Patent Publication Number: US-11651617-B2

Title: Display device and electronic device including integrated light emitting units and sensor units

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This patent application is a continuation application and claims priority of U.S. patent application Ser. No. 16/921,972, field on Jul. 7, 2020, and the entire contents of which are incorporated herein by reference. 
    
    
     BACKGROUND OF THE DISCLOSURE 
     1. Field of the Disclosure 
     The present disclosure is related to a display device and an electronic device including sensors, and more particularly, to a display device and an electronic device including fingerprint sensors. 
     2. Description of the Prior Art 
     In general, fingerprint identification can be used to identify personal identity. Fingerprint identification has been integrated into electronic devices and widely used with the development of the technology of electronic device. Users can directly access the electronic device through the fingerprint identification without memorizing passwords. Moreover, fingerprint identification can provide better convenience or security since the process of fingerprint identification is fast and the fingerprint is difficult to counterfeit. In recent years, the industry is committed to integrating the fingerprint sensing function and the display function into the electronic device that can display high-resolution images. The sensing technology can not only be applied to fingerprint identification, but also has applications such as image sensing or touch sensing. 
     SUMMARY OF THE DISCLOSURE 
     To solve the above technical problem, one of the objectives of the present disclosure is to provide a display device including a substrate, a first pixel circuitry, a first light emitting unit, a fingerprint sensor circuitry, and a fingerprint sensor unit. The first pixel circuitry and the first light emitting unit are disposed on the substrate, and the first light emitting unit is driven by the first pixel circuitry. The fingerprint sensor circuitry and the fingerprint sensor unit are disposed on the substrate, and the fingerprint sensor unit is driven by the fingerprint sensor circuitry. The first pixel circuitry and the fingerprint sensor circuitry are disposed on different planes. 
     To solve the above technical problem, one of the objectives of the present disclosure is to provide a display device including a substrate, a pixel circuitry, a first light emitting unit, a fingerprint sensor circuitry, and a fingerprint sensor unit. The pixel circuitry and the first light emitting unit are disposed on the substrate, and the first light emitting unit is driven by the pixel circuitry. The fingerprint sensor circuitry and the fingerprint sensor unit are disposed on the substrate, and the fingerprint sensor unit is driven by the fingerprint sensor circuitry. The first light emitting unit overlaps with at least a portion of the fingerprint sensor circuitry in a top view direction of the display device. 
     The present disclosure also provides an electronic device including a display device. The display device includes a substrate, a first pixel circuitry, a first light emitting unit, a sensor circuitry, and a sensor unit. The first pixel circuitry and the first light emitting unit are disposed on the substrate, and the first light emitting unit is driven by the first pixel circuitry. The sensor circuitry and the sensor unit are disposed on the substrate, and the sensor unit is driven by the sensor circuitry. The first light emitting unit overlaps with at least a portion of the sensor circuitry in a top view direction of the display device. 
     These and other objectives of the present disclosure will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the embodiment that is illustrated in the various figures and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic diagram illustrating a display device according to a first embodiment of the present disclosure. 
         FIG.  2    is a circuit diagram of the display device in  FIG.  1   . 
         FIG.  3    is a cross-sectional schematic diagram illustrating a structure taken along the line A-A′ of  FIG.  1   . 
         FIG.  4    is a schematic diagram illustrating a display device according to a second embodiment of the present disclosure. 
         FIG.  5    is a schematic diagram illustrating a display device according to a third embodiment of the present disclosure. 
         FIG.  6    is a schematic diagram illustrating a display device according to a fourth embodiment of the present disclosure. 
         FIG.  7    is a schematic diagram illustrating a display device according to a fifth embodiment of the present disclosure. 
         FIG.  8    is a schematic diagram illustrating a display device according to a sixth embodiment of the present disclosure. 
         FIG.  9    is a cross-sectional schematic diagram illustrating a structure taken along the line B-B′ of  FIG.  8   . 
         FIG.  10    is a schematic diagram illustrating a display device according to a seventh embodiment of the present disclosure. 
         FIG.  11    is a schematic diagram illustrating a display device according to an eighth embodiment of the present disclosure. 
         FIG.  12    is a schematic diagram illustrating a display device according to a ninth embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure may be understood by reference to the following detailed description, taken in conjunction with the drawings as described below. It is noted that, for purposes of illustrative clarity and being easily understood by the readers, various drawings of this disclosure show a portion of an electronic device or a tiled device, and certain elements in various drawings may not be drawn to scale. In addition, the number and dimension of each device shown in drawings are only illustrative and are not intended to limit the scope of the present disclosure. 
     Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will understand, electronic equipment manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms “include”, “comprise” and “have” are used in an open-ended fashion, and thus should be interpreted to mean “include, but not limited to . . . ”. 
     It will be understood that when an element or layer is referred to as being “on” or “connected to” another element or layer, it can be directly on or directly connected to the other element or layer, or intervening elements or layers may be presented. In contrast, when an element is referred to as being “directly on” or “directly connected to” another element or layer, there are no intervening elements or layers presented. 
     The electrical connection may include direct connection or indirect connection. The electrical connection between two components can be achieved by directly contacting in order to transmit electrical signals, and there are no other components between the two components. The electrical connection of two components can also be bridged through the component intermediary between the two components to transmit electrical signals. Electrical connection can also be called as coupling. 
     The term “about”, “substantially”, “equal”, or “same” generally refers to falling within 20% of a given value or range, or to falling within 10%, 5%, 3%, 2%, 1%, or 0.5% of a given value or range. 
     Although terms such as first, second, third, etc., may be used to describe diverse constituent elements, such constituent elements are not limited by the terms. The terms are used only to discriminate a constituent element from other constituent elements in the specification. The claims may not use the same terms, but instead may use the terms first, second, third, etc. with respect to the order in which an element is claimed. Accordingly, in the following description, a first constituent element may be a second constituent element in a claim. 
     It should be noted that the technical features in different embodiments described in the following can be replaced, recombined, or mixed with one another to constitute another embodiment without departing from the spirit of the present disclosure. 
