Electronic Devices

Abstract

The present invention discloses an electronic device having a touch sensing mode and a fingerprint sensing mode, and the electronic device includes a substrate, a driving circuit, a fingerprint sensor and a touch signal line. The driving circuit is arranged on the substrate. The fingerprint sensor is arranged on the substrate, and the fingerprint sensor includes a first electrode and a second electrode, wherein the first electrode is electrically connected to the driving circuit. The touch signal line is arranged on the substrate and electrically connected to the second electrode.

Description

Technical Field

[0001] The present invention relates to an electronic device, and in particular to an electronic device with a touch sensing mode and a fingerprint sensing function. Background Art

[0002] The fingerprint recognition function allows users to use fingerprint recognition directly for identity recognition without having to remember passwords, which can provide convenience or security. Therefore, in recent years, the industry has been committed to integrating touch sensing, fingerprint sensing and display functions into the same electronic device, but there are still many problems to be solved. Summary of the invention

[0003] In one embodiment, the present invention provides an electronic device having a touch sensing mode and a fingerprint sensing mode, and the electronic device includes a substrate, a driving circuit, a fingerprint sensor, and a touch signal line. The driving circuit is disposed on the substrate. The fingerprint sensor is disposed on the substrate, and the fingerprint sensor includes a first electrode and a second electrode, wherein the first electrode is electrically connected to the driving circuit. The touch signal line is disposed on the substrate and electrically connected to the second electrode.

[0004] In another embodiment, the present invention provides an electronic device having a touch sensing mode and a fingerprint sensing mode, and the electronic device includes a substrate, a driving circuit, a touch electrode and a fingerprint sensor. The driving circuit, the touch electrode and the fingerprint sensor are arranged on the substrate, wherein the fingerprint sensor includes an electrode, which is arranged on the touch electrode and is electrically connected to the driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 Shown is a circuit diagram of an electronic device according to some embodiments of the present invention.

[0006] Figure 2 Shown along Figure 1 Schematic diagram of the structural cross-section along section lines A-A' and B-B'.

[0007] Figure 3 Shown is a circuit timing diagram of an electronic device according to some embodiments of the present invention.

[0008] Figure 4 Shown is a circuit diagram of an electronic device according to some embodiments of the present invention.

[0009] Figure 5 Shown along Figure 4 Schematic diagram of the structural cross-section along section lines C-C' and D-D'.

[0010] Figure 6 Shown is a circuit timing diagram of an electronic device according to some embodiments of the present invention.

[0011] Figure 7 Shown is a circuit diagram of an electronic device according to some embodiments of the present invention.

[0012] Figure 8 Shown along Figure 7 Schematic diagram of the structural cross-section along section lines E-E' and F-F'.

[0013] Fig. 9 Shown is a circuit timing diagram of an electronic device according to some embodiments of the present invention.

[0014] Explanation of reference numerals: 100, 200, 300-electronic device; 110-substrate; 120-circuit element layer; BE-first electrode; BF-buffer layer; BP-joint portion; BS-bias supply line; CL1-first conductive layer; CL2-second conductive layer; CL3-third conductive layer; CL4-fourth conductive layer; CL5-fifth conductive layer; CL6-sixth conductive layer; Cst-capacitor; Da-data line; DC-driving circuit; EM, Vbias, Vcom, Vdd, Vr, Vss-voltage source; FE-fingerprint sensing electrode; FS-fingerprint sensor; IN1, IN2, IN3, IN4, IN5, IN6-insulating layer; LD-light-emitting unit; LS-light shielding layer; P1, P2-position; PA-bonding pad; PDL-pixel definition layer; RO-signal readout line; SC-scan line; SC1-first scan line; SC2-second scan line; SCH-semiconductor channel layer; SG1-first signal; SG2-second signal; SM1-first semiconductor layer; SM2-second semiconductor layer; SM3-third semiconductor layer; T1-first switching element; T2-second switching element; T3-third switching element; T4-fourth switching element; T5-fifth switching element; T6-sixth switching element; TE-second electrode; TL-touch signal line; TP1-first timing; TP2-second timing; TP3-third timing; TS-touch electrode; Vf-voltage; X-node. DETAILED DESCRIPTION

[0015] The present invention can be understood by referring to the following detailed description in conjunction with the accompanying drawings. It should be noted that in order to facilitate the reader's understanding and simplify the drawings, the multiple drawings in the present invention only depict a portion of the electronic device, and the specific components in the drawings are not drawn according to the actual scale. In addition, the number and size of each component in the drawings are only for illustration and are not intended to limit the scope of the present invention.

[0016] Certain words are used in the description and claims of the present invention to refer to specific components. It should be understood by those skilled in the art that electronic equipment manufacturers may refer to the same components by different names. This document does not intend to distinguish between components that have the same function but different names. In the following description and claims, the words "include", "contain", "have" and the like are open-ended words, and therefore should be interpreted as "including but not limited to..." Therefore, when the terms "include", "contain" and / or "have" are used in the description of the present invention, they specify the existence of corresponding features, areas, steps, operations and / or components, but do not exclude the existence of one or more corresponding features, areas, steps, operations and / or components.

[0017] When a corresponding component such as a film layer or region is referred to as being "on another component (or its variant)", it can be directly on the other component, or other components may exist between the two. On the other hand, when a component is referred to as being "directly on another component (or its variant)", there is no component between the two.

[0018] It should be understood that when a component or a film layer is referred to as being "connected to" another component or a film layer, it can be directly connected to the other component or film layer, or there can be an intervening component or film layer between the two. When a component is referred to as being "directly connected to" another component or a film layer, there can be no intervening components or film layers between the two. In addition, when a component is referred to as being "coupled to another component (or a variation thereof)", it can be directly connected to the other component, indirectly connected (e.g., electrically connected) to the other component through one or more components.

