Fingerprint detection apparatus, fingerprint chip, display device and electronic device

Abstract

The present disclosure relates to a fingerprint detection device, a fingerprint chip, a display device and an electronic device, which are applied to a display panel, and the device comprises a switching module connected to an optical fingerprint chip, used for switching the working mode of the optical fingerprint chip to a touch detection mode or a fingerprint collection mode, wherein when the optical fingerprint chip works in the touch detection mode, the optical fingerprint chip is used for detecting whether the display panel is touched; when the optical fingerprint chip works in the fingerprint collection mode, the optical fingerprint chip is used for collecting fingerprints. The embodiment of the present disclosure can detect whether the display panel is touched by using the optical fingerprint chip, and collect fingerprints. Compared with the related art, the use of touch sensors or pressure sensors is saved, the cost is saved, and the process complexity is reduced, so that the response speed is improved and the overall power consumption is reduced.

Description

Technical Field

[0001] This disclosure relates to the field of fingerprint recognition technology, and in particular to a fingerprint detection device, a fingerprint chip, a display device, and an electronic device. Background Technology

[0002] Current optical fingerprint exposure control requires system-level control and participation. The system needs to use touch sensors or pressure sensors to determine if a finger is pressing on a designated area. The sensor then notifies the system or informs the fingerprint chip via an on-chip bus. Finally, the system controls the fingerprint chip to start acquiring images. As can be seen, the current fingerprint acquisition solution makes the entire triggering process very cumbersome, power-consuming, and slow in response. Summary of the Invention

[0003] In view of this, the present disclosure proposes a fingerprint detection device for use in a display panel, the device comprising:

[0004] A switching module, connected to the optical fingerprint chip, is used to switch the operating mode of the optical fingerprint chip between touch detection mode and fingerprint acquisition mode.

[0005] Specifically, when the optical fingerprint chip operates in the touch detection mode, it is used to detect whether the display panel is touched; when the optical fingerprint chip operates in the fingerprint acquisition mode, it is used to acquire fingerprints.

[0006] In one possible implementation, the switching module is used to:

[0007] When the optical fingerprint chip is working in the touch detection mode, it is used to determine whether the display panel has been touched. If a touch is determined to have occurred, the working mode of the optical fingerprint chip is switched to the fingerprint acquisition mode so that the optical fingerprint chip can acquire fingerprints.

[0008] In one possible implementation, the switching module is used to:

[0009] When the optical fingerprint chip is working in the fingerprint acquisition mode, if the display panel enters sleep mode or the optical fingerprint chip does not detect a fingerprint for a preset duration, the working mode of the optical fingerprint chip is switched to the touch detection mode.

[0010] In one possible implementation, the switching module includes multiple switching units, each switching unit including multiple first multiplexers and multiple first switches, and each switching unit is respectively connected to a corresponding detection unit of the optical fingerprint chip, wherein...

[0011] The first selection terminal of each first multiplexer is connected to the corresponding pixel of the display panel, the second selection terminal of each first multiplexer is grounded, the common output terminal of each first multiplexer is connected to the first terminal of the first capacitor of the corresponding detection unit, and the control terminal of each first multiplexer is used to receive the first multiplexing control signal.

[0012] The control terminal of each first switch is used to receive the first switch control signal. The first terminal of each first switch is grounded through the photodiode of the corresponding detection unit. The second terminal of each first switch is connected to the first common node of the second terminal of the first capacitor and the first terminal of the second capacitor of the detection unit. The first common node is connected to the integration circuit of the detection unit.

[0013] In one possible implementation, under the touch detection mode, each first multiplexer control signal controls each first multiplexer to connect to the corresponding pixel, and each first switch control signal controls each first switch to disconnect.

[0014] In one possible implementation, in the fingerprint acquisition mode, each first multiplexer control signal controls each first multiplexer to connect to ground, and each first switch control signal controls each first switch to be turned on.

[0015] In one possible implementation, each switching unit further includes a second multiplexer and a plurality of second switches, wherein,

[0016] The first common node of each switching unit is connected to each selection terminal of the second multiplexer. The common output terminal of the second multiplexer is connected to the integration circuit of the first detection unit. The control terminal of the second multiplexer is used to receive the second multiplexing control signal. The first detection unit can be any one of the multiple detection units.

[0017] The first common node of all other detection units, excluding the first detection unit, is connected to the corresponding integration circuit through the first terminal and the second terminal of the second switch. The control terminal of the second switch is used to receive the control signal of the second switch.

