Display device including biometric information sensing unit

Abstract

A display device is provided, the display device including: a display unit including a light emitting element that emits light; and a biometric information sensing unit disposed below the display unit, wherein the biometric information sensing unit receives light, and wherein the light indicates biometric authentication information, wherein the biometric information sensing unit includes: an optical system including a transmission portion that passes the light and an absorption portion around the transmission portion, wherein the absorption portion absorbs the light and pressure; a light detection sensor disposed below the transmission portion of the optical system, wherein the light detection sensor receives the light that passes through the transmission portion; and a pressure detection sensor disposed below the absorption portion of the optical system, wherein the pressure detection sensor detects the pressure transmitted from the absorption portion.

Description

[0001] This application claims priority to Korean Patent Application No. 10-2019-0161815, filed on December 6, 2019, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] Exemplary embodiments of the present invention relate to a display device, and more specifically, to a display device capable of recognizing biometric information. Background Technology

[0003] Display devices provide various functions that enable users to interact with them. For example, a display device can display images to provide information to the user or detect user input. A display device can also detect a user's fingerprint.

[0004] For example, fingerprint recognition can be achieved through capacitive methods based on changes in capacitance between electrodes, optical methods using optical sensors to detect incident light, or ultrasonic methods using piezoelectric materials to detect vibrations. In display devices, sensors for detecting fingerprints can be mounted on the back surface of the display panel. However, current sensing units used for biometric identification can have relatively long standby times. Therefore, it is necessary to reduce the standby time of such sensing units. Summary of the Invention

[0005] Some exemplary embodiments of the present invention provide a display device that can reduce the standby time of a sensing unit used for biometric information identification.

[0006] According to some exemplary embodiments of the present invention, a display device may include: a display unit including a light-emitting element; and a biometric information sensing unit disposed below the display unit, wherein the biometric information sensing unit receives light reflected by a biometric input, and wherein the light indicates biometric authentication information. The biometric information sensing unit may include: an optical system including a transmissive portion through which reflected light passes and an absorptive portion surrounding the transmissive portion, wherein the absorptive portion absorbs reflected light and pressure; a light detection sensor disposed below the transmissive portion of the optical system, wherein the light detection sensor receives reflected light passing through the transmissive portion; and a pressure detection sensor disposed below the absorptive portion of the optical system, wherein the pressure detection sensor detects pressure transmitted from the absorptive portion.

[0007] In some exemplary embodiments, the biometric information sensing unit may further include a substrate, the substrate including a sensing region and a non-sensing region surrounding the sensing region.

[0008] In some exemplary embodiments, the light detection sensor and the pressure detection sensor may be disposed in the sensing area of ​​the substrate.

[0009] In some exemplary embodiments, the sensing area may include an effective sensing area and an ineffective sensing area. A light detection sensor may be disposed within the effective sensing area. A pressure detection sensor may be disposed within the ineffective sensing area of ​​the substrate.

[0010] In some exemplary embodiments, the pressure sensing sensor may include a pressure sensing string.

[0011] In some exemplary embodiments, the pressure detection string may include: a plurality of strain detection patterns in an ineffective sensing area; and a connecting pattern that connects the plurality of strain detection patterns to each other.

[0012] In some exemplary embodiments, the sensing area may include a plurality of unit sensing areas arranged in a matrix shape. Each of the plurality of unit sensing areas may include a light detection sensor.

[0013] In some exemplary embodiments, the optical system may include a plurality of optical fibers arranged in a matrix shape. The plurality of optical fibers may be configured to correspond to a plurality of unit sensing regions.

[0014] In some exemplary embodiments, each of the plurality of optical fibers may include: a core, which serves as a transmission portion; and a cladding portion, which surrounds the core and serves as an absorption portion.

[0015] In some exemplary embodiments, the core may include: a lower portion having a first diameter; and an upper portion having a second diameter greater than the first diameter. The lower portion may be closer to the light detection sensor than the upper portion.

[0016] In some exemplary embodiments, the second diameter of the upper portion may decrease as it approaches the lower portion.

[0017] In some embodiments, the sensing area may include a plurality of unit sensing areas arranged in a matrix shape. Each of the plurality of unit sensing areas may include a plurality of active sensing areas and inactive sensing areas adjacent to the plurality of active sensing areas.

[0018] In some exemplary embodiments, the light detection sensor may include multiple light detection sensors correspondingly disposed in multiple effective sensing areas. The pressure detection sensor may be disposed in the ineffective sensing area.

[0019] In some exemplary embodiments, each of the plurality of unit sensing regions may have a quadrilateral shape. The plurality of effective sensing regions may be located at the corners of each unit sensing region.

[0020] In some exemplary embodiments, the optical system may include multiple optical fibers configured to correspond to multiple light detection sensors.

[0021] In some exemplary embodiments, the light detection sensor may include a phototransistor.

[0022] According to some exemplary embodiments of the present invention, a display device may include: a display unit including a light-emitting element; and a biometric information sensing unit disposed below the display unit, wherein the biometric information sensing unit receives light reflected from a biometric input. The biometric information sensing unit may include: a substrate including a sensing region and a non-sensing region surrounding the sensing region; an optical system located in the sensing region, wherein the optical system receives reflected light; a light detection sensor disposed in the sensing region of the substrate and below the optical system, wherein the light detection sensor receives light reflected from the optical system; a pad disposed in the non-sensing region, wherein the pad absorbs external pressure; and a pressure detection sensor disposed in the non-sensing region of the substrate and below the pad, wherein the pressure detection sensor detects pressure transmitted from the pad.

[0023] In some exemplary embodiments, the pressure sensing sensor may include multiple strain sensing patterns.

[0024] In some exemplary embodiments, the optical system may include a plurality of optical fibers disposed in the sensing region. A pad may be adjacent to the plurality of optical fibers and disposed in the non-sensing region.

[0025] In some exemplary embodiments, the light detection sensor may include a phototransistor. Attached Figure Description

[0026] Figure 1A A perspective view illustrating a display device according to some exemplary embodiments of the present invention is shown.

[0027] Figure 1B An exploded perspective view of a display device illustrating some exemplary embodiments according to the present invention is shown.

[0028] Figure 2 A simplified cross-sectional view of a display module illustrating some exemplary embodiments according to the present invention is shown.

[0029] Figure 3 A plan view illustrating a display unit according to some exemplary embodiments of the present invention is shown.

[0030] Figure 4A An enlarged cross-sectional view of a biometric information sensing unit illustrating some exemplary embodiments of the present invention is shown.

[0031] Figure 4B A plan view is shown illustrating a light detection sensor and a pressure detection sensor according to some exemplary embodiments of the present invention.

[0032] Figure 4C A plan view illustrating the arrangement of an optical system, a light detection sensor, and a pressure detection sensor according to some exemplary embodiments of the present invention is shown.