[0019] The terms "about," "substantially," or "substantially" are generally interpreted as within 20% of a given value or range, or within 10%, 5%, 3%, 2%, 1% or 0.5% of a given value or range.

[0020] Although terms such as "first", "second", "third", etc. may be used to describe or name different components, these components are not limited to these terms. These terms are only used to distinguish one component from other components in the specification, and have nothing to do with the order in which these components are manufactured. The same terms may not be used in the claims, and may be replaced by "first", "second", "third", etc. according to the order in which the elements are declared in the claims. Accordingly, in the following description, the first component may be the second component in the claims.

[0021] It should be noted that the following embodiments may be implemented by replacing, reorganizing, or mixing features of several different embodiments without departing from the spirit of the present invention to implement other embodiments.

[0022] In the present invention, it can be any suitable type of electronic device, such as a touch display, an antenna device, a splicing device, a sensing device, a flexible device, etc., but not limited thereto. The electronic device described in the present invention is a touch display with a fingerprint recognition function, and its display may include liquid crystal (LC), organic light-emitting diode (OLED), inorganic light-emitting diode (LED) such as micro-LED (micro-LED, mini-LED), quantum dots (QDs), quantum dot light-emitting diode (QLED, QDLED), fluorescence, phosphorescence, other suitable materials or combinations of the above materials, but not limited thereto. The splicing device may be, for example, a display splicing device or an antenna splicing device, but not limited thereto. In the following, the display in the electronic device is described by taking a micro-light-emitting diode display as an example. In addition, the display in the electronic device may be a color display or a monochrome display, and the shape of the electronic device may be a rectangle, a circle, a polygon, a shape with curved edges, or other suitable shapes. In addition, the electronic device described below uses self-capacitance touch sensing as an example, but the touch sensing method is not limited to this, and a suitable touch sensing method can be used according to the needs. In another embodiment, the touch sensing element and the fingerprint sensor can also be mounted on the display to form an external touch display.

[0023] Since the electronic device of some embodiments of the present invention has the function of displaying images or pictures, the electronic device may include a plurality of sub-pixels arranged side by side. In some embodiments of the present invention, the display in the electronic device may be a color display, and the sub-pixels may include green, red and blue sub-pixels, or include green, red, blue and yellow sub-pixels, or include green, red, blue and white sub-pixels, thereby displaying a color picture through the light of different colors generated by the sub-pixels, but it is not limited to this, and the color of the light provided by the sub-pixels can be designed according to the needs. In some embodiments of the present invention, the display in the electronic device may be a monochrome display, and all sub-pixels may emit light of a single color, such as white, red or any suitable color. In addition, the top view shape of the sub-pixel may be a rectangle, a parallelogram, a ">" shape or any suitable shape.

[0024] Please refer to Figure 1 and Figure 2 , Figure 1 FIG. 1 is a schematic diagram of a circuit of an electronic device according to some embodiments of the present invention. Figure 2 Shown along Figure 1The schematic diagram of the structural cross-section of the section lines A-A' and B-B', where Figure 1 Only the circuit in one sub-pixel in the electronic device 100 is shown. Figure 1 The circuit shown is only an example, and the circuit design can be changed according to actual use requirements. Figure 1 and Figure 2 As shown, the electronic device 100 of some embodiments of the present invention includes a substrate 110, a driving circuit DC and a fingerprint sensor FS, and may selectively include a touch signal line TL, a touch electrode (transparent electrode) TS and a light-emitting unit LD. The material of the substrate 110 may include glass, quartz, sapphire, polymer (such as polyimide (PI), polyethylene terephthalate (PET)) and / or other suitable materials to serve as a flexible substrate or a hard substrate, but is not limited thereto.

[0025] In some embodiments of the present invention, the driving circuit DC, the fingerprint sensor FS, the touch signal line TL, the touch electrode TS and the light emitting unit LD are all disposed on the substrate 110, and the detailed connection method of these structures is as follows: Figure 1 As shown. Figure 1In the embodiment, the driving circuit DC may include a plurality of switch elements, a plurality of signal lines (such as data lines Da, scan lines SC, signal readout lines RO) and other required electronic elements (such as capacitors Cst), wherein the switch elements may be thin film transistors, and each switch element may be a P-type thin film transistor or an N-type thin film transistor, or a combination of an N-type thin film transistor and a P-type thin film transistor according to the circuit design requirements, but is not limited thereto. In addition, the electronic device 100 may also include a display control circuit (not shown), a fingerprint recognition control circuit (not shown) and a touch sensing control circuit (not shown). The display control circuit may be electrically connected to the data lines Da and the scan lines SC in the driving circuit DC, and provide the display grayscale signal to the light-emitting unit LD through the data lines Da, the scan lines SC and the switch elements, so that the light-emitting unit LD emits light of corresponding light intensity, thereby controlling the display screen. The fingerprint recognition control circuit is electrically connected to the signal readout line RO in the driving circuit DC, and obtains the fingerprint sensing signal through the signal readout line RO, the switch elements and the fingerprint sensor FS, thereby performing fingerprint recognition. The touch sensing control circuit is electrically connected to the touch electrode TS through the touch signal line TL to obtain the touch signal generated by the touch electrode TS, thereby performing touch sensing. In addition, the display control circuit, the fingerprint recognition control circuit, and the touch sensing control circuit can be designed according to actual needs. In some embodiments of the present invention, the display control circuit, the fingerprint recognition control circuit, and the touch sensing control circuit can be different circuit chips, but are not limited to this. In some embodiments, the display control circuit, the fingerprint recognition control circuit, and the touch sensing control circuit can be integrated into one control circuit chip.