     An electronic device of the present disclosure may include a display device, an antenna device, or a tiled device, but not limited thereto. The electronic device may be a bendable or flexible electronic device. The electronic device may be a display device having a touch function, an image sensing function, various types of parameter sensing functions, or a fingerprint identification function. The display device may be a self-luminous display, such as organic light emitting diode (OLED) display, inorganic light emitting diode display (LED), mini light emitting diode (mini LED, millimeter sized LED) display, micro light emitting diode (micro-LED, micrometer sized LED) display, quantum dot (QD) material display (including, for example, quantum dot light emitting diode (QLED, QDLED)), fluorescence material display, phosphor material display, or other suitable displays, or any combination of the above displays, but not limited thereto. The concept or principle of the present disclosure can also be applied to a non-self-luminous liquid crystal display (LCD), but not limited thereto. The embodiments of the present disclosure take an electronic device including a self-luminous light emitting diode display as an example, but not limited thereto. 
     The antenna device may include, for example, a liquid crystal antenna or other types of antennas, but not limited thereto. The tiled device may be, for example but not limited to, a display tiled device, an antenna tiled device, or a combination thereof. It should be noted that the electronic device can be any combination of the above devices, but not limited thereto. In addition, the appearance of the electronic device may be rectangular, circular, polygonal, a shape with curved edges, or other suitable shapes. The electronic device may have peripheral systems such as a drive system, a control system, a light source system, a shelf system, etc. to support the display device, the antenna device, or the tiled device. Hereinafter, the display device is used as the electronic device to explain the present disclosure, but the present disclosure is not limited thereto. If the electronic device is an antenna device or other devices, its minimum working unit can be equivalent to the pixel unit of the display device. 
     The sensors in the present disclosure can be applied to sensing applications such as light, heat, pressure, electromagnetic force, vibration, sound, gravity, ultrasonic wave, length, image, touch control, or fingerprint identification, and are not limited to specific functions. The embodiments of the present disclosure take fingerprint identification sensing as an example, but not limited thereto. 
     A pixel unit in a display device may include a plurality of sub-pixels disposed side by side with each other. In one embodiment, the sub-pixels in the display device may include green, red, and blue sub-pixels, or green, red, blue, and yellow sub-pixels, or green, red, blue, and white sub-pixels, and these different colors of lights generated by the sub-pixels can be used to display color images, but not limited thereto. The color of light provided by the sub-pixels can be designed according to requirements. In another embodiment, the display device may be a monochrome display device, in which all sub-pixels may emit light of a single color, such as white, red, or any suitable color. In addition, the shape of the sub-pixel in the top view may include rectangle, parallelogram, “&gt;”-shape, or any suitable shape. 
     Referring to  FIG.  1    and  FIG.  2   ,  FIG.  1    is a schematic diagram illustrating a display device according to a first embodiment of the present disclosure, and  FIG.  2    is a circuit diagram of the display device in  FIG.  1   . In order to make the drawings more simple and easy to understand,  FIG.  1    only shows the structure of a pixel unit of the display device  100 , and omits thin film transistors, capacitors, scan lines, data lines, emission signal lines (power lines), reset signal lines, read signal lines, or other related driving signal lines in the pixel circuitry and fingerprint sensor circuitry. In addition,  FIG.  4    to  FIG.  8    in the present disclosure also only show the structure of one of the pixel units in the display device  100  as an example. The display device  100  of this embodiment may include a substrate  102  (shown in  FIG.  3   ), a plurality of pixel circuitries, a plurality of fingerprint sensor circuitries, a plurality of light emitting units, and a plurality of fingerprint sensor units. The pixel circuitries, the fingerprint sensor circuitries, the light emitting units, and the fingerprint sensor units may be disposed on the substrate  102 . The light emitting units may be disposed above the pixel circuitries (e.g., upward emitting type) or the light emitting units may be disposed below the pixel circuitries (e.g., downward emitting type), and the light emitting units may be electrically connected to the pixel circuitries and driven by the pixel circuitries. The fingerprint sensor units may be disposed above the fingerprint sensor circuitries or the fingerprint sensor units may be disposed below the fingerprint sensor circuitries, and the fingerprint sensor units may be electrically connected to the fingerprint sensor circuitries and driven by the fingerprint sensor circuitries. In this embodiment, the material of the substrate  102  may include glass, quartz, sapphire, polymers (such as polyimide (PI), polyethylene terephthalate (PET)), and/or other suitable materials to be used as a flexible substrate or a rigid substrate, but not limited thereto. 
     The technical features of this embodiment are described with one of the pixel units in the display device  100  hereinafter. As shown in  FIG.  1   , the display device  100  may include a first light emitting unit  1041 , a second light emitting unit  1043 , and a third light emitting unit  1045 . The first light emitting unit  1041 , the second light emitting unit  1043 , and the third light emitting unit  1045  may be disposed side by side along a first direction D 1 , and the third light emitting unit  1045  may be disposed between the first light emitting unit  1041  and the second light emitting unit  1043 , but not limited thereto. In this embodiment, the first light emitting unit  1041 , the second light emitting unit  1043 , and the third light emitting unit  1045  may emit different color lights. The first light emitting unit  1041  may emit blue light, the second light emitting unit  1043  may emit red light, and the third light emitting unit  1045  may emit green light, but not limited thereto. In this embodiment, the light emitting units may include organic light emitting diodes (OLED), but not limited thereto. In some embodiments, the light emitting units may include OLED, LED, mini LED, micro-LED, quantum dot LED (QLED, QDLED), or any combination thereof, but not limited thereto. In some embodiments, the light emitting units may be different portions of the liquid crystal display used for emitting different color lights, but not limited thereto. In some embodiments, the light emitting units may also emit other kinds of light in non-visible wavelength band, such as ultraviolet light or infrared light. 
     In the first light emitting unit  1041 , the second light emitting unit  1043 , and third light emitting unit  1045  in  FIG.  1   , the range or boundary of each of the light emitting units may be defined by the range or boundary of one of the electrodes of the OLED, but not limited thereto. For example, the light emitting unit may be a diode. Generally, the diode may mainly include an anode (bottom electrode), a light emitting layer, and a cathode (top electrode). The anode may usually be electrically connected to a thin film transistor, the cathode may be electrically connected to a common voltage source, and light can be emitted when current flows through the light emitting layer. The range or boundary of each of the light emitting unit may be defined by the range or boundary of the bottom electrode or anode of OLED, but not limited thereto. In addition, the actual light emitting area of each of the light emitting units may be greater than, equal to, or less than the area of the bottom electrode. The shape of the light emitting unit is not limited to that shown in  FIG.  1   , and the light emitting unit may have different shapes according to requirements. 
