <NUM> and the display module <NUM> being attached in edge lamination refers to that a side or an edge of the reinforcing layer <NUM> is attached to a side or an edge of the display module <NUM> via the fourth optical adhesive layer <NUM>. That is, the fourth optical adhesive layer <NUM> is coated on the periphery of the reinforcing layer <NUM> or the display module <NUM> (around the reinforcing layer <NUM> or the display module <NUM>), and there is a gap between the reinforcing layer <NUM> and the display module <NUM>. In one example, the gap may be filled with some transparent materials (such as PET chipper than optical adhesive), so as to enhance structural stability and reduce the possibility that dust and moisture enter the reinforcing layer <NUM> and the display module <NUM>. When the reinforcing layer <NUM> is attached to the display module <NUM> via the fourth optical adhesive layer <NUM> in edge lamination, the fourth optical adhesive layer <NUM> is relatively small in size, and thus cost is reduced and the lamination efficiency is improved.

The fourth optical adhesive layer <NUM> is made from at least one of an OCA, a PVB film, or a DAF. As one example, when the fourth optical adhesive layer <NUM> is made from an OCA, the fourth optical adhesive layer <NUM> is soft, and the lamination process is simple. In addition, when the cover plate <NUM> is pressed by the user's finger, the fourth optical adhesive layer <NUM> can reduce impact on the display module <NUM>. As another example, when the fourth optical adhesive layer <NUM> is made from a PVB film, the fourth optical adhesive layer <NUM> has a relatively high stickiness, which is conducive to ensuring the structural stability between the reinforcing layer <NUM> and the display module <NUM>. As yet another example, when the fourth optical adhesive layer <NUM> is made from a DAF, it is possible to reduce bubbles produced in the lamination process and improve the lamination efficiency, thereby enhancing the flatness of the coupling between the reinforcing layer <NUM> and the display module <NUM>.

When the fourth optical adhesive layer <NUM> is made from at least one of an OCA, a PVB film, or a DAF, a thickness of the fourth optical adhesive layer <NUM> rangers from <NUM> to <NUM>. That is, the thickness of the fourth optical adhesive layer <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the fourth optical adhesive layer <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or the like. For another example, the thickness of the fourth optical adhesive layer <NUM> is <NUM>, and thus not only the stability of the coupling between the reinforcing layer <NUM> and the display module <NUM> can be ensured, but also the electronic device <NUM> can be made to be relatively thin.

As illustrated in <FIG>, a method for assembling the display assembly <NUM> is provided. The method begins at block <NUM>.

At block <NUM>, the display module <NUM>, the capacitive fingerprint sensor film <NUM>, and the cover plate <NUM> are provided.

At block <NUM>, the capacitive fingerprint sensor film <NUM> is disposed between the cover plate <NUM> and the display module <NUM>, and the capacitive fingerprint sensor film <NUM> covers a display surface <NUM> of the display module <NUM>, so as to sense a fingerprint of a finger in contact with the cover plate <NUM>.

It should be noted that for the explanation of the display assembly <NUM> in the method, reference may be made to the foregoing implementations, and will not be repeated herein.

In the method for assembling the display assembly <NUM>, the capacitive fingerprint sensor film <NUM> covers the display surfaces <NUM>, such that a full-screen fingerprint recognition function can be achieved. Compared with the local fingerprint recognition, the operation is convenient. In addition, compared with optical fingerprint recognition, when the capacitive fingerprint sensor film <NUM> is used for fingerprint recognition, a relatively large camera is not needed, and only the capacitive fingerprint sensor film <NUM> is needed, such that the electronic device <NUM> is thin, and design of the electronic device <NUM> is simple.

As illustrated in <FIG>, the method further includes the following.

At block <NUM>, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM>.

At block <NUM>, the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM>.