[0026] like Figure 1As shown, the switch elements of the driving circuit DC may include a first switch element T1, a second switch element T2, a third switch element T3 and a fourth switch element T4 corresponding to the same sub-pixel, wherein the electrical connection of the display control circuit, the data line Da, the scan line SC, the first switch element T1, the second switch element T2, the third switch element T3, the capacitor Cst and the light-emitting unit LD can control the display screen, and the electrical connection of the fingerprint recognition control circuit, the signal readout line RO, the fourth switch element T4 and the fingerprint sensor FS can be used to obtain the fingerprint sensing signal for fingerprint recognition. In some embodiments of the present invention, the first switch element T1, the second switch element T2, the third switch element T3 and the fourth switch element T4 can all be P-type thin film transistors, but this is not limited to this, and the switch elements can be changed according to the circuit design requirements. The light-emitting unit LD may be any suitable light-emitting element and may vary according to the type of display in the electronic device 100. For example, the light-emitting unit LD may be an organic light-emitting diode (OLED), a micro light-emitting diode (micro-LED, mini-LED), a quantum dot light-emitting diode (QLED, QDLED) or other suitable light-emitting elements. In some embodiments of the present invention, the light-emitting unit LD may be a micro light-emitting diode, so that the display in the electronic device 100 is a micro light-emitting diode display.

[0027] In the present invention, the fingerprint sensor FS can sense the fingerprint in any suitable manner, and in some embodiments of the present invention, the fingerprint sensor FS includes a light sensor, such as a thin film transistor, a PN diode, a PIN diode or other suitable photoelectric conversion element, to detect the intensity of the reflected light reflected by the finger, so that the fingerprint recognition control circuit can obtain the characteristic point position of the fingerprint, thereby performing fingerprint recognition. In some embodiments of the present invention, the light sensor of the fingerprint sensor FS is exemplified by a PIN diode. In addition, each fingerprint sensor FS is respectively arranged in one of the sub-pixels, but the arrangement density and arrangement position of the fingerprint sensor FS can be designed according to actual needs. In some embodiments of the present invention, each sub-pixel has a fingerprint sensor FS, but it is not limited to this. In some embodiments, the sub-pixels located in a specific area will have a fingerprint sensor FS, but the sub-pixels located in other positions will not have a fingerprint sensor FS, but it is not limited to this. In some embodiments, it is not necessary for each sub-pixel to have a fingerprint sensor FS, for example, only one sub-pixel among three consecutive sub-pixels has a fingerprint sensor FS, that is, the density of the fingerprint sensor FS can be lower than the density of the sub-pixels, but it is not limited to this.

[0028] like Figure 1 and Figure 2As shown, the electronic device 100 may include a circuit element layer 120 disposed on a substrate 110, and the driving circuit DC, the fingerprint sensor FS, the data line Da, the scan line SC, the signal readout line RO, the touch signal line TL, the touch electrode TS and the light-emitting unit LD are all disposed in the circuit element layer 120. Specifically, the circuit element layer 120 may include at least one conductive layer, at least one insulating layer, at least one semiconductor layer and / or other required film layers to form the required circuit or electronic element. For example, the material of the conductive layer may include metal, transparent conductive material (such as indium tin oxide (ITO), indium zinc oxide (IZO), etc.), other suitable conductive materials or combinations thereof, but not limited thereto. The material of the insulating layer may include silicon oxide, silicon nitride, silicon oxynitride, other suitable insulating materials or combinations thereof, but not limited thereto. The semiconductor layer may include polycrystalline silicon, amorphous silicon, metal oxide semiconductor, other suitable semiconductor materials or combinations thereof, but not limited thereto.

[0029] In detail, Figure 2In the embodiment, the circuit element layer 120 may include a semiconductor channel layer SCH, a first conductive layer CL1, a second conductive layer CL2, a third conductive layer CL3, a fourth conductive layer CL4, a fifth conductive layer CL5 and a sixth conductive layer CL6, and the circuit element layer 120 further includes a plurality of insulating layers IN1, IN2, IN3, IN4, IN5 and IN6, so that at least part of the semiconductor channel layer SCH, at least part of the first conductive layer CL1, at least part of the second conductive layer CL2, at least part of the third conductive layer CL3, at least part of the fourth conductive layer CL4, at least part of the fifth conductive layer CL5 and at least part of the sixth conductive layer CL6 are separated from each other. In some embodiments of the present invention, the first conductive layer CL1, the second conductive layer CL2, the third conductive layer CL3, the fourth conductive layer CL4 and the sixth conductive layer CL6 are metal conductive layers, and the fifth conductive layer CL5 is a transparent conductive layer, but is not limited thereto. The semiconductor channel layer SCH may include semiconductor channels of each switch element, the first conductive layer CL1 may include scan lines SC and / or gates of each switch element, and the second conductive layer CL2 may include data lines Da and / or sources and drains of each switch element. It should be noted that, in some embodiments of the present invention, since the insulating layer IN1 is located between the gate of the switch element and the semiconductor channel, the insulating layer IN1 may serve as a gate insulating layer in the switch element. In addition, the capacitor Cst in the drive circuit DC may be formed by the conductive layer and the insulating layer in the circuit element layer 120; the signal readout line RO may be formed by one of the metal conductive layers in the circuit element layer 120, and may be directly electrically connected to the fourth switch element T4, or may be connected to one end of the fourth switch element T4 through a connecting structure, and the fingerprint sensor FS may be directly electrically connected to the fourth switch element T4, or may be connected to the fourth switch element T4 through a connecting structure.

