TWI696059B - Electronic device and fingerprint sensing method - Google Patents

Abstract

An electronic device and a fingerprint sensing method are provided. The electronic device includes a display panel, a fingerprint sensor, and an integrated driver chip. The display panel includes a plurality of pixel units arranged in an array. The integrated driver chip integrates a display driving circuit and a fingerprint sensing circuit. When the pixel units of the display panel are in an undriven state and a finger object contacts a sensing area of the display panel to perform a fingerprint unlocking operation, the display driving circuit drives at least a portion of the pixel units corresponding to the sensing area, so that at least a portion of the pixel units provide illumination light to the sensing area. The fingerprint sensing circuit drives the fingerprint sensor to capture a fingerprint feature image of the finger object.

Description

Electronic device and fingerprint sensing method

The invention relates to a fingerprint sensing technology, and in particular to an electronic device and fingerprint sensing method using an off-screen fingerprint sensing technology.

For an active-matrix organic light-emitting diode (AMOLED) display with an electronic under-screen fingerprint sensor, the general fingerprint unlocking mechanism is the operating system of the electronic device. The driving instruction is output to first light the AMOLED display and provide illumination light to the finger object pressed on the AMOLED display. Then, the operating system of the electronic device outputs another driving command to drive the fingerprint sensor to capture the fingerprint characteristic image. Finally, the operating system of the electronic device analyzes the fingerprint feature image to determine whether to perform the unlock operation. However, the reaction speed of the general fingerprint unlocking mechanism is too slow, and the AMOLED display is often lighted up from the beginning, and continues until the unlocking operation is completed, so that the power of the electronic device is wasted. In view of this, the following will propose solutions of several example embodiments.

The invention provides an electronic device and a fingerprint sensing method, which can quickly drive a display panel and a fingerprint sensor by an integrated driving chip, and can only drive a part of the pixel units corresponding to the sensing area of the display panel to provide a fingerprint Light source needed for sensing. Therefore, the electronic device and fingerprint sensing method of the present invention can have the effects of reducing power consumption and rapid sensing.

An electronic device of the present invention includes a display panel, a fingerprint sensor, and an integrated driving chip. The display panel includes a plurality of pixel units arranged in an array. The fingerprint sensor is arranged below the sensing area of the display panel. The integrated driving chip is coupled to the display panel and the fingerprint sensor, and integrates the display driving circuit and the fingerprint sensing circuit. The display driving circuit is used to drive the display panel, and the fingerprint sensing circuit is used to drive the fingerprint sensor. When the pixel units of the display panel are in an undriven state, and a finger object touches the sensing area of the display panel to perform a fingerprint unlocking operation, the display driving circuit drives at least a part of the pixel units corresponding to the sensing area, so that these At least a portion of the pixel unit provides illumination light to the sensing area. The fingerprint sensing circuit drives the fingerprint sensor to capture the fingerprint image of the finger object.

The fingerprint sensing method of the present invention is suitable for electronic devices. The electronic device includes a display panel, a fingerprint sensor, and an integrated driver chip. The display panel includes a plurality of pixel units arranged in an array. The fingerprint sensing method includes the following steps: when the pixel units of the display panel are in an undriven state, and a finger object touches the sensing area of the display panel to perform a fingerprint unlocking operation, by the display driver integrated in the integrated driver chip The circuit drives at least a part of the pixel units corresponding to the sensing area, so that at least a part of the pixel units provide illumination light to the sensing area; and the fingerprint sensing circuit is driven by the fingerprint sensing circuit integrated in the integrated driving chip Sensor to capture the fingerprint image of finger objects.

Based on the above, the electronic device and the fingerprint sensing method of the present invention can drive the display panel and the fingerprint sensor through the integrated driving chip integrating the display driving circuit and the fingerprint sensing circuit, and when performing fingerprint sensing, it can immediately Driving some pixel units corresponding to the sensing area of the display panel, but not driving other pixel units outside the sensing area, so as to achieve the effects of reducing power consumption and rapid sensing.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

In order to make the content of the present invention easier to understand, the following specific embodiments are taken as examples on which the present invention can indeed be implemented. In addition, wherever possible, elements/components/steps with the same reference numerals in the drawings and embodiments represent the same or similar components.

