Driving device and driving method for driving touch display panel

Abstract

A driving device and a driving method for driving a touch display panel. The driving device includes a plurality of touch sensing input terminals, a plurality of fingerprint sensing input terminals, a first touch sensing circuit, a fingerprint sensing circuit, and a second touch sensing circuit. The second touch sensing circuit is coupled to a plurality of second touch sensing electrodes in a fingerprint sensor array of the touch display panel through at least a portion of the plurality of fingerprint sensing input terminals. The second touch sensing circuit is configured to perform a second touch sensing operation according to the second touch sensing electrodes in the fingerprint sensor array to compensate for a touch sensing result of a first touch sensing operation performed by the first touch sensing circuit.

Description

Technical Field

[0001] The present disclosure generally relates to a technology for integrating touch sensing operations and fingerprint sensing operations into a touch display panel, and more particularly, to a driving device for driving a touch display panel with a fingerprint sensing function and a driving method for driving a touch display panel with a fingerprint sensing function. Background Art

[0002] An electronic device may use a touch display panel having a display function and a touch function. With the development of technology, it is expected that the electronic device may have a fingerprint recognition function (i.e., a fingerprint sensing function). Therefore, many panel manufacturers are developing how to embed a fingerprint sensor into a touch display panel so that the touch display panel has a fingerprint sensing function. There are many ways to implement the fingerprint sensing function, such as capacitive, optical, ultrasonic fingerprint sensing technology, etc. The technology for touch display panels has advanced to optical fingerprint sensors embedded in the structure of the touch display panel. The optical fingerprint sensor may be referred to as an in-display fingerprint sensor.

[0003] However, since the fingerprint sensor is embedded in the touch display panel, the quality of the analog touch sensing signal sensed in the touch display panel is affected. For example, the fingerprint sensor may occupy a portion of the conductive layer used to form the touch sensing electrode in the touch display panel to reduce the area of ​​the touch sensing electrode. Alternatively, the fingerprint sensor and the touch sensing electrode may be coupled too close to each other, so that the signals in these devices interfere with each other. As a result, the signal strength of the touch sensing signal in the touch display panel becomes smaller, thereby reducing the sensitivity of touch sensing. Summary of the invention

[0004] Therefore, one or more embodiments of the present disclosure provide a driving device for driving a touch display panel with a fingerprint sensing function and a driving method for driving a touch display panel with a fingerprint sensing function. In the embodiments of the present disclosure, a portion of the circuit of the fingerprint sensing array is also used as a touch sensing electrode in a touch sensing cycle to compensate for the touch sensing result of the first touch sensing operation so as to improve the touch sensing accuracy of the touch display panel with a fingerprint sensing function.

[0005] The present disclosure provides a driving device for driving a touch display panel with a fingerprint sensing function. The driving device includes multiple touch sensing input terminals, multiple fingerprint sensing input terminals, a first touch sensing circuit, a fingerprint sensing circuit, and a second touch sensing circuit. The first touch sensing circuit is coupled to multiple first touch sensing electrodes in the touch display panel through multiple touch sensing input terminals, and the first touch sensing circuit is configured to perform a first touch sensing operation. The fingerprint sensing circuit is coupled to a fingerprint sensor array in the touch display panel through multiple fingerprint sensing input terminals, and the fingerprint sensing circuit is configured to perform a fingerprint sensing operation, wherein the first touch sensing operation and the fingerprint sensing operation are performed without overlapping in time. The second touch sensing circuit is coupled to multiple second touch sensing electrodes in the fingerprint sensor array of the touch display panel through at least a portion of the multiple fingerprint sensing input terminals. The second touch sensing circuit is configured to perform a second touch sensing operation according to the second touch sensing electrodes in the fingerprint sensor array to compensate for the touch result of the first touch sensing operation performed by the first touch sensing circuit.

[0006] The present disclosure provides a driving method for a touch panel with a fingerprint sensing function. The touch panel includes a plurality of first touch sensing electrodes and a fingerprint sensor array. The driving method includes the following steps. A first touch sensing operation is performed on a plurality of first touch sensing electrodes in a touch display panel. A fingerprint sensing operation is performed on a fingerprint sensor array in a touch display panel, wherein the first touch sensing operation and the fingerprint sensing operation are performed without overlapping in time. A second touch sensing operation is performed on a plurality of second touch sensing electrodes in a fingerprint sensor array of a touch display panel, wherein the second touch sensing operation performed by the plurality of second touch sensing electrodes in the fingerprint sensor array is used to compensate for a touch sensing result of the first touch sensing operation.

[0007] In order to make the foregoing content more understandable, several embodiments with accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The accompanying drawings are included to provide further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the embodiments, serve to explain the principles of the present disclosure.

[0009] Figure 1 The structure diagram of a touch display panel with or without a fingerprint sensing function in an embodiment.

[0010] Figure 2 is a block diagram of an electronic device having a touch display panel with a fingerprint sensing function in a first embodiment of the present disclosure.

[0011] Figure 3is a block diagram of an electronic device 300 having a touch display panel with a fingerprint sensing function in a second embodiment of the present disclosure.

[0012] Figure 4 Schematic diagram of a touch display panel, a switch circuit of a driving device, and some circuits in a second touch sensing circuit in the first embodiment of the present disclosure.

[0013] Figure 5 is a circuit diagram of a portion of a fingerprint sensor array in a touch display panel in the first embodiment of the present disclosure.

[0014] Figure 6 is the first embodiment of the present disclosure Figure 4 A circuit diagram of a front-end circuit of a second touch sensing circuit in FIG.

[0015] FIG. 7A to FIG. 7C In the first embodiment of the present disclosure Figure 4 Block diagram of different structures of the driving device 210.

[0016] Figure 8 is a schematic diagram presenting a scanning direction of a first touch sensing operation and a scanning direction of a second touch sensing operation in a touch display panel in an implementation of the disclosed embodiment.

