Display panel inspection device for evaluating light detection characteristics

Abstract

The invention relates to a display panel inspection device. According to an embodiment disclosed, an inspection apparatus includes: a loading plate on which a display device is disposed; a reflecting plate disposed in a first direction or a second direction to face a display panel of the display device; and a light characteristic inspection control unit that controls light emission driving of the display panel and detects a light sensing signal passing through the display panel to inspect a light detection characteristic of the display panel. The light characteristic inspection control unit is configured to inspect a light detection characteristic of the display panel by converting the light sensing signal into light sensing data in units of at least one frame and comparing the light sensing data in units of at least one frame with reference frame data.

Description

Technical Field

[0001] The present disclosure relates to a display panel, and more particularly, to a display panel inspection device for evaluating light detection characteristics. Background Art

[0002] As the information society develops, the demand for display devices for displaying images is increasing in various forms. Display devices have been applied to various electronic devices such as smartphones, digital cameras, notebook computers, tablet PCs, navigation systems, and smart TVs.

[0003] Since private information is stored in portable display devices such as smartphones and tablet PCs, the portable display devices are equipped with various recognition functions and authentication functions including biometric information of a user, such as fingerprint recognition and face recognition, to protect the private information.

[0004] In addition, methods for more conveniently acquiring biometric information about health are being developed. For example, efforts are being made to combine portable display devices such as smartphones and tablet PCs with portable blood pressure measurement devices.

[0005] The portable display device may use an optical, ultrasonic or capacitive method to identify some biometric information such as a user's fingerprint. For example, when using an optical method, the portable display device detects various biometric signals such as a pulse wave signal in addition to the user's fingerprint. The optical method applied to the portable display device uses the characteristics of the amount of light reflected from the user's fingerprint to detect the characteristics of the user's fingerprint. In addition, various biometric signals such as a pulse wave signal may also be detected using changes in the amount of light reflected from various body parts other than fingers. Summary of the invention

[0006] According to a disclosed embodiment, an inspection device includes: a loading plate on which a display device is disposed; a reflective plate disposed along a first direction or a second direction to face a display panel of the display device; and a light characteristic inspection control unit that controls light emission driving of the display panel and detects a light sensing signal passing through the display panel to inspect light detection characteristics of the display panel. The light characteristic inspection control unit is configured to inspect the light detection characteristics of the display panel by converting the light sensing signal into light sensing data in units of at least one frame and comparing the light sensing data in units of at least one frame with reference frame data.

[0007] According to a disclosed embodiment, an inspection device includes: a loading plate on which a display device is arranged; a reflective plate arranged along a first direction or a second direction to face a display panel of the display device; a light characteristic inspection control unit to control the light emitting drive of the display panel and detect a light sensing signal passing through the display panel to inspect the light detection characteristics of the display panel; a plate arrangement unit to switch the arrangement direction of the reflective plate to the first direction or the second direction and arrange the reflective plate in the front direction of the display panel; and a chamber to form an internal space and create a darkroom environment in the internal space, in which the loading plate, the reflective plate and the plate arrangement unit are arranged. The light characteristic inspection control unit inspects the light detection characteristics of the display panel by converting the light sensing signal into light sensing data in units of at least one frame and comparing the light sensing data in units of at least one frame with reference frame data.

[0008] According to the disclosed embodiment, an inspection device includes: a loading plate on which a display device is arranged; a reflective plate arranged along a first direction or a second direction to face a display panel of the display device; a light characteristic inspection control unit to control the light emitting drive of the display panel and detect a light sensing signal passing through the display panel to inspect the light detection characteristics of the display panel; a plate arrangement unit to switch the arrangement direction of the reflective plate to the first direction or the second direction and arrange the reflective plate in the front direction of the display panel; and a chamber to form an internal space and create a darkroom environment in the internal space, in which the loading plate, the reflective plate and the plate arrangement unit are arranged. The reflective plate includes a flat base substrate, a first reflective layer formed on a front surface and a second reflective layer formed on a rear surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and other aspects and features of the present disclosure will become more apparent by describing in detail embodiments of the present disclosure with reference to the accompanying drawings, in which: Figure 1 is a cross-sectional structural diagram showing a display panel inspection device according to an embodiment; Figure 2 It shows that according to Figure 1 A perspective view of a display device of the embodiment shown in FIG. Figure 3 It is shown Figure 2 A plan view of the arrangement structure of the display panel and the display driving circuit shown in FIG. Figure 4 It is shown Figure 2 and Figure 3 A side view of the structure of the display device shown in FIG. Figure 5 It is schematically shown Figures 2 to 4 An example layout diagram of a display panel shown in FIG. Figure 6is a layout diagram showing a display area according to an embodiment; Figure 7 is a circuit diagram showing a display pixel and a light sensing pixel according to an embodiment; Figure 8 is a diagram showing a method according to an embodiment of the present invention. Figure 1 A cross-sectional view of a structure in which a display panel and a reflective plate of a display device are arranged along a first direction; Fig. 9 is a diagram showing a method according to an embodiment of the present invention. Figure 1 A cross-sectional view of a structure in which a display panel and a reflective plate of a display device are arranged along a first direction; Fig.10 is a diagram showing a method according to an embodiment of the present invention. Figure 1 A cross-sectional view of a structure in which a display panel and a reflective plate of a display device are arranged in a second direction; Fig.11 is a diagram showing a method according to an embodiment of the present invention. Figure 1 A cross-sectional view of a structure in which a display panel and a reflective plate of a display device shown in FIG. 1 are arranged in a second direction; Fig.12 is a flowchart sequentially illustrating a method for inspecting light detection characteristics of a display panel according to an embodiment; Fig.13 is a cross-sectional structural diagram showing a process of detecting a light sensing signal using a reflective plate arranged along a first direction; Fig.14 is a cross-sectional structural diagram showing a process of detecting a light sensing signal using a reflective plate arranged in a second direction; and Fig.15 is a view showing a method of deriving a light detection characteristic inspection result using first light sensing data and second light sensing data. DETAILED DESCRIPTION

[0010] The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings in which embodiments of the present disclosure are shown. However, the present disclosure may be implemented in different forms and should not be construed as necessarily being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art.

[0011] It will also be understood that when a layer is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. Throughout the specification, the same reference numerals refer to the same components.

[0012] It will be understood that although the terms "first", "second", etc. can be used to describe various elements here, these elements should not necessarily be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the teachings of the present disclosure, the first element discussed below can be referred to as the second element. Similarly, the second element can also be referred to as the first element.

[0013] Each of the features of the various embodiments of the present disclosure can be partially combined or fully combined or partially combined with each other or fully combined with each other, and can be technically interlocked and driven in various ways. Each embodiment can be implemented independently of each other, or can be implemented together in association.

[0014] Hereinafter, specific embodiments will be described with reference to the accompanying drawings.

[0015] Figure 1 FIG. 1 is a cross-sectional view showing a display panel inspection device according to an embodiment.

[0016] Reference Figure 1 The inspection device according to the embodiment (i.e., the display panel inspection device) includes a loading plate 20, a reflection plate 70, a plate arrangement unit 50, and a light characteristic inspection control unit 80. In addition, the inspection device according to the embodiment may further include a chamber CAM or the like, and the chamber CAM or the like may cover the loading plate 20, the reflection plate 70, and the plate arrangement unit 50, or all of the loading plate 20, the reflection plate 70, and the plate arrangement unit 50 may be disposed in the chamber CAM or the like.

[0017] For example, the chamber CAM may have an inspection space disposed inside and may be formed into a three-dimensional structure having a polygonal shape so that an internal inspection space such as a darkroom or a vacuum may be created as an inspection environment. The loading plate 20, the reflection plate 70, the plate arrangement unit 50, etc. may be disposed in the internal inspection space of the chamber CAM.

[0018] The light characteristic inspection control unit 80 may be disposed on an inner side surface or an outer surface of the chamber CAM. An opening / closing door through which the display device 10 can move into the passage may be further formed on at least one side wall surface or an upper surface of the chamber CAM. The display device 10 moves to the inside or outside of the chamber CAM through the opening / closing door, and the display device 10 is loaded on or unloaded from the loading plate 20 before and after the inspection of the light detection characteristic.

[0019] The loading plate 20 may be disposed in the inspection space inside the chamber CAM (e.g., disposed on the lower surface of the internal space of the chamber CAM). When inspecting the light detection characteristics of the display panel, the display device 10 is loaded on the loading plate 20 using a separate conveying device. For example, when inspecting the light detection characteristics of a plurality of display panels, the plurality of display devices 10 may be conveyed by a conveying device or the like and loaded on the loading plate 20. Then, when the light detection characteristics inspection of the display panel is completed, the inspected display device 10 is unloaded to the outside of the chamber CAM by the conveying device or the inspector.

[0020] When the light detection characteristics of the display panel are checked, the reflective plate 70 is disposed on the front surface of the display panel, or is disposed to face the display panel so as to be parallel to the display panel in the front side direction of the display panel. When the light detection characteristics of a plurality of display panels are checked, a large-area reflective plate 70 or a plurality of reflective plates 70 may be disposed on the front surface of the display panel or in the front side direction of the display panel.