     As shown in  FIG.  1   , the area of the first light emitting unit  1041  may be greater than the area of the second light emitting unit  1043 , and the area of the second light emitting unit  1043  may be greater than the area of the third light emitting unit  1045 , but not limited thereto. The areas of the light emitting units can be designed according to the lifetimes, luminous efficiencies, or hue requirements of light emitting materials used for emitting different color lights. For example, when the lifetime of the light emitting material used for emitting light with a certain color is short, the area of the light emitting unit used for emitting this light may be increased, whereas when the lifetime of the light emitting material used for emitting light of a certain color is long, the area of the light emitting unit used for emitting this light may be reduced, but not limited thereto. 
     As shown in  FIG.  1    and  FIG.  2   , the display device  100  may include a first pixel circuitry  1061 , a second pixel circuitry  1063 , and a third pixel circuitry  1065 . The first pixel circuitry  1061 , the second pixel circuitry  1063 , and the third pixel circuitry  1065  may be disposed side by side along the first direction D 1 , and the third pixel circuitry  1065  may be disposed between the first pixel circuitry  1061  and the second pixel circuitry  1063 , but not limited thereto. The first light emitting unit  1041  may be disposed above (or below) the first pixel circuitry  1061 , and the first light emitting unit  1041  may be electrically connected to the first pixel circuitry  1061  and driven by the first pixel circuitry  1061 . The first light emitting unit  1041  may overlap with the first pixel circuitry  1061  in a top view direction V, and a portion of the first light emitting unit  1041  may extend out of the first pixel circuitry  1061 , but not limited thereto. The top view direction V may be, for example, a normal direction perpendicular to the surface of the substrate  102 . The second light emitting unit  1043  may be disposed above (or below) the second pixel circuitry  1063 , the second light emitting unit  1043  may be electrically connected to the second pixel circuitry  1063  and driven by the second pixel circuitry  1063 , and the second light emitting unit  1043  may overlap with the second pixel circuitry  1063  in the top view direction V. The third light emitting unit  1045  may be disposed above (or below) the third pixel circuitry  1065 , the third light emitting unit  1045  may be electrically connected to the third pixel circuitry  1065  and driven by the third pixel circuitry  1065 , and the third light emitting unit  1045  may overlap with the third pixel circuitry  1065  in the top view direction V. In this embodiment, the area of the first pixel circuitry  1061 , the area of the second pixel circuitry  1063 , and the area of the third pixel circuitry  1065  may be approximately equal, but not limited thereto. In addition, the shape of the pixel circuitry is not limited to that shown in  FIG.  1   , and the pixel circuitry may have different shapes according to requirements. 
     In addition, the display device  100  may include a plurality of scan lines, a plurality of data lines, and a plurality of emission signal lines disposed on the substrate  102 . As shown in  FIG.  1    and  FIG.  2   , the scan lines (such as the scan line  1121  and the scan line  1123 ) may extend along the first direction D 1 , the data lines  114  and the emission signal lines  116  (shown in  FIG.  2   ) may extend along a second direction D 2 , and the data lines  114  and the emission signal lines  116  may cross the scan line  1121  and the scan line  1123 , but not limited thereto. In other embodiments, the data lines  114 , the emission signal lines  116 , and the scan lines  1121 ,  1123  may not necessarily be straight lines, but they may still substantially extend in a direction. In other embodiments, the scan lines  1121 ,  1123  may extend in different directions, the data lines  114  or the emission signal lines  116  may also extend in other directions different from the second direction D 2 , and the data lines  114  or the emission signal lines  116  may be partially or completely parallel to the scan lines  1121 ,  1123 . 
     The first pixel circuitry  1061 , the second pixel circuitry  1063 , and the third pixel circuitry  1065  in  FIG.  1    and  FIG.  2    may all be electrically connected to the scan line  1121  and respectively electrically connected to one of the data lines  114  and one of the emission signal lines  116 . In addition, the scan line  1123  may be electrically connected to the first pixel circuitry  1061 , the second pixel circuitry  1063 , and the third pixel circuitry  1065  in another row. Taking  FIG.  2    as an example, each of the pixel circuitries may include two thin film transistors electrically connected to each other, the gate of the thin film transistor T 11  may be electrically connected to the scan line  1121 , the first terminal of the thin film transistor T 11  may be electrically connected to one of the data lines  114 , and the second terminal of the thin film transistor T 11  may be electrically connected to the gate of another thin film transistor T 12 , but not limited thereto. The first terminal of the thin film transistor T 12  may be electrically connected to the emission signal line  116 , the second terminal of the thin film transistor T 12  may be electrically connected to the corresponding light emitting unit, and the emission signal line  116  may provide a voltage to the thin film transistor T 12 , but not limited thereto. In addition, the first terminal and the second terminal of the thin film transistor described herein may be, for example, source and drain, or drain and source. 
     Referring to  FIG.  2   , the pixel circuitry in this disclosure may include, for example, the thin film transistors electrically connected to the corresponding light emitting unit and/or the thin film transistors used for driving the corresponding light emitting unit, and the area and boundary of the pixel circuitry may be the area and boundary occupied by these elements. The pixel circuitry may not include the data lines  114 , scan lines  1121 ,  1123 , emission signal lines  116 , or other signal lines used for transmitting signals. Specifically, the pixel circuitry may include a portion of signal lines used for forming the structure of the thin film transistor. For example, a portion of the scan line forming the gate of the thin film transistor, a portion of the data line, or a portion of the emission signal line. In addition, the number or connection relationship of the thin film transistors in the pixel circuitry of the present disclosure is not limited to the above description. Each of the pixel circuitries may include, for example, more than two thin film transistors, such as three, four, six, seven, or other numbers of thin film transistors. The definition of fingerprint sensor circuitry is basically similar to that of the pixel circuitry. The difference is that the fingerprint sensor circuitry is electrically connected to the fingerprint sensor unit and drives the fingerprint sensor unit, and the connection of thin film transistors in the fingerprint sensor circuitry and the number of thin film transistors in the fingerprint sensor circuitry may be different from those of thin film transistors in the pixel circuitry. Moreover, in some embodiments, the pixel circuitry  1061 / 1063 / 1065  and the fingerprint sensor circuitry  110  are electrically connected to the same scan line  1121 , but not limited thereto. 
