Patent Publication Number: US-2023154229-A1

Title: Fingerprint sensing device and display device

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates a fingerprint sensing device and a display device, and more particularly to a fingerprint sensing device and a display device capable of detecting at least two fingerprint at the same time. 
     2. Description of the Prior Art 
     With development of advanced technology, fingerprint recognition has become a commonly used biometric recognition method, which uses a fingerprint sensing device to detect a user&#39;s fingerprint to identify the user&#39;s identity. However, most conventional fingerprint sensing devices can only detect a single fingerprint at a time and cannot recognize multiple fingerprints at a time; or although they may have multiple fingerprint recognition functions, misjudgment or unstable recognition still easily occur in these devices. 
     SUMMARY OF THE INVENTION 
     An embodiment of the present invention provides a fingerprint sensing device. The fingerprint sensing device includes a substrate and a plurality of fingerprint sensing elements. The fingerprint sensing elements are disposed on the substrate and electrically insulated from each other. Each of the fingerprint sensing elements includes a plurality of sensors, and a width of one of the fingerprint sensing elements in a direction ranges from 5 mm to 20 mm. 
     Another embodiment of the present invention provides a display device having a display region and including a fingerprint sensing device. The fingerprint sensing device includes a substrate and a plurality of fingerprint sensing elements disposed on the substrate in the display region and electrically insulated from each other. Each of the fingerprint sensing elements includes a plurality of sensors, and a width of one of the fingerprint sensing elements in a direction ranges from 5 mm to 20 mm. 
     These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    schematically illustrates a fingerprint sensing device performing multiple fingerprint detection according to a first embodiment of the present invention. 
         FIG.  2    schematically illustrates a top view of a fingerprint sensing device according to a second embodiment of the present invention. 
         FIG.  3    schematically illustrates a top view of the fingerprint sensing device performing multiple fingerprint detection according to the second embodiment of the present invention. 
         FIG.  4    schematically illustrates a top view of the fingerprint sensing device performing detection to the fingerprints with larger position changes according to the second embodiment of the present invention. 
         FIG.  5    schematically illustrates a top view of the fingerprint sensing element according to the second embodiment of the present invention. 
         FIG.  6    schematically illustrates a top view of a fingerprint sensing element according to a variant embodiment of the second embodiment of the present invention. 
         FIG.  7    schematically illustrates a top view of a fingerprint sensing device according to a third embodiment of the present invention. 
         FIG.  8    schematically illustrates a top view of a fingerprint sensing device according to a fourth embodiment of the present invention. 
         FIG.  9    schematically illustrates a cross-sectional view of a display device according to an embodiment of the present invention. 
         FIG.  10    schematically illustrates a top view of a display device according to another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     The contents of the present invention will be described in detail with reference to specific embodiments and drawings. It is noted that, for purposes of illustrative clarity and being easily understood by the readers, the following drawings may be simplified schematic diagrams, and elements therein may not be drawn to scale. The numbers and dimensions of the elements in the drawings are just illustrative and are not intended to limit the scope of the present invention. 
     Refer to  FIG.  1   , which schematically illustrates a fingerprint sensing device performing detection to multiple fingerprints according to a first embodiment of the present invention. As shown in  FIG.  1   , in the fingerprint sensing device  1   a  of this embodiment, a fingerprint sensing element  1   b  may be disposed on a substrate  1   c . When the fingerprint sensing device  1   a  detects multiple fingerprints, multiple fingers F 1  and F 2  are disposed on the same fingerprint sensing element  1   b  of the fingerprint sensing device  1   a , and the fingerprint sensing element  1   b  detects the fingerprints of the fingers F 1  and F 2  by scanning row by row, that is, the fingerprint sensing element  1   b  may detect the fingerprints sequentially along multiple line segments L 1 , such that a signal code combination corresponding to an entire fingerprint of the finger F 1  and the finger F 2  may be obtained after the fingerprint sensing element  1   b  scans from a first side S 1  to a second side S 2  along a column direction of sensors. In  FIG.  1   , the line segment L 1  is as an example for representing a signal code arrangement detected from the fingerprints of the fingers F 1  and F 2  in the same row, but not limited thereto. When the fingerprint sensing element  1   b  detects the fingerprints of the fingers F 1  and F 2  along the line segment L 1  (i.e., by using sensors in the same row), the signal code arrangement of ridge signals and valley signals detected from the fingerprints of the finger F 1  and the finger F 2  on the line segment L 1  may be obtained at the same time, in which the ridge signal is represented by “1”, and the valley signal is represented by “0”. Through the relative positions and the signal codes of ridges and valleys, the signal code arrangement of the fingerprints of the finger F 1  and the finger F 2  on the line segment L 1  may be obtained. Since the signal codes on the same line segment L 1  are separated by the same interval, the local signal code arrangement may be 01000100, for example, as shown in an enlarged view of a region R 1  in  FIG.  1   . 
