Fingerprint sensing device, fingerprint reading circuit and touch display panel

Abstract

A fingerprint sensing device, a fingerprint readout circuit, and a touch display panel. The fingerprint sensing device includes multiple fingerprint sensors and a fingerprint readout circuit. The fingerprint sensors can be configured to operate in a fingerprint sensing cycle. The fingerprint readout circuit can be coupled to the multiple fingerprint sensors via multiple sensing lines. The fingerprint readout circuit can be configured to control the fingerprint sensors to operate in a fingerprint sensing cycle. The fingerprint sensing cycle includes an initialization period, an exposure period, and a readout period. The voltage of a reset node in each of the multiple fingerprint sensors is reset to a first voltage during the reset period after the fingerprint sensing cycle ends. The voltage of the reset node in each fingerprint sensor is initialized to an initial voltage during the initialization period. The initial voltage is different from the first voltage.

Description

Technical Field

[0001] The present disclosure relates to fingerprint sensing; in particular, the present disclosure relates to a fingerprint sensing device, a fingerprint reading circuit, and a touch display panel. Background Art

[0002] Fingerprint recognition is a commonly used security protection technology. To reduce the size of electronic products and increase convenience, optical fingerprint sensor arrays are often integrated into touch display panels. However, due to the in-display fingerprint sensor structure, the residual voltage in the fingerprint sensor circuit performing the fingerprint sensing cycle may affect the display common electrode used as the touch sensing electrode, resulting in the touch sensing data obtained in one or more touch display frame periods after the fingerprint sensing frame period being higher or lower than the expected touch sensing data obtained in the touch display frame period away from the fingerprint sensing frame period. In other words, after the fingerprint sensing frame period, the touch sensing data can only return to the expected regular value after several touch display frame periods. The consequence of this phenomenon is an increase in the error rate of touch position detection and a decrease in user experience. Summary of the Invention

[0003] The present disclosure relates to a fingerprint sensing device, a fingerprint reading circuit, and a touch display panel, and more particularly to a fingerprint sensing device, a fingerprint reading circuit, and a touch display panel with an embedded in-display fingerprint sensor structure to improve the accuracy of touch sensing data.

[0004] In the present disclosure, the fingerprint sensing device includes multiple fingerprint sensors and a fingerprint readout circuit. The fingerprint sensors may be configured to operate in a fingerprint sensing cycle. The fingerprint readout circuit may be coupled to the multiple fingerprint sensors via multiple sensing lines. The fingerprint readout circuit may be configured to control the fingerprint sensors to operate in the fingerprint sensing cycle. The fingerprint sensing cycle includes an initialization period, an exposure period, and a readout period. The voltage of a reset node in each of the multiple fingerprint sensors is reset to a first voltage during the reset period after the fingerprint sensing cycle ends. The voltage of the reset node in each fingerprint sensor is initialized to an initial voltage during the initialization period. The initial voltage is different from the first voltage.

[0005] In the present disclosure, the fingerprint sensing circuit can be configured to be coupled to a touch display panel. The touch display panel may include a plurality of fingerprint sensors arranged in an array and an array gate circuit. The fingerprint sensing circuit may be coupled to the plurality of fingerprint sensors via a plurality of sensing lines. The fingerprint sensing circuit may be coupled to the array gate circuit. The fingerprint sensing circuit may be configured to output at least one start pulse signal and at least one clock signal to control the array gate circuit to output a reset signal and a select signal. The reset signal and the select signal may be configured to control at least one fingerprint sensing area of ​​the plurality of fingerprint sensors arranged in the array to operate in a fingerprint sensing cycle. The fingerprint sensing cycle may include an initialization period, an exposure period, and a readout period. Based on the reset signal, the voltage of the reset node in each of the plurality of fingerprint sensors may be reset to a first voltage during the reset period after the fingerprint sensing cycle ends. The voltage of the reset node in each fingerprint sensor may be initialized to an initial voltage during the initialization period. The initial voltage is different from the first voltage.

[0006] In the present disclosure, the touch display panel may include multiple sensing lines and multiple fingerprint sensors. The multiple fingerprint sensors may be configured to operate in a fingerprint sensing cycle. The multiple fingerprint sensors may be coupled to a fingerprint readout circuit via the sensing lines. The fingerprint sensing cycle includes an initialization period, an exposure period, and a readout period. The voltage of a reset node in each of the multiple fingerprint sensors may be reset to a first voltage during the reset period after the fingerprint sensing cycle ends. The voltage of the reset node in each fingerprint sensor may be initialized to an initial voltage during the initialization period. The initial voltage is different from the first voltage.

[0007] Based on the above, according to the fingerprint sensing device, fingerprint readout circuit, and touch display panel disclosed herein, a reset period is arranged after the fingerprint sensing cycle to reset the voltage of the reset node of the fingerprint sensor. As a result, touch sensing data becomes more accurate, thereby reducing the error rate of touch position detection and improving the user experience.

[0008] To make the above content easier to understand, several embodiments accompanied by the accompanying drawings will be described in detail below. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

[0010] Figure 1 FIG. 1 is a schematic diagram of a fingerprint sensing device according to an embodiment of the present disclosure.

[0011] Figure 2 is a schematic diagram of a fingerprint sensor according to one embodiment of the present disclosure.

[0012] Figure 3 is a schematic timing diagram of a fingerprint sensor according to one embodiment of the present disclosure.

[0013] Figure 4 is a schematic timing diagram of a fingerprint sensor according to one embodiment of the present disclosure.

[0014] Figure 5 is a schematic diagram of a fingerprint sensor array according to one embodiment of the present disclosure.

[0015] Figure 6 is a schematic timing diagram of a fingerprint sensor array according to one embodiment of the present disclosure.

[0016] Figure 7 is a schematic timing diagram of a fingerprint sensor array according to one embodiment of the present disclosure.

[0017] Figure 8 FIG. 1 is a schematic diagram of a touch display panel including a fingerprint sensor array according to an embodiment of the present disclosure.

[0018] Figure 9 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to the first embodiment of the present disclosure.

[0019] Figure 10 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to a second embodiment of the present disclosure.

[0020] Figure 11 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to a third embodiment of the present disclosure.

[0021] Figure 12 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to a fourth embodiment of the present disclosure.

[0022] Figure 13 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to a fifth embodiment of the present disclosure.

[0023] Figure 14 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to a sixth embodiment of the present disclosure.

[0024] Figure 15 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to a seventh embodiment of the present disclosure.

[0025] Figure 16 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to an eighth embodiment of the present disclosure.

[0026] Figure 17 is a schematic diagram of a fingerprint reading circuit according to an embodiment of the present disclosure.

[0027] Figure 18 is a schematic diagram of a touch display panel according to an embodiment of the present disclosure.

[0028] [Explanation of Symbols]

[0029] 100: Fingerprint sensing device

[0030] 110, 200, 510, 810, 1721, 1810: Fingerprint sensor

[0031] 120, 1700, 1830: Fingerprint reading circuit

[0032] 130, 1740, 1820, SO1, SO2, SOn: sensing lines

[0033] 300, 400, 600, 700, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600: Timing diagram

[0034] 500: Fingerprint sensor array

[0035] 800, 1710, 1800: Touch display panel

[0036] 820: Pixels

[0037] 1720: Sensor Array

[0038] 1730: Array top gate circuit

[0039] C1: First capacitor

[0040] C2: Second capacitor

[0041] C3: The third capacitor

[0042] CLK: clock signal

[0043] Cycle 1: The first fingerprint sensing cycle

[0044] Cycle2: Second fingerprint sensing cycle

[0045] CycleN: Nth fingerprint sensing cycle

[0046] DP+TP: touch display frame period

[0047] F601, F602, F603, F701, F702, F901, F902, F903, F904, F905, F906, F907, F1001, F1002, F1003, F1004, F1005, F1006, F1007, F1008, F1009, F1010, F1011, F1101, F1102, F1103, F1104, F1105, F1106, F1107, F1108, F1109, F1110, F1111, F 1112, F1113, F1201, F1202, F1203, F1204, F1205, F1206, F1207, F1208, F1301, F1302, F1303, F1304, F1305, F1401, F1402, F1403, F1404, F1405, F1406, F1407, F1501, F1502, F1503, F1504, F1505, F1601, F1602, F1603, F1604, F1605: frame period

[0048] FPR: Fingerprint sensing frame period / fingerprint period

[0049] FZ1, FZ2, FZ3, FZ4: Fingerprint sensing area

[0050] GD1, GD2, GDn: Display scan lines

[0051] GS1, GS2, GSn: reset lines

[0052] M1: Reset switch

[0053] M2: Source follower

[0054] M3: Selector switch

[0055] M4: Pixel switch

[0056] Output, T1, T2, Tn, TP1, TP2, TPn: Output terminals

[0057] P: Reset node

[0058] P_EXP: Exposure period

[0059] P_INIT: Initialization cycle

[0060] P_READ: Read cycle

[0061] P_RST: Reset period

[0062] Row1_M1, Row1_M3, Row2_M1, Row2_M3, RowN_M1, RowN_M3, VM1, VM3, Vsig: voltage signal

[0063] RST: reset signal

[0064] S1: Light sensor

[0065] SD1, SD2, SDn: display data lines

[0066] SEL: Select signal

[0067] SF1, SF2, SFn: fingerprint scanning lines

[0068] SIM: control signal

[0069] STV, STV1, STV2, STV3, STV4: start pulse signal

[0070] Sync: Mode signal

[0071] t301, t302, t303, t304, t305, t306, t401, t402, t403, t404, t405, t406, t6 01, t602, t603, t604, t701, t702, t703, t901, t902, t903, t904, t905, t906, t907, t908, t1001, t1002, t1003, t1004, t1005, t1006, t1007, t1008, t1009 ,t1010,t1011,t1012,t1101,t1102,t1103,t1104,t1105,t1106,t1107,t1 108, t1109, t1110, t1111, t1112, t1113, t1114, t1201, t1202, t1203, t1204 ,t1205,t1206,t1207,t1208,t1209,t1301,t1302,t1303,t1304,t1305,t1 306, t1401, t1402, t1403, t1404, t1405, t1406, t1407, t1408, t1501, t1502, t1503, t1504, t1505, t1506, t1601, t1602, t1603, t1604, t1605, t1606: time

[0072] Vbias: bias voltage

[0073] Vcom: Block

[0074] VDD: operating voltage

[0075] VP: voltage

[0076] VR: Residual voltage

[0077] ΔV: voltage change DETAILED DESCRIPTION

[0078] Reference will now be made in detail to exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like components.