     Referring to  FIG.  1   , the display device  100  may include a fingerprint sensor unit  108  and a fingerprint sensor circuitry  110 . The fingerprint sensor unit  108  may be disposed above the fingerprint sensor circuitry  110  (e.g., top side sensing) or the fingerprint sensor unit  108  may be disposed below the fingerprint sensor circuitry  110  (e.g., bottom side sensing), the fingerprint sensor unit  108  may be electrically connected to the fingerprint sensor circuitry  110  and driven by the fingerprint sensor circuitry  110 , and the fingerprint sensor unit  108  may overlap with the fingerprint sensor circuitry  110  in the top view direction V. The fingerprint sensor unit  108  of this embodiment may include a photodiode (such as a PIN diode or other suitable photoelectric conversion elements) used for detecting the intensity of light reflected by the finger to perform fingerprint identification, but not limited thereto. In other embodiments, the fingerprint sensor unit  108  may include a capacitor or a piezoelectric element. In some embodiments, the fingerprint sensor unit  108  may be capacitors or pressure sensing elements, the fingerprint sensor unit  108  may not be used for fingerprint sensing, the fingerprint sensor unit  108  may be used for touch sensing, pressure sensing, etc. for example. In addition, the shapes of the fingerprint sensor unit  108  and the fingerprint sensor circuitry  110  are not limited to those shown in  FIG.  1   , and may have different shapes according to requirements. 
     As shown in  FIG.  1   , in the second direction D 2 , the fingerprint sensor circuitry  110  may be disposed on one side of the first pixel circuitry  1061 , the second pixel circuitry  1063 , and the third pixel circuitry  1065 , and the fingerprint sensor unit  108  may be disposed on one side of the second light emitting unit  1043  and the third light emitting unit  1045 , but not limited thereto. For example, the second direction D 2  may be perpendicular to the first direction D 1 , but not limited thereto. In this embodiment, the first light emitting unit  1041  may extend to the top of the fingerprint sensor circuitry  110  along the second direction D 2 , and the first light emitting unit  1041  may overlap with at least a portion of the fingerprint sensor circuitry  110  in the top view direction V, but not limited thereto. In addition, the second light emitting unit  1043  and the third light emitting unit  1045  do not extend to the top of the fingerprint sensor circuitry  110 , but not limited thereto. In some embodiments, the third light emitting unit  1045  may extend to the top of the fingerprint sensor circuitry  110  in the second direction D 2 , and the third light emitting unit  1045  may overlap at least a portion of the fingerprint sensor circuitry  110  in the top view direction V. Further, the first light emitting unit  1041  and the second light emitting unit  1043  do not extend to the top of the fingerprint sensor circuitry  110 , and the fingerprint sensor unit  108  may be disposed on one side of the first light emitting unit  1041  and the second light emitting unit  1043 , but not limited thereto. 
     In addition, the ratios of areas between the fingerprint sensor unit and the light emitting units can be adjusted according to requirements of the display effect or fingerprint sensitivity. For example, in this embodiment, the ratio of the area of the fingerprint sensor unit  108  to the area of the first light emitting unit  1041  may be 0.1 to 2 (greater than or equal to 0.1 and less than or equal to 2), or may be 0.1 to 1 (greater than or equal to 0.1 and less than or equal to 1). The range or boundary of the fingerprint sensor unit  108  may be defined by the range or boundary of one of the electrodes (such as the bottom electrode) of the photodiode, but not limited thereto. The display device  100  may have high density of fingerprint sensor units  108  and may provide high sensitivity of fingerprint sensing while maintaining high resolution of the display image when the ratio is in the above range. In addition, the ratio of the area of the fingerprint sensor unit  108  to the area of the second light emitting unit  1043 , or the ratio of the area of the fingerprint sensor unit  108  to the area of the third light emitting unit  1045  may also be in the above range, but not limited thereto. 
     In the pixel unit in  FIG.  1   , the fingerprint sensor circuitry  110  may be electrically connected to two adjacent scan lines  1121 ,  1123  through a conductive line  1111  and a conductive line  1113 . Taking  FIG.  2    as an example, the fingerprint sensor circuitry  110  may include at least two thin film transistors electrically connected to each other. The gate of the thin film transistor T 21  may be electrically connected to the scan line  1121 , the first terminal of the thin film transistor T 21  may be electrically connected to a reset signal line  118 , and the second terminal of the thin film transistor T 21  may be electrically connected to the fingerprint sensor unit  108 , but not limited thereto. The gate of the thin film transistor T 22  may be electrically connected to the scan line  1123 , the first terminal of the thin film transistor T 21  may be electrically connected to the fingerprint sensor unit  108 , and the second terminal of the thin film transistor T 21  may be electrically connected to the read signal line  120 , but not limited thereto. Thus, the integrated circuit chip in the display device  100  may detect the change of current generated by the fingerprint sensor unit  108  through the read signal line  120 , and the fingerprint sensor unit  108  may return to the initial state through the reset signal line  118  before each operation. 
     In some variant embodiments of the first embodiment, the thin film transistor T 21  of the fingerprint sensor circuitry  110  may not be electrically connected to the scan line  1121 . For example, the display device  100  may include a plurality of control signal lines extending parallel to the scan lines  1121 ,  1123 , and one of the control signal lines may be disposed between the scan line  1121  and the scan line  1123 . The thin film transistor T 21  may be electrically connected to the control signal line, and the thin film transistor T 22  may still be electrically connected to the scan line  1123 , but not limited thereto. 
