Display device

Abstract

A display device is provided. The display device includes a first area comprising a plurality of first pixels, a second area disposed adjacent to the first area and comprising a plurality of second pixels, a first light sensor disposed adjacent to the plurality of first pixels in the first area and detecting light, and a second light sensor disposed adjacent to the plurality of second pixels in the second area and detecting light, wherein the area of ​​the second light sensor is different from the area of ​​the first light sensor.

Description

Technology Field

[0001] The present invention relates to a display device. Background Technology

[0002] As the information society develops, the demand for display devices to display images is increasing in various forms. For example, display devices are being applied to a wide range of electronic devices, such as smartphones, digital cameras, laptop computers, navigation systems, and smart televisions. Display devices may be flat panel displays, such as Liquid Crystal Display Devices, Field Emission Display Devices, and Organic Light Emitting Display Devices.

[0003] Since personal information is stored in portable electronic devices, fingerprint authentication is used to authenticate the user's biometric information, specifically their fingerprints, in order to protect the personal information of the portable electronic device. For example, a display device can authenticate a user's fingerprint using optical, ultrasonic, or capacitive methods. The optical method can authenticate a user's fingerprint by detecting light reflected from the user's fingerprint. To authenticate a user's fingerprint using the optical method, the display device may be equipped with a display panel that includes pixels for displaying an image and light sensors for detecting light.

[0004] In addition, with the healthcare industry gaining prominence recently, methods for acquiring biometric information regarding health more conveniently are being developed. For example, an optical blood pressure measuring device may also be equipped with a display panel comprising pixels for displaying an image, a pressure sensor for measuring pressure, and light sensors for detecting light, in order to measure a user's blood pressure. The problem to be solved

[0005] The problem that the present invention aims to solve is to provide a display device capable of both fingerprint detection and blood pressure measurement.

[0006] The problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0007] A display device according to one embodiment for solving the above problem comprises a first area including a plurality of first pixels, a second area including a plurality of second pixels disposed adjacent to the first area, a first light sensor disposed adjacent to the plurality of first pixels in the first area and detecting light, and a second light sensor disposed adjacent to the plurality of second pixels in the second area and detecting light, wherein the area of ​​the second light sensor is different from the area of ​​the first light sensor.

[0008] The area of ​​the second light sensor may be larger than the area of ​​the first light sensor.

[0009] The area of ​​the second optical sensor may be at least 1.5 times the area of ​​the first optical sensor.

[0010] Each of the plurality of first pixels includes a first subpixel emitting a first color, a second subpixel emitting a second color disposed adjacent to the first subpixel in a first direction and emitting a second color, a third subpixel emitting a third color disposed adjacent to the second subpixel in a second direction intersecting the first direction and emitting a third color, and a fourth subpixel emitting the second color disposed adjacent to the second subpixel in the second direction and adjacent to the third subpixel in the first direction and emitting the second color, and the first light sensor may be disposed adjacent to the first subpixel in a first diagonal direction intersecting the first direction and the second direction.

[0011] Each of the plurality of second pixels comprises a first subpixel emitting a first color, a second subpixel emitting a second color disposed adjacent to the first subpixel in a first direction, a third subpixel emitting a third color disposed adjacent to the second subpixel in a second direction intersecting the first direction, and a fourth subpixel emitting the second color disposed adjacent to the second subpixel in the second direction and disposed adjacent to the third subpixel in the first direction, and the second light sensor may be disposed adjacent to the first subpixel in the first diagonal direction.

[0012] Each of the plurality of first pixels and the plurality of second pixels may include a first subpixel, a second subpixel, a third subpixel, and a fourth subpixel.

[0013] The first subpixel emits red light as its first color, the second subpixel and the fourth subpixel emit green light as their second color, and the third subpixel emits blue light as its third color.

[0014] The first subpixel and the third subpixel are arranged alternately in a first direction, the second subpixel and the fourth subpixel are arranged alternately in the first direction, the first subpixel and the second subpixel are arranged alternately in a second direction intersecting the first direction, and the maximum brightness of any one of the plurality of second pixels may be greater than the maximum brightness of any one of the plurality of first pixels.

[0015] The maximum brightness of any one of the plurality of second pixels may be 1.5 times or more and 3 times or less the maximum brightness of any one of the plurality of first pixels.

[0016] The area of ​​a first subpixel of any one of the plurality of second pixels may be larger than the area of ​​a first subpixel of any one of the plurality of first pixels.

[0017] The thickness of the light-emitting layer of the first subpixel of any one of the plurality of second pixels may be greater than the thickness of the light-emitting layer of the first subpixel of any one of the plurality of first pixels.

[0018] The light-emitting layer of a first subpixel of any one of the plurality of second pixels comprises a first light-emitting material, and the light-emitting layer of a first subpixel of any one of the plurality of first pixels comprises a second light-emitting material, wherein the first light-emitting material may have a higher light-emitting efficiency than the second light-emitting material.

[0019] The second light-emitting material may have higher color reproducibility than the first light-emitting material.

[0020] The above second region may be surrounded by the above first region.

[0021] Each of the plurality of second pixels includes a first subpixel emitting a first color, a second subpixel emitting a second color disposed adjacent to the first subpixel in a first direction, and a third subpixel emitting a third color disposed adjacent to the second subpixel in a second direction intersecting the first direction, and the second light sensor may be disposed adjacent to the second subpixel in the second direction and adjacent to the third subpixel in the first direction.

[0022] The maximum brightness of any one of the plurality of second pixels may be greater than the maximum brightness of any one of the plurality of first pixels.

[0023] A display device according to another embodiment for solving the above problem comprises a substrate, photoreceiving electrodes spaced apart from each other on the substrate, pixel electrodes spaced apart from each other on the substrate and spaced apart from the photoreceiving electrodes, a first light-emitting layer disposed on a first pixel electrode among the pixel electrodes, a second light-emitting layer disposed on a second pixel electrode among the pixel electrodes, a first photoelectric conversion layer disposed on a first photoreceiving electrode among the photoreceiving electrodes and adjacent to the first light-emitting layer, and a second photoelectric conversion layer disposed on a second photoreceiving electrode among the photoreceiving electrodes, wherein the width of the second photoelectric conversion layer is different from the width of the first photoelectric conversion layer.

[0024] The second light-emitting layer may be adjacent to the second photoelectric conversion layer than the first photoelectric conversion layer, and the first light-emitting layer may be adjacent to the first photoelectric conversion layer than the second photoelectric conversion layer.

[0025] The second light-emitting layer may have a greater maximum light-emitting brightness than the first light-emitting layer.

[0026] The width of the first light-emitting layer may be larger than the width of the second light-emitting layer. Effects of the invention

[0027] According to a display device of one embodiment, by separately forming different light sensors in a first area and a second area of ​​a display panel, both fingerprint detection and blood pressure measurement are possible.

[0028] The effects according to the embodiments are not limited to those exemplified above, and a wider variety of effects are included in this specification. Brief explanation of the drawing

[0029] FIG. 1 is a plan view of a display device according to one embodiment. FIG. 2 is a block diagram of a display device according to one embodiment. FIG. 3 is a plan view showing the area of ​​a display device according to one embodiment. FIG. 4 is a cross-sectional view showing fingerprint detection in a first area according to one embodiment. FIG. 5 is a cross-sectional view showing a second zone blood pressure measurement according to one embodiment. Figure 6 is a graph showing pressure measurements according to pressurization time. Figure 7 is a graph showing the pulse wave signal according to the pressurization time. Figure 8 is a graph showing the pulse wave signal according to pressure. FIG. 9 is a planar arrangement of pixels and light sensors of a display panel according to one embodiment. Figure 10 is a schematic diagram comparing the planar shapes of the optical sensors. FIG. 11 is a planar arrangement of pixels and light sensors of a display panel according to another embodiment. FIG. 12 is a cross-sectional view of a pixel and a light sensor according to one embodiment. FIG. 13 is a planar arrangement of pixels and light sensors of a display panel of another embodiment. FIG. 14 is a schematic diagram comparing the planar shape of a pixel according to another embodiment. FIG. 15 is a schematic diagram comparing the cross-sectional shape of a pixel according to another embodiment. FIG. 16 is a planar arrangement of pixels and light sensors of a display panel of another embodiment. FIG. 17 is a planar arrangement of pixels and light sensors of a display panel of another embodiment. FIGS. 18 and FIGS. 19 are plan views showing the area of ​​a display device according to another embodiment. Specific details for implementing the invention

[0030] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0031] When an element or layer is referred to as being "on" another element or layer, this includes cases where another layer or element is interposed directly on or in the middle of another element. Throughout the specification, the same reference numerals refer to the same components. Shapes, sizes, ratios, angles, numbers, etc., disclosed in the drawings for describing embodiments are exemplary and therefore the invention is not limited to the depicted details.

[0032] Specific embodiments will be described below with reference to the attached drawings.

[0033] FIG. 1 is a plan view of a display device according to one embodiment.

[0034] Referring to FIG. 1, the display device (1) may include various electronic devices that provide a display screen. Examples of the display device (1) may include, but are not limited to, mobile phones, smartphones, tablet PCs, mobile communication terminals, electronic notebooks, e-books, PDAs (Personal Digital Assistants), PMPs (portable multimedia players), navigation systems, UMPCs (Ultra Mobile PCs), televisions, game consoles, wristwatch-type electronic devices, head-mounted displays, personal computer monitors, laptop computers, car dashboards, digital cameras, camcorders, external advertising boards, electronic display boards, various medical devices, various inspection devices, various home appliances including a display area such as refrigerators or washing machines, Internet of Things devices, etc. Representative examples of the display device (1) described below include smartphones, tablet PCs, and laptops, but are not limited thereto.

[0035] The display device (1) may include a display panel (10), a display driving unit (20), a circuit board (30), a light detection circuit (50), a pressure detection circuit (40), a main circuit board (700), and a main processor (710).

[0036] The display panel (10) may include an active area (AAR) and an inactive area (NAR).

