Display device

Abstract

A display device includes a display panel that displays an image by generating light, a sensor disposed below the display panel to convert light energy into electrical energy, a voltage generator connected to the sensor, and a capacitive element connected to the sensor. The electrical energy generated by the sensor is charged into the capacitive element. The sensor senses an object using light reflected by the object.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2020-0089881, filed on July 20, 2020, which is incorporated herein by reference for all purposes, as if fully set forth herein. Technical Field

[0003] Exemplary implementations of the present invention generally relate to a display device, and more specifically, to a display device including a fingerprint sensor that can be used as a solar cell. Background Technology

[0004] Recently, display devices may include a display panel for displaying images and a fingerprint sensor for sensing a user's fingerprint.

[0005] Various methods, such as the capacitance-covering method that detects changes in capacitance between electrodes, optical methods that use optical sensors to detect incident light, and ultrasonic methods that use piezoelectric materials to detect vibrations, are being used as fingerprint sensing methods. The fingerprint sensor can be positioned below the display panel.

[0006] Specifically, when light generated by the display panel is provided to the user's fingerprint, an optically operated fingerprint sensor senses the light reflected from the fingerprint to detect the user's fingerprint.

[0007] The information disclosed in this background section is only for understanding the background of the inventive concept, and therefore may contain information that does not constitute prior art. Summary of the Invention

[0008] A display device comprising a fingerprint sensor and a capacitive element, constructed according to the principles and exemplary implementations of the present invention, can use the fingerprint sensor as a solar cell to charge the capacitive element, and can use the charged capacitive element as an auxiliary battery. For example, when the display device is not operating in fingerprint authentication mode, the electrical energy generated by the fingerprint sensor is charged into the capacitive element, and therefore, the capacitive element serves as an auxiliary battery to power the voltage generator of the display device. Thus, the fingerprint sensor is used in a more efficient manner.

[0009] Additional features of the inventive concept will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the inventive concept.

[0010] According to one aspect of the present invention, a display device includes: a display panel for displaying an image by generating light; a sensor disposed below the display panel for converting light energy into electrical energy; a voltage generator connected to the sensor; and a capacitor element connected to the sensor. The electrical energy generated by the sensor is charged into the capacitor element. The sensor uses light reflected from an object to sense the object.

[0011] Capacitive elements may include capacitors.

[0012] Capacitors can have capacitance ranging from approximately 100 farads (F) to approximately 1,000 farads (F).

[0013] The sensor may include a fingerprint sensor having at least one optical sensor for converting light energy into electrical energy, and the object may include a fingerprint.

[0014] The fingerprint sensor can be connected to a capacitor via a voltage generator.

[0015] The display device may further include a fingerprint sensing controller connected to the fingerprint sensor, which receives the fingerprint sensed by the fingerprint sensor when the fingerprint is provided to the display panel and outputs fingerprint information obtained by processing the sensed fingerprint.

[0016] The display device may further include: a first switch connected to the fingerprint sensor and the voltage generator; a second switch connected to the fingerprint sensor and the fingerprint sensing controller; and a control module for controlling the first switch and the second switch.

[0017] The control module can be configured to turn on the first switch and turn off the second switch when the fingerprint is not provided to the display panel.

[0018] The sensor can be configured to receive external light and internal light generated by the display panel, and convert the external light and internal light into electrical energy, which is then charged into the capacitor element via a voltage generator.

[0019] The control module can be configured to turn on the second switch and turn off the first switch when a fingerprint is provided to the display panel.

[0020] The display device may further include an input sensing unit disposed on the display panel, wherein the input sensing unit is configured to provide touch information of the fingerprint to the control module when the fingerprint is provided to the display panel.

[0021] A voltage generator can be configured to receive electrical energy from a capacitor element.

[0022] The display device may further include an adhesive layer disposed between the display panel and the fingerprint sensor.

[0023] The sum of the thickness of the adhesive layer and the thickness of the fingerprint sensor can be equal to or less than approximately 0.1 mm.

[0024] According to another aspect of the present invention, a display device includes: a display panel; a fingerprint sensor disposed below the display panel; a first switch; a voltage generator connected to the fingerprint sensor via the first switch; a capacitor element connected to the voltage generator; a second switch; a fingerprint sensing controller connected to the fingerprint sensor via the second switch; and a control module for controlling the switching operations of the first switch and the second switch.

[0025] The control module can be configured to turn on the first switch and turn off the second switch when the fingerprint is not provided to the display panel.

[0026] The light supplied to the fingerprint sensor can be converted into electrical energy, and the electrical energy can be supplied to the capacitor element via a first switch and a voltage generator.

[0027] The control module can be configured to turn on the second switch and turn off the first switch when a fingerprint is provided to the display panel.

[0028] The fingerprint sensor can be configured to sense fingerprints, and the sensed fingerprints are provided to the fingerprint sensing controller via a second switch that is turned on.

[0029] It should be understood that both the foregoing general description and the following detailed description are exemplary and illustrative, and are intended to provide further explanation of the claimed invention. Attached Figure Description

[0030] The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the invention and, together with the description, serve to explain the inventive concept.

[0031] Figure 1 This is a perspective view of an exemplary embodiment of a display device constructed according to the principles of the present invention.

[0032] Figure 2 yes Figure 1 Block diagram of the display device shown.

[0033] Figure 3 yes Figure 1 The plan view of the display device shown.

[0034] Figure 4 Is included Figure 3 A cross-sectional view of the pixels in the display device shown.

[0035] Figure 5 yes Figure 3The side view of the display panel shown.

[0036] Figure 6 yes Figure 5 The image shows a side view of the display panel in a curved position.

[0037] Figure 7 yes Figure 6 The diagram shows a plan view of the rear surface of the display panel.

[0038] Figure 8 Is with Figure 7 The diagram shows a cross-sectional view of the portion corresponding to the fingerprint sensor of the display device.

[0039] Figure 9 This is an equivalent circuit diagram of an exemplary embodiment of an optical sensor included in a fingerprint sensor.

[0040] Figure 10 It is shown Figure 2 The diagram shows the connection relationship between the fingerprint sensing unit and its surrounding components.

[0041] Figure 11 It is shown Figure 8 and Figure 10 The image shows a cross-sectional view of the fingerprint sensor's fingerprint sensing operation.