[0018] In one possible implementation, under the touch detection mode,

[0019] In the touch detection mode, each first multiplex control signal controls each first multiplexer to connect to the corresponding pixel, each first switch control signal controls each first switch to open, each second switch control signal controls each second switch to open, and the second multiplex control signal controls the second multiplexer to select any first common node to connect to the integration circuit of the first detection unit.

[0020] In the fingerprint acquisition mode, each first multiplexer control signal controls each first multiplexer to connect to ground, each first switch control signal controls each first switch to be turned on, each second switch control signal controls each second switch to be turned on, and the second multiplexer control signal controls the second multiplexer to select the first common node of the first detection unit to be connected to the integration circuit of the first detection unit.

[0021] In one possible implementation, the device further includes:

[0022] The control module is used for:

[0023] When the optical fingerprint chip is working in the touch detection mode, it acquires the integration results of each integration circuit at a preset period, and determines whether a touch has occurred based on the integration results and a preset touch threshold.

[0024] If the integration result reaches the preset touch threshold, a touch is determined to have occurred. The working mode of the optical fingerprint chip is switched to the fingerprint acquisition mode, and the light source component is turned on. After a preset delay, the fingerprint is acquired using the optical fingerprint chip.

[0025] In one possible implementation, the display panel includes at least one of a liquid crystal display panel, a micro light-emitting diode display panel, a light-emitting diode display panel, a mini light-emitting diode display panel, a quantum dot light-emitting diode display panel, an organic light-emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electrowetting display panel, and a small-pitch display panel.

[0026] According to another aspect of this disclosure, a fingerprint chip is provided, the fingerprint chip including the fingerprint detection device described above.

[0027] According to another aspect of this disclosure, a display device is provided, including the fingerprint chip.

[0028] According to another aspect of this disclosure, an electronic device is provided, including the aforementioned display device.

[0029] According to another aspect of this disclosure, an electronic device is provided, comprising any one of a display, smartphone, smartwatch, smart bracelet, tablet computer, laptop computer, all-in-one computer, access control device, and electronic door lock.

[0030] This disclosure provides a fingerprint detection device, comprising: a switching module connected to an optical fingerprint chip, used to switch the operating mode of the optical fingerprint chip to a touch detection mode or a fingerprint acquisition mode. When the optical fingerprint chip operates in the touch detection mode, it detects whether the display panel is touched; when it operates in the fingerprint acquisition mode, it performs fingerprint acquisition. By switching the operating mode of the optical fingerprint chip between touch detection and fingerprint acquisition modes using the switching module, the optical fingerprint chip can detect whether the display panel is touched and perform fingerprint acquisition. Compared to related technologies, this eliminates the need for touch sensors or pressure sensors, saving costs and reducing process complexity, thereby improving response speed and reducing overall power consumption.

[0031] Other features and aspects of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0032] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this disclosure together with the specification and serve to explain the principles of this disclosure.

[0033] Figure 1 A schematic diagram of fingerprint collection using relevant technologies is shown.

[0034] Figure 2 A block diagram of a fingerprint detection device according to an embodiment of the present disclosure is shown.

[0035] Figure 3 A schematic diagram of a detection unit of an optical fingerprint chip according to an embodiment of the present disclosure is shown.

[0036] Figure 4 A schematic diagram of a fingerprint detection device according to an embodiment of the present disclosure is shown.

[0037] Figure 5 A schematic diagram illustrating the division of the touch area in the display panel according to an embodiment of the present disclosure is shown.

[0038] Figure 6 A schematic diagram of a fingerprint detection device according to an embodiment of the present disclosure is shown.

[0039] Figure 7 A schematic diagram of a fingerprint detection device according to an embodiment of the present disclosure is shown. Detailed Implementation

[0040] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0041] In the description of this disclosure, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise expressly specified.

[0043] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0044] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0045] Please see Figure 1 , Figure 1 A schematic diagram of fingerprint collection using relevant technologies is shown.

[0046] like Figure 1As shown, the relevant touch technology requires that when the system is in sleep mode, a touch sensor or pressure sensor needs to detect changes in capacitance or voltage in a designated area to determine whether a finger touch has occurred. If a finger touch is confirmed, an interrupt is triggered to wake up the system (this process takes a relatively long time). After the system is woken up, it notifies the display device to turn on the screen or light source (lighting) and informs the system that it is ready. Then, after confirming that the light source is on, the system sends an image acquisition command to control the fingerprint module to start acquiring images. After the image acquisition is completed, the system retrieves the image data from the fingerprint module.