[0030] exist Figure 2In the embodiment, the fingerprint sensor FS is disposed on the fourth switch element T4, and the PIN diode of the fingerprint sensor FS includes a first semiconductor layer SM1, a second semiconductor layer SM2 and a third semiconductor layer SM3, and the second semiconductor layer SM2 is located between the first semiconductor layer SM1 and the third semiconductor layer SM3, wherein the first semiconductor layer SM1 may be an N-type semiconductor layer, the second semiconductor layer SM2 may be an intrinsic semiconductor layer, and the third semiconductor layer SM3 may be a P-type semiconductor layer. The first semiconductor layer SM1, the second semiconductor layer SM2 and the third semiconductor layer SM3 may include amorphous silicon, polycrystalline silicon, metal oxide semiconductor, other suitable semiconductor materials or combinations thereof, but are not limited thereto. The materials of the first semiconductor layer SM1, the second semiconductor layer SM2 and the third semiconductor layer SM3 may be the same or different, but are not limited thereto. In addition, the fingerprint sensor FS also includes a first electrode BE and a second electrode TE located in the PIN diode, wherein the first electrode BE may be formed by the third conductive layer CL3 and electrically connected to one end of the fourth switch element T4 of the driving circuit DC, and the second electrode TE may be formed by the fifth conductive layer CL5, but are not limited thereto. In addition, the insulating layer IN4 can be used as a flat layer to flatten the surface unevenness caused by the placement of the fingerprint sensor FS.

[0031] In some embodiments of the present invention, the touch electrode TS may be formed by a fifth conductive layer CL5 including a transparent conductive material, and the touch electrode TS is located on the insulating layer IN4 or IN5, that is, the touch electrode TS and the second electrode TE of the fingerprint sensor FS may be formed by the same process. Figure 1 and Figure 2 As shown, the touch electrode TS and the second electrode TE of the fingerprint sensor FS may be electrically connected to each other. Figure 1 The touch electrodes TS and TS layers are connected to each other at position P1 and can be electrically connected to the same voltage source, such as a common voltage (Vcom), but are not limited thereto. In some embodiments of the present invention, the touch electrode TS can correspond to one or more sub-pixels, and the touch electrode TS layer corresponds to the circuit element layer 120 in the sub-pixel. In some embodiments of the present invention, the touch signal line TL can be formed by one of the metal conductive layers in the circuit element layer 120, such as Figure 2 The touch signal line TL in the embodiment may be formed by the fourth conductive layer CL4, and the touch signal line TL is electrically connected to the touch electrode TS. Figure 1 The touch sensing control circuit is connected to each other at the position P2 and is electrically connected to the second electrode TE of the fingerprint sensor FS through the touch electrode TS. That is, the touch sensing control circuit can be electrically connected to the second electrode TE of the fingerprint sensor FS through the touch signal line TL and the touch electrode TS.

[0032] like Figure 1 and Figure 2As shown, the light-emitting unit LD is connected to the third switch element T3. In some embodiments of the present invention, the bonding portion BP of the light-emitting unit LD is bonded to the bonding pad PA of the sixth conductive layer CL6 to be electrically connected to each other, but the formation method and setting position of the light-emitting unit LD are not limited thereto, and can be changed according to the type of the light-emitting unit LD or the circuit layout requirements. In other embodiments, when the light-emitting unit LD is, for example, an organic light-emitting diode, each film layer in the light-emitting unit LD can be formed in the circuit element layer 120 by, for example, a deposition process and a yellow light process, and the setting position of the light-emitting unit LD can be designed according to actual needs. The light-emitting unit LD in some embodiments of the present invention takes a flip chip form as an example, but is not limited thereto. In some embodiments, the light-emitting unit LD can be in a vertical form, and the circuit element layer 120 additionally includes a conductive layer located on the light-emitting unit LD to electrically connect the electrode of the light-emitting unit LD. In addition, in some embodiments of the present invention, the light emitting unit LD and the touch electrode TS may be integrated into the circuit element layer 120 on the substrate 110. Therefore, the electronic device 100 of some embodiments of the present invention may be an in-cell touch display, but is not limited thereto. In some embodiments of the present invention, the fingerprint sensor FS may also be integrated into the circuit element layer 120 on the substrate 110. In some embodiments of the present invention, the fingerprint sensor FS, the light emitting unit LD and the touch electrode TS may be integrated into the circuit element layer 120 on the substrate 110.

[0033] In addition, the circuit element layer 120 may also selectively include other required film layers and structures. In some embodiments of the present invention, the circuit element layer 120 may also include a pixel defining layer (PDL) for separating two adjacent light-emitting units LD in the normal direction of the substrate 110 and / or separating two adjacent sub-pixels in the normal direction of the substrate 110. Figure 2 In the embodiment, the pixel definition layer PDL is disposed adjacent to the light emitting unit LD and disposed on the touch electrode TS and the fingerprint sensor FS, but the present invention is not limited thereto. In some embodiments, the circuit element layer 120 may further include a buffer layer BF disposed between the semiconductor channel layer SCH and the substrate 110 to facilitate the formation and arrangement of the semiconductor channel layer SCH.

[0034] Circuit chips such as display control circuit, fingerprint recognition control circuit, touch sensing control circuit, etc. can be arranged on the circuit element layer 120 by bonding, and electrically connected to the electronic components in the circuit element layer 120, but not limited thereto. In some embodiments, the display control circuit, fingerprint recognition control circuit, and touch sensing control circuit can also be directly formed in the circuit element layer 120 by deposition process, photolithography process, and etching process. In addition, the configuration of each film layer in the circuit element layer 120 and the film layer used by the electronic components can be adjusted according to the needs, and are not limited to the above.

[0035] The electronic device 100 may also include other required film layers and structures depending on its type, such as optical film layers (such as polarizers), light-shielding layers, color conversion layers (including filter materials and / or quantum dots), dielectric layers (such as liquid crystal layers) and / or backlight layers, and set them in appropriate positions according to needs.