     However, in the fingerprint sensing device  1   a  of  FIG.  1   , the user cannot ensure that a relative position between the finger F 1  and the finger F 2 , a pressing pattern of the finger F 1  and/or a pressing pattern of the finger F 2  maintain the same every time the user presses, such that the relative position between the finger F 1  and the finger F 2 , the pressing pattern of the finger F 1  and/or the pressing pattern of the finger F 2  are easily changed. As shown in  FIG.  1   , as the relative position between the finger F 1  and the finger F 2  changes, for example, the finger F 2  moves to the position of the finger F 2 ′ at the next time touching, a distance between the fingerprint of the finger F 2 ′ and the fingerprint of the finger F 1  will change, so that the signal code combination of the ridge signals and the valley signals detected by the fingerprint sensing element  1   a  will change. Accordingly, the signal coding combination detected this time is different from the signal coding combination detected last time. When the signal code combination alters, the control element of the fingerprint sensing device  1   a  cannot accurately recognize whether the signal code combination is detected from fingerprints of different fingers of the same person. In other words, the fingerprints of different fingers F 1  and F 2  may interfere with each other during detection, resulting in misjudgment, which makes the fingerprint sensing device  1   a  of  FIG.  1    difficult to accurately detect multiple fingerprints at a time. Therefore, the fingerprint sensing device  1   a  needs extra algorithm to further distinguish the fingerprint of the finger F 1  from the fingerprint of the finger F 2 , but this method will increase load of control element, reduce detection accuracy, and decrease recognition efficiency. 
       FIG.  2    schematically illustrates a top view of a fingerprint sensing device according to a second embodiment of the present invention. As shown in  FIG.  2   , the fingerprint sensing device  10  may include a substrate  12  and a plurality of fingerprint sensing elements  14  disposed on the substrate  12 . The substrate  12  may include, for example, a flexible or rigid transparent substrate, such as glass, quartz, sapphire, plastic, or other suitable substrates. The fingerprint sensing elements  14  are controlled independently of each other to detect the fingerprints of the fingers respectively, so that the fingerprint detections of adjacent fingerprint sensing elements  14  do not interfere with each other. For example, the fingerprint sensing elements  14  may be electrically insulated from each other. Specifically, the fingerprint sensing device  10  may have a fingerprint sensing region  10   a , and the fingerprint sensing elements  14  are disposed in the fingerprint sensing region  10   a . Moreover, in the fingerprint sensing region  10   a , any two adjacent fingerprint sensing elements  14  are not electrically connected to each other (i.e., electrically insulated from each other). In other words, in the fingerprint sensing region  10   a , any two adjacent fingerprint sensing elements  14  may not be directly electrically connected to each other through conductive lines. In some embodiments, as the fingerprint sensing device  10  is applied to a display device  100 , the fingerprint sensing region  10   a  may be the same as or like a display region (e.g., the display region DR shown in  FIG.  9    or  FIG.  10   ) of the display device  100 . 
     As shown in  FIG.  2   , each fingerprint sensing element  14  may include a plurality of sensors  16  for detecting patterns of different parts of the fingerprint. The sensors  16  of different fingerprint sensing elements  14  may be electrically insulated from each other. The sensor  16  may include, for example, a light sensor or other kinds of sensors. The light sensor may include, for example, a photosensitive transistor (the sensor  16  as shown in  FIG.  5   ), a photodiode, or other suitable photoelectric conversion elements, where the photosensitive transistor may be, for example, a thin film transistor or other types of transistors. In the embodiment of  FIG.  2   , the sensors  16  of one of the fingerprint sensing elements  14  may be arranged in an array or other suitable arrangements to detect fingerprint images. The number and distribution density of the sensors  16  in one of the fingerprint sensing elements  14  are not limited to those shown in  FIG.  2    and may be determined according to requirements or resolution that fingerprint images may be recognized. In some embodiments, the fingerprint sensing element  14  may be, for example, a capacitive fingerprint sensing element. In this case, a sensing unit of the fingerprint sensing element  14  (e.g., the sensing unit  112  shown in  FIG.  6   ) may be used as the sensor  16  of  FIG.  2   . 