[0047] As can be seen from the above introduction, the fingerprint collection process in the relevant technologies is relatively long and takes a lot of time. It also requires the cooperation of external sensors (touch sensors or pressure sensors) to complete. It is evident that the relevant technologies are complex in structure, consume a lot of power, are costly, and have a slow response speed.

[0048] This disclosure provides a fingerprint detection device, comprising: a switching module connected to an optical fingerprint chip, used to switch the operating mode of the optical fingerprint chip to a touch detection mode or a fingerprint acquisition mode. When the optical fingerprint chip operates in the touch detection mode, it detects whether the display panel is touched; when it operates in the fingerprint acquisition mode, it performs fingerprint acquisition. By switching the operating mode of the optical fingerprint chip between touch detection and fingerprint acquisition modes using the switching module, the optical fingerprint chip can detect whether the display panel is touched and perform fingerprint acquisition. Compared to related technologies, this eliminates the need for touch sensors or pressure sensors, saving costs and reducing process complexity, thereby improving response speed and reducing overall power consumption.

[0049] This disclosure does not limit the specific type of the display panel. In one possible implementation, the display panel may include at least one of the following: liquid crystal display panel, micro light-emitting diode display panel, light-emitting diode display panel, mini light-emitting diode display panel, quantum dot light-emitting diode display panel, organic light-emitting diode display panel, cathode ray tube display panel, digital light processing display panel, field emission display panel, plasma display panel, electrophoretic display panel, electrowetting display panel, and small-pitch display panel.

[0050] Please see Figure 2 , Figure 2 A block diagram of a fingerprint detection device according to an embodiment of the present disclosure is shown.

[0051] The device is used in a display panel, such as Figure 2 As shown, the device includes:

[0052] The switching module 10, connected to the optical fingerprint chip 20, is used to switch the operating mode of the optical fingerprint chip 20 between touch detection mode and fingerprint acquisition mode.

[0053] Specifically, when the optical fingerprint chip 20 operates in the touch detection mode, the optical fingerprint chip 20 is used to detect whether the display panel is touched; when the optical fingerprint chip 20 operates in the fingerprint acquisition mode, the optical fingerprint chip 20 is used to acquire fingerprints.

[0054] This disclosure does not limit the specific implementation of the optical fingerprint chip 20, nor does it limit the specific implementation of the switching module 10. Those skilled in the art can select the required optical fingerprint chip 20 according to actual conditions and needs, and implement the switching module 10 in a suitable manner, as long as the switching module 10 can complete its function, that is, it can switch the working mode of the optical fingerprint chip 20 to touch detection mode or fingerprint acquisition mode, so that when the optical fingerprint chip 20 is working in the touch detection mode, the optical fingerprint chip 20 is used to detect whether the display panel is touched; when the optical fingerprint chip 20 is working in the fingerprint acquisition mode, the optical fingerprint chip 20 is used to perform fingerprint acquisition.

[0055] In one possible implementation, the switching module 10 can be used to:

[0056] When the optical fingerprint chip 20 is working in the touch detection mode, it is used to determine whether the display panel has been touched. If it is determined that a touch has occurred, the working mode of the optical fingerprint chip 20 is switched to the fingerprint acquisition mode so that the optical fingerprint chip 20 can acquire fingerprints.

[0057] Thus, this embodiment of the present disclosure does not require additional touch sensors or pressure sensors to achieve touch detection, determine whether a finger (or other object) touch has occurred, and thereby switch the working mode of the optical fingerprint chip 20 to the fingerprint acquisition mode so that the optical fingerprint chip 20 can acquire fingerprints.

[0058] In one possible implementation, the switching module 10 can be used to:

[0059] When the optical fingerprint chip 20 is working in the fingerprint acquisition mode, if the display panel enters sleep mode or the optical fingerprint chip 20 has not detected a fingerprint for a preset duration, the working mode of the optical fingerprint chip 20 is switched to the touch detection mode.

[0060] When the optical fingerprint chip 20 is working in the fingerprint acquisition mode, if the display panel has not been operated for a long time and has entered sleep mode or has been set to sleep mode by the user, or if the optical fingerprint chip 20 has not detected a fingerprint for a preset duration, this embodiment of the present disclosure can switch the working mode of the optical fingerprint chip 20 to the touch detection mode through the switching module 10, so that the optical fingerprint chip 20 can perform touch detection periodically.

[0061] The optical fingerprint chip 20 and the switching module 10 are described below by way of example. It should be understood that the switching module 10 can be set accordingly for different types of optical fingerprint chips 20. The description of the optical fingerprint chip 20 and the corresponding switching module 10 here should not be regarded as a limitation of this disclosure.