[0017] FIG. 9A to FIG. 9C It is used to further describe the embodiments of the present disclosure. Figure 8 Schematic diagram of a first touch sensing operation performed by a first touch sensing circuit and a second touch sensing operation performed by a second sensing circuit.

[0018] Fig.10 : is a schematic diagram showing an area of ​​a fingerprint sensor array arranged in a touch display panel as an example in an embodiment of the present disclosure.

[0019] Fig.11 is a flowchart of a method for driving a touch panel with a fingerprint sensing function in an embodiment of the present disclosure.

[0020] Description of Figure Numbers

[0021] 100: touch display panel;

[0022] 110: touch display panel / glass substrate;

[0023] 120: color filter layer;

[0024] 130: liquid crystal layer;

[0025] 140: common electrode layer / touch sensing electrode layer / thin film transistor layer;

[0026] 160: glass substrate;

[0027] 170: fingerprint sensing circuit;

[0028] 200, 300: electronic devices;

[0029] 210, 310: driving circuit / driving device;

[0030] 211: touch sensing input terminal;

[0031] 212: fingerprint sensing input terminal;

[0032] 213: a first touch sensing circuit;

[0033] 214: a second touch sensing circuit;

[0034] 215, 315: fingerprint sensing circuit;

[0035] 216: switch circuit;

[0036] 217, 218, 219: data processing circuit;

[0037] 220, 220_1, 220_2, 220_2': touch display panel;

[0038] 222: a first touch sensing electrode;

[0039] 224: fingerprint sensor array;

[0040] 225: second touch sensing electrode;

[0041] 230: host device;

[0042] 305: Touch and display driver integrated circuit;

[0043] 420-1~420-18: front-end circuit;

[0044] 410: FPR GOA circuit;

[0045] 430: fingerprint recognition analog front-end circuit;

[0046] 400(1, 1) to 400(18, 32): first touch sensing electrodes;

[0047] 501-1, 501-2, 501-3, 501-4: fingerprint sensor;

[0048] 610: Comparator;

[0049] 620: Capacitor;

[0050] 705: touch position determination circuit;

[0051] 710, 720, 730: adder circuit;

[0052] 810a1, 810a2, 810b: scanning direction;

[0053] ADC1: first analog-to-digital converter;

[0054] ADC2: second analog-to-digital converter;

[0055] AFE1: first AFE circuit;

[0056] AFE2: second AFE circuit;

[0057] Com: common electrode layer;

[0058] DBE, DBE1, DBE2: digital back-end processing circuit;

[0059] G1~G18: switch group;

[0060] RX(1,1)-RX(18,32): first touch sensing data;

[0061] RX'(1,1)-RX'(18,9) second touch sensing data;

[0062] S1110, S1120, S1130, S1140: steps;

[0063] SEL: gate control signal for selecting transistor;

[0064] Sout1, Sout2: fingerprint sensing lines;

[0065] ST, SF: switching elements;

[0066] T0, T1~T8: sensing enable signal;

[0067] TSHD: touch sensing enable signal;

[0068] Vref: reference voltage source;

[0069] X1~X18: columns;

[0070] Y1~Y32: OK. DETAILED DESCRIPTION

[0071] Figure 1 The structure diagram of a touch display panel with or without a fingerprint sensing function in an embodiment. Figure 1 The left side portion (a) shows a touch display panel 100 without a fingerprint sensing function, and Figure 1Part (b) on the right side of shows a touch display panel 110 with a fingerprint sensing function. Part (a) shows a stacked structure based on a unit pixel. Both the touch display panel 100 and the touch display panel 110 have a glass substrate 110 and a glass substrate 160, a color filter layer 120, a liquid crystal layer 130, a common electrode layer (Com) 140 which may be formed by an indium tin oxide (ITO) layer and provides a display common voltage, and a thin film transistor (thin-film transistor; TFT) layer 150. The common electrode layer 140 may also serve as a touch sensing electrode layer 140, and a plurality of touch sensing electrodes are formed on the touch sensing electrode layer 140. The difference between the touch display panel 100 and the touch display panel 110 is that the touch display panel 110 has a fingerprint sensing circuit 170 formed by an ITO layer and a TFT layer 150, and the fingerprint sensing circuit 170 is used to optically sense a fingerprint touched on the identification glass substrate 110. In Figure 1 In part (b), the fingerprint sensing circuit 170 occupies a portion of the common electrode layer 140 and a portion of the TFT layer 150 in the touch display panel 110, so the signal strength of the touch sensing signal obtained by the touch sensing electrode layer 140 is reduced in total and affects the sensitivity of the touch sensing operation. In addition, the signal from the touch sensing electrode and the signal from the fingerprint sensing circuit 170 are prone to interfere with each other due to parasitic capacitance or other factors. In other embodiments, the touch sensing electrodes and the fingerprint sensing circuit 170 may not be arranged in the same layer, but may be arranged in adjacent upper and lower layers. Therefore, there is still a problem of reducing the sensitivity of the touch sensing operation due to signal interference. Therefore, in the embodiments of the present disclosure, it is considered how to maintain or improve the touch sensing sensitivity of the touch display panel with fingerprint sensing function.

[0072] In the embodiment of the present disclosure, because the electronic device performs the touch sensing operation and the fingerprint sensing operation at different times, and the fingerprint sensor array is implemented as a plurality of fingerprint sensing circuits, some conductive circuits in the fingerprint sensing circuit can be used as auxiliary touch sensing electrodes. Therefore, in the touch sensing operation of the present disclosure, in addition to performing the touch sensing operation (also referred to as the first touch sensing operation) on the original main touch sensing electrode (also referred to as the first touch sensing electrode), the conductive circuit of the fingerprint sensor array as the auxiliary touch sensing electrode (also referred to as the second touch sensing electrode) will also perform the second touch sensing operation, and the sensing results of the two touch sensing operations are combined with each other to serve as the basis for determining the touch position of the touch sensing operation. In other words, in addition to the first touch sensing electrode, some areas of the conductive circuit in the fingerprint sensor array 224 can also be used as the second touch sensing circuit, so in the embodiment of the present disclosure, the sensing result of the first touch sensing operation performed on the first touch electrode can be compensated by the sensing result of the second touch sensing operation performed on the second touch electrode, thereby improving the sensitivity of the touch sensing operation. According to the driving device 210 disclosed in the present disclosure, the display driving operation, the touch sensing operation (including the first and second touch sensing operations) and the fingerprint sensing operation are driven in different time segments. For example, the display driving operation and the touch sensing operation are operated in different time periods. The touch sensing operation and the fingerprint sensing operation are also operated in different time periods. The fingerprint sensing operation and the display driving operation can be operated simultaneously or in different time periods.