[0021] When the reflective plate 70 completely covers the display device 10 including the display panel or is placed on the front surface of the display device 10 including the display panel, external light is blocked in the front direction of the display panel, thereby forming a dark room environment in front of the display panel. Therefore, even if a dark room environment is not established separately using a chamber CAM or the like, the effect of establishing a dark room environment can be achieved by placing the reflective plate 70 on the front surface of the display device 10 and inspecting the display device 10.

[0022] The reflective plate 70 may be disposed in a first direction such that a front surface as a surface of the reflective plate 70 faces a front surface of the display panel, or may be disposed in a second direction such that a rear surface as another surface of the reflective plate 70 overlaps a front side of the display panel.

[0023] The reflective plate 70 includes a flat base substrate, a first reflective layer formed on the front surface as the surface of the base substrate, and a second reflective layer formed on the rear surface as the upper surface. The first reflective layer and the second reflective layer have different light reflectivities. For example, the black first reflective layer can cover the entire front surface of the base substrate, and the white second reflective layer can cover the entire rear surface of the base substrate. Therefore, the reflective plate 70 can be arranged along the first direction so that the black first reflective layer faces the front surface of the display panel, or can be arranged along the second direction so that the white second reflective layer faces the front surface of the display panel.

[0024] The plate arrangement unit 50 switches the arrangement direction of the reflection plate 70 to the first direction or the second direction, and arranges the reflection plate 70 on the front surface or the front side of the display panel. The plate arrangement unit 50 may be disposed inside the chamber CAM, and the plate arrangement unit 50 may be formed as a structure of at least one mechanical arm. Different from this, the plate arrangement unit 50 may be formed as a lifting structure including a plate suction plate, a bracket, a rotating shaft, wiring, a support frame, a rolling member, a motor, etc.

[0025] The plate arrangement unit 50 supports both side surfaces or the front surface or the rear surface of the reflective plate 70, and switches the arrangement direction of the reflective plate 70 to the first direction or the second direction. In addition, the plate arrangement unit 50 arranges the reflective plate 70 on the front surface of the display panel along the first direction or the second direction. In addition, the plate arrangement unit 50 may support both side surfaces or the front surface or the rear surface of the reflective plate 70, and may arrange the reflective plate 70 in the front side direction of the display panel along the first direction or the second direction. For example, the plate arrangement unit 50 may arrange and fix the reflective plate 70 in the front side direction facing the display panel to be parallel to the display panel.

[0026] The light characteristic inspection control unit 80 supplies a driving control signal, light emission data, and a power signal to the display device 10 and drives the display panel and the display device 10 , and controls light emission driving of the display panel to detect a light sensing signal through the display panel.

[0027] For example, the light characteristic inspection control unit 80 supplies the display device 10 with a display pixel SP (see FIG. Figure 5 ) and a driving control signal of the driving timing of the light sensing pixel, the light emitting data for setting the light emitting brightness of the display pixel SP, the high potential driving voltage and the low potential driving voltage. In addition, the light characteristic inspection control unit 80 receives the light sensing signal detected by the light sensing pixel of the display panel through the display device 10.

[0028] The light characteristic inspection control unit 80 sequentially converts the light sensing signal received by the display device 10 into digital data in units of at least one frame period, and can generate light sensing data in units of at least one frame. The light characteristic inspection control unit 80 can transform the light emitting brightness of the display pixel SP in units of at least one frame period, and detect the light detection signal for each transformed light emitting brightness. Therefore, the light characteristic inspection control unit 80 inspects the light detection characteristics of the display panel such as the linear light detection characteristics and the dynamic range of the display panel by drawing (or graphing) or database-ing the light sensing data in units of at least one frame period in which the light emitting brightness is variable. In addition, the light characteristic inspection control unit 80 inspects the light detection characteristics of the display panel by comparing and analyzing the light sensing data of at least one frame with the preset reference frame data. The light characteristic inspection control unit 80 can compare and analyze the light sensing data in units of at least one frame and the reference frame data for each display device 10. Then, the light characteristic inspection control unit 80 determines the light detection characteristics of each display panel, and evaluates whether the display panel is a good product based on the analysis result.

[0029] Figure 2 It shows that according to Figure 1 A perspective view of a display device of the embodiment shown in FIG. Figure 3 It is shown Figure 2 A plan view of the arrangement structure of the display panel and the display drive circuit shown in FIG. Figure 4 It is shown Figure 2 and Figure 3 0 is a side view of the configuration of the display device shown in FIG.

[0030] First, refer to Figure 2 and Figure 3 , the display device 10 according to the embodiment can be applied to portable electronic devices such as mobile phones, smart phones, tablet personal computers (PCs), mobile communication terminals, electronic notebooks, electronic books, portable multimedia players (PMPs) navigation systems, and ultra-mobile PCs (UMPCs). In addition, the display device 10 according to the embodiment can be applied as a display unit of a television, a notebook computer, a monitor, a billboard, or an Internet of Things (IOT) device. In some embodiments, the display device 10 according to the embodiment can be applied to wearable devices such as smart watches, watch phones, glasses-type displays, and head-mounted displays (HMDs). In addition, the display device 10 according to the embodiment can be applied to a central information display (CID) set on a dashboard, a central dashboard, or a dashboard of a vehicle, an interior mirror display that replaces a side mirror of a vehicle, or a display set on the rear surface of a front seat as an entertainment device for a rear seat of a vehicle.

[0031] The display device 10 may be an organic light-emitting display device such as an organic light-emitting diode, a quantum dot light-emitting display device including a quantum dot light-emitting layer, an inorganic light-emitting display device including an inorganic semiconductor, and a micro light-emitting display device using a micro or nano light-emitting diode (micro or nano LED). Hereinafter, the display device 10 is mainly described as an organic light-emitting display device, but the present disclosure is not necessarily limited thereto.

[0032] Reference Figure 2 and Figure 4 The display device 10 includes a display panel 100, a main driving circuit 200, a pressure sensing unit PSU, a circuit board 300 and a touch driving circuit 400. The display panel 100 includes a display unit DU including a substrate SUB, a thin film transistor layer TFTL, a light emitting layer EML and an encapsulation layer TFEL, and a touch sensing unit TSU disposed on the display unit DU.

[0033] The display panel 100 may have a rectangular shape having a pair of short sides extending along a first direction DR1 and a pair of long sides extending along a second direction DR2 intersecting the first direction DR1. The corners where the short sides along the first direction DR1 and the long sides along the second direction DR2 meet may be formed as right angles, or may be rounded with a predetermined curvature. The planar shape of the display panel 100 is not necessarily limited to a quadrilateral shape, and may be formed in other shapes such as a polygonal shape, a circular shape, or an elliptical shape. The display panel 100 may be flat, but is not necessarily limited thereto. For example, the display panel 100 may include a curved surface unit formed at its left and right distal ends with a constant curvature or a variable curvature. In addition, the display panel 100 may be flexible, curved, folded, or curled.

[0034] The substrate SUB of the display panel 100 may include a main area MA and a sub area SBA.

[0035] The main area MA may include a display area DA displaying an image and a non-display area NDA which is a peripheral area of ​​the display area DA.

[0036] The non-display area NDA may be adjacent to the display area DA. The non-display area NDA may be an area outside the display area DA. The non-display area NDA may at least partially surround the display area DA. For example, the non-display area NDA may be an edge area of ​​the display panel 100.

[0037] The display area DA includes display pixels SP that display images and light sensing pixels that sense light reflected from a body part of a user, such as a face or a finger. In addition, the display area DA may further include infrared light emitting pixels that emit infrared light.

[0038] The display area DA may occupy most of the main area MA. The display area DA may be disposed at the center of the main area MA.

[0039] The display area DA may also be divided into an image display area in which light sensing pixels are not provided and only display pixels SP are provided, and a biometric information measurement area in which display pixels and light sensing pixels are mixed. For example, the light sensing pixels may be provided together with the display pixels SP only in preset cells of the biometric information measurement area instead of the entire display area DA of the display panel 100. Hereinafter, an example in which the display pixels SP and the light sensing pixels are alternately arranged in the entire area of ​​the display area DA will be described.

[0040] Reference Figure 3 and Figure 4 , the sub-region SBA may protrude from one side of the main region MA along the second direction DR2. The length of the sub-region SBA along the second direction DR2 may be less than the length of the main region MA along the second direction DR2. The length of the sub-region SBA along the first direction DR1 may be less than the length of the main region MA along the first direction DR1. In some embodiments, the length of the sub-region SBA along the first direction DR1 may be substantially the same as the length of the main region MA along the first direction DR1.

[0041] The sub-area SBA may include a first area A1, a second area A2, and a bending area BA.

[0042] The first area A1 may be an area protruding from one side of the main area MA along the second direction DR2. One side of the first area A1 may contact the non-display area NDA of the main area MA, and the other side of the first area A1 may contact the bending area BA. For example, the first area A1 may be disposed between the non-display area NDA of the main area MA and the bending area BA.