[0062] Please see Figure 3 , Figure 3 A schematic diagram of a detection unit of an optical fingerprint chip according to an embodiment of the present disclosure is shown.

[0063] In one example, such as Figure 3 As shown, each detection unit may include a photodiode D1, a first capacitor Cs, a second capacitor Cc, and an integrating circuit. The integrating circuit consists of an operational amplifier Amp, a third capacitor Cf, a third switch RST, and a fourth switch Q4. The positive terminal of photodiode D1 and the first terminal of the first capacitor Cs are grounded. The negative terminal of photodiode D1 is connected to the second terminal of the first capacitor Cs, the first terminal of the second capacitor Cc, and the first input terminal of the integrating circuit. The second terminal of the second capacitor Cc can be connected to other circuits such as a digital-to-analog converter (DAC). The first input terminal of the integrating circuit (i.e., the first input terminal of the operational amplifier Amp) can also be connected to the first terminal of the third capacitor Cf and the first terminal of the third switch RST. The second input terminal of the operational amplifier Amp is grounded. The output terminal of the operational amplifier Amp is connected to the second terminal of the third switch RST, the second terminal of the third capacitor Cf, and the first terminal of the fourth switch Q4. The control terminal of the third switch RST can be used to receive the integrating enable signal COL1RST to control whether the integrating circuit operates. The control terminal of the fourth switch Q4 is used to receive the output enable signal COL1. Sel controls whether the detection unit outputs the output voltage VOUT of the integrating circuit to the external control module 30. Figure 3 (Not shown).

[0064] Please see Figure 4 , Figure 4 A schematic diagram of a fingerprint detection device according to an embodiment of the present disclosure is shown.

[0065] In one possible implementation, such as Figure 4As shown, the switching module 10 may include multiple switching units, each switching unit may include multiple first multiplexers MUX1 and multiple first switches Q1, and each switching unit is respectively connected to the corresponding detection unit of the optical fingerprint chip 20, wherein,

[0066] The first selection terminal of each first multiplexer MUX1 is connected to the corresponding pixel of the display panel, the second selection terminal of each first multiplexer MUX1 is grounded, the common output terminal of each first multiplexer MUX1 is connected to the first terminal of the first capacitor Cs of the corresponding detection unit, and the control terminal of each first multiplexer MUX1 is used to receive the first multiplexing control signal Smux1.

[0067] The control terminal of each first switch Q1 is used to receive the first switch control signal Sq1. The first terminal of each first switch Q1 is grounded through the photodiode D1 of the corresponding detection unit. The second terminal of each first switch Q1 is connected to the first common node of the second terminal of the first capacitor Cs and the first terminal of the second capacitor Cc of the detection unit. The first common node is connected to the integration circuit of the detection unit.

[0068] Please see Figure 5 , Figure 5 A schematic diagram illustrating the division of the touch area in the display panel according to an embodiment of the present disclosure is shown.

[0069] For example, such as Figure 5 As shown, in this embodiment of the present disclosure, the touch area in the display panel can be divided into multiple pixel units, each pixel unit including N connected pixels, where N≥1, and each pixel unit corresponds to each switching unit.

[0070] In one example, such as Figure 5 , Figure 4 As shown, with Figure 5 Taking any pixel unit as an example, the pixel unit includes pixels 1 to N. The first selection terminal of the first multiplexer MUX1 in the switching unit corresponding to the pixel unit is connected to pixel 1 of the pixel unit. The second selection terminal of the first multiplexer MUX1 is grounded. The common output terminal of the first multiplexer MUX1 is connected to the first terminal of the first capacitor Cs of the corresponding detection unit. The control terminal of the first multiplexer MUX1 is used to receive the first multiplexing control signal Smux1.

[0071] In one possible implementation, under the touch detection mode, each first multiplexer control signal Smux1 controls each first multiplexer MUX1 to connect to the corresponding pixel, and each first switch control signal Sq1 controls each first switch Q1 to disconnect.

[0072] This embodiment utilizes first multiplexer signals Smux1 to control first multiplexers MUX1 to connect to corresponding pixels, and first switches Sq1 to control first switches Q1 to disconnect. This allows the optical fingerprint chip 20 to operate in the touch detection mode. In touch detection mode, the photodiode D1 of each detection unit is bypassed, and the first terminal of the first capacitor Cs of each detection unit is connected to the corresponding pixel through the first multiplexer MUX1. Thus, the first capacitor Cs and the second capacitor Cc can reflect the touch status of the corresponding pixel. That is, the capacitance values ​​of the first capacitor Cs and the second capacitor Cc corresponding to the touch situation are different from those corresponding to the non-touch situation, causing the voltage connected to the integration circuit to change. By integrating the voltages and outputting them, and using a preset touch threshold, it can be determined whether a touch has occurred, such as whether it is within the preset range of the touch threshold. If so, it can be determined that a touch has occurred. In this way, this embodiment can improve the accuracy of touch judgment.