During assembling of the display assembly <NUM>, for operations at block <NUM>, the first optical adhesive layer <NUM> is coated on a back surface <NUM> of the cover plate <NUM> or a light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM>, and then the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM>. For operations at block <NUM>, the second optical adhesive layer <NUM> is coated on a back surface <NUM> of the capacitive fingerprint sensor film <NUM> or the display surface <NUM>, and then the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM>. In one example, the operations at block <NUM> can be performed before the operations at block <NUM>, or the operations at block <NUM> can be performed before the operation at block <NUM>, or the operations at block <NUM> and <NUM> can be performed simultaneously. In this way, the display assembly <NUM> obtained is as illustrated in <FIG> or <FIG>. In addition, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM> in full lamination, and the capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM> in full lamination or in edge lamination, which are not described in detail herein.

At block <NUM>, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via a first optical adhesive layer <NUM>.

At block <NUM>, the cover plate <NUM> is attached to the display module <NUM> via a second optical adhesive layer <NUM>.

During assembling of the display assembly <NUM>, for operations at block <NUM>, the first optical adhesive layer <NUM> is coated on a back surface <NUM> of the cover plate <NUM> or a light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM>, and then the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM>. For operations at block <NUM>, the second optical adhesive layer <NUM> is coated on a back surface <NUM> of the cover plate <NUM> or the display surface <NUM>, and then the cover plate <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM>. In this way, the display assembly <NUM> obtained is as illustrated in <FIG>. In addition, the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM> in full lamination, and the cover plate <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM> in edge lamination, which are not described in detail herein.

It should be noted that during assembling of the display assembly <NUM>, there are other coating and lamination manners, as long as the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, and the display module <NUM> are attached via the adhesive layer <NUM>, and the display module <NUM>, the capacitive fingerprint sensor film <NUM>, and the cover plate <NUM> are sequentially stacked together in a light-exiting direction of the display assembly <NUM>.

After the assembling of the display assembly <NUM> is completed, the display assembly <NUM> is coupled with the front casing <NUM> in a glue dispensing or adhesive manner. A circuit board (for example, a sensor chip <NUM> and a display chip <NUM> described below) of the display assembly <NUM> communicates with a main board (for example, a main board chip <NUM> described below) of the electronic device <NUM> to implement a display function and a fingerprint recognition function of the display assembly <NUM>.

As illustrated in <FIG>, the display assembly <NUM> further includes a reinforcing layer <NUM>, and the method further includes the following.

At block <NUM>, the reinforcing layer <NUM> is arranged between the capacitive fingerprint sensor film <NUM> and the display module <NUM>.

As illustrated in <FIG>, in at least one implementation, the method further includes the following.

At block <NUM>, the capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via a third optical adhesive layer <NUM>.

At block <NUM>, the reinforcing layer <NUM> is attached to the display module <NUM> via a fourth optical adhesive layer <NUM>.

During assembling of the display assembly <NUM>, for operations at block <NUM>, the first optical adhesive layer <NUM> is coated on a back surface <NUM> of the cover plate <NUM> or a light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM>, and then the cover plate <NUM> is attached to the capacitive fingerprint sensor film <NUM> via the first optical adhesive layer <NUM>. For operations at block <NUM>, the third optical adhesive layer <NUM> is coated on a back surface <NUM> of the capacitive fingerprint sensor film <NUM> or a light-exiting surface <NUM> of the reinforcing layer <NUM>, and then the capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via the third optical adhesive layer <NUM>. For operations at block <NUM>, the fourth optical adhesive layer <NUM> is coated on a back surface <NUM> of the reinforcing layer <NUM> or the display surface <NUM>, and then the reinforcing layer <NUM> is attached to the display module <NUM> via the fourth optical adhesive layer <NUM>. The operations at block <NUM>, <NUM>, and <NUM> can be performed in any order. For example, the operations at block <NUM>, <NUM>, and <NUM> can be performed sequentially, or the operations at block <NUM> and <NUM> can be performed simultaneously and then the operations at block <NUM> may be performed, which are not enumerated herein. In this way, the display assembly <NUM> obtained may be as illustrated in <FIG>. In addition, the capacitive fingerprint sensor film <NUM> is attached to the reinforcing layer <NUM> via the third optical adhesive layer <NUM> in full lamination or in edge lamination, and the reinforcing layer <NUM> is attached to the display module <NUM> via the fourth optical adhesive layer <NUM> in full lamination or in edge lamination, which are not described in detail herein.

