Electronic circuits and methods for generating fingerprint images

Abstract

This invention provides an electronic circuit and a method for generating a fingerprint image. The electronic circuit is adapted to drive a display panel comprising a plurality of fingerprint sensing lines. The electronic circuit includes a fingerprint sensing circuit. The fingerprint sensing circuit is configured to receive fingerprint sensing signals corresponding to a fingerprint image from the fingerprint sensing lines. The fingerprint sensing signals comprise a plurality of fingerprint image segments. The fingerprint sensing circuit rearranges the fingerprint image segments according to the order of the fingerprint sensing lines to generate a fingerprint image.

Description

Technical Field

[0001] The present invention relates to an electronic circuit and a method for generating an image, and more specifically, to an electronic circuit suitable for driving a display panel including a touch sensor and a fingerprint sensor and a method for generating a fingerprint image. Background Technology

[0002] In recent years, the demand for fingerprint sensing has been gradually increasing. To reduce the size of electronic devices, the fingerprint sensing area can overlap with the display area. For example, under-display fingerprint identification technology embeds a fingerprint sensor in the display panel, allowing the sensor to sense or acquire a fingerprint image through the display panel. When a touch event, such as fingerprint recognition, occurs, the touch sensing circuit reports it to the application processor of the electronic device via a designated interface. The application processor then further controls the display driving circuit to drive the display panel to display the image used for fingerprint sensing. On the other hand, the application processor further controls the fingerprint sensing circuit to perform the fingerprint sensing operation. After the fingerprint sensing operation, the fingerprint sensing circuit transmits the sensing information to the application processor for fingerprint recognition, and then the application processor completes the fingerprint recognition based on the sensing information.

[0003] However, for electronic circuits capable of driving display panels for display, touch sensing, and fingerprint sensing operations, multiple input and output (I / O) pins and complex wiring may be required between the electronic circuits and the display panel for signal transmission. Multiple I / O pins and complex wiring will increase the width of the fan-out area corresponding to the electronic circuits and the size of the frame boundary in the display panel near the electronic circuits.

[0004] On the other hand, the electronic circuitry may include some I / O pins that are not connected to the display panel. In this case, the raw fingerprint image data may contain fingerprint information that needs to be removed or rearranged. Summary of the Invention

[0005] This invention relates to an electronic circuit and a method for generating a fingerprint image, wherein the width of the fan-out region corresponding to the electronic circuit and the size of the frame boundary in the display panel near the electronic circuit are relatively small. Additionally, a data remapping operation is also performed to generate the fingerprint image.

[0006] Embodiments of the present invention provide an electronic circuit adapted to drive a display panel comprising a plurality of fingerprint sensing lines. The electronic circuit includes a fingerprint sensing circuit. The fingerprint sensing circuit is configured to receive fingerprint sensing signals corresponding to fingerprint images from the fingerprint sensing lines. The fingerprint sensing signals comprise a plurality of fingerprint image segments. The fingerprint sensing circuit rearranges the fingerprint image segments according to the order of the fingerprint sensing lines to generate a fingerprint image.

[0007] In embodiments of the present invention, the electronic circuit further includes a plurality of first pins. The display panel further includes a plurality of second pins connected to a first portion of the first pins via transmission lines. The second portion of the first pins is in a floating state.

[0008] In embodiments of the present invention, the fingerprint image fragment contains interlaced image stripes. When the fingerprint sensing circuit rearranges the fingerprint image fragment, the fingerprint sensing circuit further removes the interlaced image stripes from the fingerprint image fragment.

[0009] In embodiments of the present invention, the interlaced image stripes do not include fingerprint information.

[0010] In an embodiment of the invention, the second portion of the first pin is distributed in an interlaced manner between the first portions of the first pin.

[0011] In an embodiment of the present invention, the second portion of the first pin is collectively distributed among the first portions of the first pin.

[0012] In embodiments of the present invention, the fingerprint image fragment does not include interlaced image stripes.

[0013] Embodiments of the present invention provide a method for generating a fingerprint image. The method includes: receiving a fingerprint sensing signal corresponding to a fingerprint image from fingerprint sensing lines of a display panel, wherein the fingerprint sensing signal includes a plurality of fingerprint image segments; and rearranging the fingerprint image segments according to the order of the fingerprint sensing lines to generate a fingerprint image.