[0033] Figure 4D A plan view is shown illustrating a light detection sensor and a pressure detection sensor according to some exemplary embodiments of the present invention.

[0034] Figure 5A A plan view illustrating the arrangement of an optical system, a light detection sensor, and a pressure detection sensor according to some exemplary embodiments of the present invention is shown.

[0035] Figure 5B It shows Figure 5A A magnified planar view of the unit sensing area.

[0036] Figure 5C It shows along Figure 5A A sectional view taken by line I-I'.

[0037] Figure 5D It shows Figure 5C A perspective view of one of the multiple optical fibers shown.

[0038] Figure 5E It shows Figure 5D The image shows a partially exploded perspective view of the optical fiber.

[0039] Figure 6A A plan view is shown illustrating a light detection sensor and a pressure detection sensor according to some exemplary embodiments of the present invention.

[0040] Figure 6B A plan view illustrating the arrangement of an optical system, a light detection sensor, and a pressure detection sensor according to some exemplary embodiments of the present invention is shown.

[0041] Figure 6C It shows Figure 6B The image shows a magnified planar view of the unit sensing area.

[0042] Figure 6D It shows along Figure 6B The sectional view taken from line II-II'.

[0043] Figure 7A An enlarged cross-sectional view of a biometric information sensing unit illustrating some exemplary embodiments of the present invention is shown.

[0044] Figure 7B A plan view is shown illustrating a light detection sensor and a pressure detection sensor according to some exemplary embodiments of the present invention.

[0045] Figure 7C A plan view illustrating the arrangement of an optical system, a light detection sensor, and a pressure detection sensor according to some exemplary embodiments of the present invention is shown. Detailed Implementation

[0046] Here it will be understood that when a component (or region, layer, part, element, etc.) is referred to as being "on" another component, "connected to" or "integrated into" another component, the component may be directly disposed on, directly connected to or directly integrated into the other component, or there may be at least one intermediate component between them.

[0047] Throughout the specification, the same reference numerals may indicate the same components. Furthermore, in the drawings, the thickness of layers, films, or regions may be exaggerated for clarity.

[0048] As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “one,” and “the” are also intended to include the plural forms.

[0049] In the following description, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0050] Figure 1A A perspective view illustrating a display device according to some exemplary embodiments of the present invention is shown.

[0051] Figure 1B An exploded perspective view of a display device illustrating some exemplary embodiments according to the present invention is shown.

[0052] Figure 2 A simplified cross-sectional view of a display module illustrating some exemplary embodiments according to the present invention is shown.

[0053] Figure 3 A plan view illustrating a display unit according to some exemplary embodiments of the present invention is shown.

[0054] Reference Figure 1A and Figure 1BThe display device DD can be a device activated by an electrical signal. The display device DD can include various examples. For example, the display device DD can be used in large electronic devices (such as televisions, monitors, or billboards) and also in small to medium-sized electronic devices (such as personal computers, laptops, personal digital terminals, car navigation units, game consoles, portable electronic devices, or cameras). However, these are merely exemplary embodiments, and the display device DD can be used in any suitable electronic device consistent with the scope and spirit of the invention. In some exemplary embodiments of the invention, a smartphone is shown as an example of a display device DD.

[0055] The display device DD can display an image IM on a display surface DS parallel to each of the first direction DR1 and the second direction DR2 along a third direction DR3. The image IM can include not only dynamic images but also static images. Figure 1A An example of a clock window and an icon as an image IM is shown. The display surface DS on which the image IM is displayed can correspond to the front (or top) surface of the display device DD, and also to the front surface of the window WP.

[0056] In some exemplary embodiments of the invention, the front and rear surfaces (or top and bottom surfaces) of each component may be defined based on the direction along which the displayed image IM is traversed. The front and rear surfaces may face away from each other on a third direction DR3, and the normal direction of each of the front and rear surfaces may be parallel to the third direction DR3. The directions indicated by the first direction DR1, the second direction DR2, and the third direction DR3 are relative and may be changed to other directions. Here, the phrase "when viewed on a plane" may refer to "when viewed on the third direction DR3".

[0057] According to some exemplary embodiments of the present invention, the display device DD can detect user input applied from the outside. User input may include the user's body, light, heat, pressure, or any other suitable type of input. User input may be a combination of inputs. In some exemplary embodiments, depending on the structure of the display device DD, the display device DD can detect user input applied to the lateral surface or rear surface of the display device DD, but the present invention is not limited thereto.

[0058] The display device DD can detect user biometric authentication information applied from an external source. The biometric information sensing area BSA can be disposed on the display surface DS of the display device DD. The biometric information sensing area BSA can be disposed in all or part of the transmissive area TA. For example, Figure 1A and Figure 1BThe illustration shows a biometric sensing area (BSA) disposed within a portion of a transmission region (TA), but the invention is not limited thereto. In one exemplary embodiment of the invention, the entire transmission region (TA) can be used as the biometric sensing area (BSA).

[0059] Reference Figure 1B The display device DD may include a window WP, an anti-reflective panel RPP, a display module DM, and a housing HU. In some embodiments, the window WP and the housing HU may be combined with each other to form the display device DD.

[0060] Window films (WPs) may include optically transparent dielectric materials. For example, window films may include glass or plastic. Window films may have a single-layer or multi-layer structure. For example, a window film may include multiple plastic films bonded together by an adhesive, or a glass substrate and plastic films bonded together by an adhesive.

[0061] As described above, the front surface of the window WP can form the front surface of the display device DD. The transmissive region TA can be an optically transparent region. For example, the transmissive region TA can be a region with a visible light transmittance equal to or greater than about 90%.

[0062] The border region BZA can be a region with a transmittance relatively lower than that of the transmission region TA. The border region BZA can show the transmission region TA. The border region BZA can be adjacent to the transmission region TA and can surround the transmission region TA.

[0063] The border area BZA may have a certain color. The border area BZA may cover the peripheral area NAA of the display module DM and prevent the peripheral area NAA from being recognized externally. However, exemplary embodiments of the present invention are not limited thereto, and the border area BZA may be omitted from the window WP. For example, when omitted, the transmissive area TA may occupy the entire front surface of the window WP.

[0064] An anti-reflective panel RPP can be disposed below the window WP. The anti-reflective panel RPP can be stacked with the display module DM. The anti-reflective panel RPP can reduce the reflectivity of external light incident from the upper side of the window WP. In some exemplary embodiments of the present invention, the anti-reflective panel RPP can be omitted or can be a component included in the display module DM.

[0065] The display module DM can display an image IM, sense external input, and detect the user's fingerprint. The display module DM may include a front surface IS with an active area AA and a peripheral area NAA. The active area AA can be an area activated by an electrical signal.