[0043] The second area A2 is an area in which a pad (also referred to as a "pad", "solder pad") DP and a main driving circuit 200 are disposed. The main driving circuit 200 may be attached to the driving pad in the second area A2 using a conductive adhesive such as an anisotropic conductive layer. The circuit board 300 may be attached to the pad DP in the second area A2 using a conductive adhesive. One side of the second area A2 may be in contact with the bending area BA.

[0044] The bending area BA is a bendable area. When the bending area BA is bent, the second area A2 may be disposed below the first area A1 and below the main area MA. The bending area BA may be disposed between the first area A1 and the second area A2. For example, one side of the bending area BA may contact the first area A1, and the other side of the bending area BA may contact the second area A2.

[0045] like Figure 4 As shown in , the sub-region SBA may be curved, and in this case, the sub-region SBA may be disposed below the main region MA. The sub-region SBA may overlap the main region MA in the third direction DR3.

[0046] A touch sensing unit TSU sensing a body part such as a finger and an electronic pen may be formed or disposed on the front of the display panel 100. The touch sensing unit TSU may include a plurality of touch electrodes sensing a user's touch in a capacitive manner.

[0047] The touch sensing unit TSU includes a plurality of touch electrodes arranged to cross each other along a first direction DR1 and a second direction DR2. For example, the plurality of touch electrodes include a plurality of drive electrodes and a plurality of sensing electrodes, the plurality of drive electrodes are arranged to be parallel to each other and spaced apart from each other along the first direction DR1, the plurality of sensing electrodes are arranged to be parallel to each other and spaced apart from each other along the second direction DR2, the plurality of sensing electrodes cross the plurality of drive electrodes, and an organic material layer or an inorganic material layer is placed between the plurality of sensing electrodes and the plurality of drive electrodes. The plurality of drive electrodes and the plurality of sensing electrodes may extend in a line region between the display pixel SP and the light sensing pixel so as not to overlap with each of the display pixel SP and the light sensing pixel arranged in the display area DA. The plurality of drive electrodes and the sensing electrodes form mutual capacitance, and transmit a touch sensing signal that changes according to the touch of the user to the touch drive circuit 400.

[0048] The touch drive circuit 400 supplies a touch drive signal to a plurality of drive electrodes and receives a touch sensing signal from a plurality of sensing electrodes. In addition, the touch drive circuit 400 senses a change in mutual capacitance between the drive electrode and the sensing electrode based on a change in the amplitude of the touch sensing signal. The touch drive circuit 400 generates touch data based on a change in mutual capacitance between the drive electrode and the sensing electrode, and derives a touch sensing position. Therefore, coordinate data of the touch sensing position can be supplied to the main drive circuit 200.

[0049] The pressure sensing unit PSU may be formed on the rear surface or the front surface of the substrate SUB and may sense pressure applied by a body part such as a finger. In some embodiments, the pressure sensing unit PSU may be formed on a surface between the display unit DU and the touch sensing unit TSU. Here, the pressure sensing unit PSU is necessary when detecting an absolute blood pressure-related measurement value, but is not necessary when detecting a relative blood pressure-related measurement value.

[0050] When forming the pressure sensing unit PSU, the pressure sensing unit PSU may be formed into a transparent sheet type in which a plurality of transparent electrodes are arranged in vertical and horizontal directions. The pressure sensing unit PSU includes a plurality of pressure sensing electrodes that intersect each other along a first direction DR1 and a second direction DR2. The plurality of pressure sensing electrodes include a plurality of lower electrodes and a plurality of upper electrodes that intersect the plurality of lower electrodes and have a transparent inorganic (or organic) material layer interposed therebetween, the plurality of lower electrodes being parallel to each other and spaced apart from each other along the first direction DR1, and the plurality of upper electrodes being parallel to each other and spaced apart from each other along the second direction DR2. The plurality of lower electrodes and the plurality of upper electrodes form a self-capacitance, and a transparent inorganic (or organic) material layer is interposed between the plurality of lower electrodes and the plurality of upper electrodes, and a pressure sensing signal that varies according to the user's touch pressure is transmitted to the touch drive circuit 400. Such a pressure sensing unit PSU may be applied in various other structures in addition to the structure using the pressure sensing electrodes, and is not necessarily limited to Figure 4 Description.

[0051] The circuit board 300 may be attached to one end of the sub-area SBA. Therefore, the circuit board 300 may be electrically connected to the display panel 100 and the main driving circuit 200. The display panel 100 and the main driving circuit 200 may receive digital video data, timing signals, and driving voltages through the circuit board 300. The circuit board 300 may be a flexible printed circuit board, a rigid printed circuit board, or a flexible film such as a chip on film.

[0052] The main driving circuit 200 may generate electrical signals such as control signals and data voltages and drive the display panel 100. Each of the main driving circuit 200 and the touch driving circuit 400 may be formed as an integrated circuit (IC) and may be attached to the display panel 100 or the circuit board 300 in a chip on glass (COG) manner, a chip on plastic (COP) manner, or an ultrasonic bonding manner, but is not necessarily limited thereto. For example, the main driving circuit 200 and the touch driving circuit 400 may also be attached to the circuit board 300 in a chip on film (COF) manner.

[0053] When inspecting and evaluating the light detection characteristics of the display panel 100 , the main driving circuit 200 receives a driving control signal, light emission data, a high potential driving voltage, a low potential driving voltage, and the like from the light characteristic inspection control unit 80 .

[0054] The main driving circuit 200 generates a control signal, and drives the display pixel SP and the light sensing pixel of the display panel 100 based on the driving timing of the driving control signal. In addition, the main driving circuit 200 generates a data voltage corresponding to the light emitting data from the light characteristic inspection control unit 80, and supplies the data voltage to the display pixel SP. The main driving circuit 200 controls the driving timing of the light sensing pixel when the display pixel SP emits light, and receives a light sensing signal from each light sensing pixel. The main driving circuit 200 sequentially supplies the light sensing signal received from each light sensing pixel to the light characteristic inspection control unit 80. Therefore, the light characteristic inspection control unit 80 can receive the light sensing signal detected from the light sensing pixel through the main driving circuit 200, and sequentially convert the light sensing signal into digital data in units of at least one frame.

[0055] Figure 5 It is schematically shown Figures 2 to 4 . Specifically, Figure 5 is a layout diagram showing a display area DA and a non-display area NDA of a display unit DU before forming a touch sensing unit TSU.

[0056] and Figure 4 Refer to Figure 5 According to an embodiment, the display scan driving unit 110, the light sensing scan driving unit 120, and the main driving circuit 200 may be provided on the display panel 100 of the display device 10. In addition, the touch driving circuit 400 and the power supply unit may be provided on the circuit board 300 connected to the display panel 100. Here, the main driving circuit 200 and the touch driving circuit 400 may be a single chip type formed integrally and may be mounted on the display panel 100 or the circuit board 300. However, hereinafter, for the convenience of explanation of the functions, an example in which the main driving circuit 200 and the touch driving circuit 400 are formed as different integrated circuits will be described.

[0057] Reference Figure 5 The display panel 100 may include display pixels SP, light sensing pixels LSP, display scan lines GL, light emission control lines VL, data lines DL, light sensing scan lines FSL, sensing reset lines REL, and light sensing lines ERL disposed in the display area DA. The display scan driving unit 110 and the light sensing scan driving unit 120 are both disposed in the non-display area NDA.

[0058] The display scan lines GL sequentially supply display scan signals applied per horizontal line from the display scan driving unit 110 to the display pixels SP and the light sensing pixels LSP for each horizontal line. The display scan lines GL may extend along a first direction DR1 and may be spaced apart from each other along a second direction DR2 crossing the first direction DR1.

[0059] The light emission control lines VL may sequentially supply the light emission control signals applied from the display scan driving unit 110 to the display pixels SP and the light sensing pixels LSP for each horizontal line in units of each horizontal line. The light emission control lines VL may extend along a first direction DR1 parallel to the display scan lines GL, and may be spaced apart from each other along a second direction DR2 crossing the first direction DR1.

[0060] The data lines DL may supply the plurality of display pixels SP with data voltages received from the main driving circuit 200. The plurality of data lines DL may extend along the second direction DR2 and may be spaced apart from each other along the first direction DR1.

[0061] The light sensing scan lines FSL sequentially supply a sensing scan signal applied from the light sensing scan driving unit 120 to a plurality of light sensing pixels LSP per horizontal line. The light sensing scan lines FSL may extend along a first direction DR1 and may be spaced apart from each other along a second direction DR2 crossing the first direction DR1.

[0062] The sensing reset line REL sequentially supplies the sensing reset signal applied from the light sensing scan driving unit 120 to the plurality of light sensing pixels LSP for each horizontal line in units of each horizontal line. The sensing reset line REL may extend in parallel with the light sensing scan line FSL along a first direction DR1 and may be spaced apart from each other along a second direction DR2 crossing the first direction DR1.

[0063] The light sensing line ERL is connected between each light sensing pixel LSP and the main driving circuit 200, and supplies a light sensing signal output from each light sensing pixel LSP to the main driving circuit 200. The light sensing lines ERL may extend along the second direction DR2 along the arrangement direction of the main driving circuit 200, and may be spaced apart from each other along the first direction DR1.