     Similar to the definition of the pixel circuitry, the fingerprint sensor circuitry  110  may include, for example, at least one thin film transistor electrically connected to the corresponding fingerprint sensor unit  108  and/or used for driving the corresponding fingerprint sensor unit  108 , and the area and boundary of the fingerprint sensor circuitry  110  may be the area and boundary occupied by these elements. The fingerprint sensor circuitry  110  may not include the data line  114 , scan lines  1121 ,  1123 , emission signal line  116 , reset signal line  118 , read signal line  120 , or other signal lines used for transmitting signals. Specifically, the fingerprint sensor circuitry  110  may include a portion of signal lines used for forming the structure of thin film transistors, such as a portion of the scan line used for forming the gate of the thin film transistor. In addition, the number of the thin film transistors in the fingerprint sensor circuitry  110  of the present disclosure or the connection relationship of the thin film transistors in the fingerprint sensor circuitry  110  of the present disclosure is not limited to the above description. Each of the fingerprint sensor circuitries  110  may include, for example, more than two thin film transistors, such as three, four, six, seven, or other numbers of thin film transistors. 
     The operation of the fingerprint sensing of the display device  100  of this embodiment can be described by the following examples, but not limited thereto. For example, the display device  100  may include the display function, touch sensing function, and fingerprint sensing function. The display device  100  can determine the touch position when the user&#39;s finger touches the display device  100  and when the display device  100  displays images or does not display images. The display device  100  can drive pixels disposed near the touch position to emit green light (which can also be other color light with high sensitivity to sensors), and drive the fingerprint sensor disposed near the touch position to detect fingerprints. 
     As described above, in the display device  100  of this embodiment, each of the pixel units includes the fingerprint sensor unit  108  and the fingerprint sensor circuitry  110  used for driving the fingerprint sensor unit  108  in addition to the red sub-pixel, blue sub-pixel, green sub-pixel, and the pixel circuitry used for driving the above sub-pixels. The fingerprint sensor can be integrated into the display region of the display device  100 , and the display region can be further expanded to make the edge of the display region closer to the edge of the display device  100 , thereby achieving the advantage of enlarging the screen proportion or narrowing the frame. In addition, the fingerprint sensor circuitry  110  and the pixel circuitries of this embodiment can electrically connected to the scan lines  1121 ,  1123  without additionally disposing signal lines for transmitting signals to the fingerprint sensor circuitry  110 , which can reduce the number of conductive lines in the display device  100  and save space. The cross-sectional structure of the display device  100  of this embodiment will be described below. 
     Referring to  FIG.  3   , it is a cross-sectional schematic diagram illustrating a structure taken along the line A-A′ of  FIG.  1   . In order to make the drawing more simplified and easy to understand,  FIG.  3    only shows one of the thin film transistors in the first pixel circuitry  1061  and one of the thin film transistors in the fingerprint sensor circuitry  110  as an example. The numbers of thin film transistors in the first pixel circuitry  1061  and the fingerprint sensor circuitry  110  are not limited to that shown in  FIG.  3   . In the top view direction V, the thin film transistor T 1  of the first pixel circuitry  1061  may be disposed between the first light emitting unit  1041  and the substrate  102 , and the thin film transistor T 2  of the fingerprint sensor circuitry  110  may be disposed between the fingerprint sensor unit  108  and the substrate  102 , but not limited thereto. The thin film transistor T 1  and the thin film transistor T 2  may be disposed on a buffer layer  122 , and the thin film transistor T 1  and the thin film transistor T 2  (or the first pixel circuitry  1061  and the fingerprint sensor circuitry  110 ) of this embodiment may be disposed on the same plane, but not limited thereto. In an embodiment, the thin film transistor T 1  and the thin film transistor T 2  both directly disposed on a top surface of the buffer layer  122 . In another embodiment, the buffer layer  122  may be disposed between the thin film transistors T 1 , T 2  and the substrate  102 . In addition, the display device  100  may further include a light shielding layer  124  disposed between the thin film transistor T 1  and the substrate  102 , and the light shielding layer  124  may be disposed under the buffer layer  122 . 
     The thin film transistors T 1 , T 2  respectively may include a gate GE, a source SE, a drain DE, and a semiconductor layer SC. The semiconductor layer SC may be disposed on the buffer layer  122 , and two doped regions of the semiconductor layer SC respectively may be located at two ends of the semiconductor layer SC, and the doped regions respectively may be used for electrically connecting the source SE and the drain DE. The gate GE may be disposed on the semiconductor layer SC, and a gate insulating layer GI may be disposed between the gate GE and the semiconductor layer SC. An interlayer dielectric layer ILD may cover the gate GE, and the source SE and the drain DE may be disposed on the interlayer dielectric layer ILD. In addition, an insulating layer BP may cover the source SE and the drain DE, and a planarization layer PLN may be disposed on the insulating layer BP. The laminated structures of the above-mentioned thin film transistors T 1 , T 2  may be top gate thin film transistors for example, the thin film transistors T 1 , T 2  may also be bottom gate thin film transistors according to the requirements, or the material of the semiconductor layer may also be adjusted according to the requirements. 
     The first light emitting unit  1041  may be disposed on the planarization layer PLN. The first light emitting unit  1041  of this embodiment may be an OLED for example. The first light emitting unit  1041  may include a lower electrode BE 1 , a light emitting material layer EL, and an upper electrode TE 1 , but not limited thereto. The bottom electrode BE 1  may be disposed on the planarization layer PLN and electrically connected to the drain DE of the thin film transistor T 1 . The bottom electrode BE 1  may be, for example, an anode of the first light emitting unit  1041 , but not limited thereto. The light emitting material layer EL may be disposed on the bottom electrode BE 1  and in an opening of a pixel defining layer PDL. The light emitting material layer EL may include the organic light emitting material, but not limited thereto. The top electrode TE 1  may be disposed on the light emitting material layer EL and the pixel definition layer PDL, and the top electrode TE 1  may be, for example, a common cathode electrically connected to a common voltage signal source, but not limited thereto. 