[0079] Throughout the specification and claims of this disclosure, certain terms are used to refer to specific components. Those skilled in the art will appreciate that electronic device manufacturers may use different names to refer to the same component. This document is not intended to distinguish between components that have the same function but different names. In the following description and claims, terms such as "comprise" and "include" are open-ended and should be interpreted as meaning "including, but not limited to..."

[0080] The term "coupling" (or connection) used throughout the entire specification of this application (including the appended claims) may refer to any direct or indirect connection method. For example, if the text states that a first device is coupled (or connected) to a second device, it should be interpreted that the first device can be directly connected to the second device, or the first device can be indirectly connected to the second device through other devices or certain connection methods. The terms "first", "second" and similar terms mentioned throughout the entire specification of this application (including the appended claims) are only used to name discrete elements or to distinguish different embodiments or scopes. Therefore, the terms should not be regarded as limiting the upper or lower limit of the number of elements and should not be used to limit the order of arrangement of elements. In addition, whenever possible, elements / components / steps with the same reference numbers in the drawings and embodiments represent the same or similar parts. In different embodiments, the same reference numbers or the same terms may be used to refer to the relevant descriptions of elements / components / steps.

[0081] It should be noted that in the following embodiments, the technical features of several different embodiments may be replaced, recombined, and mixed to create other embodiments without departing from the spirit of the present disclosure. As long as the features of each embodiment do not violate the spirit of the present disclosure or conflict with each other, the embodiments may be mixed and used together.

[0082] Figure 1 FIG is a schematic diagram of a fingerprint sensing device according to an embodiment of the present disclosure. Figure 1 The fingerprint sensing device 100 may include multiple fingerprint sensors 110 as an optical fingerprint sensing array and a fingerprint reading circuit 120. The fingerprint sensing device 100 may be an electronic device having a touch display panel embedded with the optical fingerprint sensing array, such as a mobile phone, a tablet computer, a netbook computer, etc. The fingerprint reading circuit 120 may be implemented by an integrated circuit (IC) used only for fingerprint sensing, or by a multifunctional IC for display driving, touch sensing, and fingerprint sensing. The display common electrode of the touch display panel is used as a self-capacitive type intra-cell touch sensing electrode. The optical fingerprint sensing array and the display pixel array are integrated on the same substrate. The fingerprint sensor 110 can be configured to operate in a fingerprint sensing cycle. The fingerprint reading circuit 120 can be coupled to the multiple fingerprint sensors 110 via multiple sensing lines 130 in the touch display panel. The fingerprint reading circuit 120 can be configured to control the fingerprint sensor 110 to operate in a fingerprint sensing cycle. The fingerprint sensing cycle includes an initialization period, an exposure period, and a readout period. The voltage VP of the reset node P in each of the plurality of fingerprint sensors 110 is reset to a first voltage in a reset period after a fingerprint sensing cycle ends. The voltage VP of the reset node P in each fingerprint sensor 110 is initialized to an initial voltage in an initialization period. The initial voltage is different from the first voltage.

[0083] In one embodiment, the reset node P is a node electrically coupled to the light sensor of the fingerprint sensor 110. The voltage VP of the reset node P is reset to the first voltage after the fingerprint sensing cycle, and thus, the touch sensing data becomes more accurate, thereby reducing the error rate of touch position detection.

[0084] Figure 2 FIG is a schematic diagram of a fingerprint sensor according to an embodiment of the present disclosure. Figure 1 and Figure 2 , Figure 2 The fingerprint sensor 200 in Figure 1is an embodiment of the fingerprint sensor 110 in , but the present disclosure is not limited thereto. The fingerprint sensor 200 may include a light sensor S1, a first capacitor C1, a reset switch M1, a source follower M2 (as a transistor) and a selection switch M3. The light sensor S1 may be configured to sense light during an exposure period. The light sensor S1 may include a first terminal and a second terminal. The first capacitor C1 may include a first terminal and a second terminal. The first terminal of the light sensor S1 and the first terminal of the first capacitor C1 may be electrically coupled to the reset node P. The second terminal of the light sensor S1 and the second terminal of the first capacitor C1 may be electrically coupled to a bias node to receive a bias voltage Vbias. In one embodiment, the bias node may be coupled to a display common electrode. The reset switch M1 may include a first terminal, a second terminal and a control terminal. The source follower M2 may include a first terminal, a second terminal and a control terminal. The selection switch M3 may include a first terminal, a second terminal and a control terminal. The first terminal of the reset switch M1 and the gate (i.e., the control terminal) of the source follower M2 may be electrically coupled to the reset node P. The second terminal of the reset switch M1 and the first terminal of the source follower M2 can be electrically coupled to a power supply node to receive a voltage signal Vsig. The voltage signal Vsig can be generated by the fingerprint sensing circuit 120 and output to the fingerprint sensing array of the touch display panel. The second terminal of the source follower M2 can be electrically coupled to the first terminal of the selection switch M3. The second terminal of the selection switch M3 can be configured to provide a sensed voltage as an output signal at the output terminal Output. When the source follower M2 is turned on, the voltage on the first terminal of the selection switch M3 follows the voltage of the reset node P.

[0085] In one embodiment, when the reset switch M1 is turned on, the reset node P is electrically coupled to a power supply node supplied with a voltage signal Vsig. The voltage signal Vsig is maintained at a first voltage during the reset period. The voltage signal Vsig is maintained at an initial voltage during the initialization period. In one embodiment, the first voltage may be 0V, and the initial voltage may be the operating voltage VDD, but the present disclosure is not limited thereto. In this way, during the initialization period, the voltage VP of the reset node P is reset to the initial voltage, and during the reset period, the voltage VP of the reset node P is initialized to the first voltage. The voltage VP of the reset node P is reset to the first voltage after the fingerprint sensing cycle, and thus the touch sensing data becomes more accurate, thereby reducing the error rate of touch position detection.

[0086] Figure 3 FIG. 1 is a schematic timing diagram of a fingerprint sensor according to an embodiment of the present disclosure. Figures 1 to 3In timing diagram 300, the voltage signal controlling the gate (i.e., control terminal) of reset switch M1 is represented by VM1. The voltage signal controlling the gate (i.e., control terminal) of select switch M3 is represented by VM3. The voltage VP of reset node P is represented by VP. The initialization period of the fingerprint sensing cycle is represented by P_INIT. The exposure period of the fingerprint sensing cycle is represented by P_EXP. The readout period of the fingerprint sensing cycle is represented by P_READ.

[0087] In one embodiment, the fingerprint sensing circuit 120 may sense the sensing voltage of each fingerprint sensor 110 via the corresponding sensing line 130 during a sensing cycle. The sensing voltage follows the voltage VP of the reset node P. The fingerprint sensing circuit 120 may generate a sensing result for each fingerprint sensor 110 based on a voltage change between the initial voltage and the sensing voltage.

[0088] Specifically, the initialization period P_INIT of the fingerprint sensing cycle is from time t301 to time t302. The exposure period P_EXP of the fingerprint sensing cycle is from time t302 to time t304. The readout period P_READ of the fingerprint sensing cycle is from time t304 to the time before time t305. Figure 3 As shown in FIG, the exposure period P_EXP of the fingerprint sensing cycle is considered to be from the falling edge of the voltage signal VM1 to the falling edge of the voltage signal VM3; and on the other hand, the exposure period P_EXP of the fingerprint sensing cycle can be considered to be from the rising edge of the voltage signal VM1 to the rising edge of the voltage signal VM3. More precisely, for each fingerprint sensor 110, when the switch is turned on or off, the fingerprint sensor 110 is immediately Figure 3, and the initialization and readout operations depicted therein. The initialization period P_INIT of another fingerprint sensing cycle is from time t305 to time t306, and the another fingerprint sensing cycle may or may not begin immediately after the end of the previous fingerprint sensing cycle. The readout period P_READ does not refer to the period spent reading sensing signals from only one sensor row, but rather to the completion of the readout operation for the same sensor row in the fingerprint sensing cycle before the initialization operation for the sensor row of the next fingerprint sensing cycle. At time t301, the voltage signal VM1 is configured to switch from a low level to a high level to turn on the reset switch M1. After M1 is turned on, the reset node P is electrically coupled to the power supply node to receive the voltage signal Vsig, and the voltage VP gradually increases toward the voltage signal Vsig by charging the first capacitor C1 during the initialization period P_INIT. In one embodiment, the voltage signal Vsig remains at an initial voltage during the initialization period P_INIT, and the initial voltage may be the operating voltage VDD, but the present disclosure is not limited thereto. At time t302, voltage signal VM1 is configured to switch from a high level to a low level, turning off reset switch M1. Voltage VP is initialized to an initial voltage (operating voltage VDD), and light sensor S1 is configured to sense light during exposure period P_EXP. During exposure period P_EXP, voltage signal Vsig may remain at the initial voltage, while voltage VP gradually decreases. At time t303, voltage signal VM3 is configured to switch from a low level to a high level, turning on select switch M3. After select switch M3 is turned on, the sensed voltage follows voltage VP at reset node P. In other words, voltage VP is provided to output terminal Output as the sensed voltage. Output terminal Output of a column of fingerprint sensor 110 is coupled to sense line 130. Fingerprint sensing circuit 120 senses the sensed voltage of fingerprint sensor 110 (in a column) via sense line 130. At time t304, fingerprint sensing circuit 120 generates a sensing result of fingerprint sensor 110 based on the voltage change ΔV between the initial voltage (operating voltage VDD) and the sensed voltage. In other words, the voltage variation ΔV is the voltage difference between the initial voltage (the voltage VP of the reset node P may reach the initial voltage during the initialization period when M1 is turned on) and the voltage VP of the reset node P when M3 is turned off. In this way, the fingerprint sensing device 100 can realize the fingerprint recognition function based on the sensing result. Figure 3 During the fingerprint sensing cycle, the voltage signal Vsig output to the power supply node remains at the initial voltage, and on the other hand, the voltage signals VM1 and VM3 always have logic state transitions when the voltage signal Vsig remains at the initial voltage.