FIG. 1 is a block diagram of an electronic device according to an embodiment of the invention. Referring to FIG. 1, the electronic device 100 includes a display panel 110, an integrated driving chip 120 and a fingerprint sensor 130. The integrated driving chip 120 is coupled to the display panel 110 and the fingerprint sensor 130. In this embodiment, the integrated driving chip 120 is a system on chip (SoC), and the integrated driving chip 120 integrates the display driving circuit 121 and the fingerprint sensing circuit 122. The display driving circuit 121 is used to drive the display panel 110. The fingerprint sensing circuit 122 is used to drive the fingerprint sensor 130.

In this embodiment, the electronic device 100 can be a portable electronic product that uses Under-display optical fingerprint technology, such as a mobile phone, a tablet, or a notebook computer ( Laptop), etc., the present invention is not limited to this. In this embodiment, the display panel 110 may be an active-matrix organic light-emitting diode (AMOLED), and have a plurality of pixel units arranged in an array. In this embodiment, the fingerprint sensor 130 may be an optical under-screen fingerprint sensor, and includes a complementary metal-oxide-semiconductor (CMOS) sensor. In this embodiment, the circuit of the fingerprint sensor 130 disposed under the sensing area of the display panel 110 can be integrated with the display driving circuit 121 as a system on chip. Therefore, when the electronic device 100 performs a fingerprint unlocking operation, the display driving circuit 121 may individually light at least a part of these pixel units in the sensing area corresponding to the fingerprint sensing circuit 122 on the display panel 110.

It should be noted that the above fingerprint unlocking operation refers to when the electronic device 100 operates in a screen locked state, a hibernation state, a sleep state or a protected state, etc., if the user wishes to restore or operate the application function of the electronic device 100, then The user must first authenticate or unlock the screen. Therefore, the electronic device 100 needs to perform identity authentication or screen unlocking through fingerprint identification.

2 is a schematic diagram of an electronic device according to an embodiment of the invention. Referring to FIGS. 1 and 2, the electronic device 100 may be a mobile phone as shown in FIG. 2. The display surface of the electronic device 100 faces the third direction P3. The first direction P1, the second direction P2, and the third direction P3 are perpendicular to each other. In this embodiment, when the electronic device 100 operates in a screen locked, standby, or sleep state, if the user wants to use the electronic device 100, the user must first unlock to enter the operating system screen of the electronic device 100. At this time, the display panel 110 has not been lit, and these pixel units of the display panel 110 are in an undriven state. However, when a finger object (user's finger) contacts (or presses) the sensing area 101 of the display panel 110 to perform a fingerprint unlocking operation, the display driving circuit 121 drives at least a part of the pixel units corresponding to the sensing area 101 , So that at least a part of these pixel units provide illumination light to the sensing area 101. Next, the fingerprint sensing circuit 122 drives the fingerprint sensor to capture the fingerprint image of the finger object. In this embodiment, the processor of the electronic device 100 will perform fingerprint identification based on the fingerprint feature image to determine whether to unlock the screen or enter the operating system screen of the electronic device 100.

That is, when the electronic device 100 performs a fingerprint unlocking operation, the display driving circuit 121 may individually light at least a part of these pixel units in the sensing area 101 corresponding to the fingerprint sensing circuit 122 on the display panel 110. Moreover, the non-sensing area 102 of the display panel 110 corresponds to another part of these pixel units, and when the electronic device 100 performs a fingerprint unlocking operation, the other part of these pixel units corresponding to the non-sensing area 102 maintains an undriven state. In this embodiment, the sensing area 101 of the display panel 110 is smaller than the non-sensing area 102. The display area of the display panel 110 includes a sensing area 101 and a non-sensing area 102. In other words, the sensing area 101 of the display panel 110 is smaller than the display area.