[0073] Figure 2 1 is a block diagram of an electronic device 200 having a touch display panel with a fingerprint sensing function in a first embodiment of the present disclosure. The electronic device 200 mainly includes a driving circuit 210 and a touch display panel 220. The driving circuit 210 is configured to drive the touch display panel 220. The driving circuit 210 mainly includes a plurality of touch sensing input terminals 211, a plurality of fingerprint sensing input terminals 212, a first touch sensing circuit 213, a second touch sensing circuit 214, and a fingerprint sensing circuit 215. The touch panel 220 includes a plurality of first touch sensing electrodes 222 and a fingerprint sensor array 224. The fingerprint sensor array 224 of the embodiment can be arranged in a specific area of ​​the touch display panel 220 as needed, or evenly arranged on all areas of the touch display panel 220.

[0074] The first touch sensing circuit 213 is coupled to a plurality of first touch sensing electrodes 222 in the touch display panel 220 through a plurality of touch sensing input terminals 211, and the first touch sensing circuit 213 is configured to perform the first touch sensing operation. The fingerprint sensing circuit 215 is coupled to the fingerprint sensor array 224 in the touch display panel through a plurality of fingerprint sensing input terminals 212, and is configured to perform a fingerprint sensing operation. The fingerprint sensing circuit 215 is connected to the fingerprint sensor array 224 in the touch display panel 220 to read out the analog fingerprint sensing signal and convert it into digital fingerprint sensing data for performing fingerprint recognition and user authentication. In an embodiment of the present disclosure, the touch sensing operation performed by the first touch sensing circuit 213 and the second touch sensing circuit 214 and the fingerprint sensing operation performed by the fingerprint sensing circuit 215 are performed without overlapping in time.

[0075] In an embodiment of the present disclosure, the fingerprint sensor array 224 includes a plurality of second touch sensing electrodes 225, which are formed by a portion of the conductive circuit of the fingerprint sensor array 224. The second touch sensing circuit 214 is coupled to the plurality of second touch sensing electrodes 225 in the fingerprint sensor array 224 of the touch display panel 220 through at least a portion of the plurality of fingerprint sensing input terminals 212. The second touch sensing circuit 214 is configured to perform a second touch sensing operation on the second touch sensing electrodes 225 in the fingerprint sensor array 224 to compensate for the touch sensing result of the first touch sensing operation performed by the first touch sensing circuit 213.

[0076] In detail, in an embodiment of the present disclosure, the conductive circuit of the fingerprint sensor array 224 in the touch display panel 220 may be used as an auxiliary touch sensing electrode (also referred to as the second touch sensing electrode 225) to perform a touch sensing operation, and the sensing result of the second touch sensing function performed by the second touch sensing circuit 214 may be used to compensate for the touch sensing result of the first touch sensing operation performed by the first touch sensing circuit 213, so as to improve or maintain the touch sensitivity of the electronic circuit 200. In other words, the sensing result of the first touch sensing operation performed by the first touch sensing circuit 213 and the sensing result of the second touch sensing operation performed by the second touch sensing circuit 214 may be combined together to determine the touch position of the finger touch on the touch display panel 220.

[0077] The driving circuit 210 further includes a switch circuit 216 and a data processing circuit 217. The switch circuit 216 is coupled to the fingerprint sensing circuit 215 and the second touch sensing circuit 214. The switch circuit 216 is configured to connect the second touch sensing circuit 214 and at least a portion of the plurality of fingerprint sensing terminals 212 in response to the first touch sensing circuit 213 performing a first touch sensing operation, and the switch circuit 216 is further configured to disconnect the second touch sensing circuit 214 and at least a portion of the plurality of fingerprint sensing terminals 212 in response to the fingerprint sensing circuit 215 performing a fingerprint sensing operation. In an embodiment of the present invention, the fingerprint sensor array 224 can be configured in a large area, similar to the active area of ​​the touch display panel 220, but only a small portion of the area in the touch display panel 220 has a low touch sensitivity. Therefore, the second touch sensing circuit 214 can receive the second touch sensing signal of the second touch sensing electrode 225 through a portion of the plurality of fingerprint sensing input terminals 212, and the second touch sensing electrode 225 is formed by only a portion of the conductive circuit corresponding to the low touch sensitivity area in the fingerprint sensor array 224.

[0078] The data processing circuit 217 is configured to generate the merged touch sensing data according to the first touch sensing data and the second touch sensing data. The first touch sensing data is derived from the first touch sensing signal received by the first touch sensing circuit 213, and the second touch sensing data is derived from the second touch sensing signal received by the second touch sensing circuit 214. The data processing circuit 217 is further configured to determine the touch position according to the plurality of touch sensing data including the merged touch sensing data.

[0079] The electronic device 200 further includes a host device 230. The host device 230 may be an application processor (AP) of the electronic device 200. The data processing circuit 217 provides the determined touch position to the host device 230. In some embodiments of the present disclosure, when a user touches the touch display panel 220 for fingerprint recognition, the host device 230 may receive the determined touch position from the data processing circuit 217, and then provide control information to the fingerprint sensing circuit 215, the control information relating to the range of the fingerprint sensing line for the fingerprint sensing circuit 215 to receive the sensing signal. The control information is generated based on the determined touch position.