[0064] The non-display area NDA may surround the display area DA. The non-display area NDA may include a display scan driving unit 110, a light sensing scan driving unit 120, a fan-out line FOL, a gate control line GCL, and a sensing control line SCL.

[0065] The display pixels SP and the light sensing pixels LSP form respective first unit pixels and may be arranged in a matrix along the first direction DR1 and the second direction DR2 in the display area DA. When at least one infrared light emitting pixel is additionally provided in the display area DA, the display pixels SP and the at least one infrared light emitting pixel form respective second unit pixels, and the respective second unit pixels may be arranged in a matrix in the display area DA to alternate with the respective first unit pixels.

[0066] For example, three display pixels SP that display red light, green light, and blue light, respectively, and one light sensing pixel LSP may form a first unit pixel. In addition, three display pixels SP that display red light, green light, and blue light, respectively, and one infrared light emitting pixel may form a second unit pixel. The first unit pixel and the second unit pixel may be alternately arranged in a matrix form to produce horizontal or vertical stripes. In some embodiments, the first unit pixel and the second unit pixel may be alternately arranged in a zigzag shape on a plane, or may be arranged in a matrix form in an oblique direction.

[0067] Each of the red, green and blue display pixels SP and the infrared light emitting pixels can be connected to one of the display scan lines GL and one of the light emitting control lines VL. During the image display period, the red, green and blue display pixels SP can emit light by receiving the data voltage of the data line DL based on the display scan signal of the display scan line GL and the light emitting control signal of the light emitting control line VL. The image display period also includes a driving current to the light emitting device according to the data voltage. During the period of measuring biometric information such as blood pressure, heart rate, oxygen saturation and vascular elasticity, the display pixel SP displaying at least one color among red, green and blue can display light by selectively receiving the data voltage for emitting light and the display scan signal and the light emitting control signal. In addition, during the period of measuring biometric information such as blood pressure and heart rate, the infrared light emitting pixels can also display infrared light by selectively receiving the data voltage for emitting light and the display scan signal and the light emitting control signal.

[0068] The light sensing pixels LSP may be arranged in a vertical or horizontal direction and may alternate with red, green, and blue display pixels SP. Each light sensing pixel LSP may be connected to one of the light sensing scan lines FSL, one of the sensing reset lines REL, and one of the light sensing lines ERL. During a period of measuring biometric information such as blood pressure, respiratory rate, oxygen saturation, and the presence of cardiovascular disease, each light sensing pixel LSP may be reset in response to a sensing reset signal from the sensing reset line REL, and then generate and output a light sensing signal corresponding to the amount of reflected light incident from the front direction. In addition, each light sensing pixel LSP may transmit a light sensing signal to the light sensing line ERL in response to a sensing scan signal from the light sensing scan line FSL.

[0069] Meanwhile, the light sensing pixels LSP arranged in units of horizontal lines may be connected to one display scan line GL for each horizontal line. Each light sensing pixel LSP may generate a light sensing signal corresponding to the amount of reflected light incident from the front direction, and may output the light sensing signal to the light sensing line ERL in response to a display scan signal input through the display scan line GL.

[0070] The display scan driving unit 110 may be disposed in the non-display area NDA. Although the display scan driving unit 110 is shown as being disposed on one side (e.g., the left side) of the display panel 100, the display scan driving unit 110 is not necessarily limited to the drawings of this specification. For example, the display scan driving unit 110 may also be disposed on both sides (e.g., the left side and the right side) of the display panel 100.

[0071] The display scan driving unit 110 may be electrically connected to the main driving circuit 200 through the gate control line GCL. The display scan driving unit 110 receives a scan control signal from the main driving circuit 200, generates a display scan signal in units of a horizontal line driving cycle according to the scan control signal, and supplies the display scan signal to the display scan line GL. In addition, the display scan driving unit 110 may generate a light emission control signal according to the scan control signal from the main driving circuit 200, and supplies the light emission control signal to the light emission control line VL.

[0072] The gate control line GCL may extend from the main driving circuit 200 to the display scan driving unit 110, and the length of the gate control line GCL may depend on the arrangement position of the display scan driving unit 110. The gate control line GCL may supply a scan control signal received from the main driving circuit 200 to the display scan driving unit 110.

[0073] The light sensing scan driving unit 120 may be disposed in a non-display area NDA different from the display scan driving unit 110 . Figure 5 It is shown that the light sensing scanning driving unit 120 is arranged on the opposite side (for example, the right side) of the display panel 100 where the display scanning driving unit 110 is arranged, but the present disclosure is not necessarily limited to this. The light sensing scanning driving unit 120 can be electrically connected to the main driving circuit 200 through the light sensing control line SCL. The light sensing scanning driving unit 120 receives a light sensing control signal from the main driving circuit 200, and generates a reset control signal and a sensing scanning signal in units of horizontal line driving periods based on the light sensing control signal. In addition, the light sensing scanning driving unit 120 supplies the reset control signal generated sequentially to the sensing reset line REL. In addition, the light sensing scanning driving unit 120 can generate a sensing scanning signal according to the light sensing control signal from the main driving circuit 200, and supply the sensing scanning signal to the sensing scanning line FSL.

[0074] The light sensing control line SCL may extend from the main driving circuit 200 to the light sensing scan driving unit 120, and the length of the light sensing control line SCL may depend on the arrangement position of the light sensing scan driving unit 120. The light sensing control line SCL may supply a light sensing control signal received from the main driving circuit 200 to the light sensing scan driving unit 120.

[0075] The sub-area SBA may include a main driving circuit 200, a display pad area DPA, and a first touch pad area TPA1 and a second touch pad area TPA2. The display pad area DPA, the first touch pad area TPA1, and the second touch pad area TPA2 may be disposed at an edge of the sub-area SBA. The display pad area DPA, the first touch pad area TPA1, and the second touch pad area TPA2 may be electrically connected to the circuit board 300 using an anisotropic conductive layer or a low-resistance and high-reliability material such as a super absorbent polymer (SAP).

[0076] The fan-out line FOL may extend from the main driving circuit 200 to the display area DA. In addition, the fan-out line FOL may be connected to the plurality of data lines DL so that a data voltage received from the main driving circuit 200 may be supplied to the plurality of data lines DL.

[0077] The main driving circuit 200 may output a signal and a voltage to the fan-out line FOL and drive the display panel 100. The main driving circuit 200 may supply a data voltage to the data line DL through the fan-out line FOL. The data voltage may be supplied to a plurality of display pixels SP and may determine the brightness of the display pixels SP. The main driving circuit 200 may supply a scan control signal to the display scan driving unit 110 through the gate control line GCL.

[0078] The main driving circuit 200 receives a light sensing signal from the light sensing pixel LSP through the light sensing line ERL and detects a photoplethysmographic signal The photoplethysmographic signal may include a pulse wave signal corresponding to a change in amplitude of the light sensing signal among biological signals.

[0079] In addition to the pulse wave signal, the bio-signal may also include an electromyographic signal, an electroencephalogram signal, etc. However, hereinafter, an example will be described in which the main driving circuit 200 detects and analyzes the pulse wave signal among the bio-signals to measure the biometric information of the user. The biometric information of the user includes information such as blood pressure, heart rate, heart rate variability, respiratory rate, vascular elasticity, occurrence of cardiovascular disease, and oxygen saturation.

[0080] The main driving circuit 200 can sample and select the detected pulse wave signal by directing the pulse wave signal detection process to a preset application screen and analyzing the pulse wave signal, so that the pulse wave signal of the user can be accurately detected. In addition, the main driving circuit 200 measures biometric information such as blood pressure, heart rate, heart rate variability, respiratory rate, vascular elasticity, occurrence of cardiovascular disease, and oxygen saturation by analyzing the pulse wave signal in units of preset cycles. Therefore, the main driving circuit 200 can display the measurement results of biometric information such as blood pressure, heart rate, heart rate variability, respiratory rate, vascular elasticity, occurrence of cardiovascular disease, and oxygen saturation on the application screen.

[0081] Figure 6 is a diagram showing a layout of a display area according to an embodiment.

[0082] Reference Figure 6 , the display pixels SP and the light sensing pixels LSP may be disposed and included in the display area DA. In addition, the infrared light emitting pixels ISP may be further included and disposed in the display area DA.

[0083] The display pixels SP of the display area DA may be divided into first, second, and third display pixels SP1, SP2, and SP3.

[0084] The first display pixel SP1, the second display pixel SP2, the third display pixel SP3 and the light sensing pixel LSP may be defined as respective first unit pixels PG1. In addition, the first display pixel SP1, the second display pixel SP2, the third display pixel SP3 and the infrared light emitting pixel ISP may be defined as respective second unit pixels PG2.

[0085] The first unit pixel PG1 and the second unit pixel PG2 may be defined as the minimum unit of the display pixel SP capable of displaying white. Each first unit pixel PG1 may sense light. The first unit pixel PG1 and the second unit pixel PG2 may be alternately arranged in a zigzag shape on a plane, or may be arranged in a matrix form in an oblique direction. In addition, the first unit pixel PG1 and the second unit pixel PG2 may be alternately arranged on a plane in a matrix shape forming horizontal stripes or vertical stripes.