[0089] Figure 4FIG. 1 is a schematic timing diagram of a fingerprint sensor according to an embodiment of the present disclosure. Figures 1 to 4 Ideally, during the initialization period P_INIT, the reset switch is turned on to initialize fingerprint recognition, so the voltage VP of the reset node P is charged from 0V to the operating voltage VDD. In one embodiment, after a fingerprint sensing cycle, a residual voltage VR may exist due to the residual charge in the first capacitor C1. This may affect the accuracy of the touch sensing data obtained in the touch display frame period after the fingerprint sensing cycle, thereby potentially increasing the error rate of touch position detection. To improve the accuracy of the touch sensing data obtained in the touch display frame period after the fingerprint sensing cycle and reduce the error rate of touch position detection, a reset period P_RST may be provided after the readout period P_READ to clear the residual charge at the reset node P.

[0090] In one embodiment, in the timing diagram 400, the reset period P_RST is from time t405 to time t406 after the readout period P_READ. The initialization period P_INIT (time t401 to time t402), the exposure period P_EXP (time t402 to time t404) and the readout period P_READ (time t404 to time t405) can be referred to. Figure 3 The description of the reset switch M1 is omitted and will not be further described herein. At time t405, the voltage signal VM1 is configured to switch from a low level to a high level to turn on the reset switch M1. After M1 is turned on, the reset node P is electrically coupled to the power supply node to receive the voltage signal Vsig, and the voltage VP gradually decreases toward the voltage signal Vsig by charging the first capacitor C1 during the reset period P_RST. In one embodiment, the voltage signal Vsig remains at a first voltage during the reset period P_RST, and the first voltage may be 0V, but the present disclosure is not limited to this. At time t406, the voltage signal VM1 is configured to switch from a high level to a low level to turn off the reset switch M1, and the voltage VP is reset to a reset voltage (0V) after the read period P_READ. Since the voltage VP is reset to the reset voltage (0V) after the read period P_READ, the residual voltage at the reset node P has less impact on the accuracy of the touch sensing data, and thus the touch sensing data becomes more accurate. This reduces the error rate of touch position detection and improves the user experience. The voltage signal VM1 has a logic state transition only when the voltage signal Vsig remains at an initial voltage (eg, VDD). Figure 3 In comparison, according to Figure 4 In the illustrated embodiment, the voltage signal VM1 may have a logic state transition while the voltage signal Vsig remains at 0V.

[0091] Figure 5 FIG is a schematic diagram of a fingerprint sensor array according to an embodiment of the present disclosure. Figure 1 and Figure 5 , the fingerprint sensor array 500 may include a plurality of fingerprint sensors 510. The fingerprint sensor 510 may refer to Figure 1 The description of the fingerprint sensor 110 is omitted and will not be further described herein. In one embodiment, the fingerprint sensor array 500 may include n rows and n columns, but the present disclosure is not limited thereto. A fingerprint sensor 510 may be arranged at the intersection of each row and each column. The fingerprint sensor 510 may be coupled to a plurality of sense lines SO1 to SOn, a plurality of reset lines GS1 to GSn, and a plurality of fingerprint scan lines (also referred to as select lines) SF1 to SFn. The sense lines SO1 to SOn may be coupled to the fingerprint sensing circuit 120. In one embodiment, the sense lines SO1 to SOn may be coupled to the fingerprint sensing circuit 120 via a plurality of output terminals T1 to Tn, but the present disclosure is not limited thereto. The reset lines GS1 to GSn may be configured to provide a voltage signal to the gate of the reset switch M1 of the fingerprint sensor 510. The fingerprint scan lines SF1 to SFn may be configured to provide a voltage signal to the gate of the select switch M3 of the fingerprint sensor 510. In this manner, the fingerprint sensor array 500 may integrate the plurality of fingerprint sensors 510 to implement fingerprint recognition.

[0092] Figure 6 FIG. 1 is a schematic timing diagram of a fingerprint sensor array according to an embodiment of the present disclosure. Figure 3 、 Figure 5 and Figure 6 In the timing diagram 600, the operating voltage VDD of the voltage signal Vsig may be represented as VDD. Row1_M1 may represent the gate voltage signal of the reset switch M1 of the first row in the fingerprint sensor array 500. Row2_M1 may represent the gate voltage signal of the reset switch M1 of the second row in the fingerprint sensor array 500. RowN_M1 may represent the gate voltage signal of the reset switch M1 of the Nth row in the fingerprint sensor array 500. Row1_M3 may represent the gate voltage signal of the select switch M3 of the first row in the fingerprint sensor array 500. Row2_M3 may represent the gate voltage signal of the select switch M3 of the second row in the fingerprint sensor array 500. RowN_M3 may represent the gate voltage signal of the select switch M3 of the Nth row in the fingerprint sensor array 500.

[0093] In this embodiment, the timing diagram 600 may include multiple fingerprint sensing frame periods FPR. The fingerprint sensing frame period FPR may include a frame period F601, a frame period F602, and a frame period F603. In this embodiment, the initialization period P_INIT may be arranged in the frame period F601. During the fingerprint sensing cycle, the voltage signal Vsig may be maintained at the initial voltage. The voltage signal VM1 at the gate of the reset switch M1 in each row may be switched from a low level to a high level for initializing the fingerprint sensor 510. In addition, the voltage signal VM1 at the gate of the reset switch M1 in each row may be switched from a high level to a low level for exposing the fingerprint sensor 510.

[0094] In this embodiment, the readout period P_READ may be arranged in the frame period F602 . The voltage signal of the gate of the selection switch M3 of each row may be switched from a low level to a high level for reading of the fingerprint sensor 510 .

[0095] In this embodiment, the reset period P_RST may be arranged in the frame period F603. During the reset period P_RST, the voltage signal Vsig may be maintained at the first voltage. The voltage VP of each row of fingerprint sensors 510 may be reset row by row. In other words, the fingerprint sensors 510 may be reset row by row during the reset period P_RST.

[0096] In this way, the reset period P_RST can be arranged in a period after the fingerprint sensing cycle to reset the voltage VP of the reset node P of the fingerprint sensor 510 row by row. As a result, the touch sensing data obtained in the touch display frame period after the fingerprint sensing cycle becomes more accurate. This reduces the error rate of touch position detection and improves the user experience.

[0097] Figure 7 is a schematic timing diagram of a fingerprint sensor array according to an embodiment of the present disclosure. Figures 3 to 7 , in the timing diagram 700, instead of arranging the reset period P_RST separately in a single frame period F603, the reset period P_RST and the read period P_READ may belong to the same frame period F702. Specifically, the reset period P_RST may be arranged at the end of the frame period F702 after the read period P_READ in the frame period F702. In the reset period P_RST, the voltage signal Vsig may be maintained at the first voltage. The voltage VP of the fingerprint sensor 510 of each row may be reset at the same time. In other words, the fingerprint sensor 510 may be reset at the same time in the reset period P_RST. That is, all gates of the fingerprint sensor 510 may be turned on at the same time in the reset period P_RST. The initialization period P_INIT and the read period P_READ may refer to Figure 6 , and will not be described in detail in this article.

[0098] In this way, the reset period P_RST can be arranged in a short period of time after the fingerprint sensing cycle to simultaneously reset the voltage VP of the reset node P of the fingerprint sensor 510. As a result, the touch sensing data obtained in the touch display frame period after the fingerprint sensing cycle becomes more accurate. This reduces the error rate of touch position detection and improves the user experience.

[0099] Figure 8 FIG is a schematic diagram of a touch display panel including a fingerprint sensor array according to an embodiment of the present disclosure. Figure 5 and Figure 8 , a touch display panel 800 may be formed by integrating the fingerprint sensor array 500 with a plurality of pixels 820. That is, the touch display panel 800 may include a plurality of fingerprint sensors 810. The fingerprint sensor 810 may refer to Figure 5 The touch display panel 800 includes a plurality of electrodes (Vcom blocks) used as display common electrodes (Vcom blocks) in the display period and as touch sensing electrodes in the touch sensing period. Figure 8 (not shown), wherein in one touch display frame period, the display period and the touch sensing period are time-divided. In one embodiment, the bias node (Vbias) can be coupled to the display common electrode.