[0037] The active area (AAR) includes a display area where the screen is displayed. The active area (AAR) may completely overlap with the display area. Multiple pixels (PX) that display an image may be arranged in the display area. Each pixel (PX) may include a light-emitting part that emits light.

[0038] The active area (AAR) further includes a light sensing area. The light sensing area is an area that responds to light and is configured to sense the amount or wavelength of incident light. The light sensing area may overlap with the display area. In one embodiment, the light sensing area in a planar view may completely overlap with the active area (AAR). In this case, the light sensing area and the display area may be identical. In another embodiment, the light sensing area may be placed only in a part of the active area (AAR). For example, the light sensing area may be placed only in a limited area required for fingerprint recognition. In this case, the light sensing area may overlap with a part of the display area but not with another part of the display area.

[0039] Multiple light sensors (PS) that respond to light can be placed in the light sensing area.

[0040] A non-active area (NAR) may be placed around an active area (AAR). A display driver (20) may be placed in the non-active area (NAR). The display driver (20) may drive a plurality of pixels (PX) and / or a plurality of light sensors (PS). The display driver (20) may output signals and voltages that drive the display panel (10). The display driver (20) may be formed as an integrated circuit (IC) and mounted on the display panel (10). Signal wiring that transmits signals between the display driver (20) and the active area (AAR) may be further placed in the non-active area (NAR). As another example, the display driver (20) may be mounted on a circuit board (30).

[0041] The circuit board (30) can be attached to one end of the display panel (10) using an anisotropic conductive film (ACF). The lead lines of the circuit board (30) can be electrically connected to the pad portion of the display panel (10). The circuit board (30) may be a flexible film such as a flexible printed circuit board or a chip-on-film.

[0042] A light detection circuit (50) may be disposed on the circuit board (30). The light detection circuit (50) may be formed as an integrated circuit and attached to the upper surface of the circuit board (30). The light detection circuit (50) may be connected to the display layer of the display panel (10). The light detection circuit (50) can detect a photocurrent generated by photocharges incident on a plurality of light sensors (PS) of the display panel (10). The light detection circuit (50) can recognize the user's pulse wave based on the photocurrent.

[0043] A pressure sensing circuit (40) may be disposed on the circuit board (30). The pressure sensing circuit (40) may be formed as an integrated circuit and attached to the upper surface of the circuit board (30). The pressure sensing circuit (40) may be connected to the display layer of the display panel (10). The pressure sensing circuit (40) may detect an electrical signal caused by pressure applied to a plurality of pressure sensors of the display panel (10). The pressure sensing circuit (40) may generate pressure data according to the change in the electrical signal detected by the pressure sensors and transmit it to the main processor (710).

[0044] The main circuit board (700) may be a printed circuit board or a flexible printed circuit board.

[0045] The main circuit board (700) may include a main processor (710).

[0046] The main processor (710) can control all functions of the display device (1). For example, the main processor (710) can output digital video data to the display driving unit (20) via the circuit board (30) so that the display panel (10) displays an image. In addition, the main processor (710) can receive touch data from a touch driving circuit (not shown), determine the user's touch coordinates, and then execute an application indicated by an icon displayed at the user's touch coordinates.

[0047] The main processor (710) can identify the fingerprint (F) pattern of the finger based on an electrical signal (i.e., photocurrent) based on the difference in the amount of light input from the light detection circuit (50).

[0048] Additionally, the main processor (710) can calculate a pulse wave signal (PPG) that reflects changes in blood according to heartbeats based on an optical signal input from a light detection circuit (50). Additionally, the main processor (710) can calculate the user's touch pressure based on an electrical signal input from a pressure detection circuit (40). Furthermore, the main processor (710) can calculate the user's blood pressure based on the pulse wave signal (PPG) and the pressure signal.

[0049] The main processor (710) may be an application processor, a central processing unit, or a system chip made of an integrated circuit.

[0050] In addition, the main circuit board (700) may be further equipped with a mobile communication module capable of transmitting and receiving wireless signals with at least one of a base station, an external terminal, or a server on a mobile communication network. The wireless signals may include voice signals, video call signals, or various forms of data resulting from the transmission and reception of text / multimedia messages.

[0051] FIG. 2 is a block diagram showing a display device according to one embodiment.

[0052] Referring to FIG. 2, the display device (1) includes a display panel (10) including a plurality of pixels (PX), a display driving unit (20), a scan driving unit (21), a light-emitting driving unit (23), a light detection circuit (50), a pressure detection circuit (40), and a main processor (710).

[0053] The main processor (710) can receive an optical signal from the light detection circuit (50). The main processor (710) receives an electric current according to the optical signal and can derive the ridge (RID in FIG. 4) and valley (VAL in FIG. 4) portions of the fingerprint (F in FIG. 4). The main processor (710) can identify the fingerprint (F in FIG. 4) pattern of the finger.

[0054] The main processor (710) can receive an optical signal from the light detection circuit (50). Additionally, the main processor (710) can receive an electrical signal from the pressure detection circuit (40). Based on the received signals, the main processor (710) can calculate a pulse wave signal (PPG of FIG. 7) that reflects changes in blood according to heartbeats. Based on the pulse wave signal (PPG of FIG. 7), the main processor (710) can calculate the user's blood pressure.

[0055] The main processor (710) is responsible for driving and controlling the light detection circuit (50), the pressure detection circuit (40), and the display control unit (24). The main processor (710) can output image information to the display control unit (24). For example, the main processor (710) can output image information including a calculated pulse wave signal (PPG), a blood pressure measurement value, and blood pressure information to the display control unit (24).

[0056] The display control unit (24) receives an image signal supplied from the main processor (710). Additionally, the display control unit (24) can generate a scan control signal (SCS) for controlling the operation timing of the scan drive unit (21), a light emission control signal (ECS) for controlling the operation timing of the light emission drive unit (23), and a data control signal (DCS) for controlling the operation timing of the data drive unit (22). The display control unit (24) can output image data (DATA) and a data control signal (DCS) to the data drive unit (22). The display control unit (24) can output the scan control signal (SCS) to the scan drive unit (21) and the light emission control signal (ECS) to the light emission drive unit (23).

[0057] The display control unit (24) may be electrically connected to the display panel (10) and / or the main processor (710) via wiring or via a communication network. In one embodiment, at least a portion of the display control unit (24) may be directly attached to the display panel (10) in the form of a driving chip.

[0058] The data driver (22) can receive image data (DATA) and a data control signal (DCS) from the display control unit (24). The data driver (22) can convert the image data (DATA) into an analog data voltage according to the data control signal (DCS). The data driver (22) can output the converted analog data voltage to the data wiring (DL) in synchronization with the scan signal.

[0059] The scan drive unit (21) can generate scan signals according to the scan control signal (SCS) and sequentially output the scan signals to the scan wiring (SL1~SLn).

[0060] Although not shown in the drawings, a driving voltage ('ELVDD' in FIG. 8), a common voltage ('ELVSS' in FIG. 8), and power supply voltage wiring (not shown) may be further included. The power supply voltage wiring may include driving voltage wiring and common voltage wiring. The driving voltage (ELVDD) may be a high potential voltage for driving the light-emitting element and the photoelectric conversion element, and the common voltage may be a low potential voltage for driving the light-emitting element and the photoelectric conversion element. That is, the driving voltage may have a higher potential than the common voltage.

[0061] The display control signal may include a scan control signal (SCS), a data control signal (DCS), and a light emission control signal (ECS). The display control signal may be output from the scan driver (21) and the data driver (22).

[0062] The light-emitting driver (23) can generate a light-emitting signal (Ek_1) according to the light-emitting control signal (ECS) and sequentially output the light-emitting signal (Ek_1) to the light-emitting wiring (ELL). Meanwhile, although the light-emitting driver (23) is shown as existing separately from the scan driver (21), it is not limited thereto and may be included in the scan driver (21).

[0063] The data driving unit (22) and the display control unit (24) may be included in the display driving unit (20) that controls the operation of the display panel (10). The data driving unit (22) and the display control unit (24) may be formed as an integrated circuit (IC) and mounted on the display driving unit (20).

[0064] Each of the plurality of pixels (PX) can be connected to at least one of the scan lines (SL1~SLn), at least one of the data lines (DL), and at least one of the light-emitting lines (ELL).

[0065] Each of the plurality of optical sensors (PS) can be connected to any one of the scan lines (SL1~SLn) and any one of the read-out lines (ROL).

[0066] A plurality of scan lines (SL1 to SLn) can connect the scan driving unit (21) to each of a plurality of pixels (PX) and a plurality of optical sensors (PS). A plurality of scan lines (SL1 to SLn) can provide a scan signal output from the scan driving unit (21) to each of the plurality of pixels (PX).

[0067] A plurality of data wires (DL) can connect the data driver (22) and each of the plurality of pixels (PX). The plurality of data wires (DL) can provide image data output from the data driver (22) to each of the plurality of pixels (PX).

[0068] A plurality of light-emitting wires (ELL) can connect the light-emitting driver (23) and each of the plurality of pixels (PX). A plurality of light-emitting wires (ELL) can provide a light-emitting control signal output from the light-emitting driver (23) to each of the plurality of pixels (PX).

[0069] FIG. 3 is a plan view showing the area of ​​a display device according to one embodiment.

[0070] Referring to FIG. 3, the active area (AAR) includes a fingerprint measurement area (110) and a blood pressure measurement area (120).

[0071] Among the multiple pixel active areas (AAR), the area for measuring fingerprints is defined as a fingerprint measurement area (110), and the area for measuring blood pressure can be defined as a blood pressure measurement area (120). Specifically, the fingerprint measurement area (110) may be an area that emits light. Additionally, the fingerprint measurement area (110) may be an area that detects the amount or wavelength of incident light. The fingerprint measurement area (110) can measure fingerprints by detecting light reflected from the user's (OBJ) finger from the emitted light. Additionally, the blood pressure measurement area (120) may be an area that emits light.

[0072] The blood pressure measurement area (120) may be an area that detects the amount or wavelength of incident light. The blood pressure measurement area (120) can measure blood pressure by detecting light reflected from the user's (OBJ) finger from the emitted light. The fingerprint measurement area (110) and the blood pressure measurement area (120) may overlap with the active area (AAR).