[0086] The first display pixel SP1 may include a first light emitting unit ELU1 emitting first light and a first pixel driving unit DDU1 applying a driving current to a light emitting element of the first light emitting unit ELU1. The first light may be light in a red band. For example, a main peak wavelength of the first light may be between about 600nm and 750nm.

[0087] The second display pixel SP2 may include a second light emitting unit ELU2 emitting a second light and a second pixel driving unit DDU2 applying a driving current to a light emitting element of the second light emitting unit ELU2. The second light may be light in a blue band. For example, the main peak wavelength of the second light may be between about 370nm and 460nm.

[0088] The third display pixel SP3 may include a third light emitting unit ELU3 emitting the third light and a third pixel driving unit DDU3 applying a driving current to the light emitting element of the third light emitting unit ELU3. The third light may be light in a green band. For example, the main peak wavelength of the third light may be between about 480nm and 560nm.

[0089] The infrared light emitting pixel ISP may include an infrared light emitting unit ILU emitting light in an infrared band and an infrared pixel driving unit IDU applying a driving current to a light emitting element of the infrared light emitting unit ILU. A main peak wavelength of infrared light may be between about 750nm and 1mm.

[0090] The light sensing pixel LSP includes a light sensing unit PDU and a sensing driving unit FDU.

[0091] In the first unit pixel PG1, the first pixel driving unit DDU1 to the third pixel driving unit DDU3 may be arranged in a predetermined order along the first direction DR1. In some embodiments, any one of the first pixel driving unit DDU1 to the third pixel driving unit DDU3 may also be arranged along the first direction DR1 with another adjacent pixel driving unit. In addition, the sensing driving unit FDU may be arranged along the first direction DR1 with any one of the first pixel driving unit DDU1 to the third pixel driving unit DDU3. In some embodiments, the sensing driving unit FDU may also be arranged along the second direction DR2 with any one of the first pixel driving unit DDU1 to the third pixel driving unit DDU3.

[0092] The first pixel driving units DDU1 adjacent to each other in the direction of the data line DL may be arranged along the second direction DR2. The second pixel driving units DDU2 adjacent to each other in the direction of the data line DL may be arranged along the second direction DR2. Similarly, all the sensing driving units FDU adjacent to each other in the direction of the data line DL may also be arranged along the second direction DR2.

[0093] The first light-emitting unit ELU1, the second light-emitting unit ELU2, the third light-emitting unit ELU3, the light-sensing unit PDU, and the infrared light-emitting unit ILU may have a square, an octagon, or a rhombus plane shape, but are not necessarily limited thereto. For example, the first light-emitting unit ELU1, the second light-emitting unit ELU2, the third light-emitting unit ELU3, the infrared light-emitting unit ILU, and the light-sensing unit PDU may have a polygonal plane shape other than a square, an octagon, or a rhombus.

[0094] At the same time, due to the arrangement positions and plane shapes of the first light-emitting unit ELU1, the second light-emitting unit ELU2, the third light-emitting unit ELU3 and the light-sensing unit PDU, the distance D12 between the center C1 of the first light-emitting unit ELU1 and the center C2 of the second light-emitting unit ELU2 adjacent to each other, the distance D23 between the center C2 of the second light-emitting unit ELU2 and the center C3 of the third light-emitting unit ELU3 adjacent to each other, the distance D14 between the center C1 of the first light-emitting unit ELU1 and the center C4 of the light-sensing unit PDU adjacent to each other in another direction, and the distance D34 between the center C4 of the light-sensing unit PDU and the center C3 of the third light-emitting unit ELU3 may be substantially the same.

[0095] Figure 7 is a circuit diagram showing a display pixel and a light sensing pixel according to an embodiment.

[0096] Reference Figure 7 , each display pixel SP according to the embodiment may be connected to a kth display initialization line GILk, a kth display scan line GLk, a kth display control line GCLk, and a kth light emission control line VLk. In addition, the display pixel SP may be connected to a first driving voltage line VDL supplied with a first driving voltage, a second driving voltage line VSL supplied with a second driving voltage, and a third driving voltage line VIL supplied with a third driving voltage. Hereinafter, letters k and n used instead of numbers are positive integers and may be the same number.

[0097] The display pixel SP may include a light emitting unit ELU and a pixel driving unit DDU. The light emitting unit ELU may include a light emitting element LEL. The pixel driving unit DDU may include a driving transistor DT, a switching element and a capacitor CST1. The switching element includes first to sixth transistors ST1, ST2, ST3, ST4, ST5 and ST6.

[0098] The driving transistor DT may include a gate electrode, a first electrode, and a second electrode. The driving transistor DT controls a drain-source current Ids (hereinafter referred to as a "driving current") flowing between the first electrode and the second electrode based on a data voltage applied to the gate electrode. As in Equation 1, the driving current Ids flowing through the channel of the driving transistor DT is proportional to the square of the difference between the voltage (Vsg) between the first electrode and the gate electrode of the driving transistor DT and the threshold voltage.

[0099] [Equation 1]

[0100] In Equation 1, k' is a proportionality coefficient determined by the structure and physical characteristics of the driving transistor, Vsg is a voltage between the first electrode and the gate electrode of the driving transistor, and Vth is a threshold voltage of the driving transistor.

[0101] The light emitting element LEL emits light based on the driving current Ids. For example, when the driving current Ids increases, the amount of light emitted from the light emitting element LEL may increase.

[0102] The light emitting element LEL may be an organic light emitting diode including an organic light emitting layer disposed between an anode electrode and a cathode electrode. In some embodiments, the light emitting element LEL may be an inorganic light emitting element including an inorganic semiconductor disposed between an anode electrode and a cathode electrode. In some embodiments, the light emitting element LEL may be a quantum dot light emitting element including a quantum dot light emitting layer disposed between an anode electrode and a cathode electrode. In some embodiments, the light emitting element LEL may be a micro light emitting element including a micro light emitting diode disposed between an anode electrode and a cathode electrode.

[0103] The anode electrode of the light emitting element LEL may be connected to the first electrode of the fourth transistor ST4 and the second electrode of the sixth transistor ST6 , and the cathode electrode of the light emitting element LEL may be connected to the second driving voltage line VSL. A parasitic capacitor Cel may be formed between the anode electrode and the cathode electrode of the light emitting element LEL.

[0104] The first transistor ST1 is turned on by the initialization scan signal of the kth display initialization line GILk to connect the gate electrode of the driving transistor DT to the third driving voltage line VIL. Therefore, the third driving voltage of the third driving voltage line VIL may be applied to the gate electrode of the driving transistor DT. The gate electrode of the first transistor ST1 may be connected to the kth display initialization line GILk, the first electrode of the first transistor ST1 may be connected to the gate electrode of the driving transistor DT, and the second electrode of the first transistor ST1 may be connected to the third driving voltage line VIL.

[0105] The second transistor ST2 is turned on by the display scan signal of the kth display scan line GLk, and connects the first electrode of the driving transistor DT to the data line DL. Therefore, the data voltage of the data line DL may be applied to the first electrode of the driving transistor DT. The gate electrode of the second transistor ST2 may be connected to the kth display scan line GLk, the first electrode of the second transistor ST2 may be connected to the first electrode of the driving transistor DT, and the second electrode of the second transistor ST2 may be connected to the data line DL.

[0106] The third transistor ST3 is turned on by the display scan signal of the kth display scan line GLk, and connects the gate electrode and the second electrode of the driving transistor DT to each other. When the gate electrode and the second electrode of the driving transistor DT are connected to each other, the driving transistor DT is driven as a diode. The gate electrode of the third transistor ST3 may be connected to the kth display scan line GLk, the first electrode of the third transistor ST3 may be connected to the second electrode of the driving transistor DT, and the second electrode of the third transistor ST3 may be the gate electrode of the driving transistor DT.

[0107] The fourth transistor ST4 is turned on by the display control signal of the kth display control line GCLk, and connects the anode electrode of the light emitting element LEL to the third driving voltage line VIL. The third driving voltage of the third driving voltage line VIL can be applied to the anode electrode of the light emitting element LEL. The gate electrode of the fourth transistor ST4 is connected to the kth display control line GCLk, the first electrode of the fourth transistor ST4 is connected to the anode electrode of the light emitting element LEL, and the second electrode of the fourth transistor ST4 is connected to the third driving voltage line VIL.

[0108] The fifth transistor ST5 is turned on by the light emission control signal of the k-th light emission control line VLk, and connects the first electrode of the driving transistor DT to the first driving voltage line VDL. A gate electrode of the fifth transistor ST5 is connected to the k-th light emission control line VLk, a first electrode of the fifth transistor ST5 is connected to the first driving voltage line VDL, and a second electrode of the fifth transistor ST5 is connected to the first electrode of the driving transistor DT.