     The fingerprint sensor unit  108  may be disposed on the planarization layer PLN and covered by the pixel definition layer PDL. Therefore, the first light emitting unit  1041  and the fingerprint sensor unit  108  may be disposed on the same plane, but not limited thereto. The fingerprint sensor unit  108  may also be disposed on the insulating layer BP. The fingerprint sensor unit  108  of this embodiment may include a PIN diode (or may be an inorganic or organic diode), but not limited thereto. The PIN diode may include a first semiconductor layer SM 1 , a second semiconductor layer SM 2 , and a third semiconductor layer SM 3 . The third semiconductor layer SM 3  may be disposed on the first semiconductor layer SM 1 , and the second semiconductor layer SM 2  may be disposed between the first semiconductor layer SM 1  and the third semiconductor layer SM 3 . The first semiconductor layer SM 1  may be N-type semiconductor layer, the second semiconductor layer SM 2  may be an intrinsic layer, and the third semiconductor layer SM 3  may be P-type semiconductor layer, but not limited thereto. In some embodiments, the first semiconductor layer SM 1  may be P-type semiconductor layer, and the third semiconductor layer SM 3  may be N-type semiconductor layer. In addition, the fingerprint sensor unit  108  may further include a top electrode TE 2  and a bottom electrode BE 2  disposed on the upper and lower sides of the PIN diode. The bottom electrode BE 2  may be disposed between the planarization layer PLN and the first semiconductor layer SM 1 , and the bottom electrode BE 2  may be electrically connected to the drain DE of the thin film transistor T 2 . The top electrode TE 2  may be disposed between the third semiconductor layer SM 3  and the pixel defining layer PDL, and the top electrode TE 2  may be electrically connected to a signal line TE 3 . In addition, an inorganic insulating layer IN 1  may be disposed on the top electrode TE 1 , an inorganic insulating layer IN 2  may be disposed on the inorganic insulating layer IN 1 , and an organic insulating layer IN 3  may be disposed between the inorganic insulating layer IN 1  and the inorganic insulating layer IN 2 , but not limited thereto. 
     For example, the materials of the gate GE, the source SE, the drain DE, and/or the bottom electrodes BE 1 , BE 2  may include metals (e.g., silver (Ag), copper (Cu), or aluminum (Al)), metal oxides, other suitable conductive materials, or combinations thereof, but not limited thereto. The materials of the top electrodes TE 1 , TE 2  may include transparent conductive materials (e.g., indium tin oxide (ITO), indium zinc oxide (IZO), etc.), metals (e.g., silver (Ag)), other suitable conductive materials, or combinations thereof, but not limited thereto. The materials of the buffer layer  122 , the gate insulating layer GI, the interlayer dielectric layer ILD, the insulating layer BP, the planarization layer PLN, and/or the pixel defining layer PDL may include silicon oxide, silicon nitride, silicon oxynitride, other suitable insulating materials, or combinations thereof, but not limited thereto. The material of the semiconductor layer SC may include polycrystalline silicon, amorphous silicon, metal oxide semiconductor (IGZO), other suitable semiconductor materials, or combinations thereof, but not limited thereto. The material of the light shielding layer  124  may include metal or metal oxide, but not limited thereto. 
     The display device of the present disclosure is not limited by the aforementioned embodiment, and may have other different embodiments and variant embodiments. To simplify the description, similar components in each of the following embodiments are marked with similar symbols. For making it easier to compare the difference between the embodiments, the following description will detail the dissimilarities among different embodiments and the similar features will not be redundantly described. 
     Referring to  FIG.  4   , it is a schematic diagram illustrating a display device according to a second embodiment of the present disclosure. Different from the first embodiment, the second light emitting unit  1043  of this embodiment may also extend to the top of the fingerprint sensor circuitry  110  along the second direction D 2 , and the second light emitting unit  1043  may overlap with at least another portion of the fingerprint sensor circuitry  110  in the top view direction V, but not limited thereto. In this embodiment, the first light emitting unit  1041  and the second light emitting unit  1043  can be extended to the top of the fingerprint sensor circuitry  110  by reducing the area of the fingerprint sensor unit  108 , but not limited thereto. Additionally, the third light emitting unit  1045  of this embodiment may not extend to the top of the fingerprint sensor circuitry  110 , but not limited thereto. In this embodiment, the first light emitting unit  1041  may emit blue light, the second light emitting unit  1043  may emit red light, and the third light emitting unit  1045  may emit green light, but not limited thereto. In addition, the overlapping area of the second light emitting unit  1043  and the fingerprint sensor circuitry  110  may be less than the overlapping area of the first light emitting unit  1045  and the fingerprint sensor circuitry  110 , but not limited thereto. However, in some embodiments, the first light emitting unit  1041  may emit blue light, the second light emitting unit  1043  may emit green light, and the third light emitting unit  1045  may emit red light, or in some embodiments, the first light emitting unit  1041  may emit green light, but not limited thereto. 
     Referring to  FIG.  5   , it is a schematic diagram illustrating a display device according to a third embodiment of the present disclosure. Different from the first embodiment, the area of the first pixel circuitry  1061  may be reduced, the area of the fingerprint sensor circuitry  110  may be increased, and the area of the first pixel circuitry  1061  may be less than the area of the second pixel circuitry  1063  and/or the area of the third pixel circuitry  1065  in this embodiment. The area of the pixel circuitry or the area the fingerprint sensor circuitry  110  may be adjusted by adjusting the number of thin film transistors included therein or the sizes (e.g., areas) of the thin film transistors. For example, the first pixel circuitry  1061  may include three to four thin film transistors, and the second pixel circuitry  1063  and the third pixel circuitry  1065  may include six to seven thin film transistors, but not limited thereto. For example, the second pixel circuitry  1063  and the third pixel circuitry  1065  may include compensation circuits, and the first pixel circuitry  1061  may not include the compensation circuit and require an external compensation circuit, but not limited thereto. Alternatively, the first pixel circuitry  1061 , the second pixel circuitry  1063 , and the third pixel circuitry  1065  may include the same number of thin film transistors, but the sizes of the thin film transistors in the first pixel circuitry  1061  may be less than the sizes of the thin film transistors in the second pixel circuitry  1063  and the third pixel circuitry  1065 . In addition, the above method of adjusting the size of the circuitry can also be applied to the fingerprint sensor circuitry  110  or other embodiments. 
     In some variant embodiments of the third embodiment, the difference between these variant embodiments and the third embodiment is that the area of the second light emitting unit  1043  and/or the area of the third light emitting unit  1045  may be reduced and the area of the fingerprint sensor unit  108  may be increased, a portion of the fingerprint sensor unit  108  may extend to the top of the second pixel circuitry  1063  and the third pixel circuitry  1065  along the second direction D 2 , and the portion of the fingerprint sensor unit  108  may partially overlap with the second pixel circuitry  1063  and the third pixel circuitry  1065 , but not limited thereto. 