     As shown in  FIG.  2   , it should be noted that a width W 1  of the fingerprint sensing element  14  in a first direction D 1  may be, for example, substantially the same as a width of one finger of the user. In some embodiments, a width W 2  of the fingerprint sensing element  14  in a second direction D 2  may also be, for example, substantially the same as the width of one finger of the user. In an embodiment, the width W 1  and/or the width W 2  of the fingerprint sensing element  14  may be, for example, a distance between the outer sides of two outermost sensors  16  of the fingerprint sensing element  14  arranged in the first direction D 1  or the second direction D 2 , but not limited thereto. For example, the width W 1  and/or the width W 2  may, for example, range from 5 mm to 20 mm, but not limited thereto. In addition, a distance G 1  between two adjacent fingerprint sensing elements  14  arranged in the first direction D 1  and/or a distance G 2  between two adjacent fingerprint sensing elements  14  arranged in the second direction D 2  may be, for example, greater than 2 mm and/or less than or equal to 5 mm, so that it is not easy for two fingers to press on the same fingerprint sensing element  14  at the same time. In an embodiment, each of the distance G 1  and the distance G 2  may refer to a distance between two closest sensors  16  of two adjacent fingerprint sensing elements  14 , but not limited thereto. 
     As shown in  FIG.  2   , the fingerprint sensing device  10  may further include a plurality of control elements  18  and a plurality of connecting line groups  110 , which are disposed on the substrate  12 , and at least two fingerprint sensing elements  14  may be electrically connected to at least two control elements  18 , respectively. The control element  18  may include, for example, a driver chip or other suitable chip for independently driving or controlling the corresponding fingerprint sensing element  14  to perform fingerprint detection; i.e., the fingerprint sensing elements  14  may be independently driven to detect rather than being controlled by connecting them to each other in series. In the embodiment of  FIG.  2   , each control element  18  may be electrically connected to the corresponding fingerprint sensing element  14  in a one-to-one manner through the corresponding connecting line group  110 , but not limited thereto.  FIG.  2    only shows the control element  18  is electrically connected to the corresponding fingerprint sensing element  14  by a single connecting line group  110  as an example, but not limited thereto. In some embodiments, one of the fingerprint sensing elements  14  may be electrically connected to the corresponding control element  18  through a plurality of connecting line groups  110 . Although not shown in  FIG.  2   , each connecting line group  110  may be composed of a plurality of lines for electrically connecting the sensors  16  of the corresponding fingerprint sensing element  14  to the corresponding control element  18 , respectively. In addition, in the fingerprint sensing region  10   a  of the fingerprint sensing device  10 , adjacent connecting line groups  110  may not be electrically connected to each other. In some embodiments, the number of lines of one of the connecting line groups  110  may be less than the number of sensors  16  of the corresponding fingerprint sensing element  14  electrically connected to this connecting line group  110 , but not limited thereto. In some embodiments, the number of the control elements  18  may be different from the number of the fingerprint sensing elements  14 . For example, the number of the fingerprint sensing elements  14  may be greater than the number of the control elements  18 ; for example, multiple fingerprint sensing elements  14  may be electrically connected to and controlled by the same control element  18 . In the embodiment of  FIG.  2   , a part of the connecting line groups  110  may be disposed between adjacent fingerprint sensing elements  14 , but not limited thereto. In some embodiments, at least one connecting line group  110  may be disposed between adjacent fingerprint sensing elements  14 . For example, the connecting line group  110   a , the fingerprint sensing element  14   a , the fingerprint sensing element  14   b , and the fingerprint sensing element  14   c  may be disposed in the display region (the display region DR shown in  FIG.  9    or  FIG.  10   ), and the connecting line group  110   a  may be disposed between the fingerprint sensing element  14   a  and the fingerprint sensing element  14   b . In this case, the connecting line group  110   a  may be electrically connected to the fingerprint sensing element  14   c  and electrically insulated from the fingerprint sensing element  14   a  and the fingerprint sensing element  14   b . In some embodiments, when the fingerprint sensing device  10  is applied to a display panel (such as the display panel  50  shown in  FIG.  9    or  FIG.  10   ), the control element  18  may be disposed in the non-display region of the display panel, and the sensors  16  may be disposed in the display region (the display region DR shown in  FIG.  9    or  FIG.  10   ) of the display panel. 