[0036] Some embodiments of the present invention include Figure 3 It should be noted that the profile of the circuit signal can be of any suitable type. Figure 3 The circuit signal shown is a square wave, but is not limited thereto. Figure 3 The square wave shown is an ideal square wave, but in practical applications, the provided square wave signal may be a non-ideal square wave with noise, ripple effect and / or ringing effect. Figure 3 The signal sizes of the circuit signals shown are for reference only. The size relationship of each signal is not Figure 3 The examples shown are limited to Figure 3 The actual fingerprint sensing signal and touch sensing signal are not shown. Figure 1 and Figure 3 As shown, the electronic device 100 of some embodiments of the present invention has a touch sensing mode and a fingerprint sensing mode, and has a screen display function, and the touch sensing function, the fingerprint sensing function and the screen display function can be integrated into the same circuit. Figure 3 It should be noted that Figure 3 In the embodiment, the operation of the electronic device 100 is divided into a first timing sequence TP1 and a second timing sequence TP2 which are alternately performed.

[0037] Some embodiments of the present invention include Figure 1 and Figure 3As shown, regarding the part of the picture display, in the first timing TP1, the scan line SC can provide an on signal (e.g., a low voltage) to turn on the first switch element T1, and the voltage source EM can provide an off signal (e.g., a high voltage) to turn off the third switch element T3. Therefore, the signal provided by the display control circuit can be stored in the capacitor Cst through the data line Da and the first switch element T1. Then, in the second timing TP2, the scan line SC can provide an off signal (e.g., a high voltage) to turn off the first switch element T1, and the voltage source EM can provide an on signal (e.g., a low voltage) to turn on the third switch element T3, so that the current can flow from the voltage source Vdd through the second switch element T2 and the third switch element T3 to the light emitting unit LD, and the light emitting unit LD can emit light with a corresponding light intensity according to the signal stored in the capacitor Cst, thereby performing picture display.

[0038] Some embodiments of the present invention include Figure 1 and Figure 3As shown, regarding the fingerprint sensing part, in the first timing TP1, the scan line SC turns on the first switch element T1 and the fourth switch element T4 when providing the start signal, and the voltage source Vcom can provide, for example, a ground voltage. In some embodiments of the present invention, since the specific voltage Vx provided by the fingerprint recognition control circuit at the node X (which can be regarded as charging the node X to the specific voltage Vx) and the ground voltage provided by the voltage source Vcom are reverse biased for the fingerprint sensor FS, the fingerprint recognition control circuit can charge the fingerprint sensor FS to the specific voltage Vx through the signal readout line RO. Then, in the second timing TP2, the scan line SC turns off the first switch element T1 and the fourth switch element T4, and the light emitting unit LD emits light, so that the finger can reflect the light emitted by the light emitting unit LD, and the fingerprint sensor FS can generate a corresponding current according to the intensity of the reflected light of the finger, so that the specific voltage Vx of the node X changes. It is worth mentioning that, since the light intensity of the light reflected by the finger will be different according to the fingerprint contour of the finger (for example, the light intensity reflected by the ridge may be greater than the light intensity reflected by the valley), and the fingerprint sensor FS will generate different currents due to the different light intensities of the reflected light, the voltage change amplitude of the node X will correspond to the fingerprint contour of the corresponding area of ​​the finger. Then, in the next first timing TP1, the fourth switch element T4 will be turned on again, so that the fingerprint recognition control circuit can charge the fingerprint sensor FS through the signal readout line RO, so that the voltage of the node X is restored to the specific voltage Vx, and the fingerprint recognition control circuit can simultaneously detect the charge amount for the node X to know the voltage change amplitude of the node X, and then obtain the fingerprint contour of this area. Finally, the fingerprint recognition control circuit performs fingerprint recognition based on the detection results of all fingerprint sensors FS. It can be seen that in the fingerprint sensing mode, the second timing TP2 enables the fingerprint sensor FS to detect the light intensity of the light reflected by the finger to obtain the fingerprint signal, and the first timing TP1 is used to read the fingerprint signal obtained by the fingerprint sensor FS.

[0039] Some embodiments of the present invention include Figure 1 and Figure 3As shown, the touch sensing part performs touch sensing in the second timing TP2. When performing touch sensing, the touch sensing control circuit controls the voltage source Vcom to provide at least one first signal SG1 to the touch electrode TS. Since the touch electrode TS and the touch signal line TL are electrically connected to each other, the first signal SG1 is also provided to the touch signal line TL. When the user touches the electronic device 100, the touch electrode TS is transmitted back to the touch sensing control circuit through the touch signal line TL, and the touch sensing control circuit can know the user's touch position based on the difference between the signal transmitted back by the touch signal line TL and the first signal SG1, thereby performing touch sensing. It is worth mentioning that since the touch electrode TS corresponds to the circuit element layer 120 in the sub-pixel, when the touch electrode TS receives the first signal SG1, other electronic components will cause a change in load (loading) due to the change in the voltage difference between the touch electrode TS and the touch electrode TS, and cause an unwanted coupling phenomenon between the electronic components and the touch electrode TS. In order to reduce the occurrence of the above situation, the voltage source Vdd, Vss, EM or signal source (such as display control circuit, fingerprint recognition control circuit) of some embodiments of the present invention will provide a signal corresponding to the first signal SG1 to the connected electronic element (such as the display control circuit provides this signal to the scan line SC and the data line Da, and the fingerprint recognition control circuit provides this signal to the signal readout line RO) at the same time as the touch sensing control circuit provides the first signal SG1, wherein these signals will be superimposed with the original voltage provided by the voltage source or signal source. For example, the fingerprint recognition control circuit can provide the second signal SG2 to the signal readout line RO, and superimpose it with the original voltage Vf provided by the fingerprint recognition control circuit, and the first signal SG1 and the second signal SG2 are synchronized with each other. Accordingly, through the above design, the voltage difference between the electronic element and the touch electrode TS can be maintained to reduce the influence of the load and coupling phenomenon on the circuit, so as to improve the reliability of the touch sensing function, the display function and the fingerprint recognition function. It should be noted that the two signals mentioned above are “synchronized” not only in that the two signals are identical in time, but also in that the waveforms and amplitudes of the signals are identical to each other. The two signals are considered “identical” when the errors in the time points, periods, waveforms and amplitudes provided by the two signals are less than 10%, 5%, 3%, 2%, 1% or 0.5%.