[0080] The driving device 210 has a first touch sensing circuit 213 and a second touch sensing circuit 214, and the second touch sensing circuit 214 processes a second touch sensing signal from the fingerprint sensor array 224 as part of the second sensing electrode 225 in the touch display panel 220. The second touch sensing circuit 214 is connected to the corresponding input / output pad in the driving device 210 through the switch circuit 216 to connect to the second sensing electrode 225.

[0081] The touch display panel 220 may be implemented by a self-capacitive touch sensing mechanism or a mutual capacitance touch sensing mechanism. Taking the self-capacitive touch sensing mechanism as an example, the first touch sensing circuit 213 outputs a first touch drive signal to the first touch sensing electrode 222, and obtains a touch sensing signal from the first touch sensing electrode 222. Similarly, the second touch sensing circuit 214 outputs a second touch drive signal to the second touch sensing electrode 225, and obtains a second touch sensing signal from the second touch sensing electrode 225. Taking the mutual capacitance touch sensing mechanism as an example, the first touch sensing circuit 213 outputs a first touch drive signal to other electrodes on the touch display panel 220 that are not the first touch sensing electrode 222, and obtains a first touch sensing signal from the first touch sensing electrode 222. The second touch sensing circuit 214 outputs a second touch drive signal to other electrodes on the touch display panel 220 that are not the second touch sensing electrode 225, and obtains a second touch sensing signal from the second touch sensing electrode 225. The second touch drive signal and the first touch drive signal may be the same signal, that is, a signal having the same frequency, the same amplitude, and a DC offset signal, or a signal having the same frequency, the same phase but different amplitudes and / or DC offsets. The amplitudes or DC offsets of the two touch drive signals may be adjusted according to the actual conditions of different touch display panels.

[0082] In an embodiment of the present disclosure, the driving circuit 210 may be a single chip integrated circuit (i.e., a touch sensing and fingerprint sensing integrated circuit) for merging a touch and display driver integrated circuit (TDDI) and a fingerprint sensing circuit. In other embodiments of the present disclosure, the driving circuit 210 may refer to two integrated circuits (ICs) that are separately provided from the touch and display driver integrated circuit (TDDI) and the fingerprint sensing circuit. Figure 3 is a block diagram of an electronic device 300 having a touch display panel with a fingerprint sensing function in a second embodiment of the present disclosure. Figure 3 , Figure 2 and Figure 3 The difference between the two is that the driving device 310 includes two ICs for the touch and display driver integrated circuit 305 and the fingerprint sensing circuit 315. The touch and display driver integrated circuit 305 includes the first touch sensing circuit 213 and the second touch sensing circuit 214, the switch circuit 216 and the data processing circuit 217. Figure 2 and Figure 3 Each of the units or circuits in the touch display panel 220 has the same function. In an alternative to the second embodiment, the switching circuit 216 may be placed on a circuit on the touch display panel 220 .

[0083] Figure 4 2 is a schematic diagram of the touch display panel 220, the switch circuit 216 of the driving device 210, and some circuits in the second touch sensing circuit 214 in the first embodiment of the present disclosure. Figure 4 , mainly shows the fingerprint sensor array 224 and corresponding circuits in the touch display panel 220 for implementing the embodiment of the present disclosure. In the touch display panel 220 of the embodiment, it has a plurality of first touch sensing electrodes 400 (1, 1) to first touch sensing electrodes 400 (18, 32) with 18 rows and 32 columns. Therefore, the number of second touch sensing electrodes 225 can be up to 18. Taking the full HD display resolution as an example, it further has a plurality of fingerprint sensors (for example, fingerprint sensor 510-1 to fingerprint sensor 510-4) having a fingerprint sensor array 224 with 1080 columns in the touch display panel 220 of the embodiment, and the fingerprint sensor array 224 with 1080 columns is respectively coupled to 1080 fingerprint sensing lines (recorded as Sout1, Sout2, etc.). For example, fingerprint sensors 510-1-510-2 are connected to fingerprint sensing line Sout1, fingerprint sensors 510-3-510-4 are connected to fingerprint sensing line Sout2, and so on. For example, the conductive circuit of the fingerprint sensor in the area of ​​the first touch sensing electrode 400 (1, 32) forms the second touch sensing electrode 225. A total of 1080 fingerprint sensing lines are connected to 1080 fingerprint sensing input terminals of the driving circuit 210. The first touch sensing circuit 213 may have 32 analog front-end circuits (referred to as AFE channels, 32 channels) for performing touch sensing on the left side of the touch display panel 220. Figure 4 The second touch sensing circuit 214 may include 18 AFE circuits, labeled as 420-1 to 420-18. The second touch sensing circuit 214 may be responsible for processing the second touch sensing signals from a row of second touch sensing electrodes 225 at the same time.

[0084] like Figure 4As shown, the switch circuit 216 includes a plurality of switch groups, such as switch group G1 to switch group G18, wherein each switch group includes a plurality of switch elements, and the switch elements are used to short-circuit a group of fingerprint sensing input terminals, such as 60 fingerprint sensing input terminals, in response to the first touch sensing circuit 213 performing a first touch sensing operation. By short-circuiting the fingerprint sensing input terminals group by group, when the first touch sensing circuit 213 performs the first touch sensing operation, the second touch sensing circuit 225 simultaneously receives the second touch sensing signal on a row of second touch sensing electrodes 225. During the time period of the first touch sensing operation, the second touch sensing circuit 214 provides a second touch drive signal to the fingerprint sensor and receives the second touch sensing signal row by row. In the first touch sensing operation, a plurality of fingerprint sensing input terminals 212, which correspond to the fingerprint sensing lines of the fingerprint sensor connected to the first touch sensing electrodes, such as the fingerprint sensing lines in the area 400 (1, 32), form a node due to the short circuit, and therefore the AFE circuit 420-1 of the second touch sensing circuit 214 receives the second sensing signal from the node. Figure 4 In the example, the switching element ST is placed between each of the AFE circuits 420 - 1 to 420 - 18 and the corresponding short-circuit node, and the switching element ST is turned on in response to performing the first and second touch sensing operations.