It is worth noting that in this embodiment, the display panel 110 may be an active matrix organic light-emitting display, so the pixel units of the display panel 110 may include multiple color pixel types (such as red, blue, and green). Therefore, when a finger object touches the sensing area 101 of the display panel 110 for a fingerprint unlocking operation, at least a part of the pixel units driven by the display driving circuit 121 may be at least one of the color pixel types. In other words, when the electronic device 100 performs the fingerprint unlocking operation, the display driving circuit 121 may individually light at least a part of the pixel type of the specific color of the pixel units corresponding to the pixel units in the sensing area 101 of the fingerprint sensing circuit 122 on the display panel 110 For example, the red pixel unit is lit individually to provide only red illumination light. The display driving circuit 121 can determine the pixel unit of a specific color pixel type in the sensing area 101 on the display panel 110 according to different fingerprint sensing requirements or device requirements, so as to provide power saving, convenient and flexible operation of these The effect of the pixel unit.

FIG. 3 is a schematic structural diagram of an electronic device in a sensing area according to an embodiment of the invention. Referring to FIGS. 1 to 3, FIG. 3 is an under-screen optical fingerprint sensing architecture. The electronic device 100 includes a display panel 110 and a fingerprint sensor 130. In this embodiment, the electronic device 100 provides a display screen in the first direction P1. The fingerprint sensor 130 is disposed below the sensing area 101 of the display panel 110, and the display panel 110 and the fingerprint sensor 130 have a gap. In this embodiment, the display panel 110 may include a glass panel 111, a cover panel 112, a plurality of pixel units 113-113_M, and a substrate 114. M is a positive integer greater than 1. The glass panel 111, the cover panel 112, the plurality of pixel units 113-113_M, and the substrate 114 are sequentially stacked from top to bottom.

Take a certain pixel unit 113_N as an example, where N is a positive integer greater than 1 and less than or equal to M. When the electronic device 100 performs a fingerprint unlocking operation, the pixel unit 113_N is lit to provide illumination light I1 to the glass panel 111 and the cover panel 112, and at the same time to provide illumination light I2 to the fingerprint sensor 130. When the finger object F touches the glass panel 111, the illumination light I1 will be reflected by the contact surface of the finger object F and the glass panel 111, so that the image light I1' having the fingerprint characteristic information of the finger object F is opposite to the first The fingerprint sensor 130 is injected into the P3 in three directions. However, because the light signal intensity S2 of the illumination light I2 has a stronger light signal intensity S1 than the image light I1' directly under the pixel unit 113_N, the fingerprint sensor 130 obtains the fingerprint at the position directly under the pixel unit 113_N The noise of the image is relatively high. In other words, since the illumination light I2 does not have fingerprint characteristic information, when both the image light I1' and the illumination light I2 enter the fingerprint sensor 130, the illumination light I2 will change in the fingerprint characteristic image generated by the fingerprint sensor 130 It is the background light noise, which affects the fingerprint characteristics displayed by the image light I1'. In this regard, in order to increase the recognizability and accuracy of the fingerprint image captured by the fingerprint sensor 130. In this embodiment, the electronic device 100 will display at least a part of the driven pixel units 113-113_M in the sensing area 101 in the display panel 110 as a display light source pattern, and the light source pattern has a periodically changing pattern to Reduce the influence of illumination light I2.

It is worth noting that the light source pattern described in the above embodiment has multiple ordered patterns or multiple disordered patterns, and the following will further illustrate the examples of several light source patterns proposed in FIGS. 4A to 4C.