[0109] The sixth transistor ST6 is disposed between the second electrode of the driving transistor DT and the anode electrode of the light emitting element LEL. The sixth transistor ST6 is turned on by the light emitting control signal of the k-th light emitting control line VLk, and connects the second electrode of the driving transistor DT to the anode electrode of the light emitting element LEL. The gate electrode of the sixth transistor ST6 is connected to the k-th light emitting control line VLk, the first electrode of the sixth transistor ST6 is connected to the second electrode of the driving transistor DT, and the second electrode of the sixth transistor ST6 is connected to the anode electrode of the light emitting element LEL.

[0110] When both the fifth transistor ST5 and the sixth transistor ST6 are turned on, a driving current Ids of the driving transistor DT based on a data voltage applied to the gate electrode of the driving transistor DT may flow to the light emitting element LEL.

[0111] The capacitor CST1 is formed between the gate electrode of the driving transistor DT and the first driving voltage line VDL. A first capacitor electrode of the capacitor CST1 may be connected to the gate electrode of the driving transistor DT, and a second capacitor electrode of the capacitor CST1 may be connected to the first driving voltage line VDL.

[0112] When the first electrode of each of the first to sixth transistors ST1, ST2, ST3, ST4, ST5 and ST6 and the driving transistor DT is a source electrode, the second electrode of each of the first to sixth transistors ST1, ST2, ST3, ST4, ST5 and ST6 and the driving transistor DT may be a drain electrode. Alternatively, when the first electrode of each of the first to sixth transistors ST1, ST2, ST3, ST4, ST5 and ST6 and the driving transistor DT is a drain electrode, the second electrode of each of the first to sixth transistors ST1, ST2, ST3, ST4, ST5 and ST6 and the driving transistor DT may be a source electrode.

[0113] The active layer of each of the first to sixth transistors ST1, ST2, ST3, ST4, ST5, and ST6 and the driving transistor DT may be formed of any one of polysilicon, amorphous silicon, and an oxide semiconductor. Figure 7 , it is mainly described that the first to sixth transistors ST1, ST2, ST3, ST4, ST5 and ST6 and the driving transistor DT are formed as P-type metal oxide semiconductor field effect transistors (MOSFETs), but the present disclosure is not necessarily limited thereto. For example, the first to sixth transistors ST1, ST2, ST3, ST4, ST5 and ST6 and the driving transistor DT may be formed as N-type MOSFETs. In some embodiments, at least one of the first to sixth transistors ST1, ST2, ST3, ST4, ST5 and ST6 and the driving transistor DT may be formed as an N-type MOSFET.

[0114] The light-sensing pixels LSP may be electrically connected to the nth sensing reset line RELn, the nth light-sensing scan line FSLn, and the nth light-sensing line RLn, respectively. Each light-sensing pixel LSP may be reset by a reset signal from the nth sensing reset line RELn, and may transmit a light-sensing signal to each nth light-sensing line RLn in response to a sensing scan signal from the nth light-sensing scan line FSLn.

[0115] The light sensing pixel LSP may be divided into a light sensing unit PDU including a light sensing element PD and a sensing driving unit FDU including first to third sensing transistors RT1 to RT3 and a sensing capacitor. Here, the sensing capacitor may be formed in a parallel structure with the light sensing element PD.

[0116] The first sensing transistor RT1 of the sensing driving unit FDU may flow a light sensing current based on the voltage of the light sensing element PD and the sensing capacitor. For example, the amount of the light sensing current may vary according to the voltage applied to the light sensing element PD and the sensing capacitor. The gate electrode of the first sensing transistor RT1 may be connected to the second electrode of the light sensing element PD. The first electrode of the first sensing transistor RT1 may be connected to a common voltage source VCOM to which a common voltage is applied. The second electrode of the first sensing transistor RT1 may be connected to the first electrode of the second sensing transistor RT2.

[0117] When a sensing scan signal of a gate-on voltage is applied to the nth light sensing scan line FSLn, the second sensing transistor RT2 may cause the sensing current of the first sensing transistor RT1 to flow through the nth light sensing line RLn. In this case, the nth light sensing line RLn may be charged with a sensing voltage by the sensing current. A gate electrode of the second sensing transistor RT2 may be connected to the nth light sensing scan line FSLn, a first electrode of the second sensing transistor RT2 may be connected to a second electrode of the first sensing transistor RT1, and a second electrode of the second sensing transistor RT2 may be connected to the nth light sensing line RLn.

[0118] When a reset signal of a gate-on voltage is applied to the nth sensing reset line RELn, the third sensing transistor RT3 may reset the voltage of the light sensing element PD and the sensing capacitor to the reset voltage of the reset voltage source VRST. A gate electrode of the third sensing transistor RT3 may be connected to the nth sensing reset line RELn, a first electrode of the third sensing transistor RT3 may be connected to the reset voltage source VRST, and a second electrode of the third sensing transistor RT3 may be connected to the second electrode of the light sensing element PD.

[0119] Despite Figure 7, it is mainly described that the first sensing transistor RT1 and the second sensing transistor RT2 are formed as P-type metal oxide semiconductor field effect transistors (MOSFETs), and the third sensing transistor RT3 is formed as an N-type MOSFET, but the embodiments of the present disclosure are not necessarily limited to this. For example, the first sensing transistor RT1, the second sensing transistor RT2, and the third sensing transistor RT3 may be optionally formed of the same or different types. In addition, one of the first electrode and the second electrode of each of the first sensing transistor RT1, the second sensing transistor RT2, and the third sensing transistor RT3 may be a source electrode, and the other of the first electrode and the second electrode of each of the first sensing transistor RT1, the second sensing transistor RT2, and the third sensing transistor RT3 may be a drain electrode.

[0120] Figure 8 is a diagram showing a method according to an embodiment of the present invention. Figure 1 0 is a cross-sectional view of a structure in which a display panel and a reflective plate of a display device are arranged along a first direction.

[0121] When inspecting the light detection characteristics of the display panel 100, the display device 10 is loaded on the loading plate 20 of the inspection device. In addition, the display device 10 is electrically connected to the light characteristic inspection control unit 80 through at least one connector and a cable.

[0122] When inspecting the light detection characteristics of the display panel 100 , the plate arrangement unit 50 of the inspection apparatus supports both side surfaces, the front surface, or the rear surface of the reflection plate 70 , and places the reflection plate 70 on the front surface of the display panel 100 .

[0123] The reflection plate 70 includes a base substrate 71, a first reflection layer 72 formed on a front surface which is one surface of the base substrate 71, and a second reflection layer 73 formed on a rear surface which is the other surface of the base substrate 71. The base substrate 71 may be disposed between the first reflection layer 72 and the second reflection layer 73.

[0124] The first reflective layer 72 and the second reflective layer 73 may have different light reflectivities. The base substrate 71 may be formed of opaque or translucent acrylic.

[0125] Here, the first reflective layer 72 may be formed to completely cover the front side direction of the base substrate 71 with a dark black color to have a light reflectivity of any one of 5% to 30%. On the other hand, the second reflective layer 73 may be formed to completely cover the rear side direction of the base substrate 71 with a bright white color to have a light reflectivity of any one of 70% to 95%.

[0126] The plate arrangement unit 50 may support both side surfaces or the front surface or the rear surface of the reflective plate 70, and may switch the arrangement direction of the reflective plate 70 to the first direction or the second direction. Therefore, the plate arrangement unit 50 arranges the reflective plate 70 along the first direction so that the first reflective layer 72 of the reflective plate 70 faces the front surface of the display panel 100, or arranges the reflective plate 70 along the second direction so that the second reflective layer 73 of the reflective plate 70 faces the front surface of the display panel 100.

[0127] When inspecting the light detection characteristics of the display panel 100 , the panel arrangement unit 50 first arranges the reflection plate 70 on the front surface of the display panel 100 along the first direction so that the first reflection layer 72 of the reflection plate 70 faces the front surface of the display panel 100 .

[0128] Fig. 9 is a diagram showing a method according to an embodiment of the present invention. Figure 1 0 is a cross-sectional view of a structure in which a display panel and a reflective plate of a display device are arranged along a first direction.

[0129] Reference Fig. 9 , when checking the light detection characteristics of the display panel 100, the board arrangement unit 50 may support both side surfaces or the front surface or the rear surface of the reflection plate 70, and may arrange the reflection plate 70 in the front side direction of the display panel 100 along the first direction or the second direction. In this case, the board arrangement unit 50 may arrange the reflection plate 70 in the first direction so that the first reflection layer 72 of the reflection plate 70 faces the front surface of the display panel 100, or arrange the reflection plate 70 in the second direction so that the second reflection layer 73 of the reflection plate 70 faces the front surface of the display panel 100, and the board arrangement unit 50 may arrange and fix the reflection plate 70 in parallel with the display panel 100 in the front side direction facing the display panel 100 while maintaining the preset gap Gp between the reflection plate 70 and the display panel 100.

[0130] When checking the light detection characteristics of the display panel 100, the board arrangement unit 50 may first arrange the reflective plate 70 along a first direction so that the first reflective layer 72 of the reflective plate 70 faces the front surface of the display panel 100, or may first arrange and fix the reflective plate 70 parallel to the display panel 100 in a front side direction facing the display panel 100 while maintaining a predetermined gap Gp.

[0131] Fig.10 is a diagram showing a method according to an embodiment of the present invention. Figure 1 0 is a cross-sectional view of a structure in which a display panel and a reflective plate of a display device are arranged along a second direction.