[0042] Figure 12 It is shown Figure 10 The diagram shows a block diagram of the fingerprint sensing operation of the fingerprint sensing unit.

[0043] Figure 13 It is shown Figure 8 and Figure 10 The diagram shows a cross-sectional view of the fingerprint sensor's operation in receiving external and internal light.

[0044] Figure 14 It is shown Figure 10 The diagram shows the charging operation of the fingerprint sensor and capacitive element.

[0045] Figure 15 This is a cross-sectional view of another exemplary embodiment of a display device constructed according to the principles of the present invention. Detailed Implementation

[0046] In the following description, numerous specific details are set forth for purposes of explanation in order to provide a thorough understanding of various exemplary embodiments or implementations of the invention. As used herein, “embodiment” and “implementation” are interchangeable terms for non-limiting examples of apparatuses or methods employing one or more of the inventive concepts disclosed herein. However, it will be apparent, however, that various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and apparatuses are illustrated in block diagram form to avoid unnecessarily obscuring the various exemplary embodiments. Furthermore, the various exemplary embodiments may differ, but are not necessarily exclusive. For example, a particular shape, configuration, and characteristic of one exemplary embodiment may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0047] Unless otherwise specified, the illustrated exemplary embodiments should be understood as providing exemplary features of different details of how the inventive concept can be implemented in practice. Therefore, unless otherwise specified, features, components, modules, layers, films, panels, regions and / or aspects, etc. (hereinafter collectively referred to as “elements”) of various embodiments may be combined, separated, interchanged and / or rearranged in other ways without departing from the inventive concept.

[0048] The use of crosshairs and / or shading in the accompanying drawings is generally provided to clarify the boundaries between adjacent elements. Therefore, unless otherwise specified, the presence or absence of crosshairs or shading does not convey or indicate any preference or requirement for a particular material, material properties, size, scale, commonalities between elements, and / or any other characteristics, properties, etc., of the elements. Furthermore, in the accompanying drawings, the dimensions and relative dimensions of elements may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented in different ways, specific processes may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Moreover, the same reference numerals refer to the same elements.

[0049] When a component or layer is referred to as being "on," "connected to," or "coupled to" another component or layer, the component or layer may be directly on, directly connected to, or coupled to the other component or layer, or there may be intermediate components or layers present. However, when a component or layer is referred to as being "directly" on, directly connected to, or directly coupled to another component or layer, there are no intermediate components or layers present. Therefore, the term "connection" can refer to a physical connection, electrical connection, and / or fluid connection with or without intermediate components. Furthermore, the DR1, DR2, and DR3 axes are not limited to the three axes of a Cartesian coordinate system (such as the x, y, and z axes) but can be interpreted in a broader sense. For example, the DR1, DR2, and DR3 axes can be perpendicular to each other, or they can represent different directions that are not perpendicular to each other. For the purposes of this disclosure, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" can be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as, for example, XYZ, XYY, YZ, and ZZ. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] Although the terms “first,” “second,” etc., may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Therefore, the first element discussed below may be referred to as the second element without departing from the teachings of this disclosure.

[0051] For descriptive purposes, spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “above,” “above,” and “side” (e.g., as in “sidewall”) may be used herein to describe the relationship between one element and another(s) as shown in the figures. In addition to the orientations depicted in the figures, the spatial relative terms are intended to cover different orientations of the device in use, operation, and / or manufacture. For example, if the device in the figure is flipped, an element described as “below” or “under” other elements or features would then be oriented “above” other elements or features. Thus, the exemplary term “below” can cover both above and below orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or in other orientations), and therefore, the spatial relative descriptors used herein should be interpreted accordingly.

[0052] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a” and “the (described)” as used herein are also intended to include the plural forms. Furthermore, when used herein, the terms “comprising” and / or “including” indicate the presence of the stated features, integrals, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. It should also be noted that, as used herein, the terms “generally,” “about,” and other similar terms are used as approximations rather than terms of degree, and are therefore used to include inherent deviations in measured, calculated, and / or provided values ​​recognized by those skilled in the art.

[0053] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure is a part. Terms such as those defined in common dictionaries shall be interpreted as having meaning consistent with their meaning in the context of the relevant field and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0054] Figure 1 This is a perspective view of an exemplary embodiment of a display device DD constructed according to the principles of the present invention.

[0055] refer to Figure 1 The display device DD may have a rectangular shape defined by a long side extending in a first direction DR1 and a short side extending in a second direction DR2 intersecting the first direction DR1. However, the shape of the display device DD should not be limited to a rectangular shape, and the display device DD may have various shapes, such as a circular shape or a polygonal shape other than a rectangular shape.

[0056] In the following text, the direction substantially perpendicular to the plane defined by the first direction DR1 and the second direction DR2 may be referred to as the "third direction DR3".

[0057] The upper surface of the display device DD can be referred to as the "display surface DS", and can be a planar surface defined by a first direction DR1 and a second direction DR2. The image IM generated by the display device DD can be provided to the user through the display surface DS.

[0058] The display surface DS may include a display area DA and a non-display area NDA defined around the display area DA. The display area DA may display an image, and the non-display area NDA may not display an image. The non-display area NDA may surround the display area DA and may define an edge of the display device DS printed in a predetermined color.

[0059] The display device DD can be applied to large electronic products such as televisions, monitors, or billboards, as well as small and medium-sized electronic products such as personal computers, laptops, personal digital assistants, car navigation units, gaming units, smartphones, tablets, and cameras. However, these are merely exemplary, and the display device DD can be applied to other electronic products as long as they do not depart from the inventive concept of the embodiments.

[0060] Figure 2 yes Figure 1 The block diagram of the display device DD shown is shown.

[0061] refer to Figure 2 The display device DD may include a display module DM, a power module PM, a first electronic module EM1, and a second electronic module EM2. The display module DM, the power module PM, the first electronic module EM1, and the second electronic module EM2 may be electrically connected to each other.

[0062] The power module PM supplies the power required for the overall operation of the display device DD. The power module PM may include a standard battery module.