[0085] In addition, the switch circuit 216 further includes a plurality of switch elements SF, for example, 1080 switch elements, wherein each switch element SF is capable of connecting a corresponding fingerprint sensing input terminal to an AFE channel of the fingerprint sensing circuit 215 when performing a fingerprint sensing operation. As described above, the host device 230 may receive the determined touch position from the data processing circuit 217, and provide control information to the fingerprint sensing circuit 215 accordingly, wherein the control information relates to the sensing signal received in the range of the fingerprint sensing line of the fingerprint sensing circuit 215. During the period of the fingerprint sensing operation, some of the plurality of switch elements SF are turned on according to the control information to connect a portion of the fingerprint sensing input terminal to the corresponding AFE channel of the fingerprint AFE circuit 430, wherein the portion of the fingerprint sensing input terminal is connected to the fingerprint sensing line in the range determined according to the touch position. During the period of the fingerprint sensing operation, the switch groups G1 to G18 are turned off.

[0086] For other details of the circuit structure of the fingerprint sensor (eg, fingerprint sensor 510-1 to fingerprint sensor 510-4), refer to Figure 5 . Figure 5 is a circuit diagram of a portion of the fingerprint sensor array 224 in the touch display panel 220 in the first embodiment of the present disclosure. Figure 5Taking the second fingerprint sensing electrode block corresponding to the 2×2 fingerprint sensor 510-1-510-1-510-4 area as an example, the actual second fingerprint sensing electrode in the touch display panel 220 may correspond to 50×50 fingerprint sensing pixels or more.

[0087] like Figure 5 As shown in FIG. 1 , each circuit structure of the fingerprint sensor 510-1 to the fingerprint sensor 510-4 has a plurality of transistors, such as a selection transistor, a reset transistor, and a bypass transistor. The conductive circuits of the fingerprint sensors 510-1 to 510-4 are on the same layer as the first touch sensing electrode 222. It is assumed that the fingerprint sensors 510-1 to 510-4 are within the sensing range determined by the touch position. During the period of the fingerprint sensing operation, the fingerprint sensing line Sout1 and the column line Sout2 are connected by Figure 2 and Figure 4 During the fingerprint sensing operation period, the fingerprint array gate (FPR GOA) circuit 410 provides a scanning signal to each row of the fingerprint sensor within the determined sensing range, for example Figure 5 The gate control signal SEL of the selection transistor.

[0088] During the time period of the touch sensing operation, Figure 2 The fingerprint sensing circuit 215 in the fingerprint sensor 510-4 sends a control signal to the FPRGOA circuit 410, and the FPRGOA circuit 410 generates a gate control signal to turn on / off the selection transistor in the fingerprint sensor 510-4 according to the control signal transmitted by the fingerprint sensing circuit 215. To implement the second touch sensing operation, the selection transistors in the region of the first touch sensing electrode 400 (1, 32) are turned on at the same time. Therefore, the second touch drive signal can be transmitted to the drain terminal of the selection transistor through the fingerprint sensing line Sout1 and the fingerprint sensing line Sout2, and the second touch drive signal is coupled from the drain terminal of the selection transistor to other wires in the fingerprint sensor, such as the gate terminal of the bypass transistor in each fingerprint sensor, due to the capacitive coupling effect. Figure 5 The gate terminal of the bypass transistor in each fingerprint sensor is coupled to the capacitor and the anode of the photosensitive element. Figure 2 The conductive circuit in the fingerprint sensor in the same layer as the first touch sensing electrode 222 in the fingerprint sensor is used as the second touch sensing electrode 225, and the second touch sensing signal generated by the second touch sensing electrode 225 can compensate Figure 2 The signal of the first touch sensing electrode 222 is lost.

[0089] Figure 6 In the first embodiment of the present disclosure Figure 4 4 is a circuit diagram of the AFE circuit 420-1 of the second touch sensing circuit 214 in FIG. Figure 4 The AFE circuit 420-1 of the second touch sensing circuit 214 in the embodiment includes an amplifier 610 and a feedback capacitor 620. The feedback capacitor 620 is coupled between the inverting terminal and the output terminal of the amplifier 610. At this time, the non-inverting terminal of the amplifier 610 is coupled to a reference voltage source Vref that provides a second touch drive signal. The inverting terminal of the amplifier 610 is coupled to the second touch sensing electrode, so as to receive the second touch sensing signal when performing the second touch sensing operation. The output terminal of the amplifier 610 is connected to other parts of the AFE circuit 420-1 (not shown).

[0090] FIG. 7A to FIG. 7C In the first embodiment of the present disclosure Figure 4 A block diagram of different structures of the driving device 210. Fig. 7A In the embodiment, the driving device 210 further includes a first analog-to-digital converter (ADC) ADC1 coupled between the data processing circuit 217 and the first touch sensing circuit 213 and a second analog-to-digital converter ADC2 coupled between the data processing circuit 217 and the second touch sensing circuit 214. The first touch sensing circuit 213 includes a plurality of AFE circuits AFE1, and each of the first AFE circuits (also referred to as AFE channels) AFE1 is configured to receive and process an analog first touch sensing signal from one of the first touch sensing electrodes through one of the plurality of touch sensing input terminals 211. In an embodiment, the first touch sensing circuit 213 and the second touch sensing circuit 214 have 18 channels. The second touch sensing circuit 214 may also include a plurality of second AFE circuits, and each of the second analog front end circuits AFE2 is configured to receive and process an analog second touch sensing signal from one of the second touch sensing electrodes through part of the plurality of fingerprint sensing input terminals 212.