[0066] In some exemplary embodiments of the present invention, the effective region AA may be the region that displays the image IM and also detects (e.g., external input from a user). The transmission region TA may be at least superimposed on the effective region AA. For example, the transmission region TA may be completely or at least partially superimposed on the effective region AA. Thus, the user can identify the image IM through the transmission region TA or can provide external input through the transmission region TA. However, the present invention is not limited thereto. The effective region AA may be configured such that the region used to display the image IM is separated from the region used to detect external input.

[0067] The peripheral area NAA can be an area covered by the border area BZA. For example, the peripheral area NAA can be completely covered by the border area BZA, preventing external recognition. The peripheral area NAA can be adjacent to the active area AA. The peripheral area NAA can surround the active area AA. The peripheral area NAA can include multiple drive lines or multiple driver circuits to drive the active area AA.

[0068] The display device DD also includes a driver circuit module DC. The driver circuit module DC can be electrically connected to the display module DM. The driver circuit module DC may include a main circuit board MB and a flexible circuit board FCB.

[0069] The main circuit board MB may include a power connector or various driver circuits to drive the display module DM. A flexible circuit board FCB may be integrated with both the main circuit board MB and the display module DM. The driver circuit module DC may also include a driver chip DIC mounted on the flexible circuit board FCB. In some exemplary embodiments of the invention, the driver chip DIC may be directly mounted on the display module DM.

[0070] The housing HU can be combined with the window WP. The housing HU and window WP can be combined to provide internal space. The display module DM can be housed within the internal space. The housing HU can include materials with relatively high rigidity. For example, the housing HU can include one selected from glass, plastic, and metal, or can include multiple frames and / or multiple panels, each frame or panel including any combination of glass, plastic, and metal. When the components of the display device DD are housed within the internal space, the housing HU can stably protect these components from external impacts.

[0071] The display module DM and the housing HU can house a battery module or similar component to provide the power required for the overall operation of the display device DD.

[0072] Reference Figure 1B and Figure 2 According to some exemplary embodiments of the present invention, the display module DM may include a display unit DU and an input sensing unit TU.

[0073] The display unit DU can display images based on electrical signals, and the input sensing unit TU can detect external inputs applied from the outside. External inputs can include any suitable type of input applied from outside the display device DD. External inputs can be provided in various types. For example, external inputs can include not only touches from a user's hand or other body parts, but also any input that approaches or comes into contact with the display device DD before contact is made (e.g., hover touch). Furthermore, external inputs can include force, pressure, light, or any other external input.

[0074] The front surface IS of the display module DM can be divided into an effective area AA and a peripheral area NAA. The effective area AA can be the area displaying an image provided from the display module DM. According to this embodiment, a biometric information sensing area BSA can be included in the effective area AA. For example, the biometric information sensing area BSA can be located near the peripheral area NAA and can be surrounded by the effective area AA. The biometric information sensing area BSA can refer to the area that detects the user's biometric authentication information. In some exemplary embodiments of the present invention, the biometric information sensing area BSA can detect the user's fingerprint as biometric authentication information.

[0075] Reference Figure 2 The display unit DU may include a substrate layer BL, a display circuit layer CL, a display element layer ED, and a packaging layer TFE.

[0076] The substrate layer BL may include a synthetic resin layer. The synthetic resin layer may be formed on a workpiece substrate used to manufacture the display unit DU. Conductive and dielectric layers may be formed on the synthetic resin layer. When the workpiece substrate is removed, the synthetic resin layer may correspond to the substrate layer BL. The synthetic resin layer may be a polyimide resin layer, but the material of the synthetic resin layer is not limited to this. The substrate layer BL may include one or more of a glass substrate, a metal substrate, and an organic / inorganic composite substrate.

[0077] The display circuit layer CL can be disposed on the substrate layer BL. The display circuit layer CL may include at least one dielectric layer and circuit elements. Hereinafter, the dielectric layer included in the display circuit layer CL may be referred to as an intermediate dielectric layer. The intermediate dielectric layer may include at least one intermediate inorganic layer and at least one intermediate organic layer. The circuit elements may include signal lines, pixel driver circuits, etc. The display circuit layer CL can be formed by a formation process in which dielectric layers, semiconductor layers, and conductive layers are coated or deposited, and by a patterning process in which photolithography is used to pattern the dielectric layers, semiconductor layers, and conductive layers.

[0078] The display element layer (ED) can be stacked with the display circuit layer (CL). For example, the display element layer (ED) can directly contact the display circuit layer (CL). The display element layer (ED) may include organic light-emitting elements and pixel defining layers. (Refer to the following...) Figure 4A Further details will be discussed regarding the display element layer (ED).

[0079] The encapsulation layer TFE can encapsulate the display element layer ED. The encapsulation layer TFE may include at least one organic layer and at least one inorganic layer. The inorganic layer can protect the display element layer ED from moisture / oxygen or any other type of external environmental influence. The inorganic layer may include a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer, but exemplary embodiments of the present invention are not limited thereto.

[0080] Reference Figure 3 The display unit DU may include a driver circuit GDC, multiple signal lines SGL, and multiple pixels PX. The display unit DU may be disposed in the peripheral area NAA, and may also include a pixel pad (or "pad") part PLD, which includes pixel pads D-PD connected to the corresponding signal lines in the multiple signal lines SGL.

[0081] Pixels (PX) can be set within an effective area (AA). Each pixel (PX) may include an organic light-emitting element (OLED) and pixel driver circuitry connected to the OLED. Driver circuitry (GDC), signal line (SGL), pixel pad (PLD), and pixel driver circuitry may be included in... Figure 2 The display circuit layer CL is shown in the diagram.

[0082] The driver circuit GDC may include a gate driver circuit. The gate driver circuit can generate multiple gate signals and sequentially output these gate signals to multiple gate lines GL, which will be discussed below. The gate driver circuit can also output different control signals to the pixel driver circuit.

[0083] The signal line SGL can include gate lines GL, data lines DL, power lines PL, and control signal lines CSL. One gate line GL can be connected to a corresponding pixel PX, and one data line DL can be connected to a corresponding pixel PX. The power line PL can be connected to a pixel PX. The control signal line CSL provides control signals to the gate driver circuitry. The signal line SGL can be stacked with the active area AA and the peripheral area NAA.

[0084] The pixel pad PLD can be connected to the main circuit board MB (e.g.) Figure 1B(As shown in the diagram) the joined portion, and the pixel pad D-PD of the pixel pad portion PLD can be connected to the corresponding pad of the main circuit board MB. The portion of the connection line provided on the display circuit layer CL can be included in the dielectric layer of the display circuit layer CL for exposure, and the exposed portion can correspond to the pixel pad D-PD.

[0085] Pixel pads (D-PDs) can be connected to their corresponding pixels (PXs) via signal lines (SGL). Additionally, one pixel pad (D-PD) can be connected to the driver circuit (GDC).