[0040] In addition, in some embodiments of the present invention, since the touch sensing mode is performed in the second timing TP2, the light emitting unit LD will emit light when the touch sensing mode is performed, but it is not limited to this. In some embodiments, the timing of the touch sensing mode may not overlap with the timing of the light emitting unit LD emitting light. In addition, since the touch electrode TS and the second electrode TE of the fingerprint sensor FS in some embodiments of the present invention are electrically connected to each other, in order to reduce the impact on fingerprint sensing in the touch sensing mode, the fourth switch element T4 electrically connected to the first electrode BE of the fingerprint sensor FS is in a closed state in the touch sensing mode to reduce the fingerprint recognition control circuit receiving the fingerprint sensing signal affected by the touch sensing signal, thereby improving the reliability of fingerprint recognition. In addition, the first signal SG1 provided by the touch sensing control circuit should not be too large to turn on the diode of the fingerprint sensor FS to reduce the impact on the accuracy of fingerprint sensing.

[0041] In some embodiments of the present invention, the fingerprint sensor FS can be integrated into the sub-pixel, that is, the fingerprint sensing and touch sensing of some embodiments of the present invention are both located within the range of the display screen, so under this design, it is convenient for users to use the touch sensing function and fingerprint sensing function of the electronic device 100. In addition, the circuit design is not limited to the above, and can be adjusted and designed according to needs.

[0042] In some embodiments of the present invention, the electronic device may be an external touch display. Specifically, in some embodiments of the present invention, the substrate 110 and the circuit element layer 120 may be externally mounted on the display, but the circuit element layer 120 does not include the light-emitting unit LD for displaying the image and its corresponding electronic components (such as the first switch element T1, the second switch element T2, the third switch element T3, the data line Da, the display control circuit, etc.). Figure 3 In the timing diagram shown, the signal provided by the data line Da, the voltage source EM, Vss, and Vdd can be ignored, and the function of displaying the picture can be provided by the display. In addition, the display of the electronic device of some embodiments of the present invention can be any suitable display, such as a liquid crystal display, an organic light emitting diode display, a micro light emitting diode display, a quantum dot material display, but not limited thereto. It should be noted that although the touch electrode TS and the fingerprint sensor FS are externally mounted on the display, the setting position of the touch electrode TS and the fingerprint sensor FS can still correspond (for example, overlap) within the range of the display screen of the display.

[0043] In another variant embodiment, the electronic device may not have a display function, such as an antenna device (such as a liquid crystal antenna). Therefore, the circuit element layer 120 does not include the light-emitting unit LD for displaying the image and its corresponding electronic element. Figure 3In the timing diagram shown, the signal provided by the data line Da, the voltage source EM, Vss, and Vdd can be ignored.

[0044] The electronic devices of some embodiments of the present invention are not limited to the above embodiments. Some embodiments will be further disclosed below. However, in order to simplify the description and highlight the differences between some embodiments of the present invention, the same reference numerals are used below to mark the same elements, and the repeated parts will not be repeated.

[0045] Please refer to Figure 4 and Figure 5 , Figure 4 FIG. 1 is a schematic diagram of a circuit of an electronic device according to some embodiments of the present invention. Figure 5 Shown along Figure 4 The schematic diagram of the structural section of the section lines C-C' and D-D', where Figure 4 Only the circuit in one sub-pixel of the electronic device 200 is shown. Figure 4 As shown, the difference between the electronic device 200 of this embodiment and the above-mentioned embodiments lies in the design of the fingerprint sensing circuit. Specifically, the switch elements of the driving circuit DC may further include a fifth switch element T5 and a sixth switch element T6 corresponding to the same sub-pixel, and the electrical connection between the fingerprint recognition control circuit, the signal readout line RO, the fourth switch element T4, the fifth switch element T5, the sixth switch element T6 and the fingerprint sensor FS may be used to obtain the fingerprint sensing signal for fingerprint recognition. In addition, Figure 4 In the embodiment, the scan line SC may include a first scan line SC1 and a second scan line SC2, the first scan line SC1 is electrically connected to the gates of the first switch element T1 and the fourth switch element T4, and the second scan line SC2 is electrically connected to the gate of the sixth switch element T6. Figure 4 and Figure 5 In the embodiment, the touch electrode TS and the second electrode TE of the fingerprint sensor FS are electrically connected to each other at a position P1, the touch electrode TS and the touch signal line TL are electrically connected to each other at a position P2, and the touch electrode TS is electrically connected to a voltage source Vbias.