     Referring to  FIG.  6   , it is a schematic diagram illustrating a display device according to a fourth embodiment of the present disclosure. Different from the first embodiment, the area of the first pixel circuitry  1061  may be less than the area of the second pixel circuitry  1063  and the area of the third pixel circuitry  1065 , and the area of the fingerprint sensor circuitry  110  may be less than the area of the first pixel circuitry  1061  in this embodiment, but not limited thereto. For example, the first pixel circuitry  1061  and the fingerprint sensor circuitry  110  may be disposed on one side of the third pixel circuitry  1065  in the first direction D 1 , and the fingerprint sensor circuitry  110  may be disposed on one side of the first pixel circuitry  1061  in the second direction D 2 , but not limited thereto. In addition, the fingerprint sensor unit  108  may partially overlap with at least one of the first pixel circuitry  1061 , the second pixel circuitry  1063 , and the third pixel circuitry  1065 . Taking  FIG.  6    as an example, the fingerprint sensor unit  108  may partially overlap with the first pixel circuitry  1061 , the second pixel circuitry  1063 , and the third pixel circuitry  1065 , but not limited thereto. 
     In some embodiments, the difference between these embodiments and the fourth embodiment is that the area of the second pixel circuitry  1063  and the area of the third pixel circuitry  1065  may be less than the area of the first pixel circuitry  1061 , but not limited thereto. For example, the second pixel circuitry  1063 , the third pixel circuitry  1065 , and the fingerprint sensor circuitry  110  may be disposed on one side of the first pixel circuitry  1061  in the first direction D 1 , and the fingerprint sensor circuitry  110  may be disposed on one side of the second pixel circuitry  1063  and the third pixel circuitry  1065  in the second direction D 2 , but not limited thereto. 
     Referring to  FIG.  7   , it is a schematic diagram illustrating a display device according to a fifth embodiment of the present disclosure. Different from the first embodiment, the first pixel circuitry  1061 , the second pixel circuitry  1063 , the third pixel circuitry  1065 , and the fingerprint sensor circuitry  110  of this embodiment may be disposed side by side along the first direction D 1 , and the first pixel circuitry  1061  may be disposed between the third pixel circuitry  1065  and the fingerprint sensor circuitry  110 , but not limited thereto. In addition, the fingerprint sensor unit  108  may extend from the fingerprint sensor circuitry  110  to the second pixel circuitry  1063  and cross the first pixel circuitry  1061  and the third pixel circuitry  1065 , but not limited thereto. 
     Referring to  FIG.  8    and  FIG.  9   ,  FIG.  8    is a schematic diagram illustrating a display device according to a sixth embodiment of the present disclosure, and  FIG.  9    is a cross-sectional schematic diagram illustrating a structure taken along the line B-B′ of  FIG.  8   . In order to make the drawings more simple and easy to understand,  FIG.  9    only illustrates three thin film transistors T 1   a , T 1   b , and T 1   c  in the first pixel circuitry  1061  and one of the thin film transistors (the thin film transistor T 2 ) in the fingerprint sensor circuitry  110  as an example. The numbers of thin film transistors in the first pixel circuitry  1061  and the fingerprint sensor circuitry  110  are not limited to that shown in  FIG.  9   . As shown in  FIG.  8   , the difference between this embodiment and the first embodiment is that the fingerprint sensor circuitry  110  of this embodiment may overlap with a portion of the first pixel circuitry  1061  in the top view direction V. Taking  FIG.  9    as an example, the thin film transistor T 2  of the fingerprint sensor circuitry  110  may be disposed between the fingerprint sensor unit  108  and the thin film transistor T 1   c  of the first pixel circuitry  1061  in the top view direction V. The thin film transistor T 2  (or the fingerprint sensor circuitry  110 ) and the thin film transistors T 1   a , T 1   b , and T 1   c  (or the first pixel circuitry  1061 ) may be disposed on different planes in this embodiment. For example, the thin film transistors T 1   a , T 1   b , and T 1   c  may be disposed on the buffer layer  122 , and the thin film transistor T 2  may be disposed on the insulating layer BP, but not limited thereto. Since the thin film transistor T 2  and the thin film transistors T 1   a , T 1   b , and T 1   c  may be disposed on different planes, the display device  100  of this embodiment may further include a gate insulating layer GI 2  and an insulating layer BP 2 , the gate insulating layer GI 2  may be disposed between the gate GE and the semiconductor layer SC of the thin film transistor T 2 , and the insulating layer BP 2  may be disposed between the gate insulating layer GI 2  and the planarization layer PLN and cover the source SE and the drain DE of the thin film transistor T 2 , but not limited thereto. In this embodiment, the thin film transistors T 1   a , T 1   b , and T 1   c  may be top-gate type thin film transistors and the thin film transistor T 2  may be a bottom-gate type thin film transistor, but not limited thereto. 
     Referring to  FIG.  10   , it is a schematic diagram illustrating a display device according to a seventh embodiment of the present disclosure. Different from the first embodiment, the display device  100  of this embodiment may include a plurality of sub-pixel columns SPC 1  and a plurality of sub-pixel columns SPC 2 , and the sub-pixel columns SPC 1  and the sub-pixel columns SPC 2  may be alternately disposed in the first direction D 1 , but not limited thereto. Each of the sub-pixel columns SPC 1  may include a plurality of first light emitting units  1041 , a plurality of first pixel circuitries  1061 , a plurality of second light emitting units  1043 , a plurality of second pixel circuitries  1063 , a plurality of fingerprint sensor units  108 , and a plurality of fingerprint sensor circuitries  110 . In the second direction D 2 , the first light emitting units  1041  and the second light emitting units  1043  may be alternately disposed, and one of the fingerprint sensor units  108  may be disposed between one of the first light emitting units  1041  and one of the second light emitting units  1043 , but not limited thereto. In the first direction D 1 , the first light emitting units  1041  and the second light emitting units  1043  in the same row may be alternately disposed also. In addition, in the second direction D 2 , the first pixel circuitries  1061  and the second pixel circuitries  1063  may be alternately disposed, and one of the fingerprint sensor circuitries  110  may be disposed between one of the first pixel circuitries  1061  and one of the second pixel circuitries  1063 , but not limited thereto. Each of the first light emitting units  1041  and each of the second light emitting units  1043  respectively may overlap with at least a portion of one of the fingerprint sensor circuitries  110  in the top view direction V, and each of the fingerprint sensor units  108  may overlap with at least a portion of one of the first pixel circuitries  1061  or one of the second pixel circuitries  1063  in the top view direction V, but not limited thereto. 