[0073] For example, the blood pressure measurement area (120) may be placed only in a limited area necessary for blood pressure measurement within the active area (AAR). As with 3, the blood pressure measurement area (120) may be placed so that the blood pressure measurement area (120) surrounds the fingerprint measurement area (110), and the blood pressure measurement area (120) may have a rectangular shape in a plan view. Additionally, the fingerprint measurement area (110) may be defined as an area exactly identical to the active area (AAR). In this case, the front of the active area (AAR) may be utilized as an area for fingerprint measurement.

[0074] A fingerprint measurement area (110) may have a plurality of fingerprint display pixels (APX) arranged therein and a plurality of fingerprint light sensors (PS1) that respond to light arranged therein. The fingerprint light sensors (PS1) for fingerprint measurement in the fingerprint measurement area (110) may include a photoelectric conversion element ('PD' in FIG. 12) that detects incident light and converts it into an electrical signal.

[0075] The blood pressure measurement area (120) may have a plurality of blood pressure display pixels (BPX) and a plurality of blood pressure optical sensors (PS2) that respond to light. The third optical sensors for blood pressure measurement in the blood pressure measurement area (120) may include a photoelectric conversion element ('PD' in FIG. 12) that detects incident light and converts it into an electrical signal. A detailed description regarding the fingerprint display pixels (APX) of the fingerprint measurement area (110), the fingerprint optical sensor (PS1), the blood pressure display pixels (BPX) of the blood pressure measurement area (120), and the blood pressure optical sensor (PS2) will be described later in conjunction with FIG. 9.

[0076] FIG. 4 is a cross-sectional view showing fingerprint detection in a first area according to one embodiment.

[0077] Referring to FIG. 4, the fingerprint measurement area (110) may further include a window (WDL) disposed on a display panel (10). The display panel (10) may include a substrate (SUB), a pressure layer (PRN) disposed on the substrate (SUB), a display layer (DPL) disposed on the pressure layer (PRN) and including fingerprint display pixels (APX) and fingerprint light sensors (PS1), and an encapsulation layer (TFEL) disposed on the display layer (DPL).

[0078] When a user's (OBJ) finger comes into contact with the upper surface of the window (WDL) of the fingerprint measurement area (110), light emitted from the fingerprint display pixels (APX) of the display panel (10) can be reflected from the valleys (VAL) between the ridges (RID) of the user's fingerprint (F). In this case, the ridge (RID) portion of the fingerprint (F) comes into contact with the upper surface of the window (WDL), while the valley (VAL) portion of the fingerprint (F) does not come into contact with the window (WDL). That is, the upper surface of the window (WDL) comes into contact with air at the valley (VAL) portion.

[0079] When a fingerprint (F) comes into contact with the upper surface of a window (WDL), light emitted from the light-emitting part of a fingerprint display pixel (APX) may be reflected from the ridges (RID) and valleys (VAL) of the fingerprint (F). At this time, since the refractive index of the fingerprint (F) and the refractive index of air are different, the amount of light reflected from the ridges (RID) and the amount of light reflected from the valleys (VAL) of the fingerprint (F) may be different. Accordingly, the ridge (RID) and valley (VAL) portions of the fingerprint (F) can be derived based on the difference in the amount of light of the reflected light, that is, the light incident on the fingerprint light sensor (PS1). Since the fingerprint light sensor (PS1) outputs an electrical signal (i.e., photocurrent) according to the difference in the amount of light, the fingerprint (F) pattern of the finger can be identified in the fingerprint measurement area (110) of the display panel (10).

[0080] FIG. 5 is a cross-sectional view showing a second zone blood pressure measurement according to one embodiment. FIG. 6 is a graph showing pressure measurements according to pressurization time. FIG. 7 is a graph showing pulse wave signals according to pressurization time. FIG. 8 is a graph showing pulse wave signals according to pressure.

[0081] Referring to FIG. 5, the blood pressure measurement area (120) may further include a window (WDL) disposed on a display panel (10). The display panel (10) may include a substrate (SUB), a pressure layer (PRN) disposed on the substrate (SUB), a display layer (DPL) disposed on the pressure layer (PRN) and including blood pressure display pixels (BPX) and blood pressure optical sensors (PS2), and a sealing layer (TFEL) disposed on the display layer (DPL).

[0082] Referring further to FIG. 6, when a user (OBJ)'s finger comes into contact with the upper surface of the window (WDL) in the blood pressure measurement area (120), the pressure layer (PRN) can measure the pressure applied by the user (OBJ). Accordingly, the main processor (710) can calculate pressure data over time. For example, as the user (OBJ) comes into contact with the finger in the blood pressure measurement area (120), the pressure detected by the pressure layer (PRN) may gradually increase over time and reach a maximum value. As the pressure (i.e., contact pressure) increases, the blood vessel may constrict, causing the blood flow to decrease or become zero.

[0083] Referring further to Fig. 7, meanwhile, to generate a pulse wave signal (PPG), pulse wave information over time is required along with pressure data. During the systole of the heart, blood ejected from the left ventricle moves to peripheral tissues, increasing the blood volume in the arteries. Additionally, during the systole, red blood cells transport more oxygenated hemoglobin to peripheral tissues. During the diastole of the heart, there is partial blood absorption from peripheral tissues toward the heart. At this time, when light emitted from a display pixel is irradiated onto peripheral blood vessels, the irradiated light can be absorbed by the peripheral tissues. Light absorption is dependent on the hematocrit and blood volume. Light absorption may have a maximum value during the systole of the heart and a minimum value during the diastole of the heart. Since light absorption is inversely proportional to the amount of light incident on the blood pressure optical sensor (PS2) of the blood pressure measurement area (120), the light absorption at that time can be estimated through the received light data of the amount of light incident on the blood pressure optical sensor (PS2), and through this, a pulse wave signal (PPG) value over time can be generated as exemplified in FIG. 7. Here, the blood pressure optical sensor (PS2) receives light reflected from the user's peripheral blood vessels and must recognize the difference in light according to the difference in blood flow volume of the peripheral blood vessels. Therefore, it is necessary to detect more light than the fingerprint optical sensor (PS1) that detects the user's fingerprint.

[0084] Referring further to FIG. 8, accordingly, the main processor (710) can generate a pulse wave signal (PPG) through pressure data and pulse wave signal (PPG) values. However, since the pulse wave signal (PPG) exhibits a phenomenon of oscillating according to the heartbeat cycle, the pulse wave signal (PPG) can reflect changes in blood pressure according to the heartbeat. The main processor (710) can calculate the blood pressure of the user (OBJ) in the blood pressure measurement area (120) using the peaks of the pulse wave signal (PPG).

[0085] FIG. 9 is a planar arrangement of pixels and light sensors of a display panel according to one embodiment.

[0086] Referring to FIG. 9, a plurality of fingerprint display pixels (APX) and a plurality of fingerprint light sensors (PS1) may be repeatedly arranged in the fingerprint measurement area (110).

[0087] A plurality of fingerprint display pixels (APX) may include a first sub-fingerprint pixel (APX1), a second sub-fingerprint pixel (APX2), a third sub-fingerprint pixel (APX3), and a fourth sub-fingerprint pixel (APX4). For example, the first sub-fingerprint pixel (APX1) may emit light of a red wavelength, the second sub-fingerprint pixel (APX2) and the fourth sub-fingerprint pixel (APX4) may emit light of a green wavelength, and the third sub-fingerprint pixel (APX3) may emit light of a blue wavelength. Each of the plurality of fingerprint display pixels (APX) may include a plurality of light-emitting regions that emit light. A plurality of fingerprint light sensors (PS1) may include a plurality of light-sensing regions that detect incident light.

[0088] A first sub-fingerprint pixel (APX1), a second sub-fingerprint pixel (APX2), a third sub-fingerprint pixel (APX3), and a fourth sub-fingerprint pixel (APX4) and a plurality of fingerprint light sensors (PS1) may be alternately arranged in a first direction (X) and a second direction (Y) intersecting the first direction (X). In one embodiment, the first sub-fingerprint pixel (APX1) and the third sub-fingerprint pixel (APX3) may be alternately arranged to form a first row along the first direction (X), and the second row adjacent thereto may have the second sub-fingerprint pixel (APX2) and the fourth sub-fingerprint pixel (APX4) repeatedly arranged along the first direction (X). Pixels (PX) belonging to the first row may be arranged in an alternating manner in the first direction (X) with respect to pixels (PX) belonging to the second row. The arrangement of the first row and the second row may be repeated up to the nth row.

[0089] In other words, the first sub-fingerprint pixel (APX1) and the fourth sub-fingerprint pixel (APX4) are arranged in a first diagonal direction (DR1) that intersects the first direction (X) and the second direction (Y), and the second sub-fingerprint pixel (APX2) and the third sub-fingerprint pixel (APX3) can be arranged in the first diagonal direction (DR1). The second sub-fingerprint pixel (APX2) and the third sub-fingerprint pixel (APX3) are arranged in a second diagonal direction (DR2) that intersects the first diagonal direction (DR1), and the first sub-fingerprint pixel (APX1) and the fourth sub-fingerprint pixel (APX4) can be arranged in the second diagonal direction (DR2). The first diagonal direction (DR1) is a direction that is obliquely inclined between the first direction (X) and the second direction (Y), and the second diagonal direction (DR2) can be a direction that is orthogonal to the first diagonal direction (DR1). For example, the first diagonal direction (DR1) may be a direction inclined at 45° with respect to the first direction (X) and the second direction (Y), but is not limited thereto.