[0132] Reference Fig.10The board arrangement unit 50 may support two side surfaces or the front surface or the rear surface of the reflective plate 70, and may arrange the reflective plate 70 along a first direction so that the first reflective layer 72 of the reflective plate 70 faces the front surface of the display panel 100, or may arrange the reflective plate 70 along a second direction so that the second reflective layer 73 of the reflective plate 70 faces the front surface of the display panel 100.

[0133] Therefore, when checking the light detection characteristics of the display panel 100, the board arrangement unit 50 can arrange the reflective plate 70 along the second direction so that the second reflective layer 73 of the reflective plate 70 faces the front surface of the display panel 100, and the reflective plate 70 can be arranged on the front surface of the display panel 100 along the second direction.

[0134] Fig.11 is a diagram showing a method according to an embodiment of the present invention. Figure 1 , which is a cross-sectional view of a structure in which a display panel and a reflective plate of a display device are arranged in a second direction.

[0135] Reference Fig.11 , the plate arrangement unit 50 may arrange and fix the reflection plate 70 in parallel with the display panel 100 in a front direction facing the display panel 100 while maintaining a preset gap Gp.

[0136] Therefore, when checking the light detection characteristics of the display panel 100, the board arrangement unit 50 can switch the reflective plate 70 along the second direction so that the second reflective layer 73 of the reflective plate 70 faces the front surface of the display panel 100, and the reflective plate 70 switched along the second direction can be arranged and fixed parallel to the display panel 100 in the front side direction facing the display panel 100 while maintaining the preset gap Gp.

[0137] Fig.12 is a flowchart sequentially illustrating a method for inspecting light detection characteristics of a display panel according to an embodiment.

[0138] Reference Fig.12 When inspecting the light detection characteristics of the display panel 100, the display device 10 is loaded on the loading plate 20 of the inspection device. In addition, the display device 10 is electrically connected to the light characteristic inspection control unit 80 through at least one connector and a cable.

[0139] The plate arrangement unit 50 first arranges the reflection plate 70 on the front surface of the display panel 100 along the first direction so that the first reflection layer 72 of the reflection plate 70 faces the front surface of the display panel 100. Here, the plate arrangement unit 50 may also first arrange and fix the reflection plate 70 in the front side direction facing the display panel 100 while maintaining the preset gap Gp (SS1).

[0140] Fig.13is a cross-sectional structural diagram illustrating a process of detecting a light sensing signal using a reflection plate disposed along a first direction.

[0141] Reference Fig.13 When the reflective plate 70 is arranged or disposed on the front surface of the display panel 100 along the first direction, the light characteristic inspection control unit 80 supplies a driving control signal for controlling the driving timing of the display pixels SP and the light sensing pixels LSP of the display panel 100, light emitting data for setting the light emitting brightness of the display pixels SP, a high potential driving voltage, a low potential driving voltage, etc. to the main driving circuit 200 of the display device 10.

[0142] The main driving circuit 200 of the display device 10 receives a driving control signal, light emission data, a high potential driving voltage, a low potential driving voltage, and the like from the light characteristic inspection control unit 80 .

[0143] The main driving circuit 200 generates a control signal based on the driving timing of the driving control signal and drives the display pixel SP and the light sensing pixel LSP of the display panel 100. In addition, the main driving circuit 200 generates a data voltage corresponding to the light emitting data from the light characteristic inspection control unit 80, and supplies the data voltage to the display pixel SP. As shown by the arrow AA, the light emitted by the display pixel SP may be reflected by the first reflection layer 72 of the reflection plate 70 and applied to the light sensing pixel LSP. Therefore, the main driving circuit 200 controls the driving timing of the light sensing pixel LSP while the display pixel SP emits light, and receives a light sensing signal from each light sensing pixel LSP. The main driving circuit 200 sequentially supplies the light sensing signal received from each light sensing pixel LSP to the light characteristic inspection control unit 80. The light characteristic inspection control unit 80 converts the light sensing signal received by the display device 10 into digital data in units of at least one frame, and generates the first light sensing data (SS2) in units of at least one frame.

[0144] The light characteristic inspection control unit 80 can verify and inspect the light detection characteristics of the light sensing pixel LSP (such as the linear light detection characteristics and dynamic range of the light sensing pixel LSP) by drawing the first light sensing data in units of at least one frame period in which the light emission brightness is variable or database-forming the first light sensing data.

[0145] Fig.14 is a cross-sectional structural diagram illustrating a process of detecting a light sensing signal using a reflection plate disposed along a second direction.

[0146] Reference Fig.14, the plate arrangement unit 50 arranges the reflective plate 70 along the second direction so that the second reflective layer 73 of the reflective plate 70 faces the front surface of the display panel 100, and arranges the reflective plate 70 on the front surface of the display panel 100. Here, the plate arrangement unit 50 may also arrange and fix the reflective plate 70 arranged along the second direction in parallel with the display panel 100 in the front side direction facing the display panel 100 while maintaining the preset gap Gp (SS3).

[0147] When the reflective plate 70 is placed or arranged on the front surface of the display panel 100 along the second direction, the light characteristic inspection control unit 80 supplies a driving control signal, light emission data, a high potential driving voltage, a low potential driving voltage, etc. to the main driving circuit 200 of the display device 10.

[0148] The main driving circuit 200 generates a control signal based on the driving timing of the driving control signal and drives the display pixels SP and the light sensing pixels LSP of the display panel 100. In addition, the main driving circuit 200 generates a data voltage corresponding to the light emission data from the light characteristic inspection control unit 80, and supplies the data voltage to the display pixels SP. As shown by the arrow BB, the light emitted by the display pixel SP may be reflected by the second reflection layer 73 of the reflection plate 70 and applied to the light sensing pixel LSP. Therefore, the main driving circuit 200 controls the driving timing of the light sensing pixel LSP while the display pixel SP emits light and receives a light sensing signal from each light sensing pixel LSP. The main driving circuit 200 supplies the light sensing signal received from each light sensing pixel LSP to the light characteristic inspection control unit 80. The light characteristic inspection control unit 80 converts the light sensing signal received by the display device 10 into digital data in units of at least one frame, and generates second light sensing data (SS4) in units of at least one frame.

[0149] The light characteristic inspection control unit 80 can verify and inspect the light detection characteristics of the light sensing pixel LSP (such as the linear light detection characteristics and dynamic range of the light sensing pixel LSP) by drawing the second light sensing data in units of at least one frame period in which the light emission brightness is variable or database-forming the second light sensing data.

[0150] Fig.15 is a view showing a method of deriving a light detection characteristic inspection result using first light sensing data and second light sensing data.

[0151] When the reflective plate 70 is arranged along the first direction so that the front surface of the display panel 100 and the first reflective layer 72 of the reflective plate 70 face each other, the light characteristic inspection control unit 80 drives the display device 10, and converts the light sensing signal detected by the display panel 100 into digital data in units of at least one frame, and generates first light sensing data 1FR(1) to 1FR(n) in units of at least one frame.

[0152] For example, when the reflective plate 70 is arranged along the first direction so that the front surface of the display panel 100 and the first reflective layer 72 of the reflective plate 70 are opposite to each other, the light characteristic inspection control unit 80 can drive the display device 10 and generate first light sensing data 1FR(1) to 1FR(n) of the first frame to the nth frame.

[0153] In addition, when the reflective plate 70 is arranged along the second direction DR2 so that the front surface of the display panel 100 and the second reflective layer 73 of the reflective plate 70 face each other, the light characteristic inspection control unit 80 can drive the display device 10 and generate second light sensing data 2FR(1) to 2FR(n) of the first frame to the nth frame.

[0154] The light characteristic inspection control unit 80 compares the first light sensing data 1FR(1) to 1FR(n) of the first frame to the n-th frame with the second light sensing data 2FR(1) to 2FR(n) of the first frame to the n-th frame, and generates fingerprint detection data for each of the first frame to the n-th frame using the compared differential data value of each of the first frame to the n-th frame (SS5).

[0155] For example, the light characteristic inspection control unit 80 may generate fingerprint detection data (n)Frame SNR(fingerprint) for each of the first to n-th frames using Equation 2 below.

[0156] [Equation 2] (n)Frame SNR (fingerprint) = (1FR(n))-(2FR(n)) / temporal noise Here, 1FR(n) is the first light sensing data of the n-th frame, and 2FR(n) is the second light sensing data of the n-th frame. In addition, n is a positive integer.

[0157] Referring to Equation 2, the light characteristic inspection control unit 80 may detect a differential data value between first light sensing data 1FR(n) for each n-th frame detected during a period in which the reflection plate 70 is arranged along the first direction and second light sensing data 2FR(n) for each n-th frame detected during a period in which the reflection plate 70 is arranged along the second direction as fingerprint detection data (n)Frame SNR(fingerprint) for each of the first frame to the n-th frame.

[0158] The light characteristic inspection control unit 80 may compare the fingerprint detection data (n)Frame SNR(fingerprint) for each of the first to nth frames with preset reference frame data, and determine whether the display device 10 is a good product based on the comparison result (SS6).