     Each of the sub-pixel columns SPC 2  may include a plurality of third light emitting units  1045  and a plurality of third pixel circuitries  1065  disposed along the second direction D 2 . In the first direction D 1 , one of the third light emitting units  1045  may be disposed between two of the fingerprint sensor units  108 , and each of the third pixel circuitries  1065  may be disposed between one of the first pixel circuitries  1061  and one of the second pixel circuitries  1063  and between two of the fingerprint sensor circuitries  110 , but not limited thereto. The area of one of the third pixel circuitries  1065  may be greater than the area of one of the first pixel circuitries  1061  and/or the area of one of the second pixel circuitries  1063 , but not limited thereto. In this embodiment, the shapes of the third light emitting units  1045  and the fingerprint sensor units  108  may be rectangular (and the edges may have rounded corners), and the shapes of the first light emitting units  1041  and the second light emitting units  1043  may be rhombus (and the edges may have rounded corners), but not limited thereto. 
     Referring to  FIG.  11   , it is a schematic diagram illustrating a display device according to an eighth embodiment of the present disclosure. Different from the seventh embodiment, the plurality of fingerprint sensor units  108  and the plurality of fingerprint sensor circuitries  110  of this embodiment may be disposed in the sub-pixel columns SPC 2 . One of the fingerprint sensor units  108  may be disposed between two of the third light emitting units  1045  adjacent to each other (“adjacent” is defined as that no other third light emitting unit exists on the shortest connection line between two third light emitting units) in the second direction D 2 , and the fingerprint sensor unit  108  may be disposed between one of the first light emitting units  1041  and one of the second light emitting units  1043  in the first direction D 1 , but not limited thereto. One of the fingerprint sensor circuitries  110  may be disposed between two of the third pixel circuitries  1065  adjacent to each other in the second direction D 2 , and the fingerprint sensor circuitry  110  may be disposed between one of the first pixel circuitries  1061  and one of the second pixel circuitries  1063  in the first direction D 1 , but not limited thereto. Therefore, the area of one of the third pixel circuitries  1065  may be less than the area of one of the first pixel circuitries  1061  and/or the area of one of the second pixel circuitries  1063  in this embodiment, but not limited thereto. In addition, one of the third light emitting units  1045  may overlap with at least a portion of one of the fingerprint sensor circuitries  110  in the top view direction V, and one of the fingerprint sensor units  108  may overlap with at least a portion of one of the third pixel circuitries  1065  in the top view direction V, but not limited thereto. 
     In this embodiment, the shape of the fingerprint sensor unit  108  may be a “X” shape (and the edges may have rounded corners), but not limited thereto. In some variant embodiments of the eighth embodiment, the shape of the fingerprint sensor unit  108  may be a frame shape, and each of the fingerprint sensor units  108  may surround one of the third light emitting units  1045 . In addition, each of the fingerprint sensor units  108  may be disposed between one of the third light emitting units  1045  and one of the first light emitting units  1041  adjacent thereto, and between the third light emitting unit  1045  and one of the second light emitting units  1043  adjacent thereto, but not limited thereto. In some variant embodiments of the eighth embodiment, the shape of the fingerprint sensor unit  108  may be the frame shape with rounded corners, but not limited thereto. 
     Referring to  FIG.  12   , it is a schematic diagram illustrating a display device according to a ninth embodiment of the present disclosure. Different from the seventh embodiment, the fingerprint sensor units  108  and the fingerprint sensor circuitries  110  of this embodiment may be disposed in the sub-pixel columns SPC 2 , and the fingerprint sensor units  108  may replace some of the third light emitting units  1045  in the seventh embodiment. For example, one of the fingerprint sensor units  108  may be disposed between two of the first light emitting units  1041  adjacent to each other, two of the second light emitting units  1043  adjacent to each other, and two of the third light emitting units  1045  adjacent to each other. In addition, in the second direction D 2 , one of the fingerprint sensor units  108  may be disposed between a group S 11  of one of the first light emitting units  1041 , one of the second light emitting units  1043 , and one of the third light emitting units  1045  and another group S 12  of one of the first light emitting units  1041 , one of the second light emitting units  1043 , and one of the third light emitting units  1045 . Another difference between this embodiment and the seventh embodiment is that the density of the fingerprint sensor units  108  of this embodiment may be smaller, and the area of the fingerprint sensor unit  108  may be larger, but not limited thereto. In addition, since the fingerprint sensor circuitries  110  of this embodiment may be disposed in the sub-pixel columns SPC 2  with the fingerprint sensor units  108 , the areas of some of the third pixel circuitries  1065  may be less than the area of the first pixel circuitry  1061  and/or the area of the second pixel circuitry  1063 , but not limited thereto. 
     To sum up, the display device of the present disclosure integrates the fingerprint sensor units and the fingerprint sensor circuitries into the display region by integrating a plurality of fingerprint sensor units and a plurality of fingerprint sensor circuitries into a plurality of pixel units, and therefore the sub-pixels emitting different colors and the fingerprint sensor can be included in one of the pixel units. Under this design, the display device can include the fingerprint sensor units with high density and can provide the fingerprint sensing function having high sensitivity while maintaining the high resolution of the display image. In addition, under this design, the light emitting unit of at least one of the sub-pixels may overlap with at least a portion of the fingerprint sensor circuitry in the top view direction in one pixel unit. 
     The above description refers to embodiments of the present disclosure, and it is not intended to limit the present disclosure. For those skilled in the art, the present disclosure can be modified or adjusted. As long as the different features between the embodiments do not conflict or depart from the spirit of the present disclosure, they can be rearranged or combined arbitrarily according to the designs. Any modification, equivalent substitution, improvement, etc. made within the spirit or principles of the present disclosure shall be included within the scope of the present disclosure.