[0090] Each fingerprint optical sensor (PS1) may be spaced apart between the first sub-fingerprint pixel (APX1) and the third sub-fingerprint pixel (APX3) forming the first row. The first sub-fingerprint pixel (APX1), the fingerprint optical sensor (PS1), and the third sub-fingerprint pixel (APX3) may be alternately arranged along the first direction (X). Each fingerprint optical sensor (PS1) may be spaced apart between the second sub-fingerprint pixel (APX2) and the fourth sub-fingerprint pixel (APX4) forming the second row. The second sub-fingerprint pixel (APX2), the fingerprint optical sensor (PS1), and the fourth sub-fingerprint pixel (APX4) may be alternately arranged along the first direction (X). The number of fingerprint optical sensors (PS1) belonging to the first row may be the same as the number of fingerprint optical sensors (PS1) belonging to the second row. The arrangement of the first row and the second row may be repeated up to the nth row.

[0091] Due to the arrangement position and planar shape of the first sub-fingerprint pixel (APX1), the second sub-fingerprint pixel (APX2), the third sub-fingerprint pixel (APX3), and the fourth sub-fingerprint pixel (APX4), the distance (D12) between the center (C1) of the first sub-fingerprint pixel (APX1) and the center (C2) of the second sub-fingerprint pixel (APX2) that are adjacent to each other, the distance (D23) between the center (C2) of the second sub-fingerprint pixel (APX2) and the center (C3) of the third sub-fingerprint pixel (APX3) that are adjacent to each other, the distance (D14) between the center (C1) of the first sub-fingerprint pixel (APX1) and the center (C4) of the fourth sub-fingerprint pixel (APX4) that are adjacent to each other, and the distance (D34) between the center (C3) of the third sub-fingerprint pixel (APX3) and the center (C4) of the fourth sub-fingerprint pixel (APX4) that are adjacent to each other may be substantially the same.

[0092] Additionally, due to the arrangement position and planar shape of the first sub-fingerprint pixel (APX1), the second sub-fingerprint pixel (APX2), the third sub-fingerprint pixel (APX3), the fourth sub-fingerprint pixel (APX4), and the fingerprint light sensor (PS1), the distance (D11) between the center (C1) of the adjacent first sub-fingerprint pixel (APX1) and the center (C5) of the fingerprint light sensor (PS1), the distance (D22) between the center (C2) of the adjacent second sub-fingerprint pixel (APX2) and the center (C5) of the fingerprint light sensor (PS1), the distance (D33) between the center (C3) of the adjacent third sub-fingerprint pixel (APX3) and the center (C5) of the fingerprint light sensor (PS1), and the distance (D44) between the center (C4) of the adjacent fourth sub-fingerprint pixel (APX4) and the center (C5) of the fingerprint light sensor (PS1) may be substantially the same.

[0093] The size of the light-emitting area of ​​each fingerprint display pixel (APX) may differ. The size of the light-emitting area of ​​the second sub-fingerprint pixel (APX2) and the fourth sub-fingerprint pixel (APX4) may be smaller than the size of the light-emitting area of ​​the first sub-fingerprint pixel (APX1) or the third sub-fingerprint pixel (APX3). Although the shape of each pixel (PX) is illustrated as a rhombus, it is not limited thereto, and the shape of each pixel (PX) may be a rectangle, octagon, circle, or other polygon.

[0094] A fingerprint display pixel unit (APXU) may each include a first sub-fingerprint pixel (APX1), a second sub-fingerprint pixel (APX2), a third sub-fingerprint pixel (APX3), and a fourth sub-fingerprint pixel (APX4). The fingerprint display pixel unit (APXU) refers to a group of color pixels capable of expressing a grayscale.

[0095] In the blood pressure measurement area (120), a plurality of blood pressure display pixels (BPX) and a plurality of blood pressure optical sensors (PS2) can be repeatedly arranged.

[0096] A plurality of blood pressure display pixels (BPX) may include a first sub-blood pressure pixel (BPX1), a second sub-blood pressure pixel (BPX2), a third sub-blood pressure pixel (BPX3), and a fourth sub-blood pressure pixel (BPX4). For example, the first sub-blood pressure pixel (BPX1) may emit light of a red wavelength, the second sub-blood pressure pixel (BPX2) and the fourth sub-blood pressure pixel (BPX4) may emit light of a green wavelength, and the third sub-blood pressure pixel (BPX3) may emit light of a blue wavelength. Each of the plurality of blood pressure display pixels (BPX) may include a plurality of light-emitting regions that emit light. A plurality of blood pressure light sensors (PS2) may include a plurality of light-sensing regions that detect incident light.

[0097] The arrangement of the first sub-blood pressure pixel (BPX1), the second sub-blood pressure pixel (BPX2), the third sub-blood pressure pixel (BPX3), and the fourth sub-blood pressure pixel (BPX4) is substantially the same as the arrangement of the fingerprint display pixels (APX), so it is omitted.

[0098] Each blood pressure optical sensor (PS2) may be spaced apart between the first sub-blood pressure pixel (BPX1) and the third sub-blood pressure pixel (BPX3) forming the first row. The first sub-blood pressure pixel (BPX1), the blood pressure optical sensor (PS2), and the third sub-blood pressure pixel (BPX3) may be alternately arranged along the first direction (X). Each blood pressure optical sensor (PS2) may be spaced apart between the second sub-blood pressure pixel (BPX2) and the fourth sub-blood pressure pixel (BPX4) forming the second row. The second sub-blood pressure pixel (BPX2), the blood pressure optical sensor (PS2), and the fourth sub-blood pressure pixel (BPX4) may be alternately arranged along the first direction (X). The number of blood pressure optical sensors (PS2) belonging to the first row may be the same as the number of blood pressure optical sensors (PS2) belonging to the second row. The arrangement of the first row and the second row may be repeated up to the nth row.

[0099] Referring further to FIG. 10, the area of ​​the blood pressure optical sensor (PS2) may be larger than the area of ​​the fingerprint optical sensor (PS1). An explanation regarding this will be provided later in conjunction with FIG. 10.

[0100] Due to the arrangement position and planar shape of the first sub-blood pressure pixel (BPX1), the second sub-blood pressure pixel (BPX2), the third sub-blood pressure pixel (BPX3), and the fourth sub-blood pressure pixel (BPX4), the distance (F12) between the center (E1) of the first sub-blood pressure pixel (BPX1) and the center (E2) of the second sub-blood pressure pixel (BPX2) that are adjacent to each other, the distance (F23) between the center (E2) of the second sub-blood pressure pixel (BPX2) and the center (E3) of the third sub-blood pressure pixel (BPX3) that are adjacent to each other, the distance (F14) between the center (E1) of the first sub-blood pressure pixel (BPX1) and the center (E4) of the fourth sub-blood pressure pixel (BPX4) that are adjacent to each other, and the distance (F34) between the center (E3) of the third sub-blood pressure pixel (BPX3) and the center (E4) of the fourth sub-blood pressure pixel (BPX4) that are adjacent to each other may be substantially the same.

[0101] Additionally, due to the arrangement position and planar shape of the first sub-blood pressure pixel (BPX1), the second sub-blood pressure pixel (BPX2), the third sub-blood pressure pixel (BPX3), the fourth sub-blood pressure pixel (BPX4), and the blood pressure optical sensor (PS2), the distance (F11) between the center (E1) of the adjacent first sub-blood pressure pixel (BPX1) and the center (E5) of the blood pressure optical sensor (PS2), the distance (F22) between the center (E2) of the adjacent second sub-blood pressure pixel (BPX2) and the center (E5) of the blood pressure optical sensor (PS2), the distance (F33) between the center (E3) of the adjacent third sub-blood pressure pixel (BPX3) and the center (E5) of the blood pressure optical sensor (PS2), and the distance (F44) between the center (E4) of the adjacent fourth sub-blood pressure pixel (BPX4) and the center (E5) of the blood pressure optical sensor (PS2) may be substantially the same.

[0102] The size of the light-emitting area of ​​each blood pressure display pixel (BPX) may differ. The size of the light-emitting area of ​​the second sub-blood pressure pixel (BPX2) and the fourth sub-blood pressure pixel (BPX4) may be smaller than the size of the light-emitting area of ​​the first sub-blood pressure pixel (BPX1) or the third sub-blood pressure pixel (BPX3). Although the shape of each pixel (PX) is illustrated as a rhombus, it is not limited thereto, and the shape of each pixel (PX) may be a rectangle, octagon, circle, or other polygon.

[0103] Although the shapes of the fingerprint optical sensor (PS1) and the blood pressure optical sensor (PS2) are depicted as rhombuses, they are not limited thereto. As in the case of FIG. 10, the shapes of the fingerprint optical sensor (PS1) and the blood pressure optical sensor (PS2) may be circular. However, even in this case, the area of ​​the blood pressure optical sensor (PS2) may be larger than the area of ​​the fingerprint optical sensor (PS1). Additionally, the shapes of the fingerprint optical sensor (PS1) and the blood pressure optical sensor (PS2) may be rectangular, octagonal, or other polygons.

[0104] A single blood pressure display pixel unit (BPXU) may include one first sub-blood pressure pixel (BPX1), one second sub-blood pressure pixel (BPX2), one third sub-blood pressure pixel (BPX3), and one fourth sub-blood pressure pixel (BPX4), respectively. The second pixel unit (BPXU) refers to a group of color pixels capable of expressing a grayscale.

[0105] FIG. 11 is a planar arrangement of pixels and light sensors of a display panel according to another embodiment. In FIG. 11, the dotted box at the top left illustrates the shape of a fingerprint light sensor (PS1) and a blood pressure light sensor (PS2) arranged in an overlapping manner.

[0106] Referring to FIG. 11, the area (AA2) of the blood pressure optical sensor (PS2) positioned adjacent to the blood pressure display pixel (BPX) may differ from the area (AA1) of the fingerprint optical sensor (PS1) positioned adjacent to the fingerprint display pixel (APX). For example, the area (AA2) of the blood pressure optical sensor (PS2) may be larger than the area (AA1) of the fingerprint optical sensor (PS1) positioned adjacent to the fingerprint display pixel (APX). As the area (AA2) of the blood pressure optical sensor (PS2) increases, the effective light-receiving area increases, allowing for the reception of more light. Therefore, even if the light-emitting layers of the blood pressure optical sensor (PS2) and the fingerprint optical sensor (PS1) are made of the same material and have the same thickness, the amount of light received by the blood pressure optical sensor (PS2) can be made larger. In one embodiment, the amount of light received by the blood pressure optical sensor (PS2) may be 1.5 times or more the amount of light received by the fingerprint optical sensor (PS1), and in this embodiment, the ratio of light received can be satisfied by setting the area of ​​the blood pressure optical sensor (PS2) to 1.5 times that of the fingerprint optical sensor (PS1).