[0086] Pixel PX can receive a gate signal from gate line GL and a data signal from data line DL. Pixel PX can also receive a first power voltage from power line PL. Pixel PX may include a thin-film transistor, a capacitor, and an organic light-emitting element.

[0087] Return to reference Figure 2 The input sensing unit TU can be directly disposed on the display unit DU. In some exemplary embodiments of the present invention, the input sensing unit TU can be directly placed on the encapsulation layer TFE. For example, the input sensing unit TU and the encapsulation layer TFE can be formed by a continuous process. The input sensing unit TU can be bonded to the encapsulation layer TFE by an adhesive member disposed on the encapsulation layer TFE, but the present invention is not limited thereto.

[0088] The input sensing unit TU may include sensing electrodes, each of which includes a sensing pattern and a sensing line. Both the sensing electrodes and the sensing lines may have a single-layer structure or a multi-layer structure.

[0089] The display module DM according to some exemplary embodiments of the present invention may further include a biometric information sensing unit BSU. The biometric information sensing unit BSU may be disposed on the bottom surface of the display unit DU, corresponding to the biometric information sensing area BSA. In other words, the biometric information sensing unit BSU may be formed within the biometric information sensing area BSA. In this description, the biometric information sensing area BSA is shown as part of the display module DM, but the biometric information sensing area BSA may extend throughout the entire display module DM. For example, in Figure 2 In this process, the width of the biometric information sensing area BSA in the second direction DR2 can be the same as the width of the display module DM.

[0090] In some exemplary embodiments of the present invention, the biometric information sensing unit (BSU) may include a substrate (BS), a sensing layer (SL) disposed on the substrate (BS), and an optical system (OS) disposed on the sensing layer (SL). The sensing layer (SL) may include an identification sensor for identifying a user's biometric authentication information (e.g., fingerprint) and a pressure detection sensor for detecting pressure applied externally by the user. In some exemplary embodiments of the present invention, the identification sensor may be a fingerprint sensor for sensing a user's fingerprint, a blood sensor for detecting blood flow, a pulse sensor for measuring heart rate, etc. As described above, the biometric information sensing unit (BSU) may include an optical system (OS), but the present invention is not limited thereto. For example, the biometric information sensing unit (BSU) may include an ultrasonic transceiver and can therefore be used as an ultrasonic sensor in which fingerprints are detected using ultrasonic methods.

[0091] Figure 4A An enlarged cross-sectional view of a biometric information sensing unit (BSU) according to some exemplary embodiments of the present invention is shown. Figure 4B A plan view is shown illustrating a light detection sensor and a pressure detection sensor according to some exemplary embodiments of the present invention. Figure 4C A plan view illustrating the arrangement of an optical system, a light detection sensor, and a pressure detection sensor according to some exemplary embodiments of the present invention is shown. Figure 4A In the following embodiments shown, with Figure 2 The same components shown are assigned the same reference numerals, and their detailed descriptions will be omitted.

[0092] Reference Figure 4A The display unit DU may include a substrate layer BL on which a display circuit layer CL, a display element layer ED, and a packaging layer TFE are disposed. The display unit DU may also include functional layers such as an anti-reflective layer and a refractive index adjustment layer.

[0093] The display element layer ED may include a pixel defining layer PDL and an organic light-emitting diode (OLED). The pixel defining layer PDL may include an organic material. A first electrode AE ​​may be disposed on the display circuit layer CL. The pixel defining layer PDL may be formed on the first electrode AE. An opening may be disposed in the pixel defining layer PDL. The opening in the pixel defining layer PDL may expose at least a portion of the first electrode AE. In some exemplary embodiments of the present invention, the pixel defining layer PDL may be omitted.

[0094] An emission layer EML can be disposed in the region corresponding to the opening. For example, an emission layer EML can be formed in each of the pixels PX. The emission layer EML can include organic and / or inorganic materials. The emission layer EML can produce light of a certain color. For example, the emission layer EML can produce red light, green light, blue light, or any combination thereof.

[0095] In some exemplary embodiments of the present invention, the emitter layer EML is patterned for each pixel PX, but the present invention is not limited thereto. A second electrode CE may be disposed on the emitter layer EML. The second electrode CE may be commonly placed on the pixel PX. An encapsulation layer TFE may be disposed on the second electrode CE.

[0096] The biometric information sensing unit (BSU) can be positioned below the display unit (DU) and receive light output from the display unit (DU) to identify biometric authentication information. For example, the biometric information sensing unit (BSU) can receive light reflected from a user's finger to identify his or her biometric information.

[0097] More specifically, when the display unit DU is operating, the emitting layer EML of the display unit DU can emit light including image data, and the output light can be displayed as an image on the display surface DS. When a user's finger touches the display surface DS, light can be reflected from the finger and then provided to the biometric information sensing unit BSU located below the display unit DU.

[0098] When a user's fingerprint (FP) touches the display surface (DS), there may be an intensity difference between the reflected light from the ridges (RP) and valleys (VP) of the fingerprint (FP). The biometric sensing unit (BSU) can use this difference to identify the fingerprint (FP).

[0099] The biometric information sensing unit (BSU) may include a substrate (BS), a sensing layer (SL), and an optical system (OS), and the sensing layer (SL) may include a light detection sensor (LS) and a pressure detection sensor (FS).

[0100] The optical system OS may include a transmissive portion TP that is transparent to light incident on the biometric information sensing unit BSU, and may also include an absorber portion AP disposed around the transmissive portion TP and absorbing light. The optical system OS may include a collimator layer to allow the light detection sensor LS to converge light reflected from a finger. The collimator layer may have a structure in which multiple openings or slits are formed, for example, the multiple openings or slits may transmit light only at their angles of incidence within a certain range. The angle range may vary based on the width of each of the multiple openings or slits. Here, the multiple openings or slits may be referred to as the transmissive portion TP of the optical system OS. For example, the transmissive portion TP may be a pinhole.

[0101] The absorbing portion AP may have the property of absorbing light. The absorbing portion AP may be a colored layer. For example, the absorbing portion AP may include a material in which light-absorbing particles are distributed. Additionally or alternatively, the absorbing portion AP may be a layer in which carbon-based pigments are mixed.

[0102] The light detection sensor LS can be positioned below the transmission section TP of the optical system OS, and can receive light passing through the transmission section TP. For example, the optical system OS can prevent the light detection sensor LS from receiving light other than light incident after reflection from the user's finger.

[0103] In some exemplary embodiments of the present invention, the pressure detection sensor FS may be disposed below the absorber AP of the optical system OS. Therefore, externally applied pressure can be transmitted to the pressure detection sensor FS through the absorber AP.