       FIG.  3    schematically illustrates a top view of the fingerprint sensing device performing multiple fingerprint detection according to the second embodiment of the present invention. In  FIG.  3   , the fingerprint sensing device  10  performs detection to the fingerprints of two fingers F 1  and F 2  as an example, but not limited thereto. Since the width W 1  of the fingerprint sensing element  14  in the first direction D 1  and/or the width W 2  of the fingerprint sensing element  14  in the second direction D 2  may be substantially the width of a user&#39;s finger, when the finger F 1  and the finger F 2  are put on the fingerprint sensing device  10 , the finger F 1  and the finger F 2  may be respectively located on different fingerprint sensing elements  141 ,  142 , such that fingerprint patterns of the finger F 1  and the finger F 2  may be detected by the different fingerprint sensing elements  141 ,  142  respectively. In such case, interference resulted from the different relative positions between the finger F 1  and the finger F 2  when they touch the fingerprint sensing device  10  multiple times and are detected by the same fingerprint sensing element  14  may be avoided. For example, when the finger F 1  and the finger F 2  are put on the fingerprint sensing device  10  for the first time, the fingerprint sensing element  141  corresponding to the finger F 1  may detect a signal code combination corresponding to the finger F 1 . For example, the sensors of the same row corresponding to the line segment L 2  (e.g., the sensors  16  in the same row as shown in  FIG.  2   ) may detect the ridge signals and the valley signals of the corresponding finger F 1  to obtain a signal code arrangement, and then, by scanning the sensors of different rows, an entire signal code combination corresponding to the fingerprint pattern of the finger F 1  may be obtained. The fingerprint sensing element  142  corresponding to the finger F 2  may detect another signal code combination corresponding to the finger F 2 . For example, the sensors of the same row corresponding to a line segment L 3  may detect the ridge signals and the valley signals of the corresponding finger F 2  to obtain another signal code arrangement, such as the signal code arrangement C 1  shown in an enlarged view of the region R 2  in  FIG.  3   , where the ridge signal may be represented by “1” and the valley signal may be represented by “0”. The entire signal code combination corresponding to the fingerprint pattern of the finger F 2  may be obtained by scanning sensors of different rows of the fingerprint sensing element  142 . When the fingers F 1  and F 2  are put on the fingerprint sensing device  10  again, a position of the finger F 1  may not change, and the finger F 2  may move to the position of the finger F 2 ′, for example. In this case, the fingerprint sensing element  141  may still detect a fingerprint pattern corresponding to the same signal code combination. For example, the sensors corresponding to the line segment L 2  may detect the same signal code arrangement of the ridge signals and the valley signals. Since the position of the finger F 2 ′ is different from the position of the finger F 2 , the sensors of the same row corresponding to the line segment L 3  of the fingerprint sensing element  142  may not detect the same signal code arrangement, but the fingerprint sensing element  142  may still detect a signal code combination this time, at least a part of which is the same as at least apart of the signal code combination corresponding to the finger F 2  detected last time. For example, since the fingerprint sensing element  142  and the fingerprint sensing element  141  are controlled independently of each other, the fingerprint sensing element  142  may detect the signal code arrangement (such as the signal code arrangement C 2  shown in an enlarged view of the region R 3  in  FIG.  3   ) of the ridge signals and the valley signals of the finger F 2 ′ through the sensors of the same row corresponding to the line segment L 4 . Since the signal code arrangement C 2  is the same as the signal code arrangement C 1 , the fingerprint sensing device  10  may recognize that the finger F 2 ′ may be the same as the finger F 2  through the signal code arrangement C 1  and the signal code arrangement C 2 , for example. In other words, the fingerprint sensing device  10  may detect multiple fingerprints at the same time without being affected by changes in the relative positions between the finger F 1  and the finger F 2 , thereby achieving multi-fingerprint recognition at the same time. In addition, since a distance between two adjacent fingerprint sensing elements  14  may be greater than 2 mm, it is possible to reduce or prevent two fingers F 1  and F 2  or two fingers F 1  and F 2 ′ from pressing on the same fingerprint sensing element  14  at the same time. Accordingly, misjudgment may be avoided, the detection accuracy may be improved, and the recognition efficiency may be reduced. In some embodiments, since the fingerprint patterns of the finger F 1  and the finger F 2 ′ may be detected by different fingerprint sensing elements  141  and  142 , respectively, even if the pressing pattern of at least one of the finger F 1  and the finger F 2 ′ changes, the control element  18  in the fingerprint sensing device  10  may still separately recognize whether the pressing pattern of the finger F 1  and the pressing pattern of the finger F 2 ′ are correct, thereby improving the detection accuracy. 