It should be noted that during assembling of the display assembly <NUM>, there are other coating and lamination manners, as long as the cover plate <NUM>, the capacitive fingerprint sensor film <NUM>, the reinforcing layer <NUM>, and the display module <NUM> are attached via the adhesive layer <NUM>, and the display module <NUM>, the reinforcing layer <NUM>, the capacitive fingerprint sensor film <NUM>, and the cover plate <NUM> are sequentially stacked together in the light-exiting direction of the display assembly <NUM>.

As illustrated in <FIG>, in one example, the display assembly <NUM> further includes a polarizer <NUM>. The polarizer <NUM> is attached to the cover plate <NUM> (the back surface <NUM> of the cover plate <NUM>) via the adhesive layer <NUM>. The polarizer <NUM> is arranged between the cover plate <NUM> and the capacitive fingerprint sensor film <NUM>. Specifically, the polarizer <NUM> is arranged between the back surface <NUM> of the cover plate <NUM> and the light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM>. The polarizer <NUM> has a light-exiting surface <NUM> and a back surface <NUM> opposite the light-exiting surface <NUM>. The light-exiting surface <NUM> of the polarizer <NUM> faces the back surface <NUM> of the cover plate <NUM>, and the back surface <NUM> of the polarizer <NUM> faces the light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM>.

In one example, a thickness of the polarizer <NUM> ranges from <NUM> to <NUM>. That is, the thickness of the polarizer <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the polarizer <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or the like.

The polarizer <NUM> is an optical thin film composed of multilayer polymer materials and can generate polarized light. The polarizer <NUM> can convert natural light without polarization into polarized light, to allow light perpendicular to the electric field to pass through the capacitive fingerprint sensor film <NUM>, so as to control passage of light. When the polarizer <NUM> is disposed between the cover plate <NUM> and the capacitive fingerprint sensor film <NUM>, it is possible to reduce ambient lights incident from the cover plate <NUM> to the capacitive fingerprint sensor film <NUM>, so as to alleviate a phenomenon that the appearance of the display assembly <NUM> presents an abnormal color at a certain angle (for example, the appearance is earthy yellow) due to that the ambient lights are reflected by metal grid wires of the capacitive fingerprint sensor film <NUM>.

As illustrated in <FIG>, the polarizer <NUM> may be a circular polarizer. The polarizer <NUM> includes a protection film <NUM>, a triacetyl cellulose (TAC) functional film <NUM>, a polyvinyl alcohol (PVA) film <NUM>, a light plate TAC film <NUM>, a pressure-sensitive adhesive layer <NUM>, and a release film <NUM> that are stacked together in the light-existing direction of the display assembly <NUM>. Some processes may be applied to the surface of the TAC functional film <NUM> to achieve corresponding additional functions. For example, the surface of the TAC functional film <NUM> may be subjected to antiglare treatment (AG), antiglare and low reflection treatment (AG+LR), transparent hardening and low reflection treatment (CHC+LR), transparent hardening treatment (CHC), antireflection treatment (AR), or the like. Different treatment manners may enable the electronic device <NUM> to meet different application requirements. According to implementations, the antireflection treatment is applied to the surface of the TAC functional film <NUM>, such that the TAC functional film <NUM> has an antireflection function (that is, with the interference effect, reflected lights on the front and back surfaces of the TAC functional film <NUM> are eliminated mutually to reduce reflection), and thus reflected lights generated by the capacitive fingerprint sensor film <NUM> may be reduced. Furthermore, the phenomenon that the appearance of the display assembly <NUM> presents earthy yellow at a certain angle due to that the ambient lights are reflected by the metal grid wires of the capacitive fingerprint sensor film <NUM> can be alleviated.

Since the polarizer <NUM> can decrease the brightness of the display module <NUM>, a polarizer in the display module <NUM> can be removed.