[0104] Reference Figure 4B and Figure 4C The substrate BS of the biometric information sensing unit (BSU) may include a sensing region (SA) and a non-sensing region (NSA). The non-sensing region (NSA) may be configured to surround the sensing region (SA). A sensing layer SL may be disposed within the sensing region (SA) of the substrate BS. The sensing layer SL may include a light detection sensor (LS) and a pressure detection sensor (FS). The light detection sensor (LS) and the pressure detection sensor (FS) may be disposed within the sensing region (SA).

[0105] The sensing area SA may include multiple sensing areas arranged in a matrix shape, and each of the multiple sensing areas may include an effective sensing area ASA and an ineffective sensing area NASA. A light detection sensor LS may be disposed in the effective sensing area ASA, and a pressure detection sensor FS may be disposed in the ineffective sensing area NASA. The effective sensing area ASA may be superimposed on the transmissive portion TP of the optical system OS. For example, the transmissive portion TP of the optical system OS may be positioned within the effective sensing area ASA.

[0106] In some exemplary embodiments of the present invention, the light detection sensor LS may include a plurality of phototransistors arranged in a matrix shape in a sensing region SA. The region where the plurality of phototransistors are disposed may be defined as an indication of an effective sensing region ASA. The plurality of phototransistors may receive light provided from the transmission section TP and may output a current corresponding to the intensity of the incident light.

[0107] The pressure sensing sensor FS may include multiple strain sensing patterns FSP disposed in the ineffective sensing area of ​​NASA and a connecting pattern CP connecting the multiple strain sensing patterns FSP to each other. Each of the multiple strain sensing patterns FSP may include a strain gauge.

[0108] like Figure 4BAs shown, the pressure sensing sensor FS may include two pressure sensing strings. The two pressure sensing strings may be arranged adjacent to each other in a first direction DR1. Each of the pressure sensing strings may include multiple strain detection patterns FSP and connection patterns CP. However, the invention is not limited thereto. For example, the pressure sensing sensor FS may include at least one pressure sensing string, or three or more pressure sensing strings. The pressure sensing strings may have the same structure. The pressure sensing strings may be arranged in a row in a second direction DR2.

[0109] The pressure sensing sensor FS can be configured to be spaced apart from the light sensing sensor LS. For example, columns of pressure sensing sensors FS can be formed between columns of adjacent light sensing sensors LS. Additionally, multiple strain detection patterns FSP and connecting patterns CP may not be stacked with phototransistors. Multiple strain detection patterns FSP can be stacked with the absorber AP.

[0110] Each of the multiple strain detection patterns (FSPs) can be rhomboid in shape. An empty space can be formed in the central region of the rhomboid shape. However, the shape of the multiple strain detection patterns (FSPs) is not limited to this. For example, each of the multiple strain detection patterns (FSPs) can be circular, quadrilateral, elliptical, etc.

[0111] Multiple strain detection patterns (FSPs) can be arranged spaced apart from each other on the second direction DR2 and can be connected to each other by connecting patterns (CPs).

[0112] The pressure sensing sensor FS may also include a first voltage line VL1 connected to one end of each pressure sensing string, a second voltage line VL2 connected to the other end of each pressure sensing string, a first strain line SNL connected to the input end of each pressure sensing string, and a second strain line SPL connected to the output end of each pressure sensing string.

[0113] The first voltage line VL1 can be supplied with a driver voltage, and the second voltage line VL2 can be supplied with a ground voltage. The first strain gauge SNL can be input with a driver signal, and the second strain gauge SPL can output the resistance difference measured by pressure.

[0114] Pads VPD1, VPD2, SND, and SPD can be disposed in the non-sensing region NSA of the substrate BS. Pads VPD1, VPD2, SND, and SPD may include a first voltage pad VPD1, a second voltage pad VPD2, a first strain pad SND, and a second strain pad SPD. In some exemplary embodiments of the present invention, the first voltage pad VPD1 may be connected to a first voltage line VL1, and the second voltage pad VPD2 may be connected to a second voltage line VL2. The first strain pad SND may be connected to a first strain line SNL, and the second strain pad SPD may be connected to a second strain line SPL.

[0115] Therefore, the pressure sensor FS can be supplied with driver voltage, ground voltage and driver signal from the outside, and can output the resistance difference measured by pressure.

[0116] When the pressure sensor FS detects the resistance difference measured by the pressure, the biometric information sensing unit BSU can detect the user's touch event to activate the optical sensor LS for fingerprint recognition.

[0117] Because the biometric sensing unit (BSU) includes both a light detection sensor (LS) and a pressure detection sensor (FS), the BSU can detect user touch events and reduce the time required to activate the light detection sensor (LS). For example, since the pressure detection sensor (FS) is located together with the light detection sensor (LS), the standby time of the light detection sensor (LS) can be reduced.

[0118] Figure 4D A plan view is shown illustrating a light detection sensor and a pressure detection sensor according to some exemplary embodiments of the present invention.

[0119] Reference Figure 4D The pressure sensing sensor FS may include two pressure sensing strings (also referred to as the first pressure sensing string and the second pressure sensing string) arranged adjacent to each other in the first direction DR1. The first pressure sensing string and the second pressure sensing string may be connected to common pads VPD1, VPD2, SND, and SPD. Common pads VPD1, VPD2, SND, and SPD may be disposed in the non-sensing region NSA of the substrate BS. Common pads VPD1, VPD2, SND, and SPD may include a first voltage pad VPD1, a second voltage pad VPD2, a first strain pad SND, and a second strain pad SPD.

[0120] The first voltage pad VPD1 can be connected to the first voltage line VL1 of the first pressure detection string, and the second voltage pad VPD2 can be connected to the second voltage line VL2 of the first pressure detection string. The first voltage line VL1 of the first pressure detection string can be connected to the second pressure detection string via a first connecting line CCL1. The second voltage line VL2 of the first pressure detection string can be connected to the second pressure detection string via a second connecting line CCL2. Therefore, the first pressure detection string and the second pressure detection string can share a first voltage pad VPD1 and can also share a second voltage pad VPD2.

[0121] The first strain gauge SND can be connected to the first strain line SNL, and the second strain gauge SPD can be connected to the second strain line SPL. The first strain line SNL of the first pressure sensing string can be connected to the second pressure sensing string via a third connecting line CCL3. The second strain line SPL of the first pressure sensing string can be connected to the second pressure sensing string via a fourth connecting line CCL4. Therefore, the first and second pressure sensing strings can share a first strain gauge SND and can also share a second strain gauge SPD.

[0122] Figure 5A A plan view illustrating the arrangement of an optical system, a light detection sensor, and a pressure detection sensor according to some exemplary embodiments of the present invention is shown. Figure 5B It shows Figure 5A A magnified planar view of the unit sensing area. Figure 5C It shows along Figure 5A A sectional view taken by line I-I'. Figure 5D It shows Figure 5C A perspective view of one of the multiple optical fibers shown. Figure 5E It shows Figure 5D The image shows a partially exploded perspective view of the optical fiber. Figure 5A In the following embodiments shown, with Figure 4C The same components shown are assigned the same reference numerals, and their detailed descriptions will be omitted.