[0073] In one possible implementation, in the fingerprint acquisition mode, each first multiplexer control signal Smux1 controls each first multiplexer MUX1 to connect to ground, and each first switch control signal Sq1 controls each first switch Q1 to turn on.

[0074] In this embodiment, the optical fingerprint chip 20 can be controlled to operate in the fingerprint acquisition mode by controlling the connection of each first multiplexer MUX1 to ground through each first multiplexer control signal Smux1 and controlling the conduction of each first switch Q1 through each first switch control signal Sq1. In the fingerprint acquisition mode, the photodiode D1 of each detection unit is connected to the circuit, and the first terminal of the first capacitor Cs of each detection unit is grounded (forming a configuration as shown). Figure 3 (As shown in the structure), if the light source of the display panel is turned on, the photodiode D1 will generate a photocurrent. The first capacitor Cs and the second capacitor Cc can react to this current change, enabling subsequent components to acquire a fingerprint image. The fingerprint acquisition process is not limited in this embodiment; those skilled in the art can refer to relevant technologies for implementation.

[0075] Of course, the embodiments disclosed herein can further save power consumption in touch detection mode and improve signal-to-noise ratio and sensitivity. The following are exemplary descriptions of possible implementation methods.

[0076] Please see Figure 6 , Figure 6 A schematic diagram of a fingerprint detection device according to an embodiment of the present disclosure is shown.

[0077] In one possible implementation, such as Figure 6As shown, each switching unit may further include a second multiplexer MUX2 and multiple second switches Q2, wherein,

[0078] The first common node of each switching unit is connected to each selection terminal of the second multiplexer MUX2. The common output terminal of the second multiplexer MUX2 is connected to the integration circuit of the first detection unit. The control terminal of the second multiplexer MUX2 is used to receive the second multiplexing control signal Smux2. The first detection unit can be any one of the multiple detection units.

[0079] The first common node of all other detection units except the first detection unit is connected to the corresponding integration circuit through the first terminal of the second switch Q2 and the second terminal of the second switch Q2. The control terminal of the second switch Q2 is used to receive the control signal Sq2 of the second switch Q2.

[0080] By setting a second multiplexer MUX2 and multiple second switches Q2 in the switching unit, the present invention can detect the voltage change of any pixel in the pixel unit, and bypass the detection units corresponding to other pixels, thereby further reducing power consumption. Furthermore, by detecting multiple pixel units separately and using the output voltage VOUT corresponding to multiple pixel units to determine whether a touch has occurred, the signal-to-noise ratio and sensitivity can be improved.

[0081] Of course, the embodiments disclosed herein are not limited to acquiring only the changes of a single pixel. Those skilled in the art can set an appropriate number according to actual conditions and needs. For example, K pixels can be arbitrarily selected from N pixels, where K is less than N. Correspondingly, only K multiplexers need to be set, and reference should be made to... Figure 5 The setup shown only requires ensuring that each multiplexer connects to a different pixel.

[0082] In one example, in each switching unit, the sum of the number of the second multiplexer MUX2 and the number of multiple second switches Q2 can be greater than or equal to the number of detection units of that switching unit.

[0083] In one possible implementation, under the touch detection mode, each first multiplexer Smux1 controls each first multiplexer MUX1 to connect to the corresponding pixel, each first switch control signal Sq1 controls each first switch Q1 to disconnect, each second switch Q2 control signal Sq2 controls each second switch Q2 to disconnect, and the second multiplexer Smux2 controls the second multiplexer MUX2 to select any one of the first common nodes to connect to the integration circuit of the first detection unit.