[0107] The planar shape of the blood pressure optical sensor (PS2) is substantially the same as that of the fingerprint optical sensor (PS1), and the two may be similar in shape. The blood pressure optical sensor (PS2) has a first length (DD1) and a second length (D2) that are both larger than those of the fingerprint optical sensor (PS1), and the deviation rate of the first length (DD1) and the deviation rate of the second length (D2) may be substantially the same. However, the embodiments are not limited to the examples described above, and the blood pressure optical sensor (PS2) may have a larger area than the fingerprint optical sensor (PS1) but have a different planar shape.

[0108] FIG. 12 is a cross-sectional view of a pixel and a light sensor according to one embodiment.

[0109] Referring to FIG. 12, a buffer layer (510) is disposed on a substrate (SUB). The buffer layer (510) may include silicon nitride, silicon oxide, or silicon oxynitride, etc.

[0110] A first thin-film transistor (TFT1) and a second thin-film transistor (TFT2) may be placed on the buffer layer (510).

[0111] A plurality of thin-film transistors (TFT1, TFT2) may each include semiconductor layers (A1, A2), a gate insulating layer (521) disposed on a portion of the semiconductor layers (A1, A2), gate electrodes (G1, G2) on the gate insulating layer (521), an interlayer insulating film (522) covering each of the semiconductor layers (A1, A2) and each of the gate electrodes (G1, G2), and source electrodes (S1, S2) and drain electrodes (D1, D2) on the interlayer insulating film (522).

[0112] The semiconductor layers (A1, A2) may each form the channels of the first thin-film transistor (TFT1) and the second thin-film transistor (TFT2). The semiconductor layers (A1, A2) may include polycrystalline silicon. In other embodiments, the semiconductor layers (A1, A2) may include single-crystal silicon, low-temperature polycrystalline silicon, amorphous silicon, or oxide semiconductors. The oxide semiconductor may include, for example, binary compounds (ABx), ternary compounds (ABxCy), and quaternary compounds (ABxCyDz) containing indium, zinc, gallium, tin, titanium, aluminum, hafnium (Hf), zirconium (Zr), magnesium (Mg), etc. The semiconductor layers (A1, A2) may each include a channel region, an impurity-doped source region, and a drain region.

[0113] A gate insulating layer (521) is disposed on the semiconductor layers (A1, A2). The gate insulating layer (521) electrically insulates the first gate electrode (G1) from the first semiconductor layer (A1) and electrically insulates the second gate electrode (G2) from the second semiconductor layer (A2). The gate insulating layer (521) may be made of an insulating material, for example, silicon oxide (SiOx), silicon nitride (SiNx), or a metal oxide.

[0114] On the gate insulating layer (521), the first gate electrode (G1) of the first thin-film transistor (TFT1) and the second gate electrode (G2) of the second thin-film transistor (TFT2) are disposed. The gate electrodes (G1, G2) can each be formed on the upper part of the channel region of the semiconductor layers (A1, A2), that is, at a position overlapping with the channel region on the gate insulating layer (521).

[0115] An interlayer insulation may be disposed on the gate electrodes (G1, G2). The interlayer insulating film (522) may include an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride, hafnium oxide, or aluminum oxide. Additionally, although not illustrated, the interlayer insulating film (522) may be composed of a plurality of insulating films and may further include a conductive layer forming a capacitor second electrode between the insulating films.

[0116] Source electrodes (S1, S2) and drain electrodes (D1, D2) are disposed on the interlayer insulating film (522). The first source electrode (S1) of the first thin-film transistor (TFT1) can be electrically connected to the drain region of the first semiconductor layer (A1) through a contact hole penetrating the interlayer insulating film (522) and the gate insulating layer (521). The second source electrode (S2) of the second thin-film transistor (TFT2) can be electrically connected to the drain region of the second semiconductor layer (A2) through a contact hole penetrating the interlayer insulating film (522) and the gate insulating layer (521). Each source electrode (S1, S2) and drain electrode (D1, D2) may include one or more metals selected from aluminum (Al), molybdenum (Mo), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), titanium (Ti), tantalum (Ta), tungsten (W), and copper (Cu).

[0117] A flattening layer (530) may be formed on an interlayer insulating film (522) to cover each of the source electrodes (S1, S2) and drain electrodes (D1, D2). The flattening layer (530) may be formed of an organic insulating material, etc. The flattening layer (530) may have a flat surface and may include a contact hole that exposes either of the source electrodes (S1, S2) and drain electrodes (D1, D2).

[0118] A light-emitting element layer (EML) may be disposed on the planarization layer (530). The light-emitting element layer (EML) may include a first light-emitting element (EL1), a second light-emitting element (EL2), a first photoelectric conversion element (PD1), a second photoelectric conversion element (PD2), and a bank layer (BK). The first light-emitting element (EL1) may include a first pixel electrode (571), a first light-emitting layer (581), and a common electrode (590), and the second light-emitting element (EL2) may include a second pixel electrode (572), a second light-emitting layer (582), and a common electrode (590). Additionally, the first photoelectric conversion element (PD1) may include a first photoreceiving electrode (573), a first photoelectric conversion layer (583), and a common electrode (590), and the second photoelectric conversion element (PD2) may include a second photoreceiving electrode (574), a second photoelectric conversion layer (584), and a common electrode (590).

[0119] Pixel electrodes (57a) of a first light-emitting element (EL1) and a second light-emitting element (EL2) may be disposed on the planarization layer (530). Specifically, the pixel electrodes (57a) may include a first pixel electrode (571) of the first light-emitting element (EL1) and a second pixel electrode (572) of the second light-emitting element (EL2). Additionally, pixel electrodes (57a) may be provided for each pixel. The pixel electrodes (57a) may be connected to the first source electrode (S1) or the first drain electrode (D1) of the first thin-film transistor (TFT1) through a contact hole penetrating the planarization layer (530).

[0120] The pixel electrode (57a) of the light-emitting element (EL) may have a single-layer structure of molybdenum (Mo), titanium (Ti), copper (Cu), or aluminum (Al), although it is not limited thereto, or a multilayer structure such as indium-tin-oxide (ITO), indium-zinc-oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), and silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), lead (Pb), gold (Au), or nickel (Ni), such as ITO / Mg, ITO / MgF, ITO / Ag, or ITO / Ag / ITO.

[0121] On the planarization layer (530), a photoreceiving electrode (57b) of the first photoelectric conversion element (PD1) and the second photoelectric conversion element (PD2) may also be disposed. Specifically, the photoreceiving electrode (57b) may include a first photoreceiving electrode (573) of the first photoelectric conversion element (PD1) and a second photoreceiving electrode (574) of the second photoelectric conversion element (PD2). A photoreceiving electrode (57b) may be provided for each photo sensor. The photoreceiving electrode (57b) may be connected to the second source electrode (S2) or the second drain electrode (D2) of the second thin-film transistor (TFT2) through a contact hole penetrating the planarization layer (530).

[0122] The photoreceiving electrode (57b) of the first photoelectric conversion element (PD1) and the second photoelectric conversion element (PD2) may have a single-layer structure of molybdenum (Mo), titanium (Ti), copper (Cu), or aluminum (Al), or a multi-layer structure of ITO / Mg, ITO / MgF, ITO / Ag, or ITO / Ag / ITO, although this is not limited thereto.

[0123] A bank layer (BK) may be disposed on the pixel electrode (57a) and the light receiving electrode (57b). The bank layer (BK) may be formed in an area overlapping with the pixel electrode (57a) to form an opening that exposes the pixel electrode (57a). The area overlapping with the exposed pixel electrode (57a), the first light-emitting layer (581), and the second light-emitting layer (582) may be defined as a light-emitting area that emits different light depending on each pixel (PX).

[0124] Additionally, the bank layer (BK) may be formed in an area overlapping with the light receiving electrode (57b) to form an opening that exposes the light receiving electrode (57b). The opening that exposes the light receiving electrode (57b) may provide a space in which the photoelectric conversion layer (58b) of each light sensor (PS) is formed.

[0125] The bank layer (BK) may include organic insulating materials such as polyacrylates resin, epoxy resin, phenolic resin, polyamides resin, polyimide resin, unsaturated polyesters resin, polyphenyleneethers resin, polyphenylenesulfides resin, or benzocyclobutene (BCB). As another example, the bank layer (BK) may include inorganic materials such as silicon nitride.

[0126] A first light-emitting layer (581) may be disposed on the first pixel electrode (571) of the first light-emitting element (EL1) exposed by the opening of the bank layer (BK). Additionally, a second light-emitting layer (582) may be disposed on the second pixel electrode (572) of the second light-emitting element (EL2). The first light-emitting layer (581) and the second light-emitting layer (582) may include a polymer material or a low-molecular-weight material and may emit red, green, or blue light for each pixel (PX). The light emitted from the first light-emitting layer (581) and the second light-emitting layer (582) may contribute to image display or function as a light source incident on a light sensor (PS). As described above, the widths of the first light-emitting layer (581) and the second light-emitting layer (582) may be substantially the same. For example, the width of the first light-emitting layer (581) of the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110) and the second light-emitting layer (582) of the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) may be the same.

[0127] When the first light-emitting layer (581) and the second light-emitting layer (582) are formed of organic material, a hole injection layer (HIL) and a hole transport layer (HTL) may be disposed below each first light-emitting layer (581) and second light-emitting layer (582), and an electron injection layer (EIL) and an electron transport layer (ETL) may be stacked above. These may be single layers or multilayers provided with organic material.