       FIG.  4    schematically illustrates a top view of the fingerprint sensing device performing detection to the fingerprints with larger changes in relative position according to the second embodiment of the present invention. As shown in  FIG.  4   , the fingerprint sensing element  142  may detect the signal code combination of the finger F 2 . Although the position of the finger F 2 ′ is farther from the position of original finger F 2 , the signal code combination detected by another fingerprint sensing element  143  from the region R 5  may still be the same as a part of the signal code combination corresponding to the region R 4  detected by the fingerprint sensing element  142 . Alternatively, other fingerprint sensing elements (such as the fingerprint sensing element  142 , the fingerprint sensing element  144 , and/or the fingerprint sensing element  145 ) may respectively detect the signal code combinations corresponding to fingerprint patterns of the other parts of the finger F 2 ′, and by integrating the detected signal code combinations, it may be recognized whether the finger F 2 ′ is the same as the finger F 2 . Therefore, no matter how much the relative positions between multiple fingers change, the finger F 1  and the finger F 2  or the finger F 1  and the finger F 2 ′ may be prevented from pressing on the same fingerprint sensing element  14  by multiple fingerprint sensing elements  14  controlled independently of each other, thereby improving the detection accuracy. In some embodiments, a pattern size corresponding to the signal code combination detected from the region R 5  of the fingerprint sensing element  143  may be, for example, substantially greater than or equal to 25% of the fingerprint pattern of a single finger, so that the signal code combination detected from the region R 5  may have enough fingerprint data for recognition. 
       FIG.  5    schematically illustrates a top view of the fingerprint sensing element according to the second embodiment of the present invention. As shown in  FIG.  5   , the fingerprint sensing element  14  of this embodiment may include a plurality of sensing units  112 , and each sensing unit  112  may include one sensor  16  and a switch transistor  114 , but not limited thereto. The sensing unit  112  may be arranged in an array or other suitable arrangement to detect fingerprint images. In the embodiment of  FIG.  5   , the sensor  16  is a photosensitive transistor as an example, but not limited thereto. A gate G of the sensor  16  may be electrically connected to a source S of the sensor  16 , and a drain D of the sensor  16  may be electrically connected to a source S of the switch transistor  114 . The switch transistor  114  may be, for example, a bottom-gate type, a top-gate type, or other types of transistors, and the sensor  16  may be, for example, a bottom-gate type, a top-gate type, a deviated-gate type, or other types of transistors. The sensor  16  in  FIG.  5    is the deviated-gate type transistor as an example, but not limited thereto. The semiconductor layers of photosensitive transistor of the sensor  16  and the switch transistor  114  may include, for example, amorphous silicon, polysilicon, oxide semiconductor, or other suitable semiconductor materials. The sensor  16  of the present invention is not limited to the photosensitive transistor. In some embodiments, the photosensitive transistor may be replaced with a photodiode or other suitable photoelectric conversion elements. 
     As shown in  FIG.  5   , in addition to the sensing unit  112 , the fingerprint sensing element  14  may further include, for example, a plurality of scan lines GL, a plurality of sensing lines SL, and a plurality of bias lines BL, which are disposed on the substrate  12 , but not limited thereto. In each sensing unit  112 , the source S of the photosensitive transistor may be electrically connected to the corresponding bias line BL, and a gate G and a drain D of the switch transistor  114  may be electrically connected to the corresponding scan line GL and the corresponding sensing line SL, respectively, but not limited thereto. The scan lines GL, the sensing lines SL and the bias lines BL may be electrically connected to the corresponding control element  18  through different lines, for example. It should be noted that circuit configuration of the fingerprint sensing element  14  of the present invention is not limited to that shown in  FIG.  5    and may further include other suitable elements. The sensor  16  is not limited to that shown in  FIG.  5    and may be adjusted according to requirements. 