[0046] Please refer to Figure 4 and Figure 6 ,like Figure 6 FIG. 1 is a circuit timing diagram of an electronic device according to some embodiments of the present invention. It should be noted that the profile of the circuit signal can be of any suitable type. Figure 6 The circuit signal shown is a square wave, but is not limited thereto. Figure 6 The square wave shown is an ideal square wave, but in practical applications, the provided square wave signal may be a non-ideal square wave with noise, fluctuation effect and / or ringing effect. Figure 6 The signal sizes of the circuit signals shown are for reference only. The size relationship of each signal is not Figure 6The examples shown are limited to Figure 6 The actual fingerprint sensing signal and touch sensing signal are not shown. Figure 4 The switch elements T1 to T6 shown are all N-type thin film transistors. Figure 1 As shown (the switch elements T1 to T4 are all P-type thin film transistors), the relationship between the gate switching signals (such as the signal provided by the display control circuit to the scan line SC and the signal provided by the voltage source EM) will be opposite, but the type of switch element is not limited to this. Figure 4 and Figure 6 In the embodiment, the operation of the electronic device 200 is divided into a first timing sequence TP1, a second timing sequence TP2 and a third timing sequence TP3 alternately, wherein the display control circuit can charge the capacitor Cst in the first timing sequence TP1, and the light emitting unit LD can emit light in the second timing sequence TP2 and the third timing sequence TP3, and the driving method of the detailed screen display is generally similar to Figure 3 As shown, no further repetition is given here. Figure 4 and Figure 6 The touch sensing is performed at the second timing TP2, wherein the first signal SG1 of the touch electrode TS is provided by the touch sensing control circuit through the voltage source Vbias, and the detailed driving method of the touch sensing is substantially similar to Figure 3 As shown, no further repetition is given here.

[0047] Regarding the fingerprint sensing part, such as Figure 4 and Figure 6 As shown, in the third timing sequence TP3, the second scan line SC2 provides an on signal to turn on the sixth switch element T6, and the voltage provided by the voltage source Vr and the voltage source Vbias is a reverse bias for the fingerprint sensor FS, so the node X can be charged to the voltage Vxs. It should be noted that since the light-emitting unit LD emits light in the third timing sequence TP3, the fingerprint sensor FS will generate a current in accordance with the intensity of the finger reflected light sensed in the third timing sequence TP3, thereby affecting the voltage Vxs of the node X, that is, the value of the voltage Vxs will correspond to the intensity of the finger reflected light, and thus correspond to the fingerprint contour of the specific area. Then, in the first timing sequence TP1, the first scan line SC1 provides an on signal to turn on the first switch element T1 and the fourth switch element T4, and the current through the fourth switch element T4 and the fifth switch element T5 will be generated in accordance with the voltage Vxs, so the fingerprint recognition control circuit can obtain the fingerprint contour according to the magnitude of this current, and then perform fingerprint recognition.

[0048] Please refer to Figure 5 , the arrangement of some structures of some embodiments of the present invention is different from Figure 2 For example, Figure 5The touch signal line TL in the fingerprint sensor FS may be formed by the third conductive layer CL3, and the second electrode TE of the fingerprint sensor FS may be formed by other conductive layers (such as transparent conductive materials) and electrically connected to the touch electrode TS formed by the fifth conductive layer CL5 at the position P1. Figure 5 The circuit element layer 120 may also selectively include a light shielding layer LS, which may be disposed between the buffer layer BF and the substrate 110. In addition to reducing the chance of a portion of the semiconductor channel layer SCH being irradiated by light from one side of the substrate 110, the switch element may also be selectively turned into a dual gate thin film transistor, thereby reducing leakage current or improving the characteristics of the switch element. In addition, Figure 5 The fifth switch element T5 is used to amplify the fingerprint signal, and the channel width-to-length ratio (W / L) of the fifth switch element T5 may be different from the channel width-to-length ratio (W / L) of other switch elements. For example, the channel width-to-length ratio of the fifth switch element T5 may be 0.5 to 1 times the channel width-to-length ratio of other switch elements.

[0049] Please refer to Figure 7 and Figure 8 , Figure 7 FIG. 1 is a schematic diagram of a circuit of an electronic device according to some embodiments of the present invention. Figure 8 Shown along Figure 7 The schematic diagram of the structural section of the section lines E-E' and F-F', where Figure 7 Only the circuit in one sub-pixel in the electronic device 300 is shown. Figure 7 and Figure 8 As shown, the difference between the electronic device 300 and the electronic device 100 lies in the type of fingerprint sensor FS and the corresponding circuit design. In some embodiments of the present invention, the fingerprint sensor FS includes a capacitive sensor for coupling with the charge on the finger to form a capacitor, and the circuit electrically connected to the capacitive sensor can be used to detect the capacitance value between the capacitive sensor and the finger. The fingerprint recognition control circuit can obtain the fingerprint contour according to the capacitance value and then perform fingerprint recognition.

[0050] like Figure 7 As shown, in the driving circuit DC, the switch element may further include a fifth switch element T5 corresponding to the same sub-pixel, and the scan line SC includes a first scan line SC1 and a second scan line SC2, the first scan line SC1 is electrically connected to the gate of the first switch element T1 and the fourth switch element T4, the second scan line SC2 is electrically connected to the gate of the fifth switch element T5, and the fingerprint sensor FS is electrically connected between the fourth switch element T4 and the fifth switch element T5, but not limited thereto. In addition, the driving circuit DC further includes a bias supply line BS electrically connected to the fourth switch element T4, and the signal readout line RO is electrically connected to the fifth switch element T5.

[0051] like Figure 7 and Figure 8 As shown, structurally, the fingerprint sensor FS includes a fingerprint sensing electrode FE, which is disposed on the touch electrode TS and electrically connected between the fourth switch element T4 and the fifth switch element T5 of the driving circuit DC. In some embodiments of the present invention, the fingerprint sensing electrode FE overlaps the touch electrode TS in the top view direction, but is not limited to this. In addition, in some embodiments of the present invention, the fourth conductive layer CL4 and the fifth conductive layer CL5 include a transparent conductive material, the touch electrode TS is formed by the fourth conductive layer CL4, and the fingerprint sensing electrode FE is formed by the fifth conductive layer CL5, but is not limited to this. It should be noted that another difference between some embodiments of the present invention and some embodiments of the present invention is that the touch electrode TS and the electrode of the fingerprint sensor FS (some embodiments of the present invention, namely the fingerprint sensing electrode FE) are not formed by the same film layer, nor are they electrically connected to each other. In addition, the touch signal line TL in some embodiments of the present invention can be formed by the third conductive layer CL3, for example, but is not limited to this.