[0100] In this embodiment, each of the pixels 820 may include a pixel switch M4, a second capacitor C2, and a third capacitor C3. The pixel switch M4 may include a first terminal, a second terminal, and a control terminal. The second capacitor C2 may include a first terminal and a second terminal. The third capacitor C3 may include a first terminal and a second terminal. The second terminal of the pixel switch M4 may be electrically coupled to the first terminal of the second capacitor C2 and the first terminal of the third capacitor C3. The second capacitor C2 and the third capacitor C3 are pixel capacitors and storage capacitors, and the second terminal of the second capacitor C2 and the second terminal of the third capacitor C3 are coupled to the display common electrode.

[0101] The touch display panel 800 may further include a plurality of display scan lines GD1 to GDn and a plurality of display data lines SD1 to SDn. The display scan lines GD1 to GDn may be configured to provide a gate drive voltage to the gate (i.e., control terminal) of the pixel switch M4 of each pixel 820. The display data lines SD1 to SDn may be configured to provide a data voltage to the first terminal of the pixel switch M4 of each pixel 820. In one embodiment, the display data lines SD1 to SDn may be coupled to a data drive circuit via a plurality of output terminals TP1 to TPn, but the present disclosure is not limited thereto. In this manner, the touch display panel 800 may integrate the plurality of fingerprint sensors 810 with the plurality of pixels.

[0102] Please note that reference Figure 1 、 Figure 2 and Figure 8The multiple fingerprint sensors 810 arranged in an array may be located in the touch display panel 800. The touch display panel 800 may include a gate-on-array (GOA) circuit for fingerprint sensing control. The fingerprint sensing circuit 120 may output at least one start pulse signal STV and a clock signal CLK to the gate-on-array circuit for fingerprint sensing control. For example, if the fingerprint sensor array is divided into four fingerprint sensing zones FZ1 to FZ4 along the vertical direction (i.e., the fingerprint scanning direction), the fingerprint sensing circuit 120 may provide start pulse signals STV1 to STV4. Furthermore, the GOA circuit for fingerprint sensing control may include four corresponding shift register circuits, each of which may generate a reset signal RST based on one of the start pulse signals STV1 to STV4 and the clock signal CLK. The reset signal RST is then provided to the plurality of reset lines GS1 to GSn connected to one of the fingerprint sensing zones FZ1 to FZ4. In other words, the gate-on-array circuit may output the reset signal RST based on the at least one start pulse signal STV and the clock signal CLK. The reset signal RST can be configured to reset at least one fingerprint sensing area of ​​the arrayed fingerprint sensors 810 row by row during a reset period P_RST. For example, the sensor rows of fingerprint sensing area FZ1 can be reset row by row by the reset signal RST. The reset signal RST transmitted to fingerprint sensing area FZ1 is generated based on the start pulse signal STV1 and the clock signal CLK. The sensor rows of fingerprint sensing area FZ2 can be reset row by row by the reset signal RST. The reset signal RST transmitted to fingerprint sensing area FZ2 is generated based on the start pulse signal STV2 and the clock signal CLK. The sensor rows of fingerprint sensing area FZ3 can be reset row by row by the reset signal RST. The reset signal RST transmitted to fingerprint sensing area FZ3 is generated based on the start pulse signal STV3 and the clock signal CLK. The sensor rows of fingerprint sensing area FZ4 can be reset row by row by the reset signal RST. The reset signal RST transmitted to fingerprint sensing area FZ4 is generated based on the start pulse signal STV4 and the clock signal CLK. That is, the voltage VP of the reset node P of the fingerprint sensor 810 can be reset row by row according to the start pulse signals STV1 to STV4 and the clock signal CLK output from the fingerprint readout circuit 120. It should be noted that both the initial signal (in the initialization period P_INIT) and the reset signal RST (in the reset period P_RST) for initializing the sensor row of each fingerprint sensing area row by row are output to the plurality of reset lines GS1 to GSn.

[0103] In one embodiment, the fingerprint sensing circuit 120 can output at least one start pulse signal STV, a clock signal CLK, and a control signal SIM to an on-array gate circuit for fingerprint sensing control. For example, if the fingerprint sensor array is divided into four fingerprint sensing zones FZ1 to FZ4 along the vertical direction (i.e., the fingerprint scanning direction), the fingerprint sensing circuit 120 can provide the start pulse signals STV1 to STV4 and the control signal SIM. Furthermore, the GOA circuit for fingerprint sensing control can include four corresponding shift register circuits, each of which can generate a reset signal RST based on one of the start pulse signals STV1 to STV4 and the clock signal CLK. The reset signal RST is then provided to the plurality of reset lines GS1 to GSn connected to one of the fingerprint sensing zones FZ1 to FZ4. Furthermore, the shift register circuit can be configured to provide a reset signal RST to one or more of the fingerprint sensing zones FZ1 to FZ4, enabling simultaneous resetting of all sensor rows in the one or more of the fingerprint sensing zones FZ1 to FZ4. This reset signal RST is generated based on the control signal SIM. In other words, the array gate circuit for fingerprint sensing control can output a reset signal RST based on the at least one start pulse signal STV, the clock signal CLK, and the control signal SIM. The reset signal RST can be configured to simultaneously reset at least one fingerprint sensing region of the arrayed fingerprint sensor 810 during a reset period P_RST. For example, the reset signal RST can be configured to simultaneously reset the sensor rows of fingerprint sensing regions FZ1 through FZ4 based on the start pulse signals STV1 through STV4, the clock signal CLK, and the control signal SIM. In other words, the voltage VP of the reset node P of the fingerprint sensor 810 can be simultaneously reset based on the start pulse signal STV, the clock signal CLK, and the control signal SIM of the fingerprint readout circuit 120.

[0104] In one embodiment, the fingerprint sensing circuit 120 can output at least one start pulse signal STV and a clock signal CLK to an on-array gate circuit for fingerprint sensing control. For example, if the fingerprint sensor array is divided into four fingerprint sensing zones FZ1 to FZ4 along the vertical direction (i.e., the fingerprint scanning direction), the fingerprint sensing circuit 120 can provide the start pulse signals STV1 to STV4. Furthermore, the GOA circuit for fingerprint sensing control can include four corresponding shift register circuits, each of which can generate a select signal SEL based on one of the start pulse signals STV1 to STV4 and a clock signal CLK. The select signal SEL is then provided to the plurality of fingerprint scan lines SF1 to SFn connected to one of the fingerprint sensing zones FZ1 to FZ4. In other words, the on-array gate circuit for fingerprint sensing control can output the select signal SEL based on the at least one start pulse signal STV and the clock signal CLK. The select signal SEL can be configured to read the sensed voltage of at least one fingerprint sensing zone of the arrayed fingerprint sensors 810 row by row during a read cycle P_READ (the output of the fingerprint sensor 200). For example, the sensing voltages of the sensor rows in fingerprint sensing zone FZ1 can be read row by row using the select signal SEL. The select signal SEL transmitted to fingerprint sensing zone FZ1 is generated based on the start pulse signal STV1 and the clock signal CLK. The sensing voltages of the sensor rows in fingerprint sensing zone FZ2 can be read row by row using the select signal SEL. The select signal SEL transmitted to fingerprint sensing zone FZ2 is generated based on the start pulse signal STV2 and the clock signal CLK. The select signals SEL transmitted to fingerprint sensing zones FZ3 or FZ4 are generated in a similar manner. In other words, the sensing voltages of the sensor rows of fingerprint sensor 810 can be read row by row based on the start pulse signal STV and the clock signal CLK of the fingerprint readout circuit 120.

[0105] Figure 9 1 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to the first embodiment of the present disclosure. Figures 6 to 9 , the timing diagram 900 may include multiple frame periods F901 to F907. In addition, the timing diagram 900 may include multiple fingerprint sensing frame periods represented by FPR and multiple touch display frame periods represented by DP+TP. In addition, in the timing diagram 900, the mode signal Sync may indicate the mode of the touch display panel 800. When the mode signal Sync is at a high level, the fingerprint sensing function of the touch display panel 800 may be enabled and the display function and touch sensing function of the touch display panel 800 may be disabled. When the mode signal Sync is at a low level, the fingerprint sensing function of the touch display panel 800 may be disabled and the display function and touch sensing function of the touch display panel 800 may be enabled.

[0106] In this embodiment, the frame skipping mode is represented by one touch display frame period DP+TP between two adjacent fingerprint sensing frame periods FPR (or on the other hand, one fingerprint sensing frame period FPR between two adjacent touch display frame periods DP+TP). However, the number of touch display frame periods DP+TP between two adjacent fingerprint sensing frame periods FPR is not limited thereto. Figure 9 As shown, frame periods F901, F903, F905, and F907 may be touch display frame periods DP+TP, and frame periods F902, F904, and F906 may be fingerprint sensing frame periods FPR. Within the fingerprint sensing frame period FPR, the initialization period P_INIT may belong to frame period F902, the readout period P_READ may belong to frame period F904, and the reset period P_RST may belong to frame period F906. In other words, one frame between two consecutive touch display frame periods DP+TP may be arranged for the fingerprint sensing frame period FPR. In other words, the touch display frame periods DP+TP and the fingerprint sensing frame periods FPR may be arranged alternately in timing diagram 900. The operating mode of the touch display panel 800 with this arrangement may be referred to as a "frame skip mode."