       FIG.  6    schematically illustrates a top view of a fingerprint sensing element according to a variant embodiment of the second embodiment of the present invention. As shown in  FIG.  6   , each fingerprint sensing element  14  of this variant embodiment may be a capacitive fingerprint sensing element and may include a plurality of sensing units  112 . Different fingerprint sensing elements  14  are still electrically insulated from each other and are respectively electrically connected to the corresponding control elements  18  through the connecting line groups  110 . 
     In the variant embodiment of  FIG.  6   , each fingerprint sensing element  14  may include a plurality of first sensing pads  116 , a plurality of first bridge structures  118 , a plurality of second sensing pads  120 , a plurality of second bridge structures  122 , and a plurality of insulating blocks  124 . The first sensing pads  116  and the first bridge structures  118  arranged in the first direction D 1  may be connected to form a plurality of first sensing strings  126  extending along the first direction D 1 , and the second sensing pads  120  and the second bridging structure  122  arranged in the second direction D 2  may be connected to form a plurality of second sensing strings  128  extending along the second direction D 2 . The first bridge structure  118  may cross the corresponding second bridge structure  122  in the top view direction V, such that the first sensing strings  126  may cross the second sensing strings  128  in the top view direction V. The insulating blocks  124  may be disposed between the first bridge structure  118  and the corresponding second bridge structure  122  to electrically insulate the first sensing strings  126  and the second sensing strings  128 . In some embodiments, the insulating blocks  124  may be connected to each other to form a single insulating layer, and the second bridge structure  122  may be electrically connected to the corresponding second sensing pads  120  through openings of the insulating layer, but not limited thereto. Those skilled in the art should understand that layers for forming the first sensing pads  116 , the first bridge structures  118 , the second sensing pads  120 , and the second bridge structures  122  may be adjusted based on requirements and will not be detailed. In this variant embodiment, one of the sensing units  112  may be formed at an intersection of one of the first sensing strings  126  and one of the second sensing strings  128 . For example, portions of two adjacent first sensing pads  116 , one of the first bridge structures  118  disposed between the two adjacent first sensing pads  116 , portions of two adjacent second sensing pads  120 , and one of the second bridge structures  122  disposed between the two adjacent second sensing pads  120  may form one of the sensing units  112 , but not limited thereto. It should be noted that the sensing unit  112  of this variant embodiment may not need additional switch transistors  114  and may be directly used as the sensor  16  shown in  FIG.  2   . The number of the first sensing pads  116 , the first bridge structures  118 , the second sensing pads  120 , and the second bridge structures  122  in a single fingerprint sensing element  14  is not limited to that shown in  FIG.  6    and may be changed according to requirements or resolution for recognition. In some embodiments, the first sensing strings  126  and the second sensing strings  128  may be stripe-shaped, but not limited thereto. 
       FIG.  7    schematically illustrates a top view of a fingerprint sensing device according to a third embodiment of the present invention. As shown in  FIG.  7   , the fingerprint sensing device  20  of this embodiment differs from the fingerprint sensing device  10  of  FIG.  2    in that the fingerprint sensing elements  14  of this embodiment are electrically connected to the same control element  18  respectively, and the control element  18  independently control the fingerprint sensing elements  14 , such that the fingerprint sensing elements  14  do not affect each other. The fingerprint sensing element  14  of this embodiment may use the fingerprint sensing element of any of the above-mentioned embodiments or their variant embodiment. 
       FIG.  8    schematically illustrates a top view of a fingerprint sensing device according to a fourth embodiment of the present invention. As shown in  FIG.  8   , the fingerprint sensing device  30  of this embodiment differs from the fingerprint sensing device  10  of  FIG.  2    in that at least a part of the control elements  18  of this embodiment may be disposed between adjacent fingerprint sensing elements  14 . For example, when the fingerprint sensing device  30  is disposed on the display panel, the control elements  18  may be disposed corresponding to the black matrix in the display region of the display panel, but not limited thereto. The fingerprint sensing element  14  of this embodiment may use the fingerprint sensing element of any of the above-mentioned embodiments or their variant embodiment. 