[0063] The first electronic module EM1 and the second electronic module EM2 may include various functional modules for driving the display device DD. The first electronic module EM1 may be directly mounted on the motherboard that is electrically connected to the display module DM, or it may be mounted on a separate substrate and then electrically connected to the motherboard via a connector (not shown).

[0064] The first electronic module EM1 may include a control module CM, a wireless communication module TM, an image input module IIM, an audio input module AIM, a memory MM, and an external interface IF. Some of these modules can be electrically connected to the motherboard via a flexible circuit board without needing to be mounted on the motherboard.

[0065] The control module CM controls the overall operation of the display device DD. The control module CM can activate or deactivate the display module DM. The control module CM can control other modules, such as the image input module IIM or the audio input module AIM, based on touch signals provided from the display module DM. Additionally, the control module CM can use fingerprint information provided from the display module DM to perform user authentication.

[0066] The wireless communication module TM can use Bluetooth or WiFi links to send / receive wireless signals to other terminals. The wireless communication module TM can use general communication lines to send / receive voice signals. The wireless communication module TM may include a transmitter TM1 that modulates the signal to be transmitted and transmits the modulated signal, and a receiver TM2 that demodulates the signal applied thereto.

[0067] The image input module (IIM) can process image signals and convert them into image data that can be displayed by the display module (DM). The audio input module (AIM) can receive external sound signals via a microphone in recording mode or voice recognition mode, and can convert the external sound signals into electronic voice data.

[0068] The external interface IF can be used as an interface between the control module CM and external devices such as external chargers, wired / wireless data ports, cards (e.g., memory cards and SIM / UIM cards).

[0069] The second electronic module EM2 may include an audio output module AOM, a light-emitting module LM, a light-receiving module LRM, and a camera module CMM. These modules can be directly mounted on the motherboard, or electrically connected to the display module DM via connectors (not shown) after being mounted on a separate substrate, or electrically connected to the first electronic module EM1.

[0070] The audio output module AOM can convert audio data provided by the wireless communication module TM or audio data stored in the memory MM, and can output the converted audio data to an external source. The light-emitting module LM can generate and output light. The light-emitting module LM can emit infrared light. The light-emitting module LM may include LED elements. The light-receiving module LRM can sense infrared light. When infrared light of a predetermined level or higher is sensed, the light-receiving module LRM can be activated. The light-receiving module LRM may include a complementary metal-oxide-semiconductor (CMOS) sensor.

[0071] Infrared light generated and output by the light-emitting module LM can be reflected by external objects (e.g., a user's finger or face), and the reflected infrared light can be incident on the light-receiving module LRM. The camera module CMM can then capture images of the external objects.

[0072] The display module DM may include a display panel DP, an input sensing unit ISP, and a fingerprint sensing unit FSP. The display panel DP can display images using image data provided by the control module CM. The control module CM can drive the display module DM in an initial mode and a main mode thereafter. Specifically, the display panel DP can be driven in the initial mode and the main mode in response to the control of the control module CM, and therefore can display the image corresponding to the initial mode and the image corresponding to the main mode.

[0073] In initial mode, the control module CM can perform user authentication. When the user is authenticated as the owner of the display device DD in initial mode, the control module CM can drive the display panel DP in main mode. In main mode, the display panel DP can display various images desired by the user. User authentication can be performed using fingerprint authentication.

[0074] The input sensing unit (ISP) can sense external input, such as a user's hand or a stylus, and can send the sensed signal as an input signal to the control module (CM). The control module (CM) can control the operation of the display panel (DP) in response to the input signal. When a fingerprint is provided to the display panel (DP), the input sensing unit (ISP) can provide the fingerprint's touch information to the control module (CM).

[0075] When the display panel DP is driven in initial mode, the fingerprint sensing unit FSP can sense the fingerprint of the finger touching the display module DM. The fingerprint information sensed by the fingerprint sensing unit FSP can be sent to the control module CM.

[0076] The control module CM can receive fingerprint touch information and control the operation of the fingerprint sensing unit FSP. When the control module CM receives fingerprint touch information, it can control the fingerprint sensing unit FSP to sense the fingerprint of the finger on the touch display module DM.

[0077] The control module CM can compare the sensed fingerprint information with the user's fingerprint information stored therein. When the sensed fingerprint information matches the user's fingerprint information, the control module CM can drive the display panel DP, causing the display panel DP to switch from the initial mode to the main mode.

[0078] When the control module CM does not receive fingerprint touch information, the control module CM can control the fingerprint sensing unit FSP, so that the current generated by the fingerprint sensing unit FSP is charged into the capacitor element. This operation will be described in detail later.

[0079] Figure 3 yes Figure 1 The plan view of the display device DD shown.

[0080] refer to Figure 3 The display device DD may include a display panel DP, a scan driver SDV, a data driver DDV, a transmit driver EDV, a printed circuit board PCB, a capacitor element CAP, a voltage generator VG, a timing controller T-CON, and a fingerprint sensor FSN.

[0081] Display panel DP can be a light-emitting display panel, but it should not be particularly limited to it. For example, display panel DP can be an organic light-emitting display panel or a quantum dot light-emitting display panel. The light-emitting layer of an organic light-emitting display panel may include organic light-emitting materials. The light-emitting layer of a quantum dot light-emitting display panel may include quantum dots and quantum rods. In the following, an organic light-emitting display panel will be described as a representative example of display panel DP.

[0082] The display panel DP can be a flexible display panel. For example, the display panel DP may include multiple electronic components arranged on a flexible substrate. The display panel DP may extend longer in a first direction DR1 than in a second direction DR2. The display panel DP may include a plane defined by the first direction DR1 and the second direction DR2.

[0083] The display panel DP may include a first region AA1, a second region AA2, and a flexible region BA disposed between the first region AA1 and the second region AA2. The first region AA1, the flexible region BA, and the second region AA2 may be arranged in a first direction DR1, and the flexible region BA may extend in a second direction DR2. The flexible region BA may extend from the first region AA1 in the first direction DR1, and the second region AA2 may extend from the flexible region BA in the first direction DR1.

[0084] The first region AA1 may include long sides extending in the first direction DR1 and opposite to each other in the second direction DR2. In the second direction DR2, the flexible region BA and the second region AA2 may have lengths smaller than the length of the first region AA1.