[0014] In embodiments of the invention, the fingerprint image fragment contains interlaced image stripes. The method further includes removing the interlaced image stripes from the fingerprint image fragment when the fingerprint image fragment is rearranged.

[0015] In embodiments of the present invention, the interlaced image stripes do not contain fingerprint information.

[0016] To make the foregoing more understandable, several embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings are included to provide a further understanding of this disclosure, and are incorporated in and form a part of this specification. The drawings illustrate exemplary embodiments of this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0018] Figure 1 This is a schematic block diagram illustrating an electronic device according to an embodiment of the present invention.

[0019] Figure 2 It is shown Figure 1 A schematic diagram of the display panel shown.

[0020] Figure 3 It is shown Figure 1 The diagram shows a schematic block diagram of the electronic circuit.

[0021] Figure 4 This is a schematic diagram illustrating the wiring structure between the electronic circuit and the display panel according to an embodiment of the present invention.

[0022] Figure 5 and Figure 6 This illustrates an embodiment of the invention. Figure 4 A schematic diagram of an electronic device and its data remapping operation.

[0023] Figure 7 This is a schematic diagram illustrating the wiring structure between an electronic circuit and a display panel according to another embodiment of the present invention.

[0024] Figure 8 and Figure 9 This illustrates an embodiment of the invention. Figure 7 A schematic diagram of an electronic device and its data remapping operation.

[0025] Figure 10 This is a flowchart illustrating the steps in a method for generating a fingerprint image according to an embodiment of the present invention.

[0026] Explanation of icon numbers

[0027] 100: Electronic devices;

[0028] 101: I / O pin;

[0029] 102: Drive and sensing channels;

[0030] 110: Electronic circuits;

[0031] 112: Display driver circuit;

[0032] 114: Touch sensing circuit;

[0033] 116: Fingerprint sensing circuit;

[0034] 119: Circuit with grouped wires;

[0035] 120: Display panel;

[0036] 121: Timing controller;

[0037] 122: Display pixels;

[0038] 122_1, 122_2, 122_3, 122_4: pixels;

[0039] 123: Other controllers or processors;

[0040] 124: Touch sensor;

[0041] 125: First switching unit;

[0042] 126: Fingerprint sensor;

[0043] 130: Control circuit;

[0044] 140: Transmission line;

[0045] 141: Touch controller;

[0046] 161: Digital circuits;

[0047] 163: Analog front-end circuit;

[0048] 501: First switching element;

[0049] 502: Second switching element;

[0050] 600: Interlaced image stripes;

[0051] B: Blue sub-pixel;

[0052] CH1, CH70, CH71, CH80, CH81, CH170, CH171, CH270: Fingerprint sensing channels;

[0053] DAC: Signal Converter;

[0054] FPI_1, FPI_2: Fingerprint images;

[0055] FPI_11, FPI_12, FPI_21, FPI_22, FPI_23: fingerprint image fragments;

[0056] FSL, RX1, RX171, RX270, RX271, RX341, RX360, RX540, RX541, RX610, RX721, RX800, RX1080: Fingerprint sensor cable;

[0057] G: Green subpixel;

[0058] GDL: Display scan lines;

[0059] GSL: Fingerprint scanning line;

[0060] MUX2: Switching unit;

[0061] N1D, N1F: First terminals;

[0062] N2: Second terminal / I / O pin / First pin;

[0063] N3D, N3F: Third terminals;

[0064] N4: Fourth terminal / I / O pin;

[0065] R: Red subpixel;

[0066] S100, S110: Steps;

[0067] S2: Display drive signal;

[0068] S3: Fingerprint sensing signal;

[0069] SDL: Display data cable;

[0070] SOP: Output buffer;

[0071] SW1, SW2: Switching circuit;

[0072] SW1SD, SW1FP: Control signals;

[0073] TSL: Touch Sensing Line;

[0074] W: White subpixel. Detailed Implementation

[0075] The following embodiments are provided to describe the present disclosure in detail, but the present disclosure is not limited to the provided embodiments, and the provided embodiments can be suitably combined. The terms "coupling" or "connecting" as used in the specification (including the claims) of this application may refer to any direct or indirect connection. For example, "the first device is coupled to the second device" should be interpreted as "the first device is directly connected to the second device" or "the first device is indirectly connected to the second device through other devices or connecting members." The term "signal" may refer to current, voltage, charge, temperature, data, electromagnetic waves, or any one or more signals. Additionally, the term "and / or" may refer to "at least one of them." For example, "the first signal and / or the second signal" should be interpreted as "at least one of the first signal and the second signal."