       FIG.  9    schematically illustrates a cross-sectional view of a display device according to an embodiment of the present invention. As shown in  FIG.  9   , the fingerprint sensing device  40  may be applied to the display device  100 . Specifically, the display device  100  may have a display region DR, and a plurality of fingerprint sensing elements of the fingerprint sensing device  40  may be disposed in the display region DR to detect fingerprint of the finger F. The fingerprint sensing device  40  of this embodiment may adopt the fingerprint sensing device of any of the above-mentioned embodiments and will not be redundantly described. The display device  100  may further include a display panel  50 , and the fingerprint sensing device  40  may be disposed under the display panel  50 . In some embodiments, the fingerprint sensing device  40  may be disposed on a display surface DS 1  of the display panel  50 , but not limited thereto. The display panel  50  of  FIG.  9    is an organic light-emitting diode (organic light-emitting diode) display panel as an example, but not limited thereto. In some embodiments, the display panel  50  may include, for example, a micro light-emitting diode (micro light-emitting diode) display panel, a liquid crystal display panel, or other suitable display panels. In some embodiments, the control element (such as the control element  18  shown in  FIG.  2   ,  FIG.  6   , or  FIG.  7   ) of the fingerprint sensing device  40  may be disposed in a peripheral region outside the display region DR of the display device  100 . Alternatively, when the control element  18  (such as the control element  18  shown in  FIG.  8   ) is disposed between adjacent fingerprint sensing elements  14 , the control element  18  may be disposed in the display region DR of the display device  100 . 
       FIG.  10    schematically illustrates a top view of a display device according to another embodiment of the present invention. As shown in  FIG.  10   , the display device  200  of this embodiment differs from the display device  100  of  FIG.  9    in that the fingerprint sensing device  40  of this embodiment may be embedded and disposed in the display panel  50 . The fingerprint sensing device  40  of  FIG.  10    only displays one fingerprint sensing element  14 , but the fingerprint sensing device  40  may still include a plurality of fingerprint sensing elements  14 , as shown in  FIG.  2   ,  FIG.  6   ,  FIG.  7   , or  FIG.  8   . The fingerprint sensing device  40  of this embodiment may adopt the fingerprint sensing device of any of the above-mentioned embodiments and will not be redundantly described. As shown in  FIG.  10   , the display panel  50  may include a plurality of display pixel units  52 , a plurality of data lines DL, a plurality of scan lines GL, a plurality of sensing lines SL, and a plurality of bias lines BL, which are disposed on the substrate  12 . The fingerprint sensing elements  14  may be disposed on the same substrate  12 . In the embodiment of  FIG.  10   , each display pixel unit  52  may respectively correspond to one sensing unit  112 , but not limited thereto. In some embodiments, multiple display pixel units  52  may correspond to one sensing unit  112 , or one display pixel unit  52  may correspond to multiple sensing units  112 . Each display pixel unit  52  may include a switch transistor  521  and a pixel electrode  522 , and a gate, a source, and a drain of the switch transistor  521  may be electrically connected to the corresponding scan line GL, data line DL, and pixel electrode  522 , respectively. In one embodiment, if the display panel  50  is a liquid crystal display, the pixel electrode  522  may be used to drive liquid crystal. As shown in  FIG.  10   , by the data signals of the data lines DL and the scan signals of the scan lines GL, the light intensity of the display pixel units  52  may be controlled to display images. Since structure of the sensing units  112  and electrical connections of the sensing units  112  with the corresponding scan lines GL, the sensing lines SL, and the bias lines BL may be, for example, the same as the structure and electrical connection shown in  FIG.  5    and will not be repeated herein. In some embodiments, light generated by the display pixel units  52  may be used as a light source for detecting fingerprints, but not limited thereto. In addition, in other embodiments, the display panel  50  may be an organic light emitting diode display panel. 
     In summary, in the fingerprint sensing device of the present invention, since a plurality of fingerprint sensing elements controlled independently with sizes close to the size of the finger are provided, when multiple fingers touch the fingerprint sensing device, the issue that two fingers are disposed on the same fingerprint sensing element at the same time may be mitigated, such that multiple fingerprints may be detected at the same time by different fingerprint sensing elements. Therefore, the detection of multiple fingerprints at the same time will not be affected by the changes in relative positions between the fingers, thereby avoiding misjudgment. 
     Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.