As one example, when the display module <NUM> is the LCM <NUM>, the LCM <NUM> includes a backlight module <NUM>, a lower polarizer <NUM>, a TFT substrate <NUM>, a liquid crystal layer <NUM>, a color filter <NUM>, and an upper polarizer <NUM> that are disposed in the light-exiting direction of the display assembly <NUM> (as illustrated in <FIG>), and therefore the upper polarizer <NUM> may be removed (canceled) under a condition that display assembly <NUM> includes the polarizer <NUM>. In this case, the LCM <NUM> only includes the backlight module <NUM>, the lower polarizer <NUM>, the TFT substrate <NUM>, the liquid crystal layer <NUM>, and the color filter <NUM> that are stacked together in the light-exiting direction of the display assembly <NUM> (as illustrated in <FIG>), and the polarizer <NUM> can be used as the upper polarizer <NUM> in the LCM <NUM>.

As another example, when the display module <NUM> is the OLED display <NUM>, the OLED display <NUM> includes a glass TFT substrate <NUM>, an OLED <NUM>, a encapsulation glass <NUM>, and an OLED polarizer <NUM> that are disposed in the light-exiting direction of the display assembly <NUM> (as illustrated in <FIG>), and therefore the OLED polarizer <NUM> can be removed under a condition that display assembly <NUM> includes the polarizer <NUM>. In this case, the OLED display <NUM> only includes the glass TFT substrate <NUM>, the OLED <NUM>, and the encapsulation glass <NUM> that are stacked together in the light-exiting direction of the display assembly <NUM> (as illustrated in <FIG>), and the polarizer <NUM> can be used as the OLED polarizer in the OLED display <NUM>.

Alternatively, since the polarizer of the display module <NUM> only causes a relatively small reduction in the brightness of the display module <NUM>, there is no need to remove the polarizer of the display module <NUM>. Therefore, the display module <NUM> illustrated in <FIG> can also be adopted.

When the display assembly <NUM> includes the polarizer <NUM>, the cover plate <NUM>, the polarizer <NUM>, the capacitive fingerprint sensor film <NUM>, and the display module <NUM> are attached via the adhesive layer <NUM>.

As illustrated in <FIG>, as one example, when the adhesive layer <NUM> includes the first optical adhesive layer <NUM> and the second optical adhesive layer <NUM>, the cover plate <NUM> and the polarizer <NUM> (for example, the back surface <NUM> of the cover plate <NUM> and a light-exiting surface <NUM> of the polarizer <NUM>) are attached via the first optical adhesive layer <NUM>, and the capacitive fingerprint sensor film <NUM> and the display module <NUM> (for example, the back surface <NUM> of the capacitive fingerprint sensor film <NUM> and the display surface <NUM>) are attached via the second optical adhesive layer <NUM>. According to implementations, the cover plate <NUM>, the first optical adhesive layer <NUM>, the polarizer <NUM>, the capacitive fingerprint sensor film <NUM>, the second optical adhesive layer <NUM>, and the display module <NUM> are sequentially stacked together in the direction opposite the light-exiting direction of the display assembly <NUM>. In one example, the cover plate <NUM> is attached to the polarizer <NUM> via the first optical adhesive layer <NUM> in full lamination. The capacitive fingerprint sensor film <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM> in full lamination or in edge lamination.

As illustrated in <FIG>, as another example, when the adhesive layer <NUM> includes the first optical adhesive layer <NUM> and the second optical adhesive layer <NUM>, the cover plate <NUM> and the polarizer <NUM> (for example, the back surface <NUM> of the cover plate <NUM> and a light-exiting surface <NUM> of the polarizer <NUM>) are attached via the first optical adhesive layer <NUM>, and the cover plate <NUM> and the display module <NUM> (for example, the back surface <NUM> of the cover plate <NUM> and the display surface <NUM>) are attached via the second optical adhesive layer <NUM>. According to implementations, in the central region of the cover plate <NUM>, the cover plate <NUM>, the first optical adhesive layer <NUM>, the polarizer <NUM>, the capacitive fingerprint sensor film <NUM>, and the display module <NUM> are sequentially stacked together in the direction opposite the light-exiting direction of the display assembly <NUM>. In the edge region of the cover plate <NUM>, the cover plate <NUM>, the second optical adhesive layer <NUM>, and the display module <NUM> are sequentially stacked together in the direction opposite the light-exiting direction of the display assembly <NUM>. In one example, the cover plate <NUM> is attached to the polarizer <NUM> via the first optical adhesive layer <NUM> in full lamination. The cover plate <NUM> is attached to the display module <NUM> via the second optical adhesive layer <NUM> in edge lamination.