[0128] A first photoelectric conversion layer (583) may be disposed on the first photoreceiving electrode (573) of the first photoelectric conversion element (PD1) exposed by the opening of the bank layer (BK). The area where the exposed first photoreceiving electrode (573) and the first photoelectric conversion layer (583) overlap may be defined as the light detection area of ​​each fingerprint light sensor (PS1). The first photoelectric conversion layer (583) may generate photocharges in proportion to the incident light. The incident light may be light that has been emitted from the first light-emitting layer (581) and reflected back in, or it may be light provided from the outside independently of the first light-emitting layer (581). The charge generated and accumulated in the first photoelectric conversion layer (583) may be converted into an electrical signal required for sensing.

[0129] Additionally, a second photoelectric conversion layer (584) may be disposed on the second photoreceiving electrode (574) of the second photoelectric conversion element (PD2) exposed by the opening of the bank layer (BK). The area where the exposed second photoreceiving electrode (574) and the second photoelectric conversion layer (584) overlap may be defined as the light detection area of ​​each blood pressure optical sensor (PS2). The second photoelectric conversion layer (584) may generate photocharges in proportion to the incident light. The incident light may be light emitted from the second light-emitting layer (582) and reflected back in, or it may be light provided from the outside independently of the second light-emitting layer (582). The charge generated and accumulated in the second photoelectric conversion layer (584) may be converted into an electrical signal required for sensing.

[0130] The width of the second photoelectric conversion layer (584) may be greater than the width of the first photoelectric conversion layer (583). As described above, since the blood pressure optical sensor (PS2) must receive more light than the fingerprint optical sensor (PS1), the area of ​​the second photoelectric conversion layer (584) may be greater than the area of ​​the first photoelectric conversion layer (583). Accordingly, the width of the second photoelectric conversion layer (584) may be at least 1.5 times the width of the first photoelectric conversion layer (583).

[0131] The first photoelectric conversion layer (583) and the second photoelectric conversion layer (584) may include an electron donor material and an electron acceptor material. The electron donor material may generate a donor ion in response to light, and the electron acceptor material may generate an acceptor ion in response to light. When the first photoelectric conversion layer (583) and the second photoelectric conversion layer (584) are formed of organic materials, the electron donor material may include compounds such as subphthalocyanine (SubPc) and dibutylphosphate (DBP), but is not limited thereto. The electron acceptor material may include compounds such as fullerene, fullerene derivatives, and perylene diimide, but is not limited thereto.

[0132] In contrast, when the first photoelectric conversion layer (583) and the second photoelectric conversion layer (584) are formed of inorganic materials, the first photoelectric conversion element (PD1) and the second photoelectric conversion element (PD2) may be pn-type or pin-type phototransistors. For example, the first photoelectric conversion layer (583) and the second photoelectric conversion layer (584) may have a structure in which an N-type semiconductor layer, an I-type semiconductor layer, and a P-type semiconductor layer are sequentially stacked.

[0133] When the first photoelectric conversion layer (583) and the second photoelectric conversion layer (584) are formed of organic material, a hole injection layer (HIL) and a hole transport layer (HTL) may be disposed below the first photoelectric conversion layer (583) and the second photoelectric conversion layer (584), and an electron injection layer (EIL) and an electron transport layer (ETL) may be stacked above. These may be single layers or multilayers provided with organic material.

[0134] A common electrode (590) may be disposed on the first light-emitting layer (581) and the second light-emitting layer (582), the first photoelectric conversion layer (583), the second photoelectric conversion layer (584), and the bank layer (BK). The common electrode (590) may be disposed across a plurality of pixels (PX) and a plurality of light sensors (PS) in a manner that covers the first light-emitting layer (581) and the second light-emitting layer (582), the first photoelectric conversion layer (583), the second photoelectric conversion layer (584), and the bank layer (BK). The common electrode (590) may include a conductive material with a low work function, for example, Li, Ca, LiF / Ca, LiF / Al, Al, Mg, Ag, Pt, Pd, Ni, Au, Nd, Ir, Cr, BaF, Ba, or a compound or mixture thereof (for example, a mixture of Ag and Mg, etc.). Alternatively, it may include transparent metal oxides, for example, indium-tin-oxide (ITO), indium-zinc-oxide (IZO), zinc oxide (ZnO), etc.

[0135] Although not limited thereto, a common electrode (590) may be commonly disposed on the first light-emitting layer (581), the second light-emitting layer (582), the first photoelectric conversion layer (583), and the second photoelectric conversion layer (584). In this case, the cathode electrodes of the first light-emitting element (EL1) and the second light-emitting element (EL2) and the sensing cathode electrodes of the first photoelectric conversion element (PD1) and the second photoelectric conversion element (PD2) may be electrically connected. For example, a common voltage wiring connected to the cathode electrodes of the first light-emitting element (EL1) and the second light-emitting element (EL2) may be simultaneously connected to the sensing cathode electrodes of the first photoelectric conversion element (PD1) and the second photoelectric conversion element (PD2).

[0136] An encapsulation layer (TFEL) may be disposed on top of the light-emitting element layer (EML). The encapsulation layer (TFEL) may include at least one inorganic film to prevent oxygen or moisture from penetrating into each of the first light-emitting layer (581), the second light-emitting layer (582), the first photoelectric conversion layer (583), and the second photoelectric conversion layer (584). Additionally, the encapsulation layer (TFEL) may include at least one organic film to protect each of the first light-emitting layer (581), the second light-emitting layer (582), the first photoelectric conversion layer (583), and the second photoelectric conversion layer (584) from foreign substances such as dust. For example, the encapsulation layer (TFEL) may be formed in a structure in which the first inorganic film (611), the organic film (612), and the second inorganic film (613) are sequentially stacked. The first inorganic film (611) and the second inorganic film (613) may be formed as a multilayer film in which one or more inorganic films selected from silicon nitride layer, silicon oxynitride layer, silicon oxide layer, titanium oxide layer, and aluminum oxide layer are alternately stacked. The organic film (612) may be an organic film such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, or polyimide resin.

[0137] A pressure sensing layer (PRS) may be disposed on top of the encapsulation layer (TFEL). The pressure sensing layer (PRS) may be provided in the form of a panel or film and may be attached to the encapsulation layer (TFEL) through a bonding layer such as a PSA. The pressure sensing layer (PRS) may be transparent as it is located in the light emission path of the display layer.

[0138] The pressure sensing layer (PRS) serves to detect pressure applied to the display device (1). When a user or others touch the upper surface of the display device (1), the pressure applied by the touch input can be detected by the pressure sensing layer (PRS). The pressure sensing electrode of the pressure sensing layer (PRS) can be formed directly on the upper surface of the touch layer (not shown). In this case, the pressure sensing layer (PRS) can be embedded within the display panel (10) together with the display layer and the touch layer (not shown).

[0139] A window (WDL) may be placed on top of the pressure sensing layer (PRS). The window (WDL) may be placed on top of the display device (1) after the display cell (100) has undergone the cutting process and the module process to protect the configuration of the display device (1). The window (WDL) may be made of glass or plastic.

[0140] In the present embodiment, the amount of light received by the light sensor (PS) is different in each of the fingerprint measurement area (110) for detecting fingerprints and the blood pressure measurement area (120) for measuring blood pressure. Accordingly, by arranging a plurality of light sensors (PS) with different areas in each of the fingerprint measurement area (110) and the blood pressure measurement area (120), a display device (1) capable of fingerprint measurement and blood pressure measurement can be provided.

[0141] FIG. 13 is a planar arrangement of pixels and light sensors of a display panel of another embodiment. FIG. 14 is a schematic diagram comparing the planar shape of pixels according to another embodiment. FIG. 15 is a schematic diagram comparing the cross-sectional shape of pixels according to another embodiment.

[0142] The embodiments of FIGS. 13 to 15 are substantially identical to the embodiments of FIGS. 9 to 12, except for the area of ​​the first to fourth subpixels (BPX1, BPX2, BPX3, BPX4) of the blood pressure measurement area (120), so a description thereof will be omitted.

[0143] Referring to FIG. 13, a plurality of fingerprint display pixels (APX) and a plurality of fingerprint optical sensors (PS1) may be repeatedly arranged in a fingerprint measurement area (110). The plurality of fingerprint display pixels (APX) may include a first sub-fingerprint pixel (APX1), a second sub-fingerprint pixel (APX2), a third sub-fingerprint pixel (APX3), and a fourth sub-fingerprint pixel (APX4). Additionally, a plurality of blood pressure display pixels (BPX) and a plurality of blood pressure optical sensors (PS2) may be repeatedly arranged in a blood pressure measurement area (120). The plurality of blood pressure display pixels (BPX) may include a first sub-fingerprint pixel (APX1), a second sub-fingerprint pixel (APX2), a third sub-fingerprint pixel (APX3), and a fourth sub-fingerprint pixel (APX4). Since the arrangement of the fingerprint display pixels (APX) and blood pressure display pixels (BPX) is substantially the same as that of the embodiments of FIGS. 9 to 12, a description thereof will be omitted.

[0144] In FIG. 14, the dotted box at the top left illustrates the shape in which the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110) and the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) are superimposed.

[0145] Referring further to FIG. 14, the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) has a larger area than the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110). As the area of ​​the active area increases, the effective light-emitting area increases, so the maximum brightness can be increased. Therefore, even if the light-emitting layers of the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) and the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110) are made of the same material and have the same thickness, the maximum brightness of the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) can be made larger. In one embodiment, the maximum brightness of the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) may be 1.5 to 3 times the maximum brightness of the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110), and in this embodiment, the maximum brightness ratio can be satisfied by setting the area of ​​the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) to be 1.5 to 3 times that of the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110).

[0146] The planar shape of the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) is substantially the same as the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110), and the two may be similar in shape. The first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) has a fifth length (D5) and a sixth length (D6) that are both larger than the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110), and the deviation rate of the fifth length (DD5) and the deviation rate of the sixth length (DD6) may be substantially the same. However, the embodiment is not limited to the example described above, and the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) may have a different planar shape while having a larger area than the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110).