[0123] Reference Figures 5A to 5E The sensing area SA can include multiple unit sensing areas USA, and each of the multiple unit sensing areas USA can include a valid sensing area ASA and an invalid sensing area NASA (e.g., Figure 5B (as shown in the image).

[0124] An optical system OS according to some exemplary embodiments of the present invention may include a plurality of optical fibers LF. The plurality of optical fibers LF may be arranged in a matrix shape along a first direction DR1 and a second direction DR2. In some exemplary embodiments, the plurality of optical fibers LF may correspond to a plurality of unit sensing regions USA. For example, one optical fiber LF may be disposed in one unit sensing region USA.

[0125] The light detection sensor LS can be located in the effective sensing area ASA, and the pressure detection sensor FS can be located in the ineffective sensing area NASA. In other words, the light detection sensor LS can be located in the effective sensing area ASA of each unit sensing area USA, and the pressure detection sensor FS can be located in the ineffective sensing area NASA of at least some of the unit sensing areas USA.

[0126] In some exemplary embodiments of the present invention, the unit sensing region USA may have a quadrilateral shape, and the light detection sensor LS may be positioned adjacent to one of the four corners of the unit sensing region USA. For example, the center of the unit sensing region USA may be located at a different position than the center of the light detection sensor LS.

[0127] Each of the multiple optical fibers (LFs) may include a core COP and a cladding CDP configured to surround the core COP. The core COP can serve as a transmissive portion for transmitting light incident from the display unit (DU) (see...). Figure 4A The TP), and the CDP covering portion can be used as an absorber to absorb incident light (see TP). Figure 4A AP).

[0128] The core COP may include an upper portion UP having a first diameter d1 and a lower portion LP having a second diameter d2 smaller than the first diameter d1. The lower portion LP may be the portion closer to the light detection sensor LS than the upper portion UP.

[0129] The upper portion (UP) can be configured to overlap with the effective sensing area (ASA) and ineffective sensing area (NASA) of the unit sensing area (USA). For example, because the first diameter d1 of the upper portion UP is formed to be larger than the second diameter d2 of the lower portion LP, the efficiency of providing light incident from the display unit (DU) to the core (COP) can be increased. The first diameter d1 of the upper portion UP can decrease as it approaches the lower portion LP. Therefore, when each fiber LF is cut along the third direction DR3, the upper portion UP can have a funnel-shaped profile.

[0130] The lower LP can be positioned within the effective sensing area ASA, thus superimposed on the photodetector LS. The lower LP can guide light incident through the upper UP to the photodetector LS. The lower LP can be positioned adjacent to one of the four corners of the unit sensing area USA. Therefore, when each fiber LF is cut along the third direction DR3, the upper UP can have an asymmetric funnel-shaped profile.

[0131] The pressure sensor FS can be placed in a non-sensing area of ​​NASA. In a non-sensing area of ​​NASA, the pressure sensor FS can be stacked with the cover plate CDP. For example, the pressure sensor FS can be placed below the cover plate CDP. Therefore, externally applied pressure can be transmitted to the pressure sensor FS through the cover plate CDP.

[0132] The pressure sensor FS can have the same characteristics as Figure 4B The pressure sensor FS shown has the same structure. Therefore, it will be omitted to avoid repetitive description of the pressure sensor FS.

[0133] Because the biometric sensing unit (BSU) includes both a light detection sensor (LS) and a pressure detection sensor (FS) for activating the LS, the BSU can detect user touch events and reduce the time required to activate the LS. For example, because the pressure detection sensor (FS) is integrated with the LS, the standby time of the LS can be reduced.

[0134] Figure 6A A plan view is shown illustrating a light detection sensor and a pressure detection sensor according to some exemplary embodiments of the present invention. Figure 6B A plan view illustrating the arrangement of an optical system, a light detection sensor, and a pressure detection sensor according to some exemplary embodiments of the present invention is shown. Figure 6C It shows Figure 6B A magnified planar view of the unit sensing area depicted in the image. Figure 6D It shows along Figure 6B The sectional view taken from line II-II'.

[0135] Reference Figures 6A to 6D The substrate BS of the biometric information sensing unit (BSU) may include a sensing region (SA) and a non-sensing region (NSA). The non-sensing region (NSA) may be configured to surround the sensing region (SA).

[0136] like Figures 6A to 6D As shown, the sensing area SA may include multiple unit sensing areas USA, and each of the multiple unit sensing areas USA may include multiple effective sensing areas ASA1 to ASA4 (hereinafter referred to as the first effective sensing area to the fourth effective sensing area) and an ineffective sensing area NASA. The multiple unit sensing areas USA may be arranged in a matrix shape along the first direction DR1 and the second direction DR2.

[0137] In some exemplary embodiments of the present invention, each unit sensing area USA may have a quadrilateral shape and may have four light detection sensors LS1, LS2, LS3, and LS4 (hereinafter referred to as the first light detection sensor, the second light detection sensor, the third light detection sensor, and the fourth light detection sensor) disposed thereon. For example, the first light detection sensor LS1, the second light detection sensor LS2, the third light detection sensor LS3, and the fourth light detection sensor LS4 may be correspondingly arranged adjacent to the four corners of each unit sensing area USA. In this case, the first effective sensing area ASA1 to the fourth effective sensing area ASA4 may be located at the four corners of each unit sensing area USA where the first light detection sensor LS1 to the fourth light detection sensor LS4 are disposed.

[0138] like Figure 6B and Figure 6D As shown, the optical system OS may include multiple optical fibers. For example, the optical system OS may include multiple optical fibers configured to correspond to each unit sensing region USA. In some exemplary embodiments of the present invention, each unit sensing region USA may have four optical fibers LF1, LF2, LF3, and LF4 (hereinafter referred to as the first optical fiber, the second optical fiber, the third optical fiber, and the fourth optical fiber). The first optical fiber LF1 may be configured to be superimposed with a first optical detection sensor LS1, the second optical fiber LF2 may be configured to be superimposed with a second optical detection sensor LS2, the third optical fiber LF3 may be superimposed with a third optical detection sensor LS3, and the fourth optical fiber LF4 may be superimposed with a fourth optical detection sensor LS4.

[0139] Each of the first optical fibers LF1 to the fourth optical fiber LF4 may include a core COP and a cladding CDP configured to surround the core COP. The core COP can serve as a transmissive portion for transmitting light incident from the display unit DU (see...). Figure 4A The TP), and the CDP covering portion can be used as an absorber to absorb incident light (see TP). Figure 4A AP).

[0140] The core COP may include a first diameter (see Figure 5E The upper part UP of d1) and the second diameter having a smaller diameter than the first diameter d1 (see Figure 5E The lower part LP of d2). The lower part LP can be considered as a part that is closer to one of the corresponding light detection sensors LS1 to LS4 than the upper part UP.