[0076] Figure 1 This is a schematic block diagram illustrating an electronic device according to an embodiment of the present invention. (Reference) Figure 1 The electronic device 100 of this embodiment includes electronic circuitry 110 and a display panel 120. The display panel 120 includes a touch sensor and a fingerprint sensor. The electronic circuitry 110 is configured to be coupled to the display panel 120. The electronic circuitry 110 is adapted to drive the display panel 120.

[0077] In this embodiment, the electronic device 100 may be an electronic device with display function, touch sensing function, and fingerprint sensing function. In one embodiment, the electronic device 100 may be, but is not limited to, a smartphone, a non-smartphone, a wearable electronic device, a tablet computer, a personal digital assistant, a laptop computer, and other portable electronic devices that can operate independently and have display function, touch sensing function, and fingerprint sensing function. In one embodiment, the electronic device 100 may be, but is not limited to, a portable or non-portable electronic device in a vehicle intelligent system. In one embodiment, the electronic device 100 may be, but is not limited to, a smart home appliance, such as a television, computer, refrigerator, washing machine, telephone, induction cooker, table lamp, etc.

[0078] Figure 2 It is shown Figure 1 A schematic diagram of the display panel shown. (Reference) Figure 2The display panel 120 in this embodiment includes a plurality of display pixels 122, a plurality of touch sensors 124, and a plurality of fingerprint sensors 126. Electronic circuitry 110 drives and controls the display panel 120 to perform display operations, touch sensing operations, and fingerprint sensing operations. Specifically, electronic circuitry 110 drives and controls the display pixels 122 to display images via display scan lines (GDL) and display data lines (SDL). Electronic circuitry 110 also drives and controls the touch sensors 124 to sense touch events on the display panel 120 via touch scan lines and touch sensing lines (TSL). In one embodiment, the touch sensor 124 may be a touch sensing electrode during the touch sensing phase, and the touch sensor 124 may be a common electrode during the display phase. In this embodiment, as... Figure 2 As shown, the touch sensor 124 of the display panel 120 can be an in-cell touch sensor. For in-cell touch sensors, the display panel 120 inherently does not have touch scan lines, and touch drive signals can be directly transmitted to the touch sensor 124 via the touch sensing line TSL. For other types of touch sensors, the display panel 120 may have touch scan lines for transmitting touch drive signals. Figure 2 In this embodiment, the touch sensing line TSL is also configured to transmit touch drive signals from the electronic circuitry 110. The electronic circuitry 110 also drives and controls the fingerprint sensor 126 to sense fingerprint images on the display panel 120 via the fingerprint scanning line GSL and the fingerprint sensing line FSL.

[0079] In one embodiment, the display panel 120 may be an in-unit fingerprint sensor and touch sensor embedded in the display panel, but the invention is not limited thereto. In one embodiment, the electronic circuit 110 may drive and control the electronic device 100 to perform in-display fingerprint recognition, i.e., fingerprint identification. In one embodiment, the fingerprint sensor 126 may be an optical fingerprint sensor.