[0084] In this embodiment, each first multiplexer MUX1 is connected to a corresponding pixel via a first multiplexer control signal Smux1, each first switch Q1 is turned off via a first switch control signal Sq1, each second switch Q2 is turned off via a second switch control signal Sq2, and the second multiplexer MUX2 is selected by a second multiplexer control signal Smux2 to connect any one of the first common nodes to the integration circuit of the first detection unit. This allows the optical fingerprint chip 20 to operate in the touch detection mode. In touch detection mode, the photodiode D1 of each detection unit is bypassed, and the first terminal of the first capacitor Cs of each detection unit is connected to the corresponding pixel via the first multiplexer MUX1. The pixels are such that the first capacitor Cs and the second capacitor Cc can reflect the touch status of the corresponding pixels. That is, the capacitance values ​​of the first capacitor Cs and the second capacitor Cc are different when a touch occurs and when no touch occurs. The change value of any pixel is input to the integration circuit through a second multiplexer MUX2, or the change values ​​of any two or more pixels are input to the corresponding integration circuit through two or more second multiplexers MUX2, causing the voltage connected to the integration circuit to change. After integrating the voltages, the output is used to determine whether a touch has occurred by using a preset touch threshold. In addition, the other detection units except the first detection unit are bypassed by each second switch Q2 to save power consumption.

[0085] In one possible implementation, in the fingerprint acquisition mode, each of the first multiplexing control signals Smux1 controls each of the first multiplexers MUX1 to connect to ground, each of the first switch control signals Sq1 controls each of the first switches Q1 to turn on, each of the second switch Q2 control signals Sq2 controls each of the second switches Q2 to turn on, and the second multiplexing control signal Smux2 controls the second multiplexer MUX2 to select the first common node of the first detection unit to connect to the integration circuit of the first detection unit.

[0086] In this embodiment, each first multiplexer MUX1 is connected to ground via a first multiplexer control signal Smux1, each first switch Q1 is turned on via a first switch control signal Sq1, each second switch Q2 is turned on via a second switch Q2 control signal Sq2, and the second multiplexer MUX2 is selected by the second multiplexer control signal Smux2 to connect the first common node of the first detection unit to the integration circuit of the first detection unit. This allows the optical fingerprint chip 20 to operate in the fingerprint acquisition mode. In this mode, the photodiode D1 of each detection unit is connected to the circuit, and the first terminal of the first capacitor Cs of each detection unit is grounded (forming a configuration as shown). Figure 3(As shown in the structure), when the light source of the display panel is turned on, the photodiode D1 will generate a photocurrent. The first capacitor Cs and the second capacitor Cc can then react to this current change, enabling subsequent components to acquire a fingerprint image. The fingerprint acquisition process is not limited in this embodiment; those skilled in the art can refer to relevant technologies for implementation.

[0087] Please see Figure 7 , Figure 7 A schematic diagram of a fingerprint detection device according to an embodiment of the present disclosure is shown.

[0088] In one possible implementation, such as Figure 7 As shown, the device may further include:

[0089] Control module 30, connected to switching module 10 and optical fingerprint chip 20, can be used for:

[0090] When the optical fingerprint chip 20 is working in the touch detection mode, it acquires the integration results of each integration circuit at a preset period, and determines whether a touch has occurred based on the integration results and a preset touch threshold.

[0091] When the integration result reaches the preset touch threshold, a touch is determined to have occurred. The working mode of the optical fingerprint chip 20 is switched to the fingerprint acquisition mode, and the light source component is turned on. After a preset delay, the fingerprint is acquired using the optical fingerprint chip 20.

[0092] By setting the control module 30, this embodiment of the present disclosure can acquire the integration results of each integration circuit at a preset period when the optical fingerprint chip 20 is working in the touch detection mode, and determine whether a touch has occurred based on the integration results and a preset touch threshold; if the integration results reach the preset touch threshold, it is determined that a touch has occurred, the working mode of the optical fingerprint chip 20 is switched to the fingerprint acquisition mode, the light source component is turned on, and after a preset delay, the fingerprint is acquired using the optical fingerprint chip 20, thereby saving the fingerprint acquisition process, improving the response speed, and saving system resources.

[0093] In one example, the control module 30 can also output a first multiplex control signal Smux1, a second multiplex control signal Smux2, a first switch control signal Sq1, and a second switch control signal Sq2 to control the working mode of the optical fingerprint chip 20 to the fingerprint acquisition mode or the touch detection mode.

[0094] For example, such as Figure 4As shown, the control module 30 can control each first switch Q1 to be turned on through each first switch control signal Sq1, and can control the optical fingerprint chip 20 to work in the fingerprint acquisition mode. It can also control each first multiplexer MUX1 to be connected to ground through each first multiplexer control signal Smux1, and control each first switch Q1 to be turned on through each first switch control signal Sq1, so as to control the optical fingerprint chip 20 to work in the fingerprint acquisition mode.