[0107] It should be noted that one cycle of the fingerprint sensing cycle can be defined from the initialization period P_INIT to the readout period P_READ. The initialization period P_INIT of the fingerprint sensing cycle can be in a first frame period. The readout period P_READ of the fingerprint sensing cycle can be in a second frame period different from the first frame period. That is, one fingerprint sensing cycle can be defined from frame period F902 to frame period F904. In this embodiment, one touch display frame period DP+TP (frame period F903) is arranged between the frame period F902 to which the initialization period P_INIT of the same fingerprint sensing cycle belongs and the frame period F904 to which the readout period P_READ belongs. However, the number of touch display frame periods between the fingerprint sensing frame period to which the initialization period P_INIT of the same fingerprint sensing cycle belongs and another fingerprint sensing frame period to which the readout period P_READ belongs is not limited thereto. In other words, the time length between the initialization period P_INIT and the readout period P_READ may include one or more frame periods. In the one or more frame periods between the initialization period P_INIT and the readout period P_READ, at least one of the display function and the touch sensing function is enabled and the fingerprint sensing function is disabled.

[0108] In this embodiment, the reset period P_RST may be arranged in the frame period F906. The voltage VP of the reset node P of each fingerprint sensor 810 of the touch display panel 800 may be reset row by row during the reset period P_RST. In this embodiment, before the frame period F906 in which the reset period P_RST is arranged, there is a fingerprint sensing cycle arranged from the frame period F902 to the frame period F904. However, the number of fingerprint sensing cycles arranged before the reset period P_RST is not limited to this.

[0109] Furthermore, in this embodiment, a touch display frame period DP+TP (frame period F905) is arranged between the reset period P_RST (frame period F906) and the readout period P_READ (frame period F904). However, the number of touch display frame periods DP+TP between a fingerprint sensing frame period to which the reset period P_RST belongs and another fingerprint sensing frame period to which the readout period P_READ belongs in the same cycle is not limited thereto and may follow a configured frame skipping pattern. That is, the length of time between the reset period P_RST and the fingerprint sensing cycle may include one or more frame periods. During the one or more frame periods between the reset period P_RST and the fingerprint sensing cycle, at least one of the display function and the touch sensing function is enabled and the fingerprint sensing function is disabled. Furthermore, the fingerprint sensor 810 is reset row by row during the reset period P_RST.

[0110] Figure 10 1 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to a second embodiment of the present disclosure. Figures 8 to 10 , the timing diagram 1000 may include a plurality of frame periods F1001 to F1011.

[0111] In this embodiment, the frame periods F1001 , F1003 , F1005 , F1007 , F1009 , and F1011 may be touch display frame periods DP+TP, and the frame periods F1002 , F1004 , F1006 , F1008 , and F1010 may be fingerprint sensing frame periods FPR.

[0112] In the fingerprint sensing frame period FPR, the reset period P_RST may belong to the frame period F1010. The initialization period P_INIT of the first fingerprint sensing cycle Cycle1 may belong to the frame period F1002, and the readout period P_READ of the first fingerprint sensing cycle Cycle1 may belong to the frame period F1004. The initialization period P_INIT of the second fingerprint sensing cycle Cycle2 may belong to the frame period F1004, and the readout period P_READ of the second fingerprint sensing cycle Cycle2 may belong to the frame period F1006. The initialization period P_INIT of the Nth (e.g., third) fingerprint sensing cycle CycleN may belong to the frame period F1006, and the readout period P_READ of the Nth fingerprint sensing cycle CycleN may belong to the frame period F1008.

[0113] That is, one reset period P_RST can be arranged after N fingerprint sensing cycles. In other words, the voltage VP of the reset node P of each fingerprint sensor 810 of the touch display panel 800 can be reset row by row in the reset period P_RST after N fingerprint sensing cycles. As a result, the touch sensing data obtained in the touch display frame period after the fingerprint sensing cycle becomes more accurate. This reduces the error rate of touch position detection and improves the user experience.

[0114] Furthermore, the read period P_READ of the first fingerprint sensing cycle Cycle1 and the initialization period P_INIT of the second fingerprint sensing cycle Cycle2 can belong to the same frame period F1004. The read period P_READ of the second fingerprint sensing cycle Cycle2 and the initialization period P_INIT of the Nth fingerprint sensing cycle CycleN can belong to the same frame period F1006. In other words, the read period P_READ of one fingerprint sensing cycle and the initialization period P_INIT of the next fingerprint sensing cycle can belong to the same frame period. Therefore, the frame period required for N fingerprint sensing cycles can be reduced.

[0115] Figure 11 1 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to a third embodiment of the present disclosure. Figures 8 to 11 , the timing diagram 1100 may include a plurality of frame periods F1101 to F1113.

[0116] In this embodiment, the frame periods F1101, F1103, F1105, F1107, F1109, F1111 and F1113 may be touch display frame periods DP+TP, and the frame periods F1102, F1104, F1106, F1108, F1110 and F1112 may be fingerprint sensing frame periods FPR.

[0117] In the fingerprint sensing frame period FPR, the reset period P_RST of the first fingerprint sensing cycle Cycle1 may belong to the frame period F1106, and the reset period P_RST of the Nth fingerprint sensing cycle CycleN may belong to the frame period F1112. The initialization period P_INIT of the first fingerprint sensing cycle Cycle1 may belong to the frame period F1102, and the readout period P_READ of the first fingerprint sensing cycle Cycle1 may belong to the frame period F1104. The initialization period P_INIT of the Nth fingerprint sensing cycle CycleN may belong to the frame period F1108, and the readout period P_READ of the Nth fingerprint sensing cycle CycleN may belong to the frame period F1110.

[0118] That is, a reset period P_RST can be arranged after each fingerprint sensing cycle. In other words, the voltage VP of the reset node P of each fingerprint sensor 810 of the touch display panel 800 can be reset row by row during the reset period P_RST after each fingerprint sensing cycle. As a result, the touch sensing data obtained in the touch display frame period after the fingerprint sensing cycle becomes more accurate. This reduces the error rate of touch position detection and improves the user experience.

[0119] Figure 12 1 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to a fourth embodiment of the present disclosure. Figures 8 to 12 , the timing diagram 1200 may include a plurality of frame periods F1201 to F1208.

[0120] In this embodiment, frame periods F1201, F1203, F1204, F1205, and F1207 may be touch display frame periods DP+TP, and frame periods F1202, F1206, and F1208 may be fingerprint sensing frame periods FPR. Within the fingerprint sensing frame period FPR, the reset period P_RST may be included in frame period F1208, the initialization period P_INIT may be included in frame period F1202, and the readout period P_READ may be included in frame period F1206.

[0121] In this embodiment, the frame skipping mode is represented by three touch display frame periods DP+TP between two adjacent fingerprint sensing frame periods FPR. However, the number of touch display frame periods DP+TP between two adjacent fingerprint sensing frame periods FPR is not limited thereto. Figure 12As shown, the three touch display frame periods DP+TP (frame periods F1203 to F1205) can be arranged between two consecutive fingerprint sensing frame periods FPR (frame periods F1202 and F1206). In other words, the time length between the initialization period P_INIT and the readout period P_READ can include one or more frame periods. During the one or more frame periods between the initialization period P_INIT and the readout period P_READ, at least one of the display function and the touch sensing function is enabled and the fingerprint sensing function is disabled.

[0122] In this embodiment, one touch display frame period DP+TP (frame period F1207) is arranged between the reset period P_RST (frame period F1208) and the readout period P_READ (frame period F1206) before the frame period F1208 in which the reset period P_RST is located. However, the number of touch display frame periods DP+TP arranged between the reset period P_RST and the readout period P_READ is not limited to this. In one embodiment, the number of touch display frame periods DP+TP arranged between the reset period P_RST and the readout period P_READ may be the same as the number of touch display frame periods DP+TP arranged between the initialization period P_INIT and the readout period P_READ, but the present disclosure is not limited to this. For example, three touch display frame periods DP+TP may be arranged between the initialization period P_INIT and the readout period P_READ, and three touch display frame periods DP+TP may be arranged between the readout period P_READ and the reset period P_RST.

[0123] Figure 13 1 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to a fifth embodiment of the present disclosure. Figures 8 to 13 , the timing diagram 1300 may include a plurality of frame periods F1301 to F1305.

[0124] In this embodiment, the frame skipping mode is represented by a touch display frame period DP+TP between two adjacent fingerprint sensing frame periods FPR. However, the number of touch display frame periods DP+TP between two adjacent fingerprint sensing frame periods FPR is not limited thereto. Figure 13As shown, frame periods F1301, F1303, and F1305 may be touch display frame periods DP+TP, and frame periods F1302 and F1304 may be fingerprint sensing frame periods FPR. In the fingerprint sensing frame period FPR, the reset period P_RST and the readout period P_READ of the fingerprint sensing cycle may belong to the same frame period F1304. Specifically, the reset period P_RST may be arranged at the end of the frame period F1304 after the readout period P_READ in the frame period F1304. In addition, the fingerprint sensors 810 may be reset simultaneously rather than row by row. Therefore, the time required to reset all fingerprint sensors 810 of the touch display panel 800 may be reduced.

[0125] In this embodiment, the frame skipping mode is represented by one touch display frame period DP+TP between two adjacent fingerprint sensing frame periods FPR (or in another aspect, one fingerprint sensing frame period FPR between two adjacent touch display frame periods DP+TP). However, the number of touch display frame periods DP+TP between two adjacent fingerprint sensing frame periods FPR is not limited thereto. Figure 13 As shown, one touch display frame period DP+TP (frame period F1303 ) is arranged between the fingerprint sensing frame period FPR to which the initialization period P_INIT belongs and the fingerprint sensing frame period FPR (frame period F1304 ) to which the readout period P_READ belongs.