[0085] The first region AA1 may include a display region DA and a non-display region NDA surrounding the display region DA. The non-display region NDA may surround the display region DA. The display region DA may display an image, and the non-display region NDA may not display an image. The second region AA2 and the flexible region BA may not display an image.

[0086] The display panel DP may include multiple pixels PX, multiple scan lines SL1 to SLm, multiple data lines DL1 to DLn, multiple emission lines EL1 to ELm, a first control line CSL1 and a second control line CSL2, a first power line PL1, a second power line PL2, multiple connection lines CNL, and multiple pads PD. Each of "m" and "n" is a natural number. Pixels PX may be arranged in the display area DA and may be connected to scan lines SL1 to SLm, data lines DL1 to DLn, and emission lines EL1 to ELm.

[0087] The scan driver SDV and transmit driver EDV can be located in the non-display area NDA. The scan driver SDV and transmit driver EDV can be located in the non-display area NDA, respectively, adjacent to the long side of the first area AA1. The data driver DDV can be located in the second area AA2.

[0088] The data driver DDV can be manufactured as an integrated circuit chip and then installed in the second region AA2. The data driver DDV can be referred to as the driver IC. Scan lines SL1 to SLm can extend in the second direction DR2 and can be connected to the scan driver SDV. Data lines DL1 to DLn can extend in the first direction DR1 and can be connected to the data driver DDV via the flexible region BA. Transmit lines EL1 to ELm can extend in the second direction DR2 and can be connected to the transmit driver EDV.

[0089] The first power line PL1 may extend along the first direction DR1 and may be located in the non-display area NDA. The first power line PL1 may be located between the display area DA and the transmit driver EDV, but it should not be limited thereto or restricted by this. The first power line PL1 may be located between the display area DA and the scan driver SDV.

[0090] The first power line PL1 can extend through the flexible region BA into the second region AA2. When viewed in a plane, the first power line PL1 can extend to the lower end of the second region AA2. The first power line PL1 can receive a first voltage.

[0091] The second power line PL2 can be located in the non-display area NDA facing the second region AA2 (where the display area DA is located between the second region AA2 and the non-display area NDA) and in the non-display area NDA adjacent to the long side of the first region AA1. The second power line PL2 can be located outside the scan driver SDV and the transmit driver EDV.

[0092] The second power line PL2 can extend through the flexible region BA into the second region AA2. The second power line PL2 can extend along the first direction DR1 within the second region AA2, such that the data driver DDV is positioned between the two ends of the second power line PL2. When viewed in a plane, the second power line PL2 can extend towards the lower end of the second region AA2.

[0093] The second power line PL2 can receive a second voltage with a voltage level lower than the first voltage. For ease of illustration, although the connection relationship is not shown, the second power line PL2 can extend in the display area DA and can be connected to the pixel PX, and the second voltage can be applied to the pixel PX through the second power line PL2.

[0094] The connecting line CNL can extend along the second direction DR2 and can be arranged along the first direction DR1. The connecting line CNL can be connected to the first power line PL1 and the pixel PX. A first voltage can be applied to the pixel PX through the first power line PL1 and the connecting line CNL connected to the first power line PL1.

[0095] The first control line CSL1 can be connected to the scan driver SDV and can extend through the flexible region BA toward the lower end of the second region AA2. The second control line CSL2 can be connected to the transmit driver EDV and can extend through the flexible region BA toward the lower end of the second region AA2. The data driver DDV can be positioned between the first control line CSL1 and the second control line CSL2.

[0096] When viewed in a plane, pad PD can be positioned adjacent to the lower end of the second region AA2. Data driver DDV, first power line PL1, second power line PL2, first control line CSL1, and second control line CSL2 can be connected to pad PD.

[0097] Data lines DL1 to DLn can be connected to their corresponding pads PD via the data driver DDV. For example, data lines DL1 to DLn can be connected to the data driver DDV, and the data driver DDV can be connected to the pads PD corresponding to the data lines DL1 to DLn respectively.

[0098] A printed circuit board (PCB) can be connected to pads (PDs). A timing controller (T-CON) can be mounted on the PCB. The timing controller (T-CON) can be manufactured within an integrated circuit chip and can be mounted on the PCB. The timing controller (T-CON) can be connected to pads (PDs) via the PCB.

[0099] The voltage generator VG can be mounted on a printed circuit board (PCB). The voltage generator VG can be connected to pads PD that are connected to the first power line PL1 and the second power line PL2.

[0100] The fingerprint sensor FSN can be located adjacent to the printed circuit board (PCB). Although not shown in the figure, the fingerprint sensor FSN can be connected to the voltage generator VG and the capacitor element CAP.

[0101] Capacitors (CAPs) can be mounted on a printed circuit board (PCB), but they should not be limited to or restricted by this. Capacitors (CAPs) can be mounted in various locations. For example, capacitors (CAPs) can be mounted externally to the PCB and can be connected to the PCB via a connector (not shown).

[0102] A capacitor element CAP can be connected to a voltage generator VG. The capacitor element CAP can include capacitors. The capacitors in the capacitor element CAP can have various capacitances. For example, the capacitor element CAP can have capacitances ranging from hundreds of farads (F) to thousands of farads (F).

[0103] The timing controller T-CON can control the operation of the scan driver SDV, the data driver DDV, and the transmit driver EDV. The timing controller T-CON can generate scan control signals, data control signals, and transmit control signals in response to control signals applied to it from an external source (not shown).

[0104] Figure 2 The fingerprint sensing unit FSP shown may include a fingerprint sensor FSN. For example, as Figure 9 As shown, the fingerprint sensor FSN may include multiple optical sensors PS, and each of the optical sensors PS may include a photodiode PTD. The optical sensors PS can convert light energy into electrical energy. The fingerprint sensor FSN can sense a fingerprint provided on the display panel DP. In addition, the fingerprint sensor FSN can convert external light and internal light into electrical energy.

[0105] The capacitor element CAP can receive electrical energy from the fingerprint sensor FSN via the voltage generator VG, and can also be charged with electrical energy. The capacitor element CAP can be used as an auxiliary battery. The electrical energy charged in the capacitor element CAP can be supplied to the voltage generator VG.