[0095] For example, such as Figure 6 As shown, the control module 30 can also control each first multiplexer MUX1 to connect to the corresponding pixel via each first multiplexing control signal Smux1, control each first switch Q1 to open via each first switch control signal Sq1, control each second switch Q2 to open via each second switch Q2 control signal Sq2, and control the second multiplexer MUX2 to select any first common node to connect to the integration circuit of the first detection unit via the second multiplexing control signal Smux2, thereby controlling the optical fingerprint chip 20 to operate in the touch detection mode; alternatively, it can control each first multiplexer MUX1 to connect to ground via each first multiplexing control signal Smux1, control each first switch Q1 to turn on via each first switch control signal Sq1, control each second switch Q2 to turn on via each second switch Q2 control signal Sq2, and control the second multiplexer MUX2 to select the first common node of the first detection unit to connect to the integration circuit of the first detection unit via the second multiplexing control signal Smux2, thereby controlling the optical fingerprint chip 20 to operate in the fingerprint acquisition mode.

[0096] This disclosure does not limit the implementation of the control module 30. Exemplarily, the control module 30 can be implemented by a processing component. In one example, the processing component includes, but is not limited to, a separate processor, discrete components, or a combination of a processor and discrete components. The processor may include a controller in an electronic device with instruction execution capabilities. The processor can be implemented in any suitable manner, for example, by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components. Within the processor, the executable instructions can be executed by hardware circuits such as logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers.

[0097] The embodiments disclosed herein do not limit the specific implementation of the light source component. For example, the light source component can be a backlight of a display panel (such as a liquid crystal display panel) or a display module (such as a self-emissive display panel). The specific size of the preset duration is not limited, and those skilled in the art can set it according to actual conditions and needs.

[0098] This embodiment of the present disclosure uses a switching module 10 to switch the optical fingerprint chip 20 between touch detection mode and fingerprint acquisition mode. When the optical fingerprint chip 20 is working in touch detection mode, it detects whether the display panel is touched. If a touch is detected, the working mode of the optical fingerprint chip 20 is switched to fingerprint acquisition mode, and the display module or light source module can be notified directly via the on-chip bus. After a preset delay, image acquisition begins directly. After image acquisition is completed, the system is notified to retrieve the data, completing the complete acquisition process. In the touch detection mode, this embodiment of the present disclosure only needs to acquire the charge of a local area once at certain intervals. For N connected pixels, only one data point needs to be acquired, and several sub-regions need to be acquired. It is not necessary to acquire the entire touch area, thereby further reducing power consumption and process complexity. It does not rely on other sensors or require multiple system interventions, saving system resources. Furthermore, the response speed is greatly improved, and power consumption is significantly optimized.

[0099] According to another aspect of this disclosure, a fingerprint chip is provided, the fingerprint chip including the fingerprint detection device described above.

[0100] According to another aspect of this disclosure, a display device is provided, including the fingerprint chip.

[0101] According to another aspect of this disclosure, an electronic device is provided, including the aforementioned display device.

[0102] According to another aspect of this disclosure, an electronic device is provided, comprising any one of a display, smartphone, smartwatch, smart bracelet, tablet computer, laptop computer, all-in-one computer, access control device, and electronic door lock.

[0103] For example, the electronic devices in this embodiment include, but are not limited to, desktop computers, televisions, mobile devices with large screens such as mobile phones and tablets, and other common electronic devices that require multiple chips to be cascaded together to achieve driving.

[0104] For example, electronic devices can also be user equipment (UE), mobile devices, user terminals, terminals, handheld devices, computing devices, or in-vehicle devices, etc. Examples of terminals include: displays, smartphones or portable devices, mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and wireless terminals in vehicle-to-everything (V2X) networks, etc. For example, a server can be a local server or a cloud server.

[0105] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the scope of protection of the present invention, which is determined by the appended claims.