As illustrated in <FIG>, according to the invention, the display assembly <NUM> further includes an antireflection film <NUM>. The antireflection film <NUM> is disposed between the cover plate <NUM> and the capacitive fingerprint sensor film <NUM>. Specifically, the antireflection film <NUM> is disposed between the back surface <NUM> of the cover plate <NUM> and the light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM>. The antireflection film <NUM> has a light-exiting surface <NUM> and a back surface <NUM> opposite the light-exiting surface <NUM>. The light-exiting surface <NUM> of the antireflection film <NUM> faces the back surface <NUM> of the cover plate <NUM>. The back surface <NUM> of the antireflection film <NUM> faces the light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM>.

The thickness of the antireflection film <NUM> ranges from <NUM> to <NUM>. That is, the thickness of the antireflection film <NUM> may be any value between <NUM> and <NUM>. For example, the thickness of the antireflection film <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or the like.

The antireflection film <NUM> is also known as an anti-reflection film, an antireflection and transmission film, or an anti-refletance (AR) film, and so on. The antireflection film <NUM> is formed by forming a multi-layer composite optical film on a substrate in a sputtering process, where for the sputtering process a low refractive index (L) material and a high refractive index (H) material are alternatively adopted to form a film stack, layers and a thickness of the film stack are controlled, and reflection of the surface of the substrate may be reduced with interference effects. According to implementations, the substrate may be the cover plate <NUM> or the capacitive fingerprint sensor film <NUM>.

Specifically, the antireflection film <NUM> may be formed on the back surface <NUM> of the cover plate <NUM> (as illustrated in <FIG>), or formed on the light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM> (as illustrated in <FIG>). By means of arranging the antireflection film <NUM> on the back surface <NUM> of the cover plate <NUM> or the light-exiting surface 21of the capacitive fingerprint sensor film <NUM>, it is possible to reduce reflected lights generated by the capacitive fingerprint sensor film <NUM>, alleviate the phenomenon that the side of the display module <NUM> presents earthy yellow due to that the lights are reflected by the metal grid wires of the capacitive fingerprint sensor film <NUM>, and improve the appearance. In addition, it is possible to play the role of anti-glare, and thus even strong light exists, the user can clearly view the image displayed by the display module <NUM>.

It should be noted that compared with the structures of the display assembly <NUM> illustrated in <FIG>, and <FIG>, in the display assembly <NUM> illustrated in <FIG>, only the antireflection film <NUM> is provided on the back surface <NUM> of the cover plate <NUM> or the light-exiting surface <NUM> of the capacitive fingerprint sensor film <NUM>, and other structures may be the same as that illustrated in <FIG> and <FIG>. After the antireflection film <NUM> is provided, other structures illustrated in <FIG> and <FIG> may be changed accordingly. For example, the cover plate <NUM>, the antireflection film <NUM>, the capacitive fingerprint sensor film <NUM>, and the display module <NUM> are attached via the adhesive layer <NUM>. When the adhesive layer <NUM> includes the first optical adhesive layer <NUM> and the second optical adhesive layer <NUM>, the antireflection film <NUM> and the capacitive fingerprint sensor film <NUM> are attached via the first optical adhesive layer <NUM> (as illustrated in <FIG>), and the cover plate <NUM> and the antireflection film <NUM> are attached via the first optical adhesive layer <NUM> (as illustrated in <FIG>), which are not described in detail herein.