4A to 4C are schematic diagrams of examples of multiple light source patterns according to an embodiment of the present invention. Referring to FIG. 1 to FIG. 3 and FIG. 4A, these pixel units 113_1 to 113_M may be composed of red pixels R, green pixels G, and blue pixels B, respectively, but the present invention is not limited thereto. When the pixel units 113_1 to 113_M of the display panel 100 are in an undriven state, and the finger object F contacts the sensing area 101 of the display panel 110 for a fingerprint unlocking operation, the driven of the display panel 110 in the sensing area 101 At least a part of the pixel units 113_1~113_M is to display the light source pattern 111_1 as shown in FIG. 4A. The light source pattern 111_1 may have a plurality of ordered patterns, and these ordered patterns are composed of a plurality of bright area patterns B11 (oblique line areas). In this example, the light source pattern 111_1 may include a plurality of bright area patterns B11 and continuous dark area patterns B21 (non-slanted areas), and these bright area patterns B11 are in a regular manner and periodic in the second direction P2 Arrangement. It should be noted that these bright area patterns B11 refer to that the green pixels G of at least one pixel unit of a plurality of areas corresponding to the display panel 110 are lit (you can also choose to light the red pixels R or the blue pixels B) , And these dark area patterns B21 refer to the green pixels G in the bright area pattern B11 in the display panel 110, and the remaining pixels are not lit (undriven state), or provide lower brightness, but this The invention is not limited to this. In an embodiment, the bright area pattern B11 may also mean that the red pixel R, the green pixel G, and the blue pixel B of at least one pixel unit of the corresponding multiple areas in the display panel 110 are all lit to emit White light. In this regard, the partial image of the fingerprint image captured by the fingerprint sensor 130 corresponding to the dark area pattern B21 can effectively prevent the direct illumination light of the pixel unit from causing the noise ratio to be too high. In other words, part of the fingerprint image captured by the fingerprint sensor 130 may have a lower noise ratio, so that the noise ratio of the entire fingerprint image is too high.

Referring to FIG. 1 to FIG. 3 and FIG. 4B, similarly to the above example of FIG. 4A, when the electronic device 100 performs a fingerprint unlocking operation, the sensing area 101 may display a light source pattern 111_2, wherein the light source pattern 111_2 may have multiple ordered patterns. The ordered patterns are composed of a plurality of bright area patterns B12 (diagonal area) and a plurality of dark area patterns B22 (non-diagonal area). In this example, the light source pattern 111_2 may include a part of a plurality of bright area patterns B12 and a plurality of continuous dark area patterns B22, and these bright area patterns B12 are presented in a specific graphic manner. As shown in FIG. 4B, these bright area patterns B12 may be arranged in a rectangle, and the center is a dark area pattern B22. The patterns of the bright area patterns B12 may be arranged in an array in the first direction P1 and the second direction P2, or arranged in other regular manners or in a periodic manner, but the present invention is not limited thereto. The positions of these bright area patterns B12 can be determined according to the characteristics of the fingerprint sensor 130 or image capturing requirements. In other words, in an embodiment, the positions of the patterns formed by these bright area patterns B12 can also be randomly arranged. It should be noted that these bright area patterns B12 refer to the green pixels G of at least one pixel unit of a plurality of areas corresponding to the display panel 110 being lit (red pixels R or blue pixels B may also be selected to be lit) And these dark area patterns B22 refer to the green pixels G in the bright area pattern B12 in the display panel 110, and the remaining pixels are not lit (undriven state), or provide lower brightness, but this The invention is not limited to this. In an embodiment, the bright area pattern B12 may also mean that the red pixel R, the green pixel G, and the blue pixel B of at least one pixel unit of the corresponding multiple areas in the display panel 110 are all lit to emit White light. In this regard, the partial image of the fingerprint image captured by the fingerprint sensor 130 corresponding to the dark area pattern B22 can effectively prevent the direct illumination light of the pixel unit from causing the noise ratio to be too high. In other words, part of the fingerprint image captured by the fingerprint sensor 130 may have a lower noise ratio, so that the noise ratio of the entire fingerprint image is too high.