[0106] Scan control signals can be applied to the scan driver SDV via the first control line CSL1. Transmit control signals can be applied to the transmit driver EDV via the second control line CSL2. Data control signals can be applied to the data driver DDV. The timing controller T-CON can receive image signals from the outside, convert the image signal data format to a format suitable for the interface between the timing controller T-CON and the data driver DDV, and provide the converted image signal to the data driver DDV.

[0107] The scan driver SDV can generate multiple scan signals in response to scan control signals. Scan signals can be applied to pixels PX via scan lines SL1 to SLm. Scan signals can be applied to pixels PX sequentially.

[0108] The data driver DDV can generate multiple data voltages corresponding to the image signal in response to a data control signal. These data voltages can be applied to the pixel PX via data lines DL1 to DLn. The transmit driver EDV can generate multiple emission signals in response to a transmit control signal. These emission signals can be applied to the pixel PX via transmit lines EL1 to ELm.

[0109] A pixel (PX) can receive a data voltage in response to a scan signal. A pixel (PX) can emit light with a brightness corresponding to the data voltage in response to a light emission signal, and thus can display an image. The emission time of a pixel (PX) can be controlled by the light emission signal.

[0110] Figure 4 Is included Figure 3 A cross-sectional view of pixel PX in the display device DD shown.

[0111] refer to Figure 4 The pixel PX can be disposed on the substrate SUB and can include a transistor TR and a light-emitting element OLED. The light-emitting element OLED can include a first electrode AE, a second electrode CE, a hole control layer HCL, an electron control layer ECL, and a light-emitting layer EML. The first electrode AE ​​can be an anode electrode, and the second electrode CE can be a cathode electrode.

[0112] Transistors (TRs) and light-emitting elements (OLEDs) can be mounted on a substrate (SUB). As an example, in... Figure 4 The diagram shows a transistor TR; however, a pixel PX may include multiple transistors for driving the light-emitting element OLED and at least one capacitor element.

[0113] The display area DA may include a light-emitting area PA corresponding to each pixel PX and a non-light-emitting area NPA surrounding the light-emitting area PA. The light-emitting element OLED may be disposed in the light-emitting area PA.

[0114] The substrate SUB may comprise a flexible plastic material. As an example, the substrate SUB may comprise transparent polyimide (PI). A buffer layer BFL may be disposed on the substrate SUB, and the buffer layer BFL may be an inorganic layer. A semiconductor pattern may be disposed on the buffer layer BFL. The semiconductor pattern may comprise polycrystalline silicon, but it should not be limited thereto or thereby restricted. The semiconductor pattern may comprise amorphous silicon or metal oxide.

[0115] Semiconductor patterns can be doped with N-type or P-type dopants. Semiconductor patterns can have different electrical properties depending on whether they are doped with P-type or N-type dopants. Semiconductor patterns can include highly doped and lightly doped regions. Highly doped regions can have higher conductivity than lightly doped regions and can essentially serve as the source and drain of a transistor TR. Lightly doped regions can essentially correspond to the active region (or channel) of a transistor TR.

[0116] The source (S), active region (A), and drain (D) of transistor TR can be formed from a semiconductor pattern. A first insulating layer (INS1) can be disposed on the semiconductor pattern. The gate (G) of transistor TR can be disposed on the first insulating layer (INS1). A second insulating layer (INS2) can be disposed on the first insulating layer (INS1) to cover the gate (G). A third insulating layer (INS3) can be disposed on the second insulating layer (INS2).

[0117] The connecting electrode CNE can be disposed between the transistor TR and the light-emitting element OLED to connect the transistor TR to the light-emitting element OLED. The connecting electrode CNE may include a first connecting electrode CNE1 and a second connecting electrode CNE2.

[0118] The first connecting electrode CNE1 can be disposed on the third insulating layer INS3, and can be connected to the drain electrode D through a first contact hole CH1 defined by the first insulating layer INS1, the second insulating layer INS2, and the third insulating layer INS3. A fourth insulating layer INS4 can be disposed on the third insulating layer INS3 to cover the first connecting electrode CNE1. A fifth insulating layer INS5 can be disposed on the fourth insulating layer INS4.

[0119] The second connecting electrode CNE2 can be disposed on the fifth insulating layer INS5 and can be connected to the first connecting electrode CNE1 through the second contact hole CH2 defined by the fourth insulating layer INS4 and the fifth insulating layer INS5. A sixth insulating layer INS6 can be disposed on the fifth insulating layer INS5 to cover the second connecting electrode CNE2. Each of the first insulating layer INS1 to the sixth insulating layer INS6 can be an inorganic layer or an organic layer.

[0120] A first electrode AE ​​can be disposed on a sixth insulating layer INS6. The first electrode AE ​​can be connected to a second connecting electrode CNE2 through a third contact hole CH3 defined through the sixth insulating layer INS6. A pixel defining layer PDL can be disposed on the first electrode AE ​​and the sixth insulating layer INS6 to expose a predetermined portion of the first electrode AE. The pixel defining layer PDL can be provided with an opening PX_OP defined therethrough to expose that portion of the first electrode AE.

[0121] The hole control layer (HCL) can be disposed on the first electrode (AE) and the pixel definition layer (PDL). The HCL can also be commonly disposed in the light-emitting region (PA) and the non-light-emitting region (NPA). The HCL may include a hole transport layer and a hole injection layer.

[0122] The luminescent layer (EML) can be disposed on the hole control layer (HCL). The EML can be disposed in the region corresponding to the opening (PX_OP). The EML can include organic and / or inorganic materials. The EML can produce light of one of the colors red, green, and blue.

[0123] The electronic control layer (ECL) can be disposed on the light-emitting layer (EML) and the hole control layer (HCL). The ECL can be commonly disposed in the light-emitting region (PA) and the non-light-emitting region (NPA). The ECL may include an electron transport layer and an electron injection layer.

[0124] The second electrode CE can be disposed on the electronic control layer ECL. The second electrode CE can also be commonly disposed in the pixel PX. The layer from the buffer layer BFL to the light-emitting element OLED can be referred to as the pixel layer PXL.