[0080] Figure 3 It is shown Figure 1 A schematic block diagram of the electronic circuit. (Reference) Figure 2 and Figure 3The electronic circuit 110 may include a display driving circuit 112, a fingerprint sensing circuit 116, and a touch sensing circuit 114. The display driving circuit 112 is configured to drive and control display pixels 122 to display images via display scan lines GDL and display data lines SDL. The display driving circuit 112 generates display driving signals for driving the display data lines SDL of the display panel 120. The display driving circuit 112 may include a timing controller 121, a display driver, and other functional circuitry for display operation. The display driving circuit 112 may also include a controller or processor 123 for other control functions of the display operation. The touch sensing circuit 114 is configured to drive and control a touch sensor 124 to sense touch events on the display panel 120 via a touch sensing line TSL. The touch sensing circuit 114 may include a touch controller 141, an analog front end (AFE) circuit, an analog-to-digital converter (ADC) circuit, and other functional circuitry for touch sensing operation. The fingerprint sensing circuit 116 is configured to drive and control the fingerprint sensor 126 to sense a fingerprint on the display panel 120 via the fingerprint scan line GSL and the fingerprint sensing line FSL. The fingerprint sensing circuit 116 receives a fingerprint sensing signal corresponding to a fingerprint image from the fingerprint sensor 126, and can also process the fingerprint sensing signal to obtain a fingerprint image. The fingerprint sensing circuit 116 may include digital circuitry 161, an AFE circuit, an ADC circuit, and other functional circuitry for fingerprint sensing operations.

[0081] In one embodiment, the electronic circuit 110 is implemented as a single semiconductor chip. When the electronic circuit 110 is implemented as a single-chip integrated circuit that drives and controls the display panel 120 to perform display operations, touch sensing operations, and fingerprint sensing operations, the electronic circuit 110 may include a control circuit 130, which is, for example, a micro-controller-based core circuit to perform all control functions for the display operations, touch sensing operations, and fingerprint sensing operations. The control circuit 130 may include at least one of a timing controller 121, a touch controller 141, a digital circuit 161, and other controllers or processors 123 of the display driver circuit 112.

[0082] The display driver circuit 112, the touch sensing circuit 114, and the fingerprint sensing circuit 116 communicate with each other via a signal transmission interface, such as a Mobile Industry Processor Interface (MIPI), an Inter-Integrated Circuit (I2C) interface, a Serial Peripheral Interface (SPI), and / or other similar or suitable interfaces.

[0083] about Figure 3 The hardware structure of the components in the embodiments, including the timing controller 121, touch controller 141, and digital circuit 161, can be a processor with computing capabilities. Alternatively, the timing controller 121, touch controller 141, and digital circuit 161 can be designed using a hardware description language (HDL) or any other design method for digital circuits familiar to those skilled in the art, and can be hardware circuits implemented using a field-programmable gate array (FPGA), a complex programmable logic device (CPLD), or an application-specific integrated circuit (ASIC). Furthermore, sufficient teaching, suggestions, and implementation details for the hardware structure of the display driver circuit 112, touch sensing circuit 114, and fingerprint sensing circuit 116 can be obtained with reference to common knowledge in the related art, which will not be repeated below.

[0084] Figure 4 This is a schematic diagram illustrating the wiring structure between the electronic circuitry and the display panel according to an embodiment of the present invention. (Reference) Figures 3 to 4 Electronic circuit 110 includes a switching circuit SW1. Display panel 120 includes a switching circuit SW2. Control circuit 130 is configured to generate control signals to control the operation of switching circuits SW1 and SW2. Switching circuit SW1 may be configured to be coupled to switching circuit SW2 via transmission line 140. In this embodiment, switching circuit SW1 is disposed in electronic circuit 110, and display panel 120 does not include switching circuit SW1. Therefore, the size of the frame boundary near the electronic circuit in display panel 120 near electronic circuit 110 can be reduced.

[0085] In electronic circuit 110, switching circuit SW1 includes multiple first terminals N1D and N1F, and multiple second terminals N2 (first pins). The number of first terminals N1D and N1F is greater than the number of second terminals N2. First terminal N1D is coupled to display driving circuit 112. In this embodiment, display driving circuit 112 includes output buffer SOP and signal converter DAC, and outputs display driving signal S2 for driving display panel 120. First terminal N1F is coupled to AFE circuit 163 of fingerprint sensing circuit 116 via wire grouping circuit 119. Second terminal N2 can be configured to be coupled to switching circuit SW2 of display panel 120 via transmission line 140. Second terminal N2 can be an I / O pin of electronic circuit 110.