[0141] The lower portion LP of each of the first optical fiber LF1 to the fourth optical fiber LF4 can be configured to correspond to one of the first effective sensing regions ASA1 to the fourth effective sensing regions ASA4. For example, the lower portion LP of each of the first optical fiber LF1 to the fourth optical fiber LF4 can be superimposed with one of the first optical detection sensors LS1 to the fourth optical detection sensors LS4.

[0142] The upper portion (UP) of each of the first optical fibers LF1 to the fourth optical fibers LF4 can be superimposed with a corresponding one of the first effective sensing regions ASA1 to the fourth effective sensing regions ASA4, and can also be superimposed with the ineffective sensing region NASA of the unit sensing region USA. For example, the first diameter d1 of the upper portion UP can be larger than the second diameter d2 of the lower portion LP. Therefore, light incident from the display unit DU can be effectively supplied to the core COP through the upper portion UP with its larger diameter. The first diameter d1 of the upper portion UP can decrease as it approaches the lower portion LP. Therefore, when each of the first optical fibers LF1 to the fourth optical fibers LF4 is cut along the third direction DR3, the upper portion UP can have a funnel-shaped profile.

[0143] The lower portion LP of each of the first optical fibers LF1 to the fourth optical fibers LF4 can guide light incident through the upper portion UP to a corresponding one of the first optical detection sensors LS1 to the fourth optical detection sensors LS4. The lower portion LP of each of the first optical fibers LF1 to the fourth optical fibers LF4 can be configured to be adjacent to one of the four corners of the unit sensing region USA. Therefore, when each of the first optical fibers LF1 to the fourth optical fibers LF4 is cut along its longitudinal direction, the upper portion UP can have an asymmetrical funnel-shaped profile.

[0144] The invalid sensing area NASA can be the area that includes the center of each unit sensing area USA, and the pressure detection sensor FS can be set in the invalid sensing area NASA.

[0145] The pressure sensing sensor FS can include multiple strain detection patterns FSP disposed in the ineffective sensing area of ​​NASA and a connecting pattern CP connecting the multiple strain detection patterns FSP to each other. For example... Figure 6A As shown, the pressure sensing sensor FS may include a pressure sensing string. The pressure sensing string may include multiple strain sensing patterns FSP and connection patterns CP. However, the invention is not limited thereto. For example, the pressure sensing sensor FS may include two or more pressure sensing strings. The pressure sensing strings may have the same structure.

[0146] The pressure sensing sensor FS can be configured to be spaced apart from the optical sensing sensors LS1 to LS4. For example, multiple strain sensing patterns FSP and connection patterns CP can be separate from the first optical sensing sensors LS1 to the fourth optical sensing sensors LS4 in the corresponding unit sensing area USA. In the inactive sensing area NASA, the strain sensing patterns FSP can be superimposed on the cladding CDP of each of the first optical fibers LF1 to the fourth optical fibers LF4. For example, multiple strain sensing patterns FSP can be positioned below the cladding CDP of the first optical fibers LF1 to the fourth optical fibers LF4. Therefore, externally applied pressure can be transmitted to the multiple strain sensing patterns FSP through the cladding CDP of the first optical fibers LF1 to the fourth optical fibers LF4.

[0147] Each of the multiple strain detection patterns (FSPs) can have a rhombus shape, with an empty space formed therein in the central region of the rhombus shape. However, the shape of the multiple strain detection patterns (FSPs) is not limited to this. For example, each of the multiple strain detection patterns (FSPs) can have a circular shape, a quadrilateral shape, an elliptical shape, etc.

[0148] In some exemplary embodiments of the present invention, the central region of the rhombus shape may have at least one dummy pattern DSP whose size is smaller than that of the strain detection pattern FSP. The at least one dummy pattern DSP may have the same rhombus shape as the strain detection pattern FSP. The dummy pattern DSP may be electrically connected to or separate from the strain detection pattern FSP.

[0149] Multiple strain detection patterns (FSPs) can be spaced apart from each other in the second direction (DR2) and can be connected to each other by connecting patterns (CPs).

[0150] The pressure sensing sensor FS may also include a first voltage line VL1 connected to one end of the pressure sensing string, a second voltage line VL2 connected to the other end of the pressure sensing string, a first strain line SNL connected to the input end of the pressure sensing string, and a second strain line SPL connected to the output end of the pressure sensing string.

[0151] The first voltage line VL1 can be supplied with the driver voltage, and the second voltage line VL2 can be supplied with the ground voltage. The first strain gauge line SNL can receive the driver signal, and the second strain gauge line SPL can output the resistance difference measured by pressure.

[0152] The non-sensing region (NSA) of the substrate BS may include a first voltage pad VPD1, a second voltage pad VPD2, a first strain pad SND, and a second strain pad SPD. The first voltage pad VPD1 may be connected to a first voltage line VL1, and the second voltage pad VPD2 may be connected to a second voltage line VL2. The first strain pad SND may be connected to a first strain line SNL, and the second strain pad SPD may be connected to a second strain line SPL.

[0153] Therefore, the pressure sensor FS can be supplied with driver voltage, ground voltage and driver signal from the outside, and can output the resistance difference measured by pressure.

[0154] For example, according to Figure 6B The pressure sensing sensor FS of the embodiment shown may include a structure having a ratio Figure 5A The strain detection pattern FSP shown is a large-sized strain detection pattern FSP. Therefore, Figure 6B The pressure sensor FS can have improved sensitivity. The biometric information sensing unit BSU can effectively detect the occurrence of user touch events, and thus reduce the time required to activate the light detection sensors LS1 to LS4. As a result, the standby time of the light detection sensors LS1 to LS4 can be reduced.

[0155] Figure 7A An enlarged cross-sectional view of a biometric information sensing unit illustrating some exemplary embodiments of the present invention is shown. Figure 7B A plan view is shown illustrating a light detection sensor and a pressure detection sensor according to some exemplary embodiments of the present invention. Figure 7C A plan view illustrating the arrangement of an optical system, a light detection sensor, and a pressure detection sensor according to some exemplary embodiments of the present invention is shown. Figure 7A In the following embodiments shown, with Figure 4A The same components shown are assigned the same reference numerals or symbols, so repeated descriptions will be omitted.

[0156] Reference Figures 7A to 7C The biometric information sensing unit (BSU) may include a substrate (BS), a sensing layer (SL), an optical system (OS), and a cushion layer (CHL).

[0157] The substrate BS may include a sensing region SA and a non-sensing region NSA. The non-sensing region NSA may be configured to surround the sensing region SA. The sensing region SA may include multiple unit sensing regions USA arranged in a matrix shape. A sensing layer SL may be disposed within the sensing region SA of the substrate BS. The sensing layer SL may include multiple light detection sensors LS and pressure detection sensors FS. The multiple light detection sensors LS may be correspondingly disposed within the multiple unit sensing regions USA.