[0126] Figure 14 1 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to a sixth embodiment of the present disclosure. Figures 8 to 14 , the timing diagram 1400 may include a plurality of frame periods F1401 to F1407.

[0127] In this embodiment, the frame skipping mode is characterized by three touch display frame periods DP+TP between two adjacent fingerprint sensing frame periods FPR. However, the number of touch display frame periods DP+TP between two adjacent fingerprint sensing frame periods FPR is not limited thereto. Frame periods F1401, F1403, F1404, F1405, and F1407 may be touch display frame periods DP+TP, and frame periods F1402 and F1406 may be fingerprint sensing frame periods FPR. Within the fingerprint sensing frame period FPR, the reset period P_RST and the readout period P_READ of the fingerprint sensing cycle may belong to the same frame period F1406. Specifically, the reset period P_RST may be arranged at the end of the frame period F1406 after the readout period P_READ within the frame period F1406. Furthermore, the fingerprint sensors 810 may be reset simultaneously, rather than row by row. Consequently, the time required to reset all fingerprint sensors 810 on the touch display panel 800 may be reduced.

[0128] In this embodiment, if there is at least one fingerprint sensing period in addition to the first fingerprint sensing period from frame period F1402 to F1406, the second fingerprint sensing period may start from a fingerprint sensing frame period FPR after the fingerprint sensing frame period FPR (frame period F1402), such as frame period F1406 or frame period F1410 (not shown) (based on the frame skipping mode, three touch display frame periods DP+TP are located between two adjacent fingerprint sensing frame periods FPR), but the present invention is not limited thereto.

[0129] Figure 15 1 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to the seventh embodiment of the present disclosure. Figures 8 to 15 , the timing diagram 1500 may include a plurality of frame periods F1501 to F1505.

[0130] In this embodiment, the frame skipping mode is implemented by three touch display frame periods DP+TP between two adjacent fingerprint sensing frame periods FPR. Frame periods F1501, F1503, and F1505 may be touch display frame periods DP+TP, and frame periods F1502 and F1504 may be fingerprint sensing frame periods FPR. Within the fingerprint sensing frame period FPR, the initialization period P_INIT may be included in frame period F1502, and the readout period P_READ may be included in frame period F1504.

[0131] It should be noted that the reset period P_RST following the readout period P_READ can be arranged in the touch display frame period DP+TP (frame period F1505) following the fingerprint sensing frame period FPR (frame period F1504) to which the readout period P_READ belongs. Furthermore, the multiple fingerprint sensors 810 can be reset row by row in the frame period F1505. That is, after the fingerprint sensing cycle, the multiple fingerprint sensors 810 are reset row by row in the frame period in which at least one of the display function and the touch sensing function is enabled and the fingerprint sensing function is disabled. Figure 16 1 is a schematic timing diagram of a touch display panel including a fingerprint sensor array according to an eighth embodiment of the present disclosure. Figures 8 to 16 , the timing diagram 1600 may include a plurality of frame periods F1601 to F1605.

[0132] In this embodiment, the frame skipping mode is characterized by three touch display frame periods DP+TP between two adjacent fingerprint sensing frame periods FPR. Frame periods F1601, F1603, and F1605 may be touch display frame periods DP+TP, and frame periods F1602 and F1604 may be fingerprint sensing frame periods FPR. The initialization period P_INIT may fall within frame period F1602, and the readout period P_READ may fall within frame period F1604.

[0133] It should be noted that the reset period P_RST after the readout period P_READ can be arranged in the touch display frame period DP+TP (frame period F1605) after the fingerprint sensing frame period FPR (frame period F1604) to which the readout period P_READ belongs. In addition, the multiple fingerprint sensors 810 can be reset simultaneously in the frame period F1505. That is, after the fingerprint sensing cycle, the multiple fingerprint sensors 810 are reset simultaneously in the frame period in which at least one of the display function and the touch sensing function is enabled and the fingerprint sensing function is disabled. Therefore, the time required to reset all fingerprint sensors 810 of the touch display panel 800 can be reduced.

[0134] In addition, unlike the aforementioned frame skip mode, "porch mode" is also an operating mode for fingerprint sensing of the touch display panel 800. A frame period consists of an active display period (in which all horizontal display lines are displayed sequentially) and a porch interval in which no data is displayed. The porch interval is also a vertical blanking interval (VBI). In porch mode, fingerprint sensing operations (such as initialization, readout, and reset after the fingerprint sensing cycle) are performed at porch intervals. It should be noted that the porch interval can be defined as the length of time between the end of the display frame output of the touch display panel 800 and the beginning of the next display frame output of the touch display panel 800. In other words, the entire porch interval can be between two adjacent frame periods. Part of the porch interval is located in the current frame period, and another part of the porch interval is located in the next frame period. The length of the porch interval can be predetermined based on the display refresh rate of the touch display panel 800. When the display refresh rate is variable (which is called a variable refresh rate (VRR)), the length of the porch interval can also be variable.

[0135] In one embodiment, the reset period P_RST and the fingerprint sensing cycle can be performed at an edge interval. The edge interval can be located in two adjacent frame periods. That is, the reset period P_RST and the fingerprint sensing cycle can be arranged in the edge interval between two consecutive touch display frame periods DP+TP.

[0136] During the edge interval, the plurality of fingerprint sensors 810 may be reset row by row in the reset period P_RST. In another embodiment, all rows of the plurality of fingerprint sensors 810 may be reset simultaneously in the reset period P_RST, and the present disclosure is not limited thereto.

[0137] In one embodiment, the fingerprint sensing cycle can be completely executed by multiple first edge intervals. The reset period P_RST can be in the second edge interval after the multiple first edge intervals. In addition, any of the multiple first edge intervals and the second edge interval can be located in two adjacent frame periods. The initialization period P_INIT, exposure period P_EXP and readout period P_READ of the same fingerprint sensing cycle can be arranged in different edge intervals. In another embodiment, the fingerprint sensing cycle and the reset period P_RST after the fingerprint sensing cycle can be completely executed in the long edge interval under the variable refresh rate (VRRI).

[0138] Figure 17 FIG is a schematic diagram of a fingerprint reading circuit according to an embodiment of the present disclosure. Figure 2 、 Figure 8 and Figure 17 The fingerprint sensing circuit 1700 can be configured to be coupled to the touch display panel 1710. The touch display panel may include a plurality of fingerprint sensors 1721 arranged in a sensor array 1720 and an array-on-gate circuit 1730 for fingerprint sensing control. The fingerprint sensing circuit 1700 may be coupled to the plurality of fingerprint sensors 1721 via a plurality of sensing lines 1740. The fingerprint sensing circuit 1700 may be coupled to the array-on-gate circuit 1730. The fingerprint sensing circuit 1700 may be configured to output at least one start pulse signal STV and at least one clock signal CLK to control the array-on-gate circuit 1730 to output a reset signal RST and a select signal SEL. The reset signal RST and the select signal SEL may be configured to control at least one fingerprint sensing region of the fingerprint sensors 1721 arranged in the sensor array 1720 to operate in a fingerprint sensing cycle. The fingerprint sensing cycle may include an initialization period P_INIT, an exposure period P_EXP, and a readout period P_READ. According to the reset signal RST, the voltage VP of the reset node P in each of the fingerprint sensors 1721 may be reset to a first voltage in a reset period P_RST after the fingerprint sensing cycle ends. The voltage VP of the reset node P in each of the fingerprint sensors 1721 may be initialized to an initial voltage in an initialization period P_INIT. The initial voltage is different from the first voltage.

[0139] In one embodiment, the fingerprint sensing circuit 1700 may be configured to output a voltage signal Vsig to the touch display panel 1710. The voltage signal Vsig may be maintained at a first voltage during a reset period P_RST. The voltage signal Vsig may be maintained at an initial voltage during an initialization period P_INIT. The first voltage is different from the initial voltage. For example, the first voltage is 0V, and the initial voltage is the operating voltage VDD (e.g., 4V).

[0140] In one embodiment, the reset node P may be electrically coupled to a power supply node supplied with a voltage signal Vsig.

[0141] In one embodiment, the fingerprint sensing circuit 1700 can output at least one start pulse signal STV and a clock signal CLK to the array gate circuit 1730. The array gate circuit 1730 can output a reset signal RST based on the at least one start pulse signal STV and the clock signal CLK. The reset signal RST can be configured to reset at least one fingerprint sensing region of the fingerprint sensors 1721 arranged in the sensor array 1720 row by row during a reset period P_RST.

[0142] In one embodiment, the fingerprint sensing circuit 1700 can output at least one start pulse signal STV, a clock signal CLK, and a control signal SIM to the array gate circuit 1730. For example, if the fingerprint sensor array is divided into four fingerprint sensing zones FZ1 to FZ4 along the vertical direction (i.e., the fingerprint scanning direction), the fingerprint sensing circuit 120 can provide the start pulse signals STV1 to STV4 and the control signal SIM. Furthermore, the array gate circuit 1730 can include four corresponding shift register circuits, each of which can generate a reset signal RST based on one of the start pulse signals STV1 to STV4 and the clock signal CLK. The reset signal RST is then provided to the plurality of reset lines GS1 to GSn connected to the fingerprint sensing zones FZ1 to FZ4. Furthermore, the shift register circuits can be configured to simultaneously provide the reset signal RST to the fingerprint sensing zones FZ1 to FZ4 based on the control signal SIM. In other words, the array gate circuit 1730 can output the reset signal RST based on the at least one start pulse signal STV, the clock signal CLK, and the control signal SIM. The reset signal RST may be configured to simultaneously reset at least one fingerprint sensing region of the fingerprint sensors 1721 arranged in the sensor array 1720 during the reset period P_RST.