[0086] In this embodiment, the switching circuit SW1 includes a plurality of first switching elements 501 and a plurality of second switching elements 502. The first switching elements 501 are coupled between the first circuit 112 and the second terminal N2. During the display driving phase, the first switching elements 501 are controlled to transmit the display driving signal S2 to the display panel 120 via the control signal SW1SD. The control signal SW1SD is asserted during the display driving phase. The second switching elements 502 are coupled between the wire grouping circuit 119 and the second terminal N2. The second switching elements 502 are controlled to receive a fingerprint sensing signal S3 from the display panel 120 and, during the fingerprint sensing phase, transmit the fingerprint sensing signal S3 to the AFE circuit 163 via the control signal SW1FP. The control signal SW1FP is asserted during the fingerprint sensing phase. In one embodiment, the second switching elements 502 can be controlled to transmit the fingerprint sensing signal S3 to the AFE circuit 163 in response to the determination of touch information during the fingerprint sensing phase.

[0087] In this embodiment, the electronic circuit 110 outputs a display driving signal S2 to the display panel 120 and receives a fingerprint sensing signal S3 from the display panel 120 via the same I / O pin N2. The display driving signal S2 and the fingerprint sensing signal S3 are transmitted on the transmission line 140 at different stages, and the transmission line 140 is shared by both the display driving signal S2 and the fingerprint sensing signal S3. The number of I / O pins is small, and the wiring between the electronic circuit 110 and the display panel 120 is relatively simple.

[0088] In this embodiment, electronic circuit 110 further includes wire grouping circuit 119. Wire grouping circuit 119 is coupled between switching circuit SW1 and AFE circuit 163. Wire grouping circuit 119 is configured to connect a plurality of fingerprint sensing lines FSL to each of the sensing channels in AFE circuit 163 in a wire-OR manner. Second switching element 502 is grouped into multiple groups and connected to AFE circuit 163 via wire grouping circuit 119. By grouping the second switching element 502, wire grouping circuit 119 groups the fingerprint sensing lines FSL into multiple groups, and these groups are correspondingly connected to the fingerprint sensing channels in AFE circuit 163. Each group of fingerprint sensing lines FSL corresponds to one fingerprint sensing channel. For example, AFE circuit 163 may be designed to have 270 fingerprint sensing channels and 1080 fingerprint sensing lines FSL. The 1080 fingerprint sensing lines are divided into 270 groups.

[0089] In the display panel 120, the switching circuit SW2 includes multiple third terminals N3D and N3F, and multiple fourth terminals N4 (second pins). The number of third terminals N3D and N3F is greater than the number of fourth terminals N4. Third terminals N3D are coupled to the display data line SDL. Third terminals N3F are coupled to the fingerprint sensing line FSL. Fourth terminals N4 can be configured to be coupled to the switching circuit SW1 of the electronic circuit 110 via transmission line 140. Fourth terminals N4 can be I / O pins of the display panel 120.

[0090] The switching circuit SW2 includes multiple switching units MUX2. The switching units MUX2 are switched to receive a display drive signal S2 from the electronic circuit 110 during the display drive phase, and to transmit a fingerprint sensing signal S3 to the electronic circuit 110 during the fingerprint sensing phase. For example, the switching unit MUX2 may be a 1:5 multiplexer.

[0091] In this embodiment, pixels 122_1, 122_2, 122_3, and 122_4 each contain sub-pixels of different colors. For example, pixel 122_1 contains a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B, and pixel 122_2 contains a white sub-pixel W, a red sub-pixel R, and a green sub-pixel G. Furthermore, the data line SDL coupled to the same first switching unit MUX2 is connected to the four different colored sub-pixels arranged in the same row. For example, the data line SDL coupled to the same first switching unit 125 is connected to the red sub-pixel R, green sub-pixel G, blue sub-pixel B, and white sub-pixel W arranged in the first pixel row. On the other hand, the data line SDL coupled to the same first switching unit 125 is connected to the blue sub-pixel B, white sub-pixel W, red sub-pixel R, and green sub-pixel G, and the blue sub-pixel B is arranged in the second pixel row. The displayed pixels per inch (PPI) is not equal to the number of dots per inch (DPI) for fingerprint recognition. The connection relationship between the data line SDL and the sub-pixels is shown in Figure 4 Therefore, it will not be repeated in this article.