As illustrated in <FIG> and <FIG>, in one example, the display assembly <NUM> further includes a high impedance film <NUM>. The capacitive fingerprint sensor film <NUM> includes a sensor substrate <NUM> and a sensor circuit layer <NUM> (i.e., the metal grid wires described above) that are disposed in the light-exiting direction of the display assembly <NUM>. The sensor circuit layer <NUM> is disposed on the sensor substrate <NUM>. The sensor circuit layer <NUM> is configured to detect capacitance values to obtain a fingerprint image when fingerprint recognition is performed. The high impedance film <NUM> is disposed between the sensor circuit layer <NUM> and the sensor substrate <NUM>. As illustrated in <FIG>, the high impedance film <NUM> defines a through hole, so that the sensor circuit layer <NUM> passes through the through hole to be formed on the sensor substrate <NUM>. The high impedance film <NUM> has a light-exiting surface <NUM> and a back surface <NUM> opposite the light-exiting surface <NUM>. The light-exiting surface <NUM> of the high impedance film <NUM> faces the sensor circuit layer <NUM>. The back surface <NUM> of the high impedance film <NUM> faces the sensor substrate <NUM>.

The thickness of the high impedance film <NUM> ranges from <NUM> to <NUM>. That is, the thickness of the high impedance film <NUM> is any value between <NUM> and <NUM>. For example, the thickness of the high impedance film <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or the like.

The high impedance film <NUM> is composed of graphite oxide, stannic oxide, and a mixture of surfactant and cross-linking agent. The high impedance film <NUM> is disposed between the sensor circuit layer <NUM> and the sensor substrate <NUM>, which can avoid or reduce mutual interference between the capacitive fingerprint sensor film <NUM> and the display module <NUM>, thereby avoiding that functions of the capacitive fingerprint sensor film <NUM> and the display module <NUM> are affected due to the mutual interference between the capacitive fingerprint sensor film <NUM> and the display module <NUM>.

It should be noted that compared with the structure of the display assembly <NUM> illustrated in <FIG> and <FIG>, in the display assembly <NUM> illustrated in <FIG> and <FIG>, the high impedance film <NUM> is provided between the sensor circuit layer <NUM> and the sensor substrate <NUM>, and other structures are the same as those in <FIG> and <FIG>, which will not be explained herein.

In addition, the capacitive fingerprint sensor film <NUM> in <FIG> and the capacitive fingerprint sensor film <NUM> in <FIG> may have a same or corresponding structure, or may have two different structures. When the capacitive fingerprint sensor film <NUM> in <FIG> and the capacitive fingerprint sensor film <NUM> in <FIG> have the same or corresponding structure, the sensor substrate <NUM> may be equivalent to the sensor board <NUM>, and the sensor circuit layer <NUM> may be equivalent to the pixel sensors <NUM>, the pixel amplifiers <NUM>, and the output circuits <NUM>. Alternatively, when the capacitive fingerprint sensor film <NUM> in <FIG> further includes a semiconductor substrate, the sensor substrate <NUM> may be equivalent to the semiconductor substrate, and the sensor circuit layer <NUM> may be equivalent to the pixel sensors <NUM>, the sensor board <NUM>, the pixel amplifiers <NUM>, and the output circuits <NUM>. It should be noted that there is no need to provide the pixel amplifier <NUM> for the capacitive fingerprint sensor film <NUM>, which is not limited herein.

As illustrated in <FIG> and <FIG>, in one example, in addition to the fingerprint recognition function, the capacitive fingerprint sensor film <NUM> can be used as a touch sensor <NUM> of the display module <NUM> to implement a touch function. That is, there is no need to arrange an additional touch sensor <NUM> for the display module <NUM> (the structure of the display module <NUM> is as illustrated in <FIG>). The dual functions (that is, fingerprint recognition function and touch function) can be realized with the capacitive fingerprint sensor film <NUM>. With such configuration, the display assembly <NUM> is simple in structure, thin, high in integration, low in cost, and good in light transmittance. Furthermore, it is possible to reduce the number of connecting terminals and volume of the display assembly <NUM>, such that the design is simple.