[0143] In one embodiment, the fingerprint sensing circuit 1700 may output at least one start pulse signal STV and a clock signal CLK to the array gate circuit 1730. The array gate circuit 1730 may output a selection signal SEL based on the at least one start pulse signal STV and the clock signal CLK. The selection signal SEL may be configured to read the sensing voltage of at least one fingerprint sensing region of the fingerprint sensors 1721 arranged in the sensor array 1720 row by row during a read cycle P_READ.

[0144] In this way, the reset period P_RST can be arranged after the fingerprint sensing cycle to reset the voltage VP of the reset node P of the fingerprint sensor 1721. As a result, the touch sensing data obtained in the touch display frame period after the fingerprint sensing cycle becomes more accurate, thereby reducing the error rate of touch position detection and improving the user experience.

[0145] Figure 18 FIG is a schematic diagram of a touch display panel according to an embodiment of the present disclosure. Figure 2 、 Figure 8 and Figure 18 The touch display panel 1800 may include a plurality of sensing lines 1820 and a plurality of fingerprint sensors 1810. The plurality of fingerprint sensors 1810 may be configured to operate in a fingerprint sensing cycle. The plurality of fingerprint sensors 1810 may be coupled to a fingerprint readout circuit 1830 via the sensing lines 1820. The fingerprint sensing cycle includes an initialization period P_INIT, an exposure period P_EXP, and a readout period P_READ. The voltage VP of the reset node P in each of the fingerprint sensors 1810 may be reset to a first voltage in a reset period P_RST after the fingerprint sensing cycle ends. The voltage VP of the reset node P in each fingerprint sensor 1810 may be initialized to an initial voltage in the initialization period P_INIT. The initial voltage is different from the first voltage.

[0146] In one embodiment, the sensing voltage of each fingerprint sensor 1810 (the output of the fingerprint sensor 200) can be read by the fingerprint readout circuit 1830 via the corresponding sensing line 1820. The sensing voltage of each fingerprint sensor 1810 follows the voltage VP of the reset node P. The sensing result of each fingerprint sensor 1810 can be generated by the fingerprint readout circuit 1830 for each fingerprint sensing cycle based on the voltage change between the initial voltage and the sensing voltage.

[0147] In one embodiment, referring to Figure 17 and Figure 18The touch display panel 1800 may further include an array gate circuit 1730 for fingerprint sensing control. The array gate circuit 1730 may receive at least one start pulse signal STV and a clock signal CLK from the fingerprint readout circuit 1830. The array gate circuit 1730 may output a reset signal RST based on the at least one start pulse signal STV and the clock signal CLK. The reset signal RST may be configured to reset at least one fingerprint sensing area of ​​the fingerprint sensors 1810 arranged in the sensor array 1720 row by row during a reset period P_RST.

[0148] In one embodiment, referring to Figure 17 and Figure 18 The touch display panel 1800 may further include an array gate circuit 1730 for fingerprint sensing control. The array gate circuit 1730 may receive at least one start pulse signal STV, a clock signal CLK, and a control signal SIM from the fingerprint readout circuit 1830. The array gate circuit 1730 may output a reset signal RST based on the at least one start pulse signal STV, the clock signal CLK, and the control signal SIM. Based on the control signal SIM, the reset signal RST generated by the array gate circuit 1730 may be configured to simultaneously reset at least one fingerprint sensing region of the fingerprint sensors 1810 arranged in the sensor array 1720 during a reset period P_RST.

[0149] In one embodiment, referring to Figure 17 and Figure 18 The touch display panel 1800 may further include an array gate circuit 1730 for fingerprint sensing control. The array gate circuit 1730 may receive at least one start pulse signal STV and a clock signal CLK from the fingerprint reader circuit 1830. The array gate circuit 1730 may output a selection signal SEL based on the at least one start pulse signal STV and the clock signal CLK. The selection signal SEL may be configured to read the sensed voltage of at least one fingerprint sensing region of the fingerprint sensors 1810 arranged in the sensor array 1720 row by row during a read cycle P_READ. In this embodiment, the fingerprint reader circuit 1830 does not necessarily provide the control signal SIM to the array gate circuit 1730.

[0150] In this way, the reset period P_RST can be arranged after the fingerprint sensing cycle to reset the voltage VP of the reset node P of the fingerprint sensor 1810. As a result, the touch sensing data obtained in the touch display frame period after the fingerprint sensing cycle becomes more accurate, thereby reducing the error rate of touch position detection and improving the user experience.

[0151] In summary, according to the fingerprint sensing device, fingerprint readout circuit, and touch display panel disclosed herein, a reset period is arranged after the fingerprint sensing cycle to reset the voltage of the reset node of the fingerprint sensor. This reduces the error rate of touch position detection and improves the user experience.

[0152] It will be apparent to those skilled in the art that various modifications and variations may be made to the disclosed embodiments without departing from the scope or spirit of the present disclosure. In view of the above, the present disclosure is intended to cover modifications and variations that fall within the scope of the appended claims and their equivalents.

[0153] CROSS-REFERENCE TO RELATED APPLICATIONS

[0154] This application claims the benefit of priority to U.S. Provisional Patent Application Serial No. 63 / 129,612, filed on December 23, 2020. The entirety of the above-mentioned patent application is incorporated herein by reference and constitutes a part of this specification.

Claims

1. A fingerprint sensing device, comprising: a plurality of fingerprint sensors configured to operate in a fingerprint sensing cycle; as well as a fingerprint reading circuit coupled to the plurality of fingerprint sensors via a plurality of sensing lines and configured to control the plurality of fingerprint sensors to operate in the fingerprint sensing cycle, The fingerprint sensing cycle includes an initialization period, an exposure period and a readout period. The voltage of the reset node in each of the plurality of fingerprint sensors is reset to a first voltage in a reset period after the fingerprint sensing cycle ends. The voltage of the reset node in each fingerprint sensor is initialized to an initial voltage during the initialization period, and The initial voltage is greater than the first voltage.

2. The fingerprint sensing device according to claim 1, wherein The fingerprint reading circuit reads out a sensing voltage of each fingerprint sensor via a corresponding sensing line among the plurality of sensing lines during the reading period. wherein the sense voltage follows the voltage of the reset node, and The fingerprint reading circuit generates a sensing result of each fingerprint sensor based on a voltage change between the initial voltage and the sensing voltage.

3. The fingerprint sensing device according to claim 1, wherein the reset node is electrically coupled to a power supply node supplied with a voltage signal, wherein the voltage signal remains at the first voltage during the reset period, and The voltage signal is maintained at the initial voltage during the initialization period. 4 . The fingerprint sensing device according to claim 3 , wherein the fingerprint reading circuit is configured to output the voltage signal to a touch display panel.

5. The fingerprint sensing device according to claim 1, wherein The initialization period of the fingerprint sensing cycle is in the first frame period, The readout period of the fingerprint sensing cycle is in a second frame period different from the first frame period, and The time length between the initialization period and the readout period includes one or more frame periods, In the one or more frame periods between the initialization period and the readout period, at least one of a display function and a touch sensing function is enabled and a fingerprint sensing function is disabled.

6. The fingerprint sensing device according to claim 1, wherein The time length between the fingerprint sensing cycle and the reset period includes one or more frame periods. wherein in the one or more frame periods between the fingerprint sensing cycle and the reset period, at least one of a display function and a touch sensing function is enabled and a fingerprint sensing function is disabled, and The plurality of fingerprint sensors are reset row by row during the reset period.

7. The fingerprint sensing device according to claim 1, wherein The readout period and the reset period of the fingerprint sensing cycle belong to the same frame period, and The multiple fingerprint sensors are reset simultaneously.

8. The fingerprint sensing device according to claim 1, wherein The fingerprint sensing cycle and the reset cycle are performed at edge intervals, and The edge interval is located in two adjacent frame periods. 9 . The fingerprint sensing device according to claim 8 , wherein the plurality of fingerprint sensors are reset row by row in the reset period. 10 . The fingerprint sensing device according to claim 8 , wherein the plurality of fingerprint sensors are reset simultaneously.

11. The fingerprint sensing device according to claim 1, wherein The fingerprint sensing cycle is completely executed by a plurality of first edge intervals, and The reset period is in a second edge interval after the plurality of first edge intervals, Any one of the plurality of first porch intervals and the second porch interval is located in two adjacent frame periods.

12. The fingerprint sensing device according to claim 1, wherein The plurality of fingerprint sensors arranged in an array are located in the touch display panel, and The touch display panel includes an array upper gate circuit, The fingerprint reading circuit outputs at least one starting pulse signal and a clock signal to the array gate circuit, and The array upper gate circuit outputs a reset signal according to the at least one start pulse signal and the clock signal, The reset signal is configured to reset at least one fingerprint sensing area of ​​the plurality of fingerprint sensors arranged in the array row by row during the reset period.

13. The fingerprint sensing device according to claim 1, wherein The plurality of fingerprint sensors arranged in an array are located in the touch display panel, and The touch display panel includes an array upper gate circuit, The fingerprint reading circuit outputs at least one starting pulse signal, a clock signal and a control signal to the array gate circuit, and The array upper gate circuit outputs a reset signal according to the at least one start pulse signal, the clock signal and the control signal, The reset signal is configured to simultaneously reset at least one fingerprint sensing area of ​​the plurality of fingerprint sensors arranged in the array during the reset period.