[0052] Please refer to Fig. 9 , and also refer to Figure 7 , Fig. 9 FIG. 1 is a circuit timing diagram of an electronic device according to some embodiments of the present invention. It should be noted that the profile of the circuit signal can be of any suitable type. Fig. 9 The circuit signal shown is a square wave, but is not limited thereto. Fig. 9 The square wave shown is an ideal square wave, but in practical applications, the provided square wave signal may be a non-ideal square wave with noise, fluctuation effect and / or ringing effect. Fig. 9 The signal sizes of the circuit signals shown are for reference only. The size relationship of each signal is not Fig. 9 The examples shown are limited to Fig. 9 In some embodiments of the present invention, the operation of the electronic device 300 can be divided into the first timing TP1, the second timing TP2 and the third timing TP3 alternately, wherein the display control circuit can charge the capacitor Cst in the first timing TP1, and the light emitting unit LD can emit light in the second timing TP2 and the third timing TP3, and the driving method of the detailed screen display is generally similar to some embodiments of the present invention described above, so it will not be repeated here.

[0053] Regarding the fingerprint sensing part, such as Figure 7 and Fig. 9As shown, in the first timing sequence TP1, when the first scan line SC1 provides an on signal to turn on the fourth switch element T4, the fingerprint recognition control circuit can provide a bias to the fingerprint sensor FS through the bias supply line BS and the fourth switch element T4, and the fingerprint sensor FS can store corresponding charges according to the capacitance between the fingerprint sensing electrode FE and the finger, wherein the capacitance between the fingerprint sensing electrode FE and the finger will change according to the fingerprint contour of the corresponding area, for example, the capacitance between the ridge and the fingerprint sensing electrode FE is greater than the capacitance between the valley and the fingerprint sensing electrode FE. In the third timing sequence TP3, the second scan line SC2 can provide an on signal to turn on the fifth switch element T5, so that the fingerprint recognition control circuit can detect the capacitance between the fingerprint sensing electrode FE and the finger through the signal readout line RO and the fifth switch element T5, thereby performing fingerprint recognition.

[0054] The touch sensing of some embodiments of the present invention is performed in the second timing TP2, and the detailed driving method of the touch sensing is generally similar to some embodiments of the present invention described above, so it will not be repeated here. It should be noted that although the fingerprint sensing electrode FE of the fingerprint sensor FS is structurally arranged on the touch electrode TS and overlaps the touch electrode TS in the top view direction, because the fourth switch element T4 and the fifth switch element T5 are in the closed state in the second timing TP2, the fingerprint sensing electrode FE is in a floating state, so it will not affect the function of the touch electrode TS located below the fingerprint sensing electrode FE to sense the touch of the finger.

[0055] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electronic device, characterized in that: The electronic device has a touch sensing mode and a fingerprint sensing mode, and the electronic device includes: a substrate; a driving circuit, disposed on the substrate; a fingerprint sensor disposed on the substrate, and comprising a first electrode and a second electrode, wherein the first electrode is electrically connected to the driving circuit; a touch signal line, disposed on the substrate and electrically connected to the second electrode; a light emitting unit; a first switch element, electrically connected to the light emitting unit; a data line electrically connected to the first switch element; and A control circuit is provided, wherein the control circuit provides a first signal to the touch signal line, the control circuit provides a second signal to the data line, and the first signal and the second signal are synchronized in the touch sensing mode.

2. The electronic device according to claim 1, wherein: It also includes a transparent electrode, wherein the touch signal line is electrically connected to the second electrode through the transparent electrode.

3. The electronic device according to claim 1, wherein: The light emitting unit is electrically connected to the driving circuit.

4. The electronic device as claimed in claim 3, characterized in that: The light emitting unit emits light in the touch sensing mode.

5. The electronic device according to claim 1, wherein: The fingerprint sensor includes a light sensor.

6. The electronic device as claimed in claim 1, characterized in that: The invention also includes a signal readout line electrically connected to the fingerprint sensor, wherein the control circuit provides a third signal to the signal readout line, and the first signal and the third signal are synchronized in the touch sensing mode.

7. The electronic device according to claim 1, wherein: The second electrode of the fingerprint sensor includes a transparent conductive material.

8. The electronic device as claimed in claim 1, wherein: The driving circuit includes a second switch element electrically connected to the first electrode of the fingerprint sensor, and in the touch sensing mode, the second switch element in the driving circuit is in a closed state.

9. An electronic device, characterized in that: The electronic device has a touch sensing mode and a fingerprint sensing mode, and the electronic device includes: a substrate; a driving circuit, disposed on the substrate; A touch electrode, disposed on the substrate; a fingerprint sensor disposed on the substrate, wherein the fingerprint sensor comprises a fingerprint sensing electrode disposed on the touch electrode and electrically connected to the driving circuit; a touch signal line electrically connected to the touch electrode; a light emitting unit; a first switch element, electrically connected to the light emitting unit; a data line electrically connected to the first switch element; and A control circuit is provided, wherein the control circuit provides a first signal to the touch signal line, the control circuit provides a second signal to the data line, and the first signal and the second signal are synchronized in the touch sensing mode.

10. The electronic device according to claim 9, wherein: The fingerprint sensor includes a capacitive sensor.

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