[0159] For example, when the light characteristic inspection control unit 80 compares the fingerprint detection data (n)Frame SNR (fingerprint) for each frame from the first frame to the nth frame with the preset reference frame data, and detects that the fingerprint detection data (n)Frame SNR (fingerprint) has a data value lower than the data value of the reference frame data in frames exceeding the reference frame number (for example, 10 frames), the light characteristic inspection control unit 80 can determine that the display device 10 is a defective product.

[0160] In some embodiments, when the light characteristic inspection control unit 80 compares the average data value of the fingerprint detection data (n)Frame SNR(fingerprint) for each of the first frame to the nth frame with the average data value of the reference frame, and the number of frames whose average data value is detected to be lower than the average data value of the reference frame is detected to exceed the reference frame number (for example, 10 frames), the light characteristic inspection control unit 80 can determine that the display device 10 is a defective product.

[0161] At the same time, the light characteristic check control unit 80 can verify and check the light detection characteristics of the light sensing pixel LSP (such as the linear light detection characteristics and dynamic range of the light sensing pixel LSP) by drawing the fingerprint detection data (n)Frame SNR (fingerprint) for each frame from the first frame to the nth frame or database the fingerprint detection data (n)Frame SNR (fingerprint) for each frame from the first frame to the nth frame.

[0162] In addition, while detecting and analyzing the fingerprint detection data, the optical characteristic inspection control unit 80 generates pulse wave signal detection data (SS7) for every n-th frame by calculating an average data value of the second optical sensing data 2FR(1) to 2FR(n) for the first frame to the n-th frame and comparing and analyzing the second optical sensing data 2FR(1) to 2FR(n) with a preset standard signal value.

[0163] For example, the light characteristics inspection control unit 80 may generate the pulse wave signal detection data (n)Frame SNR (PPG) for every n-th frame using Equation 3 below.

[0164] [Equation 3] (n)Frame SNR (PPG) = Average 2FR (n) / standard signal value Here, Average 2FR(n) is an average data value of the second light sensing data 2FR(1) to 2FR(n), and the standard data value may be a preset standard signal value.

[0165] The light characteristic inspection control unit 80 can generate the pulse wave signal detection data (n) Frame SNR (PPG) for each n-th frame by calculating the average data value Average 2FR(n) of the second light sensing data 2FR(1) to 2FR(n) and a preset standard signal value (Standard Data Value) using a preset equation (e.g., Equation 3).

[0166] Thereafter, the light characteristic inspection control unit 80 may compare the pulse wave signal detection data (n)Frame SNR (PPG) for every n-th frame with preset reference frame data, and determine whether the display device 10 is a good product based on the comparison result (SS8).

[0167] For example, when the light characteristic inspection control unit 80 compares the pulse wave signal detection data (n)FrameSNR (PPG) for each n-th frame with the pre-set reference frame data, and detects that the pulse wave signal detection data (n)Frame SNR (PPG) for each n-th frame has a data value lower than the data value of the reference frame data in frames exceeding the reference frame number (for example, 10 frames), the light characteristic inspection control unit 80 can determine that the display device 10 is a defective product.

[0168] As another example, when the light characteristic inspection control unit 80 compares the average data value of the pulse wave signal detection data (n)Frame SNR (PPG) for each n-th frame with the average data value of the reference frame, and the average data value of the pulse wave signal detection data (n)Frame SNR (PPG) for each n-th frame is detected to be lower than the average data value of the reference frame, the light characteristic inspection control unit 80 determines that the display device 10 is a defective product.

[0169] At the same time, the light characteristic inspection control unit 80 can verify and check the light detection characteristics of the light sensing pixel LSP (such as the linear light detection characteristics and dynamic range of the light sensing pixel LSP) by drawing the pulse wave signal detection data (n)Frame SNR (PPG) for each n-th frame or database-forming the pulse wave signal detection data (n)Frame SNR (PPG) for each n-th frame.

[0170] As described above, the display panel inspection apparatus according to the embodiment can improve the light detection characteristic inspection speed and inspection efficiency for each display panel by simultaneously evaluating the light detection characteristic for detecting a user's fingerprint and the light detection characteristic for detecting a pulse wave signal for each display panel.

[0171] In addition, the display panel inspection device according to the embodiment can improve the accuracy and reliability of the light detection characteristic inspection result by evaluating the light detection characteristic of each display panel using the light sensing signal detection result data for each display device and even determining whether the display device is a good product.

[0172] At the conclusion of the detailed description, those skilled in the art will appreciate that numerous variations and modifications may be made to the described embodiments without substantially departing from the principles of the present disclosure.

Claims

1. An inspection device, comprising: a loading plate, on which the display device is disposed; A reflective plate, arranged along a first direction or a second direction to face the display panel of the display device; as well as a light characteristic inspection control unit that controls the light emission drive of the display panel and detects a light sensing signal passing through the display panel to inspect the light detection characteristic of the display panel, The light characteristic inspection control unit is configured to inspect the light detection characteristic of the display panel by converting a light sensing signal into light sensing data in units of at least one frame and comparing the light sensing data in units of at least one frame with reference frame data.

2. The inspection device according to claim 1, further comprising: a plate arrangement unit, which switches an arrangement direction of the reflection plate to the first direction or the second direction, and arranges the reflection plate in a front direction of the display panel; as well as A chamber forms an inner space and creates a darkroom environment in the inner space, and the loading plate, the reflecting plate and the plate arranging unit are disposed in the inner space.

3. The inspection device according to claim 2, wherein: The reflector comprises: Flat base substrate; A first reflective layer formed on a front surface which is one surface of the base substrate; and a second reflective layer formed on a rear surface which is the other surface of the base substrate, and The first reflective layer and the second reflective layer have different light reflectivities.

4. The inspection device according to claim 3, wherein: The first reflective layer entirely covers the front side direction of the base substrate with a black color having a light reflectivity between 5% and 30%, and The second reflective layer entirely covers the rear side of the base substrate in a white color with a light reflectivity between 70% and 95%.

5. The inspection device according to claim 3, wherein: The plate arrangement unit arranges the reflective plate along the first direction so that the first reflective layer of the reflective plate faces the front surface of the display panel, and by switching the arrangement direction of the reflective plate, the plate arrangement unit arranges the reflective plate along the second direction so that the second reflective layer of the reflective plate faces the front surface of the display panel.

6. The inspection device according to claim 5, wherein: the panel arrangement unit places the reflection plate on the front surface of the display panel by arranging the reflection plate along the first direction, or arranges and fixes the reflection plate in parallel with the display panel in the front side direction facing the display panel while maintaining a gap, wherein the plate arrangement unit switches the arrangement of the reflective plate along the second direction, and places the reflective plate switched along the second direction on the front surface of the display panel, or arranges and fixes the reflective plate switched along the second direction in the front direction facing the display panel to be parallel to the display panel while maintaining a gap.

7. The inspection device according to claim 5, wherein: The optical characteristic inspection control unit: configured to drive the display device in a state where the reflection plate is arranged along the first direction so that the first reflection layer of the reflection plate faces the front direction of the display panel, is configured to generate first light sensing data in units of at least one frame by converting a light sensing signal detected by the display panel into digital data in units of at least one frame, driving the display device again while arranging the reflection plate along the second direction so that the second reflection layer of the reflection plate faces the front direction of the display panel, and Second light sensing data is generated in units of at least one frame by converting a light sensing signal detected again by the display panel into digital data in units of at least one frame.

8. The inspection device according to claim 7, wherein: The light characteristic inspection control unit compares the first light sensing data and the second light sensing data for each of the first frame to the n-th frame, and generates fingerprint detection data for each of the first frame to the n-th frame using a differential data value for each of the compared first frame to the n-th frame, wherein n is a positive integer, The light characteristic inspection control unit compares the fingerprint detection data for each of the first frame to the nth frame with reference frame data, and determines whether the display device has a defect according to the comparison result.

9. The inspection device according to claim 7, wherein: The light characteristic inspection control unit generates pulse wave signal detection data for every n-th frame by calculating an average data value for the second light sensing data and comparing and analyzing the second light sensing data with a standard signal value, wherein n is a positive integer, The light characteristic inspection control unit compares the pulse wave signal detection data for each n-th frame with reference frame data, and determines whether the display device has a defect according to the comparison result.

10. An inspection device, comprising: a loading plate, on which the display device is disposed; A reflective plate, arranged along a first direction or a second direction to face the display panel of the display device; a light characteristic inspection control unit, which controls the light emission drive of the display panel and detects a light sensing signal passing through the display panel to inspect the light detection characteristic of the display panel; a plate arrangement unit, which switches an arrangement direction of the reflection plate to the first direction or the second direction, and arranges the reflection plate in a front direction of the display panel; as well as a chamber, forming an inner space and creating a darkroom environment in the inner space, wherein the loading plate, the reflecting plate and the plate arrangement unit are arranged in the inner space, The light characteristic inspection control unit inspects the light detection characteristic of the display panel by converting a light sensing signal into light sensing data in units of at least one frame and comparing the light sensing data in units of at least one frame with reference frame data.

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