Referring to FIGS. 1 to 3 and 4C, and similarly to the example of FIG. 4A described above, when the electronic device 100 performs a fingerprint unlocking operation, the sensing area 101 may display a light source pattern 111_3, where the light source pattern 111_3 may have multiple disordered patterns. These disordered patterns include a plurality of bright area patterns B13 (slanted area). In this example, the light source pattern 111_3 may include these bright area patterns B13 and continuous dark area patterns B23 (non-slanted areas), and these bright area patterns B13 are arranged in an irregular manner. It should be noted that these bright area patterns B13 refer to that the green pixels G of at least one pixel unit of a plurality of areas corresponding to the display panel 110 are lit (you can also choose to light the red pixels R or blue pixels B) , And these dark area patterns B23 refer to the display panel 110 except for the green pixels G in the bright area patterns B13, the remaining pixels are not lit (undriven state), or provide lower brightness, but the present invention Not limited to this. In an embodiment, the bright area pattern B13 may also mean that the red pixel R, the green pixel G, and the blue pixel B of at least one pixel unit of the corresponding multiple areas in the display panel 110 are all lit to emit White light. In this regard, the partial image of the fingerprint image captured by the fingerprint sensor 130 corresponding to the dark area pattern B23 can effectively prevent the direct illumination light of the pixel unit from causing the noise ratio to be too high. In other words, part of the fingerprint image captured by the fingerprint sensor 130 may have a lower noise ratio, so that the noise ratio of the entire fingerprint image is too high.

According to the above examples of FIGS. 4A to 4C, it should be noted that the bright area pattern of the present invention may be one of the red pixel R, the green pixel G and the blue pixel B are lit to emit light of a specific color, Or, the red pixel R, the green pixel G, and the blue pixel B are all lit according to different usage requirements to emit white light. That is to say, the method of forming bright areas by lighting some of the pixels of these pixel units 113_1~113_M in the present invention can actually determine the lighting of specific colors according to different fingerprint recognition requirements A pixel, or all color pixels that are lit in a pixel unit.

However, in an embodiment, when the electronic device 100 performs a fingerprint unlocking operation, the fingerprint sensor 130 is not limited to capturing a fingerprint characteristic image. At least a portion of the pixel units 113_1 to 113_M driven by the display panel 110 in the sensing area 101 may be a plurality of light source patterns that continuously display different periodically changing patterns. For example, the display panel 110 can alternately display the light source pattern 111_1 of FIG. 4A and the light source pattern 111_2 of FIG. 4B in the sensing area 101, and the fingerprint sensor 130 correspondingly captures two fingerprint characteristic images of the finger object F. Due to the different positions of the dark pattern B21 and B22 of the light source pattern 111_1 and the light source pattern 111_2, the corresponding parts of the two fingerprint characteristic images that are clearer are also different (the positions where the noise is lower are different). Therefore, the fingerprint sensing circuit 130 can reorganize the two fingerprint characteristic images. The fingerprint sensing circuit 130 can generate the reconstructed fingerprint feature image by superimposing two distinct parts of the fingerprint feature images (partial images where the noise is relatively low). For this, compared with the above two fingerprint feature images, the overall image of the reorganized fingerprint feature image is clearer and has good recognizable characteristics.