[0091] exist Fig. 7AIn the embodiment, the data processing circuit 217 of the driving device 210 includes a digital back-end processing circuit DBE1 and a digital back-end processing circuit DBE2, an adder circuit 710, and a touch position determination circuit 705. The analog first touch sensing signal is sensed and received by the first touch sensing circuit 213, and the analog first touch sensing signal is converted by the first analog-to-digital converter ADC1 to generate digital first touch sensing data. The digital back-end processing circuit DBE1 receives and processes the digital first touch sensing signal to generate first touch sensing data. The analog second touch sensing signal is sensed and received by the second touch sensing circuit 214, and the analog second touch sensing signal is converted by the second analog-to-digital converter ADC2 to generate digital second touch sensing data. The digital back-end processing circuit DBE2 receives and processes the digital second touch sensing data to generate second touch sensing data. In other words, the first touch sensing data is derived from the first touch sensing signal received by the first touch sensing circuit 213, and the second touch sensing data is derived from the second touch sensing signal received by the second touch sensing circuit 214. The adder circuit 710 generates the merged touch sensing data according to the first touch sensing data and the second touch sensing data. The touch position determination circuit 705 determines a touch position based on a plurality of touch sensing data including the combined touch sensing data generated by the adder circuit 710 .

[0092] It should be noted that the first touch sensing signal is sensed and received by the first touch sensing circuit 213 at a sensing position of the touch display panel 220, and the second touch sensing signal is sensed and received by the second touch sensing circuit 214 at the same sensing position of the touch display panel 220. The driving device 210 also includes a storage unit coupled to the data processing circuit. The storage unit appropriately stores the first touch sensing data and the second touch sensing data, and the adder circuit 710 of the data processing circuit 217 accesses the storage unit to obtain the first touch sensing data and the second touch sensing data, thereby generating the combined touch sensing data.

[0093] exist Figure 7B In the embodiment, the data processing circuit 218 of the driving device 210 includes an adder circuit 720, a digital back-end processing circuit DBE, and a touch position determination circuit 705. The adder circuit 720 generates digital combined touch sensing data according to the first touch sensing data from the first analog-to-digital converter ADC1 and the second touch sensing data from the second analog-to-digital converter ADC2. The digital back-end processing circuit DBE receives and processes the digital combined touch sensing data to generate combined touch sensing data. The touch position determination circuit 705 determines the touch position according to a plurality of touch sensing data including the combined touch sensing data generated by the digital back-end processing circuit DBE.

[0094] exist Figure 7CIn the embodiment, the data processing circuit 219 of the driving device 210 includes an adder circuit 730 and a digital back-end processing circuit DBE1 and a digital back-end processing circuit DBE2. The analog first touch sensing signal is sensed and received by the first touch sensing circuit 213, and the analog first touch sensing signal is converted by the first analog-to-digital converter ADC1 to generate digital first touch sensing data. The digital back-end processing circuit DBE1 receives and processes the digital first touch sensing data to generate first touch sensing data. The analog second touch sensing signal is sensed and received by the second touch sensing circuit 214, and the analog second touch sensing signal is converted by the second analog-to-digital converter ADC2 to generate digital second touch sensing data. The digital back-end processing circuit DBE2 receives and processes the digital second touch sensing data to generate second touch sensing data. The adder circuit 730 generates the combined touch sensing data in the form of raw data according to the first touch sensing data and the second touch sensing data. In detail, the first touch sensing data and the second touch sensing data are also in the form of raw data, so the adder circuit 730 generates the combined touch sensing data for directly adding the first touch sensing data and the second touch sensing data in the form of raw data. The data processing circuit 219 transmits the merged touch sensing data to the host device 230. The host device 230 further includes a touch position determination circuit 705 for determining a touch position based on a plurality of touch sensing data including the merged touch sensing data in the form of raw data.

[0095] In the implementation of the embodiment of the present invention, the scanning direction of the first touch sensing circuit 213 operating on the first touch sensing electrodes is different from the scanning direction of the second touch sensing circuit 315 operating on the second touch sensing electrodes. Figure 8 is a schematic diagram showing a scanning direction of a first touch sensing operation and a scanning direction of a second touch sensing operation in a touch display panel in an implementation scheme of the disclosed embodiment. In detail, Figure 8 Part (a) presents Figure 2 The first touch sensing circuit 213 in the touch display panel 220_1 receives the first touch sensing signal at the position of the two rows of the first touch sensing electrodes at the same time, and the scanning direction 810a1 and the scanning direction 810a2 present the next position of the two rows of the first touch sensing circuit 213 at the next time period of the first touch sensing operation. The first touch sensing operation is performed by scanning the touch sensing electrodes from the left side toward the center in the horizontal direction (scanning direction 810a1) and from the right side toward the center in the horizontal direction (scanning direction 810a2). Figure 8Part (b) shows that the second touch sensing circuit 214 receives the second touch sensing signal at the position of one row on the touch display panel 220_1 at the same time, and the scanning direction 810b of the fingerprint sensing circuit 215 shows the next position of one row at the next time period of the touch sensing operation. Since the first touch sensing operation and the second touch sensing operation have different scanning directions, some second touch sensing data need to be saved in the storage unit.

[0096] FIG. 9A to FIG. 9C It is used to further describe the embodiments of the present disclosure. Figure 8 Schematic diagram of touch sensing operations performed by a first touch sensing circuit and a second touch sensing circuit. In performing the first and second touch sensing operations, the touch sensing enable signal TSHD sequentially has periodic pulses in a time period represented by T0-T8. Figures 9A-9C Indicates the situation that the first touch sensing circuit 213 receives the first touch sensing data and the second touch sensing circuit 214 receives the second touch sensing data in the time periods T0, T1 and T8. In the disclosed embodiment, the touch display panel 220_1 has 18 first touch sensing electrodes of columns X1 to X18 and 32 rows Y1 to Y32, and the first touch sensing data is recorded as RX(1,1) to RX(18,32) and the second touch sensing data is recorded as RX'(1,1) to RX'(18,9) in rows Y1 to Y9. In other words, the second touch sensing electrodes are arranged only in rows Y1 to Y9, and there are no second touch sensing electrodes in rows Y10 to Y18. The first touch sensing data RX(1,1) and the second touch sensing data RX'(1,1) are sensed at the same sensing position of the touch display panel.