[0158] The optical system (OS) can include multiple optical fiber LFs. The optical fiber LFs can be transparent to light incident on the biometric information sensing unit (BSU).

[0159] A light detection sensor LS can be disposed within a sensing region SA of a substrate BS. Within the sensing region SA, the light detection sensor LS can be correspondingly positioned beneath multiple optical fibers LF and can receive light passing through the optical fibers LF. For example, the optical fibers LF can prevent the light detection sensor LS from receiving light other than light incident after reflection from the user's finger.

[0160] Each optical detection sensor LS may include a phototransistor. The phototransistor can receive light supplied through the optical fiber LF and can output a current corresponding to the intensity of the incident light.

[0161] The pressure sensor FS can be disposed in the non-sensing area (NSA) of the substrate BS. The pressure sensor FS may include multiple strain detection patterns (FSPs) disposed in the NSA. Because the pressure sensor FS is disposed in the NSA, it is compatible with… Figures 4A to 6D Compared to the embodiment shown where the pressure detection sensor FS is disposed in the sensing area SA, each optical detection sensor LS can have a larger size. Therefore, each optical detection sensor LS can improve its capacity and sensitivity in recognizing biometric information (such as fingerprint recognition).

[0162] The cushioning layer CHL can be disposed on the pressure sensing sensor FS and can transmit externally applied pressure to the pressure sensing sensor FS. The cushioning layer CHL may include a material capable of absorbing external pressure supplied from the outside. In some exemplary embodiments of the present invention, the cushioning layer CHL may include an organic dielectric material.

[0163] Each strain gauge pattern (FSP) can extend along the second direction DR2. Each strain gauge pattern (FSP) can include metallic material. Each strain gauge pattern (FSP) can have a structure that bends several times.

[0164] In some exemplary embodiments of the present invention, the pressure sensing sensor FS may include a pressure sensing string having a plurality of strain sensing patterns FSP. The pressure sensing sensor FS may also include a first voltage line VL1 connected to one end of the pressure sensing string, a second voltage line VL2 connected to the other end of the pressure sensing string, a first strain pad SND, and a second strain pad SPD.

[0165] The first voltage line VL1 can supply the driver voltage, and the second voltage line VL2 can supply the ground voltage. The first strain gauge SND can receive a driver signal, and the second strain gauge SPD can output the resistance difference measured by pressure.

[0166] Pads VPD1 and VPD2 can be disposed in the non-sensing area (NSA) of the substrate BS. Pads VPD1 and VPD2 can include a first voltage pad VPD1 and a second voltage pad VPD2. The first voltage pad VPD1 can be connected to a first voltage line VL1, and the second voltage pad VPD2 can be connected to a second voltage line VL2.

[0167] Therefore, the pressure sensor FS can be supplied with driver voltage, ground voltage and driver signal from the outside, and can output the resistance difference measured by pressure.

[0168] The biometric information sensing unit (BSU) can be configured such that the pressure detection sensor (FS) is placed in the non-sensing area (NSA) without affecting the size of the light detection sensor (LS), and thus the standby time of the light detection sensor (LS) can be reduced while maintaining excellent fingerprint recognition.

[0169] In a display device according to an exemplary embodiment of the present invention, a biometric information sensing unit for biometric information identification may together include a light detection sensor and a pressure detection sensor for activating the operation of the light detection sensor, thereby reducing the standby time when the light detection sensor is activated.

[0170] Although the invention has been described with reference to exemplary embodiments thereof, it will be understood that various changes and modifications may be made to the invention by those skilled in the art without departing from the spirit and scope of the invention as set forth in the appended claims.

Claims

1. A display apparatus comprising: a display unit including a light emitting element that emits light; and a biometric information sensing unit disposed below the display unit, wherein the biometric information sensing unit receives light reflected by a biometric input, wherein the biometric information sensing unit includes: an optical system including a transmission portion through which the reflected light passes and an absorption portion around the transmission portion, wherein the absorption portion absorbs the reflected light and pressure; a light detection sensor disposed below the transmission portion of the optical system, wherein the light detection sensor receives the reflected light that passes through the transmission portion; and a pressure detection sensor disposed below the absorption portion of the optical system, wherein the pressure detection sensor detects the pressure transmitted from the absorption portion.

2. The display device according to claim 1, wherein The biometric information sensing unit further includes a base substrate including a sensing region and a non-sensing region surrounding the sensing region.

3. The display device according to claim 2, wherein The light detection sensor and the pressure detection sensor are disposed in the sensing region of the base substrate.

4. The display device according to claim 3, wherein The sensing region includes an active sensing region and an inactive sensing region, wherein the light detection sensor is disposed in the active sensing region, and wherein the pressure detection sensor is disposed in the inactive sensing region.

5. The display device of claim 4, wherein, The pressure detection sensor includes a pressure detection string.

6. The display device of claim 5, wherein, The pressure detection string includes: a plurality of strain detection patterns in the inactive sensing region; and a connection pattern connecting the plurality of strain detection patterns to each other.

7. The display device according to claim 3, wherein The sensing region includes a plurality of unit sensing regions arranged in a matrix shape, wherein the light detection sensor is disposed in each of the plurality of unit sensing regions.

8. The display device of claim 7, wherein, The optical system includes a plurality of optical fibers arranged in a matrix shape, wherein the plurality of optical fibers respectively correspond to the plurality of unit sensing regions.

9. The display device of claim 8, wherein, Each of the plurality of optical fibers includes: a core portion serving as the transmission portion; and a cladding portion surrounding the core portion and serving as the absorption portion.

10. The display device of claim 9, wherein, The core portion includes: a lower portion having a first diameter; and an upper portion having a second diameter greater than the first diameter, wherein the lower portion is closer to the light detection sensor than the upper portion.

11. The display device of claim 10, wherein, The second diameter of the upper portion decreases as the upper portion approaches the lower portion.

12. The display device according to claim 3, wherein The sensing region includes a plurality of unit sensing regions arranged in a matrix shape, wherein each of the plurality of unit sensing regions includes a plurality of active sensing regions and an inactive sensing region adjacent to the plurality of active sensing regions. 13.The display apparatus of claim 12, wherein: the light detection sensor includes a plurality of light detection sensors disposed in the plurality of active sensing regions, respectively, and the pressure detection sensor is disposed in the inactive sensing region. 14.The display apparatus of claim 13, wherein: each of the plurality of unit sensing regions has a quadrilateral shape, and the plurality of active sensing regions are located at corners of each unit sensing region.

15. The display device of claim 13, wherein, The optical system includes a plurality of optical fibers respectively corresponding to the plurality of light detection sensors.

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