[0092] In this embodiment, the electronic circuit 110 includes a plurality of first pins N2. The first pins N2 connected to the I / O pins N4 (second pins) of the display panel 120 constitute a first portion of the first pins N2, and the first pins N2 not connected to the I / O pins N4 (second pins) of the display panel 120 (i.e., I / O pins 101) constitute a second portion of the first pins N2. Specifically, the I / O pins 101 of the electronic circuit 110 are in a floating state and are not connected to the I / O pins N4 of the display panel 120. The driving and sensing channels 102 of the electronic circuit 110 do not operate during the display driving phase and the fingerprint sensing phase. In this embodiment, the second portions of the first pins N2 (i.e., I / O pins 101) are distributed in an interleaved manner among the first portions of the first pins N2. For example, for every six I / O pins N2, two I / O pins 101 are not connected to the I / O pins N4.

[0093] Since the driving and sensing channel 102 does not receive the fingerprint sensing signal S3, the raw data of the fingerprint sensing signal S3 received by the AFE circuit 163 may contain some interlaced image stripes. These interlaced image stripes do not contain fingerprint information. Therefore, a data remapping operation is performed in this disclosure to generate a fingerprint image.

[0094] Figure 5 and Figure 6 This illustrates an embodiment of the invention. Figure 4 A schematic diagram of an electronic device and its data remapping operation. (Reference) Figures 3 to 6The fingerprint sensing circuit 116 is configured to... Figure 5 The fingerprint sensing lines RX341 to RX610 receive the fingerprint sensing signal S3 corresponding to the fingerprint image FPI_1. The fingerprint sensing circuit 116 generates the fingerprint image FPI_1 based on the original data of the fingerprint sensing signal S3 through a data remapping operation. Figure 6 The raw data of the fingerprint sensing signal S3 includes multiple fingerprint image segments FPI_11 and FPI_12. When the data remapping operation is performed, the fingerprint sensing circuit 116 rearranges the fingerprint image segments FPI_11 and FPI_12 according to the order of fingerprint sensing lines RX341 to RX610 to generate fingerprint image FPI_1.

[0095] Specifically, fingerprint sensing lines RX341 to RX610 are selected for fingerprint sensing, and fingerprint sensing lines RX341 and RX610 respectively serve as the two boundaries of the fingerprint sensing area. The fingerprint sensing signal S3 carried on fingerprint sensing lines RX341 to RX610 is read out by AFE circuit 163 at once. AFE circuit 163 receives fingerprint sensing signal S3 from fingerprint sensing lines RX341 to RX610 in a one-time reception manner. That is, during the same fingerprint sensing phase, AFE circuit 163 receives fingerprint sensing signal S3 from all selected fingerprint sensing lines RX341 to RX610 at once. After the signal conversion operation, AFE circuit 163 transmits the fingerprint sensing signal S3 from fingerprint sensing channel CH1 to fingerprint sensing channel CH270 to... Figure 3 The digital circuit 161. In this embodiment, the AFE circuit 163 of the fingerprint sensing circuit 116 can be designed to have 270 fingerprint sensing channels and 1080 fingerprint sensing lines, i.e., fingerprint sensing lines RX1 to RX1080. Fingerprint sensing lines RX810 and RX811 are the boundaries of the fingerprint sensing area. The number of fingerprint sensing lines and the number of fingerprint sensing channels are only for illustrative purposes, and the present invention is not limited thereto.

[0096] Fingerprint image fragment FPI_11 is sensed by fingerprint sensors connected to fingerprint sensing lines RX341 to RX540 and transmitted to fingerprint sensing channels CH71 to CH270. Fingerprint image fragment FPI_12 is sensed by fingerprint sensors connected to fingerprint sensing lines RX541 to RX610 and transmitted to fingerprint sensing channels CH1 to CH70. Fingerprint sensing circuit 116 is configured according to... Figure 6The fingerprint image segments FPI_11 and FPI_12 are rearranged in the order of fingerprint sensing lines RX341 to RX540 and RX541 to RX610 to generate fingerprint image FPI_1, such that fingerprint image segment FPI_12 is moved from the left to the right of fingerprint image segment FPI_11. Therefore, a remapped fingerprint image FPI_1 is generated.