The fingerprint recognition function and touch function of the capacitive fingerprint sensor film <NUM> may be implemented in a time division multiplexing manner. That is, when the capacitive fingerprint sensor film <NUM> is configured to implement the fingerprint recognition function, the capacitive fingerprint sensor film <NUM> does not implement the touch function (that is, the touch function is disabled). When the capacitive fingerprint sensor film <NUM> is configured to implement the touch function, the capacitive fingerprint sensor film <NUM> does not implement the fingerprint recognition function (that is, the fingerprint recognition function is disabled).

As one example, when the capacitive fingerprint sensor film <NUM> is configured to implement fingerprint recognition function, the capacitive fingerprint sensor film <NUM> detects capacitance values of multiple touch points. Since the finger has an uneven surface, that is, a finger has concave points (i.e., valleys of a fingerprint of the finger) and convex points (i.e., ridges of the fingerprint), the capacitance values corresponding to the ridges and valleys may be different. Therefore, according to the capacitance values of different touch points, whether the touch point is in contact with a concave point or a convex point of the finger can be determined, such that a fingerprint image may be obtained, and therefore, according to the fingerprint image, fingerprint recognition can be performed.

As another example, when the capacitive fingerprint sensor film <NUM> is configured to implement the touch function, the capacitive fingerprint sensor film <NUM> detects capacitance values of multiple touch points. Since a capacitance value of a touch point in case that the finger is pressed on the cover plate <NUM> is not the same as that of the touch point in case that the finger is not pressed on the cover plate <NUM>, whether the touch point is pressed can be determined according to change in the capacitance value corresponding to the touch point. According to change in the capacitance value corresponding to each of the multiple touch points, determine whether the touch point is pressed, and thus coordinates of touch points which are pressed by the user's finger and a press trajectory may be determined, such that the electronic device <NUM> may be controlled to implement the touch function in response to the press operation (the coordinates of touch points and the press trajectory) of the user's finger.

As illustrated in <FIG>, the display assembly <NUM> further includes a sensor chip <NUM>. The sensor chip <NUM> is coupled with the capacitive fingerprint sensor film <NUM>. The sensor chip <NUM> is configured to read capacitance values detected by the capacitive fingerprint sensor film <NUM>, and to form a fingerprint image for fingerprint recognition according to the capacitance values, thereby implementing a fingerprint recognition function. Alternatively, the sensor chip <NUM> is configured to read capacitance values detected by the capacitive fingerprint sensor film <NUM>, and determine the coordinates of the touch points and the press trajectory according to the capacitance values, thereby implementing the touch function.

After the sensor chip <NUM> reads the capacitance values detected by the capacitive fingerprint sensor film <NUM>, whether the capacitance values are used for the fingerprint recognition function or the touch function may be determined according to application scenarios of the electronic device <NUM>. For example, when the electronic device <NUM> is applicable to an encryption scenario, an unlocking scenario, a payment scenario, and the like, the sensor chip <NUM> reads the capacitance values detected by the capacitive fingerprint sensor film <NUM>, and implements a fingerprint recognition function according to the capacitance values detected. For another example, when the electronic device <NUM> is applicable to a scenario other than the above scenarios, the sensor chip <NUM> reads the capacitance values detected by the capacitive fingerprint sensor film <NUM>, and implements a touch function according to the capacitance values detected.

It should be noted that the electronic device <NUM> may further provide other judgment logics to determine whether the capacitive fingerprint sensor film <NUM> and the sensor chip <NUM> are used to implement a fingerprint recognition function or a touch function, which is not limited herein.

As illustrated in <FIG> and <FIG>, in one example, the electronic device <NUM> further includes a main board chip <NUM>. The display assembly <NUM> further includes a sensor chip <NUM> and a display chip <NUM>. The sensor chip <NUM> is coupled with the capacitive fingerprint sensor film <NUM>, and the display chip <NUM> is coupled with the display module <NUM>. The sensor chip <NUM> and the display chip <NUM> are respectively coupled with the main board chip <NUM>, where the sensor chip <NUM> is coupled with the main board chip <NUM> to implement the fingerprint recognition function, and the display chip <NUM> is coupled with the main board chip <NUM> to implement the display function.