5 is a flowchart of a fingerprint sensing method according to an embodiment of the invention. Referring to FIGS. 1 to 3 and FIG. 5, the fingerprint sensing method of this embodiment can be applied to the electronic device 100 of the embodiments of FIGS. 1 to 3. The electronic device 100 includes a display panel 110, an integrated driving chip 120 and a fingerprint sensor 130, and the integrated driving chip 120 integrates a display driving circuit 121 and a fingerprint sensing circuit 122. In step S510, when the plurality of pixel units 113_1~113_M of the display panel 110 are in an undriven state, and the finger object F contacts the sensing area 101 of the display panel 110 for a fingerprint unlocking operation, the integrated driving chip 120 is integrated The display driving circuit 121 in FIG. drives at least a part of the pixel units 113_1~113_M corresponding to the sensing area 101, so that at least a part of the pixel units 113_1~113_M provides illumination light to the sensing area 101. In step S520, the fingerprint sensor circuit 122 integrated in the integrated driver chip 120 drives the fingerprint sensor 130 to capture the fingerprint characteristic image of the finger object F. Therefore, in the present embodiment, when the electronic device 100 performs a fingerprint unlocking operation, the display driving circuit 121 can individually light up the pixel units 113_1 in the sensing area 101 corresponding to the fingerprint sensing circuit 122 on the display panel 110~ At least a part of 113_M without lighting all the pixel units of the display panel 110. The fingerprint sensing method of this embodiment can provide power saving, convenient and flexible operation of these pixel units.

In addition, regarding other element features, device characteristics, or implementations of the electronic device 100 of this embodiment, reference may be made to the description of the above-described embodiments of FIGS. 1 to 4D to obtain sufficient teaching, suggestions, and implementation descriptions, and thus no further description will be given.

6 is a flowchart of a fingerprint sensing method according to another embodiment of the invention. Referring to FIGS. 1 to 3 and FIG. 6, the fingerprint sensing method of this embodiment can be applied to the electronic device 100 of the embodiments of FIGS. 1 to 3. In addition to the fingerprint sensing methods described in the above embodiments, the electronic device 100 also has a function of automatically monitoring the display panel 110. Specifically, if the display panel 110 is an active matrix organic light-emitting display, the display panel 110 will have a brightness decay as the usage time increases. However, in order to increase the service life of the active matrix organic light-emitting display, the electronic device 100 of this embodiment can monitor the light state image of the display panel 110 captured by the fingerprint sensor 130 for monitoring, and when the display panel 110 is degraded in brightness , The driving voltage or the driving current for driving a part or the entire pixel unit of the display panel 110 can be adjusted in real time. Therefore, the electronic device 100 may perform the following steps S610 to S630.

In step S610, the fingerprint sensing circuit 122 drives the fingerprint sensor 130 to capture the light-emitting state image of the sensing area 111 of the display panel 110. In step S620, the fingerprint sensing circuit 122 analyzes the light-emitting state image, so that the integrated driving chip 120 adjusts the drive voltage or drive current provided by the display drive circuit 121 to the display panel 110 according to the light-emitting state image. Therefore, the display panel 110 can instantly adjust the driving voltage or driving current for driving the display panel 110. Moreover, in step S630, the integrated driving chip 120 can record the adjustment history of the driving voltage or the driving current, and transmit the adjustment history to the external cloud server by wired or wireless communication transmission method. In other words, the electronic device 100 can also synchronously transmit the adjustment history of the driving voltage or the driving current to the external cloud server provided by the manufacturer, so as to effectively feed back the usage performance of the display panel 110 to the manufacturer. Therefore, the manufacturer can perform big data analysis accordingly, and effectively grasp and improve the panel quality of the display panel 110.

In addition, steps S610 to S630 in this embodiment may be performed after step S520 in the embodiment of FIG. 5 described above, for example. In other words, during the process of unlocking the fingerprint, the electronic device 100 can simultaneously monitor whether the display panel 110 has a brightness decay, and immediately compensate and adjust the drive voltage or drive current of the display panel 110. In one embodiment, steps S610 to S630 in this embodiment may also be independent operations, and are not limited to being performed after step S520 in the above-described embodiment of FIG. 5. In addition, regarding other element features, device characteristics, or implementations of the electronic device 100 of this embodiment, reference may be made to the description of the above-described embodiments of FIGS. 1 to 4D to obtain sufficient teaching, suggestions, and implementation descriptions, and thus no further description will be given.