[0097] exist Fig.9A In the time period T0, Fig.9A In part (a) of the embodiment, the first touch sensing data of each first touch sensing electrode at the column X1 and the column X18 are simultaneously received, and in Fig.9A The second touch sensing data of each second touch sensing electrode at row Y1 is simultaneously received in part (b). Therefore, the merged touch sensing data corresponding to the position of the first touch sensing electrode (X1, Y1) can be generated based on the first touch sensing data RX(1, 1) and the second touch sensing data RX'(1, 1), and the merged touch sensing corresponding to the position of the first touch sensing electrode (X18, Y1) can be generated based on the first touch sensing data RX(18, 1) and the second touch sensing data RX'(18, Y1), but the other touch sensing signal data in the T0 time period (i.e., RX(1, 2) to RX(1, 9), RX'(2, 1) to RX'(17, 1)) need to be appropriately stored by the storage unit.

[0098] exist Fig. 9B In the time period T1, Fig. 9B In part (a) of the embodiment, the first touch sensing data of each first touch sensing electrode at column X2 and column X17 are simultaneously received, and in Fig. 9B The second touch sensing data of each second touch sensing electrode at row Y2 is simultaneously received in part (b). Therefore, the merged touch sensing data corresponding to the position of the first touch sensing electrode (X2, Y1) can be generated based on the first touch sensing data RX(2, 1) and the previously stored second touch sensing data RX'(2, 1), and the merged touch sensing data corresponding to the position of the first touch sensing electrode (X17, Y1) can be generated based on the first touch sensing data RX(17, 1) and the previously stored second touch sensing data RX'(17, 1). The merged touch sensing data corresponding to the position of the first touch sensing electrode (X2, Y2) can be generated based on the first touch sensing data RX(2, 2) and the second touch sensing data RX'(2, 2), and the merged touch sensing data corresponding to the position of the first touch sensing electrode (X17, Y2) can be generated based on the first touch sensing data RX(17, 2) and the previously stored second touch sensing data RX'(17, 2). However, in the time period T1, other touch sensing data need to be appropriately stored by the storage unit.

[0099] exist Fig. 9C In the time period T8, at the sensing enable signal T8, Fig. 9C In part (a) of the embodiment, the first touch sensing data of each first touch sensing electrode at column X9 and column X10 are simultaneously received, and in Fig. 9C In part (b), the second touch sensing data of each second touch sensing electrode at row Y9 is simultaneously received. For how the combined touch sensing data is generated, please refer to FIG. 9A to FIG. 9B Description.

[0100] Fig.10 Schematic diagram showing the area of ​​the fingerprint sensor array arranged in the touch display panel 220_2 and the touch display panel 220_2' as examples in the embodiment of the present disclosure. In part (a) of the touch display panel 220_2, the second touch sensing electrodes are arranged only in rows Y1 to Y9, and there are no second touch sensing electrodes in rows Y10 to Y18. In part (b) of the touch display panel 220_2, the second touch sensing electrodes are arranged on all areas of the touch display panel 220_2', which has an interval arrangement of the rows in the touch display panel 220_2'. Those skilled in the art can adjust the sensing position of the second touch sensing electrode in the touch display panel according to their needs.

[0101] Fig.11FIG. 1 is a flow chart of a method for driving a touch panel with a fingerprint sensing function in an embodiment of the present disclosure. Figure 2 The driving circuit 210 or Figure 3 The driving circuit 310 is implemented in Fig.11 . The driving method mainly includes steps S1110 to S1130. In step S1110, the driving circuit performs a first touch sensing operation by touching a plurality of first touch sensing electrodes in the display panel. In step S1120, the driving circuit performs a fingerprint sensing operation by touching a fingerprint sensor array in the display panel, wherein the first touch sensing operation and the fingerprint sensing operation are performed without overlapping in time. In step S1130, the driving circuit performs a second touch sensing operation by touching a plurality of second touch sensing electrodes in the fingerprint sensor array of the display panel, wherein the second touch sensing operation performed by the plurality of second touch sensing electrodes in the fingerprint sensor array is used to compensate for the touch sensing result of the first touch sensing operation.

[0102] The driving method further includes step S1140. In step S1140, the driving circuit generates merged touch sensing data according to the first touch sensing data and the second touch sensing data, wherein the first touch sensing data is derived from the first touch sensing signal received by the first touch sensing circuit, and the second touch sensing data is derived from the second touch sensing signal received by the second touch sensing circuit. In addition, the driving circuit determines the touch position according to the multiple touch sensing data including the merged touch sensing data. For details of the implementation scheme of the driving method, please refer to the above embodiments of the present disclosure.

[0103] 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 foregoing, it is intended that the present disclosure encompasses modifications and variations provided that the modifications and variations fall within the scope of the appended claims and their equivalents.

Claims

1. A driving device for driving a touch display panel with a fingerprint sensing function, comprising: a plurality of touch sensing input terminals; multiple fingerprint sensing inputs; a first touch sensing circuit, coupled to a plurality of first touch sensing electrodes in the touch display panel through the plurality of touch sensing input terminals, and configured to perform a first touch sensing operation on the plurality of first touch sensing electrodes; a fingerprint sensing circuit coupled to a fingerprint sensor array in the touch display panel through the plurality of fingerprint sensing input terminals and configured to perform a fingerprint sensing operation, wherein the first touch sensing operation and the fingerprint sensing operation are performed without overlapping in time; a second touch sensing circuit coupled to a plurality of second touch sensing electrodes formed by a portion of the conductive circuit of the fingerprint sensor array through at least a portion of the plurality of fingerprint sensing input terminals and configured to perform a second touch sensing operation on the plurality of second touch sensing electrodes; as well as a switch circuit coupled to the fingerprint sensing circuit and the second touch sensing circuit, configured to connect the second touch sensing circuit and at least a portion of the plurality of fingerprint sensing input terminals in response to the first touch sensing circuit performing the first touch sensing operation, and configured to disconnect the second touch sensing circuit and at least a portion of the plurality of fingerprint sensing input terminals in response to the fingerprint sensing circuit performing the fingerprint sensing operation, wherein the touch sensing result of the second touch sensing operation is used to compensate the touch sensing result of the first touch sensing operation performed on the plurality of first touch sensing electrodes, The first touch sensing operation performed by the first touch sensing circuit and the second touch sensing operation performed by the second touch sensing circuit are performed in the same period.