The main board chip <NUM> can control the capacitive fingerprint sensor film <NUM> and the display module <NUM> to work in different time periods through the sensor chip <NUM> and the display chip <NUM>. As one example, in <FIG>, when the capacitive fingerprint sensor film <NUM> is configured to implement the fingerprint recognition function, the sensor chip <NUM> controls the capacitive fingerprint sensor film <NUM> to work according to a first working signal T<NUM>, and the main board chip <NUM> obtains, from the sensor chip <NUM>, a first synchronization signal T10 corresponding to the first working signal T1, and then instructs the display chip <NUM> to disable the display module <NUM> according to the first synchronization signal T10. As another example, in <FIG>, when the display module <NUM> is configured to implement the display function, the display chip <NUM> controls the display module <NUM> to work according to a second working signal T<NUM>, and the main board chip <NUM> obtains, from the display chip <NUM>, a second synchronization signal T<NUM> corresponding to the second working signal T2, and then instructs the sensor chip <NUM> to disable the capacitive fingerprint sensor film <NUM> according to the second synchronization signal T20. According to implementations, the capacitive fingerprint sensor film <NUM> and the display module <NUM> may be implemented in a time division multiplexing manner, and a time period for sending the first working signal T<NUM> and a time period required for sending the second working signal T<NUM> are staggered, so as to avoid the confusion and mutual interference between the capacitive fingerprint sensor film <NUM> and the display module <NUM> in the process of using the electronic device <NUM>.

In one example, a display frequency of the display module <NUM> can be higher than a fingerprint detection frequency of the capacitive fingerprint sensor film <NUM>, and there may be multiple second working signals T2 between two adjacent first working signals T<NUM>. For example, as illustrated in <FIG>, the display frequency of the display module <NUM> is twice the fingerprint detection frequency of the capacitive fingerprint sensor film <NUM>, and there are two second working signals T2 between two adjacent first working signals T<NUM>. Generally, the user mainly uses the display function of the electronic device <NUM>, and thus the display module <NUM> needs to be more frequently used than the capacitive fingerprint sensor film <NUM>. Therefore, by setting the display frequency of the display module <NUM> to be higher than the fingerprint detection frequency of the capacitive fingerprint sensor film <NUM>, the actual needs of the user can be satisfied.

In the description of the specification, the description of the reference terms "one implementation, "some implementations", "examples", or "some examples" refer to the fact that the specific characteristic, structure, or feature described in combination with the implementations or examples is contained in the at least one implementation or example. In the specification, the schematic expression of the above terms unnecessarily aims at the same implementation or example. In addition, the described specific characteristic, structure, or feature can be combined in a proper manner in any one or more implementations or examples.

Any process or method illustrated in a flow chart or herein in other manners can be understood as a module, a fragment, or a portion of codes that include one or more executable instructions for implementing a particular logical function or operations of a process. The scope of the implementations includes additional implementations in which the functions may be performed out of the order illustrated or discussed. For example, the functions can be performed in a substantially simultaneous manner or in the reverse order according to the functions involved, which should be understood by those skilled in the art.

Claim 1:
A display assembly (<NUM>), comprising:
a flexible screen;
a cover plate (<NUM>); and
a capacitive fingerprint sensor film (<NUM>) disposed between the cover plate (<NUM>) and the flexible screen, wherein the capacitive fingerprint sensor film (<NUM>) covers a display surface of the flexible screen, to sense a fingerprint of a finger in contact with the cover plate (<NUM>);
characterized in that the display assembly (<NUM>) further comprises an antireflection film (<NUM>), wherein the antireflection film (<NUM>) is disposed between the cover plate (<NUM>) and the capacitive fingerprint sensor film (<NUM>).