In summary, the electronic device and fingerprint sensing method of the present invention can integrate the display driving circuit and the integrated driving chip of the fingerprint sensing circuit to drive the display panel and the fingerprint sensor, and when fingerprint sensing is performed, it can be immediately A part of the pixel units corresponding to the sensing area of the display panel are driven, and other pixel units outside the sensing area are not driven. Moreover, when performing fingerprint sensing, a plurality of pixel units in the sensing area of the display panel may be partially lit to display at least one bright area pattern or at least one dark area with periodic or non-periodic changes The light source pattern of the pattern, and accordingly provide illumination light to the finger object touching the sensing area of the display panel. Therefore, the electronic device and fingerprint sensing method of the present invention have the effects of low power consumption and fast sensing, and can also produce good fingerprint characteristic images, so that the accuracy of fingerprint recognition can be effectively improved.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

100‧‧‧Electronic device 101‧‧‧ Sensing area 102‧‧‧Non-sensing area 110‧‧‧Display panel 111‧‧‧Glass panel 111_1, 111_2, 111_3‧‧‧Light source pattern 112‧‧‧ Cover panel 113_1 , 113_N, 113_M ‧‧‧ pixel unit 114 ‧ ‧ substrate 120 ‧ ‧ ‧ integrated drive chip 121 ‧ ‧ ‧ display drive circuit 122 ‧ ‧ ‧ fingerprint sensor circuit 130 ‧ ‧ ‧ fingerprint sensor B11, B12, B13 ‧‧‧ Bright area pattern B21, B22, B23 ‧‧‧ Dark area pattern F‧‧‧ Finger object P1, P2, P3 ‧‧‧ Direction I1, I2‧‧‧ Illumination light I1'‧‧‧Image light R‧‧ ‧Red pixel G‧‧‧Green pixel B‧‧‧Blue pixel S1, S2‧‧‧Light signal intensity S510, S520, S610, S620, S630‧‧‧ Step

FIG. 1 is a block diagram of an electronic device according to an embodiment of the invention. 2 is a schematic diagram of an electronic device according to an embodiment of the invention. FIG. 3 is a schematic structural diagram of an electronic device in a sensing area according to an embodiment of the invention. 4A to 4C are schematic diagrams of exemplary light source patterns according to an embodiment of the invention. 5 is a flowchart of a fingerprint sensing method according to an embodiment of the invention. 6 is a flowchart of a fingerprint sensing method according to another embodiment of the invention.

100‧‧‧Electronic device

110‧‧‧Display panel

120‧‧‧ Integrated driver chip

121‧‧‧Display drive circuit

122‧‧‧ Fingerprint sensing circuit

130‧‧‧Fingerprint sensor

Claims (18)