[0125] A thin-film encapsulation layer (TFE) can be disposed on the light-emitting element (OLED). The thin-film encapsulation layer (TFE) can be disposed on the second electrode (CE) to cover the pixel (PX). The thin-film encapsulation layer (TFE) may include a first encapsulation layer (EN1) disposed on the second electrode (CE), a second encapsulation layer (EN2) disposed on the first encapsulation layer (EN1), and a third encapsulation layer (EN3) disposed on the second encapsulation layer (EN2).

[0126] Each of the first encapsulation layer EN1 and the third encapsulation layer EN3 can be an inorganic layer, and the second encapsulation layer EN2 can be an organic layer. The first encapsulation layer EN1 and the third encapsulation layer EN3 can protect the pixel PX from moisture and oxygen. The second encapsulation layer EN2 can protect the pixel PX from foreign matter such as dust particles.

[0127] A first voltage can be applied to the first electrode AE ​​via transistor TR, and a second voltage having a voltage level lower than the first voltage can be applied to the second electrode CE. Holes and electrons injected into the light-emitting layer EML can recombine to generate excitons, and the light-emitting element OLED can emit light by excitons returning from the excited state to the ground state.

[0128] Figure 5 yes Figure 3 The side view of the display panel DP shown. Figure 6 yes Figure 5 The image shows a side view of the display panel DP in a curved position. Figure 7 yes Figure 6 The diagram shows a plan view of the rear surface of the display panel DP.

[0129] As an example, Figure 5 The side surface of the display panel DP is shown when viewed in the second direction DR2, and the printed circuit board PCB is connected to the display panel DP.

[0130] refer to Figure 5 and Figure 6 The timing controller T-CON and voltage generator VG can be mounted on the printed circuit board (PCB). Although the capacitor CAP is not shown in the side view due to its position, it can be mounted on the PCB. The PCB can be connected to the second area AA2.

[0131] refer to Figure 6 and Figure 7 The bendable area BA can be bent, and therefore, the second area AA2 can be positioned below the first area AA1. The printed circuit board (PCB) can be positioned below the display panel (DP). The timing controller T-CON and the voltage generator VG can be positioned below the display panel (DP). The fingerprint sensor FSN can be positioned below the display panel (DP). The fingerprint sensor FSN can be positioned adjacent to the printed circuit board (PCB). The fingerprint sensor FSN can be positioned below a portion of the display panel (DP).

[0132] Figure 8 Is with Figure 7 The cross-sectional view of the portion corresponding to the fingerprint sensor FSN of the display device DD shown.

[0133] refer to Figure 8 The display device DD may include a fingerprint sensor FSN, a display panel DP, an input sensing unit ISP, an anti-reflective layer RPL, a window WIN, and a first adhesive layer AL1, a second adhesive layer AL2, and a third adhesive layer AL3.

[0134] However, the construction of the display device DD should not be limited to or restricted by this, and the display device DD may include additional components among the aforementioned components. For example, a protective film may be disposed under the display panel DP, and the fingerprint sensor FSN may be disposed under the protective film. The protective film can be attached to the display panel DP by a separate adhesive layer. Additionally, the optical system and infrared cut-off filter may be included in the fingerprint sensor FSN, or may be separately manufactured and disposed on the fingerprint sensor FSN.

[0135] A protective film protects the display panel (DP) from external scratches. The optical system can alter the path of light or refract it, making it easier for light reflected from a fingerprint to reach the fingerprint sensor (FSN). If infrared light from external sources reaches the FSN after passing through the fingerprint, it may fail to detect the fingerprint properly. An infrared cut-off filter blocks infrared light incident from the outside. Infrared light propagating from the outside to the fingerprint sensor (FSN) can be blocked by an infrared cut-off filter.

[0136] The fingerprint sensor FSN can be positioned below the display panel DP. The fingerprint sensor FSN can overlap with a portion of the display area DA. The fingerprint sensor FSN can sense a fingerprint provided on the display panel DP. Additionally, the fingerprint sensor FSN can convert external light into electrical energy.

[0137] The input sensing unit (ISP) can be directly mounted on the display panel (DP). For example, the ISP can be manufactured directly on the thin-film encapsulation layer during the manufacturing of the display device (DD); however, it should not be limited to this or restricted by it. Alternatively, the ISP can be manufactured separately from the display panel (DP) and then attached to the DP via an adhesive layer.

[0138] The input sensing unit (ISP) may include multiple sensor units (not shown) for sensing external inputs. The sensor units may sense external inputs using capacitive methods.

[0139] An anti-reflective layer RPL can be disposed on the input sensing unit ISP. The anti-reflective layer RPL can reduce the reflectivity of external light incident on the display panel DP from above the display device DD. As an example, the anti-reflective layer RPL may include a polarizing film that reduces the reflectivity of external light, and the polarizing film may include a retarder and / or a polarizer.

[0140] The window (WIN) can be placed on the anti-reflective layer (RPL). The window (WIN) can have optical transparency. The window (WIN) can include transparent plastic or glass. The window (WIN) can protect the display panel (DP), input sensing unit (ISP), and anti-reflective layer (RPL) from external scratches and impacts.

[0141] The first adhesive layer AL1 can be disposed between the window WIN and the anti-reflective layer RPL. The window WIN and the anti-reflective layer RPL can be attached to each other through the first adhesive layer AL1.

[0142] The second adhesive layer AL2 can be disposed between the anti-reflective layer RPL and the input sensing unit ISP. The anti-reflective layer RPL and the input sensing unit ISP can be attached to each other through the second adhesive layer AL2.

[0143] The third adhesive layer AL3 can be disposed between the fingerprint sensor FSN and the display panel DP. The fingerprint sensor FSN and the display panel DP can be attached to each other through the third adhesive layer AL3. The sum of the thickness of the third adhesive layer AL3 and the thickness of the fingerprint sensor FSN can be equal to or less than approximately 0.1 mm.

[0144] The first adhesive layer AL1 to the third adhesive layer AL3 may include transparent adhesive layers, such as pressure-sensitive adhesive (PSA) or optically transparent adhesive (OCA), but the adhesive layers should not be limited to or restricted by them.

[0145] Figure 9 This is an equivalent circuit diagram of an exemplary embodiment of the optical sensor PS included in the fingerprint sensor FSN.