[0147] FIG. 15 illustrates a case where the thickness (T2) of the second light-emitting layer (582) of the first sub-blood pressure pixel (BPX1) in the blood pressure measurement area (120) is greater than the thickness (T1) of the first light-emitting layer (581) of the first sub-fingerprint pixel (APX1) in the fingerprint measurement area (110). As shown in FIG. 15, if the thickness (T2) of the second light-emitting layer (582) is greater than the thickness (T1) of the first light-emitting layer (581), the light-emitting volume increases, so a larger amount of light can be emitted. Therefore, even if the planar area of ​​the active area of ​​the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) and the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110) are the same and the material of the light-emitting layer is the same, the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) can emit a greater amount of light than the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110).

[0148] Additionally, although not shown in the drawing, the light-emitting material of the second light-emitting layer (582) may have a higher light-emitting efficiency than the light-emitting material of the first light-emitting layer (581). Specifically, the light-emitting material has a unique light-emitting efficiency. Some light-emitting materials have a low light-emitting efficiency (in other words, the slope of the transition section of the light-emitting brightness graph is small), while some light-emitting materials have a higher light-emitting efficiency. Also, some light-emitting materials have accurate color reproduction, whereas there are light-emitting materials that do not. If light-emitting material A has a somewhat low light-emitting efficiency but is advantageous for achieving excellent color reproduction, and light-emitting material B has a light-emitting efficiency more than twice that of light-emitting material A but has inferior color reproduction characteristics, then light-emitting material A can be applied to the first light-emitting layer (581) of the fingerprint measurement area (110) to achieve excellent image quality, and light-emitting material B can be applied to the second light-emitting layer (582) of the blood pressure measurement area (120) to achieve a maximum brightness of 1.5 to 3 times.

[0149] In the case of the present embodiment, since both the first light-emitting layer (581) and the second light-emitting layer (582) contribute to light emission, the area and light-emitting material of the first light-emitting layer (581) and the second light-emitting layer (582) can be adjusted to make the maximum brightness of the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120) greater than the maximum brightness of the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110).

[0150] In the case of this embodiment as well, the amount of light received by the light sensor (PS) is different in each of the fingerprint measurement area (110) for detecting fingerprints and the blood pressure measurement area (120) for measuring blood pressure. Accordingly, by arranging a plurality of light sensors (PS) with different areas in each of the fingerprint measurement area (110) and the blood pressure measurement area (120), a display device (1) capable of fingerprint measurement and blood pressure measurement can be provided.

[0151] In addition, measuring blood pressure requires more light than detecting fingerprints. Therefore, since the maximum brightness of the blood pressure display pixels (BPX) in the blood pressure measurement area (120) is greater than the maximum brightness of the fingerprint display pixels (APX), the accuracy of blood pressure measurement can be increased.

[0152] FIG. 16 is a planar arrangement of pixels and light sensors of a display panel of another embodiment.

[0153] The embodiment of FIG. 16 is substantially the same as the embodiment of FIG. 13 to 15, except for the arrangement of the first to third subpixels (BPX1, BPX2, BPX3) of the blood pressure measurement area (120) and the arrangement of the blood pressure optical sensor (PS2), so a description thereof will be omitted.

[0154] Referring to FIG. 16, a plurality of blood pressure display pixels (BPX) and a plurality of blood pressure optical sensors (PS2) may be repeatedly arranged in the blood pressure measurement area (120).

[0155] A plurality of blood pressure display pixels (BPX) may include a first sub-blood pressure pixel (BPX1), a second sub-blood pressure pixel (BPX2), and a third sub-blood pressure pixel (BPX3). For example, the first sub-blood pressure pixel (BPX1) may emit light of a red wavelength, the second sub-blood pressure pixel (BPX2) may emit light of a green wavelength, and the third sub-blood pressure pixel (BPX3) may emit light of a blue wavelength. Each of the plurality of blood pressure display pixels (BPX) may include a plurality of light-emitting regions that emit light. A plurality of blood pressure light sensors (PS2) may include a plurality of light-sensing regions that detect incident light.

[0156] The first sub-blood pressure pixel (BPX1), the second sub-blood pressure pixel (BPX2), and the third sub-blood pressure pixel (BPX3) and a plurality of blood pressure optical sensors (PS2) may be alternately arranged in a first direction (X) and a second direction (Y). In one embodiment, the first sub-blood pressure pixel (BPX1) and the third sub-blood pressure pixel (BPX3) may be alternately arranged to form a first row along the first direction (X), and the second row adjacent thereto may have the second sub-blood pressure pixel (BPX2) and the blood pressure optical sensor (PS2) repeatedly arranged along the first direction (X). Pixels (PX) belonging to the first row may be arranged in an alternating manner in the first direction (X) with respect to pixels (PX) belonging to the second row. The arrangement of the first row and the second row may be repeated up to the nth row.

[0157] In other words, the first sub-blood pressure pixel (BPX1) and the blood pressure optical sensor (PS2) are arranged in a first diagonal direction (DR1) that intersects the first direction (X) and the second direction (Y), and the second sub-blood pressure pixel (BPX2) and the third sub-blood pressure pixel (BPX3) can be arranged in the first diagonal direction (DR1). The second sub-blood pressure pixel (BPX2) and the third sub-blood pressure pixel (BPX3) are arranged in a second diagonal direction (DR2) that intersects the first diagonal direction (DR1), and the first sub-blood pressure pixel (BPX1) and the blood pressure optical sensor (PS2) can be arranged in the second diagonal direction (DR2). The first diagonal direction (DR1) is a direction that is obliquely inclined between the first direction (X) and the second direction (Y), and the second diagonal direction (DR2) can be a direction that is orthogonal to the first diagonal direction (DR1). For example, the first diagonal direction (DR1) may be a direction inclined at 45° with respect to the first direction (X) and the second direction (Y), but is not limited thereto.

[0158] As described above, the area of ​​the blood pressure optical sensor (PS2) may be larger than the area of ​​the fingerprint optical sensor (PS1). A description regarding this will be omitted.

[0159] Due to the arrangement position and planar shape of the first sub-blood pressure pixel (BPX1), the second sub-blood pressure pixel (BPX2), the third sub-blood pressure pixel (BPX3), and the blood pressure optical sensor (PS2), the distance (F12) between the center (C1) of the first sub-blood pressure pixel (BPX1) and the center (E2) of the second sub-blood pressure pixel (BPX2), the distance (F23) between the center (E2) of the second sub-blood pressure pixel (BPX2) and the center (E3) of the third sub-blood pressure pixel (BPX3), the distance (F14) between the center (E1) of the first sub-blood pressure pixel (BPX1) and the center (E4) of the blood pressure optical sensor (PS2), and the distance (F34) between the center (E3) of the third sub-blood pressure pixel (BPX3) and the center (E4) of the blood pressure optical sensor (PS2) may be substantially the same.

[0160] The size of the light-emitting area of ​​each blood pressure display pixel (BPX) may differ. The size of the light-emitting area of ​​the second sub-fingerprint pixel (APX2) may be smaller than the size of the light-emitting area of ​​the first sub-fingerprint pixel (APX1) or the third sub-fingerprint pixel (APX3). Although the shape of each pixel (PX) is illustrated as a rhombus, it is not limited thereto, and the shape of each pixel (PX) may be a rectangle, octagon, circle, or other polygon.

[0161] Although the shapes of the fingerprint optical sensor (PS1) and the blood pressure optical sensor (PS2) are depicted as rhombuses, as described above, they are not limited thereto. The shapes of the fingerprint optical sensor (PS1) and the blood pressure optical sensor (PS2) may be rectangular, octagonal, or other polygons.

[0162] A single blood pressure display pixel unit (BPXU) may include one first sub-blood pressure pixel (BPX1), one second sub-blood pressure pixel (BPX2), one third sub-blood pressure pixel (BPX3), and one blood pressure optical sensor (PS2). The second pixel unit (BPXU) refers to a group of color pixels capable of expressing a grayscale.

[0163] In the case of the present embodiment, the amount of light received by the light sensor (PS) is different in each of the fingerprint measurement area (110) for detecting fingerprints and the blood pressure measurement area (120) for measuring blood pressure. Accordingly, by arranging a plurality of light sensors (PS) with different areas in each of the fingerprint measurement area (110) and the blood pressure measurement area (120), a display device (1) capable of fingerprint measurement and blood pressure measurement can be provided.

[0164] Additionally, by placing a blood pressure optical sensor (PS2) at the location of the fourth sub-blood pressure pixel (BPX4) in the blood pressure measurement area (120), a larger blood pressure optical sensor (PS2) can be placed. That is, by placing a blood pressure optical sensor (PS2) with a larger area, the accuracy of blood pressure measurement can be improved.

[0165] FIG. 17 is a planar arrangement of pixels and light sensors of a display panel of another embodiment.

[0166] The display device (1) according to the present embodiment differs from previous embodiments in that the arrangement relationship of the first to fourth subpixels (BPX1, BPX2, BPX3, BPX4) of the blood pressure measurement area (120) is different.

[0167] In one embodiment, the first sub-fingerprint pixel (APX1), the second sub-fingerprint pixel (APX2), and the third sub-fingerprint pixel (APX3) of the fingerprint measurement area (110) and the fingerprint optical sensor (PS1) may be arranged alternately in a matrix. The third sub-fingerprint pixel (APX3) of the fingerprint measurement area (110) may be arranged at a predetermined interval in a first column along the second direction (Y), and the first sub-fingerprint pixel (APX1) and the second sub-fingerprint pixel (APX2) of the fingerprint measurement area (110) may be arranged alternately in a second column adjacent thereto along the second direction (Y). The arrangement of the sub-pixels may be repeated up to the nth column. A combination of the first sub-fingerprint pixel (APX1), the second sub-fingerprint pixel (APX2), and the third sub-fingerprint pixel (APX3) arranged in the fingerprint measurement area (110) may constitute a single unit pixel.