[0106] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0107] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0108] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0109] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A fingerprint detection device, characterized in that, The device, used in a display panel, includes: A switching module, connected to the optical fingerprint chip, is used to switch the operating mode of the optical fingerprint chip between touch detection mode and fingerprint acquisition mode. Specifically, when the optical fingerprint chip operates in the touch detection mode, it is used to detect whether the display panel is touched; when the optical fingerprint chip operates in the fingerprint acquisition mode, it is used to acquire a fingerprint. The optical fingerprint chip includes multiple detection units. Each detection unit includes a photodiode, a first capacitor, a second capacitor, and an integrating circuit. The positive terminal of the photodiode and the first terminal of the first capacitor are grounded. The negative terminal of the photodiode is connected to the second terminal of the first capacitor, the first terminal of the second capacitor, and the first input terminal of the integrating circuit. The second terminal of the second capacitor is connected to other circuits. In the touch detection mode, the photodiodes in each detection unit are bypassed, and the first capacitor and second capacitor of each detection unit are used to detect the touch status of the pixel corresponding to that detection unit. The switching module includes multiple switching units, each including multiple first multiplexers and multiple first switches. Each switching unit is connected to a corresponding detection unit of the optical fingerprint chip. The first selection terminal of each first multiplexer is connected to a corresponding pixel of the display panel, the second selection terminal of each first multiplexer is grounded, and the common output terminal of each first multiplexer is connected to the first terminal of the first capacitor of the corresponding detection unit. The control terminal of each first multiplexer receives a first multiplexing control signal, and the control terminal of each first switch receives a first switch control signal. The first terminal of each first switch is grounded through a photodiode of the corresponding detection unit, and the second terminal of each first switch is connected to a first common node between the second terminal of the first capacitor and the first terminal of the second capacitor of the detection unit. This first common node is connected to the integration circuit of the detection unit. The device further includes a control module, configured to: when the optical fingerprint chip is operating in the touch detection mode, acquire the integration results of each integration circuit at a preset period, determine whether a touch has occurred based on the integration results and a preset touch threshold; if the integration results reach the preset touch threshold, determine that a touch has occurred, switch the operating mode of the optical fingerprint chip to the fingerprint acquisition mode, turn on the light source component, delay for a preset time, and then acquire a fingerprint using the optical fingerprint chip.

2. The apparatus according to claim 1, characterized in that, The switching module is used for: When the optical fingerprint chip is working in the touch detection mode, it is used to determine whether the display panel has been touched. If a touch is determined to have occurred, the working mode of the optical fingerprint chip is switched to the fingerprint acquisition mode so that the optical fingerprint chip can acquire fingerprints.

3. The apparatus according to claim 1, characterized in that, The switching module is used for: When the optical fingerprint chip is working in the fingerprint acquisition mode, if the display panel enters sleep mode or the optical fingerprint chip does not detect a fingerprint for a preset duration, the working mode of the optical fingerprint chip is switched to the touch detection mode.

4. The apparatus according to claim 1, characterized in that, In the touch detection mode, each first multiplex control signal controls each first multiplexer to connect to the corresponding pixel, and each first switch control signal controls each first switch to disconnect. In the fingerprint acquisition mode, each first multiplexer control signal controls the connection of each first multiplexer to ground, and each first switch control signal controls the conduction of each first switch.

5. The apparatus according to claim 1, characterized in that, Each switching unit also includes a second multiplexer and multiple second switches, wherein, The first common node of each switching unit is connected to each selection terminal of the second multiplexer. The common output terminal of the second multiplexer is connected to the integration circuit of the first detection unit. The control terminal of the second multiplexer is used to receive the second multiplexing control signal. The first detection unit can be any one of the multiple detection units. The first common node of all other detection units, excluding the first detection unit, is connected to the corresponding integration circuit through the first terminal and the second terminal of the second switch. The control terminal of the second switch is used to receive the control signal of the second switch.

6. The apparatus according to claim 5, characterized in that, In the touch detection mode, each first multiplex control signal controls each first multiplexer to connect to the corresponding pixel, each first switch control signal controls each first switch to open, each second switch control signal controls each second switch to open, and the second multiplex control signal controls the second multiplexer to select any first common node to connect to the integration circuit of the first detection unit. In the fingerprint acquisition mode, each first multiplexer control signal controls each first multiplexer to connect to ground, each first switch control signal controls each first switch to be turned on, each second switch control signal controls each second switch to be turned on, and the second multiplexer control signal controls the second multiplexer to select the first common node of the first detection unit to be connected to the integration circuit of the first detection unit.

7. The apparatus according to claim 1, characterized in that, The display panel includes at least one of the following: liquid crystal display panel, micro light-emitting diode display panel, light-emitting diode display panel, mini light-emitting diode display panel, quantum dot light-emitting diode display panel, organic light-emitting diode display panel, cathode ray tube display panel, digital light processing display panel, field emission display panel, plasma display panel, electrophoretic display panel, electrowetting display panel, and small-pitch display panel.

8. A fingerprint chip, characterized in that, The fingerprint chip includes the fingerprint detection device as described in any one of claims 1 to 7.

9. A display device, characterized in that, Includes the fingerprint chip as described in claim 8.

10. An electronic device comprising the display device of claim 9.

11. The electronic device according to claim 10, characterized in that, The electronic device includes any one of a display, smartphone, smartwatch, smart bracelet, tablet, laptop, all-in-one computer, access control device, and electronic door lock.

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