[0146] refer to Figure 9 The optical sensor PS may include a photodiode PTD, a switching transistor ST, and a storage capacitor Cst. The anode of the photodiode PTD may be connected to a first line LI1, and the cathode of the photodiode PTD may be connected to the source of the switching transistor ST. A driving voltage Vd can be supplied to the photodiode PTD through the first line LI1.

[0147] The storage capacitor Cst can be connected to the source of the second line LI2 and the switching transistor ST. The storage voltage Vcst can be applied to the second line LI2.

[0148] The gate of the switching transistor ST can be connected to the third line LI3, and the drain of the switching transistor ST can be connected to the fourth line LI4.

[0149] When a photodiode (PTD) is driven, it converts light energy from an external source into electrical energy. The storage capacitor (Cst) can then be charged with electrical energy as its charge.

[0150] A switching signal SS can be applied to the switching transistor ST via the third line LI3, and the switching transistor ST can be turned on by the switching signal SS. The charge charged in the storage capacitor Cst can be output as a sensing signal Rx via the turned-on switching transistor ST and the fourth line LI4. The fourth line LI4 can be referred to as the "readout line".

[0151] Figure 10 It is shown Figure 2 The diagram shows the connection relationship between the fingerprint sensing unit FSP and its surrounding components.

[0152] refer to Figure 10 The fingerprint sensing unit FSP may include a fingerprint sensor FSN, a fingerprint sensing controller FSC, a first switch SW1, and a second switch SW2. The first switch SW1 may be connected to the fingerprint sensor FSN and the voltage generator VG. The second switch SW2 may be connected to the fingerprint sensor FSN and the fingerprint sensing controller FSC.

[0153] The fingerprint sensor FSN can be connected to the capacitive element CAP. Specifically, the fingerprint sensor FSN can be connected to the voltage generator VG via the first switch SW1. The fingerprint sensor FSN can be connected to the capacitive element CAP via the voltage generator VG. However, they should not be limited to this or by it, and the fingerprint sensor FSN can be connected to the capacitive element CAP via the first switch SW1. The fingerprint sensor FSN can be connected to the fingerprint sensing controller FSC via the second switch SW2.

[0154] The fourth line LI4 of the aforementioned optical sensor PS (reference) Figure 9 It can be connected to the voltage generator VG via the first switch SW1, or to the fingerprint sensor controller FSC via the second switch SW2.

[0155] The display device DD may include a main battery MBT, and the main battery MBT may be connected to a voltage generator VG. The main battery MBT can provide an input voltage Vin to the voltage generator VG. The voltage generator VG can receive the input voltage Vin and can generate a first voltage ELVDD and a second voltage ELVSS. The first voltage ELVDD and the second voltage ELVSS can be provided to the display panel DP.

[0156] A voltage generator VG can be connected to a capacitor element CAP. The voltage generator VG can supply electrical energy from the fingerprint sensor FSN to the capacitor element CAP. The voltage generator VG can also receive electrical energy from the capacitor element CAP. That is, the capacitor element CAP can be used as an auxiliary battery for the voltage generator VG.

[0157] The fingerprint sensor controller (FSC) can be connected to the control module (CM), and the control module (CM) can be connected to the input sensing unit (ISP). The control module (CM) can control the switching operation of the first switch (SW1) and the second switch (SW2). For example, the control module (CM) can turn the first switch (SW1) and the second switch (SW2) on or off.

[0158] As an example, each of the first switch SW1 and the second switch SW2 can be a transistor. In this case, the control module CM can provide control signals to the gate of each of the first switch SW1 and the second switch SW2.

[0159] The fingerprint sensing controller (FSC) can receive fingerprints sensed by the fingerprint sensor (FSN). The FSC can process the fingerprints sensed by the FSN and provide the processed fingerprints as fingerprint information to the control module (CM).

[0160] Figure 11 It is shown Figure 8 and Figure 10 The image shows a cross-sectional view of the fingerprint sensing operation of the fingerprint sensor FSN. Figure 12 It is shown Figure 10 The diagram shows a block diagram of the fingerprint sensing operation of the fingerprint sensing unit FSP.

[0161] refer to Figure 11 and Figure 12 The display panel DP can generate light L in the initial mode. When a finger FIN is provided on the display device DD in the initial mode, the fingerprint FP can make contact with the display device DD. When the fingerprint FP touches the display device DD in the initial mode, the input sensing unit ISP can provide the fingerprint touch information to the control module CM.

[0162] The control module CM can turn on the second switch SW2 and turn off the first switch SW1 in response to fingerprint touch information. That is, when the fingerprint FP touches the display device DD, the fingerprint sensor FSN can be connected to the fingerprint sensing controller FSC, but can be disconnected from the voltage generator VG and the capacitor CAP.

[0163] The fingerprint sensor FSN can sense the fingerprint FP provided on the display device DD. Light L generated by the display panel DP can be provided to the fingerprint FP and can be reflected by the fingerprint FP. The light reflected by the fingerprint FP can be provided to the fingerprint sensor FSN. The fingerprint sensor FSN can use the light reflected by the fingerprint FP to sense the fingerprint FP.

[0164] The fingerprint sensor FSN can provide the sensed fingerprint SFP to the fingerprint sensing controller FSC by turning on the second switch SW2. The fingerprint sensing controller FSC can receive the sensed fingerprint SFP from the fingerprint sensor FSN and process the sensed fingerprint SFP into fingerprint information. The fingerprint sensing controller FSC can then provide the fingerprint information to the control module CM.

[0165] The control module CM can use fingerprint information provided by the fingerprint sensing controller FSC to perform user authentication. For example, the control module CM can authenticate whether the touched fingerprint FP is the user's fingerprint.

[0166] Figure 13 It is shown Figure 8 and Figure 10 The diagram shows a cross-sectional view of the fingerprint sensor FSN receiving external and internal light. Figure 14 It is shown Figure 10 The diagram shows the charging operation of the fingerprint sensor FSN and the capacitor element CAP.

[0167] refer to Figure 13 and Figure 14 When fingerprint FP (reference) Figure 11 When there is no touch display device DD, that is, when there is no fingerprint touch information, the control module CM can turn on the first switch SW1 and turn off the second switch SW2.

[0168] For example, before a fingerprint is touched in the initial mode, or when an image is displayed in the main mode after user authentication mode, the control module CM can turn on the first switch SW1 and turn off the second switch SW2.