[0097] Additionally, since the driving and sensing channel 102 does not receive the fingerprint sensing signal S3, the fingerprint image fragment FPI_11 and fingerprint image fragment FPI_12 contain, as follows: Figure 6 The interlaced image stripe 600 shown is not included in the fingerprint information. Therefore, when the fingerprint sensing circuit 116 rearranges the fingerprint image segments FPI_11 and FPI_12, the fingerprint sensing circuit 116 further removes the interlaced image stripe 600 from the fingerprint image segments FPI_11 and FPI_12. That is, when the data remapping operation is performed, the interlaced image stripe 600 is simultaneously removed from the original data of the fingerprint sensing signal S3 to form the fingerprint image FPI_1. After the interlaced image stripe 600 is removed from the original data of the fingerprint sensing signal S3, the width of the fingerprint image FPI_1 contains 200 pixel columns.

[0098] Figure 7 This is a schematic diagram illustrating the wiring structure between an electronic circuit and a display panel according to another embodiment of the present invention. (Reference) Figure 7 In this embodiment, each pixel 122 of the display panel 120 includes a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. In this embodiment, the displayed PPI is equal to the DPI of fingerprint recognition. For example, the switching unit MUX2 is a 1:4 multiplexer. Additionally, the second portion of the first pin N2 (i.e., I / O pin 101) is concentrated between the first portions of the first pin N2. For example, the I / O pin 101 of the electronic circuit 110, which is not connected to the I / O pin N4 of the display panel 120, is assembled to the central portion of the chip side, such as... Figure 7 shown in.

[0099] Figure 8 and Figure 9 This is a schematic diagram illustrating a data remapping operation according to another embodiment of the present invention. (Reference) Figures 7 to 9 The fingerprint sensing circuit 116 is configured to... Figure 8Fingerprint sensing lines RX171 to RX800 receive fingerprint sensing signal S3 corresponding to fingerprint image FPI_2. Fingerprint sensing circuit 116 generates fingerprint image FPI_2 based on the original data of fingerprint sensing signal S3 through a data remapping operation. Figure 9 The raw data of the fingerprint sensing signal S3 includes multiple fingerprint image segments FPI_21, FPI_22, and FPI_23. Fingerprint image segments FPI_21, FPI_22, and FPI_23 do not contain interlaced image stripes. When the data remapping operation is performed, the fingerprint sensing circuit 116 rearranges the fingerprint image segments FPI_21, FPI_22, and FPI_23 according to the order of fingerprint sensing lines RX171 to RX800 to generate fingerprint image FPI_2.

[0100] Specifically, fingerprint sensing lines RX171 to RX360 and RX721 to RX800 are selected for fingerprint sensing, and fingerprint sensing lines RX171 and RX800 respectively serve as the two boundaries of the fingerprint sensing area. The fingerprint sensing signal S3 carried on fingerprint sensing lines RX171 to RX360 and RX721 to RX800 is read out by AFE circuit 163 at once. AFE circuit 163 receives fingerprint sensing signal S3 from fingerprint sensing lines RX171 to RX360 and RX721 to RX800 in a one-time reception manner. That is, during the same fingerprint sensing phase, AFE circuit 163 receives fingerprint sensing signal S3 from all selected fingerprint sensing lines RX171 to RX360 and RX721 to RX800 at once. After the signal conversion operation, AFE circuit 163 transmits the fingerprint sensing signal S3 from fingerprint sensing channel CH1 to fingerprint sensing channel CH270. Figure 3 Digital circuit 161.

[0101] Fingerprint image fragment FPI_21 is sensed by fingerprint sensors connected to fingerprint sensing lines RX171 to RX270 and transmitted to fingerprint sensing channels CH171 to CH270. Fingerprint image fragment FPI_22 is sensed by fingerprint sensors connected to fingerprint sensing lines RX271 to RX360 and transmitted to fingerprint sensing channels CH81 to CH170. Fingerprint image fragments are sensed by fingerprint sensors connected to fingerprint sensing lines RX721 to RX800 and transmitted to fingerprint sensing channels CH1 to CH80. Fingerprint sensing circuit 116 is configured according to... Figure 9 The fingerprint sensing lines RX171 to RX270, RX271 to RX360, and RX721 to RX800 shown are rearranged to generate fingerprint image segments FPI_21, FPI_22, and FPI_23 to produce fingerprint image FPI_2. Fingerprint image segments FPI_21, FPI_22, and FPI_23 are then remapped to produce fingerprint image FPI_2.