2. The driving device according to claim 1, wherein the switch circuit comprises a plurality of switch groups, and each of the plurality of switch groups comprises a plurality of switch elements, and the switch elements are configured to short-circuit a first number of fingerprint sensing input terminals in response to the first touch sensing circuit performing the first touch sensing operation.

3. The driving device according to claim 1, wherein the switch circuit comprises a plurality of switch elements, and In response to the fingerprint sensing circuit performing a fingerprint sensing operation, a preconfigured number of the plurality of switch elements are selected to be turned on to transmit a fingerprint sensing signal to the fingerprint sensing circuit through the at least a portion of the plurality of fingerprint sensing input terminals.

4. The driving device according to claim 1, further comprising: a data processing circuit configured to generate merged touch sensing data based on first touch sensing data and second touch sensing data, wherein the first touch sensing data is derived from a first touch sensing signal received by the first touch sensing circuit, and the second touch sensing data is derived from a second touch sensing signal received by the second touch sensing circuit, and The data processing circuit is further configured to determine a touch position based on a plurality of touch sensing data including the combined touch sensing data.

5. The driving device according to claim 4, further comprising: a storage unit, coupled to the data processing circuit, The storage unit stores the first touch sensing data and the second touch sensing data, and the data processing circuit accesses the storage unit to obtain the first touch sensing data and the second touch sensing data, thereby generating the combined touch sensing data.

6. The driving device according to claim 1 , wherein the first touch sensing circuit comprises a plurality of first analog front-end circuits, and each of the first analog front-end circuits is configured to receive and process an analog touch sensing signal from one of the touch sensing electrodes, and The second touch sensing circuit includes a plurality of second analog front-end circuits, and each of the second analog front-end circuits is configured to receive and process an analog touch sensing signal from one of the second touch sensing electrodes.

7. The driving device according to claim 6, wherein first touch sensing data is received by the first touch sensing circuit at a sensing position relative to the touch display panel, and second touch sensing data is received by the second touch sensing circuit at the same sensing position relative to the touch display panel.

8. The driving device according to claim 5, further comprising: a first analog-to-digital converter, coupled between the data processing circuit and the first touch sensing circuit; as well as The second analog-to-digital converter is coupled between the data processing circuit and the second touch sensing circuit. 9 . The driving device according to claim 1 , wherein the plurality of second touch sensing electrodes are formed by a portion of a circuit of the fingerprint sensor array and are connected to the at least a portion of the plurality of fingerprint sensing input terminals.

10. A driving method for a touch display panel with a fingerprint sensing function, wherein the touch display panel comprises a plurality of first touch sensing electrodes and a fingerprint sensor array, the driving method comprising: performing a first touch sensing operation on the plurality of first touch sensing electrodes in the touch display panel; performing a fingerprint sensing operation on the fingerprint sensor array in the touch display panel, wherein the first touch sensing operation and the fingerprint sensing operation are performed without overlapping in time; as well as performing a second touch sensing operation on a plurality of second touch sensing electrodes in the fingerprint sensor array of the touch display panel, wherein a touch sensing result of the second touch sensing operation is used to compensate for a touch sensing result of the first touch sensing operation performed on the plurality of first touch sensing electrodes, The driving method is implemented by a driving device. The driving device comprises a plurality of touch sensing input terminals, a plurality of fingerprint sensing input terminals, a first touch sensing circuit, a second touch sensing circuit and a switch circuit, wherein the switch circuit is coupled to the fingerprint sensing circuit and the second touch sensing circuit. wherein the first touch sensing operation performed by the first touch sensing circuit and the second touch sensing operation performed by the second touch sensing circuit are performed in the same period, The driving method further comprises: In response to the first touch sensing circuit performing the first touch sensing operation, controlling the switch circuit to connect the second touch sensing circuit and at least a portion of the plurality of fingerprint sensing input terminals; as well as In response to the fingerprint sensing circuit performing the fingerprint sensing operation, the switch circuit is controlled to disconnect the second touch sensing circuit and the at least a portion of the plurality of fingerprint sensing input terminals.

11. The driving method according to claim 10, wherein the first touch sensing circuit is coupled to the plurality of first touch sensing electrodes in the touch display panel through the plurality of touch sensing input terminals, The second touch sensing circuit is coupled to the multiple second touch sensing electrodes through at least a portion of the multiple fingerprint sensing input terminals, the second touch sensing electrodes are part of the circuit in the fingerprint sensor array of the touch display panel, and the second touch sensing circuit performs the second touch sensing operation according to the multiple second touch sensing electrodes in the fingerprint sensor array.

12. The driving method according to claim 10, wherein the switch circuit comprises a plurality of switch groups, and each of the plurality of switch groups comprises a plurality of switch elements, and the switch elements are configured to short-circuit a first number of fingerprint sensing input terminals in response to the first touch sensing circuit performing the first touch sensing operation.

13. The driving method according to claim 10, wherein the switch circuit comprises a plurality of switch elements, and In response to performing the fingerprint sensing operation, a preconfigured number of the plurality of switch elements are selected to be turned on to transmit a fingerprint sensing signal to the fingerprint sensing circuit through the at least a portion of the plurality of fingerprint sensing input terminals.

14. The driving method according to claim 11, further comprising: generating combined touch sensing data according to first touch sensing data and second touch sensing data, wherein the first touch sensing data is derived from a first touch sensing signal received by a first touch sensing circuit, and the second touch sensing data is derived from a second touch sensing signal received by a second touch sensing circuit; as well as A touch position is determined according to a plurality of touch sensing data including the combined touch sensing data.

15. The driving method according to claim 14, wherein first touch sensing data is sensed and received by the first touch sensing circuit at a sensing position of the touch display panel, and the second touch sensing data is sensed and received by the second touch sensing circuit at the same sensing position of the touch display panel.

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