[0169] When the light L generated by the display panel DP propagates in the upward direction, a portion of the light L generated by the display panel DP can be reflected inside the display device DD. For example, this portion of the light L generated by the display panel DP can be reflected by the input sensing unit ISP, reflected by the anti-reflective layer RPL, or reflected by the lower surface of the window WIN, and then can propagate in the rearward direction of the display panel DP. Hereinafter, the reflected light is referred to as "internal light IL". The internal light IL can be provided to the fingerprint sensor FSN.

[0170] External light OL can be provided to the display device DD from outside the display device DD. After passing through the display panel DP, the external light OL can be provided to the fingerprint sensor FSN.

[0171] A fingerprint sensor (FSN) can convert external light (OL) and internal light (IL) into electrical energy. For example, Figure 9 The photodiode PTD of the light sensor PS shown can convert external light OL and internal light IL into electrical energy. That is, the fingerprint sensor FSN can be used as a solar cell to generate electricity using the light supplied to it. The electrical energy generated by the fingerprint sensor FSN can be charged into the capacitor element CAP.

[0172] In detail, the fingerprint sensor FSN can output electrical energy as photocurrent I. PD The photocurrent I generated by the fingerprint sensor FSN PDThe voltage generator VG can be supplied via the first switch SW1, but it should not be limited to or restricted by this. The photocurrent I generated by the fingerprint sensor FSN can be supplied via the first switch SW1. PD It is supplied to the capacitor element CAP. The voltage generator VG can convert the photocurrent I... PD Provided to capacitor element CAP. And photocurrent I. PD The corresponding charge can be injected into the capacitor element CAP.

[0173] The capacitor element CAP can supply the charge it carries to the voltage generator VG. The voltage generator VG can use the voltage supplied not only from the main battery MBT but also from the capacitor element CAP to generate a first voltage ELVDD and a second voltage ELVSS.

[0174] In an exemplary embodiment, when the display device DD does not perform fingerprint authentication, the electrical energy generated by the fingerprint sensor FSN can be stored in the capacitor element CAP and supplied to the voltage generator VG. Thus, the fingerprint sensor FSN can be used effectively.

[0175] Figure 15 This is a cross-sectional view of another exemplary embodiment of the display device DD constructed according to the principles of the present invention.

[0176] refer to Figure 15 This allows for the expansion of the fingerprint sensor FSN' in the display device DD. For example, the fingerprint sensor FSN' can have a larger size than the aforementioned fingerprint sensor FSN (see reference). Figure 8 The fingerprint sensor FSN' can completely overlap with the display area DA. In this case, the fingerprint sensor FSN' can be increased in size to the width of the display device DD. The extended fingerprint sensor FSN' can include more light sensors PS, and therefore can convert more light energy supplied to it into electrical energy.

[0177] While specific exemplary embodiments and implementations have been described herein, other embodiments and modifications will be apparent from the description. Therefore, the inventive concept is not limited to such embodiments, but rather to the broader scope of the appended claims and various obvious modifications and equivalent arrangements that will be apparent to those skilled in the art.

Claims

1. A display device, comprising: Display panel, used to display images by generating light; A sensor, located below the display panel and including a storage capacitor, is used to convert light energy into electrical energy. Voltage generator; as well as Capacitor components, When an object is provided to the display panel, the sensor is electrically disconnected from the capacitive element, and the object is sensed using the light reflected by the object. When the object is not provided to the display panel, the sensor is connected to the capacitor element and the voltage generator, so that the electrical energy generated by the sensor is charged into the capacitor element.

2. The display device according to claim 1, wherein, The capacitive element includes a capacitor, and the capacitor has a capacitance ranging from hundreds of farads to thousands of farads.

3. The display device according to claim 1, wherein, The sensor includes a fingerprint sensor having at least one optical sensor for converting the light energy into the electrical energy, and the object includes a fingerprint, and the fingerprint sensor is connected to the capacitive element via the voltage generator.

4. The display device according to claim 3, further comprising a fingerprint sensing controller connected to the fingerprint sensor, the fingerprint sensing controller receiving the fingerprint sensed by the fingerprint sensor when the fingerprint is provided to the display panel, and outputting fingerprint information obtained by processing the sensed fingerprint.

5. The display device according to claim 4, further comprising: A first switch connected to the fingerprint sensor and the voltage generator; A second switch connected to the fingerprint sensor and the fingerprint sensing controller; as well as A control module for controlling the first switch and the second switch. The control module is configured to turn on the first switch and turn off the second switch when the fingerprint is not provided to the display panel. The control module is configured to turn on the second switch and turn off the first switch when the fingerprint is provided to the display panel.

6. The display device according to claim 5, further comprising: An input sensing unit is disposed on the display panel, wherein the input sensing unit is configured to provide touch information of the fingerprint to the control module when the fingerprint is provided to the display panel.

7. The display device according to claim 1, wherein, The sensor is configured to receive external light and internal light generated by the display panel, and to convert the external light and the internal light into electrical energy, which is then charged into the capacitor element via the voltage generator.

8. The display device according to any one of claims 1 to 7, wherein, The voltage generator is configured to receive electrical energy from the capacitor element to power the light-emitting element of the display device.

9. The display device according to any one of claims 1 to 7, further comprising: An adhesive layer is disposed between the display panel and the sensor. Wherein, the sum of the thickness of the adhesive layer and the thickness of the sensor is equal to or less than 0.1 mm.

10. A display device, comprising: Display panel; A fingerprint sensor is located below the display panel and includes a storage capacitor; First switch; A voltage generator connected to the fingerprint sensor via the first switch; Capacitive elements connected to the voltage generator; Second switch; A fingerprint sensing controller connected to the fingerprint sensor via the second switch; as well as A control module for controlling the switching operations of the first switch and the second switch. The control module is configured to turn on the first switch and turn off the second switch when a fingerprint is not provided to the display panel, so that the fingerprint sensor is connected to the voltage generator and the capacitor element. The control module is also configured to turn on the second switch and turn off the first switch when a fingerprint is provided to the display panel, so that the fingerprint sensor is electrically disconnected from the voltage generator and the capacitor element.

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