[0102] Figure 10 This is a flowchart illustrating the steps in a method for generating a fingerprint image according to an embodiment of the present invention. (Reference) Figure 3 and Figure 10 In this embodiment, a method for generating a fingerprint image is at least suitable for Figure 3 The electronic device 100 shown is not limited to this invention. Taking the electronic device 100 as an example, in step S100, the fingerprint sensing circuit 116 receives a fingerprint sensing signal S3 corresponding to the fingerprint image FPI_1 from the fingerprint sensing line FSL of the display panel 120. The fingerprint sensing signal S3 includes a plurality of fingerprint image segments FPI_11 and fingerprint image segments FPI_12. In step S110, the fingerprint sensing circuit 116 rearranges the fingerprint image segments FPI_11 and fingerprint image segments FPI_12 according to the order of the fingerprint sensing line FSL to generate the fingerprint image FPI_1.

[0103] Furthermore, the method for generating fingerprint images in this embodiment can be implemented in... Figures 1 to 9 Sufficient teaching, suggestions and implementation instructions have been obtained from the embodiments, and therefore no further description is provided herein.

[0104] In summary, in the embodiments of the present invention, display driving signals and fingerprint sensing signals are transmitted on the same transmission line at different stages. The transmission line is shared by both the display driving signals and the fingerprint sensing signals. The electronic circuitry outputs the display driving signals to the display panel and receives the fingerprint sensing signals from the display panel via the same pin connected to the transmission line. The wiring between the electronic circuitry and the display panel is relatively simple. The width of the fan-out area corresponding to the electronic circuitry and the size of the frame boundary in the display panel near the electronic circuitry are small. In addition, a data remapping operation is performed on the fingerprint image fragments to generate the entire fingerprint image, and interlaced image stripes are simultaneously removed from the original data of the fingerprint sensing signal.

[0105] It will be understood by those skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of this disclosure. In view of the foregoing, it is intended that this disclosure cover such modifications and variations, provided that they fall within the scope of the appended claims and their equivalents.

Claims

1. An electronic circuit adapted to drive a display panel including a plurality of fingerprint sensing lines, said electronic circuit comprising: A fingerprint sensing circuit is configured to receive a fingerprint sensing signal corresponding to a fingerprint image from the fingerprint sensing line. The fingerprint sensing signal includes multiple fingerprint image segments, and the fingerprint sensing circuit rearranges the fingerprint image segments according to the order of the fingerprint sensing lines to generate the fingerprint image. The electronic circuit further includes a plurality of first pins, and the display panel further includes a plurality of second pins connected to a first portion of the first pins via transmission lines, wherein the second portion of the first pins is in a floating state.

2. The electronic circuit of claim 1, wherein the fingerprint image segment includes interlaced image stripes, and when the fingerprint sensing circuit rearranges the fingerprint image segment, the fingerprint sensing circuit further removes the interlaced image stripes from the fingerprint image segment.

3. The electronic circuit according to claim 2, wherein the interlaced image stripes do not include fingerprint information.

4. The electronic circuit according to claim 1, wherein the second portion of the first pin is distributed in an alternating manner between the first portions of the first pin.

5. The electronic circuit according to claim 1, wherein the second portion of the first pin is concentrated between the first portions of the first pin.

6. The electronic circuit according to claim 5, wherein the fingerprint image fragment does not include interlaced image stripes.

7. A method for generating a fingerprint image, comprising: A fingerprint sensing signal corresponding to a fingerprint image is received from the fingerprint sensing line of the display panel, wherein the fingerprint sensing signal includes multiple fingerprint image segments, wherein the electronic circuit for driving the display panel includes multiple first pins, the display panel includes multiple second pins, which are connected to a first portion of the first pins via a transmission line, and the second portion of the first pins is in a floating state. as well as The fingerprint image fragments are rearranged according to the order of the fingerprint sensing lines to generate the fingerprint image.

8. The method for generating a fingerprint image according to claim 7, wherein the fingerprint image segment comprises interlaced image stripes, and the method further comprises: When the fingerprint image fragments are rearranged, the interlaced image stripes are removed from the fingerprint image fragments.

9. The method for generating a fingerprint image according to claim 8, wherein the interlaced image stripes do not include fingerprint information.

Images