An electronic device includes: a display panel including a plurality of pixel units arranged in an array; a fingerprint sensor disposed under a sensing area of the display panel; and an integrated driving chip coupled to the display panel and The fingerprint sensor integrates a display driving circuit and a fingerprint sensing circuit, wherein the display driving circuit is used to drive the display panel, and the fingerprint sensing circuit is used to drive the fingerprint sensor, wherein when the display The pixel units of the panel are in an undriven state, and a finger object touches the sensing area of the display panel for a fingerprint unlocking operation, the display driving circuit drives the pixel units corresponding to the sensing area At least a portion of the pixel units so that at least a portion of the pixel units provide an illumination light to the sensing area, wherein at least a portion of the pixel units driven by the display panel in the sensing area are continuously displayed with different periods A plurality of light source patterns of sexual change patterns, and the fingerprint sensing circuit drives the fingerprint sensor to capture a plurality of fingerprint feature images of the finger object, wherein the fingerprint sensing circuit reassembles the fingerprint feature images to generate A reorganized fingerprint image. The electronic device as described in item 1 of the patent application range, wherein the sensing area of the display panel is smaller than a display area of the display panel. The electronic device as described in item 1 of the patent application scope, wherein a non-sensing area of the display panel corresponds to another part of the pixel units, and when the hand When the object touches the sensing area of the display panel to perform the fingerprint unlocking operation, another part of the pixel units corresponding to the non-sensing area maintains the undriven state. The electronic device as described in item 1 of the patent application range, wherein the display panel is an active matrix organic light emitting display, and the pixel units include a plurality of color pixel types. The electronic device as described in item 4 of the patent application range, wherein when the finger object touches the sensing area of the display panel to perform the fingerprint unlocking operation, the at least a part of the pixel units driven by the display driving circuit It is at least one of these color pixel types. The electronic device as described in item 1 of the patent application scope, wherein the light source patterns respectively include a plurality of bright area patterns and a plurality of dark area patterns. The electronic device as recited in item 6 of the patent application range, wherein at least one of the bright area patterns and the dark area patterns is periodic in a first direction and at least one in a second direction arrangement. The electronic device as described in item 1 of the patent application range, wherein the fingerprint sensing circuit is further used to drive the fingerprint sensor to capture a light-emitting status image of the sensing area of the display panel, and the fingerprint sensing The test circuit analyzes the light-emitting state image so that the integrated driving chip adjusts a drive voltage or a drive current provided by the display drive circuit to the display panel according to the light-emitting state image. The electronic device as described in item 8 of the patent application range, wherein the integrated driving chip is further used to record an adjustment history of the driving voltage or the driving current, and return the adjustment history to a cloud server. A fingerprint sensing method is suitable for an electronic device, wherein the electronic device includes a display panel, a fingerprint sensor and an integrated driving chip, and the display panel includes a plurality of pixel units arranged in an array, wherein the fingerprint sensor The measuring method includes: when the pixel units of the display panel are in an undriven state, and a finger object touches a sensing area of the display panel to perform a fingerprint unlocking operation, by integrating in the integrated driving chip One of the display driving circuits drives at least a part of the pixel units corresponding to the sensing area, so that at least a part of the pixel units provides an illumination light to the sensing area, wherein the display panel is in the sensing area At least a part of the driven pixel units in FIG. 2 continuously displays a plurality of light source patterns with different periodically changing patterns; the fingerprint sensor is driven by a fingerprint sensing circuit integrated in the integrated driving chip To capture multiple fingerprint feature images of the finger object; and reorganize the fingerprint feature images by the fingerprint sensing circuit to generate a reorganized fingerprint feature image. The fingerprint sensing method as described in item 10 of the patent application range, wherein the sensing area of the display panel is smaller than a display area of the display panel. The fingerprint sensing method as described in item 10 of the patent application range, wherein a non-sensing area of the display panel corresponds to another part of the pixel units, and When the finger object touches the sensing area of the display panel to perform the fingerprint unlocking operation, another part of the pixel units corresponding to the non-sensing area maintains the undriven state. The fingerprint sensing method as described in item 10 of the patent application range, wherein the display panel is an active matrix organic light emitting display, and the pixel units include a plurality of color pixel types. The fingerprint sensing method as described in item 13 of the patent application range, wherein when the finger object touches the sensing area of the display panel to perform the fingerprint unlocking operation, the pixel units driven by the display driving circuit At least a part is at least one of the color pixel types. The fingerprint sensing method as described in item 10 of the patent application range, wherein the light source patterns respectively include a plurality of bright area patterns and a plurality of dark area patterns. The fingerprint sensing method as described in item 15 of the patent application range, wherein at least one of the bright area patterns and the dark area patterns is in a first direction and at least one of a second direction is Arrange periodically. The fingerprint sensing method as described in item 10 of the patent application scope further includes: the fingerprint sensing circuit is further used to drive the fingerprint sensor to capture a light-emitting state of the sensing area of the display panel Image; and analyzing the light-emitting state image by the fingerprint sensing circuit, so that the integrated driving chip adjusts a driving voltage or a driving current provided by the display driving circuit to the display panel according to the light-emitting state image. The fingerprint sensing method described in Item 17 of the patent application scope further includes: The integrated driving chip records an adjustment history of the driving voltage or the driving current, and returns the adjustment history to a cloud server.

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