14. The fingerprint sensing device according to claim 1, wherein The plurality of fingerprint sensors arranged in an array are located in the touch display panel, and The touch display panel includes an array upper gate circuit, The fingerprint reading circuit outputs at least one starting pulse signal and a clock signal to the array gate circuit, and The array upper gate circuit outputs a selection signal according to the at least one start pulse signal and the clock signal, The selection signal is configured to read out the sensing voltage of at least one fingerprint sensing region of the plurality of fingerprint sensors arranged in the array row by row during the readout period.

15. A fingerprint reading circuit capable of being configured to be coupled to a touch display panel, wherein the touch display panel comprises a plurality of fingerprint sensors arranged in an array and an array gate circuit, and The fingerprint readout circuit is coupled to the plurality of fingerprint sensors via a plurality of sensing lines and is coupled to the array gate circuit; and The fingerprint reading circuit is configured to output at least one start pulse signal and at least one clock signal to control the array gate circuit to output a reset signal and a selection signal. wherein the reset signal and the selection signal are configured to control at least one fingerprint sensing area of ​​the plurality of fingerprint sensors arranged in the array to operate in a fingerprint sensing cycle, The fingerprint sensing cycle includes an initialization period, an exposure period, and a readout period, and wherein according to the reset signal, the voltage of the reset node in each of the plurality of fingerprint sensors is reset to a first voltage in a reset period after the fingerprint sensing cycle ends; The voltage of the reset node in each fingerprint sensor is initialized to an initial voltage during the initialization period, and The initial voltage is greater than the first voltage.

16. The fingerprint reading circuit according to claim 15, wherein The fingerprint reading circuit reads out a sensing voltage of each fingerprint sensor via a corresponding sensing line among the plurality of sensing lines during the reading period. wherein the sense voltage follows the voltage of the reset node, and The fingerprint reading circuit generates a sensing result of each fingerprint sensor based on a voltage change between the initial voltage and the sensing voltage.

17. The fingerprint reading circuit according to claim 15, wherein The fingerprint reading circuit is configured to output a voltage signal to the touch display panel, wherein the voltage signal remains at the first voltage during the reset period, and The voltage signal is maintained at the initial voltage during the initialization period. 18 . The fingerprint sensing circuit according to claim 17 , wherein the reset node is electrically coupled to a power supply node supplied with the voltage signal.

19. The fingerprint reading circuit according to claim 15, wherein The initialization period of the fingerprint sensing cycle is in the first frame period, The readout period of the fingerprint sensing cycle is in a second frame period different from the first frame period, and The time length between the initialization period and the readout period includes one or more frame periods, In the one or more frame periods between the initialization period and the readout period, at least one of a display function and a touch sensing function is enabled and a fingerprint sensing function is disabled.

20. The fingerprint reading circuit according to claim 15, wherein The time length between the fingerprint sensing cycle and the reset period includes one or more frame periods. wherein in the one or more frame periods between the fingerprint sensing cycle and the reset period, at least one of a display function and a touch sensing function is enabled and a fingerprint sensing function is disabled, and The plurality of fingerprint sensors are reset row by row during the reset period.

21. The fingerprint reading circuit according to claim 15, wherein The readout period and the reset period of the fingerprint sensing cycle belong to the same frame period, and The multiple fingerprint sensors are reset simultaneously.

22. The fingerprint reading circuit according to claim 15, wherein The fingerprint sensing cycle and the reset cycle are performed at edge intervals, and The edge interval is located in two adjacent frame periods.

23. The fingerprint sensing circuit according to claim 22, wherein the plurality of fingerprint sensors are reset row by row in the reset period.

24. The fingerprint sensing circuit according to claim 22, wherein the plurality of fingerprint sensors are reset simultaneously.

25. The fingerprint sensing circuit according to claim 15, wherein The fingerprint sensing cycle is completely executed by a plurality of first edge intervals, and The reset period is in a second edge interval after the plurality of first edge intervals, Any one of the plurality of first porch intervals and the second porch interval is located in two adjacent frame periods.

26. The fingerprint reading circuit according to claim 15, wherein The fingerprint reading circuit outputs at least one start pulse signal and a clock signal to the array gate circuit, and The array upper gate circuit outputs a reset signal according to the at least one start pulse signal and the clock signal, The reset signal is configured to reset at least one fingerprint sensing area of ​​the plurality of fingerprint sensors arranged in the array row by row during the reset period.

27. The fingerprint reading circuit according to claim 15, wherein The fingerprint reading circuit outputs at least one start pulse signal, a clock signal and a control signal to the array gate circuit, and The array upper gate circuit outputs a reset signal according to the at least one start pulse signal, the clock signal and the control signal, The reset signal is configured to simultaneously reset at least one fingerprint sensing area of ​​the plurality of fingerprint sensors arranged in the array during the reset period.

28. The fingerprint reading circuit according to claim 15, wherein The fingerprint reading circuit outputs at least one start pulse signal and a clock signal to the array gate circuit, and The array upper gate circuit outputs a selection signal according to the at least one start pulse signal and the clock signal, The selection signal is configured to read out the sensing voltage of at least one fingerprint sensing region of the plurality of fingerprint sensors arranged in the array row by row during the readout period.

29. A touch display panel, comprising: Multiple sensing lines; as well as a plurality of fingerprint sensors configured to operate in a fingerprint sensing cycle and coupled to a fingerprint readout circuit via the plurality of sensing lines, The fingerprint sensing cycle includes an initialization period, an exposure period and a readout period. The voltage of the reset node in each of the plurality of fingerprint sensors is reset to a first voltage in a reset period after the fingerprint sensing cycle ends. The voltage of the reset node in each fingerprint sensor is initialized to an initial voltage during the initialization period, and The initial voltage is greater than the first voltage.

30. The touch display panel according to claim 29, wherein The sensing voltage of each fingerprint sensor is read out by the fingerprint reading circuit via the corresponding sensing line among the plurality of sensing lines. wherein the sensing voltage of each fingerprint sensor follows the voltage of the reset node, and The fingerprint reading circuit generates a sensing result of each fingerprint sensor for the fingerprint sensing cycle based on a voltage change between the initial voltage and the sensing voltage.

31. The touch display panel according to claim 29, wherein the reset node is electrically coupled to a power supply node supplied with a voltage signal, wherein the voltage signal remains at the first voltage during the reset period, and The voltage signal is maintained at the initial voltage during the initialization period. 32 . The touch display panel according to claim 31 , wherein the fingerprint sensing circuit is configured to output the voltage signal to the touch display panel.

33. The touch display panel according to claim 29, wherein The initialization period of the fingerprint sensing cycle is in the first frame period, The readout period of the fingerprint sensing cycle is in a second frame period different from the first frame period, and The time length between the initialization period and the readout period includes one or more frame periods, In the one or more frame periods between the initialization period and the readout period, at least one of a display function and a touch sensing function is enabled and a fingerprint sensing function is disabled.

34. The touch display panel according to claim 29, wherein The time length between the fingerprint sensing cycle and the reset period includes one or more frame periods. wherein in the one or more frame periods between the fingerprint sensing cycle and the reset period, at least one of a display function and a touch sensing function is enabled and a fingerprint sensing function is disabled, and The plurality of fingerprint sensors are reset row by row during the reset period.

35. The touch display panel according to claim 29, wherein The readout period and the reset period of the fingerprint sensing cycle belong to the same frame period, and The multiple fingerprint sensors are reset simultaneously.

36. The touch display panel according to claim 29, wherein The fingerprint sensing cycle and the reset cycle are performed at edge intervals, and The edge interval is located in two adjacent frame periods. 37 . The touch display panel according to claim 36 , wherein the plurality of fingerprint sensors are reset row by row in the reset period. The touch display panel according to claim 36 , wherein the plurality of fingerprint sensors are reset simultaneously.

39. The touch display panel according to claim 29, wherein The fingerprint sensing cycle is completely executed by a plurality of first edge intervals, and The reset period is in a second edge interval after the plurality of first edge intervals, Any one of the plurality of first porch intervals and the second porch interval is located in two adjacent frame periods.

40. The touch display panel according to claim 29, further comprising an array upper gate circuit, wherein The array gate circuit receives at least one start pulse signal and a clock signal from the fingerprint reading circuit, and The array upper gate circuit outputs a reset signal according to the at least one start pulse signal and the clock signal, The reset signal is configured to reset at least one fingerprint sensing area of ​​the plurality of fingerprint sensors arranged in an array row by row during the reset period.

41. The touch display panel according to claim 29, further comprising an array upper gate circuit, wherein The array gate circuit receives at least one start pulse signal, a clock signal and a control signal from the fingerprint reading circuit, and The array upper gate circuit outputs a reset signal according to the at least one start pulse signal, the clock signal and the control signal, The reset signal is configured to simultaneously reset at least one fingerprint sensing area of ​​the plurality of fingerprint sensors arranged in an array during the reset period.

42. The touch display panel according to claim 29, further comprising an array upper gate circuit, wherein The array gate circuit receives at least one start pulse signal and a clock signal from the fingerprint reading circuit, and The array upper gate circuit outputs a selection signal according to the at least one start pulse signal and the clock signal, The selection signal is configured to read out the sensing voltage of at least one fingerprint sensing region of the plurality of fingerprint sensors arranged in an array row by row during the readout period.

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