[0168] When fingerprint optical sensors (PS1) are arranged in the fingerprint measurement area (110), the third sub-fingerprint pixel (APX3) of the fingerprint measurement area (110) may be arranged at a predetermined interval in the odd-numbered columns along the second direction (Y), and the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110), the second sub-fingerprint pixel (APX2) of the fingerprint measurement area (110), and the blood pressure optical sensor (PS2) may be arranged alternately in the even-numbered columns along the second direction (Y). For example, in the second column, the first sub-fingerprint pixel (APX1) of the fingerprint measurement area (110), the second sub-fingerprint pixel (APX2) of the fingerprint measurement area (110), and the fingerprint optical sensor (PS1) may be arranged sequentially along the second direction (Y).

[0169] Additionally, the first sub-blood pressure pixel (BPX1), the second sub-blood pressure pixel (BPX2), and the third sub-blood pressure pixel (BPX3) of the blood pressure measurement area (120) and the blood pressure optical sensor (PS2) may be arranged alternately in a matrix. The third sub-fingerprint pixel (APX3) of the fingerprint measurement area (110) may be arranged at a predetermined interval in a first column along the second direction (Y), and the first sub-fingerprint pixel (APX1) and the second sub-fingerprint pixel (APX2) of the fingerprint measurement area (110) may be arranged alternately in the adjacent second column along the second direction (Y). The arrangement of the sub-pixels may be repeated up to the nth column. A combination of the first sub-blood pressure pixel (BPX1), the second sub-blood pressure pixel (BPX2), and the third sub-blood pressure pixel (BPX3) arranged in the blood pressure measurement area (120) may constitute a single unit pixel.

[0170] When blood pressure optical sensors (PS2) are arranged in a blood pressure measurement area (120), the third sub-blood pressure pixel (BPX3) of the blood pressure measurement area (120) may be arranged at a predetermined interval in the odd-numbered columns along the second direction (Y), and the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120), the second sub-blood pressure pixel (BPX2) of the blood pressure measurement area (120), and the blood pressure optical sensor (PS2) may be arranged alternately in the even-numbered columns along the second direction (Y). For example, in the second column, the first sub-blood pressure pixel (BPX1) of the blood pressure measurement area (120), the second sub-blood pressure pixel (BPX2) of the blood pressure measurement area (120), and the blood pressure optical sensor (PS2) may be arranged sequentially along the second direction (Y).

[0171] Meanwhile, the area of ​​each subpixel in the fingerprint measurement area (110) and the blood pressure measurement area (120) may differ. For example, the third subpixels (APX3, BPX3) may be larger than the first subpixels (APX1, BPX1) and the second subpixels (APX2, BPX2). The shape of each subpixel may be a planar rectangle or a square, but is not limited thereto and may be an octagon, a circle, a rhombus, or other polygon.

[0172] In the case of this embodiment as well, the area of ​​the blood pressure optical sensor (PS2) may be larger than the area of ​​the first optical sensor. Accordingly, the amount of light received by the optical sensor (PS) is different in each of the fingerprint measurement area (110) for detecting fingerprints and the blood pressure measurement area (120) for measuring blood pressure. Accordingly, by arranging a plurality of optical sensors (PS) with different areas in each of the fingerprint measurement area (110) and the blood pressure measurement area (120), a display device (1) capable of fingerprint measurement and blood pressure measurement can be provided.

[0173] FIGS. 18 and FIGS. 19 are plan views showing the area of ​​a display device according to another embodiment.

[0174] Referring to FIGS. 18 and 19, in the present embodiment, the arrangement of the blood pressure measurement area (120) and the fingerprint measurement area (110) may vary within the active area (AAR). For example, as shown in FIG. 18, the blood pressure measurement area (120) may be placed at the top of the active area (AAR), and the fingerprint measurement area (110) may be placed to surround the blood pressure measurement area (120). Alternatively, as shown in FIG. 19, the blood pressure measurement area (120) may be placed at the bottom of the active area (AAR), and the fingerprint measurement area (110) may be placed at the top of the active area (AAR). However, the arrangement of the blood pressure measurement area (120) and the fingerprint measurement area (110) is not limited to the arrangements shown in the drawings and may be freely arranged within the display area (DPA).

[0175] Although embodiments of the present invention have been described above with reference to the attached drawings, the present invention is not limited to the above embodiments and can be manufactured in various different forms, and those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical concept or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0176] 1: Display device 10: Display panel 110: Fingerprint measurement area 120: Blood pressure measurement area 50: Light detection circuit 40: Pressure sensing circuit APX: Fingerprint display pixel PBPX: Blood pressure display pixel PS1: Fingerprint optical sensor PS2: Blood pressure optical sensor

Claims

Claim 1 A display device comprising: a first region including a plurality of first pixels; a second region including a plurality of second pixels disposed adjacent to the first region; a first light sensor disposed adjacent to the plurality of first pixels in the first region and detecting light; and a second light sensor disposed adjacent to the plurality of second pixels in the second region and detecting light, wherein the area of ​​the second light sensor is different from the area of ​​the first light sensor, and the center distance between adjacent second light sensors disposed in a first direction or a second direction intersecting the first direction is the same as the center distance between first light sensors disposed adjacent to each other in the first direction or the second direction. Claim 2 A display device according to claim 1, wherein the area of ​​the second light sensor is larger than the area of ​​the first light sensor. Claim 3 A display device according to claim 2, wherein the area of ​​the second optical sensor is at least 1.5 times the area of ​​the first optical sensor. Claim 4 In claim 2, each of the plurality of first pixels comprises: a first subpixel emitting a first color; a second subpixel emitting a second color and disposed adjacent to the first subpixel in a first direction; a third subpixel emitting a third color and disposed adjacent to the second subpixel in a second direction intersecting the first direction; and a fourth subpixel emitting the second color and disposed adjacent to the second subpixel in the second direction and disposed adjacent to the third subpixel in the first direction, wherein the first light sensor is a display device disposed adjacent to the first subpixel in a first diagonal direction intersecting the first direction and the second direction. Claim 5 In claim 4, each of the plurality of second pixels comprises: a first subpixel emitting a first color; a second subpixel emitting a second color and disposed adjacent to the first subpixel in a first direction; a third subpixel emitting a third color and disposed adjacent to the second subpixel in a second direction intersecting the first direction; and a fourth subpixel emitting the second color and disposed adjacent to the second subpixel in the second direction and disposed adjacent to the third subpixel in the first direction, wherein the second light sensor is a display device disposed adjacent to the first subpixel in the first diagonal direction. Claim 6 A display device according to claim 2, wherein each of the plurality of first pixels and the plurality of second pixels comprises a first subpixel, a second subpixel, a third subpixel, and a fourth subpixel. Claim 7 A display device according to claim 6, wherein the first subpixel emits red light as a first color, the second subpixel and the fourth subpixel emit green light as a second color, and the third subpixel emits blue light as a third color. Claim 8 A display device according to claim 7, wherein the first subpixel and the third subpixel are alternately arranged in a first direction, the second subpixel and the fourth subpixel are alternately arranged in the first direction, the first subpixel and the second subpixel are alternately arranged in a second direction intersecting the first direction, and the maximum brightness of any one of the plurality of second pixels is greater than the maximum brightness of any one of the plurality of first pixels. Claim 9 A display device according to claim 8, wherein the maximum brightness of any one of the plurality of second pixels is 1.5 times or more and 3 times or less the maximum brightness of any one of the plurality of first pixels. Claim 10 A display device according to claim 8, wherein the area of ​​a first subpixel of any one of the plurality of second pixels is larger than the area of ​​a first subpixel of any one of the plurality of first pixels. Claim 11 A display device according to claim 8, wherein the thickness of the light-emitting layer of a first subpixel of any one of the plurality of second pixels is greater than the thickness of the light-emitting layer of a first subpixel of any one of the plurality of first pixels. Claim 12 A display device according to claim 8, wherein the light-emitting layer of a first subpixel of any one of the plurality of second pixels comprises a first light-emitting material, and the light-emitting layer of a first subpixel of any one of the plurality of first pixels comprises a second light-emitting material, wherein the first light-emitting material has a higher light-emitting efficiency in the sense that the external quantum efficiency is higher than that of the second light-emitting material. Claim 13 In claim 12, the second light-emitting material is a display device with high color reproduction, having higher color purity and a narrower spectrum width than the first light-emitting material for each color (red, green, blue, or white). Claim 14 In claim 2, the second region is a display device surrounded by the first region. Claim 15 In claim 4, each of the plurality of second pixels comprises: a first subpixel emitting a first color; a second subpixel emitting a second color disposed adjacent to the first subpixel in a first direction; and a third subpixel emitting a third color disposed adjacent to the second subpixel in a second direction intersecting the first direction, and the second light sensor disposed adjacent to the second subpixel in the second direction and adjacent to the third subpixel in the first direction, thereby forming a display device. Claim 16 A display device according to claim 15, wherein the maximum brightness of any one of the plurality of second pixels is greater than the maximum brightness of any one of the plurality of first pixels. Claim 17 A display device comprising: a substrate; photoreceiving electrodes spaced apart from each other on the substrate; pixel electrodes spaced apart from each other on the substrate and spaced apart from the photoreceiving electrodes; a first light-emitting layer disposed on a first pixel electrode among the pixel electrodes; a second light-emitting layer disposed on a second pixel electrode among the pixel electrodes; a first photoelectric conversion layer disposed on a first photoreceiving electrode among the photoreceiving electrodes and adjacent to the first light-emitting layer; and a second photoelectric conversion layer disposed on a second photoreceiving electrode among the photoreceiving electrodes, wherein the width of the second photoelectric conversion layer is different from the width of the first photoelectric conversion layer, and the center distance between adjacent second photoelectric conversion layers disposed in a first direction or a second direction intersecting the first direction is the same as the center distance between first photoelectric conversion layers disposed adjacent to each other in the first direction or the second direction. Claim 18 A display device according to claim 17, wherein the second light-emitting layer is adjacent to the second photoelectric conversion layer than the first photoelectric conversion layer, and the first light-emitting layer is adjacent to the first photoelectric conversion layer than the second photoelectric conversion layer. Claim 19 In claim 18, the second light-emitting layer is a display device having a maximum light-emitting brightness greater than that of the first light-emitting layer. Claim 20 In claim 18, a display device in which the width of the first light-emitting layer is greater than the width of the second light-emitting layer.

Images